Probabilistic evaluation of voltage stability in MV networks

In today´s planning of MV networks, voltage stability is evaluated using deterministic extreme-value estimations, the results of which are very improbable and cause very expensive network extensions. Therefore a simulation tool using probabilistic methods has been developed considering the essential parameters for voltage stability in MV networks: the HV/MV transformer and its stochastically operating voltage regulator, consumers, suppliers and the switching state of the network during normal operation, maintenance activities or after faults. For the period of evaluation, the operation values of all parameters and their durations are determined continuously. The simulation results are finally used to show the voltage state distributions at every network node