静止坐标系下PWM整流器的控制及谐波补偿策略

Control and Harmonic Compensation Strategy for PWM Rectifier in Static Coordinate System

与基于同步旋转坐标系的PWM整流器电网电压定向矢量控制策略相比,静止坐标系下的电压定向矢量控制策略省去了电流环解耦以及旋转坐标变换,使控制系统更加简单;同时,控制策略可以很方便地实现交流侧低次电流谐波的补偿.在静止坐标系下建立了PWM整流器控制系统的数学模型,并对控制系统的动静态性能及谐波抑制能力进行分析.研究结果表明,静止坐标系下PWM整流器的电压定向矢量控制及谐波补偿策略能够实现对交流信号的无静差跟踪和对交流侧低次电流谐波的补偿,提高了电网的电能质量.

Compared with power grid voltage oriented vector control strategies for PWM rectifiers hased on synchronous reference frame, voltage oriented vector control strategies in static coordinate System eliminate the current loop decoupling and rotating coordinate transformation, which makes the control system more simple. Besides, the compensation of lower order current harmonics at the AC side is easily achieved with the proposed control strategy, The mathematical model of the control system for the PWM rectifier is established, The dynamic and static perfomance of the control system and the ability to suppress the harmonics are analyzed. The results show that the proposed control strategy is able to achieve static tracking of AC signals and compensate the lower order current harmonics at the AC side, Also, the grid quality is improved.