Modeling of Saturated Synchronous Generator Based on Steady-State Operating Data

Abstract

This paper deals with modeling of the saturated salient-pole synchronous machines using analytical saturation model obtained based on measurements of steady-state variables. Two different saturation models are considered in order to investigate impact of the reciprocity property of the mutual inductance between d-and q-axis on transients of the saturated machine. It is shown that the simpler saturation model, which is obtained by neglecting the reciprocity property condition, may be used to model saturation in both steady-state and transient conditions. The developed model of the saturated machine is validated with measurements performed on the 34-MVA hydroturbine generator.

Condition-Monitoring System for Identification and Representation of the Capability Diagram Limits for Multiple Synchronous Generators in a Hydro Power-Plant

“…There are a lot of models of synchronous machines reported in the literature [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] that are based on the two-axis theory. All of those models were developed for a specific purpose or application and they have their advantages and disadvantages.…”

“…It is known that the the synchrous reactances are changing with the operating point of the generator which has been reported in literature [6][7][8]22,[41][42][43][44][45][46][47][48][49].…”

“…A smaller number of papers deal with the steady-state models of the synchronous machines [45][46][47][48][50][51][52][53][54]. An interesting approach is presented in [6][7][8] where the dynamical model of the synchronous generator is identified based on the measurement of the steady-state operating points during on-grid operation. One of the purposes of the steady-state models is the identification of the capability limits in the P-Q diagram.…”

Steady-state synchronous machine model which incorporates saturation and cross-magnetization effects

“…There are numerous models of the synchronous machines for steady-state [4]- [7] but there are few of them that are able to accurately describe the steady-state operation for a wide range operation in both overexcited and underexcited regimes [8] especially for salient pole synchronous generators [9], [10]. Some of the models are very complicated and complex and require complicated identification methods [5]- [7], [11] in order to estimate model parameters.…”

Generator saturation modelling using three saturation models

“…It has long been recognized that the magnetic saturation of synchronous machines play an important role in power system stability studies [2]- [3]. In power system dynamic studies, the synchronous generator is commonly represented using the dqaxis.…”