Reducing the residential PV-BESS size by means of an LVDC backbone: Impact on voltage unbalance and energy efficiency

A hybrid AC/DC grid, segregating the demand on the existing AC grid and the renewable production and storage on an LVDC backbone responds to the challenges faced nowadays when integrating DER on the traditional AC grid. The single point of injection by means of an LVDC backbone has a number of advantages, which are assessed in this study. Having an unbalanced AC grid with PV and storage increases the benefit of an LVDC backbone. This leads to significant savings in PV and storage, a reduction of the voltage unbalance and an improvement of the energy efficiency.