| Citation:Zhen Liu,Houlei Gao,Sibei Luo,Le Zhao,Yuyao Feng.A fast boundary protection for an ACtransmission line connected to an LCC-HVDC inverter station[J].Protection and Control of Modern Power Systems,2020,V5(4):39-50[Copy] |
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| Abstract: |
| For AC transmission lines connected to an LCC-HVDC inverter station, commutation failure can lead to the wrong
operation of traditional protection. To solve the problem, this paper proposes a fast protection scheme using
transient information from one end of the AC line. The boundary frequency characteristics of the AC line connected
to LCC-HVDC inverter are analyzed first. This reveals the existence of significant attenuation on both high frequency
signals and some specific frequency signals. Based on the boundary characteristics, a novel boundary protection
principle utilizing a backward traveling wave is then proposed. A PSCAD/EMTDC simulation model of a±800 kV
LCC-HVDC and 500 kV AC transmission system is established, and different fault cases are simulated. The simulation
results prove that the novel protection principle is immune to commutation failure, fault resistance and fault type. |
| Key words: LCC-HVDC, Commutation failure, Transient protection, AC transmission line, Inverter station, Boundary
characteristics |
| DOI：10.1186/s41601-020-00175-7 |
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| Fund: |
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