Abstract
The current paper presents a novel predictive voltage control (PVC) for an induction motor (IM) without using a speed sensor. The proposed PVC is formulated using the model predictive control principle in which the stator voltages are directly controlled rather than regulating the flux and torque as in traditional MP DTC. The advantages of the proposed PVC over the commonly used MP DTC scheme are the reduced calculation time, the reduced ripples and the fast dynamic. To realize the sensorless operation of the IM, a robust observer is used to estimate the speed, rotor flux, stator current and stator and rotor resistances. The observer is constructed based on the back-stepping theory. Testing the validness of the proposed sensorless PVC technique is performed in a form of comparison between the PVC and MP DTC procedures. The tests are firstly accomplished using the Matlab/Simulink software; then, a dSPACE 1104 test board is utilized for the experimental validation. The simulation and experimental results show that the IM dynamics are effectively enhanced when applying the proposed PVC in comparison with the MP DTC performance. The back-stepping observer (BSO) also proved its ability to estimate the specified variables for different operating speeds and under parameters variation as well.
Highlights
The predictive control (PC) approach has been considered as an appropriate choice for obtaining better dynamics from induction motor (IM) drives [1]–[6]
The performance was significantly improved using these techniques; the cost functions in these studies used parameters dependent variables such as the flux [5], [6], which made the controller very sensitive to the parameters variation
SIMULATION RESULTS In order to test the applicability of the predictive voltage control (PVC), a comparative study is organized between the performances of the MP DTC and novel PVC approaches
Summary
The predictive control (PC) approach has been considered as an appropriate choice for obtaining better dynamics from induction motor (IM) drives [1]–[6]. Value was omitted, which simplified the cost function and reduced the calculation time taken by the controller The drawback of this topology is that the precise estimation of the flux components must be ensured for all operating cases, and to fulfill this need, adaptive flux observers must be incorporated which adds extra burden to the computation time. In order to solve some of the deficiencies in the traditional MP DTC, and to ensure a robust performance from the speed estimator, the current work introduces a novel sensorless predictive voltage control (PVC) approach. The advantages of the proposed procedure are the simplicity, the fast dynamic change, the reduced ripples and low computation time These merits are obtained through using a simple error function form with terms of the same category (d-q stator voltages). The last section (Sec VIII) is concerned with introducing the research outcomes and the conclusion
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