Abstract
In this manuscript, the high-accuracy stator currents tracking issue is considered for a six-phase induction motor subject to external perturbations and uncertainties due to unmeasurable rotor currents and electrical parameter variations. To achieve the control goals, the common two-cascade controllers structure is required for this type of motor. The first controller in the outer loop consists of a proportional integral to regulate the speed. Then, the second is the proposed inner nonlinear stator currents controller based on a robust discrete-time terminal super-twisting algorithm supported by the time-delay estimation method. For the design procedure, the discrete-time stator currents dynamics are derived; for example, the vector of the matched perturbations and unmeasurable rotor currents are specified to simplify the estimation. A detailed stability analysis of the closed-loop error dynamics using Lyapunov theory is given. Finally, a real asymmetrical six-phase induction motor is used to implement in real-time the developed method and to illustrate its effectiveness and robustness. The results obtained reveal a satisfactory stator currents tracking in steady state and transient conditions and under variation in the magnetizing inductance. Moreover, a comparative study with an existing method in steady state for two different rotor speeds is presented to show the superiority of the proposed discrete-time technique.
Highlights
Published: 1 March 2021Nowadays, multiphase motor drives are extensively utilized in several real-life systems such as wind turbines [1], electric vehicles [2], ship propulsion system [3], and traction system for elevators [4] and others that have aroused a significant interest among the community of automation engineers and researchers to develop advanced nonlinear control techniques ensuring high-accurate stator currents tracking [5,6]
The proposed Discrete-time Terminal Super-Twisting Control (DTSTC) combined with the Time-Delay Estimation (TDE) are implemented in real-time on a real asymmetrical six-phase IM to support the theoretical developments, to improve the performance, and to demonstrate that it is appropriate for multiphase IM stator current control
The developed DTSTC supported by the TDE method was implemented in real-time to validate its performance
Summary
Multiphase motor drives are extensively utilized in several real-life systems such as wind turbines [1], electric vehicles [2], ship propulsion system [3], and traction system for elevators [4] and others that have aroused a significant interest among the community of automation engineers and researchers to develop advanced nonlinear control techniques ensuring high-accurate stator currents tracking [5,6]. To enhance the DQSM performance and to reduce the Quasi Sliding Mode Band (QSMB), a combination of the Time-Delay Estimation (TDE) method with DQSM based on exponential reaching law has been proposed for an asymmetrical six-phase Induction. The proposed Discrete-time Terminal Super-Twisting Control (DTSTC) combined with the TDE are implemented in real-time on a real asymmetrical six-phase IM to support the theoretical developments, to improve the performance, and to demonstrate that it is appropriate for multiphase IM stator current control.
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