A new PWM control technique applied to three-phase shunt hybrid power filter

This paper presents a new PWM control technique applied to a three-phase shunt hybrid power filter (SHPF). An appropriate control strategy for removing harmonics caused by nonlinear loads is developed. The PWM control technique adopted is based on two comparisons of a triangular high frequency carrier signal and the source harmonic currents. This harmonic signal namely +/spl thetav/ and its opposite value -/spl thetav/ are used, at the same instant, in the comparison process to generate the gate signals for the semiconductor devices. By using the averaging technique, the direct consequence of using this new PWM technique is that the transfer function of the active power filter (APF) becomes. a pure gain. Therefore the DC voltage regulator as well as the filter current controllers becomes easier to design. The Matlab PSB simulation results of the proposed technique highlight the performance of the controllers in terms of THD reduction and power factor correction.