摘要
在系统分析基于串联补偿电容器下输电线路纵联阻抗性能特点和阻值特征的基础上,特别在详细分析串联补偿电容器及其附属的金属氧化物变阻器(MOV)、放电间隙等不同的运行方式在纵联阻抗产生影响的前提下,确立了纵联保护的甄别方法.由于在串联补偿下输电线路分布电容和系统运行方式共同影响纵联阻抗的阻值,因此通过分析和计算才能确定是否需要补偿.一旦纵联阻抗幅值小于设定数值时,就可确定发生区内故障,保护将正确动作;否则,就断定在保护区内没有发生故障,保护将稳定不动.在EMTP软件的仿真中,建立了一条1 000 kV、500 km含工频串联补偿度为45%串联补偿电容器的特高压输电线路模型,进行了在各种故障下的仿真模拟,仿真结果验证了上述纵联阻抗及其算法在串联补偿环境下具有足够的稳定性和可靠性.
According to the systematic analysis for performance and impedance value of the transmission line pilot impedance based on the series compensation capacitors, especially for the influences of the different operation modes of the series compensation capacitors and subsidiary metal oxide varistor （MOV）, and the discharge gap on the pilot impedance, a discrimination method of the related pilot protection is established. Because the distributed transmission line capacitances and the system operation modes mutually affect the pilot impedance, the necessity of compensation for pilot impedance can be determined via calculation. When the amplitude of the pilot impedance is smaller than the setting value to demonstrate the internal fault, the pilot protection is correctly operated; otherwise the pilot protection is stably be blocked. In the EMTP simulation, an UHV transmission line model of 1 000 kV, 500 km, including the series compensation capacitors of 45% power frequency series compensation degree, is constructed to simulate different types of faults.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2011年第6期97-103,共7页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金资助项目(51037005
50877061)
高等学校博士学科点专项科研基金资助项目(20070698057)
关键词
输电线路
纵联阻抗
纵联保护
串联补偿
transmission line
pilot impedance
pilot protection
series compensation
