• Title/Summary/Keyword: relay agent

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Multi-Agent System having Adaptive Over Current Protection Function for Power Distribution Systems (멀티 에이전트 시스템 (Multi-Agent System)을 이용한 배전계통의 적응 과전류보호)

  • Chang, Choong-Koo;Lee, Seung-Jae;Lim, Dong-Jin
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.50 no.8
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    • pp.365-372
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    • 2001
  • This paper presents a new protection concept to achieve the adaptive optimal function by introducing the multi-agent system technology. Making each relay an agent which consists of relay agent module and coordinator module, each agent works autonomously to improve protection capability by cooperating with other agents. It is applied to the overcurrent protection system of the industrial power system in order to show the feasibility of the proposed methodology.

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Agent-Based Distance Relaying Algorithm for Phase-to-Ground Faults (에이전트 환경에서의 1선지락 거리계전 알고리즘)

  • Hyun, Seung-Ho;Jin, Bu-Gun;Lee, Seung-Jae
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.56 no.11
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    • pp.1885-1891
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    • 2007
  • This paper presents a distance relaying algorithm for phase-to-ground faults in transmission lines under Multi-Agent protection environment. In normal condition, a distance relay agent stores the latest states, e.g., voltage of source side, voltage of the opposite side and the loading conditions, etc., through communication between the agents. Once a fault occurs, the relay calculates the fault location using the knowledge about the states just before the fault happens. This stand-alone operation is to improve reliability under the fault condition at which the accuracy or time required for communication may not be guaranteed. The mathematical expression of fault location is derived through loop analysis, before hand, in the manner that both fault current from the opposite end and fault resistance are included implicitly so that their effects are minimized. The suggested algorithm is applied to a typical transmission system with two power sources on both ends to show its effectiveness.

Mobility Management Scheme Using Efficient Relay Agent in Nested Mobile Networks (중첩된 이동망에서 효율적 릴레이 에이전트를 사용하는 이동성 관리 기법)

  • 이재걸;홍충선;이재조
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.28 no.10A
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    • pp.796-806
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    • 2003
  • Mobile Node usually communicate with CN bia only it's own HA but Nested Mobile Networks correspond with CN bia all HA involved with them. when Mobile Network of a MR moves from its home link to a foreign link in the stationary network. then Mobile Network of another MR moves from its home link in stationary network to foreign link in previous mobile network. CN send Packet destined to the latter MR via both Home Agent of the former MR and the latter MR. There are two problem in this scenario. One is inefficient routing path that bypass via several HA. the other is waste of transmission resource and delay of Registration process which change of Nested Mobile Network Architecture cause Mobile Router. so We propose MRA(Mobile Relay Agent) to support effective routing by local mobility management.

Implementation of Auto-reclosing Relay Algorithm based on Multi-Agent System using EMTP-MODELS (EMTP-MODELS를 이용한 Multi-Agent System 기반의 자동 재폐로 계전 알고리즘 구현)

  • Lee, Byung-Hyun;Yeo, Sang-Min;Lee, You-Jin;Kim, Chul-Hwan;Sung, No-Kyu
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.57 no.1
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    • pp.8-13
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    • 2008
  • This paper presents auto-reclosing algorithms with reference to power system stability based on MAS(Multi-Agent System). And this paper shows auto-reclosing algorithms considering power system stability. It includes the variable dead time, optimal reclosing, sequential reclosing, emergency extended equal-area criterion(EEEAC) algorithm, and modified EEEAC algorithm. This paper divides Auto-reclosing algorithms into respectively agents according to their tasks. A separated agent is merely a software entity that is situated in some environment and is able to autonomously react to changes in the environment. And all the simulations in this parer were tested by EMTP MODELS.

A Service Restoration Algorithm for Power Distribution Networks Applying the Multi-Agent System

  • Jung Kwang-Ho;Cho Myeon-Song;Lee Seung-Jae;Lim Seong-Ll
    • KIEE International Transactions on Power Engineering
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    • v.5A no.2
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    • pp.125-131
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    • 2005
  • Service restoration is one of the most important missions in distribution system operation. This paper proposes a multi-agent system approach to distribution system restoration. Every relay is developed as an agent by adding its own intelligent, self-tuning and communication ability. The relay agent independently calculates and corrects its restoration index through communication with neighboring agents and its own intelligence. The proposed algorithm is applied to a simple network to demonstrate its soundness and effectiveness.

A study on Service Restoration Systems for Power Distribution Networks by Applying Multi-Agent System (멀티에이전트 시스템을 이용한 배전계통 사고복구시스템에 관한 연구)

  • Jung K.H.;Choi M.S.;Lee S.J.
    • Proceedings of the KIEE Conference
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    • summer
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    • pp.403-405
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    • 2004
  • A service restoration is one of the most important missions in distribution system operation. This paper proposes a multi-agent system approach to distribution system restoration. Every relay is developed as an agent by adding its own intelligent, self-tuning and communication ability. Relay agent calculates and corrects its restoration index by itself through communication with neighboring agents and its own intelligence. The proposed algorithm is applied to a simple network to show how to calculate restoration index. Keywords Multi-Agent System, Service Restoration, Distribution Networks

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An Autonomous Optimal Coordination Scheme in a Protection System of a Power Distribution Network by using a Multi-Agent Concept

  • Hyun, Seung-Ho;Min, Byung-Woon;Jung, Kwang-Ho;Lee, Seung-Jae;Park, Myeon-Song;Kang, Sang-Hee
    • KIEE International Transactions on Power Engineering
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    • v.2A no.3
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    • pp.89-94
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    • 2002
  • In this paper, a protection system using a Multi-Agent concept for power distribution networks is proposed. Every digital over current relay(OCR) is developed as an agent by adding its own intelligence, self-tuning and communication ability. The main advantage of the Multi-Agent concept is that a group of agents work together to achieve a global goal which is beyond the ability of each individual agent. In order to cope with frequent changes in the network operation condition and faults, an OCR agent, suggested in this paper, is able to detect a fault or a change in the network and find its optimal parameters for protection in an autonomous manner considering information of the whole network obtained by communication between other agents. Through this kind of coordination and information exchanges, not only a local but also a global protective scheme is completed. Simulations in a simple distribution network show the effectiveness of the suggested protection system.

Development of intelligent agent system for automated ship CAE modelling by non-deterministic optimized methods (비 결정론적 최적화 기법을 이용한 선박의 CAE 모델링 자동화를 위한 지능형 에이전트 시스템의 개발)

  • Bae, Dong-Myung;Kim, Hag-Soo;Shin, Chang-Hyuk;Wang, Qing
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.44 no.1
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    • pp.57-67
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    • 2008
  • Recently, Korean shipbuilding industry is keeping up the position of world wide No. 1 in world shipbuilding market share. It is caused by endless efforts to develope new technologies and methods and fast development of IT technologies in Korea, to raise up its productivities and efficiency in shipbuilding industry with many kinds of optimizing methods including genetic algorithm or artificial life algorithm... etc. In this paper, we have suggested the artificial life algorithm with relay search micro genetic algorithm. and we have improved a defect of simple genetic algorithm for its slow convergence speed and added a variety of solution candidates with applying relay search simple genetic algorithm. Finally, we have developed intelligent agent system for ship CAE modeling. We have tried to offer some conveniences a ship engineer for repeated ship CAE modeling by changing ship design repeatedly and to increase its accuracy of a ship model with it.

A Study on the Obstacle Process of the Credit Card Settlement System (신용카드 결제 시스템의 장애처리에 관한 연구)

  • Ah, Ik-Soo;Hwang, Lak-Hoon
    • Journal of the Korea Society of Computer and Information
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    • v.11 no.1 s.39
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    • pp.237-242
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    • 2006
  • Currently, the settlement system which is used at credit card settlement from the member store of the off-line credit card is composed of the credit card settlement terminal, the VAN company which does a settlement relay service and the credit card company. When the obstacle occurs from the credit card company, the VAN company which does a settlement relay service conducts an approval vicarious execution, but when the obstacle occurs from the VAN company, the credit card settlement service is not accomplished smoothly. The dissertation implement the credit card settlement system which receives a settlement relay service that credit card settlement terminal uses a Telegram Conversion Agent from the other VAN company when the VAN company obstacle occurs.

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The Credit Card Settlement System using the Switching Agent (Switching Agent를 이용한 신용카드 결제 시스템)

  • Ahn Ik-Soo;Hwang Lak-Hoon
    • Journal of the Korea Society of Computer and Information
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    • v.10 no.3 s.35
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    • pp.339-344
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    • 2005
  • Currently the credit card settlement system which is used from off-line credit card joining point is composed of the credit card settlement terminal, the VAN company which do settlement relay service and the credit card company. When the credit card company occurs obstacle, the service VAN company executes as proxy an approval and it controls. When the service VAN company occurs obstacle, the credit card settlement service does not become accomplished in the normality. The dissertation which it sees when the service VAN company occurs obstacle, the possibility of doing a settlement relay service from the different VAN company in order to be, proposed the credit card settlement system which uses the Switching Agent.

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