+6.5% AEP gain after rotor imbalance correction

Turbine Model
Gamesa G87 2.0MW
Windfit Feature
Rotor Balance
Rotor Balance
1
Windfit detects an aerodynamic rotor imbalance.
1: Windfit detects an aerodynamic rotor imbalance.
3 months later
2
Gamesa confirms the diagnosis and corrects a 4° blade pitch offset.
2: Gamesa confirms the diagnosis and corrects a 4° blade pitch offset.
3 weeks later
3
Windfit measures a gain of +6.5% AEP.
3: Windfit measures a gain of +6.5% AEP.

Static yaw misalignment detection and correction

Turbine Model
Gamesa G87 2.0MW
Windfit Feature
Yaw Misalignment
Yaw Misalignment
1
Windfit detects a significant and stable static yaw misalignment.
1: Windfit detects a significant and stable static yaw misalignment.
2
A LIDAR campaign on site, using Epsiline's YawAdvisor, confirms the yaw misalignment diagnosed by Windfit.
3
A yaw angle correction of -5.3° is applied to the turbine’s controller, leading to 2.3% immediate AEP gain.
3: A yaw angle correction of -5.3° is applied to the turbine’s controller, leading to 2.3% immediate AEP gain.

Rotor mass imbalance correction

Turbine Model
Nordex N90 2.3MW
Windfit Feature
Rotor Balance
Rotor Balance
1
Windfit detects a high mass imbalance upon installation.
1: Windfit detects a high mass imbalance upon installation.
2
Our client is alerted and calls Cp.max to balance the rotor.
2: Our client is alerted and calls Cp.max to balance the rotor.
3
A total of 275 kg weights is added to the blades, significantly decreasing the rotor mass imbalance.
3: A total of 275 kg weights is added to the blades, significantly decreasing the rotor mass imbalance.

Yaw misconfiguration detected on a brand new wind farm

Turbine Model
Vestas V90 2.0MW
Windfit Feature
Yaw Dynamics
Yaw Dynamics
1
Windfit is installed on all 6 turbines of a wind farm.
1: Windfit is installed on all 6 turbines of a wind farm.
2
Windfit detects larger and rarer yaw movements on 3 of the wind turbines.
2: Windfit detects larger and rarer yaw movements on 3 of the wind turbines.
3
The turbines gain +1% AEP once all turbines are correctly configured.

1.5% AEP loss detected and corrected in two days

Turbine Model
Enercon E70 2.3MW
Windfit Feature
Rotor Balance
Rotor Balance
1
Windfit detects a rotor imbalance and alerts the operator.
February 4th
2
The asset manager calls Enercon.
February 5th
3
The O&M team goes on site and confirms a pitch offset between the three blades.
3: The O&M team goes on site and confirms a pitch offset between the three blades.
4
The O&M team immediately corrects the issue.
4: The O&M team immediately corrects the issue.

Aerodynamic imbalance impacts on wind turbine performance

Turbine Model
Enercon E70 2.3MW
Windfit Feature
Rotor Balance
Rotor Balance
May, 11th
1
Windfit detects an increase of the aerodynamic imbalance.
Shortly after
2
Sereema's expert team confirms a significant decrease of the wind turbine performance.
2: Sereema's expert team confirms a significant decrease of the wind turbine performance.
3
The O&M checks the zero angle of the blades and corrects a 3° pitch offset on one of them, which leads to a 6.5% AEP gain.
3: The O&M checks the zero angle of the blades and corrects a 3° pitch offset on one of them, which leads to a 6.5% AEP gain.