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재생에너지 연계를 위한 배전계통 수학적 모델링에 관한 연구
이문정(Moonjeong Lee),윤명석(Myungseok Yoon),최승연(Sungyun Choi) 한국조명·전기설비학회 2021 조명·전기설비학회논문지 Vol.35 No.12
Recently, the ratio of renewable energy sources in the distribution system has been increased in order to address the problems of environmental pollution and fossil fuel depletion. However, the growth of renewable energy sources in the distribution system can cause various issues such as load unbalance, reverse power flow and power system instability. Therefore, in this paper, mathematical modeling of main components of distribution system was performed in both the frequency domain and the time domain. The results of mathematical modeling were verified by using MATLAB/Simulink and OpenDSS.
정지기 기반 분산형 전원 연계변압기 결선을 고려한 고장해석
윤명석(Myungseok Yoon),이문정(Moonjeong Lee),조남훈(Namhun Cho),최승연(Sungyun Choi) 대한전기학회 2021 전기학회논문지 Vol.70 No.9
For conducting the fault analysis in a system with distributed generation, the sequence equivalent circuit is used. Due to the characteristics of distributed generation that reverse currents occur, the size of the fault current can be determined by the path where fault current can flow into the fault point in the negative sequence and zero sequence. In this paper, we calculate and compare the fault currents in the system with inverter-based distributed generation considering the topology of transformer winding. From the results, we can analyze the effect of the interconnection transformer in the fault analysis.