DISO Interleaved Buck Converter with PV-Wind Sources for 2nd-Life Li-Ion Battery Charging

This paper presents and validates a Dual-Input Single-Output Interleaved Buck Converter (DISO-IBC) for PV–Wind integration and CC/CV charging of second-life lithium-ion batteries. The topology preserves direct power paths and reduces component count; 180 \(^{\circ }\) interleaving at each input port shifts the ripple to an effective frequency close to \(2f_s\) and attenuates output ripple, enabling smaller inductors and capacitors and lower thermal/EMI stress. The control combines per-port MPPT with a supervisory power-flow manager (PFM) that allocates power according to source availability while enforcing battery current and voltage limits and thermal derating. A 600 W prototype (battery bus nominal 15 V, 40 A limit) corroborates the approach, showing measurable ripple reduction and efficiency improvement over a single-phase reference, with bus stability and consistent current sharing. Analytical, simulation, and bench results support that the DISO-IBC + MPPT + PFM integration is an effective and compact alternative for charging interfaces in PV–Wind hybrid microgrids with second-life lithium-ion batteries.