In order to achieve power steering function in fuel cell bus, an electrohydraulic system is proposed, where the pump is directly driven by a DC motor through an axis coupler.

Pitch angle control system can change pitch, accordingly regulate the rotational speed and output power by adjusting blade incidence of wind-driven device.

Under the background, on the basis of the study of brushless doubly-fed machine and wind power technology, control system for wind-driven brushless doubly-fed generator was studied in this paper.