Update powsybl pf parameters to handle network files without single slack - #64
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Update default powsybl power flow solver parameters to handle network files without specified single slack (e.g. network with distributed slack).
By default, when the slack distribution is deactivated and there is no specified slack, powsybl would select the most meshed bus as slack to ease branch-related convergence. It could be a bus without any generator.
GridFM's power flow data processing expects the slack to be associated with a generator, hence the choice of the bus with the largest generator as slack to avoid conflict.
The affected parameters: