• Title/Summary/Keyword: Dual rotor

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Performance Analysis and Pitch Control of Dual-Rotor Wind Turbine Generator System (Dual-Rotor 풍력 발전 시스템 성능 해석 및 피치 제어에 관한 연구)

  • Cho, Yun-Mo;No, Tae-Soo;Jung, Sung-Nam;Kim, Ji-Yon
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.33 no.7
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    • pp.40-50
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    • 2005
  • In this paper, preliminary results for performance prediction of a dual-rotor wind turbine generator system are presented. Blade element and momentum theories are used to model the aerodynamic forces and moments acting on the rotor blades, and multi-body dynamics approach is used to integrate the major components to represent the overall system. Not only the steady-state performance but the transient response characteristics are analyzed. Pitch control strategy to control the rotor speed and the generator output is proposed and its performance is verified through the nonlinear simulation.

Development of 1MW Dual-rotor Wind Turbine System (1MW급 Dual-rotor 풍력발전 시스템 개발)

  • Kim, Sung-Ju
    • Proceedings of the KIPE Conference
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    • 2007.11a
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    • pp.196-198
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    • 2007
  • 1MW급 듀얼로터(Dual rotor) 풍력발전 시스템을 충남 서천군 서면 마량리 서천화력발전소 회사장 부지에 지난 2007년 5월 설치를 완료하였다. 듀얼로터 풍력발전 시스템은 기존의 싱글(Single) 로터 시스템과 달리 바람의 이용율의 극대화를 위해 2개의 로터 시스템으로 구성되어 있으며, 실시간으로 변하는 바람의 방향에 로터의 방향이 향하도록 프리요(Free yaw)를 실현하였다. 본 연구에서는 1MW급 듀얼로터 풍력발전 시스템의 특징과 구성에 관한 전반적인 사항에 대해 소개하였다.

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Rotordynamic Characteristics of an APU Gas Turbine Rotor-Bearing System Having a Tie Shaft

  • Lee, An-Sung;Lee, Young-Seob
    • Journal of Mechanical Science and Technology
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    • v.15 no.2
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    • pp.152-159
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    • 2001
  • In this paper it is intended to set-up a sound model of the 60,000rpm 100kW prototype APU gas turbine rotor-bearing system, and particularly to investigate the influences of the tie shaft on the rotordynamic characteristics of the entire APU gas turbine rotor-bearing system, employing the dual shaft model. Firstly, a mock-up APU rotor has been constructed to test and verify the model. Analytical natural frequency results have agreed with the corresponding modal test ones to within 5% difference. Then, the rotordynamic characteristics of the prototype APU rotorbearing system have been investigated. Natural vibration and unbalance response analyses results have shown that the inner tie shaft resonance can cause high enough vibration of the outer main rotor shaft. This could be a concern as the rotor journals operate on very thin air film at high speed. It is concluded as a conservative design practice that the inner tie shaft should be explicitly modeled in the rotordynamic analysis of the APU rotor-bearing system.

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Dual-rotor Wind Turbine Generator System Modeling and Simulation (이중 로터 풍력발전 시스템 모델링 및 시뮬레이션에 관한 연구)

  • Cho, Yun-Mo;No, Tae-Soo;Min, Byoung-Mun;Lee, Hyun-Hwa
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.32 no.6
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    • pp.87-95
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    • 2004
  • In this paper, an efficient method for modeling a dual-rotor type wind turbine generator system and simulation results are presented. The wind turbine is treated as a collection of several rigid bodies, each of which represents, respectively, main and auxiliary rotor blades, high/low speed shafts, generator, and gear system. Simulation software WINSIM is developed to implement the proposed modeling method and is used to investigate the transient and steady-state performance of the wind turbine system.

Dual Rotor Wind Turbine System (수직/수평축 통합형 풍력발전 시스템)

  • Shinn, Chan;Kim, Ji-Ern;Song, Seung-Ho;Rho, Do-Hwan;Kim, Dong-Yong;Jung, Sung-Nam
    • Proceedings of the KIEE Conference
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    • 2001.10a
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    • pp.289-292
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    • 2001
  • A Dual rotor turbines HAWT/VAWT combined wind turbine system that can drastically enhance the power production capability compared to conventional Single Rotor Turbine HAWT system. The combined system that takes advantage of strong point of both horizontal and vertical Axis wind turbine system developed by a venture firm : KOWINTEC of Chonbuk National University. The HAWT/VAWT hybrid system has been successfully field tested and commercial operation since Feb. 12, 2001 in Hae-chang rest park, Bu-an county near the Sae Man-Kum Sea Dike. This paper will briefly describe the field test results performance and a special aerodynamic structure with bevel-planetary gear box of Dual Rotor Wind Turbine system.

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An Optimal Current Distribution Method of Dual-Rotor BLDC Machines

  • Kim, Sung-Jung;Park, Je-Wook;Im, Won-Sang;Jung, Hyun-Woo;Kim, Jang-Mok
    • Journal of Power Electronics
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    • v.13 no.2
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    • pp.250-255
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    • 2013
  • This paper proposes an optimal current distribution method of dual-rotor brushless DC machines (DR-BLDCMs) which have inner and outer surface-mounted permanent-magnet rotors. The DR-BLDCM has high power density and high torque density compare to the conventional single rotor BLDCM. To drive the DR-BLDCM, dual 3-phase PWM inverters are required to excite the currents of a dual stator of the DR-BLDCM and an optimal current distribution algorithm is also needed to enhance the system efficiency. In this paper, the copper loss and the switching loss of a DR-BLDCM drive system are analyzed according to the motor parameters and the switching frequency. Moreover, the optimal current distribution method is proposed to minimize the total electrical loss. The validity of the proposed method was verified through several experiments.

A Study on the Development of a 10KW Class Dual Rotor Counter-Rotating Wind Turbine Generator System with Low Wind Speed/High Efficiency and Its Field Test (저풍속/고효율 10KW급 상호역회전 풍력발전시스템 개발 및 실증실험에 관한 연구)

  • Heo, Hyun-Kang;Jange, Tae-Jong;Kim, Sang-Uk
    • 한국신재생에너지학회:학술대회논문집
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    • 2009.06a
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    • pp.495-499
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    • 2009
  • 본 논문에서는 상호역회전 풍력발전기와 New Yaw System 실증시험에 대하여 제시한다. 상호역회전 풍력발전기는 공기의 유동을 가진 운동에너지의 공기역학적(aerodynamic) 특성을 이용하여 동일한 바람방향에 대해 상호 반대방향으로 회전하는 Front Blade와 Rear Blade를, Generator의 Rotor와 Stator에 각각 결합 형성한 것으로, Generator와 Dual Blade의 회전력이 원심력이 아닌 구심력으로 변환되어 무게중심이 균형을 이루게 한다. 이렇게 변환된 구심력은 회전구동부분의 편마모 현상, 소음발생 현상 및 불균형 톨크 발생 현상 감소효과가 공히 구현되도록 하여 풍력발전기의 구조적 안정성 및 발전효율 증대효과를 얻을 수 있도록 한 기술이다.

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Performance Analysis of the Viscous-driven Micropump with Tandem Rotating Cylinders (한 쌍의 실린더를 가지는 점성구동 마이크로 펌프의 성능 해석)

  • Choi, Hyung-Il;Cho, Sung-Chan;Maeng, Joo-Sung
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.27 no.9
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    • pp.1256-1261
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    • 2003
  • Since the viscous effect increases as the size of device decreases, viscous-driven micropump is a promising mechanism in microscale applications. In the present study, a dual-rotor type pump which contains two counter-rotating cylinders for improving performance characteristics is proposed. First, for flows in the single-rotor type pump, the present unstructured grid simulation method is validated by comparing its results to the previous results. Next, the performance of the dual-rotor type pump is evaluated by the parametric studies and is compared to that of the previous single-rotor type pump. The flow characteristics are qualitatively similar to those of single-rotor type pump. However, the performance of the micropump with tandem rotors is still better than that of previous pumping type, e.g. much larger flow rate, smaller driving region, higher efficiency, and wider operation range.

Coupled Unbalance Response Analyses of a Geared Two-shaft Rotor-bearing System (기어 전동 2축 로터-베어링 시스템의 연성 불균형 응답해석)

  • 이안성;하진웅
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.13 no.8
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    • pp.598-604
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    • 2003
  • In this paper a general solution method is presented to obtain the unbalance response orbit from the finite element based equations of motion of a gear-coupled two-shaft rotor-bearing system, whose shafts rotate at their different speeds from each other. Particularly, are proposed analytical solutions of the maximum and minimum radii of the orbit. The method has been applied to analyze the unbalance response of a 800 refrigeration-ton turbo-chiller rotor-bearing system having a bull-pinion speed increasing gear. Bumps in the unbalance response of the driven high speed compressor rotor system have been observed at the first torsional natural frequency due to the coupling effect of lateral and torsional dynamics. Further, the proposed analytical solutions have agreed well with those obtained by a full numerical approach. The proposed analytical solutions can be generally applied to obtain the maximum and minimum radii of the unbalance response orbits of dual-shaft rotor-bearing systems coupled by bearings as well.