基于滑模变结构控制的三相PWM整流器

在建立三相PWM整流器数学模型的基础上,针对目前三相PWM整流器动态性能较差的特点,设计了电压、电流双闭环控制系统。在内环电流的控制中,采用解耦方法对dq轴电流分别控制,为电流控制器设计了一种滑模变结构控制(SMVSC)方法。仿真实验表明:该控制方法设计简单,提高了PWM整流器的动态性能,而且较好地实现了电流的解耦控制,且使系统鲁棒性增强。

Three-phase PWM rectifier based on sliding-mode variable structure control

Aiming at the poor dynamic performance of current three-phase PWM rectifiers,a control system with double close-loops of voltage and current is designed based on the mathematical model of 3-phase PWM rectifiers. The decoupled currents in d q synchronous reference frame are separately controlled within the inner-loop of current control,for which the sliding-mode variable structure control is applied. Simulative and experimental results indicate that,with simple structure,the method improves the dynamic performance of PWM rectifiers,realizes the decoupled control of current and strengthens the system robustness.