CN100571005C - A kind of control method that is used for charging and discharging currents of adjuster for superconducting magnet - Google Patents

Abstract

A kind of control method that is used for charging and discharging currents of adjuster for superconducting magnet.Voltage cell (U _V) adopt the bipolarity control mode, in charge and discharge process, sustaining voltage unit (U _V) switch (S5), (S6), (S7), (S8) phase invariant, by voltage cell (U _V) variation at switch conduction angle regulates duty ratio, the size of Control current adjuster power transfer; Current unit (U _I) by voltage cell (U _V) commutation voltage that provides, the switching tube of two brachium pontis of current source converter (csc) is in the moment of commutation, give the switching tube triggering signal that to open brachium pontis earlier, the switching tube of control voltage source converter then, make it on the former limit of transformer, to produce commutation voltage, after being folded to secondary, because commutation voltage and the current opposite in direction that flows through the switching tube that will turn-off make and flow through this switching current minimizing; And because commutation voltage is identical with the sense of current that flows through the switching tube that will open, makes and flow through this switching current increase; After the electric current of waiting to flow through the switching tube that will turn-off reduces to zero, turn-off this switching tube.The present invention can reduce switching loss.

Description

A kind of control method that is used for charging and discharging currents of adjuster for superconducting magnet

Technical field:

The present invention relates to the control method of charging and discharging currents of adjuster for superconducting magnet.

Background technology:

Zero resistance that superconduction has and the big characteristic of high-intensity magnetic field download stream ability make superconducting magnet obtain using widely, particularly are used to produce the large-scale magnet of high-intensity magnetic field in high-energy physics experiment.Superconducting magnet has almost replaced the conventional magnet that all volumes are big, power consumption is many; Simultaneously, along with the development of superconducting power technology, particularly miniature superconducting energy storage, commercialization abroad is widely used in and improves the quality of power supply, raising stability of power system etc., and these all make superconducting magnet obtain unprecedented application.

The general running current of superconducting magnet is all in the kA level, and is a big inductance, and this technology of discharging and recharging to superconducting magnet has proposed new requirement.Charging and discharging currents is big, voltage is low, and charging/discharging voltage excursion stable and voltage is big, needs the switching frequency height simultaneously, power density is big and control performance good, these all are to be used for the basic demand that superconducting magnet discharges and recharges, and require more urgent especially on the miniature superconducting energy storage of commercialization.

Chinese patent 03137460.3 provides a kind of current regulator that superconducting magnet discharges and recharges that is used for, and it is made up of voltage cell, transformer unit and current unit three parts.Voltage cell is that a DC side is the voltage source converter of capacitor, current unit is the current source converter (csc) of a direct current side joint superconducting magnet, the interchange outlet side of voltage source converter links to each other with the former limit of transformer, the interchange outlet side of current source converter (csc) links to each other with the transformer secondary, wherein transformer unit can be a common transformer, also can be the transformer that a side or both sides are all the band tap.It not only can charge to magnet, the electric energy of storing in the magnet can also be discharged, and charging/discharging voltage is adjustable flexibly.Its current unit electric current is big but voltage is low, and voltage cell electric current and voltage are all little for contact capacity, this has not only reduced switching loss, can also improve switching frequency, thereby reduced the capacitor volume in the voltage cell greatly, dwindle the volume of transformer in the transformer unit, thereby improved power density and systematic function.

But patent 03137460.3 has just proposed the basic charging/discharging thereof of sort circuit adjuster, and wherein opening with the closed rigid folding that all reckons without switching tube of switch may damage and bring bigger switching loss to switching tube.The operation principle of patent 03137460.3 is as shown in Figure 2: switch S 7 closures, and when switch S 8 was opened, promptly current regulator linked to each other with DC power supply DC, and L charges to magnet.Switch S 3 and S6 closure, S4 and S5 open, the former limit L of transformer T _PBe output as the voltage of capacitor C, be positive voltage, this moment, Closing Switch S2 disconnected S1, the two ends of L2 be output as after the transformer transformation on the occasion of voltage, voltage direction determine that by end of the same name size is voltage/transformer voltage ratio of capacitor C, charges to magnet L.If switch S 3 is opened simultaneously with S6, S4 and S5, transformer T is output as zero, and the magnet both end voltage is zero, the electric current I of magnet L remains unchanged, more than be the upper half of the action of switch S 3 and S6, S4 and S5, the action of lower half is similar to upper half, repeats no more here.Switch S 8 closures, when switch S 7 was opened, promptly current regulator linked to each other with load LOAD, and L discharges to magnet.Switch S 3 and S6 closure, S4 and S5 open, the former limit L of transformer T _PBe output as the voltage of capacitor C, be positive voltage, open switch S 2 this moment, disconnect S1, the two ends of L1 be output as after the transformer transformation on the occasion of voltage (voltage direction is determined that by end of the same name size is voltage/transformer voltage ratio of capacitor C), that is to say magnet L both end voltage, it is opposite with the electric current I direction of magnet, magnet L discharge.If switch S 3 is opened simultaneously with S6, S4 and S5, transformer T is output as zero, and the magnet both end voltage is zero, and the electric current I of magnet L remains unchanged, and more than is the upper half of the action of switch S 3 and S6, S4 and S5, and the action of lower half is similar to upper half.Because the electric current that superconducting magnet is passed through is very big, from top switch motion as can be seen, the switching tube of current source converter (csc) is under the very big situation of electric current, always need to realize charging and discharge by turn on and off rigidly, this mode that discharges and recharges not only makes the switching tube of secondary bear very big switching loss, and is easy to damage switching tube.

Summary of the invention:

For overcoming the deficiencies in the prior art, the present invention proposes a kind of control method of current regulator---auxiliary electromotive force ambipolar control method, this method can realize superconducting magnet side switching tube zero-current switching in switching process, reduced the loss of switch effectively.

The present invention controls and assists the basic principle of electromotive force according to bipolarity.Bipolarity control is a kind of basic control method of DC/DC converter, it is by adjusting the ratio between interior effective time of one-period and cycle, in charge and discharge process, sustaining voltage unit switch S3, S6, S4, S5 phase invariant, duty ratio is regulated in variation by voltage cell switch conduction angle, the size of Control current adjuster power transfer.

The key of auxiliary electromotive force ambipolar control method of the present invention is auxiliary electromotive force.So-called auxiliary electromotive force, be in the switching tube of two brachium pontis of the current source converter (csc) of current unit the moment in commutation, give the switching tube triggering signal that to open brachium pontis earlier, control the switching tube of voltage cell voltage source converter then, make it on the former limit of transformer, to produce into commutation voltage, after being folded to secondary since with the current opposite in direction that flows through the switching tube that will turn-off, thereby the electric current that flows through this brachium pontis switch is reduced; And because identical with the sense of current that flows through the switching tube that will open, thereby the electric current that flows through this brachium pontis switch is increased, by the time after flowing through the electric current of the switching tube that will turn-off and reducing to zero, turn-off this switching tube again, thereby realized the shutoff of zero current.

Current regulator of the present invention is made up of voltage cell, transformer unit and current unit three parts.Voltage cell is a voltage source converter, and the DC side of voltage source converter is that two brachium pontis of capacitor and voltage source converter compose in parallel.Current unit is a current source converter (csc).

The present invention adopts ambipolar control mode to the voltage cell of current regulator: in charge and discharge process, keep the 3rd switch, the 6th switch, the 4th switch and the 5th switch phase of the voltage source converter of described voltage cell constant, duty ratio is regulated in variation by voltage cell switch conduction angle, controls the size of described current regulator power transfer; Current unit carries out commutation by the commutation voltage that voltage cell provides: commutation voltage is by the 3rd switch and the 6th switch of described voltage cell voltage source converter, or the 4th switch and the 5th switch open generation simultaneously, the switch of two brachium pontis of described current source converter (csc) is in the moment of commutation, give the switch triggering signal that to open brachium pontis earlier, when commutation voltage is the first switch triggering signal that described current source converter (csc) is given in timing, the second switch triggering signal of giving described current source converter (csc) when negative when commutation voltage, control the switch of described voltage source converter then, make it on the former limit of transformer, to produce commutation voltage, after being folded to secondary, when commutation voltage is timing, electric current flows through the second switch that will turn-off, when commutation voltage when negative, electric current flows through first switch that will turn-off, because commutation voltage and the current opposite in direction that flows through the described switch that will turn-off make and flow through this switching current minimizing; And since commutation voltage with flow through the described switch that will open: first switch, or the sense of current of second switch is identical makes and flows through this switching current and increase; By the time flow through the described switch that will turn-off: the electric current of the second switch or first switch turn-offs the second switch or first switch after reducing to zero again.

The present invention mainly contains following two characteristics:

(1) can satisfy the basic function that current regulator discharges and recharges;

(2) the present invention is to provide a kind of mode of control, do not relate to the change on the circuit structure that does not also need to provide extra, and as long as just can realize zero-current switching by the signal that turns on and off that changes switching tube.

The present invention not only can satisfy the basic function that current regulator discharges and recharges, and greatly reduces switching loss, has improved the stability of system, further perfect systematic function.

Description of drawings:

Fig. 1 is the main circuit circuit of patent 03137460.3.U _IBe current unit, U _TTransformer unit, U _VVoltage cell, S1, S2, S3, S4, S5, S6, S7 and S8 are switch, and DC is a DC power supply, and LOAD is load, the C capacitor, the tapped transformer of T subcarrier band, * indication transformer end of the same name, L are superconducting magnet, the I magnet current;

Fig. 2 is the main circuit schematic diagram of patent 03137460.3.S1, S2, S3, S4, S5, S6, S7 and S8 are switch, and DC is a DC power supply, and LOAD is load, C capacitor, L _PBe the former limit that transformer T is connected with voltage cell, L1, L2 are respectively two windings of the secondary that transformer T is connected with current unit, and * indication transformer end of the same name, L are superconducting magnet, the I magnet current;

The specific embodiment 1 that Fig. 3 is amplified out for patent 03137460.3, the line map of the current regulator of the neither band tap of the former secondary of transformer.U _IBe current unit, U _TTransformer unit, U _VVoltage cell, T1, T2, T3, T4, T5, T6, T7, T8 are insulation gate pole bipolar transistor IGBT, D1, D2, D3, D4 are respectively the diode that is in series with the gate pole bipolar transistor IGBT T1 that insulate, T2, T3, T4, S1 and S2 are switch, and DC is a DC power supply, and LOAD is load, the C capacitor, the transformer of the neither band tap of the former secondary of T, * indication transformer end of the same name, L are superconducting magnet;

The specific embodiment 2 that Fig. 4 is amplified out for patent 03137460.3, wherein G1, G2, G3, G4 are thyristor, T5, T6, T7, T8 are IGBT, S1 and S2 are switch, and DC is a DC power supply, and LOAD is load, C is a capacitor, the transformer of the neither band tap of the former secondary of T, * indication transformer end of the same name, L are superconducting magnet;

The specific embodiment 3 that Fig. 5 is amplified out for patent 03137460.3: the line map of the current regulator of transformer subcarrier band tap.U _IBe current unit, U _TTransformer unit, U _VVoltage cell, T1, T2, T3, T4, T5, T6 and D1, D2, D3, D4, D5, D6 are respectively insulation gate pole bipolar transistor IGBT and reach and its diode connected in parallel, D11, D21 are respectively the diode that is in series with insulate gate pole bipolar transistor IGBT T1, T2, S1 and S2 are switch, and DC is a DC power supply, and LOAD is load, the C capacitor, the tapped transformer of T subcarrier band, * indication transformer end of the same name, L are superconducting magnet;

The specific embodiment 4 that Fig. 6 is amplified out for patent 03137460.3: the line map of the current regulator of transformer subcarrier band tap.U _IBe current unit, U _TTransformer unit, U _VVoltage cell, T3, T4, T5, T6 and D3, D4, D5, D6 are respectively insulation gate pole bipolar transistor IGBT and reach and its diode connected in parallel, G1, G2 are thyristor, S1 and S2 are switch, and DC is a DC power supply, and LOAD is load, the C capacitor, the tapped transformer of T subcarrier band, * indication transformer end of the same name, L are superconducting magnet;

The schematic diagram of the auxiliary electromotive force twin-stage charging control mode that Fig. 7 is provided for embodiment shown in Figure 31 for the present invention;

The schematic diagram of the auxiliary electromotive force twin-stage discharge control mode that Fig. 8 is provided for embodiment shown in Figure 31 for the present invention;

The schematic diagram of the auxiliary electromotive force twin-stage charging control mode that Fig. 9 is provided for embodiment shown in Figure 42 for the present invention;

The schematic diagram of the auxiliary electromotive force twin-stage discharge control mode that Figure 10 is provided for embodiment shown in Figure 42 for the present invention;

Embodiment:

Below in conjunction with the drawings and specific embodiments the present invention is further described:

Fig. 2 is the main circuit schematic diagram of patent 03137460.3.

As shown in Figure 2, patent 03137460.3 is by voltage cell U _I, transformer unit U _T, with current unit U _VThree parts are formed.Transformer unit U _TTransformer for the side band tap that links to each other with current unit.Voltage cell U _VOne DC side is that two brachium pontis of capacitor C and voltage source converter compose in parallel, and a brachium pontis of voltage source converter is composed in series by the 3rd switch S 3 and the 4th switch S 4, the 5th switch S 5 and the 6th switch S 6; The mid point of two brachium pontis of voltage source converter, promptly the interchange outlet side of voltage source converter links to each other with the former limit of transformer T.Current unit U _IIt is a current source converter (csc), its DC side one end is connected in the centre tap of transformer T secondary, the other end is connected with second switch S2 with first switch S 1, and the opposite side of first switch S 1 and second switch S2 is connected with two terminals up and down of transformer T secondary respectively; The DC side of current source converter (csc) is connected with superconducting magnet L, and the dc bus capacitor device C of voltage source converter with close S7 and DC power supply DC, octavo by minion respectively and close S8 and the load LOAD branch road of forming that is in series and be connected in parallel.

L wherein _PThe former limit that indication transformer T is connected with voltage cell, secondary first winding L 1, secondary second winding L 2 be two windings of the secondary that is connected with current unit of indication transformer T respectively, * indication transformer end of the same name.

Below in conjunction with Fig. 2 the auxiliary ambipolar control method of electromotive force is explained.

As shown in Figure 2, minion is closed the S7 closure, and when octavo pass S8 opened, promptly current regulator linked to each other with DC power supply DC, and L charges to magnet.Specific as follows: the voltage cell U of current regulator _VDc terminal capacitor C link to each other with DC power supply DC, provide voltage or energy by the latter.When the 3rd switch S 3 that will form voltage source converter respectively and the 6th switch S 6, the 4th switch S 4 and the 5th switch S 5 were alternately cut-off, the interchange outlet side of voltage source converter promptly was the former limit L of transformer T _PBe ac square wave, the secondary of transformer, promptly the two ends of secondary first winding L 1, secondary second winding L 2 are output as ac square wave, and this moment, first switch S 1 and the second switch S2 of current source converter (csc) worked in rectification state, gave magnet L charging.The big I of magnet L two ends charging voltage is recently regulated by the 3rd switch S 3 of regulation voltage source converter and the duty of the 6th switch S 6, the 4th switch S 4 and the 5th switch S 5.Logical relation is as follows: the 3rd switch S 3 and the 6th switch S 6 closures, the 4th switch S 4 and the 5th switch S 5 are opened, the former limit L of transformer T _PBe output as the voltage of capacitor C, be positive voltage, at this moment closed first switch S 1, the two ends of secondary first winding L 1 be output as after the transformer transformation on the occasion of voltage, voltage direction determines by end of the same name, size be the voltage of capacitor C divided by transformer voltage ratio, give magnet L charging.If the 3rd switch S 3 and the 6th switch S 6, the 4th switch S 4 and the 5th switch S 5 are opened simultaneously, transformer T is output as zero, magnet L both end voltage is zero, the electric current I of magnet L remains unchanged, and more than is the upper half of the action of the 3rd switch S 3 and the 6th switch S 6, the 4th switch S 4 and the 5th switch S 5; When the 4th switch S 4 and the 5th switch S 5 closures, the 3rd switch S 3 and the 6th switch S 6 are opened, the former limit L of transformer T _PBe output as the reverse voltage of capacitor C, be negative voltage, this moment closed second switch S2, the two ends of secondary second winding L 2 are output as the negative value voltage after the transformer transformation, voltage direction is determined by end of the same name, size be the voltage of capacitor C divided by transformer voltage ratio, magnet L both end voltage is opposite with the both end voltage direction of secondary second winding L 2, its value of equal and opposite in direction still is positive.Voltage after the transformer transformation is identical with the upper half of the action of the 3rd switch S 3 and the 6th switch S 6, the 4th switch S 4 and the 5th switch S 5, gives magnet L charging; If the 3rd switch S 3 and the 6th switch S 6, the 4th switch S 4 and the 5th switch S 5 are opened simultaneously, transformer T is output as zero, the magnet both end voltage is zero, the electric current I of magnet L remains unchanged, this is similar to the upper half of the action of the 5th switch S 5 to the 3rd switch S 3 and the 6th switch S 6, the 4th switch S 4, is the 3rd switch S 3 and the lower half of the action of S6, the 4th switch S 4 and the 5th switch S 5.By regulating the duty ratio in half cycle of the 3rd switch S 3 and the 6th switch S 6 and the 4th switch S 4 and the 5th switch S 5, the average voltage at scalable magnet L two ends, the i.e. charging voltage of flexible magnet L.

Octavo is closed the S8 closure, and when minion pass S7 opened, promptly current regulator linked to each other with load LOAD, and L discharges to magnet.Specific as follows: the voltage cell U of current regulator _IThe initial value of dc terminal capacitor C can be given by DC power supply DC.When the 3rd switch S 3 that will form voltage source converter respectively and the 6th switch S 6, the 4th switch S 4 and the 5th switch S 5 are cut-off, the interchange outlet side of voltage source converter, the i.e. former limit L of transformer T _PBe ac square wave, the secondary of transformer, promptly the two ends of secondary first winding L 1, secondary second winding L 2 are output as ac square wave, and this moment, first switch S 1 and the second switch S2 of current source converter (csc) worked in inverter mode, gave magnet L discharge.If the electric current I direction of magnet L as shown in Figure 2.The switching logic relation is as follows: first switch S 1 and second switch S2 closure, superconducting magnet L electric current are by first switch S 1 and second switch S2 afterflow, and neither charging is not discharged yet.The 3rd switch S 3 and the 6th switch S 6 closures, the 4th switch S 4 and the 5th switch S 5 are opened, the former limit L of transformer T _PBe output as the forward voltage of capacitor C, be positive voltage, the two ends of secondary first winding L 1 and secondary second winding L 2 be output as after the transformer transformation on the occasion of voltage, the voltage direction of secondary second winding L 2 with flow through its current opposite in direction, thereby the electric current that flows through second switch S2 is reduced; The voltage of secondary first winding L 1 is identical with the electric current that flows through it, thereby the electric current that flows through it is increased.Reduce to zero when the electric current of the second switch S2 that flows through, open second switch S2, thereby realized zero-current switching, and then make the 4th switch S 4 and the 5th switch S 5 closures, the 3rd switch S 3 and the 6th switch S 6 are opened, the former limit L of transformer T _PBe output as the voltage of capacitor C, be negative voltage, the two ends of secondary first winding L 1 are output as negative value voltage after the transformer transformation, and (voltage direction is determined by end of the same name, size is that the voltage of capacitor C is divided by transformer voltage ratio), that is to say magnet L both end voltage, it is opposite with the electric current I direction of magnet L, magnet L discharge.If first switch S 1 is all closed with second switch S2, the magnet both end voltage is zero, the electric current I of magnet L remains unchanged, and more than is the upper half of the action of first switch S 1 and second switch S2, the 3rd switch S 3 and the 6th switch S 6, the 4th switch S 4 and the 5th switch S 5; Closed second switch S2 makes the 4th switch S 4 and the 5th switch S 5 closures then, and the 3rd switch S 3 and the 6th switch S 6 are opened, the former limit L of transformer T _PBe output as the reverse voltage of capacitor C, be negative voltage, the two ends of secondary first winding L 1, secondary second winding L 2 are output as the negative value voltage after the transformer transformation, and the voltage direction of secondary second winding L 2 is identical with the sense of current that flows through it, thereby the electric current that flows through second switch S2 is increased; The voltage of secondary first winding L 1 with flow through its opposite current, thereby the electric current that flows through first switch S 1 is reduced.Reduce to zero when the electric current of first switch S 1 of flowing through, open first switch S 1, thereby realized zero-current switching.Make the 3rd switch S 3 and the 6th switch S 6 closures then, the 4th switch S 4 and the 5th switch S 5 are opened, the former limit L of transformer T _PBe output as the forward voltage of capacitor C, be positive voltage, the two ends of secondary second winding L 2 be output as after the transformer transformation on the occasion of voltage, voltage direction is identical with the direction of end decision of the same name, size is that the voltage of capacitor C is divided by transformer voltage ratio, that is to say magnet L both end voltage, it is opposite with the electric current I direction of magnet, magnet L discharge.If first switch S 1 is all closed with second switch S2, magnet L both end voltage is zero, the electric current I of magnet L remains unchanged, and more than is the lower half of the action of first switch S 1 and second switch S2, the 3rd switch S 3 and the 6th switch S 6, the 4th switch S 4 and the 5th switch S 5.By regulating first switch S 1 and second switch S2, the duty ratio in half cycle of the 3rd switch S 3 and the 6th switch S 6 and the 4th switch S 4 and the 5th switch S 5, the average voltage at scalable magnet L two ends, the i.e. discharge voltage of flexible magnet L.

The embodiment 1 that Fig. 3 is amplified out for patent 03137460.3.Transformer unit U _TCommon transformer for the neither band tap of former secondary.Voltage cell U _VBe a voltage source converter, voltage source converter is composed in series voltage cell (U by a brachium pontis by pentasyllabic quatrain edge gate pole bipolar transistor IGBT T5 and four-line poem with seven characters to a line edge gate pole bipolar transistor IGBT T7 _V) another brachium pontis be composed in series by the 6th insulation gate pole bipolar transistor IGBT T6 and the 8th insulation gate pole bipolar transistor IGBT T8; Two brachium pontis of voltage source converter and capacitor C compose in parallel the voltage cell U of current regulator _VOne DC side; The mid point of described two brachium pontis, promptly the interchange outlet side of voltage source converter links to each other with the former limit of transformer T.Current unit U _IIt is a current source converter (csc), be composed in series brachium pontis of current source converter (csc) by first diode D1 of the first insulation gate pole bipolar transistor IGBT T1 and series connection with it and the 3rd diode D3 of the 3rd insulation gate pole bipolar transistor IGBT T3 and series connection with it, form another brachium pontis of current source converter (csc) by second diode D2 of the second insulation gate pole bipolar transistor IGBT T2 and series connection with it and the 4th diode D4 of the 4th insulation gate pole bipolar transistor IGBT T4 and series connection with it; Be connected in parallel on the DC side of current source converter (csc) after two brachium pontis parallel connections of current source converter (csc) with superconducting magnet L.The mid point of two brachium pontis of current source converter (csc), promptly the interchange outlet side of current source converter (csc) links to each other with transformer T secondary; The DC side of current source converter (csc) is connected with superconducting magnet L, and the dc bus capacitor device C of voltage source converter be connected in parallel by first switch S 1 and DC power supply DC, second switch S2 and the load LOAD branch road of forming that is in series respectively.Wherein DC power supply DC is the controlled rectification bridge.Insulation gate pole bipolar transistor IGBT T ₁, T ₂, T ₃, T ₄, T ₅, T ₆, T ₇With T ₈Can also be gate level turn-off thyristor GTO, field of electric force effect transistor MOSFET or other active electric power electronic device or superconducting switch, transformer T can be conventional transformer or superconducting transformer, switch S ₁, S ₂Can be solid-state switch or electric switch.

The embodiment 2 that Fig. 4 is amplified out for patent 03137460.3.Transformer unit U _TCommon transformer for the neither band tap of former secondary.Voltage cell U _VDC side be that two brachium pontis of capacitor C and voltage source converter compose in parallel; Voltage source converter brachium pontis is composed in series voltage cell U by pentasyllabic quatrain edge gate pole bipolar transistor IGBT T5 and four-line poem with seven characters to a line edge gate pole bipolar transistor IGBT T7 respectively _VAnother brachium pontis be composed in series by the 6th insulation gate pole bipolar transistor IGBT T6 and the 8th insulation gate pole bipolar transistor IGBT T8; The mid point of two brachium pontis, promptly the interchange outlet side of voltage source converter links to each other with the former limit of transformer T.Current unit U _IIt is a current source converter (csc), the first thyristor G1 and the 3rd thyristor G3 are composed in series a brachium pontis of current source converter (csc), the second thyristor G2 and the 4th thyristor G4 are composed in series another brachium pontis of current source converter (csc), and superconducting magnet L and two brachium pontis compose in parallel the DC side of current source converter (csc); The mid point of two brachium pontis, promptly the interchange outlet side of current source converter (csc) links to each other with transformer T secondary; The DC side of current source converter (csc) is connected with superconducting magnet L, and the dc bus capacitor device C of voltage source converter be connected in parallel by first switch S 1 and DC power supply DC, second switch S2 and the load LOAD branch road of forming that is in series respectively.Wherein DC side DC is the controlled rectification bridge.Insulation gate pole bipolar transistor IGBT T ₅, T ₆, T ₇With T ₈Can also be gate level turn-off thyristor GTO, field of electric force effect transistor MOSFET or other active electric power electronic device or superconducting switch, transformer T can be conventional transformer or superconducting transformer, switch S ₁, S ₂Can be solid-state switch or electric switch.

Fig. 5 is the embodiment 3 that goes out during patent 03137460.3 is drawn.Transformer unit U _TTransformer for the subcarrier band tap that links to each other with current unit.Voltage cell U _VIt is a voltage source converter, a brachium pontis of voltage source converter is composed in series by the 3rd insulation gate pole bipolar transistor IGBT T3 and the 4th insulation gate pole bipolar transistor IGBT T4, and another brachium pontis of voltage source converter is composed in series by pentasyllabic quatrain edge gate pole bipolar transistor IGBT T5 and the 6th insulation gate pole bipolar transistor IGBT T6; The DC side of voltage source converter is that capacitor C and described two brachium pontis compose in parallel; The mid point of two brachium pontis of voltage source converter, promptly the interchange outlet side of voltage source converter links to each other with the former limit of transformer T.Current unit U _IBe a current source converter (csc), its DC side one end is connected in the centre tap of transformer T secondary, and the other end connects a side of two brachium pontis of current source converter (csc); The opposite side of two brachium pontis of current source converter (csc) is connected with two terminals up and down of transformer T secondary; A brachium pontis of current source converter (csc) is composed in series by the first insulation gate pole bipolar transistor IGBT T1 and the 11 diode D11, and another brachium pontis of current source converter (csc) is composed in series by the second insulation gate pole bipolar transistor IGBT T2 and the 21 diode D21; The DC side of current source converter (csc) is connected with superconducting magnet L, and the dc bus capacitor device C of voltage source converter be connected in parallel by first switch S 1 and DC power supply DC, second switch S2 and the load LOAD branch road of forming that is in series respectively.Wherein DC side DC is the controlled rectification bridge.Insulation gate pole bipolar transistor IGBT T ₁, T ₂, T ₃, T ₄, T5 and T6 can also be gate level turn-off thyristor GTO, field of electric force effect transistor MOSFET or other active electric power electronic device or superconducting switch, transformer T can be conventional transformer or superconducting transformer, switch S ₁, S ₂Can be solid-state switch or electric switch.

The embodiment 4 that Fig. 6 is amplified out for patent 03137460.3.Transformer unit U _TFor with current unit U _IThe transformer T of the subcarrier band tap that links to each other.Voltage cell U _VDC side is that two brachium pontis of capacitor C and voltage source converter compose in parallel; A brachium pontis of voltage source converter is composed in series by the 3rd insulation gate pole bipolar transistor IGBT T3 and the 4th insulation gate pole bipolar transistor IGBT T4, pentasyllabic quatrain edge gate pole bipolar transistor IGBT T5 and the 6th insulation gate pole bipolar transistor IGBT T6; The mid point of two brachium pontis of voltage source converter that is to say that the interchange outlet side of voltage source converter links to each other with the former limit of transformer T.Current unit U _IBe a current source converter (csc), its DC side one end is connected in the centre tap of transformer T secondary, and the other end connects the brachium pontis that is composed in series by the first thyristor G1 and the second thyristor G2, and the opposite side of this brachium pontis is connected with two terminals up and down of transformer T secondary; The DC side of current source converter (csc) is connected with superconducting magnet L, and the dc bus capacitor device C of voltage source converter be connected in parallel by first switch S 1 and DC power supply DC, second switch S2 and the load LOAD branch road of forming that is in series respectively.Wherein DC side DC is the controlled rectification bridge.Insulation gate pole bipolar transistor IGBT T ₃, T ₄, T5 and T6 can also be gate level turn-off thyristor GTO, field of electric force effect transistor MOSFET or other active electric power electronic device or superconducting switch, transformer T can be conventional transformer or superconducting transformer, switch S ₁, S ₂Can be solid-state switch or electric switch.

The schematic diagram of Fig. 7 charging control mode that to be the present invention provided for the example 1 of Fig. 3.

The action logic relation of switching device is as follows: switch S 1 closure, when switch S 2 was opened, L charged to magnet.IGBT T1, T2, T3 and T4 are permanent closed when charging, carry out rectification by D1, D2, D3 and D4.Insulation gate pole bipolar transistor IGBT T5 and T8 closure, T6 and T7 open, and the transformer secondary bears malleation, and by diode D2 and D3 magnet is charged.The electric current of diode D2 and D3 of flowing through increases, and the electric current of diode D1 and D4 reduces.Finally, the electric current of diode D1 and D4 reduces to zero.Then, insulation gate pole bipolar transistor IGBT T5 and T8 open, and the electric current of diode D1 and D4 increases gradually, the electric current of diode D2 and D3 reduces gradually, both equate that finally magnet does not charge and also do not discharge by two brachium pontis afterflows in parallel of current source converter (csc).It more than is the upper half of the action of insulation gate pole bipolar transistor IGBT T5, T6, T7, T8; Insulation gate pole bipolar transistor IGBT T6 and T7 closure, T5 and T8 open, and the transformer secondary bears malleation, and by diode D1 and D4 magnet is charged.The electric current of diode D1 and D4 of flowing through increases, and the electric current of diode D2 and D3 reduces.Finally, the electric current of diode D2 and D3 reduces to zero.Then, insulation gate pole bipolar transistor IGBT T6 and T7 open, and the electric current of diode D2 and D3 increases gradually, and the electric current of diode D1 and D4 reduces gradually, and both equate that finally magnet does not fill and do not put by two brachium pontis afterflows in parallel of current source converter (csc).It more than is the lower half of the action of insulation gate pole bipolar transistor IGBT T5, T6, T7, T8.

To be the present invention be the discharge control mode schematic diagram that the example 1 of Fig. 3 is provided to Fig. 8.

The action logic relation of switching device is as follows: second switch S2 closure, when first switch S 1 was opened, L discharged to magnet.If the electric current I direction of magnet as shown in Figure 1, if insulation gate pole bipolar transistor IGBT T1, T2, T3 and T4 are all closed, the electric current I that this moment, superconducting magnet flow through is carried out afterflow by two brachium pontis in parallel, and neither charging is not discharged yet.This moment is if make insulation gate pole bipolar transistor IGBT T5 and T8 closure, T6 and T7 open, the electric current that then flows through T2 and T3 increases, the electric current of T1 and T4 reduces, when the electric current of insulation gate pole bipolar transistor IGBT T1 and T4 reduces to zero fully, turn-off insulation gate pole bipolar transistor IGBT T1 and T4, thereby realized the shutoff of zero current, insulation gate pole bipolar transistor IGBT T1 and T4 close and have no progeny, turn-off insulation gate pole bipolar transistor IGBT T5 and T8 again, this moment, the inverse parallel parasitic diode by insulation gate pole bipolar transistor IGBT T6 and T7 discharged.Here it is, and auxiliary electromotive force is realized the method for zero current commutation.After discharge a period of time, if closed insulation gate pole bipolar transistor IGBT T1 and T4, owing to bear the positive pressure drop that the magnet discharge causes on insulation gate pole bipolar transistor IGBT T1 and the T4, so insulation gate pole bipolar transistor IGBT T1 and T4 are open-minded naturally, magnet afterflow on two brachium pontis, neither charging is not discharged yet.It more than is the upper half of insulation gate pole bipolar transistor IGBT T5, T6, T7 and T8 action; Connect half cycle, insulation gate pole bipolar transistor IGBT T1, T2, T3 and T4 are all closed, if insulation gate pole bipolar transistor IGBT T6 and T7 closure, insulation gate pole bipolar transistor IGBT T5 and T8 open, the electric current that then flows through insulation gate pole bipolar transistor IGBT T1 and T4 increases, the electric current of insulation gate pole bipolar transistor IGBT T2 and T3 reduces, when the electric current of insulation gate pole bipolar transistor IGBT T2 and T3 reduces to zero fully, turn-off insulation gate pole bipolar transistor IGBT T2 and T3, thereby realized the shutoff of zero current, insulation gate pole bipolar transistor IGBT T2 and T3 close and have no progeny, turn-off insulation gate pole bipolar transistor IGBT T6 and T7 again, this moment, the inverse parallel parasitic diode by insulation gate pole bipolar transistor IGBT T5 and T8 discharged.Thereby realized the zero current commutation.After discharge a period of time, if closed insulation gate pole bipolar transistor IGBT T2 and T3, owing to bear the positive pressure drop that the magnet discharge causes on insulation gate pole bipolar transistor IGBT T2 and the T3, so insulation gate pole bipolar transistor IGBT T2 and T3 are open-minded naturally, magnet afterflow on two brachium pontis of current source converter (csc), neither charging is not discharged yet.

To be the present invention be the charging control mode schematic diagram that the example 2 of Fig. 4 is provided to Fig. 9, and the action logic relation of switching device is described with regard to this schematic diagram below.The action logic relation of switching device is as follows: first switch S, 1 closure, when second switch S2 opened, L charged to magnet.At first give thyristor G2 and G3 triggering signal, make insulation gate pole bipolar transistor IGBT T5 and T8 closure then, insulation gate pole bipolar transistor IGBT T6 and T7 open, and the transformer secondary bears malleation, make thyristor G2 and G3 conducting, and magnet is charged by thyristor G2 and G3.The electric current of thyristor G2 and G3 of flowing through increases, and the electric current of thyristor G1 and G4 reduces.Finally, the electric current of thyristor G1 and G4 reduces to zero.Treat that thyristor G2 and G3 conducting recession removes triggering signal.Before insulation gate pole bipolar transistor IGBT T5 and the arrival of T8 trigger impulse trailing edge, trigger thyristor G1 and G4, when trailing edge arrives, it is open-minded naturally because thyristor G1 and G4 bear forward voltage, the electric current that superconducting magnet flows through is by two brachium pontis afterflows in parallel of current source converter (csc), enter neither charging, the state that does not discharge again.It more than is the action upper half of switching tube; Connect half cycle, give thyristor G1 and G4 triggering signal this moment under the afterflow state, this moment, thyristor is conducting originally, can not add triggering signal here by hypothesis, but to be on the safe side, prevent that previous moment from effectively not triggering, so added triggering signal to thyristor.Make insulation gate pole bipolar transistor IGBT T6 and T7 closure then, insulation gate pole bipolar transistor TGBT T5 and T8 open, and the transformer secondary bears negative pressure, makes thyristor G1 and G4 conducting, and by thyristor G1 and G4 magnet is charged.The electric current of thyristor G1 and G4 of flowing through increases, and the electric current of thyristor G2 and G3 reduces.Finally, the electric current of thyristor G2 and G3 reduces to zero.Treat that thyristor G1 and G4 conducting recession removes triggering signal.Before insulation gate pole bipolar transistor IGBT T6 and the arrival of T7 trigger impulse trailing edge, trigger thyristor G2 and G3, when trailing edge arrives, it is open-minded naturally because thyristor G2 and G3 bear forward voltage, the electric current that superconducting magnet flows through is by two brachium pontis afterflows in parallel of current source converter (csc), enter neither charging, the state that does not discharge again.

To be the present invention be the discharge control mode schematic diagram that the example 2 of Fig. 4 is provided to Figure 10, and the action logic relation of switching device is described with regard to this schematic diagram below.The action logic relation of switching device is as follows: switch S 2 closures, when switch S 1 was opened, L discharged to magnet.If the electric current I direction of magnet as shown in Figure 1, at first, give thyristor G2 and G3 triggering signal, this moment is if make insulation gate pole bipolar transistor IGBT T5 and T8 closure, insulation gate pole bipolar transistor IGBT T6 and T7 open, the electric current that then flows through thyristor G2 and G3 increases, the electric current of thyristor G1 and G4 reduces, when the electric current of thyristor G1 and G4 reduces to zero fully, thyristor G1 and G4 zero-crossing switching, thyristor G1 and G4 close and have no progeny, and turn-off T5 and T8 again, and this moment, the inverse parallel parasitic diode by T6 and T7 discharged.Here it is, and auxiliary electromotive force is realized the method for zero current commutation.After discharge a period of time, give thyristor G1 and G4 trigger impulse, owing to bear the positive pressure drop that magnet L discharge causes on thyristor G1 and the G4, so thyristor G1 and G4 are open-minded naturally, magnet current afterflow on two brachium pontis of current source converter (csc), neither charging is not discharged yet.More than be thyristor G1, G2, G3 and G4, the upper half of the action of insulation gate pole bipolar transistor IGBT T5, T6, T7 and T8; Connect half cycle, thyristor G1, G2, G3 and G4 afterflow conducting, in order to prevent to flow through thyristor G1, the electric current of G4 reduces to zero, thyristor G1, the G4 triggering signal does not remove this moment yet, make insulation gate pole bipolar transistor IGBT T6 and T7 closure then, insulation gate pole bipolar transistor IGBT T5 and T8 open, the electric current that then flows through thyristor G1 and G4 increases, the electric current of thyristor G2 and G3 reduces, when the electric current of thyristor G2 and G3 reduces to zero fully, thyristor G2 and G3 zero-crossing switching, thyristor G2 and G3 close and have no progeny, remove the triggering signal of thyristor G1 and G4, turn-off insulation gate pole bipolar transistor IGBT T6 and T7 again, this moment, the inverse parallel parasitic diode by insulation gate pole bipolar transistor IGBT T5 and T8 discharged.Thereby realized the zero current commutation.After discharge a period of time, if give thyristor G2 and G3 triggering signal, owing to bear the positive pressure drop that magnet L discharge causes on thyristor G2 and the G3, so thyristor G2 and G3 are open-minded naturally, magnet afterflow on two brachium pontis of current source converter (csc), neither charging is not discharged yet.

The present invention to the control principle of example shown in Figure 53 with identical with example 1, identical to the control principle of example shown in Figure 64 with example 2.

Claims (4)

1, a kind of control method that is used for charging and discharging currents of adjuster for superconducting magnet, described current regulator is by voltage cell (U _I), transformer unit (U _T), with current unit (U _V) three parts composition; Voltage cell (U _V) be a voltage source converter, the DC side of voltage source converter is that two brachium pontis of capacitor (C) and voltage source converter compose in parallel; Current unit (U _I) be a current source converter (csc), it is characterized in that voltage cell (U to current regulator _V) adopt ambipolar control mode: in charge and discharge process, keep described voltage cell (U _V) the 3rd switch (S3), the 6th switch (S6), the 4th switch (S4) and the 5th switch (S5) phase invariant of voltage source converter, by voltage cell (U _V) variation at switch conduction angle regulates duty ratio, controls the size of described current regulator power transfer; Current unit (U _I) by voltage cell (U _V) commutation voltage that provides carries out commutation: commutation voltage is by described voltage cell (U _V) the 3rd switch (S3) and the 6th switch (S6) of voltage source converter, or the 4th switch (S4) and the 5th switch (S5) open generation simultaneously, the switch of two brachium pontis of described current source converter (csc) is in the moment of commutation, give the switch triggering signal that to open brachium pontis earlier, when commutation voltage is first switch (S1) triggering signal that described current source converter (csc) is given in timing, second switch (S2) triggering signal of giving described current source converter (csc) when negative when commutation voltage, control the switch of described voltage source converter then, make it on the former limit of transformer (T), to produce commutation voltage, after being folded to secondary, when commutation voltage is timing, electric current flows through the second switch (S2) that will turn-off, when commutation voltage when negative, electric current flows through first switch (S1) that will turn-off, because commutation voltage and the current opposite in direction that flows through the described switch that will turn-off make and flow through this switching current minimizing; And since commutation voltage with flow through the described switch that will open: first switch (S1), or the sense of current of second switch (S2) is identical makes and flows through this switching current and increase; By the time flow through the described switch that will turn-off: the electric current of second switch (S2) or first switch (S1) turn-offs second switch (S2) or first switch (S1) after reducing to zero again.

2, according to the control method of the described current regulator of claim 1, it is characterized in that: the structure of current regulator as described in (1) time, to its control method as described in (2):

(1) transformer unit (U of current regulator _T) be and current unit (U _I) transformer (T) of the side band tap that links to each other; Voltage cell (U _V) DC side is a capacitor (C) and two brachium pontis of voltage source converter compose in parallel, a brachium pontis of described voltage source converter is composed in series by the 3rd switch (S3) and the 4th switch (S4), and another brachium pontis of voltage source converter is composed in series by the 5th switch (S5) and the 6th switch (S6); The mid point of two brachium pontis of voltage source converter, promptly the interchange outlet side of voltage source converter links to each other with the former limit of transformer (T); Current unit (U _I) be a current source converter (csc), DC side one end of current source converter (csc) is connected in the centre tap of transformer (T) secondary, current source converter (csc) is made up of first switch (S1) and second switch (S2), first switch (S1) and second switch (S2) side interconnect, constitute another DC side of current source converter (csc), the opposite side of first switch (S1) and second switch (S2) is connected with two terminals up and down of transformer (T) secondary respectively; The DC side of current source converter (csc) is connected with superconducting magnet (L), the dc bus capacitor device (C) of described voltage source converter with close (S7) and DC power supply (DC), octavo by minion respectively and close (S8) and load (LOAD) branch road of forming that is in series and be connected in parallel;

(2) minions are closed (S7) closure, and octavo is closed (S8) when opening, and promptly current regulator links to each other with DC power supply (DC), and are to magnet (L) charging, specific as follows: when forming described voltage cell (U respectively _V) the 3rd switch (S3) and the 6th switch (S6), the 4th switch (S4) and the 5th switch (S5) of voltage source converter be when alternately cut-offfing, the interchange outlet side of voltage source converter, the i.e. former limit (L of transformer (T) _P) be ac square wave, the secondary of transformer (T), the two ends that are secondary first winding (L1) and secondary second winding (L2) are output as ac square wave, and this moment, first switch (S1) and the second switch (S2) of current source converter (csc) worked in rectification state, give magnet (L) charging; The big I of magnet (L) two ends charging voltage is recently regulated with the duty of the 5th switch (S5) with the 6th switch (S6), the 4th switch (S4) by the 3rd switch (S3) of regulation voltage source converter, logical relation is as follows: the 3rd switch (S3) and the 6th switch (S6) closure, the 4th switch (S4) is opened the former limit (L of transformer (T) with the 5th switch (S5) _P) be output as the voltage of capacitor (C), be positive voltage, this moment closed first switch (S1), the two ends of secondary first winding (L1) be output as after the transformer transformation on the occasion of voltage, voltage direction is determined by end of the same name, size be the voltage of capacitor (C) divided by transformer voltage ratio, give magnet (L) charging; If the 3rd switch (S3) is opened with the 5th switch (S5) simultaneously with the 6th switch (S6), the 4th switch (S4), transformer (T) is output as zero, magnet (L) both end voltage is zero, the electric current (I) of magnet (L) remains unchanged, and more than is the upper half of the action of the 3rd switch (S3) and the 6th switch (S6), the 4th switch (S4) and the 5th switch (S5); When the 4th switch (S4) and the 5th switch (S5) closure, the 3rd switch (S3) is opened the former limit (L of transformer (T) with the 6th switch (S6) _P) be output as the reverse voltage of capacitor (C), be negative voltage, this moment closed second switch (S2), the two ends of secondary second winding (L2) are output as the negative value voltage after the transformer transformation, voltage direction is determined by end of the same name, size be the voltage of capacitor (C) divided by transformer voltage ratio, magnet (L) both end voltage is opposite with the both end voltage direction of secondary second winding (L2), its value of equal and opposite in direction is still for just; If the 3rd switch (S3) is opened with the 5th switch (S5) simultaneously with the 6th switch (S6), the 4th switch (S4), transformer (T) is output as zero, the magnet both end voltage is zero, the electric current (I) of magnet (L) remains unchanged, this is similar to the upper half of the action of the 5th switch (S5) to the 3rd switch (S3) and the 6th switch (S6), the 4th switch (S4), is the 3rd switch (S3) and the 6th switch (S6), the 4th switch (S4) lower half with the action of the 5th switch (S5); By regulating the duty ratio in half cycle of the 3rd switch (S3) and the 6th switch (S6) and the 4th switch (S4) and the 5th switch (S5), the average voltage at scalable magnet (L) two ends, the charging voltage of promptly regulating magnet (L);

Octavo is closed (S8) closure, and minion is closed (S7) when opening, and promptly current regulator links to each other with load (LOAD), and is to magnet (L) discharge, specific as follows: the voltage cell (U of current regulator _I) the initial value of dc terminal capacitor (C) can be given by DC power supply (DC); When the 3rd switch (S3) that will form voltage source converter respectively and the 6th switch (S6), the 4th switch (S4) and the 5th switch (S5) when cut-offfing, the interchange outlet side of voltage source converter, the i.e. former limit (L of transformer (T) _P) be ac square wave, the secondary of transformer (T), the two ends that are secondary first winding (L1) and secondary second winding (L2) are output as ac square wave, this moment, first switch (S1), the second switch (S2) of electric current converter worked in inverter mode, give magnet (L) discharge, the switching logic relation is as follows: first switch (S1) and second switch (S2) closure, and superconducting magnet (L) electric current is by first switch (S1) and second switch (S2) afterflow, neither charging is not discharged yet; The 3rd switch (S3) and the 6th switch (S6) closure, the 4th switch (S4) and the 5th switch (S5) are opened, the former limit (L of transformer (T) _P) be output as the forward voltage of capacitor (C), be positive voltage, the two ends of secondary first winding (L1), secondary second winding (L2) be output as after the transformer transformation on the occasion of voltage, the voltage direction of secondary second winding (L2) with flow through its current opposite in direction, thereby the electric current that flows through second switch (S2) is reduced; The voltage of secondary first winding (L1) is identical with the electric current that flows through it, thereby the electric current that flows through it is increased; When the electric current of the second switch of flowing through (S2) reduces to zero, open second switch (S2), realized zero-current switching, and then make the 4th switch (S4) and the 5th switch (S5) closure, the 3rd switch (S3) is opened the former limit (L of transformer (T) with the 6th switch (S6) _P) be output as the voltage of capacitor (C), be negative voltage, the two ends of secondary first winding (L1) are output as the negative value voltage after the transformer transformation, it is magnet (L) both end voltage, voltage direction is determined by end of the same name, size be the voltage of capacitor (C) divided by transformer voltage ratio, magnet (L) both end voltage is opposite with electric current (I) direction of magnet (L), magnet (L) discharge; If first switch (S1) is all closed with second switch (S2), magnet (L) both end voltage is zero, the electric current (I) of magnet (L) remains unchanged, and more than is the upper half of the action of first switch (S1) and second switch (S2), the 3rd switch (S3) and the 6th switch (S6), the 4th switch (S4) and the 5th switch (S5); Closed second switch (S2) makes the 4th switch (S4) and the 5th switch (S5) closure then, and the 3rd switch (S3) is opened the former limit (L of transformer (T) with the 6th switch (S6) _P) be output as the reverse voltage of capacitor (C), be negative voltage, the two ends of secondary first winding (L1) and secondary second winding (L2) are output as the negative value voltage after the transformer transformation, the voltage direction of secondary second winding (L2) is identical with the sense of current that flows through it, thereby the electric current that flows through second switch (S2) is increased; The voltage of secondary first winding (L1) with flow through its opposite current, thereby the electric current that flows through first switch (S1) is reduced; Reduce to zero when the electric current of first switch (S1) of flowing through, open first switch (S1), realized zero-current switching; Make the 3rd switch (S3) and the 6th switch (S6) closure then, the 4th switch (S4) is opened the former limit (L of transformer (T) with the 5th switch (S5) _P) be output as the forward voltage of capacitor (C), be positive voltage, the two ends of secondary second winding (L2) be output as after the transformer transformation on the occasion of voltage, voltage direction is identical with the direction of end decision of the same name, size is that the voltage of capacitor (C) is divided by transformer voltage ratio, be magnet (L) both end voltage, it is opposite with electric current (I) direction of magnet (L), magnet (L) discharge; If first switch (S1) is all closed with second switch (S2), magnet (L) both end voltage is zero, the electric current (I) of magnet (L) remains unchanged, and more than is the lower half of the action of first switch (S1) and second switch (S2), the 3rd switch (S3) and the 6th switch (S6), the 4th switch (S4) and the 5th switch (S5); By regulating first switch (S1) and second switch (S2), the duty ratio in half cycle of the 3rd switch (S3) and the 6th switch (S6) and the 4th switch (S4) and the 5th switch (S5), the average voltage at scalable magnet (L) two ends is promptly regulated the discharge voltage of magnet (L).

3, a kind of control method that is used for charging and discharging currents of adjuster for superconducting magnet, described current regulator is by voltage cell (U _I), transformer unit (U _T), with current unit (U _V) three parts composition; Voltage cell (U _V) be a voltage source converter, the DC side of voltage source converter is that two brachium pontis of capacitor (C) and voltage source converter compose in parallel; Current unit (U _I) be a current source converter (csc), transformer unit (U _T) be and current unit (U _I) link to each other not with the transformer (T) of band tap, the structure that it is characterized in that described current regulator as described in (3) time, to its control method as described in (4):

(3) described voltage source converter brachium pontis is composed in series by pentasyllabic quatrain edge gate pole bipolar transistor IGBT (T5) and four-line poem with seven characters to a line edge gate pole bipolar transistor IGBT (T7), and another brachium pontis of voltage source converter is composed in series by the 6th insulation gate pole bipolar transistor IGBT (T6) and the 8th insulation gate pole bipolar transistor IGBT (T8); The mid point of two brachium pontis of voltage source converter, promptly the interchange outlet side of voltage source converter links to each other with the former limit of transformer (T); First diode (D1) of the first insulation gate pole bipolar transistor IGBT (T1) and series connection with it is composed in series current unit (U with the 3rd diode (D3) of the 3rd insulation gate pole bipolar transistor IGBT (T3) and series connection with it _I) a brachium pontis, the 4th diode (D4) composition current unit (U of second diode (D2) of second insulation gate pole bipolar transistor IGBT (T2) and series connection with it and the 4th insulation gate pole bipolar transistor IGBT (T4) and series connection with it _I) another brachium pontis, current unit (U _I) two brachium pontis parallel connections after be connected in parallel on the DC side of current source converter (csc) with superconducting magnet (L); Current unit (U _I) mid point of two brachium pontis, promptly the interchange outlet side of current source converter (csc) links to each other with transformer (T) secondary; The DC side of current source converter (csc) is connected with superconducting magnet (L), and the dc bus capacitor device (C) of voltage source converter be connected in parallel by first switch (S1) and DC power supply (DC), second switch (S2) and load (LOAD) branch road of forming that is in series respectively;

(4) when first switch (S1) closure that is connected with DC power supply (DC), the second switch (S2) that is connected with load (LOAD) is when opening, magnet (L) is charged: the first insulation gate pole bipolar transistor IGBT (T1), the second insulation gate pole bipolar transistor IGBT (T2), the 3rd insulation gate pole bipolar transistor IGBT (T3) and the 4th insulation gate pole bipolar transistor IGBT (T4) are permanent closed when charging, by first diode (D1), second diode (D2), the 3rd diode (D3) and the 4th diode (D4) carry out rectification, pentasyllabic quatrain edge gate pole bipolar transistor IGBT (T5) and the 8th insulation gate pole bipolar transistor IGBT (T8) closure, the 6th insulation gate pole bipolar transistor IGBT (T6) is opened with four-line poem with seven characters to a line edge gate pole bipolar transistor IGBT (T7), transformer (T) secondary bears malleation, and by second diode (D2) and the 3rd diode (D3) magnet is charged; The electric current of second diode (D2) and the 3rd diode (D3) of flowing through increases, and the electric current of first diode (D1) and the 4th diode (D4) reduces, and is final, and it is zero that the electric current of first diode (D1) and the 4th diode (D4) reduces to; Then, pentasyllabic quatrain edge gate pole bipolar transistor IGBT (T5) and the 8th insulation gate pole bipolar transistor IGBT (T8) are opened, the electric current of first diode (D1) and the 4th diode (D4) increases gradually, the electric current of second diode (D2) and the 3rd diode (D3) reduces gradually, both finally equate, magnet (L) is by current source converter (csc) two brachium pontis afterflows in parallel, and neither charging is not discharged yet; It more than is the upper half of the action of pentasyllabic quatrain edge gate pole bipolar transistor IGBT (T5), the 6th insulation gate pole bipolar transistor IGBT (T6), four-line poem with seven characters to a line edge gate pole bipolar transistor IGBT (T7) and the 8th insulation gate pole bipolar transistor IGBT (T8); The 6th insulation gate pole bipolar transistor IGBT (T6) and four-line poem with seven characters to a line edge gate pole bipolar transistor IGBT (T7) closure, pentasyllabic quatrain edge gate pole bipolar transistor IGBT (T5) is opened with the 8th insulation gate pole bipolar transistor IGBT (T8), transformer (T) secondary bears negative pressure, and magnet (L) is charged by first diode (D1) and the 4th diode (D4), the electric current of first diode (D1) and the 4th diode (D4) of flowing through increases, the electric current of second diode (D2) and the 3rd diode (D3) reduces, finally, the electric current of second diode (D2) and the 3rd diode (D3) reduces to zero; Then, the 6th insulation gate pole bipolar transistor IGBT (T6) and four-line poem with seven characters to a line edge gate pole bipolar transistor IGBT (T7) are opened, the electric current of second diode (D2) and the 3rd diode (D3) increases gradually, the electric current of first diode (D1) and the 4th diode (D4) reduces gradually, both finally equate, magnet (L) is by current source converter (csc) two brachium pontis afterflows in parallel, and neither charging is not discharged yet; It more than is the lower half of the action of pentasyllabic quatrain edge gate pole bipolar transistor IGBT (T5), the 6th insulation gate pole bipolar transistor IGBT (T6), four-line poem with seven characters to a line edge gate pole bipolar transistor IGBT (T7) and the 8th insulation gate pole bipolar transistor IGBT (T8);

When second switch (S2) closure that is connected with load (LOAD), first switch (S1) that is connected with DC power supply (DC) is when opening, magnet (L) is discharged: if the first insulation gate pole bipolar transistor IGBT (T1), the second insulation gate pole bipolar transistor IGBT (T2), the 3rd insulation gate pole bipolar transistor IGBT (T3) and the 4th insulation gate pole bipolar transistor IGBT (T4) are all closed, the electric current (I) that superconducting magnet this moment (L) flows through carries out afterflow by two brachium pontis in parallel of current source converter (csc), neither charging is not discharged yet; This moment is if make pentasyllabic quatrain edge gate pole bipolar transistor IGBT (T5) and the 8th insulation gate pole bipolar transistor IGBT (T8) closure, the 6th insulation gate pole bipolar transistor IGBT (T6) is opened with four-line poem with seven characters to a line edge gate pole bipolar transistor IGBT (T7), the electric current that then flows through the second insulation gate pole bipolar transistor IGBT (T2) and the 3rd insulation gate pole bipolar transistor IGBT (T3) increases, the electric current of the first insulation gate pole bipolar transistor IGBT (T1) and the 4th insulation gate pole bipolar transistor IGBT (T4) reduces, when the electric current of the first insulation gate pole bipolar transistor IGBT (T1) and the 4th insulation gate pole bipolar transistor IGBT (T4) reduces to zero, turn-off the first insulation gate pole bipolar transistor IGBT (T1) and the insulation gate pole bipolar transistor IGBT (T4), thereby realized the shutoff of zero current, the first insulation gate pole bipolar transistor IGBT (T1) and the 4th insulation gate pole bipolar transistor IGBT (T4) close has no progeny, turn-off pentasyllabic quatrain edge gate pole bipolar transistor IGBT (T5) and the 8th insulation gate pole bipolar transistor IGBT (T8) again, this moment, the inverse parallel parasitic diode by the 6th insulation gate pole bipolar transistor IGBT (T6) and four-line poem with seven characters to a line edge gate pole bipolar transistor IGBT (T7) discharged; After discharge a period of time, if closed first insulation gate pole bipolar transistor IGBT (T1) and the 4th insulation gate pole bipolar transistor IGBT (T4), owing to bear the positive pressure drop that magnet (L) discharge causes on the first insulation gate pole bipolar transistor IGBT (T1) and the 4th insulation gate pole bipolar transistor IGBT (T4), so the first insulation gate pole bipolar transistor IGBT (T1) and the 4th insulation gate pole bipolar transistor IGBT (T4) are open-minded naturally, magnet (L) afterflow on two brachium pontis of current source converter (csc), neither charging is not discharged yet; It more than is the upper half of pentasyllabic quatrain edge gate pole bipolar transistor IGBT (T5), the 6th insulation gate pole bipolar transistor IGBT (T6), four-line poem with seven characters to a line edge gate pole bipolar transistor IGBT (T7) and the 8th insulation gate pole bipolar transistor IGBT (T8) action; Connect half cycle, the first insulation gate pole bipolar transistor IGBT (T1), the second insulation gate pole bipolar transistor IGBT (T2), the 3rd insulation gate pole bipolar transistor IGBT (T3) and the 4th insulation gate pole bipolar transistor IGBT (T4) are all closed, if the 6th insulation gate pole bipolar transistor IGBT (T6) and four-line poem with seven characters to a line edge gate pole bipolar transistor IGBT (T7) closure, pentasyllabic quatrain edge gate pole bipolar transistor IGBT (T5) is opened with the 8th insulation gate pole bipolar transistor IGBT (T8), the electric current that then flows through the first insulation gate pole bipolar transistor IGBT (T1) and the 4th insulation gate pole bipolar transistor IGBT (T4) increases, the electric current of the second insulation gate pole bipolar transistor IGBT (T2) and the 3rd insulation gate pole bipolar transistor IGBT (T3) reduces, when the electric current of the second insulation gate pole bipolar transistor IGBT (T2) and the 3rd insulation gate pole bipolar transistor IGBT (T3) reduces to zero, turn-off the second insulation gate pole bipolar transistor IGBT (T2) and the 3rd insulation gate pole bipolar transistor IGBT (T3), thereby realized the shutoff of zero current, the second insulation gate pole bipolar transistor IGBT (T2) and the 3rd insulation gate pole bipolar transistor IGBT (T3) close has no progeny, turn-off the 6th insulation gate pole bipolar transistor IGBT (T6) and four-line poem with seven characters to a line edge gate pole bipolar transistor IGBT (T7) again, this moment, the inverse parallel parasitic diode by pentasyllabic quatrain edge gate pole bipolar transistor IGBT (T5) and the 8th insulation gate pole bipolar transistor IGBT (T8) discharged, thereby had realized the zero current commutation; After discharge a period of time, if closed second insulation gate pole bipolar transistor IGBT (T2) and the 3rd insulation gate pole bipolar transistor IGBT (T3), owing to bear the positive pressure drop that magnet (L) discharge causes on the second insulation gate pole bipolar transistor IGBT (T2) and the 3rd insulation gate pole bipolar transistor IGBT (T3), so the second insulation gate pole bipolar transistor IGBT (T2) and the 3rd insulation gate pole bipolar transistor IGBT (T3) are open-minded naturally, magnet (L) afterflow on two brachium pontis of current source converter (csc), neither charging is not discharged yet.

4, a kind of control method that is used for charging and discharging currents of adjuster for superconducting magnet, described current regulator is by voltage cell (U _I), transformer unit (U _T), with current unit (U _V) three parts composition; Voltage cell (U _V) be a voltage source converter, the DC side of voltage source converter is that two brachium pontis of capacitor (C) and voltage source converter compose in parallel; Current unit (U _I) be a current source converter (csc), transformer unit (U _T) be and current unit (U _I) link to each other not with the transformer (T) of tap, the structure that it is characterized in that described current regulator as described in (5) time, to its control method as described in (6):

(5) pentasyllabic quatrain edge gate pole bipolar transistor IGBTs (T5) and the 6th insulation gate pole bipolar transistor IGBT (T6) are composed in series a brachium pontis of voltage source converter, and four-line poem with seven characters to a line edge gate pole bipolar transistor IGBT (T7) and the 8th insulation gate pole bipolar transistor IGBT (T8) are composed in series another brachium pontis of voltage source converter; The mid point of two brachium pontis of voltage source converter, promptly the interchange outlet side of voltage source converter links to each other with the former limit of transformer (T); Current unit (U _I) be a current source converter (csc), first thyristor (G1) and the 3rd thyristor (G3) are composed in series a brachium pontis of current source converter (csc), second thyristor (G2) and the 4th thyristor (G4) are composed in series another brachium pontis of current source converter (csc), and superconducting magnet (L) and two brachium pontis compose in parallel the DC side of current source converter (csc); The mid point of two brachium pontis of current source converter (csc), promptly the interchange outlet side of current source converter (csc) links to each other with transformer (T) secondary; The DC side of current source converter (csc) is connected with superconducting magnet (L), the dc bus capacitor device (C) of voltage source converter be connected in parallel by first switch (S1) and DC power supply (DC), second switch (S2) and load (LOAD) branch road of forming that is in series respectively;

(6) when first switch (S1) closure that is connected with DC power supply (DC), the second switch (S2) that is connected with load (LOAD) is when opening, magnet (L) is charged: at first give second thyristor (G2) and the 3rd thyristor (G3) triggering signal, make pentasyllabic quatrain edge gate pole bipolar transistor IGBT (T5) and the 8th insulation gate pole bipolar transistor IGBT (T8) closure then, the 6th insulation gate pole bipolar transistor IGBT (T6) is opened with four-line poem with seven characters to a line edge gate pole bipolar transistor IGBT (T7), transformer (T) secondary bears malleation, make second thyristor (G2) and the 3rd thyristor (G3) conducting, and magnet (L) is charged by second thyristor (G2) and the 3rd thyristor (G3); The electric current of second thyristor (G2) and the 3rd thyristor (G3) of flowing through increases, the electric current of first thyristor (G1) and the 4th thyristor (G4) reduces, finally, the electric current of first thyristor (G1) and the 4th thyristor (G4) reduces to zero, treats that second thyristor (G2) and the 3rd thyristor (G3) conducting recession removes triggering signal; Before pentasyllabic quatrain edge gate pole bipolar transistor IGBT (T5) and the 8th insulation gate pole bipolar transistor IGBT (T8) trigger impulse trailing edge arrival, trigger first thyristor (G1) and the 4th thyristor (G4), when trailing edge arrives, it is open-minded naturally because first thyristor (G1) and the 4th thyristor (G4) bear forward voltage, the electric current (I) that superconducting magnet (L) flows through is by two brachium pontis afterflows in parallel, enter neither charging, the state that does not discharge again; It more than is the action upper half of switching tube; Connect half cycle, this moment is under the afterflow state, give first thyristor (G1) and the 4th thyristor (G4) triggering signal, make the 6th insulation gate pole bipolar transistor IGBT (T6) and four-line poem with seven characters to a line edge gate pole bipolar transistor IGBT (T7) closure then, pentasyllabic quatrain edge gate pole bipolar transistor IGBT (T5) is opened with the 8th insulation gate pole bipolar transistor IGBT (T8), transformer (T) secondary bears negative pressure, make first thyristor (G1) and the 4th thyristor (G4) conducting, and magnet is charged by first thyristor (G1) and the 4th thyristor (G4); The electric current of first thyristor (G1) and the 4th thyristor (G4) of flowing through increases, the electric current of second thyristor (G2) and the 3rd thyristor (G3) reduces, finally, the electric current of second thyristor (G2) and the 3rd thyristor (G3) reduces to zero, treats that first thyristor (G1) and the 4th thyristor (G4) conducting recession removes triggering signal; Before the 6th insulation gate pole bipolar transistor IGBT (T6) and the arrival of four-line poem with seven characters to a line edge gate pole bipolar transistor IGBT (T7) trigger impulse trailing edge, trigger second thyristor (G2) and the 3rd thyristor (G3), when trailing edge arrives, it is open-minded naturally because second thyristor (G2) and the 3rd thyristor (G3) bear forward voltage, the electric current that superconducting magnet (L) flows through is by two brachium pontis afterflows in parallel of current source converter (csc), enter neither charging, the state that does not discharge again;

When second switch (S2) closure that is connected with load (LOAD), first switch (S1) that is connected with DC power supply (DC) is when opening, magnet (L) is discharged: at first, give second thyristor (G2) and the 3rd thyristor (G3) triggering signal, this moment is if make pentasyllabic quatrain edge gate pole bipolar transistor IGBT (T5) and the 8th insulation gate pole bipolar transistor IGBT (T8) closure, the 6th insulation gate pole bipolar transistor IGBT (T6) is opened with four-line poem with seven characters to a line edge gate pole bipolar transistor IGBT (T7), the electric current that then flows through second thyristor (G2) and the 3rd thyristor (G3) increases, the electric current of first thyristor (G1) and the 4th thyristor (G4) reduces, when the electric current of first thyristor (G1) and the 4th thyristor (G4) reduces to zero fully, first thyristor (G1) and the 4th thyristor (G4) zero-crossing switching, first thyristor (G1) and the 4th thyristor (G4) close has no progeny, turn-off pentasyllabic quatrain edge gate pole bipolar transistor IGBT (T5) and the 8th insulation gate pole bipolar transistor IGBT (T8) again, this moment, the inverse parallel parasitic diode by the 6th insulation gate pole bipolar transistor IGBT (T6) and four-line poem with seven characters to a line edge gate pole bipolar transistor IGBT (T7) discharged; After discharge a period of time, give first thyristor (G1) and the 4th thyristor (G4) trigger impulse, owing to bear the positive pressure drop that the magnet discharge causes on first thyristor (G1) and the 4th thyristor (G4), so first thyristor (G1) and the 4th thyristor (G4) are open-minded naturally, the afterflow on two brachium pontis of current source converter (csc) of magnet (L) electric current, neither charging is not discharged yet; More than be first thyristor (G1), second thyristor (G2), the 3rd thyristor (G3) and the 4th thyristor (G4), the upper half of the action of pentasyllabic quatrain edge gate pole bipolar transistor IGBT (T5), the 6th insulation gate pole bipolar transistor IGBT (T6), four-line poem with seven characters to a line edge gate pole bipolar transistor IGBT (T7) and the 8th insulation gate pole bipolar transistor IGBT (T8); Connect half cycle, first thyristor (G1), second thyristor (G2), the 3rd thyristor (G3) and the 4th thyristor (G4) afterflow conducting, reduce to zero in order to prevent the electric current that flows through first thyristor (G1) and the 4th thyristor (G4), first thyristor (G1) and the 4th thyristor (G4) triggering signal do not remove this moment yet, make the 6th insulation gate pole bipolar transistor IGBT (T6) and four-line poem with seven characters to a line edge gate pole bipolar transistor IGBT (T7) closure then, pentasyllabic quatrain edge gate pole bipolar transistor IGBT (T5) is opened with the 8th insulation gate pole bipolar transistor IGBT (T8), the electric current that then flows through first thyristor (G1) and the 4th thyristor (G4) increases, the electric current of second thyristor (G2) and the 3rd thyristor (G3) reduces, when the electric current of second thyristor (G2) and the 3rd thyristor (G3) reduces to zero fully, the second intergranular pipe (G2) and the 3rd thyristor (G3) zero-crossing switching, second thyristor (G2) and the 3rd thyristor (G3) close has no progeny, remove the triggering signal of first thyristor (G1) and the 4th thyristor (G4), turn-off the 6th insulation gate pole bipolar transistor IGBT (T6) and four-line poem with seven characters to a line edge gate pole bipolar transistor IGBT (T7) again, this moment, the inverse parallel parasitic diode by pentasyllabic quatrain edge gate pole bipolar transistor IGBT (T5) and the 8th insulation gate pole bipolar transistor IGBT (T8) discharged, thereby had realized the zero current commutation; After discharge a period of time, if give second thyristor (G2) and the 3rd thyristor (G3) triggering signal, owing to bear the positive pressure drop that the magnet discharge causes on second thyristor (G2) and the 3rd thyristor (G3), so second thyristor (G2) and the 3rd thyristor (G3) are open-minded naturally, magnet (L) afterflow on two brachium pontis of current source converter (csc), neither charging is not discharged yet.

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