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1、光伏电源逆变器的设计摘要随着传统的三大化石能源日渐枯竭,绿色能源的开发和利用将会得到空前的发展,太阳能作为世界上最清洁的绿色能源之一,起并网发电备受世界各国普遍关注。而光伏并网发电系统的核心部件,如何可靠的高质量地向电网输送功率尤为重要,因此在可再生能源并网发电系统中起点能变换作用的逆变器成为了研究的一个热点。为此本文仍然采用“全桥逆变+LC滤波+工频升压”的逆变电源设计方案。整个系统设计分为SPWM波形产生电路、H桥驱动及逆变电路、欠压过流保护电路。在SPWM波形产生环节,本文采用脉宽调制芯片SG3525的为核心。由文氏桥振荡电路产生50Hz
2、的正弦波基准信号。然后经过精密整流、放大等处理输入到SG3525的补偿信号端,从而输出SPWM波。最后进行死区延时,输入到驱动电路中。在驱动电路设计环节中,本文采用两片IR2110半桥驱动芯片构成全桥驱动电路。输出侧逆变电路中开关管选用耐压值高的MOSFET。然后经过工频变压器进行升压到市电,供家用电器使用。对输入、输出进行采样,实时监控是否欠压、过流,进行保护动作。最后,给出额定功率为500W(输入电压12V输出交流220V)的单相逆变器样机的试验波形。关键词:光伏电源,逆变器,SPWM,SG3525,IR2110DESIGNOFPVPOWE
3、RINVERTERABSTRACTInrecentyears,photovoltaictechnologyhasbroadapplication.Asourcountry'snewenergylawenacted,thephotovoltaicpowersysteminourcountrywillhaveabroaderspacefordevelopment.InverterisanimportantcomponentinPVsystem.Itsperformancehasgreatinfluenceontheapplicationofphot
4、ovoltaicsystem.Currently,thedomesticpuresinewaveoutputinvertermainlyuses50Hztransformerforraisingtheoutputvoltage,thispaperisstilldevelopedaninverterbyusingthe“Full-bridgecircuit+LCfilter+Isolatortransformer”designproposal.ThewholesystemisdividedintoSPWMwaveformgeneratorcirc
5、uit,Hbridgedrivercircuitandtheinvertercircuit,lowvoltageandover-currentprotectioncircuit.InSPWMwaveformgenerationpart,thispaperusesSG3525PWMchipcore.TheWienbridgeoscillationcircuitgenerates50Hzsinereferencesignal.Afterthissignalprecisionrectification,amplificationandotherpro
6、cessingofthecompensationsignalinputtotheSG3525-side,sothispartoutputtheSPWMwave.Finally,theSPWMsignalsenterintothedrivingcircuitafterdead-timedelay.Inthedesignofdrivecircuitpart,usingtwoIR2110half-bridgedriverchipsconstituteafull-bridgedrivercircuit.Theoutputsideofinvertersw
7、itchcircuitselectshighvoltagevalueMOSFET.Thenthrough50Hztransformer,boosttothemainsforhouseholdappliances.Testingthesamplesoftheinputandoutputvoltage,real-timemonitoringisunder-voltage,overcurrent,protectionaction.Finally,ratedpowerfor500W(Inputvoltage12V,Outputcommunication
8、220V)single-phaseacinverterprototypetestwaveformshavebeengiven.KEYWORDS:PVp