Stability analysis based on synchronized phasor measurements

A method to analyze stability on a multi-machine power system was developed. For steady state estimation the phasor voltages and angles were used to calculate the frequency deviations. The calculated frequency deviations were then filtered by an FFT filter to extract the power oscillations. By linearly approximating a set of differential equations, the eigenvalues for the system were identified from the dominant mode. To do transient stability analysis, rotor angles were calculated from generator parameters; phasor voltages and currents by using direct methods. The equal area criterion was used to analyze disturbance scenario and determine the critical stability region of the power system. The algorithms developed were tested on a four-machine two area system by simulation of disturbance scenario in the network.