| In urban rail transit,modern tram is a product between subways and regular public buses on the ground.They are between the two in terms of construction cost,transportation capacity,and service quality,which can effectively alleviate the burden of urban traffic.Intermittent power supply trams use the on-board energy storage system as the power source,and are supplied with energy through the ground charging device installed in the station to realize the full-line operation of energy storage trams.The configuration of scientific and economical on-board energy storage system and ground charging device can not only meet the daily needs of trams,but also save costs for tram planning,construction and operation.At the same time,effective energy management strategies can optimize the power distribution among hybrid energy storage components,improve the health of the energy storage components,and improve system efficiency.Based on this,this article has carried out the following work around the optimal configuration and energy management strategy of intermittently powered trams:(1)According to the operating characteristics of the tram and the output characteristics of the hybrid power system,a comparative analysis of the existing four topological structures is carried out,and the control effect,capacity utilization rate,economic cost and other factors are comprehensively considered,After selecting a suitable hybrid topology,adding a ground charging device,designing an intermittently powered tram hybrid system topology,and setting up a corresponding simulation model in the Matlab/Simulink environment.(2)Established a life cycle cost model for the intermittently powered tram power system including on-board energy storage systems and ground charging devices;Based on the existing distribution model of charging piles equidistant stations,two new charging pile configuration schemes are proposed: charging piles equidistant distribution and charging piles equidistant energy distribution models.(3)Comprehensive consideration of vehicle dynamic performance,line conditions,voltage level,energy storage element SOC,energy storage system volume and weight and other constraints,determine the configuration parameter range of the HESS.The optimal configuration schemes under the three distribution models of "equal station","equal distance" and "equal energy" of charging piles are optimized and compared and analyzed by genetic algorithm.The results show that the economic efficiency of the proposed new charging pile distribution model is better than the equal-site distribution model,and the optimal configuration scheme appears in the eight-station charging scheme under the charging pile equal energy distribution model.Compared with the optimal configuration scheme of the equal-site distribution model,its life cycle cost is reduced by 9.77%.(4)On the basis of the optimal configuration of the locomotive,simulation is carried out with an energy management strategy based on power follow control to verify the effectiveness of the configuration method.Secondly,starting from the perspective of optimizing power allocation and taking value loss as the objective function,an energy management strategy based on Pontryagin minimum principle control is proposed.Finally,the simulation results of the energy management strategy based on power follow control are compared to verify the superiority of the proposed energy management strategy. |
PDF Full Text Request