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차재훈,오진홍,Philemon MAHIRANE,박경원,안홍선,권경민,김재언 대한전기학회 2018 Journal of Electrical Engineering & Technology Vol.13 No.2
Distributed generation (DG) is being highlighted as an alternative for future power supplies, and the number of DG systems connected to conventional power systems is steadily increasing. DG generators are designed using power electronics and can give rise to various power quality problems, such as overvoltage or overcurrent. Particularly, unintentional islanding operation can occur in a conventional power system when the power grid is separated from the DG systems. Overvoltage may occur in this situation, depending on the power generation and power consumption. However, overvoltage phenomena might not happen even when islanding occurs. Therefore, it is necessary to analyze the fault characteristics during islanding. In this study, a fault analysis of islanding operation was carried out using PSCAD/EMTDC, and a countermeasure for the overvoltage problem is proposed.
A Stable Black-Start Strategy for a Stand-Alone DC Micro-Grid
Cha, Jae-Hun,Han, Yoon-Tak,Park, Kyung-Won,Oh, Jin-Hong,Choi, Tae-Seong,Ko, Jae-Hun,MAHIRANE, Philemon,An, Jae-Yun,Kim, Jae-Eon The Korean Institute of Electrical Engineers 2018 Journal of Electrical Engineering & Technology Vol.13 No.1
Unlike an AC system, a DC system does not cause problems with synchronization, stability, reactive power, system losses, and cost. However, more research is still required for the application of DC Systems. This paper proposes a stable black-start strategy for a stand-alone DC micro-grid, which consists of an energy storage system, photovoltaic generator, wind-turbine generator, diesel generator, and DC loads. The proposed method is very important for avoiding inrush current and transient overvoltage in the power system equipment during restoration after a blackout. PSCAD/EMTDC software was used to simulate, analyze, and verify the method, which was found to be stable and applicable for a stand-alone DC micro-grid.
A Stable Black-Start Strategy for a Stand-Alone DC Micro-Grid
Jae-Hun Cha,Yoon-Tak Han,Kyung-Won Park,Jin-Hong Oh,Tae-Seong Choi,Jae-Hun Ko,Philemon MAHIRANE,Jae-Yun An,Jae-Eon Kim 대한전기학회 2018 Journal of Electrical Engineering & Technology Vol.13 No.1
Unlike an AC system, a DC system does not cause problems with synchronization, stability, reactive power, system losses, and cost. However, more research is still required for the application of DC Systems. This paper proposes a stable black-start strategy for a stand-alone DC micro-grid, which consists of an energy storage system, photovoltaic generator, wind-turbine generator, diesel generator, and DC loads. The proposed method is very important for avoiding inrush current and transient overvoltage in the power system equipment during restoration after a blackout. PSCAD/EMTDC software was used to simulate, analyze, and verify the method, which was found to be stable and applicable for a stand-alone DC micro-grid.
Cha, Jae-Hun,Park, Kyung-Won,Ahn, Hong-Seon,Kwon, Kyoung-Min,Oh, Jin-Hong,MAHIRANE, Philemon,Kim, Jae-Eon The Korean Institute of Electrical Engineers 2018 Journal of Electrical Engineering & Technology Vol.13 No.2
Distributed generation (DG) is being highlighted as an alternative for future power supplies, and the number of DG systems connected to conventional power systems is steadily increasing. DG generators are designed using power electronics and can give rise to various power quality problems, such as overvoltage or overcurrent. Particularly, unintentional islanding operation can occur in a conventional power system when the power grid is separated from the DG systems. Overvoltage may occur in this situation, depending on the power generation and power consumption. However, overvoltage phenomena might not happen even when islanding occurs. Therefore, it is necessary to analyze the fault characteristics during islanding. In this study, a fault analysis of islanding operation was carried out using PSCAD/EMTDC, and a countermeasure for the overvoltage problem is proposed.
Jae-Hun Cha,Kyung-Won Park,Hong-Seon Ahn,Kyoung-Min Kwon,Jin-Hong Oh,Philemon MAHIRANE,Jae-Eon Kim 대한전기학회 2018 Journal of Electrical Engineering & Technology Vol.13 No.2
Distributed generation (DG) is being highlighted as an alternative for future power supplies, and the number of DG systems connected to conventional power systems is steadily increasing. DG generators are designed using power electronics and can give rise to various power quality problems, such as overvoltage or overcurrent. Particularly, unintentional islanding operation can occur in a conventional power system when the power grid is separated from the DG systems. Overvoltage may occur in this situation, depending on the power generation and power consumption. However, overvoltage phenomena might not happen even when islanding occurs. Therefore, it is necessary to analyze the fault characteristics during islanding. In this study, a fault analysis of islanding operation was carried out using PSCAD/EMTDC, and a countermeasure for the overvoltage problem is proposed.