Research On Low Voltage And High Power AC Servo Control System

As fuel vehicle,high-altitude vehicle plays an important role in the national infrastructure.But its power consumption,noise and exhaust emissions are serious,so its transition to electric vehicles is an inevitable trend.Due to the influence of battery technology,most of the high-altitude electric vehicles are low-power,which seriously restricts its development.Therefore,it is very important to design a high efficiency,high power and low power consumption high-altitude electric vehicle.In this paper,the high-altitude electric vehicle is taken as the research object and the permanent magnet synchronous motor is taken as the control object to designs a low-voltage high-power AC servo control system of efficient and anti-interference.Firstly,through the design parameters of the control system to determine the parameters of PMSM,and the rationality of the design parameters of PMSM is verified by JMAG.Based on the vector control theory,the mathematical control model of the PMSM is established,and the closed-loop control system of position loop,speed loop and current loop is built.The simulation model of the control system is established by MATLAB,and the response characteristics of PMSM are simulated and analyzed to verify the feasibility of the control system.Secondly,design the controller through the mathematical model of the control system.First,the hardware circuit is designed,which includes the main control module,power module,feedback module,drive module and other modules.Then the software module of the controller is designed to control the PMSM.Finally,through the analysis and optimization of the heat dissipation of the driving circuit by ANSYS,the serious problem of heating of the controller is solved.Thirdly,the torque performance of the control system is optimized.The error processing method is introduced to eliminate the phase and amplitude deviation of output current caused by current sampling quality error.The angle compensation algorithm is introduced to solve the angle feedback error of magnetic encoder caused by temperature change.The IP control of current loop is introduced,and the simulation analysis of IP and PI control of current loop by MATLAB,which proves that IP control has better anti-disturbance and speed tracking capabilities,which improves the dynamic performance of the control system.The method of harmonic injection PWM is introduced to solve the problem of low utilization of bus voltage.Finally,the experimental platform of the control system is built to verify its good stability and response ability.