摘要
直流融冰技术是解决超高压输电线路覆冰问题的有效方法。由于融冰过程中冰水的掉落易导致输电线路的单相接地故障,研究了融冰线路的故障定位方法,以保障融冰过程的顺利进行及融冰设备的安全运行。首先对直流融冰系统的组成及整流器拓扑结构、控制策略进行了介绍并搭建了融冰系统的详细仿真模型。针对定电流控制方式下直流融冰线路的单相接地故障,通过对沿线电压分布的深入分析,提出了基于贝瑞隆模型的直流融冰线路接地故障定位方法。利用PSCAD/EMTDC仿真软件对融冰线路故障进行了仿真验证,结果表明该方法能够实现融冰线路接地故障的快速准确定位。
DC de-icing technology is an effective measure to solve the ice-cladding problems of extra-high voltage transmission lines.During DC de-icing process,the single-phase ground fault of transmission lines is easily caused by falling ice water.The fault location method is studied to ensure safe and reliable operation of the transmission lines and system.The DC de-icing system and the topological structure and control strategy of converter are described first,and a detailed simulation model of the DC de-icing system is built.Based on Bergeron model,the voltage profile along the line is analyzed at length and a novel fault location method is proposed to locate the single-phase ground fault of de-icing transmission lines under fixed-current control.PSCAD/EMTDC simulation software is used to simulate and test all kinds of single-phase ground faults.Simulation results show that the fault of de-icing transmission lines can be located quickly and accurately in time domain with the proposed method.
出处
《电力系统自动化》
EI
CSCD
北大核心
2017年第20期105-111,共7页
Automation of Electric Power Systems
基金
国家自然科学基金资助项目(51677125)
高等学校博士学科点专项科研基金新教师类资助项目(20120032120085)~~
关键词
直流融冰装置
融冰线路
故障定位
贝瑞隆模型
定电流控制
DC de-icer
de-icing transmission line
fault location
Bergeron model
fixed-current control
