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Lee, Y.S.;Oh, K.T.;Ku, H.C.;Mok, H.S.;Hur, J.;Lee, K.Y.
- Proceedings of the KIPE Conference
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- 2007.11a
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- pp.79-81
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- 2007
본 논문에서는 소나용 고출력 전력증폭기의 효율을 향상시키기 위하여 Class E 설계 기법을 분석하고 소나 시스템의 송신기에 적용하였다. Class E 기법에 기반하여 전력소자를 스위칭 모드로 동작시켜서 Zero Voltage Switching(ZVS)이 발생하도록 회로를 설계함으로써 전력 소자의 전력 손실을 최소화하고 전력 증폭기의 효율을 최대화하여 주었다. 설계된 Class E 기법의 전력 증폭기의 동작 및 타당성을 시뮬레이션을 통하여 검증하였다.
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Jeong, S.H.;Choi, S.B.;Nam, K.Y.;Ryoo, H.S.;Lee, J.D.
- Proceedings of the KIEE Conference
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- 2005.07a
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- pp.396-398
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- 2005
IEC 60287-3-2 standards suggests the selection method of economic conductor size for power cables. This method deals solely with the economic choice of conductor size based on joule losses. This paper introduces the method and example study which is proposed by IEC standards.
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Kim, D.Y.;Lee, J.Y.;Kim, P.S.;Kook, K.S.;Oh, T.K.
- Proceedings of the KIEE Conference
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- 2000.07a
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- pp.262-264
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- 2000
This paper presents an effect of UPFC to the power system analysis. UPFC is equivalently represented as a synchronous condenser and load, while the active and reactive power of the specific transmission line and the voltage of the bus is scheduled appropriately. This procedure is implemented by IPLAN which is an application program in PSS/E. The simulation results show that UPFC is very effective to control the transmission line over-load and bus voltage variation.
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Cha, S.T.;Kim, Y.H.;Oh, S.I.;Choi, J.H.;Shin, J.H.;Shim, E.B.;Kwak, N.H.;Son, H.I.
- Proceedings of the KIEE Conference
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- 2007.07a
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- pp.473-474
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- 2007
The Jeju power grid experienced several major power disturbances over the last decade. The postmortem studies of the incidents indicated that some of the generating units did not respond as predicted by system analysis & studies. Consequently, the Korean Power Exchange (KPX) mandated that all units (generators, excitation, governor and turbine systems) in the Korean network greater than or equal to 20MVA be tested to verify the generator reactive power limits as well as the dynamic model data being used for system studies. This paper presents field experiences of the authors in testing and modeling of steam turbines and their associated governors during the generator and model validation.
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Kim, C.K.;Park, M.K.;Kim, S.J.;Lee, J.M.;Kweon, S.M.;Nam, J.H.
- Proceedings of the KIEE Conference
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- 2003.07d
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- pp.2215-2217
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- 2003
In this paper we describe a Control Rod Control System(CRCS) with the various functions for the test and operation of Control Rod Drive Mechanism(CRDM). The CRCS controls the motion of the full length rod drive mechanisms in response to signals from the Reactor Operator and the Reactor Regulating System. The mechanisms are grouped and identified as being for either Shutdown Banks or Control Banks. The CRCS also provides information regarding rod motion, rod position, and status of the Rod Control System. Also we have implemented the diverse functions in the developed CRCS. Due to the developed CRCS, we are assured that the commercial operation by this system be made before long.
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