摘要
配电线路快速准确的故障测距对于提高配电网的运行安全非常重要。阻抗法由于其抗干扰性能好并且成本较低,在配电线路中广泛应用.但是配电线路分支众多,会对测距造成较大的误差。针对该问题,在小电阻接地系统多分支电缆线路中将负荷分支进行等效,利用L-M算法求解出分支等效阻抗以及负荷阻抗,使得系统可观。线路发生单相接地故障后,分别在主干线和分支线上进行定位,并求出故障距离。在PSCAD中建立仿真模型,仿真结果验证了算法的准确性。
Fast and accurate fault location of distribution line is very important to improve the operation safety of distribution network.Impedance method is widely used in distribution lines because of its good anti-interference performance and low cost.However,there are many branches in distribution lines,which will cause large errors in ranging.To solve this problem,the load branch in multi branch cable line of small resistance grounding system is equvalented,and L-M algorithm is used to solve the branch equivalent impedance and load impedance,which makes the system observable.After the single-phase ground fault occurs,the fault location is carried out on the main line and branch line respectively,and the fault distance is calculated.The simulation model is established in PSCAD,and the simulation results verify the accuracy of the algorithm.
作者
曲振明
王宾
张慧芬
QU Zhenming;WANG Bin;ZHANG Huifen(School of Automation and Electrical Engineering,Jinan University,Jinan 250022,China;State Key Lab of Control and Simulation of Power Systems and Generation Equipments,Department of Electrical Engineering,Tsinghua University,Beijing 100084,China)
出处
《电气应用》
2021年第5期28-33,38,共7页
Electrotechnical Application
关键词
故障测距
多分支
单相接地故障
电缆线路
小电阻接地系统
fault location
multi branch
single phase grounding fault
cable line
small resistance grounding system
