The Research On DTC System Based On Torque & Magnetic Self-adaptive PI

With the high speed development of power electronics and computer technology, AC electricity transmission systems are replacing DC ones step by step. The typical technology for AC motor control has VVVF, VSVF, VC and DTC etc. Direct Torque Control (DTC) of asynchronous motors, which has been developed in the recent decades, is a power control method for motor drives. Following the vector control technique , the quick development of DTC makes itself a new high-powered Alternating Current(AC) driving technique paralleling to the vector control. The DTC system has many advantages such as simple realization and excellent dynamic response and perfect robustness etc.In this paper, DTC of asynchronous motor was introduced based on analyzing AC motor mathematic model, and discussed the methods to observation of flux linkage, proposed measures to improve the u-i integral model. It discussed further the limitation of traditional Bang-bang method of DTC, using 12 working vectors to describe the Voltage Vector, and discuss the product way of SVPWM in this case ,the show the models of flux estimation and speed estimation, this paper achieves the simulation and the analyses of the simulation results, using the Matlab/Simulink.In this paper,we bring fuzzy self-adaptive PI into the DTC.This ways and means having innovatetion and pratical.Based on the analyses paper designs the control system of hardware and software via the DSP chip of TMS3020LF2407A. to drive an Asynchronous Motor of 75kw,then forms an open loop control system of Motor with given speed…..finally gets better control performance. This is a good attempts of the usage of the technology of Motor control, and lies a foundation for high accuracy DTC.