Research Of Direct Torque Control Based On ADI Semi-Physical Dynamic Simulation Platform For Induction Motor

Electric motor is the common electrical equipment in the production of modern industry. With the increase in applications and the number of motor, the accurate control of electric motor running state appears particularly important. Compared with Vector Control technology, Direct Torque Control technology is simpler in principle, easier to master and less affected by changes in parameters. Under domestic and foreign scholars’ painstaking research, it has already made a breakthrough in the theoretical study and practical application of Direct Torque Control. But it still has big promotion space in the low-speed performance and overall application performance. This paper researches on DTC technology for induction motor, the main work is as follows:1. The mathematical model of induction motor and three-phase invertor are studied, and the DTC basic theory is described mathematically.2. The hexagon flux linkage DTC and SVM-DTC are introduced. Based on the simulation software Matlab/Simulink, their models are built.3. Based on the analysis of simulation results, optimization is made and a new DTC model is established. New model adopts two strategies in low and high speed region and a switching link is added.4. Experiment platform of DTC for induction motor is built based on the semi physical dynamic simulation (ADI) platform. Tests on new model are carried out.The simulation and test results show that proposed scheme improves the dynamic performance and low speed performance of induction motor DTC system. The new DTC system has better low-speed performance, lower switching frequency and less switching loss.