Problem: Avoiding failure of the braking mechanisms in wind turbine in hurricane conditions
The study aims to analyse the structural effects and operational characteristics of wind turbines during hurricane conditions, where wind speeds could range between 50-58 m/s for a category 3 hurricane . A detailed study of wind turbine operation at high velocity will be carried out from available literature, more specifically, the braking systems being employed in the nacelle of the wind turbine and the related susceptibility to fire and mechanical failures. Data available from knowledge repositories such as QUT library, IEEE Xplore will be used to obtain qualitative data such as pyrolysis tests, mechanical gearbox specifications and failure modes. The following are specific goals to help guide us to a conclusion:
1. Current practices in wind turbine braking
2. Accumulate data for available braking technologies viable for offshore operations4
3. Establish the durability of the wind-speed and position sensors on the wind turbine during abnormally high wind speeds, and methods of tackling problems such as icing or data resolution.
4. Establish effects of high wind speeds on the pitch and yaw control
5. Compare motorized pitch control of the blades with hydraulic pitch control for high wind speeds
6. The need for cooling systems during high speed operation
7. Contribution of the gear box in braking/slowing down the rotations per minute
8. Viability of Bladed software in simulating operational characteristics.
9. Lubrication needs for high rpm operation
2. Data Needs
1. Costs associated with periodic wind farm maintenance
2. Identify failure modes of each assembly
3. Normal operating conditions for pitch and yaw control systems
4. Costs associated with upgrades and modification of typical wind turbines
5. Variation of turbine rpm between exterior wind turbines and central turbines
3. Analysis techniques
In an offshore wind farm, it is crucial to maintain the integrity of the entire system as repairs and maintenance is quite often difficult and the expenses involved could negate the returns on investment for the stakeholders. To prevent a brake failure in wind turbines it is important to analyse the chain of events that could potentially lead to such an event. The brake failure event in Denmark in 1998 will be taken as a case study to acquire insight on the mechanisms of wind turbine brake failure. At hurricane force winds, even minimal imperfections may magnify into substantially abnormal operation...