Effect of wind parks with doubly fed asynchronous generators on small-signal stability

• Published in: Electric power systems research Vol. 79; no. 1; pp. 190 - 200
• Main Authors: Tsourakis, G., Nomikos, B.M., Vournas, C.D.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 2009; Elsevier
• Subjects: Applied sciences; Direct energy conversion and energy accumulation; Doubly fed asynchronous generator (DFAG); Electrical engineering. Electrical power engineering; Electrical machines; Electrical power engineering; Exact sciences and technology; High voltage or high current generators; Inter-area oscillations; Miscellaneous; Power networks and lines; Regulation and control; Small-signal stability; Various equipment and components; Wind power; Inter-area oscillations; Small-signal stability; Wind power; Doubly fed asynchronous generator (DFAG); Asynchronous generators; Small signal behavior; Control system; Interconnected power system; Voltage control; Tuning; Wind energy; Electromechanical oscillation; Control loop; Electrical network; Double supply machine; Software
• ISSN: 0378-7796; 1873-2046
• DOI: 10.1016/j.epsr.2008.05.018

This paper investigates modes of response introduced by wind parks with doubly fed asynchronous generators (DFAGs), as well as their impact on electromechanical oscillations in interconnected power systems. A DFAG model with detailed control loops is used, as it appears in the literature and commercial software. It is shown that under certain conditions and without appropriate controller tuning the voltage/VAR control loop of an interconnected DFAG tends to instability. Furthermore, the effect of increased penetration of DFAGs on the stability of inter-area oscillations in a small typical power system is examined. It is shown that the effect is generally favorable, but there are cases where the inter-area mode is less damped or can even be destabilized. Improved controller tuning to avoid instability in the latter case is proposed.