Estimation of synchronous generator model parameters operating under unbalanced three-phase conditions

In this paper, a trajectory sensitivity method (TSM) is used to estimate parameters of a synchronous generator model suitable for unbalanced conditions which are typical of distribution systems. The current formulation and mechanical equations which represent the synchronous machine have parameters whose value modification cause significant changes in system´s output. Trajectory sensitivity method is used to estimate the parameters which most affect the behavior of the system and whose trajectory sensitivity functions have comparable values. The obtained results show the method is able to estimate the parameters with great accuracy, once the initial values of the parameters are inside the convergence region, even when the system is liable to a high level of imbalance. It can also be noticed through the results that, even considering great modifications in the parameters, the convergence region is large enough to guarantee the correct estimation of the parameters.