Method for evaluating severity of power system fault

Discloses a serious degree of power system fault evaluation method of the present invention, the steps of: automatically generating a set of faults on the target grid system; selecting nodes included in the review; any of a set of fault fault transient simulation calculation organic group, according to the simulation information determining whether the power system has occurred angle, voltage, frequency instability; severe coefficients are calculated according to the fault power angle, voltage, frequency three indicators: the coefficient of the three serious obtained with weights derived synthesis serious factor; repeat the previous steps to complete the critical concentration factor fault set all fault calculations; fault set for each group according to the synthesis serious fault coefficient descending sort, the output list. This approach focuses on the impact of power system fault transient stability, can quickly target many types of grid failure sorted by severity, failure to identify constraints affect the system safe and stable operation.