单相光伏发电系统的并网控制仿真

兰州交通大学本科毕业设计（论文）I摘要纵观全球，经济的快速发展使得能源问题与环境问题日益凸显，然而新能源发电的发展，很有力地缓解了这些问题。其中光伏发电已逐步形成规模化发展，全球各国这些年对光伏并网发电的发展做出了巨大的贡献。光伏并网系统中的逆变器直接影响着并网效率以及输出电能质量的提高，因此，研究光伏并网逆变器对于光伏并网系统非常重要。全文以建立单相光伏并网控制平台为目标，首先就光伏并网发电的研究背景及其发展现状做了简洁的陈述，接着就系统的分类和组成进行了简单的介绍；然后对本课题的主要研究部分即单相全桥式逆变电路和在单极性SPWM控制方式下的逆变电路的工作模式和工作时区在理论上作了深入浅出的分析，并用心领会其核心思想。在完成了对上面相关理论的分析和研究之后，就在Matlab的仿真环境中先后搭建了单极性SPWM调制原理模型、单极性SPWM控制方式下的单相全桥式逆变电路模型和采用滞环控制的单相光伏并网系统模型。通过对它们的仿真后得到了理想的波形结果，同时对波形进行了傅里叶分析。关键词：光伏并网发电；单相逆变器；单极性SPWM；仿真单相光伏发电系统的并网控制仿真IIAbstractThroughouttheworld,therapiddevelopmentoftheeconomymakesenergyissuesandenvironmentalissueshavebecomeincreasinglyprominent,however,thedevelopmentofnewenergypowergenerationwhichisveryeffectivetoalleviatetheseproblems.AndPVpowergenerationhasgraduallyformedthescaleofdevelopment,inthepastfewyears,theworldcountrieshavemadeagreatcontributiontothedevelopmentofphotovoltaicgridconnectedpowergeneration.PVgridconnectedsystemhasadirectimpactonthegridefficiencyandoutputpowerquality,therefore,itisveryimportanttostudythephotovoltaicgridconnectedinverterforphotovoltaicsystem.Thefulltextaimatestablishingthesingle-phasephotovoltaicgridconnectedcontrolplatform,firstofall,brieflystatetheresearchbackgroundanddevelopmentstatusofgridconnectedphotovoltaicpowergeneration.Then,introducebrieflytheclassificationandcompositionofthesystem;Andthenthemainresearchofthistopicisanalyzedintheory,whicharethesingle-phasefullbridgeinvertercircuitandtheunipolarSPWMcontrolmodeoftheinvertercircuitandtheworkingmodeandtheworkingtimezone.Andtograspitscoreidea.Aftercompletingtheanalysisandresearchontheaboverelatedtheories,intheMatlabsimulationenvironmenthassetupaunipolarSPWMmodulationprinciplemodel,unipolarSPWMcontrolmodeunderthesingle-phasefullbridgeinvertercircuitmodelandtheuseofhysteresiscontrolofsingle-phasephotovoltaicgridconnectedsystemmodel.Afterthesimulation,theidealwaveformresultsareobtained,andFourieranalysisisusedforthewaveform.KeyWords:Grid-connectedphotovoltaicpowergeneration,Singlephaseinverter,UnipolarSPWM,Simulation兰州交通大学本科毕业设计（论文）III目录摘要.........................................................................................................................................IAbstract...........................................................................................................................................II目录.......................................................................................................................................III1绪论.............................................................................................................................................11.1光伏发电技术研究的意义..................................................................................................11.1.1光伏发电的发展前景...................................................................................................11.1.2国外光伏发电的发展现状...........................................................................................11.1.3我国光伏发电的发展现状...........................................................................................11.2光伏并网逆变技术..............................................................................................................21.3本文主要工作......................................................................................................................22光伏并网发电系统.....................................................................................................................42.1光伏并网发电系统的分类..................................................................................................42.1.1可调度式与不可调度式...............................................................................................42.1.2集中式发电与分布式发电...........................................................................................52.2一般光伏并网发电系统的组成..........................................................................................53单相并网逆变器.........................................................................................................................73.1逆变器的选择......................................................................................................................73.2单相全桥式逆变电路..........................................................................................................83.3单相逆变器的移相控制......................................................................................................93.4单相逆变器的器件选择......................................................................................................94SPWM控制...............................................................................................................................114.1PWM控制的基本原理......................................................................................................114.2SPWM控制的基本原理....................................................................................................124.3单极性逆变控制................................................................................................................124.3.1单极性逆变控制原理.........................