[CCP] Clarify conventions

[DuneSe]

Proposal: Using energy instead of power is not intuitive. Additionally, the signs convention is often opposite to the usual convention. The use of relative boundaries is not intuitive to express flexibility By: Anaïs Walle, Trialog

[DuneSe]

Addition of a paragraph to clarify the conventions Initially the signs were designed for consumption flexibility Energy vs power already discussed (same for 1 hour); power can have 2 meanings in english: use of energy to avoid confusion Fabio Lilliu will add a description of this in the specification

[cerne739]

Energy notation is used because it is a trading product on market, while power is not. The sign convention 'consumption = negative' and 'production = positive' supports the spcification rule 'lower < upper' in several parameters. Opposite sign convention may result in confusion. The boundaries are expressed as absolute, Therefore the 'default' schedule was introduced

[FabioLilliu]

About "power", it is used 3 times through the whole document, and it never refers to what is represented by FOs, which is always energy: I agree with the above comment from Gregor that FOs should refer to energy. We can add it at the very end of the Introduction section, by writing something like

"It is important to note that FlexOffers represent energy and not power: it is a convention decided because all slices have a duration. It can be converted to average power per slice if needed. Moreover, the metering is done on the energy." (or we can add any other good reason here).

About the signs, I think that either choice is ok as long as it is consistent through the whole document. The FO examples in Section 2 are written with "consumption = positive", but if we decide to adopt the opposite convention, it is very easy to obtain consistency by changing the signs in examples and figures.

It would however be useful to add the following definition: I would put it as soon as Section 1.4, right after the bullet points.

"FOs define energy flexibility by specifying lower and upper bounds for energy, which identify the minimum and maximum amount of energy that can be produced/consumed at the considered time slice. Positive values indicate energy consumption, negative values indicate energy production" (with the words "consumption" and "production" swapped in case we decide to denote "production = positive").

[DuneSe]

Signs conventions still needs to be discussed Gregor and Torben will check A new parameter could be added to clarify

[DuneSe]

Consumption = negative, production = positive