Study On Energy-saving Optimum Design Of Metro Traction Power Supply System

Nowadays,the rapid increase of population in major cities has resulted in traffic jams and poor traffic.The emergence of urban rail transit makes the use of traffic resources more fully and effectively eases the problem of urban traffic congestion.However,with the rapid development of urban rail transit,there are still some problems to be solved,among which there are still many measures to be improved on how to effectively use the residual energy brought by regenerative braking.Traditional solutions use resistor or energy storage modules,which may bring unexpected heat or increase unnecessary cost of facilities.Therefore,in view of the existing problems of traditional urban rail transit,this thesis proposes a regenerative braking energy feed solution based on the existing technology,which is proved to be feasible by theory,and verified by simulation and experiment.This thesis introduces the main structure and various operating conditions of the energy fed traction power supply system,mainly describes the working principle and control method of its core PWM rectifier,establishes the mathematical model of the switch function,transforms the AC multi coupling model to the DC model through coordinate transformation for control,designs the control parameters,and according to the control method,controls the capacitance of the key components in the converter The parameters of inductor are designed,and the design results are verified by MATLAB simulation.The energy absorption device of regenerative braking with inverter feedback researched in this thesis is a regenerative braking device with energy feedback,traction power supply,reactive power compensation and other functions,This thesis mainly introduces its principle and function in energy-saving,traction power supply and reactive power compensation,and its "four quadrant" operation ability Without increasing any hardware cost,the reactive power required by the medium voltage energy feed device can be controlled to send to the medium voltage AC power grid by implanting the corresponding control program,so as to realize the reactive power compensation for the medium voltage ring network,improve the system power factor,multi-purpose one machine,save investment and reduce the type of equipment.In this thesis,the reactive power compensation function is verified by MATLAB simulation,and the excellent characteristics of regenerative braking device in energy saving are verified by the real data of Beijing metro line 14.This thesis mainly focuses on the energy-saving optimization design of metro traction power supply system,from the working principle of energy fed traction power supply system,reactive power compensation function,energy-saving characteristics,etc.