摘要
间歇性电弧接地过电压是小电流接地故障最大的危害之一,建立准确的电弧模型是研究过电压特征的基础。基于现有的几种动态电弧模型,提出改进的"控制论"电弧模型,并将该模型应用于小电流接地系统。通过在PSCAD平台上搭建10 kV配电网模型,研究基于工频熄弧和高频熄弧理论仿真间歇性电弧接地故障,并对比分析接地过电压的异同。仿真结果表明,所提电弧模型能够有效反映小电流接地故障的电弧特性,模拟出的过电压符合实际情况。证实在不接地系统中,高频熄弧产生的最大过电压明显高于工频熄弧;而在消弧线圈接地系统中,二者近似相等。
Intermittent arc grounding overvoltage fault is one of the greatest threats in non-solidly earthed networks. Establishing an accurate arc model is the fundermental of analyzing overvoltage characteristics. Based on the analysis of existing arc models, an improved “cybernetic arc model” is proposed for the non-solidly earthed network and a model of 10 kV distribution network is built on the PSCAD. According to the arc extinction theories of power frequency and high frequency, intermittent arc grounding faults are simulated. Besides, differences and similarities of grounding overvoltage are also compared. The simulation results indicated that arc characteristics of non-solidly earthed network are effectively presented by the proposed model and the simulated overvoltage is close to the actual voltage. For the isolated neutral system, the maximum overvoltage generated by the high frequency extinction is higher than that of power frequency extinction. Comparably, both of them are approximately equal in the Petersen coil grounded system.
作者
李淑蓉
薛永端
徐丙垠
任伟
杨帆
LI Shu-rong;XUE Yong-duan;XU Bing-yin;REN Wei;YANG Fan(College of Information and Control Engineering, China University of Petroleum (East China), Qingdao 266580, China;Smart Grid Research Center, Shandong University of Technology, Zibo 255049, China;Electric Power Research Institute of State Grid Hubei Electric Power Company, Wuhan 430077, China)
出处
《电力科学与技术学报》
CAS
北大核心
2019年第1期47-53,共7页
Journal of Electric Power Science And Technology
基金
国家自然科学基金(51477184)
国网湖北省电力公司科技项目(52153216001P)
关键词
小电流接地系统
熄弧理论
过电压特征
电弧模型
PSCAD仿真
non-solidly earthed network
arc extinction theory
overvoltage characteristic
arc model
PSCAD simulation
作者简介
通信作者:薛永端(1970-),男,博士,教授,主要从事配电网接地方式与接地故障自愈技术、配网自动化技术的研究;E-mail:xueyd70@126.com.
