Inertia Estimation of Equivalent Areas by a PMU-Based Approach Following Perturbations

This paper investigates the problem of inertia estimation of power system equivalent areas by a PMU-based approach. Assuming measurements available on the borders of the area, a reduced model is built based on the data acquired during a perturbation. An iterative method is proposed to calculate the parameters of an equivalent generator, and in particular its inertia. The dynamic behavior of the equivalents are compared with the behavior of the Center of Inertia (COI) of each area, and the equivalent inertia is estimated using a Least Squares approach. Results obtained for a 11-bus, 4 generators test-system are presented and discussed.