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徐熏徹(Hun-Chul Seo),權五相(O-Sang Kwon),金喆煥(Chul-Hwan Kim),鄭昌守(Chang-Soo Jung),柳然杓(Yeon-Pyo Yoo) 대한전기학회 2006 전기학회논문지A Vol.55 No.7
If the three phases are not balanced, the current in neutral wire is not zero. Then, the induced voltage can be generated in communication line. The KEPCO's rule about unbalanced current for one step type in distribution pole is a twenty percent of phase current. But the unbalanced current for two step type in distribution pole can't decide the rule because there are many different views. This paper presents the calculation and analysis technique of neutral current in distribution poles using equivalent circuit analysis and EMTP simulation.
徐熏徹(Hun-Chul Seo),金喆煥(Chul-Hwan Kim),呂相敏(Sang-Min Yeo) 대한전기학회 2007 전기학회논문지 Vol.56 No.2
The autoreclosing is applied to power system for maintaining system stability and continuity of supply. Developments on distributed generation(DG) grows significantly by environmental issues and economical issues. If the DG is connected to distribution system, the DG influences the technical aspects such as power quality, protection and stability. It causes the challenges to protection, especially to reclosing. In order to achieve reliability and safety of the distribution system, the rules and guidelines suggest that the DG units should be rapidly disconnected from the network before the reclosing. If the DG is disconnected whenever the fault occurs, it cannot be utilized effectively. This paper presents the adaptive reclosing algorithm considering the DG. The algorithm consists of angle oscillation's judgment, EEEAC(Emergency Expanded Equal-Area Criterion), calculation of optimal reclosing time and re-connection algorithm. The simulation is implemented for the DG technology by using EMTP MODELS. The simulation results show that the transient stability is maintained and the DG is protected against disturbance.