A fast boundary protection for an AC transmission line connected to an LCCHVDC inverter station  

作　　者：Zhen Liu Houlei Gao Sibei Luo Le Zhao Yuyao Feng 

机构地区：[1]Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education,Shandong University,No.17923,Jingshi Road,Jinan 250061,China [2]Electric Power Research Institute of State Grid Shanghai Electric Power Company,No.171,Handan Road,Shanghai,China

出　　处：《Protection and Control of Modern Power Systems》2020年第1期328-339,共12页现代电力系统保护与控制（英文）

基　　金：supported by the National Key R&D Program of China(2016YFB0900603);the Technology Projects of State Grid Corporation of China(52094017000 W).

摘　　要：For AC transmission lines connected to an LCC-HVDC inverter station,commutation failure can lead to the wrong operation of traditional protection.To solve the problem,this paper proposes a fast protection scheme using transient information from one end of the AC line.The boundary frequency characteristics of the AC line connected to LCC-HVDC inverter are analyzed first.This reveals the existence of significant attenuation on both high frequency signals and some specific frequency signals.Based on the boundary characteristics,a novel boundary protection principle utilizing a backward traveling wave is then proposed.A PSCAD/EMTDC simulation model of a±800 kV LCC-HVDC and 500 kV AC transmission system is established,and different fault cases are simulated.The simulation results prove that the novel protection principle is immune to commutation failure,fault resistance and fault type.

关 键 词：LCC-HVDC Commutation failure Transient protection AC transmission line Inverter station Boundary characteristics 

分 类 号：O17[理学—数学]