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

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A Study on the Estimation of REC Multiplier for ESS Introduction (ESS 부가 설치형 REC 가중치 산정에 관한 연구)

  • Kim, Kang-Won;Kim, Balho H.
    • Journal of Energy Engineering
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    • v.23 no.4
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    • pp.106-111
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    • 2014
  • In order to manage the gradual increase of electricity demand, the United States, Japan, and Europe are seeking to achieve overall change of electric power system by introducing solutions such as smart grid. Among these solutions, there are various research projects regarding the Electricity Storage System (ESS), which aims to promote the efficient usage of electricity and grid system of new and renewable energy system. Korean government revised the law by including ESS in new and renewable energy facilities to accelerate ESS deployment. Following the same direction of the government policy, this study suggests methodologies of setting REC weighted value that guarantees investment financial feasibility when new and renewable power producers install ESS.

Analysis of Surge in Distribution System and ESS due to Direct Lightning in Distribution System with ESS using EMTP (EMTP를 이용한 ESS가 연계된 배전계통에서 직격뢰 발생 시 계통 및 ESS 측의 서지 해석)

  • Seo, Hun-Chul
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.29 no.2
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    • pp.47-53
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    • 2015
  • The study concerning about the grid connection of the large-capacity energy storage system(ESS) is increasing. However, the transient study such as lightning or switching surge necessarily occurred at power system with ESS has been hardly performed. Therefore, this paper performs the analysis of lightning surge in distribution system with ESS using electromagnetic transient program(EMTP). The battery model in Matlab/Simulink is modeled by EMTP, which is the specialized software for power system transient study. Also, the bi-directional power electronics for interconnection of the battery and distribution system are modeled by EMTP. When the lightning is occurred at interconnection point of ESS, this paper simulates the existence of ESS and operation conditions of ESS and analyzes the surge in distribution system and ESS according to the various conditions.

Characteristic Analysis and Implementation of 30kW Portable Test Equipment for Performance Evaluation in Energy Storage System (30kW급 ESS용 이동형 성능평가 시험장치의 구현 및 특성분석)

  • Park, Jea-Bum;Kim, Mi-Sung;Rho, Dae-Seok
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.67 no.6
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    • pp.715-723
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    • 2018
  • The energy storage system consists of batteries, power conditioning system and energy management system. If ESS is installed and operated in the field, SAT(Site Acceptance Test) of ESS is being essentially required for the safety and performance of ESS. Furthermore, in order to more accurately and reliably validate the performance of the ESS in advanced countries, it has been required to perform not only performance testing by H/W equipments but also performance verification by S/W tool. Therefore, this paper proposes the modeling of portable test equipment in order to evaluate the performance and reliability of ESS by using the PSCAD/EMTDC S/W. And also, the prototype of 30[kW] scaled portable test equipments is implemented based on the S/W modeling. From the results of various simulations and testings such as power quality, LVRT and anti-islanding tests, it is confirmed that 30[kW] scaled portable test equipment is useful for SAT of ESS, because the simulation results of PSCAD/EMTDC are identical to them of 30[kW] test equipment at the same test conditions.

Development and Application of Operation Methods of Battery Energy Storage System for Frequency Regulation (주파수조정용 배터리 에너지저장장치 운전방법의 개발과 적용)

  • Lim, Geon-Pyo;Park, Doo-Yong
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.64 no.2
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    • pp.57-61
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    • 2015
  • Current research and development efforts and other projects for energy storage systems (ESS) have recently been gaining attention. This is due to the many applications where ESS, particularly batteries, can be used. Among these are peak shaving, frequency regulation, and stabilization of renewable energy output. KEPCO has completed the construction and demonstration of a 4-MW battery energy storage system (BESS) located in Jeju City to verify its practicability in the power grid. KEPCO Research Institute has also been developing technology for the commercialization of BESS, and has been conducting a trial run of a 52-MW ESS (28MW + 24MW of Seo-Anseong and Shin-Yongin substations) constructed in 2014 for frequency regulation. This paper discusses the development of operation methods, as well as an operation user interface, for the safe operation and monitoring of BESS used for frequency regulation in a power system. Included are operation and simulation methods for various normal and transient frequency situations that can be experienced by a power system. Also discussed are the results obtained after applying these methods to the 4-MW BESS and the 52-MW ESS, both used for frequency regulation. The technology in this paper will be applied to 500MW ESS for frequency regulation of KEPCO by 2017. It is expected that this technology helps a safe and reliable operation and control of ESS for frequency regulation through its continuous upgrade.

Lessons Learned from Energy Storage System Demonstrations for Primary Frequency Control

  • Yu, Kwang-myung;Choi, In-kyu;Woo, Joo-hee
    • KEPCO Journal on Electric Power and Energy
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    • v.4 no.2
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    • pp.107-114
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    • 2018
  • In recent years, ESS (Energy Storage System) has been widely used in various parts of a power system. Especially, due to its fast response time and high ramp rate, ESS is known to play an important role in regulating grid frequency and providing rotational inertia. As the number of installed and commercially operating ESSs increases, the reliability becomes an important issue. This paper introduces control schemes and presents its test method for grid-connected ESS for primary frequency regulation. The test method allows to verify the control operation in the individual operation mode and state. A validation of the method through actual ESS test in a electrical substation is presented in the case study section.

Utilization of Energy Storage System based on the Assessment of Area of Severity in Islanded Microgrid

  • Lee, Kyebyung;Yoon, Minhan;Park, Chang-Hyun;Jang, Gilsoo
    • Journal of Electrical Engineering and Technology
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    • v.12 no.2
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    • pp.569-575
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    • 2017
  • This paper proposes a method to utilize an energy storage system (ESS) based on the assessment of an area of severity (AOS) to voltage sag. The AOS is defined as a set of the fault positions that can cause voltage sags at many buses simultaneously. The assessment of AOS helps to determine an optimal location of ESS installation to minimize the expected sag frequency (ESF) at concerned buses. The ESS has the ability not only to play traditionally known roles but also to mitigate voltage sag impact on renewable energy sources (RES) in the islanded microgrid. Accordingly, using the proposed method the ESS has additional features to prevent the operation failure of RESs and improve the stability of the microgrid. In order to verify the presented method, a case study was conducted on the sample microgrid system that is modified from an IEEE 57-bus system.

Hybrid UPS with Energy Storage System Function (ESS 기능을 갖는 하이브리드 UPS)

  • Lim, Seung-Beom;Hong, Soon-Chan
    • The Transactions of the Korean Institute of Power Electronics
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    • v.19 no.3
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    • pp.266-275
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    • 2014
  • This paper proposes the hybrid UPS(Uninterruptible Power Supply) with ESS(Energy Storage System) function. The proposed hybrid UPS is operating in four states, which are normal state, battery state, ESS state, and bypass state. In case of peak load time or power shortage, the system is operating in ESS state in which the stored energy of the battery is used to manage the power effectively. The validity of proposed system are verified by simulations and experiments.

Development of the Control System for Fast-Responding Frequency Regulation in Power Systems using Large-Scale Energy Storage Systems

  • Lim, Geon-Pyo;Park, Chan-Wook;Labios, Remund;Yoon, Yong-Beom
    • KEPCO Journal on Electric Power and Energy
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    • v.1 no.1
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    • pp.9-13
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    • 2015
  • Energy storage systems (ESS) can be used to provide frequency regulation services in a power system to replace traditional frequency regulation power plants. Battery ESS, in particular, can provide "fast-responding frequency regulation," wherein the facility can respond immediately and accurately to the frequency regulation signal sent by the system operator. This paper presents the development and the trial run results of a frequency regulation control system that uses large-scale ESS for use in a large power system. The control system was developed initially for the 4 MW ESS demonstration facility in Jocheon Jeju Island, and was further developed for use in the 28 MW ESS facility at the Seo-Anseong substation and the 24 MW ESS facility at the Shin-Yongin substation to provide frequency regulation services within mainland Korea. The ESS facility in Seo-Anseong substation responds to a sudden drop in frequency via governor-free control, while the ESS facility in Shin-Yongin responds via automatic generator control (AGC).

Operation Plan of ESS for Increase of Acceptable Product of Renewable Energy to Power System (재생에너지의 전력계통 수용 증대를 위한 ESS 운영방안)

  • Kim, Yeong-Hwan;Myung, Ho-San;Kang, Nam-Ho;Lee, Chang-Woo;Kim, Min-Jae;Kim, Se-Ho
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.67 no.11
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    • pp.1401-1407
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    • 2018
  • This paper proposed a method of energy storage system (ESS) operation to increase acceptable production of renewable energy (RE). We analyzed the rebound effect that does not show a demand increase even if the capacity of the ESS is increased and considered the charging time by analyzing the time when the output limit is most generated. The rebound effect was mitigated by adjusting the discharging time of the ESS, and the effect of the increase of acceptable production of the renewable energy was analyzed by adjusting the charging time.

A Study on the Energy Saving Capacity of Solar Power Generation System using Economic Evaluation (경제성 평가를 통한 태양광발전시스템 연계형 에너지저장장치 용량 선정에 관한 연구)

  • Lee, Yeo-Jin;Kim, Sung-Yul;Han, Se-Kyung
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.67 no.1
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    • pp.21-26
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    • 2018
  • Due to the international environmental regulations and changes in policies, the demand for generators using the renewable energy is increasing. However, renewable energy generators with intermittent output characteristics such as solar and wind power generators, need the buffer facilities such as ESS during system operations. However, because of low price competitiveness in energy storage system, it is difficult to operate the renewable energy generator with ESS. Therefore, the government has recently proposed a policy to compensate the REC for renewable energy system with ESS. For all this, since the initial cost of the ESS is high, it is the most important to calculate and operate the optimal capacity of the ESS through an economic analysis. In this paper, we proposed the method of calculation the optimal capacity of ESS and analyzed economic feasibility of renewable energy system using the ESS according to depreciation in ESS price.