With reference to the Modelica Spec. 9.3.1:
For each non-partial non-expandable connector class the number of flow variables shall be equal to the number of variables that are neither parameter, constant, input, output, stream nor flow.

The only way to satisfy this requirement in MML3 is to add a "dummy" effort variable in both the power Inlet and Outlet connectors (e.g., Real NotUsed "not used effort variable to balance the connector"). For each connection-set that involves power connectors the value of the dummy variable must be written by one and only one component

Looking at MML3 I saw that the all the connection-set that involve power connectors contain one and only one Inlet connector, so the dummy variable could be written by the components that have a power input connector (e.g. the Generator). This can be done for example by adding a bounding equation where the connector is instantiated:

MetroscopeModelingLibrary.Power.Connectors.Inlet C_in(NotUsed = 0);

This solve also #100 and #118

Power connectors are not locally balanced because they only contain one flow variable : W #99

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