Design of non-isolated DC-DC converter using renewable energy source for two-stage centralized grid connected inverters

Recent research has focused on high-power two-stage photovoltaic (PV) systems, particularly with the introduction of wideband gap silicon carbide (SiC) devices. A massive inductor or interleaved boost converter is utilized in a standard two-stage system, requiring a significantly larger number of components and subsequently impacting power density. As a result, the purpose of this research is to provide a topology for a high-power non-isolated switched capacitor network-integrated boost converter (SCNIBC). This architecture employs two of every switch/diode/inductor and capacitor. The suggested architecture has a triple voltage boost at 50% duty ratio, excellent efficiency, and very low inrush current. A suitable analysis is performed to determine the voltage gain, component selection, and power loss analysis. Reliability analysis is studied as per the IEC 61709-2017 standards. A fair comparison with existing state-of-the-art high-power PV system topologies is offered. Eventually, the steady-state experimental findings for a 2.5 kW load are confirmed. The results are also validated for a step adjustment in input voltage from 80 V to 96 V. Lastly, the grid connected operation of converter is studied with a H-bridge inverter under unity, lagging and leading power factors. A new switched capacitor based non isolated DC-DC boost converter for PV application, exhibiting quadruple voltage gain is presented in this manuscript. The operation of DC-DC is further investigated with an H-bridge inverter for a 1-phi$$ \phi $$ grid-connected application along with detailed controller design. A fair comparison is done with other similar converters along with the reliability analysis of the converter as per IEC 61709-2017 standard. image