Comparison of MIMO system identification methods for electromechanical oscillation damping estimation

The paper presents two groups of measurement based multi-inputs, multi-outputs (MIMO) system identification approaches, which are subspace state-space identification and transfer function identification. The purpose is to compare the performance and features of these methods in terms of electromechanical oscillation damping estimation. The selected methods are validated by using ambient data and ring-down data in the 16-machine 68-bus Northeast Power Coordinating Council (NPCC) system. Meanwhile, the advantages and limitations of technologies are described.