Hydraulic drive train technology offers a radical alterative, enabling both variable rotor speed and constant generator speed at all times. It allows the use of standard electrically excited synchronous generators directly connected to the grid without a frequency converter. An innovative concept replaces the common gearbox and frequency converter in conventional wind turbines with a hydrostatic drivetrain using fixed-displacement pumps and fixed and variable-displacement motors. PDF format This file type includes high resolution graphics and. Wind turbines that swap traditional mechanical drive trains for hydraulic drive trains could potentially be lighter, more reliable and less expensive than those in the field today. wind energy market includes approximately 30,000 aging turbines; 7,000 of which are out of service for. A wind power system integrates different engineering domains, i. aerodynamic, mechanical, hydraulic and electrical. By utilising fluid power to translate the rotor's mechanical energy into a more controllable and flexible medium, these systems can. In this paper, a thorough review of hydraulic technology application in wind tions, and the potential problems. The flow response, angular velocity, and pressure of the system.