摘要
直流馈入将造成交流电网工频变化量方向保护动作特性发生变化。结合交直流互联电网相互作用机理,针对工频变化量方向保护原理的分析特点,建立了适用于工频变化量方向保护动作特性分析的直流系统等值工频变化量阻抗模型,并在不同短路容量及故障条件下,对其特性进行了理论分析。基于PSCAD/EMTDC对各种直流换相失败进行仿真,验证了所建模型的有效性和准确性。该模型为进一步分析直流馈入下的工频变化量方向保护动作特性提供了依据。
The HVDC transmission affects the operation of directional protection based on power-frequency component variation for ac transmission lines. Modeling of HVDC system suitable for analysis of the performance of directional protection based on power-frequency component variation is developed. Considering the interaction of HVDC and AC systems, the equivalent DC- system impedance of power-frequency component variation for commutation failures in HVDC system is formulated. The method is used to analyze the DC-system impedance characteristics under the conditions of different commutation failures caused by different faults. Simulations based on CIGRE benchmark HVDC system testify the effectiveness of the proposed method.
出处
《电力系统自动化》
EI
CSCD
北大核心
2009年第9期41-46,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项目(50337010)~~
关键词
交直流互联电网
工频变化量
方向保护
换相失败
AC/DC interconnected system
power-frequency component variation
directional protection
commutation failure＇
