Estimation of Unknown Large Power System Dynamics

Instead of approximating an unknown large power system in the neighboring area by an infinite bus of constant voltage and constant frequency, this paper models the large power system DYNAMICS as one large electric machine so that both the voltage and the frequency of the unknown power system bus may vary. For the parameter estimation, an unknown dynamic power system model is developed, and a local power system model is adapted to accommodate these changes. An estimation technique is applied and an alogrithm is presented. Computer results show that the unknown large power system parameters can be uniquely determined regardless of the power factor of the local system, the local load, a strong or weak intertie, the unknown system inertia and damping, and the initial guess for the estimation.