Improved traveling wave protection method for MMCsingle bondHVDC systems based on the tracking differentiator to resist uncertain interference

The main and backup protection principles in the flexible high-voltage direct-current (HVDC) transmission lines are traveling wave (TW) and differential voltage, respectively. However, these protections may suffer from misoperation problems due to the uncertain interference from the differential qua...

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Bibliographic Details
Published in:Electric power systems research 2022-07, Vol.208, p.1
Main Authors: Yu, DC, Zhou, NC, Liao, JQ, Wang, QG
Format: Article
Language:English
Subjects:
Differentiators
Electric currents
Electric power lines
Electric power transmission
Electricity distribution
Fault diagnosis
Interference
Sampling
Tracking
Tracking control systems
Transmission lines
Traveling waves
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Summary:The main and backup protection principles in the flexible high-voltage direct-current (HVDC) transmission lines are traveling wave (TW) and differential voltage, respectively. However, these protections may suffer from misoperation problems due to the uncertain interference from the differential quantities of fault signals. This study analyses the characteristics of high-frequency components of TW under different sampling rates and noise ratios. An improved TW protection method based on the tracking differentiator is then proposed to enhance the anti-interference ability of TW protection. The proposed method is validated using a four-terminal HVDC grid. Simulation results show that the method can enhance the reliable trip of protection against HVDC line faults under high sampling frequency.
ISSN:0378-7796
1873-2046
DOI:10.1016/j.epsr.2022.107888