CHEN Xinquan,LI Haifeng,GU Guangkun,et al.Transient Protection Scheme of HVDC Transmission Line Based on Time-domain Voltage Ratio[J].Automation of Electric Power Systems,2020,44(22):62-69.
CHEN Xinquan,LI Haifeng,GU Guangkun,et al.Transient Protection Scheme of HVDC Transmission Line Based on Time-domain Voltage Ratio[J].Automation of Electric Power Systems,2020,44(22):62-69. DOI: 10.7500/AEPS20191227004.
Transient Protection Scheme of HVDC Transmission Line Based on Time-domain Voltage Ratio
To address the issues about the application of traditional traveling-wave protection on high-voltage direct current (HVDC) transmission lines
such as the insufficient endurance of fault resistance and the dependence of faulty line location around the T zone on the boundary elements
this paper takes the most representative multi-terminal hybrid HVDC system as an example
and mathematically clarifies the traveling wave characteristics of internal faults
external faults and T-zone faults on HVDC transmission lines. Then the time-domain transient voltage ratios with different sampling periods are constructed to reduce the impact of T zone and high fault resistance
thus realizing the internal and external fault identification. Using the time-domain voltage ratio criterion
a transient protection scheme of the HVDC transmission line based on the coordination of single-end protections is proposed to realize the fast fault identification of the HVDC transmission line and the accurate faulty line location on both sides of the T zone. Finally
this paper adopts the electromagnetic transient simulation model based on an actual project to verify the proposed method in detail. The results show that the proposed scheme is feasible with high sensitivity and reliability.
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