Regarding the calculation of output power in Floris

[yzl429]

Hello everyone, what is the time scale used in Floris to calculate the average output power of wind turbines? Is it at the minute level, hour level, or daily level?
I look forward to your response.

[misi9170]

Hi @yzl429 , FLORIS is a steady-state model, so there is no real notion of a "time scale". The power output from the turbines assumes that the flow is steady. With that being said, it is reasonable to use FLORIS to predict the time-averaged behavior of a wind farm, as long as that time averaging takes place over a "long enough" window that the effects of wake propagation, wake meandering, etc can be accounted for. For instance, we often use FLORIS to model ten-minute average power for wind farms (but, in reality, there will likely still be wake propagation effects happening at this time scale). I would say 10 minutes is a lower bound.

So, to sum up, it's best not to think about a time scale when using FLORIS since it's a steady-state model. It's much better to think of FLORIS as modeling time-averaged behavior for any given inflow condition (wind speed, wind direction, etc). Provided your time scales are long enough, you can reasonably use FLORIS for mimicking time-dependent behavior.