Abstract
In this paper, a non-linear 7th order dynamic model and a linearized 3rd order dynamic model of a synchronous generator connected to an infinite bus are presented and compared in details. Parameters and equations of the both models are explained and summarized. They represent a useful starting point for work in areas of synchronous generators’ construction, analysis, control systems design and synthesis. Novelty of this work represents a detailed research of applicability of the linearized model in an entire operating range. Established theoretical conclusions were confirmed with numerical results. Restrictions of utilizing the linearized model are presented. On a basis of the analysis for the synchronous generators of different power, their applicability with feasibility and accuracy was evaluated by certain objective criteria.DOI: http://dx.doi.org/10.5755/j01.eie.22.4.15905
Highlights
The synchronous generators (SG) are most important sources of electric energy
The most thorough SG’s model is the “non-linear 7th order d-q model” (N7OM), where magnetic coupling of stator, field- and damperwindings is a function of a position and saturation of a rotor
Main disadvantage of N7OM is its un-suitability for an analytical dynamic analysis and control system design [11]
Summary
The synchronous generators (SG) are most important sources of electric energy. there is a distinct interest in adequate static and dynamic models of SG. The windings’ equations are transformed and presented in a form of a non-linear state-space model Between these two extreme models, we can find many SG’s models with a different grade of complexity. A goal of the presented work is to explore applicability of L3OM involving certain operating areas and limits in where it can replace N7OM without significantly lacking accuracy. Such description helps to select a proper model for case-by-case scenarios.
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