CN104218590B - Unbalance voltage compensating control method based on virtual synchronous machine - Google Patents

Unbalance voltage compensating control method based on virtual synchronous machine Download PDF

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CN104218590B
CN104218590B CN201410458076.9A CN201410458076A CN104218590B CN 104218590 B CN104218590 B CN 104218590B CN 201410458076 A CN201410458076 A CN 201410458076A CN 104218590 B CN104218590 B CN 104218590B
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voltage
omega
control
synchronous machine
virtual synchronous
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CN104218590A (en
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张兴
刘芳
徐海珍
石荣亮
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合肥工业大学
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    • Y02E40/34
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02P80/14District level solutions, i.e. local energy networks

Abstract

The invention discloses a kind of unbalance voltage compensating control method based on virtual synchronous machine。It adopts the power calculation algorithms based on wave trap filtering, to eliminate that low-pass first order filter response speed is slow, poor stability, the problems such as the second harmonic that unbalanced load brings cannot be eliminated, meritorious and the idle general power calculated is as the feed back input of droop control, and the unbalance voltage adoption rate integration produced is added the method a part of unbalance voltage of suppression that resonance controls, simultaneously, adopt a kind of unbalance voltage compensating controller, eliminate unbalanced component further。It can compensate unbalance voltage, can keep again the equal mobility that multi-machine parallel connection is good, and microgrid inverter when can be widely used in unbalanced load controls, to keep output voltage when its off-network is run to balance, and can multiple stage parallel running。

Description

Unbalance voltage compensating control method based on virtual synchronous machine

Technical field

The present invention relates to a kind of unbalance voltage compensating control method, especially a kind of unbalance voltage compensating control method based on virtual synchronous machine。

Background technology

In recent years, virtual synchronous generator techniques, as a kind of novel power generation mode of microgrid inverter, receives a large amount of concerns of scholar。The microgrid inverter adopting virtual synchronous generator techniques is called virtual synchronous electromotor。Virtual synchronous electromotor (VirtualSynchronousGenerator, VSG) needs to run in both modes, grid-connected and isolated island parallel running。

There is substantial amounts of uncompensated load in microgrid, these uncompensated loads can have a strong impact on the output voltage power supply quality of VSG, causes output voltage uneven, thus causing the problems such as electrical equipment overvoltage。In order to reach good output voltage power supply quality, it is desirable to the degree of unbalancedness of output voltage controlled within certain scope, it is maintained with the power-sharing performance that multi-machine parallel connection is good。

For this, people are made that various effort, as being entitled as " Agrid-interfacingpowerqualitycompensatorforthree-phaseth ree-wiremicrogridapplications ", LiYW, VilathgamuwaDM, LohPC, " IEEETransactionsonPowerElectronics ", 2006,21 (4), the article of 1021-1031 (" being applied to the grid-connected power quality compensator of phase three-wire three microgrid ", " IEEE journal-power electronics periodical ", the 21st volume the 4th phase in 2006 1021~1031 pages);This article gives a kind of solution controlling voltage unbalance factor, is increase electric energy quality compensating device APF (ActivePowerFilter) or UPQC at feeder ear, and this control program adds extra device, relatively costly。

It is entitled as " AutonomousvoltageunbalancecompensationinanIslandedDroop-controlledmicrogrid ", SavaghebiM, JalilianA, VasquezJC, etal, " IEEETransactionsonIndustrialElectronics ", 2013,60 (4), 1390-1402 (" being applied to the unbalance voltage automatic compensator of droop control piconet island pattern ", " IEEE journal-industrial electronic periodical ", the 60th volume the 4th phase in 2013 1390~1402 pages) article;This article proposes a kind of resonance potential controller to compensate unbalance voltage, but affects owing to not accounting for the unbalance voltage landing etc. on virtual impedance, and compensation effect is poor。

It is entitled as " Voltageunbalanceandharmonicscompensationforislandedmicro gridinverters ", LiuQ, TaoY, LiuX, etal, " PowerElectronicsIET ", 2014,7 (5), 1055-1063 (" Voltage unbalance of isolated island microgrid inverter and harmonic compensation control ", " IET engineering association-power electronics periodical ", the 7th volume the 5th phase in 2014 1055~1063 pages) article;This article proposes employing multi-resonant controller to suppress Voltage unbalance, but it controls narrower bandwidth, and when micro-grid system frequency changes, compensation effect is poor。

It is entitled as " Amethodofthree-phasebalancinginmicrogridbyphotovoltaicge nerationsystem ", HojoM, IwaseY, FunabashiT, etal, " PowerElectronicsandMotionControlConference2008.EPE-PEMC ", 2008,13th.IEEE, 2008, the article of 2487-2491 (" the three-phase equilibrium control strategy in photovoltaic generation micro-grid system ", " the 13rd power electronics with motor control international conference ", the 13rd phase in 2008 2487~2491 pages);This article proposes and adopts the method injecting negative-sequence current to compensate unbalance voltage, but the injection of negative-sequence current can make microgrid inverter cross conductance to cause shutdown harsh when。

In sum, prior art all fails to solve in microgrid inverter parallel running system, the equal flow problem of inverter parallel during band unbalanced load, when not only can guarantee that degree of balance that output voltage is good but also can guarantee that islet operation。

Summary of the invention

The technical problem to be solved in the present invention is the limitation overcoming above-mentioned various technical scheme, during for virtual synchronous electromotor off-network parallel running, output voltage imbalance problem with unbalanced load, there is provided one can compensate unbalance voltage, the unbalance voltage compensating control method based on virtual synchronous machine of the equal mobility that multi-machine parallel connection is good can be kept again。

For solving the technical problem of the present invention, the technical scheme adopted is: include the collection of microgrid inverter output capacitance voltage based on the unbalance voltage compensating control method of virtual synchronous machine, particularly key step is as follows:

Step 1, first gathers the output capacitance voltage U of microgrid inverterca,Ucb,Ucc, brachium pontis side inductive current Ila,Ilb,IlcWith output electric current Iox, the component U of output capacitance voltage dq is obtained through single synchronous rotating anglecd,Ucq, the component I of brachium pontis side inductive current dqld,IlqComponent I with output electric current dqod,Ioq, recycle output capacitance voltage Uca,Ucb,UccWith brachium pontis side inductive current Ila,Ilb,Ilc, the negative sequence component U of capacitance voltage is obtained through double; two synchronous rotating angleC_N-d,UC_N-qNegative sequence component I with inductive currentL_N-d,IL_N-q

Step 2, the component U according to the output capacitance voltage dq obtained in step 1cd,UcqComponent I with output electric current dqod,Ioq, calculate equation through active power calculating equation and reactive power and obtain average active powerAnd average reactive power

Step 3, according to the average active power obtained in step 2The active power instruction P given with microgrid inverterref, the given angular frequency instruction ω of microgrid inverterref, the angular frequency of virtual synchronous electromotor is obtained through merit angle governing equation, diagonal frequencies ω integration obtains the azimuth θ of virtual synchronous machine;

Step 4, according to the average reactive power obtained in step 2The reactive power instruction Q given with microgrid inverterref, voltage instruction Uref, the terminal voltage U of virtual synchronous machine is obtained through idle governing equation*

Step 5, first according to the terminal voltage U obtained in step 4*With the U obtained in step 1cd,Ucq, obtain capacitance current command signal by Control of Voltage equationFurther according to capacitance current command signalComponent I with the brachium pontis side inductive current dq in step 1ld,IlqComponent I with output electric current dqod,Ioq, obtain control signal U by electric current governing equationd1,Uq1

Step 6, the negative sequence component U according to the capacitance voltage obtained in step 1C_N-d,UC_N-qNegative sequence component I with inductive currentL_N-d,IL_N-q, compensate governing equation through negative sequence voltage and obtain control signal Ud2,Uq2

Step 7, the control signal U that will obtain in step 5 and step 6d1,Uq1And Ud2,Uq2It is separately summed and obtains control signal Ud,Uq

Step 8, first according to the control signal U in step 7d,UqWith the azimuth θ obtained in step 3, obtain three-phase brachium pontis voltage control signal U through single synchronously rotating reference frame inverse transformationa,Ub,Uc, further according to Ua,Ub,UcGenerate the pwm control signal of microgrid inverter converter bridge switching parts pipe。

Further improvement as the unbalance voltage compensating control method based on virtual synchronous machine:

Preferably, the calculating of the active power in step 2 equation is

P ‾ = ( Π h s 2 + ω h 2 s 2 + 2 Qω h s + ω h 2 ) · 1.5 τ s + 1 · ( U c q I o q + U c d I o d ) ,

Wherein, Q is resonant controller quality factor, ωhNeeding the harmonic wave angular frequency that filters, s to be Laplace operator, τ for wave trap is the time constant of low-pass first order filter。

Preferably, the calculating of the reactive power in step 2 equation is

Q ‾ = ( Π h s 2 + ω h 2 s 2 + 2 Qω h s + ω h 2 ) · 1.5 τ s + 1 · ( U c d I o q - U c q I o d ) ,

Wherein, Q is resonant controller quality factor, ωhNeeding the harmonic wave angular frequency that filters, s to be Laplace operator, τ for wave trap is the time constant of low-pass first order filter。

Preferably, the merit angle governing equation in step 3 is

ω = ω r e f + m Jω 0 m s + 1 ( P r e f - P ‾ ) ,

Wherein, ωrefFor the given active power instruction P of microgrid inverterrefTime specified angular frequency, m be that to control sagging coefficient, J be the simulation virtual rotation inertia time constant of synchronous generator unit, ω at merit angle0For electrical network fixed angles frequency。

Preferably, in step 4, idle governing equation is

U * = U r e f + n ( Q r e f - Q ‾ ) ,

Wherein, UrefFor the given reactive power instruction Q of microgrid inverterrefTime specified output capacitance voltage, n be the sagging coefficient of idle control。

Preferably, the Control of Voltage equation in step 5 is

I c d * = ( K p + K i / s + K r s s 2 + 2 Qω 0 s + ( 2 ω 0 ) 2 ) ( U * - U c d ) I c q * = ( K p + K i / s + K r s s 2 + 2 Qω 0 s + ( 2 ω 0 ) 2 ) ( 0 - U c q ) ,

Wherein, KpFor proportional control factor, KiFor integral control coefficient, KrFor resonant controller proportionality coefficient。

Preferably, the electric current governing equation in step 5 is

U d 1 = K ( I c d * - I l d + I o d ) ,

U q 1 = K ( I c q * - I l q + I o q ) ,

Wherein, K is proportional control factor。

Preferably, the compensation of the negative sequence voltage in step 6 governing equation is

U d 2 = K 1 ( 0 - U C _ N - d ) - K 2 ω 0 LI L _ N - q τ s + 1 U q 2 = K 1 ( 0 - U C _ N - q ) + K 2 ω 0 LI L _ N - d τ s + 1 ,

Wherein, K1For voltage compensation coefficient, K2Be microgrid inverter brachium pontis side inductance value, τ for current compensation factor, L it is time constant filter。

Provide the benefit that relative to prior art:

After adopting the present invention, unbalance voltage can compensated during virtual synchronous generator operation, can keep again, on the basis of the equal mobility that multi-machine parallel connection is good, being provided with following advantage:

1. need not increase extra device, reduce the cost manufacturing and running。

2. solve the difficult problem that the unbalance voltage in impedance is landed。

3. only increase a Compensation Control, just solve the problem controlling narrow bandwidth。

4. need not inject negative-sequence current, stop to cross the generation of stream。

Accompanying drawing explanation

Fig. 1 is a kind of basic controlling block diagram of the present invention。

Fig. 2 is the overall control block diagram of the present invention。

Fig. 3 is the topology diagram of virtual synchronous electromotor of the present invention。

Fig. 4 is that in the present invention, method block diagram calculated by average active power and average wattless power meter。

Detailed description of the invention

Below in conjunction with accompanying drawing, the optimal way of the present invention is described in further detail。

Relevant electric parameter during the invention process is provided that

The DC bus-bar voltage Udc of virtual synchronous electromotor is 550V, and output AC line voltage effective value is 380V/50Hz, and rated capacity is 100KW, and alternating voltage filter inductance is 0.5mH, and filter capacitor is 200 μ F。Transformator is the Dyn11 type transformator of 100KVA270/400V。

Referring to Fig. 1, Fig. 2, Fig. 3 and Fig. 4, the implementation process of the present invention is as follows:

Step 1, first gathers the output capacitance voltage U of microgrid inverterca,Ucb,Ucc, brachium pontis side inductive current Ila,Ilb,IlcWith output electric current Iox, the component U of output capacitance voltage dq is obtained through single synchronous rotating anglecd,Ucq, the component I of brachium pontis side inductive current dqld,IlqComponent I with output electric current dqod,Ioq。Recycling output capacitance voltage Uca,Ucb,UccWith brachium pontis side inductive current Ila,Ilb,Ilc, the negative sequence component U of capacitance voltage is obtained through double; two synchronous rotating angleC_N-d,UC_N-qNegative sequence component I with inductive currentL_N-d,IL_N-q

Step 2, the component U according to the output capacitance voltage dq obtained in step 1cd,UcqComponent I with output electric current dqod,Ioq, calculate equation through active power calculating equation and reactive power and obtain average active powerAnd average reactive powerWherein,

Active power calculates equation

P ‾ = ( Π h s 2 + ω h 2 s 2 + 2 Qω h s + ω h 2 ) · 1.5 τ s + 1 · ( U c q I o q + U c d I o d ) ,

Q therein is resonant controller quality factor, ωhNeeding the harmonic wave angular frequency that filters, s to be Laplace operator, τ for wave trap is the time constant of low-pass first order filter;

Reactive power calculates equation

Q ‾ = ( Π h s 2 + ω h 2 s 2 + 2 Qω h s + ω h 2 ) · 1.5 τ s + 1 · ( U c d I o q - U c q I o d ) ,

Q therein is resonant controller quality factor, ωhNeeding the harmonic wave angular frequency that filters, s to be Laplace operator, τ for wave trap is the time constant of low-pass first order filter。

In the present embodiment, it is considered to the overtone order mainly filtered is 2 times and 3 subharmonic, therefore chooses h=2,3, now ωh=628.3186rad/s, 942.4779rad/s low-pass first order filter mainly considers to filter higher hamonic wave, and does not affect dynamic response, generally takes τ≤2e-3S, present case value τ=1.5e-4S;Quality factor q mainly considers the filter effect of wave trap, in present case, chooses Q=0.5;

The computing block diagram of average active power and average reactive power is as shown in Figure 4。

Step 3, according to the average active power obtained in step 2The active power instruction P given with microgrid inverterref, the given angular frequency instruction ω of microgrid inverterref, the angular frequency of virtual synchronous electromotor is obtained through merit angle governing equation, diagonal frequencies ω integration obtains the azimuth θ of virtual synchronous machine;Wherein,

Merit angle governing equation is

ω = ω r e f + m Jω 0 m s + 1 ( P r e f - P ‾ ) ,

ω thereinrefFor the given active power instruction P of microgrid inverterrefTime specified angular frequency, m be that to control sagging coefficient, J be the simulation virtual rotation inertia time constant of synchronous generator unit, ω at merit angle0For electrical network fixed angles frequency。

Merit angle governing equation indicates microgrid inverter active power sagging curve relation and virtual inertia size。Wherein, virtual inertia designates the rate of change of system frequency, in order to ensure system frequency change steadily, it is desirable to have bigger virtual inertia;But virtual inertia is equivalent to add in systems first order inertial loop, too big virtual inertia is likely to result in the instability of system。Thus parameter selects to need compromise to process。For ensureing system stability, in the present embodiment, inertia time constant scope is at τvirtual=J ω0m≤2e-3S;Active power sagging curve relation in the governing equation of merit angle includes three coefficients, and merit angle controls sagging Coefficient m and represents the slope of sagging curve, when value principle is the active power change of 100%, within frequency change 0.5Hz;Given active power instruction PrefWith corresponding specified angular frequencyrefRepresenting the position relationship of sagging curve, main consideration microgrid inverter active power of output is PrefTime, its output frequency size;

In the present embodiment, electrical network angular frequency adopts the angular frequency that rated frequency is corresponding when being 50Hz, i.e. ω0=314.1593rad/s, merit angle controls sagging coefficient value and isτ is taken according to inertia time constant value principlevirtual=J ω0M=1.5e-3S, can obtain J=0.2Kg m2, during for ensureing to control to run, energy does not flow to DC side, and given active power instruction value is Pref=1KW, now corresponding specified angular frequency value is ωref=314.1593rad/s;

Step 4, according to the average reactive power obtained in step 2The reactive power instruction Q given with microgrid inverterref, voltage instruction Uref, the terminal voltage U of virtual synchronous machine is obtained through idle governing equation*;Wherein,

Idle governing equation is

U * = U r e f + n ( Q r e f - Q ‾ ) ,

U thereinrefFor the given reactive power instruction Q of microgrid inverterrefTime specified output capacitance voltage, n be the sagging coefficient of idle control。

When the sagging coefficient n value principle of idle control is the reactive power change of 100%, voltage magnitude changes within 2%;Given reactive power instruction QrefWith corresponding specified output capacitance voltage UrefRepresenting the position relationship of sagging curve, main consideration microgrid inverter output reactive power is QrefTime, its output voltage size;

In the present embodiment, the sagging coefficient n value of idle control isGiven reactive power instruction QrefConsideration system output reactive power is Qref=0, now corresponding specified output capacitance voltage Uref=380V;

Step 5, first according to the terminal voltage U obtained in step 4*With the U obtained in step 1cd,Ucq, obtain capacitance current command signal by Control of Voltage equationWherein,

Control of Voltage equation is

I c d * = ( K p + K i / s + K r s s 2 + 2 Qω 0 s + ( 2 ω 0 ) 2 ) ( U * - U c d ) I c q * = ( K p + K i / s + K r s s 2 + 2 Qω 0 s + ( 2 ω 0 ) 2 ) ( 0 - U c q ) ,

K thereinpFor proportional control factor, KiFor integral control coefficient, KrFor resonant controller proportionality coefficient。

Further according to capacitance current command signalComponent I with the brachium pontis side inductive current dq in step 1ld,IlqComponent I with output electric current dqod,Ioq, obtain control signal U by electric current governing equationd1,Uq1;Wherein,

Electric current governing equation is

U d 1 = K ( I c d * - I l d + I o d ) ,

U q 1 = K ( I c q * - I l q + I o q ) ,

K therein is proportional control factor。

Parameter in voltage and current governing equation mainly considers the stability of control system and dynamic steady-state behaviour;In the present embodiment, K is takenp=0.03, Ki=0.8, Kr=120, Q=16, K=0.05;

The control process of step 1~5 can referring to Fig. 1。

Step 6, the negative sequence component U according to the capacitance voltage obtained in step 1C_N-d,UC_N-qNegative sequence component I with inductive currentL_N-d,IL_N-q, compensate governing equation through negative sequence voltage and obtain control signal Ud2,Uq2;Wherein,

Negative sequence voltage compensates governing equation

U d 2 = K 1 ( 0 - U C _ N - d ) - K 2 ω 0 LI L _ N - q τ s + 1 U q 2 = K 1 ( 0 - U C _ N - q ) + K 2 ω 0 LI L _ N - d τ s + 1 ,

K therein1For voltage compensation coefficient, K2Be microgrid inverter brachium pontis side inductance value, τ for current compensation factor, L it is time constant filter。

Penalty coefficient mainly considers the effectiveness that dynamic output impedance compensates, general value 0.5≤K1=K2≤ 1。In order to filter the negative sequence component U of capacitance voltageC_N-d,UC_N-qNegative sequence component I with inductive currentL_N-d,IL_N-qHarmonic component, it is considered to the timeconstantτ≤2e of low-pass first order filter-3S。In the present embodiment, K is taken1=K2=1, τ=0.0015。

Step 7, the control signal U that will obtain in step 5 and step 6d1,Uq1And Ud2,Uq2It is separately summed and obtains control signal Ud,Uq

Step 8, first according to the control signal U in step 7d,UqWith the azimuth θ obtained in step 3, obtain three-phase brachium pontis voltage control signal U through single synchronously rotating reference frame inverse transformationa,Ub,Uc, further according to Ua,Ub,UcGenerate the pwm control signal of microgrid inverter converter bridge switching parts pipe。

Obviously, the unbalance voltage compensating control method based on virtual synchronous machine of the present invention can be carried out various change and modification without deviating from the spirit and scope of the present invention by those skilled in the art。So, if these amendments and modification to the present invention belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these and changes and modification。

Claims (8)

1. based on a unbalance voltage compensating control method for virtual synchronous machine, including the collection of microgrid inverter output capacitance voltage, it is characterised in that key step is as follows:
Step 1, first gathers the output capacitance voltage U of microgrid inverterca,Ucb,Ucc, brachium pontis side inductive current Ila,Ilb,IlcWith output electric current Iox, the component U of output capacitance voltage dq is obtained through single synchronous rotating anglecd,Ucq, the component I of brachium pontis side inductive current dqld,IlqComponent I with output electric current dqod,Ioq, recycle output capacitance voltage Uca,Ucb,UccWith brachium pontis side inductive current Ila,Ilb,Ilc, the negative sequence component U of capacitance voltage is obtained through double; two synchronous rotating angleC_N-d,UC_N-qNegative sequence component I with inductive currentL_N-d,IL_N-q
Step 2, the component U according to the output capacitance voltage dq obtained in step 1cd,UcqComponent I with output electric current dqod,Ioq, calculate equation through active power calculating equation and reactive power and obtain average active powerAnd average reactive power
Step 3, according to the average active power obtained in step 2The active power instruction P given with microgrid inverterref, the given angular frequency instruction ω of microgrid inverterref, the angular frequency of virtual synchronous machine is obtained through merit angle governing equation, diagonal frequencies ω integration obtains the azimuth θ of virtual synchronous machine;
Step 4, according to the average reactive power obtained in step 2The reactive power instruction Q given with microgrid inverterref, voltage instruction Uref, the terminal voltage U of virtual synchronous machine is obtained through idle governing equation*
Step 5, first according to the terminal voltage U obtained in step 4*With the U obtained in step 1cd,Ucq, obtain capacitance current command signal by Control of Voltage equationFurther according to capacitance current command signalComponent I with the brachium pontis side inductive current dq in step 1ld,IlqComponent I with output electric current dqod,Ioq, obtain control signal U by electric current governing equationd1,Uq1
Step 6, the negative sequence component U according to the capacitance voltage obtained in step 1C_N-d,UC_N-qNegative sequence component I with inductive currentL_N-d,IL_N-q, compensate governing equation through negative sequence voltage and obtain control signal Ud2,Uq2
Step 7, the control signal U that will obtain in step 5 and step 6d1,Uq1And Ud2,Uq2It is separately summed and obtains control signal Ud,Uq
Step 8, first according to the control signal U in step 7d,UqWith the azimuth θ obtained in step 3, obtain three-phase brachium pontis voltage control signal U through single synchronously rotating reference frame inverse transformationa,Ub,Uc, further according to Ua,Ub,UcGenerate the pwm control signal of microgrid inverter converter bridge switching parts pipe。
2. the unbalance voltage compensating control method based on virtual synchronous machine according to claim 1, is characterized in that the active power in step 2 calculates equation and is
P ‾ = ( Π h s 2 + ω h 2 s 2 + 2 Qω h s + ω h 2 ) · 1.5 τ s + 1 · ( U c q I o q + U c d I o d ) ,
Wherein, Q is resonant controller quality factor, ωhNeeding the harmonic wave angular frequency that filters, s to be Laplace operator, τ for wave trap is the time constant of low-pass first order filter。
3. the unbalance voltage compensating control method based on virtual synchronous machine according to claim 1, is characterized in that the reactive power in step 2 calculates equation and is
Q ‾ = ( Π h s 2 + ω h 2 s 2 + 2 Qω h s + ω h 2 ) · 1.5 τ s + 1 · ( U c d I o q - U c q I o d ) ,
Wherein, Q is resonant controller quality factor, ωhNeeding the harmonic wave angular frequency that filters, s to be Laplace operator, τ for wave trap is the time constant of low-pass first order filter。
4. the unbalance voltage compensating control method based on virtual synchronous machine according to claim 1, the merit angle governing equation that it is characterized in that in step 3 is
ω = ω r e f + m Jω 0 m s + 1 ( P r e f - P ‾ ) ,
Wherein, ωrefFor the given active power instruction P of microgrid inverterrefTime specified angular frequency, m be that to control sagging coefficient, J be the simulation virtual rotation inertia time constant of synchronous generator unit, ω at merit angle0For electrical network fixed angles frequency, s is Laplace operator。
5. the unbalance voltage compensating control method based on virtual synchronous machine according to claim 1, is characterized in that in step 4, idle governing equation is
U * = U r e f + n ( Q r e f - Q ‾ ) ,
Wherein, UrefFor the given reactive power instruction Q of microgrid inverterrefTime specified output capacitance voltage, n be the sagging coefficient of idle control。
6. the unbalance voltage compensating control method based on virtual synchronous machine according to claim 1, the Control of Voltage equation that it is characterized in that in step 5 is
I c d * = ( K p + K i / s + K r s s 2 + 2 Qω 0 s + ( 2 ω 0 ) 2 ) ( U * - U c d ) I c q * = ( K p + K i / s + K r s s 2 + 2 Qω 0 s + ( 2 ω 0 ) 2 ) ( 0 - U c q ) ,
Wherein, KpFor proportional control factor, KiFor integral control coefficient, KrFor resonant controller proportionality coefficient, s is Laplace operator。
7. the unbalance voltage compensating control method based on virtual synchronous machine according to claim 1, the electric current governing equation that it is characterized in that in step 5 is
U d 1 = K ( I c d * - I l d + I o d )
U q 1 = K ( I c q * - I l q + I o q ) ,
Wherein, K is proportional control factor。
8. the unbalance voltage compensating control method based on virtual synchronous machine according to claim 1, is characterized in that the negative sequence voltage in step 6 compensates governing equation and is
U d 2 = K 1 ( 0 - U C _ N - d ) - K 2 ω 0 LI L _ N - q τ s + 1 U q 2 = K 1 ( 0 - U C _ N - q ) + K 2 ω 0 LI L _ N - d τ s + 1 ,
Wherein, K1For voltage compensation coefficient, K2Be microgrid inverter brachium pontis side inductance value, τ for current compensation factor, L being time constant filter, s is Laplace operator。
CN201410458076.9A 2014-09-10 2014-09-10 Unbalance voltage compensating control method based on virtual synchronous machine CN104218590B (en)

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