光伏汇流箱双路MPPT控制器的研究

摘要

在光伏发电系统中,汇流箱起到了汇集光伏电池电流和进行最大功率点跟踪(MPPT)的功能.设计了一种应用于光伏汇流箱的双路MPPT控制器,每个支路采用双重Boost结构,MPPT控制采取变步长的电阻增量法.对此双路MPPT控制器进行Simulink仿真和实验分析可知,双路双重Boost电路结构能够有效降低输出电流纹波;在光照突变后,采用变步长电阻增量法的MPPT控制器可以使光伏系统快速且稳定地达到新的最大功率点并且确保各个电感电流均流.%In the photovoltaic power generation system,the junction box has the function of collecting the photovoltaic cell current and tracking the maximum power point(MPPT). A dual circuit MPPT controller applied in PV junction box was designed,which used dual boost structure in each branch,the MPPT control used variable step resistance increment method. Simulink simulation and experimental analysis show that the dual boost circuit structure can effectively reduce the output current ripple;after the light mutation,variable step incremental resistance method adopted in MPPT controller can make photovoltaic cell rapidly and stability to achieve the new maximum power point and can ensure current equalization in the inductances.