Robust LMI-LQR Control for Dual-Active-Bridge DC-DC Converters with High Parameter Uncertainties

Peizhou Xia; Haochen Shi; Huiqing Wen; Qinglei Bu; Yihua Hu; Yong Yang

doi:10.1109/TTE.2020.2975313

Robust LMI-LQR Control for Dual-Active-Bridge DC-DC Converters with High Parameter Uncertainties

Peizhou Xia^*, Haochen Shi, Huiqing Wen, Qinglei Bu, Yihua Hu, Yong Yang

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

47 Citations (Scopus)

Abstract

This article presents an improved linear-quadratic regulator (LQR) control based on linear matrix inequalities (LMIs) to optimize the key parameters for the closed-loop control of dual-active-bridge (DAB) converters with high system uncertainty. First, the polytopic model of an uncertain DAB converter is introduced according to the simplified DAB equivalent circuit. LMIs are then used in the improved LQR control to derive the optimized control parameters under the given constraints. An improved LMI-LQR hybrid closed-loop control is adopted with the output current introduced in the control loop to enhance the dynamic performance. The performance of the proposed LMI-LQR is compared with the conventional LQR in terms of transient responses under various load and line disturbances. Both the simulation and experimental results are provided to validate the advantages of the proposed control.

Original language	English
Article number	9004510
Pages (from-to)	131-145
Number of pages	15
Journal	IEEE Transactions on Transportation Electrification
Volume	6
Issue number	1
DOIs	https://doi.org/10.1109/TTE.2020.2975313
Publication status	Published - Mar 2020

Keywords

Dual-active-bridge (DAB) dc-dc converter
dynamics
linear-quadratic regulator (LQR) control
robustness

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10.1109/TTE.2020.2975313

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abstract = "This article presents an improved linear-quadratic regulator (LQR) control based on linear matrix inequalities (LMIs) to optimize the key parameters for the closed-loop control of dual-active-bridge (DAB) converters with high system uncertainty. First, the polytopic model of an uncertain DAB converter is introduced according to the simplified DAB equivalent circuit. LMIs are then used in the improved LQR control to derive the optimized control parameters under the given constraints. An improved LMI-LQR hybrid closed-loop control is adopted with the output current introduced in the control loop to enhance the dynamic performance. The performance of the proposed LMI-LQR is compared with the conventional LQR in terms of transient responses under various load and line disturbances. Both the simulation and experimental results are provided to validate the advantages of the proposed control.",

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AU - Hu, Yihua

AU - Yang, Yong

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Robust LMI-LQR Control for Dual-Active-Bridge DC-DC Converters with High Parameter Uncertainties

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Keywords

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