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Greenbyte Documentation

Performance Index (Turbine)

This is a measure of how well the turbine is performing. It is calculated by dividing the actual production with the theoretical production for times when there are neither active stops, warnings nor curtailments.

The difference between the performance index and production factor is that the performance index filters out timestamps with active stops, warnings, and curtailments.

Technology

Wind

Remarks

This signal uses power with a fallback to energy but it requires either one of those to have a value to be calculated.

To calculate a performance index for a defined timestamp we require:

Absence of curtailment status to avoid the influence of curtailments in the actual energy production values

Equation
Performance_Index__Turbine__-_Equation.png

The actual and the potential production are calculated as follows:

  • Epotential+ = PCP,perf x T, if (PCP,perf) exists and is positive

  • Eactual+ = P x T, if power (P) exists and is positive

  • Eactual+ = Ee, if power (P) does not exist and energy export (Ee) is available

Where:

PI

is the Performance index.

Epotential+

is potential production, clamped to the positive part (negative values are changed to zero).

Eactual+

is actual production, clamped to the positive part (negative values are changed to zero).

PCP, perf

is Cascading Potential Power - Wind performance.

T

is device resolution in hours.

P

is Power.

Ee

is Energy Export (Turbine).

Note

  • If the actual energy (Eactual) is negative or zero, the performance index is considered as zero.

  • If the potential energy (Epotential) is negative or zero, the performance index is considered 1.

  • If the energy actual or energy potential do not exist, the performance index will have an N/A.

Inputs
perfoamcne_index_in.jpg
Usage Example

Plotted here in the Average over time widget:

performance_index_ex.jpg