철도 전력계통 불평형 보상을 위한 지그재그 변압기 개발

조규정; 박종영; 정호성; 한문섭; 이한민; 김형철

doi:10.5370/KIEE.2022.71.10.1474

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저널정보

대한전기학회
전기학회논문지 학술저널
전기학회논문지 제71권 제10호
2022.10 1,474 - 1,481 (8page)
DOI : 10.5370/KIEE.2022.71.10.1474

저자정보

조규정 (Korea Railroad Research Institute)
박종영 (Korea Railroad Research Institute)
정호성 (Korea Railroad Research Institute)
한문섭 (Korea Railroad Research Institute)
이한민 (Korea Railroad Research Institute)

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초록·키워드

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According to the government’s energy policy, distributed generation is likely to be operated in connection with the railway system in the future. Circulating current may occur under unbalanced conditions when using the existing non-standard interconnected transformer for the distributed generation, and this circulating current problem must be solved from the perspective of a distributed power provider in order to accommodate the needs of the power utility. In addition, as the load connected to the power system through the rectifier increases, the harmonic current caused in the neutral wire is also increasing, and there is a need to solve various relevant problems. Therefore, it is necessary to develop an auxiliary transformer (grounding transformer), which has multiple auxiliary roles (reduction of excessive circulating current, protection of non-grounding systems by providing effective grounding). The developed zigzag transformer has been verified its performance through a characteristic test and an accredited agency certification test after manufacture. In this paper, the design of the zigzag transformer and the modeling of it by using Power System Computer Aided Design (PSCAD) are described. Simple compensation verification of unbalance situation has been also shown.

#Distributed generator #Harmonics #Unbalanced system #Zigzag transformer