The Transactions of The Korean Institute of Electrical Engineers (전기학회논문지)

The Korean Institute of Electrical Engineers (대한전기학회)
권호 표지

DC-Link Capacitance Estimation using Support Vector Regression in AC/DC/AC PWM Converters

SVR을 이용한 AC/DC/AC PWM 컨버터의 직류링크 커패시턴스 추정

  • Published : 2007.01.01
Download PDF
⟨ Previous Next ⟩

Abstract

This paper proposes a new capacitance estimation scheme for a DC-link capacitor in a three-phase AC/DC/AC PWM converter. A controlled AC voltage with a lower frequency than the line frequency is injected into the DC-link voltage, which then causes AC power ripples at the DC side. By extracting the AC voltage and power components on the DC output side using digital filters, the capacitance can then be calculated using the Support Vector Regression (SVR). By training of SVR, a function which relates a given input (capacitor's power) and its corresponding output (capacitance value) can be derived. This function is used to predict outputs for given inputs that are not included in the training set. The proposed method does not require the information of DC-link current and can be simply implemented with only software and no additional hardware. Experimental results confirm that the estimation error is less than 0.16%.

Keywords

References

  1. Y. Yang, M. Kazerani and V. H. Quintana, 'Realization of a smart electrolytic capacitor circuit', IEEE Trans. Power Electron., vol. 18, no. 3, pp. 857-864, May. 2003 https://doi.org/10.1109/TPEL.2003.810860
  2. 이동춘, 김형진, '인버터용 전해 커패시터의 수명 추정', 전기학회 논문지, 50B권 7호, pp. 338-346, 2001
  3. G. S. Parler, 'Selecting and applying aluminum electrolytic capacitors for inverter applications', Cornell-Dubilier Electric Corp. www.comell-dubilier.com
  4. D. Rendusara, E. Cengelci, P. Enjeti and D. C. Lee, 'An evaluation of the DC-link capacitor heating in adjustable speed drive systems with different utility interface options', IEEE APEC Proc., vol. 2, pp. 781-787, March 1999
  5. M. Gasperi, 'A method for predicting the expected life of bus capacitors', IEEE IAS Conf. Proc., vol. 2, pp.1042-1047, 1997
  6. K. Harada, A. Katuski and M.Fujiw, 'Use of ESR for deterioration diagnosis of electrolytic capacitors', IEEE Trans. on Power Electron., vol, 8, no. 4, pp. 1199-1207, Oct. 1993 https://doi.org/10.1109/61.252645
  7. E. Aeloiza, ]ang-Hwan Kim, P. Enjeti and P. Ruminot, 'A real time method to estimate electrolytic capacitor condition in PWM adjustable speed drives and uninterruptible power supplies', IEEE PESC Conf., pp. 2867-2872, 2005
  8. V. A. Sankaran, F. L. Rees, and C. S. Avant, 'Electrolytic capacitor life testing and prediction', IEEE lAS Conf. Proc., vol. 2, pp. 1058-1065, Oct. 1997
  9. D. C. Lee, K. J. Lee, J. K. Seok and J. W Choi, 'Online capacitance estimation of DC-link electrolytic capacitors of three-phase AC/DC/DC PWM converters using recursive least square method', IEE Proc. Electric Power Applications, vol. 152, no. 6, pp. 1503-1508, Nov. 2005
  10. 기초전력공학동동연구소, 전동기 구동시스템의 설계 및 실습, 제 10회 하계교육강좌, 2000
  11. V. Cherkassky and F. Miller, Learning from data concepts, theory and methods, Wiley, 1998
  12. S. R. Gun 'Support vector machine for classification and regression', Technical Report, University of Southhampton, 1998
  13. A. J. Smola and B. Scholkopf, 'A tutorial on support vector regression,' Statistics Comput., vol. 14, no. 3, pp. 199-222, Aug. 2004 https://doi.org/10.1023/B:STCO.0000035301.49549.88
  14. V. Vapnik, S. Golowich and A. Smola, 'Support vector method for function approximation, regression estimation, and signal processing', Cambridge, MA, 1997. MIT Press