• Title, Summary, Keyword: SOC recovery

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Design and Implementation of Web-Based Support System for Disaster Damage Recovery of SOC Facility (웹기반 SOC 시설물 재난피해복구지원시스템 설계 및 구현)

  • Yoon, Hyuk-Jin;Lee, Keum-Tark;Kim, Joo-Sung;Chang, Tai-Woo
    • The Journal of Society for e-Business Studies
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    • v.20 no.4
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    • pp.227-239
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    • 2015
  • To decrease the damage of infrastructure from the natural disaster, initial reaction and emergent recovery are important. But up to now emergent recovery has mainly focused on the situation notices owing to the lack of technical support. In this paper, we described a web-based support system for disaster damage recovery of facility and electronic documents for requesting support of recovery resources. Recovery methods are decided using the damage recovery scenarios based on the acquired damage information, and the allocated recovery resources information is delivered to the recovery resources owner using the electronic documents. This system could readily be used for disaster response and emergency recovery.

Integrated Control Strategy of Multiple BESS for providing Primary Frequency Control (주파수추종서비스 제공을 위한 다수 배터리전기저장장치(BESS)의 통합제어 전략)

  • Yu, Ga Ram;Choi, Woo Yeong;Kook, Kyung Soo
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.7
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    • pp.1169-1175
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    • 2016
  • As an Increased penetration level of renewable resources has caused concerns about primary frequency response, an increase in BESS(Battery Energy Storage System) capacity has been expected because of its fast response to the disturbances in the power system. This paper proposes the Integrated Control Strategy of multiple BESS for effectively providing the primary frequency control in the bulk power systems by coordinating the response, SOC and its recovery of BESS. The proposed strategy prevents multiple BESS from providing exceeding response and keeps the balance between SOC of multiple BESS. In addition, It would recover the SOC of BESS efficiently. The effectiveness of the proposed strategy is verified through various case studies employing Korean power system.

Study of Fuel Consumption Characteristics and Regenerative Braking Recovery Rate in a TMED Type Parallel Hybrid Electric Vehicle (TMED방식 병렬형 하이브리드 차량의 회생제동 회수율 및 연비 특성 연구)

  • Chung, Jin Ho;Kim, Jin Su;Kim, Ju Whan;Lee, Jin Wook
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.40 no.8
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    • pp.485-494
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    • 2016
  • In this work, we conducted a study of fuel consumption characteristics and regenerative braking recovery rate by conducting an experiment using a TMED type parallel hybrid electric vehicle. As regenerative braking technology is considered essential to improve the energy efficiency of the hybrid vehicle, it is necessary to conduct research on the regenerative braking system. Therefore, the electrical characteristics, current balance, and fuel consumption were investigated using an EC type chassis dynamometer with experimental conditions as per IM240 mode. From the results, it was observed that when the initial SOC condition was lower, the engine operating time of the hybrid vehicle increased, and the energy efficiency decreased. While operating in the driving mode characteristics condition and the driving characteristics condition, the difference in the average fuel consumption was not significant. However, after completion of the experiment, there was a difference in the engine operation.

Robust Symbol Timing Recovery for Telephone tine Modems

  • Hwang, Sung-Hyun;Park, Hyun-Cheol k;Park, Hyung-Jin
    • Proceedings of the IEEK Conference
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    • pp.1819-1822
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    • 2002
  • The authors propose a robust symbol timing recovery (STR) for telephone line modems supporting data rates up to 32 Mbps. The STR is initialized by a start signal from carrier sensor, and the novel method is proposed which resolves the difference between the frequency of the transmitter's clock and the receiver's clock, called baud frequency offset. The proposed method is applied on digital receiver in a 16 frequency diverse quadrature amplitude modulation (FDQAM) system.

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Operational Strategy for a BESS-based Microgrid (BESS 기반 마이크로그리드 운영전략)

  • Lee, Ha-Lim;Chun, Yeong-Han
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.64 no.12
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    • pp.1666-1672
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    • 2015
  • Small islands are quite adequate places where microgrid system with renewable sources can replace diesel engines as operation costs of diesel engine in most small islands are very high. To get the large amount of renewable energy, the microgrid system has very large capacity of renewable sources. The system with large capacity of renewable sources can meet the case when supplied energy is greater than the load and the fluctuation of source output is very large. The battery energy storage system can be a solution to stabilize the system with large capacity of renewable sources. In this case, BESS can be utilized as a master source for the synchronous operation of all sources including diesel engine, wind turbine and PV. The diesel generators can be used as a backup in case the BESS SOC goes below a certain level. In this paper, we suggest a novel unit commitment of diesel generators and operation schedule of pump for water supply service with the information of wind forecast, PV forecast, and load forecast. The proposed methods has been implemented and tested at the test bed in Gasa-Island.

A Development Direction of Infrastructure Based Disaster Mitigation & Management Integrated System (SOC 시설물 재난대응 및 관리시스템 개발방향)

  • Park, Suyeul;Oh, Eunho;Choi, Bonghyuck;Kim, Jinman
    • Korean Journal of Construction Engineering and Management
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    • v.17 no.3
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    • pp.134-142
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    • 2016
  • Main infrastructures, such as levee, dam, bridge, road, etc., are very important due to not only the means of support for social and industrial activities in normal situation but also the means of protection of life and property during disaster occurrence. In spite of this importance of infrastructures, however, any disaster management systems that actively use these infrastructures are not developed yet. Moreover, infrastructures are not usually included in emergency action plans, thus it occurs second and third impact on communities and industries due to collapsing or damage of infrastructures. Therefore, the authors in this paper analyzed previous research, SWOT, STEEP, and patents and technical journals and conducted a technology need survey ni order to understand the trend of disaster management system as well as suggest main research fields and detail research items. The results of this paper will be a foundation of developing an advanced infrastructure integrated system of maintenance and disaster mitigation and contribute our nation to have an active response system by using infrastructure.

SOC Project Plans and Cultural Resource Management in the North Korean Region : Suggestions for Systematic Investigation and Management of North Korean Cultural Heritage (북한지역 SOC사업 구상과 문화유산 - 북한 문화유산의 효율적인 조사·관리를 위한 제언 -)

  • Kim, Beom-Cheol
    • MUNHWAJAE Korean Journal of Cultural Heritage Studies
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    • v.52 no.2
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    • pp.4-19
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    • 2019
  • Despite continuous volatility in ideological leanings, South Korean governments, conservative or progressive, have published a series of plans for aiding the economic development of North Korea. The Moon administration's plan is the paragon of such efforts. In addition, recent detente between the North Korean regime and the US government evokes much hope in its success. There is, hidden behind the veil of hope, apprehension about the crisis of management of cultural heritage in the North Korean region. It is believed that development policies may overwhelm efforts at conservation of cultural heritage, in particular that the hurrying of development projects would provoke insufficient and inappropriate investigation of archaeological sites., If these problems arise, responsibility for their resolution would be carried by South Korean archaeologists and governmental institutes. This paper reviews what the South Korean government has suggested for North Korea's economic recovery and examines what capability the South Korean archaeology sector has for investigating North Korean cultural heritage. It then discusses the scale of investigation needed, and what should beused as precedent in planning substantial excavations when development projects are performed in the North Korean region. Constructing a digital map system for cultural heritage of North Korea is suggested as one of the most urgent tasks precedent to substantial excavations. It is of great importance because we do not currently have any substantial information about the locations and current condition of cultural heritage sites and artifacts in the North Korean region. The mapping of Bronze Age sites in North Korea, conducted as a sort of pilot test, revealed that archaeological sites are densely distributed in several regions, especially Hwanghae-do and Pyoyang Directly-Administrated City, and that there is high potential of discovering new sites.

The Analysis and Optimization far the Braking System in Electric Vehicle (전기자동차용 제동 시스템 해석 및 최적화에 관한 연구)

  • 오재응;이준일;이충휘;조용구;이유엽;이정윤
    • Transactions of the Korean Society of Automotive Engineers
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    • v.11 no.1
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    • pp.172-178
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    • 2003
  • Driving range is one of the main problems in development of Electric Vehicles(EV). The Regenerative. braking system is required to overcome the problem, which converts kinetic energy of the vehicle during braking into electrical energy. This paper discusses the braking system of EV and Robust design especially developed to maximize energy recovery and to optimize braking performance. This is promised to be applied to the design of elements for EV braking system.

Techno-Economic Analysis of Reversible Solid Oxide Fuel Cell System Couple with Waste Steam (폐스팀을 이용한 가역 고체산화물 연료전지의 기술적 경제적 해석)

  • GIAP, VAN-TIEN;LEE, YOUNG DUK;KIM, YOUNG SANG;AHN, KOOK YOUNG
    • Transactions of the Korean hydrogen and new energy society
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    • v.30 no.1
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    • pp.21-28
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    • 2019
  • Reversible solid oxide fuel cell (ReSOC) system was integrated with waste steam for electrical energy storage in distributed energy storage application. Waste steam was utilized as external heat in SOEC mode for higher hydrogen production efficiency. Three system configurations were analyzed to evaluate techno-economic performance. The first system is a simple configuration to minimize the cost of balance of plant. The second system is the more complicated configuration with heat recovery steam generator (HRSG). The third system is featured with HRSG and fuel recirculation by blower. Lumped models were used for system performance analyses. The ReSOC stack was characterized by applying area specific resistance value at fixed operating pressure and temperature. In economical assessment, the levelized costs of energy storage (LCOS) were calculated for three system configurations based on capital investment. The system lifetime was assumed 20 years with ReSOC stack replaced every 5 years, inflation rate of 2%, and capacity factor of 80%. The results showed that the exergy round-trip efficiency of system 1, 2, 3 were 47.9%, 48.8%, and 52.8% respectively. The high round-trip efficiency of third system compared to others is attributed to the remarkable reduction in steam requirement and hydrogen compression power owning to fuel recirculation. The result from economic calculation showed that the LCOS values of system 1, 2, 3 were 3.46 ¢/kWh, 3.43 ¢/kWh, and 3.14 ¢/kWh, respectively. Even though the systems 2 and 3 have expensive HRSG, they showed higher round-trip efficiencies and significant reduction in boiler and hydrogen compressor cost.

A Study on the Improvement of Management for Survey Control Points in Seoul City (서울시 측량 기준점 관리 개선방안에 관한 연구)

  • Lee, Woo Sik;Lee, Eun Young
    • Spatial Information Research
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    • v.20 no.5
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    • pp.111-118
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    • 2012
  • Survey control points managed by national and local governments are associated with civilian's property and they are very important national facilities. Despite the importance of surveying results, Database and mark of survey control points, there are many problems noticed of the management aspects such as manpower, systems, and related law. Currently, each local government has built and operated Geographic Information System(GIS) independently by National Geographic Information Systems(NGIS) results. but it is still difficult to have the integration, linking and utilizing. Therefore, In this study proposed the functional improvement of GIS based control points integrated system for providing information and management and the establishment of first-payment system due to the moving of control points. Through this studies will be able to solve the problem of recovery charges according to unknown contractor and establish the basis of manager and user-centric one-stop integration system.