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A Study on Control Algorithms of Efficiency Improvement Device for PV System Operation using Li-ion Battery

리튬이온전지를 이용한 태양광전원의 운용효율향상장치의 제어 알고리즘에 관한 연구

  • Park, Ji-Hyun (Department of Electrical Engineering, Korea University of Technology and Education) ;
  • Kim, Byung-Mok (Department of Electrical Engineering, Korea University of Technology and Education) ;
  • Lee, Hu-Dong (Department of Electrical Engineering, Korea University of Technology and Education) ;
  • Nam, Yang-Hyun (Department of Electrical Engineering, Korea University of Technology and Education) ;
  • Rho, Dae-Seok (Department of Electrical Engineering, Korea University of Technology and Education)
  • 박지현 (한국기술교육대학교 전기공학과) ;
  • 김병목 (한국기술교육대학교 전기공학과) ;
  • 이후동 (한국기술교육대학교 전기공학과) ;
  • 남양현 (한국기술교육대학교 전기공학과) ;
  • 노대석 (한국기술교육대학교 전기공학과)
  • Received : 2018.08.28
  • Accepted : 2018.10.05
  • Published : 2018.10.31

Abstract

Recently, the installation of PV systems has been increasing due to the worldwide interest in eco-friendly and renewable solar energy. On the other hand, the output power of PV systems is influenced strongly by the surrounding weather conditions. In addition, the entire operation efficiency of PV systems may be decreased considerably even if only some of the PV modules are in the shade. In other words, the existing control method at which strings with modules in series are connected to an inverter may be not operated in the case that the string voltage in partial shade is lower than the operating range of the grid connected inverter. To overcome these problems, this paper proposes an operation efficiency improvement device of a PV system using a Li-ion battery, which can compensate for the voltage of each string in the PV system when it is partially shaded. In addition, this paper presents the modeling of the operation efficiency improvement device, including PV strings, Li-ion battery and a 3-Phase grid inverter based on the PSIM S/W. From the simulation results, it was confirmed that the proposed control method can improve the operating efficiency of PV systems by compensating for the string voltage with partial shade.

Keywords

Grid connected Inverter;Li-ion battery;Operation efficiency improvement device;PSIM S/W;PV system;SOC

Acknowledgement

Supported by : 한국에너지기술평가원

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