Stochastic modelling of high-speed reclosing in probabilistic transient stability studies

The traditional design of a power system includes testing the stability of the system under specified basic contingencies. This `worst case´ approach has been used widely and successfully by most power utilities. It is obvious that a wide range of contingencies are possible at any location in the system. This leads to the realisation that a stochastic approach could be used in the analysis to include the probabilities associated with all possible contingencies to obtain a more realistic appraisal of the system stability. A stochastic modelling for high-speed reclosing is presented, and two sets of probabilistic transient stability indices are introduced