Iec 61400-3 Pdf Free Download
Mauricette Atencio
IEC 61400-3:2009 specifies additional requirements for assessment of the external conditions at an offshore wind turbine site and specifies essential design requirements to ensure the engineering integrity of offshore wind turbines.
Hi, I would like to simulate in OpenFAST the DLC 9.1, and I would like to discuss what would be the best approach.
I looked in the forum, but unfortunately I have not found anything relevant for this.
As a quick reminder, as far as I understood IEC 61400-3-2 DLC 9.1 (10.1) is an ALS, for a floating wind turbine with redundant mooring system, where one of the lines fail.
9.1 and 10.1 look at the transient when this happens, while 9.2 and 10.2 at the regime once the platform has reached the new equilibrium. 9.x is for normal wind-wave conditions, 10.x for extreme wind-wave conditions.
Since, I suppose, I cannot change the mooring configuration during the OpenFAST simulation (or maybe it can be done?), I was planning to run the equivalent simulation with all the lines intact, and then record the average position for all the DOFs.
Then, launch another simulation, where I impose as starting conditions all the average DOFs of the previous simulation, to mimic as much as possible the transient, removing one of the mooring lines.
While MoorDyn does not currently have the functionality to force a mooring line loss within the time-domain simulation, this is possible with a small change to the source code. This topic has been discussed in other forum posts, such as the following: Tendon failure in FAST modeling.
This part of IEC 61400 specifies additional requirements for assessment of the external conditions at an offshore wind turbine site and specifies essential design requirements to ensure the engineering integrity of fixed offshore wind turbines. Its purpose is to provide an appropriate level of protection against damage from all hazards during the planned lifetime.
This document focuses on the engineering integrity of the structural components of an offshore wind turbine but is also concerned with subsystems such as control and protection mechanisms, internal electrical systems and mechanical systems.
A wind turbine shall be considered as a fixed offshore wind turbine if the support structure is subject to hydrodynamic loading and it is founded on the seabed. The design requirements specified in this document are not sufficient to ensure the engineering integrity of floating offshore wind turbines. For floating installations, reference is made to IEC 61400-3-2. In the remainder of this document, the term "offshore wind turbine" is assumed to refer to those that are fixed to the seabed.
This document should be used together with the appropriate IEC and ISO standards mentioned in Clause 2. In particular, this document is fully consistent with the requirements of IEC 61400-1. The safety level of the offshore wind turbine designed according to this document shall be at or exceed the level inherent in IEC 61400-1. In some clauses, where a comprehensive statement of requirements aids clarity, replication of text from IEC 61400-1 is included.
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The International Design Standard for Offshore Wind Turbines: IEC 61400-3. IGERT Seminar February 21, 2013. J. F. Manwell, Prof. Wind Energy Center Dept. of Mechanical & Industrial Engineering Univ. of Mass., Amherst, MA 01003. Why Are Standards Necessary?.
Design Standards Analytical Assessment of Components Component Certification Component Testing Analytical Assessment of Entire Turbine Type Certification Prototype Testing Project Certification Analytical Assessment of Project The Larger Context
Design Methods Requires the use of a structural dynamics model of PD to predict design load effects Load effects to be determined for all relevant combinations of external conditions and design situations Design of support structure to be based on site-specific external conditions Design of RNA to be based on IEC 61400-1 (to extent possible)
Assessment ofMetoceanExternal Conditions Wind speeds and directions Significant wave heights, wave periods and directions Correlation of wind and wave statistics Current speeds and directions Water levels Occurrence and properties of sea ice Occurrence of icing Other parameters: air, water temperatures, densities; water salinity; bathymetry, marine growth, etc
Assessment of External Electrical Conditions (examples) Normal voltage and range Normal frequency, range and rate of change Voltage imbalance Method of neutral grounding; Method of ground fault detection / protection; Annual number of network outages; Total lifetime duration of network outages; Auto-reclosing cycles; Required reactive compensation schedule;
Assessment of Soil Conditions Geological survey of the site Bathymetric survey of the sea floor including registration of boulders, sand waves or obstructions on the sea floor Geophysical investigation Geotechnical investigations consisting of in-situ testing and laboratory tests
The objective of this paper is to investigate the effects of newly observed hurricane turbulence models on offshore wind turbines by considering unsteady aerodynamic forces on the tower and wind-wave-soil-structure interaction. The specific goals were analyzing the tower and blade structural buffeting responses, the low cycle fatigue during different hurricane categories, and extreme value of the short term responses. To achieve these goals, first, the recent observations on hurricane turbulence models were discussed. Then a new formulation for addressing unsteady wind forces on the tower was introduced and NREL-FAST package was modified with new formulation. Results showed that recently observed turbulence models resulted in larger structural responses and low cycle fatigue damage than existing models. In addition, extreme value analysis of the short term results showed that the IEC 61400-3 recommendation for wind turbine class I was conservative for designing the tower for wind turbine class S subjected to hurricane; however, for designing the blade, IEC 61400-3 recommendations for class I underestimated the responses.
IEC 61400-1:2019 specifies essential design requirements to ensure the structural integrity of wind turbines. Its purpose is to provide an appropriate level of protection against damage from all hazards during the planned lifetime. This document is concerned with all subsystems of wind turbines such as control and protection functions, internal electrical systems, mechanical systems and support structures. This document applies to wind turbines of all sizes. For small wind turbines, IEC 61400-2 can be applied. IEC 61400-3-1 provides additional requirements to offshore wind turbine installations. This document is intended to be used together with the appropriate IEC and ISO standards mentioned in Clause 2. This edition includes the following significant technical changes with respect to the previous edition:
a) general update and clarification of references and requirements;
b) extension of wind turbine classes to allow for tropical cyclones and high turbulence;
c) Weibull distribution of turbulence standard deviation for normal turbulence model (NTM);
d) updated design load cases (DLCs), in particular DLC 2.1 and 2.2;
e) revision of partial safety factor specifications
The contents of the corrigendum of September 2019 have been included in this copy.