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Maintenance Priority Index of Overhead Transmission Lines for Reliability Centered Approach
허재행,박종근,류재근,김문겸,김담,강용철 대한전기학회 2014 Journal of Electrical Engineering & Technology Vol.9 No.4
Overhead transmission lines are crucial components in power transmission systems. Welldesignedmaintenance strategy for overhead lines is required for power utilities to minimize operatingcosts, while improving the reliability of the power system. This paper presents a maintenance priorityindex (MPI) of overhead lines for a reliability centered approach. Proposed maintenance strategy iscomposed of a state index and importance indices, taking into account a transmission condition andimportance in system reliability, respectively. The state index is used to determine the condition ofoverhead lines. On the other hand, the proposed importance indices indicate their criticality analysis intransmission system, by using a load effect index (LEI) and failure effect index (FEI). The proposedmaintenance method using the MPI has been tested on an IEEE 9-bus system, and a numerical resultdemonstrates that our strategy is more cost effective than traditional maintenance strategies
허재행(Jae-Haeng Heo),김형철(Hyungchul Kim),신승권(Seungkwon Shin),박종영(Jong-young Park),김형익(Hyeongig Kim) 대한전기학회 2016 전기학회논문지 Vol.65 No.9
To execute load curtailment efficiently for Urban Railway Load, the load patterns of the Urban Railway Load and available amount of load curtailment over the Urban Railway Load are analyzed through comparing the load to the common power loads. In addition, the current policies of the load curtailment for the Urban Railway Load are investigated and the problems of those are presented. Based on the researches, the optimal load curtailment strategies for the Urban Railway Load are proposed to minimize the consumer’s utility diminishment and the costs of the use of energies. Finally, the optimal load curtailment strategies are applied to the real Urban Railway Load, the results shows that proposed methods are efficient and cost effective while the amount of load curtailment is minimized.
송전계통의 열화 되고 있는 기기에 대한 신뢰도 기반 유지보수 계획수립
허재행(Jae-Haeng Heo),박근표(Geun-Pyo Park),운용태(Yong Tae Yoon),박종근(Jong Keun Park),이상성(Sang-Seung Lee) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
In deregulated power market, Transmission companies not only decrease their operation costs, but also take opportunities to maximize their profit. On the other hand, they should operate to meet customer needs for reliability. In this respect, they need to make the maintenance strategies considering the tradeoff between cost and reliability. This paper proposes the equipment state modeling through modified semi-Markov chain that has deterioration stages by considering characteristics of equipment. Besides, the effects of equipment failure on the system are presented in terms of a cost using the DC-Optimal Power Flow (OPF). The paper includes test the results using Genetic Algorithm (GA) on the IEEE 9-bus system. The results show the optimal maintenance strategy which minimizes operation costs.
도시철도 부하특성을 고려한 ESS의 최적 운영방안 연구
허재행(Jae-Haeng Heo),신승권(Seungkwon Shin),박종영(Jong-young Park),김형익(Hyeongig Kim) 대한전기학회 2015 전기학회논문지 Vol.64 No.10
This paper proposes the optimal operation of ESS (Energy Storage System) in the substation of urban railway in an economical point of view. Since the load patterns of urban railway have different characteristics with the general power demand pattern, the characteristics motivate us to develop the optimal operation algorithm for ESS under Korean electricity billing system. We also introduce two different ESS operation strategies for peak load shaving and electricity consumption charge minimization respectively, and formulate each scheme. Historical data from Namgwangju substation are used for economical comparison of the strategies. The results show that the proposed algorithm is the most cost-effective ESS operation scheme among the strategies and reduces around 5 percent of electric charges compared to the charge without ESS operation.
분산전원을 포함한 배전계통에서 설치비용과 유지보수 비용을 고려한 병렬 캐패시터-리액터 Bank의 최적 설치 위치 선정
허재행(Jae-Haeng Heo),류재근(Jae-Kun Lyu),이우리(Woo-Ri Lee),박종영(Jong-Young Park),박종근(Jong-Keun Park) 대한전기학회 2013 전기학회논문지 Vol.62 No.11
This paper proposes the allocation method for capacitor-reactor banks in a distribution system with dispersed generators to reduce the installation costs, the maintenance costs and minimize the loss of electrical energy. The expected lifetime and maintenance period of devices with moving parts depends on the total number of operations, which affects the replacement and maintenance period for aging equipment under a limited budget. In this paper, the expected device lifetimes and the maintenance period are included in the formulation, and the optimal operation status of the devices is determined using a genetic algorithm. The optimal numbers and locations for capacitor-reactor banks are determined based on the optimal operation status. Simulation results in a 69-bus distribution system with the dispersed generator show that the proposed technique performs better than conventional methods.
배전계통의 다양한 유지보수 기법을 적용한 신뢰도 기반 최적 유지보수 모델
허재행(Heo Jae Haeng),정하섭(Jung Ha Sub),김유창(Kim You Chang),손진만(Son Jin Man),박종근(Park Jong Keun) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
앞으로 진행되는 배전계통의 자유화 환경에서 각 배전사업자들은 고객에게 높은 신뢰수준의 전력을 값싸게 공급하려 할 것이다. 높은 수준의 신뢰수준을 유지하기 위해서 배전계통내의 component의 점검을 통하여 고장의 원인이 될 만한 것들을 찾아내고 고장이 일어나기 전에 그것을 유지보수 하여야 한다. 이 문제는 대상 component를 얼마나 자주 점검 및 보수를 해야 하는가 라는 문제가 된다. 하지만 그에 따른 비용도 소요가 될 것이다. 본 논문에서는 점검 과 보수 과정의 model을 Markov model 로 사용하였으며 대상 component의 상태에 따라서 다른 보수 기법을 적용함으로써 점검비용과 보수비용 정전비용을 최소화 하는 점검 주기를 찾았다. 또한 제안된 방법을 실제 시스템과 유사한 모의시스템에 적용하였다.
유연수요반응을 제공할 수 있는 역사 내 부하 활용 방안 연구: 도시철도 역사 사례 분석
고웅,허재행,강현구,김보경,박종영 한국철도학회 2020 한국철도학회논문집 Vol.23 No.3
This paper proposes a way to determine that the electric load in an urban railway station has the potential to provide a flexible demand response that can mitigate the variability and uncertainty of power systems. Furthermore, potential capacity and duration of demand resource in the station are estimated for an actual station. In order to analyze the demand resource for providing the flexible demand response, this research defines the characteristics of the flexible demand response so as to differentiate between the new resource and the conventional resource. In addition, reducible and irreducible demand resources are classified based on an interview with the manager of the urban railway station. The monthly proportion of reducible demand resource is analyzed utilizing annual load data; the potential capacity and duration are estimated from daily load pattern. With these analyses, we propose a method to analyze the reducible demand resource in an urban railway station to provide flexible demand response.