Research And Simulation Of Energy-saving Technology For Subway Train Operation Based On Multi-objective

Metro transit system is a large power user in urban power grid,so it is very important to study energy saving of urban rail transit system.Metro operation strategy energy-saving technology is a technology that does not change the structure of metro trains and traction power supply network,only change train operating conditions and stop time and departure interval to achieve energy-saving targets.Based on the summary of domestic and foreign research,this paper completed the following aspects of the work:Firstly,the composition of urban rail transit power supply system is analyzed,and the components of DC traction network are modeled from the global point of view,to provide a more accurate calculation model for energy consumption calculation.Secondly,the energy-saving algorithm of single-train is proposed.This paper deduces the equations of motion of trains from traction,braking force,weight and so on,and the factors such as resistance,slope height,speed limit and curve segment.Minimum energy consumption,fixed running time,fixed-point parking are selected to build the single train driving model.Enhanced brute force algorithm is selected to solve this model.Then the energy-saving algorithm of multi-train operation is proposed.The process of braking energy transfer in the process of multi-train operation is analyzed.By integrating the up and down lines into the unified traction power calculation,the process of solving the multi-node nonlinear power supply model is analyzed.Aiming at the characteristics of multi-vehicle operation,a multi-train energy-saving model with the targets of minimum energy consumption,the travel time is established.This model is subjected to the pairs of trains in all-day arrangement,high and low peak time arrangement.Genetic algorithm is used to obtain the optimal stop time and departure interval,and calculate the energy consumption,train energy consumption and line loss.Finally,the simulation of the Guangzhou Metro Line 7 phase 1 is carried out by using the single-train energy-saving algorithm and multi-train energy-saving algorithm.According to the civil engineering,electrical,train technical documents,basic data of 7th line is obtained.Simulation is operated to get the most energy-efficient all-day operation schedule of the whole line.Results shows that the optimal operation schedule can reduce the loss of 6.24%theoretically.