基于PI控制和重复控制的复合型单相光伏并网控制策略

Single Phase Photovoltaic Grid Interconnection Control Strategy Based on PI Control and Repetitive Control

为了减小并网电流的稳态误差,采用一种PI控制和重复控制相结合的复合型控制策略对光伏并网电流进行控制。以单相光伏并网系统为基础,推导出逆变器的传递函数,并引入PI校正控制器和重复控制环节。最后利用matlab/simulink平台进行仿真验证,并对仿真结果进行比较分析。仿真研究证明,采用PI控制和重复控制相结合的复合型电流跟踪控制策略有效减小了并网电流与指令电流之间的误差,同时也改善了动态响应速度,保证了并网电流与电网电压的同步关系。

In order to reduce the steady state error of interconnection current, a compound type control strategy combined with PI control and repetitive control is adopted to control the current of photovohaic interconnection. The transfer function of the inverter is derived based on the single phase photovohaic grid system which introduced the PI correction controller and the section of repetitive control. Finally the matlab/simulink platform is used for the simulation verification and simulation results are analyzed and compared. Simulation study shows that the compound type current tracing control strategy combined with PI control and repetitive control can effectively reduce the error between the interconnection current and the ordered current, and at the same time improve the dynamic response speed and guarantee the synchronous relationship between the interconnection current and the voltage of power grid.