DOI QR코드

DOI QR Code

Phasor Estimation Algorithm Based on the Least Square Technique during CT Saturation

  • Lee, Dong-Gyu (Department of Electrical Engineering, Myongji University) ;
  • Kang, Sang-Hee (Department of Electrical Engineering, Myongji University) ;
  • Nam, Soon-Ryul (Department of Electrical Engineering, Myongji University)
  • 투고 : 2010.11.29
  • 심사 : 2011.04.05
  • 발행 : 2011.07.01

초록

A phasor estimation algorithm based on the least square curve fitting technique for the distorted secondary current due to current transformer (CT) saturation is proposed. The mathematical form of the secondary current during CT saturation is represented as the scaled primary current with magnetizing current. The information on the scaled primary current is estimated using the least square technique, with the measured secondary current in the saturated section. The proposed method can estimate the phasor of a fundamental frequency component during the saturated period. The performance of the algorithm is validated under various fault and CT conditions using a C400 CT model. A series of performance evaluations shows that the proposed phasor estimation algorithm can estimate the phasor of the fundamental frequency component with high accuracy, regardless of fault conditions and CT characteristics.

키워드

참고문헌

  1. Y. C. Kang, J. K. Park, S. H. Kang, A. T. Johns and R. K. Aggarwal, "An Algorithm for Compensating the Secondary Current of Current Transformers", IEEE Trans. Power Delivery, vol. 12, no. 1, pp.116-124, Jan. 1997 https://doi.org/10.1109/61.568231
  2. N. Locci and C. Muscas, "A Digital Compensation Method for Improving Current Transformer Accuracy", IEEE Trans. Power Delivery, vol. 15, no. 4, pp. 1104-1109, Oct. 2000 https://doi.org/10.1109/61.891489
  3. N. Locci and C. Muscas, "Hysteresis and Eddy Current Compensation in Current Transformer", IEEE Trans. Power Delivery, vol. 16, no. 2, pp.154-159, April 2001 https://doi.org/10.1109/61.915475
  4. Y. C. Kang, U. J. Lim, S.H. Kang and P.A. Crossley, "Compensation of the Distortion in the Secondary Current Caused by Saturation and Remanence in a CT", IEEE Trans. Power Delivery, vol. 19, no. 4, Oct. 2004. https://doi.org/10.1109/TPWRD.2004.835266
  5. F. Li, Y. Li and R. K. Aggarwal, "Combined Wavelet Transform and Regression Technique for Secondary Current Compensation of Current Transformers", IEE Proc. Generation, Transmission and Distribution, vol. 149, no. 4, pp.497-503, July 2002. https://doi.org/10.1049/ip-gtd:20020296
  6. J. Pan, K. Vu and Y. Hu, "An Efficient Compensation Algorithm for Current Transformer Saturation Effects", IEEE Trans. Power Delivery, vol. 19, no. 4, pp. 1623-1628, Oct. 2004. https://doi.org/10.1109/TPWRD.2004.835273
  7. Soon-Ryul Nam, Jong-Young Park, Sang-Hee Kang and Mladen Kezunovic, "Phasor Estimation in the Presence of DC Offset and CT Saturation", IEEE Trans. Power Delivery, vol. 24, no. 4, pp. 1842-1849, Oct. 2009. https://doi.org/10.1109/TPWRD.2008.2002972
  8. Z. Lu, J. S. Smith and Q. H. Wu, "Morphological Lifting Scheme for Current Transformer Saturation Detection and Compensation", IEEE Trans. Circuits and Systems I: Regular Papers, vol. 55, no. 10, pp. 3349-3357, Nov. 2008 https://doi.org/10.1109/TCSI.2008.924112
  9. Y. C. Kang, S. H. Ok and S. H. Kang, "A CT Saturation Detection Algorithm", IEEE Trans. Power Delivery, vol. 19, no. 1, pp. 78-85, Jan. 2004 https://doi.org/10.1109/TPWRD.2003.820200
  10. M. Kezunovic, Lj. Kojovic, A. Abur, C. W. Fromen, D. R. Sevcik and F. Phillips, "Experimental evaluation of EMTP-based current transformer models for protective relay transient study", IEEE Trans. Power Delivery, vol. 9, no. 1, pp. 405-413, Jan. 1994 https://doi.org/10.1109/61.277712

피인용 문헌

  1. Compensation Method of Position Signal Error with Misaligned Hall-Effect Sensors of BLDC Motor vol.11, pp.4, 2016, https://doi.org/10.5370/JEET.2016.11.4.889
  2. Dynamic synchrophasor estimation by Taylor–Prony method in harmonic and non-harmonic conditions vol.11, pp.18, 2017, https://doi.org/10.1049/iet-gtd.2016.2041
  3. Least square and Kalman based methods for dynamic phasor estimation: a review vol.2, pp.1, 2017, https://doi.org/10.1186/s41601-016-0032-y
  4. Dynamic Phasors Estimation Based on Taylor-Fourier Expansion and Gram Matrix Representation vol.2018, pp.1563-5147, 2018, https://doi.org/10.1155/2018/7613814