IEC WIND TURBINES – PART 1: DESIGN REQUIREMENTS. You may have heard that IEC defines wind turbine classes with labels like IIIB, where the roman number refers to a reference wind speed and the index letter. IEC. Second edition. Wind turbine generator systems –. Part 1 : Safety requirements. Aérogénérateurs –. Partie 1: Spécifications de sécurité.
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To verify that a wind turbine belongs to a give wind turbine class, it must be proven safe under a set of predefined load cases. March Learn how and when to remove this 16400-1 message.
Here, the main principle is that local wind conditions must not exceed those of the models used for turbine classification. Turbine designers will typically model turbine vibrations and dynamic forces on critical components by aeroelastic simulation programs such as HAWC2. The IEC turbine safety standard.
Wind conditions are specified by extreme wind speed, vertical wind shear, flow inclination, turbulence and rare gust-like events. To facilitate comparison with the NTM model, the IEC standard suggests the so-called effective turbulence intensity, which is an iecc turbulence independent on wind direction and expected to cause the same fatigue damage as variable turbulence in winds from all directions.
Turbine wind class is just one of the factors needing consideration during the complex process of planning a wind power plant.
Webarchive template wayback links Articles lacking in-text citations from March All articles lacking in-text citations Use British English Oxford spelling from January Small wind turbines are defined as being of up to m 2 swept area and a somewhat simplified IEC standard addresses these. The siting engineer must iecc the safety of the deployed turbines. IEC started standardizing international certification on the subject inand the first standard appeared in It is, however, simpler to apply the site-assessment rules specified in another chapter of IEC In principle, the aeroelastic simulation could be repeated with local wind conditions at specific turbine positions.
Wind turbines are designed for specific conditions.
The effective turbulence intensity includes added turbulence from wakes of neighbour turbines, and a simple wake turbulence model is provided. Archived from the original on 7 October This article includes a list of referencesrelated reading or external linksbut its sources remain unclear because it lacks inline citations.
The is a set of design requirements made to ensure that wind turbines are appropriately engineered against damage from hazards within the planned lifetime. In addition, 61400- accumulated fatigue damage caused by stochastic forcing is evaluated for a design life time of twenty years and compared to the material strength. For small wind turbines the global industry has been working towards harmonisation of certification requirements with a “test once, certify everywhere” objective.
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During the construction and design phase assumptions are made about the wind climate that the wind turbines will be exposed to. Depending on the load case, the wind interacting with the turbine is either deterministic or a pseudo-random wind field with realistic turbulence characteristics. Some of these standards provide technical conditions verifiable by an independent, third partyand as such are necessary in order to make business agreements so wind turbines can be financed and erected.
Retrieved 7 October National Renewable Energy Laboratory participates in IEC standards development work,   and tests equipment iev to these iecc.
Aeroelastic simulations are processed for all IEC load cases, and turbine safety is verified for each of the deterministic load cases. This is the definition in IEC edition 2. Wind classes determine which turbine is suitable for the normal wind conditions of a particular site. Please help to improve this article by introducing more precise citations.
An update for IEC is scheduled for The common set of standards sometimes replace the various national standards, forming a basis for global certification.
This imposes simple limits on fifty-year extreme wind, flow inclination and wind shear, see Figure 1, whereas turbulence assessment is more complicated. It is also possible to use the IEC standard for turbines of less than m 2 swept area.
Retrieved from ” https: Variable atmospheric stability, unsteady wind, and directional variation of upwind terrain will introduce variations in observed turbulence intensity.
In complex terrain the wind profile is not a simple increase and additionally a separation of the flow might occur, leading to heavily increased turbulence.