SiWEC (Simulation of Wind Energy Converters) is a simulation code  developed in-house to calculatate design loads of a wind energy converter (WEC). The WEC is modelled as a multi body system. The code has a strictly modular structure of coupled sub modules that constitute tower, blade, generator, pitch actuator modules etc. This  modern tool uses state-of-the-art blade element momentum theory with proper aerodynamic corrections and detailled foundation-soil interaction models for all current onshore and offshore foundations.

Through use of modern mathmatical solvers a precise and in particular fast calculation of loads is possible that is necessary for new WEC development. To modell flexible bodies SiWEC is capable to utilize custom chosen number of eigen modes or externally developed 3D modes. This leads to a particular realistic representation, e.g., of blade dynamics. The load calculation uses wind models consistant with guidelines based on Kaimal or Mann models.

A special optional asset is a link to a data base that allows for a central data management. Thefore a close cooperation between designers and analysts is ensured that enhances internal quality control. In addition, the development and optimization cycles (iterations) become shorter.

Further SiWEC has interfaces to our large number of tool boxes for analyses, evaluation and visualization. Online or offline monitoring of simulation could be done by the implemented visual user interface.

In conclusion, SiWEC constitutes a complete and fast tool for development of new turbines and also optimizeng  existing wind energy converters.

Code-to-code comparison has been performed for our in-house simulation tool by Paul Schünemann (University Rostock) within the “Offshore Code Comparison Collaboration Continuation with Correlation” (OC5) project and SIWEC has passed the challenge. Results are published under NREL/CP-5000-70878. Code-to-code comparison is a valuable instrument to validate simulation tools and assure quality of software development.

Graphical elements allow for online or offline inspection and hence, additional quality checks.

Development of a small wind turbine

There is a strong interest in small wind energy turbines. However, small turbines have there own challenges that hampers the success in the market. Utilizing concentrated efforts of experience, knowledge, and innovative skills as well as close cooperation with the University of Rostock, Windrad Engineering presently develops a small vertical axis turbine. In order to realistically describe the special features of the vertical axis rotors special in-house tool have been developed. In the framework of a ZIM grant a first prototype has been build. This is now the basis of further optimization.