The Transactions of the Korean Institute of Power Electronics (전력전자학회논문지)

The Korean Institute of Power Electronics (전력전자학회)
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PWM Method with Low d-axis Current Ripple for reducing Input Current THD at Light Loads in Three Phase PWM Rectifier

3상 PWM 정류기의 경부하시 입력전류 THD 저감을 위한 d축 전류리플 저감 PWM 방법

  • Jin, Yong-Sin (Dept. of Control & Instrumentation Eng., Korea University of Transportation) ;
  • Shin, Hee-Keun (Technology Research Lab., VCTech.) ;
  • Kim, Hag-Wone (Dept. of Control & Instrumentation Eng., Korea University of Transportation) ;
  • Cho, Kwan-Yuhl (Dept. of Control & Instrumentation Eng., Korea University of Transportation)
  • Received : 2012.09.05
  • Accepted : 2012.09.24
  • Published : 2012.12.20
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Abstract

In this paper, a new PWM method is proposed to reduce the input current harmonics of 3 phase PWM rectifier. In the conventional carrier comparison PWM method, a triangular wave is generally used as the carrier wave. However, the large d-axis current ripple by the triangle carrier wave may be a source of large input current THD(Total Harmonic Distortion). In this paper, a new carrier comparison PWM method with saw tooth wave is proposed. Depending on the sector where the voltage command vector places, one of the rising or falling saw tooth wave is selected. To reduce the switching losses of the saw tooth carrier PWM, the discontinuous PWM is also presented. The proposed PWM method can reduce the d-axis current ripple as well as the switching losses. The performance of the conventional and proposed PWM methods is verified by the simulation and experimental results.

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References

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