• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.20 no.2
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• pp.277-282
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• 2020

The construction of medium-and large-sized microgrid systems by unit area, which is being promoted worldwide, is being developed and expanded in the form of efficient operation of electric grids and independent operation in preparation for power emergencies. Therefore, for the development of the domestic electricity industry, it is urgent to analyze the current status and technology of relevant international standardization, and to make international standardization of domestic standard (draft) on the matters that need to be enacted and newly established. Campus microgrid implements smart grid element technologies such as Integrated Energy Management System(EMS), Distributed Power(DG), Energy Storage System(ESS), Demand Response(DR), and Electric Vehicle(EV) in a university campus. As a system that reduces energy use and improves energy use efficiency and energy independence, standardization is established to secure interoperability and reliability of such systems.

• KEPCO Journal on Electric Power and Energy
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• v.1 no.1
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• pp.33-38
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• 2015

Energy storage systems (ESSs) have been utilized widely in the world to optimize the power operation system and to improve the power quality. As lithium secondary batteries are the main power supplier for ESSs, it is very important to predict its cycle and power degradation behavior. In particular, the power, one of the hardest electrochemical properties to measure, needs lots of resources such as time and facilities. Due to these difficulties, computer modelling of lithium secondary batteries is applied to predict the DC-IR and power value during charging and discharging as a function of state of charge (SOC) by using pulse-based measurement methods. Moreover, based on the hybrid pulse power characteristics (HPPC) and J-Pulse (JEVS D 713, Japan Electric Vehicle Association Standards) methods, their electrochemical properties are also compared and discussed.

• Journal of the Korean Society of Industry Convergence
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• v.25 no.2_2
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• pp.209-218
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• 2022

The purpose of this study is to analyze an economic assessment of PV-ESS systems based on the power generation performance data of solar power (PV) operating in domestic area, and to calculate the optimal capacity of the energy storage system. In this study, PVs in Gyeonggi-do, Jeollabuk-do, and Gyeongsangbuk-do were targeted, and PVs in this area were assumed to be installed on a general site, and the research was conducted by applying weights based on the facility's capacity. All the analysis was conducted using the actual amount of KPX transactions of PVs in 2019. In order to calculate the optimal capacity of PCS and BESS according to GHI, PV with a minimum/maximum/central value was selected by comparing the solar radiation before the horizontal plane between three years (2017-2019) of the location where PV was installed. As a result of the analysis, in Gyeonggi-do, if the REC weight decreases to 3.4 when there is no change in the cost of installing BESS and PCS, it is more economical to link BESS than PV alone operation of PV. In Jeollabuk-do, it was analyzed that if the REC weight was reduced to 3.6, it was more likely to link BESS than PV operated alone. In Gyeongsangbuk-do, it was analyzed that if the REC weight was reduced to 3.4, it was more likely to link BESS than PV operated alone.

• KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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• v.28 no.2
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• pp.143-149
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• 2022

PCS needs to freely switch AC and DC to connect the battery, external AC loads and renewable energy in both directions for energy efficiency. Whenever converting happens, power loss inevitably occurs. Minimization of the power loss to save electricity and convert it for usage is a very critical function in PCS. PCS plays an important role in the ESS(Energy Storage System) but the importance of stabilizing semiconductors on PCB(Printed Circuit Board) should be empathized with a risk of failure such as a fire explosion. In this study, the temperature variation inside PCS was reviewed by cooling fan on top of PCS, and the vibration characteristics of PCS were analyzed during truck transportation for reliability of the product. In most cases, a cooling fan is mounted to control the inner temperature at the upper part of the PCS and components generating the heat placed on the internal aluminum cooling plate to apply the primary cooling and the secondary cooling system with inlet fans for the external air. Results of CFD showed slightly lack of circulating capacity but simulated temperatures were durable for components. The resonance points of PCS were various due to the complexity of components. Although they were less than 40 Hz which mostly occurs breakage, it was analyzed that the vibration displacement in the resonance frequency band was very insufficient. As a result of random-vibration simulation, the lower part was analyzed as the stress-concentrated point but no breakage was shown. The steel sheet could be stable for now, but for long-term domestic transportation, structural coupling may occur due to accumulation of fatigue strength. After the test completed, output voltage of the product had lost so that extra packaging such as bubble wrap should be considered.

• Proceedings of the IEEK Conference
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• 1998.10a
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• pp.221-224
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• 1998

Software release over the network is the most efficacious way of software update. Software release of electronic switching system, considering its environments, is the typical case that is in need of adopting the method. The media of transferring software and data of TDX-10A electronic switching system are magnetic tapes containing them, so the MT must be delivered between remotely placed office and package generation system. SMART-10A system provides the file tranfer on the data network between TDX-10A and the package generation system and ability of remote application of new software. This paper shows the implementation of file transfer between TDX-10A and computer system connected by data networks, status handling for duplicated system, and monitor process design with IPC on UNIX system.

• Proceedings of the KIPE Conference
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• 2012.07a
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• pp.107-108
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• 2012

본 논문은 당사에서 개발한 800kW Energy Storage System(ESS)의 실증 운전에 관한 내용이다. Battery, PCS(Power Conditioning System), EMS(Energy Management System)로 구성되는 ESS는 평활화, 정출력 제어와 같은 다양한 운전모드의 실현으로 풍력, 태양광과 같은 신재생 에너지가 연계된 계통의 출력 안정화에 크게 기여한다. 본 논문은 Smart Renewable 국책과제로 진행된 800kW 에너지 저장 시스템의 실증운전 결과에 대해 중점적으로 기술하였다.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.519-520
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• 2015

본 논문에서는 최적화를 적용하여 독립형 마이크로그리드 내에서 신재생 발전원의 설치 비율을 산정한다. 계통과 독립되어 있는 마이크로그리드에서의 발전원을 신재생 에너지원인 풍력 및 태양광, 그리고 에너지저장장치(Energy Storage System, ESS)만으로 가정하여 마이크로그리드의 부하규모에 맞는 신재생 에너지 발전원의 비율을 제시한다.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.607-608
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• 2015

본 논문에서는 산업용 및 건물용 수용가에 에너지저장장치(이하 'ESS')를 설치하여 운영 사례 결과를 나타냈다. 산업용 수용가는 리튬(Lithium) 기반 1MW/500kWh를, 건물용 수용가는 나트륨-니켈(NaNi) 기반 500kW/1MWh를 각각 설치하여 전기요금별, 배터리 특성별, 운전 조건별로 운영 사례를 나타냈다.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2015.11a
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• pp.183-183
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• 2015

Arc in plasma processing chamber results in high current discharge marks and particles on wafers, but it is hard to identify or observe it during the proc ess. In this paper, we report the observations of plasma arc s during various plasma proc esses through a non-invasive optic al plasma monitoring system (OPMS) devised for the in-situ detec tion of abnormal discharge.

• Information and Communications Magazine
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• v.34 no.5
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• pp.61-67
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• 2017

CES(Community Energy System) 마이크로그리드 기술은 에너지 생산/공급 및 소비가 일정 지역에 구역화하여 공급하는 집단에너지사업 중 구역전기사업이 이루어지는 커뮤니티에너지공급(CES) 시설 환경을 기반으로 이루어지는 마이크로그리드 시스템 기술이다. 마이크로그리드 환경을 위하여 CES 시설 환경을 기반으로 신재생발전, ESS 등 분산자원을 추가하고, 내부 전력시스템 개선 및 신규 에너지 서비스 인프라가 추가로 구축된다. 아울러, 이를 기반으로 마이크로그리드 환경에서 제공될 수 있는 에너지 서비스를 제공한다. 본고에서는 이러한 CES 마이크로그리드 기술에 대해 기술하고 최근 이루어지고 있는 CES 마이크로그리드 기술 개발의 사례를 통해 새로운 비즈니스 모델을 찾아보고자 한다.