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

2014 ◽  
Vol 34 ◽  
pp. 1460382 ◽  
Author(s):  
TZONG-SHYNG LEU ◽  
JUI-MING YO ◽  
YI-TING TSAI ◽  
JIU-JIH MIAU ◽  
TA-CHUNG WANG ◽  
...  
Keyword(s):  
Standard Deviation ◽  
Turbulence Model ◽  
West Coast ◽  
Wind Farms ◽  
Offshore Wind ◽  
Wind Data ◽  
Model Parameters ◽  
Observation Data ◽  
Offshore Wind Farms ◽  
Proposed Model

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.

Wind Energy Perspectives in Myanmar

2020 ◽  
pp. 181-210
Author(s):  
Evgenii Ignatev ◽  
Galina Deryugina ◽  
Htet Myat Htoon ◽  
Mikhail Tyagunov
Keyword(s):  
Wind Energy ◽  
Wind Turbine ◽  
West Coast ◽  
Wind Farms ◽  
Offshore Wind ◽  
Optimal Composition ◽  
Construction Sites ◽  
Offshore Wind Farms ◽  
Installed Capacity ◽  
Energy Shortage

One of Myanmar's problems is energy shortage. Partially, energy shortage can possibly be decreased by the construction of sizeable grid-connected offshore wind farms. Eight prospective construction sites were selected and wind turbine models chosen. This chapter describes the method for determining the optimal composition of the wind farms complex, consisting of several offshore wind farms located at a considerable distance from each other in areas with significant wind regime asynchrony. To illustrate this method, the optimal composition with an installed capacity of 47.6 MW and located off Myanmar's west coast is defined.

scholarly journals Reliability Analysis on One-Step Overall Transportation of Composite Bucket Foundation for Offshore Wind Turbine

Energies ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 23
Author(s):  
Jijian Lian ◽  
Pengwen Wang ◽  
Conghuan Le ◽  
Xiaofeng Dong ◽  
Xu Yang ◽  
...  
Keyword(s):  
Theoretical Calculations ◽  
Wind Farms ◽  
Frequency Domain Analysis ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Observation Data ◽  
Offshore Wind Farms ◽  
One Step ◽  
The One ◽  
Installation Technology

Composite bucket foundations, which have been successfully transported, installed, and operated at the Qidong, Xiangshui, and Dafeng offshore wind farms in China, are economically advantageous due to the relatively simple transportation and installation process. The innovative one-step transportation and installation technology of foundation-tower-nacelle is the key phase in saving costs. In this paper, a “foundation lift ship” overall transport mode is proposed and introduced for the first time. Prototype data measurement, preliminary numerical simulation, and theoretical calculations were conducted to investigate whether the foundation-ship integrity, tower hoop stability, and various indexes of the nacelle met the requirements under the influences of various environmental factors. The multi-system coupling motion mechanism and analysis method of this new structure and transportation mode were expounded. Through the prototype observation data of the one-step overall transportation, the ship-foundation system reliability of the structure in the case of large wind and wave was confirmed. Furthermore, it was found that in the one-step overall transportation, the importance of factors to nacelle acceleration decreased in the order of wave height, current speed, and wind speed by the time and frequency domain analysis and data statistics.

scholarly journals A Stochastic Petri Net Model for O&M Planning of Floating Offshore Wind Turbines

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 1134
Author(s):  
Tobi Elusakin ◽  
Mahmood Shafiee ◽  
Tosin Adedipe ◽  
Fateme Dinmohammadi
Keyword(s):  
Wind Energy ◽  
Wind Turbines ◽  
Wind Farms ◽  
Spare Parts ◽  
Offshore Wind ◽  
Floating Platform ◽  
Offshore Wind Farms ◽  
Offshore Wind Turbines ◽  
Proposed Model ◽  
Floating Offshore Wind Turbines

With increasing deployment of offshore wind farms further from shore and in deeper waters, the efficient and effective planning of operation and maintenance (O&M) activities has received considerable attention from wind energy developers and operators in recent years. The O&M planning of offshore wind farms is a complicated task, as it depends on many factors such as asset degradation rates, availability of resources required to perform maintenance tasks (e.g., transport vessels, service crew, spare parts, and special tools) as well as the uncertainties associated with weather and climate variability. A brief review of the literature shows that a lot of research has been conducted on optimizing the O&M schedules for fixed-bottom offshore wind turbines; however, the literature for O&M planning of floating wind farms is too limited. This paper presents a stochastic Petri network (SPN) model for O&M planning of floating offshore wind turbines (FOWTs) and their support structure components, including floating platform, moorings and anchoring system. The proposed model incorporates all interrelationships between different factors influencing O&M planning of FOWTs, including deterioration and renewal process of components within the system. Relevant data such as failure rate, mean-time-to-failure (MTTF), degradation rate, etc. are collected from the literature as well as wind energy industry databases, and then the model is tested on an NREL 5 MW reference wind turbine system mounted on an OC3-Hywind spar buoy floating platform. The results indicate that our proposed model can significantly contribute to the reduction of O&M costs in the floating offshore wind sector.

A Study of the Normal Turbulence Model in IEC 61400-1

2012 ◽  
Vol 36 (6) ◽  
pp. 759-765 ◽  
Author(s):  
Takeshi Ishihara ◽  
Atsushi Yamaguchi ◽  
Muhammad Waheed Sarwar
Keyword(s):  
Standard Deviation ◽  
Turbulence Model ◽  
Mean Value ◽  
Model Parameters ◽  
Proposed Model ◽  
The Mean ◽  
Good Agreement

This study examines applicability of Normal Turbulence Model (NTM) in IEC 61400-1 for offshore conditions using wind records obtained at an offshore site. The model parameters for estimation of the standard deviation of longitudinal fluctuating velocity, σ1, in NTM are presented. The identified model parameters for the mean value of σ1 agree well with those of IEC Normal Turbulence Model, but parameters for the standard deviation of σ1 are found to be larger than those used in IEC. As a result, the standard deviation of σ1 obtained by IEC Normal Turbulence Model parameters is underestimated and predicted that by the proposed model parameters shows a good agreement with the observation.

Disturbance of harbour porpoises during construction of the first seven offshore wind farms in Germany

2018 ◽  
Vol 596 ◽  
pp. 213-232 ◽  
Author(s):  
MJ Brandt ◽  
AC Dragon ◽  
A Diederichs ◽  
MA Bellmann ◽  
V Wahl ◽  
...  
Keyword(s):  
Wind Farms ◽  
Offshore Wind ◽  
Offshore Wind Farms

Feasibility study for the installation of offshore wind farms in the Canary Islands

2009 ◽  
Vol 1 (07) ◽  
pp. 809-813
Author(s):  
M. Martínez ◽  
A. Pulido ◽  
J. Romero ◽  
N. Angulo ◽  
F. Díaz ◽  
...  
Keyword(s):  
Feasibility Study ◽  
Canary Islands ◽  
Wind Farms ◽  
Offshore Wind ◽  
Offshore Wind Farms

scholarly journals Offshore wind farms and the attraction–production hypothesis: insights from a combination of stomach content and stable isotope analyses

Hydrobiologia ◽  
2021 ◽  
Author(s):  
Ninon Mavraki ◽  
Steven Degraer ◽  
Jan Vanaverbeke
Keyword(s):  
Stable Isotope ◽  
Stomach Content ◽  
Wind Farms ◽  
Offshore Wind ◽  
Artificial Reefs ◽  
Dietary Composition ◽  
Trachurus Trachurus ◽  
Offshore Wind Farms ◽  
Scomber Scombrus ◽  
Isotope Analyses

AbstractOffshore wind farms (OWFs) act as artificial reefs, attracting high abundances of fish, which could potentially increase their local production. This study investigates the feeding ecology of fish species that abundantly occur at artificial habitats, such as OWFs, by examining the short- and the long-term dietary composition of five species: the benthopelagic Gadus morhua and Trisopterus luscus, the pelagic Scomber scombrus and Trachurus trachurus, and the benthic Myoxocephalus scorpioides. We conducted combined stomach content and stable isotope analyses to examine the short- and the time-integrated dietary composition, respectively. Our results indicated that benthopelagic and benthic species utilize artificial reefs, such as OWFs, as feeding grounds for a prolonged period, since both analyses indicated that they exploit fouling organisms occurring exclusively on artificial hard substrates. Trachurus trachurus only occasionally uses artificial reefs as oases of highly abundant resources. Scomber scombrus does not feed on fouling fauna and therefore its augmented presence in OWFs is probably related to reasons other than the enhanced food availability. The long-termed feeding preferences of benthic and benthopelagic species contribute to the hypothesis that the artificial reefs of OWFs could potentially increase the fish production in the area. However, this was not supported for the pelagic species.

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