Panel Session on Data for Modeling System Transients Determination of Rotating Machine Parameters for Transients Simulations

A rotating machine is a very complex device that involves electrical, mechanical and control systems. Therefore, the whole representation of a machine requires the specification of electrical and mechanical parameters, as well as control system data. The representation of the mechanical part and the control systems are only needed for low frequency transients [1]. An accurate representation of the mechanical part is important for some specific studies, such us torsional oscillations (subsynchronous resonance SSR), transient torques or turbine-blade vibrations [2]. For a discussion on this subject see [1], [3] – [7]. This presentation is related to the determination of electrical parameters of ac rotating machines. They are usually obtained in one of the following forms : • data supplied by manufacturers (conventional stability format data, standstill frequency response), • data from field tests (on-line frequency response, load rejection test, other tests), • computer calculations, using for instance the finite-element method [7].