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방향성 계전기를 고려한 루프 배전계통 신뢰도 평가에 관한 연구
박진현(Jin-Hyun Park),조성민(Sung-Min Cho),조보현(Bo-Hyeon Cho),신희상(Hee-Sang Sin),김재철(Jae-Chul Kim) 대한전기학회 2010 전기학회논문지 Vol.59 No.11
Recently, the radial distribution system is operating as one-way power flow. These are popular because of their simple design and relatively low cost. However, radial systems are sensitive to outages due to single contingencies. Also, reliability of supply is becoming increasingly important. Accordingly, an appearance of the loop distribution system is inevitable and the other countries such as Macau, Florida, Taiwan are actively working on. The reliability of distribution system is estimated with reliability indices. In this paper, comparing with the radial distribution system, we evaluate and analyse the reliability of loop distribution system quantitatively considering directional relay.
조보현(Bo-Hyeon Cho),조성민(Sung-Min Cho),박진현(Jin-Hyun Park),신희상(Hee-Sang Sin),김재철(Jae-Chul Kim) 대한전기학회 2011 전기학회논문지 Vol.60 No.1
In this paper, we focused on the loop distribution system to solve the international issues of energy depletion and global warming. The conventional method of reconfiguration of distribution system was moving open points of switches from an actual switch position to another, while an appropriate switch must be opened to preserve the radial structure and this procedure is continued til there is no further loss reduction. However, the loop distribution system is the best optimization method to minimize loss than the other methods which is preserving radial structure. So we analyzed 3 types of loop distribution system upgraded from radial distribution system by changing normally open switch to normally closed switch. The simple 3 types of model system for simulation were composed, and each types of loop system were simulated in accordance with varying parameters. As a result of simulations, the loss reduction was different for each types of loop distribution system and each loop types have constraints for composing loop distribution system. The algorithms propose the method how to construct loop distribution system regarding constraints. Type I that needs least requirements get least loss reduction and Type III that needs most requirements get maximum loss reduction. On the other hand, Type I was most feasible distribution system to be realized.