中文摘要：

在低开关频率时采用传统电流调节器设计对PWM整流器进行控制，将导致dq轴电流的严重耦合，甚至系统不能正常工作。本文分析了PWM整流器的离散化模型，考虑实际系统中存在的PWM延迟，基于复矢量概念并结合整流器离散特性进行了直接离散化电流调节器设计。该设计方法不需要进行双线性变换，且其闭环系统与采样周期无关，性能稳定。通过几种离散化调节器的仿真结果对比显示了直接设计离散电流调节器的优越性能。

英文摘要：

At low switching frequency, severe cross-coupling will occur if current regulator adopting traditional dis- crete method is used to control PWM rectifier, moreover, the whole system even cannot work normally. In the pa- per a simple discrete-time domain PWM rectifier is developed that includes the delay associated with PWM. A dis- crete time domain current regulator is designed according to this model without tusin transformation, and closed- loop system is not influenced by sampling period. Simulation results compared with other regulators demonstrate that direct discrete current regulator has better performance.