Research Of High-power Interior Permanent Magnet Synchronous Generator Control System For Vehicles

Under the rapid development of the global economy,the new energy vehicle industry is booming.In view of its energy-saving and environmental protection advantages,electric-powered vehicles are receiving widespread attention from countries around the world.Hybrid vehicles play an irreplaceable role in the development of electric vehicles.Endurance is an important performance indicator for electrically driven vehicles,which depends primarily on battery capacity and the efficiency of the electric machine and its control system.Based on the characteristics of high power factor and high efficiency of permanent magnet machine and the advantages of rare earth resources in China,most of the domestic electric machine systems for vehicles are mainly developed around permanent magnet machines and their controllers.Therefore,this thesis takes the high-speed interior permanent magnet synchronous generator variable speed rectification and voltage regulation control system for hybrid vehicles as the research object,and deeply studies its model and control algorithm.Firstly,the industry background and trend of the development of new energy vehicles was introduced,the advantages and disadvantages of different types of motor vehicles were analyzed and compared.Based on the current domestic development background and market conditions,the interior permanent magnet generator variable speed rectification and voltage regulation system was selected as the object of this paper.Then the related research on the control strategy at home and abroad had been done.Secondly,considering several main types of permanent magnet synchronous machines,the mathematical model of the machine and the basic vector control method were expounded.The advantages of the weak magnetic control of the generator were analyzed.Two main control methods of control--direct-axis voltage weakening control and the Maximum Torque Per Ampere(MTPA),were compared through the simulation analysis.The direct-axis voltage weakening control method had shortcomings under the rated speed,while the Maximum Torque Per Ampere control method had strong dependence on the motor parameters and the calculation was difficulty.A control method based on the speed feedback direct-axis voltage weakening was proposed.The simulation results showed that the proposed method cancombine the advantages of the above two methods to a large extent.Finally,a 500-kW interior permanent magnet synchronous generator variable speed rectification and voltage regulation control system was built.The system configuration was introduced.The hardware design and software development and debugging of the system drive circuit were carried out.The DSP control chip of TI Company was selected.The chip,the generator and the matching rectifier were tested in various working conditions,and the feasibility of the proposed speed feedback direct-axis voltage weakening control method was demonstrated.