Analysis of influence of initial phase angle of grid electromotive force on startup current of three-phase PWM rectifier

Abstract

The paper analyzed causes of startup inrush current of three-phase PWM rectifier, researched influence of initial phase angle of grid electromotive force and initial phase angle of AC side voltage on startup current, and proposed a method to use output of phase-locked loop to control initial phase angle of the grid electromotive force, which can avoid big startup current of a phase when starting, so as to make difference of three-phase AC currents between each other be not vary much. The experimental results verify correctness of the theoretical analysis and validity of the method.

Keywords

• three-phase pwm rectifier
• startup current
• grid electromotive force
• initial phase angle
• phase-locked loop