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1、浙江理工大學(xué)碩士學(xué)位論文多功能并網(wǎng)逆變器及其在微電網(wǎng)中控制策略的研究3、設(shè)計(jì)了并網(wǎng)逆變器參考電流的控制電路。改進(jìn)了多功能并網(wǎng)逆變器的功率跟蹤控制電路，用于基波正序有功電流的控制和當(dāng)前剩余容量的計(jì)算；構(gòu)建了部分次諧波電流的控制結(jié)構(gòu)，并根據(jù)剩余容量選擇補(bǔ)償電流的次數(shù)。通過理論分析，證明了電流任意次諧波分量在dq坐標(biāo)系下的d軸坐標(biāo)大于0時(shí)治理的不必要性，根據(jù)該結(jié)論，設(shè)計(jì)了零值比較器，自適應(yīng)地判斷當(dāng)前諧波電流各分量的有功成分是否需要補(bǔ)償。仿真結(jié)果驗(yàn)證了采用該策略的并網(wǎng)逆變器可以實(shí)現(xiàn)上述柔性諧波電流治理思路。
2、本文所提出的細(xì)粒度的諧波檢測(cè)方法和改進(jìn)的控制電路結(jié)構(gòu)，可以在不改變并網(wǎng)逆變器的主體硬件結(jié)構(gòu)的前提下，同時(shí)完成有功功率輸出的基本功能和精細(xì)諧波電流補(bǔ)償?shù)妮o助功能，為微電網(wǎng)中的電能質(zhì)量的治理提供了成本少、靈活的解決方案。關(guān)鍵詞：并網(wǎng)逆變器；微電網(wǎng)；電能質(zhì)量；諧波檢測(cè)；諧波有功電流；諧波無功電流ii萬(wàn)方數(shù)據(jù)浙江理工大學(xué)碩士學(xué)位論文多功能并網(wǎng)逆變器及其在微電網(wǎng)中控制策略的研究AbstractAsaspecialdistributedgenerationsystem,micro-gridplaysanimpo
3、rtantroleinassociatingthedistributionnetworkwithrenewableenergy.Itcaneffectivelyreducetheimpactofrenewableenergygridunittothedistributionnetworkandimprovethepowerqualityandreliabilityofpowersupply.Meanwhile,asanequipmentofconvertingDCenergyofdistribute
4、dpowerintogrid-usedACpower,thegrid-connectedinverterplaysacrucialroleinthestableoperationofmicro-grid.However,distributedgenerationunitoftheDCsideofgrid-connectedinvertertendstohaveintermittentandrandomcharacteristicsandthegrid-connectedinverterofmicro
5、-gridmostlyonlycanrigidlyconvertdistributedDCpowerintopuresinewaveAC,makethegrid-connectedinvertermostlydoesnotworkatratedcapacity,whichleadstodynamicsurpluscapacity.Oncethedistributedpowergenerationcapacityisinsufficienttogrid-connecting,thegrid-conne
6、ctedinverterhastobedisconnectedfromthemicro-grid,andthisfrequentstateswitchmightbroughtsignificantimpactstomicro-grid.Howtomakethegrid-connectedinvertercontinuouslyconnectedinmicro-gridandusethechangingpowermarginofgrid-connectedinvertertodosuchas,reac
7、tivecurrentcompensation,harmoniccurrentcompensationandnegative-sequencecurrentcompensationtomicro-grid,isbecomingoneofthegreatresearchvalueresearchinmicro-gridresearcharea.Inthispaper,thetechnologicaldemandsinaddingauxiliaryfunctionstogrid-connectedinv
8、erterundertheconditionofdynamicsurpluscapacityinmicro-gridareinvestigated.Thefollowingresearches:theharmonicgovernancestrategy,harmonicdetectionmethods,andharmoniccontrolmethodsinmicro-grid.1、Studiesontheharmoniccurrentgovernancestrateg
