Abstract
The paper is concerned with the structural scheme model of the asynchronous motor vector control system with frequency control of the speed in which the coordinate conversion is carried out. A virtual model of an asynchronous motor from the Simulink Matlab library is used. The engine power is carried out from the frequency converter with a DC link with a pulse modulation. The speed control system is constructed using the principles of subordinate control of the electric drive coordinates. To analyze the operation of electric drives with vector control, a structural modeling method is adopted. The advantage of the presented model is making use of virtual models of asynchronous motors from the Simulink library. This significantly simplifies the modeling process and presents great opportunities for researchers. In this case, during the study of electric drives, it is only necessary to specify the main parameters of the motor under study. It is possible to take into account the magnetization curve of electrical steel. To measure the motor variables, a special unit is provided in which a large number of electrical machine variables can be displayed. The consideration of the motor along such a model leads to a structural diagram of the motor without simplifications, which are often entered when compensating cross-links through the channels of flow control channels and the moment. Blocks are created in which the three-phase stator current system is transformed into a two-phase system in a fixed coordinate system. This two-phase system is then converted into a two-phase coordinate system rotating with the speed of the stator field with the orientation of the real axis according to the rotor stream vector. The output coordinates of this block are used as feedback signals on the constituent stator current, proportional to the stream and the electromagnetic torque of the engine. A system of subordinate control of the coordinates of the electric drive coordinate for speed control is created. The output of this regulatory system is the voltage reference signals presented in a two-phase coordinate system rotating with the speed of the engine field. These signals are converted to a two-phase immobile coordinate system, and then into a three-phase system of the specifying signals for the frequency converter. The presented structure of the AC electric drive model gives significant opportunities to researchers when analyzing the operation of alternating current.
Keywords
Asynchronous motor, vector control, frequency converter, fixed and rotating coordinate system, structural modeling, subordinate coordinate control, latitudinal and pulse modulation.
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