地铁供电系统中压开关柜电流分析理论和方法

通过分析地铁供电系统不同电压等级的设备电流特征,确定35 kV电压等级设备电流可构造标准曲线,采用机器智能学习算法分析、测算地铁供电系统中各类开关峰谷时段运行电流,以均值-方差方法确定电流的高度异常偏离点,实现异常点数据周期内统计以及实时提醒功能。应用电流实测值分析电流在工作日、节假日的不同曲线,为负荷预测和非正常运行方式下的负荷叠加风险提供预测和评估依据,保障供电系统的安全运行,提高负荷管控效率。

Current analysis theory and method of medium voltage switchgear in metro power supply system

By analyzing the characteristics of equipment current at different voltage levels in metro power supply system,this paper determines that the standard curves of equipment current at 35kV voltage level are confi gured,and the peak and minimum value characteristics of different stations and lines are defined.A machine intelligent learning algorithm is used to analyze and calculate the peak value and minimum period of operational current of various switchgears in metro power supply system,and the Average and Variance Method is used to determine the power consumption fl ow height abnormal deviation point,realize abnormal point data cycle statistics and real-time alarming function.The measured value of current is used to analyze the different curves of current in working days and holidays,so as to provide reference of basis for forecasting and evaluating the load superposition risk under load forecasting and abnormal operation mode,ensure the safe operation of power supply system,and improve the effi ciency of power load management and control.