一种新的三相电压型PWM整流器控制方法

A New Control Method for Three-phase Voltage-source PWM Rectifier

针对采用常规控制方式的PWM整流器存在动静态性能较差的问题,提出了一种PWM整流器的新型控制方法。该方法电压外环采用滑模控制,电流内环采用内模控制,结合了滑模控制和内模控制的优点,即充分利用滑模控制的鲁棒性强、对负载的扰动具有很好适应性的优点,以及内模控制的良好跟踪性能和较高的稳态精度,使系统具有良好的动静态性能。以基于LCL滤波的三相电压型PWM整流器为研究对象,对其电流内环和电压外环进行了设计与分析,仿真和实验结果证明了所提方法的有效性和优越性。

According to the PWM rectifier with the conventional control method has the dynamic and static perfor- mance problems, a novel control scheme is presented for PWM rectifier.It uses the sliding-mode control as the voltage loop and uses internal model control as the current loop, taking the advantage of good robustness of the sliding-mode control and well adaptability to load disturbance, and taking the advantage of better tracking performance and higher steady-state precision of internal model control.Based on the LCL filter three-phase voltage type PWM rectifier as the research object, its current inner loop and voltage outer loop are designed and analyzed.The validity and advantage of the proposed control scheme are verified by simulation and experiment results.