“Impact of Modeling Magnetic Saturation on the Estimation of Synchronizing and Damping Torques of Synchronous Machine”
Fawzi A. Rahman AL Jowder
Abstract — This paper investigates the influence of modeling magnetic saturation on the synchronizing and damping torques of a salient pole synchronous machine. Three models of a salient pole synchronous machine, based on state space d-q modeling, are used to perform the comparison. These models are: (1) Unsaturated state-space model, (2) Saturated state-space model ignoring the cross-saturation and (3) Saturated statespace model including cross-saturation. Using a method developed in the literature, which depends on the time responses of the rotor speed, rotor angle and electrical torque, the synchronizing and damping torques have been estimated and compared for different loading conditions using the three models of the synchronous machine. In addition, time domain simulations have been performed to examine the three models under small and large disturbances. It has been shown that including magnetic saturation in the model of synchronous machine plays an important rule in estimating the synchronizing and damping torques which in turns provide more accurate prediction of the behavior of the machine under small and large disturbances.