• Title/Summary/Keyword: Rated wind speed

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A Basic Study on the Desist of Vertical Axis Darrieus Turbine for Wind-Power Generating System (수직축 Darrieus 풍력발전 시스템의 설계에 관한 기초연구)

  • Seo, Young-Taek;Kim, Gi-Seung;Oh, Chul-Soo
    • Proceedings of the KIEE Conference
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    • 1994.07a
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    • pp.82-84
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    • 1994
  • This paper presents a design of vertical axis Darrieus wind turbine for wind-power generating system. The wind turbine consists of two troposkien blades, diameter is 10m approximately, and chord length 380mm, tip ratio speed 4. The design of turbine is laid for the main data of rated wind speed 10m/s, turbine speed 78rpm, the generating power is estimated to 25kW, and this is contorted to commercial power line by means of three phase synchronous generator-inverter system.

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A Study on the Effect of Low Pass Filter and Drive Train Damper for the NREL 5MW Wind Turbine Control (NREL 5MW 풍력터빈 제어용 저주파 통과 필터와 드라이브 트레인 댐퍼의 효과 고찰)

  • Lim, Chae-Wook
    • Journal of the Korean Society of Industry Convergence
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    • v.24 no.4_2
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    • pp.443-451
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    • 2021
  • It is essential to examine and analyze the power output and load responses together using real-world turbulent wind speeds. In this paper, the power controller and the drive train damper are simultaneously considered using the NREL 5MW wind turbine model, and the damage equivalent load(DEL) of the low speed shaft torque and power output responses according to the natural frequency of the second order low pass filter are simultaneously investigated. Numerical testing is carried out above rated wind speed using commercially available Bladed software. From the viewpoints of DEL reduction of the drive train shaft torque and power output responses, it is shown that the natural frequency of the low pass filter is appropriately about 6 to 10rad/s. And the reduction ratio of the DEL of the low-speed shaft torque decreases as the wind speed becomes higher, and it is confirmed that the reduction ratio is limited to about 20% at high wind speeds.

Constant power. high power factor drive of DFIG for wind power generation in the wide wind speed (넓은 풍속에서의 풍력발전용 권선형 유도발전기의 정출력.고역률 운전)

  • Lee, Woo-Suk;Kim, Kwang-Tae;Chung, Soon-Yong;Shon, Je-Bong;Bae, Jong-Moon
    • Proceedings of the KIEE Conference
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    • 2000.07b
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    • pp.693-695
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    • 2000
  • Wide operating range and speed control is needed for wind power generating and a Doubly Fed Induction Generator(DFIG) has good adaptivity for that purpose. This paper deals with power and power factor control using the Grid connected DFIG in the wide speed regions, by controlling frequency and voltage fed to the rotor. Power flow of the DFIG and steady-state algebraic equations of the equivalent circuit are analyzed. For a normal operating region, in which the generator ratings were not exceeded, the rotor current was either less than or equal to the rated value. Accordingly, the optimal power factor can be selected relative to the permissible rated current at the rotor coil which controls the magnitude of the injected rotor voltage to the rotor according to a given rotor frequency.

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A Study on Properties of Torque Control for Wind Turbine (풍력터빈 토크제어의 특성 고찰)

  • Lim, Chae-Wook
    • Journal of Institute of Control, Robotics and Systems
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    • v.15 no.12
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    • pp.1157-1162
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    • 2009
  • The aerodynamic torque and power caused by the interaction between the wind and blade of wind turbine are highly nonlinear. For this reason, the overall dynamic behaviors of wind turbine have nonlinear characteristics. The aerodynamic nonlinearity also affects properties of torque control for wind turbine. In this paper, the nonlinear aerodynamic property according to the wind speed below rated power and its effects on the torque control system are investigated. Nonlinear parameter representing change of aerodynamic torque with respect to rotor speed is obtained by linearization technique. Effects of this aerodynamic nonlinear parameter on the closed-loop torque system with PI controller for an 1.5 MW wind turbine are presented.

Electromagnetic Field Analysis of 230 kW-class Low Wind Speed Medium Wind Turbine for Island-area Application (도서지역 적용을 위한 230 kW급 저풍속 중형 풍력발전기의 전자장해석)

  • Choi, Mansoo;Choi, Hyewon;Lee, Changmin;Choi, Hyenjun
    • New & Renewable Energy
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    • v.16 no.2
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    • pp.14-19
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    • 2020
  • Recently, a project to build a carbon zero island with no carbon emissions has been carried out by replacing diesel generators with renewable energy sources in island areas where diesel generators supplied local loads as independent systems. To minimize damage to the lives of islanders, low noise wind generators should be installed by adjusting the rated speed. In islands with low loads, wind turbines that are more efficient than medium-sized wind turbines should be installed. In this study, the generator field analysis and characteristics were analyzed to develop 230 kW-class low wind medium-wind turbine technology. The electromagnetic field analysis program used Maxwell. As a result, the cogging torque was reduced, and the initial maneuver wind speed and loss value were lowered. Hence, the output amount was increased with high efficiency.

Design of Power and Load Reduction Controller for a Medium-Capacity Wind Turbine (중형 풍력터빈의 출력 및 타워 하중저감 제어기 설계)

  • Kim, Kwansu;Paek, Insu;Kim, Cheol-Jin;Kim, Hyun-Gyu;Kim, Hyoung-Gil
    • Journal of the Korean Solar Energy Society
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    • v.36 no.6
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    • pp.1-12
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    • 2016
  • A control algorithm for a 100 kW wind turbine is designed in this study. The wind turbine is operating as a variable speed variable pitch (VSVP) status. Also, this wind turbine is a permanent magnet synchronous generator (PMSG) Type. For the medium capacity wind turbine considered in this study, it was found that the optimum tip speed ratios to achieve the maximum power coefficients varied with wind speeds. Therefore a commercial blade element momentum theory and multi-body dynamics based program was implemented to consider the variation of aerodynamic coefficients with respect to Reynolds numbers and to find out the power and thrust coefficients with respect tip speed ratio and blade pitch angles. In the end a basic power controller was designed for below rated, transition and above rated regions, and a load reduction algorithm was designed to reduce tower vibration by the nacelle motion. As a result, damage equivalent Load (DEL) of tower fore-aft has been reduced by 32%. From dynamic simulations in the commercial program, the controller was found to work properly as designed. Experimental validation of the control algorithm will be done in the future.

Wind Speed Estimation using Regression Method for Maximum Power Control (리그레션 방법을 이용한 최대출력제어 풍속예측)

  • Ko, SeungYoun;Kim, Ho-Chan;Huh, Jong-Chul;Kang, Min-Jae
    • Journal of the Korean Institute of Intelligent Systems
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    • v.25 no.4
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    • pp.327-333
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    • 2015
  • Wind turbines, in the case of less than rated wind speed, is controlled to achieve maximum power. MPC(Maximun Power Control) method, by controlling the rotational speed of the generator, is a method to achieve maximum power but should know the wind speed. However, for several reasons, there have been proposed methods of estimating the wind speed rather than measuring wind speed. TSR(Tip Speed Ratio) is needed to know to estimate the wind speed. However, a complex interaction formula has to be solved to find a TSR. Therefore, many methods have been suggested to solve a complex interaction formula. In this paper, the new method has been proposed to simplify the complicated interaction formula by using the regression method. Matlab/Simulink is used to simulate and to verify the proposed method.

Comparison of Response Properties Determined in Two Torque Control Methods for a 2.75-MW Wind Turbine Under Turbulence Wind Speed (난류풍속에 대한 MW급 풍력터빈의 토크제어 방법에 따른 응답 특성 비교)

  • Lim, Chae-Wook;Seo, Kang-Yoon
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.34 no.12
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    • pp.1885-1891
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    • 2010
  • Torque control of wind turbines is important when the wind speed is below the rated speed. The main objective of torque control is to extract the maximum power from the potential aerodynamic power of the wind. Torque control methods for wind turbines are classified as torque-mode control and speed-mode control. In torque-mode control, which is well known and traditionally used in many wind turbines, the torque demand of the generator is proportional to the square of the generator speed. In speed-mode control, a PI controller is used to generate the appropriate torque demand of the generator. In this study, the two torque control methods mentioned above are applied to a 2.75-MW wind turbine; simulation results for real turbulence wind speeds are presented, and the response properties are compared.

Design Development Test for Composite Wind Turbine Blade (풍력발전기용 복합재 윈드터빈 블레이드의 설계 개발 시험)

  • Lee Chung-Hun;Jung Sung-Hoon;Park Ji-Sang;Kim Tae-Wook
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2004.04a
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    • pp.22-25
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    • 2004
  • This paper describes method and procedure for DDT (Design Development Test) of composite wind turbine blade composites. The test type of DDT is bending test, such as cantilever beam, based on the rated wind speed of wind power generation system. DDT was carried out in order to compare with the result of FEM analysis, characterize structural stability, verify manufacturing process and review test method of full scale blade.

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On the Analysis of Vertical-axis Wind Rotor (수직축 풍력발전기의 해석에 관하여)

  • ;;Lee, Chung-Oh
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.3 no.2
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    • pp.60-67
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    • 1979
  • Aerodynamic forces acting on a curved blade are computed theoretically taking into account the variation of wind speed over the blade to investigate the performance of a vertical axis wind rotor. It is shown that the rotor does not self start at the rated wind speed without a supplementary starting device and that most of the power output is contributed by the central portion of the rotor, and the use of spoilers for limiting the maximum rotational speed is needed for safety. It is also shown that provision of skew angle to the blade does not improve the starting characterstics and only reduces the maximum power output. The effects of geometric variables such as skew angle, blade solidity and ratio of the rotor height to diameter are also discussed.