SWISS整流器的无源自抗扰控制

XU Rundong,LI Jianguo,ZHANG Yajing,WANG Jiuhe(School of Automation,Beijing Information Science&Technology University,Beijing 100192,China)

针对比例积分(proportional integral, PI)控制的SWISS整流器具有输出电压超调大、动态响应速度慢和抗干扰性能差的问题,提出了一种线性自抗扰控制与无源控制相结合的控制方法来控制SWISS整流器。分析了SWISS整流器的电流导通路径,建立了SWISS整流器的等值BUCK电路模型,设计了基于其欧拉-拉格朗日(Euler-Lagrange, EL)模型的无源控制器;为了提高抗干扰性能,电压外环引入改进的线性自抗扰控制器;加入前馈控制,使占空比的大小跟随电网电压的角度而变化。在此基础上,搭建了基于Simulunk的仿真模型,进行了仿真研究。仿真结果表明,与传统PI双闭环控制、外环PI内环无源控制方法相比,所提出的控制方法更好地改善了系统的跟踪性能和对输入电压波动、负载电阻变化等干扰的鲁棒性能。

Aiming at the problems of PI-controlled SWISS rectifier with large output voltage overshoot,slow dynamic response speed and poor anti-interference performance,this paper proposes a control method combining linear active disturbance rejection control and passive control to control SWISS rectifier.The current conduction path of SWISS rectifier was analyzed;the equivalent BUCK circuit model of SWISS rectifier was established,and the passive controller based on its Euler-Lagrange(EL)model was designed.In order to improve the anti-interference performance,an improved linear active disturbance rejection controller was introduced into the outer voltage loop.The feedforward control was added to make the duty cycle follow the angle of the grid voltage.On this basis,a simulation model based on Simulink was built,and the simulation research was carried out.The simulation results show that compared with the traditional PI double closed-loop control method and the passive PI inner loop control method,the proposed control method can better improve the tracking performance of the system as well as the robustness of input voltage fluctuation and load resistance change.