牵引网输电导线温度及其载流量预测

Temperature and Current-carrying Capacity Prediction of Transmission Wire in Traction Network

牵引网输电导线温度和最大允许持续载流量是牵引网负荷调度过程中主要考虑的两个参数,而现行的计算牵引网输电导线运行温度和最大允许持续载流量的方法主要是依据经验或者采用保守气象条件下利用电热耦合理论计算的结果,这是不符合实际情况的.首先介绍了电热耦合理论,并分析了牵引网等效电路模型;其次,提出基于气象预报技术和列车运行图的牵引网输电导线运行温度及载流量的预测方法;最后通过算例仿真结果,分析了环境因素和导线实时载流对输电导线温度的影响,以及输电导线运行温度和最大允许载流量受列车负荷和环境因素影响的变化过程.仿真研究结果表明:牵引网输电导线温度和最大允许持续载流量受地理气候因素影响明显,在牵引网调度过程中应根据牵引网所在地区的地理气候条件进行预测计算.

The temperature and maximum allowable current-carrying capacity of transmission line in the traction network are two main parameters which should be considered in the process of load dispatching of traction network.However,the current method of calculating the operation temperature and maximum allowable current-carrying capacity of transmission line in the traction network is mainly based on experience or the results calculated by using electric-thermal coupling theory under conservative environmental conditions,which is not consistent with the actual situation.This paper first introduces the electric-thermal coupling theory and analyzes the equivalent circuit model of the traction network;secondly,based on the weather forecast technology and train diagram,a method for preadicating the operating temperature and current-carrying capacity of transmission line in the traction network is proposed;finally,through the simulation results of cases,the influence of environmental factors and real-time current-carrying capacity on the temperature of the transmission line and the change process of current-carrying capacity and temperature of transmission line in the traction network affected by the trainload and environmental factors are analyzed.The results indicate that the temperature and the maximum allowable continuous current-carrying capacity of the transmission line in the traction network are affected greatly by geographical and climatic factors,so the forecast and calculation should be made according to the geographical and climatic conditions of the area where the traction network is located in the dispatching process of traction network.