LAUSR

This letter revisits interarea oscillation analysis using networked control analysis techniques. The power system analysis problem is analyzed as a networked control problem, specifically consensus control of homogeneous systems with static output feedback. The power grid is represented by a graph Laplacian matrix. Stability of the entire system can be evaluated by individual system dynamics and graph Laplacian's eigenvalues. Through this technique, the classical large-scale power system analysis problem is decomposed into multiple small-scale system analysis problems. Analysis of the classical two-area four-machine system is conducted by the proposed approach and compared with the small-signal analysis results from Power System Toolbox. The interarea oscillation mode is found to be related to the second smallest eigenvalue of the graph Laplacian matrix, while the local oscillation modes are related to the other eigenvalues of the graph Laplacian matrix.