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

• Published in: International journal of circuit theory and applications Vol. 52; no. 5; pp. 2466 - 2492
• Main Authors: Dhananjaya, Mudadla, Anand, Vishal, Singh, Varsha, Pattnaik, Swapnajit, Potnuru, Devendra
• Format: Journal Article
• Language: English
• Published: Bognor Regis Wiley Subscription Services, Inc 01.05.2024
• Subjects: Capacitors; controller design; DC‐DC converters; efficiency analysis; Inductors; Inrush current; Inverters; non‐isolated high gain converter; Photovoltaic cells; photovoltaic system; Reliability analysis; Renewable energy sources; Silicon carbide; Topology; Voltage gain; voltage stress
• ISSN: 0098-9886; 1097-007X
• DOI: 10.1002/cta.3868

Summary 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‐ ϕ 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.