New Adaptive Hysteresis Modulation Technique for Three Phase Shunt Active Power Filter

Department of Electrical Power and Machines Faculty of Engineering Cairo University Giza, Egypt Abstract The quality of the current waveform generated by a current controlled, voltage source shunt active power filter depends basically on three factors: (i) The reference signal being generated; (ii) the modulation method used and (iii) the switching frequency of the PWM modulator. A new adaptive hysteresis band modulation method is proposed. In this paper, the periodical sampling constant hysteresis band modulation method and the proposed method are analyzed. These modulation methods are tested in switching an active power filter based on a voltage source topology, in a three phase three wire connections. They are compared in terms of THD of supply current, switching losses, and their flexibility of tuning. The simulation results demonstrate the viability and effectiveness of the new adaptive Hysteresis band modulation method in reducing the ripple, losses, and THD of supply current.