CN102983620A - Auxiliary convertor and parallel connection control method thereof - Google Patents

Abstract

An auxiliary convertor comprises an inverter and an auxiliary convertor output control device, wherein the inverter converts direct currents into alternating currents, and the auxiliary convertor output control device carries out sampling and processing to output of the inverter and controls the output voltage of the inverter by combining output voltage sampling information of a parallel bus. The auxiliary convertor is suitable for locomotives, motor train units, subways and inter-city trains.

Description

A kind of AuCT and control method for parallel thereof

Technical field

The present invention relates to a kind of train apparatus, especially, relate to a kind of EMU AuCT and control method for parallel thereof.

Background technology

AuCT on the EMU is the power electronic equipment of the alternating current that is 3 phase 440V, 60 hertz (Hz) of 3000 volts of (V) dc inverters with traction convertor intermediate link and the power supplies such as the threephase load on the EMU and charger.AuCT is the main power supply unit on the EMU, is concerning the runnability of EMU, requires output power large, and reliability is high, and the feasibility that therefore improves power supply is extremely important.

High-power AuCT electric power system has two kinds of constituted modes: the one, adopt the high-power AuCT centrally connected power supply of separate unit, and the 2nd, adopt every joint compartment an AuCT to be installed to this compartment power supply.There is following shortcoming in the high-power AuCT central power supply system of separate unit: the one, and the cost of high-power converter is high; The 2nd, volume, weight are large, and difficulty is installed; The 3rd, poor reliability, Single Point of Faliure will make systemic breakdown.An AuCT is installed to this compartment power supply, so that complexity, poor reliability are installed by system in every joint compartment.

Existing AuCT also exists very large shortcoming.AuCT output be the time become and the positive and negative sine wave that alternately changes, need to control simultaneously the same amplitude of sine wave output, same frequency, same-phase and same phase sequence during parallel connection.In parallel system, if the sine wave of AuCT output is same amplitude, same frequency, synchronous, but phase sequence is not identical, then can't realize parallel connection.If the sine wave of AuCT output is same amplitude, same frequency and with phase sequence, but has phase difference, the part AuCT is operated in rectification state so, forms larger circulation.If the sine wave of AuCT output is same-phase, same frequency and with phase sequence, but amplitude is different, the part AuCT both powered to the load so, powered to other AuCT again.In addition, though sinusoidal wave same amplitude, same frequency, same-phase and the same phase sequence of AuCT output, but the multifrequency sinusoid content of output there are differences separately, at this moment has harmonic circulating current between each AuCT.So the control of AuCT parallel system and design very complex.At present, technical in the urgent need to a kind of current transformer technology of using of being suitable for reliably.

Summary of the invention

For the above-mentioned problems in the prior art, according to an aspect of the present invention, proposition 1, a kind of AuCT comprise: inverter, with converting direct-current power into alternating-current power; And the AuCT output-controlling device, the output of described inverter is sampled, processed, and in conjunction with the output voltage sample information of bus in parallel, control the output voltage of the device of described inverter.

Further, aforesaid AuCT, wherein said AuCT output-controlling device comprises: the signal sampling processing module, it carries out periodically sampling process to the analog signal that is input in the kernel control chip, and continually varying signal is in time converted in time pulse train interrupted, analog signal size in amplitude equals the sampling time; And amplitude and the given module of frequency, according to the result of signal sampling processing module, the amplitude of given output AC signal and frequency.

Further, aforesaid AuCT, wherein said AuCT output-controlling device comprises: static coordinate conversion module, the three-phase output voltage that its sampling obtains, electric current and ac bus voltage are done coordinate transform and are obtained voltage and current value under two phase coordinate systems; The rotating coordinate transformation module, its voltage and current value after by the static coordinate conversion is done coordinate transform and is obtained relatively static DC quantity; And despining coordinate transformation module.Relatively static direct current signal is generated the two-phase AC signal by coordinate transform.

Further, aforesaid AuCT, wherein said AuCT output-controlling device comprises: the phase sequence detection module, it determines the phase sequence of the sine wave that self produces by detecting the phase sequence of AuCT three phase sine ac bus in parallel; And phase-locked loop module, it realizes that by detecting frequency and the phase place of AuCT ac bus in parallel the separate unit AuCT is to the tracking of ac bus phase place in parallel and frequency.

Further, aforesaid AuCT, wherein said AuCT output-controlling device comprises: power computation module, and output voltage and the output current of its self AuCT module of sampling are tried to achieve active power and the reactive power of output by the Power arithmetic algorithm; And the power filtration module, it carries out filtering to active power and the reactive power of trying to achieve by Power arithmetic, obtains active power of output filter value and reactive power filter value.

Further, aforesaid AuCT, wherein said AuCT output-controlling device comprises: the Voltage loop adjustment module.Adopt Increment Type Digital Hydraulic ratio-integral adjustment module regulation output voltage, can stablize the output voltage values that reaches given, and electric current loop adjustable ring module.Adopt Increment Type Digital Hydraulic ratio-integral adjustment module regulation output filter inductance electric current.

Further, aforesaid AuCT, wherein said AuCT output-controlling device comprises: space vector pulse width modulation ripple generation module.Utilize the ageing of the output voltage of AuCT, form polygon voltage vector track, make the voltage vector of AuCT output more approach circle, and finally obtain the sine output voltage waveform.

According to another aspect of the present invention, propose a kind of auxiliary converter control system, comprising: a plurality of aforesaid AuCTs; The direct current inlet highway; And interchange output bus.

According to another aspect of the present invention, a kind of AuCT control method for parallel is proposed, comprise following steps: in each AuCT of described a plurality of AuCTs, the voltage of the input voltage of this AuCT of sampling, output voltage, output current and output AC bus; And the output voltage of controlling the device of described inverter, to realize the Parallel Control of a plurality of AuCTs.

Further, aforesaid AuCT control method for parallel, comprise: in described each AuCT, the phase place by phase-locked loop detection output AC bus makes the output voltage phase place of this AuCT identical with the voltage-phase of output AC bus by control; In described each AuCT, utilize the static coordinate conversion to make the output three-phase alternating voltage of this AuCT convert two-phase alternating current to and press; And in described each AuCT, utilize rotating coordinate transformation that two-phase alternating current is pressed and convert direct current to.

Further, aforesaid AuCT control method for parallel comprises: in described each AuCT, and the active power of output of calculating book AuCT and reactive power; In described each AuCT, the instantaneous active power of output of this AuCT and reactive power are carried out filtering process and wait until the filter value of active power of output and the filter value of reactive power; And in described each AuCT, utilize instantaneous active power of output filter value and the reactive power filter value of this AuCT, by sagging instantaneous output voltage set-point and the phase place set-point that calculates this AuCT.

Further, aforesaid AuCT control method for parallel, comprise: according to the difference of the feedback quantity of the instantaneous value of output voltage set-point and AuCT output voltage, the passing ratio integral control obtains an output valve, the given signal that the output valve of this voltage-regulation is regulated as electric current; And the difference of the feedback quantity of the set-point of regulating according to electric current and AuCT output current, the passing ratio integral control obtains an output valve.

Further, aforesaid AuCT control method for parallel comprises: according to the output valve of current regulator, do the despining coordinate transform and make direct current signal be transformed into the two-phase AC signal; And

According to the two-phase AC signal, by space vector pulse width modulation ripple Risk factor, produce the control signal SVPWM pulse of regulating the AuCT output voltage.

Patent of the present invention provides a kind of AuCT control method for parallel can solve the high-power AuCT centrally connected power supply of separate unit and every joint compartment an AuCT existing problem of powering has been installed, realize redundant power supply, improve reliability and the maintenanceability of auxiliary electric power supply.A plurality of AuCT parallel operations, each AuCT is on average born output power, has fundamentally solved power supply reliability, has reduced cost, is convenient to the expansion capacity, is conducive to shorten produce and the lead time.

Description of drawings

Below, in connection with accompanying drawing preferred implementation of the present invention is described in more detail, wherein:

Fig. 1 is the structural representation of AuCT parallel control system according to an embodiment of the invention;

Fig. 2 is the structural representation of AuCT according to an embodiment of the invention; And

Fig. 3 is the schematic flow sheet of AuCT control method for parallel according to an embodiment of the invention; And

Fig. 4 is frequency and the voltage-regulation characteristic of two different capabilities inverters.

Embodiment

For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.

Design concept of the present invention is in the AuCT parallel system, each AuCT is sampled, is processed the output of current AuCT, and in conjunction with the output voltage sample information of bus in parallel, draw output controlled quentity controlled variable to current AuCT by computing.In the present invention, between each AuCT without information exchange.

AuCT control method for parallel of the present invention, the voltage by detecting the output of other AuCT and current self output voltage and electric current, thus can realize current-sharing with other AuCT, the shared bearing power realizes parallel operation.

Corresponding with method of the present invention, the present invention also provides a kind of AuCT can adopt method of the present invention, output voltage amplitude, phase place, frequency and the phase sequence of each AuCT of control in the AuCT parallel system are to divide equally load.

The AuCT that Fig. 1 provides for one embodiment of the invention and the structural representation of control system thereof.As shown in Figure 1, AuCT parallel system 100 comprises a plurality of AuCTs, for example: AuCT 1, AuCT 2 ..., AuCT n.Each AuCT comprises an inverter, and it is from dc bus V _InReceive high voltage direct current, and be translated into alternating current output (V _Out, I _Out).Output to ac bus from the alternating current of inverter output through behind the output contactor, to provide electric power to load.Each AuCT comprises a control unit, and these control units do not link to each other mutually, without information exchange.The control unit of AuCT is sampled from the output of AuCT and bus, and after sample information processed, produce control signal, and further generate the SVPWM control signal according to control signal, readjust the amplitude of AuCT output voltage, phase place, frequency is to realize in parallel with other AuCT.

The structural representation of the AuCT of the single branch road that Fig. 2 provides for one embodiment of the invention.As shown in Figure 2, the control unit of AuCT comprises with lower module:

--the signal sampling processing module.The analog signal that is input in the kernel control chip is carried out periodically sampling process, continually varying signal is in time converted in time pulse train interrupted, analog signal size in amplitude equals the sampling time.At first be each continuous several times sampling, again maximum and minimum value got rid of, prevent from sampling the spike of signal, and then remaining sampled signal is made to handle averagely that get its mean value, sampling can farthest recover original analog signal without distortion like this.Sample objects comprises input voltage, input current, output voltage, output current, and output AC busbar voltage.According to one embodiment of present invention, the method of sampling can comprise the steps: at first to adopt voltage sensor or current sensor, virtual voltage or actual current are converted to voltage or the current signal of low pressure, secondly voltage or current signal are passed through dividing potential drop, the following sampling modulate circuit converts voltage or current signal to suitable signal and is sent in the controller, the signal storage that in controller sampling is obtained again is in array, store the repeatedly value of sampling in the array, during last each calculating maximum in the array and minimum value are got rid of, and then remaining sampled signal made to handle averagely, get its mean value, namely obtain sampled value.The signal storage that at every turn last samples is obtained is got rid of the signal that at first sampling obtains in array.

--the static coordinate conversion module.Three-phase output voltage, electric current and the ac bus voltage that adopts following formula that sampling is obtained is done coordinate transform and is obtained voltage and current value under two phase coordinate systems.

$\left[\begin{array}{c}\mathrm{\α}\\ \mathrm{\β}\end{array}\right]=\frac{2}{3}\left[\begin{array}{ccc}1& -\frac{1}{2}& -\frac{1}{2}\\ 0& \frac{\sqrt{3}}{2}& -\frac{\sqrt{3}}{2}\end{array}\right]\left[\begin{array}{c}a\\ b\\ c\end{array}\right]$

Wherein, α, β are the voltage and current value under two phase coordinate systems; A, b, c are phase output voltage, electric current and ac bus voltage.

--the rotating coordinate transformation module.Adopt following formula to obtain relatively static DC quantity doing coordinate transform by the voltage and current value after the static coordinate conversion.

$\left[\begin{array}{c}d\\ q\end{array}\right]=\left[\begin{array}{cc}\sin \mathrm{\θ}& -\cos \mathrm{\θ}\\ \cos \mathrm{\θ}& \sin \mathrm{\θ}\end{array}\right]\left[\begin{array}{c}\mathrm{\α}\\ \mathrm{\β}\end{array}\right]$

Wherein, α, β are the voltage and current value under two phase coordinate systems; D, q are relatively static DC quantity.

--the phase sequence detection module.By detecting the phase sequence of AuCT three phase sine ac bus in parallel, determine the phase sequence of the sine wave that self produces.In this programme, realize the judgement of phase sequence with software, the three-phase alternating current signal of telecommunication with sampling, by specific phase sequence detection algorithm, derive phase sequence to be measured and relatively judge its consistency with reference to phase sequence, thereby realize that quick, accurate, reliable and stable phase sequence detects, provide the phase sequence decision signal, its advantage is fast, accurately, flexibly, conveniently.

--phase-locked loop module.Initial same-phase and same frequency when AuCT is in parallel guarantee by phase-locked loop.By frequency and the phase place that detects AuCT ac bus in parallel, can realize fast, reposefully that the separate unit AuCT is to the tracking of ac bus phase place in parallel and frequency.

--power computation module.Output voltage and the output current of AuCT parallel controller real-time sampling self AuCT module are tried to achieve active power and the reactive power of output by the Power arithmetic algorithm.

$\left\{\begin{array}{c}p=u_{\mathrm{\α}}{i}_{\mathrm{\α}}+u_{\mathrm{\β}}{i}_{\mathrm{\β}}\\ q=u_{\mathrm{\α}}{i}_{\mathrm{\β}}-u_{\mathrm{\β}}{i}_{\mathrm{\α}}\end{array}\right.$

Wherein, u _α, u _β, i _α, i _βIt is the voltage and current value under two phase coordinate systems; P, q are active power and the reactive power that calculates.

--the power filtration module.Active power and reactive power that AuCT is tried to achieve by Power arithmetic are carried out filtering, obtain active power of output filter value and reactive power filter value.

y(k)=c ₁*y(k-1)+c ₂*[x(k-1)+x(k)]

Wherein, c ₁, c ₂Be filtering parameter; X (k), x (k-1) is the filter value of input and the filter value of last input; Y (k), y (k-1) is the filter value of output and the filter value of last output.

--the given module of amplitude and frequency.The active power of AuCT output is relevant with the phase angle, and reactive power is relevant with output voltage amplitude, come the phase place of regulation voltage by the fine setting output voltage frequency, realization is to the adjusting of this AuCT active power, thereby reaches the purpose of control AuCT active power of output in parallel equilibrium; The size of the amplitude control reactive power by regulating the AuCT output voltage reaches the purpose of control AuCT output reactive power in parallel equilibrium.Like this, the phase place by adjusting AuCT and the active power that two key elements of output voltage amplitude just can realize AuCT in parallel and the decoupling zero of reactive power are controlled, thereby have realized the sharing control of AuCT.Like this, can control the parallel running of realization AuCT based on the power characteristic of system.

--the Voltage loop adjustment module.Adopt Increment Type Digital Hydraulic ratio-integral adjustment module regulation output voltage, can stablize the output voltage values that reaches given.

$y_k=y_{k-1}+k_p(1+\frac{T_s}{T_i})e_k-k_p*e_{k-1}$

Wherein, k _pBe regulator parameter; T _s, T _iBe adjuster discrete time and the time of integration; e _k, e _K-1Error for adjuster error originated from input and last input; y _k, y _K-1Be adjuster output valve and last output valve.

--electric current loop adjustable ring module.Adopt Increment Type Digital Hydraulic ratio-integral adjustment module regulation output filter inductance electric current.

$y_k=y_{k-1}+k_p(1+\frac{T_s}{T_i})e_k-k_p*e_{k-1}$

Wherein, k _pBe regulator parameter; T _s, T _iBe adjuster discrete time and the time of integration; e _k, e _K-1Error for adjuster error originated from input and last input; y _k, y _K-1Be adjuster output valve and last output valve.

--the despining coordinate transformation module.Relatively static direct current signal is generated the two-phase AC signal by coordinate transform.

$\left[\begin{array}{c}\mathrm{\α}\\ \mathrm{\β}\end{array}\right]=\left[\begin{array}{cc}\cos \mathrm{\θ}& -\sin \mathrm{\θ}\\ \sin \mathrm{\θ}& \cos \mathrm{\θ}\end{array}\right]\left[\begin{array}{c}d\\ q\end{array}\right]$

Wherein, α, β are the voltage and current value under two phase coordinate systems; D, q are relatively static DC quantity.

--space vector pulse width modulation ripple generation module.Utilize the ageing of the output voltage of AuCT, form polygon voltage vector track, make the voltage vector of AuCT output more approach circle, and finally obtain the sine output voltage waveform.

In AuCT control method for parallel of the present invention, described power detection module comprises: for three-phase system, calculate instantaneous active power and reactive power under the dq0 coordinate system.

In AuCT control method for parallel of the present invention, the given module of described amplitude and frequency comprises: the droop control amount that calculates voltage magnitude and angle according to current AuCT output instantaneous active power filter value and reactive power filter value.

The schematic diagram of the control method for parallel of the AuCT that Fig. 3 provides for one embodiment of the invention.As shown in Figure 3, AuCT control method for parallel of the present invention is included in and carries out following steps in each AuCT:

In step 310, the voltage of the input voltage of the current AuCT of sampling, output voltage, output current and output AC bus.

In step 320, whether the output voltage of more current AuCT is consistent with the phase sequence of output AC busbar voltage; If unanimously then parallel operation, report an error otherwise shut down.

In step 330, the phase place by phase-locked loop detection output AC bus makes the output voltage phase place of current AuCT identical with the voltage-phase of output AC bus by control; And, in step 340, utilize the static coordinate conversion to make the output three-phase alternating voltage of current AuCT convert two-phase alternating current to and press; And utilize rotating coordinate transformation to make the two-phase alternating current pressure convert direct current to.

In step 350, calculate active power of output and the reactive power of current AuCT.Instantaneous active power of output and reactive power to current AuCT are carried out the filtering processing, obtain the filter value of active power of output and the filter value of reactive power; And, utilize instantaneous active power of output filter value and the reactive power filter value of current AuCT, by sagging instantaneous output voltage set-point and the phase place set-point that calculates current AuCT.

Frequency during inverter parallel and voltage have sagging characteristic, namely find by the research to the inverter parallel system model, the active power that each inverter module sends in parallel system is relevant with its output voltage phase place, the active power that the leading inversion module of phase place sends is larger, the active power that the inversion module that phase place lags behind sends is less, even absorbs active power; The reactive power that each inverter module sends in parallel system is relevant with its output voltage amplitude, and the inversion module output reactive power that amplitude is larger is larger, and amplitude is less, and to send reactive power less, even absorbing reactive power.

The droop characteristic control mode utilizes this relation to realize parallel connection between the inverter module just, control is to send the output voltage frequency of meritorious larger inversion module less, the meritorious less inversion module output voltage frequency of output is larger, utilize different frequencies to change phase place between the inversion module, final each module phase place reaches unanimity, and the active power of sending equates.

In like manner, also can regulate to realize idle equilibrium by amplitude.When phase place, the amplitude of each inverter in the parallel system differ less, can think that the meritorious circulation of parallel system is relevant with phase difference, and reactive circular power flow is relevant with difference in magnitude, utilize the droop characteristic of inverter output voltage, each inverter is take self meritorious and reactive power as foundation, adjusts the frequency of output voltage and amplitude to reach the current-sharing operation of each inverter.

Can carry out the active power of electric voltage frequency and amplitude and output and the relation between the reactive power by following formula:

$\left\{\begin{array}{c}{f}_i=f_{\mathrm{oi}}-m_i{P}_i\\ V_i=V_{\mathrm{oi}}-n_i{Q}_i\end{array}\right.$

F in the formula _Oi, V _OiRespectively i inversion module output voltage frequency and amplitude, m _i, n _iRespectively i inversion module output voltage frequency attenuation coefficient and amplitude attenuation coefficient, P _i, Q _iRespectively active power and the reactive power of i inversion module output, f _i, V _iRespectively electric voltage frequency and the amplitude of i inversion module requirement output.

If each parallel module output voltage amplitude and frequency are consistent, just can realize each parallel module load-sharing power by sagging computing formula.Fig. 4 shows frequency and the voltage-regulation characteristic of two different capabilities inverters.

In step 360, according to the difference of the feedback quantity of the instantaneous value of output voltage set-point and AuCT output voltage, the passing ratio integral control obtains an output valve, the given signal that the output valve of this voltage-regulation is regulated as electric current;

In step 370, the difference of the set-point of regulating according to electric current and the feedback quantity of AuCT output current, the passing ratio integral control obtains an output valve; According to the output valve of current regulator, do the despining coordinate transform and make direct current signal be transformed into the two-phase AC signal;

In step 380, according to the two-phase AC signal, by space vector pulse width modulation ripple Risk factor, produce the control signal SVPWM pulse of regulating the AuCT output voltage.

Above-described embodiment is only for explanation the present invention's, and be not to be limitation of the present invention, the those of ordinary skill in relevant technologies field, without departing from the present invention, can also make a variety of changes and modification, therefore, all technical schemes that are equal to also should belong to category disclosed by the invention.

Claims (13)

1. AuCT comprises:

Inverter is with converting direct-current power into alternating-current power; And

The AuCT output-controlling device is sampled, is processed the output of described inverter, and in conjunction with the output voltage sample information of bus in parallel, controls the output voltage of the device of described inverter.

2. AuCT according to claim 1, wherein said AuCT output-controlling device comprises:

The signal sampling processing module, it carries out periodically sampling process to the analog signal that is input in the kernel control chip, and continually varying signal is in time converted in time pulse train interrupted, analog signal size in amplitude equals the sampling time; And

The given module of amplitude and frequency, according to the result of signal sampling processing module, the amplitude of given output AC signal and frequency.

3. AuCT according to claim 1, wherein said AuCT output-controlling device comprises:

Static coordinate conversion module, the three-phase output voltage that its sampling obtains, electric current and ac bus voltage are done coordinate transform and are obtained voltage and current value under two phase coordinate systems; And

The rotating coordinate transformation module, its voltage and current value after by the static coordinate conversion is done coordinate transform and is obtained relatively static DC quantity; And

The despining coordinate transformation module.Relatively static direct current signal is generated the two-phase AC signal by coordinate transform.

4. AuCT according to claim 1, wherein said AuCT output-controlling device comprises:

The phase sequence detection module, it determines the phase sequence of the sine wave that self produces by detecting the phase sequence of AuCT three phase sine ac bus in parallel; And

Phase-locked loop module, it realizes that by detecting frequency and the phase place of AuCT ac bus in parallel the separate unit AuCT is to the tracking of ac bus phase place in parallel and frequency.

5. AuCT according to claim 1, wherein said AuCT output-controlling device comprises:

Power computation module, output voltage and the output current of its self AuCT module of sampling are tried to achieve active power and the reactive power of output by the Power arithmetic algorithm; And

The power filtration module, it carries out filtering to active power and the reactive power of trying to achieve by Power arithmetic, obtains active power of output filter value and reactive power filter value.

6. AuCT according to claim 1, wherein said AuCT output-controlling device comprises:

The Voltage loop adjustment module.Adopt Increment Type Digital Hydraulic ratio-integral adjustment module regulation output voltage, can stablize the output voltage values that reaches given, and

Electric current loop adjustable ring module.Adopt Increment Type Digital Hydraulic ratio-integral adjustment module regulation output filter inductance electric current.

7. AuCT according to claim 1, wherein said AuCT output-controlling device comprises:

Space vector pulse width modulation ripple generation module.Utilize the ageing of the output voltage of AuCT, form polygon voltage vector track, make the voltage vector of AuCT output more approach circle, and finally obtain the sine output voltage waveform.

8. auxiliary converter control system comprises:

A plurality of AuCTs as claimed in claim 1;

The direct current inlet highway; And

Exchange the output bus.

9. AuCT control method for parallel comprises following steps:

In each AuCT of described a plurality of AuCTs, the voltage of the input voltage of this AuCT of sampling, output voltage, output current and output AC bus; And

Control the output voltage of the device of described inverter, to realize the Parallel Control of a plurality of AuCTs.

10. such as AuCT control method for parallel according to claim 9, comprising:

In described each AuCT, the phase place by phase-locked loop detection output AC bus makes the output voltage phase place of this AuCT identical with the voltage-phase of output AC bus by control;

In described each AuCT, utilize the static coordinate conversion to make the output three-phase alternating voltage of this AuCT convert two-phase alternating current to and press; And

In described each AuCT, utilize rotating coordinate transformation that two-phase alternating current is pressed and convert direct current to.

11. such as AuCT control method for parallel according to claim 10, comprising:

In described each AuCT, the active power of output of calculating book AuCT and reactive power;

In described each AuCT, the instantaneous active power of output of this AuCT and reactive power are carried out filtering process and wait until the filter value of active power of output and the filter value of reactive power; And

In described each AuCT, utilize instantaneous active power of output filter value and the reactive power filter value of this AuCT, by sagging instantaneous output voltage set-point and the phase place set-point that calculates this AuCT.

12. such as AuCT control method for parallel according to claim 11, comprising:

According to the difference of the feedback quantity of the instantaneous value of output voltage set-point and AuCT output voltage, the passing ratio integral control obtains an output valve, the given signal that the output valve of this voltage-regulation is regulated as electric current; And

The difference of the set-point of regulating according to electric current and the feedback quantity of AuCT output current, the passing ratio integral control obtains an output valve.

13. such as AuCT control method for parallel according to claim 12, comprising:

According to the output valve of current regulator, do the despining coordinate transform and make direct current signal be transformed into the two-phase AC signal; And

According to the two-phase AC signal, by space vector pulse width modulation ripple Risk factor, produce the control signal SVPWM pulse of regulating the AuCT output voltage.

Images