CN104883073A - Multi-module parallel output current-sharing current transformer - Google Patents
Multi-module parallel output current-sharing current transformer Download PDFInfo
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- CN104883073A CN104883073A CN201510291726.XA CN201510291726A CN104883073A CN 104883073 A CN104883073 A CN 104883073A CN 201510291726 A CN201510291726 A CN 201510291726A CN 104883073 A CN104883073 A CN 104883073A
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Abstract
The invention discloses a multi-module parallel output current-sharing current transformer. The multi-module parallel output current-sharing current transformer comprises a rectification module, a first inversion module and a second inversion module which are successively arranged. The input of the current transformer is three-phase AC power which, through the rectification module, is converted into DC power as the input of the first inversion module and the second inversion module; four branches of the first inversion module and four branches of the second inversion module are connected in parallel between a positive busbar and a negative busbar of a DC side; output signals of the first inversion module and the second inversion module are used for supplying power to a traction motor to drive the traction motor to run; and when the traction motor stops running, a brake resistor starts working to consume voltage on the positive busbar and the negative busbar at the DC side of the current transformer, such that personal safety is guaranteed. The multi-module parallel output current-sharing current transformer brought forward by the invention is small in technical difficulty, low in investment cost and good in current sharing effect, perfectly solves the parallel output current sharing problem, reduces the production cost and the technical difficulty of the current transformer and enables batch production of a large-power current transformer to be possible.
Description
Technical field
The present invention relates to converter circuit technical field, refer to that a kind of multiple module paralleling exports current-sharing current transformer especially.
Background technology
Along with the demand of market to high power electronic equipment constantly increases, the power stage of single spur track device, cannot meet industry gradually to powerful demand.Usually, adopt the mode that multiple power electronic device (as IGBT) is in parallel, form the power model of more high current density, improve the power grade of power electronic equipment.But in the parallel connection of many devices, exporting equal flow problem is a technical barrier always, hinder the paces of current transformer to more high power level development.
Be below several existing current equalizing method:
1) current equalizer that whole unsteady flow exports all is encapsulated on same copper coin, by symmetric design, same size and same impedance, realizes the current-sharing of many branch roads; But because whole current equalizer all concentrates on one piece of copper coin, equipment volume is not easy to promote, and can only improve power density, but can not meet the demand of industry to high-power converter;
2) by output, seal in cross one another restrictor ring to suppress current imbalance, thus reach the object of output Current for paralleled; Suppress unsymmetrical current by adding electric current loop, but adding of electric current loop adds equipment cost undoubtedly, too increases likelihood of failure.
For meeting the powerful demand of industrial circle, if the performance of simple improvement power electric component, do not catch up with the demand of industrial circle to power completely.Meanwhile, merely from the angle improving power stage, by improving output voltage, the electric current of inversion module, meet powerful requirement.But the rated voltage of current transformer load becomes industry standard mostly, and load equipment also impossible unconfined raising magnitude of voltage, otherwise personal safety will be endangered greatly, therefore improve inversion module output current, become the most promising research direction.
In recent years, that studies multiple module paralleling along with Lai Ge great producer, scientific research institutions gos deep into, and parallel module exports equal flow problem and seems day by day thorny.The existence of unsymmetrical current, produces very large over-current shock by IGBT device, accelerates the damage speed of IGBT device, thereby also reduces the performance of current transformer, add the maintenance cost of equipment.Equal flow problem can not get good solution, and the batch production of current transformer multiple module paralleling may realize hardly, and so-called theoretical research also can become has no real value.
Summary of the invention
In view of this, the present invention is from the angle of manufacturer, repeatedly Technology design and scheme optimization are carried out to current transformer, in conjunction with company's reasonable resource, simulation study is carried out to current transformer model and model machine is developed, its object is to propose the multiple module paralleling that a kind of technical difficulty is little, input cost is low, current-sharing is effective and export current-sharing current transformer, not only perfectly solve the equal flow problem of Parallel opertation, also reduce production cost and the technology difficulty of current transformer, make the volume production of high-power converter become possibility.
Based on above-mentioned purpose, the multiple module paralleling that the present invention proposes exports current-sharing current transformer, comprises the rectification module, the first inversion module, the second inversion module that set gradually;
Described first inversion module comprises four branch roads in parallel, is respectively the first branch road, the second branch road, the 3rd branch road, the 4th branch road, and every bar props up two IGBT compositions of route series connection; Described second inversion module also comprises four branch roads in parallel, and be respectively the 5th branch road, the 6th branch road, the 7th branch road, the 8th branch road, every bar branch road is also made up of two IGBT connected;
Described current transformer be input as three-phase alternating current, after rectification module, become direct current, as the input of the first inversion module and the second inversion module; Four branch roads of the first inversion module and four branch roads of the second inversion module are all connected in parallel between the positive busbar of DC side and negative busbar;
Wherein, export after the mid point between two series IGBTs of the first branch road and the mid point parallel connection between two series IGBTs of the second branch road, the U phase as traction electric machine inputs; Export after mid point between two series IGBTs of the 3rd branch road and the mid point parallel connection between two series IGBTs of the 4th branch road, the V phase as traction electric machine inputs; Export after mid point between two series IGBTs of the 5th branch road and the mid point parallel connection between two series IGBTs of the 6th branch road, the W phase as traction electric machine inputs; Export after mid point between two series IGBTs of the 7th branch road and the mid point parallel connection between two series IGBTs of the 8th branch road, receive one end of brake resistance, the brake resistance other end and direct current are born busbar and are connected, common formation copped wave loop;
The output signal of the first inversion module and the second inversion module, for powering to traction electric machine, drives traction electric machine running; When traction electric machine is out of service, brake resistance is started working, and consumes the voltage on the positive busbar of current transformer DC side and negative busbar, ensures personal safety.
In some embodiments, the first branch road and the second branch road that connect traction electric machine U phase are integrated in the first inversion module, and the 3rd branch road and the 4th branch road that connect traction electric machine V phase are also integrated in the first inversion module, the 5th branch road and the 6th branch road that connect traction electric machine W phase are integrated in the second inversion module, 7th branch road and the 8th branch road in brake resistance copped wave loop are integrated in the second inversion module, first branch road, second branch road, 3rd branch road, 4th branch road, 5th branch road, 6th branch road, 7th branch road, each IGBT in 8th branch road connects master control borad through pulse distribution plate respectively, master control borad receives the logical signal of current transformer actual condition, then impulse wave is calculated, by optical fiber, this signal is passed to pulse distribution plate, this impulse wave is distributed, the first branch road is passed to respectively by optical fiber, second branch road, 3rd branch road, 4th branch road, 5th branch road, 6th branch road, 7th branch road, each IGBT in 8th branch road, thus control opening and shutoff of each IGBT separately.
In some embodiments, first branch road, second branch road, 3rd branch road, 4th branch road, 5th branch road, 6th branch road, 7th branch road, the first current sensor is in series with respectively in 8th branch road, second current sensor, 3rd current sensor, 4th current sensor, 5th current sensor, 6th current sensor, 7th current sensor, 8th current sensor, the electric current of branch road is exported for detecting every bar respectively, guarantee that parallel branch output current is consistent in allowed band, these eight current sensors connect master control borad respectively, when parallel branch output current exceeds allowed band, master control borad will quote unsymmetrical current fault.
In some embodiments, with the first cable that the mid point between the IGBT of two series connection is terminal for starting point and with the intersection point converged with the second branch road in described first branch road, with in described second branch road with the mid point between two IGBT connected for starting point and with equal with the length of the second cable that the intersection point that the first branch road converges is terminal;
And/or,
With the 3rd cable that the mid point between the IGBT of two series connection is terminal for starting point and with the intersection point converged with the 4th branch road in described 3rd branch road, with in described 4th branch road with the mid point between two IGBT connected for starting point and with equal with the length of the 4th cable that the intersection point that the 3rd branch road converges is terminal;
And/or,
With the 5th cable that the mid point between the IGBT of two series connection is terminal for starting point and with the intersection point converged with the 6th branch road in described 5th branch road, with in described 6th branch road with the mid point between two IGBT connected for starting point and with equal with the length of the 6th cable that the intersection point that the 5th branch road converges is terminal;
And/or,
With the 7th cable that the mid point between the IGBT of two series connection is terminal for starting point and with the intersection point converged with the 8th branch road in described 7th branch road, with in described 8th branch road with the mid point between two IGBT connected for starting point and with equal with the length of the 8th cable that the intersection point that the 7th branch road converges is terminal.
In some embodiments, the sectional area of described first cable, the second cable, the 3rd cable, the 4th cable, the 5th cable, the 6th cable, the 7th cable, the 8th cable is all not less than 95mm
2, and every root cable length is not less than 1.5m.
As can be seen from above, multiple module paralleling provided by the invention exports current-sharing current transformer, by the improvement of the design to main circuit of converter topological structure, inversion module internal structure, the selection of inversion module output cable and test, a kind of current-sharing of final proposition is respond well, meet the need of market, and the current transformer that can manufacture exports the solution of current-sharing.This multiple module paralleling exports current-sharing current transformer, by the output branch road of current transformer parallel module, be incorporated in same inversion module, ensure that the IGBT device of Parallel opertation branch road, controlled to turn on and off by same master control borad, same pulse distribution plate, thus ensure that IGBT device opens the simultaneity of shutoff; When converter topology conceptual design, in order to suppress the unsymmetrical current of Parallel opertation, by the Parallel opertation branch road of current transformer, draw with isometric cable, receive in load, like this, just ensure that two branch cable inductance values of Parallel opertation are consistent, suppress unsymmetrical current ability suitable; For ensureing that the inductance value of output cable effectively can suppress unsymmetrical current, during design, output cable being calculated and selecting, requiring that the cross-section of cable of Parallel opertation is long-pending and be not less than 95mm
2, and every root cable length is not less than 1.5m.
Accompanying drawing explanation
Fig. 1 is the principle schematic that multiple module paralleling provided by the invention exports current-sharing current transformer embodiments;
Fig. 2 is the principle schematic that multiple module paralleling provided by the invention exports inversion module in current-sharing current transformer embodiments;
Fig. 3 is the control principle schematic diagram that multiple module paralleling provided by the invention exports inversion module in current-sharing current transformer embodiments.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
The explanation of nouns of relevant technical terms:
DRU: rectification module;
INU: inversion module;
IGBT: insulated gate bipolar transistor;
LH3 ~ LH10: current sensor;
Brake resistance: the one being ripple resistance, is mainly used in current transformer and controls in the traction electric machine mechanical system of stopping fast, help traction electric machine by it because the regenerative electric energy produced that stops fast is converted into heat energy.
It should be noted that, in the embodiment of the present invention, the statement of all uses " first " and " second " is all the parameters in order to the entity or non-equal distinguishing two same names non-equal, visible " first " " second " convenience only in order to state, should not be construed as the restriction to the embodiment of the present invention, subsequent embodiment illustrates no longer one by one to this.
With reference to accompanying drawing 1, for multiple module paralleling provided by the invention exports the principle schematic of current-sharing current transformer embodiments.
Fig. 1 is depicted as main circuit of converter topological structure, and described multiple module paralleling exports current-sharing current transformer, comprises the rectifier module D RU, the first inversion module INU1, the second inversion module INU2 that set gradually;
A DC capacitor and eight IGBT are encapsulated in described first inversion module INU1, comprise four branch roads in parallel, be respectively the first branch road, the second branch road, the 3rd branch road, the 4th branch road, every bar props up two IGBT compositions of route series connection, and is unified into whole first inversion module INU1; Also a DC capacitor and eight IGBT are encapsulated in described second inversion module INU2, also four branch roads in parallel are comprised, be respectively the 5th branch road, the 6th branch road, the 7th branch road, the 8th branch road, every bar branch road is also made up of two IGBT connected, and is unified into whole second inversion module INU2;
Described current transformer be input as three-phase alternating current, after rectification module, become direct current, as the input of the first inversion module INU1 and the second inversion module INU2; Four branch roads of the first inversion module INU1 and four branch roads of the second inversion module INU2 are all connected in parallel between the positive busbar (DCP) of DC side and negative busbar (DCN); As shown in Figure 2, DCP, DCN are the direct-flow input end of each inversion module, and wherein DCP is positive busbar, and DCN is negative busbar; Each inversion module all has A, B, C, D to export on totally four tunnels, opens shutoff, export three-phase alternating current by software control IGBT device;
Wherein, export after mid point A1 between two series IGBTs of the first branch road and the mid point B1 parallel connection between two series IGBTs of the second branch road, U phase as traction electric machine inputs (that is: the signal that the mid point B1 between the signal that the mid point A1 between the IGBT of two of the first branch road series connection draws and two IGBT connect of the second branch road draws come together in the first intersection point T1 also together with as the input of the U phase of traction electric machine), the U phase of traction electric machine, export after mid point C1 between two series IGBTs of the 3rd branch road and the mid point D1 parallel connection between two series IGBTs of the 4th branch road, V phase as traction electric machine inputs (that is: the signal that the mid point D1 between the signal that the mid point C1 between the IGBT of two of the 3rd branch road series connection draws and two IGBT connect of the 4th branch road draws come together in the second intersection point T2 also together with as the input of the V phase of traction electric machine, the V phase of traction electric machine), export after mid point A2 between two series IGBTs of the 5th branch road and the mid point B2 parallel connection between two series IGBTs of the 6th branch road, W phase as traction electric machine inputs (that is: the signal that the mid point B2 between the signal that the mid point A2 between the IGBT of two of the 5th branch road series connection draws and two IGBT connect of the 6th branch road draws come together in the 3rd intersection point T3 also together with as the input of the W phase of traction electric machine, the W phase of traction electric machine), open shutoff by what control IGBT in these several branch roads, current transformer exports three-phase alternating current, for traction electric machine, export after mid point C2 between two series IGBTs of the 7th branch road and the mid point D2 parallel connection between two series IGBTs of the 8th branch road, receive one end of brake resistance, the brake resistance other end and direct current are born busbar and are connected, (that is: the lead-out wire that the mid point D2 between the signal that the mid point C2 between the IGBT of two of the 7th branch road series connection draws and two IGBT connected of the 8th branch road draws comes together in the 4th intersection point T4 and is connected one end Chop of brake resistance common formation copped wave loop (brake circuit), brake resistance other end DC-connects DC side and bears busbar (DCN) and form copped wave loop), when traction electric machine is stopped transport, open shutoff by what control these two branch road IGBT, make the conducting of braking branch road, consume the electricity that in current transformer, DC capacitor stores, ensure the personal safety of maintainer,
The output signal of the first inversion module INU1 and the second inversion module INU2, for powering to traction electric machine, drives traction electric machine running; When traction electric machine is out of service, brake resistance is started working, and consumes the voltage on current transformer DC master row (DCP and DCN), ensures personal safety.
In conjunction with reference accompanying drawing 2 and accompanying drawing 3, the two is respectively multiple module paralleling provided by the invention and exports the principle schematic of inversion module and the control principle schematic diagram of inversion module in current-sharing current transformer embodiments.
Preferably, (combine with reference to Fig. 1) as shown in Figures 2 and 3, the first branch road and the second branch road that connect traction electric machine U phase are integrated in the first inversion module INU1, and the 3rd branch road and the 4th branch road that connect traction electric machine V phase are also integrated in the first inversion module INU1, the 5th branch road and the 6th branch road that connect traction electric machine W phase are integrated in the second inversion module INU2, 7th branch road in brake resistance copped wave loop and the 8th branch road are integrated in the second inversion module INU2, first branch road, second branch road, 3rd branch road, 4th branch road, 5th branch road, 6th branch road, 7th branch road, each IGBT in 8th branch road connects master control borad through pulse distribution plate respectively, master control borad receives the logical signal of current transformer actual condition, then impulse wave is calculated, by optical fiber, this signal is passed to pulse distribution plate, by pulse distribution plate, this impulse wave is distributed, and pass to the first branch road respectively by optical fiber, second branch road, 3rd branch road, 4th branch road, 5th branch road, 6th branch road, 7th branch road, each IGBT in 8th branch road, thus control opening and shutoff of each IGBT separately.Visible, every bar branch road IGBT device open shutoff, carry out the calculating of control algolithm by same master control borad, by same pulse distribution plate send pulse, by same optical signal transmission fiber, the IGBT device this ensures that thered in branch road opens the simultaneity of shutoff.Certainly, also can be two paired branch roads and connect separately pulse distribution plate or connect pulse distribution plate and master control borad separately, also all can realize.
Further, with reference to accompanying drawing 1, first branch road, second branch road, 3rd branch road, 4th branch road, 5th branch road, 6th branch road, 7th branch road, the first current sensor LH3 is in series with respectively in 8th branch road, second current sensor LH4, 3rd current sensor LH5, 4th current sensor LH6, 5th current sensor LH7, 6th current sensor LH8, 7th current sensor LH9, 8th current sensor LH10, for detecting the electric current of every bar output branch road respectively, (current sensor LH3 ~ LH6 detects the electric current of the output branch road of the first inversion module INU1, LH7 ~ LH10 detects the electric current of the output branch road of the second inversion module INU2, the current value that current sensor records, as the overcurrent protection of motor, unbalanced current protection), guarantee that parallel branch output current is consistent in allowed band, these eight current sensors connect master control borad respectively, when parallel branch output current exceeds allowed band, master control borad will quote unsymmetrical current fault.
Known Circuit theory, the size of branch impedance is very large on the impact of branch current.When current transformer conceptual design, consider the inductance value of cable and cable length in close relations.For ensureing that parallel branch is suitable to the inhibitory action of unsymmetrical current, require that the cable length of parallel branch is consistent.Concrete length is as shown in the table:
Therefore, preferably, with reference to accompanying drawing 1, with the first cable that the mid point A1 between the IGBT of two series connection is terminal for starting point and with the first intersection point T1 converged with the second branch road in described first branch road, with in described second branch road with the mid point B2 between two IGBT connected for starting point and with equal with the length of the second cable that the first intersection point T1 that the first branch road converges is terminal (namely the first cable is equal with the second cable length);
And/or,
With reference to accompanying drawing 1, with the 3rd cable that the mid point C1 between the IGBT of two series connection is terminal for starting point and with the second intersection point T2 converged with the 4th branch road in described 3rd branch road, with in described 4th branch road with the mid point D1 between two IGBT connected for starting point and with equal with the length of the 4th cable that the second intersection point T2 that the 3rd branch road converges is terminal (namely the 3rd cable is equal with the 4th cable length);
And/or,
With reference to accompanying drawing 1, with the 5th cable that the mid point A2 between the IGBT of two series connection is terminal for starting point and with the 3rd intersection point T3 converged with the 6th branch road in described 5th branch road, with in described 6th branch road with the mid point B2 between two IGBT connected for starting point and with equal with the length of the 6th cable that the 3rd intersection point T3 that the 5th branch road converges is terminal (namely the 5th cable is equal with the 6th cable length);
And/or,
With reference to accompanying drawing 1, with the 7th cable that the mid point C2 between the IGBT of two series connection is terminal for starting point and with the 4th intersection point T4 converged with the 8th branch road in described 7th branch road, with in described 8th branch road with the mid point D2 between two IGBT connected for starting point and with equal with the length of the 8th cable that the 4th intersection point T4 that the 7th branch road converges is terminal (namely the 7th cable is equal with the 8th cable length).
Further, through the checking of Technology design, simulation result and model machine, for ensureing that the inductance value of output cable effectively can suppress unsymmetrical current, during design, type selecting is carried out to output cable.Basic demand is: the sectional area of described first cable, the second cable, the 3rd cable, the 4th cable, the 5th cable, the 6th cable, the 7th cable, the 8th cable is all not less than 95mm
2, and every root cable length is not less than 1.5m.
As can be seen from above-described embodiment, multiple module paralleling provided by the invention exports current-sharing current transformer, solves high-power converter because of wired in parallel, and the technical barrier of the unsymmetrical current produced; The present invention, by the IGBT device of the Parallel opertation branch road of inversion module, concentrates in same inversion module, ensures that IGBT device opens the simultaneity of shutoff; Parallel opertation branch road adopts sectional area 95mm
2above, more than length 1.5m, and isometric cable, ensure that the unsymmetrical current of every bar branch road can effectively be suppressed, and rejection ability is suitable.
Multiple module paralleling provided by the invention exports current-sharing current transformer, and current-sharing is effective, and structure is simple, easy for installation, and Financial cost is reasonable, is applicable to the batch production of industrial current transformer; In specific implementation, simple; The IGBT device of parallel branch, all by same master control borad, same pulse distribution plate controls to open and shutoff, reducing control algolithm to time precision requirement, because this reducing the requirement of master control borad to program, also reducing the development cost of current transformer simultaneously; The present invention has stricter requirement to current transformer output cable, utilizes cable inductance to suppress unsymmetrical current, replaces knowing clearly the effect of the device such as equalizing reactor, flow equalizing ring, reduces current transformer cost, also ensure that the effect of current-sharing; In the present invention, every bar exports on branch road is all furnished with current sensor, the current value of each branch road of detection that can be real-time, and when unsymmetrical current is excessive, current transformer report fault trip, ensure that the current balance function of Parallel opertation.
It needs to be noted; except the current transformer Dual module parallel output current equalizing scheme of clear description in the present invention; current transformer is exported and carries out three wired in parallel, four module parallel connection; and the IGBT device of all parallel branches, the technical scheme all controlling to open shutoff by same master control borad, pulse distribution plate all should belong to protection scope of the present invention.
Those of ordinary skill in the field are to be understood that: the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. multiple module paralleling exports a current-sharing current transformer, it is characterized in that, comprises the rectification module, the first inversion module, the second inversion module that set gradually;
Described first inversion module comprises four branch roads in parallel, is respectively the first branch road, the second branch road, the 3rd branch road, the 4th branch road, and every bar props up two IGBT compositions of route series connection; Described second inversion module also comprises four branch roads in parallel, and be respectively the 5th branch road, the 6th branch road, the 7th branch road, the 8th branch road, every bar branch road is also made up of two IGBT connected;
Described current transformer be input as three-phase alternating current, after rectification module, become direct current, as the input of the first inversion module and the second inversion module; Four branch roads of the first inversion module and four branch roads of the second inversion module are all connected in parallel between the positive busbar of DC side and negative busbar;
Wherein, export after the mid point between two series IGBTs of the first branch road and the mid point parallel connection between two series IGBTs of the second branch road, the U phase as traction electric machine inputs; Export after mid point between two series IGBTs of the 3rd branch road and the mid point parallel connection between two series IGBTs of the 4th branch road, the V phase as traction electric machine inputs; Export after mid point between two series IGBTs of the 5th branch road and the mid point parallel connection between two series IGBTs of the 6th branch road, the W phase as traction electric machine inputs; Export after mid point between two series IGBTs of the 7th branch road and the mid point parallel connection between two series IGBTs of the 8th branch road, receive one end of brake resistance, the brake resistance other end and direct current are born busbar and are connected, common formation copped wave loop;
The output signal of the first inversion module and the second inversion module, for powering to traction electric machine, drives traction electric machine running; When traction electric machine is out of service, brake resistance is started working, and consumes the voltage on the positive busbar of current transformer DC side and negative busbar, ensures personal safety.
2. current transformer according to claim 1, is characterized in that, the first branch road and the second branch road that connect traction electric machine U phase are integrated in the first inversion module, and the 3rd branch road and the 4th branch road that connect traction electric machine V phase are also integrated in the first inversion module, the 5th branch road and the 6th branch road that connect traction electric machine W phase are integrated in the second inversion module, 7th branch road and the 8th branch road in brake resistance copped wave loop are integrated in the second inversion module, first branch road, second branch road, 3rd branch road, 4th branch road, 5th branch road, 6th branch road, 7th branch road, each IGBT in 8th branch road connects master control borad through pulse distribution plate respectively, master control borad receives the logical signal of current transformer actual condition, then impulse wave is calculated, by optical fiber, this signal is passed to pulse distribution plate, this impulse wave is distributed, the first branch road is passed to respectively by optical fiber, second branch road, 3rd branch road, 4th branch road, 5th branch road, 6th branch road, 7th branch road, each IGBT in 8th branch road, thus control opening and shutoff of each IGBT separately.
3. current transformer according to claim 1, it is characterized in that, first branch road, second branch road, 3rd branch road, 4th branch road, 5th branch road, 6th branch road, 7th branch road, the first current sensor is in series with respectively in 8th branch road, second current sensor, 3rd current sensor, 4th current sensor, 5th current sensor, 6th current sensor, 7th current sensor, 8th current sensor, the electric current of branch road is exported for detecting every bar respectively, guarantee that parallel branch output current is consistent in allowed band, these eight current sensors connect master control borad respectively, when parallel branch output current exceeds allowed band, master control borad will quote unsymmetrical current fault.
4. current transformer according to claim 1, it is characterized in that, with the first cable that the mid point between the IGBT of two series connection is terminal for starting point and with the intersection point converged with the second branch road in described first branch road, with in described second branch road with the mid point between two IGBT connected for starting point and with equal with the length of the second cable that the intersection point that the first branch road converges is terminal;
And/or,
With the 3rd cable that the mid point between the IGBT of two series connection is terminal for starting point and with the intersection point converged with the 4th branch road in described 3rd branch road, with in described 4th branch road with the mid point between two IGBT connected for starting point and with equal with the length of the 4th cable that the intersection point that the 3rd branch road converges is terminal;
And/or,
With the 5th cable that the mid point between the IGBT of two series connection is terminal for starting point and with the intersection point converged with the 6th branch road in described 5th branch road, with in described 6th branch road with the mid point between two IGBT connected for starting point and with equal with the length of the 6th cable that the intersection point that the 5th branch road converges is terminal;
And/or,
With the 7th cable that the mid point between the IGBT of two series connection is terminal for starting point and with the intersection point converged with the 8th branch road in described 7th branch road, with in described 8th branch road with the mid point between two IGBT connected for starting point and with equal with the length of the 8th cable that the intersection point that the 7th branch road converges is terminal.
5. current transformer according to claim 4, is characterized in that, the sectional area of described first cable, the second cable, the 3rd cable, the 4th cable, the 5th cable, the 6th cable, the 7th cable, the 8th cable is all not less than 95mm
2, and every root cable length is not less than 1.5m.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106936360A (en) * | 2015-12-29 | 2017-07-07 | 上海大郡动力控制技术有限公司 | Multi-function motor controller based on wired in parallel |
| CN107104603A (en) * | 2016-02-22 | 2017-08-29 | 中车株洲电力机车研究所有限公司 | Device current equalizing structure and method under the protection of three level IGCT current transformers standard-sized sheets |
| CN110719045A (en) * | 2019-10-29 | 2020-01-21 | 中车长春轨道客车股份有限公司 | Chopping control system of traction inverter |
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| CN111092452A (en) * | 2019-12-11 | 2020-05-01 | 深圳市禾望电气股份有限公司 | Wind power converter system |
| CN111092452B (en) * | 2019-12-11 | 2023-09-29 | 深圳市禾望电气股份有限公司 | Wind power converter system |
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