A high-speed protection scheme for the DC transmission line of a MMC-HVDC grid

•The feature of fault-induced travelling waves after DC transmission line fault is analyzed and is quantitatively described.•Based on the analysis, a single-ended initial travelling wave based protection scheme is proposed.•The fast identification method for lightning disturbance is proposed to ensu...

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Bibliographic Details
Published in:Electric power systems research 2019-03, Vol.168, p.81-91
Main Authors: Tang, Lanxi, Dong, Xinzhou, Shi, Shenxing, Qiu, Yufeng
Format: Article
Language:English
Subjects:
Circuit breakers
Controllers
Converters
Direct current
Electric potential
Electric power transmission
Electricity distribution
Electricity generation
Fault tolerance
High voltages
HVDC grid
Lightning disturbance
MMC-HVDC
Prototypes
Surge protectors
Transmission line protection
Transmission lines
Traveling waves
Travelling wave
VSC-HVDC
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Summary:•The feature of fault-induced travelling waves after DC transmission line fault is analyzed and is quantitatively described.•Based on the analysis, a single-ended initial travelling wave based protection scheme is proposed.•The fast identification method for lightning disturbance is proposed to ensure the reliability.•Protection device is designed and a prototype device is implemented.•The operation time is approximately 1.2ms, which satisfies the requirement for no more than 2ms and has a large margin. High Voltage Direct Current (HVDC) grids based on Voltage-Source Converters (VSC) are flexible and can absorb large amounts of renewable energy. However, since the magnitude of fault current increases quickly, and it cannot be controlled after DC transmission line fault, the DC transmission line protection should operate very fast after the fault event. Otherwise, the DC circuit breakers will not be able to interrupt such a large fault current, which may cause permanent damage to the devices in the converter station. Based on the analysis of the feature of fault-induced travelling waves after DC transmission line fault, this paper proposes single-ended initial travelling wave based protection scheme. Based on the analysis of the feature of lightning disturbance, this paper also proposes fast identification scheme for lighting disturbance, in order to increase the reliability of the protection and maintain the high operation speed at the same time. A protection device prototype has been designed and implemented. Abundant tests have been conducted to verify the performance of the prototype device. The operation time of the protection is less than 1.2ms.
ISSN:0378-7796
1873-2046
DOI:10.1016/j.epsr.2018.11.008