CN102638170B - Constant amplitude vector alternating current voltage regulating method - Google Patents

Abstract

The invention discloses a constant amplitude vector alternating current voltage regulating method which is characterized by comprising the steps of: outputting an input voltage vector Upsilon S and a compensation voltage vector Upsilon C of a power supply to an output voltage vector Upsilon O of a load to be connected in sequence so as to obtain the phase difference alpha between the Upsilon S and Upsilon C; and retaining the compensation voltage vector and the input voltage vector of the power supply to be equal, changing the phase angle alpha of the compensation voltage vector relative to the input voltage vector of the power supply, thus realizing the voltage regulation of wide amplitude and being beneficial to retaining of sinusoidal waveform. The constant amplitude vector alternating current voltage regulating method is applicable to a single-phase or three-phase alternating current voltage regulator, an alternating current voltage stabilizer, an alternating current phase shifter, a sinusoidal wave inverter, a sinusoidal wave frequency converter and an electronic power transformer which need wide-amplitude sinusoidal voltage regulation, and further can be used for realizing no contacts, no steps and sine of large-capacity voltage regulation and voltage stabilization.

Description

Permanent width vector AC voltage adjusting method

Technical field

The present invention relates to permanent width vector (or permanent width phasor) AC voltage adjusting method, particularly single-phase or three-phase contactless, stepless, the sinusoidal wave power electronics pressure regulation method of wide cut, method for stabilizing voltage.Belong to AC voltage adjusting, AC voltage-stabilizing technical field.

Background technology

Existing AC voltage adjusting, method for stabilizing voltage mainly contain:

(1) adopt servomotor to drive brush to move and realize the pressure regulation of transformer output voltage, output voltage is realized has level (transformer has a plurality of taps) or stepless (as autotransformer) to regulate.But due to the existence of motor and brush, be the voltage regulating mode that has contact, its shortcoming is that pressure regulation speed is slow, the life-span is short, easily get stuck, volume is large, Heavy Weight etc.

(2) adopt controllable silicon to regulate transformer output voltage as electronic switch, realize contactless voltage regulating mode.But because pressure regulation has level, cannot realize continuous voltage regulating, thereby have the deficiency that output voltage precision is low; Because there being Industrial Frequency Transformer, still have that volume is large, the deficiency of Heavy Weight.

(3) by the mode of AC/DC/AC conversion, realize AC sine wave pressure regulation, the large electrochemical capacitor of direct current ring regulates slowly direct current loop voltag, and while only depending on the index of modulation to control output voltage, when output voltage is higher or lower, have waveform difference, deficiency that precision is low, be difficult to realize wide cut pressure regulation.

(4), while realizing AC sine wave pressure regulation by the mode that AC/AC converts, there is the deficiency that output voltage waveforms is poor, precision is low; Meanwhile, be also difficult to use the system of single phase poaer supply.

Summary of the invention

The object of the invention is provides a kind of permanent width vector (or permanent width phasor) AC voltage adjusting method for the deficiencies in the prior art, is characterized in: contactless, stepless, the sinusoidal wave power electronics pressure regulation of wide cut, voltage stabilizing technique; Be applicable to single, the three-phase system of different capacitance grade; Volume is little, lightweight.

Object of the present invention is realized by following technical measures.

Permanent width vector AC voltage adjusting method comprises the following steps:

1) by the input voltage vector of power supply bucking voltage vector output to the output voltage vector of load connect successively, with between phase difference α; Keep bucking voltage vector input voltage vector with power supply mould equate, change bucking voltage vector input voltage vector with respect to power supply phase angle [alpha], the ratio that obtains the mould of output voltage vector, input voltage vector is:

$\frac{U_O}{U_S}=2\cos \left(\frac{\mathrm{\α}}{2}\right)---\left(1\right)$

From formula (1), when α changes to 0 ° by 180 °, ratio U _o/ U _sfor non-linear and change to 2 by 0 monotonously, so the output voltage U of load _oby changing phase angle [alpha], just can realize the continuous adjusting of wide cut;

2), in AC voltage regulator, work as U _s=U _n, U _nfor rated voltage, require output voltage at (0～1.2) * U _ninterior variation, α is adjusted to 106.26 ° by 180 ° so;

3), in AC voltage regulator, work as U _s=0.5U _n, the low half to rated voltage of input voltage, load voltage still can be maintained rated voltage, α=0 °, U _o=U _n, input voltage is at (0.5～1.0) * U _nchange, output voltage can be stabilized in U _nconstant; Work as U _s>=U _ntime, solving formula (1) and obtain unique α value, α>=120 °, make U _o=U _n, when input voltage is greater than rated voltage, U _s>=U _n, output voltage still can be stabilized in U _nconstant; This method realizes 0.5U _n≤ U _s< ∞ is the AC voltage-stabilizing of wide cut very;

4) do not change size, only adjust relatively phase angle [alpha], just can realize wide cut voltage-regulation; This method also helps maintenance sinusoidal waveform because that two amplitudes equate and have the sinusoidal wave sum of phase difference, ${\stackrel{\&RightArrow;}{U}}_O={\stackrel{\&RightArrow;}{U}}_S+{\stackrel{\&RightArrow;}{U}}_C.$

AC power input voltage the bucking voltage producing through converters compensation, and keep amplitude is constant, and changes its relative supply voltage phase angle [alpha], just can obtain the sinewave output voltage that amplitude is different

Permanent width vector (or permanent width phasor) AC voltage adjusting method is applicable to need single-phase or three phase ac controller, AC voltage regulator, interchange phase shifter, sinewave inverter, sinusoidal wave frequency converter, the electric power electric transformer of wide cut Sinusoidal wave pressure regulating; Can also realize contactless, stepless, the sineization of large capacity AC voltage adjusting, voltage stabilizing.

Tool of the present invention has the following advantages:

(1) realize contactless, the stepless sinusoidal wave power electronics voltage regulator of large capacity wide cut, pressurizer.

(2) be applicable to list, three-phase system.

(3) no industrial frequency transformer, has reduced weight of equipment and volume.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of permanent width vector AC voltage adjusting method.

1. the input voltage vector of power supply 2. bucking voltage vector 3. output to the output voltage vector of load 4. with between phase difference α.

Fig. 2 is U of the present invention _o/ U _svariation relation figure with α.

5. output voltage and input voltage ratio U _o/ U _s, 6. bucking voltage vector and input voltage vector between phase difference α.

Embodiment

Below by embodiment, the present invention is specifically described; be necessary to be pointed out that at this present embodiment can only be used to further illustrate the present invention; can not be interpreted as limiting the scope of the invention, the skilled personnel of this area can make some nonessential improvement and adjustment according to the content of the invention described above.

Embodiment 1

As shown in Figure 1, AC power input voltage the bucking voltage producing through converters compensate, keep amplitude is constant, changes relative input voltage phase angle [alpha] 4, as shown in Figure 2, obtain the sinewave output voltage that amplitude is different ( ).In AC voltage regulator, work as U _s=U _n, U _nfor rated voltage, require output voltage at (0～1.2) * U _ninterior variation, the excursion of α is so: 180 °～106.26 °.Output voltage frequency is identical with supply frequency.

Embodiment 2

As shown in Figure 1, AC power input voltage the bucking voltage producing through converters compensate, keep amplitude is constant, changes relative input voltage phase angle [alpha] 4, as shown in Figure 2, obtain the sinewave output voltage that amplitude is different ( ).In AC voltage regulator, work as U _s=0.5U _n, i.e. the low half to rated voltage of input voltage, load voltage still can reach rated voltage, during α=0 °, has U _o=U _n.So input voltage is at (0.5～1.0) * U _ntime, output voltage can remain rated value.Work as U _s>=U _ntime, solve formula (1) and always can obtain unique α value (α>=120 °) and make U _o=U _n.Realize (0.5U _n≤ U _s< ∞) the unusual AC voltage-stabilizing of wide cut.Output voltage frequency is identical with supply frequency.

Embodiment 3

As shown in Figure 1, AC power input voltage the bucking voltage producing through converters compensate, keep amplitude is constant, changes relative input voltage phase angle [alpha] 4, as shown in Figure 2, obtain the sinewave output voltage that amplitude is different ( ).In exchanging phase shifter, work as U _s=U _n, U _nfor rated voltage, the adjustment process of α is (0 ° → 90 ° → 180 °), and output voltage is changed to (2U so _n→ 1.4U _n→ 0), output voltage with respect to input voltage being changed to of phase difference (0 ° → 45 ° → 90 °).Output voltage frequency is identical with supply frequency.

Embodiment 4

As shown in Figure 1, AC power input voltage the bucking voltage producing through converters compensate, keep amplitude is constant, changes relative input voltage phase angle [alpha] 4, as shown in Figure 2, obtain the sinewave output voltage that amplitude is different ( ).In sinewave inverter, possibility of reversal produces two constant amplitude and equates, has simultaneously the sine voltage vector of phase difference α: with be equivalent to be equivalent to so have change with phase difference α, realize the pressure regulation of Voltage-output; The frequency of output voltage is fixed but can be different from supply frequency.

Embodiment 5

As shown in Figure 1, AC power input voltage the bucking voltage producing through converters compensate, keep amplitude is constant, changes relative input voltage phase angle [alpha] 4, as shown in Figure 2, obtain the sinewave output voltage that amplitude is different ( ).In sinusoidal wave frequency converter, possibility of reversal produces two constant amplitude and equates, has simultaneously the sine voltage vector of phase difference α: with be equivalent to be equivalent to so have change with frequency and phase difference α, realize the frequency modulation and voltage modulation of output voltage.

Embodiment 6

As shown in Figure 1, AC power input voltage the bucking voltage producing through converters compensate, keep amplitude is constant, changes relative input voltage phase angle [alpha] 4, as shown in Figure 2, obtain the sinewave output voltage that amplitude is different ( ).In electric power electric transformer, possibility of reversal produces two constant amplitude and equates, has simultaneously the sine voltage vector of phase difference α: with be equivalent to be equivalent to so have realization, as the comprehensive function of AC voltage regulator, AC voltage regulator, interchange phase shifter, improves the controllability of power transformer.

Embodiment 7

As shown in Figure 1, AC power input voltage the bucking voltage producing through converters compensate, keep amplitude is constant, changes relative input voltage phase angle [alpha] 4, as shown in Figure 2, obtain the sinewave output voltage that amplitude is different ( ).In embodiment 1～6, single phase circuit, by triangle or star connection, obtains three phase ac controller, three-phase AC voltage stabilizer, three-phase alternating current phase shifter, three-phase sine wave inverter, three-phase sine-wave frequency converter, three-phase power electronic transformer successively.

Claims (3)

1. a permanent width vector AC voltage adjusting method, is characterized in that this AC voltage adjusting method comprises the following steps:

1) by the input voltage vector of power supply (1), bucking voltage vector (2), output to the output voltage vector of load (3) connect successively, with between phase difference be α (4); Keep bucking voltage vector input voltage vector with power supply mould equate, change bucking voltage vector input voltage vector with respect to power supply phase difference α, the ratio that obtains the mould of output voltage vector, input voltage vector is:

$\frac{U_O}{U_S}=2\cos \left(\frac{\mathrm{\&alpha;}}{2}\right)---\left(1\right)$

From formula (1), when α changes to 0 ° by 180 °, ratio U _o/ U _sfor non-linear and change to 2 by 0 monotonously, so the output voltage U of load _oby changing phase difference α, just can realize the continuous adjusting of wide cut;

2), in AC voltage regulator, work as U _s=U _n, U _nfor rated voltage, because of U _c=U _sand remain U _nconstant, require output voltage at (0～1.2) * U _ninterior variation, α is adjusted to 106.26 ° by 180 ° so;

3), in AC voltage regulator, work as U _s=0.5U _n, the low half to rated voltage of input voltage, load voltage still can be maintained rated voltage, α=0 °, U _o=U _n, input voltage is at (0.5～1.0) * U _nchange, output voltage can be stabilized in U _nconstant; Work as U _s>=U _ntime, solving formula (1) and obtain unique α value, α>=120 °, make U _o=U _n, when input voltage is greater than rated voltage, U _s>=U _n, output voltage still can be stabilized in U _nconstant; This method has realized 0.5U _n≤ U _s< ∞ is the AC voltage-stabilizing of wide cut very;

4) do not change size, only adjust relatively phase difference α, just can realize wide cut voltage-regulation; This method also helps maintenance sinusoidal waveform because that two amplitudes equate and have the sinusoidal wave sum of phase difference,

2. permanent width vector AC voltage adjusting method as claimed in claim 1, is characterized in that: AC power input voltage vector the bucking voltage vector producing through converters compensate, and keep amplitude is constant, and change, it is relative phase difference α, just can obtain the sinewave output voltage vector that amplitude is different

3. permanent width vector AC voltage adjusting method as claimed in claim 1, is characterized in that: permanent width vector AC voltage adjusting method is applicable to need single-phase or three phase ac controller, AC voltage regulator, interchange phase shifter, sinewave inverter, sinusoidal wave frequency converter, the electric power electric transformer of wide cut Sinusoidal wave pressure regulating; Can also realize contactless, stepless, the sineization of large capacity AC voltage adjusting, voltage stabilizing.