The change of power system response after successive faults

This paper illustrates the usefulness of visualizing the secure operating domains and the value of dynamic analyses when considering the vulnerability of a power system. The paper includes studies of the secure power transfer limits and vulnerabilities of the IEEE Reliability Test System (RTS). The limits and vulnerabilities are determined by simulating the dynamic response of single and multiple faults. The results are presented by visualizing the secure transfer domains as a function of the power flow on critical transfer corridors. The paper also provides an estimate for the frequency of blackouts related to the different operating domains. The results show how the vulnerability of the power system increases in steps as the amount of power transfer over a corridor increases.