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태양광 성분별 발전 기여도를 적용한 태양광 시스템의 발전 효율 분석
이재덕(Jaydy Lee),김원기(Won-Ki Kim),김철환(Chul-Hwan Kim) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.11
Photovoltaic system is a kind of power generating system with solar light. The quantity of electricity generation, therefore, is fully dependent on the available quantity of solar light on the site. If utility can estimate the solar light of the site in advance, it may be possible to set up an appropriate solar system on the site. It may be also possible to objectively evaluate the efficiency of existing solar systems with the researched solar irradiance data. Based on the basic theories of astronomy and atmospheric radiation, in this paper, measured solar irradiance data are divided into its components, as beam radiation and diffused radiation. And they are applied to the prevailed photovoltaic systems so as to estimate the utilizable quantity of photovoltaic energy for each system. Consequently the optimal power generation condition of each photovoltaic system can be simulated, and the maximum quantity of power generation can be compared with each other.
Perez Model을 적용한 태양광 시스템 별 최적 설치 조건 및 최대 발전량 분석
이재덕(Jaydy Lee),김철환(Chul-Hwan Kim) 대한전기학회 2012 전기학회논문지 Vol.61 No.5
Photovoltaic(PV) system is one of power generation systems. Solar light in PV system is like the fuel of the car. The quantity of electricity generation, therefore, is fully dependent on the available quantity of solar light on the system of each site. If a utility can predict the solar power generation on a planned site, it may be possible to set up an appropriate PV system there. It may be also possible to objectively evaluate the performances of existing solar systems. Based on the theories of astronomy and meteorology, in this paper, Perez model is simulated to estimate the available quantity of solar lights on the prevailed photovoltaic systems. Consequently the conditions for optimal power generation of each PV system can be analyzed. And the maximum quantity of power generation of each system can be also estimated by applying assumed efficiency of PV system. Perez model is simulated in this paper, and the result is compared with the data of the same model of Meteonorm. Simulated site is Daejeon, Korea with typical meteorological year(TMY) data of 1991∼2010.
이재덕(Jaydy Lee),이상봉(Sang-Bong Rhee) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.11
The photovoltaic industry is growing at a tremendous speed. And it can be one of the key factors for success in the photovoltaic business to choose a suitable system, and setting it up right so as to get a maximum efficiency of the site. Therefore, it is regarded to be necessary to research the efficiency of systems to catch maximum photovoltaic energy. In this research, the expected power generation efficiencies are analysed, and compared with each other. This research considered the direct sunlight only, and the angle between the direction of solar panel and sunlight as factors to affect the power generation. Therefore, only rough analyses and estimations are found on 3 systems of fixed system, double-axes tracking system, and horizontal tracking system.
배전계통에서 지락 과전류 계전기의 오동작 원인분석 및 방지대책
박광원(Gwang-Won Park),서훈철(Hun-Chul Seo),이재덕(Jaydy Lee),최해술(Hea-Sul Choi),김철환(Chul-Hwan Kim) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
본 논문에서는 배전계통에서 발생할 수 있는 고조파에 의한 지락 과전류 계전기의 오동작 원인분석 및 방지대책을 분석하였다. 우선 EMTP(Electro-Magnetic Transients Program)를 이용하여 지락과전류 계전기를 모델링하였다. 모델링된 계전기를 연계하여 실 배전계통에 전력전자기기 투입에 따라 지락 과전류 계전기(OCGR)의 오동작을 분석하였다. 분석결과를 기반으로 SFCL(Superconducting Fault Current Limiter)을 이용하여 지락 과전류 계전기의 오동작을 방지할 수 있음을 확인하였다.