| The thesis researches on induction motor based on diode-clamped three-level inverter's topology theoretically analysing the vector control algorithm of stator flux orientation, and then has a deeply analysis and researches for the above algorithm through matlab simulations and experiments.Firstly, the thesis introduces the topology of diode-clamped three-level inverter and the theory of three-level SVPWM algorithm analysing the switching states and switching vectors of the inverter. According to the position of the target vectors and different size distributions, the thesis selects different vectors to calculate the vectors' action time and introduces the coordinates of 60 degrees simple the three-level SVPWM algorithm. The three-level SVPWM algorithm is verified by using Matlab/Simulink. After that, a brief description for the control theory of asynchronous motor is provided. The mathematical model of induction motor in different coordinate systems is introduced focused on the analysis of the principle of vector control based on stator flux orientation. The thesis introduces the principle of three-level inverter voltage reconstruction and the effects of inverter output voltage reconstruction with dead zone. Basing on these, a new strategy of dead zone to reduce the effects of the voltage with dead zone is proposed, and the simulation of Matlab / Simulink is done for new strategy of dead zone. After that, the control system's simulation model based on stator flux orientation has been set up by using Matlab/Simulink. Furthermore, the simulation results show that the vector control system has a good dynamic response and steady state accuracy.Finally, the thesis designs the hardware circuit of the three-level inverter control system, which uses TMS320F28335 and EPM570 as the control core, and verifies the above algorithm based on the three-level inverter experimental platform. Experimental results show that the system has good dynamic response performance. |
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