Stability Analysis of Single Prediction Horizon Continuous-Control-Set Model-Predictive-Control of Buck Converter with Voltage and Current Control

Harisyam, PV and Nandanwar, A and Basu, K (2023) Stability Analysis of Single Prediction Horizon Continuous-Control-Set Model-Predictive-Control of Buck Converter with Voltage and Current Control. In: 2023 11th National Power Electronics Conference, NPEC 2023, 14-12-2023 to 16-12-2023.

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Abstract

This paper focuses on implementing Model Predictive Control (MPC) for buck converters. MPC has been increasingly adopted due to its superior dynamic performance in controlling linear and non-linear plants compared to classical frequency domain controllers. However, ensuring stability while maintaining high response speeds presents a significant challenge to the control designer. Specifically, for higher order systems with more than one state variable, attempting to increase the speed of response solely by considering the output variable can lead to limit cycle oscillations. This phenomenon has been reported for buck converters where inductor current can have limit cycle oscillation, when the output voltage is controlled. To address this challenge, this paper proposes a continuous control set MPC (CCS-MPC) algorithm with a cost function considering both state variables. This novel control algorithm uses a weighing factor to control both state variables, inductor current and capacitor voltage. This weighing factor is determined based on stability analysis, and its variation is also investigated. The proposed solution provides superior dynamic performance compared to classical controllers and superior dynamic and steady state performance compared to dead beat voltage control of buck converter with single prediction horizon. Simulation and experimental setups are used to verify the proposed algorithm's effectiveness. © 2023 IEEE.

Item Type:	Conference Proceedings
Publication:	2023 11th National Power Electronics Conference, NPEC 2023
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	The copyright for this article belongs toInstitute of Electrical and Electronics Engineers Inc.
Keywords:	Controllers; Cost functions; DC-DC converters; Frequency domain analysis; Predictive control systems; Stability; Weighing, Buck converters; Continuous control; Continuous control set model predictive control; Continuous control set MPC; Control set; Deadbeat control; Model-predictive control; Set models; Stability analyze, Model predictive control
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	03 Mar 2024 10:07
Last Modified:	03 Mar 2024 10:07
URI:	https://eprints.iisc.ac.in/id/eprint/84229

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