摘要
基于不同换相失败情况下的直流系统等值工频变化量阻抗特性,结合工频变化量方向保护原理,分析了不同输电线路故障时,直流换相失败对故障线路工频变化量方向元件产生影响的机理,并对各种情况下导致故障线路工频变化量方向纵联保护拒动的条件进行了深入分析。基于PSCAD/EMTDC的仿真验证了理论分析的正确性。
Based on impedance characteristics of equivalent power-frequency component variation under different situation of commutation failures in HVDC system, combined with directional protection principle for power-frequency component variation, the influence mechanism of communication failure on the operation of directional relays for the different faulted transmission lines is analyzed. In addition, conditions of refusal to act of directional protection of faulted line under various situations are also deeply analyzed. The correctness of fore-mentioned analysis is confirmed with PSCAD/EMTDC simulation.
出处
《电力系统自动化》
EI
CSCD
北大核心
2009年第10期47-53,共7页
Automation of Electric Power Systems
基金
“十一五”国家科技支撑计划重大项目(2006BAA02A30)
国家自然科学基金重点资助项目(50337010)~~
关键词
交直流互联电网
工频变化量
方向元件
换相失败
AC/DC interconnected system
power-frequency component variation
directional relay
commutation failure
