• Journal of international Conference on Electrical Machines and Systems
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• v.2 no.4
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• pp.466-472
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• 2013

The paper presents a novel DC grid connection topology and control strategy for doubly-fed induction generator (DFIG) based wind power generation system. In order to achieve the wind power conversion, the stator side converter and the rotor side converter is used to implement the DFIG control based on the indirect air-gap flux orientation, and a DC/DC converter is used for the DFIG system to DC grid connection. The maximum power point tracking and DC voltage droop control can also be implemented for the proposed DFIG system. Finally, a 4-terminal DFIG-based multi-terminal DC grid system is developed by Matlab to validate the availability of the proposed system and control strategy.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2001.11a
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• pp.135-138
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• 2001

Recently, ozone is utilized In various fields and its needs are expanding. therefore, so many ozone generation methods have been reported in the latest years, its main purpose Is to get the high ozone concentration and to improve the ozone yield. One of them is a plate-type ozone generator. In this paper, the plate-type ozone generator is piled up many folds(3 and 5 electrodes). Ozone concentration and yield were investigated in accordance with power, quantity of supplied gas and gap spacing of plate electrodes.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.56 no.4
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• pp.773-776
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• 2007

A microstructure array has been proposed for micro plasma generation using electroplating and double exposed process. A stable atmospheric plasma has been generated at a low voltage by utilizing the micro electrode gap. Self-aligned microstructure can provide uniform electrode overlap with precisely controlled gap between the electrodes. The proposed structure allows for triode operation, which can expand the generated plasma over a large area by applying a lateral electric field. Electrical characteristics of the micro triode confirm the large numbers of the plasma ions are drifted to the secondary cathode by the lateral electrical field.

• Journal of Korean Home Economics Education Association
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• v.15 no.1
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• pp.33-42
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• 2003

The Purpose of this study was to develop a lesson proposal about the aging for 7th glade middle school students in the class of home economics. According to this Purpose a lesson Proposal about the aging which contains 1) the nature of generation gap and generational conflicts and problem solving strategies. 2) knowledges about physical. emotional. and social changes of older adults and the process of aging. 3) informations of various order adult-related Professions was devised This proposal will be helpful for younger people to understand older adult much more and to Prepare the adolescents' future life as an older people. It is expected to have effects on decrease the generation gap and conflicts between older and younger people based upon mutual understanding. And it is anticipated that this Proposal will be valuable for many adolescents to have provision about future senior citizen's society and various older adults-related professions .

• Proceedings of the KIEE Conference
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• 2006.07a
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• pp.541-542
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• 2006

The dispersed generation is recently increased introduction for the energy supply rationalization and effective management of power system. But the dispersed generation causes to the various trouble that isn't occurred in the past, for example, the two way systems have an effect on the mistake action of protection equipment and the power quality. In this paper, we research the influence on the harmonic when the dispersed generation is interconnected with distribution system. To achievement, we construct the interconnecting dispersed generation and distribution system which is applied to the permission of harmonic emission. After that, we simulate about the harmonic of distribution system interconnection dispersed generation by the PSCAD/EMTDC analyzing transient state of the power system.

• 연구논문집
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• s.32
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• pp.5-13
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• 2002

This paper deals with the result of an analysis on the effect of the power generation by municipal solid waste(MSW)-refuse derived fuel(RDF) and the introduction of tipping fee sharing between RDF manufacturing and power generation project. As a model case for the MSW generated at small and medium cities in our country, an analysis of the RDF power generation and Tipping fee sharing shows that 1) MSW amount of 7,800* $10^3 $t/y could produce 1,950*$10^3$t/y of RDF 2) Electric power generated by MSW-RDF could supply 290,000 households/year and 98,548 C-t/y of $CO_2$ could be reduced. 3) Tipping Fee should be shared by the considering of the contents of project of both side between RDF Production and power generation.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 1994.04a
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• pp.741-741
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• 1994

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.15 no.6
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• pp.103-110
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• 2001

Recently, ozone is utilized in various fields and its needs are expanding. Therefore, so many ozone generation methods have been reported in the last year, its main purpose is to get the high ozone concentration and to improve the ozone yield one of them is a Co-axial cylinder-type ozonizer. In this paper, a new ozonizer, which is using radio-frequency power supply, is fabricated to investigate discharge characteristics and ozone generation characteristics in accordance wish variation of grip spacing of electrodes.

• Proceedings of the KIEE Conference
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• 1999.07e
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• pp.2259-2261
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• 1999

In this paper, an ozonizer, which can generate individual and superposed silent discharge, using three-phase voltage has been designed and manufactured. The ozonizer consists of 3 electrodes(Central Electrode, Internal Electrode and External Electrode) and 2 gaps(gap between Central Electrode and Internal Electrode, gap between Internal Electrode and External Electrode). Ozone is generated according to voltage supplying method to each electrode by individual silent discharge and three-phase superposed discharge. The characteristics of ozone generation were investigated with variation of discharge power and the quantity of supplied gas($O_2$). In case of individual silent discharge, the maximum values of ozone concentration, ozone generation and ozone yield were obtained between internal electrode and external electrode, and its values were 2300[ppm], 570[mg/h] and 745[g/kWh] respectively. Each maximum values was 5039[ppm], 1773[mg/h] and 851[g/kWh] respectively, when three-phase superposed silent discharge was employed. Therefore, characteristics of ozone generation with three-phase voltage are improved compared with single-phase voltage because silent discharge is generated continuously.

• Applied Science and Convergence Technology
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• v.25 no.6
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• pp.138-144
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• 2016

The discharge characteristics of pulse-driven coplanar micro barrier discharges for an ultraviolet (UV) light source using Ne-Xe mixture have been investigated using a two-dimensional fluid simulation at near-atmospheric pressure. The densities of electrons, the radiative excited states, the metastable excited states, and the power loss are investigated with the variations of gas pressure and the gap distance. With a fixed gap distance, the number of the radiative states $Xe^*(^3P_1)$ increases with the increasing driving voltage, but this number shows weak dependency on the gas when that pressure is over 400 Torr. However, the number of the radiative states increases with the increase of the gap distance at a fixed voltage, while the power loss decreases. Therefore, a long gap discharge has higher efficiency for UV generation than does a short gap discharge. A slight change in the electrode tilt angle enhances the number of radiative species 2 or 3 times with the same operation conditions. Therefore, the intensity and efficiency of the UV light source can be controlled independently by changing the gap distance and the electrode structure.