三相电压型PWM整流器的自抗扰控制研究

Research on Active Disturbance Rejection Control of Three-phase Voltage Type PWM Rectifier

三相电压型PWM整流器是一个多输入多输出的强非线性结构,并对三相电压型PWM整流器的数学模型和自抗扰控制器进行了原理分析;为了改善整流系统抗扰性及参数摄动等问题,采用一种改进型的非线性自抗扰控制方案,同时给出了离散形式的表达式;然后,重新构造了常规自抗扰控制器中非线性状态误差反馈控制律(NLSEF)和扩张状态观测器(ESO)的非线性函数,以此来克服非线性函数的不平滑性能,从而减小整流系统输出的高频颤振现象;在MATLAB/Simulink环境下进行仿真和搭建了实验样机来验证,改进型自抗扰控制器与常规自抗扰控制器进行对比分析。结果表明了改进型自抗扰控制策略改善了交流侧电压和负载突变敏感的缺点,并降低了交流侧电流总谐波含量,且直流侧电压具有更好的动静态性和鲁棒性。

The three phase voltage PWM rectifier is a strong nonlinear structure with multi input and multi output. The mathematical model and active disturbance rejection controller of the three phase voltage PWM rectifier are analyzed. In order to improve the disturbance immunity and parameter perturbation of the rectifier system, an improved nonlinear active disturbance rejection control scheme is used, and the discrete expression is given. Then, the nonlinear function of the nonlinear state error feedback control law(NLSEF) and the extended state observer(ESO) in the conventional active disturbance rejection controller is reconstructed to overcome the non-smooth performance of the nonlinear function, so as to reduce the high-frequency flutter of the output voltage of the rectifier system. In the MATLAB/Simulink environment, the simulation and the experimental prototype were built to verify the improved active disturbance rejection controller and the conventional active disturbance rejection controller were compared and analyzed. The results show that the improved active disturbance rejection control strategy can improve the AC side voltage and load mutation sensitivity, and reduce the total harmonic content of the AC side current, and the DC side voltage has better dynamic static and robust.