| Citation: | ZHAO Y Y，WANG B C，HUANG T S，et al. Model predictive control strategy for Buck-Boost converter of near-space aircraft[J]. Journal of Beijing University of Aeronautics and Astronautics，2025，51（8）：2820-2828 （in Chinese） doi: 10.13700/j.bh.1001-5965.2024.0860
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The energy system of a near-space long-endurance aircraft mainly includes solar cells, energy storage batteries, energy controllers, and power distributors. The solar cells’ maximum power point tracking and energy storage battery charging are handled by the energy controller. The single boost or single buck topologies used by conventional energy controllers for near-space vehicles have multiple disadvantages. To address these issues, a four-switch Buck-Boost converter topology and a corresponding control method are proposed. Through practical power supply designs of the four-switch Buck-Boost converter, this control approach seeks to address the issue of frequent mode switching brought on by the control dead zone. A combined control strategy of model predictive control (MPC) and the multi-step discretization method is proposed. Based on the traditional Buck and Boost two-mode operation, this strategy derives the duty cycle control from the predictive model and incorporates the limit duty cycle using the multi-step discretization method. As a result, two extended modes—extended Buck (E-Buck) and extended Boost (E-Boost) are defined within the dead zone. Additionally, an input voltage detection unit is employed to achieve smooth transitions between the four modes. Through simulation trials, the suggested control strategy’s efficacy was confirmed.
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