Research On Regenerative Braking Energy Recovery Technology Of Urban Rail Transit System

At present,energy conservation and environmental protection have become two major themes in the development of human society.With the continuous improvement of the urban rail transit system,the electric energy consumed in the running process of the train in the urban rail transit system is also increasing.For this reason,some urban rail transit systems have set regenerative braking energy storage devices to store the braking energy of trains and reduce the consumption of electric energy during train operation.However,some trains are still unable to achieve regenerative braking in many cases.Therefore,the regenerative braking energy recovery technology of train is studied to reduce the consumption of electric energy during train operation.This paper analyzes and studies the electric energy consumption of the planned line and the existing line by using the line data and train data,and determines the electric energy consumption in the same power supply interval.If the electric energy generated by regenerative braking cannot be fully utilized by other trains within the same power supply interval,then the net power and the residual feedback electric energy of the power supply interval are determined,and an energy storage device is added to the system to absorb the remaining feedback electric energy of the power supply interval.Based on the planned operation mode and passenger flow prediction results,a set of calculation algorithm for the net power of the power supply interval is established to predict the power consumption of the power supply interval.This algorithm can determine the electric energy and electric power of each train at any moment and the regenerative braking energy that the train can feed back to the grid under ideal circumstances,and thus determine the net power and the remaining regenerative braking energy in a power supply interval at any moment,providing a basis for determining the parameters of the energy storage system.For the existing circuit,a set of analysis algorithm is determined by using the actual running data on the circuit.The power consumption of the power supply interval is analyzed by using this algorithm,and the net power of the power supply interval at any time and the change curve of the net power with time are determined.According to the net power time curve,the power and capacity of the energy storage device are determined.In order to determine whether additional energy storage device is needed in the power supply interval,the power consumption of the train in the ideal running process is analyzed.If additional energy storage devices are needed,the power and capacity of energy storage devices in each power supply interval shall be determined according to the net power time change curve of the power supply interval,and the energy storage system shall adopt the unit combined energy storage system.