  Distributed Generation (DG) is an effective way of integrating renewable
energy sources to conventional power grid, which improves the reliability and
efficiency of power systems. Photovoltaic (PV) systems are ideal DGs thanks to
their attractive benefits, such as availability of solar energy and low
installation costs. Battery groups are used in PV systems to balance the power
flows and eliminate power fluctuations due to change of operating condition,
e.g., irradiance and temperature variation. In an attempt to effectively manage
the power flows, this paper presents a novel power control and management
system for grid-connected PV-Battery systems. The proposed system realizes the
maximum power point tracking (MPPT) of the PV panels, stabilization of the DC
bus voltage for load plug-and-play access, balance among the power flows, and
quick response of both active and reactive power demands.
