Emulation Of Direct Self Control Of Asynchronous Machine With MATLAB

The flux and torque of stator of asynchronous machine are directly tracked, calculated and controlled in the stator-oriented coordinates, using the method of Park vector. The signal of PWM is built by dint of the discrete band-band adjustment in order to control optimally the state of the switches of inverter and get the optimal system's dynamic and static response.In the scheme of making the track of stator flux approximate circle, the relevant vector of inverter switch is selected by calculating in real time the error of torque and flux and linking the dimensional position of stator flux. In order to observe the round track of flux better and more directly and know the trait and the effect got by DSC, the emulational model with the soft of MATLAB/SIMULINK was set up by using the method of the round flux in this thesis.In the process of analyzing and designing the model of calculating the torque and flux, a few kinds of models were compared. Finally, the U-I model was designed based on synthesizing the virtue of a few models. In view of the importance of the torque in the practice of motor-control, the strategy of giving the torque priority was chosen and the three-band adjustor was designed besides choosing the appropriate Park vector of voltage.According to the result of the emulation, the model designed in the thesis was proved correct, and the result is satisfying.