Method and system for determining yaw heading of a wind turbine

A system for determining a yaw heading (θheading) of a wind turbine, the wind turbine having a tower and a nacelle that includes a machine head and rotor at a top thereof, the system comprising:

• a single rover receiver of a global navigation satellite system (GNSS) at a fixed position relative to the nacelle spaced from a centerline axis of the nacelle;
• a controller in communication with the rover receiver, the controller configured to perform the following operations:
• determine a GNSS geographic location (“geo-location”) of a tower top pivot point (TPP);
• determine an angular offset of the rover receiver (βrover) relative to the centerline axis of the nacelle based on a relationship of βrover=sin−1 (x/r), wherein (r) is a distance between the rover receiver and the TPP and (x) is a predetermined fixed distance of the rover receiver to the centerline axis of the nacelle;
• based on the GNSS geo-location of the TPP and a GNSS geo-location of the rover receiver, determine an angular vector () relative to North between the TPP and the rover receiver;
• and
• compute the yaw heading (θheading) from a difference between the angular vector () and the angular offset (βrover) of the rover receiver based on the relationship:
• θheading=(angular vector())−(βrover).