Analysis on Commutation Failure and DC Differential Protection Unwanted Action of Yunnan-Guangdong UHVDC

Abstract:

In order to reveal the commutation failure process and the reason for DC differential protection (87DCM) unwanted action of Yunnan-Guangdong UHVDC in 9.12^th 2012, and to lessen the unnecessary outage and guarantee a safe and stable operation, the 9.12 outage is deeply studied, including commutation failure phenomena and equivalent circuit analysis, high voltage DC current, low voltage DC current and their differential current analysis and reason for 87DCM unwanted action, and the final conclusions come out that: (1) 9.12 commutation failure includes V1 failing to communicate to V3 of Y bridge and V2 failing to communicate to V4 of D bridge; (2) during commutation failure process, high voltage DC current and low voltage DC current all raise rapidly and both contain DC component, AC component and no-circle rising component, and theoretically high voltage DC current equals to low voltage DC current; (3) failure in low pass filter circuit of pole 1 low voltage CT leads to measuring differential current between high voltage and low voltage DC current, and finally leads to unwanted action of 87DCM.

• Periodical: Applied Mechanics and Materials (Volumes 446-447)
• Pages: 784-789
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.446-447.784
• Online since: November 2013
• Authors: Hui Fan Xie, Guang Yuan Yang, Guang Qiang Peng, Xiao Peng Chen, Yan Zhou Chen, Dong Feng, Qi Wang, Yan Zhou Chen
• Keywords: Commutation Failure (CF), CT Characteristics, DC Differential Current, DC Differential Protection, Yunnan-Guangdong UHVDC

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DOI: 10.4236/epe.2013.54b233

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DOI: 10.4236/epe.2013.54b233