DAI Zhihui,LIU Ningning,LIU Yuan,et al.Single-terminal line protection for UHVDC power transmission based on voltage backward traveling wave[J].Electric Power Automation Equipment,2019,39(09):80-87.
DAI Zhihui,LIU Ningning,LIU Yuan,et al.Single-terminal line protection for UHVDC power transmission based on voltage backward traveling wave[J].Electric Power Automation Equipment,2019,39(09):80-87.DOI: 10.16081/j.epae.201909004.
Single-terminal line protection for UHVDC power transmission based on voltage backward traveling wave
In view of the shortages of traditional current differential protections for UHVDC(Ultra High Vol-tage Direct Current) transmission lines,such as poor tripping speed and limited adaptability to high-resistance faults,a single-terminal line protection based on voltage backward traveling wave is proposed. Consi-dering the attenuation impacts of both line boundary and UHVDC lines on high-frequency voltage trave-ling wave,the transmission characteristics of traveling wave with respect to internal and external faults on UHVDC lines are performed. It shows that the high-frequency voltage backward traveling wave at the rectifier side is relatively large in the case of internal faults. However,the backward traveling wave is approximately to be 0 in the case of external faults. Thus,it can be utilized to discriminate internal faults from external ones. The improved voltage gradient method is used to realize the quick and reliable pickup criterion. Numerous simulative results show that the proposed protection scheme can identify the internal and external faults quickly without communication,and can protect the entire line reliably. Besides,it can identify high-impedance faults and is not subject to the distributed capacitor of DC lines.
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Related Author
JING Liuming
DONG Xinzhou
WANG Haigang
YU Bin
XIE Min
CHEN Shi
WANG Bin
LI Xiaopeng
Related Institution
Department of Electrical Engineering,Tsinghua University
State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments,Tsinghua Univeristy
State Grid Anhui Electric Power Company
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State Key Laboratory of Power Transmission Equipment & System Security and New Technology, School of Electrical Engineering,Chongqing University