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Variable Switching Point Model Predictive Control for DC-Link Voltage Regulation of Back-to-Back Converters

Grimm, F; Kolahian, P; Bucknall, R; Baghdadi, M; (2022) Variable Switching Point Model Predictive Control for DC-Link Voltage Regulation of Back-to-Back Converters. IEEE Transactions on Industry Applications (In press). Green open access

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Abstract

In this paper, a novel control method for back-toback converters used in grid-to-motor connections is explored. To increase the robustness of low DC-link capacitances, a control method based on variable switching point model predictive control is proposed. While previous model predictive control methods for the back-to-back converter selected a certain switching state to fulfill all control goals, we use the switching time in addition to the switching state in order to minimise deviations from the target voltage. Choosing a variable switching point provides an additional degree of freedom to the control framework and allows the system to cope with the large number of control variables. In this case, the variable switching point is used to minimize the effects of low DC-link capacitances on the system. This can either be achieved by selecting a switching point that yields low DClink capacitor charging or by selecting a switching point that aims to keep the DC-link voltage close to the reference. The proposed method is verified through numerical simulations and hardware-in-the-loop (HIL) experiments and compared to existing approaches. The results show that it is possible to control the DClink using only the switching point of the converter.

Type: Article
Title: Variable Switching Point Model Predictive Control for DC-Link Voltage Regulation of Back-to-Back Converters
Open access status: An open access version is available from UCL Discovery
Publisher version: http://ieeexplore.ieee.org/xpl/RecentIssue.jsp/?pu...
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Back-to-back Converter, Model Predictive Control, Variable Switching Point, DC-link control, Capacitor Minimization
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/10141616
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