• Title, Summary, Keyword: SOC

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The Experimental Study of SOC and Measurement Results on Fuel Economy of the Hybrid Electric Vehicle (하이브리드자동차의 연료소비율 시험 시 초기 SOC와 측정결과에 대한 실험적 연구)

  • Kim, Kwang-Il;Kwon, Hae-Boung;Lee, Hyun-Woo;Lim, Jong-Soon;Shin, Young-Bok
    • 한국신재생에너지학회:학술대회논문집
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    • pp.534-537
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    • 2008
  • 하이브리드자동차의 연료소비율 시험 시 초기 SOC 조건에 따른 SOC와 연비 변화 특성을 파악하기 위해 2종의 차종을 선택하여 UDDS 모드주행 실험을 실시하였다. 실험결과 Strong type 자동차는 주행시작 약 550초 경과 후 SOC 52 $\sim$ 54%로 수렴하였다. 또한 일반 시가지 주행조건에서는 SOC를 50$\sim$55 % 범위에서 제어함을 알 수 있으며, 초기 SOC 조건에 따라 연비는 약 79%의 편차가 나타났다. 이는 저속구간에서 순수 전기자동차 구동이 구현됨으로써 SOC 70%에서 큰 연비 상승 효과가 나타나는 것으로 판단 된다. Mild type 자동차는 연비가 초기 SOC 조건에 따라 약 5%의 편차가 나타남을 알 수 있었으며, SOC 변화특성은 배터리 충전상태에 따라 충전량 제어는 이루어지나 가속 시 어시스트만 이루어지는 시스템적 특성상 효율적인 SOC 제어가 이루어지지 않아 연비에는 큰 영향을 주지 않는 것으로 생각된다.

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New State-of-Charge Polynomial using Hermite Interpolation (헤르미트 보간법을 이용한 새로운 SOC 다항식)

  • Jung, Ji-Heung;Jeon, Joon-Hyeon
    • Journal of the Institute of Electronics Engineers of Korea SC
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    • v.48 no.1
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    • pp.9-17
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    • 2011
  • This paper provides, through the use of Hermite Interpolation, a new polynomial for Storage of Charge(SOC) solution of the low-power-battery. It also gives a general formula which permits direct and simple computation of coefficients of the proposed polynomial. From the simulation results based on real SOC, it is shown that this new approach is more accurate and computationally efficient than previous Boltzmann's SOC. This solution provides a new insight into the development of SOC algorithm.

SOC Observer based on Piecewise Linear Modeling for Lithium-Polymer Battery (구간선형 모델링 기반의 리튬-폴리머 배터리 SOC 관측기)

  • Chung, Gyo-Bum
    • The Transactions of the Korean Institute of Power Electronics
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    • v.20 no.4
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    • pp.344-350
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    • 2015
  • A battery management system requires accurate information on the battery state of charge (SOC) to achieve efficient energy management of electric vehicle and renewable energy systems. Although correct SOC estimation is difficult because of the changes in the electrical characteristics of the battery attributed to ambient temperature, service life, and operating point, various methods for accurate SOC estimation have been reported. On the basis of piecewise linear (PWL) modeling technique, this paper proposes a simple SOC observer for lithium-polymer batteries. For performance evaluation, the SOC estimated by the PWL SOC observer, the SOC measured by the battery-discharging experiment and the SOC estimated by the extended Kalman filter (EKF) estimator were compared through a PSIM simulation study.

Battery State of Charge Estimation Considering the Battery Aging (배터리의 노화 상태를 고려한 배터리 SOC 추정)

  • Lee, Seung-Ho;Park, Min-Kee
    • Journal of IKEEE
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    • v.18 no.3
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    • pp.298-304
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    • 2014
  • Proper operation of the battery powered systems depends on the accuracy of the battery SOC(State of Charge) estimation, therefore it is critical for those systems that SOC is accurately determined. The SOC of the battery is related to the battery aging and the SOC estimation methods without considering the aging of the battery are not accurate. In this paper, a new method that accurately estimate the SOC of the battery is proposed considering the aging of the battery. A mathematical model for the Battery SOC-OCV(Open Circuit Voltage) relationship is presented using Boltzmann equation and aging indicator is defined, and then the SOC is estimated combining the mathematical model and aging indicator. The proposed method takes the aging of the battery into consideration, which leads to an accurate estimation of the SOC. The simulations and experiments show the effectiveness of the proposed method for improving the accuracy of the SOC estimation.

A pilot study on SOC information system for SOC report card writing support (국내 SOC 리포트카드 작성 지원을 위한 SOC 정보시스템 시범 구축 연구)

  • Jang, Youn-Mi;Hong, Chang-Hee
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.18 no.2
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    • pp.142-148
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    • 2017
  • Along with economic growth in the 1970s, the nation's economy, railroads, and airports have soared, but the facilities have been aging for 30 years. The aging SOC lowers the national competitiveness and threatens the safety of the people. SOC is a key asset of the national life and economic activity, and is a key factor for evaluating the national competitiveness. Therefore, it is necessary to systematically manage and operate the SOC related to people's lives. In the USA, the SOC report card is issued regularly. Those reports are used as a basis for securing budgets. In Korea, facilities management institutions are different. Therefore, there is no integrated SOC monitoring system. Hence, this study developed a 'SOC information system' that can collect reports scattered throughout the country and support report cards. The demonstration system was implemented through the web and the feasibility of implementing the evaluation support system was confirmed. The collection distributed SOC data should be supported by national policy. Although it takes a long time, it is necessary to improve national competitiveness and public safety.

Chronological Changes of Soil Organic Carbon from 2003 to 2010 in Korea

  • Kim, Yoo Hak;Kang, Seong Soo;Kong, Myung Suk;Kim, Myung Sook;Sonn, Yeon Kyu;Chae, Mi Jin;Lee, Chang Hoon
    • Korean Journal of Soil Science and Fertilizer
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    • v.47 no.3
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    • pp.205-212
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    • 2014
  • Chronological changes of soil organic carbon (SOC) must be prepared by IPCC guidelines for national greenhouse gas inventories. IPCC suggested default reference SOC stocks for mineral soils and relative stock factors for different management activities where country own factors were not prepared. 3.4 million data were downloaded from agricultural soil information system and analyzed to get chronological changes of SOC for some counties and for land use in Korea. SOC content of orchard soil was higher than the other soils but chronological SOC changes of all land use had no tendency in differences with high standard deviation. SOC contents of counties depended on their own management activities and chronological SOC changes of districts also had no tendency in differences. Thus, Korea should survey the official records and relative stock factors on management activities such as land use, tillage and input of organic matter to calculate SOC stocks correctly. Otherwise, Korea should establish a model for predicting SOC by analyzing selected representative fields and by calculating SOC differences from comparing management activities of lands with those of representative fields.

Prioritizing SOC Facilities for Applying BIM/GIS Integrating Platform to Local Governments (지방자치단체에 BIM/GIS 통합 플랫폼 적용을 위한 SOC 시설물 우선순위 선정방안)

  • Youn, Jun Hee;Lee, Woo Sik;Choi, Hyun Sang;Kang, Tae Wook
    • Spatial Information Research
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    • v.21 no.5
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    • pp.7-14
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    • 2013
  • Recently, BIM(Building Information Model) is widely applied to all stages of SOC (Social Overhead Capital)facilities life cycle from planning to maintenance. While BIM is an analysis tool focussing the inner space of facilities, GIS is principally applied to analyzing relationship between facilities. Therefore, integrating BIM and GIS, we expect to get a potential synergy effect in aspects of effective information management and various analysis for SOC facilities. This paper deals with prioritizing SOC facilities for applying BIM/GIS integrating platform to local governments. First, investigate facilities required by law, and identify SOC facilities suitable for SOC characteristics. Second, analyze the effectiveness and applicability of BIM/GIS integrating platform applying each facility. For the purpose, we quantify effectiveness and applicability in aspects of UIS management and GIS functions. Lastly, prioritize the SOC facilities applying BIM/GIS integrating platform.