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Kyebyung Lee,Minhan Yoon,Chang-Hyun Park,Gilsoo Jang 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.2
This paper proposes a method to utilize an energy storage system (ESS) based on the assessment of an area of severity (AOS) to voltage sag. The AOS is defined as a set of the fault positions that can cause voltage sags at many buses simultaneously. The assessment of AOS helps to determine an optimal location of ESS installation to minimize the expected sag frequency (ESF) at concerned buses. The ESS has the ability not only to play traditionally known roles but also to mitigate voltage sag impact on renewable energy sources (RES) in the islanded microgrid. Accordingly, using the proposed method the ESS has additional features to prevent the operation failure of RESs and improve the stability of the microgrid. In order to verify the presented method, a case study was conducted on the sample microgrid system that is modified from an IEEE 57-bus system.
이계병(Kyebyung Lee),한종훈(Jong-Hoon Han),장길수(Gilsoo Jang),박창현(Chang-Hyun Park) 대한전기학회 2015 전기학회논문지 Vol.64 No.1
This paper presents a method to select optimal device for mitigating voltage sags. The method is based on economic evaluation and voltage sag assessment involving sag duration as well as magnitude. The economic evaluation is performed by using the operation cost and economic benefit of the mitigation devices. The optimal device can be determined from the values of NPV (net present value) which is widely accepted in cost-benefit analysis. The proposed method can help sensitive customers to select optimal mitigation device. In this paper, the case study considering two sensitive customers was performed by using the proposed method.
신재생에너지가 설치된 수용가의 마이크로그리드 구현을 위한 그리드-인터페이스 에너지 저장장치에 관한 연구
이계병(Kyebyung Lee),손광명(Kwang-Myoung Son) 한국조명·전기설비학회 2013 조명·전기설비학회논문지 Vol.27 No.5
This paper introduces a grid-interactive storage system to operate the customers without voltage source inverters as a microgrid. The proposed storage system does not require any modification of the control scheme of the inverters existing within the customers. Novel control scheme of the grid-interfacing storage system according to its new structure ensures the seamless transition between the grid-connected and islanded operation of the microgrid.
Lee, Kyebyung,Yoon, Minhan,Park, Chang-Hyun,Jang, Gilsoo The Korean Institute of Electrical Engineers 2017 Journal of Electrical Engineering & Technology Vol.12 No.2
This paper proposes a method to utilize an energy storage system (ESS) based on the assessment of an area of severity (AOS) to voltage sag. The AOS is defined as a set of the fault positions that can cause voltage sags at many buses simultaneously. The assessment of AOS helps to determine an optimal location of ESS installation to minimize the expected sag frequency (ESF) at concerned buses. The ESS has the ability not only to play traditionally known roles but also to mitigate voltage sag impact on renewable energy sources (RES) in the islanded microgrid. Accordingly, using the proposed method the ESS has additional features to prevent the operation failure of RESs and improve the stability of the microgrid. In order to verify the presented method, a case study was conducted on the sample microgrid system that is modified from an IEEE 57-bus system.
이계병(Kyebyung Lee),손광명(Kwang M. Son),장길수(Gilsoo Jang) 대한전기학회 2010 전기학회논문지 Vol.59 No.2
This paper deals with implementation of the laboratory-scale microgrid using energy storage system. Also, this paper develops a simulation model of the microgrid with same parameters on the laboratory-scale microgrid using PSCAD/EMTDC. The experimental results show good agreement with the simulation results. This shows the validity of the simulation model. A valve regulated lead acid (VRLA) battery is used to store energy. Energy storage system with fast response is able to maintain power quality of sensitive load within the microgrid.
Watt-Hour Metering Characteristics at Scott Transformer in AC Electric Railway Systems
Hansang Lee,Kyebyung Lee,Kisuk Kim,Yong-Up Park,Young-Soo Jeon,Sung-Kwan Joo,Gilsoo Jang,Chang-Hyun Park 대한전기학회 2018 Journal of Electrical Engineering & Technology Vol.13 No.3
Owing to the consistent increase in accurate analysis issue for energy consumption of the AC electric railway systems, there is controversy about the adequacy of the present watt-hour metering configuration. Due to the unusual load characteristics and facilities, the discussions have not been active. Therefore, in order to achieve more accurate watt-hour metering for AC electric railway system, this paper proposes numerical formulas for watt-hour metering that reflects the highly-varying characteristics of the railway load and the structural characteristics of the Scott transformer. The proposed formulas have been verified by comparison with site-measured data, and a more suitable metering configuration for AC railway system has been proposed.