The Transactions of the Korean Institute of Power Electronics (전력전자학회논문지)

The Korean Institute of Power Electronics (전력전자학회)
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An Output Voltage Balance Control of Grid Connected Inverter by Phase Current Control at Critical Load Unbalanced Condition

계통연계 인버터의 주요 부하 불평형 시 상전류 제어를 통한 부하 상전압 평형 제어

  • Tae-Hyeon Park (Dept of Electronic Engineering, Korea Nat'l Univ. of Transportation) ;
  • Hag-Wone Kim (Dept. of Electronic Engineering., Korea Nat'l Univ of Transportation) ;
  • Kwan-Yuhl Cho (Dept of Electronic Engineering, Korea Nat'l Univ. of Transportation) ;
  • Joon-Ki Min (R&D Center Solar&Sys Co.,Ltd. ) ;
  • Won-Il Choi (R&D Center MAK Co.,Ltd.)
  • Received : 2022.08.29
  • Accepted : 2022.09.13
  • Published : 2023.02.20
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Abstract

A grid-connected inverter can be used in grid-connected or stand-alone modes. Generally, a grid-connected inverter operates in a grid-connected mode, but the inverter operates in stand-alone mode if grid faults occur. In the stand-alone mode, the grid-connected inverter must supply electric power to a critical load that needs to receive stable power even though grid faults occur. Generally, three-phase loads are used as critical loads, but a single phase is configured in some cases. In these conditions, the critical load is required to unbalance the load power consumption, which makes the three-phase load voltage unbalancd. This unbalanced voltage problem can cause fatal problems to the three-phase critical loads, and thus must be addressed. Hence, this paper proposes an algorithm to solve this unbalanced voltage problem by the individual phase current control. The proposed method is verified using Psim simulation and experiments.

Keywords

Acknowledgement

이 논문은 2021년도 정부(교육부)의 재원으로 한국연구재단의 지원을 받아 수행된 기초연구사업임(No. 2021R1I1A3048301) 이 논문은 중소벤처기업부 기업연계형 연구개발 인력양성사업 (과제명 : 수송용에너지저장시스템, No. S3282477) 연구비 지원을 받아 수행한 과제입니다.

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