A Novel Pilot Protection for VSC-HVDC Transmission Lines Based on Correlation Analysis

Xingfu Jin, Guobing Song

School of Electrical Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, P. R. China.

DOI: 10.4236/epe.2013.54B224                

Abstract

The control system of voltage source converter HVDC (VSC-HVDC) is complex and its fault tolerance ability is not sufficient, and correct rate of line protection device is not high. A novel pilot protection for VSC-HVDC transmission lines based on correlation analysis is proposed in this paper. In the principle, external fault is equivalent to a positive capacitance model, so the correlation coefficient of the current and voltage derivative is 1; while the internal fault is equivalent to a negative capacitance model, so the correlation coefficient of the current and voltage derivative is -1. Internal faults and external faults can be distinguished by judging the correlation coefficient. Theoretical analysis and PSCAD simulation experiments show that the new principle, which is simple, not affected by transition resistance, control type and line distributed capacitance current, can identify internal faults and external faults reliably and rapidly, having certain practical value.

Keywords

VSC-HVDC; DC Transmission Lines; Correlation Coefficient; Pilot Protection

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	“HVDC & FACTS Group of Zhejiang University Power Generating Department, “DC transmission,” Beijing: Electric Power Industry Press, 1985, pp. 1-24.
[2]	G. F. Tang, “HVDC Transmission Technology Based Voltage Source Converter,” Beijing: China Electric Power Press, 2010, pp. 2-36.
[3]	Z. Xu and H. R. Chen, “Review and Applications of VSC HVDC,” High Voltage Engineering, Vol. 30, No. 1, 2007, pp. 1-10.
[4]	Z. Q. Hu, C. X. Mao, J. M. Lu, et al., “New High Voltage Direct Current Transmission Technology—— HVDC light,” Transactions of Chinese Electrotechnical Society, Vol. 20, No. 7, 2005, pp. 12-16．
[5]	G. Y. Li, P. F. Lv, G. K. Li, et al., “Development and Prospects for HVDC Light,” Automation of Electric Power Systems, Vol. 27, No. 4, 2003, pp. 77-80．
[6]	ABB, “ABB Solves 100-year-old Electrical Puzzle – New Technology to Enable Future DCgrid [eb/ol],” [2012-11-7].http://www.abb.com.cn/cawp/seitp202/8c6c07b41d96890648257ab0001f5ac3.aspx．
[7]	M. X. Han and J. Wen, “The Principle and Operation of HVDC,” Beijing: CHINA MACHINE PRESS, 2009, pp. 185-205.
[8]	ABB, “It’s Time to Connect-technical Description of HVDC Light Technology,” Sweden: ABB Power Technology, 2005．
[9]	G. B. Song, X. L. Cai, S. P. Gao, et al., “A New Current Differential Protection Principle of VSC-HVDC Considering Frequency-dependent Characteristic of Cable Line,” Proceedings of the CSEE, Vol. 31, No. 22, 2011, pp. 105-111.
[10]	G. B. Song, X. L. Cai, S. P. Gao, et al., “Directional Element for VSC-HVDC Transmission Lines Based on Model Identification,” Power System Protection and Control, Vol. 40, No. 7, 2012, pp. 78-83.
[11]	G. B. Song, X. L. Cai, S. P. Gao, et al., “New Pilot Protection for VSC-HVDC Transmission Lines Based on Natural Frequency Characteristic of Current,” High Voltage Engineering, Vol. 37, No. 8, 2011, pp. 1989-1996.
[12]	J. Suonan, C. Yang, Z. L. Yang, et al., “New Type of Transmission Line Pilot Protection Based on Model Identification,” Automation of Electric Power Systems, Vol. 32, No. 24, 2008, pp. 30-34.
[13]	S. Li, G. B. Song, X. N. Kang, et al., “Time-domain Fault Line Selection Based on Correlation Analysis in Neutral Indirect Ground System,” Power System Protection and Control, Vol. 36, No. 13, 2008, pp. 16-20.
[14]	Y. Z. Ge, “Principle and Technology of New Relay Protection and Fault Location,” Version 2. Xi’an: Xi’an Jiaotong University Press, 2007.
[15]	X. N. Kang, Z. Z. Wu, J. Suonan, et al., “Research of Suitable Frequency Band of Transmission Line Model Applied to Pilot Differential Protection Based on Parameter Identification,” Power System Protection and Control, Vol. 39, No. 19, 2011, pp. 8-16.