Assessing Variable Sampling Time Controllers for Five-Phase Induction Motor Drives

• Published in: IEEE transactions on industrial electronics (1982) Vol. 67; no. 4; pp. 2523 - 2531
• Main Authors: Arahal, Manuel R., Martin, Cristina, Barrero, Federico, Duran, Mario J.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-04-2020; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Controllers; Discrete-time control; Induction motor drives; Induction motors; Lead; model-based control; Modulation; multiphase drives; Observers; Performance prediction; Performance tests; Power converters; Predictive control; Pulse width modulation; Rotors; Sampling; Stators; Switches
• ISSN: 0278-0046; 1557-9948
• DOI: 10.1109/TIE.2019.2908585

Finite control set predictive controllers perform a direct digital control of power converters without a modulation stage such as pulsewidth modulation. Opposed to the inherent positive traits such as high flexibility and enhanced bandwidth, an increase in harmonic content is usually reported. The concept of variable sampling time (VST) has been recently introduced as a means to alleviate the harmonic content. The nonuniform sampling approach can be seen as an extra degree of freedom that is conferred to the controller, keeping its model-based feature. This paper goes beyond the state-of-the-art of VST controllers, introducing a new scheme for the computation of the sampling time. The resulting VST controller is experimentally assessed for a two-level five-phase induction motor drive, where steady-state and dynamic performance tests confirm the interest of the proposal.