单相光伏并网逆变器建模与控制技术研究t

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1、单相光伏并网逆变器建模与控制技术研究周林，冯玉，郭珂，刘强，贾芳成，黄勇(重庆大学输配电装备及系统安全与新技术国家重点实验室，重庆400030)摘要：对一种两级式单相光伏并网逆变器进行丫研宂，它由Boost和带LCL滤波器的逆变器组成。建立丫前级电路的小信号校型，不含右半平而零点，光伏阵列工作点变化不影响除转折频率外的幅频特性，简化了控制器的设计。采用双电流环控制策略：将滤波电容电流作为内环反馈量，实现了LCL滤波器的有源阻尼，并对两种方式进行了分析比较；外环采用准PR+HC控制，实现并M电流零稳态误差控制，具有很好的跟随性能和抗干扰性能。基于能呈平衡股理，推导了电压控制器输出到直流链电压的大

2、信号模型，将系统校正成II型系统，并引入了复合控制，消除了稳态误差，增强了系统抗干扰能力。最后川Saber进行丫仿真，证明丫建模和控制方法的有效性。关键词：光伏并网逆变器；建模；LCL滤波器：冇源阻尼：PR控制；前馈控制；Saber仿KResearchonModelingandControlStrategyforSingle-PhasePhotovoltaicGrid-connectedInverterZHOULin,FENGYu,GUOKe,LIUQiang,JIAFang-cheng,HUANGYong(StateKeyLaboratoryofPowerTransmissionEquipm

3、ent&SystemSecurityandNewTechnology,ChongqingUniversity,Chongqing400030，China)Abstract：Atwo-stagesingle-phasephotovoltaicgrid-connectedinverterhasbeenstudiedinthispaper,whichconsistsofaboostDC/DCconverterandaDC/ACinverterwithLCLfilter.Thesmall-signalmodelofpre-stagedoesnotcontainanyright-halfplanezer

4、oandtheamplitude-frequencycharacteristicsexceptthecornerfrequencywouldn’tbeaffectedbyPVarrayoperatingpoint,whichsimplifiesthecontroller'sdesign.Atwo-current-loopcontrolstrategyisused:thefilter-capacitorcurrentastheinner-loopvariableisadoptedforactivedampingoftheLCLfilter,andtwokindsofmethodsareanaly

5、zedandcomparedinthispaper;thegridcurrentastheouter-loopvariableisadoptedforachievingzerosteady-stateerrorbyaquasi-PR+HCcontroller,whichhasthehighperformanceinboththesinusoidalreferencetrackingandthedisturbancerejection.ThelargesignalmodelfromtheoutputofvoltagecontrollertotheDC-linkvoltageisderivedba

6、sedonenergybalance，thenthedesignforPIcontrolleraboutthecontrolsystemisaccomplished,thecontrolsystemiscorrectedtobetypicalIIwhichcaneliminatethesteadyerrorandimprovetheanti-disturbingabilitywithcompoundcontrol.ThesimulationinSaberconfirmstheeffectivenessofthemodelingandcontrolstrategy.Keywords:photov

7、oltaicgrid-connectedinverter;modeling;LCLfilter;reactivedamping;PRcontrol;feed-forwardcontrol;Sabersimulation0引言太阳能作为一种収之不尽、用之不竭的清洁能源，在近些年來受到世界各国政府和能源专家的高度重视，光伏并网发电技术己经成为研究的焦点［11。光伏并网逆变器作为光伏电池和电网接口设备，