Advances in renewable energy recourses technologies have paved the way for increased utilization of DC grids in modern power systems. In particular, high voltage DC (HVDC) transmission cables are used to harvest offshore energy. Since failure diagnosis and repair of the buried offshore cables under the sea bed involve quite laborious tasks, accurate fault location is of vital importance. This paper proposes a novel fault location method based on the synchronized measurement of conductors and sheaths currents in each terminal without requiring the voltage signal. Unlike the traveling-wave-based methods, the proposed method is developed for multi-terminal HVDC systems without requiring any high precision measurement infrastructure. The proposed method can be implemented for different system topologies as well as fault resistance and fault distance. The fault location method can provide accurate results even if 10 ms time window samples are imported into the proposed algorithm. In addition, accuracy of the fault location using the proposed method is not affected significantly by noisy condition. Different test systems have been simulated to evaluate performance of the proposed method in various scenarios. Obtained results confirm that the proposed practical method can provide the accurate fault location for all different scenarios and conditions.

中文翻译：

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一种用于海上可再生能源采集的新型直流输电系统故障定位技术

可再生能源资源技术的进步为提高现代电力系统中直流电网的利用率铺平了道路。特别是，高压直流 (HVDC) 传输电缆用于收集海上能源。由于海底埋地海上电缆的故障诊断和修复涉及相当繁重的任务，因此准确定位故障至关重要。本文提出了一种新的故障定位方法，该方法基于同步测量每个端子中的导体和护套电流，而不需要电压信号。与基于行波的方法不同，所提出的方法是为多终端 HVDC 系统开发的，不需要任何高精度测量基础设施。所提出的方法可以针对不同的系统拓扑以及故障电阻和故障距离实施。即使将 10 ms 时间窗口样本导入到所提出的算法中，故障定位方法也能提供准确的结果。此外，使用所提出的方法进行故障定位的准确性不受噪声条件的显着影响。已经模拟了不同的测试系统以评估所提出的方法在各种场景中的性能。获得的结果证实，所提出的实用方法可以为所有不同的场景和条件提供准确的故障定位。已经模拟了不同的测试系统以评估所提出的方法在各种场景中的性能。获得的结果证实，所提出的实用方法可以为所有不同的场景和条件提供准确的故障定位。已经模拟了不同的测试系统以评估所提出的方法在各种场景中的性能。获得的结果证实，所提出的实用方法可以为所有不同的场景和条件提供准确的故障定位。