Discrete Terminal Super-Twisting Current Control of a Six-Phase Induction Motor

Yassine Kali, Maarouf Saad, Jesus Doval-Gandoy and Jorge Rodas
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Yassine Kali: Power Electronics and Industrial Control Research Group (GRÉPCI), École de Technologie Supérieure, Montreal, QC H3C 1K3, Canada
Maarouf Saad: Power Electronics and Industrial Control Research Group (GRÉPCI), École de Technologie Supérieure, Montreal, QC H3C 1K3, Canada
Jesus Doval-Gandoy: Applied Power Electronics Technology Research Group (APET), Universidad de Vigo, Lagoas Marcosende, 36310 Vigo, Spain
Jorge Rodas: Laboratory of Power and Control Systems (LSPyC), Facultad de Ingeniería, Universidad Nacional de Asunción, Luque 2060, Paraguay

Energies, 2021, vol. 14, issue 5, 1-14

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.

Keywords: discrete-time current control; Lyapunov; multiphase induction motor; super-twisting control; terminal sliding mode; field oriented control (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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