Linear Quadratic Regulator Control for Multi-Port DC-DC Converter for Standalone Photovoltaic System

The purpose of this work is to propose a dependable control approach for the Voltage Regulator-Battery Energy Storage System (VR-BESS) power converter used for renewable energy sources (photovoltaic system with battery). This method considers multivariable control based the Linear Quadratic Regulator (LQR). The small signal modeling served as the foundation for the mathematical study that was carried out in this research. As a result, the matrices of the converter for the two modes of operation at input voltage source or battery voltage. The simulation was carried out using the Simulink approach provided by the MATLAB program. When compared to the traditional pole placement method, the obtained results indicate that the suggested LQR method in the VR-ESS presented high accuracy along with smooth operation and less maximum overshoot in the output voltage. This was the case as a result of the method's reduced maximum overshoot in the output voltage.