Turbine Scheduling - Underwriters-Labs/renewables.openwind.help GitHub Wiki

One immediate benefit of time series energy capture is to be able to more transparently and naturally estimate the effects of curtailments on energy capture.

Figure 1: Turbine Scheduling

The effects of turbine scheduling can only be calculated with time series energy capture. Otherwise the effect must be input as a simple loss in the Curtailment Losses dialog described in Energy Losses. The table shown in figure 1 illustrates several different ways in which turbine scheduling can be used in Openwind:

In the example shown above, turbines 1,2,3 and 4 have a noise curtailment in effect from 8pm to 6am every night. This noise curtailment has been specified by setting the environmental sensor noise limits to the night-time noise limit and then optimising the NRO models for that limit. The resulting turbine types have then been copied into the first schedule of each turbine using the button Copy Turbine Types To First Schedule. Choosing this action brings up the following dialog:

Figure 2: Copy Turbine Types To First Schedule

Turbines 2,3 and 4 have a shadow flicker curtailment defined as a schedule (it can alternatively be defined as time-series availability). This curtailment has been defined automatically in the environmental sensor layer properties shadow flicker tab.

All four turbines shown are curtailed for bats. From 30 minutes before sunset (sunset-0:30) to 30 minutes after sunrise (sunrise+0:30) all turbines are off from 0 to 6 m/s. Another, better way to achieve this would have been to copy the turbine type and then alter its cut-in speed but in this case, as we are using NRO modes, the user has chosen to keep things simple.

As well as using the Enable checkbox to enable or disabling turbine scheduling for this site layer, it is possible to enable and disable each category of curtailment using the checkboxes above (WSM, General, Environmental, Noise, etc).

When there are multiple scheduling conditions defined for a turbine, they are tested in turn (from left to right) for each any one value of time, t, and the first schedule in the list which includes time t determines what action is taken. If it does not fall within any of the defined scheduling tests then the turbine used is the default specified in the Site Layer and it is operating normally.

It is possible to change the order in which the schedules are applied by choosing the Change Order checkbox. This adds arrows to each schedule for this turbine and those can be used to reorder them. Pressing the All button will pop up a dialog which allows the different categories of curtailment to be reordered for all turbines.

New schedules can be added by pressing the New Schedule for Current Turbine button.

**Figure 3: **

This dialog can be used to specify the category that the resulting loss breakdown will use. By default, there are no limits on the schedule. This dialog can be used to limit the date range, time range, directions, wind speeds, temperature range, turbulence range and so on.

The action can be Off, Default(On) or any of the turbine types that are available in the workbook.

Once a schedule has been defined, the Fill Down button can be used to copy the schedule to multiple turbines. In the above example in figure 1, Fill Down was used to apply the bat curtailment to every turbine in this site layer.