Research And Design On Vector Control Module For A Certain Type Of Inverter

In the design of vector control module for a certain type of inverter, use the scheme ofhigh-performance speed-sensorless vector control system to overcome the problems likeinstallation difficulties and high cost brings by optical encoder is important for thedevelopment of vector control system.This paper first introduces the mathematical model of the induction motor and theprinciple of vector control, on this basis, get the induction motor vector control systemprinciple diagram which combined with the rotor magnetic field orientation and space vectorpulse width modulation technology (SVPWM). In order to get the speed information to berequired in the vector control system, determine MRAS to be the speed identification schemein this paper after identify the advantages and disadvantages of several speed identificationschemes, and introduced the principle, structure and estimate approach of MRAS.Then build the three-phase induction motor speed sensorless vector control systemsimulation model in Matlab/Simulink simulation environment according to induction motorvector control system principle diagram. The simulation results show that this control systemhas good static and dynamic response, high precision, overall stability, and structure simple, soit has good practicability and feasibility.Finally, complete the three-phase induction motor speed sensorless vector control systemsoftware programming with the DSP chip TMS320F2808 which product by TI company as themain control unit. Detailed the flow charts of important parts, include: Initialization flow chart,per unit conversion flowchart and parameter self-learning flow chart under main program, andcoordinate transformation flow chart, PI regulator flow chart, MRAS flow chart, and SVPWMalgorithm flow chart under underflow interrupt subroutine. The preparation of this programchange the theory to be Practical.