• Title/Summary/Keyword: Charging Equipment

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A Study on the Solar Cell Charging Equipment for Hybrid Vehicle (Hybrid 자동차용 Solar Cell 충전장치에 관한 연구)

  • Kim, G.S.;Park, S.C.
    • Journal of the Korean Society of Mechanical Technology
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    • v.13 no.4
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    • pp.157-164
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    • 2011
  • Hybrid car can improve fuel efficiency using a power of motor that is generated during constant-speed or deceleration driving. The motor is located between engine and transmission. But, when voltage of main battery is low, fuel efficiency is low because the voltage can't run the motor. In this situation, this study observed fuel efficiency when using solar cell for assistance power. In order to verify a fuel consumption of hybrid car equipped solar cell for assistance power, the car was tested downtown driving. As hybrid car was equipped solar cell for assistance, fuel consumption was reduced 8.35 % at running air conditioner. And, at air conditioner doesn't work, fuel consumption was reduced 6.88 %. This point of view, CO2 is expected to reduce in similar proportion.

A Study on the Parameters Estimation for SOC and SOH of the Battery (SOC 및 SOH 추정을 위한 파라미터 추정기법에 관한 연구)

  • Park, Sung-Jun;Song, Gwang-Suk;Park, Seong-Mi
    • Journal of the Korean Society of Industry Convergence
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    • v.23 no.5
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    • pp.853-863
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    • 2020
  • As the battery ages, the internal resistance of the battery increases, so the loss due to the internal resistance increases at the same charging current, causing the battery temperature to rise, which further accelerates battery aging. Therefore, it is necessary to optimize the charging conditions according to the aging of the battery or the current charge amount, and to accurately estimate this, estimation of the parameters of the equivalent circuit is most important. This paper proposes a new measurement technique that can measure the internal resistance of a battery by analyzing a specific high frequency voltage and current applied to the battery. In addition, in order to test the validity of the proposed measurement technique, the current charging amount was estimated based on the measured internal resistance, and the terminal voltage of the constant current charging mode was automatically set and operated. As a result, good results were obtained regardless of the battery voltage. If this equipment is installed in the charging device, it is believed that it will be of great help in the stability management of the aging reusable battery.

A Study on Stable Operation of Li-ion Battery Charging/Discharging System (Li-ion 배터리 충/방전 시스템의 안정적 운영에 관한 연구)

  • Yeo, Sung-Dae;Han, Cheol-Kyu;Cho, Tae-Il;Lee, Kyung-Ryang;Kim, Seong-Kweon
    • The Journal of the Korea institute of electronic communication sciences
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    • v.11 no.4
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    • pp.395-402
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    • 2016
  • When the operation of battery is converted at charging and discharging system based on a DC micro grid, the voltage is fluctuated. And excessive voltage fluctuation could cause damage or failure of charging and discharging equipment. Therefore, in this paper, we studied the operating schedule of the charging and discharging system based on the DC micro grid and a design point of the capacitor which was able to reduce the voltage fluctuation. A result of computer simulation showed that when a fluctuation-reducing capacitor which had an initial value of 600V/35mF was applied at the charging and discharging system based on a DC micro grid which was operated with three charging battery sets and five discharging battery sets, voltage fluctuation by charging and discharging operation was reduced by about 63.3%. Furthermore, voltage fluctuation which occurred when initial network voltage was stabilized was reduced by about 73%.

The Experimental Study on the Performance of Two-Phase Loop Thermosyphone System for Electronic Equipment Cooling (전자장비 냉각을 위한 2상 순환형 써모사이폰 시스템의 성능에 대한 실험적 연구)

  • Kang, In-Seak;Choi, Dong-Kyu;Kim, Taig-Young
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.28 no.4
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    • pp.415-424
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    • 2004
  • Cooling the electronic equipment is one of the major focal points of the design process and the key to successful product launch. The two-phase loop thermosyphone which is a good candidate among many available options was investigated fur cooling of the high power amplifiers. The system is composed of evaporator which contains 6 parallel cold plates, fan cooled condenser, gas-liquid separator, and interconnecting tubes. Experiments were performed for several refrigerant charging values, hs and as a experiment result, the optimum charging value fur this system was proposed. In order to optimize the system design, the operating cycle pressure and inlet/outlet temperatures of evaporator and condenser are measured and analyzed. The effect of the three parameters such as flow rate and temperature of condenser cooling air, and thermal load on the evaporator are investigated. The lower the operating pressure and the cycle temperatures are also better to prevent the leakage of the system. The system invesigated in this paper can be directly used for cooling of a real unmanned wireless communication station.

A Method to Calculate Charge for Reactive Power Service under Competition of Electric Power Utilities

  • Ro, Kyoung-Soo;Park, Sung-Chul
    • KIEE International Transactions on Power Engineering
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    • v.11A no.4
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    • pp.39-44
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    • 2001
  • As electric power systems have been moving from vertically integrated utilities to a deregulated environment, the charging of reactive power management is a new challenging them for market operators. This paper proposes a new methodology to compute the costs of providing reactive power management service in a competitive electrical power market. The proposed formulation, which is basically different from those shown in the literature, consists of two parts. One is to recover investment capital costs of reactive power supporting equipment based on a reactive power flow tracing algorithm. The other is to recover operational costs based on variable spot prices using the optimal power flow algorithm. The charging shapes resulted from the proposed approach exhibit a quite good meaning viewed from a practical sense. It turns out that reactive power charged are mostly due to recovery of capital costs and slightly due to recovery of operational costs. The methods can be useful in providing additional insight into power system operation and can be used to determined tariffs of a reactive power management service.

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A Performance Evaluation of a Heat Dissipation Design for a Lithium-Ion Energy Storage System Using Infrared Thermal Imaging (적외선 열화상을 활용한 리튬 이온 ESS의 방열설계 성능평가에 관한 연구)

  • Kim, Eun-Ji;Lee, Gyung-Il;Kim, Jae-Yeol
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.19 no.5
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    • pp.105-110
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    • 2020
  • The global battery market is rapidly growing due to the development of vehicles(EV) and wireless electronic products. In particular logistics robots, which hielp to produce EVs, have attracted much interest in research in Korea Because logistics sites and factories operate continuously for 24 hours, the technology that can dramatically increase the operation time of the logistics equipment is rapidly developing, and various high-level technologies are required for the batteries used in. for example, logistics robots. These required technologies include those that enable rapid battery charging as well wireless charging to charge batteries while moving. The development of these technologies, however, result in increasing explosions and topical accidents involving rapid charging batteries These accidents due to the thermal shock caused by the heat generated during the charging of the battery cell. In this study, a performance evaluation of a heat dissipation design using infrared thermal imaging was performed on an energy storage systrm(Ess) applied with an internal heat conduction cooling method using a heating plate.

A Study on the Development of Charging Algorithm for Battery Charger Control Unit of the T-50 Series Aircraft (T-50 계열 항공기 배터리 시스템의 충전제어장치 알고리즘 개선에 관한 연구)

  • Jaejeong Kim;Soonyoung Lee
    • Journal of Aerospace System Engineering
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    • v.17 no.6
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    • pp.144-148
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    • 2023
  • Aircraft battery is the core equipment of an aircraft that supplies engine starting power and emergency power, and it must be charged to ensure sufficient capacity at all times and maintain high reliability to ensure stable power supply. The battery of the T-50 series aircraft is designed to enable the engine to start up to two times in temperatures as low as -18℃ and above. However, intermittent failures in engine starting have been observed during winter. In this paper, we analyze the failure phenomena occurring during low-temperature charging of the battery and improve the charging algorithm based on the analysis and test. Additionally, the results of start simulation tests show that the battery charging defects at low temperatures are resolved, and an improvement in the charging performance is confirmed; thus, validating the effectiveness of the new algorithm.

Study of N-Port Electric Vehicle Charging Systems Using OPC-UA (OPC UA를 이용한 N-Port EV 충전 시스템 연구)

  • Lee, Seong Joon
    • KIPS Transactions on Computer and Communication Systems
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    • v.6 no.8
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    • pp.343-352
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    • 2017
  • IEC62541, known as OPC-UA, is a standard communication protocol for Smart Grid (SG) and Smart Factory application platform. It was accepted as an IEC standard (IEC62541) in 2011 by IEC TC57, and is extending range of application as collaborating with other standrads. The government's policies to popularize EVs ("Workplace Charging Challenge"), the number of Electric vehicle which try to be charging in the factory is expected to increase. In this situation, indiscreet and uncontrolled EV charging can lead to some problems, such as excess of the peak demand capacity. Therefore, EVs, which is charging in SFs, must be monitoring and controlling to avoid and reduce peak demand. However, the standards for EVs charging differ from the standards for SFs. In other words, to increase the ease of use for drivers, and reduce risk for enterprise, we have needs of study to develop the protocols or to provide interoperability, for EVs charging in SFs. This paper deals with a EV charging management platform installing in a smart factory. And this platform can be easily integrated as part of SF management software. The main goal of this paper is to implement EV management system based on IEC61851 and IEC62541.