• 한국광학회지
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• 제13권2호
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• pp.146-150
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• 2002

본 연구에서는 광통신 시스템에 응용할 수 있는 장파장용 광 싸이리스터(optcal thyristor)를 제안하고, 소자를 제작하여 그 특성을 측정 분석하였다. 발광과 수광의 기능을 수행하는 광 싸이리스터는 광 네트워크 구성의 핵심 소자로서 충분한 스위칭 전압이 요구되는데, 단일 광 싸이리스터에서 충분한 스위칭 전압 4.03(V)와 홀딩 전압(holding voltage) 1.77(V)를 얻었다. 또한 입력 전류에 따른 수광에 필요한 충분한 광량을 얻을 수 있었고, 입사 광에 따른 비선형 I-V특성의 변화량을 확인 할 수 있었다. 실험적으로 얻어진 장파장용 DOT의 비선형적 특성은 일정한 진폭을 유지 시켜주는 광 하드 리미터(optical hard-limiter), ATM패킷 헤더 프로세싱을 위한 광 ATM 패킷 스위cld, 파장 분할 다중화(WDM) 광전송 시스템에서 파장 라우팅을 위한 파장 변환기 등의 많은 광통신 용용 분야에 적용할 수 있다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2011년도 제42회 하계학술대회
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• pp.794-795
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• 2011

The DC side voltage and current of a HVDC transmission system are directly affected by non-linear switching devices such as the thyristor valve which causes real power losses, even under the superconducting conditions of a high temperature superconducting (HTS) power cable. This paper deals with the development of miniaturized superconducting DC cable system. The authors designed and fabricated two thyristor converters for DC transmission system. One is operated as a rectifier and the other is an inverter. The HTS model cable was connected between the DC side of the rectifier and inverter. Real DC transport current and voltage were applied to the miniaturized HTS DC cable. Experimental results are discussed in detail.

• 한국산업융합학회 논문집
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• 제21권4호
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• pp.149-158
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• 2018

With the propagation and spread of the new regeneration energy and increase in electricity demand, power systems tend to be decentralized, and accordingly, the use of a power system stabilizer tends to expand for the stabilization of the distribution system. Thus, typical power system stabilizer, Static Var Compensator (SVC) is developed on a variety of topologies. In addition, the trend of technology leads from SVC to Static Synchronous Compensator(STATCOM) technology development. Recently, to overcome STATCOM's conversion losses and economic disadvantages, studies of a hybrid method using STATCOM and SVC in parallel have actively been conducted. This study proposes a new Soft-Step Switching method to limit inrush current problematic in Thyristor Controlled Capacitor (TCC) method in SVC function. In addition, to reduce Statcom's capacity, groups of reactive power compensation reactor and condenser for SVC were designed.

• 한국광학회:학술대회논문집
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• 한국광학회 2004년도 하계학술발표회
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• pp.26-27
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• 2004

We present the first demonstration of the vertical-injection depleted optical thyristor laster diode with InGaAs/InGaAsP multiple quantum well structure. The measured switching voltage and current are 3.36 V and 10 A respectively. The holding voltage and current are respectively 1.37 V, 100 A. The lasing threshold current is 131 mA at 25 C. The output peak wavelength is at 1578 nm at a bias current equal to 1.22 times threshold.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 추계학술대회 논문집 전기물성,응용부문
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• pp.74-76
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• 2005

수평형 에미터 스위치트 사이리스터(Lateral Emitter Switched Thyristor, LEST)의 고전압 전류 포화 특성을 위한 새로운 보호회로가 제안하였으며 성공적으로 제작 및 측정하였다. LEST의 부유(浮遊, floating) n+ 전압이 보호 MOSFET의 문턱 전압 보다 커지면 보호 회로는 LEST의 동작 모드를 regenerative 상태에서 non-regerative 상태로 전환시킨다. 일반적인 LEST의 전압 전류 포화 특성이 17 V로 제한되는 것에 비해 제안된 회로와 결합된 LEST는 200V 이상의 고전압 전류 포화 특성을 보였으며, Hard Switching Fault(HSF) 단락 회로 상황에서도 $10{\mu}s$ 이상 견디는 단락 회로 유지 능력을 보였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2015년도 제46회 하계학술대회
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• pp.155-156
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• 2015

Recently, electricity consumption has rapidly increased along with economic growth. The operating strategy using emergency generator is aimed, to resolve a demand response management. For strategy of peak shedding using emergency generator, it is essential to introduce the fast transfer switching device. One of the most effective solutions is to use a static transfer switch (STS) based on thyristor. However, the characteristic of natural commutated SCR thyristor should anticipate short duration voltage sag. STS system thus requires more than a quarter cycle to successfully complete transfer process. This paper proposes the operation scheme of the STS system using the forced-commutation technique to mitigate instantaneous voltage sag during peak transfer process. Proposed STS system improved turn-off characteristic thus accomplishes the peak load shedding satisfied power quality. Performance of the proposed STS system is evaluated using electromagnetic transient program (EMTP) to confirm the effectiveness.

• 조명전기설비학회논문지
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• 제17권1호
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• pp.45-53
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• 2003

본 연구에서는 프래쉬버트 용접에서의 용접성을 향상시키기 위하여 인버터를 대용량 시스템에 적용하여 타당성을 검증하였다. 제안된 시스템은 풀브릿지 인버터방식을 채택하고, DSP제어기를 사용하였다. 인버터시스템으로 동작 주파수를 향상시키면서 기존의 위상 제어형 용접기의 용접성과 비교하여 스패터가 저감되는 등 용접성이 개선되는 것을 여러 가지 금속학적인 방법들을 이용하여 확인하고, 인버터 시스템의 타당성을 검증하였다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 춘계학술대회 논문집
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• pp.918-923
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• 2011

On AC railway systems, the neutral sections are installed in front of substations and sectioning posts in order to avoid crash between power that have differing phases. In case railway vehicles pass through these neutral sections, it is necessary for them to switch to coasting driving by notch-off. This may reduce speed of the vehicles, resulting lowered train operation efficiency. The usage of automatic power switching systems makes it possible to pass neutral sections at notch-on, enhancing operation efficiency so that it is appropriate for high-speed railway applications. This paper introduces a simulator that assesses efficiency of automatic power switching systems in neutral sections. The is composed of a power supply system, electric railway vehicles, thyristor switches, and traction motors.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.244-246
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• 2006

This paper deals with an analysis of SCR thyristor switching pattern for a power quality disturbance generator with phase jump function. The proposed generator can be applied to the performance test of custom power devices. Voltage sag, swell, outage, unbalance and phase jump after outage are provided by the generator. The phase jump operating principle of the generator is described and analysed. Especially, a proper switching of the SCR thyristors for the proposed generator is important to guarantee the system reliability. Therefore the switching patterns for the thyristors in each made were analysed.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 제37회 하계학술대회 논문집 A
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• pp.16-17
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• 2006

In this paper, RCF analysis method which is very powerful to analyze non-continuous systems with switching elements is applied to small signal stability problems. As an effect of switching operations, the eigenvalues of system can be changed and newly unstable oscillation modes may be occurred. Also, changing firing angles of switching equipments may make the system stable or unstable. As an illustrating example, the oscillation modes of the system with different firing angles are computed by the RCF analysis method.