• Title/Summary/Keyword: 전기이중층 커패시터

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Bidirectional Charging/Discharging Digital Control System for Eco-friendly Capacitor Energy Storage Device Implemented by TMS320F28335 chip (TMS320F28335로 구현한 친환경 커패시터 전력저장장치의 양방향 디지털 제어 충/방전 시스템)

  • Lee, Jung-Im;Lee, Jong-Hyun;Jung, An-Yoel;Lee, Choon-Ho;Park, Joung-Hu;Jeon, Hee-Jong
    • The Transactions of the Korean Institute of Power Electronics
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    • v.15 no.3
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    • pp.188-198
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    • 2010
  • Recently, as the demand of the environmental-friendly energy storage system such as an electric double-layer condenser increases, that of the bidirectional charger/discharger for the systems also increases. However, when charging/discharging mode-change occurs, the charger/discharger employing a bi-directional DC-DC converter with a commercialized analog controller has a complex circuit scheme, and a poor transient response. On the other hand, if a single digital controller is used for the bi-directional mode, the system performances can be improved by application of an advanced power-processing algorithm. In the paper, an environmental-friendly power storage systems including an Electric Double Layer Capacitor(EDLC) banks were developed with a bi-directional buck-boost converter and a digital signal processor (TMS320F28335). A simulation test-bed was realized and tested by MATLAB Simulink, and the hardware experiment was performed which shows that the dynamic response was improved such as the simulation results.

Electrochemical Behaviors of Carbon Aerogel Electrodes for Electric Double Layer Capacitors (전기이중층 커패시터용 탄소 에어로겔 전극의 전기화학적 거동 연구)

  • Yang, Jae-Yeon;Seo, Min-Kang;Kim, Byoung-Suhk
    • Composites Research
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    • v.33 no.6
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    • pp.336-340
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    • 2020
  • In this study, carbon aerogels (CA) were prepared by sol-gel polycondensation of resorcinol and furfural in isopropanol using hexamethylenetetramine as a catalyst, and then directly drying the organic gels under isopropanol freeze-drying conditions, followed by carbonization under a nitrogen atmosphere. The preparation conditions of the CA were explored by changing the mole ratio of resorcinol to furfural. The effect of the preparation conditions on the pore structure of the CA was studied by nitrogen adsorption isotherms. The characteristics of the CA were studied by scanning and transition electron microscopy, and infrared spectrometry. The accessibility of pores and performance of the CA as an electrode in electric double layer capacitors were also electrochemically investigated. As a result, BET surface area and specific capacitance increased with the molar ratio of resorcinol to catalyst (R/C) ratio; the maximum values of 765 ㎡/g and 132 F/g were achieved at the R/C ratio of 200, respectively. Consequently, it was confirmed that increasing the R/C ratio increased the average pore size of the CA electrode, which improved the rate capability of the system.

A Study on Characteristic of Hybrid PCS for Solar Power Generation Considering on a Residential Lithium Battery ESS. (가정용 리튬배터리 ESS를 고려한 태양광 발전 하이브리드 PCS 특성에 관한 연구)

  • Hwang, Lark-Hoon;Na, Seung-kwon;Choi, Byung-Sang
    • Journal of Advanced Navigation Technology
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    • v.26 no.1
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    • pp.35-45
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    • 2022
  • In this paper, we modeled the devices used easily in PV system circuits. In addition, for full operation of the photovoltaic system, a complete operation system for the DC-DC buck-boost converter and the MPPT control system was modeled and simulated to confirm good operation. we were constructed an actual system with the same conditions in the simulation and experimented. The purpose is to confirm the stable power supply through the load leveling by presenting the PCS considering ESS of photovoltaic power generation. we will do study to apply hybrid capacitors that have high energy density to the same size compared to the EDLC to DVR. As a result, we proposed a single-phase 3 kW grid-connected solar power converter.

Study on the Electrochemical Characteristics of a EGaIn Liquid Metal Electrode for Supercapacitor Applications (수퍼커패시터 응용을 위한 EGaIn 액체 금속 전극의 전기화학 특성 연구)

  • SO, JU-HEE;KOO, HYUNG-JUN
    • Transactions of the Korean hydrogen and new energy society
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    • v.27 no.2
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    • pp.176-181
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    • 2016
  • Recent years, supercapacitors have been attracting a growing attention as an efficient energy storage, due to their long-lifetime, device reliability, simple device structure and operation mechanism and, most importantly, high power density. Along with the increasing interest in flexible/stretchable electronics, the supercapacitors with compatible mechanical properties have been also required. A eutectic gallium-indium (EGaIn) liquid metal could be a strong candidate as a soft electrode material of the supercapacitors because of its insulating surface oxide layer for electric double layer formation. Here, we report the electrochemical study on the charging/reaction process at the interface of EGaIn liquid metal and electrolyte. Numerical fitting of the charging current curves provides the capacitance of EGaIn/insulating layer/electrolyte (${\sim}38F/m^2$). This value is two orders of magnitude higher than a capacitance of a general metal electrode/electrolyte interface.

A Study of Increasing Regeneration Energy and Braking Using Super Capacitor(EDLC) (슈퍼커패시터를 이용한 회생에너지 증대 및 제동에 관한 연구)

  • Kwon, Oh-Jung;Park, Chang-Kwon;Oh, Byeong-Soo
    • Transactions of the Korean Society of Automotive Engineers
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    • v.14 no.6
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    • pp.24-33
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    • 2006
  • This experiment explains about electrical braking equipment which will be used for 1.2kW PEMFC HEV. The equipment is made of BLDC motor and super capacitor(EDLC). The circuit is designed for regeneration braking that can save the energy from low voltage of generation with BLDC motor. Increasing a regeneration energy from braking system is effected with regeneration current and SoC of super capacitor(EDLC). Electrical braking in electrical vehicle is suitable for regeneration braking with dynamic braking together.

Influence of Oxygen-/Nitrogen-containing Functional Groups on the Performance of Electrical Double-Layer Capacitor (전기이중층 커패시터의 성능에 미치는 산소/질소 함유 관능기들의 영향)

  • Kim, Jieun;Kwon, Young-Kab;Lee, Joong Kee;Choi, Ho-Suk
    • Korean Chemical Engineering Research
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    • v.50 no.6
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    • pp.1043-1048
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    • 2012
  • In this study, activated carbons (ACs) were modified as electrode materials for an electric double layer capacitor (EDLC) by controlling oxygen- and nitrogen-containing functional groups. The morphological and chemical properties of ACs were analyzed through scanning electron microscopy (SEM), fourier transform infrared (FTIR) spectrometer, automatic elemental analyzer (EA) and Boehm titration. Also, charge/discharge tests were performed to investigate the EDLC performance. Oxygen- and nitrogen-containing functional groups were introduced on the surface of ACs through acid and urea treatments, respectively. ACs with nitrogen-containing functional groups showed 2 mA increase of gravimetric discharge capacity and quick achievement of maximum charge/discharge performance. However, ACs with oxygen-containing functional groups showed low discharge capacity and its gradual decrease during further cyclic test, since the functional groups interrupted adsorption/desorption of charges in the electrolyte on the surface of ACs.

A Study on the dynamic voltage restorer using hybrid capacitor (하이브리드 커패시터를 적용한 순간전압강하 보상장치에 관한 연구)

  • Seo, Ansik;Maeng, Jucheol;Yoon, Jungrag
    • Proceedings of the KIPE Conference
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    • 2013.11a
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    • pp.75-76
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    • 2013
  • 최근 산업 및 경제의 급속한 발전으로 컴퓨터를 비롯한 전기 및 전자 장비, 통신기기, 반도체 장비 등 전기적 외란에 민감한 부하 설비의 사용이 급증하면서 전력 품질에 대한 관심이 고조되고 있다. 그 이유는 정밀 부하 장비들이 전압의 순간적 변동에 대하여 민감하여 이 문제로 인하여 파생되는 경제적 피해가 매우 크기 때문에 지속적인 관리가 필요하다. 이러한 문제 중에서 가장 빈번하게 발생하는 순간 전압 강하를 보상하기 위한 장치로 전기 이중 층 커패시터 (EDLC: Electric Double Layer Capacitor)를 에너지 저장장치로 사용한 순간전압강하 보상장치 (DVR: Dynamic Voltage Restorer) 시스템이 개발 되어 적용되고 있다. 본 논문에서는 현재 순간전압강하 보상장치에 사용되는 DVR 시스템에서 주로 사용되는 에너지 저장장치인 EDLC 보다 동일 사이즈 대비 에너지 밀도가 높은 하이브리드 커패시터를 적용하는 연구를 하고자 한다.

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Characteristic Analysis of Parameters for Super-Capacitor Diagnostic (Super-Capacitor의 고장진단을 위한 파리미터의 특성 해석)

  • Shon, Jin-Geun;Kim, Young-Hyuk;Kim, Dong-Joon;Lee, Sang-Cheol
    • Proceedings of the KIEE Conference
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    • 2008.11b
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    • pp.74-76
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    • 2008
  • 본 논문에서는 Super-Capacitor라 불리우는 EDLC(전기이중층콘덴서)의 고장진단을 위한 파라미터의 특성 해석에 관한 연구를 수행하였다. 에너지의 저장 및 전압연계를 위한 전력변환장치에는 납측전지 또는 전해커패시터를 사용하여 왔으나 환경문제 및 에너지밀도의 측면에서 불리하여 최근에는 Super-Capacitor의 사용이 주목을 받고 있다. 본 논문에서는 이러한 EDLC의 내부 특성을 해석하기 위하여 EDLC의 등가직렬저항 및 정전용량을 측정하여 진단데이터에 활용이 가능토록 하였으며, 또한 EDLC를 적용한 순간전압 보상장치의 응용 실험을 수행하여 그 결과를 제시하였다.

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Preparation of Graphite Oxide and its Electrochemical Double Layer Capacitor's Performances using Non-Aqueous Electrolyte (TEABF4 & TEMABF4) (산화흑연의 제조 및 전해질(TEABF4 & TEMABF4)에 따른 전기이중층 커패시터의 특성)

  • Yang, Sunhye;Kim, Ick-Jun;Jeon, Min-Je;Moon, Seong-In;Kim, Hyun-Soo;An, Kye-Hyeok;Lee, Yun-Pyo;Lee, Young-Hee
    • Applied Chemistry for Engineering
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    • v.18 no.3
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    • pp.291-295
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    • 2007
  • The oxidation treatment of needle cokes with 70 wt% of nitric acid and sodium chlorate ($NaClO_3$) was attempted to achieve an electrochemically active material with a large capacitance. The structure of needle cokes was changed to graphite oxide after oxidation treatment of needle cokes with acidic solution having the composition ratio, $NaClO_3$/needle cokes, of 7.5, and the inter-layer distance of the oxidized needle cokes was extended to $6.9{\AA}$with increasing oxygen content. On the other hand, the electrochemical performance of oxidized needle cokes as a polarized electrode for an Electric Double Layer Capacitor (EDLC) was examined with an electrolyte of 1.2 M $TEABF_4$ (tetraethylammonium tetrafluoroborate) and $TEABF_4$ (triethylmethylammonium tetrafluoroborate) in acetonitrile. The capacitor cell using 1.2 M $TEABF_4$/acetonitrile has exhibited smaller electric resistance of $0.05{\Omega}$, and larger capacitance per weight and volume of 32.0 F/g and 25.5 F/mL at the two-electrode system in the potential range 0~2.5 V than that of the capacitor cell using $TEABF_4$. The observed electrochemical performance was discussed with the correlation between the inter-layer distance in graphite oxide structure and the anionic size of electrolyte.

The Electrochemical Characteristics of Mesopore Active Carbon Fiber for EDLC Electrode (EDLC 전극용 메조기공 활성탄소 섬유의 전기화학적 특성)

  • Kang, Chae-Yoen;Shin, Yun-Sung;Lee, Jong-Dae
    • Korean Chemical Engineering Research
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    • v.49 no.1
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    • pp.10-14
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    • 2011
  • The electrode material performances of electric double layer capacitor(EDLC) were investigated using mesopous active carbon fiber(ACF), which was prepared by the iron exchange method. The mesoporous ACF had pore characteristics of specific surface area around 1249, 664 $m^2$/g, mesoporous fraction around 70.6-81.3% and meanpore size around 2.78-4.14 nm. The results showed that as HNO3 treatment time decreased, the specific surface area increased and mesoporous fraction decreased. To investigate electrochemical performance of EDLC, unit cell was manufactured using mesoporus ACF, conducting material and binder; organic elctrolyte was used on this experiment. The specific capacitance of ACF treated with HNO3 for 2 hours turned out to be 0.47 $F/cm^2$and the results of the cyclic charge-discharge tests were stable. Thus, the electrochemical performance of EDLC was mainly dependent on specific surface area of ACF electrode and the diffusion resistance of charge decreased as the mesopore increased.