带可控串补和可调电抗器输电线路纵联保护新原理  

New Pilot Protection Principle of Transmission Line with Thyristor Controlled Series Capacitors and Thyristor Controlled Reactor

作　　者：索南加乐[1] 何世恩[1,2] 粟小华[3] 张健康[3] 李怀强[3] 李瑞生 

机构地区：[1]西安交通大学电力设备电气绝缘国家重点实验室,西安710049 [2]甘肃省电力公司,兰州730050 [3]西北电力调度通信中心,西安710048 [4]许继电气股份有限公司,河南许昌461000

出　　处：《西安交通大学学报》2008年第10期1259-1263,共5页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(50677051);国家科技攻关计划资助项目(2005BA208C);西北电网有限公司科技资助项目

摘　　要：提出了一种适用于带可控串补和可调电抗器输电线路的故障分量综合阻抗纵联线路保护新原理.利用故障时线路两端故障分量电压相量和与故障分量电流相量和的比值,来判断线路上是否发生了故障.在外部故障时,该比值反映输电线路上的容抗,其模值较大,内部故障时,该比值反映系统电源阻抗和线路阻抗,其模值相对较小,据此可以区分线路上的内部和外部故障.新原理易整定,本身具有选相能力,不受电容电流的影响,不受可控串补电容以及可调电抗器的影响,耐受过渡电阻能力强.利用中国电力科学研究院西北750 kV系统动模系统参数验证了原理的有效性.A new pilot protection principle based on fault component integrated impedance of transmission iine with thyristor controlled series Capacitors （TCSC） and thyristor controlled reactor （TCR） is proposed. The fault component integrated impedance becomes a ratio of the sum of the fault component voltage phasor to the sum of the fault component current phasor of two terminals. It is used to identify if a fault exists on the line. If the fault is out of the line, the calculation value of fault component integrated impedance reflects the line capacitive impedance with a greater amplitude; if the fault is on the line, it reflects the system impedance and line impedance with a relatively smaller amplitude. According to the amplitude of the fault component integrated impedance, the fault location can be distinguished. The new principle relays can be set easily and has phase selection capacity, which gets free from the influence of capacitive current and TCSC and TCR, and resists the higher fault resistance. The effectiveness of the new principle is validated by dynamic simulations of the northwest 750 kV system model.

关 键 词：输电线路 纵联保护 故障分量 综合阻抗 可控串补 可调电抗器 

分 类 号：TM77[电气工程—电力系统及自动化]