基于MPPT的单相光伏并网发电系统仿真研究  

Simulation study of single-phase gird connected photovoltaic system based on MPPT

作　　者：陈娟[1] 江天博 杨奕[1] 程景飞[1] 

机构地区：[1]南通大学电气工程学院,江苏南通226019 [2]上海电力学院自动化工程学院,上海200090

出　　处：《电源技术》2014年第12期2405-2407,2444,共4页Chinese Journal of Power Sources

基　　金：南通市应用研究计划项目(BK2012052;BK2013071);2012年国家级大学生创新创业训练计划项目(201210304027)

摘　　要：在Matlab/Simulink仿真环境下,设计了含PV、并网逆变器和控制器三个模块的5 k W单相光伏并网逆变系统。控制器采用电压外环电流内环的双闭环控制方法,具有最大功率跟踪功能。在外界环境突变情况下,对比分析了变步长电导增量法和定步长电导增量法的最大功率跟踪控制效果以及系统并网性能。仿真结果表明,光照强度突变时,采用定步长电导增量法,并网谐波电流总畸变率超出3%,不满足并网要求,而采用变步长电导增量法,在温度和光照强度突变时,均可快速、准确实现最大功率跟踪控制,且并网谐波电流总畸变率低于3%,功率因数接近1。Under Matlab/Simulink simulation environment, a 5 kW Single-phase Grid Connected Photovoltaic System which contains PV modules, Grid connected inverter and controller was designed. The controller with the function of Maximum Power Point Tracking （MPPT）, the double closed loop control method was used. While the environment changes rapidly, based on fixed-step incremental conductance method and variable-step conductance increment method, the MPPT control effect and grid performance of the system were analyzed and compared. The simulation results show that, when using fixed-step incremental conductance method and the light intensity changes rapidly, the Total Harmonic Distortion （THD） for current which exceeds 3% does not meet the grid requirements; but the system can realize the accurate MPPT quickly while using variable-step increment conductance method, and the THD is less than 3%, power factor is close to 1.

关 键 词：光伏并网发电系统 变步长电导增量法 最大功率跟踪 谐波电流总畸变率 

分 类 号：TM615[电气工程—电力系统及自动化]