• Title/Summary/Keyword: Small wind turbine system

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A Mathematical Modeling on Battery Charging Circuit for the Power Storage of Wind Power Generation (풍력발전의 전력저장을 위한 베터리 충전회로에 관한 수학적인 모델링)

  • Ko, Seok-Cheol;Lee, Jae;Lim, Sung-Hun;Kang, Hyeong-Gon;Han, Byoung-Sung
    • Proceedings of the KIEE Conference
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    • 2001.10a
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    • pp.301-304
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    • 2001
  • Wind power generation system is one of the most useful energy resource using natural environment. One of the biggest problem we encountered is toot the wind speed is fluctuating sharply according to the weather conditions rather than it is stable. In this paper we do the equivalent modeling the mechanical energy of wind power turbine according to wind speed into the synchronous generator. We analyse the equivalent modeling output part of rectifier into DC/DC converter input part theoretically. We analyse a battery charging characteristics for power storage enabling the supply of stable power to the load. We design a system and do the modeling of it analytically so that it supplies a stable power to the load by constructing a DC-AC inverter point. Also we make a small size model usable in actual wind power generation system of 30kw and make an experiment and confirm its validity.

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Experimental Study on the Flow Characteristics of Supersonic Turbine with the Axial Gap Ratios (초음속 터빈의 축방향 간격비에 따른 유동 특성에 대한 실험적 연구)

  • Cho, Jong-Jae;Kim, Kui-Soon;Jeong, Eun-Hwan
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.35 no.2
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    • pp.136-142
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    • 2007
  • A small supersonic wind tunnel was designed and built to study the flow characteristics of a supersonic impulse turbine cascade. The supersonic cascade with a 2-dimensional supersonic nozzle was tested for the axial gap ratio (${\delta}$) of the supersonic turbine that is the one of the turbine design parameter. Firstly, the flow was visualized by a single pass Schlieren system. Next, total and static pressure of the cascade were measured by a pressure scanning system. Highly complicated flow patterns including shocks, nozzle-cascade interaction and shock boundary layer interactions, flow characteristics of the supersonic turbine were observed.

Autonomous Micro-grid Design for Supplying Electricity in Carbon-Free Island

  • Hwang, Woo-Hyun;Kim, Sang-Kyu;Lee, Jung-Ho;Chae, Woo-Kyu;Lee, Je-Ho;Lee, Hyun-Jun;Kim, Jae-Eon
    • Journal of Electrical Engineering and Technology
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    • v.9 no.3
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    • pp.1112-1118
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    • 2014
  • In island and backcountry areas, electrical power is usually supplied by diesel generators. It is difficult for small scale diesel generators to have an economy of scale owing to the usage of fossil fuels to produce electricity. Also, there is a problem of carbon dioxide emissions that brings some environmental pollution to the entire region of the area. For solving those, this paper proposes a design method of autonomous micro-grid to minimize the fossil fuels of diesel generator, which is composed of diesel generator, wind turbine, battery energy storage system and photovoltaic generation system. The proposed method was verified through computer simulation and micro-grid operation system.

Full Scale Structural Testing of Small Wind Turbine Composite Blade (풍력발전용 소형복합재 블레이드의 실규모 구조시험)

  • Kim, Hong-Kwan;Kim, Tae-Seong;Lee, Jang-Ho;Moon, Byung-Young;Kang, Ki-Weon
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.35 no.11
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    • pp.1407-1413
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    • 2011
  • In this paper, the structural design for composite blade was performed and full scale structural test was conducted to verify the structural design and integrity of composite blade. Firstly, FE analysis was performed using commercial software ABAQUS under conditions of rated wind speed and Case H in IEC 61400-2. Lay-up sequence and ply thickness were designed based on FE results. And to verify the structural design, full scale structural test was conducted according to IEC 61400-2 under identical loading conditions of FE analysis. Finally, the force-deflection and local strain behavior of composite blade were evaluated.

Study on Rotating Speed of Kite Wind Turbine System and Design of PM Generator (연 풍력시스템의 회전속도 측정 및 발전기 시스템에 적용 가능한 영구자석 발전기 설계에 관한 연구)

  • Shin, Yujeong;Kim, Soo-Hyun;Kim, Jin Ho
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.15 no.4
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    • pp.141-147
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    • 2016
  • A direct PM generator has the effect of reducing the mechanical noise and ease of maintenance by eliminating a number of power transmission components. In addition, wind turbines operating at low speed with the advantages of high output, high efficiency, and small size. The generator was designed as a small direct-drive PM generator that can be applied to a kite even at low wind speeds. The RPM (Revolutions Per Minute) of the reel was measured in two ways using a cadence/speedometer sensor and a tachometer while the actual kite. The RPM derived from the experiment was applied to the simulation on the designed generator. The no-load characteristic analysis for the magnetic fields produced for the permanent magnet generator by a permanent magnet and stator winding currents is achieved using a 2D coordinate system. A commercial electromagnetic analysis program, ANSYS Maxwell, was used to model the electromagnetic dynamics.

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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Operational Strategy for a BESS-based Microgrid (BESS 기반 마이크로그리드 운영전략)

  • Lee, Ha-Lim;Chun, Yeong-Han
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.64 no.12
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    • pp.1666-1672
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    • 2015
  • Small islands are quite adequate places where microgrid system with renewable sources can replace diesel engines as operation costs of diesel engine in most small islands are very high. To get the large amount of renewable energy, the microgrid system has very large capacity of renewable sources. The system with large capacity of renewable sources can meet the case when supplied energy is greater than the load and the fluctuation of source output is very large. The battery energy storage system can be a solution to stabilize the system with large capacity of renewable sources. In this case, BESS can be utilized as a master source for the synchronous operation of all sources including diesel engine, wind turbine and PV. The diesel generators can be used as a backup in case the BESS SOC goes below a certain level. In this paper, we suggest a novel unit commitment of diesel generators and operation schedule of pump for water supply service with the information of wind forecast, PV forecast, and load forecast. The proposed methods has been implemented and tested at the test bed in Gasa-Island.

An experimental study on the flow characteristics of a supersonic turbine cascade as the leading edge shape and the nozzle-cascade gap (초음속 터빈 익렬 앞전 형상 및 노즐-익렬 간격에 따른 유동 특성에 대한 실험적 연구)

  • Cho Jong-Jae;Kim Kui-Soon;Kim Jin-Han;Jeong Eun-Hwan
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • v.y2005m4
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    • pp.349-354
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    • 2005
  • In this paper, a small supersonic wind tunnel is designed and built to study the flow characteristics of a supersonic impulse turbine cascade. The flow is visualized by means of a single pass Schlieren system. The supersonic cascade with 2-dimensional supersonic nozzle was tested for various blade leading edge shapes and gaps between the nozzle and cascade. Highly complicated flow patterns including shocks, nozzle-cascade interaction and shock boundary layer interactions are observed.

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An Experimental Study on the Flow Characteristics of a Supersonic Turbine Cascde as Nozzle Installation Angle (노즐 설치각에 따른 초음속 터빈 익렬의 유동 특성에 대한 실험적 연구)

  • Cho Jong-Jae;Jeong Soon-In;Kim Kui-Soon;Park Chang-Kyu
    • Journal of the Korean Society of Propulsion Engineers
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    • v.8 no.4
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    • pp.1-8
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    • 2004
  • In this paper, a small supersonic wind tunnel is designed and built to study the flow characteristics of a supersonic impulse turbine cascade. The flow is visualized by means of a sin91e pass Schlieren system. The supersonic cascade with 3-dimensional supersonic nozzle was tested over a wide range of nozzle installation angle. Highly complicated flow patterns including shocks, nozzle-cascade interaction and shock boundary layer interactions are observed.

An experimental study on the flow characteristics of a 2-D supersonic turbine with pressure ratio (압력비에 따른 2차원 초음속 터빈의 유동특성에 대한 실험적 연구)

  • Jeong Soo-In;Kim Kui-Soon;Kim Jin-Han;Lee Eun-Seok;Cho Jong-Jae
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2004.10a
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    • pp.99-108
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    • 2004
  • In this paper, a small supersonic wind tunnel is designed and built to study the flow characteristics of a supersonic impulse turbine. The flow is visualized by means of a single pass Schlieren system. The supersonic cascade with 2-dimensional supersonic nozzle was tested over a wide range of pressure ratio. Highly complicated flow patterns including shocks, nozzle-cascade interaction and shock boundary layer interactions are observed.

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