Implementation of a Dual-Input Single Output Synchronous Buck-Modified SEPIC Converter for DC Microgrids

• Published in: Journal of power technologies Vol. 105; no. 2; p. 125
• Main Authors: Gopal, Yatindra, Dhaked, Dheeraj Kumar, Kumari, Akanksha
• Format: Journal Article
• Language: English; Polish
• Published: Warsaw Warsaw University of Technology, Institute of Heat Engineering 01.03.2025
• Subjects: Buck converters; Distributed generation; Electric potential; Energy harvesting; Energy sources; Photovoltaic cells; Power flow; Ratios; Renewable energy; Resource utilization; Solar energy; Voltage; Voltage converters (DC to DC)
• ISSN: 2083-4187; 2083-4195

An asynchronous dual-input single output (DISO) buck-boost converter is utilized to power DC microgrids (DCMG) with hybrid energy sources, such as solar PV and battery energy harvesting systems. However, the asynchronous buck-boost DISO converter, which produces a continuous output voltage and current at duty ratios above 0.7, can suffer from voltage stress on the power switches at these higher duty ratios. Additionally, this converter provides output current discontinuously at lower duty ratios due to its low resource utilization. A new synchronous buck modified SEPIC converter (MSC) DISO converter is proposed to address these issues. This converter can generate continuous output current and voltage at a duty ratio of 0.3, making it more suitable for integrating PV-battery energy harvesting systems into DCMG. This paper presents a topological analysis of DISO converters using power flow diagrams to establish the foundational principles of the proposed synchronous buck-MSC approach. Comprehensive research and analysis of this synchronous buck-MSC DISO converter are conducted using PSIM software. The simulation results demonstrate the effectiveness of the synchronous buck-MSC DISO converter in meeting the power requirements of DCMG, thereby proving its applicability and efficiency in renewable energy-based DCMG.