Detection of transiently chaotic swings in power systems using real-time phasor measurements

In this paper, the concepts of transiently chaotic swings and windowed Lyapunov exponents in power system dynamics are described. An efficient computer method to detect a transiently chaotic swing from a set of real-time phasor measurements is presented. The method estimates the largest windowed Lyapunov exponent, /spl lambda//spl circ//sub [N/spl Delta/T]//sup 1/ as a detection index. In simulation results, it is shown that the proposed method has the potential to detect a transiently chaotic swing and the estimated /spl lambda//spl circ//sub [N/spl Delta/T]//sup 1/ can be used as an online stability index to predict multi-swing transient instability.>