DAI Wenrui,ZHANG Haiqiang,MOU Dalin,et al.Single-end protection scheme for HVDC transmission line based onfault current propagation characteristics[J].Electric Power Automation Equipment,2019,39(09):67-73.
DAI Wenrui,ZHANG Haiqiang,MOU Dalin,et al.Single-end protection scheme for HVDC transmission line based onfault current propagation characteristics[J].Electric Power Automation Equipment,2019,39(09):67-73.DOI: 10.16081/j.epae.201909016.
Single-end protection scheme for HVDC transmission line based onfault current propagation characteristics
Aiming at the problems of low fault identification accuracy and poor transition resistance tole-rance of existing traveling wave protections for HVDC(High Voltage Direct Current) transmission lines,a single-end protection scheme based on fault current propagation characteristics is proposed. Based on the equivalent circuit of HVDC transmission system,the propagation characteristics of fault current from the commutation side to the line,from the line to the commutation side and in the line are analyzed respec-tively,and then the differences of fault current characteristics on both sides of the line boundary of the recti-fier station are analyzed when fault occurs at different locations. Based on this,the identification criterion of internal and external faults is constructed by using characteristic frequency band current,and the single-end protection scheme of DC line is designed. Simulative results based on PSCAD/EMTDC indicate that the proposed protection scheme can accurately identify internal and external faults,and has good resistance to transition resistance and anti-noise-interference ability.
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