Instantaneous Power Control of PWM Rectifier Using Hysteresis Regulator with Frequency Characteristic

Abstract

This paper proposes a hysteresis regulator with a frequency characteristic, which reduces specific harmonic power in a direct power control system of a current-source PWM rectifier. The method virtually adjusts the hysteresis bandwidth in association with frequencies of the power pulsation; hence the regulator is capable to filter specific frequency components of the input current as well as the power. The paper describes a theoretical aspect of the proposed approach, and presents some experimental results of a particular case, where the 5^th and the 7^th harmonic input currents are mainly suppressed by eliminating the 6^th harmonic component of the active power.