三相电压型PWM整流器的解耦与控制研究

摘要

The topology structure of three-phase PWM voltage rectifier was introduced firstly and then analyzed the decoupling of the PWM rectifier. The simplified and controllable model of three-phase voltage source PWM rectifier can be realized by static and rotary coordinate transformation. The vector control based on rotary transformation could fail to decouple without accurate model and incomplete accordance between model parameters and system parameters which affects the system control performance. In order to achieve reliable and safe decoupling control,based on stator current decoupling control theory of induction motor, current internal model decoupling control strategy of three-phase voltage source PWM rectifier was proposed. The design and the scheme of the controller are given and all conclusions are supported by simulation. The results are favorable.%首先给出了三相电压型PWM整流器的拓扑结构并在其基础上对PWM整流器进行了解耦分析.通过静止坐标变换和旋转坐标变换,得到了简化的、有利于控制系统设计的三相电压型PWM整流器的数学模型.当模型不准确或系统参数与模型参数不完全匹配时,基于旋转坐标变换的矢量控制仍然存在解耦控制失败的可能,影响系统的控制性能.为实现可靠、安全的解耦控制,基于感应电动机定子电流解藕控制思想,对三相电压型PWM整流器电流内模解耦控制策略进行了研究,给出了内模解耦控制器的设计及实现方案,并进行了仿真实验.结果令人满意.