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전압 불평형과 발전기 출력 변동을 이용한 분산전원의 단독운전 판단 기법
강용철(Yongcheol Kang),장성일(Sungil Jang),이지훈(Jihoon Lee),차선희(Sunhee Cha),김연희(Yeonhee Kim),이병은(Byungeun Lee),김용균(Yongguen Kim) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
Islanding operations of DG usually occur when power supply from the main utility is interrupted due to several reasons but the DG keeps supplying power into the distribution networks. These kinds of islanding conditions cause negative impacts on protection, operation, and management of distribution systems. Therefore, it is necessary to effectively detect the islanding conditions and swiftly disconnect DG from distribution network. This paper proposes the islanding detection algorithm for DG using the change of the voltage unbalance and the output power of DG. The proposed method effectively combines the conventional parameters for detecting the islanding conditions. The proposed methods were verified using the radial distribution network of IEEE 34 bus.
무효전력을 고려한 마이크로그리드의 단독운전 판단 알고리즘
강용철(Yongcheol Kang),장성일(Sungil Jang),차선희(Sunhee Cha),이병은(Byungeun Lee),김연희(Yeonhee Kim),이지훈(Jihoon Lee),김용균(Yongguen Kim) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
A microgrid is a new type of power system which is formed by the interconnection of small generator to distribution systems. Microgrids are able to supply electric power to their loads independently, which is called with islanding operation, even if they're separated from the power system. As a result, microgrids must be equipped with specific islanding detection schemes for the islanding operation of microgrids. This paper studies an islanding detection method considering reactive power. The proposed method is dealing with the reactive power of the cable which connects between a microgrid and a power system. To show the validity of the proposed method, many islanding operation cases are tested by varying the load conditions of microgrids.