Controlling wind turbines in presence of wake implications

Abstract

The invention is directed to a wind park, a wind park controller, and a method for controlling a first wind turbine (2, 2') of a plurality of wind turbines (2,3,4,...) of a wind park (1), wherein a second wind turbine (3, 3') of the plurality of wind turbines (2,3,4,...) can be affected by a wake region (10) caused by the first wind turbine (2, 2') which is positioned upstream of the second wind turbine (3, 3'). A current yaw state is determined, wherein the current yaw state is selected from at least one of: a) an actual rotor yaw misalignment angle (20) of the first wind turbine (2, 2'), wherein the actual rotor yaw misalignment angle (20) is defined as an angle between a rotating axis (21) of a rotor (22) of the first wind turbine (2, 2') and a current wind direction (23) at the rotating axis (21) upstream of the first wind turbine (2, 2'), b) an identifier representing whether the actual rotor yaw misalignment angle (20) is either in a range of positive yaw misalignment angles (24) or alternatively of negative yaw misalignment angles (25). Further, wind conditions are determined which are indicative of the potential wake inducement on the second turbine (3, 3'), such as wind direction. A rotor yaw offset angle set point (40) for the first wind turbine (2, 2') is defined, following a hysteresis (50) based on the current yaw state, the wind conditions, and at least one yaw angle hysteresis switching threshold (51, 52). Thereby immediate consecutive switching between a range of positive yaw offset angles and negative yaw offset angles is avoided.

Description

technical field [0001] The invention relates to a method and a wind park controller for controlling at least one wind turbine in a wind park comprising a plurality of wind turbines, and also to a wind park comprising the wind park controller. Background technique [0002] A wind farm includes a plurality of wind turbines. Depending on the current wind direction, some wind turbines are located downstream of other wind turbines. Upstream wind turbines may reduce the wind speed and wind energy experienced by downstream wind turbines. At downstream wind turbines, wind turbulence may also increase. The leeward region downstream or behind the upstream wind turbine may also be referred to as the wake region of the upstream wind turbine, or simply the wake. [0003] To reduce production losses caused by wind turbine wakes in wind farms, optimized blade pitch, rotor speed, power production set point, rotor pitch and / or yaw offset or other controls on the wind turbine can be used ...

AI Technical Summary

Problems solved by technology

[0009] In general, it must also be noted that all yaw movements generate mechanical loads or stresses on components such as bearings, and high yaw control activity may have a negative impact on these components in terms of their service life or maintenance cycles

Images