直流牵引供电系统的建模以及参数分析

建立正确的短路模型并对其进行数学描述是研究地铁直流牵引供电系统保护的基础。在分析地铁运行期间牵引供电系统短路电流的衰减振荡波形时发现了电流上升率+电流增量保护(地铁直流牵引供电系统主保护)短路模型的缺陷。结合二阶系统时域分析,建立了地铁短路系统的二阶模型,并对模型进行了数学分析。仿真结果证明该模型对地铁直流牵引供电系统电流上升率+电流增量保护误动作的排除及其相关问题的研究具有十分重要的意义。

Modeling and Parameter Analysis of DC Traction Power Supply System

To build a correct short-circuit model and to describe the model mathematically are the fundamental researches for the protection of subway DC traction power supply system.The defects of the short-circuit model based on the current rising rate and current increment protection（the main protection of subway DC traction power supply system） were discovered in this paper by analyzing the short-circuit current wave of decay oscillation occurred during the operation of subway.A second order model was created and analyzed mathematically by combing the theory related to the time domain analysis of second order system.The simulation result shows that the model is correct.It has great significance in aspects of protection research based on the theory of difference of current,the exclusion of false protective action and other relative problems.