• Title, Summary, Keyword: Energy storage system (ESS)

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Sizing and Economic Analysis of Battery Energy Storage System for Peak Shaving of High-Speed Railway Substations (고속철도 변전소 피크부하 저감용 ESS 용량 산정 및 경제성 분석)

  • Kim, Seul-Ki;Kim, Jong-Yul;Cho, Kyeong-Hee;Byun, Gil-Sung
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.63 no.1
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    • pp.27-34
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    • 2014
  • The paper proposed a sizing method of an energy storage system(ESS) for peak shaving of high-speed railway substations based on load profile patterns of substations. A lithium based battery ESS was selected since it can produce high-power at high speed that peak shaving requires, and also takes up a relatively smaller space for installation. Adequate size of the ESS, minimum capacity which can technically meet a peak shaving target, was determined by collectively considering load patterns of a target substation, characteristics of the ESS to be installed, and optimal scheduling of the ESS. In case study, a local substation was considered to demonstrate the proposed sizing method. Also economic analysis with the determined size of ESS was performed to calculate electricity cost savings of the peak shaving ESS, and to offer pay-back period and return on investment.

A Study on the Method to Evaluate Minimum Capacity of Energy Storage System(ESS) for Micro Grid(MG) Design (확률론적 방법론을 이용한 마이크로그리드(MG)의 에너지 저장장치(ESS) 최소 필요용량 및 투자시점 결정방법)

  • Lee, Jae-Gul;Shin, Jeong-Hoon;Nam, Su-Chul;Baek, Sung-Muk
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.24 no.8
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    • pp.40-47
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    • 2010
  • In this paper, we propose a probability method to determine minimum capacity of energy storage system(ESS) for Micro Grid(MG). Because of high capital cost of ESS, it's very important to determine optimal capacity of ESS and for stable operation of MG and we should determine minimum capacity of ESS. The proposed method has abilities to consider forced outage rate of generators and intermittent of non-dispatchable generators and minimum capacity make MG keep energy balancing by oneself.

Analysis on Required Capacity of Energy Storage System to Mitigate Wind Power Fluctuation (풍력발전기의 출력 안정화를 위한 에너지 저장장치 용량 산정 사례연구)

  • Kang, Min Hyeok;Chae, Sang Heon;Ahn, Jin Hong;Kim, Eel-Hwan
    • Journal of the Korean Solar Energy Society
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    • v.37 no.6
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    • pp.59-68
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    • 2017
  • In accordance with the policy of local government, the large scale of wind farms have been installed in Jeju power system. However, The intermittent characteristics of wind power output may cause grid voltage and frequency variation, especially in weak power system. One of the solution to solve this problem is installation of Energy storage system (ESS). In this case, the ESS will regulate the active power generated from wind farm to mitigate fluctuation. Actually, the local government of Jeju island constructed ESS connected to Hangwon wind turbine in 2016. From this point, this paper analyzes requirement capacity of ESS to mitigate wind power fluctuation based on measured data from Hangwon wind turbine and ESS. The simulation results will be carried out by Matlab program.

Feasibility Study for Application of Frequency Regulation ESS in Cuba: Technological Effects on Improving Frequency Compensation (쿠바 주파수조정 ESS 운영 전략 검토: 주파수 보상 효과 분석)

  • Kim, Soo-Yeol;Lee, Seong-eun;Kim, Jin-tae
    • KEPCO Journal on Electric Power and Energy
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    • v.6 no.2
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    • pp.123-127
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    • 2020
  • KEPCO has installed Frequency Regulation ESS (FR ESS) of 376 MW since 2015. Frequency Regulation is ancillary service to support stabilizing system frequency, which is divided into governor free and automatic generation control. KEPCO operates FR ESS as governor free application and leads FR ESS market with capability of diverse demonstration and operation experiences. To expand FR ESS role during transient states of power system, KEPCO has extended operating time of charging and discharging. KEPCO has also changed speed droop lower than before to improve contribution on frequency compensation, and acquired much experiences of differentiating bad cells from others. Based on these technologies and know-hows, KEPCO Research Institutes received request of feasibility study and technical cooperation for overseas FR ESS business. This paper suggests the simple and practical method for making technological feasibility study of FR ESS.

Intelligent Energy Harvesting Power Management and Advanced Energy Storage System (지능형 에너지 저장시스템과 ESS 개발을 위한 소재 및 공정 기술)

  • Heo, Kwan-Jun;Kim, Sung-Jin
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.27 no.7
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    • pp.417-427
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    • 2014
  • Renewable energy sources such as solar, wind and hydro provides utilizing renewable power and reduce the using fossil fuels. On the other hand, it is too critical to apply power system due to the intermittent nature of renewable energy sources, the continuous fluctuations of the power load, and the storage with high energy density. Energy storage system, including pumped-hydroelectric energy storage, compressed-air energy storage, superconducting magnetic energy storage, and electrochemical devices like batteries, supercapacitors and others have shown that solve some of the challenges. In this paper, we review the current state of applications of energy storage systems, and atomic layer deposition technology, graphene materials on the energy storage systems and processes.

Effects of hospital environment using health belief model in environmental management on preventive behaviors through responsiveness and health value (환경경영에서 건강신념모델을 이용한 병원환경이 대응성과 건강가치성을 통해 예방행동에 미치는 영향)

  • Jang, Googhyun;Hwang, Changyu;Song, Youngwoo
    • Journal of the Korea Society of Digital Industry and Information Management
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    • v.12 no.3
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    • pp.231-257
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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.

A Study on the Production of Hydrogen Energy According to Installed Capacity of Energy Storage System on Campus (대학 캠퍼스 내 에너지저장장치 연계에 따른 잉여 수소에너지 생산에 관한 연구)

  • Choi, Bong-Gi;Jun, Jong-Hyun;Kim, Sung-Yul
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.67 no.2
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    • pp.94-99
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    • 2018
  • Depending on how the energy storage system(ESS) is used in a system that can construct a microgrid by using an independent power source such as campus, surplus power can be generated that can not be charged to the ESS. For example, assuming that heat is supplied by a fuel cell in the case of a system in which thermal self-sustaining is prioritized, the fuel cell capacity required differs depending on the heat load. The amount of surplus power that can not be stored in the ESS will appear differently depending on the load operation of the fuel cell for each cycle. This power is hydrogenated through a water electrolytic device to present the amount of hydrogen energy that can be operated for each cycle. Therefore, this paper propose the possibility of utilizing University campus as a hydrogen station.

Real-time Optimal Operation Planning of Isolated Microgrid Considering SOC balance of ESS

  • Lee, Yoon Cheol;Shim, Ji Yeon;Kim, Jeongmin;Ryu, Kwang Ryel
    • Journal of the Korea Society of Computer and Information
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    • v.23 no.10
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    • pp.57-63
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    • 2018
  • The operating system for an isolated microgrid, which is completely disconnected from the central power system, aims at preventing blackouts and minimizing power generation costs of diesel generators through efficient operation of the energy storage system (ESS) that stores energy produced by renewable energy generators and diesel generators. In this paper, we predict the amount of renewable energy generation using the weather forecast and build an optimal diesel power generation plan using a genetic algorithm. In order to avoid inefficiency due to inaccurate prediction of renewable energy generation, our search algorithm imposes penalty on candidate diesel power generation plans that fail to maintain the SOC (state of charge) of ESS at an appropriate level. Simulation experiments show that our optimization method for maintaining an appropriate SOC balance can prevent the blackout better when compared with the previous method.

ESS Algorithm design for Renewable energy generation and Load capacity (신재생에너지 발전량 및 부하용량을 고려한 ESS 알고리즘 설계)

  • Park, Jong-Ho;Park, Min-Su;Ma, Seong-Duc;Oh, Joon-Seok;Jeong, Ui-Young;Kim, Jae-Eon
    • Proceedings of the KIEE Conference
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    • pp.615-616
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    • 2015
  • 신재생에너지인 태양광발전으로 발생하는 전력과 부하에서 소비되는 소비전력으로 ESS(Energy Storage System)의 한 종류인 BESS(Battery Energy Storage System)의 운영 알고리즘을 제안 및 실증하고, 그 알고리즘은 부하를 평준화 시켜 계통에 걸리는 부담을 줄이고, 비용을 최소화 하며, 경제적으로 뛰어난 전력운영을 목표로 한다.

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An Operation Strategy of Udo Island Power System with the Introducing ESS (ESS 도입에 의한 우도 전력계통 운영방안)

  • LEE, DOHEON;Kim, Eel-Hwan;Kim, Ho Min;Oh, Sung-Bo;LEE, SEUNGMIN
    • Journal of the Korean Solar Energy Society
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    • v.35 no.3
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    • pp.57-63
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    • 2015
  • This paper presents a solution by introducing energy storage system(ESS) to solve an annual blackout due to a typhoon or electrical failure in Udo Island. This island is now receiving electrical power through undersea cables from the Jeju Island. During blackout period, ESS will supply the electricity. And it is necessary to estimate the ESS capacity and control the transient state for the operation of stable power system. For the verification of proposed method, ESS capacities have been estimated according to base load and the minimum capacity of only home appliance in Udo Island. Also, in case of restoring from the fault, the algorithm for synchronization is proposed. Finally, the simulation results by using the PSCAD/EMTDC program will show the feasibility.