A Novel Protection Scheme of AC and DC Line-Touching Based on Coordination of AC and DC Protection

doi:10.11930/j.issn.1004-9649.202206128

Abstract

Abstract: The AC/DC hybrid grid is developing rapidly, and the AC-DC line-touching fault has become an unique fault type. By taking different types of AC and DC line touching faults as the research object, and focusing on the whole process from fault isolation to line reclosing/restarting, the paper explores the deficiencies and risks of existing AC and DC systems in relevant protection outlet action logic, and proposes a new idea for designing and adding a AC-DC line-touching protection scheme on the AC side. By constructing a protection algorithm that can reflect the phase angle characteristics of the DC system equivalent impedance, the AC-DC line touching fault identification is realized. Through optimizing the action sequence and logical coordination relationship between the newly added AC-DC line-touching protection on the AC side and the AC-DC line-touching protection placed on the DC side, the adaptive restart of the DC system is realized under the AC-DC line-touching fault, which avoids the risk of power frequency overvoltage at the head and end terminals of the DC line under the scenario of AC side permanent fault. A simulation model of AC-DC line-touching fault is built in the PSCAD/EMTDC platform, and a large number of simulation experiments are carried out. The simulation results verify the feasibility of the proposed new AC-DC line-touching protection scheme.

Key words: AC/DC hybrid power grid, AC-DC line-touching protection, protection risk analysis, fault recognition algorithm, new protection scheme

TANG Wei, YU Su, ZHENG Tao, YU Huanchang, NI Yuxiang, MENG Lingkun. A Novel Protection Scheme of AC and DC Line-Touching Based on Coordination of AC and DC Protection[J]. Electric Power, 2022, 55(11): 41-50.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202206128

https://www.electricpower.com.cn/EN/Y2022/V55/I11/41

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