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Performance Analysis of Photovoltaic Power Generator by Usage Battery Charge

축전지 사용 유무에 따른 태양광발전기의 성능 분석

  • Yun, Sung Wook (Institute of Agriculture & Life Science, Gyeongsang National University) ;
  • Choi, Man Kwon (Institute of Agriculture & Life Science, Gyeongsang National University) ;
  • Kim, Hyeon Tae (Dept. of Bio-Industrial Machinery Eng., Gyeongsang National Univ. (Institute of Agriculture and Life Science)) ;
  • Yoon, Yong Cheol (Dept. of Agricultural Eng., Gyeongsang National Univ. (Institute of Agriculture and Life Science, GNU))
  • 윤성욱 (경상대학교 농업생명과학연구원) ;
  • 최만권 (경상대학교 농업생명과학연구원) ;
  • 김현태 (경상대학교 생물산업기계공학과(농업생명과학연구원)) ;
  • 윤용철 (경상대학교 지역환경기반공학과(농업생명과학연구원))
  • Received : 2013.07.01
  • Accepted : 2013.07.29
  • Published : 2013.09.30

Abstract

This study examined the electric power quantity derived from solar radiation after installing a photovoltaic power generation system on the rooftop of building adjacent to a greenhouse with a view to reducing the operating expenses of the greenhouse by securing electric energy required to run it. Results of the study can be summed up as follows: The maximum, mean, and minimum solar radiation on the horizontal plane was $26.1MJ{\cdot}m^{-2}$, $14,0MJ{\cdot}m^{-2}$, and $0.6MJ{\cdot}m^{-2}$, respectively and individual the daily electric energy generated was about 6.1 kWh, 3.7 kWh, and 0.01 kWh. The cumulative total amounts of solar radiation and electric energy was about $4,378.2MJ{\cdot}m^{-2}$ and 1,163.2 kWh, respectively. Maximum, mean and minimum cumulative electric energy consumed through each load respectively was 4.5 kWh, 2.4 kWh, and 0.0 kWh and the cumulative electric energy were 739.2 kWh, which accounted for about 63.5% of generated power. In case of the mean amount of power consumption of the system used for this study, the small capacity of heater and the short operating hours meant there was enough power; while big capacity of heater led to a shortage, and if the array surface temperature increased relatively, the energy became proportionate to solar radiation and generated power does not increase. The correlation coefficient between the two factors was 0.851, which indicates a high correlation coefficient.

본 연구는 온실 운영에 필요한 전력량을 확보함으로서 온실경영비 절감을 목적으로 태양광발전시스템을 온실에 인접한 건물의 옥상에 설치하여 일사량에 따른 발전량을 실험적으로 검토하였다. 연구결과를 요약하면 다음과 같다. 실험기간 동안 수평면 일사량의 최대, 평균 및 최소값은 각각 $26.1MJ{\cdot}m^{-2}$, $14.0MJ{\cdot}m^{-2}$$0.6MJ{\cdot}m^{-2}$ 정도였고, 일일 전력량은 각각 약 6.1kWh, 3.7kWh 및 0.01kWh 이었다. 그리고 누계 일사량과 전력량은 각각 약 $4,378.2MJ{\cdot}m^{-2}$ 및 1,163.2kWh 정도이었다. 그리고 부하에 의해 소비된 적산전력량의 최대, 평균 및 최소값은 각각 4.5kWh, 2.4kWh 및 0.0kWh 정도이었고, 누계전력량은 739.2kWh 정도로서 발생 전력량의 약 63.5%에 해당하였다. 본 실험에 사용된 시스템의 평균 소비전력량을 기준으로 보면, 온풍기의 용량 및 작동시간이 작은 경우는 충분하지만 큰 경우는 부족한 것으로 나타났다. 어레이 표면온도가 상대적으로 높아지면 일사량에 비례해서 발생 전력이 증가하지 않은 것으로 나타났지만, 두 인자 간에 상관계수는 0.851 정도로서 상관관계가 높은 것으로 나타났다.

Keywords

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