OPTIMAL PERFORMANCE OF DOUBLE FED INDUCTION GENERATOR IN WINDMILLS

Double fed induction generator with two pair of poles (DFTPPIG) can be combined with the windmill such that it works only at one power chara cteristic with the optimum value of tip speed ratio (TSR). With such c onstruction one does not have to care on variable speed gearbox and va riable pitch blade. Adjusting the magnitude of the rotor's voltage, an gle between the rotor's ems and voltage and number of poles of the DFT PPIG in relation to the speed of the wind (shaft) it is possible to ob tain the optimum value of TSR for wide range of speed for given windmi ll at the fixed position of the propellers.