Design of backstepping control for direct power control of three-phase PWM rectifier

Abstract

This study focuses on the backstepping control (BSC) design for the direct power control (DPC) of a three-phase voltage-source pulse-width-modulation (PWM) rectifier in the direct-quadrature (d-q) reference frame. Thus, the power factor of the three-phase rectifier can be adjusted by control the instantaneous reactive power and the DC output voltage simulatenously. In the proposed BSC system, it can be divided into two independent backstepping controllers by introducing two virtual control signals, and the corresponding controller parameters can be adjusted independently. As a result, both the stable DC output voltage and the sinusoidal input current with a lower total-harmonic-distorsioin (THD) value can be guaranteed. Moverover, the instantaneous active and reactive power also can be regulated. The effectiveness of the prosed BSC system is verified by numerical simulatios of a 5kW system.