The add-on module alaska/Wind consists of a series of special modelling components and add-on programs. The additional modelling components integrate seamlessly into the modeling environment of the alaska/ModellerStudio and work perfectly with both the basic components and components of other alaka expansion modules.
Self-developt aerodynamics library
For the calculation of the dynamic wake and stall effects, the methods commonly used in the wind branch are implemented. Turbulent wind is generated with a separate preprocessor. For offshore applications, methods for the calculation of waves and currents are implemented.
Modelling components for wind and water forces
Special model components are available for the modelling of wind and water forces. These components calculate the forces acting on the rotor blades, nacelle, tower and foundation structures and provide information on the ambient conditions.
Parameterized and expandable basic simulation model
Based on a completely parameterized and ready-to-use basic simulation model, the user develops his own simulation projects. In the simplest case, the modelling effort is limited to generating customer-specific blade and tower models with the WORKBENCH alaska/Wind and specifying a few geometric parameter values, e. g. for cone and tilt angles and mass properties for main assemblies. alaska/Wind also offers the possibility to implement very extensive MKS model extensions in the simulation model with the modelling capabilities of the alaska/ModellerStudio.
Control of Simulation Models
alaska/Wind provides a number of possibilities for describing and coupling controls and operational management of wind turbines. The user can use externally defined controllers via a DLL interface. A sample controller supplied with the basic simulation model (as source code and SIMULINK model) can serve as a template for such a controller. In addition to this DLL interface, direct coupling with Matlab/SIMULINK or the use of a system model directly in a SIMULINK model is also possible. It is possible to export SIMULINK controllers as DLLs via SIMULINK Coder and use them with the alaska/Wind simulation model. Controllers for the software Bladed (discon. dll) can be used directly.
Generators for stochastic wind and wave data
The programs WindSim and WaveSim are available for generating stochastic air and water movements. These programs are preprocessors that calculate turbulence data and stochastic water movements according to industry standard methods, taking into account statistical constraints. It is also possible to process wind data from other sources. This can be measured wind or wind generated with other generators (NRELs TurbSim, WAsP IEC Turbulence Simulator).
The WORKBENCH is a separate program for alaska/Wind. It is mainly used for the interactive or command line controlled generation of rotor blade and tower simulation models. For aerodynamic profiles, the WORKBENCH calculates coefficients for dynamic stall models (Beddoes-Leishman). The profile data and the calculated stall coefficients are graphically displayed and can be adjusted interactively. The WORKBENCH can also be used to parameterize submodels, generate turbulence files, compile plant simulation models and others.
Framework for efficient load case calculation
alaska ParameterSets are used to define different load variants of a simulation model. Different variants are stored in separate xml-formatted files. These files can contain a few or several hundred different variants - so called load cases. These variants are either calculated interactively with the alaska/ModellerStudio or completely automated with alaska/Batch or using alaska/DistributedComputation.