Panel Session on Data for Modeling System Transients ...

Panel Session on Data for Modeling System Transients Determination of Rotating Machine Parameters for Transients Simulations Juan A. Martinez Universitat Politècnica de Catalunya Barcelona, Spain

I. SUMMARY 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]. A detailed model of a rotating machine is only needed for low frequency transients; it includes reactances and time constants, armature and rotor circuit resistances, and the saturation characteristic. Several procedures have been developed to pass from steady state and short circuit test data to the electrical parameters needed in the transient solution of a machine [8] - [10]. Frequency response tests have received much attention during the last 20 years; the methods proposed to obtain parameters of the d- and q-axis equivalent circuits are based on standstill frequency response (SSFR) [11] - [14], and on-line frequency response [15], [16]. Some techniques have also been developed to account for saturation effects [17].

Although these tests and the corresponding procedures can also be used to obtain electrical parameters of an induction machine, data conversion procedures for these machines are usually performed from different specifications [18]. This panel presentation is aimed at summarizing the most important procedures proposed up to date to obtain the parameters needed for representing ac rotating machines in transients simulations. II. REFERENCES [1] [2]

[3] [4]

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[5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18]

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