并联型有源电力滤波器双闭环控制策略研究

Research of double closed-loop control strategy for shunt active power filter

分析了并联型有源电力滤波器控制器双闭环控制策略的实现原理:针对PI控制不能无静差地跟踪交流信号、重复控制动态响应速度较慢的问题,提出了电流内环采用基于重复控制和PI控制的复合控制策略,该策略利用重复控制改善并联型有源电力滤波器控制系统的稳态跟踪性能,利用PI控制改善并联型有源电力滤波器控制系统的动态特性;针对PI控制较难确定并联型有源电力滤波器控制系统的传递函数、不能在线整定PI参数的问题,电压外环采用模糊PID控制策略控制直流侧电压。Matlab/Simulink仿真结果验证了该控制策略的正确性和可行性。

The paper analyzed implementation principle of double closed-loop control strategy for shunt active power filter. In view of problems that PI control cannot track AC signal without static error and repetitive control has slow dynamic response speed, the paper proposed a composite control strategy based on repetitive control and PI control for current loop to improve stable tracking performance of control system of shunt active power filter by repetitive control and dynamic performance of control system of shunt active power filter by PI control. In view of problems that PI control is difficult to determine transfer function of control system of shunt active power filter and cannot online set PI parameters, the paper proposed a fuzzy PID control strategy for voltage loop to control DC voltage. Matlab/Simulink simulation result validates correctness and feasibility of the control strategy.