Proceedings of the KIPE Conference (전력전자학회:학술대회논문집)

The Korean Institute of Power Electronics (전력전자학회)
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Capacitance Estimation of DC-Link Capacitors of PWM Converters using Input Current Injection

입력전류 주입을 이용한 PWM 컨버터의 직류 커패시터 용량 추정

  • Lee Kang-Ju (School of Electrical Engineering and Computer Science, Yeungnam University) ;
  • Lee Dong-Choon (School of Electrical Engineering and Computer Science, Yeungnam University) ;
  • Seok Jul-Ki (School of Electrical Engineering and Computer Science, Yeungnam University)
  • 이강주 (영남대학교 전자정보공학부) ;
  • 이동춘 (영남대학교 전자정보공학부) ;
  • 석줄기 (영남대학교 전자정보공학부)
  • Published : 2002.11.01
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Abstract

In this paper, a novel on-line do capacitance estimation method for the PWM converter is proposed. At no load, Input current at a low frequency is injected, which causes do voltage ripple. With the ac voltage and current ripple components of the dc side, the capacitance can be calculated. Experimental result shows that the estimation error is less than $2\%$.

Keywords