Energy management and peak-shaving in grid-connected photovoltaic systems integrated with battery storage

This paper focuses on the application of BESS (Battery Energy Storage Systems) in improved operation of distribution grids that are highly penetrated with PV (Photovoltaic) systems. The paper features a state-space based model for BESS and implements a simple and effective approach for peak load shaving by considering device constraints. The grid-connected PV+BESS system proposed in this work contains bidirectional DC/DC and AC/DC converters and batteries, and is capable of simultaneous control of active power, reactive power, and DC-link voltage. In this work, an energy management strategy with the goal of peak-shaving has been proposed, which also considers degradation and ageing limits of the batteries. Simulations have been performed at different battery capacity cases to show the capabilities of the proposed PV+BESS.