Hybrid Power Balancing Method of Modular Power Converters to Achieve Enhanced Efficiency and Dynamic Performance

Abstract

In general, the master-slave output power balancing method has widely been used to stabilize parallelconnected modular power converters. However, it cannot consider the performance deviation among the modular power converters due to different stress and aging. Moreover, it degrades the dynamic performance of the modular power converters and induces the current oscillation due to different loop gains of the voltage control loop and the current sharing loop. In this paper, a hybrid power balancing method for the modular power converters is proposed to obtain enhanced efficiency and dynamic performance. It can increase the entire power conversion efficiency using an input power balancing strategy in the steady-state operation. In addition, it can enhance the dynamic performance of the entire converters by using an interleaving control strategy in the transient-state operation. The performance enhancement of the proposed method is verified by using a comparative study and experimental results.