• 제목, 요약, 키워드: Energy storage system (ESS)

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Field Tests of DC 1500 V Stationary Energy Storage System

  • Lee, Hanmin;Kim, Gildong;Lee, Changmu;Joung, Euijin
    • International Journal of Railway
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    • v.5 no.3
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    • pp.124-128
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    • 2012
  • The ESS(energy storage system, here after) for a DC 1500V was developed in 2009. A ESS was installed on the track of Daejeon HRT in 2010. The advantage of the ESS is that it can save the energy and plus stable the catenary voltage. This paper presents the energy saved by the ESS in Daedong substation. When the ESS is on/off, the field tests are performed.

태양광/풍력 연계 기반의 ESS 경제성 분석 (Economic Feasibility of Energy Storage System connected with Solar /Wind Power Generation)

  • 이용봉;김정호
    • 에너지공학
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    • v.24 no.3
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    • pp.74-81
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    • 2015
  • 늘어나는 전력 수요와 탄소배출을 줄이기 위하여 정부는 신재생에너지 및 에너지저장장치 도입을 장려하고 있다. 정부 는 2020년까지 ESS 누적용량을 2GW로 확대할 예정이다. ESS 도입을 통하여 전력 피크를 줄일 수 있으며, 시간대별 차등요금제를 활용하여 남는 전력을 판매할 수 있다. 본 논문에서는 ESS 보급 확대에 따른 비용을 분석을 위한 모형을 제안하였으며, 2035년까지의 ESS 발전량과 발전단가를 분석하였다. 또한 ESS와 신재생에너지 연계에 따른 경제성 분석을 위하여 태양광발전 및 풍력발전 연계에 따른 사례연구를 진행하였고, ESS 보급 촉진을 위하여 정부의 추가적인 보급지원 정책이 필요함을 시사하고 있다.

효율적 전력 관리를 위한 독립형 가로등의 ESS 설계 및 구현 (Design and Implementation of an ESS for Efficient Power Management of Stand-Alone Type Street Lights)

  • 강진구
    • 디지털산업정보학회논문지
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    • v.12 no.2
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    • pp.1-6
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    • 2016
  • Several efforts to replace the use of existing fossil energy resources have already been made around the world. As a result, a new industry of renewable energy has been created, and efficient energy distribution and storage has been promoted intensively. Among the newly explored renewable energy sources, the most widely used one is solar energy generation, which has a high market potential. An energy storage system (ESS) is a system as required. In this paper, the design and implementation of an ESS for the efficient use of power in stand-alone street lights is presented. In current ESS applied to stand-alone street lights, either 12V~24V DC (from solar power) or 110V~220V AC (from commercial power) is used to recharge power in systems with lithium batteries. In this study, an ESS that can support both solar power and commercial power was designed and implemented; it can also perform emergency recharge of portable devices from solar powered street lights. This system can maximize the scalability of ESSes using lithium batteries with efficient energy conversion, with the advantage of being an eco-friendly technology. In a ripple effect, it can also be applied to smart grids, electric vehicles, and new, renewable storage markets where energy storage technology is required.

리튬이온 배터리를 이용한 에너지저장장치 시스템의 잠재수익 산출 기법 (Potential Revenue Prediction Method of ESS using Lithium-ion Battery)

  • 원일권;김도윤;장영희;추경민;홍성우;원충연
    • 전력전자학회:학술대회논문집
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    • pp.423-424
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    • 2016
  • Recently, the mass production of Energy storage system (ESS) is actively perform around world. Energy storage system is a technique that stores power to energy storage device to supply energy into grid and load at peak-load. Therefore, the efficient energy management is available by using ESS system. The life of Lithium-ion battery is varied corresponding to the power usage, especially selected depth of discharge (DOD). The lifetime of battery is the one of the most issue of the ESS system because of its stability and reliability. Therefore, lifetime management of battery and power converter of ESS module is required. In this paper, the battery lifetime management method estimating residual power and lifetime of lithium ion battery of ESS system is proposed. Also, total avenue prediction of ESS system is simulated considering the total lifetime of battery.

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Contribution of an Energy Storage System for Stabilizing a Microgrid during Islanded Operation

  • Kim, Jong-Yul;Kim, Seul-Ki;Park, June-Ho
    • Journal of Electrical Engineering and Technology
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    • v.4 no.2
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    • pp.194-200
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    • 2009
  • In this paper, the cooperative control scheme of micro sources and an ESS (Energy Storage System) during islanded operation is presented and evaluated by a simulation study. The ESS handles the frequency and voltage as a primary control. Then, the secondary regulation control returns the cur-rent power output of ESS into a pre-planned value. The simulation's results show that the proposed co-operative control scheme can regulate the frequency and voltage and reduce the consumption of the stored energy of ESS.

마이크로그리드(MG)의 설계를 위한 에너지저장장치(ESS)의 최소용량산정 기법에 관한 연구 (A Study on the Method to Evaluate Minimum Capacity of Energy Storage System(ESS) for Micro-Grid Design)

  • 이재걸;신정훈;최영도;남수철;김태균
    • 조명전기설비학회논문지
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    • v.23 no.10
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    • pp.52-58
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    • 2009
  • 본 논문에서는 마이크로그리드(Micro grid, MG)의 설계에서 필요로 되는 에너지저장장치(Energy storage system, ESS)의 최소설비용량을 산정할 수 있는 확률론적 방법론을 제시하였다. ESS기술은 아직까지 경제성 측면에서 매우 높은 설비비용이 필요로 되기 때문에 적정 설비규모를 산정하는 것과 MG의 안정적인 운영을 위해서 최소 설비용량에 대한 가이드라인의 제시가 필요로 된다. 본 논문에서 제시한 방법론은 Non-dispatchable 발전원 출력의 간헐성과 모든 발전기의 고장정지확률을 고려하여 MG가 자체적인 에너지 Self balancing을 유지할 수 있는 ESS의 최소설비용량을 산정할 수 있는 것을 특징으로 한다.

Designing Test Methods for IT-Enabled Energy Storage System to Evaluate Energy Dynamics

  • Kim, Young Gon;Kim, Dong Hoon;Lee, Eun-Kyu
    • Journal of Information Processing Systems
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    • v.13 no.6
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    • pp.1487-1495
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    • 2017
  • With increasing interests in renewables, more consumers are installing an energy storage system (ESS) in their backyards, and thus, the ESS will play a critical role in the emerging smart grid. Due to mechanical properties, however its operational dynamics must be well understood before connecting the ESS to the smart grid (and eventually to an IT system). To this end, we investigate charging and discharging processes in detail. This paper, then, proposes methods for four type tests (state of charge test, conversion efficiency test, response time test, and ramp rate test) that can assess the dynamics of the ESS. The proposed methods can capture accurate delay values of mechanical processes in the ESS, and it is expected for those values to help design real-time communication systems in the smart grid involving the ESS.

태양광/풍력 연계 기반의 에너지저장장치 설비계획 모델링 (Energy Storage System Model for Facility Plan Connected with Solar and Wind Power Plant)

  • 이용봉;김정호
    • 전기전자학회논문지
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    • v.19 no.3
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    • pp.295-303
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    • 2015
  • 지구 온난화 및 탄소배출권 저감을 위한 대안으로 에너지저장장치(ESS, Energy Storage System)의 중요성을 인식하고 ESS 산업육성을 위한 보급사업 및 인센티브 정책을 추진하고 있다. 우리나라는 2020년까지 ESS 누적 용량 2GW 보급을 추진하고 있다. 이러한 보급정책과 기업들의 기술개발에 따라 시장 확대로 인한 ESS의 배터리 가격이 점차 하락할 전망이다. 본 논문에서는 ESS 기술개발에 따른 ESS 가격 하락에 따른 ESS 보급량 추정을 하였으며, 이에 따라 발생하는 비용의 경제성 분석을 실시하였다. 또한 ESS 종류에 따라 발생할 수 있는 비용 및 ESS와 풍력전원의 연계에 따른 투자비용 분석을 하였으며, ESS보급에 따라 발생할 수 있는 전력판매수익 및 신재생에너지공급인증서 판매수익에 대한 경제성 분석을 실시하였다.

풍력발전의 출력 변동 저감을 위한 ESS 최소용량 산정기법 (Method of Minimizing ESS Capacity for Mitigating the Fluctuation of Wind Power Generation System)

  • 김재홍;강명석;김일환
    • 한국태양에너지학회 논문집
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    • v.31 no.5
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    • pp.119-125
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    • 2011
  • In this paper, we have studied about minimizing the Energy Storage System (ESS) capacity for mitigating the fluctuation of Wind Turbine Generation System (WTGS) by using Electric Double Layer Capacitor (EDLC) and Battery Energy Storage System (BESS). In this case, they have some different characteristics: The EDLC has the ability of generating the output power at high frequency. Thus, it is able to reduce the fluctuation of WTGS in spite of high cost. The BESS, by using Li-Ion battery, takes the advantage of high energy density, however it is limited to use at low frequency response. To verify the effectiveness of the proposed method, simulations are carried out with the actual data of 2MW WTGS in case of worst fluctuation of WTGS is happened. By comparing simulation results, this method shows the excellent performance. Therefore, it is very useful for understanding and minimizing the ESS capacity for mitigating the fluctuation of WTGS.

에너지 저장 시스템 (ESS)용 배터리의 운전조건에 따른 성능 저하 및 태양광 연계형 ESS 모니터링 연구 (Performance Degradation of a Battery in an Energy Storage System (ESS) under Various Operating Conditions and Monitoring Study of ESS Connected with Photovoltaic)

  • 정윤이;정한주;정연기;이재영;이홍기
    • 한국수소및신에너지학회논문집
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    • v.25 no.3
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    • pp.311-318
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    • 2014
  • Performance degradation of a battery in 20 kWh energy storage system (ESS) under various operating conditions was studied. And energy saving of the ESS was also monitored by connecting with 20 kW photovoltaic (PV). PV-connected ESS saved 5~7% of energy consumption in 2013 compared to that without such system in 2012. As charge-discharge cycle increased, capacity decreased and the performance degradation was glaringly obvious after 40 cycles. And as charge and discharge rate increased, the performance degradation was more serious. After 50 charge-discharge cycles, a lot of degraded product was deposited on the surface of anode and cathode electrodes, and the cathode side was more contaminated. Therefore, in order to maintain the cell performance, it was more important to protect the degradation of the cathode side.