Unity AI Insights: Classification Flag for Wind Turbines

Utility Curtailment occurs whenever wind turbines are curtailed by the Power Plant Controller (PPC), as reflected in the Utility Active Power Setpoint signal. This is evaluated separately in the Curtailment Flag Unity APM: Curtailment Flag, where a state value of [1, 3, or 5] indicates curtailment with corresponding energy losses.

Uprated or Overpower refers to when wind turbines operate above their rated capacity, either intentionally (uprated) or unintentionally (overpower).

Overdesign is when a site’s AC capacity is higher than the site’s contractual limit of allowable AC capacity to output to the grid (the Active Export Power Limit). This means that some wind turbines will intentionally be derated, in order to limit the total production to meet the contractual limit.

Site Down indicates that all of a site’s wind turbines have stopped.

Turbine down indicates periods when wind turbines are stopped despite sufficient wind speed for operation, within the range defined by the Rated Cut-In and Rated Cut-Out thresholds.

Down Icing occurs with the same conditions as Turbine Down, with an additional meteorological data factor suggesting icing that is likely.

Outside Evaluation Limits refer to periods excluded from analysis when wind speed falls outside the Rated Cut-In and Rated Cut-Out range, while active power remains at least 1% of the AC Capacity.

Anomalies in the Nacelle Wind Speed are detected when a wind turbine appears to be generating more power than the power curve indicates is possible. This could indicate that an anemometer is blocked, broken, or otherwise misreading the wind speed.

Intentional derating of a wind turbine involves deliberately reducing its maximum power output to address factors such as high temperatures or excessive loads, promoting more stable operation and extending the turbine's lifespan.

Indicates Degraded performance of a wind turbine when the meteorological conditions show that icing is likely.

Indicates Degraded performance of a wind turbine without a detected root cause.

Any data which is not identified by the above tests is considered as Full Performance.