Study on Improving the Performances of Transformer and Convertor Switching Used for the High-Speed EMU

동력분산형 고속철도의 변압기 및 컨버터 스위칭 성능 개선 연구

In this research, studied were performance improvements of the power conversion system for the high speed EMU. The object of this research is separated into two parts ; the one is the analysis of the designed transformer and the other is the switching improvement of a parallel PWM converter. The multi-outputs of a transformer must be balanced. However, the output of transformer is interfered and unbalanced in practical operation. To solve these problems, the electromagnetic analyzing model of a transformer is used to minimize the output interference. Also, the improvement of converter switching can reduce the unbalanced output and harmonics.