Research On SVPWM Vector Control Technology Of Five-phase Induction Motor

In this thesis,five-phase induction motor is taken as the research object.Based on the Space Vector Pulse Width Modulation(SVPWM)technology,the modulation algorithm suitable for five-phase induction motor vector control is selected.At the same time,the simulation platform and on board experimental platform of five-phase induction motor vector control system based on rotor field orientation are built to verify the effectiveness of the control method.First of all,because the mathematical model of five-phase induction motor in natural coordinate system is quite complex,the mathematical model of five-phase induction motor under space vector decoupling transformation is deduced according to the space vector decoupling transformation theory,which greatly simplifies the mathematical model.At the same time,MATLAB/Simulink software is used to build the motor body simulation model,and the simulation results verify the correctness of the mathematical model building.Secondly,due to the increase of the number of motor phases,the five-phase inverter becomes more complex.The voltage vectors reach 32,and the SVPWM algorithm is also diverse.This mainly analyzes the basic working principle of Adjacent maximum two vectors(NTV-SVPWM)algorithm and NFV-SVPWM algorithm,and verifies the advantages of NFV-SVPWM algorithm,such as high sinusoidal degree of phase current and better suppression of triple harmonics,so this paper chooses this modulation algorithm as the control mode of five-phase induction motor.Finally,in the vector control technology of five-phase induction motor,the vector control method based on rotor field orientation is adopted to control the flux linkage and torque separately in the fundamental wave subspace.The simulation system of five-phase induction motor based on rotor field oriented vector control is built on MATLAB/Simulink,and the main parameters and control results of the motor’s starting characteristics,steady-state characteristics and dynamic characteristics are analyzed in detail.At the same time,with STM32F407ZGT6 as the main controller,loading control experiment platform of five-phase induction motor is built.The hardware circuit and software program required in the experiment are debugged and written respectively.According to the results of the experiment,the correctness of the control strategy of five-phase induction motor is verified.