ASSESSMENT OF IEC 61400-1 NORMAL TURBULENCE MODEL FOR WIND CONDITIONS IN TAIWAN WEST COAST AREAS

Yi-Ting Tsai,Chien-Chou Tseng,Jui-Ming Yo,Tzong-Shyng Leu,Jiu-Jih Miau,Ta-Chung Wang

doi:10.1142/s2010194514603822

Abstract

This paper studies the applicability of Normal Turbulence Model (NTM) in IEC61400-1 for wind conditions in Taiwan west coast area where future offshore wind farms are planning in the nearby areas. The parameters for the standard deviation of wind fluctuating [Formula: see text] are presented and compared with IEC Normal Turbulence Model. It is found that the trend of turbulence standard deviation [Formula: see text] based on the observation data agreed qualitatively well with IEC Normal Turbulence Model. However, IEC Normal Turbulence Model results in rather small [Formula: see text] compared to surveillance wind data in Taiwan. In this paper, model parameters for [Formula: see text] and [Formula: see text] based on the two-year observation wind data are proposed. The proposed model parameters a, b, α and β are 0.9125, 2.4345, 0.097 and 2.1875.

Highlights

Atmospheric wind speed in natural environment changes all the time, and these changes in wind speed is known as wind turbulence
The results indicate that the standard deviation ( σ ) of wind fluctuation are similar with the IEC standard turbulence model, but the standard deviation of σ is far greater than the IEC standards suggested model parameter values
The duration of wind speed that exceeds 10 m/s within the fullyear accounts for about 33%

Summary

Introduction

Atmospheric wind speed in natural environment changes all the time, and these changes in wind speed is known as wind turbulence. Wind turbines are subjected to wind turbulence that may affect their output power, loading, durability and operation life time. According to international standard IEC 61400-1, the wind conditions for a wind turbine design are typically divided into normal and extreme categories. The design load shall consist of potentially critical combinations of both normal and extreme wind conditions during wind turbine operation. Wind conditions are the primary loading conditions affecting structural integrity. Both normal and extreme conditions are considered for design of wind turbine. Wind fluctuation characteristics can have a large impact on the fatigue wind loading on wind turbine. The models of wind fluctuating velocity are very important on wind turbine design and operation

Methods

Results

Conclusion