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兼具抗同步误差和耐高阻能力的直流配电网单极接地故障测距方法
吴宇奇1, 叶雨晴1,2, 马啸1, 李正天1, 吴通华3, 徐海波4
1.华中科技大学 强电磁工程与新技术国家重点实验室,湖北 武汉 430074;2.国网浙江省电力有限公司 杭州供电公司,浙江 杭州 310016;3.南瑞集团(国网电力科学研究院)有限公司 智能电网保护和运行控制国家重点实验室,江苏 南京 211106;4.易事特集团股份有限公司,广东 东莞 523808
摘要:
针对已有双端故障测距方法的缺陷,基于RL线路时域微分方程建立双端故障测距模型,利用移动数据窗和最小距离方差计算实现双端数据自同步,降低对时误差带来的不利影响;同时构建不稳定点剔除判据,规避小量相除的运算场景。在此基础上,针对高阻接地故障,利用电压源换流器短时的零模式运行向系统注入小幅扰动,配合均值滤波算法和扩大的数据窗长提高所提方法的耐过渡电阻能力。三端环形直流配电网仿真结果表明,所提方法在考虑同步误差和过渡电阻为300 Ω的接地故障的场景下仍具有理想的故障测距效果,性能较现有RL双端故障测距方法有了明显提升。所提方法对采样频率需求较低,在配电网中具有良好的应用前景。
关键词:  直流配电网  单极接地故障  故障测距  信号同步  信号注入
DOI:10.16081/j.epae.202202007
分类号:TM72
基金项目:智能电网保护和运行控制国家重点实验室资助项目;东莞市引进创新科研团队计划资助(201536000200036)
Single pole-to-ground fault locating method with ability against synchronization error and high fault resistance for DC distribution network
WU Yuqi1, YE Yuqing1,2, MA Xiao1, LI Zhengtian1, WU Tonghua3, XU Haibo4
1.China State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, China;2.Hangzhou Power Supply Company, State Grid Zhejiang Electric Power Co.,Ltd.,Hangzhou 310016, China;3.State Key Laboratory of Smart Grid Protection and Control, NARI Group Corporation(State Grid Electric Power Research Institute),Nanjing 211106, China;4.Guangdong EAST Power Co.,Ltd.,Dongguan 523808, China
Abstract:
Aiming at the defects of the existing two-terminal fault locating methods, the two-terminal fault locating model is established based on the RL power line time-domain differential equations, and the moving data window and the minimum distance variance calculation are utilized to achieve self-synchronization of the two-terminal data to reduce the adverse impacts of synchronization error. Meanwhile, the criterion for removing unstable points is constructed to avoid division operations of small numbers. On this basis, aiming at the grounding fault with high resistance, the short-time zero mode operation of the VSC(Voltage Source Converter) is adopted to inject a small disturbance into the system, cooperating with the mean filtering algorithm and enlarged data window, the ability against transient resistance of the proposed method is enhanced. Simulative results of a three-terminal circular DC distribution network show that the proposed method still has ideal fault locating effect under the situation of synchronization error and grounding fault with 300 Ω transient resistance, and the performance of the proposed method is obviously better than that of the existing RL two-terminal fault locating methods. The proposed method has a low requirement for sampling frequency and a good application prospect in distribution network.
Key words:  DC distribution network  single pole-to-ground fault  fault locating  signal synchronization  signal injection

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