• 제목/요약/키워드: Measured power curve

검색결과 168건 처리시간 0.029초

측정 출력곡선과 기상자료를 이용한 소형 풍력발전기 연간 발전량 비교평가 (Measured AEP Evaluations of a Small Wind Turbine using Measured Power Curve & Wind Data)

  • 김석우
    • 한국태양에너지학회 논문집
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    • 제33권6호
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    • pp.32-38
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    • 2013
  • In an efforts to encourage renewable energy deployment, the government has initiated so called 1 million green homes program but the accumulated installation capacity of small wind turbine has been about 70kW. It can be explained in several ways such that current subsidy program does not meet public expectations, economic feasibility of wind energy is in doubt or acoustic emission is significant etc. The author investigated annual energy production of Skystream 3.7 wind turbine using measured power curve and wind resource data. The measured power curve of the small wind turbine was obtained through power performance tests at Wol-Ryoung test site. AEP(Annual Energy Production) and CF(Capacity Factor) were evaluated at selected locations with the measured power curve.

3MW 풍력발전시스템 출력성능평가에 관한 연구 (The Power Performance Testing for 3MW Wind turbine System)

  • 고석환;장문석;박종포;이윤섭
    • 한국태양에너지학회 논문집
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    • 제31권4호
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    • pp.19-26
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    • 2011
  • We are carried out power performance testing for 3MW wind turbine system at Je-ju wind turbine testing Site and analyzed measured data which was stored through monitoring system. In this paper, we described the power performance testing results and analyzed an uncertainty of measured data sets. The power curve with measured power data is closely coincide with designed power curve except for the low wind speed sections(4m/s~7m/s) and the annual energy production which is given Ray leigh distribution was included with 1.5~5.9% of uncertainty in the wind speed region as 4~11m/s. Although the deviation of curve between measured power and designed power is high, the difference of annual energy production is low in the low wind speed region.

6kW 풍력발전기의 출력곡선 측정 (Power Curve Measurements on the 6kW Wind Turbine)

  • 유능수;남윤수;이정완;조주석
    • 산업기술연구
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    • 제25권B호
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    • pp.149-157
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    • 2005
  • The power performance monitoring system for a small class of wind turbine is established. The wind turbine power performance characteristics are determined by measured power curve and the estimated annual energy production (AEP). The measured power curve is determined by collecting simultaneous measurements of wind speed and power output at the test site under varying wind conditions. In order to determine the power performance characteristics of the wind turbine accurately, the data are of sufficient quantity and quality shall be corrected according to defined criteria. In this study, the 6kW wind turbine made by Germany Inventus GmbH is examined.

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풍력발전기 출력성능 평가에 대한 연구 (The Study about Performance Test of Wind turbine)

  • 고석환;장문석
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2011년도 제42회 하계학술대회
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    • pp.1348-1349
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    • 2011
  • In this paper, The case of power performance test for 3MW wind-turbine system is introduced. For the verification of power curve and the certification of wind-turbine, power performance test is very important. This paper described the power testing results of a 3MW wind turbine and analysed an uncertainty about the testing. The measured power curves are very closely coincide with the calculated. Total uncertainty of measured data for Power Curve is 120~200kW in the rated power.

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풍력발전기 너셀에 장착된 풍속계를 이용한 출력성능 평가 (Evaluation of Power Performance by Anemometer on WTGS)

  • 김수상;박세광
    • 센서학회지
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    • 제21권4호
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    • pp.303-310
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    • 2012
  • We carried out the power performance evaluation for 1.5 MW${\times}$2 by using anemometer installed on WTGS(Wind Turbine Generator System) in the wind farm at Shi-hwa bang-a-mu-ri. In this paper, we compared and analyzed the performance of guaranteed output and measured output of WTGS which includes output curve, output coefficient, AEP(Annual Energy Product) and availability, etc.. The power performance of WTGS was optimized in the low wind speed sections(3 m/s ~ 10 m/s) and the measured output was more produced by AEP 109 % and availability 112 % than the guaranteed output. In addition, we could also cut the high cost of testing WTGS performance by using anemometer as a substitute for weather mast.

원자로 압력용기강 및 Al 합금재의 J-R곡선평가시 Load Ratio 해석의 유효성 검토 (Validity Examination on Evaluation of J-R Curve in the Nuclear Reactor Pressure Vessel Steels and Aluminum Alloys by Load Ratio Analysis)

  • 윤한기;우대호;김연겸;차귀준
    • 동력기계공학회지
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    • 제1권1호
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    • pp.80-90
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    • 1997
  • The purpose of this study is to evaluate the validity examination of the J-R curve characteristics for the nuclear reactor pressure vessel steels and Al alloys by the load ratio analysis. The results of the load ratio analysis are compared with those of the J-R curve which are obtained by the ASTM unloading compliance method. The crack length calculated by the load ratio analysis is agree well with the measured final crack length. The slope of the exponential J-R curve estimated by the load ratio analysis is slightly smaller than that by the ASTM unloading compliance method. The J-R curve obtained by the ASTM unloading compliance method is over-predicted and should be offsetted due to the initial negative crack. On the other hand, the load ratio analysis method can evaluate the J-R curve by only load-displacement curve without particular crack measurement equipment.

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새로운 태양전지 모델의 파라미터 추출법 (A Novel Parameter Extraction Method for the Solar Cell Model)

  • 김욱;김상현;이종학;최우진
    • 전력전자학회논문지
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    • 제14권5호
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    • pp.372-378
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    • 2009
  • 태양광 발전시스템의 설치 용량이 증가함에 따라 시스템 효율을 개선하기 위한 연구가 활발히 진행되고 있다. 고성능 시스템의 설계 및 시험을 위해서는 태양전지의 모델링을 바탕으로 태양전지의 물리적 특성에 관해 정확히 이해하는 것이 중요하다. 그러나 태양전지의 모델은 다수의 파라미터가 얽힌 비선형 형태이며, 모델식의 파라미터 값을 얻기 위한 기존의 방식에서는 오차를 동반하는 실제와 다른 가정을 전제로 하므로 결과적으로 추출된 파라미터의 정확도가 저하되게 되는 단점이 있다. 따라서 본 논문에서는 제조사가 표준상태에서 측정하여 공개하는 태양전지의 I-V 커브로부터 다이오드의 이상계수와 역포화 전류를 구하고 이로부터 저항 성분이 없는 이상적인 태양전지의 I-V 커브를 도출한 뒤, 실측된 I-V 커브와 차이를 최소화하는 직·병렬 저항값을 추출하는 새로운 방식을 제안한다. 기존의 방식과 제안된 방식의 모델링을 통하여 얻은 파라미터를 이용해 구현한 I-V 커브와 실측 I-V 커브와의 상관관계를 최소자승법을 통해 계산함으로써 제안된 방법의 유용함을 증명하였다.

나셀 변환 함수를 이용한 풍력터빈 출력성능평가 (Wind Turbine Power Performance Testing using Nacelle Transfer Function)

  • 김현우;고경남;허종철
    • 한국태양에너지학회 논문집
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    • 제33권4호
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    • pp.51-58
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    • 2013
  • A study on power performance testing of a wind turbine which has no met-mast at a distance of 2~4 rotor diameter was carried out using the Nacelle Transfer Function, NTF, according to IEC 61400-12-2. The wind data for this study was measured at HanKyoung wind farm of Jeju Island. The NTF was modeled using the correlation between wind speeds from the met-mast and from the wind turbine nacelle within 2~4 rotor diameter from the met-mast. The NTF was verified by the comparison of estimated Annual Energy Productions, AEPs, and binned power curves. The Nacelle Power Curve, NPC, was derived from the nacelle wind speed data corrected by NTF. The NPC of wind turbine under test and the power curve offered by the turbine manufacturer were compared to check whether the wind turbine is properly generating electricity. Overall the NPC was in good agreement with the manufacturer's power curve. The result showed power performance testing for a wind turbine which has no met-mast at a distance of 2~4 rotor diameter was successfully carried out in compliance with IEC 61400-12-2.

Double Cantilever Beam 방법을 이용한 다결정 알루미나의 Bridging 응력효과 해석 III. 다결정 알루미나의 Bridging 응력분포 (Analysis of bridging Stress Effect of Polycrystlline Aluminas Using Double Cantilever Beam Method)

  • 손기선;이성학;백성기
    • 한국세라믹학회지
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    • 제33권5호
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    • pp.602-615
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    • 1996
  • The purpose of the present study is to investigate the microstructural effect on the R-curve behavior in three aluminas with different grain size distributions by analyzing the bridging stress distribution. The crack opening displacement (COD) according to the distance behind the stationary crack tip was measured using an in situ SEM fracture method. The measured COD values in the fine-grained alumina agreed well with Wiederhorn's sollution while they deviated from Wiederhorn's solution in the two coarse-grained aluminas because of the increase of the crack closure due to the grain interface bridging in the crack wake. A numerical fitting procedure was conducted by the introduction of the power-law relation and the current theoretical model together with the measured COD's in order to obtain the bridging stress distribution. The results indicated that the bridging stress function and the R-curve computed by the current model were consistent with those computed by the power-law relation providing a reliable evidence for the bridging stress analysis of the current model. The strain-softening exponent in the power-law relation n, was calculated to be in the range from 2 to 3 and was closely related to the grain size distribution. Thus it was concluded from the current theoretical model that the grain size distribution affected greatly the bridging stress distribution thereby resulting in the quantitative analysis of microfracture of polycrystalline aluminas through correlating the local-fracture-cont-rolling microstructure.

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풍력터빈 성능 검증을 위한 출력측정 유효영역 선정 (Selection of Available Sector to Measure Power Generation for Validation of Wind Turbine Performance)

  • 오기용;정훈;이준신
    • 한국신재생에너지학회:학술대회논문집
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    • 한국신재생에너지학회 2009년도 춘계학술대회 논문집
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    • pp.525-528
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    • 2009
  • Power generation of wind turbine which is installed in wind farm should be measured to predict economic feasibility of wind farm. Also electric power company want to verify wind turbine performance which is stated by manufacturer. The International Electrotechnical Commission(IEC) published 61400-12-1 "Power performance measurements of electricity producing wind turbines" for test of wind turbine power performance. In this paper, measurable sector of wind speed is analysed based on IEC 61400-12-1 to verify power curve of wind turbine with various wind turbine in wind farm.

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