Optimal control strategies for PMSM with a decoupling super twisting SMC and inductance estimation in the presence of saturation

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This paper deals with optimal control strategies robustified by a decoupling super-twisting sliding mode control (ST-SMC) for permanent magnet synchronous machines (PMSM). In general, ST-SMC is a robust method for controlling systems and guarantees asymptotic convergence in cases where the upper bound of model uncertainties such as disturbances and parametric uncertainties is not known a priori, if the upper bound of the derivative is known. The proposed optimal control strategy is designed for a constant torque reference whose control is implemented in two control regions: maximum torque per ampere (MTPA) and flux-weakening control. In the proposed analysis, the operating point of the motor can also be in the saturation region, which makes the estimation of Ld and Lq in the proposed optimization procedure of particular interest and also important for the decoupling control implemented with ST-SMC. To compensate for typical parameter variations, adaptive parameter estimation is introduced into the control system using an extended Kalman filter (EKF) in combination with a bivariate polynomial. In order to be able to make an assessment of the control performance of the ST-SMC, a comparison with a conventional PI controller is shown at the end of the paper. Measured results using hardware in the loop (HIL) to validate the results and their detailed discussion and analysis are included.
Original languageEnglish
Article number106934
JournalJournal of the Franklin Institute
Volume361
Issue number11
Number of pages30
ISSN0016-0032
DOIs
Publication statusPublished - 07.2024

Bibliographical note

Publisher Copyright:
© 2024 The Author(s)

    Research areas

  • ST-SMC, PMSM, EKF, MTPA, Kalman filter
  • Engineering

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