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

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Simulation Modeling cnd Analysis of Pitch Controlled Variable Speed Wind Turbine System (피치제어형 가변속 풍력터빈 시스템의 시뮬레이션 모델링과 해석)

  • Kim, Eel-Hwan;Kang, Geong-Bo
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.19 no.2
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    • pp.124-130
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    • 2005
  • This paper presents the simulation modeling and analysis of variable wind speed turbine system(VWTS) using Psim program In the simulation, using the Vestas V47 VWTS located in Hangwon wind farm in Jeju-Do as a model, wind model, blade model, pitch control model and grided connected generator are modeled. The VWTS is controlled by the optimal pitch angle for maximum output power under the rated wind speed and for the rated output power over the rated wind speed. To verify the effectiveness of proposed method, simulation results are compared with the actual data from the model system According to the comparison of these results, this method shows excellent performance. So it is very useful for understanding and applications of wind power control system.

PSCAD/EMTDC BASED MODELING AND ANALYSIS OF A GRID-CONNECTED VARIABLE SPEED WIND ENERGY CONVERSION SCHEME (계통연계형 가변속 풍력발전방식의 PSCAD/EMTDC 모의 및 해석)

  • 김슬기;김응상
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.52 no.8
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    • pp.413-419
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    • 2003
  • The paper presents a simulation model and analysis of a grid-connected variable speed wind energy conversion scheme (VSWECS) using the PSCAD/EMTDC software. The modeled system uses a variable speed drive, a fixed pitch angle, a synchronous generator as a wind generator and an AC-DC-AC conversion scheme, which facilitates the wind generation to efficiently operate under varying wind speed while connected to the distribution network. The power output of the WECS is controlled by the AC-DC-AC conversion scheme, the objective of which is to capture the maximum active power under varying wind conditions and to keep the voltage magnitude of the terminal bus at a specific level. Aerodynamic models are applied for a wind turbine model. An simulation analysis of the scheme in terms of its responding to wind variations is also presented.

A Fuzzy Logic Controller Design for Maximum Power Extraction of Variable Speed Wind Energy Conversion System (가변 풍력발전 시스템의 최대출력 제어를 위한 Fuzzy 제어기 설계)

  • Kim Jae-gon;Huh Uk-youl;Kim Byung-yoon
    • The Transactions of the Korean Institute of Electrical Engineers D
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    • v.53 no.11
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    • pp.753-759
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    • 2004
  • This paper presents a modeling and simulation of a fuzzy controller for maximum power extraction of a grid-connected wind energy conversion system with a link of a rectifier and an inverter. It discusses the maximum power control algorithm for a wind turbine and proposes, in a graphical form, the relationships of wind turbine output, rotor speed, power coefficient, tip-speed ratio with wind speed when the wind turbine is operated under the maximum power control. The control objective is to always extract maximum power from wind and transfer the power to the utility by controlling both the pitch angle of the wind turbine blades and the inverter firing angle. Pitch control method is mechanically complicated, but the control performance is better than that of the stall regulation method. The simulation results performed on MATLAB will show the variation of generator's rotor angle and rotor speed, pitch angle, and generator output.

Characteristics of Filters for Signal Processing Applied to Wind Turbine Controllers (풍력발전 제어에 적용되는 계측신호처리 필터에 대한 특성 고찰)

  • Moon, Seok-Jun;Shin, Yun-Ho;Chung, Tae-Young;Rim, Chae-Whan;Ryu, Ji-Yune
    • New & Renewable Energy
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    • v.7 no.4
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    • pp.58-65
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    • 2011
  • In variable-speed variable-pitch wind turbines, the conventional approach for controlling power-production operation relies on a generator-torque controller and a rotor-collective blade-pitch controller. Both controllers use the generator speed measurement as the sole feedback input. In order to mitigate unwanted excitation of the control system, many filters are adopted. In this study, the characteristics of some filters for signal processing are investigated based on frequency response function. They include low-pass filters, band-pass filters, and notch filters. Especially, this study focuses on design parameters of their filters.

Characteristics of Filters for Signal Processing Applied to Wind Turbine Controllers (풍력발전 제어에 적용되는 계측신호처리 필터에 대한 특성 고찰)

  • Moon, Seokjun;Shin, Yunho;Chung, Taeyoung;Rim, Chaewhan;Ryu, Jiyune
    • 한국신재생에너지학회:학술대회논문집
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    • 2011.11a
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    • pp.36.2-36.2
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    • 2011
  • In variable-speed variable-pitch wind turbines, the conventional approach for controlling power-production operation relies on a generator-torque controller and a rotor-collective blade-pitch controller. Both controllers use the generator speed measurement as the sole feedback input. In order to mitigate unwanted excitation of the control system, many filters are adopted. In this study, the characteristics of some filters for signal processing are investigated based on frequency response function. They include low-pass filters, band-pass filters, and notch filters. Especially, this study focuses on design parameters of their filters.

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LQR control of Wind Turbine (풍력터빈의 LQR 제어)

  • Nam, Yoon-su;Jo, Jang-whan;Lim, Chang-Hee;Park, Sung-su;Bottasso, Carlo L.
    • Journal of Wind Energy
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    • v.2 no.1
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    • pp.74-81
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    • 2011
  • This paper deals with the application of LQ control to the power curve tracking control of wind turbine. However, two more additional tasks are required to apply the LQR theory to wind turbine control. One is the tracking problem instead of regulation, because the wind turbine is controlled as variable speed and variable pitch. The other is LQ integral control., because the rotor speed should be tightly controlled without any steady state error. Starting from the analysis of wind characteristics, design requirement of a wind turbine control system is defined. A design procedure of LQ tracking with integral control is introduced. The performance of LQ tracking system is analyzed and evaluated by numeric simulation.

Experimental Study on Efficiency of Floating Vertical Axis Wind Turbine with Variable-Pitch (부유식 가변 피치형 수직축 풍력발전기의 발전효율에 관한 실험 연구)

  • Kim, Jae-Heui;Jo, Hyo-Jae;Hwang, Jae-Hyuk;Jang, Min-Suk;Lee, Byeong-Seong
    • Journal of Ocean Engineering and Technology
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    • v.32 no.3
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    • pp.202-207
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    • 2018
  • This paper presents the efficiency of a floating vertical axis wind turbine with variable-pitch. A model was designed to use the lift force and drag force for blades with various pitch angles. The blade's pitch angle is controlled by the stopper. To validate the efficiency of the wind turbine discussed in this paper, a model test was carried out through a single model efficiency experiment and wave tank experiment. The parameters of the single model efficiency experiment were the wind speed, electronic load, and pitch angle. The wave tank experiment was performed using the most efficient pitch angle from the results of the single model efficiency experiment. According to the results of the wave tank experiment, the surge and pitch motion of a structure slightly affect the efficiency of a wind turbine, but the heave motion has a large effect because the heights of the wind turbine and wind generator are almost the same.

Sliding Mode Controller for Torque and Pitch Control of PMSG Wind Power Systems

  • Lee, Sung-Hun;Joo, Young-Jun;Back, Ju-Hoon;Seo, Jin-Heon;Choy, Ick
    • Journal of Power Electronics
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    • v.11 no.3
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    • pp.342-349
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    • 2011
  • We propose a torque and pitch control scheme for variable speed wind turbines with permanent magnet synchronous generator (PMSG). A torque controller is designed to maximize the power below the rated wind speed and a pitch controller is designed to regulate the output power above the rated wind speed. The controllers exploit the sliding mode control scheme considering the variation of wind speed. Since the aerodynamic torque and rotor acceleration are difficult to measure in practice, a finite time convergent observer is designed which estimates them. In order to verify the proposed control strategy, we present stability analysis as well as simulation results.

Modeling and Analysis of Variable Wind Speed Turbine System Using Back to Back Converter (Back to bock 컨버터를 갖는 가변속 풍력터빈 시스템의 모델링과 해석)

  • Kim, Eel-Hwan;Kang, Keong-Bo;Kim, Jae-Hong;Moon, Sang-Ho;Oh, Sung-Bo;Kim, Se-Ho
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.19 no.8
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    • pp.150-157
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    • 2005
  • This paper presents the simulation modeling and analysis of variable wind speed turbine system(VWTS) using the doubly fed induction generator(DFIG) connected the back to back converter system in the rotor side. In the simulation, using the model system which has the 660[kW] rated power, blade control and the dual converter system are modeled for verifying the control characteristics. The VWTS is controlled by the optimal pitch angle for maximum output power under the rated wind speed, and for the rated output power over the rated wind speed. And also power factor is controlled by the reactive power. To verify the effectiveness of the proposed method, simulation results are compared with the actual data from the V47 VWTS located in Hangwon wind farm in Jeju-Do. According to the comparison of these results, this method shows excellent performance.

A Robust Pitch Control of Wind Turbine Systems (풍력 터빈 시스템의 강인 피치 제어)

  • Han, Myung-Chul;Sung, Chang-Min;Hwang, Wook
    • Journal of the Korean Society for Precision Engineering
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    • v.30 no.12
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    • pp.1287-1293
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    • 2013
  • In this paper, we consider variable speed wind turbine systems containing uncertain elements. Though PI controller is generally used for pitch control, it cannot guarantee a stability and performance of the complicated wind turbine systems. A robust pitch control scheme is proposed to regulate the electric power output above the rated wind speed. The pitch controller is designed in order to guarantee uniform boundedness and uniform ultimate boundedness based on the bound values of the set where the uncertainties are laid or moves. In order to verify the proposed control scheme, we present stability analysis and simulation results using Matlab/Simulink.