Shunt-series active power filter for rectifiers AC and DC sides

The authors present a feasibility study of a shunt-series active power filt er to be used with three-phase thyristor controlled rectifiers. The propose d active filter is based on two active power units: one shunt filter connec ted to the AC side and one series filter connected to the DC side of the re ctifier. The filters may have a common DC link and the shunt filter is cont rolled using the concepts of the instantaneous real and imaginary powers (p -q power theory). The series filter is controlled in such a way as to cance l the output voltage ripple of the rectifier. Digital simulation results ob tained from an electromagnetic transient program (EMTP) are presented to va lidate this study. Experimental results obtained with a small-scale laborat ory prototype consisting of shunt and series filter operating separately ar e also presented to show their benefits.