Model Predictive Control for DC-DC Boost Converters with Reduced-Prediction Horizon and Constant Switching Frequency

Cheng, L, ACUNA, P, Aguilera, R, Jiang, J, Wei, S, Fletcher, J and Lu, D 2018, 'Model Predictive Control for DC-DC Boost Converters with Reduced-Prediction Horizon and Constant Switching Frequency', IEEE Transactions on Power Electronics, vol. 33, no. 10, pp. 9064-9075.


Document type: Journal Article
Collection: Journal Articles

Title Model Predictive Control for DC-DC Boost Converters with Reduced-Prediction Horizon and Constant Switching Frequency
Author(s) Cheng, L
ACUNA, P
Aguilera, R
Jiang, J
Wei, S
Fletcher, J
Lu, D
Year 2018
Journal name IEEE Transactions on Power Electronics
Volume number 33
Issue number 10
Start page 9064
End page 9075
Total pages 12
Publisher IEEE
Abstract The implementation of multistep direct model predictive control (MPC) for DC-DC boost converters overcomes the well-known issue of nonminimum phase behavior. However, it can lead to a high computational burden depending on the prediction horizon length. In this paper, a simple and computationally efficient MPC method for DC-DC boost converters is proposed. The key novelty of the presented control strategy lies in the way dynamic references are handled. The control strategy is capable of providing suitable references for the inductor current and the output voltage, without requiring additional control loops. Moreover, this reference design allows the predictive controller to be implemented with a single-step prediction horizon. Thus, a significant reduction in the required real-time calculations executed in the control hardware is achieved. To obtain constant switching frequency, the power switch commutation instants within a sampling period are considered as control inputs. Therefore, the predictive controller is formulated as a continuous control set MPC. Additionally, the proposed formulation is able to deal with different operation modes of the converter without changing the controller structure. Finally, an observer is used to dynamically modify the reference to provide robustness to system parameter uncertainties. Simulation and experimental results show an accurate tracking of dynamic inductor current and output voltage references, while respecting the restrictions on maximum inductor current levels of the converter.
Subject Electrical and Electronic Engineering not elsewhere classified
Keyword(s) Control
converters
DC-DC power conversion
modeling
predictive control
DOI - identifier 10.1109/TPEL.2017.2785255
Copyright notice © 2017 IEEE
ISSN 0885-8993
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