Toward real-time detection of critical contingency of large power systems

On-line Transient Stability Assessment (TSA) program can fast identify a list of critical contingencies. A real-time critical contingency (RTCC) detection system is to detect, on the basis of the real-time measurements provided by PMUs and the list of critical contingencies, the occurrence of a critical contingency is presented. The RTCC detection system is composed of five detectors. Each of them is designed and placed in a sequential order so as to achieve absolute capture of the occurrence of critical contingencies. The system has been evaluated in 2 test systems and one large-scale power systems with very promising results. The effectiveness of the developed critical contingency detection system is evaluated on 96 contingencies of a 10-machine, 39-bus power system, on 108 contingencies of a 50-generator, 145-bus power system and on 4588 contingencies of a 313-machine, 1648-bus power system.