Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)

The Korean Institute of Electrical Engineers (대한전기학회)
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NPC Type 3 Level Inverter Operation in Overmodulation Region

NPC형 3레벨 인버터 과변조영역운전

  • Lee, Jae-Moon (School of Electrical and Computer Engineering Chungbuk National University) ;
  • Choi, Jae-Ho (School of Electrical and Computer Engineering Chungbuk National University) ;
  • Lee, Eun-Kyu (Woojin Industrial System) ;
  • Yeom, Sang-Gu (Woojin Industrial System)
  • 이재문 (충북대학교 전기전자컴퓨터공학부) ;
  • 최재호 (충북대학교 전기전자컴퓨터공학부) ;
  • 이은규 ((주)우진산전) ;
  • 염상구 ((주)우진산전)
  • Published : 2007.04.19
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Abstract

This paper proposes a linearization technique for the 3 level NPC type inverter, which increases the linear control range of inverter up to the 6-step inverter. The overmodulation range is divided into two modes depending on the modulation index(MI), In mode I, the reference angles are derived from the Fourier series expansion of the reference voltage corresponds to the MI. In mode II, the holding angles are also derived in the same way. Therefore, it is possible to obtain the linear control and the maximized utilization of PWM inverter output voltage.

Keywords