Extended Kalman Filter Based Control of Coupled Inductor Buck-Boost Converter for Grid Connected System

This study introduces a Photovoltaic (PV) based sophisticated control approach for a Coupled Inductor Buck-Boost Converter (CIBBC) for grid tied system. As the main renewable energy source, PV module uses the CIBBC topology to efficiently boost up the DC-link voltage in the face of varying solar irradiation with better efficiency. By dynamically estimating and compensating for nonlinearities and unmodeled disturbances in the converter operation, Extended Kalman Filter (EKF) based controller improves voltage regulation and the grid's power quality. Additionally, a battery energy storage system (BESS) with a bidirectional converter interface is included to guarantee grid side flexibility and energy reliability. For power balancing and grid support tasks, this system makes charging and discharging smooth. In order to ensure high-efficiency energy conversion, robust transient response and intelligent energy management, the proposed structure permits coordinated power flow between the PV, converter, battery and grid. The EKF-controlled CIBBC's improved dynamic and steady-state performance is validated by MATLAB/simulation, and its results attained a minimized Total Harmonic Distortion (THD) of 0.59% and the highest State of Charge (SOC) of 80%, proving its feasibility for applications in the next generation of sustainable energy needs.