Energy Saving Operation Research On Multi-vehicle Energy Interaction And Energy Storagy System Optimization Control

The research on the strategy of train energy saving operation is to study the control strategy of the energy coupling relationship of the multiple train operation system.The usage of regenerative braking energy in urban rail transit system is an effective way to realize the energy saving operation.The utilization of regenerative braking energy is realized mainly through the optimized operation of multiple vehicles,the recovery of energy storage device and the feedback of the inverter system.However,the current research lacks the theoretical foundation for the energy distribution in the equivalent multiple train traction power supply system.This paper mainly considers the utilization of train regenerative braking energy in urban rail transit system,and analyzes the influence factors of energy distribution between multiple trains and the between train and ground super capacitor energy storage system(SC-ESS)by equivalent mathematical model.The adjustment strategy of train operation and the optimal control strategy of energy storage device(ESD)are studied.First of all,the DC traction power supply system,which includes the ground super capacitor energy storage system(SC-ESS)and the train with brake resistance,is established.The ESS and trains are described mathematically and the equivalent circuit model is set up in the model.The corresponding relationship between the energy flow and the train operation states is analyzed.Meanwhile,the accuracy of the model is verified by the experimental results in the Beijing Subway Batong Line.Based on this model,the factors affecting the energy distribution of regenerative braking are analyzed.Then,based on the train operation curve model and typical two train operation models,the equivalent mathematical models of train operation schedule and operation condition parameters are converted,and a centralized data system is established.Combined with the principle and the reasonable adjustment conditions of train operation,the online optimization strategy of train operation curve based on centralized data system is put forward.The simulation of operation curve adjustment strategy is carried out by using actual line data.Focus on the usage of the remaining regenerative braking energy,the influence of the train running state and the charging threshold voltage of the ESD on the regenerative braking energy utilization of the ESD is analyzed,through the equivalent mathematical model.The considering voltage fluctuation of charging control strategy of ESD is proposed,and the correctness of the control strategy based on the actual line parameters is verified.Finally,the night double train experiment in Beijing Metro Batong line is carried.The train operation curve of online adjustment strategy and based on the voltage fluctuation ESD charging control strategy that proposed in this paper are verified.The experimental results verify the correctness and rationality of the control strategy proposed in this paper.The results fully demonstrate the energy interaction between trains and make full use of the remaining regenerative braking energy when the ESD takes into account,so as to achieve the comprehensive energy-saving optimization of urban rail transit system.