Understanding the unbalanced-voltage problem in wind turbine generation

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Most wind turbines are equipped with line-connected induction generators. Induction generators are very attractive as wind turbine generators due to their low cost, ruggedness and the need for little or no maintenance. At constant frequency, the induction generator operates in a small range of speeds and, therefore, it operated with a small range of slips with respect to synchronous speed. Compared to a synchronous generator, an induction generator provides lower stiffness, thus alleviating the mechanical stress. In a weak power system network, an unbalanced load at the distribution lines can cause unbalanced voltage conditions. If an induction generator is connected ... continued below

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Muljadi, E.; Butterfield, C.P.; Batan, T. & Yildirim, D. February 28, 2000.

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Most wind turbines are equipped with line-connected induction generators. Induction generators are very attractive as wind turbine generators due to their low cost, ruggedness and the need for little or no maintenance. At constant frequency, the induction generator operates in a small range of speeds and, therefore, it operated with a small range of slips with respect to synchronous speed. Compared to a synchronous generator, an induction generator provides lower stiffness, thus alleviating the mechanical stress. In a weak power system network, an unbalanced load at the distribution lines can cause unbalanced voltage conditions. If an induction generator is connected to an unbalanced voltage, the resulting stator current will be unbalanced. The unbalanced current creates unequal heating (hot spots) on the stator winding. The heat may increase the winding temperature, which degrades the insulation of the winding, i.e., the life expectancy of the winding. Unbalanced currents also create torque pulsation on the shaft resulting in audible noise and extra mechanical stress. This paper explores the unbalanced voltage problem in induction generators. The levels of unbalance and the loads are varied. Experimental and predicted results are presented in this paper.

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  • 1999 IEEE Industry Applications Society Annual Meeting, Phoenix, AZ (US), 10/03/1999--10/07/1999

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  • Report No.: NREL/CP--500-26338
  • Grant Number: AC36-99GO10337
  • Office of Scientific & Technical Information Report Number: 752404
  • Archival Resource Key: ark:/67531/metadc703516

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  • February 28, 2000

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  • Sept. 12, 2015, 6:31 a.m.

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  • March 31, 2016, 8:37 p.m.

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Muljadi, E.; Butterfield, C.P.; Batan, T. & Yildirim, D. Understanding the unbalanced-voltage problem in wind turbine generation, article, February 28, 2000; Golden, Colorado. (digital.library.unt.edu/ark:/67531/metadc703516/: accessed August 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.