一种三相混合电力滤波器控制方法的研究

介绍了由无源滤波器和有源滤波器组合构成的三相混合电力滤波器及其基本工作原理．针对传统控制方法的不足提出了复合控制方法，该方法同时检测负载侧和电网侧谐波电流，相应的控制系数KL、Ks可分别控制，控制KL可控制滤波器的谐波补偿特性，控制Ks可控制滤波器的谐振抑制特性．利用MATLAB进行了仿真研究，然后搭建实验样机进行了实验研究．结果表明，采用复合控制方法时，电网电流谐波含量大大减少，其中含量最多的5次谐波减小为原来的1／10左右．

New Control Method for Three Phase Hybrid Power Filter

A three-phase hybrid power filter composed of a passive filter and an active power filter, and the corresponding basic principles are introduced. To patch up the drawback of traditional control method, a new combined control method is proposed, where the load harmonic current and source harmonic current are detected simultaneously and the control ratios K L and K S can be controlled separately. By controlling K L the filtering performance of the hybrid filter can be controlled, and by controlling K S the resonance resisting performance of the hybrid filter can be controlled. The control method is simulated with MATLAB, and a prototype is built to verify the performance. Both the simulated and experimental results indicate that the source harmonic current is remarkably reduced, e.g., the dominated 5th order harmonic is reduced to about 1/10.