Analysis of a resonance accident from the no-load closing of AC cable in an offshore wind farm and corresponding countermeasures
| Autor: | LIU Shidan, LI Yiquan, YU Weiguo, LIU Hongjun, LIN Sajia, GAO Xiaoquan, LING Hao |
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| Jazyk: | čínština |
| Rok vydání: | 2024 |
| Předmět: | |
| Zdroj: | Zhejiang dianli, Vol 43, Iss 11, Pp 65-73 (2024) |
| Druh dokumentu: | article |
| ISSN: | 1007-1881 20241100 |
| DOI: | 10.19585/j.zjdl.202411008 |
| Popis: | Under the same conditions， the ground capacitance of high-voltage AC submarine cables is over 20 times greater than that of overhead lines， making resonance phenomena more likely during no-load closing of submarine cables. This paper addresses an incident during the no-load closing of a 500 kV AC submarine cable in an offshore wind farm， where resonance caused a malfunction of the line differential protection. The paper analyzes the fault recording data and investigates the resonance mechanism during the closing process based on circuit theory. Simulation results indicate that the incident was caused by the integration of long-distance high-voltage AC cables into a weak system， leading to resonance overcurrents that were below 1.5 times the power frequency but of high magnitude. Despite current compensation from the protection device， significant capacitive resonant differential currents remained， resulting in the malfunction of the differential protection. In light of the engineering context， the paper proposes a response strategy that optimizes the wiring of the secondary circuit of the protection device and dynamically adjusts the threshold for differential current action based on system conditions and the magnitude of line capacitive currents. Finally， the effectiveness of the proposed countermeasures is validated through RTDS closed-loop testing. |
| Databáze: | Directory of Open Access Journals |
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