三相四线制有源滤波器直流侧电压控制研究

摘要

In view of the disadvantages which exist in the DC -side voltage PI control of the three -phase four-wire active power filter , such as relatively large overshooting and slow dynamic response , this paper designed a compoun-ded fuzzy PI controller which combined fuzzy control with PI control .The controller fuzzified the input variables and then fuzzified the output variables by fuzzy inference control so as to achieve the purpose of modifying the parameters online.The paper analyzed the basic principle of the DC -side voltage PI control , adjusted the parameter of the PI controller by using the dual -output of the fuzzy controller and proposed a design process of the two -dimensional fuzzy PI controller ..The MATLAB simulation results showed that this method produced small overshooting and fast dynamic response , and could meet the requirements of mutation load conditions .Therefore the validity and superiority of the fuzzy PI controller were fully verified in this paper .%针对三相四线制有源滤波器直流侧电压PI控制存在超调比较大、动态响应速度慢等缺点，设计了一种采用模糊控制与PI控制相结合的模糊PI复合控制器。该控制器将输入变量进行模糊化，通过模糊推理控制模糊输出变量，以此实现在线修改参数的目的。分析了直流侧电压PI控制的基本原理，利用模糊控制器的双输出对PI控制器的参数进行整定，给出了二维模糊PI控制器的设计过程。 MATLAB仿真结果表明，该方法超调小、动态响应速度快，能满足负载突变工况的要求，验证了所设计的模糊PI控制器的有效性和优越性。