Journal of the Korean Solar Energy Society (한국태양에너지학회 논문집)

The Korean Solar Energy Society (한국태양에너지학회)
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A Monitoring Unit for Lead Storage Batteries in Stand Alone PV Generation Systems

독립형 태양광 발전소의 연 축전지 모니터링장치 개발

  • Moon, Chae-Joo (Dept. of Electrical Engineering, Mokpo National University) ;
  • Kim, Tae-Gon (Research Center for New & Renewable Energy Technology, Mokpo National University) ;
  • Chang, Young-Hag (Dept. of Control System Engineering, Mokpo National University) ;
  • Kjm, Eui-Sun (Dept. of Information & communication Engineering, Shin-Gyeong University) ;
  • Lim, Jung-Min (Dept. of Electrical Engineering, Mokpo National University)
  • 문채주 (목포대학교 공과대학 전기공학과) ;
  • 김태곤 (목포대학교 신재생에너지기술연구센터) ;
  • 장영학 (목포대학교 공과대학 제어시스템공학과) ;
  • 김의선 (신경대학교 인터넷정보통신학과) ;
  • 임정민 (목포대학교 공과대학 전기공학과)
  • Published : 2009.04.30
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Abstract

Use of the PV(photovoltaic) generation system is increased in such areas as remote mountain places or islands at which electrical energy is not serviced. The stand alone PV system is required the power storage products such as battery, fly wheel and super capacitor. Several lead storage batteries are connected in series to get high voltages. The life of lead storage battery is shortened when over charge or over discharge takes place. So, it is needed to control batteries not to be overcharged or be discharged deeply. Voltage of each battery was ignored in former control methods in which overall voltage was used to control charge or discharge battery. In this study, the charging and discharging voltage variations of sealed lead storage batteries with l2V/l.2A were investigated step by step experiments. The results of the test show that one should consider and specify the state of each battery to prevent overcharge or deep discharge. With the basis of the experiments, we designed a monitoring unit to monitor battery voltages simultaneously using micro-controller. The unit measures voltage of 20 batteries simultaneously and displays data on the color LCD monitor with curved line graph. It also sends data to PC using the RS232C communication port. The designed unit was adapted to stand alone PV system with 1kW capacity and lead storage batteries are connected to the PV generation system. The number of lead storage batteries was 10 in series and 12V/250Ah each. Resistive load with 3kW was used for discharging.

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References

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