PV module-integrated single-switch DC/DC converter for PV energy harvest with battery charge capability

This paper proposes a novel PV module integrated system with energy storage capability. The topology is based on the Future Renewable Electric Energy Delivery and Management (FREEDM) System, where Distributed Renewable Energy Resources (DRER) comprised by a single power stage, are responsible for the Maximum Power Point Tracking (MPPT) of each PV module and also the charging method of a centralized battery pack. Due to the characteristics of the PV module and the DC-bus, the single power stage must provide low current ripple in the input and output terminals, must operate with output current and voltage regulation and present a high voltage conversion ratio. To achieve such features, this paper proposes a novel boost-Zeta integrated converter. The analysis of the operation of this converter is carried out in details. The MPPT algorithm and the charging method are discussed in detail. The DC-DC converter is designed to ensure low ripple and limited charging current, as well as voltage regulation when the batteries are fully charged. In this version of the paper, simulation results are presented for the converters confirming the theoretical analysis. In final version of the paper, experimental results will be presented.