Hydrostatic power transmission between the rotor of a wind turbine and the generator, which can be placed on the ground, is a way to reduce the cost of installing a turbine, reducing the mass placed at height. The article shows the ability of a hydrostatic transmission to cope with a disturbance due to the change in the air flow that drives the turbine rotor. When increasing the air flow, which would normally lead to an increase in the drive speed of the electric generator, by adjusting the geometric volume of the hydraulic pump connected to the wind rotor with a PID regulator, the drive speed of the generator is kept constant. The load of the electric generator is also simulated hydraulically.
The paper presents the numerical simulation of a horizontal axis wind turbine and the electrohydraulic system that maintains the constant frequency of the alternating current generator regardless of its load or the variation of the wind speed. As a starting point, the turbine parameters such as speed, torque and power were determined in relation to the angle of attack of the blades. In order to keep the frequency of the alternating current generator constant, the solution that adjusts the angle of attack of the blades was chosen using the active pitch control mechanism. This mechanism is controlled by a PID type controller, by controlling a proportional directional control valve that feeds the 3 orbital hydraulic motors, which are coupled in series so that the angle of the three blades is identical.
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