基于PSCAD的光伏并网系统的研究  

Study on PSCAD-based Modeling of PV-integrated Grid

作　　者：周明 杜文妍 ZHOU Ming;DU Wenyan(Heze Power Supply Company,Shandong University of Science and Technology,Heze 274000,China)

机构地区：[1]菏泽供电公司,山东菏泽274000

出　　处：《电工技术》2023年第22期41-45,共5页Electric Engineering

摘　　要：光伏发电是一个日趋重要的研究课题。根据光伏电池数学模型,利用PSCAD软件建立光伏电池的仿真模型并进行了仿真,结果表明光伏电池的输出特性呈明显非线性并随环境温度和光照的变化而变化。针对光伏电池最大功率跟踪点,在原有电导增量法基础上提出了一种改进的MPPT模型搭建方法(变步长电导增量法),仿真结果表明外界环境发生变化时,改进的电导增量法能够使光伏阵列快速、准确地跟踪最大功率点,确保系统稳定高效运行。为实现光伏发电系统并网运行,搭建了光伏逆变器模型,成功地将光伏直流电逆变成交流电并入电网稳定运行。Photovoltaic power generation has become an increasingly important research topic.According to the mathematical model of PV cells,by using PSCAD software,the present work models photovoltaic battery and conducts the simulation,whose results show that the obvious nonlinearity and variation of PV cell output characteristics with changing ambient temperature and illumination intensity.With respect to photovoltaic maximum power point tracking(MPPT),a modified MPPT modeling method,i.e.,incremental conductance method with variable step length,is proposed on the basis of original incremental conductance method.Simulation results show that the modified incremental conductance method can make PV arrays rapidly and accurately tracking maximum power point in response to varying external circumstances,which ensures efficient and stable operation of PV generation system.Furthermore,a PV inverter model is established,through which the DC power produced by PV cells is successfully converted into AC power,realizing stable grid-compatibility of PV generation.

关 键 词：光伏电池 仿真模型 输出特性 MPPT 变步长电导增量法 光伏逆变器 

分 类 号：TM727[电气工程—电力系统及自动化]