Safety-factor calibration for wind turbine extreme loads

Probabilistic Analysis of List Data for the Estimation of Extreme Design Loads for Wind Turbine Components

Robust estimation of wind turbine design loads for service lifetimes of 30 to 50 years that are based on field measurements of a few days is a challenging problem. Estimating the long-term load distribution involves the integration of conditional distributions of extreme loads over the mean wind speed and turbulence intensity distributions. However, the accuracy of the statistical extrapolation...

Wind Simulation for Extreme and Fatigue Loads

Målinger af atmosfærisk turbulens afviger fra en Gaussisk proces, specielt hvad ang̊ar hastighedsændringer over sm̊a tidsskridt, hvor halerne p̊a sandsynlighedsfordelingen snarere er ekspotentielle end Gaussiske. Tælleprincipperne for ekstreme hændelser og eksistensen af kaskader af hændelser gennemg̊as. Empiriske ekstremstatistikker findes i overensstemmelse med Rices overskridelsesteori, n̊ar ford...

Damping Wind and Wave Loads on a Floating Wind Turbine

Offshore wind energy capitalizes on the higher and less turbulent wind speeds at sea. To enable deployment of wind turbines in deep-water locations, structures are being explored, where wind turbines are placed on a floating platform. This combined structure presents a new control problem, due to the partly unconstrained movement of the platform and ocean wave excitation. If this additional com...

The Performance of Wind Turbine Smart Rotor Control Approaches During Extreme Loads

Modelling of transient wind turbine loads during pitch motion

In connection with the design of wind turbines and their control algorithms, the transient loads, especially generated by time varying blade loads, are very important. In the Blade Element Momentum method, the most widespread tool in the wind turbine industry, the time constants necessary to describe these problems are not an inherent part of the model. In the present study two different approa...