AR 모델 및 LSQ 기반 변류기 2차 전류 복원 기법

AR Model and LSQ Based Compensation Method for the Saturated Secondary Current of a Current Transformer

  • 발행 : 2006.06.01

초록

The current flowing though a power line is measured by a current transformer (CT). Since a CT is a kind of transformer, saturation of magnetic flux in the core may occur when a large primary current flows. This saturation makes the secondary current of a CT distorted and causes problems in the protection point of view. Because of the current distortion, a protection relay cannot collect the correct information showing how the primary power system changed. Consequently, the current distortion may cause the mal-operation or operation time delay of protective relay. In this paper, an algorithm based on AR model and LSQ is proposed to compensate the saturated CT secondary currents. Various test results indicate that the proposed algorithm can accurately compensate a severely distorted secondary current and is not affected by remanence.

키워드

참고문헌

  1. Yong Cheol Kang, Ui Jai Lim, Sang Hee Kang, Crossley, P.A., 'Compensation of the distortion in the secondary current caused by saturation and remanence in a CT', IEEE Transactions on Power Delivery, Volume 19, No. 4, Oct. 2004 pp. 1642 - 1649 https://doi.org/10.1109/TPWRD.2004.835266
  2. F. Li, Y. Li, R.K. Aggarwal, 'Combined Wavelet Transform and Regression Technique for Secondary Current Compensation of Current Transformers', IEE Proc. Gener. Transm. Distrib., Vol. 149, No. 4, July 2002, pp. 497-503 https://doi.org/10.1049/ip-gtd:20020296
  3. Xiao Li Yi, Sang Hee Kang, Dong Gyu Lee, Young Jin Kwon, 'A Compensation Algorithm for current Transformer Saturation', Proceedings of The International Conference on Electrical Engineering (ICEE2004), Sapporo, July 2004, pp. 371-376
  4. Sang-Hee Kang, Dong-Gyu Lee, Seung-Ho Hyun, Yong-Chel Kang, Charles J, Kim, 'A Current Compensation Algorithm for the Saturation of a CT', International Conference on Advanced Power System Automation and Protection(APAP2004), pp. 25-28, Jeju, Korea, October, 2004, pp. 376-380
  5. Y. C. Kang, S. H. Ok, S. H. Kang, 'A CT Saturation Detection Algorithm', IEEE Transactions on Power Delivery, Volume 19, No. 1, Jan. 2004 pp. 78 - 85 https://doi.org/10.1109/TPWRD.2003.820200
  6. M. Kezunovic, L. Kojovic, A. Abur, C. W. Fromen, F. Phillips, 'Experimental Evaluation of EMTP-Based Current Transformer Models for Protective Relay Transient Study', IEEE Trans. on PWRD, Vol. 9, No. 1, January 1994, pp. 405-413 https://doi.org/10.1109/61.277712