Economic and efficiency analysis of a new converter topology for multifunctional AC/DC hybrid grids

Abstract

The paradigm of smart grids has launched a precedent on the methods used to develop the new electrical power grids, related to their efficiency and overall cost. With that assessment in mind, this paper proposes an overhaul on the typical topologies related to the power electronics converters that are used to connect key technologies within a smart grid (i.e., a renewable and an energy storage system). Instead of the usual configuration, in which there is a set of power electronics converters for every technology connected to the AC power grid, it is suggested the use of a single power electronics converter (i.e., an AC/DC) to connect all the modules within the power grid and multiple DC/DC power electronics converters to connected native DC technologies, creating a DC-link and, consequently, a hybrid AC/DC power grid. This configuration aims to reduce the overall power consumption throughout the system, as well as to decrease the financial cost of the operation. Along the paper, the total cost of components will be compared between the two structures, as well as the efficiency of the system. The new topology proposed is presented, along with all the features and main differences that it includes, when compared to the traditional topology. Additionally, the main costs associated with assembling the proposed topology are estimated, as well as the demonstration of relevant comparisons between the new topology and the one already presented on the market.