Evaluating Reliability: A Comparative Analysis of Two High Gain DC to DC Converters in Solar Photovoltaic Applications

DC micro grids are optimisable solution for bounded energy distribution due to their high reliability and efficiency. In Solar Photo-voltaic systems(SP-VS) based DC microgrids, High Gain Step-up DC to DC Converters (HGSDDC) are essential for effectively regulating energy transfer. They are intended to convert 20-40v dc to 380-400v dc with maximum efficiency with low input ripple current. To obtain high gain, several topologies have been proposed based on voltage multiplier circuits, coupled inductor circuits, and voltage lift methods or with their combinations. Reliability of these converters affect sustainability of the entire DC micro grid system. Component level thermal performance can be used to rate the reliability of a converter. In this paper, we delve into the thermal performance and reliability assessment of two recently proposed HGSDDCs. These converters have garnered attention due to their high gain and efficiency. Modelling and simulation is performed using PLECS. The simulation results demonstrate the high reliability of coupled inductor(CI) based HGSDDC2. The only negative aspect of this converter is the high reverse voltage of its output diode. Reducing the high voltage stress on diodes will significantly increase converter life and, consequently, system reliability.

I. Introduction

The integration of renewable energy resources becomes critical in light of the global energy problem. These sources not only mitigate pollution but also have a negligible environmental impact. An essential part of solving the world’s energy dilemma is utilizing renewable energy sources. SP-VS occupy a prominent position among renewable energy sources due to several compelling factors. It is most abundant and absolutely free of cost. SP-VS delivers low level DC voltages and needs to be elevated using HGSDDC. When selecting a converter for SP-VS applications, several essential criteria come into play. High efficiency, high reliability, low input ripple, maximum power point tracking (MPPT) compatibility are some key considerations. Because of their many advantages over isolated HGSDDCs, including their compact size, low cost, great efficiency, and simpler control mechanisms, non-isolated HGSDDCs are frequently used.