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1、摘要摘要微網(wǎng)技術(shù)為分布式電源大規(guī)模并網(wǎng)應(yīng)用提供了有效技術(shù)途徑,微網(wǎng)在實現(xiàn)分布式能源合理利用的同時,作為一個智能可控單元接受電網(wǎng)調(diào)度,與大電網(wǎng)間進行能量交換,為大電網(wǎng)安全可靠運行提供了有力支撐。微網(wǎng)多樣的運行方式與高質(zhì)量的電力服務(wù)離不開靈活與穩(wěn)定的控制系統(tǒng),其中微電源輸出有功功率和無功功率的解耦控制問題亟待研究。本文圍繞低壓微網(wǎng)的解耦控制方法展開了研究。首先全面地介紹了該課題的研究背景及其意義、微網(wǎng)技術(shù)概況、國內(nèi)外微網(wǎng)發(fā)展現(xiàn)狀、微網(wǎng)中解耦控制的研究現(xiàn)狀;介紹了應(yīng)用于微網(wǎng)的微電源并網(wǎng)逆變器結(jié)構(gòu),并對其控制系統(tǒng)進行了設(shè)計,仿真分析了其工作過程和控制性能;在此基礎(chǔ)上,針對微網(wǎng)線路功率
2、耦合問題,提出了一種基于相對增益分析的目標函數(shù)對角化微網(wǎng)功率解耦控制方法,量化了微網(wǎng)功率控制通道耦合度,實現(xiàn)了微網(wǎng)線路有功功率和無功功率的解耦控制;針對孤島運行微網(wǎng)中存在的功率耦合問題,提出了一種微網(wǎng)穩(wěn)壓解耦控制方法,實現(xiàn)了功率解耦,并保證了其電壓穩(wěn)定。本文方法實現(xiàn)了微網(wǎng)線路中的有功功率、無功功率的獨立、精確控制,增強了微網(wǎng)功率的可控性,有利于微網(wǎng)安全、穩(wěn)定、優(yōu)質(zhì)運行。關(guān)鍵詞:微網(wǎng);功率解耦;相對增益分析;虛擬電阻;穩(wěn)壓控制-I-華北電力大學(xué)碩士學(xué)位論文AbstractThetechnologyofMicrogridisanefficientandfeasiblewayfor
3、theutilizationofdistributedenergy.Beingcontrolledbythepowergridasanintelligentunit,microgridcanprovidehighqualitypowerandstrongsupportforthesafeandreliableoperationofthepowergridandrealizesthereasonableuseofdistributedenergy.Withoutthoroughandstablecontrolsystem,microgridcan’tsustainflexibl
4、eoperationmodesandhighqualitypowersupplyservices,andtheindependentactiveandreactivepowercontrolofmicrosourceisaburningquestion.Inthispaper,thedecouplingcontrolmethodforlowvoltagemicrogridwasstudied.Theresearchbackgroundandsignificance,anoverviewofmicrogridanditsdomesticandabroaddevelopments
5、ituation,thestudystatusofthedecouplingcontrolofmicrogridwerecomprehensivelyintroduced;Thecontrolsystemofinverterinmicrogridwasdesigned;Theobjectivefunctiondiagonalizationdecouplingcontrolformicrogridpowerbasedonrelativegainanalysiswasproposedforthecouplingprobleminmicrogrid,whichquantizedth
6、econtrolchannelcouplingdegree,andrealizedtheactivepowerandreactivepowerindependentcontrol;Avoltagestabilizationdecouplingcontrolmethodformicrogridwasproposedforthepowercouplingprobleminislandmicrogrid,realizingthepowerdecouplinginmicrogridandensuringitsvoltagestabilization.Theproposedmethod
7、realizestheindependently,precisely,flexiblycontroloftheactivepowerandreactivepower,andimprovesthecontrollabilityofmicrogrid,assuringthestable,highqualityandsafeoperationofmicrogrid.Keywords:Microgrid;powerdecoupling;relativegainanalysis;virtualresistor;v