First, the state feedback is used to improve the process static and dynamic performance. Then, the controller is designed based on the internal model control principle.
采用了双环控制结构，先构造内环状态反馈以改善对象动态特性，然后按照内模控制原理设计外环的控制器。
Repetitive controller also is designed out of state feedback control loop to improve static performance of APF.
为保证电力有源滤波器的稳态指标，对状态反馈后的系统设计了重复控制器。
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