Evaluation of Generator Inertia and Damping Coefficient Based on Dynamic Mode Decomposition

An accurate evaluation of the inertia and damping coefficient of the grid-connected generators can provide a reliable basis for the safe and stable operation of the system and the generator itself. For this reason, this paper proposes an assessment method for the generator inertia and damping coefficient based on the Dynamic Mode Decomposition (DMD). The eigenvalues extracted by the DMD and their corresponding eigenvectors are used to reconstruct the generator power and speed changes in time domain. On this basis, the electromechanical parameters (the inertia and damping coefficient) and the system characteristics (the eigenvalues and eigenvectors) are constructed, and then the linear equation is solved, realizing the evaluation of generator inertia and damping coefficient. The proposed method is simulated and verified by the IEEE 4-machine 2-zone system and the IEEE 10-machine 39-bus system. The results show that the proposed method is suitable for the evaluation of the generator inertia and damping coefficient in a multi-machine system with high accuracy.