摘要
提出一种基于能量守恒原理的纵联差动保护,对线路两端或母线各端的有功功率进行比较,若各端功率的和超出整定值,则判定为区内故障。在典型400 kV输电系统模型上,运用MATLAB仿真软件对所提出的原理进行了仿真验证。仿真结果表明,该方法比传统电流比率差动保护更加可靠且计算量小,因而可缩短动作时间。该方法能检测所有故障类型,适应于超高压远距离输电线路。
This paper presents a unit protection scheme based on the energy conservation law （ECL）. The signals of real power measurement at both ends of a line or all the ends of a busbar are compared and if the result is more than a pre-specified value, an internal or in zone fault is indicated. The proposed technique is evaluated using a MATLAB simulator configured to model the effect of faults on typical 400 kV busbars and transmission lines. Results indicate that the method is more reliable than a conventional biased differential protection algorithm and needs fewer calculations and hence less computation time. It can also detect all fault types, including those on long and/or highly capacitive lines.
出处
《电力系统自动化》
EI
CSCD
北大核心
2007年第3期35-40,共6页
Automation of Electric Power Systems
关键词
线路保护
母线保护
功率差动保护
广域保护
line protection
busbar protection
power differential protection
wide area protection
