高谐波电网工况下光伏逆变器控制策略研究

RenewableEnergyResources

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Vol.37No.11Nov.2019

高谐波电网工况下光伏逆变器控制策略研究

霍现旭1袁赵长伟2袁张慧颖2袁何桂欣3袁赵治国4袁李练兵3渊1.3.摘要院袁袁袁曰袁袁袁曰袁300130曰2.袁袁袁袁300130曰4.袁遥袁曰遥300130冤袁300250曰袁遥PR渊ProportionResonant袁PR冤Matlab/

Simulink遥关键词院PR中图分类号院TK81文献标志码院A文章编号院1671-5292渊2019冤11-1679-06

0

前言

渊PhotoVoltaic袁PV冤袁尧袁袁遥袁渊TotalHarmonicCurrentDistortion袁THD冤[1]遥

袁遥袁袁曰袁[2]遥[3]PR袁袁遥[4]PR袁袁遥[5]袁袁袁遥[6]PR袁PR袁袁袁THD遥

遥袁袁袁袁袁尧袁遥

1光伏逆变器的数学模型

LCL袁380V袁1遥

S1S2S3aUdcS4淄1ai1a

L1R1ucbiccicbCucc

uca

L2PR袁Boost-

+Cdc+

-

R2bS5S6c淄1ci1c

淄1bi1b

i2aUgai2bUgbi2cUgc

ica

院Udc曰Cdc曰S1~S6曰淄1a袁淄1b袁淄1c曰i1a袁i1b袁i1c曰i2a袁i2b袁i2c曰ica袁icb袁iccC曰图1LCL型光伏并网逆变器拓扑结构Fig.1TopologyofLCL-typegrid-connected

photovoltaicinverters

收稿日期院2019-01-23遥

基金项目院渊KJ18-1-24冤遥作者简介院渊1986-冤袁袁袁袁尧遥E-mail院hulxianxu@163.com

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2019袁37渊11冤

U曰RLga袁袁LUgb袁Ugc121袁R2LCL2遥

遥

Vg渊s冤

Ifer渊s冤-

+

G+

-

1/L-

i渊s冤

-

Ginv(s)1s

-

1/Cs

1/L2s

iL2渊s冤

Hi1(s)H渊a冤LCLi2(s)

Vg渊s冤

Ifer渊s冤+

+

-

渊s冤

i-

GX1渊s冤GX2L2渊s冤

Hi2图2LCL型并网逆变器双闭环控制及其

渊b冤渊s冤

Fig.2DoubleLCLclosed等效变换框图

typegrid-connectedloopcontrolblockinverter

diagramof

院曰Gs冤曰GHs冤inv渊s冤袁[7]i渊曰H2尧i1i2渊渊s冤袁院

遥

GX1渊s冤=LG1Cs2冤=

+iG渊sinv冤(Gs)invH(i1s()s)+1渊1冤GX2渊sLCCs2s2+1渊2冤

T渊s冤=GiX1L2渊s冤GX2渊s冤Hi2渊s冤渊3冤

iL2=H1T渊s)Gi2渊s)1+T渊s冤ifer渊s冤-1+TX2渊渊ss冤冤淄g渊s冤=iS渊s冤+淄Zg0渊渊ss冤冤院iS渊s冤袁渊4冤iS渊s冤=

H1T渊s)i2渊s)1+T渊si渊s冤

渊5冤院Z0渊s冤冤fer1袁Z0渊s冤=

G+TX2渊渊ss冤冤渊6冤

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2逆变器电网电压全前馈控制的优化渊4冤袁袁袁袁袁遥袁袁遥袁袁3遥

Vg渊s冤Ifer渊s冤+

+1/GX1渊s冤i-GX1渊s冤

+

-GX2渊s冤

L2渊s冤

Hi2渊s冤

Fig.3Equivalent图3前馈控制等效变换原理图

feedforwardtransformationcontrol

schematicdiagramof

袁LCL1/G4V遥

X1渊s冤袁GGg渊s冤X1i(s(s))Ifer渊s+

冤+

+nv(s)-1/L1s

--

Gi渊s冤

+

-

Gi-

1/Cs1/L2s

iL2渊s冤

Hi1(s)Hi2(s)

Fig.4图Full4feedforward电网电压前馈控制及其等效变换框图itsequivalentvoltagecontrolconversion

blockdiagramand

袁袁袁遥袁5遥[8]袁袁尧袁袁3袁遥LCL袁袁霍现旭袁等高谐波电网工况下光伏逆变器控制策略研究

+L1CSVg渊s冤

+G2inv(s)/

Hi1+

(s)Cs1/Ginv(s)

Ifer(+

s)+--

Gi渊s冤渊s冤

-Ginv(s)1/L1s

1/Cs

-

-

1/L2s

iL2Hi1(s)Hi2(s)

Fig.5Fullfeedforward图5电网电压全前馈控制框图

controlblockdiagramofcridvoltage

袁袁遥袁

袁遥GGiX1渊渊ss冤冤=Ginv1渊s冤+Hi1渊s冤Cs+GLCsinv1院G渊s2冤GX13X2渊配电网谐波抑制策略

s冤渊s冤遥渊7冤曰

PR遥PR袁袁袁PR[9]袁袁遥袁袁袁遥PR袁遥PR渊PR冤G渊s冤=Kp+s22K+棕Rs02渊8冤G渊s冤=Kp+

s2+22K棕R棕cs+棕cs02渊9冤

院K曰K曰棕p曰棕R0c遥

尧5袁7

遥5袁7袁PR袁6遥

Kpi*as2K+棕isuai02a

s2+5渊K5棕s0冤2s2+7渊K7棕s0冤2Fig.6Multilevel图6多级PRPRcontrol控制并联结构

parallelstructure

PRPR袁袁袁5袁7尧PR袁遥h袁11袁13袁院

GPR渊s冤=Kp+s2+2棕KR棕cs+渊csh棕0移

h=1,5,7袁PR冤2渊10冤袁

袁PR袁遥袁袁遥

PR袁7遥

Vg(s)

PIDUfersin兹

IG(s)

UPI

Irefbus

ac

PR

Fig.7图Structure7PRblock控制和前馈控制策略结构框图

controldiagramstrategy

ofPRandfeed-forward

袁袁袁4[10]遥

4.1实验与仿真系统仿真分析

袁Matlab/Simulink遥窑1681窑

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院Kp400V袁220V袁

2350滋F袁L1L21.5袁6.5mH袁15滋F袁50Hz袁10kHz袁PR500袁Kr100遥

500-500500-500500-500

0000

0.02

0.04

0.06

0.08

0.10

0.12

0.14

0.16

0.18

2019袁37渊11冤

尧PR遥8袁袁THDPR袁9遥

VI0.20VI

BA00.020.040.060.080.100.120.140.160.180.20VI

C00.020.040.060.08

渊a冤500-50050000

0.02

0.04

0.06

0.08

00

0.02

0.04

0.06

0.08

0.10/s

0.120.140.160.180.20

尧VI

A0.100.120.140.160.180.20VI

-500500-500

0

B0.100.120.140.160.180.20VI

C00.020.040.060.08

0.10/s

0.120.140.160.180.20

5.04.54.03.53.02.52.01.51.00.50

图8补偿前后电压电流波形对比图

Fig.8Comparisonofcurrentandvoltagewaveformsbeforeandaftercompensation

5.04.54.03.53.02.52.01.51.00.50

渊b冤尧0246

81012141618200246

8101214161820

渊a冤袁0.69%袁51.52%窑1682窑

8袁9袁THD图9补偿前后并网总电流THD对比

Fig.9THDcomparisonoftotalgrid-connectedcurrentbeforeandaftercompensation

THD渊b冤THD

2.73%0.62%袁70.21%袁5袁75.14%遥袁袁袁5袁7遥

霍现旭袁等高谐波电网工况下光伏逆变器控制策略研究

4.2实验验证

TMS320F2808袁袁10kW遥袁10遥

150100500

1111袁12PR袁袁PR遥THD袁袁12PRPR袁

遥袁袁遥-50-100-150

0

5

10

15

2025/ms

30

35

40

45

图10加入谐波后的电网电压波形图

Fig.10Voltagewaveformofpowergridafterharmonics

1501005003THD4.49%2.36%袁5THD4.22%2.59%袁7THD4.28%2.63%遥

150100500袁袁THD4.69%2.12%袁

-50-100-1500510152025/ms30354045-50-100-1500510152025/ms30354045渊a冤65432图11补偿前后并网电流波形图

Fig.11Comparisonofcurrentandvoltagewaveformsbeforeandaftercompensation6543PR渊b冤PR135791113151719212325272931333521357911131517192123252729313335渊a冤PR5总结

尧PR遥图12补偿前后并网电流THD值

Fig.12THDvalueofgrid-connectedcurrentbeforeandaftercompensation

参考文献院

THD渊b冤PRTHD袁袁袁袁尧[1][2]

Salem

袁2018袁36渊11冤院1656-1662.

Rahmani袁AbdelhamidTransactions

on

.[J].Haddad袁etal.Acombinationofshunthybridpowerfilterandthyristor-controlledreactorforpowerquality[J].IEEE

2014袁61渊5冤院2152-2164.

袁.Industrial

Electronics袁Hamadi袁KamalAl-

遥

[3]PRLCL窑1683窑

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[J].袁袁袁2015袁49渊4冤院91-93..[J].PR[7][8][9]

渊9冤院75-79.袁[J].袁袁袁袁..2019袁37渊11冤

LCL袁2016袁34渊11冤院1626-1631.[J]...袁2014袁42渊12冤院44-50.Xue

Mingyu袁Zhang

feedforwardofgridvoltagefordiscretestatefeedbackcontrolledgrid-connectedinverterwithLCLfilter[J].渊10冤院4234-4247.袁袁Yu袁KangYong袁etal.Full

渊6冤院7-14.袁袁2011袁31IEEETransactionsonPowerElectronics袁2012袁27[6]

.PWM[10][J].袁[J].袁2010袁38

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[J].PWM袁2015袁34渊2冤院39-43.

袁2006袁12渊2冤院160-

ContralstrategyofPVinverterinhighharmnonicpowergrid

渊1.TianjinElectricPowerResearchInstituteofStateGridTianjinElectricPowerCompany袁Tianjin300130袁China曰2.StateGridTianjinElectricPowerCompanyChengdongPowerSupplyBranch袁Tianjin300250袁China曰3.CollegeofArtificialIntelligenceandDataScience袁HebeiUniversityofTechnology袁Tianjin300130袁China曰4.TianjinColinElectricCo.袁Ltd.袁Tianjin300130袁China冤

HuoXianxu1袁ZhaoChangwei2袁ZhangHuiying2袁HeGuixin3袁ZhaoZhiguo4袁LiLianbing3Abstract院Underdifferentgridconditions袁theloadofPVgrid-connectedinverterisdifferent袁resultingincurrentharmonicsandgridvoltagedistortion.Inthispaper袁acontrolstrategycombiningfullfeed-forwardcontrolwithmulti-PRisproposed.Thefeed-forwardpartofthepowergridvoltageisimproved袁thefilteringlinkisadded.Thereal-timeperformanceofthesystemimprovesandtheinfluenceofthebackgroundharmoniconthePVinverterreduces.Themulti-PRfrequency-selectingcontrollerisusedtoreducethestaticACerror袁realizethecompensationofspecificfrequencyharmonicandreducetheharmoniccontentofgridconnectedcurrent.Finally袁theeffectivenessofthecontrolstrategyisverifiedbyMatlab/Simulinksimulationandexperimental.Theexperimentalresultsshowthatthecontrolstrategycanobviouslyeliminatevoltageandcurrentharmonics袁improvethesystemrobustness.

Keywords院grid-connectedinverter曰multi-PRcontrol曰fullfeed-forwardcontrol

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