• Title/Summary/Keyword: Variable wind turbine

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A Method to Define Steady-State Curves for Variable-Speed Variable-Pitch Wind Turbine (가변속도-가변피치 풍력터빈의 정상상태 곡선 결정 방법)

  • Lim, Chae-Wook
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.33 no.11
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    • pp.894-899
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    • 2009
  • Aerodynamic power and torque of wind turbine are highly nonlinear and its operation mode depends on control strategies. Therefore, it is essential to define steady-state curves for the purpose of control and operation of wind turbine system. The steady-state curves of wind turbine can be defined by determining its operating points. In this paper, an algorithm to determine operating points of variable-speed variable-pitch wind turbine is presented on the basis of pitch-to-feather control strategy. And this algorithm is applied to obtain steady-state curves for an 1.5MW wind turbine.

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 design of vertical axis wind power generating system combined with Darrieus-Savonius for adaptation of variable wind speed (다변풍속 적응형 Darrieus-Sauonius 초합 수직푹 풍력발전 시스템의 설계)

  • 서영택;오철수
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.45 no.2
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    • pp.185-192
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    • 1996
  • This paper presents a design of vertical axis Darrieus wind turbine combine with Savonius for wind-power generating system to be adapted for variable wind speed. The wind turbine consists of two troposkien- and four Savonius-blades. Darrieus turbine is designed with diameter 9.4[m], chord length 380[mm], tip speed ratio 5. Savonius turbine is designed with diameter 1.8[m], height 2[m], tip speed ratio 0.95. The design of turbine is laid for the main data of rated wind speed 10[m/s], turbine speed 101.4[rpm]. The generating power is estimated to maximum power 20[kW], and this is converted to commercial power line by means of three phase synchronous generator-inverter system. Generating system is designed for operation on VSVF(variable speed variable frequency) condition and constant voltage system.

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Study on the Aerodynamics and Control Characteristics of 5 MW Wind Turbine (5MW급 풍력 터빈의 공력 및 제어 특성에 관한 연구)

  • Tai, Fengzhu;Kang, Ki-Won;Lee, Jang-Ho
    • New & Renewable Energy
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    • v.7 no.2
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    • pp.59-69
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    • 2011
  • 5MW wind turbine is regarded as a promising system for offshore wind farms in the western sea of Korean. And the wind turbine is developed in many companies but not much information is known about it. In this study, aerodynamics and control characteristics depending on several control methods is reviewed on 5MW wind turbine, in which configuration data of the turbine are used from the previous study of NREL. For the calculations, GH_Bladed, which is certificated software by GL, is used and compared with data from FAST code of NREL. This study shows that how much power production, and aerodynamic performances and loads can be obtained with different controls in the operation of 5MW wind turbine, which is expected to be useful in the design of the wind turbine system.

Modeling of a Variable Speed Wind Turbine in Dynamic Analysis

  • Kim, Seul-Ki;Kim, Eung-Sang;Jeon, Jin-Hong
    • KIEE International Transactions on Power Engineering
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    • v.4A no.2
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    • pp.51-57
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    • 2004
  • This paper describes the dynamic performance of a variable speed wind turbine system responding to a wide variety of wind variations. Modeling of the wind generation using power electronics interface is proposed for dynamic simulation analysis. Component models and equations are addressed and their incorporations into a transient analysis program, PSCAD/EMTDC are provided. A wind model of four components is described, which enables observing dynamic behaviors of the wind turbine resulting from wind variations. Controllable power inverter strategies are intended for capturing the maximum power under variable speed operation and maintaining reactive power generation at a pre-determined level for constant power factor control or voltage regulation control. The components and control schemes are modeled by user-defined functions. Simulation case studies provide variable speed wind generator dynamic performance for changes in wind speed

Verification of The Variable-Speed Wind Turbine Control System by Using the Simulator (시뮬레이터를 이용한 가변속 풍력발전기 제어시스템 검증)

  • Cha, Sam-Gon;Han, Sang-Yul;Cha, Jong-Hwan;Choi, Won-Ho;Lee, Seung-Kuh
    • 한국신재생에너지학회:학술대회논문집
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    • 2007.06a
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    • pp.370-373
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    • 2007
  • For the development of wind turbine, generally simulator is used. Simulator include wind turbine components. e.g blades, pitch and pitching method, rotor, yaw system, tower, drive train and so on. Few the more, it include a external circumstance. e.g wind speed, wind direction, air density. these basic parameters be used for the control of wind turbine by wind turbine controller in wind turbine simulator. The wind turbine controller can be designed in the wind turbine simulator. But a developer must make the real control system that will be made using PLC or PC or other processor. The developer must verify the function of control system. that is control algorithm , I/O function, communication, sequence and so on. This verification is possible if we substitute the real wind turbine control system for wind turbine controller in the simulator.

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Emulation of Variable Wind Speed and Turbulance Effect in a Wind Turbine Simulator (가변 풍속과 터뷸런스를 고려한 가변속 풍력 발전 시스템 시뮬레이터 개발)

  • Song, Seung-Ho;Kim, Dong-Yong;Kim, In-Sun;Kyong, Nam-Ho
    • 한국신재생에너지학회:학술대회논문집
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    • 2006.11a
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    • pp.290-296
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    • 2006
  • Control algorithms and implementation issues for a wind turbine simulator are presented for realistic emulation of variable wind characteristics using a lab-scale motor and generator set. When the average wind speed nd turbulence level is given, the torque reference of prime mover is decided through various blocks, such as random wind speed generator, blade characteristic curves, and tower effect compensation. The variable nature of wind can be implemented and tested by not only the computer simulation but also the hardware-in-loop-simulator (HILS). Some application examples of HILS include the development and test of turbine control software for more efficient and stable operation. Feasibility of the proposed simulator has verified by computer simulations and experiment.

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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.

Experimental Assessment with Wind Turbine Emulator of Variable-Speed Wind Power Generation System using Boost Chopper Circuit of Permanent Magnet Synchronous Generator

  • Tammaruckwattana, Sirichai;Ohyama, Kazuhiro;Yue, Chenxin
    • Journal of Power Electronics
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    • v.15 no.1
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    • pp.246-255
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    • 2015
  • This paper presents experimental results and its assessment of a variable-speed wind power generation system (VSWPGS) using permanent magnet synchronous generator (PMSG) and boost chopper circuit (BCC). Experimental results are obtained by a test bench with a wind turbine emulator (WTE). WTE reproduces the behaviors of a windmill by using servo motor drives. The mechanical torque references to drive the servo motor are calculated from the windmill wing profile, wind velocity, and windmill rotational speed. VSWPGS using PMSG and BCC has three speed control modes for the level of wind velocity to control the rotational speed of the wind turbine. The control mode for low wind velocity regulates an armature current of generator with BCC. The control mode for middle wind velocity regulates a DC link voltage with a vector-controlled inverter. The control mode for high wind velocity regulates a pitch angle of the wind turbine with a pitch angle control system. The hybrid of three control modes extends the variable-speed range. BCC simplifies the maintenance of VSWPGS while improving reliability. In addition, VSWPGS using PMSG and BCC saves cost compared with VSWPGS using a PWM converter.

Super-Twisting Sliding Mode Control Design for Cascaded Control System of PMSG Wind Turbine

  • Phan, Dinh Hieu;Huang, ShouDao
    • Journal of Power Electronics
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    • v.15 no.5
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    • pp.1358-1366
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    • 2015
  • This study focuses on an advanced second-order sliding mode control strategy for a variable speed wind turbine based on a permanent magnet synchronous generator to maximize wind power extraction while simultaneously reducing the mechanical stress effect. The control design based on a modified version of the super-twisting algorithm with variable gains can be applied to the cascaded system scheme comprising the current control loop and speed control loop. The proposed control inheriting the well-known robustness of the sliding technique successfully deals with the problems of essential nonlinearity of wind turbine systems, the effects of disturbance regarding variation on the parameters, and the random nature of wind speed. In addition, the advantages of the adaptive gains and the smoothness of the control action strongly reduce the chatter signals of wind turbine systems. Finally, with comparison with the traditional super-twisting algorithm, the performance of the system is verified through simulation results under wind speed turbulence and parameter variations.