Reactive component injection control of the modular multi-output power electronic transformer

Abstract

Power Electronic Transformer(PET) is a promising component in the future power system. The modular PET is the most attractive due to its high voltage level and flexible function. Unfortunately, when the modular PET is driving multiple loads, there would be overmodulation issue in the AC-DC stage caused by the unbalanced load power. This paper proposed a reactive component injection control strategy to prevent overmodulation for a three-module PET under unbalanced load. Two specific algorithms are proposed. The effectiveness of the proposed control strategy and the two algorithms are verified by simulation results.