逆变型分布式电源接入影响配电网电弧接地过电压的仿真研究  

Simulation Analysis of Influence of Inverter Interfaced Distributed Generator Access on Arc Grounding Overvoltage of Distribution Network

作　　者：任伟 李淑蓉 薛永端[1] REN Wei;LI Shurong;XUE Yongduan(College of Information and Control Engineering of China Petroleum University(East China),Qingdao 266580,China)

机构地区：[1]中国石油大学(华东)信息与控制工程学院,山东青岛266580

出　　处：《供用电》2019年第2期13-19,28,共8页Distribution & Utilization

基　　金：国家自然科学基金项目(51477184)~~

摘　　要：随着光伏发电以及并网技术的发展,投入配电网的逆变型分布式电源(inverter interfaced distributed generator,IIDG)数量与日俱增,而间歇性电弧接地作为配电网最常见的故障之一,其产生的过电压将严重影响配电网、电力电子器件绝缘,破坏电力系统正常运行,故有必要准确建模并分析IIDG接入对配电网电弧接地过电压的影响。采用仿真计算的方法,在Matlab/Simulink平台构建10 kV小电流接地配电网仿真模型,基于工频熄弧理论,分别分析IIDG接入容量、数量、接入位置以及故障发生位置对主网电弧接地过电压的影响,并对比了IIDG与同容量负荷对主网弧光接地过电压影响的差异。仿真结果表明,IIDG接入点越靠近出线末端,其下游发生故障时的过电压值越大;而负荷接入点越靠近出线末端,其下游发生故障时的过电压值越小。With the development of photovoltaics power generation and grid connected technology,lots of inverter interfaced distributed generators(IIDG)are connected to power system.Nowadays,intermittent arc grounding fault is one of the most common faults in distribution networks.The generated overvoltage will seriously affect the insulation of distribution networks and power electronic devices,which damage the normal operation of power system.Therefore,it is particularly important to accurately model and analyze the influence of IIDG on arc grounding overvoltage.In this paper,the simulation model of 10 kV distribution network is built via Matlab/Simulink platform.According to the arc extinction theories based on power frequency,different influences of IIDG access capacity,quantity,access point and fault location on arc grounding overvoltage are analyzed.Besides,the difference between the effect of IIDG and the same capacity load on the arcing grounding overvoltage of the main network are compared.The simulation results indicate that if the fault occurs in downstream of the IIDG access point,the closer the IIDG access point is to the end of the outgoing line,the greater the overvoltage value.The load has the opposite effect that the closer the load access point is to the end of the outgoing line,the smaller the overvoltage value.

关 键 词：逆变型分布式电源 小电流接地系统 间歇性电弧接地过电压 Matlab仿真 配电网 

分 类 号：TM74[电气工程—电力系统及自动化]