摘要
目前电磁时间反演(electromagnetic time reversal,EMTR)多应用在单一线路故障定位,且现有判据在高阻抗接地情况下效果不理想。针对上述问题,基于EMTR故障定位原理和均匀传输线理论推导了传播过程中线路故障信号与测量信号的传递函数,根据传递函数的相关性提出了P范数判据。利用ATP-EMTP搭建10 kV配电网线路,对比了2范数与P范数判据在复杂配电网中的定位性能,并验证了所提判据在混合配电网线路的适用性。最后,分析了配电网发生低阻抗及高阻抗接地故障下P范数判据的鲁棒性。仿真结果表明,该方法在过渡电阻高达3 kΩ的情况下能准确定位,且定位精度高,受噪声、故障类型和采样频率的影响小。
Electromagnetic time reversal(EMTR)is mostly applied to single line fault localization,and the existing criterion is not satisfactory in the case of high impedance grounding.To address the above problem,this paper derives the transfer function of the line fault and measurement signals in the propagation process based on the EMTR fault localization principle and uniform transmission line theory.It proposes a P-parametric criterion based on the correlation of the transfer function.The ATP-EMTP is used to build 10 kV distribution lines to compare the localization performance of the 2-parametric and P-parametric criterion in complex distribution networks,and to verify the applicability of the proposed criterion in hybrid distribution lines.Finally,the robustness of the P-parametric criterion is analyzed in the cases of occurrence of low and high impedance ground faults in distribution networks.Simulation results show that the method can locate accurately with transition resistances as high as 3 kWwith high accuracy,and is less affected by noise,fault type and sampling frequency.
作者
刘青
黄玉河
王宇
付瑶
王乐之
LIU Qing;HUANG Yuhe;WANG Yu;FU Yao;WANG Lezhi(School of Electrical and Control Engineering,Xi’an University of Science and Technology,Xi’an 710054,China)
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2024年第3期74-82,共9页
Power System Protection and Control
基金
国家自然科学基金项目资助(52077167)
梯级水电站运行与控制湖北省重点实验室开放基金项目资助(2021KJX03)。
关键词
电磁时间反演
传递函数
P范数
配电网
故障定位
高阻抗接地
EMTR
transfer function
P-parametric
distribution network
fault location
high impedance grounding
