The Identification of Internal and External Faults for ±800kV UHVDC Transmission Line Based on S-Transform and SVM

Abstract:

There is a smoothing reactor and DC filter between the inverter and the direct current line to form a boundary in the HVDC transmission system. Since this boundary presents the stop-band characteristic to the high frequency transient voltage signals, the high-frequency transient voltage signal caused by external faults through boundary will be attenuated and the signals caused by internal faults will be unchanged. In this paper, a new technique in which the combination of the S–transform and support vector machine (SVM) is used to analyze the transient signals, is proposed for distinguishing internal faults from the external faults based on the significantly difference of high-frequency transient voltage on the point of protection.

• Periodical: Advanced Materials Research (Volumes 433-440)
• Pages: 7138-7144
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.433-440.7138
• Online since: January 2012
• Authors: Hong Chun Shu, Xin Cui Tian, Yue Tao Dai
• Keywords: Boundary Unit, S-Transform, Support Vector Machine (SVM), UHVDC Transmission Line

References

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[14] [74] [1] correct ILLG.

[15] 358.

[1] correct ISG.

[58] 651.

[1] correct CF.

[41] [0] correct EF.

[24] [0] correct EF.

[74] [0] correct LS.

[36] 800.

[1] correct LS.

[67] 950.

[1] correct Note: ISG- single line to ground fault of internal; ILLG- line to line to ground fault of internal; CF- Commutation Failure; EF-external fault; LS- lighting strike.