Evaluation of the Feasible Provision of Flexibility in Distribution Networks with Advanced Grid Monitoring

So far, several simulation methods for the aggregation of distributed flexibility providing units have been developed, which allows an estimation of the flexibility potential in distribution systems. However, the accuracy of the result in a real grid as well as the particularities of flexibility deployment as an ancillary service have yet to be demonstrated. Therefore, a holistic approach including the prediction, online aggregation and activation of flexibility was integrated into an existing grid monitoring system. Based on real grid measurements, the uncertainty of flexibility usage can be evaluated in a field test. The results prove, that a linearized OPF based aggregation method is suitable for use in grid operation. However, due to the stochastic behavior of LV-grids, a valid prediction of the flexibility potential cannot be guaranteed. Moreover, fluctuations in the flexibility provision may prevent a constant setpoint for a grid in a typical time interval of e.g. 15 minutes.