Describe the current behavior

#1302 introduces load flow capacity on a network with the detailed DC model. It solves the mathematical problem for the whole connected component at once. However, it is currently limited to network with one AC island, mainly for slack active power mismatch distribution issues.

Describe the expected behavior

It should be possible to run a load flow on a network with several AC islands, with each AC island managing individually its active power mismatch.

Describe the motivation

No response

Extra Information

This issue includes two main topics:

• The class LfAcDcNetwork contains several LfNetwork objects, representing both AC and DC networks of the same connected component. Therefore, the attribute numSC does no longer have a meaning for this kind of network. However, it is used to create ReportNode objects and in LoadFlowResultImpl.ComponentResultImpl. The value of this attribute in an LfAcDcNetwork must be clarified.
• The active power mismatch should be processed for each AC island individually. The "global" outer loop should be considered stable if all AC island's outer loop are stable.
  The effect on the AreaInterchangeControlOuterLoop shall also be investigated