Efficient Bi-Directional DC/DC Converter with Maximum Power Point Tracking in PV Applications

This research work proposes a non-isolated bidirectional DC/DC converter (NIMBC) for enhanced battery charging and discharging efficiency in photovoltaic (PV) power systems. The goal is to minimize switching losses, overvoltage spikes suppression, and total energy efficiency improvement through enhanced circuit integration. A zero-current switching (ZCS) soft-switching (SS) circuit offers the benefit of minimizing switching losses through the delivery of minimum current at turn-on, thus decreasing heat dissipation and improve system reliability. Additionally, the RCD snubber circuit suppresses turn-off overvoltage spikes, providing a smooth and stable operation under varying operating conditions. Aside from improved circuits, the new converter boasts a better Maximum Power Point Tracking (MPPT) method that surpasses traditional ones like the Radial Basis Function Network (RBFN) and Incremental Conductance (IC). The innovative MPPT method responds effectively to sudden solar changes, achieving optimal energy harvesting and low Total Harmonic Distortion (THD) for power quality improvement. Comprehensive PSIM and MATLAB/Simulink simulations confirm system efficiency in low switching losses, maximum energy transfer, and system stability. The test demonstrates that the new converter is an efficient and effective alternative to contemporary renewable energy applications and surpasses the basic challenges of PV power management.