• Title/Summary/Keyword: Wind Turbines

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A numerical simulation of flow field in a wind farm on complex terrain

  • Lee, Myungsung;Lee, Seung Ho;Hur, Nahmkeon;Choi, Chang-Koon
    • Wind and Structures
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    • v.13 no.4
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    • pp.375-383
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    • 2010
  • A three-dimensional flow simulation was performed to investigate the wind flow around wind-power generation facilities on mountainous area of complex terrain. A digital map of eastern mountainous area of Korea including a wind farm was used to model actual complex terrain. Rotating wind turbines in the wind farm were also modeled in the computational domain with detailed geometry of blade by using the frozen rotor method. Wind direction and speed to be used as a boundary condition were taken from local meteorological reports. The numerical results showed not only details of flow distribution in the wind farm but also the variation in the performance of the wind turbines due to the installed location of the turbines on complex terrain. The wake effect of the upstream turbine on the performance of the downstream one was also examined. The methodology presented in this study may be used in selecting future wind farm site and wind turbine locations in the selected site for possible maximum power generation.

Wind Farm Design Considering Turbulence Intensity on Complex Terrain (복잡지형에서 난류강도를 고려한 풍력발전단지설계)

  • Park, Mi-Ho;Ko, Kyung-Nam;Huh, Jong-Chul
    • Journal of the Korean Solar Energy Society
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    • v.33 no.6
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    • pp.1-11
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    • 2013
  • The investigation on wind farm design using CFD technique was carried out to reduce turbulence intensity in a wind farm. A potential wind farm in Gasiri of Jeju Island was selected for the design and the commercial S/W of Meteodyn WT was used for applying CFD technique. The initial layout of wind turbines was derived using WindPRO which is mainly used for wind farm design in Korea. Then, the distribution of turbulence intensity on complex terrain was calculated and visible by Meteodyn WT. Based on the distribution, wind turbines were positioned properly. As a result, wind turbines could be deployed at positions with minimum turbulence intensity as well as maximum Annual Energy Production, AEP, using Meteodyn WT. It is necessary to take into account turbulence intensity in wind farm design to avoid wind turbine failure.

Wake Losses and Repositioning of Wind Turbines at Wind Farm (풍력발전단지의 후류손실 및 터빈 재배치에 관한 연구)

  • Park, Kun-Sung;Ryu, Ki-Wahn;Kim, Hyun-Goo
    • Journal of the Korean Solar Energy Society
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    • v.35 no.3
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    • pp.17-25
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    • 2015
  • The main objective of this study is to predict the wind power generation at the wind farm using various wake models. Modeling of wind farm is a prerequisite for prediction of annual energy production at the wind farm. In this study, we modeled 20 MW class Seongsan wind farm which has 10 wind turbines located at the eastern part of Jeju Island. WindSim based on the computational fluid dynamics was adopted for the estimation of power generation. The power curve and thrust coefficient with meteorology file were prepared for wind farm modelling. The meteorology file was produced based on the measured data of the Korea Wind Atlas provided by Korea Institute of Energy Research. Three types of wake models such as Jensen, Larsen, and Ishihara et al. wake models were applied to investigate the wake effects. From the result, Jensen and Ishihara wake models show nearly the same value of power generation whereas the Larsen wake model shows the largest value. New positions of wind turbines are proposed to reduce the wake loss, and to increase the annual energy production of the wind farm.

The Development of the Foundation of Offshore Wind Turbines (해상풍력발전용 Foundation에 관한 해외 동향)

  • Wei, Shi;Park, Hyun-Chul
    • 한국신재생에너지학회:학술대회논문집
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    • 2008.10a
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    • pp.290-294
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    • 2008
  • Offshore wind farms will contribute significantly to the renewable generation of electricity for the world. The economic development of wind farms depends, however, on development of efficient solutions to a number of technical issues, one of these being the foundations for the offshore turbines. We review here the results of recent research for wind turbine foundations. Also it is a short overview of some of the challenges facing the growth of offshore wind energy foundation technology.

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Pitch Control Simulation of Horizontal Wind Power System (수평축 풍력발전시스템의 피치제어 시뮬레이션)

  • Hwang, Sung-Joon;Seo, Young-Taek;Oh, Chul-Soo
    • Proceedings of the KIEE Conference
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    • 2000.07b
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    • pp.846-848
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    • 2000
  • In the early development of wind energy, the majority of wind turbines were operated at constant speed. Recently, the number of variable-speed wind turbines adopted pitch control apparatus has increased. This paper deal with a simulation of pitch control of variable-speed wind turbine and the response of pitch angle is traced in a given random wind speed.

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Design of Nonlinear Controller for Variable Speed Wind Turbines based on Kalman Filter and Artificial Neural Network (칼만필터 및 인공신경망에 기반한 가변속 풍력발전 시스템을 위한 비선형 제어기 설계)

  • Moon, Dae-Sun;Kim, Sung-Ho
    • Journal of the Korean Institute of Intelligent Systems
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    • v.20 no.2
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    • pp.243-250
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    • 2010
  • As the wind has become one of the fastest growing renewable energy sources, the key issue of wind energy conversion systems is how to efficiently operate the wind turbines in a wide range of wind speeds. Compared to fixed speed turbines, variable speed wind turbines feature higher energy yields, lower component stress and fewer grid connection power peaks. Generally, measurement of wind speed is required for the control of variable speed wind turbine system. However, wind speed measured by anemometers is not accurate owing to various reasons. In this work, a new control algorithm for variable speed wind turbine system based on Kalman filter which can be used for the estimation of wind speed and artificial neural network which can generate optimum rotor speed is proposed. Also, to verify the feasibility of the proposed scheme, various simulation studies are carried out by using Simulink in Matlab.

Basic Study on Radio-Wave Interference Assessment of Wind Turbines (풍력발전기에 의한 전파간섭 영향평가 기초연구)

  • Kim, Hyun-Goo;Kim, Hyo-Tae
    • 한국신재생에너지학회:학술대회논문집
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    • 2006.11a
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    • pp.305-306
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    • 2006
  • This paper introduces a radio-wave interference assessment of wind turbines that were planned to be installed at Homi-Cape in Pohang region where wind resource has been evaluated worthwhile developing a wind farm. In that area, AM radio station with two antennas and a harbor radar facility are located so that radio-wave coupling is inevitable if the wind farm is designed without considering radio-wave environmental impact. A low-frequency analysis using MoM (Method of Moment) is used to examine interference effect caused by wind turbines and an optimal layout minimizes coupling effect is presented.

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Technique of Medern Wind Power Generation (현대의 풍력발전 기술)

  • Kim, Jeong-Hwan;Kim, Yoon-Hae;Lee, Young-Ho
    • The KSFM Journal of Fluid Machinery
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    • v.4 no.3 s.12
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    • pp.62-77
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    • 2001
  • The modern wind turbines are widely used as important natural energy sources for the electric generation in western countries and some Asian nations. They are commercially matured and progressive and clear policy for the more development with higher technical purposes is maintained throughout the world. Modern wind turbines produce nearly 2000 kW output in their largest sizes and this trend increases up to more powerful power and ultimate utilization of wind energy favoured by clean natural energy. This article has the points of reviewing the states of the art of modern wind turbines with their present technical directions toward next generation version. Some descriptionsare given for easy understanding of the turbine components and related fluid mechanics concerned. The general outlines of policy taken over some countries are also introduced.

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Power Regulation of Variable Speed Wind Turbines using Pitch Control based on Disturbance Observer

  • Joo, Young-Jun;Back, Ju-Hoon
    • Journal of Electrical Engineering and Technology
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    • v.7 no.2
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    • pp.273-280
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    • 2012
  • Most variable speed wind turbines have pitch control mechanisms and one of their objectives is to protect turbines when the wind speed is too high. By adjusting pitch angles of wind turbine, the inlet power and the torque developed by the turbine are regulated. In this paper, the difference between the real wind speed and its rated value is regarded as a disturbance, and a component called disturbance observer (DOB) is added to the pre-designed control loop. The additional DOB based controller estimates the disturbance and generates a compensating signal to suppress the effect of disturbance on the system. As a result, the stability and the performance of the closed loop system guaranteed by an outer-loop controller (designed for a nominal system without taking into account of disturbances) are approximately recovered in the steady state. Simulation results are presented to verify the performance of the proposed control scheme.

A Study on Configuration of Small Wind Turbines for Maximum Capacity of Wind Power Systems Interconnected With a Building (빌딩 내 최대 풍력발전설비 연계를 위한 소형풍력발전원 구성에 관한 연구)

  • Lee, Yeo-Jin;Kim, Sung-Yul
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.66 no.4
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    • pp.605-612
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    • 2017
  • One of the biggest environmental issues that our world has been facing is climate change. In order to cope with such environmental issues, the world is putting a great deal of effort into energy conservation. The building sector, in particular, consumes 36% of the energy consumed worldwide and emits considerable amount of greenhouse gases. Therefore, introduction of renewable energies in the building sector is highly recommended. Renewable energy sources that can be utilized in the building sector include sunlight, solar heat, geothermal heat, fuel cells and wind power. The wind power generation system which converts wind energy into electrical energy has advantages in that wind is an unlimited and pollution-free resource. It is suitable to be connected to existing buildings because many years of operational experience and the enhanced stability of the system have made it possible to downsize the electrical generator. In case of existing buildings, it is necessary to consider the live loads of the buildings to connect the wind power generation system. This paper, through the connection of the wind power generation with existing buildings, promotes reduction of greenhouse gas emissions and energy independence by reducing energy consumption in the building sector. In order to connect the wind power generation system with an exciting building, the live load of the building and the area of the rooftop should be considered. The installable model is selected by comparing the live load of the building and the load of the wind power generation system. The maximum number of the wind turbines that can be installed is obtained by considering the separation distance between the wind turbines within the area of the rooftop. Installations are divided into single installations and multiple installations of two different types of wind turbines. After determining the maximum installable number, the optimal model that can achieve the maximum annual power generation will be selected by comparing the respective total annual amount of the power generation of different models.