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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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The Transactions of The Korean Institute of Electrical Engineers
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The Korean Institute of Electrical Engineers
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Volume & Issues
Volume 62, Issue 12 - Dec 2013
Volume 62, Issue 11 - Nov 2013
Volume 62, Issue 10 - Oct 2013
Volume 62, Issue 9 - Sep 2013
Volume 62, Issue 8 - Aug 2013
Volume 62, Issue 7 - Jul 2013
Volume 62, Issue 6 - Jun 2013
Volume 62, Issue 5 - May 2013
Volume 62, Issue 4 - Apr 2013
Volume 62, Issue 3 - Mar 2013
Volume 62, Issue 2 - Feb 2013
Volume 62, Issue 1 - Jan 2013
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Interpretation Works and Online Terminology Information System for the Standardization of Smart Grid Terminologies
Hwang, Humor ; Kim, Jung-Hoon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 3, 2013, Pages 293~299
DOI : 10.5370/KIEE.2013.62.3.293
Power system technologies in the area of smart grid are being converged with communication system technologies or information technologies(IT). This interdisciplinary action affects on two parts vigorously so that IT has become a essential part of power industry. But terminologies of two parts are confused and it is necessary that these are standardized to develop the industry. The interpretation works with scientific and technological standard of the smart grid terminologies which are IEC TC 57 glossary and non-glossary terminologies are introduced. Based on the interpretation works of the smart grid terminologies, an online terminology information system for the standardization of smart grid terminologies is proposed. The system provides the capability of collection and delivery of academic society opinions for the selected and interpreted terminologies.
Review Criteria for Reliability from Analysis of LOOP frequency in NPPs
Moon, Su-Cheol ; Kim, Kern-Joong ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 3, 2013, Pages 300~305
DOI : 10.5370/KIEE.2013.62.3.300
LOOP(Loss of Offsite Power) and SBO(Station Blackout) events have been occurring in nuclear power plants should be reviewed and be controlled on important electrical equipments by professional engineer to prevent and to safety improvement from safety assessment and reliability analysis report. LOOP and SBO occasionally happened by internal or external causes. This paper contained that LOOP frequency in the United States NPPs and in the domestic NPPs have compared and analyzed data by the past lessons and probabilistic statistics. Additionally will be installed MG(Mobile Generator) according to the lessons of Fukushima nuclear accident in Japan, which CDF(Core Damage Frequency) and LOOP frequency have reconsidered. And this paper proposed to reduce reliability criteria using PSA(Probabilistic Safety Analysis).
A Study on the Revenue Reconciliation Algorithm of Real-time Pricing Considering Imperfect Information on Customer Response
Kwon, Jong-Hwan ; Kim, Balho H. ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 3, 2013, Pages 306~311
DOI : 10.5370/KIEE.2013.62.3.306
The Real-Time-Pricing (RTP) brings greatest values in terms of economic incentives and efficiency among the dynamic pricing schemes. The electric power industry in Korea is mainly operated by publicly owned utilities and strongly regulated by the government; therefore, revenue reconciliation of RTP is inevitably required to prevent revenue deficits. In this paper, a revenue reconciliation of real-time pricing considering imperfect information on customer response is proposed to prevent revenue deficit and distortion of the spot price. A case study is present to verify the applicability of the proposed method.
Study on Present Status and Future Direction of Korean Offshore Wind Power
Sung, Jin Ki ; Lee, Tae Jin ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 3, 2013, Pages 312~321
DOI : 10.5370/KIEE.2013.62.3.312
In this study, we review the status of Southwest sea 2.5GW offshore wind project and expected various problems. And we suggest government policies for offshore wind industrialization. Especially, we would like to mention the necessity of offshore wind development in order to diversify power sources and guarantee energy security in Korea. And we would like to mention necessity and direction to make offshore wind into growth engine industry thorough fusion between industries and energization for the existing industry such as civil, shipbuilding, steel, etc. that was headed into downturn.
Development of Pilot Plant for Distributed Intelligent Management System of Microgrids
Oh, Sang-Jin ; Yoo, Cheol-Hee ; Chung, Il-Yop ; Lim, Jae-Bong ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 3, 2013, Pages 322~331
DOI : 10.5370/KIEE.2013.62.3.322
This paper describes the development of the pilot plant of distributed intelligent management system for a microgrid. For optimal control and management of microgrids, intelligent agents area applied to the microgrid management system. Each agent includes intelligent algorithms to make decisions on behalf of the corresponding microgrid entity such as distributed generators, local loads, and so on. To this end, each agent has its own resources to evaluate the system conditions by collecting local information and also communicating with other agents. This paper presents key features of the data communication and management of the developed pilot plant such as the construction of mesh network using local wireless communication techniques, the autonomous agent coordination schemes using plug-and-play functions of agents and contract net protocol (CNP) for decision-making. The performance of the pilot plant and developed algorithms are verified via real-time microgrid test bench based on hardware-in-the-loop simulation systems.
An Accuracy Improvement on Acquisition Time of SCADA RTU Status Event
Lee, Ju-Heon ; Lee, Sang-Joong ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 3, 2013, Pages 332~341
DOI : 10.5370/KIEE.2013.62.3.332
SCADA RTU is a remote control unit equipped in substations for automatic operation of a power system. The RTU monitors and measures the operation status of remote substations to transmits the signals to upper SCADA system and receives control command signals from dispatch center to actuate corresponding apparatus. The RTU receives the standard time from GPS receiver to synchronize the times for all devices and acquires the status event of power apparatus using DIM. Without the time synchronization between GPS and RTU, stable operation of the power system and accurate analysis of the system fault are impossible due to the time error of SOE. In this paper, a test is performed to identify if the operation time of SCADA RTU DIM coincides with the standard time. And we tried to find the reason of error, to minimize the time discrepancy. Through this study, RTU operation time could be synchronized with the standard time within 10[ms] to improve the reliability of SOE data.
Maximum Efficiency Point Tracking Control Algorithm for Improving Electric Power Transmission Efficiency between Photovoltaic Power Generating system and the Grid
Kwon, Cheol-Soon ; Kim, Kwang Soo ; Do, Tae Young ; Park, Sung-Jun ; Kang, Feel-Soon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 3, 2013, Pages 342~348
DOI : 10.5370/KIEE.2013.62.3.342
It proposes an efficient control algorithm to increase electric power transmission efficiency between photovoltaic power generating system and the grid. The main controller finds a maximum efficiency condition by considering the quantity of power generated from PV arrays, the number of inverters, and efficiency of PV inverter. According to the condition, a relay board arranges a point of contract of PV arrays. By the disposition of PV arrays, it assigns the optimized power on each PV inverter. Operational principle of the proposed maximum efficiency point tracking algorithm is given in detail. To verify the validity of the proposed approach, computer-aided simulation and experiment carried out.
Wireless Power Transmission using Electromagnetic Inductive Coupling and LC Resonant
Lee, Seung-Hwan ; Kimm, Hyoen-Min ; Kim, Hee-Je ; Kim, Su-Weon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 3, 2013, Pages 349~354
DOI : 10.5370/KIEE.2013.62.3.349
Wireless power transmission introduced by Tesla has instrumented by many scientists of the world. This technique first was utilized as wireless communications such as radio in long range transmission. And contactless transmission using inductive property was used on white goods. In 2007, MIT` lab introduced that new wireless power transmission by magnetic resonance which has about 50% efficiency and 2M transmission distances, it was a chance to refocus a new possibility of wireless power transmission. In this paper, using LC coupling compensate the short distances of contactless transmission, this simple method could transmit about 30cm distances. Using this approach, it can be solved the short transmission distances, a drawback of Electromagnetic inductive coupling method.
Input AC Voltage Sensorless Control for a Three-Phase Z-Source PWM Rectifier
Han, Keun-Woo ; Jung, Young-Gook ; Lim, Young-Cheol ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 3, 2013, Pages 355~364
DOI : 10.5370/KIEE.2013.62.3.355
Respect to the input AC voltage and output DC voltage, conventional three-phase PWM rectifier is classified as the voltage type rectifier with boost capability and the current type rectifier voltage with buck capability. Conventional PWM rectifier can not at the same time the boost and buck capability and its bridge is weak in the shoot- through state. These problems can be solved by Z-source PWM rectifier which has all characteristic of voltage and current type PWM rectifier. By shoot-through duty ratio control, the Z-source PWM rectifier can buck and boost at the same time, also, there is no need to consider the dead time. This paper proposes the input AC voltage sensorless control method of a three-phase Z-source PWM rectifier in order to accomplish the unity input power factor and output DC voltage control. The proposed method is estimated the input AC voltage by using input AC current and output DC voltage, hence, the sensor for the input AC voltage detection is no needed. comparison of the estimated and detected input AC voltage, estimated phase angle of the input voltage, the output DC voltage response for reference value, unity power factor, FFT(Fast Fourier Transform) of the estimated voltage and efficiency are verified by PSIM simulation.
Analysis of Factor on the Temperature Effect on the Output of PV Module
Lim, Jong-Log ; Woo, Sung-Cheol ; Jung, Tae-Hee ; Min, Yong-Ki ; Won, Chang-Sub ; Ahn, Hyung-Keun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 3, 2013, Pages 365~370
DOI : 10.5370/KIEE.2013.62.3.365
Generally, photovoltaic modules consist of glass, EVA, Solar Cell, back sheet and ribbon. But EVA, solar cell, ribbon affect electric output with temperature. EVA is a change in the transmittance of light from the sun. In addition, the solar cell output is decreased with temperature and the ribbon increases resistance. Transmittance and reflectance of glass and EVA were measured. In this paper, the characteristics of the components of PV module as EVA and Glass, ribbon were studied by variable temperature. effects on material properties investigated. As a result, glass is independent in temperature variation. EVA was the reduction 1~4% in transmittance. Solar cell decrease 0.469[%/
] in electric output by temperature variation. Other factors was controlled in solar cell..
Prediction of Output Power for PV Module with Tilted Angle and Structural Design
Ko, Jae-Woo ; Yun, Na-Ri ; Min, Yong-Ki ; Jung, Tae-Hee ; Won, Chang-Sub ; Ahn, Hyung-Keun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 3, 2013, Pages 371~375
DOI : 10.5370/KIEE.2013.62.3.371
A new model about output power prediction of PV module with various tilted angles and cell to cell distances has been proposed in this paper. Light intensity arrived on a solar cell could be changed by characteristics of PV module materials. Refractive indices, thickness and absorption coefficients of glass, EVA, solar cell and Backsheet are used to predict output. Also, the incident angle of light is changed 0 to 90[
] and cell to cell distances are 5, 10 15[mm]. Two types of light incident on a solar cell are considered which are direct to a solar cell and reflected from Backsheet. The intensity of the incident light directly into the solar cell is reduced through glass and EVA about 17.5[%] in theoretical way. It has an error of 2.26[%] compared with experimental result. The results for compare theoretical with experimental data is validated within the error of 6.3[%]. This paper would be a research material to predict output power when the PV module is installed outdoor or a building.
Surface States and Field Emission Properties of Oxygen Plasma Treated Carbon Nanotubes
Lee, Sunwoo ; Lee, Boong-Joo ; Park, Gu-Bum ; Shin, Paik-Kyun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 3, 2013, Pages 376~379
DOI : 10.5370/KIEE.2013.62.3.376
Multi-walled carbon nanotubes (MWCNTs) were synthesized using catalytic chemical vapor deposition (CVD) method. Oxygen plasma treatment was applied to modify surface state of the CNTs synthesized for improvement of field emission performance. Surface state of the plasma treated CNTs was studied by X-ray photoelectron spectroscopy (XPS). The surface states of the CNTs were changed as a function of plasma treatment time. The oxygen related carbon shift was moved toward higher binding energy with the plasma treatment time. This result implies that the oxygen plasma treatment changes the surface state effectively. While any shift in carbon 1s peak was not detected for the as grown CNTs, oxygen related carbon shift was detected for the plasma treated CNTs. Carbon shift implies that closed CNT tips were opened by the oxygen plasma and reacted with oxygen species. Since the field emission occurs at pentagons or dangling bonds of the CNT tips, the increase of carbon-oxygen bonds plays an important role in field emission behavior by increasing the number of electron emission sites resulting in improvement of the field emission performance.
A Study on Wideband Adaptive Beamforming using Taylor Weighting and LSMI Algorithm
Oh, Kwan-Jin ; Lee, Hee-Young ; Kim, Seon-Joo ; Chung, Young-Seek ; Cheon, Changyul ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 3, 2013, Pages 380~386
DOI : 10.5370/KIEE.2013.62.3.380
This paper represents an adaptive beamforming technique to suppress interference or jamming signals in wideband. In order to maintain low side lobe level(SLL) at an antenna element level, Taylor-weighting was used. Also, to make a nulling beam pattern toward jammer`s directions in wideband, we used the modified Loaded Sample Matrix Inversion(LSMI) algorithm and Tapped Delay Line(TDL). To verify the proposed algorithm, we applied it to a rectangular array antenna. Finally, the results show beam pattern with low SLL and jammers suppression.
Position and Heading Estimation System for the Visually Impaired Person
Choi, Ka Hyung ; Cheon, Hyo Seok ; Park, Jin Bae ; Yoon, Tae Sung ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 3, 2013, Pages 387~394
DOI : 10.5370/KIEE.2013.62.3.387
A travel aid system for the visually impaired person is proposed by providing the position and heading information. The position and heading information is obtained from range difference localization estimator, and the information is notified to the visually impaired person by using braille display system. For the precise estimation of the position and heading information, we apply recently developed linear localization estimator which utilizes the instrumental variable method and the state augmentation method. The estimation results are compared with well-known Kalman filter through experiment.
Implementation of High Accurate Level Sensor System using Pulse Wave Type Magnetostriction Sensor
Choi, Woo-Jin ; Lee, John-Tark ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 3, 2013, Pages 395~400
DOI : 10.5370/KIEE.2013.62.3.395
In this paper, we introduce the implementation of high accurate level sensor system using the pulse wave type magnetostriction sensor. When a current pulse flows along the waveguide, the magnetic field also propagates towards the end of waveguide. When this magnetic field just passes the position of the magnet for level detection, the resultant magnetic field by these two magnetic fields makes a torsional reflected signal. This is used to calculate the time difference between a interrogation pulse wave and this torsional reflected signal. The key elements and characteristics were investigated to implement level sensor system based on this principle. We introduce a method to calculate the speed of ultrasonic reflected signal and how to make a model of sensing coil. In particular, we experiment with the characteristics of the torsional reflected signal according to the changes of the interrogation voltage and displacement. To make high accurate level sensor system, two methods were compared. One is to use the comparator and time counter, the other is STFT(Short Time FFT) which is capable of the time-frequency analysis.
Tracking Control of a Mobile Robot using Gain-scheduling Control Method
Kwon, Hae-Yeong ; Choi, Ho-Lim ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 3, 2013, Pages 401~406
DOI : 10.5370/KIEE.2013.62.3.401
The mobile robot is one of the widely-used systems in service industry. We propose a gain-scheduling feedback controller for the tracking control of the mobile robot. The benefit of our proposed controller is that it avoids the singularity issue occurs with the controllers suggested in , . Moreover, we show the stability analysis of the controlled system via a Lyapunov stability approach such that the exponential convergence of tracking error to zero is analytically provided. The simulation results show the validity of the proposed controller and improved control performance over the conventional controller.
Anti-Swing Control of Overhead Crane System using Sum of Squares Method
Hong, Jin-Hyun ; Kim, Cheol-Joong ; Chwa, Dongkyoung ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 3, 2013, Pages 407~413
DOI : 10.5370/KIEE.2013.62.3.407
This paper proposes anti-swing control of overhead crane system using sum of squares method. The dynamic equations of overhead crane include nonlinear terms, which are transformed into polynomials by using Taylor series expansion. Therefore the dynamic equation of overhead crane can be changed to the system of polynomial equation. On the basis of polynomial dynamics of crane system, we propose the Sum of Squares (SOS) conditions considering the input constraints. In addition, control gains are obtained by numerical tool which is called by SOSTOOL. The effectiveness of the proposed method is demonstrated by numerical simulation.
Reliability Analysis of Train Ethernet Backbone
Kim, Joonkyo ; Park, Jaehyun ; Oh, Yongkuk ; Hwang, Hyeoncheon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 3, 2013, Pages 414~416
DOI : 10.5370/KIEE.2013.62.3.414
As the usage of the electric power train increases, the importance of the control network between the electric control devices grows. IEC proposed a revision of IEC-61375, a standard of the networking among electric devices within a train, to adopt Ethernet as a backbone of train network. This paper performed the reliability analysis of three configurations of Ethernet-based networking within a electric power train that are recommended in IEC-61375 standard. The analysis results show that MTTF(mean time to failure) of the redundant configuration is 20,086 hours, which is a about 3 times longer than the linear configuration.
BESS Modeling and Application to Voltage Compensation of Electric Railway System
Yoo, Hyeong-Jun ; Son, Ho-Ik ; Kim, Hak-Man ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 3, 2013, Pages 417~423
DOI : 10.5370/KIEE.2013.62.3.417
The load of electric railroad can generate voltage fluctuation in the electric railway system because of high speed of the electric railroad and frequent movement and stop. This voltage fluctuation of electric railway system can cause not only voltage imbalance but also harmonic in the utility grid. Therefore the electric railroad system is in need of the reactive power compensation, such as static synchronous compensator (STATCOM) and static var compensator (SVC). Especially, the battery energy storage system (BESS) can control the real and reactive power at the same time. In this paper, the electric railway system using BESS has been modeled to show its voltage compensation effect using Matlab/Simulink.
A New Design on the Parallel Load Type IGBT Brake Chopper System for KTX-1 High Speed Train
Youn, Cha-Joong ; Noh, Myoung-Gyu ; Lee, Eul-Jae ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 3, 2013, Pages 424~430
DOI : 10.5370/KIEE.2013.62.3.424
This paper presents a new design works for the braking chopper system which is included in the propulsion system of KTX high speed train. Due to the current fed type synchronous motors used in the propulsion system, some different behaviors are shown comparing to the voltage type other chopper systems. Specially this chopper system acts either braking controlling or regenerative power controlling system with a parallel resistive load in the propulsion system. In this paper, an improved simple high power IGBT brake chopper system has proposed which is able to be replaced with an existing complicated GTO chopper system. The analytical approaches to the parallel load type current chopper system and the propper snubber circuits calculation were explained in this paper to control new chopper system. In addition, the thermal resistance of the cooling system for power dissipation of IGBT modules was calculated also. Finally several PC simulations have been done to clarify its availability.
The Development on Train Detection System and Performance Testing on Automatic Changeover System in Neutral Section
Han, M.S. ; Chang, S.H. ; Shin, M.C. ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 3, 2013, Pages 431~436
DOI : 10.5370/KIEE.2013.62.3.431
A neutral section is installed around feeding substation(SS) and sectioning post(SP) that M phase and T phase are isolated in AC feeding system. Electric Train under "Notch-OFF" is operated by inertia within the neutral section. It causes disturbing the operation of electric trains for speed drop and driver`s mistakes. A automatic changeover system with thyristor recently have taken under development. In the paper, it is introduced the configuration of train detection system and performance testing on automatic changeover system..