• 한국정보과학회논문지:정보통신
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• 제30권3호
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• pp.448-460
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• 2003

본 논문에서는 복구시간의 최소화 및 효율적인 복구자원 제공을 위해 세그먼트 자동복구 기법을 이용한 네트워크 고장 복구 방안을 제안한다. 세그먼트 자동복구는 대규모 통신망을 다수개의 소규모 서브네트워크로 분할하여 각 서브네트워크에서 자동복구를 수행하는데, 그 성능은 서브네트워크의 크기와 형태에 따라서 다양한 특성을 나타낸다. 대부분의 장애를 서브네트워크 내부에서 복구할 수 있기 때문에 복구시간이 줄어들게 된다. 본 논문에서는 서브네트워크의 분할에 있어서의 특성을 분석하고, 서브네트워크의 크기와 그에 따른 자동복구 방법의 성능을 비교하고 분석한다. 링크와 노드장애가 발생하는 환경에 대한 시뮬레이션 결과에서 제안된 세그먼트 자동복구 방법이 가장 짧은 복구 시간을 나타내었다. 특히 세그먼트 자동복구의 개념을 사용하는 SLSP(Shortest Leap Shared Protection) 방법과 비교했을 경우 복구 시간과 복구 자원 면에서 모두 우수한 성능을 나타내었다.

• Journal of Electrical Engineering and Technology
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• 제13권2호
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• pp.637-647
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• 2018

In this paper, we propose a method to search candidates of network reconfiguration to restore distribution system with distributed energy resources using a level-based tree search algorithm. First, we introduce a method of expressing distribution network with distributed energy resources for fault restoration, and to represent the distribution network into a simplified graph. Second, we explain the tree search algorithm, and introduce a method of performing the tree search on the basis of search levels, which we call a level-based tree search in this paper. Then, we propose a candidate search method for fault restoration, and explain it using an example. Finally, we verify the proposed method using computer simulations.

• 대한전자공학회논문지TC
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• 제41권5호
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• pp.53-61
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• 2004

본 논문에서는 GMPLS 네트워크의 생존성을 높이기 위해 서브네트워크를 이용한 2가지 유형의 동적 복구 방안들을 제안하고, 그의 특성을 분석한다. 제안한 방식은 전체 GMPLS 네트워크를 몇 개의 서브네트워크로 나누고, 장애가 발생된 장소에 따라 복구 방식과 보호 방식을 혼합하여 적용한 방식과 GMPLS 네트워크를 주 서브네트워크와 보조 서브네트워크로 나누고 장애가 발생한 지점에 따라 서브네트워크 별로 복구 방식을 적용하는 방안이다. 두 방식의 성능을 시뮬레이션을 통해 네트워크자원 이용 율과 복구 성공률, 평균 복구 시간을 분석하고, 기존 방식과 비교 분석하였다. 그 결과 기존 l＋l, 1:1, 1:N의 보호 방식보다는 두 방식 모두 자원이용 효율은 증가하였다. 복구 성공률과 평균 복구 시간은 기존의 경로 복구 방식에 비해, 단일 장애에 대해서는 우수하지만 다중 장애에 대해서는 약간 열세임을 확인하였다. 그러나 단일 경로에서 다중 링크 장애가 발생할 확률은 낮으므로, 실제 적용 시 문제가 되지 않는다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 A
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• pp.3-5
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• 2001

When a fault occurs on distribution network. blackout region may happen, then it should be restored as fast as possible to minimize interruption of electric service. In this paper. A near optimal method to restore distribution network is proposed. For an optimal restoration, the number or switching operations must be minimized. The proposed method generates a general restoration plan for any distribution network fault and designed to reduce switching operations considering available load transfers. In this method overall process time can reduce with heuristic rules, which make a reduction of search space before restoration process. To achieve a near optimal solution, multiple load transfer algorithm is proposed too.

• 전기학회논문지
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• 제58권9호
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• pp.1674-1680
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• 2009

This paper proposes an autonomous fault determination, fault zone isolation and fault restoration strategy based on the ethernet communication as a new attempt to solve the problem the of the existing central control method. In proposed method, The FRTU(Feeder Remote Terminal Unit)s on the feeder determines autonomously where the faulted zone is by exchanging the voltage and current information with neighbor FRTUs based on the network communication, and then separates the faulted zone in an nil-voltage status to make the protective device to reclose successively. In particular, the minimization of outage time and relational load balancing is archived by each interconnection switch which determines autonomously the load zone to be allocated among those zones after the sound outage zones was separated individually. Finally, to show effectiveness of the proposed fault restoration strategy, the several fault cases are simulated for the test distribution system, and the load balancing index of the proposed solution is compared with all of feasible solutions.

• 전기학회논문지
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• 제58권11호
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• pp.2107-2114
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• 2009

It is impossible to take the instant action in the distribution system When fault occures in a substation because operation of the substation and the distribution system are separated. However the power system automation has been studying about unity operation and co-operation between SCADA and DAS(Distribution Automation System). In this paper proposes a new algorithm of efficiency restoration using a outage load switching to a healthy MTR a fault occurrence at a MTR in united system between DAS and SCADA. In addtion, proposed algorithm includes a outage restoration method which keeps MTR optimal capacity with reorganization of distribution network in case it can not restore outage state loads caused by shortage of healthy MTR remain capacity. In case that proposed sequence still can not complete restoration, this paper suggests a efficiency outage restoration with objective function included priority in outage loads. In the case studies, the proposed algorithm have been verified in 2 MTR and 3 MTR substation

• International Journal of Contents
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• 제5권2호
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• pp.43-52
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• 2009

The article first presents a broad overview of the design and management for survivable network. We review the concept of network survivability, various protection and restoration schemes. Also we introduce design architectures of Quantitative model and a Survivable Ad hoc and Mesh Network Architecture. In the other side of study like these(traditional engineering approach), there is the concept of the survivable network systems based on an immune approach. There is one sample of the dynamic multi-routing algorithms in this paper.

• 전기학회논문지P
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• 제65권1호
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• pp.18-24
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• 2016

In order to service restoration and enhance power system reliability, a number of impedance based fault location algorithms have been developed for fault locating in a transmission line. This paper presents an advanced impedance-based fault location algorithms in a two-ended sources transmission line to reduce the DC offset error effects. This fault location algorithm uses of the GPS time synchronized voltage and current signals from the local and remote terminal. The algorithm uses an advanced DC offset removal filter. A series of test results using ATPdraw simulation data show the performance effectiveness of the proposed algorithm. The proposed algorithm is valid for a two-end sources transmission network.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 제40회 하계학술대회
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• pp.159_160
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• 2009

In this paper proposes a new algorithm of efficiency outage restoration using a outage load switching to a healthy MTR a fault occurrence at a MTR. In addtion, proposed algorithm includes a outage restoration method which keeps MTR optimal capacity with reorganization of distribution network in case it can not restore outage state loads caused by shortage of healthy MTR remain capacity. In case that proposed sequence still can not complete restoration, this paper suggests a efficiency outage restoration with objective function included priority in outage loads.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 추계학술대회 논문집 학회본부A
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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.