International Journal of
Physical Sciences

  • Abbreviation: Int. J. Phys. Sci.
  • Language: English
  • ISSN: 1992-1950
  • DOI: 10.5897/IJPS
  • Start Year: 2006
  • Published Articles: 2572

Full Length Research Paper

Maximum power point tracking of variable speed wind energy conversion system

Shahab Sajedi*, Fatemeh Khalifeh, Tayebeh Karimi and Zeynab Khalifeh
Kharg Branch, Islamic Azad University, Kharg, Iran.
Email: [email protected]

  •  Accepted: 01 August 2011
  •  Published: 23 November 2011



This paper proposes a simple method to maximum power control of wind turbine and induction generator connected with two back to back voltage source converters to grid. Machine currents are controlled by indirect vector control method. In this method, generator side converter controls the maximum excitation (air gap flux) by machine's d-axis current and controls generator torque by machine's q-axis current. Induction generator speed is controlled by tip speed ratio (TSR) upon the wind speed variations in order to generate the maximum output power. Grid side converter regulates the DC link voltage and injective active power by d-axis current and regulates the injective reactive power by q-axis current using simple control method P-Q. Simulation results show that the proposed method operates correctly.


Key words: Maximum power control, variable speed wind system, squirrel cage induction generator, vector control.