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Continuous-Control-Set Model Predictive Current Control of Asymmetrical Six-Phase Drives Considering System Non-Idealities

Lookup NU author(s): Dr Sze Sing LeeORCiD

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Abstract

Finite-control-set model predictive control (FCS-MPC) of multiphase (n-phase, n is assumed to be an odd number for simplicity) drives is challenging because of the large number of actual/virtual voltage vectors and the need for current control in (n-1)/2 sub-spaces (or planes; multi-plane current control). Any sub-optimal design (poor or no current control in some of the (n-1)/2 planes) may result in high individual plane current ripples, due to the low reactance. This work therefore investigates continuous-control-set (CCS) MPC for constant switching frequency multiphase motor drives as another alternative. The high-bandwidth CCS-MPC is designed to accurately account for system non-idealities, namely digital control and pulse width modulation delays, inverter dead time, and measurement noise. It will be shown that the CCS-MPC has the advantages of full voltage vector space access, regular switching characteristic, and improved cycle-by-cycle tracking control, while maintaining some of the known advantages of the FCS-MPC, e.g., intuitive cost function design, model-based control, and fast dynamics. The proposed control scheme is benchmarked experimentally against the classical, proportional-integral-based, field-oriented control in conjunction with an asymmetrical six-phase induction motor drive.

Publication metadata

Author(s): Lim CS, Lee SS, Levi E

Publication type: Article

Publication status: Published

Journal: IEEE Transactions on Industrial Electronics

Year: 2023

Volume: 70

Issue: 8

Pages: 7615-7626

Print publication date: 01/08/2023

Online publication date: 20/09/2022

Acceptance date: 02/09/2022

ISSN (print): 0278-0046

ISSN (electronic): 1557-9948

Publisher: IEEE

URL: https://doi.org/10.1109/TIE.2022.3206703

DOI: 10.1109/TIE.2022.3206703

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