This paper proposes an optimized Linear Quadratic Regulator (LQR) based control scheme for a modified Cuk-SEPIC dual-input DC-DC converter fed by hybrid photovoltaic (PV) and wind energy sources, specifically designed for supplying regulated DC power to off-grid telecommunication loads in remote areas. The converter topology combines the advantages of the Cuk and SEPIC structures, ensuring a continuous input current, a wide operating range, and an improved voltage gain, which makes it ideal for PV-wind systems experiencing variable input conditions. A dynamic state-space model of this hybrid system is developed, incorporating system states such as the inductor current and the output voltage. The LQR controller is synthesized for minimizing a quadratic cost function that penalizes both the output voltage deviations and the excessive control effort. The optimal selection of the state and input weighting matrices enables a robust response under varying solar irradiance and wind speed conditions and load disturbances. The simulation results demonstrate that the proposed LQR-controlled system achieves a fast voltage regulation, with a minimal overshoot and a strong resilience against input and load variations, which makes it suitable for powering remote, off-grid telecommunication base stations and communication nodes where power reliability is critical.
Hybrid solar-wind sources, Modified Cuk-SEPIC converter, Linear Quadratic Regulator, MATLAB/Simulink.
Aruna RAJENDRAN, Raja JAYAMANI, Moorthi KIRUBAN, "Optimized LQR Control for Dual-Input Boost Converter in Hybrid PV-Wind System for Remote Telephony Applications", Studies in Informatics and Control, ISSN 1220-1766, vol. 34(4), pp. 53-62, 2025. https://doi.org/10.24846/v34i4y202505
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