基于重复控制的有源滤波器的三态滞环控制方法

针对有源电力滤波器的被控电流为周期变化的正弦量,提出引入重复控制对有源电力滤波器电流进行控制,以减小系统的稳态误差.在此基础上,为提高系统响应速度,将重复控制与滞环控制有机结合,提出了三态滞环控制方法.通过检测电网电压和直流电压的控制直接获得期望的电网电流,简化了检测电路.利用串级控制的思想,对电压环的参数进行设计,为有源滤波器控制器参数设计提供一定的理论指导.该方法的物理意义明确,且算法的复杂度小、实时性强,工程容易实现.实验结果证明了该方法的可行性.

Repetitive Control Based Three-State Hysterisis Control of a Single-Phase Active Filter

The repetitive control is introduced for current control of active power filter to eliminate the steady state periodic error. Furthermore, a three-state hysteresis controller, which consists of repetitive control part and hysteresis control part, is constructed to promove the dynamic performance of the system. The expected supply current is directly calculated by the supply voltage and the output of the voltage loop controller. As a result, the detection algorithm is simplified. Discussions on the design of the voltage control loop are presented and a significant theory basis for designing the controller parameters of active filter is offered. The proposed method is simple and easy for engineering implementation. The experimental results demonstrate the effectiveness of the proposed method.