Abstract
The study presents the direct flux and current vector control of an induction motor (IM) drive, which is a relatively newer and promising control strategy, through the use of model predictive control (MPC) techniques. The results highlight that the fast flux control nature of direct flux control strategy is further enhanced by MPC. Predictive control is applied in two of its variants, namely the finite control set and modulated MPC, and the advantages and limitations of the two are underlined. This work also highlights, through experimental results, the importance of prioritising the flux part of the cost function which is particularly significant in the case of an IM drive. The performance of the MPC-based approach is compared with the proportional–integral controller, which also prioritises the flux control loop, under various operating regions of the drive such as in the flux-weakening regime. Simulations show the performance expected with different control strategies which is then verified through experiments.
Highlights
Since the early ‘60s, the concept of model predictive control (MPC) [1,2,3,4,5] has been successfully implemented in industrial process control
This paper proposes, and experimentally validates, MPC application of direct flux vector control (DFVC) [20,21,22] of induction motor drives
The paper is arranged as follows: section II briefly describes the concept of direct flux and current vector control (DFCVC) and the state equations for the control are derived, in section III the MPC is formulated for DFCVC, section IV discusses the implementation details of MPCDFCVC, in section V simulation and experimental results for predictive DFCVC are presented, discussed and a comparison with linear controller-based approach is made, and section VI concludes the paper
Summary
Since the early ‘60s, the concept of model predictive control (MPC) [1,2,3,4,5] has been successfully implemented in industrial process control. The paper is arranged as follows: section II briefly describes the concept of direct flux and current vector control (DFCVC) and the state equations for the control are derived, in section III the MPC is formulated for DFCVC, section IV discusses the implementation details of MPCDFCVC, in section V simulation and experimental results for predictive DFCVC are presented, discussed and a comparison with linear controller-based approach is made, and section VI concludes the paper. One way to predict ids for instant k + 1, is to use the induction machine equations in rotor field-oriented frame to obtain id (k + 1) in (d, q) reference frame of Fig. 1 (a) and transform it to (ds, qs) reference frame and get ids (k + 1), this results in additional computational burden in terms of reference frame transformations of flux, current and voltage vectors.
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