城市轨道交通列车电制动地面电阻吸收装置相关参数分析

在地面电阻吸收装置工作的有效区段内,根据列车的电制动特性和供电臂内列车状态的不同,合理地确定制动电阻的技术参数。采用多支路形式的电阻吸收装置,可方便控制电阻吸收装置并可靠吸收列车电制动功率。研究表明,地面电阻吸收装置的输出电流脉动与斩波器的导通比、各支路斩波器的开关滞后角有关。通过分析列车电制动时的最大再生功率与电阻吸收装置的电阻值、电制动时刻牵引供电系统的模型、列车电流、网压降之间的关系,导出了列车电制动时最大输出功率、地面电阻吸收装置的短时功率和持续(等效发热)功率等技术参数的计算方法。给出的计算方法可与现行的城市轨道交通牵引供电计算方法相结合,构成完整的牵引供电计算方法。

Analysis on Parameters of Ground Absorption Equipment of Regenerative Braking for Urban Mass Transit Trains

Within the effective working section of ground absorption equipment,the technical parameters of braking resistance is rationally defined according to train electric braking characteristics and train status in the feeding section.The ground absorption equipment with multi-loop is applied so as to control the equipment easily and absorb reliably the electric braking power.The study shows that the output pulse value of resistance absorption equipment is related to the chopper switch conduction ration and the selection of lagging angle.The calculation method of technical parameters of maximum output power,the short time power and continued power(equivalent heating) in electric braking are derived from analyzing the relationship of maximum regenerative power with resistance value of ground absorption equipment,model of traction power supply,train circuit and network voltage drop while performing electric braking.The complete calculation methods of traction power supply for urban mass transit are established by using the calculation methods presented in this paper and the calculation methods currently in use.