A general purpose method for on-line dynamic security assessment

Time domain-based online dynamic security assessment (DSA) systems require a fast and reliable method for simulation termination and margin calculation. B.C. Hydro´s online DSA uses the second kick method which proved to be an elegant and reliable method for this purpose. This method was later enhanced to improve implementation and computation requirements. The methods presented so far require the mode of disturbance (MOD) information. In this paper, the fast second kick method is expanded to remove the need for the MOD data. The new method has been tested on the large scale systems of B.C. Hydro and Hydro Quebec and the results have been compared to those of the fast second kick method. The results obtained indicate that the new method predicts the stability limits accurately. They also indicate that the new method takes in average 20% longer than the fast second kick method to calculate the stability limit. The implementation requirement for both methods is similar