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박정은(Jeong-Eun Park),김형승(Hyung-Seung Kim),최면송(Myeon-Song Choi),이승재(Seung-Jae Lee),임성일(Seong-Il Lim),현승호(Seung-Ho Hyun) 대한전기학회 2016 전기학회논문지 Vol.65 No.8
This paper identifies the issues of contingency analysis for restoration in distribution systems. Contingency analysis has been applied to transmission systems but not to distribution systems. The distribution system is different from transmission system. So it is hard to apply for existing contingency analysis to distribution system. In this paper, a new contingency analysis method for distribution systems is proposed. The proposed method is based on service restoration capability. It aims to minimize outage left after service restoration in case of a fault in advance. The method estimates the vulnerability which is represented by zone restoration index proposed in. Applying the proposed method, operators could change the system so that it does not leave any outage left after restoration. Case study has been carried out on a five feeder system and its results show effectiveness of the method.
배전자동화시스템에서 전류방향성을 이용한 단말장치의 고장표시 오류 개선 방법
서정수(Jung-Soo Seo),김형승(Hyung-Seung Kim),임성일(Seong-Il Lim),최면송(Myeon-Song Choi),이승재(Seung-Jae Lee) 대한전기학회 2014 전기학회논문지 Vol.63 No.10
In this paper, an improved method of fault indicator generation algorithm in FRTUs is proposed for the present Distribution Automation System. In order to find fault area, correct FI information should be generated. But when a single line-to-ground fault occurs, FI information is generated in downside of the fault in some circumstance because existing FI algorithm considers only magnitude. It is found that the upside fault current direction if different from the downside fault current direction. Therefore, in order to prevent to generate the wrong fault indication information for FRTU at the downside of the fault, an improved fault indication generation method is developed. Not only the basic conditions are taken into account, but also the directions from the angle difference between zero and positive sequence currents are considered to generated the fault indication information. In case study, the proposed method has been testified and shown the reasonability in generating correct the fault indication information. for many kinds of faults according to conditions.
배전자동화 중앙장치에서 필터링 알고리즘을 통한 고장표시 오류 개선방법
서정수(Jung-Soo Seo),김형승(Hyung-Seung Kim),임성일(Sung-Il Lim),최면송(Myeon-Song Choi),이승재(Seung-Jae Lee) 대한전기학회 2015 전기학회논문지 Vol.64 No.10
In this paper, an filtering method of FI(Fault Indication) information generated by FRTU(Feeder Remote Terminal Unit)s is proposed for the present DAS(Distribution Automation System). In order to find fault area, correct FI information should be generated. But when a single line-to-ground fault occurs, FI information is generated in downside of the fault in some circumstance because existing FI algorithm considers only magnitude. These wrong FI information can be removed by changing existing algorithm. An improved algorithm considers both the direction of zero-sequence current and the phase of three-phase current&voltage. But many FRTUs are distributed in DAS and Changing the algorithm all of FRTU will spend a lot of time and cost. On the other hand, an filtering algorithm proposed in this paper can substitute for it. The filtering algorithm also considers both the direction of zero-sequence current and the phase of three-phase current&voltage. In case study, the proposed method has been shown the reasonability in filtering the fault indication information.