Inverse-System Decoupling Control of DC/DC Converters

Yimin Lu, Haimeng Zhu, Xianfeng Huang and Robert D. Lorenz
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Yimin Lu: College of Electrical Engineering, Guangxi University, Nanning 530004, China
Haimeng Zhu: College of Electrical Engineering, Guangxi University, Nanning 530004, China
Xianfeng Huang: College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China
Robert D. Lorenz: Department of Mechanical Engineering WEMPEC, University of Wisconsin-Madison, Madison, WI 53706, USA

Energies, 2019, vol. 12, issue 1, 1-19

Abstract: Existing large-signal control schemes for DC/DC converters formulate control strategies based primarily on nonlinear control theory, and the associated design and implementation are relatively complex. In this work, a decomposition modeling and inverse-system decoupling control method is proposed for DC/DC converters that operate under large-signal disturbances. First, a large-signal circuit-averaged model for DC/DC converters is established. The proposed control system has a double closed-loop control structure composed of a voltage loop and a current loop. Then, the voltage-loop and current-loop controlled subsystems are decoupled and compensated to first-order integral elements using the inverse system method. Several linear feedback controllers are designed for first-order integral systems under various optimization criteria using the optimal control theory. Simulation and experiment were performed on buck–boost converters with resistive and constant power loads. The results show that under the control of the proposed controller, all systems exhibited excellent dynamic and steady-state performance. The proposed method allows the disturbance control of the DC/DC converter, the dynamic behavior control of the voltage loop, and the current loop to become independent processes. The local controller design follows the classical linear control design method and is a simple and effective large-signal control strategy.

Keywords: DC/DC power conversion; modeling; decoupling of systems; control systems; constant power load (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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