引用本文: | 谢李为,李 勇,罗隆福,等.基于节点电压差值的配电网故障定位方法[J].电力系统保护与控制,2023,51(6):106-116.[点击复制] |
XIE Liwei,LI Yong,LUO Longfu,et al.A novel fault location method employing node voltage difference value for a distribution network[J].Power System Protection and Control,2023,51(6):106-116[点击复制] |
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摘要: |
针对基于微型同步相量量测(μPMU)的配电网故障定位方法存在经济性与定位精度有待提高的问题,提出了一种基于节点电压差值的配电网故障定位方法。通过分析配电网节点电压的故障特性,定义了节点电压计算值与量测值的差值指标W。然后,利用节点电压计算值与量测值之间的数值关系,建立了有限量测装置情形下的配电网故障支路辨识原则。进而,根据故障支路两端节点的量测数据,利用末端节点注入电流后线路间节点电压变化值与末端节点量测电压变化值间的关系,提出一种基于线路末端节点电压差值的故障定位方法。仿真表明,所提方法可以实现有限量测装置情形下的故障准确定位,且定位结果受故障类型、过渡电阻、量测误差的影响较小,具有较好的抗线路参数和节点负荷变化的能力。 |
关键词: 故障定位 配电网 节点电压差值 μPMU |
DOI:10.19783/j.cnki.pspc.220883 |
投稿时间:2022-03-31修订日期:2022-08-25 |
基金项目:国家自然科学基金项目资助(52061130217);深圳市承接国家重大科技项目资助(CJGJZD202006171024 05015);湖南省水利科技项目资助(XSKJ2021000-48) |
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A novel fault location method employing node voltage difference value for a distribution network |
XIE Liwei1,LI Yong1,LUO Longfu1,ZENG Xiangjun2,YU Kun2,HOU Liang3,CAO Yijia1 |
(1. School of Electrical and Information Engineering, Hunan University, Changsha 410082, China; 2. School of Electrical
and Information Engineering, Changsha University of Science and Technology, Changsha 410114, China;
3. CYG SUNRI Co., Ltd., Shenzhen 518057, China) |
Abstract: |
To solve the economic shortcomings of and improve the location accuracy of fault location methods employing micro-phasor measurement unit (μPMU), a novel fault location method based on node voltage difference value is proposed. By analyzing the fault characteristics of node voltages for the distribution network, an indicator W is defined as the difference value between the calculated values and measured values of node voltage. Then, according to the numerical relationship between the calculated voltage values and the measured voltage values, a fault branch identification principle is established with limited measurement devices for the distribution network. From the measurement data at the terminals of fault branches and the numerical relationship between the change value of line node voltage and the change value of node measured voltage, a fault location method is proposed based on node voltage difference value. Simulation results show that the proposed method can locate fault points effectively. It has low sensitivity to fault types, grounding resistances and measurement errors, and good robustness to the changes of line parameters and node load. |
Key words: fault location distribution network node voltage difference value μPMU |