반도체디스플레이기술학회지 (Journal of the Semiconductor & Display Technology)

한국반도체디스플레이기술학회 (The Korean Society Of Semiconductor & Display Technology)
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계통연계형 3상 3레벨 태양광 인버터의 중성점 전압제어

Neutral Point Voltage Control for Grid-Connected Three-Phase Three-Level Photovoltaic Inverter

  • 박운호 (청주대학교 반도체공학과) ;
  • 양오 (청주대학교 반도체공학과)
  • Park, Woonho (Semiconductor Engineering of Cheong-ju University) ;
  • Yang, Oh (Semiconductor Engineering of Cheong-ju University)
  • 투고 : 2015.11.30
  • 심사 : 2015.12.21
  • 발행 : 2015.12.31
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초록

Three-level diode clamped multilevel inverter, generally known as neutral point clamped (NPC) inverter, has an inherent problem causing neutral point (NP) potential variation. Until now, the NP potential problem of variation has been investigated and lots of solutions have also been proposed. This paper presents a neutral point voltage control technology using the anti-windup PI controller and offset technology of PWM (Pulse Width Modulation) to control the variation of NPC 3-phase three-level inverter neutral point voltage. And the proposed algorithm is tested and verified using a PLL (Phase Locked Loop) in order to synchronize the phase voltage from the line voltage of grid. It significantly improves the voltage balancing under a solar fluctuation conditions of the inverter. Experimental results show the good performance and effectiveness of the proposed method.

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참고문헌

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