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Development of a Variable Electromotive-Force Generator for a Wind Turbine

[+] Author Affiliations
W. D. Zhu, N. Goudarzi, X. F. Wang, P. Kendrick

University of Maryland, Baltimore County, Baltimore, MD

Paper No. IMECE2012-88602, pp. 1249-1256; 8 pages
doi:10.1115/IMECE2012-88602
From:
  • ASME 2012 International Mechanical Engineering Congress and Exposition
  • Volume 4: Dynamics, Control and Uncertainty, Parts A and B
  • Houston, Texas, USA, November 9–15, 2012
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4520-2
  • Copyright © 2012 by ASME

abstract

To improve the power production and the overall operational range of a wind turbine, a modified generator called a variable electromotive-force generator (VEG), which has an adjustable overlap between the rotor and the stator, is proposed. Theoretical analysis of employing a VEG relies on numerous assumptions about the aerodynamic and electromagnetic models of a wind turbine drivetrain. In this work, a novel test stand for a VEG prototype, including a 12 V DC synchronous generator with an adjustable overlap between the rotor and the stator, a 700 W electric motor as the prime mover, and a stepper motor as the actuator for an active control system, is designed and fabricated. The performance of the VEG prototype is studied experimentally, and the active control system to adjust the overlap between the rotor and the stator based on the desired output power at different input speeds is developed. A variable factor is used to condition the desired and real output powers to improve the stability of the control system. The results show that decreasing the overlap between the rotor and the stator of the generator at low speeds results in decreasing the torque loss of the generator and increasing the rotational speed of the generator rotor. Having a VEG in a wind turbine operating under a lower input power than that of a regular generator means the VEG can start working at a lower wind speed than the current cut-in speed of the regular generator.

Copyright © 2012 by ASME

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