Power control of a wind turbine using an electrohydraulically controlled active pitch control mechanism

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.