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배전계통에서 태양광발전의 출력 특성을 고려한 분산전원 수용성 증대 방안 연구
윤광훈(Kwang-Hoon Yoon),신중우(Joong-Woo Shin),김재철(Jae-Chul Kim),문원식(Won-Sik Moon) 한국조명·전기설비학회 2021 조명·전기설비학회논문지 Vol.35 No.6
This study presents method to increase the hosting capacity considering output characteristics of photovoltaic (PV) generators in power distribution systems. The analysis of hosting capacity is conducted based on PV generators with large output volatility. The method for increasing hosting capacity is proposed in terms of overvoltage control at PCC voltage, thermal capacity of power distribution line, and interconnecting capacity of PV. The overvoltage of the distribution line according to power output of distributed generation can be controlled by applying a smart inverter with active and reactive power control functions. Currently, the thermal capacity standard of distribution lines follows the maximum normal operating capacity, but it is suggested to change it to the maximum emergency operating capacity. Through case studies, it appears that even if the maximum emergency operating capacity is applied to distribution line, the thermal capacity standard is not exceeded in the case of a smart inverter installed. This study reveals that there is no problem in the operation of the distribution systems even if the interconnection capacity of distributed generation changes from 10 [MVA] to 14 [MVA].
전력용 변압기의 상태를 고려한 온라인 가스분석 진단장치 설치시기에 관한 연구
윤광훈(Kwang-Hoon Yoon),이형진(Hyeong-Jin Lee),권동진(Dong-Jin Kweon),김재철(Jae-Chul Kim) 한국조명·전기설비학회 2020 조명·전기설비학회논문지 Vol.34 No.6
The DGA(Dissolved Gas Analysis) can diagnose the transformer state through the characteristic gas generated by the fault. Also, DGA can be used as an essential inspection because it can be measured even in operation. If the result of DGA is bad, the inspection cycle can be shortened and an on-line DGA equipment can be installed and operated for real-time inspection as needed. However, the lifetime of the on-line DGA equipment is shorter than the transformer, resulting in economic losses when installing simultaneously with the transformer. This paper analyzes the transformer lifetime and the lifetime of the on-line DGA equipment. Also, considering the number of alarms and the additional inspection cost according to the result of DGA, the appropriate installation time of the on-line DGA equipment is suggested.