Abstract: Categorizes three direct-axis and four quadrature-axis models, along with the basic transient! ]# W, J4 G3 d# l# y& t: S
reactance model. Discusses some of the assumptions made in using various models and presents the F( a3 H6 N4 k/ dfundamental equations and concepts involved in generator/system interfacing. Covers, generally, the various8 T- Z0 }; e- D: _
attributes of power system stability, recognizing two basic approaches. The first is categorized under large( t( ]& m: X, i) N ?5 @
disturbance nonlinear analysis; the second approach considers small disturbances, where the corresponding5 N7 `( V( f- `% L1 W
dynamic equations are linearized. Applications of a range of generator models are discussed and treated. The& W6 h) m& I( {) d/ ?
manner in which generator saturation is treated in stability studies, both in the initialization process as well as ) s; e+ ^, |- t2 C# Eduring large or small disturbance stability analysis procedures is addressed. Saturation functions that are5 Z9 i+ O* V4 Q7 W5 N
derived, whether from test data or by the methods, of finite elements are developed. Different saturation' X" K- H& V: K, I/ |, k/ j$ r
algorithms for calculating values of excitation and internal power angle depending upon generator terminal 5 ?3 [( a/ W' v/ @5 y+ uconditions are compared. The question of parameter determination is covered. Two approaches in accounting b& L, o) X4 F* e3 F' `; wfor generator field and excitation system base quantities are identified. Conversion factors are given for * z. N; w, V9 U! `5 Ztransferring field parameters from one base to another for correct generator/excitation system interface# B( e6 ~0 Y! H# e: J; P
modeling, Suggestions for modeling of negative field currents and other field circuit discontinuities are - X+ a+ w7 q( X4 `4 Lincluded.6 M1 n1 M$ T4 r' P; y. o
Keywords: modeling practices, saturation practices, stability data determination and application, synchronous 7 ]1 Q- y' ]7 Ygenerator stability models