logging.info messag should be an error

[uvchik]

In the wind_farm module line 399ff a logging message is shown if the wake_loss model 'wind_farm_efficiency' is chosen but no efficiency is given.

In my opinion an exception should be raised because the efficiency is mandatory to calculate the wake_losses. I think it is error prone to ignore it and to just show a logging info message.

[birgits]

@uvchik I agree. I am not sure though if there is a reason why @SabineHaas implemented it like that. Do you think we can wait until her return or do you necessarily want it in the v0.2.0 release?

[uvchik]

I think it is okay for v0.2.1 if we manage to release the v0.2.0 soon 😏

[SabineHaas]

I remember implementing it like this to not break longer simulations. But I agree that it should at least be a warning. I also wouldn't oppose to an error.

[uvchik]

I remember implementing it like this to not break longer simulations.

Following this argumentation we have to remove all errors. I think people should take care on there own e.g. by using try/except in there main script.

But I agree that it should at least be a warning. I also wouldn't oppose to an error.

Does it make sense to use the wind_farm_efficiency method without a valid efficiency?

• Yes that's fine -> nothing
• Yes, in some very special cases -> warning
• No, it does not make sense -> error

Do we have to catch the wrong behaviour later on?

• Yes because power * efficiency does not work if efficiency is None -> error
• No, that's fine -> warning or nothing (depends on the first question)

[SabineHaas]

oemof dev decision:
logging message will be changed into error message.
Add info in docstring: if wake_losses_model is 'wind_farm_efficiency' efficiency is needed.