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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.
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.
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.
송영원(Young-Won Song),이계병(Kyebyung Lee),박창현(Chang-Hyun Park) 대한전기학회 2013 전기학회논문지 Vol.62 No.11
This paper presents a method for determining the optimal placement of distributed generation units considering voltage sags. In general, the existing methods for distributed generation placement do not consider power quality problems such as voltage sags. In this paper, a novel method based on both genetic algorithm and voltage sag assessment is proposed for determining the placement of distributed generation unit. In the proposed method, the optimal placement is determined to minimize voltage sag effects and system losses.
김성현(Sunghyun Kim),이계병(Kyebyung Lee),손광명(Kwang M. Son) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
This paper presents effective operation methods for the battery energy storage applied to a microgrid. In an islanded microgrid, energy storage is needed to satisfy an energy balance between generation and consumption. The microgrid can be classified according to the ratio of the sensitive load and renewable energy source in the microgrid. For effective management of the battery energy storage, based on the classified microgrid, suitable operation methods for the battery energy storage system are provided from well-known battery applications.