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IEEE 421.5-2016

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IEEE Recommended Practice for Excitation System Models for Power System Stability Studies

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Revision Standard - Active. Excitation system and power system stabilizer models suitable for use in large-scale system stability studies are presented. Important excitation limiters and supplementary controls are also included. The model structures presented are intended to facilitate the use of field test data as a means of obtaining model parameters. The models are, however, reduced order models and do not necessarily represent all of the control loops of any particular system. The models are valid for frequency deviations of ±5% from rated frequency and oscillation frequencies up to 3 Hz. These models would not normally be adequate for use in studies of subsynchronous resonance or other shaft torsional interaction behavior. Delayed protective and control features that may come into play in long-term dynamic performance studies are not represented. A sample set of data for each of the models, for at least one particular application, is provided.
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 the automatic voltage regulator (AVR) as well as supplementary controls including reactive current compensation, power system stabilizers, overexcitation and underexcitation limiters, and stator current limiters. This revision is an update of the recommended practice and includes models of new devices which have become available since the previous revision, as well as updates to some existing models.
Many of those who perform power system simulations require the complete and accurate representation of the particular excitation systems which are being applied. This document provides standardized models such that a free and understandable exchange of data can occur and model programmers can include all excitation systems within the standardized models.

SDO IEEE: Institute of Electrical and Electronics Engineers
Document Number 421.5
Publication Date Aug. 26, 2016
Language en - English
Page Count 207
Revision Level
Supercedes
Committee Energy Development & Power Generation
Publish Date Document Id Type View
Aug. 26, 2016 421.5-2016 Revision
April 21, 2006 421.5-2005 Revision
Aug. 10, 1992 421.5-1992 Revision