• Title, Summary, Keyword: ESS

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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.

A Study on Establishing Operation Mathematical Model for Optimum Capacity Estimation of the ESS Applications for each in the Nationwide Perspective (국가적 관점에서 용도별 ESS 적정용량 산정을 위한 운전수리모델 수립에 대한 연구)

  • Kim, Jung-Hoon;Youn, Seok-Min
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.6
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    • pp.969-978
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    • 2016
  • Around the world are increasing the demand for ESS. Currently, the domestic is expected to benefit by operating ESS. In the domestic, it is expected to benefit from operations of the installed ESS because of the introduction of ESS less capacity. However ESS capacity to the maximum profit occurs is unknown. ESS is different from the charge-discharge characteristics and the reserve to replace, depending on the application. Therefore, it should be established in accordance with the ESS optimal capacity according to the purpose used because it can maximize the quality and efficiency of the electric energy. To the ESS optimal capacity estimation by the purpose used, It should compare the investment cost caused by ESS facility installation and operation cost caused by operating ESS. In this paper, the operation mathematical model for estimating marginal operation costs established. In operation mathematical model, operating cost is considered fuel cost and no-load cost start-up cost. Because no-load cost and start-up cost are not related to cost and power plant output, there are expressed an integer variable costs as a step function.

A Study on System Structure and GUI Implement for Secure ESS use (안전한 ESS 사용을 위한 System 구조와 GUI 구현에 관한 연구)

  • Kim, Wantae;Kim, Hyunsik;Park, Byungjoon
    • Journal of the Korea Society of Digital Industry and Information Management
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    • v.15 no.2
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    • pp.11-17
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    • 2019
  • As interest in the efficiency use of energy has been recently rising, studies have been performed in utilizing various types of eco-friendly green energy and natural energy. Especially there has been rapidly increase in the fields using ESS (Energy Storage System), which is the technology for storing the energy from nature. The application fields of ESS is continuously growing and expanding to various types of technologies. However, in recent years there have been continuing problems with the safety of ESS. And related researches are going on. In this paper, we has proposed a system structure to utilize more secure ESS and has monitored the system status of ESS in real time by using smart phone app. This paper has also proposed a new method to configure secure ESS by implementing GUI (Graphical User Interface) to control the system. And then explain experimental results to investigate the efficiency of the proposed ESS.

Calculation of ESS Capacity of Industrial Customer through Economic Analysis (경제성 분석을 통한 산업용 수용가의 ESS 설치 용량 산정)

  • Hong, Jong-Seok;Chai, Hui-Seok;Moon, Jong-Fil
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.64 no.4
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    • pp.273-276
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    • 2015
  • In this paper, ESS capacity installed in industrial customer is calculated using economic analysis. To do this, electric charge for industrial customer is analyzed and power management system(PMS) of ESS is selected. Reduction of kW cost and kWh cost are set to 'benefit' according to operation of ESS. Also, installation cost and maintenance cost of ESS are set to 'cost'. Proper ESS capacity is determined as a result of benefit-to-cost(B/C) analysis according to the variation of ESS installation cost. In case study, B/C is analyzed for the specific industrial customer and minimum capacity of ESS to make a profit are proposed for the customer.

A Study on ESS Process Modeling and Application for Improving Reliability of Electronic Equipments (전자장비 신뢰성 향상을 위한 ESS 프로세스 모델링 및 적용에 관한 연구)

  • Choi, Jong-Soo;Lee, Chang-Woo
    • Journal of the Korean Society for Quality Management
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    • v.40 no.3
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    • pp.286-294
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    • 2012
  • Purpose: In this study, we propose the ESS process model which, in order to improve reliability of electronic equipment, can be referenced in both development and production phases. Methods: ESS guidelines such as MIL handbooks or private sector ESS guidelines are used for devising the proposed ESS model. Especially, proposed model is customized by using those references in order to be optimized in the domestic development and production phases. Results: ESS-related-requirements which is specified in the Technical Data Package(TDP) for the area of guided missile systems are analyzed. Current status of the requirement and screening strength are analyzed for those systems to show what kind of weak points should be improved. Conclusion: A ESS guideline which is applicable to the domestic weapon acquisition environment is proposed. As such, the necessity and detail guidelines of the proposed model are explained.

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.

A Study on ESS-based Clean Energy, Smart Home IoT Platform (ESS기반 클린에너지, 스마트홈 IoT 플랫폼 연구)

  • Kim, Hee-Chul
    • The Journal of the Korea institute of electronic communication sciences
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    • v.13 no.1
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    • pp.147-152
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    • 2018
  • This study investigates the demand management and energy saving plan of the apartment house based on the ESS (: Energy Storage System), which is the main equipment in the field of electric power energy efficiency, and suggests standardization for various technical factors and operation. It contributes to the spread of ESS industry. In addition, to create ESS market for apartment houses and smart homes, housing IoT technology is used to integrate apartment houses with smart home-based ESS and it is possible to achieve use efficiency and economic feasibility of power users, We will study a business model that can reconsider the acceptability of power users.

Characteristics of Utility Transformer on Household Single-Phase ESS-PCS According to LC Filter Location (주택용 단상 ESS-PCS의 LC 필터위치에 따른 상용변압기의 특성)

  • Kim, Yong-Jung;Kim, Hyosung
    • The Transactions of the Korean Institute of Power Electronics
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    • v.23 no.2
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    • pp.101-105
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    • 2018
  • Shortage of electric power occurs frequently along with increased electric power demand. ESS is a precaution to solve this issue. Household ESS has a capacity of approximately 3 kW/7 kWh. Household ESS batteries are typically designed with nominal voltages between 40 and 50 V. To connect household ESS with a 220 V AC system, low battery voltages in power conditioning system (PCS) should be boosted. To boost low battery voltage and match it with AC grid voltage, the use of a transformer for a commercial frequency can be considered. To attenuate switching harmonics of the household single-phase ESS-PCS, LC filter can be installed in two positions: on the primary side or on the secondary side of a transformer. A method has been used generally in single-phase inverters for the ESS-PCS. In another method, however, the output efficiency of the ESS-PCS may be decreased. Parasitic components of the transformer can affect voltage losses, when the square wave with the switching frequency in the ESS-PCS is passed through the transformer windings. In this work, the characteristics of the transformer according to the position of an LC filter are investigated for household single-phase ESS-PCS.

A Study on the Fire Risk of ESS through Fire Status and Field Investigation (화재현황 및 현장조사를 통한 ESS의 화재 위험성 연구)

  • Park, Kwang-Muk;Kim, Jae-Hyun;Park, Jin-Yeong;Bang, Sun-Bae
    • Fire Science and Engineering
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    • v.32 no.6
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    • pp.91-99
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    • 2018
  • Recently, the spread of ESS in Korea has increased and a fire accident has also occurred. By July 2018, there were a total of 7 cases. All 7 cases were ESS systems consisting of lithium-ion batteries and were burned down. Both the automatic fire extinguisher and the fire department were not able to digest. In this paper, the characteristics of ESS fire are analyzed based on recent ESS fire situation and field investigation, and the cause of fire is divided into environmental, electrical and thermal factors. As a result, it was found that the ESS fire was correlated with the installation environment of the system. In the domestic and overseas lithium ion battery test standard and ESS facility standard survey, the trends and differences of domestic and overseas facilities standards were identified. Based on the fire status and field investigationy, and domestic and overseas facility standard survey, measures were suggested to prevent and prevent the spread of fire in ESS fire.

A Study on the Economic Analysis Method of Energy Storage System (에너지 저장 시스템(ESS)의 경제성 분석 기법에 관한 연구)

  • Yoon, Young-Sang;Choi, Jae-Hyun;Choi, Yong-Lak;Shin, Yongtae;Kim, Jong-Bae
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.19 no.3
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    • pp.596-606
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    • 2015
  • Recently, the government is promoting the new renewable energy spread and expansion policy. To this end, the investment and the research is ongoing on the core of the ESS (Energy Storage System) for the Smart Grid that is being spread around the industrialized countries. US and European countries have also conducted a variety of ESS related systems maintenance and improvement in order to induce the activation of the ESS industry. On the other hand, our country has no law and institutional foundation for the introduction of activation ESS, and there is no objective basis for the economic impact of the introduction of the ESS. Therefore, spread and activation of the ESS is not properly conducted. In this paper, the economics of the ESS based on the Korea electric pricing system for the spread and activation of the ESS effectively proposes a technique for analysis. To do this, define the ESS operating model, and propose the best economic analysis method economic analysis comparing each operating model.