Research On Discrete-Time Model Reference Adaptive Drive System Of Fuel Cell Electric Vehicle

With the advantages of energy-saving and non-pollution, the FCEV has become an industry fast developed in different countries of the world. Motor drive system is the key technology, which directly influences the all-round performances of FCEV. This paper discusses the control strategy of motor drive system and conducts the design and study of FCEV discrete-time model reference adaptive driver system.It introduces the motor drive system's structure and principles of operation of FCEV experiment system. Then the open-loop math model is established according to parameters of experiment system. Based on it, the double closed-loop drive system with current PI control and speed PI control is designed. The parameters of the regulator are designed and the double closed-loop system math model is established. The simulation study is done and the performance is analysed based on MATLAB/SIMULINK. The results of the simulation show that PID control can't meet the higher requirements of FCEV motor drive system.Be dead against the lack of the PID control, this paper discusses the discrete-time model reference adaptive control methods applies to the motor drive system. The PI control of speed is replaced by discrete-time MRAC while the PI control of current is retained. Then the motor drive system is obtained and the math model is established. In simulation study, the comparation of the robustness, disturbance rejection and dynamic performance indexes between the two control methods is conducted. The results show that the MRAC system is better than the PID control system.Taking TMS320LF2407 as the core, the hardware circuits and the software programs of FCEV discrete-time MRAC system are designed. The hardware system includes the speed measurement circuit, current measurement circuit, PWM drive circuit and DSP exterior circuit. The software programs include main program, PWM interrupt program, PI control program of current and MRAC control program of speed. The experiment results in FCEV experiment system show that the design is correct and feasible.