• Title, Summary, Keyword: Wind Turbine

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A study on load evaluation and analysis for foundation of the offshore wind turbine system (해상풍력 하부구조물 하중영향평가 및 해석기술연구)

  • Kwon, Daeyong;Park, Hyunchul;Chung, Chinwha;Kim, Yongchun;Lee, Seungmin;Shi, Wei
    • 한국신재생에너지학회:학술대회논문집
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    • pp.184.2-184.2
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    • 2010
  • With growing of wind turbine industry, offshore wind turbine system is getting more attention in recent years. Foundation of the offshore wind turbine plays a key role in stability of whole system. In this work, 5MW NREL reference wind turbine with rated speed of 11.4m/s is used for load calculation. Wind loads and wave loads are evaluated using GH-Bladed (Garard Hassan) and FAST (NREL). Additionally, FE simulation is carried out to investigate the wave effect on the support structure. Meanwhile, this work is trying to systematize and optimize load cases simulation for foundation of wind turbine system.

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Adaptive Control of Pitch Angle of Wind Turbine using a Novel Strategy for Management of Mechanical Energy Generated by Turbine in Different Wind Velocities

  • Hayatdavudi, Mahdi;Saeedimoghadam, Mojtaba;Nabavi, Seyed M.H.
    • Journal of Electrical Engineering and Technology
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    • v.8 no.4
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    • pp.863-871
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    • 2013
  • Control of pitch angle of turbine blades is among the controlling methods in the wind turbines; this measure is taken for managing mechanical power generated by wind turbine in different wind velocities. Taking into account the high significance of the power generated by wind turbine and due to the fact that better performance of pitch angle is followed by better quality of turbine-generated power, it is therefore crucially important to optimize the performance of this controller. In the current paper, a PI controller is primarily used to control the pitch angle, and then another controller is designed and replaces PI controller through applying a new strategy i.e. alternating two ADALINE neural networks. According to simulation results, performance of controlling system improves in terms of response speed, response ripple, and ultimately, steady tracing error. The highly significant feature of the proposed intelligent controller is the considerable stability against variations of wind velocity and system parameters.

Load Measurements of 100 kW Wind Turbine (100 kW급 풍력발전기의 하중 측정)

  • Bae, Jae-Sung;Kim, Sung-One;Kyong, Nam-Ho
    • Journal of the Korean Solar Energy Society
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    • v.24 no.4
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    • pp.27-33
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    • 2004
  • Mechanical load measurements on blade and tower of Vestas 100 kW wind turbine has been reformed in Wollyong test site, Jeju island. The experimental procedure for the measurement of wind turbine loads, such as edgewise(lead-lag) bending moment, flapwise bending moment, and tower base bending moment, has been established. The test facilities consisting of strain-gauges, telemetry and T-Mon system are installed in the wind turbine. Strain gauges are on-site calibrated against load cell prior to monitoring the wind turbine loads. Using the test setup, the loads on the components are being measured and analysed for various external conditions of the wind turbine. A set of results for near rated wind speed has been presented in this paper.

Comparison of Operating Characteristics for DFIG and FSIG wind Turbine Systems with Respect to Variable Interconnecting Line Conditions (연계선로의 조건 변화에 따른 DFIG와 FSIG 풍력발전시스템의 운전특성 비교)

  • Ro, Kyoung-Soo;Kim, Tae-Ho
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.24 no.9
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    • pp.8-15
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    • 2010
  • This paper analyzes the steady-state output characteristics of variable-speed wind turbine systems using doubly-fed induction generators(DFIG) compared with fixed-speed induction generator(FSIG) wind turbine systems. It also presents simulations of a grid-connected wind turbine generation system for dynamics analysis on MATLAB/Simulink and compares the responses between DFIG and FSIG wind turbine systems with respect to wind speed variation, impedance changes and X/R ratio changes of interconnecting circuits. Simulation results show the variation of generator's active output, terminal voltage and fault currents at the interconnecting point. Case studies demonstrate that DFIG wind turbine systems illustrate better performance to 3-phase fault than FSIG's.

A Study on the Improvement of the Rotor Shape for Improving Performance of Small Wind Turbine with Vertical Axis (수직축 소형 풍력터빈 성능 향상을 위한 로터 형상 개선에 대한 연구)

  • Kim, C.J.;Kim, J.U.;Paek, I.S.;Kim, C.J.
    • Journal of Industrial Technology
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    • v.37 no.1
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    • pp.37-40
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    • 2017
  • This study was carried out to improve the performance of a vertical-axis micro wind turbine. It is unique in that it has two identical generators on both sides of the main shaft. Also it has a C shape frame to fix the generators and the main shaft firmly and to provide a connection to a tower. Performance analysis of the wind turbine rotor was performed using Qblade, which is an analysis program for vertical axis wind turbines and freeware. Based on the analysis results, the blade airfoil, the chord length, and the rotor size were modified to improve the performance of the rotor. The modification was found to increase the performance of the wind turbine and to reach the targeted rated power.

Experimental and Numerical Studies on the Possibility of Duct Flow Low-power Generation Using a Butterfly Wind Turbine

  • Hara, Yutaka;Kogo, Shohei;Takagaki, Katsuhiro;Kawanishi, Makoto;Sumi, Takahiro;Yoshida, Shigeo
    • International Journal of Fluid Machinery and Systems
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    • v.10 no.1
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    • pp.19-29
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    • 2017
  • An objective of this study is to demonstrate the validity of using a small wind turbine to recover the fluid energy flowing out of an exhaust duct for the generation of power. In these experiments, a butterfly wind turbine of a vertical axis type (D = 0.4 m) is used. The output performance is measured at various locations relative to the exit of a small wind tunnel (W = 0.65 m), representing the performance expected in an exhaust duct flow. Two-dimensional numerical analysis qualitatively agrees with the experimental results for the wind turbine power coefficient and rate of energy recovery. When the turbine is far from the duct exit (more than 2.5 D), an energy recovery rate of approximately 1.3% is obtained.

A review of wind-turbine structural stability, failure and alleviation

  • Rehman, Shafiqur;Alam, Md. Mahbub;Alhems, Luai M.
    • Wind and Structures
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    • v.30 no.5
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    • pp.511-524
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    • 2020
  • Advancements in materialistic life styles and increasing awareness about adverse climatic changes and its negative effects on human life have been the driving force of finding new and clean sources of energy. Wind power has become technologically mature and commercially acceptable on global scale. However, fossil fuels have been the major sources of energy in most countries, renewable energy (particularly wind) is now booming worldwide. To cope with this wind energy technology, various related aspects have to be understood by the scientific, engineering, utility, and contracting communities. This study is an effort towards the understanding of the (i) wind turbine blade and tower structural stability issues, (ii) turbine blade and tower failures and remedial measures, (iii) weather and seismic effects on turbine blade and tower failures, (iv) gear box failures, and (v) turbine blade and tower failure analysis tools.

Voltage Impacts of a Variable Speed Wind Turbine on Distribution Networks

  • Kim, Seul-Ki;Kim, Eung-Sang
    • KIEE International Transactions on Power Engineering
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    • v.3A no.4
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    • pp.206-213
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    • 2003
  • The main purpose of this paper is to present a simulation model for assessing the impacts of a variable speed wind turbine (VSWT) on the distribution network and perform a simulation analysis of voltage profiles along the wind turbine installed feeder using the presented model. The modeled wind energy conversion system consists of a fixed pitch wind turbine, a synchronous generator, a rectifier and a voltage source inverter (VSI). Detailed study on the voltage impacts of a variable speed wind turbine is conducted in terms of steady state and dynamic behaviors. Various capacities and different modes of variable speed wind turbines are simulated and investigated. Case studies demonstrate how feeder voltages are influenced by capacity and control modes of wind turbines and changes in wind speed under different network conditions. Modeling and simulation analysis is based on PSCAD/EMTDC a software package.

A Study on the Assessment of Operational Capacity Limit of Wind Turbine for the Frequency Stability of Jeiu Island System (제주계통 단독운전 시 주파수 안정도 유지를 위한 풍력발전 운전용량 산정 방법에 관한 연구)

  • Hwang, Kyo-Ik;Chun, Yeong-Han
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.56 no.2
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    • pp.233-239
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    • 2007
  • As the Kyoto Protocol, which aims at reducing greenhouse gases in accordance to the UNFCCC, came into force, research on environment friendly energy resources has been a matter of concern worldwide. As a general power generation system, among renewable energy resources, that is interconnected and operated with power system, the wind turbine is emerging as an effective alternative. Since power capacity of the wind turbine has been steadily increasing and its relative importance is also increasing in total facility capacity, we cannot ignore its effect. Because controlling generation output in the wind turbine is not as easy as in the synchronous machine due to its facility characteristics and it generates irregular output fluctuations when interconnected with power system, system interconnection was difficult. But the effect of large capacity wind turbine on isolated power system like Jeju island is serious problem on the frequency stability. Accordingly, it is necessary to analyze the effects of wind turbine on system interconnection and assess the optimum capacity of wind turbine that satisfies the most important principle of stable power supply. This paper have analyzed the effects of wind turbine capacity increases on the system and suggested the method of the capacity to achieve its steady operation. And It is applied to the Jeju island.

Wind Turbine Power Performance Testing using Nacelle Transfer Function (나셀 변환 함수를 이용한 풍력터빈 출력성능평가)

  • Kim, Hyeon-Wu;Ko, Kyung-Nam;Huh, Jong-Chul
    • Journal of the Korean Solar Energy Society
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    • v.33 no.4
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    • pp.51-58
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    • 2013
  • A study on power performance testing of a wind turbine which has no met-mast at a distance of 2~4 rotor diameter was carried out using the Nacelle Transfer Function, NTF, according to IEC 61400-12-2. The wind data for this study was measured at HanKyoung wind farm of Jeju Island. The NTF was modeled using the correlation between wind speeds from the met-mast and from the wind turbine nacelle within 2~4 rotor diameter from the met-mast. The NTF was verified by the comparison of estimated Annual Energy Productions, AEPs, and binned power curves. The Nacelle Power Curve, NPC, was derived from the nacelle wind speed data corrected by NTF. The NPC of wind turbine under test and the power curve offered by the turbine manufacturer were compared to check whether the wind turbine is properly generating electricity. Overall the NPC was in good agreement with the manufacturer's power curve. The result showed power performance testing for a wind turbine which has no met-mast at a distance of 2~4 rotor diameter was successfully carried out in compliance with IEC 61400-12-2.