A novel acceleration criterion for remote-end grounding-fault in MMC-MTDC under communication anomalies
A novel acceleration criterion for remote-end grounding-fault in MMC-MTDC under communication anomalies
复制标题
通信异常下MMC-MTDC远端接地故障的新型加速判据
DOI：
10.1016/j.ijepes.2022.108131
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Loi Lei Lai
中科院分区：
文献类型：
--
作者：
Ning Tong;Zhenjie Tang;Chun Sing Lai;Xue Li;Alfredo Vaccaro;Loi Lei Lai
基于模块化多电平换流器的多端高压直流输电系统(MMC-MTDC)在远距离、灵活输电方面具有很高的技术优势。近年来，其快速初级保护的发展有了很大的进步，特别是对于不受通信异常影响的就地测量型初级保护。然而，在许多情况下，基于局部测量的保护元件的远端故障识别问题需要进一步研究，主要是因为此类保护元件要在灵敏度和安全性之间取得平衡。提出了一种新的加速判据来识别MMC-MTDC的远端故障。根据内部故障和外部故障情况下行波传播特性的不同，局端保护元件会检测到远端直流断路器合闸时产生的高振荡信号。相反，在外部故障情况下不会观察到这样的信号。利用小波时间熵对振动特征进行量化。基于在PSCAD/EMTDC平台上建立的四端MMC-MTDC，对所提出的准则的性能进行了评估。结果表明，采用该判据后，基于局部测量的保护元件对远端故障的灵敏度大大提高。
The multi-terminal HVDC system based on the modular multilevel converter (MMC-MTDC) has very high technical merits for long-distance, flexible power transmission. In recent years, there has been a significant improvement in developing its fast-speed primary protection, especially for local-measurement-based ones immune to communication anomalies. However, in many cases, the problem of remote-end fault identification for the local-measurement-based protection elements needs further studies, mainly because such protection elements should balance between sensitivity and security. This paper proposes a novel acceleration criterion to identify remote-end faults for the MMC-MTDC. Based on the difference of the traveling wave propagation characteristics between the scenario of internal faults and that of the external fault, the local-end protection element will detect a highly-oscillating signal due to the opening of the remote-end DC circuit breaker. In contrast, no such signal will be observed in the external fault scenario. The wavelet time entropy is utilized to quantify the feature of oscillation. The performance of the proposed criterion is assessed based on the established four-terminal MMC-MTDC on the PSCAD/EMTDC platform. Results indicate that by using the proposed criterion, the sensitivity of the local-measurement-based protection element against remote-end faults is greatly enhanced.
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影响因子：
4.4
作者：
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DOI：
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影响因子：
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作者：
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作者：
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DOI：
10.1016/j.ijepes.2019.105478
发表时间：
2020-02
影响因子：
5.2
作者：
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通讯作者：
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