Applying a Novel Soft Switching Technique to Three-Phase Active Power Filter

摘要

Sinusoidal voltage and current are necessary in all systems with nonlinear loads. Nonlinear loads produce harmonic and reduce load current in low and medium voltage. The active power filters (APFs) play an essential role in reducing the destructive effects of these harmonics such as current harmonics. They are mostly used in low and medium voltage and are compensate harmonic current. The performance of APFs is based on the switching converters. Conventional power converters use pulse width modulation (PWM) control method under hard switching conditions. During the switching process, the switch should stand against the voltage and current simultaneously, which causes high switching losses and voltage stress. In this paper, a novel topology for APF is presented using a soft-switching converter with a quasi-resonant DC link. The aims are to increase the efficiency and reduce the losses and the volume of the circuit in order to decrease the costs.