Sma Solar Technology Ag

Bernhard Sofaly

Oliver Prior

Lars Bethke

Oliver Kirsch

A method for the feeding of electrical current into a line branch of an electrical installation that is protected by a line protection fuse and is designed for a current up to a maximum permissible value includes feeding into the line branch an electrical current from an external energy supply network and electrical current from an energy generating system. The method further includes limiting the feeding in of the electrical current into the line branch from the external energy supply network by the line protection fuse, which prescribes a limit value for the electrical current fed into the line branch, and controlling the feeding in of the electrical current generated by the energy generating system so that no more than a specific, but variable maximum current is fed into the line branch. The variable maximum current is raised, under the control of a feed control, to allow more electrical current from the energy generating system to be fed into the line branch after the limit value of the line protection fuse has been lowered, under the control of the feed control, in such a way that the maximum permissible value of the current in the line branch is not exceeded even after the raising of the maximum current.

Method and feed control for the feeding of electrical current into a line branch

A method for limiting an output power of an inverter having an output bridge and an upstream boost converter includes determining a first measurement variable representative of a bridge temperature and a second measurement variable representative of an output power of the inverter. The method also includes determining a third measurement variable representative of a generator voltage at generator connections of the inverter or a fourth measurement variable representative of an output voltage at a power output of the inverter, and reducing the output power supplied to a power supply grid to a reduced power value. The reduced power value is determined based on the first measurement variable, the second measurement variable and at least one of the third and fourth measurement variables. A control device having such functionality is also disclosed.

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Kassel, Germany

Bernhard Sofaly