한국태양에너지학회 논문집 (Journal of the Korean Solar Energy Society)

  • 제37권6호
  • /
  • Pages.1-12
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  • 2017
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  • 1598-6411(pISSN)
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  • 2508-3562(eISSN)
한국태양에너지학회 (The Korean Solar Energy Society)
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오프셋 전압을 이용한 계통 연계형 3상 3레벨 T-type 태양광 PCS의 중성점 전압 불평형 보상

Compensation of Unbalanced Neutral Voltage for Grid-Connected 3-Phase 3-Level T-type Photovoltaic PCS Using Offset Voltage

  • 투고 : 2017.07.31
  • 심사 : 2017.12.14
  • 발행 : 2017.12.30
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초록

The DC link of Grid-Connected 3-Phase 3-Level T-type Photovoltaic PCS (PV-PCS) consists of two series connected capacitors for using their neutral voltage. The mismatch between two capacitor characteristics and transient states happened in load change cause the imbalance of neutral voltage. As a result, PV-PCS performance is degraded and the system becomes unstable. In this paper, a mathematical model for analyzing the imbalance of neutral voltage is derived and a compensation method using offset voltage is proposed, where offset voltage adjusts the applying time of P-type and N-type small vectors. The validity of the proposed methods is verified by simulation and experiment.

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참고문헌

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