基于瞬时功率理论的牵引供电系统短路故障辨识  

Instantaneous Power Theory-based Identification of Short Circuit Faults of Traction Power Supply System

作　　者：陈彦初 高仕斌[1] 韩正庆[1] CHEN Yanchu;GAO Shibin;HAN Zhengqing

机构地区：[1]西南交通大学电气工程学院

出　　处：《电气化铁道》2021年第4期5-9,共5页Electric Railway

基　　金：高速铁路牵引网电弧故障继电保护原理研究,国家自然科学基金(51777174);枢纽供电系统广域保护测控关键技术研究,中国国家铁路集团有限公司科技研究开发计划(N2019G018)。

摘　　要：牵引供电系统中馈线电流增量保护通过短时间内电流变化的幅度来区分负荷电流和故障电流,由于和谐号交-直-交机车/动车组过分相时能迅速启动并恢复牵引负荷,导致负荷电流突变率高,容易造成电流增量保护的误动。本文基于瞬时无功功率理论,提出利用电流突变时的功率变化率作为特征值,区分励磁涌流和短路故障电流,可作为电流增量保护的辅助判据,并通过Matlab/Simulink仿真验证了该方法的可行性。In traction power supply system,feeder current increment protection distinguishes load current from fault current by the amplitude of current variation in a short time,since the Harmony AC-DC-AC locomotive/EMU can start up quickly and recover the traction load when the locomotive is passing through the phase break,it leads to the high mutation rate of load current,resulting in malfunction of current increment protection.On the basis of instantaneous reactive power theory,the paper proposes to use the power change rate as the characteristics value when there is sudden change of current for distinguishing excitation inrush current and fault current,it can be used as the auxiliary criteria for current increment protection.The feasibility of the method has been verified by Matlab/Simulink simulation.

关 键 词：牵引供电系统 瞬时无功功率理论 电流增量保护 短路故障 

分 类 号：U224.1[交通运输工程—道路与铁道工程]