基于内模控制的改进型三相PWM整流器

针对三相电压型PWM整流器的双闭环控制系统直流母线电压超调较大、对扰动克服能力不强、鲁棒性差等问题,本文对控制系统进行了改进,在电压外环设计一种基于内模原理的控制器以取代传统PI控制器,并对内模控制器中滤波器部分的参数设计进行分析,最后使用MATLAB/SIMULINK进行仿真研究,并与电压外环采用PI控制器的系统性能进行比较。仿真结果表明,在电压环采用内模控制器,可以有效降低直流母线电压超调,快速抑制扰动,具有良好的鲁棒性,性能优于传统PI调节器。

Improved three-phase PWM rectifier based on IMC

With the problems of large voltage overshoot of DC bus,poor capability of restraining the disturbance and weak robust in three-phase voltage PWM rectifier double-loop control system,this paper designed a control system based on IMC controller instead of the traditional PI controller in voltage loop,and analyzed the parameters design of the filter which is a part of the IMC controller.Finally conducted the simulation with the tool of MATLAB/SIMULINK,and compared the performance with the system used PI controller.The simulation results illustrated the IMC controller in voltage loop could effectively reduce the voltage overshoot of DC bus,rapidly restrain disturbance,and have good robust.Its performance is better than the PI controller.