A Novel Protection Method for Grounding Electrode Line of UHVDC Based on Injection Current

In view of the Ultra High Voltage Direct Current (UHVDC) grounding electrode line protection based on injection method, this paper analyses the performance deficiency of the conventional protection scheme due to dead zone, and puts forward a new protection scheme of grounding electrode line. The new...

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Bibliographic Details
Published in2020 IEEE/IAS Industrial and Commercial Power System Asia (I&CPS Asia) pp. 910 - 915
Main Authors Li, Shilong, Li, Xiaopeng, Teng, Yufei, Duan, Xiangxi, Sun, Yongchao, Luo, Rongsen
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.07.2020
Subjects
Circuit faults
current injection
Grounding
grounding electrode line
HVDC
Impedance
Impedance measurement
Industrial power systems
measurement resistance
Radio frequency
transverse differential protection
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Summary:In view of the Ultra High Voltage Direct Current (UHVDC) grounding electrode line protection based on injection method, this paper analyses the performance deficiency of the conventional protection scheme due to dead zone, and puts forward a new protection scheme of grounding electrode line. The new uses the head-end high frequency measured impedance transverse difference ratio to create the protection criterion, which only depends on the unilateral electrical quantity rather than on the communication channel. The proposed scheme greatly shortens the protection dead zone. In this paper, a simulation model was established using PSCAD/EMTDC based on the example of a certain ±800kV UHVDC system to validate the proposed protection scheme. Simulation results showed that the proposed protection of the new protection scheme proposed in this paper could greatly reduce the dead zone protection compared with the conventional protection scheme.
DOI:10.1109/ICPSAsia48933.2020.9208633