Greenbyte Documentation

Lost Production Based on System Availability

For lost production calculations that are based on system availability, lost production is calculated as

Equation 7. 
Eli=0 if PaiPpi E_{li}=0\text{ if }P_{ai}\geP_{pi}


Equation 8. 
Otherwise Eli=16(Ppi-Pai) \text{Otherwise }E_{li}=\frac{1}{6}\left(P_{pi}-P_{ai}\right)


where:

Eli is the lost production for a 10-minute period

At is the system availability.

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

Equation 9. 
Et=i=1nEli E_t=\sum_{i=1}^nE_{li}


where n is the number of 10-minute periods.

Lost Production to Downtime

This calculation includes lost production when System Availability is Unavailable. This shows how much production is lost because the asset is stopped (for any reason).

Lost Production to Performance (Turbine)

Lost Production to Performance is the lost production when Time-based System Availability is considered Available. This is the opposite of how Lost Production to Downtime works.

Lost Production is the difference between potential energy and actual energy.

It is possible to configure when Time-based System Availability is available.

To determine if there is any lost production we look at the time-based availability. All lost production during a time step will be attributed to performance if the availability is 100%. Unlike Lost Production to Downtime, Lost Production to Performance can have negative values.

Technology

Wind: Turbine

Equation
lost_production_performance_turbine_eq.jpg

where:

ELPP

is Lost Production to Performance

A

is Time-based System Availability

statusC

is a curtailment status that exists for the timestep

Epotential

is potential energy production

Eactual

is Energy from Power

Pp

is the Cascading Potential Power for performance

T

is the device resolution in hours.

P

is Power

E

is Energy export

Inputs
lost_production_performance_turbine_in.jpg
Lost Production Total

This is the sum of Lost Production to Downtime (lost production when the asset is stopped) and Lost Production to Performance (lost production when the asset is operating).

Lost Production to Performance can be negative if the asset is performing above 100%, meaning that it is performing better than the power curve. Over time, if the asset is underperforming it will have Lost Production to Performance. But if the asset is later over-performing, it will even out the earlier Lost Production to Performance.

Lost Production to Curtailment is not connected in any way to the Lost Production to Downtime or Lost Production to Performance. Lost Production to Curtailment is only calculated if you create curtailment statuses yourself.

Note

This calculation includes lost production for time periods when the asset is considered available.

See System Availability for details on how System Availability allocates time periods to available or unavailable time.