Nonlinear Koopman modes and coherency for multimachine power systems

Abstract

We perform modal analysis of nonlinear swing dynamics of multimachine power systems based on the so-called Koopman operator. Modes derived through spectral analysis of the Koopman operator, called Koopman modes, provide a nonlinear extension of linear oscillatory modes and a novel technique for identification of coherent generators using finite-time data of swing dynamics.