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时间:2020-03-28
《非理想电网光伏并网逆变器控制策略研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第50卷第6期电力电子技术Vo1.50,No.62016年6月PowerElectronicsJune2016非理想电网光伏并网逆变器控制策略研究罗书克(许昌学院,电气(机电)工程学院,河南许昌461000)摘要:当电网电压中含有谐波或三相不平衡以及电网基频偏移时,必须考虑并网逆变器在非理想电网下的并网控制策略。为提高并网电能质量,分别从电网电压畸变不平衡和电网基频偏移角度进行了分析,提出并网逆变器在非理想电网下的控制策略,即在保证并网电能质量前提下,通过调节电流控制指令中负序分量的权重,实现并网电流幅值不平衡和瞬时
2、有功波动之间的协调控制。理论分析进一步表明,并网逆变器建立在Ot,坐标系下不仅可避免LCL滤波器参数摄动对并网电流的影响,而且可避免锁相环节中复杂的三角函数运算,降低系统运算量.其控制性能要优于并网逆变器在d,q同步旋转坐标系下的控制方案。仿真与实验结果也验证了所提控制策略的可行性和有效性。关键词:并网逆变器;非理想电网;滤波器;电能质量中图分类号:TM464文献标识码:A文章编号:1000一100X(2016)06—0029一O5StudyofControlStrategyforPVInverterBasedonI
3、mperfectGridLU0Shu.ke(XuchangUniversity,Xuchang461000,China)Abstract:Thecontrolstrategyofdconnectedinvertermustbetakenintoaccountinthenonidealdwhenthedvoltagecontainsharmonics,three—phaseunbalance,andfundamental~equencyofset.Inordertoimprovethesndpowerquality,t
4、heunbalancedg甜voltagedistortionandpowerd~equencydeviationanglea舱analyzed,gridcon—nectedinverterundernonidealpowercontrolstrategyisproposed,intheguaranteepowergridquality,byadjustingthenegativesequenceofthecurrentforinvertertothed,coordinatedcontrolbetweenunbala
5、ncedv4dconnectedcurrentamplitudeandinstantaneousactivepowerfluctuations.TheoreticalanalysisfurthershowthatthedconnectedinverterestablishmentinalphabetastaticcoordinatesystemcannotonlyavoidtheLCLfilterparameterperturbationofgridconnectedcurrentefect,butalsoavoid
6、thecomplexoperationoftrigonometricfunctioninphaselocklopin,reducetheamountofoperationforthesystem.Thecontrolperformanceisbetterfordconnectedinverterthansyn—chronouscordinatesystemcontrolschemeinthed,qcoordinate.Simulationandexperimentalresultsalsoverifythefeasi
7、bilityandefectivenessoftheproposedcontrolstrategy.Keywords:grid—connectedinverter;notidealgrid;filter;powerqualityFoundationProject:SupportedbyScienceandTechnologyResearchProjectforScienceandTechnologyDepartmentofHenanProvince(No.162102210302);ImportantScientif
8、icResearchProjectforEducationDepartmentofHenanProvince(No.15A470004)1引言电流,这将给并网逆变器的控制带来不利影响[4-51。因此,对非理想电网下光伏并网逆变器控制策略为使光伏发电系统能够高效的并网运行。需的研究具有重要意义。要对光伏并网逆变器进行并网控制。当电网处于在此提出一
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