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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The IEC turbine safety standard – WAsP
Wind classes determine which turbine is suitable for the normal wind conditions of a particular site. List of International Electrotechnical Commission standards. Retrieved from ” https: Turbine classes are determined by three parameters – the average wind speed, extreme year gust, and turbulence. The siting 611400-1 must verify the safety of the deployed turbines.
Each load case is specified by combinations of mode of turbine operation, wind conditions, and load type. Updated by Heidi Serny Jacobsen. Turbine wind class is just one of the factors needing consideration during the complex process of planning a wind power plant. From Wikipedia, the free encyclopedia. This article includes a list of referencesrelated reading or external links 6100-1, but its sources remain unclear because it lacks inline citations.
Languages Deutsch Edit links. Therefore, the IEC standard applies a representative turbulence intensity for turbine classification, which is defined as a high percentile of the expected natural variation. The load type is either an ultimate load, which might instantly damage the turbine, or a fatigue load. In principle, the aeroelastic simulation could be repeated with local wind conditions at specific turbine positions.
Archived from the original on 7 October Retrieved 18 March Wind conditions are specified by extreme wind speed, vertical wind shear, flow inclination, turbulence and rare ief events. In addition, the accumulated fatigue damage caused by stochastic forcing is evaluated for a design life time of kec years and compared to the material strength.
Retrieved 14 March Retrieved 7 October Wind turbines are capital intensive, and are usually purchased before they are being erected and commissioned. An update for IEC is scheduled for Small wind turbines are defined as being of up to m 2 swept 614000-1 and a somewhat simplified IEC standard addresses these. Material damage has a highly non-linearly relation to load amplitudes and thus to turbulence intensity, so a few situations with extreme turbulence may cause most of isc fatigue damage.
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.
The IEC 61400-1 turbine safety standard
March Learn how and when to remove this template message. The is a set of design requirements made to ensure that wind turbines are appropriately engineered against damage from hazards within the planned lifetime. IEC site assessment criteria. Depending on the load case, the wind interacting with the turbine is either deterministic or a pseudo-random wind field with realistic turbulence characteristics.
Variable atmospheric stability, unsteady wind, and directional variation of upwind terrain will introduce variations in observed turbulence intensity.
Wind turbines are designed for specific conditions. During the construction and design phase assumptions are made about the wind climate that the 16400-1 turbines will be exposed to.
It is also possible to use the IEC standard for turbines of less than m 2 swept area. Because the fatigue loads of a number of major components in a wind turbine are mainly caused by turbulence, the knowledge of how turbulent a site is of crucial importance.
You may have heard that IEC defines wind turbine classes with labels like III Bwhere the roman number refers to a reference wind speed and the index letter refers to a turbulence category. Views Read Edit View history. In flat terrain the wind speed increases logarithmically with height.
IEC started standardizing international certification on the subject inand the first standard appeared in To facilitate comparison with the NTM model, the IEC standard suggests the so-called effective turbulence intensity, which is an ideal turbulence independent on wind direction and expected to cause the same fatigue damage as variable turbulence in winds from all directions.
This imposes simple limits on fifty-year extreme wind, flow inclination and wind shear, see Figure 1, whereas turbulence assessment is more 661400-1. Turbulence intensity quantifies how much the wind ifc typically within 10 minutes. 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.
Wind turbine classes” Vestas. This page was last edited on 26 Septemberat It is, however, simpler to apply the site-assessment rules specified in another chapter of IEC Some of these standards provide technical conditions verifiable by an independent, third partyand as such are necessary in 61040-1 to make business agreements so wind turbines can be financed and erected.
This variation will generally decrease with wind speed, and the IEC normal turbulence model NTM accounts for this effect.