Abstract
Due to superior robustness characteristic of sliding-mode control techniques, this study proposes a multiple sliding-mode control (MSMC) strategy based on the stator flux oriented vector scheme for speed control of three-phase AC induction motor (IM) drives in the presence of an external disturbance and uncertainties. At first, the dynamic model of a three-phase IM drive is transformed into two-axe orthogonal model (i.e. d and q axes) in the synchronously rotating frame so that vector control can be applied. Then, based on the stator flux oriented scheme (i.e. zero stator flux at q-axis and constant at d-axis), the proposed MSMC causes mechanical angular speed and stator current at q-axis reach toward predefined sliding surfaces. Moreover, stator flux and current at d-axis are respectively indirect and direct controlled such that tracking errors approach toward designed sliding surfaces. The closed-loop stability of the proposed MSMC is proved to possess uniformly ultimately bounded (UUB) performance by Lyapunov stability criteria. Furthermore, the simulation results reveal that the proposed MSMC strategy has a high level of robustness despite addition of an external load and random uncertainties on system parameters. In the meantime, the simulations for comparing the baseline controller (i.e. conventional PI control) are also conducted to verify the superiority of the proposed control scheme.
Highlights
induction motor (IM) drives have widely been applied to numerous kinds of fields such as industries, traffic transportation and medical equipment etc
The results reveal that Fieldoriented control (FOC) scheme has low torque ripples and direct torque control (DTC) scheme has fast dynamic response
The contributions of this study can be summarized as follows: (1) A viable solution that is, the proposed multiple slidingmode control (MSMC), is presented for the speed control of three-phase AC IM drives (2) The proposed MSMC scheme which is hierarchically designed based on stator flux oriented vector strategy can become a standard design procedure applied to three-phase AC IM drives (3) The proposed control demonstrates the superior performance to a conventional PI control and possesses a high level of robustness despite addition of an external load and random uncertainties on system parameters
Summary
IM drives have widely been applied to numerous kinds of fields such as industries, traffic transportation and medical equipment etc. To the best of our knowledge, a multiple sliding-mode control (MSMC) strategy[12,13] based on the stator flux oriented vector scheme is firstly proposed for control of IM drives and can effectively deal with the IM drives in spite of suffering an external load and random uncertainties.
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