新型混合有源滤波装置的电流控制策略研究

针对混合有源电力滤波装置中有源滤波部分容量大小的问题,提出一种三相三线制并联型混合有源电力滤波装置的新型拓扑结构.这种混合有源滤波装置中每一相的无源滤波器与一个小的附加电感串联,并且这个附加电感通过一个单相耦合变压器与有源滤波器并联.其中,有源滤波器被控制成一个谐波电流源.这个附加电感为滤波支路的基波电流提供了通路,并且能够减小有源滤波器的输出电压.因而,有源滤波器的容量得到了有效的降低.详细介绍了包括负载电流检测、系统电流电测和复合控制的统一控制策略,并且讨论了该装置的有源滤波器的容量要求.最后,计算机仿真结果和实验样机的实验结果证实了所提出的新型混合式有源滤波器拓扑结构和统一控制策略是可行的并且是有效的.

Research on the current control strategy of a novel hybrid active filter

In this paper,a novel topology of parallel hybrid active filter for three-phase circuit was presented.The proposed hybrid active filter is comprised of a passive filter series connected with an additional small-rated reactance in each phase,which is parallel connected with the active filter by a coupling single-phase transformer.The active filter is controlled as a harmonic current source.The additional reactance provides a passage for the fundamental current of the filter branch and reduces the output voltage of the active filter.Thus the VA ratings of the active filter can be reduced effectively.The unified control strategy,which covers load current detection method,source current detection method,and compound control method,was presented.The capacity requirement of the active filter was also discussed.The feasibility and validity of the proposed topology and the unified control strategy have been verified by the computer simulation and experimental results in a laboratory prototype.