• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2011년도 춘계학술대회 초록집
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• pp.109.1-109.1
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• 2011

KEPCO was operating power plants with diesel generators in 49 islands including Baekryeong-Do, and the generation capacity was about 66 MW in 2008. The cost of fuel is increasing by the international oil price inflation and continuous rise of oil price is predicted. For the stabilizing of electric power supply to the separate islands, renewable energy and fuel cell systems were considered. Hydrogen is made using renewable energy such as wind power and solar energy, and then a fuel cell system generates electricity with the stored hydrogen. Though the system efficiency is low, it is treated as the only way to secure the stable electric supply using renewable energy at this present. The analytic hierarchy process was used to select suitable candidate island for the system installation and 5 islands including Ulleung-Do were selected. Economic evaluation for the system composed of a kerosene generator, a wind power, an electrolysis, and a fuel cell system was conducted with levelized generation cost based on present value methode. As the result, the necessity of renewable energy combined generation system and micro grid composition in the candidated islands was confirmed. Henceforth, the development of an integration technology which connects micro grid to the total power grid will be needed.

• Journal of Korea Trade
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• 제23권6호
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• pp.131-144
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• 2019

Purpose - The purpose of this study was to investigate market power of soybeans exported by the United States to Korea. Particularly, this paper considered dichotomous characteristics of genetically modified (GM) soybeans and non-GM soybeans and conducted empirical analysis of these two segregated soybean markets to understand key tenets of market power in international soybean trade. Design/methodology - The difference in market power between GM and non-GM soybeans was analyzed using Residual Demand Elasticity (RDE) and Residual Supply Elasticity (RSE) models over the period of 2008~2018. RDE and RSE models under an imperfect competition condition were used to estimate market margins and determine whether GM and non-GM exporters or importers exercised market power in the destination market. Findings - Empirical results suggested that the U.S. had a market power on both GM and non-GM soybean exports. GM exports had greater market power than non-GM exports (14% vs. 9%). By contrast, Korea showed an inability to grab market margin or exert market power in soybean imports. Both export supply by the U.S. and import demand by Korea were found to be more responsive to price changes of GM soybeans than to prices changes of non-GM soybeans. This might be due to a self-interested, profit-seeking strategy by the exporter and many concerned consumers regarding potential adverse effects of GMOs in the importing country. Originality/value - This paper fills the literature gap by exploiting market power in both GM and non-GM markets with explicit consideration of price correlations between GM and non-GM soybeans in Korea. A number of existing studies have provided evidence for market power broadly embedded in international commodity trade. However, studies focusing on Korean markets are limited. No study has explored the country's soybean trade. Furthermore, the majority of prior studies have almost exclusively focused on the market power from a standpoint of exporting countries without discussing importers' market structure. This paper also sought to understand potentially distinguished patterns of market power between GM and non-GM markets.

• 플랜트 저널
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• 제14권1호
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• pp.47-51
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• 2018

본 연구에서는 석탄화력발전의 출력 감소가 계통한계가격과 온실가스감축량에 어떻게 영향을 미치는지 분석하였다. 분석방법은 국영 발전회사에서 이용하는 전력거래예측프로그램을 이용하였으며 전력계통의 운영조건은 제7차 전력수급기본계획의 전력수요와 전원구성을 근거로 하였다. 분석결과 전체 석탄화력발전의 최대출력을 29 [%]까지 감소한 경우 계통한계가격은 감소전과 비교하여 12 [%p] 상승하고 온실가스 배출량은 9,966 [kton] 감축되었다. 또한 석탄화력발전기 전체 용량의 30 [%]에 해당하는 저효율 석탄화력발전기 16기를 정지한 경우 계통한계가격은 14 [%p] 까지 증가하였고 온실가스 배출량은 12,574[kton]까지 감축 가능함을 알 수 있었다.

• 전기학회논문지
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• 제64권5호
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• pp.667-679
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• 2015

The bearer of the power sector's ETS compliance cost is power consumer for the following reasons. Firstly, power companies are constrained in establishing appropriate strategies to comply with ETS regulations due to the structural differences between the domestic power market and emission trading system. In other words, because power companies do not have a right to determine price and production of electricity, they have to compete with other companies under disadvantaged conditions in the emission trading market. Secondly, because ETS compliance cost is part of power production costs as it is also clearly written in the national greenhouse gas reduction road-map and the second energy supply plan, the cost should be included in power price following the power market operation rule. Thirdly, the most effective method to reduce carbon emissions in power sector is to reduce power demand, which is efficiently achieved through raising power price to a realistic level. Low power price in Korea is the major cause of rising power demand which is also the major cause of rising GHG emission. Therefore, power sector's ETS compliance cost should be included in power price to encourage power consumers' actions on reducing power consumption. Fourthly, when externality cost occurs in the process of delivering public services, usually beneficiary pay principle is applied to identify the cost bearer. Since electricity is one representative public good, the bearer of power sector's ETS compliance cost is power consumer.

• Current Photovoltaic Research
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• 제11권4호
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• pp.134-143
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• 2023

Efforts are being made to respond to global warming. Interest in and demand for the private sector-led RE100 campaign is also increasing. Self-built solar power generation, one of the implementation tools for RE100, is not expanding. However, it can be an economical means of implementation in the long run. In this study, we intend to analyze the impact on the optimal ratio of self-solar power generation using HOMER simulation. OPR defines the optimal solar power generation ratio and looks into what changes there are in the optimal solar power ratio when self-power consumption increases and external power purchase price changes. As a result, the optimal rate of self-solar power generation has a low impact even if self-power consumption increases. As the external power unit price increases, the optimal ratio increases, and at a power unit price of 100 KRW/kWh, OPR is 24%; at 200 KRW/kWh OPR is 31%; and at 300 KRW/kWh OPR is 34%. This shows that the electricity price replaced during the life cycle has a high impact on the economic feasibility of solar power generation. However, when the external power unit price reached a certain level, the increase in OPR decreased. This shows that it is difficult for domestic companies to achieve RE100 based on the economic feasibility of solar energy alone. Therefore, efforts are needed to supply renewable energy in the public sector.

• 지적과 국토정보
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• 제52권2호
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• pp.189-210
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• 2022

세계 주요 도시는 자동차로 인한 교통 정체, 에너지 과소비, 환경오염 등을 해결하는 대안으로 대중교통을 주목하고 있다. 아울러 대중교통에 대한 쉬운 접근성이 그 이용을 높인다는 점에서 여러 연구는 대중교통에 대한 접근성을 개선하는 것이 중요함을 강조하였다. 이러한 대중교통은 부동산 가치 평가와 투자 결정에도 중요한 변수로 작용한다. 이 연구는 대중교통 접근성에 대한 기존 접근방법을 비판적으로 검토한 후 수요-공급 기반 접근성 기법으로 서울시 지하철역에 대한 접근성을 측정한다. 그 다음 그 영향을 용도별, 분위별 토지가격을 통해 분석하였다. 다층헤도닉모형으로 분석한 결과, 첫째, 지하철에 대한 수요와 공급을 모두 고려한 접근성은 주거용과 비주거용 토지가격에 모두 긍정적 영향을 주었다. 영향은 비주거용보다 주거용에 보다 강하게 나타났다. 둘째, 총 세 개의 함수로 측정한 접근성 가운데 Exponential 함수에 의한 접근성은 주거용 토지가격에 가장 적합했으며, 비주거용 토지가격에는 Power 함수로 측정한 접근성이 가장 설명력이 높았다. 셋째, 토지 가격 분위별 영향을 보면, 주거용과 비주거용 토지가격 모두 가장 비싼 분위에 가장 큰 영향을 준 것으로 나타났다. 아울러 분위별 가격에서도 모형적합도 측면에서 주거용은 Exponential 함수로 측정한 접근성, 비주거용은 Power 함수로 측정한 접근성이 상대적으로 적합한 것으로 나타났다. 이러한 연구 결과는 공공투자가 인근지역에 미치는 영향을 이해할 뿐만 아니라 부동산 가치평가, 대중교통 서비스로 인한 우발이익의 회수 방안 모색, 대중교통 투자로 인한 주거비 상승 대책 마련에 활용할 수 있을 것이다.

• 조명전기설비학회논문지
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• 제25권11호
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• pp.39-49
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• 2011

Smart Grid has two main objectives on both supply and demand aspects which are to distribute the renewable energy sources on supply side and to develop realtime price responses on demand side. Renewable energy does not consume fossil fuels, therefore it improves the eco-friendliness and saves the cost of power system operation at the same time. Demand response increases the flexibility of the power system by mitigating the fluctuation from renewable energies, and reduces the capacity investment cost by shedding the peak load to off-peak periods. Currently Smart Grid technologies mainly focus on energy monitoring and display services but it has been proved that enabling technologies can induce the higher demand responses through many pilot projects in USA. On this context, this paper provides a price responsive algorithm for HEMS (home energy management system) on the real time pricing environment. This paper identifies the demand response as a core function of HEMS and classifies the demand into 3 categories of fixed, transferable, and realtime responsive loads which are coordinated and operated for the utility maximization or cost minimization with the optimal usage combination of three kinds of demand.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2007년도 춘계학술대회 논문집
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• pp.38-41
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• 2007

The increase of $CO_2$ emission by increasing of fossil fuel usage has been understood a major cause of global warming. The supply of electric energy is heavily dependent on the massive thermal power and nuclear power plant before developing the renewable energy to supply the electric energy stably at a low price. The large and sound forged components of pressure vessel, turbine and generator are widely used in power plant such as wind power, hydroelectric power generation, nuclear power and thermal power plant. This paper is discussed the trend of manufacturing technology for pressure vessel and turbine to satisfy the required condition of utility company. It is also introduced a strategy of forging industry to cope with carbon tax.

• Journal of the Korean Data and Information Science Society
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• 제20권2호
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• pp.283-292
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• 2009

최근 전반적인 산업의 급진적인 발전으로 인해 전력사용량도 급속도로 증가하고 있다. 그래서 (주)한국전력에서도 기본요금의 12개월 연동제를 실시하여 전기요금을 피크전력 중심으로 대폭 인상하여 전력사용 수용가의 최대 수요전력을 억제하는 요금정책을 시행하는 등 꾸준히 증가하고 있는 전력수요에 효율적인 대응전략을 수립하고 있다. 본 연구에서는 이러한 전략중의 하나인 DR프로그램을 효율적으로 운영하기 위해서 필수적으로 사용되는 CBL방법을 실제 전력 사용량의 분석을 통해 비교분석하고, 이를 바탕으로 효율적인 DR프로그램의 운영방안을 제시 하고자 한다.

• 한국인터넷방송통신학회논문지
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• 제19권6호
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• pp.191-196
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• 2019

도시철도 시설물의 경우, 대중교통의 특성상 전력공급이 차단되면 혼란이 발생하므로 통신설비, 방재설비 및 승차장 안전문 등이 안전한 승객의 이동을 위해 전원공급이 유지되어야 한다. 또한, 도시철도 운행노선에는 다수의 전동차가 운행 중이므로 운행 간격과 시설복구 시간을 고려하면 승차장 안전문은 최소 30분 이상, 통신설비 및 방재설비는 1시간 이상의 설비가동이 요구된다. 따라서 도시철도 구간의 역사나 차량화재발생 시 화재로 인한 추가확산을 막기 위해 주요전력이 차단되므로 유도등 및 배연설비의 안정적 동작 유지를 위해 비상 전원공급이 필수적이다. 최근에는 비상시 정전을 방지하는 UPS (uninterruptible power supply, 무정전 전원공급장치) 기능과 가격이 저렴한 야간 시간대에 전기를 저장하였다가 주간 피크시간대에 사용할 수 있도록 하여 전기요금을 절감해주는 ESS 기능을 합친 비상발전용 UPS 기능을 갖춘 복합형 전력저장시스템을 개발하는 추세이다.