Estimation of Electromechanical Modes of Power Systems by Transfer Function and Eigenfunction Analysis

This paper presents a method of estimating the electromechanical damping and frequency coefficients of interconnected power systems. The method combines AESOPS approach and eigenvalue analysis. Computation time is reduced by applying an approximation based on an eigenvalue sensitivity formula, which evaluates eigenvectors of the 2n_g × 2n_g [A(ω_K)] and [A(ω_K)]^T matrix and thereafter use them to obtain improved estimates of the eigenvalues. Numerical results from a 16-generator system demonstrate the feasibility of the proposed method.