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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
Journal Basic Information
Journal DOI :
The Korean Institute of IIIuminating and Electrical Installation Engineers
Editor in Chief :
Volume & Issues
Volume 18, Issue 6 - Nov 2004
Volume 18, Issue 5 - Sep 2004
Volume 18, Issue 4 - Jul 2004
Volume 18, Issue 3 - May 2004
Volume 18, Issue 2 - Mar 2004
Volume 18, Issue 1 - Jan 2004
Selecting the target year
Development of Internet Web - based RADIANCE Rendering System : I. Establishment of the Luminaire Database
Choi, An-Seop ; Lee, Jung-Eun ; Oh, Eun-Suk ; Song, Kyoo-Dong ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 18, issue 5, 2004, Pages 1~8
DOI : 10.5207/JIEIE.2004.18.5.001
In the present, most lighting simulation programs are based on luminaires data produced at overseas. Currently, it is difficult to use proper domestic luminaire database in most lighting simulation programs, because there are only oversea luminaire database available. Therefore, in this study, domestic luminaire database were developed and categorized, and applied to Internet Web-based RADIANCE rendering system. Luminaire database are constructed with 3D modeling, materials, and IES candlepower distribution data of each luminaire.
The Development of Electric Ballast for a Instant Start/Restart of Metalhalide Lamp
Kim, Su-Kyoung ; Jang, Woo-Jin ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 18, issue 5, 2004, Pages 9~15
DOI : 10.5207/JIEIE.2004.18.5.009
The most shortcoming of metalhalide lamps is what the instant restarting cannot be realized when the arc tube is in the hot condition. The discharge starting voltage of arc tube in the hot condition is much higher than in the cold condition. Therefore it takes about five minutes to restart the metalhalide lamps, that is to say, it is possible to start when the pressure and the temperature are decreased. But, if the lamp is restarted in the hot condition, we must supply the high voltage pulse with 20[kV] at the both electrode of lamp. The proposed electronic ballast is consist of a electromagnetic interference(EMI) filter, a power factor correction(PFC) circuit, a flyback converter, a half-bridge inverter, and a high voltage igniter circuit. By this composition we can start/restart the lamp with the voltage 20[kV], even if the lamp is in the hot condition.
Light Pollution Survey of Outdoor Lighting in Shopping Complex
Ahn, Hyun-Tae ; Kim, Jeong-Tai ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 18, issue 5, 2004, Pages 16~26
DOI : 10.5207/JIEIE.2004.18.5.016
As the importance of outdoor lighting become more widely recognized, outdoor lighting has been installed in many buildings, plazas, landscape, and historical monuments in Korea, Outdoor lighting on showing complex, in particular, express its values as local landmarks. However, the excessive outdoor lighting in the large-scale shopping complex tends to cause light pollution. Many advanced countries are trying to create a comfortable lighting environment by the guidlines and regulations on outdoor lighting to prevent light pollution. For this research backgrounds, the light pollution of three showing complexes in Seoul have been investigated. For the purpose, luminance of building facade, horizontal illuminance, and vertical illuminance were measured with proper measurement instruments and compared the results with the CIE recommendations. The results of the study are as follows. As no cut-off luminaries are currently installed on pedestrian walks, some glare were occured partially. It also shows that the luminance of building facades are high to improve the degree of public awareness of buildings and advertisements. In other words, the luminance of the building facade, when compared with that of the CIE recommendations, is twice as high and the vatical illuminance of pedestrian walks is far higher than that of the CIE recommendations, which proves the existence of light pollution. As Korea has not yet provided proper regulations or guidelines for the control of light pollution, it is necessary to make appropriate codes for it.
A Design of Electronic Ballast for 400[W] High Pressure Sodium Lamp Using IsSPICE
Kong, Eung-Seok ; Shin, Dae-Chul ; Choi, Choung-Moon ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 18, issue 5, 2004, Pages 27~34
DOI : 10.5207/JIEIE.2004.18.5.027
In this paper, we designed the electronic ballast for the 400[W] hight pressure sodium lamp using the half-bridge inverter Inductance and capacitance in the proposed equivalent LC series resonant circuit are calculated theoretically. We performed the simulation of the LC series half-bridge inverter circuit using the IsSPICE and the electronic ballast for the high pressure sodium lamp were implemented for verifing the simulation results. In the experimental results, the specification of the implemented electronic ballast are almost same with the simulated one. The experimental results show the good performance as PF 99.3[%],
10.01[%], lamp efficiency 119[lm/W] at the output 400[W].].
Study on RF Plasma Modeling Between Unequal-Sized Electrodes Using One-dimensional Fluid Method
So Soon-Youl ; Lim Jang-Seob ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 18, issue 5, 2004, Pages 35~41
DOI : 10.5207/JIEIE.2004.18.5.035
In computational study on RF(Radio Frequency) plasmas, a 1D fluid models with an advantage of a short computational time are often adopted. However, in order to obtain realistic calculation results under a typical chamber geometry with unequal-sized electrodes, modeling of the plasma space is an issue to be investigated. In this paper, it is focused on that how much a 1D model can approximate a 2D model. 1D fluid models with unequal-sized electrodes, which have spherical and frustum geometry systems, were developed and their results were compared with those of 2D model with Gaseous Electronic Conference cell structure. Behavior of
RF plasmas has been simulated using 1D and 2D fluid models and a technique to take account of unequal-sized electrodes in a 1D fluid models has been examined. Features of the plasma density and the electric potential were discussed as characteristic quantities representing the asymmetry of the chamber geometry.
An Improvement of the Gas Discharge Structure of the AMD Gate PDP
Ryeom, Jeong-Duk ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 18, issue 5, 2004, Pages 42~47
DOI : 10.5207/JIEIE.2004.18.5.042
This research has improved the problem of discharge AND gate PDP proposed before. The polarity of the DC discharge which composes AND gate is reversely designed and the cross talk problem to the adjacent scanning electrode has been improved. The AND gate proposed before operated by using non-linearity of the discharge by the space charge. In this research, new discharge NOT logic in which it was used that an applied voltage changed with the discharge circuit was added to AND gate. AND gate came to operate more stably. A selective address was able to be discharged with four horizontal scanning electrodes from the experiment result. The operation margin of the AND gate discharge obtained 34V and of the address discharge obtained 70V.
Development of Spectral Irradiance Measurement System
Seo, Jung-Chul ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 18, issue 5, 2004, Pages 48~53
DOI : 10.5207/JIEIE.2004.18.5.048
Spectral irradiance measurement system was developed to measure the spectral irradiance of optical sources in the wavelength range from 250[nm] to 1600[nm]. Our system is composed of source system, fore-optics, monochromator system, optical detector system, and automatic control system. Optical detector system with PMT, Si, InGaAs, and IR enhanced InGaAs detectors is used to measure the wide spectrum of optical sources in ultraviolet visible, and infrared wavelength regions. Spectral irradiance of the 1[kW] quartz-halogen tungsten lamp was measured and compared in the wavelength range from 250[nm] to 1600[nm]. The differences between our results and those reported by NIST are below 3[%], 3.5[%], and 5[%] in the wavelength range of 450∼700[nm], 700∼1600[nm], 250∼400[nm], respectively.
A Study on the Analysis and Application of Neutral Line Zero Sequence Currents Reduction Device in Commercial Facility Loads
Kim, Kyung-Chul ; Lee, Il-Moo ; Paik, Seung-Hyun ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 18, issue 5, 2004, Pages 54~60
DOI : 10.5207/JIEIE.2004.18.5.054
With the proliferation of nonlinear loads such as commercial facilities in all of modern society high neutral harmonic currents have been observed. High neutral currents in three-phase four-wire distribution systems can cause lots of harmonic problems. The most common solution of neutral harmonic currents reduction is a zero phase sequence filter using zig-zag transformer. This paper analyzes a commercially available neutral line zero sequence currents reduction device and applies the equipment to commercial office loads for eliminating harmonics. Experimental results m compared numerically and graphically with simulation results through the use of MATLAB.
A Design of Power Converter for Fuel Cell Controlled by Micro-Processor
Won, Chung-Yuen ; Jang, Su-Jin ; Lee, Won-Chul ; Lee, Tae-Won ; Kim, Soo-Seok ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 18, issue 5, 2004, Pages 61~68
DOI : 10.5207/JIEIE.2004.18.5.061
Recently, a fuel cell is remarkable for new generation system. The fuel cell is characterized by low voltage and high current. Therefor, for connecting to general load, it needs both a step up converter and an inverter. The proposed system consists of an isolated DC-DC converter to boost the fuel cell voltage to 380[Vdc] and a PWM inverter with LC filter to convert the dc voltage to single phase 220[Vac]. Also, bi-directional DC-DC converter for fuel cell generation system is composed to improve load response characteristic. In this paper, full bridge converter and the single phase inverter are designed and installed for fuel cell. Simulation and experiment verify that fuel cell generation system could be applied for the distributed generation.
Performance Comparison of Signal Reference Grid and Insulated/Isolated Ground Using HIFREQ Simulator
Paik, Seung-Hyun ; Kim, Kyung-Chul ; Choi, Jong-Ki ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 18, issue 5, 2004, Pages 69~73
DOI : 10.5207/JIEIE.2004.18.5.069
This paper deals with the transient performance of zero signal reference grid(ZSRG) and insulated/isolated ground(IG) in case of lightning strike or surge currents in buildings. Using HIFREQ, which is a commercial code for electromagnetic field analysis, the difference of transient performances of ZSRG and IG type grounding structure have been presented based on the numerical calculations. It is expected that the quantitative and numerical calculation based analysis, which is adopted in this paper, will attribute to the selection of optimal grounding method in the intelligent buildings.
Speed Control of Permanent Magnet Synchronous Motor for Elevator
Won, Chung-Yuen ; Yu, Jae-Sung ; Kim, Jin-Hong ; Jun, Bum-Su ; Hwang, Sun-Mo ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 18, issue 5, 2004, Pages 74~82
DOI : 10.5207/JIEIE.2004.18.5.074
This paper describes the speed control of the surface-mounted permanent-magent synchronous motors (SMPMSNM) for elevator drive. The elevator motor needs to be a compact and slim type. Essentially, the proposed scheme uses a vector control algorithm for a speed and torque control and Anti-windup technique is adopted to prevent a windup phenomenon. This system is implemented using a high speed 32-bit DSP (TMS320C31-50), a high-integrated logic device FPGA(EPF10K10TI144-3) to design compactly and inexpensively. The proposed scheme is verified by the results through digital simulation and experiments for a three-phase 13.3[kW] SMPMSM as a MRL(MachineRoomLess) elevator motor in the laboratory.
Database Construction to Compute Representative Model of Load Power Factor in Bulk Power System
Cho, Jong-Man ; Lee, Hyo-Sang ; Lee, Jung-He ; Kim, Jin-O ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 18, issue 5, 2004, Pages 83~89
DOI : 10.5207/JIEIE.2004.18.5.083
The importance of the Load Power Factor(LPF) management is newly noticed from the voltage management and operation of the power system due to the rapidly increasing reactive power consumed. Therefore, this paper proposes the regional, seasonal and hourly Representative Model of Load Power Factor(RMLPF) considering load characteristics of all 154/22.9[kV] substations. The RMLPF is used to present a precision improvement of power system analysis and security. Computation of representative model of load utilizes the average flow method based on moving average method. The Energy Management System(EMS) data are used as the source to assess the load power factor.
Characteristics of Radiated Electromagnetic Wave and Partial Discharge in Power XLPE Cable
Lee, Kwang-Sik ; Lee, Hyun-Chul ; Park, Kwang-Seo ; Yoon, Dae-Hee ; Lee, Sang-Hun ; Kim, Jong-Hwan ; Kim, Chung-Nyun ; Kim, Ki-Chai ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 18, issue 5, 2004, Pages 90~95
DOI : 10.5207/JIEIE.2004.18.5.090
This paper simulated partial discharge caused by 22.9[kV] power cable using XLPE(Peroxide Crosslinkable Polyethylene) insulation having the outside damage. As one of the insulation diagnostic method a radiated electromagnetic waves were measured by an UHF method using a BiconiLog antenna(EMCO-3142) and a spectrum analyzer used to measure EMI, EMC. From results of this study, It was confirmed that discharge Ogress were possible to be estimated by the proposed method.
Regeneration Inverter System for DC Traction with Hormonic Reduction Capability
Won, Chung-Yuen ; Jang, Su-Jin ; Kim, Yong-Ki ; Bang, Hyo-Jin ; Song, Sang-Hun ; Ahn, Kyu-Bok ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 18, issue 5, 2004, Pages 96~104
DOI : 10.5207/JIEIE.2004.18.5.096
This paper proposes a dc power regenerating systems, which can generate the excessive dc power from dc bus line to ac supply in substations for traction system The proposed regeneration inverter system for dc traction can be used as both an inverter and an active power filter(APF). As an regeneration inverter mode, it can recycle regenerative energy caused by decelerating tractions and as an active power filter mode, it can compensate for harmonic distortion produced by the rectifier substation. From the viewpoint of both power capacity and switching losses, the system is designed on the basis of three phase PWM inverters and composed of parallel inverters, output transformers, and an LCL filter.
Short-term Reactive Power Load Forecasting Using Multiple Time-Series Model
Lee, Hyo-Sang ; Cho, Jong-Man ; Park, Woo-Hyun ; Kim, Jin-O ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 18, issue 5, 2004, Pages 105~111
DOI : 10.5207/JIEIE.2004.18.5.105
This paper shows that active and reactive power load have significant positive relationship and there exist two types of relationship between them using Test Statistics. In investigating the cross plots at every hour, we found out that from 0 to 8 hours, there relationships are linear, while from 9 to 23 hours, they are two piece-wise linear. Also, reactive power loads was estimated and forecasted using active power load as the explanary variable with OLS (Ordinary Least Squares) regression methods. MAPE (Mean Absolute Percentage Error) for each model is calculated for one-hour ahead forecasting.
Statistical Characteristics of the Electromagnetic Pulses Radiated from Intracloud Discharges
Lee, Bok-Hee ; Jeong, Dong-Cheol ; Lee, Dong-Moon ; Ahn, Chang-Hwan ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 18, issue 5, 2004, Pages 112~117
DOI : 10.5207/JIEIE.2004.18.5.112
In this paper, in order to obtain the detailed information about lightning electromagnetic pulses, the electromagnetic pulses radiated from intracloud discharges were measured, and their characteristics and waveform parameters were analyzed statistically. The electromagnetic pulses produced by intracloud discharges are distinctly different with those by lightning return strokes. The zero-crossing times and the full pulse widths of the large bipolar electromagnetic pulses are gradually decreased as the stroke proceeds. Also, the electromagnetic pulses tend to be bipolar, with narrow and fast leader pulses superimposed on the initial half cycle. The mean numbers of leader pulses superimposed on the initial half cycle were 1.61
0.74 and 1.75
0.73 for the positive and negative polarities, respectively.
Harmonics Analysis for Electric Arc Furnace According to the Operation Condition
Kim, Jae-Chul ; Park, Kyung-Ho ; Park, Hyun-Teak ; Moon, Jong-Fil ; Im, Sang-Kug ; Son, Hag-Sig ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 18, issue 5, 2004, Pages 118~125
DOI : 10.5207/JIEIE.2004.18.5.118
The use of electric arc furnace has been increasing as the steel consumption is increasing and the operation technique of electric arc furnace are developing. But as the use of electric arc furnace is increased, the furnace have produced the adverse effects of power quality: voltage and current harmonics, voltage and current imbalances, low power factor, and voltage flicker. One of the power quality problems, the harmonic have the characteristics of the time-varying and non-linear. This paper analyzed the harmonics for the various operation conditions of electric arc furnace. The power system model with electric arc furnace have been made, and the harmonic`s effects on the power system has been analyzed according to the various operating conditions, first melting, second melting, so on. Also, the filter reducing the harmonic components have been designed and its effects on the power system have been examined.
A Study on the Interferometer Configuration for Improvement of Signal-to-Noise Ratio of Optical Coherence Tomography System
Yang, Sung-Kuk ; Park, Yang-Ha ; Chang, Won-Suk ; Oh, Sang-Ki ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 18, issue 5, 2004, Pages 126~131
DOI : 10.5207/JIEIE.2004.18.5.126
As a noninvasive imaging method, optical coherence tomography system has been extensively studied because it has some advantages such as imaging of high resolution, low cost, and compact size configuration. In order to improve the SNR of OCT system, two types of interferometers were configured and then, we compared simulation with measurement of reference sample. In the OCT system is configured with Michelson interferometer, the contrast of cross-sectional image is reduced with low SNR detection which is due to loss of feedback interference signal from light source part. Also, in order to image measured data with real time, image processing program is constructed. From results of simulation, it is confirmed that improved Michelson interferometer is improved about 10[dB] with a 50 : 50 fiber coupler. And from the measurement of reference sample, about 5[dB] is improved with a 50 : 50 fiber coupler. It is confirmed that the OCT system is configured with the improved Michelson interferometer which has a good distinctive cross-sectional image due to higher contrast.
Leakage Currents Flowing through Lightning Surge Arresters under Various Fault Conditions in Receiving and Distribution Power Systems
Lee, Bok-Hee ; Kil, Hyeong-Joon ; Kang, Sung-Man ; Choi, Hwee-Sung ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 18, issue 5, 2004, Pages 132~139
DOI : 10.5207/JIEIE.2004.18.5.132
Unsymmetrical faults are classified into single line-to-ground faults, line-to-line faults, or double line-to-ground faults in receiving and distribution power systems. Many of overhead distribution-line faults are single line-to-ground faults, and lightning surge arresters are stressed by system frequency overvoltages due to unsymmetrical faults. In this work, the unsymmetrical faults in receiving and distribution systems were experimentally simulated, and the characteristics of total leakage current flowing through lightning surge arresters due to various unsymmetrical faults were investigated. As a result, a little variations of the leakage current flowing through Zinc oxide (ZnO) surge arresters in the range of
10[%] voltage regulations were observed. It could be concluded that the unsymmetrical faults have no effect on the long-term life performance of ZnO surge arresters in effective grounding systems. On the other hand, the magnitude of the leakage current flowing through ZnO surge arrester elements under single line-to-ground faults was more than 140 times as compared with that under normal operating voltages in ineffective grounding systems. But abnormal voltages caused by line-to-line faults and double line-to-ground faults have a little effect on total leakage current of ZnO surge arrester elements.
Operational Characteristics of DC Reactor Type SFCL for Accident of Both Power Source Side and Load Side
Lee, Su-Won ; Lim, Sung-Hun ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 18, issue 5, 2004, Pages 140~145
DOI : 10.5207/JIEIE.2004.18.5.140
In this paper, we analyzed the operational characteristics of the modified DC reactor type SFCL and derived the design condition of superconducting coil to be operated properly as power source as well as fault current limiter. It was confirmed through the simulation for the operation of this SFCL that the modified DC reactor type SFCL could be operated as both the uninterruptible power supply and the fault current limiter by controlling the duty ratio of GTO thyristor bridge.
Characteristics of Non-thermal Plasma Generation by Duty Ratio and Frequency of Pulse Voltage
Park, Seung-Lok ; Kim, Jin-Gyu ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 18, issue 5, 2004, Pages 146~150
DOI : 10.5207/JIEIE.2004.18.5.146
The effects on non-thermal plasma generation by duty Ratio and frequency of pulse voltage were investigated experimentally. For these, a new type of non-thermal plasma generator with mesh electrode was manufactured and it was possible to generate the surface and silent discharge simultaneously by new type of non-thermal plasma generator. Duty ratio and frequency were selected as main parameters to control the movement of electron which is mainly related to the non-thermal plasma generation. The characteristics of non-thermal plasma generation were investigated indirectly by measuring the I-V curve and quantity of ozone generation. The most effective condition of duty ratio and frequency to generate the non-thermal plasma was identified by experiments with manufactured non-thermal plasma generator.
ACPR Analysis of Millimeterwave OFDM System with Power Amplifier`s Phase Distortion
Roh, Hee-Jung ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 18, issue 5, 2004, Pages 151~155
DOI : 10.5207/JIEIE.2004.18.5.151
Millimeterwave OFDM wireless LAN system has been modeled for ACPR analysis. With simple AM-to-PM modeling for power amplifier and system simulation technique, power amplifier ACPR is simulated for OFDM modulation, Also, amplifier back-off value satisfying the required ACPR and the ACPR degradation have been predicted with the measured and modeled AM-tn-PM distortion.
A Characteristics on Water Quality Analysis Used the High-Voltage Discharge
Cho, Kook-Hee ; Kim, Young-Bae ; Cho, Moon-Soo ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 18, issue 5, 2004, Pages 156~161
DOI : 10.5207/JIEIE.2004.18.5.156
In this research, we used discharge tube without dielectric bead or with dielectric beads(SiO
, or ZrO
), and discharge in water at High-voltage pulse
DC power supply for removal of Escherichia coli. At the result of experiments, the removal characteristics of Escherichia coli appeared relation ratio to input voltage. Because, the electric field of discharge tube is increased when input voltage is increased. And, discharge tube used dielectric bead(ZrO
), the removal characteristics of Escherichia coli was better than cases of else. And discharge used DC Power, the removal characteristics of Escherichia coli was better than AC Pulse Power.
Service Restoration In Distribution Networks Using Cyclic Best-First Search
Choi, Sang-Yule ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 18, issue 5, 2004, Pages 162~168
DOI : 10.5207/JIEIE.2004.18.5.162
Service restoration is an emergency control in distribution control centers to restore out-of-service area as soon as possible when a fault occurs in distribution networks. Therefore, it requires fast computation time and high quality solutions for load balancing. In this paper, a load balance index and heuristic guided best-first search are proposed for these problem. The proposed algorithm consists of two parts. One is to set up a decision tree to represent the various switching operations available. Another is to identify the most effective the set of switches using proposed search technique and a feeder load balance index. Test results on the KEPCO`s 108 bus distribution system show that the performance is efficient and robust.
Effects of HTS Cable Applied to the Voltage Stability Limited Power System
Lee, Geun-Joon ; Hwang, Si-Dol ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 18, issue 5, 2004, Pages 169~173
DOI : 10.5207/JIEIE.2004.18.5.169
This paper presents the basic application idea of superconductor cable for voltage stability limited power system. In bulk power system, the transfer capability of transmission line is often limited by the voltage stability, and superconductor cable could be one of the countermeasure to enhance heat transfer limit as well as voltage stability limit. Steady state voltage stability approach by P-V curve is used to calculate the maximum transfer capability of initial system and superconductor applied system. IEEE-14 bus system is used to demonstrate its applicability.
The Analysis of Parallel Operating Characteristics for DC-DC Converter Using the Parallel Operation Model
Kim, Soo-Seok ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 18, issue 5, 2004, Pages 174~182
DOI : 10.5207/JIEIE.2004.18.5.174
Consideration for parallel operation in a high power system has been increased due to the advantages of parallel operation like as high productivity, simplicity of design, and redundancy of power. Based on the small signal model of DC-DC Converter, the simple and exact power stage model of parallel operation system is derived and the parallel operation system using current balance method for the uniform current distribution among the parallel operation system is proposed. Using Simulation programs, which consists of nonidentical Converter modules and changes the position of master and slave automatically, the current distribution error is kept within the limit in the parallel operation system. To verify the high performance of the proposed Converter system for parallel operation, the parallel operation test, which has 2 Converter modules of 1 kW, is accomplished. Also, the simulation result is good agreement with the experiment result in the transient and starting characteristics.
Research of Stresses Distribution and Loading Weight on Concrete Electric Pole Considering Field Condition
Kim, Dong-Myung ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 18, issue 5, 2004, Pages 183~188
DOI : 10.5207/JIEIE.2004.18.5.183
A method of double-pole construction is developing to strengthen the mechanical intensity of the electric poles. Therefore the mechanical properties of the double-pole were researched in this paper. First, considering field special quality electric poles were established. In the next tensile force was applied and stress distribution and fatigue load were examined. When a base of the pole is concrete, mechanical intensity of the double-pole increased about 1.7 times compared a single pole. In the case of general soil base, the concrete base should be needed to expect the reinforcement effect of the double-pole.
Dynamic Line Rating Estimation Using Indirect Conductor Method in Overhead Transmission Lines
Kim, Sung-Duck ; Lee, Seung-Su ; Jang, Tae-In ; Kang, Ji-Won ; Lee, Dong-Il ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 18, issue 5, 2004, Pages 189~197
DOI : 10.5207/JIEIE.2004.18.5.189
The thermal rating of an overhead conductor, which is the maximum allowable current, is generally calculated on the basis of heat balance equation found in IEEE P738 standard. This is given as a function of the weather conditions such as air temperature, wind speed, wind direction, and sun heat. Wind speed among such weather parameters is strongly affected on determining the line rating when it appears very low level. Therefore there may occur inaccuracy since most anemometers used in line rating monitor systems may show low resolutions and stall speed performance. In this paper, we introduce a new methodology for determining the dynamic line rating in overhead transmission lines, without using my anemometer. It was shown that wind speed can be estimated by the temperatures of 2 indirect conductors, and through experimental study, the dynamic line rating obtained by the estimated wind speed was very closely that of weather model.
Generator Exciter Control Using H
Hong, Hyun-Moon ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 18, issue 5, 2004, Pages 198~202
DOI : 10.5207/JIEIE.2004.18.5.198
This thesis proposes a robust controller introducing the H
control theory, one of the robust control theories that can obtain desired control performance while ensuring robustness for the uncertainty and disturbance contained in the power system. The performance of the designed controller is examined by extensive non-linear time domain simulation. Results show that the proposed H
controller is superior to that of the conventional controller.