Slow Coherency Identification and Power System Dynamic Model Reduction by Using Orthogonal Structure of Electromechanical Eigenvectors

Identifying generator coherency with respect to slow oscillatory modes has numerous power system use cases including dynamic model reduction, security analysis, or integrity protection schemes (e.g., islanding). Despite their popularity in both research and industry, classic eigenvector-based techniques may not always return accurate results. The multiple past endeavors improve accuracy often lack a solid mathematical foundation. Motivated by these deficiencies, we propose an alternative consistent approach coherency. Firstly, new is introduced accurately detect coherent generators effectively minimizing generic normalized cuts. As by-product, the can also guide choice of number groups. Secondly, it shown that combination proposed enhanced version inertial aggregation method allows produce equivalents even if selected groups relatively low.