The Topologies of Multi-Input Single-Output Isolation-Free DC-DC Convertor for Hybrid Power Plants

Abstract

Today it is an obvious fact that energy consumption tends to increase due to technological developments, population growth, and increasing living standards. In last two decades, renewable energy sources are considered to be the most convenient way to produce clean energy, as it has infinite energy potential. However, most of these alternative systems are not considered sufficient to supply the whole demand alone. But hybrid systems with some alternative energy sources, such as solar, wind, and biomass appear to be a solution to supply the energy needs in the future. In hybrid systems, the DC-DC converter structure is the main device when converting energy for the proper loads. Single/multiple inputs, single/multiple output DC-DC converter topologies vary in design according to the energy demand of the load. Particularly, as the power flow direction differs depending on the energy need and efficiency in energy systems, the usage areas of topologies with bidirectional power flow and fewer circuit elements that reduce system cost and complexity are expanding. In this study, the simulation of multi-input single-output (MISO) DC-DC converter topologies were performed in Matlab / Simulink software. Inductor current and voltage, output current and voltage, as well as output power used in the determining topologies were analyzed. The mathematical equations given in the topologies were confirmed by simulation studies.