The arrangement (2) has a photovoltaic system (8) connectable with an electric supply network (4) over a power supply (24) for feeding electrical power into the network. A network monitoring system (12) comprises an overload detection unit (14) for detecti...

The present invention provides a method of controlling a combined plant to provide frequency support to a power grid operating at a variable grid frequency. The combined plant includes at least one generator (e.g. a plurality of wind turbine generators) an...

The arrangement (1) i.e. power manager, has a control device connecting an input of a switch with an output of the switch. A control input of a reverse current relay (UR) switches a switching element between two switching states. The switching element disc...

A method for controlling an amount of power delivered by a power source (16) to a power line (32). An energy storage unit (38) receives portions of energy generated by the source and provides stored energy to supplement power output from the source to the ...

A power supply system comprises a battery which can be charged/discharged, a charging/discharging apparatus which charges/discharges the battery, and a charging/discharging power limit controller which outputs a charging/discharging power limit control sig...

The case (100) has a reversible converter (C20) connected to a battery (B10) and directly interconnected with a power bus (M100), where a photovoltaic generator (V), a wind generator (E), an electric generator (G) and a water turbine (R) are connected to t...

A static energy supply unit (2) has an energy store (4) connected to an ac supply network (SN) by a power converter (8). A unit controller (20) for the static energy supply unit (2) includes an amplitude controller (26), a phase controller (30) and a frequ...