Fast Probabilistic Assessment of Voltage Dips in Power Systems

The stochastic prediction of voltage dips due to faults in transmission and distribution systems can be effected applying the fault position method. Also assuming deterministic operating condition before the faults and pre-assigned failure rates of the faulted components, this method may require severe computational efforts in case of high dimension power systems. In the paper a Monte Carlo simulation procedure which properly include the fault position method is proposed to evaluate the voltage dip indices taking into account also the randomness of the pre-fault conditions and the uncertainties that can characterize the failure rate values. To reduce the computational efforts, a complete matrix formulation of the fault position method is used. Several numerical applications are presented and discussed with reference to a test system