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Please check if the PR fulfills these requirements
Does this PR already have an issue describing the problem?
No
What kind of change does this PR introduce?
Feature / bug fix
What is the current behavior?
Currently, we compute a max on each of the generators from the proportional scalable (by multiplying the max value for the whole glsk by the proportion of each generator). This is not quite correct though if we scale while trying to respect the volume asked for a scale, in the case where some generators become saturated (the remainder can not be added to the other generators because of the max value applied to each generator)
What is the new behavior (if this is a feature change)?
With the new API in powsybl core, it is now possible to define a max on a proportional scalable. This replaces the old max we used to put per generator (in this case precisely)
Does this PR introduce a breaking change or deprecate an API?