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1、第16卷第4期电源学报Vol.16No.4第2401期8年7月JournalofPowerSupplyJul.2018DOI:10.13234/j.issn.2095鄄2805.2018.4.133中图分类号:TM46文献标志码:A三相电压型准Z源逆变器电路拓扑和调制策略屈艾文,许俊阳,陈道炼(福建省新能源发电与电能变换重点实验室(福州大学),福州350116)摘要:准Z源逆变器具有宽范围升压能力,适用于光伏风力等可再生能源发电。从拓扑和调制策略两方面详述了三相电压型准Z源逆变器的发展与现状,并获
2、得了重要结论。其电路拓扑包括基本型、强升压能力改进型、低电压应力改进型和能量存储型4类,其中强升压能力改进型又分为单阻抗网络和级联阻抗网络2类,给出了电压应力、升压能力等特性比较;低电压应力改进型包括三相三电平中点钳位、级联多电平和级联Trans等。调制策略有正弦脉宽调制SPWM(sinusoidalpulsewidthmodulation)、改进空间矢量脉宽调制SVPWM(spacevectorpulsewidthmodulation)和消除共模漏电流改进脉宽调制PWM(pulsewidthmo
3、dulation)3类,给出了调制系数、电压应力特性比较。关键词:准Z源逆变器;三相;电压型;电路拓扑;调制策略CircuitTopologiesandModulationStrategiesforThree鄄phaseVoltage鄄fedQuasi鄄Z鄄sourceInverterQUAiwen,XUJunyang,CHENDaolian(FujianKeyLaboratoryofNewEnergyGenerationandPowerConversion,FuzhouUniversity,Fu
4、zhou350116,China)Abstract:Owingtoitswiderangeofvoltageboostcapability,quasi鄄Z鄄sourceinverter(qZSI)issuitablefortheren鄄ewableenergypowergeneration,suchasphotovoltaicandwind.Inthispaper,thedevelopmentandcurrentsituationofthree鄄phasevoltage鄄fedqZSIarepre
5、sentedfromtheaspectsofcircuittopologyandmodulationstrategy,andsomecon鄄clusionsareobtained.Thecircuittopologiesincludebasictype,strongboostcapabilityimprovedtype,lowvoltagestressimprovedtype,andenergystoragetype;thesecondtypecanalsobecategorizedintosin
6、gleandcascadedimpedance鄄sourcenetworks,andtheircharacteristicsincludingvoltagestressandboostcapabilityarecompared;thethirdtypecon鄄sistsofthree鄄phasethree鄄levelneutral鄄point鄄clamped,cascadedmultilevel,andcascadedTrans,etc.Themodulationstrategieshavethr
7、eetypes,i.e.,sinusoidalpulsewidthmodulation(SPWM),modifiedspacevectorpulsewidthmodulati鄄on(SVPWM),andmodifiedpulsewidthmodulation(PWM)withcommonmodeleakagecurrentdecreasing,andtheirch鄄aracteristicsincludingmodulationcoefficientandvoltagestressarecompa
8、red.Keywords:quasi鄄Z鄄sourceinverter;three鄄phase;voltage鄄fed;circuittopology;modulationstrategy近年来,光伏、风力等可再生能源发电系统获路结构简洁,易于控制,但存在如下缺陷:①电压得了越来越广泛的应用。可再生能源输出功率需经型/电流型逆变器为降压型/升压型逆变器,不适合变换器调节,其可靠性需变换器的性能加以保证。应用在光伏、风力等宽输入电压变化范围的逆变场脉宽调制PWM(pulsewidth