A shunt hybrid active filter with two passive filters in tandem

The harmonic related problems in electric utilities is increasing with the proliferation of nonlinear loads such as power converters in industrial applications. Filtering options such as passive, active and hybrid filters are countermeasures against these problems. In this study, a novel hybrid active filter topology with a new approach to enhance the system performance is presented. The proposed topology comprises two passive filter stages, in tandem, and an active filter in series. It improves the system efficiency and reduces VA ratings, hence, overall filtering cost. The system operation, control and experimental verification on a three phase diode bridge rectifier are presented