• Proceedings of the KIEE Conference
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• 1997.07c
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• pp.751-753
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• 1997

The field test system covers three substation, 25 distribution feeders and 125 automated switches. Many small electric vendors participated in this project. Although each device is a small prototype, it was designed to carry out all of the functions. In performing the project, KEPRI has gained valuable experience, through dealing with many difficult problem. This paper is depicted about many kind of those difficult problems.

• Proceedings of the KIEE Conference
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• 2005.04a
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• pp.52-54
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• 2005

This paper describes an exciting current calculation method for transformers by finite element method. In case of a special case such as air-gap presence, one can not calculate exciting current accurately using exciting power curves due to flinging effect, magnetic saturation and so on. Transient analysis with external circuit is performed with a 2D model and compared to a test result.

• Proceedings of the KIEE Conference
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• 1998.07c
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• pp.887-889
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• 1998

This paper focuses on the simulation and ciontrol of the Unified Power Flow Controller (UPFC). This paper gives a brief outline of the initial results of the effect of the UPFC on the damping of the power system oscillations. The nonlinear simulation results show the effectiveness of each UPFC control variable and gives the future research direction.

• Proceedings of the KIEE Conference
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• 2005.07e
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• pp.88-90
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• 2005

There are a lot of troubles during the transfer of the source of electric power in UPS (uninterruptible power supply system) which is indispensable to the industrial equipments. They cause blackout accidents, resulting in a great economic loss. After measuring and analyzing the transient phenomena happening during the transfer, this paper presents the solution of the troubles. The solution can be used as a basic material for maintenance and it can minimize the troubles occurring in UPS and enhance the reliability of it.

• Proceedings of the KIEE Conference
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• 1995.07b
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• pp.531-534
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• 1995

This paper presents mathematical formulation of economic dispatch problem for power system considering cogeneration systems. For exact mathematical formulation, conceptual division technique is introduced. Simulation is conducted to power system including two cogeneration systems.

• Proceedings of the KIEE Conference
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• 2003.07a
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• pp.12-14
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• 2003

This paper describes 'XML Web Service' and we consider how it is applied to electrical power systems. Web is an interaction between users and web. But we must know that XML Web Service is an interaction between applications.

• Proceedings of the Korea Society for Simulation Conference
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• 2001.05a
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• pp.153-156
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• 2001

We have developed CNS(Compact Nuclear Simulator) which can be used for the fundamental training of the nuclear power plant operators. The application software for CNS consists of simulation engine(analyzer code), instructor station software, and man-machine interface software. Each application software is regarded as one black box and the communication of black boxes is performed by the predefined shared memory variables. In this paper, we discuss our experience for CNS development.

• Proceedings of the KIEE Conference
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• 2003.11a
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• pp.184-186
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• 2003

As STATCOM is considered to be installed in bulk power system, various studios are conducted to establish strategies for system operation considering STATCOM. This paper describes control strategy for coordinating STATCOM with existing switched shunt in bulk power system.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2006.05a
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• pp.225-227
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• 2006

Active power factor correction methods for electronic ballast are reviewed in this paper. PFC technology becomes more important due to various wattage ratings of new light sources. Expecially, most popular two method critical conduction mode and average mode, are described. Each characteristics are compared in relation to application target and power rating.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.60 no.5
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• pp.936-941
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• 2011

Generation cooperations have focused on active power directly related to economic value. So, utility cooperation have taken expense to stabilize power system, although generator has responded quickly with variation of power system voltage and is controlled at real time. As a reactive power source, it is necessary for generator's capabilities to be verified. But domestic generators scarcely have been tested and operated to reactive power capability. In case of power system fault, operators would not quickly take a follow-up actions about reactive power disturbance. Therefore generator reactive power capability verification strategy must be developed, several generators is tested as examples since 2004. This paper is extracted from the test results.