交-直流碰线故障对交流线路距离保护的影响  

Affect on Distance Protection of AC Line by AC-DC Line Touching Fault

作　　者：杜婉琳 唐旭 黄泽杰 DU Wanlin;TANG Xu;HUANG Zejie(Electric Power Research Institute of Guangdong Power Grid Co.,Ltd.,Guangzhou,Guangdong 510080,China;School of Electric Power,South China University of Technology,Guangzhou,Guangdong 510640)

机构地区：[1]广东电网有限责任公司电力科学研究院,广东广州510080 [2]华南理工大学电力学院,广东广州510640

出　　处：《广东电力》2019年第4期48-54,共7页Guangdong Electric Power

基　　金：国家自然科学基金项目(51307065)

摘　　要：交直流互联系统中,交流和直流线路交叉跨越情况下容易发生交-直流碰线故障,对交流线路距离保护产生影响。为此,首先分析不同系统状态和故障情况下的换流阀导通状态并找出交流短路通道,计及直流控制保护快速动作及单极闭锁情况,对交-直流碰线短路故障特性进行研究。然后以故障特性研究为基础,从理论上分析距离保护在交-直流碰线故障下的适应性。最后,应用PSCAD/EMTDC软件搭建仿真模型,验证了理论分析的正确性。In the AC/DC interconnected system,crossing of AC lines and DC lines is liable to cause AC-DC line touching fault,which will affect distance protection of AC lines.Therefore,this paper firstly analyzes conducting states of the inverter value under different system states and fault conditions,and finds out AC short-circuit channel.Considering rapid action of DC control protection and monopole blocking,it studies characteristics of AC-DC line touching fault.Then based on fault characteristic research,it analyzes adaptability of distance protection in AC-DC line touching fault in theory.Finally,by using PSCAD/EMTDC,it establishes a simulation model and verifies correctness of theoretical analysis.

关 键 词：交直流互联系统 交-直流碰线故障 故障特性分析 距离保护 保护动作特性 

分 类 号：TM77[电气工程—电力系统及自动化]