广域保护中基于能量守恒原理的母线及输电线差动保护(英文)  

Differential Protection of Busbars and Transmission Lines Based on the Energy Conservation Law for Wide Area Protection

作　　者：Farhad NAMDARI Sadegh JAMALI Peter A CROSSLEY 

机构地区：[1]Centre of Excellence for Power Systems Automation and Operation, Department of Electrical Engineering,Iran University of Science and Technology, Tehran,16846-13114, Iran [2]University of Manchester, Manchester,M60 1QD, UK

出　　处：《电力系统自动化》2007年第3期35-40,共6页Automation of Electric Power Systems

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.

关 键 词：线路保护 母线保护 功率差动保护 广域保护 

分 类 号：TM771[电气工程—电力系统及自动化]