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openego / data_processing

(geo)data processing, database setup, data validation
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control not always set dependend on p_nom? #293

Closed jankaeh closed 6 years ago

jankaeh commented 6 years ago

I just saw coincidentally, that the control strategy of generators is not consistently PV if p_nom is >= 50 MW and PQ if p_nom is < 50 MW. I work with v.0.3.2 and there are 6 generators with PV control and p_nom <50 and 300 generators with PQ control despite p_nom >=50

Might this be a bug, or is this planned?

ulfmueller commented 6 years ago

Renewables are always PQ. Are the 300 gens big REs?

ulfmueller commented 6 years ago

For the 6 below I do not have an idea. @IlkaCu Do you know about this?

ulfmueller commented 6 years ago

btw: @jankaeh do you apply non-linear power flow methods on our data model? For the linear power flow methods this is not relevant. This method has been our primary focus...

jankaeh commented 6 years ago

Yes, i use lopf and pf. 20 of the 300 are no REs

ulfmueller commented 6 years ago

Then the 6 and the 20 are of interest and seem to be a bug.

jankaeh commented 6 years ago

And there are some REs with control PV, but as the names are all 2000XY, I guess they are foreign and therefore PV-controlled?

ulfmueller commented 6 years ago

yes, that makes sense. We assume that those neighboring countries nodes are PV nodes avoiding big cross-border Q-flows. So from my point of view I would say it is nothing to bother about...

IlkaCu commented 6 years ago

I'll check our data model for this bug later today. This is where we set the control for generators in Germany: https://github.com/openego/data_processing/blob/master/dataprocessing/sql_snippets/ego_dp_powerflow_assignment_generator.sql#L228-L234

IlkaCu commented 6 years ago

As you already mentioned the 6 generators with p_nom < 50 MW and control = 'PV' are generators at the foreign buses. The 300 PQ-controlled generators with a p_nom >=50 MW are aggregates of small renewable or conventional power plants. Each of these power plants has an installed capacity <50 MW, but the aggregate may exceed the 50 MW limit. The control is set according to the installed capacity of the single power plant.