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

Claim 8:
9. A wind turbine for feeding electrical power into an electrical supply network having a network voltage, the wind turbine comprising:
at least one inverter configured to feed the electrical power, wherein the at least one inverter has:
a 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; and

a controller configured to:
control the at least one inverter,
control the feeding of the electrical power into the electrical supply network using the at least one inverter in a normal mode in response to determining that the network fault of the electrical supply network is not detected,
detect a network fault in response to the network voltage being less than an undervoltage value associated with nominal network voltage,
in response to detecting the network fault, interrupt the feeding of the electrical power or reduce feeding of the electrical power,
in response to detecting an end of the network fault, terminate interrupting the feeding of the electrical power or terminate reducing the feeding of the electrical power,
limiting the fed-in electrical power 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.