Modelica wind turbine models with structural changes related to different operating modes

Investigation of large technical systems by simulation of long time periods requires effective methods. One possibility to handle such problems is the implementation of simulation models which use suitably simplified descriptions of the real behaviour of technical systems. In some cases, however, operating modes with highly dynamic processes have to be investigated. These processes may occur suddenly within long time periods of behaviour with none or very low dynamics, which can be considered as static behaviour. In such cases, it would be advantageous to be able to switch from the simplified model mentioned above to a more complex model describing the real behaviour in more detail. In the paper, four different Modelica models for wind turbines are presented. On the one hand, two static models the "simple static model" and the "static mechatronic mode" - are shown representing two different instances of a simplified behaviour. On the other hand, two dynamic models the "mechanical mode" and the "dynamic mechatronic model" - are presented which describe the dynamic behaviour of a wind turbine in more detail. Furthermore, a method will shortly be proposed to exchange one model with another one at certain points in time (see also [5]). Such structural changes allow the application of that particular model of behaviour which suits the current situation best. Using this method, the simulation of a complex mechatronic system like a wind turbine can very effectively be carried out. Additionally, some simulation results will be given to show the advantage of the method proposed.