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

Korea Institute of Electronic Communication Science (한국전자통신학회)
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Compensation of Unbalanced Capacitor Voltage for Four-switch Three-phase Inverter Using DC Offset Current Injection

DC 오프셋 전류 주입에 의한 4-Switch 3-Phase Inverter의 커패시터 전압 불평형 보상

  • 박영주 (광운대학교 대학원 로봇학과) ;
  • 손상훈 (광운대학교 대학원 로봇학과) ;
  • 최익 (광운대학교 로봇학부)
  • Received : 2015.01.30
  • Accepted : 2015.03.23
  • Published : 2015.03.31
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Abstract

The performance of 4-switch 3-phase inverter(FSTPI) is mainly affected by the unbalanced voltages between two capacitors which replace two switches of conventional 6-switch 3-phase inverter(SSTPI). This paper proposes a DC offset current injection method to compensate the capacitor voltage unbalance for FSTPI. A simplified SVPWM method which can be applied to FSTPI is also proposed. The validity of the proposed methods is verified by computer simulation.

기존 6스위치 3상 인버터(SSTPI)의 한 상을 스위치 대신 커패시터로 대체한 4스위치 3상 인버터(FSTPI)에서 양 커패시터 전압의 불평형에 의한 출력전압의 오차를 보상하는 것은 FSTPI의 성능을 결정하는 중요한 요소이다. 본 논문에서는 DC 오프셋 전류 주입에 의하여 FSTPI의 커패시터 전압 불평형을 보상하는 새로운 방법과 FSTPI에 적용할 수 있는 간략화된 SVPWM 방법을 제안한다. 제안된 방법은 컴퓨터 시뮬레이션을 통해 타당성을 검증하였다.

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References

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