• Title, Summary, Keyword: Energy storage system

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Development of Energy Storage System for Urban Transit System (도시철도용 에너지저장시스템 개발에 관한 연구)

  • Lee, Hanmin;Kim, Gildong;Joung, Euijin
    • 한국신재생에너지학회:학술대회논문집
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    • pp.162.2-162.2
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    • 2010
  • The energy storage system is considered to be one of the useful devices for energy storing and recycling. the energy storage system can save energy cost and stabilize the system voltage. This paper presents the development of two energy storage systems. One is 750V system for light rail system. the other is 1500V system for heavy rail system.

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Calculation of Appropriate Subsidies for Energy Storage System to Improve Power Self-sufficiency Consider Microgrid Operation (마이크로그리드 운영에 따른 전력자립 향상을 위한 에너지저장장치의 적정보조금 산정)

  • Choi, Yeon-Ju;Kim, Sung-Yul
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.66 no.3
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    • pp.486-492
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    • 2017
  • In recent years, renewable energy sources have been mentioned as solution to environmental regulation and energy supply-demand. Energy storage systems are needed to mitigate the intermittent output characteristics of renewable energy sources and to operate micro grid efficiently using renewable energy generation systems. However, despite the necessity of energy storage system, this cannot secure the economical efficiency of the energy storage system by high initial cost. In this paper, a micro grid is constructed to supply electric power to industrial customers by using solar power generation system and energy storage system among renewable energy generation power sources and operated to improve energy independence. In the case study, we use photovoltaic system which is representative renewable energy generation system. Unlike conventional photovoltaic system, this system uses floating photovoltaic system with the advantage of having high output and no land area limitations. It is operated for the purpose of improving energy independence in the micro grid. In order to secure economical efficiency, the energy storage system operates a micro grid with a minimum capacity. Finally, this paper calculates the appropriate subsidy for the energy storage capacity.

A Study on the Efficiency of Energy Storage System Applied to the Power Traction System of DC Electric Railway (직류전기철도에서 운행시격에 따른 에너지저장장치의 효율에 관한 연구)

  • Kim, Sung-Dae;Choi, Kyu-Hyoung
    • Proceedings of the KSR Conference
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    • pp.754-760
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    • 2011
  • In the DC traction system, a large load current of electric railcar leads to a voltage drop when a vehicle starts, and the regenerative power generated by brake system increases the catenary voltage. To minimize the voltage fluctuation during the train operation and make use of the regenerative power, several types of energy storage systems are being studied. The energy storage system that is being recently introduced consists of the supercapacitors for energy storage and the bi-direction DC/DC converter for charge/discharge control. The efficiency of the energy storage system depends on the train operation pattern. In this paper, the operation efficiency of the energy storage system was quantitatively analyzed via simulation study taking consideration of the train operation patterns. The simulation was conducted changing the headway of trains with the energy storage system that uses the bi-direction DC/DC converter and supercapacitor. The simulation results showed that the operation efficiency of the energy storage system increases as the headway increase.

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Classification and function of the Storage System in the Thermal Energy Supply System (축열시스템의 종류 및 열에너지 공급시스템에서의 역할)

  • Lee, Dong-Won;Cho, Soo;Jang, Cheol-Yong
    • 한국태양에너지학회:학술대회논문집
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    • pp.141-146
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    • 2008
  • For the efficient use of thermal energy and its related equipments, optimal energy in view of quality and quantity should be timely provided. The core of thermal energy storage technology deals with an energy efficiency for effective energy storage and supply. The relative importance of thermal energy storage technology has been underestimated so far, and the specific projects on this filed have been performed intermittently. For the efficient and systematic approach of the energy supply system projects on thermal energy storage technology, we conduct the survey on the current status of this field. Firstly, classify into the thermal energy storage and describing the recent research for each system. The necessity and importance of thermal energy storage technology is identified through this study. It reveals that the thermal energy storage is the mandatory technology to solve the difference of supply and demand in thermal loads. It would greatly contribute to the combined heat and power(CHP) system. The urgent technologies for the commercial value and the core technologies for the CHP system are classified with this study.

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Design of a renewable energy system with battery and power-to-methanol unit

  • Andika, Riezqa;Kim, Young;Yun, Choa Mun;Yoon, Seok Ho;Lee, Moonyong
    • The Korean Journal of Chemical Engineering
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    • v.36 no.1
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    • pp.12-20
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    • 2019
  • An energy storage system consisting of a battery and a power-to-methanol (PtM) unit was investigated to develop an energy storage system for renewable energy systems. A nonlinear programming model was established to optimize the energy storage system. The optimal installation capacities of the battery and power-to-methanol units were determined to minimize the cost of the energy system. The cost from a renewable energy system was assessed for four configurations, with or without energy storage units, of the battery and the power-to-methanol unit. The proposed model was applied to the modified electricity supply and demand based on published data. The results show that value-adding units, such as PtM, need be included to build a stable renewable energy system. This work will significantly contribute to the advancement of electricity supply and demand management and to the establishment of a nationwide policy for renewable energy storage.

Key Technologies of Supercapacitor Energy Storage System of IP Transmitter

  • Zeng, Zhihui;Wang, Xiaowei;Wei, Yanfang;Hu, Zhiguo;Yu, Yangxiao;Zhang, Zhigang
    • Journal of Power Electronics
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    • v.19 no.1
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    • pp.316-331
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    • 2019
  • A practical application of a supercapacitor energy storage system in a polarization instrument is proposed on the basis of the energy storage requirements of an induced polarization (IP) transmitter for geophysical exploration. We focused on the energy storage system of a supercapacitor, the topology of the power converter, and the system control strategy as key technologies, and we performed theoretical research and experimental tests on the system and developed an experimental platform. The experiments validated the theoretical research on the key technologies of the supercapacitor energy storage system and demonstrated the effectiveness of the innovation. Results showed that the storage system is efficient and satisfies the energy storage needs of the IP transmitter.

Development of Flywheel Energy Storage System (플라이휠에 의한 에너지 저장 장치 개발)

  • Kim, W.H.;Kim, J.S.;Rim, G.H.
    • Proceedings of the KIEE Conference
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    • pp.1924-1926
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    • 1997
  • With the development of power electronics, many new energy storage systems such as the superconducting magnetic energy storage, the flywheel energy storage, and the capacitive energy storage, etc. are being intensively studied recently in order to replace battery in some special applications, Among these innovative energy storage systems, the flywheel system exhibits some unique features such as high power density, easy maintenance and longer lifetime. This paper introduces the novel flywheel energy storage system. Operation and features of the system are illustrated and verified on a 6kVA, 20kHz IPM based experimental circuit for O/A application. The Halbach Array Motor is selected of the design of the three phase motor/generator for the flywheel energy storage system.

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A Study on Capacity Design of Energy Storage System for Urban Transit System (도시철도시스템용 에너지저장시스템 용량설계에 관한 연구)

  • Lee, Han-Min;Kim, Gil-Dong;Lee, Chang-Mu
    • 한국신재생에너지학회:학술대회논문집
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    • pp.697-700
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    • 2007
  • Six thousands of vehicles are operated on Korean urban transit system. 95% of them have regeneration system. Especially, the VVVF-Inverter vehicle has a merit of the highest regeneration rate. Therefore, the energy storage system is needed to be developed to use regeneration energy when the vehicle is braking. Therefore, Measuring regeneration energy in the substation need to know how much regeneration energy occurs, how much capacity of energy storage system is needed. After measuring regeneration energy, we design the capacity of energy storage system.

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Review on Thermal Storage Media for Cavern Thermal Energy Storage (지하공동 열에너지 저장을 위한 축열 매질의 기술 현황 검토)

  • Park, Jung-Wook;Park, Do-Hyun;Choi, Byung-Hee;Han, Kong-Chang
    • Tunnel and Underground Space
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    • v.22 no.4
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    • pp.243-256
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    • 2012
  • Developing efficient and reliable energy storage system is as important as exploring new energy resources. Energy storage system can balance the periodic and quantitative mismatch between energy supply and energy demand and increase the energy efficiency. Industrial waster heat and renewable energy such as solar energy can be stored by the thermal energy storage (TES) system at high and low temperatures. TES system using underground rock carven is considered as an attractive alternative for large-scale storage, because of low thermal conductivity and chemical safety of surrounding rock mass. In this report, the development of available thermal energy storage methods and the characteristics of storage media were introduced. Based on some successful applications of cavern storage and high-temperature storage reported in the literature, the applicabilities and practicabilities of storage media and technologies for large-scale cavern thermal energy storage (CTES) were reviewed.

The Study on Prediction of Hot Water Extraction in a Thermal Energy Storage System (축열시스템의 온수이용 예측에 관한 연구)

  • Cho, W.;Pak, E.T.
    • Solar Energy
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    • v.18 no.3
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    • pp.71-80
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    • 1998
  • In thermal energy storage system, energy collected from many types of heat source is stored in a storage tank and then supply to load for demand. Lately, practical use of thermal energy storage system and attention to essential use of energy have been increased. From this point of view, especially, a study about the energy extraction process from a storage tank is necessary. So in this study, useful rate of hot water and hot water extraction efficiency was analysed respect to dynamic and geometric parameters dominating the hot water extraction process.

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