Document Type : Review Paper
Authors
1 Department of Electrical Engineering, Faculty of Engineering, Golestan University, Gorgan, Iran
2 Faculty of Electrical Engineering, Shahrood University of Technology, Shahrood, Iran
Abstract
Previous studies have introduced a novel multi-input DC/DC converter with a coupled inductor to overcome the low output-voltage level of renewable energy sources (RESs), such as photovoltaic arrays (PVAs) and fuel cells. The converter provides a wide output-voltage range and effective power management at relatively low duty ratios. However, because the converter dynamics vary with uncertainties in component values, input voltages, and output load, its stability must be evaluated over a range of operating conditions. In this study, an uncertainty model is employed to describe the small-signal dynamics of the proposed converter and to assess its robust stability. Kharitonov's theorem is then applied to establish a sufficient robust-stability condition. To support the stability assessment, a Monte Carlo analysis is used to determine the extreme values of the characteristic-polynomial coefficients under simultaneous component and load variations. The results show that all four Kharitonov polynomials satisfy the Routh stability criterion, demonstrating that the proposed converter remains stable over the considered uncertainty range. The approach therefore provides a practical and optimized framework for robust stability assessment of multi-input power converters intended for renewable-energy applications.
Keywords
- renewable energy source
- multi-input converter
- robust stability analysis
- Kharitonov's theorem
- optimized converter design
Main Subjects
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