Power electronic converters are increasingly operated in networks of local, intelligent energy systems, for example as smart and micro-grids. Compared to stand-alone operation, this results in a much more complex control system framework, since the interaction of different power electronic components as part of energy storage systems, sources and loads must be considered. In addition to the primary control of current, voltage and frequency within local energy nodes, an optimized power scheduling on secondary and tertiary level is necessary to ensure safe operations (especially in islanded grids) and to pursue secondary objectives such as the minimization of power peaks or the maximization of renewable energy generation. In this context, it is often necessary to cushion the fluctuating feed-in of regenerative generators (PV, wind power plants, ...) by intelligent storage systems (battery, flywheels, ...). Consequently, sector coupling (heat, gas, mobility, ...) is becoming increasingly important.