三相PWM整流器H_∞鲁棒控制器设计

Design of H_∞ Robust Controller for Three-phase PWM Rectifier

三相PWM整流器普遍采用双闭环PI控制策略。在此针对电流环特点,设计了一种H∞鲁棒控制器。基于d,q轴旋转坐标系下PWM整流器的数学模型,选择适当的状态参数,建立了满足H∞鲁棒控制标准型的增广状态方程。依据H∞鲁棒控制的原理,定义评价信号,通过求解Riccati不等式,得到H∞鲁棒控制器。仿真和实验证明了所提方法的可行性和有效性。

Double closed PI PWM rectifier is widely used in traditional design.An H∞ robust control method is present-ed for the inner current loop of three-phase PWM rectifier.Based on the mathematical model in synchronous of the PWM rectifier,state equations are established with suitable state variables for the standard setup of the H∞ robust control problem.After selecting suitable weighted coefficient,the Riccati inequality is solved to derive the H∞ robust controller.Simulation and experimental results demonstrate that the designed H∞ robust control system is suitable and effort for the PWM rectifier.