• Title/Summary/Keyword: The renewable energy

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Assessment of Optimal Constitution Rate of Windturbine and Photovoltaic Sources for Stable Operation of Microgird (마이크로그리드의 안정적 운영을 위한 풍력 및 태양광 발전원 최적 구성 비율 산정 방안 연구)

  • Lee, Su-Mi;Chun, Yeong-Han
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.2
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    • pp.272-276
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    • 2010
  • Renewable energy sources are considered to be environment-friendly alternatives those are increasingly introduced in the power systems. Microgrid is one of the systems in which renewable sources have a main role as a energy suppliers. Decision of constitution rates of renewable energy sources is very important for the economical and stable operation of microgird systems. In this paper, we present a method to assess an optimal constitution rate of renewable sources especially of windturbine and photovoltaic systems.

Development of Prediction Model for Renewable Energy Environmental Variables Based on Kriging Techniques (크리깅 기법 기반 재생에너지 환경변수 예측 모형 개발)

  • Choy, Youngdo;Baek, Jahyun;Jeon, Dong-Hoon;Park, Sang-Ho;Choi, Soonho;Kim, Yeojin;Hur, Jin
    • KEPCO Journal on Electric Power and Energy
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    • v.5 no.3
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    • pp.223-228
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    • 2019
  • In order to integrate large amounts of variable generation resources such as wind and solar reliably into power grids, accurate renewable energy forecasting is necessary. Since renewable energy generation output is heavily influenced by environmental variables, accurate forecasting of power generation requires meteorological data at the point where the plant is located. Therefore, a spatial approach is required to predict the meteorological variables at the interesting points. In this paper, we propose the meteorological variable prediction model for enhancing renewable generation output forecasting model. The proposed model is implemented by three geostatistical techniques: Ordinary kriging, Universal kriging and Co-kriging.

Thermal Behavior of Air Conditioning System in an Indoor Energy Storage System (실내 에너지저장시스템 공조시스템의 열적 거동에 관한 연구)

  • Kim, Junyoung;Choi, Naksam;Kim, Jintaek
    • New & Renewable Energy
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    • v.17 no.1
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    • pp.33-39
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    • 2021
  • The energy use is increasing as the quality of human life improves. and research on the efficient use of energy in ESS (Energy Storage System) is ongoing. An air conditioner is required for the efficient use of an ESS, as are data on the distribution of the temperature of the latter based on the capacity of the air conditioner. In the absence of an air conditioner, the battery of the ESS reaches its maximum temperature of 40℃ after 2 h. When an air conditioner is present, the temperature of the battery stabilizes as the capacity of the former increases.

Design of Horizontal Axis Tidal Current Power Turbine with Wake Analysis (수평축 조류발전 터빈 설계 및 후류 특성 분석)

  • Jo, Chul-Hee;Kim, Do-Youb;Lee, Kang-Hee;Rho, Yu-Ho;Kim, Kook-Hyun
    • New & Renewable Energy
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    • v.7 no.3
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    • pp.92-100
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    • 2011
  • With the increased demand of clean energy and global warming measures, the renewable energy development has been increased recently. The TCP (Tidal Current Power) is one of the ocean renewable energy sources. Having the high tidal energy source in Korea, there are many potential TCP sites with strong current speed. The rotor, which initially converts the energy, is a very important component because it affects the efficiency of the entire system. The rotor performance is determined by various design parameters including number of blades, shape, sectional size, diameters and etc. However, the interactions between devices also contribute significantly to the energy production. The rotor performance considering the interaction needs to be investigated to predict the exact power in the farm. This paper introduces the optimum design of TCP turbine and the performance of devices considering the interference between rotors.

An Economic Evaluation about Research and Development for Renewable energy in Korea (대체에러지 기술개발에 대한 수익성 평가분석)

  • 전영서;김진오
    • Journal of Korea Technology Innovation Society
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    • v.7 no.2
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    • pp.325-349
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    • 2004
  • This paper tried to evaluate an economic analysis about research and development far areas of renewable resource in Korea. To evaluate this validity, we tried to calculate the spillover effect of R&D investment through input-output table. In the first stage of spillover effect, we simply calculate the rate of return on R&D investment for renewable energy resources in Korea through the input-output model, which can calculate the value added as well as output based upon the price of 2000 year. According to the first stage calculation, the rate of return on R&B investment in solar heat is higher than any other renewable energy. In the second stage we tried to calculate the second round of spill over effect, which derives from the additional amount of supply of renewable resources due to the R&D investment. The overall evaluation of R&D invesment including the first stage as well as second stage spillover effect shows that bio-energy and waste energy generate 14 times as well as 2.5 times in the rate of return respectively.

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Influence of Device Parameters Spread on Current Distribution of Paralleled Silicon Carbide MOSFETs

  • Ke, Junji;Zhao, Zhibin;Sun, Peng;Huang, Huazhen;Abuogo, James;Cui, Xiang
    • Journal of Power Electronics
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    • v.19 no.4
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    • pp.1054-1067
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    • 2019
  • This paper systematically investigates the influence of device parameters spread on the current distribution of paralleled silicon carbide (SiC) MOSFETs. First, a variation coefficient is introduced and used as the evaluating norm for the parameters spread. Then a sample of 30 SiC MOSFET devices from the same batch of a well-known company is selected and tested under the same conditions as those on datasheet. It is found that there is big difference among parameters spread. Furthermore, comprehensive theoretical and simulation analyses are carried out to study the sensitivity of the current imbalance to variations of the device parameters. Based on the concept of the control variable method, the influence of each device parameter on the steady-state and transient current distributions of paralleled SiC MOSFETs are verified separately by experiments. Finally, some screening suggestions of devices or chips before parallel-connection are provided in terms of different applications and different driver configurations.

A study on the introduction plan of the renewable energy in innovation city (혁신도시 신재생에너지 도입 연구)

  • Kim, Jeong-Uk;Kim, Ho-Chan;Boo, Chang-Jin
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.12 no.5
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    • pp.2254-2260
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    • 2011
  • This paper presents the introduction plan of the renewable energy in innovation city. The introduction plan to make the condition of innovation city best should consider the economical efficiency, the quality of life and the sustainable development. The design of balanced city is demanded to build environment friendly and sustainable city. Energy efficient buildings should be designed to deal with the energy efficiency and environment problem. Therefore, in this paper, we analyze the energy efficiency and provide the method to introduce the renewable energy system, in various buildings. As a result, the renewable energy plans of each innovation city are suggested and analyzed.

The Utilization System of the Resource Map for Renewable Energy (재생에너지 자원지도 활용시스템)

  • Yun, Chang-Yeol;Kim, Kwang-Deuk;Kang, Yong-Heack
    • 한국태양에너지학회:학술대회논문집
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    • 2008.11a
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    • pp.306-309
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    • 2008
  • Renewable energy information becomes one of the greatest issues, but it is difficult for a general user to manage and utilize new renewable energy information. Therefore we develop the utilization system of the resource map which aimed to provide the information for space analysis and vertification of the validity for development of each part of solar, wind, smallhydro, biomass, geothermal. But this system is needed to gather more supporting data and make resonable index to make various decisions.

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A Case Study on the Application of Renewable Energy System for Urban Regeneration (도시재생을 위한 신재생에너지 적용성에 관한 사례연구)

  • Kim, Seong-Eun;Chung, Min-Hee;Park, Jin-Chul;Rhee, Eon-Ku
    • 한국태양에너지학회:학술대회논문집
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    • 2008.04a
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    • pp.294-299
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    • 2008
  • The enforcement of the Kyoto Protocol to reduce greenhouse gas is definitely a challenge we cannot avoid. Korea ranks 10th in the world and 1st among OECD countries in terms of the volume of greenhouse gas emission and is expected to join Annex I countries which have to reduce emission after 2012. For the sustainable development, we shouldn't depend upon fossil fuel energy longer. This study will provide preliminary data to developing renewable energy systems for urban generation. There are investigated a recent case study of CONCERTO projects co-funded by the European Commission and analyzed application of renewable energy systems as a urban energy source.

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The Basic Study on the Ripple Effect of Industrial & Technological Policy for New & Renewable Energy (신재생에너지 산업 기술 정책의 투자효과 분석에 대한 기초 연구)

  • Kim, Jeongbae
    • Journal of the Korean Solar Energy Society
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    • v.32 no.5
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    • pp.18-24
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    • 2012
  • This study is to propose the quantitative methods instead of total results on New & Renewable energy R&D investments. To do that, this study used KETEP R&D investment profile, National R&D investment profile, and ISTANS industrial census results. From the analysis, this study firstly showed that the R&D investment on New&Renewable energy is higher than that of other industrial parts. And the investment increase ratio on New&Renewable energy is also very higher during past 10 years. And finally showed that the ripple effects(relatively the employee number, the amount of sales, and the amount of export) of the focus energy group including feul cell, photovoltaic, and wind power was higher than those of general manufacturing industry. This approach was firstly conducted using the poor census results, so other analysis methods will be developed and performed to exact;y show the investment ripple effect.