• The Transactions of The Korean Institute of Electrical Engineers
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• v.64 no.5
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• pp.812-816
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• 2015

Recently, various monitoring systems have been proposed to detect interaction performance between trains and infrastructure, as well as, various techniques to improve the accuracy and performance of such inspection equipment in high speeds. Especially, it is important to predict electric noise of high speed trains due to its effect on detection system accuracy. In this paper, we analyze various types of electrical noise in electric vehicles to improve the accuracy of the detection module of the inspection car. In detail, analysis of electric noise of high speed railway is performed as a function of speed based on field tests that were carried out by HEMU-430X (Highspeed Eletric Multiple Unit - 430 km/h eXperiment).

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.2171-2172
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• 2011

Recently, while interests on supply of electric vehicles have increased there still are insufficient charging facilities. As a solution to this matter, using electric power grids that constantly retain about 30~50[%] residual power is being considered. Therefore proposed in this paper railway, is a method to establish a charging infrastructure to utilize railway DC power grids. In addition we designed a high-speed DC charging system, and simulated improvements of the charging structure's charging efficiency according to remaining capacity of batteries.

• Proceedings of the KIEE Conference
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• 2000.07b
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• pp.1442-1444
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• 2000

High speed switching action of PWM inverter is being further advanced for electric motor vehicles. Due to this high speed switching action, extensive high frequency electromagnetic noise emerges. Therefore counterm-easures against electromagnetic interference of electric motor vehicles become increasingly important. This paper describes the theory and countermeasure principle of EMI prevention and EMI test method for Korean Standard EMU.

• Proceedings of the KIEE Conference
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• 2006.10a
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• pp.176-177
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• 2006

The main aim of the paper is the study of the surge voltages in electric railway signal security system. Hence these studies will provide means of introducing a suitable protective device insulating transformer. This influences the surge voltage interrupting capacity using surge arresters and bypass capacitors. This circuit can be used for investigating surge phenomenon in electric railway signal security system. In this paper a insulating transformer has been introduced for the reduction of surge voltages in the above circuit model and performance evaluation.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.1169-1170
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• 2007

The primary objective of this paper is to examine the capacity of electrical transmission in electric railway according to the type of feeding system. Although supply capacity of railway substation are sufficient and there is no accident, due to the electrical transmission limit of feeding line the voltage breakdown may occur when large capacity of electric load at feeding line exist. So, using multi-port analysis model, we draw P-V curve due to feeding method, load, location and power factor of electric locomotive.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.2194-2195
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• 2011

The propulsion system of next generation electric vehicle is different from the structure and control methods compared with conventional induction motor vehicles by applying an interior permanent magnetic synchronous motor. Permanent magnet motor should be controlled by each individual motor, propulsion device have 1C1M structure by a single inverter to control a single motor.

• Proceedings of the KIPE Conference
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• 1998.10a
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• pp.955-960
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• 1998

Electrified railroads inject large amount of harmonics, negative sequence and reactive currents to electric supply systems. This paper introduces application of active filter as a 3/1 phase converter for electrified railroad. In this system active filter compensate harmonics, negative sequence and reactive currents and electric railroad and active filter together act as a balance three-phase load with power factor 1

• Proceedings of the KIEE Conference
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• 2005.07b
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• pp.1622-1624
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• 2005

In this paper, traction system of a double deck train were designed to examine technical reasonableness for driving on the ground and underground. Double deck trains operated in other countries were also considered. For designing the electric devices, two types of accelerations and electric devices arrangements which are based on the current subway system were considered.

• Journal of Electrical Engineering and Technology
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• v.12 no.5
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• pp.1789-1797
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• 2017

It is necessary to charge electric vehicles in order to drive them. Thus, it is essential to have electric vehicle charging facilities in place. In the case of a household battery charger, the power similar to that consumed by a household with a basic contract power of 3kW is consumed. In addition, many consumers who own an electric vehicle will charge their vehicles at the same time. The simultaneous charging of electric vehicles will cause the load to increase, which then will lead to the imbalance of supply and demand in the distribution system. Thus, a smart charging scheme for electric vehicles is an essential element. In this paper, simulated conditions were set up using real data relating to Korea in order to design a smart charging technique suitable for the actual situation. The simulated conditions were used to present a smart charging technique for electric vehicles that disperses electric vehicles being charged simultaneously. The EVs and Smart Charging Technique are modeled using the Electro Magnetic Transients Program (EMTP).

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.231-232
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• 2008

It's essential to evaluate harmonic characteristics of electric train because harmonics have negative effects on a main circuit of electric train, substations and communication system. So, we measured harmonics of electric train during test operating on conservational railroad, In the result, we can know relation between operation mode(acceleration, breaking operation and uniform speed operation) and harmonics.