不平衡电网电压下三相四桥臂PWM整流器直流输出电压的二次谐波抑制

This article proposes a control strategy for three-phase four-leg PWM rectifier under unbalanced grid voltage conditions, which aims at achieving not only no second harmonic in dc output voltage, but also unity power factor operation for each phase. First, the amplitude-phase-locked loop is designed based on three-dimensional unbalanced coordinate transformation to detect the phases of three-phase...