| AC variable speed system because of the system itself nonlinear, complex and changing motor parameters and other factors will affect the control performance, in order to overcome these effects and improve system performance, using a variety of complementary advantages of smart technology into the present study hot spots.This paper first introduces the AC drive system development course and the significance of the research, and then according to the present speed some problems led to vector control basic idea. The second chapter tells the motor speed is the key to what, how to get like AC motor DC motor as control effect, then introduce the basic theory of the vector control and asynchronous motor in each coordinate vector transformation, for the construction of SVPWM vector control system platform provides a theoretical basis.Then study of sliding mode variable structure control design problem, it is mainly directed against the comparison between traditional PI or PID to found their shortcomings and design, and the system can make up for the lack of controller but there will be some new issues such as the buffeting. In response to the presence of buffeting and how to improve the robustness of the system and other issues, a fuzzy sliding mode variable structure design. Then introduced the use of sliding mode observer for speed identification of the speed sensor less vector control system, at the same time the observer estimated speed were deduced, the two-phase stationary coordinate system reference model and adjustable model was defined, and identified the system into the equivalent velocity of sliding mode control. Then in MATLAB/Simulink environment simulation and analysis of the results. Finally, this paper regards TMS320LF2407as the control core of the experimental platform and experimental, experimental results show that the method based on sliding mode variable structure of the asynchronous motor of high performance control system research is effective, reasonable. |
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