• Title/Summary/Keyword: Load curtailment

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Load Shedding Algorithm Using Linear Programming for Congestion Problems by a Major Contingency

  • Shin Ho-Sung;Song Kyung-Bin
    • KIEE International Transactions on Power Engineering
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    • v.5A no.4
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    • pp.371-377
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    • 2005
  • Congestion problems of transmission lines are very important research issues in power system operations. Load curtailment is one of the ways to solve congestion problems by a major contingency. A systematic and effective mechanism for load shedding has been developed by investigating congestion distribution factors and the direct load control program. In this paper, a load shedding algorithm using linear programming for congestion problems by a major contingency is presented. In order to show the effectiveness of the proposed algorithm, it has been tested on the 6-bus sample system and the power system of Korea, and their results are presented.

A study on the efficiency of sloped type Double-skin System for the Curtailment of Heating/Cooling Load (냉난방부하 절감을 위한 경사형 이중외피시스템의 성능연구)

  • An, Hyung-Jun;Kim, Young-Tag;Choi, Chang-Ho;Lee, Hyn-Woo
    • Journal of the Korean Solar Energy Society
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    • v.24 no.4
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    • pp.77-87
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    • 2004
  • BIPV or double skin applied to the surface of the building, power and thermal load cannot both be increased. In the case of BIPV, because it is applied to the facade, incident solar energy decreases and efficiency drops off. The system in this paper complements these disadvantages and aims to decrease the heating & cooling load by transforming solar energy to electronic and thermal energy. The research in this paper is about the applicability of the clear PV attached double-skin system. And the PV electronic generation and the factors that affect the heating & cooling load such as the daily radiation, sun shading ratio, heating & cooling load, daylight luminance and glare distributions in the building are simulated.

Load Shedding Algorithm Using the Linear Programming for Congestion Problems by a Major Contingency (주요 상정사고로 인한 송전혼잡 문제에 대한 선형계획법을 이용한 부하차단 알고리즘)

  • Shin, Ho-Sung;Kim, Byoung-Su;Song, Kyung-Bin;Han, Seung-Ho;Lee, Hak-Ju;Kwon, Seong-Chul
    • Proceedings of the KIEE Conference
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    • 2005.07a
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    • pp.30-32
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    • 2005
  • Due to a major contingency, the congestion of the transmission may happen in power systems. In order to manage the congestion problem, load curtailment is one of the ways to resolve the problem. It is essential that the systematic and effective mechanism for the load shedding be developed. In this paper, the load shedding algorithm using the linear programming for the congestion problems by a major contingency is proposed. The simulations of the proposed algorithm are performed for the power system of Korea and their results are presented.

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A Study on Mechanism of Load Shedding (부하차단 메카니즘에 관한 연구)

  • Shin Ho Sung;Moon Jong Fil;Kim Jae Chul;Song Kyung Bin
    • Proceedings of the KIEE Conference
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    • summer
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    • pp.162-164
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    • 2004
  • Electrical power peak demand of Republic of Korea is annually growing and the peak demand has occurred in the summer. It is difficult that we handle with constructing power plants and increasing generation capacity to cope with a suddenly increased demand due to the cost problem, difficulty to find the new plant site, and the spread of the NIMBY. The alternative of the above problem is to efficiently manage demand of electrical power. Accordingly, load shedding of a section of demand side management is investigated. First we surveyed a trend of research in the domestic and overseas, for load curtailment and demand response program. After reviewing several demand response programs, the future research direction for load shedding in emergency and normal operation is introduced.

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A Situations and Improvements on the Rail Freight System (철도화물수송체계의 현황과 개선방안)

  • 이용상
    • Journal of the Korean Society for Railway
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    • v.7 no.1
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    • pp.37-48
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    • 2004
  • In this paper, I explain the situations and problems which are focused on the rail freight system. We have a many problems, which have been showed the long freight logistics time, and inadequate fare system. And rail freight system does not have a efficient marketing system, and unit load system. Therefore rail freight has been decreased modal share, which is estimated from 9.65% in 1995 to 6.25% in 2001(ton base). Recently, EU nations and America rail freight system reveals a good outcome, which keeps the balance in the black. The main factors which go into the black, is the enlargement the investment in rail freight and efficient management focusing on the unit load system, fare system, and personnel management. I suggest the several improvement ways, which will be helpful to advance the rail freight system. Fistly, I suggest the speed up the freight rail and efficient fare system. Secondly, I propose the unit load system and the regulation the truck focusing on curtailment of the social cost. Lastly, I make an overture of establishment the comprehensive logistics system.

Micro-Grids Reliability Enhancement Under Different Penetration Levels of Hybrid DG Units

  • Essam, M.;Atwa, Y.M.;El-Saadany, Ehab F.;Conti, Stefania;Rizzo, Santi Agatino
    • Journal of Electrical Engineering and Technology
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    • v.13 no.4
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    • pp.1407-1418
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    • 2018
  • Novel mechanism of customized adequacy formulation is proposed in order to enhance micro grids system reliability. The mechanism accounts for 2-levles of load curtailment, and is mainly based on probabilistic load profile and hybrid Distributed Generation (DG) units modeling. The two load curtailments are needed in order to ensure adequate technical constraints at steady state condition during islanding mode of operation. The effectiveness of the proposed formulation has been verified using system independent analytical expressions for the evaluation of both reliability and Expected Energy Not Served (EENS) indices. The evaluation has examined the impact of different penetration levels of Hybrid DG Units in case study islands. Results show the enhancement of the overall distribution system reliability and the recommended conditions for successful islanding mode of operation.

Voltage Stability Constrained Optimal Power Flow based on Successive Linear Programming (전압안정도를 고려한 연속선형계획법 기반 최적조류계산)

  • Bae, Seung-Chul;Shin, Yong-Son;Lee, Byong-Jun
    • Proceedings of the KIEE Conference
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    • 2003.11a
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    • pp.220-223
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    • 2003
  • This paper presents VSCOPF(Votage Stability Constrained Optimal Power Flow) algorithm based on SLP(Successive Linear Programming) to interpret the large scale system. Voltage stability index used to this paper is L index to be presented by function form. The objective function consists of load shedding cost minimization. Voltage stability indicator constraint was incorporated in traditional OPF formulation. as well as the objective function and constraints are linearlized and the optimal problem is performed by SLP(Successive Linear Programming). In this paper, the effect of voltage stability limit constraint is showed in the optimal load curtailment problems. As a result, an optimal solution is calculated to minimize load shedding cost guaranteeing voltage security level. Numerical examples using IEEE 39-bus system is also presented to illustrate the capabilities of the proposed formulation.

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Optimal Division Model Configuration Plan According to 6 Divisions 3 Ties in Korea Distribution System (국내 배전계통의 6분할 3연계 최적분할 모델 구성방안)

  • Lee, Dae-Dong;Son, Sung-Hwan;Ha, Bok-Nam;Hyun, Dong-Seok;Kim, Young-Dal
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.59 no.4
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    • pp.428-433
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    • 2010
  • According as economy grows, demand for power increases and satisfaction of customer about electricity quality is rising. There is in trend that investment expense by continuously increased supply of electric power equipment is on the increase continuously, but management efficiency improvement through curtailment of supply of electric power equipment investment expense through efficient operation is required rather than to increase investment. In this study, reconsidered about 6 divisions 3 ties that is distribution line basis configuration of Daejeon Geumsan area and analyzed division and tie present condition of truthful distribution System. Examined problem analyzing average division number, tie number and tie switch number, searched about most suitable division that consider load. Hereafter, I wish to take advantage of analysis result in most suitable division and tie of truthful distribution system for power failure section reduction and investment expense curtailment.

A Design of Incentive-based DR Program using Analytic Hierarchy Process(AHP) (계층분석과정(AHP)을 이용한 지원금 기반 수요반응프로그램 설계)

  • Kim, Dong-Min;Kim, Young-Hyun;Kim, Jin-O;Lee, Chang-Ho
    • Proceedings of the KIEE Conference
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    • 2009.07a
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    • pp.589_590
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    • 2009
  • This paper presents a unique approach to scheme a demand response (DR) program in the electricity market from a customer-oriented perspective, which is based on the analytic hierarchy process (AHP). The proposed program is designed as an incentive-based program (IBP) considering Korea power systems with the cost-based generation pool (CBP). And the proposed DR program has the objective to maximize social welfare corresponding customers‘ participation and the constraints including incentive payments, the specific load curtailment conditions and reserve-margin criterion. A test system for the case study is used to demonstrate the usefulness and applicability of the proposed approach, and the load profiles with the proposed DR program are obtained. The results show not only the revenue attributable to the avoided costs but also enhancement of system reliability.

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Optimal Coordination of Intermittent Distributed Generation with Probabilistic Power Flow

  • Xing, Haijun;Cheng, Haozhong;Zhang, Yi
    • Journal of Electrical Engineering and Technology
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    • v.10 no.6
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    • pp.2211-2220
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    • 2015
  • This paper analyzes multiple active management (AM) techniques of active distribution network (ADN), and proposes an optimal coordination model of intermittent distributed generation (IDG) accommodation considering the timing characteristic of load and IDG. The objective of the model is to maximize the daily amount of IDG accommodation under the uncertainties of IDG and load. Various active management techniques such as IDG curtailment, on-load tap changer (OLTC) tap adjusting, voltage regulator (VR) tap adjusting, shunt capacitors compensation and so on are fully considered. Genetic algorithm and Primal-Dual Interior Point Method (PDIPM) is used for the model solving. Point estimate method is used to simulate the uncertainties. Different scenarios are selected for the IDG accommodation capability investigation under different active management schemes. Finally a modified IEEE 123 case is used to testify the proposed accommodation model, the results show that the active management can largely increase the IDG accommodation and penetration.