Greenbyte Documentation

Lost Production Based on Production-Based Availability

For lost production calculations that are based on Production-Based Availability, we can’t use 1-A for unavailable time because production-based availability is defined using lost production. Instead, categorization determines what data should be used. The time categories available are:

  • Time with actual production (available time, Ta) - Lost production is set to 0

  • Time with both actual and potential production (partial performance, Tp)

  • Time with lost production (unavailable time, Tu) - Actual production is set to 0.

Lost production is calculated as:

Equation 4. 
Eli=0 if PaiPpi E_{li}=0\text{ if }P_{ai}\geP_{pi}


Equation 5. 
Otherwise Eli=16Tpi(Ppi-Pai) \text{Otherwise }E_{li}=\frac{1}{6}T_{pi}\left(P_{pi}-P_{ai}\right)


lost_production_production-based.png

where:

Eli is the lost production for a 10-minute period

Tui is the fraction of time during the 10-minute period that the wind turbine was unavailable

Tpi is the fraction of time during the 10-minute period that the wind turbine was partially performing.

1/6 is used to convert power (W) to energy (Wh). For a longer period of time lost production is calculated as

Equation 6. 
Et=i=1nEli E_t=\sum_{i=1}^nE_{li}


where n is the number of 10-minute periods.