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IEEE 421.5

Recommended Practice for Excitation System Models for Power System Stability Studies

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Organization: IEEE
Publication Date: 1 January 1992
Status: inactive
Page Count: 57
scope:

When the behavior of synchronous machines is to be simulated accurately in power system stability studies, it is essential that the excitation systems of the synchronous machines be modeled in suffcient detail, see [12] 1 . The desired models must be suitable for representing the actual excitation equipment performance for large, severe disturbances as well as for small perturbations.

A 1968 IEEE Committee Report (see [6]) provided initial excitation system reference models. It established a common nomenclature, presented mathematical models for excitation systems then in common use, and deÞned parameters for those models. A 1981 report (see [7]) extended that work. It provided models for newer types of excitation equipment not covered previously as well as improved models for older equipment.

This document, based heavily on the 1981 report, is intended to again update the models, provide models for additional control of features, and formalize those models in a recommended practice. To some extent, the model structures presented in this document are intended to facilitate the use of Þeld test data as a means of obtaining model parameters. The models are, however, reduced order models and do not represent all of the control loops on any particular system. In some cases, the model used may represent a substantial reduction, resulting in large differences between the structure of the model and the physical system.

The excitation system models themselves do not allow for regulator modulation as a function of system frequency, an inherent characteristic of some older excitation systems. The models are valid for frequency deviations of ± 5% from rated frequency and oscillation frequencies up to about 3 Hz. These models would not normally be adequate for use in studies of subsynchronous resonance or other shaft torsional interaction problems. Delayed protective and control functions that may come into play in long term dynamic performance studies are not represented.

A sample set of data (not necessarily typical) for each of the models, for at least one particular application, is provided in Appendix I. A suffix, "A," is used with the version of all models described in this report to differentiate them from previous models.

1 The numbers in brackets correspond to those of the references in Section 2.

Document History

May 15, 2016
Recommended Practice for Excitation System Models for Power System Stability Studies
This document provides mathematical models for computer simulation studies of excitation systems and their associated controls for three-phase synchronous generators. The equipment modeled includes...
April 1, 2008
Recommended Practice for Excitation System Models for Power System Stability Studies
Foreword  Excitation system models suitable for use in large-scale system stability studies are presented in this recommended practice. With these models, most of the excitation systems currently in...
October 25, 2005
Recommended Practice for Excitation System Models for Power System Stability Studies
Foreword  Excitation system models suitable for use in large-scale system stability studies are presented in this recommended practice. With these models, most of the excitation systems currently in...
IEEE 421.5
January 1, 1992
Recommended Practice for Excitation System Models for Power System Stability Studies
When the behavior of synchronous machines is to be simulated accurately in power system stability studies, it is essential that the excitation systems of the synchronous machines be modeled in...

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