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 facilitate comparison with the NTM model, the IEC standard suggests the so-called effective turbulence intensity, which is 6140-01 ideal turbulence independent on wind direction and expected to cause uec same fatigue damage as variable turbulence in winds from all directions.
This page was last edited on 26 Septemberat 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 the fatigue damage.
Turbine classes are determined by three parameters – the average wind speed, extreme year gust, and turbulence. Turbulence intensity quantifies how much the wind varies typically within 10 minutes.
The IEC 61400-1 turbine safety standard
It is also possible to use the IEC standard for turbines of less than m 2 swept area. Aeroelastic simulations ice processed for all IEC load cases, and turbine safety is verified for each of the deterministic load cases. Unlike the NTM turbulence model, site-specific turbulence usually depends on wind direction.
March Learn how and when to remove this template message. Turbine wind class is just one of the factors needing consideration during the complex process of planning a wind power plant.
Wind turbines are designed for specific conditions. Wind turbine classes” Vestas.
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. 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.
Effective turbulence intensity will generally decrease with wind speed due to decreasing stability effects and turbine thrust coefficient. The common set of standards sometimes replace the various national standards, forming a basis for global certification.
IEC – Wikipedia
In principle, the aeroelastic simulation could be repeated with local wind conditions at specific turbine positions. The load type is either an ultimate load, which might instantly damage the turbine, or a fatigue load. Archived from the original on 7 October Each load case is specified by combinations of mode of turbine operation, wind conditions, and load type. An update for IEC is scheduled for Languages Deutsch Edit links. Here, the main principle is that local wind conditions must not exceed those of the models used for turbine classification.
Basic Aspects” Suzlon Energy. From Wikipedia, the free encyclopedia. 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. National Renewable Energy Laboratory participates in IEC standards development work,   and tests equipment according to these standards. Webarchive template wayback links Articles lacking in-text citations from March All articles lacking in-text citations Use British English Oxford spelling from January In addition, the accumulated fatigue damage caused by stochastic forcing is evaluated for a design life time of twenty years and compared to the material strength.
The IEC turbine safety standard – WAsP
The IEC turbine safety standard. Examples of modes of operation are normal operation, idling, and operation with yaw error. 61400–1 Read Edit View history. The effective turbulence intensity includes added turbulence from wakes of neighbour turbines, and a simple wake turbulence model is provided. Wind turbines are capital intensive, and are usually purchased before they are being erected and commissioned.
Retrieved 7 October The standard concerns most aspects of the turbine life from site conditions before construction, to turbine components being tested, idc assembled and operated. Wind classes determine which turbine is suitable for the normal wind conditions of a particular site.
Retrieved 18 March