PWM整流器直接功率控制策略仿真研究

Improved Direct Power Control Strategy for Three-phase PWM Rectifer

在电源整流器优化控制问题的研究中,需将线电压引入到三相电压型PWM整流器DPC控制系统。传统方法采用相电压时所需的旋转坐标变换计算,计算复杂,功耗大。为解决上述问题,推导出了用线电压和电流直接表示有功功率与无功功率的关系式,并且利用线电压判断电压矢量所在的空间,不仅降低了控制系统的计算量,对三相不平衡电压也起到一定的抗扰作用。与此同时,改进了传统的开关矢量表,仿真结果表明新的开关矢量表能更好的控制无功功率、保证更低的电流畸变率、降低了开关管的开关频率及功耗。

The paper focused on a three -phase pluses width modulation rectifier based on direct power control strategy. The proposed strategy has two main features to improve a total power factor and efficiency, one of which is consummating the rule of vector switching through optimizing the switching table. The other feature is taking the line voltage to calculate the instantaneous active and reactive power instead of d - q rotating coordinates, which not only decreases the amounts of computing, but also contributes resistance to imbalance - voltage. The simulation result has proven the better performance of the proposed system.