Patent ID: 11870265
Assignee: WOBBEN PROPERTIES GMBH
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  F  Y | IPC F  H

Claim 0:
1. A method for feeding electrical power into an electrical supply network using at least one wind turbine, comprising:
in response to determining that a network fault of the electrical supply network is not detected, feeding the electrical power into the electrical supply network using an inverter of the at least one wind turbine in a normal mode, wherein:
the electrical supply network has a network voltage, and
the inverter has a direct current (DC) voltage intermediate circuit having an intermediate circuit voltage and a chopper circuit coupled to the DC voltage intermediate circuit and configured to discharge electrical energy from the DC voltage intermediate circuit:

detecting the network fault in response to the network voltage being less than an undervoltage value associated with a nominal network voltage;
in response to detecting the network fault, interrupting the feeding of the electrical power into the electrical supply network or reducing the feeding of the electrical power into the electrical supply network;
in response to detecting an end of the network fault, terminating the interruption of the feeding of the electrical power or terminating the reduction of the feeding of the electrical power;
limiting the fed-in electrical power to a power limit during the network fault and/or after the end of the network fault; and
limiting the intermediate circuit voltage based on the power limit using the chopper circuit in order to limit the fed-in electrical power to the limit power during the network fault and/or after the end of the network fault.