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1、第42卷第16期電力系統(tǒng)保護(hù)與控制Vb1.42No.162014年8月l6日PowerSystemProtectionandContro1Aug.16,2014模塊化多電平變流器HVDC系統(tǒng)的模型預(yù)測控制朱玲,符曉巍,胡曉波,王曉茹(1.西南交通大學(xué)電氣工程學(xué)院,四川成都610031;2.西安交通大學(xué)電氣工程學(xué)院,陜西西安7100383.中國電力科學(xué)研究院,北京100192)摘要:隨著電壓源變換器型高壓直流(Voltage—SourcedConverter—BasedHigh—VoltageDirectCurre
2、nt,VSC—HVDC)輸電需求的持續(xù)增加,模塊化多電平變換器(ModularMultilevelConverter,MMC)成為柔性直流輸電的研究熱點(diǎn)。環(huán)流的抑制和子模塊電容電壓的平衡是MMC控制的研究重點(diǎn)之一。推導(dǎo)了模塊化多電平變換器高壓直流(Modu1arMu1tileve1ConverterbasedHVDC,MMC—HVDC)輸電系統(tǒng)的離散數(shù)學(xué)模型,在此基礎(chǔ)上針對五電平MMC的控制目標(biāo)提出一種改進(jìn)的具有工程應(yīng)用價(jià)值的模型預(yù)測控制策略(Mode1PrediCtiveContro1,MPC)。通過引入誤差因
3、子減小了子模塊電壓波動(dòng)范圍,同時(shí)通過MPC與電壓排序算法相結(jié)合減小了傳統(tǒng)MPC的計(jì)算量,并實(shí)現(xiàn)了HVDC系統(tǒng)傳輸功率的控制、MMC環(huán)流的抑制和MMC子模塊中電容電壓的平衡。仿真結(jié)果驗(yàn)證了所提出的控制策略的有效性。關(guān)鍵詞:模塊化多電平換流器;高壓直流輸電;模型預(yù)測控制;電容電壓平衡;環(huán)流抑制ModelpredictivecontrolofmodularmultilevelconverterforHVDCsystemZHULing,F(xiàn)UXiao.wei,HUXiao.bo。,WANGXiao.ru(1.Schoolo
4、fElectricalEngineering,SouthwestJiaotongUniversity,Chengdu610031,China;2.SchoolofElectricalEngineering,Xi’anJiaotongUniversity,Xi’an710038,China;3.ChinaElectricPowerResearchInstitute,Beijing100192,China)Abstract:Withthecontinuouslygrowingdemandofthevoltage-so
5、urcedconverter-basedhigh-voltagedirectcurrent(vsc—HVDC)transmission,modularmultilevelconverter(MMC)achievesgreatattentionsinVSC—HVDCsystem.Circulatingcurrenteliminatingandsub-modulecapacitorvoltagebalancingisoneofthemaintechnicalchallengesassociatedwiththecon
6、trolofMMC.ThediscretmathematicmodelofthemodularmultilevelconverterbasedHVDC(MMC—HVDC)systemisderived,andanimprovedmodelpredictivecontrol(MPC)strategywithengineeringvalueisproposedforfive—levelMMC.Thesub-modulevoltagerippleisreducedbyintroducingtheerrorfactor.
7、Furthermore,thecombinationofMPCandvoltagesequencingalgorithmreducesthecomputationburden,andrealizesthetransmissionpowercontrolinMMC-HVDCsystem,circulatingcurrenteliminating,sub—modulecapacitorvoltagebalancing.Simulationresultsvalidatetheproposedcontrols~ategy
8、.ThisworkissupportedbyNationalNaturalScienceFoundationofChina(No.51128701).Keywords:MMC;HVDC;MPC;capacitorvoltagebalancing;circulatingcurrenteliminating中圖分類號:TM46文獻(xiàn)標(biāo)識碼:A文章編號:1674.3415(201