A Lyapunov exponent based method for online transient stability assessment

The post fault transient stability of the power system is assessed in this paper using Maximum Lyapunov Exponent (MLE). The phase angles, reported by the PMUs at the generator buses are used for estimating the MLE of the system. The sign and the magnitude of the MLE serve as indicators to the stability of the system. The method utilized for estimation of the MLE is independent of the system model and is solely based on the measurement data of the system states, which can be obtained from the Phasor Measurement Units (PMUs). Different combination of fault duration and location are simulated to analyze the system stability using MLE on 3 machine 9 bus system and 10 machine New England (NE) 39 bus system.