摘要
基于各种换相失败情况下的直流系统等值工频变化量阻抗特性,对非故障线路的工频变化量方向元件动作特性进行了理论研究,分析了直流换相失败暂态过程造成非故障线路方向元件所感受到的暂态功率方向突变的问题;在此基础上结合方向纵联保护不同的动作逻辑,对直流换相失败暂态过程引起非故障线路方向纵联保护误动情况进行了分析;基于PSCAD/EMTDC的仿真验证了理论分析的正确性。
Based on the characteristics of DC-systern impedance of power-frequency component variation under different conditions of commutation failures in HVDC system, the influence of the transient power converse caused by commutation failure on the operation of directional relays for the different unfaulted transmission lines is analyzed. The transient power converse may result in the wrong tripping of directional pilot protection of the unfaulted transmission lines. The response of directional pilot protection under different conditions of commutation failures are evaluated on the basis of the protection tripping logic. Simulations based on GIGRE benchmark HVDC system prove the correctness of the conclusion.
出处
《电力系统自动化》
EI
CSCD
北大核心
2009年第11期43-48,共6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
暂态功率方向变化
AC/DC interconnected system
power-frequency component variation
directional relay
commutation failure
transient power converse
