  The integration of distributed energy resources (DERs) into the electrical
grid causes various challenges in the distribution grids. The complexity of
smart grids as multi-domain energy systems requires innovative architectures
and algorithms for system control. While these solutions are good on paper,
several testing methods are required to test the applicability of components,
functions and entire systems to the existing energy grids. In this paper, a
full-scale low-voltage test setup in the Smart Grid Technology Lab (SGTL) at TU
Dortmund University is used to evaluate the capability of an Optimal Power Flow
Algorithm (OPF) to support voltage control, congestion management, and to
provide redispatch to the higher grid levels. While conventional redispatch is
commonly done preemptively, this paper analyses the possibility of providing
redispatch to the higher voltage levels without taking the future grid state
into consideration. The importance of this implementation is that the smart
grid application used to execute the OPF is configured based on IEC 61850 data
models, making the software independent of the hardware. Such standardised
control algorithms are interoperable and can be implemented on any hardware
that suits the requirements.
