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The draft IEC standard 1400-2 for small wind turbines contains a simplified methodology for load measurements on small wind turbines. The validity of this method and the limits of its use were investigated during this project.
Small wind turbines with a rotor diameter of less than 7 m and a rated power of up to about 10kW can play an important role in energy supply in remote areas. Currently approximately 100,000 of these units are installed worldwide and the market relies on mostly small manufacturers for the supply of these machines. These manufacturers often have only limited research and development opportunities, which can lead to poor product quality and limited machine life. In the light of this, the IEC developed a draft international standard for machines of this size, IEC 1400-2, which includes a simplified method for load calculation. This project, aimed at improving the quality and safety of small stand-alone wind turbines was established to check the validity of this method and compare it to a similar standard introduced into the Danish national certification regulation in 1994. To this aim the project was to compare design loads calculated by the draft IEC standard with loads measured on different types of machine at different types of site. The results of this investigation will enable the consortium to contribute to the development of standards and uniform test methods for small stand-alone wind turbines in the EU. It will also provide experimental evidence to validate and improve existing international standards for small, stand-alone wind turbines.
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