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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。
Aiming at the problem of the size of active filter in hybrid active power filter, a novel topology of three-phase three-wire parallel hybrid active power filter is proposed. The passive filter for each phase in this hybrid active filter device is connected in series with a small additional inductor and this additional inductor is connected in parallel with the active filter through a single-phase coupling transformer. Among them, the active filter is controlled as a harmonic current source. This additional inductor provides the path for the fundamental current of the filter branch and reduces the active filter output voltage. Thus, the active filter capacity has been effectively reduced. The unified control strategy including load current detection, system current measurement and compound control is introduced in detail, and the capacity requirements of the active filter of the device are discussed. Finally, the experimental results of computer simulation and experimental prototypes confirm that the proposed new hybrid active filter topology and unified control strategy are feasible and effective.