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Common-mode Voltage Reduction of Three Level Four Leg PWM Converter

3레벨 4레그 PWM 컨버터의 커먼 모드 전압 저감

  • Chee, Seung-Jun (Dept. of Electrical and Computer Eng., Seoul National Univ.) ;
  • Ko, Sanggi (Central Research Institute, Samsung Heavy Industries) ;
  • Kim, Hyeon-Sik (Dept. of Electrical and Computer Eng., Seoul National Univ.) ;
  • Sul, Seung-Ki (Dept. of Electrical and Computer Eng., Seoul National University)
  • Received : 2014.07.28
  • Accepted : 2014.09.04
  • Published : 2014.12.20

Abstract

This paper presents a carrier-based pulse-width modulation(PWM) method for reducing the common-mode voltage of a three-level four-leg converter. The idea of the proposed PWM method is intuitive and easy to be implemented in digital signal processor-based converter control systems. On the basis of the analysis of space-vector PWM(SVPWM) and sinusoidal PWM(SPWM) switching patterns, the fourth leg pole voltage of the three-phase converter called "f leg pole voltage" is manipulated to reduce the common-mode voltage. To synthesize f leg pole voltage for the suppression of the common-mode voltage, positive and negative pole voltage references of f leg are calculated. An offset voltage is also deduced to prevent the distortion of a, b, and c phase voltages. The feasibility of the proposed PWM method is verified by simulation and experimental results. The common-mode voltage of the proposed PWM method in peak-to-peak value is 33% in comparison with that of the conventional SVPWM method. The transition number of the common-mode voltage is also reduced to 25%.

Keywords

References

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