多功能并网逆变器及其在微电网中控制策略的研究

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1、浙江理工大学硕士学位论文多功能并网逆变器及其在微电网中控制策略的研究3、设计了并网逆变器参考电流的控制电路。改进了多功能并网逆变器的功率跟踪控制电路，用于基波正序有功电流的控制和当前剩余容量的计算；构建了部分次谐波电流的控制结构，并根据剩余容量选择补偿电流的次数。通过理论分析，证明了电流任意次谐波分量在dq坐标系下的d轴坐标大于0时治理的不必要性，根据该结论，设计了零值比较器，自适应地判断当前谐波电流各分量的有功成分是否需要补偿。仿真结果验证了采用该策略的并网逆变器可以实现上述柔性谐波电流治理思路。本文所提出的细粒度的谐波检测方法和改进的控制

2、电路结构，可以在不改变并网逆变器的主体硬件结构的前提下，同时完成有功功率输出的基本功能和精细谐波电流补偿的辅助功能，为微电网中的电能质量的治理提供了成本少、灵活的解决方案。关键词：并网逆变器；微电网；电能质量；谐波检测；谐波有功电流；谐波无功电流ii万方数据浙江理工大学硕士学位论文多功能并网逆变器及其在微电网中控制策略的研究AbstractAsaspecialdistributedgenerationsystem,micro-gridplaysanimportantroleinassociatingthedistributionnetwork

3、withrenewableenergy.Itcaneffectivelyreducetheimpactofrenewableenergygridunittothedistributionnetworkandimprovethepowerqualityandreliabilityofpowersupply.Meanwhile,asanequipmentofconvertingDCenergyofdistributedpowerintogrid-usedACpower,thegrid-connectedinverterplaysacrucialr

4、oleinthestableoperationofmicro-grid.However,distributedgenerationunitoftheDCsideofgrid-connectedinvertertendstohaveintermittentandrandomcharacteristicsandthegrid-connectedinverterofmicro-gridmostlyonlycanrigidlyconvertdistributedDCpowerintopuresinewaveAC,makethegrid-connect

5、edinvertermostlydoesnotworkatratedcapacity,whichleadstodynamicsurpluscapacity.Oncethedistributedpowergenerationcapacityisinsufficienttogrid-connecting,thegrid-connectedinverterhastobedisconnectedfromthemicro-grid,andthisfrequentstateswitchmightbroughtsignificantimpactstomic

6、ro-grid.Howtomakethegrid-connectedinvertercontinuouslyconnectedinmicro-gridandusethechangingpowermarginofgrid-connectedinvertertodosuchas,reactivecurrentcompensation,harmoniccurrentcompensationandnegative-sequencecurrentcompensationtomicro-grid,isbecomingoneofthegreatresear

7、chvalueresearchinmicro-gridresearcharea.Inthispaper,thetechnologicaldemandsinaddingauxiliaryfunctionstogrid-connectedinverterundertheconditionofdynamicsurpluscapacityinmicro-gridareinvestigated.Thefollowingresearches:theharmonicgovernancestrategy,harmonicdetectionmethods,an

8、dharmoniccontrolmethodsinmicro-grid.1、Studiesontheharmoniccurrentgovernancestrateg