idsession
code

131

C-4-1

Comparison of three aeroelastic
codes on parked wind turbine under Mr. Yoshitaka Totsuka
extreme wind speed condition

Wind Energy Institute of Tokyo Inc.

29

C-4-2

Experimental Investigation andSimulation of Effect of Turbulence
Intensity on Performance ofHorizontal Axis Wind Turbine

Fluid Engineering Laboratory, Mie
University

138

C-4-3

Severe conditions and complexity ofMr. Ts Sukhbaatar
Mongolia's 1st Wind Farm

Clean Energy LLC

145

C-4-4

Wind Power Project in Bhutan

Renewable Energy Business
Department, KOMAI HALTEC Inc.

title

Presenter name

Mr. Sang Quang LeMr. Ruka Ogawa

Affiliation

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1-Nov. 13:45 - 15:15 [ Severe conditions and complex terrain (1) ]COMPARISON OF THREE AEROELASTIC CODES ON PARKED
WIND TURBINE UNDER EXTREME WIND SPEED CONDITION
Yoshitaka Totsuka1, Hiroshi Imamura1 and Anders Yde2
1Wind Energy Institute of Tokyo Inc., 2Technical University of Denmark

Abstract:
Among Renewable energy source, especially offshore wind energy gains prominence because energy potential of offshore
wind is abundant in Japan. Toward widespread use of offshore wind energy in Japan, accurate computation of coupled windturbine structural dynamics, aerodynamics, hydrodynamics, mooring dynamics with control algorithms is highly significant for
design optimization and certification process of offshore wind turbine. In design process, all of design load cases (DLCs) which
are prescribed in IEC61400 have to be analyzed for load estimation in order to design wind turbine components. In some windturbine designs, maximum ultimate load is expected for some components to occur under extreme wind speed condition inDLC6.x, even though wind turbine is parked with rotor brake or idling to minimize loads. This research focus on vibration
problem under 50-year storm conditions while rotor is parked and blades are feathered. In this parked scenario, effect of a winddirection change of up to &plusmn; 180 degrees for both cases of standstill and idling is analyzed by time domain simulations
using three different coupled aero-hydro-servo-elastic codes. Trend in modern wind turbines is development of bigger, lighterand more flexible rotors where vibration issues may cause aero-elastic instabilities which have a serious impact on the ultimate
loads. The DTU 10MW Reference Wind Turbine (RWT) is chosen as wind turbine model in this research..
DTU 10MW wind turbine model is chosen to analyze by using various aero-hydro elastic-control dynamics computational
tools. Ultimate load case for parked wind turbine is analyzed under extreme wind condition that is specified in IEC61400. In
specific yaw misalignment case, we observed significant vibrations in time series data of edgewise bending moment at bladeroot.

Experimental Investigation and Simulation of Effect of Turbulence
Intensity on Performance of Horizontal Axis Wind TurbineSang Quang Le1, Yasunari Kamada2, Atsushi Fujiwara2, Takao Maeda2 and Junsuke Murata2
1Fluid Engineering Laboratory, Mie University, 2Division of Mechanical Engineering, Mie University

Abstract:
Up to now, wind energy is increasingly large proportion of renewable energy sources in the world and wind turbines are also
larger (both hub height and blade length). Many recent papers have been shown reduction of wind turbine structural loads,
maximization of wind energy capture and stabilization operation of wind turbine in order to protect the wind turbine
components and reduce the cost of wind energy. The aerodynamic behavior of a horizontal axis wind turbine in a uniform
inflow, i.e. same wind speed and direction at all the points, is today well understood and can be modeled quite accurately. Infact, however, the inflow is usually unsteady and continuously change because of the difference terrain, wind shear etc., whichmake fluctuations of the wind speed and directions around the mean profiles. The purpose of the paper is to assess the impactsof turbulence intensity to performance of a HAWT. A three-bladed wind turbine model is chosen to be researched and analysis
effect of turbulence intensity on performance of wind turbine in wind tunnel. An Avistar airfoil is used for blade sectional shapeof the three-bladed wind turbine. The rotor diameter is 1.6 m. The impaction is considered as turbulence intensity, power output
P, tip speed ratio λ. In order to generate turbulent wind, an active grid system is assembled in a wind tunnel. The active grid
system is adjusted to generate turbulent wind condition by 24 servo motors. The approaching flows included low-turbulencesmooth flow of 1.6%, grid-generated turbulent flow of 10.5% (in the experiment) and high turbulence intensity of 20% (in thesimulation case). Wind velocity is measured by hot wire anemometer. A reference wind velocity of approximately 7.5 m/s wereused in all the experiments and simulation case.
To simulate operation of wind turbine in turbulence condition, the QBlade software version 0.91b is used. The QBladesoftware based on the classical Blade Element Momentum (BEM) theory coupling the momentum theory or disk actuatortheory, a mathematical model of an ideal actuator disc, with the blade element theory which describes the local events taking
place at the actual blade. The turbulence intensity effect issue on wind turbine performance is also investigated by FAST
(Fatigue, Aerodynamics, Structures, and Turbulence) code version0.8. From results of experiment and simulation, there arequite disagreement between them because the input data of QBlade software was not modelled with sufficient fidelity comparedwith wind turbine model. In addition, the results from the experiment study performance of wind turbine in the turbulence
intensity in the incoming wind field will be discuss in the next session. The wind turbine load is considered in the turbulence
condition and the some other results will be also shown in final part of this paper.

2/31-Nov. 13:45 - 15:15 [ Severe conditions and complex terrain (1) ]Severe conditions and complexity of Mongolia's 1st Wind Farm
Ts Sukhbaatar
Clean Energy LLC

Abstract:
Compared with central Asian Countries, Mongolia is effecting from global warming more seriously. Other hand air pollution
in Mongolia, especially in settled areas is going a disaster.
The constituent policy in Mongolia is focusing more mitigation actions against global warming and air pollution. One ofsolution of air pollution crisis in worldwide is to use more renewable energy sources such as wind power to avoid more fossil
fuels burning and to mitigate global warming.
Subject of the paper will concern about relevant wind energy resource in Mongolia and about the construction severity of the
1st wind farm in central Mongolia nearby Ulaanbaatar.
Problems on power market liberalization and on the integration, and curtailment issues were described in the presentation.
It will be introduce about first experiences of large scale wind farm in remote areas where turbines have to work under
extreme conditions of an onshore sole wind farm which is operating in temperature range -40°C to +30°C in Mongolia.
The cold conditions and temperature changes are big challenge to the Wind Turbines and its maintenance and repair. Servicesand maintenance have to be postponed because of restricted access caused by weather conditions and it impacts on turbine
availability and profitability.
The paper is intended to know that the operation teams are learning how to best process and use the information provided bySCADA systems in their operational strategies. How can be used available data to improve the services and maintenanceefficiency, minimize downtime in high wind days, and maximize the power production. Cold weather de-rating and icing of thewind turbines during the cold winter operation makes various difficulties. Application of the wind forecast analysis andcondition monitoring opportunities in the wind farm. The operation and service team must work out in the field, sometimes indifficult weather conditions. This can present both challenges and opportunities.
This paper is not intended to be an in-depth study of all the opportunities but to give knowledge on conditions and problems
in Mongolia’s emerging wind resources application and its future.

Wind Power Project in Bhutan
Ruka Ogawa, Naohisa Hosoda and Masao Hosomi
Renewable Energy Business Department, KOMAI HALTEC Inc.

Abstract:
As a renewable energy project for the first project in Bhutan, Himalayan small country, a wind farm by two 300kW windturbines was completed in Rubessa, Wandi Phodrang District, on January 2016. Komaihaltec Inc. of 300kW wind turbine,
named KWT300 has been adopted.
Considering the Bhutan of road conditions based on the information of “Resarch and data collection of basic information ofrenewable energy in Bhutan” wind turbine size capable of being introduced into Bhutan is found to be 300kW scale as amaximum. Elevation of the site is 1300m, relatively low altitude in Bhutan, and climate is also warm area. According to asurvey by the US National Renewable Energy Laboratory (NREL), The areas along to several rivers which run from north tosouth are strong wind area.
The wind conditions survey at 20m height was carried out, annual average wind speed is 5.7m/s, it can be not so much higher
wind speed. However, it can be found from the graph indicated below, there is a feature that very high probability of windspeed over 9m/s is occured .We have to pay attention to this featune that the characteristics of the wind varies with wind speed.
Implementation location of this project is also located along the Puna Tsang chu River, is known as a strong area of windfrom a long time ago.
In the paper, the project overview and the examine contents are introductioned. These are the influence on the wind turbine athigh altitude and the implementation contents of the transport and construction in the field that was extremely severe condition.

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