| Due to the short distance between urban rail transit station sections,frequent braking will generate considerable regenerative braking energy,and this part of the regenerative braking energy can be fed back to the contact line for traction trains to use immediately.At the same time,the regenerated braking energy that is not used immediately can be fed back and absorbed by the feedback device.Therefore,this paper studies from the two perspectives of instant utilization and delayed utilization of regenerative braking energy which aims to reduce the total energy consumption by improving the utilization rate of regenerative energy and studying the configuration method of the feedback device.The main research contents of the thesis are as follows:(1)Mathematical modeling and analysis of the components of the urban rail transit power supply system,establishing a model including trains,contact line,running rails and DC traction power supply system.It is equivalent to a time-varying electrical network model,and the related equations are established to solve it through the power flow calculation,and the power flow distribution of each node is obtained.(2)Under the condition that the train velocity curve and interval operation time remain unchanged,aiming at the lowest total output energy consumption of the traction power supply system,an optimization model of dwell time under the constraints of departure interval,dwell time and total operator time is established.The energy-saving schedule of the train is obtained by using the particle swarm optimization algorithm,which improves the instant utilization efficiency of regenerative braking energy and reduces the total energy consumption of train traction.(3)A traction power supply calculation model with a feedback device is established,and the energy consumption changes before and after the feedback device installed in each traction station are calculated.The results show that the feedback device effectively absorbs the regenerative braking energy of the train.On the basis of the calculation results,the paper analyzes the demand capacity and site selection optimization of the feedback device,and evaluates the effects of different schemes.(4)Based on an actual subway line,the thesis develops the calculation and optimization simulation software of urban rail transit traction power supply.Based on the optimization model of dwell time,the software obtains the energy-saving schedule,and then the simulation calculation shows that the optimization of the dwell time effectively reduces the energy consumption of the traction output and effectively improves the utilization efficiency of the regenerative braking energy.Finally,the utilization rate of regenerative braking energy is the highest through the putting into use of the feedback device. |
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