Method for yaw control of a wind turbine and a wind turbine having a yaw control

A method for yaw control of a wind turbine, the wind turbine including 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 comprising:

• detecting the 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 electric power consumption of the wind turbine is reduced compared to the normal mode of operation, wherein the less-active mode of operation includes at least one of:
• increasing an averaging time of at least one relevant signal for the yaw control, wherein the increase takes place compared to the averaging time during the normal mode of operation;
• and,
• increasing an allowed misalignment of the nacelle with respect to the wind direction, wherein the increase takes place compared to the allowed misalignment of the nacelle with respect to the wind direction during the normal mode of operation.