Control Strategy Optimization Of Induction Motor For Fuel Cell City Bus

AC motor is widely applied in electric vehicle, especially in Fuel Cell City Bus, for its reliable operation, low cost and high power density. Motor control is one of critical technologies within the area of electric vehicle. Due to the development of power electronics and control theory, motor control is developing rapidly. The control strategy of induction motor for Fuel Cell City Bus is studied in this thesis.First of all, the platform for control strategy development is introduced. Including the hardware and the software, the platform is designed and developed specifically in this thesis. The hardware mainly consists of the three-phase inverter composed of IGBTs and the control circuit in which DSP TMS320F28335 is applied as the control core. The hardware is reliable and fulfils the requirement of control strategy development. The development of motor control program is carried out with C language in Code Composer Studio, through which DSP can be controlled efficiently. The readability and portability of control program are also improved.In addition, the basic control strategy of induction motor for Fuel Cell City Bus is carried out, which bases on the analysis of indirect field-oriented control and power conversion technology. The simulation of the basic control strategy is studied in MATLAB/Simulink. Then the basic control strategy is optimized with the efficiency optimization control strategy based on loss model. Simulation results show that the efficiency of induction motor can be improved with the optimized control strategy.Last, vector control of induction motor and power conversion technology, including hysteresis bandwidth control and space vector PWM, are studied on the control strategy development platform. And the torque stability is tested with the optimized control strategy. The test results indicate that the control strategy which is developed in this thesis meets the basic requirement of electric vehicle.