US 11,705,737 B2
Method for feeding in electrical power by means of a wind power installation
Johannes Brombach, Berlin (DE); and Tobias Fredewess, Aurich (DE)
Assigned to Wobben Properties GmbH, Aurich (DE)
Filed by Wobben Properties GmbH, Aurich (DE)
Filed on Jul. 28, 2021, as Appl. No. 17/387,481.
Claims priority of application No. 20188425 (EP), filed on Jul. 29, 2020.
Prior Publication US 2022/0037889 A1, Feb. 3, 2022
Int. Cl. H02J 3/46 (2006.01); H02J 3/38 (2006.01)
CPC H02J 3/46 (2013.01) [H02J 3/381 (2013.01); H02J 2203/20 (2020.01); H02J 2300/28 (2020.01)] 24 Claims
OG exemplary drawing
 
1. A method for feeding electrical power into an electrical supply network using an inverter-controlled infeed unit, comprising:
feeding, by an inverter arrangement including a plurality of inverters, an output power into the electrical supply network;
selectively galvanically isolating each inverter of the plurality of inverters from the electrical supply network using an associated isolating switch of a plurality of isolating switches, each inverter of the plurality of inverters being associated with a circuit including a plurality of switches configured to generate a sinusoidal output current using pulsed actuation of the circuit;
generating a plurality of partial powers by the plurality of inverters, respectively;
summing the plurality of partial powers to produce the output power;
depending on the output power, operating one or more first inverters of the plurality of inverters as active inverters that respectively generate a partial power, and
depending on the output power, operating one or more second inverters of the plurality of inverters as passive inverters that respectively do not generate a partial power, wherein one or more of the passive inverters are operated as blocked inverters and remain galvanically coupled to the electrical supply network.