Single-Ended Protection for Flexible DC Transmission Line Based on Curvature of Initial Traveling Wave
Dai Zhihui1, Liu Ziqiang1, Liu Xueyan1, Yan Siqi2, Jiang Yan2
1. School of Electric and Electronic Engineering North China Electric Power University Baoding 071003 China; 2. State Grid Yangzhou Power Supply Company Yangzhou 225100 China
Abstract：Legacy traveling-wave protections are susceptible to low sensitivity and failure under high-impedance faults. First, based on quantitative analysis on the dispersion effect of the initial traveling wave on bipolar flexible DC transmission lines and its propagation characteristics at the line boundary, the expression of initial traveling wave was derived. The relationship between the bending degree of the initial traveling wave and the fault distance, as well as the fault resistance, was obtained. Second, the notable difference between the curvature of internal and external faults was utilized to construct the fault identification criterion, and the analytical expression of the initial traveling wave provides the theoretical basis for the threshold setting. Then, the integral ratio of fault and healthy-pole superimposed-currents was used to realize fault-pole selection. Combined with the identification criterion of lightning strikes, a complete single-ended protection scheme for flexible DC transmission lines was formed. Finally, simulation in PSCAD/EMTDC was carried out to verify the scheme. The results show that the proposed scheme with enhanced tolerance to transition resistance can distinguish internal and external faults quickly and reliably.
戴志辉, 刘自强, 刘雪燕, 严思齐, 姜妍. 基于首行波曲率的柔性直流输电线路单端量保护[J]. 电工技术学报, 2021, 36(9): 1831-1841.
Dai Zhihui, Liu Ziqiang, Liu Xueyan, Yan Siqi, Jiang Yan. Single-Ended Protection for Flexible DC Transmission Line Based on Curvature of Initial Traveling Wave. Transactions of China Electrotechnical Society, 2021, 36(9): 1831-1841.
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2021, Vol. 36 
