| In this paper, a suit of circuits was presented, inclusive of drive, cushion, absorbing and protecting circuits of PWM four quadrants commutation for wind power turbine, based on an analysis of commutating circuits and the problems arising during operation before. The necessity and importance of these circuits were discussed in particular. The circuits designed by Protel software and the important parameters were also given, which were used to improve the reliability of the commutating system for the wind power turbine and to decrease losses during operation. |