• Title, Summary, Keyword: Wind Turbine

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Ride-through of PMSG Wind Power System Under the Distorted and Unbalanced Grid Voltage Dips

  • Sim, Jun-Bo;Kim, Ki-Cheol;Son, Rak-Won;Oh, Joong-Ki
    • Journal of Electrical Engineering and Technology
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    • v.7 no.6
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    • pp.898-904
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    • 2012
  • This paper presents a ride-through skill of PMSG wind turbine system under the distorted and unbalanced grid voltage dips. When voltage dips occur in the grid, pitch control and generator speed control as well as a parallel resistor of DC-link help to keep the turbine's safety. Modern grid code requires a wind turbine to supply reactive currents to help voltage recovery after grid faults clearance. In order to supply reactive currents to the grid in case of the distortedly unbalanced grid voltage dips, a special PLL is needed to control the grid side converter and to regulate the grid voltages symmetrically. The proposed method is applied to 2MW multi-pole PMSG wind turbine system, and verified by simulation.

A Comparative Performance Test for Turbine in Wind Tunnel and Towing Tank (풍동과 예인 수조를 이용한 터빈 성능 비교 시험)

  • Kang, Jung-Min;Lee, Yeong-Ho;Lee, Kyu-Chan
    • New & Renewable Energy
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    • v.7 no.4
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    • pp.42-49
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    • 2011
  • The objective of this paper is to suggest a new method of a wind turbine performance test. The performance test of a wind turbine is generally carried out in a wind tunnel. The test needs not only a high-accuracy measuring system but also durable structure to withstand high speed turbine rotation and wind flow. Therefore, we tried turbine performance test using a towing tank to improve stability and reliability. Because a turbine rotates more slowly and generates more torque in the water than in the wind tunnel under similarity conditions. In this study, we developed turbine performance test systems and verified the turbine test method using a towing tank through comparing results of the wind tunnel and the towing tank test.

Profile Design of Loop-Type Blade for Small Wind Turbine

  • Kim, Youngwon;Park, Jeanho;Lee, Nak-Kyu;Yoon, Jonghun
    • International Journal of Precision Engineering and Manufacturing-Green Technology
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    • v.4 no.4
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    • pp.387-392
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    • 2017
  • The importance of renewable energy-based wind turbine for generating electricity has been significantly issued due to their advantages in environment-friendly, low noise, good appearance and infinite energy source characteristics. Unfortunately, the turbine with a loop-type blade has not been widely researched on the optimal design and performance test. This paper has targeted to propose the optimal profile of loop-type blade for 3kW wind turbine based on basic design formulas in terms of tip speed ratio (TSR), twist angle and chord length for loop-type blade, which was produced with 3D printing. Finally, by virtue of the wind tunnel tests, simplified Model A-2 is selected as the optimal blade model in terms of performance and efficiency in energy harvesting for the wind turbine.

Wind Turbine Simulator for Comparative Study of MPPT Controls

  • Putri, Adinda Ihsani;Ahn, Minho;Choi, Jaeho
    • Proceedings of the KIPE Conference
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    • pp.128-129
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    • 2012
  • This paper proposed the wind turbine simulator for comparative study of the MPPT controls. The development of this wind turbine simulator is based on the torque controlled induction motor. The torque reference is obtained from a mathematical model of wind turbine whereas the inputs are rotor speed, wind speed and fixed-value of pitch angle. By using this wind turbine simulator, the real wind is not needed. Wind speed information can be stored and regenerated anytime. Hence it is possible to apply the same wind speed condition to different MPPT controls. With the same wind speed condition, it can fairly compare the advantages and disadvantages of the MPPT controls. The proposed wind turbine simulator is verified through PSIM simulation.

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Simulation for Pitch Angle Control Strategies of a Grid-Connected Wind Turbine System on MATLAB/Simulink

  • Ro, Kyoung-Soo;Choi, Joon-Ho
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.21 no.1
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    • pp.91-97
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    • 2007
  • This paper presents a pitch angle controller of a grid-connected wind turbine system for extracting maximum power from wind and implements a modeling and simulation of the wind turbine system on MATLAB/Simulink. It discusses the maximum power control algorithm for the wind turbine and presents, in a graphical form, the relationship of wind turbine output, rotor speed, and power coefficient with wind speed when the wind turbine is operated under the maximum power control algorithm. The objective of pitch angle control is to extract maximum power from wind and is achieved by regulating the blade pitch angle during above-rated wind speeds in order to bypass excessive energy in the wind. Case studies demonstrate that the pitch angle control is carried out to achieve maximum power extraction during above-rated wind speeds and effectiveness of the proposed controller would be satisfactory.

Analysis of the effect of blade positions on the aerodynamic performances of wind turbine tower-blade system in halt states

  • Ke, Shitang;Yu, Wei;Wang, Tongguang;Ge, Yaojun;Tamura, Yukio
    • Wind and Structures
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    • v.24 no.3
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    • pp.205-221
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    • 2017
  • The unsteady flow field disturbance between the blades and tower is one of the primary factors affecting the aerodynamic performance of wind turbine. Based on the research object of a 3MW horizontal axis wind turbine which was developed independently by Nanjing University of Aeronautics and Astronautics, numerical simulation on the aerodynamic performance of wind turbine system in halt state with blades in different position was conducted using large eddy simulation (LES) method. Based on the 3D unsteady numerical simulation results in a total of eight conditions (determined by the relative position with the tower during the complete rotation process of the blade), the characteristics of wind pressure distributions of the wind turbine system and action mechanism of surrounding flow field were analysed. The effect of different position of blades on the aerodynamic performance of wind turbine in halt state as well as the disturbance effect was evaluated. Results of the study showed that the halt position of blades had significant effect on the wind pressure distribution of the wind turbine system as well as the characteristics of flow around. Relevant conclusions from this study provided reference for the wind-resistant design of large scale wind turbine system in different halt states.

Performance Comparison of Two Wind Turbine Generator Systems Having Two Types of Control Methods

  • Saito, Sumio;Sekizuka, Satoshi
    • International Journal of Fluid Machinery and Systems
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    • v.2 no.1
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    • pp.92-101
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    • 2009
  • The purpose of this paper is to gain a greater understanding of the performance of practical wind turbine generating systems with differing output power controllers and controlling means for wind turbine speed. Subjected wind turbines, both equipped with an asynchronous power generator, are located at two sites and are defined as wind turbine A and wind turbine B in this study, respectively. Their performance differences are examined by measuring wind speed and electric parameters. The study suggests that both wind turbines have a clear linkage between current and output power fluctuations. Comparison of the fluctuations to wind speed fluctuation, although they are triggered primarily by wind speed fluctuation, clearly indicates the specific behaviors inherent to the respective turbine control mechanisms.

Stability Analysis of a Wind Turbine Blade Considering Wind Force and Variation of Pitch Angle (풍 하중과 Pitch각 변화에 따른 풍력 터빈 블레이드의 안정성 해석)

  • Kwon, Seung Min;Kang, Moon Jeong;Yoo, Hong Hee
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.22 no.12
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    • pp.1164-1171
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    • 2012
  • Recently, researches related to the green energy generation systems have increased significantly. Among them wind turbines are the most spread practical green energy generation systems. In order to enhance the power generation capacity of the wind turbine blade, the length of wind turbine blade has increased. It might cause undesirable excessive dynamic loads. Therefore dynamic characteristics of a wind turbine blade system should be identified for a safe design of the system. In this study, the equations of motion of a wind turbine blade system undergoing gravitational force are derived considering wind force and pitch angle. Effects of wind speed, variation of pitch angle of the wind turbine blade, rotating speed, and the blade length on its stability characteristics are investigated.

The wind tunnel measuring methods for wind turbine rotor blades

  • Vardar, Ali;Eker, Bulent
    • Wind and Structures
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    • v.7 no.5
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    • pp.305-316
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    • 2004
  • In this study, a wind tunnel, that has been developed for experiments of wind turbine rotor blades, has been considered. The deviations of the measurements have been examined after this wind tunnel had been introduced and the measurements on it had been explained. Two different wind turbine rotor blades miniatures have been used for getting better results from the experiments. The accuracy of measurements have been experimented three times repetitively and examined statistically. As a result, wind speed values which this type of wind tunnel and wind turbine rotors need for starting, wind speed in the tunnel, temperature and moisture values, the number of rotor's revolution, and the voltage that is produced in 102 ${\Omega}$ resistance and current values have been determined to be fixed by measurements used. This type of wind tunnel and wind turbine rotor' performance difference and the difference of revolution figures have been determined to be fixed by measurements used.

Numerical Analysis of Wind Turbine Scale Effect by Using Computational Fluid Dynamics (전산유체역학을 이용한 풍력터빈 축소효과 수치해석)

  • Park, Young-Min;Chang, Byeong-Hee
    • 한국신재생에너지학회:학술대회논문집
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    • pp.269-272
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    • 2006
  • Numerical analysis of wind turbine scale effect was performed by using computational fluid dynamics. For the numerical analysis of wind turbine. Three dimensional Navier-Stokes solver with various turbulence models was tested and realizable k-e turbulence model was selected for the simulation of wind turbines. To validate the present method, performance of NREL (National Renewable Energy Laboratory) Phase VI wind turbine model was analyzed and compared with experiment and blind test data. Using the present method, numerical simulations for various size of wind tunnel model were carried out and characteristics were observed in detail. The power loss due to the interference between wind turbine and nacelle was also computed for relatively larger nacelle installation in wind tunnel test. The present results showed good correlations with experimental data and reasonable trends of scale effect of wind turbine.

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