wind energy institute of tokyo no.1 proposal for an amendment to iec 61400-3 ed.1 japanese national...
TRANSCRIPT
Wind Energy Institute of Tokyo
No.1
Proposal for an amendmentto IEC 61400-3 Ed.1
Japanese National Committee for IEC/TC88March 11, 2010
SUZUKI Akihiro
IEC/TC88 Meeting @Boulder, CO, U.S.A.
Wind Energy Institute of Tokyo
2Background
• JP NC is preparing JIS C1400-3• Incorporating of regional
meteorological and marine conditions
• Similar conditions in China, Korea and others
• Additional Wave models– Oceans, Large and deep
• Extreme Conditions– Tropical storms (typhoon)
Wind Energy Institute of Tokyo
3Scope of Revision
• Correction and/or modification on 61400-3 Ed.1
• Additional Informative Annex– “Methodology of extrapolating
extreme wind and wave conditions from available data set”
– for evaluation of extreme conditions
Wind Energy Institute of Tokyo
4Proposed changes
1. Add ISO 21650:2007 “Actions from waves and currents on coastal structures” to the normative references,
2. Modify the definition of the extreme significant wave height,3. Add definitions of significant wave height,4. Modify clause 6.2 “wind turbine classes” to specify the offshore
wind turbine class,5. Modify descriptions for NWH, SWH, ESS, EWH, RWH and sea
currents,6. Change “breaking wave induced surf currents” to “Wave-induced
nearshore currents” and revise clause 6.4.2.3,7. Modify clause 12.4 “Assessment of waves”,8. Modify Annex B “Wave statistics and spectral formulation”,9. Modify Annex C “Shallow water hydrodynamics and breaking
waves”,10.Add requirements to specify the design value and the methodology
for the offshore wind turbine selection in extreme conditions, Annex I “Methodology of extrapolating extreme wind and wave conditions from available data sets” as a new informative annex.