Efficiency Performances of LVDC Supplies for Residential Building

Abstract

The Low Voltage Direct Current (LVDC) architecture gives higher benefits over the classic low-voltage alternating current (LVAC) supply concept. LVDC has fewer energy conversion stages, is compatible with renewable energy sources, and is easier to integrate with accumulators. In this paper, an LVDC supply concept is proposed and compared with currently used conventional photovoltaic (PV) systems in terms of efficiency. The new LVDC photovoltaic system behavior is validated using LTspice modeling tool. The findings of this work prove that the concept of LVDC supply is highly attractive when the electricity produced by the photovoltaic is used onsite in the daytime. To carry out an efficient system, the PV power mounted in the houses should be precisely rated with respect to the magnitude of the load energy consumption. We proposed three house examples to verify the superiority of our proposed system in comparison with the traditional LVDC PV chain. An annual analysis of the energy saved by the studied systems was carried out. The main benefit of the suggested LVDC supply is the short way taken by the energy generated by the photovoltaic system to supply DC loads within daytime hours. The registered increase in system efficiency reached more than 20% for the proposed LVDC system.