• Title/Summary/Keyword: Variable-Speed Variable Pitch

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A Study on the modeling and operation control of a variable speed synchronous wind power system (가변속 동기형 풍력발전 시스템 모델링 및 운전제어에 대한 연구)

  • Huh, Hyun;Lee, Jaehak
    • The Journal of the Korea institute of electronic communication sciences
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    • v.10 no.8
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    • pp.935-944
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    • 2015
  • This study performs the dynamic modeling and the simulation of variable speed wind power system and implements the models of wind speed, wind turbine & PMSG, and MPPT & pitch control as well. The simulation of wind turbine was performed by using the power coefficient and other simulation parameters which were extracted with reference to the commercial 5MW class wind turbine data. As the result of this simulation, MPPT control is confirmed, maintaining the maximum power coefficient as far as the rated speed 12[m/s]. Over 12[m/s] wind speed, this wind power system makes it possible to keep the stable output by controlling the pitch angle.

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 Wind Turbine Blade Optimization and Pitch Control Using the Hybrid Genetic Algorithm (혼합형 유전 알고리즘을 이용한 풍력발전기용 블레이드 최적설계 및 피치제어에 관한 연구)

  • Kang, Shin-Jae;Kim, Ki-Wan;Ryu, Ki-Wahn;Song, Ki-Jung
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.30 no.6
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    • pp.7-13
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    • 2002
  • This paper introduced a new hybrid genetic algorithm, verified its performance, and applied it to the optimization of blade design and pitch control for 30kW pitch-controlled variable-speed horizontal-axis wind turbine system to determine the optimum blade chord and twist distributions that maximize the energy production for a given Weibull wind distribution and the optimum blade pitch angles that maintain constant power output.

Control System Design of NREL 5MW Wind Turbine (NREL 5MW 풍력터빈의 제어시스템 설계)

  • Nam, Yoonsu;Im, Changhee
    • Journal of the Korean Solar Energy Society
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    • v.32 no.5
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    • pp.31-40
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    • 2012
  • This paper introduces a methodology for NREL 5MW wind turbine, which is the variable speed and variable pitch(VSVP) control system. This control strategy maximizes the power extraction capability from the wind in the low wind speed region and regulates the wind turbine power as the rated one for the high wind speed region. Also, pitch control efficiency is raised by using pitch scheduling.Torque schedule is made of torque table depending on the rotor speed. Torque control is used for vertical region in a torque-rotor speed chart. In addition to these, mechanical loads reduction using a drive train damper and exclusion zone on a torque schedule is tried. The NREL 5MW wind turbine control strategy is comprised by the generator torque and blade pitch control. Finally, proposed control system is verified through GH Bladed simulation.

Aerodynamic Characteristics of Several Airfoils for Design of Passive Pitch Control Module of 10 kW Class (10kW 급 풍력 블레이드의 수동형 피치제어 모듈의 설계를 위한 여러가지 익형의 공력 특성에 관한 연구)

  • Kang, Sang Kyun;Lee, Ji Hyun;Lee, Jang-Ho
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.38 no.6
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    • pp.609-617
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    • 2014
  • Even though the variable pitch control of a wind turbine blade is known as an effective component for power control over the rated wind speed, it has limited applicability to small wind turbines because of its relatively high cost on the price of small wind turbine. Instead, stall control is generally applied in the blade design without any additional cost. However, stall delay can frequently be caused by high turbulence around the turbine blade, and it can produce control failures through excessive rotational speed and overpowering the electrical generator. Therefore, a passive pitch control module should be considered, where the pitch moves with the aerodynamic forces of the blade and returns by the elastic restoring force. In this study, a method to calculate the pitch moment, torque, and thrust based on the lift and drag of the rotating blade wing was demonstrated, and several effective wing shapes were reviewed based on these forces. Their characteristics will be estimated with variable wind speed and be utilized as basic data for the design of the passive pitch control module.

Dynamic Characteristic Analysis of a Wind Turbine Depending on Varying Operational Conditions (작동 조건 변화에 따른 풍력발전 시스템의 동적 특성 해석)

  • Nam, Yoon-Su;Yoon, Tai-Jun;Yoo, Neung-Soo
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.33 no.1
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    • pp.42-48
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    • 2009
  • A design methodology for control strategy and control structure gives a direct impact on wind turbine's performance and life cycle. A baseline control law which is a variable rotor speed and variable pitch control strategy is introduced, and a mathematic performance model of a wind turbine dynamics is derived. By using a numeric optimization algorithm, the steady state operating conditions of wind turbines are identified. Because aerodynamic interaction of winds with rotor blades is basically nonlinear, a linearization procedure is applied to analyze wind turbine dynamic variations for whole operating conditions. It turns out the wind turbine dynamics vary much depending on its operating condition.

Development Status of 3MW Class Offshore Wind Turbine (3MW급 해상 풍력발전시스템 개발현황)

  • Joo, Wan-Don;Park, Jeung-Hun;Choi, June-Hyug;Lim, Chae-Wook;Park, Jong-Po
    • 한국신재생에너지학회:학술대회논문집
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    • 2007.06a
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    • pp.366-369
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    • 2007
  • This paper presents the general results of the conceptual design of a 3MW class offshore wind turbine named WinDS 3000 under development. In WinDS 3000, an integrated drive train design, three stage gearbox and permanent magnet generator (PMG) with fully rated converters have been introduced. A pitch regulated variable speed power control with individual pitch control has been adopted to regulate rotor torque while generator reaction torque can be adjusted almost instantaneously by the associated power electronics. Through the introduction of WinDS 3000, it is expected that helpful to understanding of the development status of 3MW offshore wind turbine.

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An Investigation on Nonlinear Characteristics of Aerodynamic Torque for Variable-Speed Variable-Pitch Wind Turbine (가변속도-가변피치 풍력터빈의 공기역학적 토크의 비선형 특성에 관한 고찰)

  • Lim, Chae-Wook
    • The KSFM Journal of Fluid Machinery
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    • v.14 no.2
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    • pp.29-34
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    • 2011
  • Aerodynamic torque of wind turbine is highly nonlinear due to the nonlinear interactions between wind and blade. The aerodynamic nonlinearity is represented by nonlinear power and torque coefficients which are functions of wind speed, rotational speed of rotor, and pitch angle of blade. It is essential from the viewpoint of understanding and analysis of dynamic characteristics for wind turbine to linearize the aerodynamic torque and define aerodynamic nonlinear parameters as derivatives of aerodynamic torque with respect to the three parameters. In this paper, a linearization method of the aerodynamic torque from power coefficient is presented through differentiating it by the three parameters. And steady-state values of three aerodynamic nonlinear parameters according to wind speed are obtained and their nonlinear characteristics are investigated.

A study of Power Performance for 50kW Wind Turbine (50kW 풍력발전기의 출력 성능에 관한 연구)

  • Kim, Hyoung-Gil;Kong, Jeong-Sik;Kwon, Ki-Jin;Oh, Jin-Hun;Moon, Chae-Joo
    • Proceedings of the KIEE Conference
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    • 2015.07a
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    • pp.1068-1069
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    • 2015
  • Wind turbines have an enormous potential for decentralized electricity generation. In recent years, there has been an increasing worldwide interest in small/medium wind systems. This paper presents the results of power performance testing conducted on a 50 kW turbine located in Yeonggwang test-bed. The turbine system is a pitch, active yaw, variable speed, upwind, three blade with a direct drive PMSG. This thesis covers the operation of variable speed wind turbines with pitch-yaw control. The system considered is controlled to generate maximum energy while minimizing loads. The data include power, wind speed, and direction from meteorological towers, and nacelle anemometer readings and output from turbine. The analysis concentrates on the effect of the load on the power-wind speed curve of the turbine.

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Pitch Angle Control of Wind Turbine based on Variable PID Gains (가변적인 PID 이득에 기초한 풍력발전 시스템의 피치제어)

  • Ko, Jung-Min;Yang, Soo-Youg;Boo, Chang-Jin;Kim, Ho-Chan;Huh, Jong-Chul;Lee, Junghoon;Kang, Min-Jae
    • Journal of the Korean Institute of Intelligent Systems
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    • v.23 no.1
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    • pp.1-6
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    • 2013
  • For regulating generator speed above the rated wind, versatile methods have been published based on PID. However, these methods with the fixed PID gains could not guarantee that the controller works well in the whole area. In this paper, variable PID gain method has been suggested to overcome this problem. The sensitivity of power to blade pitch angle changes according to wind speed. The variable PID gain function has been derived from this sensitivity.