DESIGN OF OPTIMUM TORQUE METHOD FOR TRACKING THE MAXIMUM POWER POINTOF VARIABLE SPEED WIND TURBINE

Optimum torque based maximum power point tracking (MPPT) method is widely used in high power wind turbines. In this paper a proposed optimum toque method is developed and applied to the wind turbine system. The diversity of maximum power point tracking methods are developed, all those methods are vary in implementation, cost, complexity and faster tracking speed, in all of that optimum torque is the more accurate for the variable speed wind turbines. This optimum torque method involves a generator torque control system and it is responsible for tracking the reference torque given by MPPT control law. Initially optimum torque method is developed and then, proportional integral controller is used. Numerical simulations are carried out in MATLAB platform and the obtained results are of two types, the first one represents the step change in wind velocity and second represents the turbulent wind velocity.