Analysis of the performances of electric energy storage in residential applications

Abstract

The energy generation through photovoltaic systems has recorded extremely high growth rates. In Italy, more than 500,000 PV plants have been installed which produce almost 109,5 TWh, reaching a covering 5.6% of the total energy demand. The fall in prices of technology has resulted in a sharp drop in the cost of generation photovoltaic energy, which based on current projections reach competitiveness with the energy purchased from the grid in the next future, giving rise to a possible further spread of PV plants. In recent years appeared unavoidable the need to address the issues arising from the uncontrolled growth of photovoltaic installations such as intermittent, loss of balance and predictability of the generation. A possible strategy that facilitates the integration of renewable energy is the usage of battery electric energy storage (EES), together with incentives for self-consumption or energy independence from the network. The stepwise reduction of remuneration for photovoltaic grid feed-in power in Italy, residential energy grid-interactive energy storage systems for buffering of surplus PV generation and subsequent self-consumption is a field of growing interest and market activity. The study aims to identify the energy exchange with the grid of combined PV-EEs systems dedicated to residential and small commercial photovoltaic generation plants.