• KDI Journal of Economic Policy
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• 제41권4호
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• pp.67-99
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• 2019

This paper, focusing on the renewable portfolio standard (RPS), evaluates alternative renewable energy policies. We propose a tractable equilibrium model which provides a structural representation of Korea's electricity market, including its energy settlement system and renewable energy certificate (REC) transactions. Arbitrage conditions are used to define the core value of REC prices to identify relevant competitive equilibrium conditions. The model considers R&D investments and learning effects that may affect the development of renewable energy technologies. The model is parameterized to represent the baseline scenario under the currently scheduled RPS reinforcement for a 20% share of renewable generation, and then simulated for alternative scenarios. The result shows that the reinforcement of the RPS leads to higher welfare compared to weakening it as well as repealing it, though there remains room to enhance welfare. It turns out that subsidies are welfare-inferior to the RPS due to financial burdens and that reducing nuclear power generation from the baseline yields lower welfare by worsening environmental externalities.

• 한국태양에너지학회:학술대회논문집
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• 한국태양에너지학회 2012년도 춘계학술발표대회 논문집
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• pp.445-450
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• 2012

BIPV/T (Building Intergrated PhotoVoltaic/Thermal) is combined system produces electricity and thermal energy. The heat from PV modules should be removed for better electrical performance, and can be converted into useful thermal energy. The efficiency of the PV system's performance will raise by the system removes heat from the PV. The test system is installed to top floor of the experimental house in the KEPCO Research Institute. The planned experiment is following. (1) Supplying heat energy to top floor. (2) Supplying heat and cool energy to thermal storage in the bottom of the top floor. (3) Supplying heat energy to EHP for improved performance. The experimental performance is executed from 13th February to 13th March, 2012. The solar generation of electricity is 4.04kWh under the horizontal solar radiation is $1000W/m^2$ and the air temperature is $25^{\circ}C$.

• 환경위생공학
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• 제10권3호
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• pp.131-138
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• 1995

As the energy consumption increases continuously, the emission amount of air pollutants is growing, and after all it can influence the global environment as welt as the regional atmosphere. So, the clean energy which emits less air pollutants should be developed and widely used to reduce emission of pollutants. Electricity, known for clean energy in the side of consumption, is not actually clean in the process of generation. Electric power is generated using fossil fuels which produce acidic gases like $SO_{2}$, $NO_{x}$, etc. The emission rates of $SO_{2}$, $NO_{x}$, $CO_{2}$ are 2g,0.78g and 1 l0g per electric power generating Ikwh. If one light(60 watt bulb) be turned off at each house for a month electricity will be saved about 1.Skillion kwh a year. This is almost the same as 4,170 tons of $SO_{2}$ and $NO_{x}$. As a result the economization of electricity will be one of the effective strategy to reduce the air pollution and to keep our life clean and comfortable.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 하계학술대회 논문집 A
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• pp.386-388
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• 2002

The key objectives of this study are to develop the enhanced electricity system analysis methodologies and decision making process applicable to the analysis of the energy policies, especially the renewable energy policy, through surveying the recent trend and relevant study results. This study utilizes DECADES model, a comparative assessment tool developed by IAEA, and suggests a way to establish DECADES database required to make it applicable to Korean electricity system analysis. For this, a survey on the existing database of various organizations is performed. A case study on the economic and environmental impact of renewable energy is made using DECADES model.

• 신재생에너지
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• 제10권4호
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• pp.22-28
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• 2014

The thermoelectric generator using solar heat was applied to the device (heat-electricity conversion device) to produce small-scale electricity. The purpose of this study was to investigate the characteristics and performance of the device, which equipped with heat pipe as heat source. The experimental results showed that efficiency of circular single evacuated solar collector was higher 2.7 times than that of rectangular solar collector. Furthermore maximum power of 5 watt was obtained when 2 devices with series array were used and it could be more improved by increasing the number of device or measurement time.

• 전기학회논문지
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• 제64권7호
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• pp.1125-1129
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• 2015

Increasing peak load is one of the major concerns about operation of urban railroad systems. Since ESSs (Energy Storage Systems) have a great potential for shaving the peak load, there has been a growing interest in the use of ESS for peak load reduction. Also, ESS can be optimally scheduled to minimize the electricity purchasing cost under a given ToU (Time-of-Use) tariff by taking advantage of electricity price difference between peak and off-peak time. This paper presents a Mixed Integer Programming (MIP)-based ESS scheduling method to minimize the electricity purchasing cost under a ToU tariff for an urban railroad system.

• 식품보건융합연구
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• 제5권4호
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• pp.19-23
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• 2019

In recent years, the Internet was a lot of information on the use of Tesla coils bifilar [1] in conjunction with induction cooker, for "free" electricity during power resistive load, including different incandescent lamps. With the development of scientific and technological progress, the demand for electricity in each year is increasing, and at the same time, the need to increase the capacity of electricity production, which entails large investments and, consequently, increase of prices for consumers. As before today, the search for free electric energy is an up-to-date and still open topic. The purpose of research - simplification of information on the possibility of using bifilar coils as an electric current source in conjunction with induction cooker. Consequently, it can be concluded from the above that the use of Tesla coils in combination with induction cooker has very low k.k.d. and it is not possible to obtain excessive electric energy using the Tesla coil under the connection schemes considered.

• International Journal of Computer Science & Network Security
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• 제22권5호
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• pp.1-4
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• 2022

The growth in global population and industrialization has led to an increasing demand for electricity. Accordingly, the electricity providers need to increase the electricity generation. Due to the economical and environmental concerns associated with the generation of electricity from fossil fuels. Alternative power recourses that can potentially mitigate the economical and environmental are of interest. Renewable energy resources are promising recourses that can participate in producing power. Among renewable power resources, solar energy is an abundant resource and is currently a field of research interest. Photovoltaic solar power is a promising renewable energy resource. The power output of PV systems is mainly affected by the solar irradiation and ambient temperature. this paper investigates the utilization of machine learning unsupervised neural network techniques that potentially improves the reliability of PV solar power systems during integration into the electrical grid.

• 한국물환경학회지
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• 제38권5호
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• pp.240-246
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• 2022

Water and energy are inextricably linked and referred to as 'Water-Energy Nexus'. Recently, this topic has been drawing a lot of attention from various studies due to the exacerbated water availability. Korea's water and energy consumption has been increasing consistently, which calls for better management. This paper aims to identify changes in electricity consumption in relation to water intake and purification processes. Using Log Mean Divisia Index (LMDI) Decomposition Analysis method, this study attributes the changes to major factors such as; Total population (population effect), household/population (structure effect), GDP/household (economic effect), and water-related energy use/GDP (unit effect). The population effect, structure effect, and economic effect contributed to an increase in water-related electricity consumption, while the unit effect contributed to a decrease. As of 2019, the economic effect increased the water supply sector's electricity consumption by 534 GWh, the population effect increased by 73 GWh, and the structure effect increased by 243 GWh. In contrast, the unit effect decreased the electricity consumption by -461 GWh. We would like to make the following suggestions based on the findings of this study; first, the unit effect must be improved by increasing the energy efficiency of water intake and purification plants and installing renewable energy power generation facilities. Second, the structure effect is expected to increase over time, and to mitigate it, water consumption must be reduced through water conservation policies and the improvement of water facilities. Finally, the findings of this study are expected to be used as foundational data for integrated water and energy management.

• 한국지리정보학회지
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• 제16권4호
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• pp.91-105
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• 2013

본 연구에서는 강원권 및 동남권에 해당하는 동해와 남해일부 해역을 대상으로 파력발전 시스템을 도입함으로서 기대할 수 있는 잠재성을 평가하였다. 연구지역 해역에 750kW급 파력발전기 28대를 설치하는 것을 가정하고, 미국 국립해양대기청(NOAA)의 NWW3(Noaa Wave Watch III) 모델로부터 구축된 평균 유의파고 및 첨두파주기 자료와 스텐포드 대학과 미네소타 대학이 공동 개발한 InVEST 소프트웨어를 이용하여 연간 전력 생산량과 경제적 효과를 분석하였다. 분석 결과 연구지역에서의 발전 전력량은 최대 1,207MWh/year, 최소 163MWh/year로 산정되었으며, 연안보다는 육지로부터 먼 해역으로 갈수록 발전 전력량이 점차 증가하는 공간적 분포 패턴을 보였다. 파력발전 시스템의 운영기간을 25년으로 가정하고 시스템 도입을 위해 투입되는 비용과 생산되는 전력의 판매 수익을 함께 고려하여 순현재가치(NPV)를 산정하였다. 그 결과 파력발전 시스템으로부터 생산된 전력을 해저 케이블과 강원권과 동남권 지역의 해안가에 위치한 10개의 발전소들의 설비를 이용하여 내륙으로 공급할 경우에는 NPV가 최대 5,882달러(약 6,600천원), 최소 -63,494달러(약 -71,000천원)인 것으로 분석되었다. 반면, 파력발전 시스템으로부터 생산된 전력을 울릉도와 독도의 전력망으로 공급할 경우, 해저 케이블 설치를 위해 투입되는 초기 비용이 크게 줄어들어 울릉도, 독도 인근 해역에서 NPV 값이 최대 28,095달러(약 31,600천원)까지 증가하는 것을 확인할 수 있었다. 또한, 전력 판매단가가 증가할수록 동해상의 NPV의 손익분기선이 육지 쪽으로 가까워지는 것으로 분석되었으며, 울릉도, 독도 인근 해역에서는 전력 판매단가가 현재 수준보다 100원 상승할 경우 NPV 값이 최대 88,158달러(약 99,000 천원)까지 증가하는 것으로 예측되었다.