基于滑模变结构有源滤波器控制方法研究

Research on Control Method of Active Filter Based on Sliding Mode Variable Structure

根据有源电力滤波器(APF)在运行时对电流内环稳定性、快速性及鲁棒性的要求,设计了一种基于滑模变结构的新型控制器对并联型APF进行电流内环控制,采用变指数趋近率的方法设计出离散控制器,可以实现对三电平APF的电流进行实时控制并降低了切换面的抖振问题。仿真与实验结果表明该控制器相比于鲁棒性具有更优的不变性并易于工程实现。

According to the requirements of active power filter(APF) for current inner loop stability,rapidity and robustness,a new controller based on sliding mode variable structure is designed to control the current inner loop of parallel APF,and the discrete controller is designed by using the method of variable exponential reaching rate,it can realize the real-time control of the current of the three-level APF and reduce the chattering problem of the switching surface.Simulation and experiments results show that the controller has better invariance than robustness and is easy to implement in engineering.