基于各纵联阻抗原理的输电线纵联保护综述  

Transmission line pilot protection summary based on principle of each pilot impedance

作　　者：夏经德[1] 索南加乐[1] 刘凯[1] 张怿宁[1] 

机构地区：[1]西安交通大学电气工程学院,陕西西安710049

出　　处：《浙江大学学报（工学版）》2011年第10期1827-1835,共9页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(50877061;51037005);高等学校博士学科点专项科研基金资助项目(20070698057)

摘　　要：针对已发表基于线路两端电气量所得阻抗的输电线路纵联保护原理及所含共性,这些阻抗被定义为纵联阻抗,根据各纵联阻抗计算形式和数值结果分别定名为商和、和商、差商和增强的差商纵联阻抗.对于纵联阻抗确定统一的物理电路模型,在单相、三相等效线路模型的基础上完善了各纵联阻抗合理的物理定义和准确的数学表达,并在准确数理推导的基础上强化了相间解耦算法和电容补偿方法,从而可以确定各纵联阻抗的状态特点,提高部分纵联阻抗的性能指标.在电磁暂态程序(EMTP)中建立1 000kV 500km线路模型,使用兰州东至咸阳由中国电力科学研究院构建的750kV线路动模,在这些模型中的仿真结果验证了所述研究工作的正确性.The impedances were defined as the pilot impedances aiming at the generality that is extracted from the pilot protection principles of the transmission lines based on the impedances obtained by the line two-terminals electrical quantities on the published papers. The impedances are respectively named as the pilot impedances of Quotient Summation, Summation Quotient, Difference Quotient and Enhanced Difference Quotient according to their calculating forms and numerical results of each pilot impedance. The unified physical circuit model was determined for the pilot impedances. The physical circuit model not only improved the reasonable physical definition and the exact mathematic expression based on the single-phase and three-phase equivalent line models, but also strengthened the inter-phase decoupling algorithms and the capacitance compensating methods based on the accurate mathematical-physical deduction. The state characteristics of whole pilot impedances were cleared and the performance index of part pilot impedances was improved. A 1 000 kV 500 km simulating line model was established on electro-magnetic transient program （EMTP）, and a 750 kV laboratory line model from Lan Zhou Dong to Xian Yang constructed by China Electric Power Research Institute was used. Simulation results showed the validity of the above research work.

关 键 词：输电线路 纵联保护 纵联阻抗 电磁暂态程序(EMTP)仿真 动模仿真 

分 类 号：TM773[电气工程—电力系统及自动化]