• 제목/요약/키워드: Electric Energy

검색결과 5,293건 처리시간 0.031초

Charging Control Strategy of Electric Vehicles Based on Particle Swarm Optimization

  • Boo, Chang-Jin
    • 전기전자학회논문지
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    • 제22권2호
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    • pp.455-459
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    • 2018
  • In this paper, proposed a multi-channel charging control strategy for electric vehicle. This control strategy can adjust the charging power according to the calculated state-of-charge (SOC). Electric vehicle (EV) charging system using Particle Swarm Optimization (PSO) algorithm is proposed. A stochastic optimization algorithm technique such as PSO in the time-of-use (TOU) price used for the energy cost minimization. Simulation results show that the energy cost can be reduced using proposed method.

고효율 전기기기 특허동향 분석 (Patent map development of High-efficiency electric machineries)

  • 박종진;이창호;김남정
    • 한국기술혁신학회:학술대회논문집
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    • 한국기술혁신학회 2000년도 추계 학술대회(The 2000 Autumn Conference of korea Technology Inovation Society)(한국기술혁신학회)
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    • pp.177-193
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    • 2000
  • In foreign countries, high-efficiency electric machineries have been developed in view of cost reduction, environmental issues, energy conservation etc. Especially they focus on developing energy conservation measures and demand-side management. Thus, patent application and secure of patent claims are on the rise as important issues in this field. In this paper, we analyzed patent application trends about inverters, ac/dc converters, reactive power control equipments, high-efficiency transformers and electric ballasts among high-efficiency electric machineries. First, we analyzed general technology trends, and constructed patent technology data. Second, we graphed patent application trends in terms of application years, assignees and nations.

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BiTe계 thermoelectric module을 이용한 발전기 제작과 특성 (Manufacturing of thermoelectric generator using BiTe module)

  • 우병철;김봉서;이희웅
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1997년도 하계학술대회 논문집 C
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    • pp.1446-1448
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    • 1997
  • TEC(Thermoelectric conversion) is direct conversion method between thermal energy and electric energy. We studied on the mechanical, electrical and thermal properties of thermoelectric module and made experimental thermoelectric generator with BiTe material.

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전력산업에서 VR/AR 기술동향 및 공통 플랫폼 구성방안 연구 (A Planning study on the VR/AR Common Platform in Electric Power Industry)

  • 채창훈;최민희;유은근;임찬욱;박진우;정남준
    • KEPCO Journal on Electric Power and Energy
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    • 제2권3호
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    • pp.397-402
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    • 2016
  • 최근 세계적인 ICT 기업들이 가상현실 (VR)과 증강현실 (AR) 기술의 생태계 확장을 위하여 많은 노력을 하고 있다. 기존의 엔터테인먼트 분야뿐만 아니라 교육, e-커머스 등 다양한 산업으로 발전시키고 있으며, 전력, 에너지 분야 또한 예외가 아니다. 전력산업에서도 VR/AR 기술 적용을 통한 어플리케이션의 증가가 예상되고 있어, 관련 기술 요소들을 데이터와 프로세스 관점에서 표준화하여 재사용성을 높이고, 기존 Legacy 시스템 연동과 보안 등을 고려한 플랫폼 구성을 선행함으로써 어플리케이션 개발에 효율과 편의성을 극대화할 수 있을 것이다. 본 논문에서는 VR, AR의 기술개발 동향 및 전력산업에서의 적용가능성과 플랫폼의 필요성, 구성요소들을 도출하여 기능적으로 완성도 높고 사용이 편리한 다양한 전력 VR/AR 플랫폼을 제공함으로써 포켓몬고 (Pokemon GO)와 같은 전력분야의 혁명적인 킬러 어플리케이션의 도출과 플랫폼 표준을 이끌어갈 것으로 기대한다.

10 kWh급 초전도 플라이휠 베어링의 강성 평가 (Stiffness Evaluation of High Temperature Superconductor Bearing Stiffness for 10 kWh Superconductor Flywheel Energy Storage System)

  • 박병준;정세용;이정필;박병철;김철희;한상철;두승규;성태현;한영희
    • Progress in Superconductivity
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    • 제11권1호
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    • pp.57-61
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    • 2009
  • A superconductor flywheel energy storage(SFES) system is mainly act an electro-mechanical battery which transfers mechanical energy into electrical form and vice versa. SFES system consists of a pair of non-contacting High Temperature Superconductor (HTS) bearings with a very low frictional loss. But it is essential to design an efficient HTS bearing considering with rotor dynamic properties through correct calculation of stiffness in order to support a huge composite flywheel rotor with high energy storage density. Static properties of HTS bearings provide data to solve problems which may occur easily in a running system. Since stiffness to counter vibration is the main parameter in designing an HTS bearing system, we investigate HTS bearing magnetic force through static properties between the Permanent Magnet(PM) and HTS. We measured axial / radial stiffness and found bearing stiffness can be easily changed by activated vibration direction between PM and HTS bulk. These results are used to determine the optimal design for a 10 kWh SFES.

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Performances of Li-Ion Batteries Using LiNi1-x-yCoxMnyO2 as Cathode Active Materials in Frequency Regulation Application for Power Systems

  • Choi, Jin Hyeok;Kwon, Soon-Jong;Lim, Jungho;Lim, Ji-Hun;Lee, Sung-Eun;Park, Kwangyong
    • KEPCO Journal on Electric Power and Energy
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    • 제6권4호
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    • pp.461-466
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    • 2020
  • There are many application fields of electrical energy storage such as load shifting, integration with renewables, frequency or voltage supports, and so on. Especially, the frequency regulation is needed to stabilize the electric power system, and there have to be more than 1 GW as power reserve in Korea. Ni-rich layered oxide cathode materials have been investigated as a cathode material for Li-ion batteries because of their higher discharge capacity and lower cost than lithium cobalt oxide. Nonetheless, most of them have been investigated using small coin cells, and therefore, there is a limit to understand the deterioration mode of Ni-rich layered oxides in commercial high energy Li-ion batteries. In this paper, the pouch-type 20 Ah-scale Li-ion full cells are fabricated using Ni-rich layered oxides as a cathode and graphite as an anode. Above all, two test conditions for the application of frequency regulation were established in order to examine the performances of cells. Then, the electrochemical performances of two types of Ni-rich layered oxides are compared, and the long-term performance and degradation mode of the cell using cathode material with high nickel contents among them were investigated in the frequency regulation conditions.

수소액화공정에서 LNG 냉열 적용에 관한 시뮬레이션 연구 (Simulation Study on the Application of LNG Cold Energy for Hydrogen Liquefaction Process)

  • 한단비;변현승;백영순
    • 한국수소및신에너지학회논문집
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    • 제31권1호
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    • pp.33-40
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    • 2020
  • As hydrogen utilization becomes more active recently, a large amount of hydrogen should be supplied safely. Among the three supply methods, liquefied hydrogen, which is an optimal method of storage and transportation convenience and high safety, has a low temperature of -253℃, which is complicated by the liquefaction process and consumes a lot of electricity, resulting in high operating costs. In order to reduce the electrical energy required for liquefaction and to raise the efficiency, hydrogen is cooled by using a mixed refrigerant in a precooling step. The electricity required for the precooling process of the mixed refrigerant can be reduced by using the cold energy of LNG. Actually, LNG cold energy is used in refrigeration warehouse and air liquefaction separation process, and a lot of power reduction is achieved. The purpose of this study is to replace the electric power by using LNG cold energy instead of the electric air-cooler to lower the temperature of the hydrogen and refrigerant that are increased due to the compression in the hydrogen liquefaction process. The required energy was obtained by simulating mixed refrigerant (MR) hydrogen liquefaction system with LNG cold heat and electric system. In addition, the power replacement rate of the electric process were obtained with the pressure, the temperature of LNG, the rate of latent heat utilization, and the hydrogen liquefaction capacity, Therefore, optimization of the hydrogen liquefaction system using LNG cold energy was carried out.

저급탄 연소 석탄회의 미연물질 특성 분석 (Characteristics of Unburned Material Derived from Coal-fired Power Plant Burning Low Grade Coal)

  • 박호영;김영주;김태형;백세현;김경수;권달정
    • 에너지공학
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    • 제21권1호
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    • pp.68-74
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    • 2012
  • 국내 석탄화력발전소의 아역청탄과 역청탄의 혼소는 일반화되어 있으며 아역청탄의 비율이 무게 기준으로 50%가 넘는 경우도 있다. 저급탄인 아역청탄의 혼소 비율이 높아짐에 따라 연소 부산물인 비회에서 미연물질이 다량 발생하고 있으며 이는 콘크리트 혼화제로서의 비회 재활용을 가로막는 중요한 인자로 작용하고 있다. 본 연구에서는 아역청탄 혼소율이 높은 국내 500MW 표준 석탄화력발전소에서 미연물질이 포함된 비회를 입수하여 이에 대한 분석을 수행하였다. 이러한 미연물질은 석탄의 열분해 생성물인 검댕(soot)인 것으로 나타났으며 실제 석탄화력발전소에서 사용하고 있는 석탄과 혼탄의 성상 데이터와 CPD모델을 사용하여 혼탄별 검댕(soot)의 발생가능성을 분석하였다.