Journal of the Korean Solar Energy Society (한국태양에너지학회 논문집)

The Korean Solar Energy Society (한국태양에너지학회)
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Compensation of PV Module Current for Reduction of Mismatch Losses in PV Systems

태양광 시스템의 부정합 손실 저감을 위한 모듈 전류 보상 기법

  • Ahn, Hee-Wook (Dept. of Electronic Engineering, Kumoh National Institute of Technology) ;
  • Park, Gi-Yob (Dept. of Electronic Engineering, Graduate School, Kumoh National Institute of Technology)
  • 안희욱 (금오공과대학교 전자공학부) ;
  • 박기엽 (금오공과대학교대학원 전자공학부)
  • Received : 2012.01.31
  • Accepted : 2012.06.05
  • Published : 2012.06.30
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Abstract

A current compensation method to reduce the mismatch loss in PV systems is proposed as a way to increase the power generation efficiency. A dc-dc converter is used to supply currents to irregular modules in a PV string and is powered from the string output. The converter's voltage conversion ratio is adjusted so that all the modules in the string are operated at the maximum power point. The power rating and size of the converter can be reduced since only the current difference between the regular and irregular module may be supplied. The compensated string shows very little voltage mismatch compared to other regular strings. The validity of the proposed method is verified through a simulation and experiments in a prototype PV system.

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References

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