On the stability of power systems containing doubly fed induction generator-based generation

• Published in: Electric power systems research Vol. 78; no. 9; pp. 1477 - 1484
• Main Authors: Elkington, Katherine, Knazkins, Valerijs, Ghandhari, Mehrdad
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.09.2008; Elsevier
• Subjects: Applied sciences; DFIG; Doubly fed induction generator; Eigenvalues; Electric power plants; Electrical engineering. Electrical power engineering; Electrical machines; Electrical power engineering; Exact sciences and technology; large-scale; Miscellaneous; Non classical power plants; one-axis; One-axis model; oscillations; Power networks and lines; Power system; Stability; Third order model; wind farm; Wind power plants; Power system; Stability; Doubly fed induction generator; One-axis model; Third order model; Eigenvalues; DFIG; Windfarm; Induction generators; Eigenvalue; State space method; Electrical network; Double supply machine; Numerical simulation; Mathematical model
• ISSN: 0378-7796; 1873-2046; 1873-2046
• DOI: 10.1016/j.epsr.2008.01.006

This article is concerned with the impact of large-scale wind farms utilising doubly fed induction generators on the stability of a general power system. Inspection of the eigenstructure of the power system provides a foundation for assessing the impact, which is then quantified by means of detailed numerical simulations. Simplified state-space models are used to describe the dynamics of the generators in a very simple system, whose network is described by algebraic relations. A third order model is derived for a doubly fed induction generator. Mathematical models are then used to identify the behavioural patterns of the system when it is subject to disturbances. Eigenvalue analysis reveals some interesting properties of the system for small disturbances, and shows that the addition to a power system of doubly fed generators, such as those in wind farms, improves the response of the system to small disturbances. However, numerical simulations show that it can have an adverse impact after larger disturbances.