METHOD FOR EFFICIENCY OPTIMIZATION OF A WIND GENERATOR BY CONTROLLING THE ELECTRICAL GENERATOR

摘要

A method for efficiency optimization of a wind generator by controlling the squirrel cage induction generator that simultaneously achieves maximum efficiency of the wind turbine (wind mill) and maximum efficiency of the electric generator through the minimization of its electric loss. Additionally, expansion of the exploitable wind speed region is accomplished through the reduction of the cut-inspeed at which the wind system starts to provide power to the grid. This method is implemented by appropriately controlling the power rectifier and without requiring the measurement of the wind speed. Input to the control scheme is the rotational speed of the electric generator. The control scheme comprises two controllers that, for any wind speed, they provide the optimal reference field and torque stator current components of the induction generator which are determined through optimal conditions. Main advantages of the control system are the quick response so as it can follow the fast changes of the wind speed and also the simple implementation and the easy installation.