Research On Coupling Control System Of Dual Source Motor For Fuel Cell Vehicle

With the continuous development of new energy vehicles,fuel cell vehicles are increasingly recognized by the society and are regarded as the most promising cars.However,the currently widely used drive system of fuel cell vehicle requires a high-power DC-DC converter,which is expensive and has a loss of efficiency.In view of this problem,this paper proposes to introduce dual-source permanent magnet synchronous motor into the fuel cell vehicle power system,and replace the DC-DC converter with the coupling relationship between the inductances of two windings.In addition to solving the above problems well,it can also improve the integration and reliability of the system.In order to achieve this goal,an excellent control system is required,which is also the main research content of this paper.And the following work has been carried out.Firstly,this thesis consults a large number of relevant literatures and materials for the research objects,and traces the research progress of global advanced fuel cell vehicles.It summarizes the drive system of fuel cell vehicles and analyzes the research status and theoretical basis of multiphase motors.According to the characteristics of the dual-source motor and the research content of this thesis,the dual d-q modeling method is used to build the mathematical model of dual-source motor.The coupling relationship between two windings are analyzed.And the Simulink model of dual source motor is built as well.Then,the working conditions of the dual-source motor for fuel cell vehicle are analyzed.The working states of two windings are analyzed under the driving condition,and the vector control model of the dual source motor is built.Under the zero speed and torque condition,the method controlling the current zero on q-axis is used to keep the output torque and the rotational speed of the motor zero.The energy transferred from the fuel cell to the secondary battery is completed through the d-axis.And the energy transfer model between two windings are built.Applicability of the dual-source motor for fuel cell vehicles is proved by simulation.Secondly,the hardware requirements of the dual-source motor control system are analyzed,based on the Infineon TC275 microcontroller.The design of the control system hardware is carried out according to the V-type development mode and the functional safety requirements.The fabrication and soldering of the PCB of the control board and the driver board are completed.According to the software requirements of the control system,the program of multicore control system’s service software and application software are completed.Finally,a dual-source motor test bench was built with D&V motor test system and Vector calibration and measurement system.Through the bench test,the previous simulation model and simulation results were verified,and the applicability of the dual source motor for fuel cell vehicle system is proved as well.