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混合有源滤波器是一种有效的谐波抑制方式。电力系统中谐波源负载种类繁多,特性各异,针对目前应用最为广泛的三相整流桥负载,在以往混合滤波器研究的基础上,提出了一种新型单调谐混合滤波器,对其无源滤波部分依据有源部分容量最小的原则进行了设计,并对其工作原理进行了详细的分析研究。针对所设计的混合滤波器的特有结构,设计了其复合控制策略。该复合控制策略在不影响系统稳定性的基础上,提高了系统的滤波性能,保证了有源滤波器小容量下良好的运行性能。对所设计的复合控制器在频域和时域内进行了稳定性分析。仿真和实验结果验证了所提出的拓扑结构和复合控制策略的有效性。
Hybrid active filter is an effective harmonic suppression method. Due to the wide variety of harmonic source loads and different characteristics in power system, aiming at the most widely used load of three-phase rectifier bridge, a new type of single-tuned hybrid filter is proposed based on the previous hybrid filter. The part of the source filter is designed according to the principle of the smallest capacity of the active part, and its working principle is analyzed in detail. Aiming at the peculiar structure of the designed hybrid filter, the compound control strategy is designed. The composite control strategy not only improves the stability of the system, but also improves the filtering performance of the system and ensures the good operation performance under the small capacity of the active filter. The stability of the designed composite controller in frequency domain and time domain was analyzed. Simulation and experimental results verify the effectiveness of the proposed topology and composite control strategy.