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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.

has been cited by the following article:

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

  AUTHORS: Xingfu Jin, Guobing Song

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

  JOURNAL NAME: Energy and Power Engineering, Vol.5 No.4B, November 15, 2013

  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.