Speed and position sensor-less maximum power point tracking control for wind generation system with squirrel cage induction generator

Abstract

Wind energy is a significant and powerful resource. It is safe, clean, and abundant. Variable speed power generation for a wind turbine is attractive, because maximum efficiency can be achieved at all wind velocities. However, this system requires a rotor speed sensor for vector control purposes, which increases the cost of the system. In this paper, a technique is proposed for the position and speed sensor-less wind generation system using the electromotive voltage observer to estimate the rotor position and the full-order observer to estimate the rotor speed and the windmill output torque. The optimal operation speed to which the windmill output power is maximized is determined, and the optimal rotor flux to which the generator loss is minimized for the generator efficiency improvement is also determined. The position and speed sensor-less maximum power point of the wind power generation system is controlled by using the above estimated values, optimized operation speed and optimized rotor flux. The effectiveness of the position and speed sensor-less control of squirrel cage induction generator is verified by simulations for the wind power generation system. © 2006 IEEE.