• 전기의세계
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• 제28권5호
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• pp.49-55
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• 1979

During severe emergencies which result in insufficient generation to meet load, an automatic load shedding method considering the spinning and operating reserve can establish the optimum system operation. This paper presents methods and results of a study on the optimum operating scheme with spinning and operating reserve power in case of outage of large generator units to prevent frequency decay and continue stable operation. This study covers following three parts 1) Analysis of spinning reserve characteristics 2) Determination of operating reserve requirements 3) Development of the optimum load shedding programs By this study the optimum system operating method was recommended for reliable operation of power system.

• 대한전기학회논문지:전력기술부문A
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• 제55권10호
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• pp.440-445
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• 2006

As an electricity industry transforms into a competitive system, an electricity market revolves into a combined market consisting of generation and operating reserve. This paper presents a market model combined by an energy market and an operating reserve market. In a competitive structure, Gencos strive to choose strategic bidding parameters that maximize total profit resulting from an energy market and a reserve market. The primary goal of the paper is to analyze power transactions of generation and operation reserve based on marginal profits and capacity limits at NE(Nash Equilibrium). In case studies, the reserve market and the energy market are compared at the n from the viewpoints of marginal profits, prices and transaction quantities. It is shown that the marginal profit in an energy market is equal to that in a reserve market, and Gencos strategic bidding is greatly influenced by capacity limit.

• 전기의세계
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• 제24권5호
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• pp.97-102
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• 1975

This paper describes the result of a Study for the Optimum Operating method with Spinning reserve in case of outage of large generator unit to improve the system stability and prevent the system frequency drop. This is usually done by governor free operation, so we focused our attention to the operating Char acteristics of spinning reserve. Nexy, a study was made to mesure the upper limit of Spinning reserve and when this upper limit cannot match the required power, a relationship between the amount of spinning reserve and that of the load shedding requirement was searched with regard to several system operating conditions to use it in our future system operation. By this study, the optimum system operating method was recommended for reliable operation of power system.

• Journal of Electrical Engineering and Technology
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• 제10권2호
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• pp.511-517
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• 2015

Determination of the required reserve capacity has an important function in operation of power system and it is calculated based on the largest loss of supply. However, conventional method cannot be applied in future power system, because potential grid-connected distributed generator and abnormal temperature cause the large load imbalance. Therefore this paper address new framework for determining the optimal required reserve capacity taking into account the real time load imbalance. At first, we introduce the way of operating reserve resources which are the secondary, tertiary, Direct Load Control (DLC) and Load shedding reserves to make up the load imbalance. Then, the formulated problem can be solved by the Probabilistic Dynamic Programming (PDP) method. In case study, we divide two cases for comparing the cost function between the conventional method and the proposed method.

• 대한전기학회논문지:전력기술부문A
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• 제52권5호
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• pp.287-293
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• 2003

The deregulation and structural reform of power markets have started from the early 90s, which has brought about new studies on the new environment. Regardless the market structure, however, power systems need to be operated and planned in a stable and reliable manner. Therefore, decisions on proper amount of operating reserves and their reliable operations are very important. Up to now, the decision processes of operating reserves depend mainly on experiences of operators in Korea. When Korean power market comes under private management, operating reserves would influence power rate as well as power Quality, Therefore, it is time to prepare reasonable operating reserve standards in a systematic way for the new environment. This study suggests the proper operating reserve standards considering rules of the power market in Korea. To verify the adequacy of the proposed standards, stability and frequency characteristics of the Korean power system are analyzed as well.

• KIEE International Transactions on Power Engineering
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• 제5A권4호
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• pp.396-402
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• 2005

In an electricity market with imperfect competition, participants devise bidding plans and transaction strategies to maximize their own profits. The market price and the quantity are concerned with the operation reserve as well as the bidding system and demand curves in an electricity market. This paper presents a market model combined by an energy market and an operating reserve market. The competition of the generation producers in the combined market is formulated as a gaming of selecting bid parameters such as intersections and slopes in bid functions. The Nash Equilibrium (NE) is analyzed by using bi-level optimization; maximization of Social Welfare (SW) and maximization of the producers' profits.

• 한국비블리아학회지
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• 제32권1호
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• pp.199-221
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• 2021

우리나라 대학도서관에서는 미국과 달리 지정자료 및 e-Reserve 서비스 운영이 매우 저조한 실정이다. 본 연구는 국내 대학도서관의 e-Reserve 서비스 활성화를 위한 기초 자료를 제공하기 위하여 미국 131개 대학도서관의 e-Reserve 서비스 운영 사례를 살펴보았다. 운영 사례를 확인하기 위하여 131개의 대학도서관 웹사이트를 조사하였으며 중에서 7개 대학도서관의 e-Reserve 서비스 운영 방식을 비교 분석하고, 4개의 e-Reserve 지원 소프트웨어의 기능을 확인하였다. 연구결과는 국내 대학도서관에서 e-Reserve 서비스를 운영하는데 있어 참고자료로 활용될 수 있을 것이며 분석한 지원 소프트웨어의 기능은 시스템 도입 시 고려할 기능요건이 될 것으로 판단된다.

• 대한전기학회논문지:전력기술부문A
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• 제54권4호
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• pp.199-204
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• 2005

In an electricity market with an imperfect competition, participants make plans of bidding and transaction strategies to maximize their own profits. The market price and the quantity are concerned with the operation reserve as well as the bidding system and demand curves in an electricity market. This paper presents a market model combined by an energy market and an operating reserve market. The competition of the generation producers in the combined market is formulated as a gaming of selecting bid parameters such as intersections and slopes in bid functions. The Nash Equilibrium(NE) is analyzed by using a hi-level optimization; maximization of Social Welfare(SW) and maximization of the producers' profits.

• 조명전기설비학회논문지
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• 제22권9호
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• pp.55-61
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• 2008

최근 전력수요의 높은 증가율로 인하여 전력계통에 가장 안정적으로 전력을 공급하기 위한 적정예비력을 얼마만큼을 가져야 할 것인가? 하는 필요성이 강조되고 있다. 본 연구에서는 연도별 계통규모와 예비력 및 예비율의 변화 풍향 분석을 통하여 계통규모가 증가할수록 적정 예비력은 증가하고 있는 반면에 예비율은 하락하는 추세를 보이고 있는 것을 분석하였다. 이 자료를 관계로 현재시점에서 단기 전력수급전망에 적용되는 공급예비력으로 산정한 600만[kW]는 적정수준이라 여겨진다. 또한 최대전력수요가 5,000만[kW]를 넘어서면서 적정수준인 $10{\sim}12[%]$ 예비율 보다는 적정수준의 예비력을 산정하여 적용하는 것이 전력계통을 경제적이고 안정적으로 운영할 수 있다고 분석되었다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 A
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• pp.751-753
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• 2005

In this raper, Economic value of reserve margin i.i presented by opportunity cost for Korean power system, and the level of compensation for spinning reserve that is necessary to operate power system stably is proposed. The generator that is giving up for opportunity to participate in energy market must take opportunity cost. it is relative to not only whole demand level but also marginal cost of each resource. In this paper, assume that all resource in Korea is equivalent to six generator for simulation. and we evaluate value of reserve in the time of high demand and low demand. Also we propose the way to improve a evaluation method by examine relationship between capacity payment and value of reserve.