Pitch systemCopyright: © CWD
Advanced drivetrain simulation for wind turbines
Advanced drive train simulation models for wind turbines: Pitch system Modern variable speed wind turbines have adjustable rotor blades for power control. Today, for safety reasons one pitch drive per blade is required to control them independently, so that even in cases of the loss of one pitch drive, the system can still be braked aerodynamically. This technical requirement enables a dynamical adjustment of each rotor blade to an optimal position over rotation. The potential in increasing energy efficiency at low wind speeds as well as the leveling and load reduction at high wind speeds is not fully exploited in the series today; corresponding implementations to the pitch control are currently being pursued. For then, analysis of the increasing pitch drive dynamics have to be carried out. Therefore, detailed models have to be developed and the coupled aeroelastic and torsional dynamics of the rotor blade have to be integrated into the system models. This will be important if considering the current trend of increasing rotor blade length, particularly for onshore wind turbines.
One goal of the project "Erweiterte Antriebsstrangsimulation für Windenergieanlagen”, therefore, is the improvement of existing simulation tools for the description of drive technology in wind turbines. Based on existing knowledge and embedded in current models, the development focuses on the following points:
- Extension of the aeroelastic models and system-wide analysis of the pitch drives
- Validation of the models by measurements on a wind turbine of 2.2 MW class
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