• Title/Summary/Keyword: Generation Sector

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A Modified EGEAS Model with Avoided Cost and the Optimization of Generation Expansion Plan (회피비용을 고려한 EGEAS 모형 개발과 전원개발계획의 최적화)

  • 이재관;홍성의
    • Journal of the Korean Operations Research and Management Science Society
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    • v.17 no.1
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    • pp.117-117
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    • 1992
  • Pubilc utility industries including the electric utility industry are facing a new stream of privatization com-petition with the private sector and deregulation. The necewssity to solve now and in the future power supply and demand problems has been increasing through the sophisticated generation expansion plan(GEP) approach con-sidering not only KEPCo's supply-side resources but also outside resources such as non-utility generation(NUG) demand-side management (DSM). Under the environmental situation in the current electric utility industry a new approach is needed to acquire multiple resources competitively. This study presents the development of a modified electric generation expansion analysis system(EGEAS) model with avoided cost based on the existing EGEAS model which is a dynamic program to develope an optimal generation expansion plan for the electric utility. We are trying to find optimal GEP in Korea's case using our modified model and observe the difference for the level of reliabilities such as the reserve margin(RM) loss of load probability(LOLP) and expected unserved energy percent(EUEP) between the existing EGEAS model and our model. In addition we are trying to calculate avoided cost for NUG resources which is a criterion to evaluate herem and test possibility of connection calculation of avoided cost with GEP implementation using our modified model. The results of our case study are as follows. First we were able to find that the generation expansion plan and reliability measures were largely influenced by capacity size and loading status of NUG resources, Second we were able to find that avoided cost which are criteria to evaluate NUG resources could be calculated by using our modified EGEAS model with avoided cost. We also note that avoided costs were calculated by our model in connection with generation expansion plans.

A Study on Performance Analysis of New Renewable Energy Power Generation for Energy-Climate Change Policy Linkage: A Restricted Cost Approach (에너지-기후변화정책 연계를 위한 신재생발전의 성과분석: 제약비용함수접근법)

  • Lee, Myunghun
    • Environmental and Resource Economics Review
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    • v.27 no.2
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    • pp.339-362
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    • 2018
  • In this paper, we simulate the contribution of an increasing renewable energy to demands for fossil fuels and power supply price by estimating a cost function for the Korean electric power generation sector. Since the renewable energy is a composite input, it is not feasible to compute the price index for renewable energy due to data limit. We estimate a restricted cost function, which is derived by minimizing the costs of fossil fuels conditional on the quantity of renewable energy set to its optimal level, jointly with supply relation. In particular, derivation of the shadow price of renewable energy would make it possible to analyze potential costs incurred by power plants.

Abatement Potentials of Power Generation Technologies for the Achievement of National INDC (자발적 온실가스 감축목표 달성을 위한 발전기술별 온실가스저감 잠재량 평가)

  • Baek, Minho;Roh, Minyoung;Yurnaidi, Zulfikar;Kim, Suduk
    • Environmental and Resource Economics Review
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    • v.25 no.4
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    • pp.565-590
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    • 2016
  • In accordance with the global efforts to reduce greenhouse gas emissions, Korean government submitted its INDC (Intended Nationally Determined Contribution) of 25.7% for domestic reduction and the total of 37% reduction by 2030 including the purchase of emission reduction permit from abroad. In this study, 25.7% reduction target is being evaluated to see its impact on domestic energy system using the integrated assessment model, GCAM (Global Change Assessment Model). Results show that electricity generation from fossil fuel technologies using coal and gas decrease by 28.0%, 13.5% while that of biomass, wind power, solar energy increase by 47.6%, 22.0% and 45.4%, respectively. It is worth noting that so called new technology such as USC (ultra supercritical power generation) does not contribute to achieving the emission reduction target and careful and quantitative analysis is required for such categorization in the future.

A Case Study on Business Model Evaluation for Broadcasting Telecommunication Convergence Service (차세대 방통융합서비스 사업모델 평가에 관한 사례)

  • Lim, Gyoo Gun;Kang, Sangug;Seol, Joongho;Yu, Dengsheng
    • Journal of Information Technology Services
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    • v.16 no.1
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    • pp.83-98
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    • 2017
  • Broadcasting telecommunication convergence service means a service where broadcasting and telecommunication converge. Recently with the advancement of technology, broadcasting telecommunication convergence service has been evolving to provide multimedia contents through various devices including wired and wireless network environment. Up to now, IPTV and smartphone-based convergence services have been dominant, but more developed and evolved technology and media will appear in the future. In order to derive the next generation broadcasting telecommunication convergence service supporting model, this study derives an evaluation model of broadcasting telecommunication convergence service and presents a case of evaluation of 30 demonstration projects supported by the Korean government from 2010 to 2014. In this study, we derive an evaluation model and evaluate the demonstration projects by reflecting the position of the main stake holders of service such as users, experts, and related organizational institutions, away from the existing simple service evaluation method. Expert questionnaire used AHP (Analytic Hierarchy Process) method, and the evaluation results were divided into upper and lower groups to provide key implications by a gap analysis. From this analysis this study suggests guidelines for next generation broadcasting telecommunication service support projects. The next generation broadcasting convergence service business should be based on open platform type in terms of service type. In terms of service media, it should be centered on open devices such as smart phones and smart TVs. In terms of types of business responsibilities, it should be led by public organizations and it is necessary to increase the fund matching ratio by at least 62% when the private sector participates.

A Study on Battery Charging and Supply System of Electric Vehicle Using Photovoltaic Generation (태양광 발전을 이용한 전기자동차 배터리 충전 및 공급시스템에 관한 연구)

  • Choi, Hoi-Kyun
    • Journal of Climate Change Research
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    • v.8 no.3
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    • pp.265-273
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    • 2017
  • Recently the Paris Climate Change Accord has been officially put into effect, making global efforts to implement Greenhouse Gas (GHG) reductions, and also International environmental regulations in the automotive sector will be further strengthened. The electric vehicle, which minimizes the particulate matter generated by existing internal combustion engine automobiles, is evaluated as a representative eco-friendly automobile. However, charging the battery of an electric vehicle is not fully environment-friendly if it is fueled by electricity that is being generated by fossil fuels as an energy source. The energy generated by the photovoltaic power generation system, which is an infinite clean energy, can be used to charge an electric vehicle's battery. Currently, shortage of charging facilities, time of charging, and high battery prices are the problem of activating the supply of electric vehicles. This study is to build a conjunction between the EVBSS (Electric Vehicle Battery Supply System) and ESS (Energy Storage System), which can quickly supply the photovoltaic charged battery to the required demand. If the charged battery in the Battery Swapping Station (BSS) is swapped swiftly, it will dramatically shorten the waiting time for charging the battery. As a result, if the battery is rented when it is needed, electric vehicles can be sold without the cost of a battery, which accounts for a large portion of the total cost, then the supply of electric vehicles are expected to expand. Furthermore, it will be an important alternative to maneuver climate change by minimizing GHG emissions from internal combustion engine vehicles.

An Analysis of Consumer Preferences for Forecasting a Dominant Design of the Next Generation TV Display Technology: A Conjoint Analysis (TV용 차세대 디스플레이의 지배적 디자인 예측을 위한 소비자 선호속성 분석 : 컨조인트 분석의 활용)

  • Lee, Min Woo;Ji, Ilyong
    • The Journal of the Korea Contents Association
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    • v.19 no.6
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    • pp.663-675
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    • 2019
  • During the last decade, the dominant design of display has been LCD, and it has been led by Korean manufacturers. However, their leading positions has been recently threatened by Chinese manufacturers, Korean manufacturers are endeavoring to move toward next generation display technologies. They embarked on standards battle to win dominant design especially in the next generation display market for TVs by launching new technologies such as Quantum-dot display and OLED. While there are a number of factors of dominant design, it is expected that the technical attributes of the technology itself may be the most significant factor. For this reason, this research scrutinizes consumer preferences for technical attributes, and attempts to provide implications for standards battle in the display (for the TVs) sector. For this purpose, we employed a conjoint analysis for the preferences of potential consumers. The results show that potential consumers prefer displays with higher resolution, natural color, and durabillity.

An Experimental Study on the Ground Source Heat Pump System for Heating Economic Efficiency and Reduction Amount of $CO_2$ (지열 시스템의 난방 경제성 및 $CO_2$ 절감 실증 연구)

  • Nam, Leem-Woo;Paek, Gi-Dong
    • Journal of the Korean Society for Geothermal and Hydrothermal Energy
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    • v.3 no.2
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    • pp.25-30
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    • 2007
  • The final energy consumption in the building sector in Korea represents almost 20% of the total energy consumption. Besides, Space heating and hot water generation in Korea are based on fossil fuels, with a serious environmental impact. This study describes thermal performance of heating demonstration system using close-loop ground source heat pump installed at Korean minjok leadership academy. The results of the experimental study, it retrieve the investment cost for 3years 8months and reduction amount of $CO_2$are 293,900 $kgCO_2$.

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Secure One-Time Password Authentication in Mobile Environments (모바일 환경에서 안전한 일회용 패스워드 인증)

  • Kim, Dong-Ryool
    • Journal of Digital Convergence
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    • v.11 no.12
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    • pp.423-430
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    • 2013
  • With the active Internet e-commerce and the financial sector, mutual authentication between users and service providers has become very important. Because ID- and password-based authentication is of low security, one-time password authentication methods are widely used. The existing one-time password authentication scheme of S/Key authentication method is fraught with a number of issues in addition to plain text transmission, and the method of Kim Gong-ki et al. does not offer suggestions for session key generation and distribution method. Proposed in this paper is a protocol that solves these problems.

ON THE RELATIONSHIP BETWEEN SUBSTORM CURRENT SYSTEM AND BURSTY BULK FLOWS AT NEAR TAIL (서브스톰 전류계와 BBF 사이의 관계에 대하여)

  • LEE DAE-YOUNG;MIN KYOUNG WOOK
    • Publications of The Korean Astronomical Society
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    • v.15 no.spc2
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    • pp.53-56
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    • 2000
  • We investigate the critical issue on how the BBF (bursty bulk flow) is related to the substorm current wedge formation. Observationally, after analysing data sets from Geotail spacecraft at near tail and many ground magnetic observatories for 9 months period of 1996, we find three BBF events that clearly occurred at the center of the wedge with region I type FAC (field-aligned current), and two other BBF events that were seen outside the wedge sector. Theoretically, we suggest that the substorm current wedge generation by BBF is most likely when the h' VB contribution is dominant in the well-known MHD $J_{II}$ expression (Vasyliunaus, 1984) or when the divergence of the cross-tail current carried by the particle's gradient/curvature drift is predominantly sufficient at the moment of the BBF arrival at near tail.

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Wind Mapping of Singapore Using WindSim (WindSim을 이용한 싱가폴 바람지도 작성)

  • Kim, Hyun-Goo;Lee, Jia-Hua
    • Journal of Environmental Science International
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    • v.20 no.7
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    • pp.839-843
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    • 2011
  • We have established a wind map of Singapore, a city-state characterized its land cover by urban buildings to confirm a possibility of wind farm development. As a simple but useful approximation of urban canopy, a zero-plane displacement concept was employed. The territory is divided into 15 sectors having similar urban building layouts, and zero-plane displacement, equivalent roughness height at each sector was calculated to setup a terrain boundary condition. Annual mean wind speed and mean wind power density map were drawn by a CFD micrositing model, WindSim where Changi International Airport wind data was used as an in-situ measurement. Unfortunately, predicted wind power density does not exceed 80 $W/m^2$ at 50 m above ground level which would not sufficient for wind power generation. However, the established Singapore wind map is expected to be applied for wind environment assessment and urban planning purpose.