Island unit for a power system with a control unit for controlling an energy flow between the power generation unit, the energy storage unit, the load unit and / or the power grid

The invention relates to an energy control device for a power grid and a method for controlling an operation of a power control device. In order to enable a tailored and optimized supply means connected to the power control device load unit, a power control device is proposed according to the invention, comprising: a power generation unit, in particular a photovoltaic device, for generating energy from renewable resources, an energy storage unit for storing energy, a load connecting unit for connecting the power control apparatus with a load unit for consuming energy, a power supply unit, in particular an inverter unit for connecting the power control device with a power network, for extracting energy from the energy supply, for supplying power into the power grid, and a control unit for controlling an energy flow between the power generation unit, the energy storage unit, the load unit and / or the power grid.