THE PRINCIPAL AIM OF THE PROJECT IS THE DEVELOPMENT OF A FIBRE GLASS ROTOR HINGE TO REDUCE THE DYNAMIC LOADS.
The aerodynamic forces acting on blades of a wind turbine generator's (WTG) rotor change during the rotation of the blades because of the misalignment of the rotor centreline with regard to wind direction and by the vertical gradient of the wind speed. These force variations introduce considerable dynamic loads which must be dissipated by the blades and barrel. The study consists of developing a flexible hinge system at the barrel to reduce the effects of these dynamic forces.
For a wind turbine coupled to an independent grid, power production may fluctuate in a random way, and the problem is to control the working load in order to absorb the power produced. This study is developing a technique to allow this.
1. THE AERODYNAMIC FORCES ACTING ON BLADES OF A WTG'S ROTOR ARE CHANGED DURING THE ROTATION OF BLADES BY THE MISALIGNMENT OF THE ROTOR CENTRELINE WITH REGARD TO WIND DIRECTION AND BY THE VERTICAL GRADIENT OF THE WIND SPEED. THESE FORCE VARIATIONS INTRODUCE CONSIDERABLE DYNAMIC LOADS WHICH MUST BE DISSIPATED BY THE BLADES AND BARREL. THE SUBMITTED STUDY CONSISTS IN DEVELOPING A FLEXIBLE HINGE SYSTEM AT BARREL TO REDUCE THE EFFECTS OF THESE DYNAMIC AND CYCLIC FORCES.
2. IN MOST CASES, A WIND POWER PLANT PROVIDES ELECTRICAL POWER TO AN EXTENDED GRID.
THE POWER SUPPLIED MUST CORRESPOND TO GRID CHARACTERISTICS. FOR THIS, THE TURBINE HAS TO HAVE ITS SPEED REGULATED. ANY VARIATION IN MOTOR TORQUE GENERATES AN EQUAL VARIATION IN THE RESISTANT TORQUE OPPOSED BY THE GENERATOR.
FOR A WIND TURBINE COUPLED TO AN INDEPENDENT GRID, THE PROBLEM MAY PRESENT IN TERM OF OPTIMAL CONVERSION OF THE ENERGY. THE POWER PRODUCTION FLUCTUATING IN A RANDOM WAY, THE MATTER IS TO CONTROL THE WORKING LOAD IN ORDER TO ABSORB THE POWER PRODUCED. THE AIM OF THIS STUDY IS TO DEVELOP A PROCESS ALLOWING SUCH A CONDITION.