Research Papers

FACTS Controllers for Grid Connected Wind Energy Conversion Systems

[+] Author and Article Information
R. Jayashri

Department of Electrical and Electronics Engineering, RMK Engineering College (Affiliated with Anna University), Kavaraipettai 601 206, Tamilnadu, Indiajairavi4@yahoo.com

R. P. Kumudini Devi

Department of Electrical and Electronics Engineering, College of Engineering, Anna University, Chennai 600025, Indiakumudini@annauniv.edu

J. Sol. Energy Eng 131(1), 011008 (Jan 07, 2009) (7 pages) doi:10.1115/1.3028040 History: Received November 14, 2007; Revised June 01, 2008; Published January 07, 2009

In this paper, the dynamic performance of grid connected wind energy conversion system (WECS) is analyzed in terms of rotor speed stability. The WECS considered is a fixed-speed system that is equipped with a squirrel-cage induction generator. The drive-train is represented as a two-mass model. Results show that for a particular fault simulated, the voltage at the point of common coupling drops below 80% immediately after fault application and exhibits sustained oscillations. The rotor speed of induction generators becomes unstable. In order to improve the low voltage ride-through of WECS under fault conditions and to damp the rotor speed oscillations of induction generator, various flexible ac transmission system (FACTS) controllers such as static VAR (volt ampere reactive) compensator, static synchronous compensator, and unified power flow controller (UPFC) are employed. The gains of these FACTS controllers are tuned with a simple genetic algorithm. It is observed that among the FACTS controllers considered, UPFC is superior not only in regulating the voltage but also in mitigating the rotor speed instability.

Copyright © 2009 by American Society of Mechanical Engineers
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Figure 1

Schematic of a typical WECS

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Figure 2

The simplified two-mass model

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Figure 3

Induction generator transient model

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Figure 4

Single line diagram of the 11-bus radial system

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Figure 5

PCC voltage for a solid three-phase to ground fault of Case 1

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Figure 6

Rotor speed of WECS for a solid three-phase to ground fault of Case 1

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Figure 7

Q variation of a single wind turbine

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Figure 9

PCC voltage for the Case 2 fault

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Figure 10

Rotor speed oscillations of Group 1 machines for the Case 2 fault




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