The Journal of the Korea institute of electronic communication sciences (한국전자통신학회논문지)

Korea Institute of Electronic Communication Science (한국전자통신학회)
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A Study on the Synchronization Methodology for Grid-connection of Three Phase Inverter

3상 인버터의 계통 연계를 위한 동기화 방법론에 대한 연구

  • 임병석 (남서울대학교 전자공학과) ;
  • 이준성 (남서울대학교 전자공학과) ;
  • 웬황난 (남서울대학교 전자공학과) ;
  • 잔반탄 (남서울대학교 전자공학과) ;
  • 고윤석 (남서울대학교 전자공학과)
  • Received : 2019.09.16
  • Accepted : 2019.10.15
  • Published : 2019.10.31
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Abstract

For the power grid-connection of distributed generation, the output voltage of the distributed generation must be synchronized with the grid voltage before the grid-connection. In this paper, a vector control based synchronization algorithm was developed for grid linkage of three-phase inverters. A three-phase voltage inverter was designed and fabricated to verify the effectiveness of the developed algorithm. The main controller of the three-phase inverter was developed based on DSP, and the electrical level of the system was set to an electrical level that can be tested in the laboratory. Throughout the experiments, it was confirmed that the proposed algorithm could be used as a synchronization algorithm for grid-connection by showing that the output voltage of the three-phase inverter is synchronized with the grid voltage.

분산 전원의 계통 연계를 위해서는 연계 전에 분산 전원 출력전압을 계통전압과 동기화시켜야 하는데, 전압의 크기, 위상 그리고 주파수를 일치시키는 문제이기 때문에 쉽지 않다. 본 연구에서는 3상 인버터의 계통 연계를 위한 벡터제어 기반의 동기화 알고리즘을 개발하였다. 하나의 3상 전압형 인버터를 설계, 제작하여 개발된 알고리즘의 유효성을 검증하였다. 3상 인버터의 주제어장치는 DSP 기반으로 개발되었고, 계통의 전기적인 레벨은 실험실에서 실험이 가능한 전기적 레벨로 하였다. 그리고 실험을 통하여 3상 인버터의 출력전압이 계통전압을 추종하여 동기화를 이루는 것을 보임으로서 제시된 알고리즘이 계통 연계를 위한 동기화 알고리즘으로 활용될 수 있음을 확인될 수 있었다.

Keywords

References

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