• 제목/요약/키워드: Distribution Feeder

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Long-term Distribution Planning considering economic indicator (경제지표를 이용한 중장기 배전계획 수립에 관한 연구)

  • Choi, Sang-Bong;Kim, Dae-Kyeong;Jeong, Seong-Hwan;Bae, Jeong-Hyo;Ha, Tae-Hyun;Lee, Hyun-Goo;Kim, Jeom-Sik;Moon, Bong-Woo;Han, Sang-Yong
    • Proceedings of the KIEE Conference
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    • 1999.07c
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    • pp.1468-1471
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    • 1999
  • This paper presents a method of the regional long-term distribution planning considering economic indicator with the assumption that energy demands proportionally increases with the economic indicators. For the practical distribution planning, it is necessary to regional load forecasting, distribution substation planning, distribution feeder planning. Accordingly, in this paper, after performing regional load forecasting considering economic indicator, it is performed distribution substation planning and distribution feeder planning in order by using this result. For accurate distribution planning, it is very important to scrutinize the correlation among the regional electric power demands, economic indicator and other characteristics because distribution planning results may vary depending on many different factors such as electric power demands, gross products, social trend and so on. In this paper, various steps microscopically and macro scopically are used for the regional long-term distribution planning in order to increase the accuracy and practical use of the results

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Analysis of the Switch Installation Criteria by Increasing Operating Capacity in Distribution Line (배전선로 운전용량 상향에 따른 개폐기 설치 기준 분석)

  • Jo, Nam-Hun;Ha, Bok-Nam;Lee, Heung-Ho
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.51 no.6
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    • pp.290-295
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    • 2002
  • The present assignment in installing the number of switches for distribution line was made on the basis of a normal feeder capacity 7,000kVA in KEPCO(Korea Electric Power Corporation), Korea. But the normal capacity is revised to 10000kVA in 1998. Even increasing limit of the operating capacity of the distribution lines enables us to give some benefit for the operation flexibility and investment cost of the distribution system. It is disadvantageous in the viewpoint of supply reliability. In distribution systems, switches are equipped to improve the reliability of distribution systems by minimizing the outage section due to fault and maintenance. Utility generally improves the reliability by minimizing the length of outage section, which is caused by fault and maintenance, through switch equipment on distribution system. In order to cope with the changes such as operation capacity, it is necessary to study whether the present criteria is reasonable or not, also to confirm whether the present criteria of installing switches in line is improved or not. In this study, we proposes the number of switch per feeder on the basis of present operation capacity in distribution system.

An Expert System for Protection Coordiantion in 22.9KV Distribution System Design (22.9KV 배전설게 보호협조을 위한 전문가 시스템)

  • 김호용;고윤석;손수국;남기영
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.39 no.2
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    • pp.119-132
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    • 1990
  • To design protection coordination for an electric power distribution system, an expert system is developed, using both the veteran expert's heuristics and the guide book for the distribution facility operation considering feeder configuration, service route, load characteristics fault current and load current. The expert system developed in this papaer determines the type of protective device(clearing current and sequence). The location and rating change of protective device in the old feeder is realized by using old database. Current(T-C) curves of various kinds of protective devices are stored in Knowledge Base (KB). The expert system is developed on a 32 bit personal computer using PROLOG, AutoCAD,dBASEIIIPLUS and FORTRAN. To compute the fault current and loadflow, FORTRAN is used.

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A fault location algorithm using iterative method at unbalance conditions for distribution feeder systems (불평형시 반복추정기법을 이용한 배전계통 고장점 표정 알고리즘)

  • Lee, D.S.;Jin, B.G.;Lee, S.J.;Choi, M.S.;Kang, S.H.;Ahn, B.S.;Yoon, N.S.
    • Proceedings of the KIEE Conference
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    • 2001.11b
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    • pp.121-123
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    • 2001
  • This paper presents a fault location algorithm using iterative method at unbalance condition for distribution feeder systems. Distribution feeders include single phase and three phase laterals. The proposed algorithm achieves a high accuracy by continuously updating voltage and current phasor using the phase components and admittance load model.

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Chaotic Neural Networks for Optimal Reconfiguration in Distribution Systems (카오스 신경망을 이용한 배전계통 최적 구성)

  • Rhee, Sang-Bong;Kim, Kyu-Ho;Lee, Yu-Jeong;You, Seok-Ku
    • Proceedings of the KIEE Conference
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    • 2001.07a
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    • pp.279-281
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    • 2001
  • This paper presents a chaotic neural networks to solve the distribution feeder reconfiguration problem for loss reduction. Feeder reconfiguration problem is the determination of switching option that minimizes the power losses for a particular set of loads in distribution systems. A chaotic neural networks is used to determine the switching combinations, select the status of the switches, and find the best combination of switches for minimum loss. The proposed method has been tested on 32 bus system, and the results indicate that it is able to determine the appropriate switching options for optimal configuration.

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A Study on Application of BESS at Distribution System (배전시스템에 전지전력저장시스템의 적용에 관한 연구)

  • Kim, Yong-Sung;Moon, Sun-Ho;Chu, Dong-Wook;Kim, Eung-Sang;Kim, Jae-Chul
    • Proceedings of the KIEE Conference
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    • 1997.07c
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    • pp.867-870
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    • 1997
  • This paper presents application of battery energy storage system(BESS) for interconnection with power distribution system. We configured interconnection model using PSCAD/EMTDC program. The simulation for voltage regulation on BESS interconnection with power distribution analyzes transient voltage variation, steady state voltage variation, and voltage of reverse power flow at interconnected feeder and nearby feeder.

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A Study of the Terminal Developement for Distribution Automation System (배전 자동화용 단말장치 기술 개발및 전원 구성에 관한 연구)

  • Kye, Moon-Ho;Kim, Jong-Soo;Jung, Je-Wook;Nam, Hyo-Sung;Park, Jong-Jin
    • Proceedings of the KIEE Conference
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    • 1993.07b
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    • pp.902-904
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    • 1993
  • This paper contains the terminal developement for the feeder remote unit in Korea Distribution Automation System. This terminal unit has serval functions in order to do feeder auotmation as following, the open/close controls and gathering status informations of switchgears, getting line currents and voltages, distribution fault. So FRU has four modules to do those functions-Logic Controller, Relay Controller, Data Acquisition, Display, Power Supply etc. The FRU should be on allays, so AC power is supplied before & behind the switchgear. Power Supply is made up with AC/DC, DC/DC, Battery and/or SOLAR CELLS & CONTROLLER. It is important for the supply to protect against some Surges, because surges are happened so many times. Surge test is fellowing the standard IEC 801-5 or IEEE 587.

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A Study on Enhancement Method of Hosting Capacity for PV System Based on Primary Feeder Reconfiguration (배전선로 절체에 의한 태양광전원의 수용성 향상방안에 관한 연구)

  • Lee, Myung-Geun;Lee, Hu-Dong;Ferreira, Marito;Park, Ji-Hyun;Tae, Dong-Hyun;Rho, Dae-Seok
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.20 no.11
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    • pp.239-249
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    • 2019
  • Recently, the Korean government has implemented a policy to expand renewable energy sources. Large-scale PV systems are being actively interconnected with the distribution system. On the other hand, when a large-scale PV system is installed and operated, the customer voltages could violate the allowable voltage limit due to reverse power flow of the PV system. To overcome these problems, an enhancement method for hosting the capacity of the PV system in a distribution system is being actively conducted. Therefore, to improve the hosting capacity of the PV system, this paper proposes a model of a reconfiguration of the distribution system, which is composed of three sections and three connections based on PSCAD/EMTDC S/W, and proposes an evaluation algorithm for the feeder reconfiguration to maximize an adaption of the PV system. In addition, this paper presents the optimal method of the feeder reconfiguration section to evaluate the maximum capacity of the PV system to keep customer voltages within the allowable voltage limits based on various operation scenarios, such as the capacity of a PV system and section of feeder reconfiguration. From the simulation results based on the PSCAD/EMTDC modeling and evaluation algorithm, it was confirmed that they are a useful and practical tool to enhance hosting the capacity of a PV system in a distribution system.

Application of Fault Location Method to Improve Protect-ability for Distributed Generations

  • Jang Sung-Il;Lee Duck-Su;Choi Jung-Hwan;Kang Yong-Cheol;Kang Sang-Hee;Kim Kwang-Ho;Park Yong-Up
    • Journal of Electrical Engineering and Technology
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    • v.1 no.2
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    • pp.137-144
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    • 2006
  • This paper proposes novel protection schemes for grid-connected distributed generation (DG) units using the fault location algorithm. The grid-connected DG would be influenced by abnormal distribution line conditions. Identification of the fault location for the distribution lines at the relaying point of DG helps solve the problems of the protection relays for DG. The proposed scheme first identifies fault locations using currents and voltages measured at DG and source impedance of distribution networks. Then the actual faulted feeder is identified, applying time-current characteristic curves (TCC) of overcurrent relay (OCR). The method considering the fault location and TCC of OCR might improve the performance of the conventional relays for DG. Test results show that the method prevents the superfluous operations of protection devices by discriminating the faulted feeder, whether it is a distribution line where DG is integrated or out of the line emanated from the substation to which the DGs are connected.

Weavability Limit of Yarns with Thickness Variation in Shuttleless Weaving

  • Seyam, Abdelfattah M.
    • Fibers and Polymers
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    • v.4 no.4
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    • pp.176-181
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    • 2003
  • Theoretical weavability limit relationships of fabrics from regular warp yarns and fancy filling yams with thickness variation in shuttleless weaving are reviewed. The relationships correlate maximum warp and filling cover factors, warp and filling yarn characteristics, the distribution of thick and thin places of filling yarn over the fabric surface, and the warp and filling weave factor. The research considers single filling feeder and multiple feeders cases. Additionally, comparisons between the weavability limit of regular yarns and fancy yams in shuttle and shuttleless weaving are given.