• Title, Summary, Keyword: DC GIL

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A Research on the Fault Current of DC distribution system considering Converter Characteristics (DC배전 시스템에서 컨버터 특성에 따른 수용가측 고장 영향 분석)

  • Yoon, Tae-Young;Byeon, Gil-Sung;Lee, Han-Sang;Jang, Gil-Soo;Chae, Woo-Kyu;Kim, Ju-Yong
    • Proceedings of the KIEE Conference
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    • pp.366-367
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    • 2011
  • The DC distribution system iis a new promising topologies in a field of future smart distribution system. This system has high efficiency and reliability. So it is expected that there would be an increase in the installation of DC distribution systems. In this paper, the parameter of the DC/DC converter impact on customer's the power quailty in the DC distribution system when the fault occurred. For the analysis, DC network to be modeled using PSCAD/EMTDC. The fault is occurred at phase A in secondary side of MTR which is AC system. Then compared voltage and power at the customer side by varying the capacity of capcitor in the DC/DC converter.

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A Study on the Korea DC Distribution system topologies and its fault characteristics (국내형 직류 배전시스템 제안 및 고장특성 분석)

  • Byeon, Gil-Sung;Lee, Han-Sang;Yoon, Tae-Young;Jang, Gil-Soo;Chae, Woo-Kyu;Kim, Ju-Yong
    • Proceedings of the KIEE Conference
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    • pp.486-487
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    • 2011
  • In this paper, a configurable DC distributiong system is being proposed considering national power systems conditions and a comparative analysis of the transient response of the contingencies is performed with the conventional AC systems. DC systems are evaluated as a promising next-generation distribution system that provides reliable operation through high efficiency of energy use and converter control. This paper discusses about the required elements for the national DC distribution system and has analysed the fault characteristics of the AC and DC distribution systems using PSCAD/EMTDC. According to the simulation results, the DC system has improved response, due to the DC/DC converter's charging/discharging characteristics, in terms of voltage and power system characteristics when compared to AC systems.

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Start-up In-rush Current Reduction Technique of Asymmetrical Half-Bridge DC/DC Converter for PC Power Supply (PC 파워 서플라이용 비대칭 하프브리지 DC/DC 컨버터의 초기 구동시 돌입전류 제거 기법)

  • Kim Jae-Kuk;Lee Sung-Sae;Oh Won-Sik;Kim Jung-Eun;Moon Gun-Woo;Gil Chang-Hyun;Cho Ja-Ryong
    • Proceedings of the KIPE Conference
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    • pp.251-253
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    • 2006
  • This paper presents a start-up in-rush current reduction technique of asymmetry half-bridge DC/DC converter for PC power supply. The proposed converter is composed center-tapped half-bridge converter with blocking capacitor. The proposed converter can reduce the severe in-rush current when the proposed converter is power up. The validity of this study is confirmed from the experimental results.

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Switching Noise Reduction of Bidirectional DC-DC Converter for Battery Charging and Discharging (배터리 충방전용 양방향 DC-DC 컨버터의 스위칭 노이즈 저감)

  • Seo, Bo-Gil;Kim, Ji-Hyun;Jung, Jae-Hun;Nho, Eui-Cheol;Kim, Heung-Geun;Chun, Tae-Won
    • Proceedings of the KIPE Conference
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    • pp.199-200
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    • 2014
  • 본 논문은 3상 인터리브드 양방향 DC-DC 컨버터를 다룬다. 전류 리플을 줄이기 위해 3상 인터리브드 방식을 이용하였으며 소프트 스위칭 조건을 확보하기 위해 DCM으로 동작한다. DCM동작시 발생할 수 있는 스위칭 노이즈를 저감하기 위하여 새로운 스위칭 기법을 제안하고 검증한다.

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Bidirectional DC-DC Converter for Electric Vehicle Emergency Rescue Mobile Chaging System (전기자동차 긴급구난용 이동식 충전시스템의 양방향 DC-DC 컨버터)

  • BAEK, Woon-Gil;LEE, Won-Hyeok;CHO, Choon-Ho;KIM, Tae-Woong;KIM, Sung-Gon
    • Proceedings of the KIPE Conference
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    • pp.331-332
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    • 2014
  • 본 논문에서는 전기자동차 긴급구난용 이동식 충전시스템에 절연형 양방향 DC-DC 컨버터인 DAB(Dual Active Bridge) 컨버터를 적용하여 시스템 안정성 향상과 함께 출력주파수를 높임으로서 수동소자의 용량을 줄일 수 있고 고효율성을 확보할 수 있으며, 이에 대한 유효성을 시뮬레이션 해석을 통해 검증한다.

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Self-Excited Buck-Boost DC-DC Converter (자려식 승강압형 DC-DC 컨버터)

  • Lee, Seong-Gil;An, Tae-Yeong
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.48 no.11
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    • pp.663-669
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    • 1999
  • This paper presents new self excited DC-DC converters such as Buck-boost type, Buck type and also non-inverting Buck-boost type. The proposed converters has the following advantages: simple topology, small number of circuit components, easy control method. Therefore, these converters are suitable for the portable appliances with battery source. It is especially suited for low power DC-DC conversion applications where non isolation output power is usually required. The steady state characteristics of proposed self exciting Buck-boost DC-DC converter are analysis and the result shows good agreement with experimental value. Furthermore the experimental results for 50W class self oscillating Buck-boost DC-DC converter have been obtained, which demonstrate the high efficiency and good performance.

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Bidirectional DC-DC Converter with Soft-Switching for Battery Charging and Discharging of Electric Vehicle (소프트스위칭 특성을 갖는 전기자동차 배터리 충방전용 양방향 DC-DC 컨버터)

  • Seo, Bo-Gil;Jung, Jae-Hun;Park, Hae-Young;Nho, Eui-Cheol;Kim, In-Dong;Kim, Heung-Geun;Chun, Tae-Won
    • Proceedings of the KIPE Conference
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    • pp.143-144
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    • 2013
  • 본 논문에서는 전기자동차 배터리 충방전용 3상 인터리브드 양방향 DC-DC 컨버터의 소프트 스위칭에 대해 다루었다. 양방향 DC-DC 컨버터의 한쪽 단자는 계통과 연결된 PWM 컨버터의 DC-link단과 연결되고, 다른 한쪽 단자는 배터리에 연결된다. 양방향 DC-DC 컨버터의 소프트스위칭에 대해 기술한 다음 인덕터의 권선 저항이 소프트 스위칭 동작에 미치는 영향을 분석하였으며, 시뮬레이션을 통하여 제안한 방식의 타당성을 검증하였다.

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Design and Test of ESS DC-DC Converter using Zinc-Bromine Redox Flow Battery for Stand-alone Microgrid (Zinc-Bromine 레독스 플로우 배터리를 이용한 독립형 마이크로그리드 ESS DC-DC 컨버터 설계 및 실증)

  • Choe, Jung-Muk;Ra, Sun-Gil;Han, Dong-Hwa;Lee, Yong-Jin;Choe, Gyu-Ha
    • The Transactions of the Korean Institute of Power Electronics
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    • v.19 no.2
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    • pp.106-115
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    • 2014
  • This paper proposes ESS DC-DC Converter using Redox Flow Battery (RFB) for stand-alone microgrid. Price, safety, expandability and dynamics are crucial in ESS. Reports show that Zinc-bromine (ZnBr) RFB is the best choice in ESS. Simple electrical ZnBr RFB model is obtained from charging test. DC-DC converter Inductor current-DClink Voltage model is proposed for the DC microgrid. For the controller design in z-domain, the K-factor method is by considering nature of the digital controller. The control performance has been verified with simulation and hardware experiments. Lastly 10kW DC microgrid using RFB test result is shown.

DC Fault Study in Point-to-Point HVDC Grid based on MMC VSC (MMC VSC 기반 Point-to-Point HVDC Grid에서의 DC 고장 분석)

  • Lee, Dong-Su;Kim, Ki-Suk;Jang, Gil-soo
    • Proceedings of the KIEE Conference
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    • pp.161-162
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    • 2015
  • 최근 세계적으로 전력계통의 대륙 간 연계나 신재생에너지, 분산전원의 계통 연계를 위해 HVDC(High voltage Direct Current)에 대한 연구가 활발히 진행되고 있다. 대용량, 장거리 송전이 필요한 경우 HVAC에서의 전력손실과 송전거리의 한계를 극복하기 위하여 HVDC가 새로운 대안으로 떠오르고 있으며, LCC(Line commutated Converter)와 VSC(Voltage Source Converter)의 기술발전이 비약적으로 이뤄지고 있다. 특히, DC Grid화를 위해서 유럽에서는 해상풍력을 연계한 Windfarm을 DC Grid화 하는 프로젝트가 활발히 진행되고 있다. 이러한 신재생 에너지의 계통 연계를 위해서 DC Grid가 본격적으로 논의가 되고 있고 관련분야에서는 기술개발을 앞다퉈 진행하고 있는 상황이다. DC Grid 구현을 위해 VSC HVDC가 최근 주목받고 있으며, VSC로 연계된 DC Grid의 AC 계통과의 연계를 위해 가장 필요한 것이 바로 DC 차단기라고 할 수 있겠다. 본 논문에서는 DC Grid의 고장분석을 위한 기초연구로써 MMC(Modular Multilevel Converter) VSC를 기반으로 한 Point-to-Point HVDC Grid에서의 DC 고장에 대한 분석을 실시하였으며 그 특징을 분석하였다.

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Switching Method of 3-phase Interleaved Bidirectional DC-DC Converter to Achieve High Efficiency in Wide Load Range (넓은 부하영역에서 고효율을 얻기 위한 3상 인터리브드 양방향 DC-DC 컨버터의 스위칭 기법)

  • Jung, Jae-Hun;Seo, Bo-Gil;Sun, Daun;Nho, Eui-Cheol
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.64 no.9
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    • pp.1306-1314
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    • 2015
  • This paper deals with a switching method of a three-phase interleaved bidirectional DC-DC converter to obtain high efficiency in wide load range. The proposed soft-switching method provides ZVS and ZCS at turn-on, and ZVS at turn-off of the switch as well as considerably reduced conduction loss in light load. Simulation and experiment are carried out with a bidirectional DC-DC converter having the power rating of 3 [kW], and those results show the validity of the proposed switching method.