Suppression method of circulating current in SPWM inverters parallel system based on adjustment of phases of triangular carrier waves
Liu Jian-ba · Journal of Naval University of Engineering · 2014
Aiming at the circulating current in the SPWM inverters parallel system for AC motor drive,this paper proposes a suppression method of circulating current based on the relationship between the circulating current and phase difference of carrier waves.The direction of the phase difference of carrier waves is determined according to the principle of the minimal accommodation,and then the value of the phase difference is computed according to the relationship between the DC circulating current and the phase difference of carrier waves.The adjustment of the lagging phase of the anterior triangular carrier wave according to the phase difference and the direction of triangular carrier wave can suppress the circulating current effectively.The simulation result proves the proposed method to be effective and feasible.