考虑铁路牵引负荷接入的电力系统小干扰稳定性分析  

Small signal stability analysis of power system considering railway traction load access

作　　者：姜晓锋 韩晓言[2] 潘鹏宇 陈刚 JIANG Xiaofeng;HAN Xiaoyan;PAN Pengyu;CHEN Gang(Electric Power Research Institute,State Grid Sichuan Electric Power Company,Chengdu 610041,China;State Grid Sichuan Electric Power Company,Chengdu 610041,China)

机构地区：[1]国网四川省电力公司电力科学研究院,四川成都610041 [2]国网四川省电力公司,四川成都610041

出　　处：《电力科学与技术学报》2024年第4期61-69,共9页Journal of Electric Power Science And Technology

基　　金：国网四川省电力公司科技项目(52199722000Z)。

摘　　要：随着电气化铁路的飞速发展,电气化铁路牵引负荷已成为中国电力系统中最大的单体负荷,但其负荷特性对电力系统小干扰稳定性的影响尚不明晰。为此,首先建立电气化铁路牵引负荷等效数学模型,并基于此构建考虑牵引负荷接入的电力系统小干扰模型;其次利用特征值分析方法,分析牵引负荷机车速度、机车数量以及牵引负荷接入位置和占比对电力系统小干扰稳定性的影响;最后通过特征值根轨迹寻找同步发电机励磁参数的调节范围,并分析牵引负荷接入前、后和不同牵引负荷参数对电力系统励磁参数调节范围的影响。研究结果表明:牵引负荷接入后电力系统小干扰稳定性降低,系统励磁参数调节范围收缩,系统稳定裕度降低。With the rapid development of electrified railways,the traction load of electrified railways has become the largest single load in China's power system,but the impact of its load characteristics on the small-signal stability of the power system is still unclear.Therefore,an equivalent mathematical model of the traction load of electrified railways is established,and based on this,a small-signal model of the power system considering the access of traction loads is constructed.Secondly,using eigenvalue analysis methods,the impacts of locomotive speed,locomotive quantity,and the access location and proportion of traction loads on the small-signal stability of the power system are analyzed.Finally,the adjustment range of excitation parameters of synchronous generators is determined through eigenvalue root locus,and the impacts of traction loads before and after access and different traction load parameters on the adjustment range of excitation parameters of the power system are analyzed.The research results indicate that after the access of traction loads,the small-signal stability of the power system decreases,the adjustment range of system excitation parameters shrinks,and the system stability margin reduces.

关 键 词：电力系统 小干扰稳定性 特征值分析法 牵引负荷 特征值根轨迹 

分 类 号：TM712[电气工程—电力系统及自动化]