GB/T 38957-2020.Technical specification for effect evaluation of tropical cyclone on offshore wind
power project.
1Scope
GB/T 38957 specifies the technical methods for determining the tropical cyclone impact assessment area, data collection and processing, tropical cyclone risk assessment and tropical cyclone power generation benefit evaluation
for offshore wind farms. GB/T 38957 is applicable to tropical cyclone risk assessment and power generation benefit evaluation for offshore wind power development.
2Normative references
The following documents are indispensable for the application of this document. For all dated references, only the dated version applies to this document. For all undated references, the latest version (including all amendments) applies to this document.
GB/T 31519-2015 Typhoon type wind turbine generator set
GB/T 36745-2018 Specification for determination of typhoon vortex wind measurement data
NB/T 31147-2018 Technical specification for measurement and assessment of wind energy resources for wind farm projects
QX/T 438-2018 Specification for calculation of design wind speed for bridges
IEC 61400-1:2019 Wind turbine generator systems-Part 1:Design requirements
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Offshore wind power project
A wind farm developed and constructed in the sea area below the multi-year average high tide line of the coastal area and on uninhabited islands in the corresponding development sea area.
Note: Rewrite NB/T 31029-2012, definition 2.0.3.
3.2
Tropical cyclone
Non-frontal vortex with organized convection and definite cyclonic circulation generated on tropical or subtropical oceans.
Note 1: Includes tropical depression, tropical storm, severe tropical storm, typhoon, severe typhoon and super typhoon.
Note 2: Rewrite GB/T 19201-2006, definition 2.1.
3.3
Engineering area
Enclosed sea area consisting of the lines connecting several control points outside the offshore wind farm.
3.4
​​ evaluation of the benefits of tropical cyclone energy production
Evaluation of the benefits of tropical cyclone energy production in the outer wind area of ​​a tropical cyclone that meets the power generation conditions of wind turbines.
Specifies the technical methods for determining the tropical cyclone impact assessment area, data collection and processing, tropical cyclone risk assessment and tropical cyclone power generation benefit assessment for offshore wind farms.

ICS07.060
National Standard of the People's Republic of China
GB/T38957—2020
Technical specification for effect evaluation of tropical cyclone on offshore windpowerproject
Released on 2020-07-21
State Administration for Market Regulation
National Standardization Administration
Implementation on 2020-07-21
Normative reference documents
Terms and definitions
Determination of assessment area
Data collection and processing
Tropical cyclone risk assessment
Tropical cyclone power generation benefit assessment
Appendix A (Normative Appendix)
Calculation of wind speed at hub height under standard air density Appendix B (Normative Appendix)
References
Poisson-Gumbel distribution of tropical cyclone influence GB/T38957—2020
This standard was drafted in accordance with the rules given in GB/T1.1-2009. This standard was proposed by the China Meteorological Administration.
This standard is under the jurisdiction of the National Technical Committee for Standardization of Climate and Climate Change (SAC/TC540). GB/T38957—2020
The drafting units of this standard are: China Meteorological Administration Public Meteorological Service Center, China Meteorological Science Research Institute, Guangdong Meteorological Bureau, Beijing Jiutian Meteorological Technology Co., Ltd., China Three Gorges New Energy (Group) Co., Ltd., Xinjiang Goldwind Science & Technology Co., Ltd., and China General Nuclear Power Wind Power Co., Ltd.
The main drafters of this standard are: Wang Binglan, Song Lili, Li Ying, Quan Lihong, Huang Haohui, Chen Wenchao, Yuan Chunhong, Zhi Shiqun, Liu Bing, Nan Lan, Ning Qiaozhen, Ao Juan, Li Jing, Dong Li, and Cheng Hexiang. Sz
1 Scope
Technical Specification for Tropical Cyclone Impact Assessment for Offshore Wind Farms GB/T38957—2020
This standard specifies the technical methods for determining the tropical cyclone impact assessment area, data collection and processing, tropical cyclone risk assessment, and tropical cyclone power generation benefit assessment for offshore wind farms. This standard applies to tropical cyclone risk assessment and power generation benefit assessment for offshore wind power development. 2 Normative References
The following documents are essential for the application of this document. For all dated references, only the dated version applies to this document. For any undated referenced documents, the latest version (including all amendments) shall apply to this document GB/T31519—2015
GB/T36745—2018
Typhoon-type wind turbine generator set
Typhoon vortex wind measurement data identification specification
3 Technical specification for wind energy resource measurement and assessment of wind farm projects NB/T31147—2018
QX/T438—2018 Specification for calculation of wind speed for bridge design IEC61400-1:2019
Design Requirements)
Terms and definitions
Wind energy generation systems Part 1: Design requirements (Wind energy generation systems Part 1: The following terms and definitions apply to this document. 3.1
offshore wind power project
Offshore wind farm
A wind farm developed and constructed in the sea area below the multi-year average high tide line of the coastal area and on uninhabited islands in the corresponding development sea area. Note: Rewrite NB/T31029-2012. Definition 2.0.3. 3.2
Tropical cyclone
tropicalcyclone
Non-frontal vortex with organized convection and definite cyclonic circulation generated on tropical or subtropical oceans Note 1: Includes tropical depression, tropical storm, severe tropical storm, typhoon, severe typhoon and super typhoon. Note 2: Rewrite GB/T19201-2006, definition 2.1. 3.3
engineeringarea
Enclosed sea area formed by the connection of several control points outside the offshore wind farm, 3.4
Evaluation of the benefits of tropical cyclone power generation
evaluation of thebenefits of tropical cycloneenergyproduction The evaluation of the benefits of tropical cyclone energy production in the outer wind area of ​​a tropical cyclone that meets the power generation conditions of wind turbines. 3.5
evaluationarea
Evaluation area
The area that extends beyond the boundary of the project area to a certain extent and is used for risk assessment or benefit assessment. 1
GB/T38957—2020
referencemeteorological station A national meteorological observation station with long-term meteorological observation data that is referenced or quoted in meteorological analysis and calculation. Note 1: The long period is generally not less than 30 years
Note 2: Rewrite QX/T469-2018, definition 3.2. 3.7
dedicated meteorological station dedicatedmeteorologicalstation A meteorological observation station established for obtaining meteorological element values ​​for the site selection or construction of offshore wind farm projects. Note 1: Dedicated meteorological stations should have three-dimensional high-frequency (sampling frequency of 1 Hz and above) observations at the hub height. Note 2: Rewrite QX/T449-2018, definition 3.2. 3.8bzxZ.net
Variation of wind direction
The angle of change of horizontal wind direction within a specified time interval. Calculation is as follows (1): AD = D, -D
Wherein:
Wind direction variation angle, in degrees ();
Wind direction at the previous moment within the specified time interval, in degrees (); D2
Wind direction at the next moment within the specified time interval, in degrees (). Return period
returnperiod
The average interval between the recurrence of an event. Note 1: If the return period is N years, the probability of occurrence of the event is once in N years. The return periods adopted in this standard are 50 years and 1 year. Note 2: Rewritten from QX/T436-2018, definition 3.3. 3.10
maximum wind speed
maximum wind speed
the maximum value of the average wind speed in a given period
[GB/T31724-2015, definition 2.27] 3.11
extreme wind speed
extreme wind speed
the maximum value of the 3s average wind speed in a given period. [GB/T31724-2015, definition 2.28] 3.12
probability of exceeding classes winds of wind turbine generator system The probability that a wind turbine generator system may encounter wind speeds greater than or equal to the wind speeds of each class specified in IEC61400-1:2019 or GB/T31519-2015 at the hub height. Note: The wind speeds of wind turbine generator sets (WTGS) of levels I, I, and III specified in IEC61400-1:2019 are 50m/s, 42.50m/s, and 37.5m/s respectively, and the wind speed in typhoon-affected areas is 57m/s. The wind speeds of typhoon-type wind turbine generator sets (WTGS) of levels TI and TⅡ specified in GB/T31519-2015 are 55m/s and 50m/s respectively.
referenceturbulence intensityreferenceturbulence intensity
reference value of turbulence intensity in the range of 14.5m/s~15.5m/s. Note: The reference turbulence intensity in IEC61400-1:2019 is defined as the turbulence intensity of the 70% quantile of the data with a wind speed of 15m/s, and the reference turbulence intensity in GB/T18451.1-2012 is defined as the average value of the turbulence intensity of the data with a wind speed of 15m/s2
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