The OnWind Modelica Library for OffshoreWind Turbines - Implementation and first results

Abstract

At Fraunhofer IWES a Modelica Library including all major components needed for load calculations of current offshore wind turbines is developed. The li- brary additionally includes models for external condi- tions, like wind, soil and waves, and their respective influence on the structures. The library constitutes a large effort in the creation of a highly coupled multi- physics model with Modelica for an industrial project. The results obtained with this library are compared to the results from the IEA Wind Task 23 project OC31 (Offshore code comparison collaboration). The OC3 project is an international effort to define a set of load- cases and a reference wind turbine that are used to ver- ify simulation systems on a code-to-code basis. In this paper the status and the implemented theories of the individual models at IWES are explained and verifica- tion results are presented and discussed.