• Title/Summary/Keyword: solar generator

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A Study on Probabilistic Reliability Evaluation of Power System Considering Wind Turbine Generators (풍력발전기를 고려한 전력계통의 확률론적인 신뢰도 평가에 관한 연구)

  • Park, Jeong-Je;Wu, Liang;Choi, Jae-Seok;Moon, Seung-Il
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.57 no.9
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    • pp.1491-1499
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    • 2008
  • This paper presents a study on reliability evaluation of a power system considering wind turbine generators (WTG) with multi-state. Renewable energy resources such as wind, wave, solar, micro hydro, tidal and biomass etc. are becoming importance stage by stage because of considering effect of the environment. Wind energy is one of the most successful sources of renewable energy for the production of electrical energy. But, reliability evaluation of generating system with wind energy resources is a complex process. While the wind turbine generators can not modelled as two-state model as like as conventional generators, they should be modelled as multi-state model due to wind speed random variation. The methodology for obtaining reliability evaluation index of wind turbine generators is different from it of the conventional generators. A method for making outage capacity probability table of WTG for reliability is proposed in this paper. The detail process is presented using case study of simple system.

A Study on the Application of a Wind Power Generation System Using Outdoor Air on the Rooftop and Indoor Ventilation (건물 옥상외기와 실내배기를 활용한 풍력발전시스템 적용 연구)

  • Lee, Yong-Ho;Park, Jin-Chul;Hwang, Jung-Ha
    • Journal of the Korean Solar Energy Society
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    • v.34 no.1
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    • pp.72-80
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    • 2014
  • This study proposed a wind power generation system utilizing outdoor air on the rooftop and indoor ventilation, which would increase according to the building height, as a way to help to save energy consumption in a building by using wind power energy of the new renewable energy sources. The study measured the distribution of air currents and power generation according to the usage factor of exhaust pipes in the kitchen and bathroom and identified the elements to consider when applying a wind power generation system to buildings in order to use outdoor air on the rooftop increasing according to the height and the indoor ventilation produced in the facility vertical shafts inside the buildings by installing a wind power generation system on the rooftop. (1) The study measured the ventilation velocity of the kitchen hood and bathroom ventilation fan by changing the zone areas by the households according to the usage factor of [${\alpha}$]=33~100%. As a result, the kitchen ventilation pipe generated the ventilation wind of 3.0m/s or more at the usage factor of [${\alpha}$] 66% or higher, and the bathroom ventilation pipe generated ventilation velocity lower than 3.0m/s, the blade velocity of the wind power generator, even after the usage factor rose to [${\alpha}$]=100%. (2) As the old bathroom ventilation pipe generated the ventilation velocity of 3.0m/s, the blade velocity of the wind power generator, even with the rising usage factor [${\alpha}$], the application of an outdoor air induction module increased the ventilation velocity by 2.9m/s at the usage factor of [${\alpha}$]=33%, 3.8m/s at the usage factor of [${\alpha}$]=66%, and 3.6m/s at the usage factor of [${\alpha}$]=100%. Thus the ventilation velocity of 3.0m/s, the blade velocity of the wind power generator, or higher was secured. (3) The findings prove that the applicability of a wind power generation system using outdoor air on the rooftop and indoor ventilation is excellent, which raises a need for various efforts to increase the possibility of its commercialization such as securing its structural stability according to momentary gusts on the rooftop and typhoons in summer and making the structure light to react to the wind directions of outdoor air on the rooftop according to the seasons.

Analysis of Small Hydropower Resource Characteristics for Nakdong River System (낙동강수계의 소수력자원 특성 분석)

  • Park, Wan-Soon;Lee, Chul-Hyung
    • Journal of the Korean Solar Energy Society
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    • v.32 no.6
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    • pp.68-75
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    • 2012
  • Small hydropower is one of the many types of new and renewable energy, which is planning to develop, as the country is abundant in endowed resources. In order to fully utilize small hydropower resources, there is a need for greater precision in quantifying small hydropower resources and establish an environment in which energy sources can be discovered using the small hydropower resource management system. This study has given greater precision to calculate annual electricity generation and capacity of small hydropower plants of Nakdong river system by inquiring into average annual rainfall, basin area and runoff coefficient, which is anticipated to promote small hydropower resources utilization. Small hydropower resource management system was also established by additionally providing base information on quantified small hydropower resources and analysis function and small hydropower generator status, rivers, basin, rainfall gauging station, water level gauging station etc.. Small hydropower resource management system can be used gather basic information for positive applications of small hydropower energy nationwide.

Correlation Analysis of Wind and Solar Power Generation Pattern for Modeling of Renewable Energy (신재생에너지 모델링을 위한 풍력 및 태양광 발전 출력 패턴 상관관계 분석)

  • Kim, Min-Jeong;Park, Young-Sik;Park, Jong-Bae;Roh, Jae-Hyung
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.10
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    • pp.1823-1831
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    • 2011
  • When the RPS(Renewable Portfolio Standards) becomes effective in 2012, the use of renewable energy will be dramatically increased. However, there are no production simulations and demand supply programs that reflect the characteristics of the renewable energy. This paper analyzes correlations of the domestic wind power and solar power generation pattern in different areas and those of these sources' output and load pattern. Based on the regional correlation analysis, an appropriate method that uses a average output of the renewable energy or another modeling that takes account of uncertainty could be selected. Because it's output is dependent on weather condition, we can not control the generation of renewable energy, that is the reason why the correlation between the load and output pattern of sources can be helpful to determine whether the renewable energy is modeled as a generator or load modifier. Through this analysis, a basis will be provided in order to properly model the renewable energy source.

Control System Design of NREL 5MW Wind Turbine (NREL 5MW 풍력터빈의 제어시스템 설계)

  • Nam, Yoonsu;Im, Changhee
    • Journal of the Korean Solar Energy Society
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    • v.32 no.5
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    • pp.31-40
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    • 2012
  • This paper introduces a methodology for NREL 5MW wind turbine, which is the variable speed and variable pitch(VSVP) control system. This control strategy maximizes the power extraction capability from the wind in the low wind speed region and regulates the wind turbine power as the rated one for the high wind speed region. Also, pitch control efficiency is raised by using pitch scheduling.Torque schedule is made of torque table depending on the rotor speed. Torque control is used for vertical region in a torque-rotor speed chart. In addition to these, mechanical loads reduction using a drive train damper and exclusion zone on a torque schedule is tried. The NREL 5MW wind turbine control strategy is comprised by the generator torque and blade pitch control. Finally, proposed control system is verified through GH Bladed simulation.

Optimization of Stand-Alone Hybrid Power Systems Using HOMER Program (HOMER 프로그램을 이용한 독립형 하이브리드 발전시스템 최적화)

  • Yang, Su-Hyung;Boo, Chang-Jin;Kim, Ho-Chan
    • Journal of the Korean Solar Energy Society
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    • v.32 no.2
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    • pp.11-18
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    • 2012
  • Diesel fuel is expensive because transportation to remote areas adds extra cost, and it causes air pollution by engine exhaust. Providing a feasible economical and environmental solution to diesel generators is important. A hybrid system of renewable plants and diesel generators can benefit islands or other isolated communities and increase fuel savings. Renewable energy is, however, a natural source that produces a fluctuating power output. In this paper, hybrid power system of the marado lighthouse is proposed to supply stable power in the stand-alone hybrid power system. The proposed hybrid power system consists of the diesel generator, wind turbine, photovoltaic, fuel cell, and battery bank. To decrease the carbon emissions and find the optimization, the cost analysis of hybrid system is simulated using HOMER program and the optimized hybrid power system is designed.

Analysis on the Operational Characteristics of the Combined Generation System with Power Storage Apparatus that Apply Microcontroller

  • Lim, Jung-Yeol;Yoon, Seok-Am;Cha, In-Su
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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    • v.12B no.1
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    • pp.24-30
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    • 2002
  • The developments of the solar and the wind power energy are necessary since the future alternative, energies that have no pollution and no limitation are restricted. Currently power generation system of MW scale has been developed, but it still has a flew faults with the weather condition. In order to solve these existing problem combined generation system of photovoltaic(400W) and wind power generation system(400W) was suggested. It combines wind power and solar energy to have the supporting effect from each other. However, since even combined generation system cannot always generate stable output with ever-changing weather condition, power storage apparatus that uses elastic energy of spiral spring to combined generation system was also added far the present study. In an experiment, when output of combined generation system gets lower than 12V(charging voltage), power was continuously supplied to load through the inverter by charging energy obtained from generating rotary energy of spiral spring operates in small scale generator.

Realtime Monitoring system of Residential Photovoltaic system (태양광-풍력 복합발전시스템의 출력제어 특성에 관한 연구)

  • Lee J.I.;Suh J.S.;Yoon P.H.;Cha I.S.
    • Proceedings of the KIPE Conference
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    • 2003.07b
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    • pp.933-937
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    • 2003
  • The development of the solar and the wind power energy are necessary since the future alternative energies that have no pollution and no limitation are restricted. Currently power generation system of MW scale has been developed, but it still has a few faults with the weather condition. In order to solve these existing problems, combined generation system of photovoltaic(400w) and wind power generation system(400w) was suggested. It combines wind power and solar energy to have the supporting effect from each other However, since even combined generation system cannot always generate stable output with ever-changing weather condition, power compensation device that uses elastic energy of spiral spring to combined generation system was also added for the present study. In an experiment, when output of system gets lower than 12V(charging voltage), power was continuously supplied to load through the inverter by charging energy obtained from generating rotary energy of spiral spring operates in small scale generator

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A Study on the Discontinuous Energy Ceneration System for Power Compensation (불연속 에너지 발생장치의 에너지 보상 시스템에 대한 연구)

  • Lee, Jeong-Il;Lim, Jung-Yeol;Kang, Byung-Bog;Cha, In-Su
    • Proceedings of the KIEE Conference
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    • 2002.04a
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    • pp.133-138
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    • 2002
  • The developments of the solar and the wind power energy are necessary since the future alternative energies that have no pollution and no limitation are restricted. Currently power generation system of MW scale has been developed, but it still has a few faults with the weather condition. In order to solve these existing problems, combined generation system of photovoltaic(400W) and wind power generation system(400W) was suggested. It combines wind power and solar energy to have the supporting effect from each other. However, since even combined generation system cannot always generate stable output with ever-changing weather condition, power compensation device that uses elastic energy of spiral spring to combined generation system was also added for the present study. In an experiment, when output of system gets lower than 12V(charging voltage), power was continuously supplied to load through the inverter by charging energy obtained from generating rotary energy of spiral spring operates in small scale generator.

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Characteristics of Lightning Occurred over Jeju Island for 2004-2006 and an Effect of Lightning on Wind Turbine Generator System (2004-2006년에 발생한 제주지역의 낙뢰 특성 및 풍력발전기에 미치는 낙뢰의 영향)

  • Ko, Kyung-Nam;Kim, Kyoung-Bo;Huh, Jong-Chul
    • Journal of the Korean Solar Energy Society
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    • v.28 no.1
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    • pp.83-89
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    • 2008
  • This paper presents the characteristics of lightning pver Jeju island and a case of emergency stop of a wind turbine due to lightning. Using the IMPACT ESP sensor to detect lightning, the data on lightning frequency, lightning strength, regional lightning event were obtained and analyzed in detail. The measurement period was for 3 years from 2004 to 2006. As a result, lightning occulted the most frequently in July and August. As for lightning strength, lightning with grades -4 to -6 and +3 to +5 occur ed more frequently. The eastern part of Jeju island had much more lightning frequency compared with the western part of it. Lightning with high grade occurred mainly in offshore site and the coastal region. Furthermore, the data on wind turbine stop caused by lightning was analyzed. Although wind turbine lightning damage was not much in this study, the investigation on lightning damage or lightning faults to a wind turbine should be conducted in Korea to increase availability of wind turbine.