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Robustness analysis of control strategy in double-fed wind generators

Author(s): L. Y. Chen*, Z. R Jia, Z. Y. Li
Department of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
International Journal of Smart Grid and Clean Energy, vol. 3, no. 1, January 2014: pp. 120-126

ISSN: 2315-4462 (Print)
ISSN: 2373-3594 (Online)
Digital Object Identifier: 10.12720/sgce.3.1.120-126
Abstract: As for power system planning, it is difficult to acquire the detailed model of wind generators to be installed because of the commercial secrets. The mathematical models and typical control strategies of double-fed wind generator (DFIG) were discussed in this paper and the simulation model was established under the environment of power system simulation software DIgSILENT. Then two typical vector control methods applied in DFIG-stator flux oriented control and stator voltage oriented control were compared from two aspects which were eigenvalue and dynamic response, Furthermore, the influence of ignoring some fast dynamic links was also discussed. It can be concluded that when suffered a large disturbance, the proposed two vector control methods are quite different, and it is necessary to consider more detailed model in system stability analysis. On the contrary, when small disturbance is supposed, the results of two control methods are almost identical, which illustrates strong robustness and small deviation by applying general model.
Keywords: Double-fed wind generator, DIgSILENT, stator flux oriented control, stator voltage oriented control, eigenvalue analysis

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