• Title/Summary/Keyword: Service Restoration

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A Comparison of Restoration Schemes in Multiprotocol Label Switching Networks (MPLS망의 보호 복구 기술의 비교)

  • 오승훈;김영한
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.27 no.4C
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    • pp.316-325
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    • 2002
  • This paper investigates the restoration schemes which are applied to the MPLS domain upon a network failure. We define the following three restoration service models by combining the various restoration schemes: "FIS-based protection service" (FIS: failure indication signal), "inversion traffic protection service" and "1+1 protection service". After a qualitative analysis of the performance in them, we have analyzed it on quantitative basis by the simulation. According to the simulation results, "1+1 protection service" guarantees the fastest and most lossless restoration service among them; however, it results in consuming considerable bandwidth and producing an amount of control traffic, which means poor network utilization. On the other hand, "FIS-based protection service" spends less bandwidth and generates less control traffic, which means better network utilization, but produces poor restoration service. "Inversion traffic protection service" provides the medium restoration service and utilization between "1+1 protection service" and "FIS-based protection service."

An Improved Service Restoration Algorithm under Consideration of Abnormal Conditions in Distribution Automation Systems

  • Cho, Namhun;Kim, Insung;Lee, Sungwoo
    • KEPCO Journal on Electric Power and Energy
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    • v.1 no.1
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    • pp.47-54
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    • 2015
  • The most important function in distribution automation system (DAS) is the service restoration. KEPCO's current service restoration provides a very effective restoration service. However, it has been developed without the consideration of unexpected abnormal conditions that may occur while processing the sequence of switching operations. The objective of this paper is to provide practical service restoration schemes under consideration of abnormal conditions. The proposed service restoration schemes have been integrated to a branch office (B/O) in KEPCO. The proposed method strongly supports the conventional service restoration and adds to its value.

The Service Restoration Algorithm of The New Distribution Automation System (신 배전자동화시스템의 배전선로 고장복구 알고리즘)

  • Cho, Nam-Hun;Ha, Bok-Nam;Lee, Jung-Ho
    • Proceedings of the KIEE Conference
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    • 1998.11a
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    • pp.276-278
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    • 1998
  • This paper introduce an algorithm for service restoration in electric power distribution systems. Power utility performs service restoration in order to restore out-of-service areas at fault. Developing effective service restoration program is a cost-effective approach to improve service reliability and to enhance customer satisfaction. The main objective in service restoration program is to restore as much load as possible by transferring de-energized loads via network reconfigurations to other supporting distribution feeders without violating operating and engineering constrains.

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A Study on the Restoration Algorithm For Multi-Outage Areas in distribution system (광역고장을 고려한 정전 복구 알고리즘 연구)

  • Jung Jin Soo;Moon Hyun Kyung;Lim Seong Il;Lee Seung Jae
    • Proceedings of the KIEE Conference
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    • summer
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    • pp.381-383
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    • 2004
  • This paper presents for service restoration Abstract -in electric power distribution systems. The aim of the service restoration is an emergency control in distribution system to restore out-of service areas as soon as possible when a fault occurs in distribution system. For this reason, this paper presents a new service restoration strategy for multi-outage areas. Proposed algorithm consists of two methods. One is individual restoration scheme, the other one is integrated restoration scheme. The former determines restoration order of outage areas based on restoration index. If the former method can not generate a feasible restoration plan, the latter would try to find new configuration without overloaded section through tie exchange method.

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Improved Service Restoration technique by Using Dijkstra Algorithm in Distribution Systems (다익스트라 알고리즘을 이용한 배전계통의 향상된 사고복구 기법)

  • Kim, Nark-Kyung;Kim, Jae-Chul;Jeon, Young-Jae;Kim, Hoon
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.50 no.2
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    • pp.67-75
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    • 2001
  • This paper presents a fast and effective methodology for service restoration in large-scale distribution systems. The service restoration problem is formulated as a constrained optimization problem and requires the fast computation time and superior solution because the more unfaulted out-of-service area should be restored as soon as possible. The proposed methodology is designed to consider the fast computation time and priority service restoration by dijkstra algorithm and fuzzy theory in large-scale distribution systems. Simulation results demonstrate the validity and effectiveness of the proposed on a 26-bus and 140-bus system.

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Recovery of Ecosystem Service Functions through Ecological Restoration Practice: A Case Study of Coal Mine Spoils, Samcheok, Central Eastern Korea (훼손된 생태계의 복원을 통한 생태계 서비스의 회복: 채탄쓰레기 매립지 복원지의 사례)

  • Oh, Woo Seok;Lee, Chang Seok
    • Korean Journal of Environmental Biology
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    • v.32 no.2
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    • pp.102-111
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    • 2014
  • Ecological restoration is regarded as a major strategy for preventing biodiversity loss and thereby enhancing ecosystem service. This study was performed to evaluate ecosystem service value that the restored ecosystem provides. Ecosystem service was evaluated for provisioning and regulating services. The former service was evaluated by comparing similarities in a viewpoint of floristic composition to the reference site between the restored and the unrestored sites. Species composition of the restored site was found to be more similar to the reference site than that of the unrestored site and thereby restoration practice contributed for enhancing the provisioning service. Regulating service was evaluated based on microclimate control, soil amelioration, and improvement of water holding capacity. The value of ecosystem services in terms of microclimate control, soil amelioration, and improvement of water holding capacity was higher in the restored site than in the unrestored site. In consequence, ecological restoration of coal mine spoils contributed for enhancing the ecosystem service value of the corresponding site and thereby is rewarding the cost invested for restoration.

The Development of Multi-Fault Restoration Algorithm for Distribution Network (배전계통 광역 정전복구 알고리즘 개발)

  • Jung, Jin-Soo;Lee, Seung-Jae;Jung, Jong-Wook;Lim, Young-Bae;Bae, Seok-Myung;Yi, Geon-Ho
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.20 no.3
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    • pp.69-77
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    • 2006
  • This paper presents the service restoration in electric power distribution systems. The aim of the service restoration is to control an emergency taken place in distribution systems and to restore out-of service areas as soon as possible when a fault occurs in distribution systems. For this reason, new service restoration strategies in multi-outage area are suggested in this paper. The suggested algorithm consist of two schemes. One is an individual restoration scheme, the other is an integrated restoration scheme. The former determines a restoration order of outage areas based on a restoration index. Unless the former scheme can generate a feasible restoration plan, the latter one will try to find out a new configuration without an overloaded section through tie exchange method.

Monitoring Efficiency Evaluation of Camera Trapping in Terrestrial Mammals (카메라 트래핑을 이용한 육상포유류 모니터링 효율성 평가)

  • Chung, Chul-Un;Cha, Jin-Yeol;Kim, Young-Chae;Kim, Sung-Chul;Kwon, Gu-Hee;Lee, Hwa-Jin
    • Journal of the Korean Society of Environmental Restoration Technology
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    • v.17 no.3
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    • pp.65-74
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    • 2014
  • The aim of this study was to evaluate the monitoring efficiency of camera trapping in wild animals and to determine ways to increase its utilization. Nineteen sensor cameras were installed in Sobaeksan National Park from October 2012 to September 2013. During the study period, a total of 1045 terrestrial mammal photos were secured and 15 species habitats were identified. Shooting frequency was higher for medium and large mammals, especially full images of carnivores accounted for approximately 83%. A comparison of track surveys revealed that camera trapping was highly efficient and helped in capturing real image of species. The supply of lure and bait stimulates the sense of smell in carnivores, which further enhances the capturing of images by camera trapping. The results of this study provide data on the ecological characteristics of mammals, which can aid in determining habitat use by these animals, and thereby facilitate prevention of crop damage by wildlife.

Distributed Restoration System based on Multi-Agent for Improving Restoration in Distribution Automation System (배전자동화 시스템의 복구기능 향상을 위한 Multi-Agent 기반의 분산형 정전복구 시스템)

  • Lim, Seong-Il;Lim, Il-Hyung;Lee, Seung-Jae;Kwon, Sung-Chul;Ha, Bok-Nam;Choi, Myeon-Song
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.56 no.4
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    • pp.660-668
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    • 2007
  • In order to improve the efficiency of service restoration function in the current Distribution Automation System (DAS), in this paper it is proposed a more advanced and efficient service restoration approach using Multi-Agent technique based on distributed networks. In the current DAS, communication networks or protocol structures are centralized with communications between the central station and FRTU through 1:1 connection. In order to maintain the current systems and enhance the proposed Multi-Agent based service restoration scheme, a device of communication and intelligence, named MASX, is newly developed to make a FRTU as an agent to cooperate each others. the proposed system applied in a demo system for an distribution automation system and shows 8 times reduction of restoration time in restoration of blackouts.

A New Algorithm of The Line to Ground Fault Section Isolation & Restoration in Ungrounded Distribution Power System (비접지 배전 계통에서 지락사고 시 고장구간 분리 및 복구를 위한 새로운 알고리즘)

  • Choi In. S.;Choi Myeon. S.;Lim Seong. I.;Lee Seung. J.
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.53 no.10
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    • pp.550-555
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    • 2004
  • Fault section isolation and service restoration are very important for function of DAS. In Japan, a progressive protection method is used for the line to ground fault section isolation and service restoration. But the progressive protection method has a drawback that the customer will experience outage time and that the rate in use of the feeder is not over 50%. This paper presents a new Service Restoration Algorithm which is for the line to ground fault section isolation and service restoration method for a ungrounded distribution system. If the proposed algorithm is used, the rate in use of the feeder can improve than before because a distribution system can change multi connection of feeder and the customer's outage time can be reduced. The proposed algorithm has been successfully tested in a distribution system.