城市轨道交通电力牵引动力负荷精准估计研究

Research on accurate estimation of electric traction power load of urban rail transit

针对当前使用的基于最小二乘多项式、贝塔函数的估计方法缺少对列车运行阶段的分析,导致估计结果不精准的问题,提出了城市轨道交通电力牵引动力负荷精准估计研究。对城轨交通牵引系统的结构进行分析,设计牵引动力负荷精确估计流程,将牵引、行驶阻力与制动力相结合,计算列车的合力,根据列车运行过程示意图,分析列车受牵引、惰行和制动后的运行状态,建立牵引力网络模型,计算线路电阻,判断两端电压是否达到预设的收敛精度,剔除冗余数据,设计负荷预测流程。由实验结果可知,该方法在近期、中期情况下,预测轨迹与实际日负荷预测轨迹一致,在远期情况下,与日负荷预测轨迹存在一定误差,最大相差3×103kW。

Facing the problem that the current estimation methods based on least square polynomial and beta function lack the analysis of train operation stage,which leads to inaccurate estimation results,this paper puts forward the research on accurate estimation of electric traction power load of urban rail transit.The structure of traction system of urban rail transit is analyzed,and the accurate estimation process of traction power load is designed. Combine traction,driving resistance and braking force to calculate the resultant force of the train. According to the schematic diagram of train running process,the running state of train after traction,idling and braking is analyzed. The traction network model is established,the line resistance is calculated,whether the voltage at both ends reaches the preset convergence accuracy is judged,redundant data is eliminated,and the load forecasting process is designed. The experimental results show that the predicted trajectory of this method is consistent with the actual daily load prediction trajectory in the near and medium term,and there is a certain error between it and the daily load prediction trajectory in the long term,with a maximum difference of 3×103kW.