CN102983620B - A kind of AuCT and control method for parallel thereof - Google Patents

Abstract

A kind of AuCT, comprising: inverter, by converting direct-current power into alternating-current power; And 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, controls the output voltage of the device of described inverter.This AuCT is suitable for the application of locomotive, motor train unit, subway and inter-city train.

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 EMU be by 3000 of traction convertor intermediate link volts of (V) DC inverters is 3 phase 440V, 60 hertz (Hz) alternating current and to the threephase load on EMU and charger etc. power supply power electronic equipment.AuCT is the main power supply unit on EMU, is related to the runnability of EMU, and require that output power is large, reliability is high, and the feasibility therefore improving power supply is extremely important.

High-power AuCT electric power system has two kinds of constituted modes: one is adopt the high-power AuCT centrally connected power supply of separate unit, and two is adopt often joint compartment to install an AuCT to power to this compartment.There is following shortcoming in separate unit high-power AuCT central power supply system: one is that the cost of high-power converter is high; Two is that volume, weight are large, installs difficulty; Three is poor reliability, and Single Point of Faliure will make systemic breakdown.Often save compartment an AuCT is installed powers to this compartment, system is installed complicated, poor reliability.

Existing AuCT also also exists very large shortcoming.Become when what AuCT exported is and the positive and negative sine wave alternately changed, need to control the same amplitude of sine wave output, same frequency, same-phase and same phase sequence time in parallel simultaneously.In parallel system, if the sine wave that AuCT exports is same amplitude, same frequency, synchronous, but phase sequence is not identical, then cannot realize parallel connection.If the sine wave that AuCT exports is same amplitude, same frequency and with phase sequence, but there is phase difference, so part AuCT is operated in rectification state, forms larger circulation.If the sine wave that AuCT exports is same-phase, same frequency and with phase sequence, but amplitude is different, so part AuCT both powered to the load, and powered again to other AuCT.In addition, even if the same amplitude of sine wave, same frequency, same-phase and same phase sequence that AuCT exports, but the multifrequency sinusoid content exported separately there are differences, and at this moment there is harmonic circulating current between each AuCT.Therefore the control of AuCT parallel system and design quite complicated.At present, technically in the urgent need to a kind of converter topology being suitable for applying 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, comprising: inverter, by converting direct-current power into alternating-current power; And 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, controls the output voltage of the device of described inverter.

Further, AuCT as above, wherein said AuCT output-controlling device comprises: signal sampling processing module, it carries out periodically sampling process to the analog signal be input in kernel control chip, and continually varying signal is in time converted to interrupted, the pulse train that equals analog signal size in the sampling time in amplitude in 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, AuCT as above, 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 do coordinate transform obtain two phase coordinate systems under voltage and current value; Rotating coordinate transformation module, its converted by static coordinate after voltage and current value do the DC quantity that coordinate transform obtains geo-stationary; And despining coordinate transformation module.The direct current signal of geo-stationary is generated two-phase AC signal by coordinate transform.

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

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

Further, AuCT as above, wherein said AuCT output-controlling device comprises: Voltage loop adjustment module.Adopt Increment Type Digital Hydraulic proportional, integral adjustment module regulation output voltage, can stablize and reach given output voltage values, and electric current loop adjustable ring module.Adopt Increment Type Digital Hydraulic proportional, integral adjustment module regulation output filter inductance electric current.

Further, AuCT as above, 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, the voltage vector that AuCT is exported is more close to circular, and final acquisition sine output voltage waveform.

According to another aspect of the present invention, propose a kind of auxiliary converter control system, comprising: multiple AuCT as above; Direct current inlet highway; And exchange 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 multiple AuCT, 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 device of described inverter, to realize the Parallel Control of multiple AuCT.

Further, AuCT control method for parallel as above, comprise: in each AuCT described, detected the phase place of output AC bus by phase-locked loop, by controlling to make the output voltage phase place of this AuCT identical with the voltage-phase of output AC bus; In each AuCT described, utilize static coordinate to convert and make the output three-phase alternating voltage of this AuCT convert two-phase alternating current pressure to; And in each AuCT described, utilize rotating coordinate transformation to make two-phase alternating current pressure convert direct current to.

Further, AuCT control method for parallel as above, comprising: in each AuCT described, calculates active power of output and the reactive power of this AuCT; In each AuCT described, filtering process is carried out to the instantaneous active power of output of this AuCT and reactive power and waits until the filter value of active power of output and the filter value of reactive power; And in each AuCT described, utilize instantaneous active power of output filter value and the reactive power filter value of this AuCT, by sagging the instantaneous output voltage set-point and the phase place set-point that calculate this AuCT.

Further, AuCT control method for parallel as above, comprise: according to the difference of the instantaneous value of output voltage set-point and the feedback quantity of AuCT output voltage, passing ratio integral control obtains an output valve, and the output valve of this voltage-regulation is as the Setting signal of Current adjustment; And according to the difference of the set-point of Current adjustment and the feedback quantity of AuCT output current, passing ratio integral control obtains an output valve.

Further, AuCT control method for parallel as above, comprising: according to the output valve of current regulator, does despining coordinate transform and makes direct current signal be transformed into two-phase AC signal; And

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

Patent of the present invention provide a kind of AuCT control method for parallel can solve the high-power AuCT centrally connected power supply of separate unit and often save compartment an AuCT power supply station Problems existing is installed, realize redundant power supply, improve reliability and the maintenanceability of auxiliary electric power supply.Multiple AuCT parallel operation, each AuCT on average bears output power, fundamentally solves the reliability of power supply, reduces cost, is convenient to expansion capacity, is conducive to shortening producing and the lead time.

Accompanying drawing explanation

Below, will be described in more detail the preferred embodiment of the present invention by reference to the accompanying drawings, 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 the frequency and voltage regulating characteristics of two different capabilities inverters.

Embodiment

For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.

Design concept of the present invention is in AuCT parallel system, the output of each AuCT to current AuCT is sampled, is processed, and in conjunction with the output voltage sample information of bus in parallel, draw the 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, by detect voltage that other AuCT exports and current self output voltage and electric current, thus can realize current-sharing with other AuCT, 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, the output voltage amplitude of each AuCT, phase place, frequency and phase sequence is controlled, to divide equally load in AuCT parallel system.

The structural representation of the AuCT that Fig. 1 provides for one embodiment of the invention and control system thereof.As shown in Figure 1, AuCT parallel system 100 comprises multiple AuCT, such as: 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).The alternating current exported from inverter outputs to ac bus, to provide electric power to load after output contactor.Each AuCT comprises a control unit, and these control units are not connected mutually, without information exchange.The control unit of AuCT is sampled from the output and bus of AuCT, and after sample information is processed, produce control signal, and generate SVPWM control signal according to control signal further, readjust the amplitude of AuCT output voltage, phase place, frequency, in parallel with what realize 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:

--signal sampling processing module.Periodically sampling process is carried out to the analog signal be input in kernel control chip, continually varying signal is in time converted to interrupted, the pulse train that equals analog signal size in the sampling time in amplitude in time.First be the sampling of each continuous several times, then maximum and minimum value are got rid of, prevent the spike sampling signal, and then remaining sampled signal is made handling averagely, get its mean value, sampling farthest can 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: 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, following sampling modulate circuit converts voltage or current signal to suitable signal and is sent in controller, the signal storage obtained sampling in the controller is again in array, the value of multiple repairing weld is stored in array, during last each calculating, maximum in array and minimum value are got rid of, and then remaining sampled signal is made handling averagely, get its mean value, namely sampled value is obtained.The signal storage at every turn last samples obtained is in array, and sampling at first, the signal obtained is got rid of.

--static coordinate conversion module.Adopt following formula that the sample three-phase output voltage, electric current and the ac bus voltage that obtain are done the voltage and current value that coordinate transform obtains 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.

--rotating coordinate transformation module.Adopt following formula that the voltage and current value after being converted by static coordinate is done the DC quantity that coordinate transform obtains geo-stationary.

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

Wherein, α, β are the voltage and current value under two phase coordinate systems; D, q are the DC quantity of geo-stationary.

--Phase sequence detection module.By detecting the phase sequence of parallel connection auxiliary converter three phase sine ac bus, determine the phase sequence of the sine wave self produced.In this programme, the judgement of phase sequence is realized with software, by the three-phase alternating current signal of telecommunication of sampling, by specific Phase sequence detection algorithm, derive phase sequence to be measured and its consistency of reference phase sequence multilevel iudge, thus realize quick, accurate, reliable and stable Phase sequence detection, provide phase sequence decision signal, its advantage is fast, accurately, flexibly, conveniently.

--phase-locked loop module.Initial same-phase when AuCT is in parallel and same frequency are ensured by phase-locked loop.By detecting frequency and the phase place of parallel connection auxiliary converter ac bus, the tracking of separate unit AuCT to ac bus phase place in parallel and frequency can be realized fast, reposefully.

--power computation module.The output voltage of AuCT parallel controller real-time sampling self auxiliary current transformer module and output current, try to achieve active power and the reactive power of output by 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 the active power and reactive power that calculate.

--power filter module.The active power of being tried to achieve by Power arithmetic AuCT and reactive power carry 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 ₂for filtering parameter; X (k), x (k-1) are the filter value of input and the filter value of last input; Y (k), y (k-1) are the filter value and the last filter value exported that export.

--amplitude and the given module of frequency.The active power that AuCT exports is relevant with phase angle, and reactive power is relevant with output voltage amplitude, the phase place of regulation voltage is carried out by fine setting output voltage frequency, realize the adjustment to this AuCT active power, thus reach the object controlling the equilibrium of parallel connection auxiliary converter active power of output; By the size regulating the amplitude of AuCT output voltage to control reactive power, reach the object controlling the equilibrium of parallel connection auxiliary converter output reactive power.Like this, just can realize the active power of parallel connection auxiliary converter and the uneoupled control of reactive power by the phase place and output voltage amplitude two key elements adjusting AuCT, thus achieve the sharing control of AuCT.Like this, the power characteristic based on system can the parallel running of control realization AuCT.

--Voltage loop adjustment module.Adopt Increment Type Digital Hydraulic proportional, integral adjustment module regulation output voltage, can stablize and reach given output voltage values.

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

Wherein, k _pfor regulator parameter; T _s, T _ifor adjuster discrete time and the time of integration; e _k, e _k-1for adjuster error originated from input and the last error inputted; y _k, y _k-1for adjuster output valve and last output valve.

--electric current loop adjustable ring module.Adopt Increment Type Digital Hydraulic proportional, 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 _pfor regulator parameter; T _s, T _ifor adjuster discrete time and the time of integration; e _k, e _k-1for adjuster error originated from input and the last error inputted; y _k, y _k-1for adjuster output valve and last output valve.

--despining coordinate transformation module.The direct current signal of geo-stationary is generated 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 the DC quantity of geo-stationary.

--space vector pulse width modulation ripple generation module.Utilize the ageing of the output voltage of AuCT, form polygon voltage vector track, the voltage vector that AuCT is exported is more close to circular, and final acquisition sine output voltage waveform.

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

In AuCT control method for parallel of the present invention, described amplitude and the given module of frequency comprise: the droop control amount calculating 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 each AuCT and carries out following steps:

In step 310, the voltage of the input voltage of 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 consistent, parallel operation, otherwise shutdown reports an error.

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

In step 350, calculate active power of output and the reactive power of current AuCT.Filtering process is carried out to the instantaneous active power of output of current AuCT and reactive power, obtains the filter value of active power of output and the filter value of reactive power; Further, instantaneous active power of output filter value and the reactive power filter value of current AuCT is utilized, by sagging the instantaneous output voltage set-point and the phase place set-point that calculate current AuCT.

Frequency and voltage during inverter parallel has sagging characteristic, namely by finding the research of 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 advanced inversion module of phase place sends is larger, the active power that the inversion module of delayed phase 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 comparatively large, and it is less that what amplitude was less send reactive power, even absorbing reactive power.

Droop characteristic control mode utilizes this relation to realize the parallel connection between inverter module just, the output voltage frequency controlling to make to send meritorious larger inversion module is less, export meritorious less inversion module output voltage frequency larger, utilize different frequencies to change the phase place between inversion module, final each module phase place reaches unanimity, and the active power sent is equal.

In like manner, also can be regulated by amplitude and realize idle equilibrium.When each inverter in parallel system phase place, amplitude difference less time, 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 with the meritorious of self and reactive power for foundation, and the frequency of adjustment output voltage and amplitude are run with the current-sharing reaching each inverter.

The relation between the active power of electric voltage frequency and amplitude and output and reactive power can be carried out 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 formula _oi, V _oii-th inversion module output voltage frequency and amplitude respectively, m _i, n _ii-th inversion module output voltage frequency attenuation coefficient and amplitude attenuation coefficient respectively, P _i, Q _iactive power and the reactive power of i-th inversion module output respectively, f _i, V _ielectric voltage frequency and the amplitude of i-th inversion module requirement output respectively.

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

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

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

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

Above-described embodiment is used for illustrative purposes only, and be not limitation of the present invention, the those of ordinary skill of relevant technical field, without departing from the present invention, can also make a variety of changes and modification, therefore, all equivalent technical schemes also should belong to category disclosed by the invention.

Claims (7)

1. an AuCT, comprising:

Inverter, by converting direct-current power into alternating-current power; And

AuCT output-controlling device, samples to the output of described inverter, processes, and in conjunction with the output voltage sample information of bus in parallel, controls the output voltage of described AuCT,

Wherein said AuCT output-controlling device comprises:

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

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

Rotating coordinate transformation module, its converted by static coordinate after voltage and current value do the DC quantity that coordinate transform obtains geo-stationary;

Despining coordinate transformation module, generates two-phase AC signal the direct current signal of geo-stationary by coordinate transform;

Phase sequence detection module, it, by detecting the phase sequence of parallel connection auxiliary converter three phase sine ac bus, determines the phase sequence of the sine wave self produced;

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

Power computation module, the output voltage of its self auxiliary current transformer module of sampling and output current, try to achieve active power and the reactive power of output by Power arithmetic algorithm;

Power filter module, it carries out filtering to the active power of being tried to achieve by Power arithmetic and reactive power, obtains active power of output filter value and reactive power filter value;

Voltage loop adjustment module, adopts Increment Type Digital Hydraulic proportional, integral adjustment module regulation output voltage, can stablize and reach given output voltage values;

Electric current loop adjustable ring module, adopts Increment Type Digital Hydraulic proportional, integral adjustment module regulation output filter inductance electric current; And

Space vector pulse width modulation ripple generation module, utilize the ageing of the output voltage of AuCT, form polygon voltage vector track, the voltage vector that AuCT is exported is more close to circular, and final acquisition sine output voltage waveform, its two-phase AC signal generated according to described despining coordinate transformation module produces the control signal SVPWM pulse regulating AuCT output voltage.

2. an auxiliary converter control system, comprising:

Multiple AuCT as claimed in claim 1;

Direct current inlet highway; And

Exchange and export bus.

3. the AuCT control method for parallel utilizing auxiliary converter control system as claimed in claim 2 to carry out, comprises following steps:

In each AuCT of described multiple AuCT, 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 described AuCT, to realize the Parallel Control of multiple AuCT.

4., as AuCT control method for parallel according to claim 3, comprising:

In each AuCT described, detected the phase place of output AC bus by phase-locked loop, by controlling to make the output voltage phase place of this AuCT identical with the voltage-phase of output AC bus;

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

In each AuCT described, rotating coordinate transformation is utilized to make two-phase alternating current pressure convert direct current to.

5., as AuCT control method for parallel according to claim 4, comprising:

In each AuCT described, calculate active power of output and the reactive power of this AuCT;

In each AuCT described, filtering process is carried out to the instantaneous active power of output of this AuCT and reactive power and obtains the filter value of active power of output and the filter value of reactive power; And

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

6., as AuCT control method for parallel according to claim 5, comprising:

According to the difference of the instantaneous value of output voltage set-point and the feedback quantity of AuCT output voltage, passing ratio integral control obtains an output valve, and the output valve of this voltage-regulation is as the Setting signal of Current adjustment; And

According to the difference of the set-point of Current adjustment and the feedback quantity of AuCT output current, passing ratio integral control obtains an output valve.

7., as AuCT control method for parallel according to claim 6, comprising:

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

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