Research On Dual-source Trolley Bus Isolated DC/DC Control And Energy Management Strategy

Dual-source Trolley Bus is a pure electric vehicle powered by battery and charging network.Using batteries and charging networks as power sources can increase the driving distance,reduce battery quality,avoiding over discharge of the battery,improving battery service life and efficiency,and then improve the economy of the electric vehicle.With the reasonable energy management strategy a variety of operating modes are used.It can make full use of the advantages of the charging network to improve the dynamic and economic requirements of the vehicle.At the same time,the existing charging network in the city can be reused it has broad prospects for development in the urban public transport.This paper,According to the requirements of the national standard,the simulation modeling and stabilizing control of the vehicular isolated DC/DC are carried out.The DC/DC surge model and the suppression model are established,design of rule-based energy management strategy.The simulation model is used to analysis the vehicle’s performance.Through co-simulation of CANoe and Simulink,the timeliness of the energy management strategy is tested.Through VTsystem the hardware-in-loop is carried to test the operation effect of the energy management strategy in the controller.This paper includes the following.1.The mathematical modeling of isolated DC/DC surge and its suppression has completed.Based on the isolation of DC/DC,the topology of isolated DC/DC has analyzed,and the mathematical model of isolated DC/DC surge and the simulation of MATLAB/Simulink are established and the results have compared.Then the principle and method of surge suppression have analyzed,and a mathematical model for isolation DC/DC surge suppression been established,and mathematical modeling analysis of surge suppression have carried.2.Isolation DC/DC voltage regulation control.Based on MATLAB/Simulink the simulation model of isolated DC/DC has built.Then PID control,fuzzy rule control and phase shift control have used to control the isolated DC/DC.Through comparison,the steady-state error and fluctuation of phase-shifting control are better than PID control and fuzzy control.3.A rules-based energy management strategy for dual-source trolleybus was proposed.At first the vehicle operate mode has divided into on-grid working mode-there is a charging line network for the dual-source trolleybus running section and off-grid working mode-there is no charging line network for the dual-source trolleybus running section.In these two modes,they have subdivided into grid drive mode,battery drive mode,battery-assisted drive mode,grid driving and charging mode,grid parking and charging mode,and regenerative braking mode.When the vehicle work mode is on-grid working mode,the power grid provides the electricity needed for the vehicle driving.When the grid power has a surplus,the grid will charge the battery.When the vehicle demand power is too large,a battery-assisted drive is used.When the vehicle work mode is off-grid working mode,the power battery provides the electricity needed for the vehicle driving.A simulation test had carried out in Simulink.The vehicle speed following,mode switching,battery SOC change and 100 km power consumption all met the requirements.4.Co-simulation and hardware-in-the-loop experiment analysis.A CANoe/Simulink cosimulation test and a hardware-in-the-loop test had performed to verify the timeliness and feasibility of the energy management strategy.In the CANoe/Simulink co-simulation,the100 km electricity consumption of the dual-source trolleybus is 5.15% lower than that of the traditional electric vehicle.In the hardware-in-the-loop experiment,the electricity consumption per 100 kilometers of dual-source trolleybuses had reduced by 5.53% compared with traditional electric vehicles,and the overall vehicle economy was improved.In both test methods,vehicle speed following,mode switching,battery SOC change,and 100 km power consumption all meet the requirements.In terms of vehicle speed following,the correlation between operating speed and actual speed is as high as 99%.In the experiment of using the user to step on the real pedal to control the vehicle,the real vehicle speed of the vehicle can also follow the target vehicle speed.The correlation coefficient between the two is 0.9864,which proves that the energy management strategy developed in this paper has practical application potential.