  In this project we evaluate a framework for synchronization of mixed
machine-converter power grids. Synchronous machines are assumed to be actuated
by mechanical torque injections, while the converters by DC-side current
injections. As this approach is based on model-matching, the converter's
modulation angle is driven by the DC-side voltage measurement, while its
modulation amplitude is assigned analogously to the electrical machine's
excitation current. In this way we provide extensions to the swing-equations
model, retaining physical interpretation, and design controllers that achieve
various objectives: frequency synchronization while stabilizing an angle
configuration and a bus voltage magnitude prescribed by an optimal power flow
(OPF) set-point. We further discuss decentralization issues related to clock
drifts, loopy graphs, model reduction, energy function selection and
characterizations of operating points. Finally, a numerical evaluation is based
on experiments from three- and two-bus systems.
