A blade adjusting device for a wind turbine is connected to a plant safety chain and can open and close the plant safety chain by activating a switch. If a fault is detected in one of the blade adjusting devices, the respective control unit can open the plant safety chain. By opening the safety chain, a signal is sent to the blade adjusting devices, and so all the blade adjusting devices initiate a synchronous safety operation of at least two rotor blades when the signal is received.

A method for providing backup control for a supervisory controller of at least one wind turbine includes observing, via a learning-based backup controller of the at least one wind turbine, at least one operating parameter of the supervisory controller under normal operation. The method also includes learning, via the learning-based backup controller, one or more control actions of the at least one wind turbine based on the operating parameter(s). Further, the method includes receiving, via the learning-based backup controller, an indication that the supervisory controller is unavailable to continue the normal operation. Upon receipt of the indication, the method includes controlling, via the learning-based backup controller, the wind turbine(s) using the learned one or more control actions until the supervisory controller becomes available again. Moreover, the control action(s) defines a delta that one or more setpoints of the wind turbine(s) should be adjusted by to achieve a desired outcome.

A power backup system includes a multi phased energy storage and a backup supply. The energy storage includes battery strings, each capable of supplying either an AC or DC voltage to a load. During normal operation, the backup supply is configured for being supplied with an AC voltage from a utility grid and being connectable to a DC voltage supplying battery string of the energy storage. During abnormal operation, the backup supply is configured for, in a first period of time, being supplied from a DC output voltage established by the a first battery string and after expiration of the first period of time being supplied from the AC output voltage established by a second battery string.

The present invention relates to a fault-tolerant control system for a wind turbine comprising a plurality of controllable wind turbine components, the control system comprising control means for generating a replica of essentially concurrent set-point values, a data communication network for transmitting the replica of essentially concurrent set-point values to the plurality of wind turbine components, and a plurality of decentralized voting means being arranged so that a decentralized voting means is assigned to each wind turbine component, each decentralized voting means being adapted to select one set-point value out of the replica of set-point values. The present invention further relates to a wind turbine and to an associated method.

A method is for yaw control of a wind turbine. The wind turbine includes a wind turbine controller, a regular power supply to supply the wind turbine with electric power in case of a normal mode of operation, and a power backup system to supply the wind turbine with electric power in case of a grid outage. The method includes: detecting a grid outage for the wind turbine, switching from the regular power supply to the power backup system in case of the detected grid outage, and switching the wind turbine from the normal mode of operation to a less-active mode of operation in which the electric power consumption of the wind turbine is reduced compared to the normal mode of operation.

A power backup system includes a multi phased energy storage and a backup supply. The energy storage includes battery strings, each capable of supplying either an AC or DC voltage to a load. During normal operation, the backup supply is configured for being supplied with an AC voltage from a utility grid and being connectable to a DC voltage supplying battery string of the energy storage. During abnormal operation, the backup supply is configured for, in a first period of time, being supplied from a DC output voltage established by the a first battery string and after expiration of the first period of time being supplied from the AC output voltage established by a second battery string.

The present invention relates to a wind turbine comprising an internal power supply grid for distributing power to a number of power consuming units of the wind turbine, the wind turbine further comprising a power backup system connected to the internal power supply grid for supplying power to said internal power supply grid during a grid fault, wherein the power backup system comprises a controllable power storage module providing a total backup voltage that falls within a nominal voltage range of the internal power supply grid of the wind turbine. The present invention also relates to a power backup system and an associated method.