In the field of photovoltaic systems, the focus remains on the problem of increasing the energy conversion efficiency by reaching the maximum power output and optimizing the overall system performance while trying to reduce losses and costs in order to obtain a reliable and sustainable source of renewable energy. This paper proposes a control strategy for a DC-DC buck-boost converter integrated into a photovoltaic plant, utilizing an Advanced Linear Quadratic Regulator (LQR) approach enhanced with integral action. The proposed regulator is aimed to optimise the converter’s performance and to ensure its stable operation under the influence of varying environmental conditions. The main challenge addressed by this paper is to keep the output voltage at a required setpoint, independent of the input voltage variations and/or the system dynamics. With an improved transient response and an incorporated integral action, the proposed regulator is confirmed to be effective in ensuring Maximum Power Point Tracking (MPPT) in a photovoltaic system. The results of the simulations reflect the efficiency of the recommended LQR-based control approach in achieving an optimal voltage regulation by providing a reliable and efficient solution for converters integrated into solar tracking systems.
DC-DC buck-boost converter, Integral action, Optimal control, Photovoltaic system, Voltage regulation.
Daniel-Marian BĂNCILĂ, Ștefania-Cristiana COLBU, Dumitru POPESCU, "Advanced Optimal Control Design for a Buck-Boost Converter in Photovoltaic Systems", Studies in Informatics and Control, ISSN 1220-1766, vol. 34(2), pp. 5-14, 2025. https://doi.org/10.24846/v34i2y202501
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