摘要
提出了一种基于参数识别的双端带并联电抗器的输电线路纵联保护原理.在故障附加状态网络的基础上,为内部故障和外部故障建立了具有相同形式的电感模型.利用参数识别的原理求取模型中的电感参数,并计算其对应感抗.内部故障时,它反映两端的系统感抗,为一个较小的负数;外部故障时,它反映并联电抗器的感抗,是一个较大的正数.根据所得感抗的符号和大小来区分内部故障和外部故障.该原理采用了基于线路π模型的解微分方程算法,不受非周期分量和过渡电阻的影响,整定简单.EMTP和动模实验数据仿真验证了该方法的有效性.
A new type of pilot protection for transmission line with shunt reactors at double terminal following parameter identification is proposed. Based on the fault component nets, R-L models with the same pattern are established for the internal fault state and the external fault state. The inductance in R-L models can be evaluated by parameter identification. When an internal fault occurs, the inductance reflects the impedance of the system source as a smaller minus, and when an external fault occurs,it signs the inductance of reactor as a greater positive,thus the internal fault and external fault are distinguished. The criterion is not influenced by the transient components and fault resistance, and also can be easily set. EMTP simulation shows the higher sensitivity, reliability and effectiveness.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2009年第10期99-103,共5页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金资助项目(50677051
50877061)
国家"973计划"资助项目(2009CB219704)
关键词
输电线路
纵联保护
参数识别
并联电抗器
transmission line
pilot protection
parameter identification
shunt reactor
