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Fatigue loads on wind turbine blades in a wind farm

Technical Report:

Abstract

This paper presents the flap moment load spectrum in the blades on turbines operating in a wind farm and comparisons are made with a single turbine. The Swedish State Power Board is operating a small wind turbine farm situated at Alsvik on the west coast of the island of Gotland in the Baltic Sea. The farm consists of four Danwin 23/180 kW turbines. Three turbines are placed close to the shoreline in a row that runs approximately in the nort-south direction. The fourth turbine is placed to the east of the row so that the distances to the other turbines are 5, 7 and 9.5 turbine diameters. The prevailing wind direction is south-west which means that the fourth turbine often operates in the wake of another turbine. The site is favourable for wake studies since the surrounding terrain is flat and the wind often blows from the open sea. The influence of wakes on the load spectrum is important to take into account. Especially for offshore sites where the surrounding terrain does not give high load cycles due to high turbulence intensity or high wind shear. This study shows that also wakes from 9.5 diameters distance give significantly higher loads.  More>>
Publication Date:
Jun 01, 1992
Product Type:
Technical Report
Report Number:
NUTEK-VIND-92-9; FFA-TN-92-21
Reference Number:
SCA: 170600; PA: SWD-92:007312; SN: 93000918391
Resource Relation:
Other Information: PBD: Jun 1992
Subject:
17 WIND ENERGY; TURBINE BLADES; WIND LOADS; WIND POWER; WIND POWER PLANTS; WIND TURBINE ARRAYS; WIND TURBINES; FATIGUE; COASTAL REGIONS; POWER RANGE 100-1000 KW; TURBULENCE; EXPERIMENTAL DATA; 170600; WIND ENERGY ENGINEERING
OSTI ID:
10113659
Research Organizations:
Swedish National Board for Industrial and Technical Development (NUTEK), Stockholm (Sweden); Aeronautical Research Inst. of Sweden, Bromma (Sweden)
Country of Origin:
Sweden
Language:
English
Other Identifying Numbers:
Other: ON: DE93753079; CNN: Project NUTEK-506-266; TRN: SE9207312
Availability:
OSTI; NTIS
Submitting Site:
SWD
Size:
31 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Poppen, M, and Dahlberg, J Aa. Fatigue loads on wind turbine blades in a wind farm. Sweden: N. p., 1992. Web.
Poppen, M, & Dahlberg, J Aa. Fatigue loads on wind turbine blades in a wind farm. Sweden.
Poppen, M, and Dahlberg, J Aa. 1992. "Fatigue loads on wind turbine blades in a wind farm." Sweden.
@misc{etde_10113659,
title = {Fatigue loads on wind turbine blades in a wind farm}
author = {Poppen, M, and Dahlberg, J Aa}
abstractNote = {This paper presents the flap moment load spectrum in the blades on turbines operating in a wind farm and comparisons are made with a single turbine. The Swedish State Power Board is operating a small wind turbine farm situated at Alsvik on the west coast of the island of Gotland in the Baltic Sea. The farm consists of four Danwin 23/180 kW turbines. Three turbines are placed close to the shoreline in a row that runs approximately in the nort-south direction. The fourth turbine is placed to the east of the row so that the distances to the other turbines are 5, 7 and 9.5 turbine diameters. The prevailing wind direction is south-west which means that the fourth turbine often operates in the wake of another turbine. The site is favourable for wake studies since the surrounding terrain is flat and the wind often blows from the open sea. The influence of wakes on the load spectrum is important to take into account. Especially for offshore sites where the surrounding terrain does not give high load cycles due to high turbulence intensity or high wind shear. This study shows that also wakes from 9.5 diameters distance give significantly higher loads. (2 refs., 28 figs.).}
place = {Sweden}
year = {1992}
month = {Jun}
}