Research On Orderly Charging Of Bus Charging Station And Design Of Simulation Platform

Under the guidance of low-carbon environmental protection and energy-saving and emission reduction policies,the urban bus system has put forward the development goal of comprehensive electrification,and the power system of a large number of buses is gradually changing from primary energy supply such as petrol and natural gas to clean energy such as electricity,which brings challenges to the operation of bus charging stations.At present,bus charging stations adopt the constant voltage and high current charging mode of having a pile full at the return station,which not only makes the demand for load shedding at the access point of the distribution network increasingly prominent,but also has problems such as high charging costs and unreasonable planning and allocation of charging resources.In view of the above problems,this paper carries out relevant research from the following aspects.We conducted field research on several bus charging stations of different operation scales in Beijing,collected data on vehicle operation and charging behavior of each station,and calculated the number of vehicles,departure time and departure interval of each line,as well as the speed and energy consumption per unit kilometer of vehicles of the corresponding lines through data screening and data error correction,which laid the foundation for the subsequent research on orderly charging strategy and simulation platform construction of this paper.Considering the economics of charging station operation and the demand for load shedding,responding to the time-sharing tariff policy,with the lowest charging cost as the objective,and taking the constraints of meeting the minimum power of vehicle departure,charging continuity,charging power limit,charging pile resource limitation and load shedding as the constraints,an orderly charging optimization model for electric buses is established,and corresponding solution algorithms are designed for charging stations of different operation scales.The GUROBI commercial solver is used to solve the model directly for charging stations of small-scale operation;the genetic algorithm is used to solve the model for charging stations of medium-scale operation;and the column generation algorithm is used to solve the model for charging stations of large-scale operation.This paper carries out the construction of a charging simulation platform for bus charging stations,and carries out the page design of the simulation platform based on the graphical user interface design function of MATLAB,simulates the behavior of bus departure operation and queuing charging under constant power disorderly charging,constant power orderly charging and variable power orderly charging strategies respectively,and verifies the influence of different charging operation modes on the economics and stability of charging station operationThe results show that for bus charging stations of different operation scales,the orderly charging strategy proposed in this paper reduces the daily charging cost and improves the utilization rate of charging piles compared with the disorderly charging strategy,while meeting the normal operation and peak-cutting demand of buses.In addition,the charging simulation platform built in this paper helps to complete the charging scheduling simulation experiments for electric buses and provides decision support for the operation management of charging at bus charging stations.