Photovoltaic Multi-string PCS with a Grid-connection

계통연계형 멀티스트링 태양광 발전 시스템

  • 권정민 (포항공과대학교 전자전기공학과) ;
  • 김응호 (포항공과대학교 전자전기공학과) ;
  • 남광희 (포항공과대학교 전자전기공학과) ;
  • 권봉환 (포항공과대학교 전자전기공학과)
  • Published : 2007.12.21

Abstract

In this paper, a PV multi-string PCS with a grid-connection is proposed. An improved MPPT algorithm for the PV multi-string PCS is suggested. Each PV string has its own MPP tracker and the proposed MPPT algorithm prevents LMPP tracking due to power ripple. In the PV PCS with single-phase inverter has a large current ripple at twice the grid frequency. The current ripple reduction algorithm without external component is suggested. Also, this paper proposes a simple control method to achieve sharing of the PV string voltage and current among the interleaved parallel boost converters. All algorithms and controllers are implemented on a single-chip microcontroller. Experimental results obtained on a 3kW prototype show high performance of the proposed PV multi-string PCS.

Keywords