• Title/Summary/Keyword: Inverse Current Injection Method

Search Result 4, Processing Time 0.036 seconds

An Improved Topology of DC Circuit Breaker Based on Inverse Current Injection Method (역전류 주입방식기반의 DC차단기의 개선된 토폴로지)

  • Cho, Young-Bae;Son, Ho-Ik;Kim, Hak-Man;Kwak, Joosik;An, Yong-Ho
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.63 no.11
    • /
    • pp.1491-1496
    • /
    • 2014
  • VSC-HVDC system is vulnerable to a DC fault because the fault current can be injected from AC system to DC system during the fault. Therefore, DC circuit breaker is required to isolate faults in VSC-HVDC system. The inverse current injection method of circuit breaker has been considered as DC circuit breaker. However, the topology has drawback that the breaking time is longer than hybrid circuit breaker using semiconductor devices. In order to solve this problem, this paper proposes an improved topology of circuit breaker based on inverse current injection method. In addition, the proposed topology will be compared with the existing topology. And we will verify its effects by using the simulation results.

Interruption Techniques of Inverse Current Injection Type of HVDC Circuit Breaker (역전류 주입방식 초고압 직류차단기의 차단 기술)

  • Lee, B.Y.;Chung, J.K.;Park, K.Y.;Shin, V.J.
    • Proceedings of the KIEE Conference
    • /
    • 1999.07a
    • /
    • pp.92-94
    • /
    • 1999
  • This paper describes the interruption techniques of HVDC circuit breaker which adapts inverse current injection method. A representative circuit configuration of this type of HVDC circuit breaker is presented and its operational mechanism and timing diagrams are investigated.

  • PDF

Current Reference Adjustment Method Using Null Space Vector Injection in Magnetic Manipulation System (Null space 전류 벡터 주입을 통한 자기장 합성 시스템 전류 지령 수정방법)

  • Hong, Jin-Su;Lee, Jun;Ha, Jung-Ik
    • Proceedings of the KIPE Conference
    • /
    • 2017.11a
    • /
    • pp.41-42
    • /
    • 2017
  • 기존의 다중 코일을 이용한 소형 자성체를 제어하는 시스템에서 전류 벡터 지령은 구동 매트릭스의 pseudo-inverse를 사용하여 계산되었다. 본 논문에서는 기존의 전류 지령에 null space 전류 벡터 지령을 더하는 방법을 이용하여 현재 전류 벡터값과 목표 전류 벡터 지령 사이의 전류 변화량이 최소화 되는 전류 지령 수정 방식을 제안한다. 제한된 전압 정격 내에서 제안된 방식을 적용할 경우 전류 지령 벡터값에 도달하는 시간이 짧아짐으로, 기존 방식에 비해 빠른 반응성을 얻을 수 있다. 제안된 방법은 Matlab(R) Simulink(R)를 통해 검증하였다.

  • PDF

Injection Characteristics Evaluation of Conductive Grout Material According to Carbon Fiber Mixing Ratio (탄소섬유 배합비에 따른 전도성 그라우트 재료의 주입특성평가)

  • Hyojun Choi;Wanjei Cho;Hyungseok Heo;Teawan Bang;Chanyoung Yune
    • Journal of the Korean GEO-environmental Society
    • /
    • v.24 no.1
    • /
    • pp.15-23
    • /
    • 2023
  • The grouting method is a method of construction for the purpose of waterproofing and reinforcing soft ground. When grout is injected into the ground, there are various types of penetration and diffusion of grout depending on the shape of the ground, the size of soil, the porosity, and the presence or absence of groundwater. the current situation. Therefore, in this study, to investigate the penetration performance of the grouting to conductive material, laboratory tests were performed on the addition of the conductive material. In the injection test, 0%, 3%, and 5% of the mixed water were added as conductive materials to the grout, and the original ground condition was composed of various types of ground composed of gravel and silica sand. Conductive grout is injected by pressure into the model ground using a dedicated injection device, and the injection time (t), pressure (p), flow rate (v) and injection amount (q) are measured, and the hardened body injected in the model ground is collected. Penetration performance was evaluated. In the results of the grout injection experiment, the amount of conductive material used and the grout injection rate showed an inverse relationship, and it was confirmed that the penetration pattern was changed according to the size of the soil particles in the model ground. The grout containing the conductive material has relatively good penetration into the ground and excellent strength and durability of the hardened body, so it was judged that it could be used as an additive for measuring the penetration range of the grout.