Abstract
The low-voltage direct current (LVDC) system offers some advantages compared to the classical low-voltage alternative current (LVAC) system. Low-voltage direct current has fewer power conversion stages, renewable energy source compatibility, and easier battery integration. This paper compares the proposed low-voltage direct current supply concept with existing traditional photovoltaic systems regarding energy efficiency. The proposed Photovoltaic system implemented in the LTspice simulation tool is presented. The results obtained from this study revealed that using the on-grid direct current nanogrid system supply concept is very interesting if the PV-generated electricity is used locally in homes during day hours instead of injecting it into the grid. To achieve a high system efficiency, the installed photovoltaic power in houses should be accurately sized regarding the power consumption. The shorted path taken by the photovoltaic generated energy to feed load during day hours is the main advantage of the proposed low-voltage direct current architecture. The new nanogrid architecture registered efficiency can be 6% higher than conventional direct current nanogrid efficiency and 20% higher than low-voltage alternative current supplies in homes applications.