一种PWM整流器直接功率控制方法

PWM整流器的直接功率控制方法因具有简单实用、抗干扰能力强、良好的动态性能、可以实现有功无功的解耦控制的特性而被广泛应用。基于传统的V-DPC(voltage direct power control)和VF-DPC(virtual flux direct power control)控制方案，提出了一种新的控制方案。新控制方案减轻了电网电压不理想条件下(电网电压畸变或不平衡)产生的影响。PWM调制器应用保证了恒定的开关频率。增加电网电压传感器使得利用低分辨率ADC转换器实现控制策略成为可能。通过引入电网电压的不平衡补偿模块和重构模块，改善了系统在电网电压不平衡或畸变条件下的性能。实验结果证实了这种方法的有效性。

A New Direct Power Control for PWM Rectifier

Direct power control (DPC) schemes have been widely used because of its simplicity, noise resistance, good dynamic performance, decoupled active and reactive power control. A new DPC scheme is proposed based on conventional voltage direct power control (V-DPC) and virtual flux direct power control (VF-DPC) schemes. The new DPC scheme mitigates the influence caused by undesired AC line voltage such as distorted or asymmetric voltage. The utilization of PWM modulator makes the switching frequency constant and the adoption of line voltage transducers enables it feasible to carry out the control scheme with less precise ADC devices. Moreover, the system performance in unbalanced and distorted line voltage conditions is greatly improved by introducing the unbalance compensation and the voltage reconstruction blocks. Experiment results show the new scheme is effective.