带有源滤波功能的PWM整流器预测直接功率控制研究

摘要

A predictive direct power control (P-DPC) strategy applied on a PWM rectifier with active power filtering function is proposed based on the same topology between PWM rectifier and the shunt active power filter (APF). Taking the output voltage of AC side of rectifier as the control object, the rectifier can not only supply energy to the load, but also operate as an APF to suppress the harmonic of power grid, so that the equipment utilization is improved. This control approach is combined with the space-vector modulation (SVM). Compared to the conventional DPC, the proposed strategy is simpler because it does not need switch table and phase-lock loop and its switching frequency is fixed. The stability of the proposed control scheme is examined through Lyapunov’s direct method. Finally the control strategy is proved correct and feasible by the simulation, which shows that the control system has good dynamic performance and robustness.%针对三相电压型PWM整流器和有源电力滤波器具有相同的拓扑结构，提出了一种预测直接功率控制（P-DPC）策略。以整流器交流侧输出电压为控制对象，使整流器不仅能够为负载提供能量，并兼具有源电力滤波器抑制电网谐波的功能，提高了设备的利用率。该控制策略与空间矢量脉宽调制相结合，与传统直接功率控制相比，不使用开关表和锁相环且开关频率固定，算法更为简单。李雅普诺夫稳定性分析证明了控制算法能够使系统全局渐进稳定。最后通过仿真验证了所提出的控制策略的正确性和可行性，仿真结果表明控制系统具有良好的动态性能和鲁棒性。