Impact of saturation nonlinearities/disturbances on the small-signal stability of power systems: An analytical approach

In this paper, a multi-objective optimization model is presented to estimate the practical stability region and maximum endurable disturbance ejection for a small-signal power system dynamic model with saturation nonlinearities and disturbance rejection. Iterative algorithms are developed o solve for Pareto optimized solutions (POS) of this optimization. Furthermore, as an application of this approach to power systems, a method to nalyze the impact of saturation nonlinearities and disturbance rejection on power system small-signal stability is introduced based on the estimated tability region and maximum endurable disturbance rejection. Numerical results of a test power system with detailed saturated PSS controllers re described, indicating the reliability and simplicity of the method. 2007 Elsevier B.V. All rights reserved.