Novel high-boost DC–DC converter structures tailored for parallel solar power optimizer operation

This paper introduces a new class of high-voltage-gain DC–DC converter topologies specifically designed for parallel solar power optimizer (SPO) structures in photovoltaic (PV) systems. The proposed designs combine an enhanced switched-inductor (SI) network with a compact voltage-multiplier cell (VMC), enabling continuous input current, significantly reduced semiconductor voltage stress, and a wide voltage conversion range suitable for high-voltage DC-bus architectures. Unlike existing isolated and non-isolated high-gain converters, the presented configurations achieve higher efficiency and lower conduction losses while using fewer components through an optimized capacitor-stacking and SI integration mechanism. A representative topology from the proposed family is analyzed through detailed steady-state modeling, non-ideal component considerations, and comprehensive loss evaluation. MATLAB/Simulink simulations under variable irradiance and load conditions demonstrate robust dynamic performance and stable operation. A dedicated input-voltage regulation loop ensures fast and accurate maximum power point tracking (MPPT). Experimental validation with two 100-W laboratory prototypes confirms the analytical predictions, achieving quadratic-like voltage gains of 6 and 8 at 50% duty cycle, demonstrating the effectiveness and practical applicability of the proposed converter architecture for SPO-based PV systems. • New high-gain DC–DC topology with integrated SI–VMC for SPO PV systems. • Achieves quadratic voltage gain with reduced semiconductor stress. • Delivers continuous input current and strong PV dynamic compatibility. • Prototype tests show gain of 8 at D= 0.5 with peak efficiency of 97%. • Offers high gain-to-component ratio and improved performance vs. existing designs.