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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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Journal DOI :
The Korean Institute of Electrical Engineers
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Volume & Issues
Volume 63, Issue 12 - Dec 2014
Volume 63, Issue 11 - Nov 2014
Volume 63, Issue 10 - Oct 2014
Volume 63, Issue 9 - Sep 2014
Volume 63, Issue 8 - Aug 2014
Volume 63, Issue 7 - Jul 2014
Volume 63, Issue 6 - Jun 2014
Volume 63, Issue 5 - May 2014
Volume 63, Issue 4 - Apr 2014
Volume 63, Issue 3 - Mar 2014
Volume 63, Issue 2 - Feb 2014
Volume 63, Issue 1 - Jan 2014
Selecting the target year
A Synthetical Study on Power Quality Measurement of Grid-Connected Wind Turbine Generating System based on the IEC International Standards
Cho, Soo-Hwan ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 2, 2014, Pages 197~204
DOI : 10.5370/KIEE.2014.63.2.197
As more and more renewable energy resources are connected into the existing power system and their generation capacities are increasing, the need for regulations to minimize their impacts on the power grid is increasingly growing. And minimizing the irregular impacts made by grid-connected wind generators is important, since the output power generated by renewable energy resources can be changed easily by the weather condition and surrounding environment. In South Korea, an operational technical standard for distributed generation is used as a regulation, in which renewable energy sources including wind power are considered as a kind of distributed generation. In this paper, an international standard, IEC 61400-21, for the grid-connected wind turbine generating system(WTGS) will be introduced and a comprehensive and detailed review on the measuring methods of power quality characteristic parameters for WTGS based on the related IEC standards will be presented. Additionally, some prerequisites for applying the international standards to KEPCO system will be proposed.
Optimal Operation Scheme and Reliability Index Improvement of Micro Grid Using Energy Storage Systems
Kim, Kyu-Ho ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 2, 2014, Pages 205~210
DOI : 10.5370/KIEE.2014.63.2.205
The micro grid considered in this paper consists of a diesel generator, a photovoltaic array, a wind turbine, a fuel cell, and a energy storage system. This paper explains and simulates the micro grid components in terms of accuracy and efficiency of having a system model based on the costs of fuel as well as operation and maintenance. For operational efficiency, the objective function in a diesel generator consists of the fuel cost function similar to the cost functions used for the conventional fossil-fuel generating plants. The wind turbine generator is modeled by the characteristics of variable output. The optimization is aimed at minimizing the cost function of the system while constraining it to meet the customer demand and safety of micro grid. The operating cost in fuel-cell system includes the fuel costs and the efficiency for fuel to generate electric power. To develop the overall system model gives a possibility to minimize of the total cost of micro grid. The application of optimal operation can save the interruption costs as well as the operating costs, and improve reliability index in micro grid.
A Study on the Decision of Appropriate Subsidy Levels for Energy Storage Systems Considering Load Leveling in Smart Place
Kim, Jung-Hoon ; Hwang, Sung-Wook ; Lee, Hak-Ju ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 2, 2014, Pages 211~216
DOI : 10.5370/KIEE.2014.63.2.211
Construction of power plants and T&D facilities is so difficult because of the civil complaints and the additional cost according to the concerning field conditions. Therefore, various researches and methods have been considered to get solutions in the demand side and energy storage systems have been in the spotlight because of the various functions such as peak shaving, load shifting, and power system stabilizing, and so on. Residential small size batteries are considered in this paper and the economic analysis is carried out to evaluate the reasonable subsidy levels for the deployment of energy storage systems. Various economic parties are considered to find reasonable subsidy level comparing each other, which parties consist of utilities, participants and non-participants in general. The evaluation is based on California Standard Practice Test and the results are able to be used as subsidy guidelines.
A Study on Mobility Loads and the Deployment Patterns for the Development of Smart Place Load Model
Hwang, Sung-Wook ; Song, Il-Keun ; Kim, Jung-Hoon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 2, 2014, Pages 217~223
DOI : 10.5370/KIEE.2014.63.2.217
Recently, various researches and projects about electric vehicles are in progress vigorously and continuously and it is expected to penetrate rapidly with the next a few years. This deployment will cause the change of load composition rate affecting on power system planning and operations. Therefore, a new load model should be developed integrating with electric vehicle loads. In this paper, the load composition rate of residential sectors is analyzed considering the deployment of this mobility load such as electric vehicles and a new diffusion model is proposed based on the classification of the replacement patterns. Additionally, electric vehicle charging loads are basically modeled by some individual load experiments to develop new load models for smart place and some new conceptual power systems such as micro grids.
Improvement Method of SVR Control in Power Distribution System Interconnected Distributed Generator
Lee, Hyun-Ok ; Huh, Jae-Sun ; Kim, Byung-Ki ; Rho, Dae-Seok ; Kim, Jae-Chul ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 2, 2014, Pages 224~229
DOI : 10.5370/KIEE.2014.63.2.224
This paper presents the novel voltage control method in power distribution system with distributed generators. The voltage in distribution systems is regulated by Under Load Tap Changer(ULTC) of substation and pole transformer of primary feeders. Recently, Step Voltage Regulator(SVR) is getting located at distribution feeders to regulate effectively voltage of primary feeders. But the effectiveness of SVR decreases due to independent operation between SVR and ULTC, and also the existing Line Drop Compensator(LDC) method considering the distributed generators may be not able to regulate the proper voltage in a permissible range. Thus, this paper presents a optimal voltage control algorithm of SVR by using the secondary voltage data of main transformer in substation.
Analysis on Voltage Sag According to Impedance and Application Location of SFCL with Recloser-Recloser Coordination
Kim, Yi-Gwan ; Noh, Shin-Eui ; Kim, Jin-Seok ; Kim, Jae-Chul ; Lim, Sung-Hun ; Kim, Hye-Rim ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 2, 2014, Pages 230~236
DOI : 10.5370/KIEE.2014.63.2.230
Superconducting fault current limiter (SFCL) has been expected as one of more effective solutions for decreasing fault current instantaneously and various types of SFCLs have been developed to apply into real power system. Recently, the application of the SFCL in a power distribution system has been reported to be contributed to the suppression of the voltage sag as well as the limitation of the fault current. However, the suppressing effect of voltage sag by the SFCL depends on component of its impedance and its application location in a power distribution system considering the recloser-recloser coordination. This paper analyzed the voltage sag caused by recloser-recloser coordination in a power distribution system and the suppression of the voltage sag due to the application location of the SFCL in a power distribution system was discussed through the PSCAD/EMTDC simulation.
A Comparative Study on the Exterior Rotor BLDC Motor According to the Rotor Permanent Magnet Shape
Jeong, Jae-Hoon ; Cho, Han-Wook ; Choi, Jang-Young ; Im, Young-Hun ; Jang, Seok-Myeong ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 2, 2014, Pages 237~244
DOI : 10.5370/KIEE.2014.63.2.237
In this paper, we presented a study on the design of permanent magnet rotor for exterior rotor type brushless direct current(BLDC) motor. To reduce the cogging torque and torque ripple, the specific shape and magnetization pattern of permanent magnets in BLDC motors are suggested. Firstly, four permanent magnet models with different shapes and magnetization arrays are presented. The results from the finite element method(FEM), the most effective model for reducing cogging torque and torque ripple was presented. In addition, to confirm the steady state performance, the torque-speed characteristic analysis has been performed with variable speed and load. Finally, the best permanent magnet model for reducing cogging torque and torque ripple with appropriate torque-speed performance was selected through the comparison according to the device volume.
Technological and Theoretical Relationship between Wireless Power Transfer Technologies
Lee, Dong-Su ; Lim, Dong-Nam ; Jeon, Seong-Jeub ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 2, 2014, Pages 245~249
DOI : 10.5370/KIEE.2014.63.2.245
Wireless power transfer (WPT) system is very attractive because it removes power cables from home appliances, office equipments and battery chargers for electric vehicles. In this paper, non-radiative WPT systems studied recently are claimed to be technologically or theoretically identical in operation irrespective of the number of coils. Especially, 2-coil and 3-coil systems are compared in detail. It is also shown that multiplicity of coils does not increase power transfer capability.
A Study on the Characteristics of μc-Si:H Films Prepared by Multistep Deposition Method using SiH
Kim, Taehwan ; Kim, Dong-Hyun ; Lee, Ho-Jun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 2, 2014, Pages 250~256
DOI : 10.5370/KIEE.2014.63.2.250
In this study, we deposited and investigated
-Si:H thin films prepared by Plasma Enhanced Chemical Vapor Deposition(PECVD) system. To deposition silicon thin films, we controlled
gas concentration, RF input power, and heater temperature. According to the experiments, the more
gas concentration increased, deposition rate also increased but crystalline property decreased at the same conditions. In the RF input power case, deposition rate and crystalline property increased together when the input power increased from 100[W] to 300[W]. If RF input power was 300[W], deposition rate has reached saturation point. In the heater temperature, deposition rate increased when heater temperature increased. Crystalline property maintained a certain level until heater temperature was
. And then it was a suddenly increased. Multistep method has been proposed to improve the quality of
-Si:H thin film.
gas was injected with a time interval. According to the experiments, crystallite ratio improve about 20~60[%] and photo conductivity increased up to six times.
The Design of High Gain Waveguide Array Antenna Combining Horn Antenna
Lee, Han-Young ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 2, 2014, Pages 257~260
DOI : 10.5370/KIEE.2014.63.2.257
In this paper, a high gain waveguide array antenna combining horn antenna on slot radiator was designed. And the fabricated antenna showed enough gain, improved efficiency and broadband characteristics for receiving satellite signals, compare to conventional microstrip antenna which has dielectric loss and radiation loss on transmission line. For easy fabrication, the waveguide structure was composed by 3-stages of radiator, signal coupler and transmission line. By experiment, the array waveguide antenna of 4 by 16 showed 28.3[dBi] gain and 2:1 of VSWR. And by combining horn antenna structure, the gain was increased 1[dB]. The received signal from Koreasat 6 by measurement showed 16[dBc] of C/N on BS(Broadcasting Satellite)-band and 14[dBc] of C/N on CS(Communication Satellite)-band.
Sampled-data Control for Lur'e Dynamical Systems
Liu, Yajuan ; Lee, Sangmoon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 2, 2014, Pages 261~265
DOI : 10.5370/KIEE.2014.63.2.261
This paper studies the problem of the sampled-data control for Lur'e system with nonlinearities. The nonlinearities are expressed as convex combinations of sector and slope bounds. It is assumed that the sampling periods are arbitrarily varying but bounded. By constructing a new augmented Lyapunov-Krasovskii functional which have an augmented quadratic form with states as well as the nonlinear function, the stabilizing sampled-data controller gains are obtained by solving a set of linear matrix inequalities. The effectiveness of the developed method is demonstrated by numerical simulations.
A Study on the Effects of I&C Systems by EMI Generating from Corona Discharge at Transformer Area
Min, Moon-Gi ; Lee, Jae-Ki ; Park, Jin-Yeub ; Kim, Hee-Je ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 2, 2014, Pages 266~271
DOI : 10.5370/KIEE.2014.63.2.266
The Electromagnetic Interference(EMI) generating from corona discharge of transformer area can interference the digital Instrument and Control(I&C) systems located nearby transformers. When the potential gradient of the electric field around the conductor is high enough to form a conductive region but not high enough to cause electrical breakdown to nearby objects, the EMI of corona discharge emits with the conducted and radiated noise and it interferences the signals of the I&C systems. Since digital I&C systems have an efficiency and competitive price, the analog I&C systems have been upgraded and displaced with the digital I&C systems but which have less EMI Immunity. There was no assessment to I&C systems by EMI generating corona discharge nearby transformers. When the safety-related I&C systems are installed in plants, the verification of equipment EMI should be done not in site-specific test but in test facilities. There are the need to do the site-specific EMI evaluation of corona discharge nearby transformers. This paper assesses the margin between plant emission limits and the highest composite plant emission of corona. When the non safety-related I&C systems are placed in transformer area, it suggests the appropriate radiated susceptibility level to EMI of corona discharge.
SWM Utilized Cable Drive System
Lee, Bum-Joo ; Kim, Kab Il ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 2, 2014, Pages 272~276
DOI : 10.5370/KIEE.2014.63.2.272
In this paper, cable drive mechanism is proposed to implement high reduction gear ratio. Cable drive mechanism has great advantages such as light weight, high degree of freedom about design aspect and zero backlashes. However, it is restrictively utilized for robotic applications because it is difficult to implement high reduction gear ratio more than 10 to 1. Proposed mechanism enables multi-level reductions by adopting seamless winding method (SWM) which links the previous output axis and the next input axis. Consequently, this reduces the mechanical complexity significantly and enables high reduction with only one single wire cable. 3D CAD design was provided and prototype was manufactured.
Localization using Fuzzy-Extended Kalman Filter
Park, Sung-Yong ; Park, Jong-Hun ; Wang, Hai-Yun ; No, Jin-Hong ; Huh, Uk-Youl ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 2, 2014, Pages 277~283
DOI : 10.5370/KIEE.2014.63.2.277
This paper proposes robot localization using Fuzzy-Extended Kalman Filter algorithm of the mobile robots equipped with least sensors. In order to improve the accuracy of the localization, we usually add the sensors or equipment. However, it increases the simulation time and expenses. This paper solves this problem using only the odometer and ultrasonic sensors to get the localization with the Fuzzy-Extended Kalman Filter algorithm method. By inputting the robot's angular velocity, sensor data variation, and residual errors into the fuzzy algorithm, we get the sensor weight factor to decide the sensor's importance. The performance of the designed method shows by the simulation and Pioneer 3-DX mobile robot test in the indoor environment.
Feasibility Study on Development of a Fiber-Optic Dual Detector to Measure Beta- and Gamma-rays Simultaneously
Hong, Seunghan ; Shin, Sang Hun ; Sim, Hyeok In ; Kim, Seon Geun ; Jeon, Hyesu ; Jang, Jaeseok ; Kim, Jaeseok ; Kwon, Guwon ; Jang, Kyoung Won ; Yoo, Wook Jae ; Lee, Bongsoo ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 2, 2014, Pages 284~290
DOI : 10.5370/KIEE.2014.63.2.284
A fiber-optic beta/gamma dual detector system with two types of sensing probes was fabricated to detect the beta- and gamma-rays simultaneously. As scintillators of the sensing probe type 1, two different inorganic scintillators,
and LYSO(Ce) crystals, were used to obtain the each scintillating efficiency with respect to beta-and gamma-rays and the inherent energy spectra of radioactive isotopes. In the case of the sensing probe type 2, which is composed of two identical inorganic scintillators and a beta shielding material based on the lead, it could discriminate beta- and gamma-rays using a subtraction method. In conclusion, we demonstrated that the proposed fiber-optic beta/gamma dual detector could measure and discriminate beta- and gamma-rays using both energy spectroscopy and subtraction method.
An Accuracy Analysis of Run-test and RA(Reverse Arrangement)-test for Assessing Surface EMG Signal Stationarity
Lee, Jin ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 2, 2014, Pages 291~296
DOI : 10.5370/KIEE.2014.63.2.291
Most of the statistical signal analysis processed in the time domain and the frequency domain are based on the assumption that the signal is weakly stationary(wide sense stationary). Therefore, it is necessary to know whether the surface EMG signals processed in the statistical basis satisfy the condition of weak stationarity. The purpose of this study is to analyze the accuracy of the Run-test, modified Run-test, RA(reverse arrangement)-test, and modified RA-test for assessing surface EMG signal stationarity. Six stationary and three non-stationary signals were simulated by using sine wave, AR(autoregressive) modeling, and real surface EMG. The simulated signals were tested for stationarity using nine different methods of Run-test and RA-test. The results showed that the modified Run-test method2 (mRT2) classified exactly the surface EMG signals by stationarity with 100% accuracy. This finding indicates that the mRT2 may be the best way for assessing stationarity in surface EMG signals.
A Study on Deterioration Evaluation Method by Condition Monitoring and Diagnosis for Aging Oil-immersed Power Transformers
Chang, Jeong-Ho ; Lee, Sung-Hun ; Lee, Heung-Ho ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 2, 2014, Pages 297~305
DOI : 10.5370/KIEE.2014.63.2.297
Nowadays new water supply projects have been on the decline as the water-power constructions have saturated, which means that the existing power equipment have slowly aged and they require more efforts to maintain the system performance. An effective asset management method of power equipment has become a great necessity from both economical and technical aspects. To be balanced, the asset management should look into all three parts: management, engineering, and information. The purpose of this paper is to study a Risk-Based Maintenance (RBM) matrix method through the deterioration evaluation algorithm for an efficient reliability assessment of oil-immersed power transformers by considering both asset management and technical evaluation. Make use of this result, the equipment will be decided to be replace or repair otherwise on service.
Implementation of Integrated Interface based on Wire and Wireless Dual Network for Ensuring the Reliability of Intelligent LED Lighting System
Lee, Un-Seon ; Park, Tae-Jin ; Park, Man-Gon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 2, 2014, Pages 306~312
DOI : 10.5370/KIEE.2014.63.2.306
The ZigBee communication method, which is the most frequently applied to the LED lighting control system, has drawbacks of low-speed and low-capacity, and the communication failure possibility due to environmental influences is on the rise. Therefore, it is important to secure the communication reliability by applying an integrated interface with a wire-wireless dual-network. This paper developed a communication module, which has a platform converging and combining the ZigBee of USN environments with the PLC of power line communication environments, to implement a dualized communication interface system supporting the wire-wireless integrated protocol, and implemented a wire-wireless networking device and a control system software technology. As a result, it was automatically switched into the PLC communication within 4.4 seconds on average when there was an access failure in the ZigBee communication network, so a reliable communication network was built.
A Study on Economic Analysis of Development of On-line Diagnosis Technique for Preventing Electrical Accidents
Kim, Han-Sang ; Kim, Kwang-Ho ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 2, 2014, Pages 313~318
DOI : 10.5370/KIEE.2014.63.2.313
In the last couple of decades industrialization and technological development has not only increase in the scale of electrical facilities and it has become more and more complicated and diversified. Furthermore, fires in the electrical transformers, like those that have knocked out power in the country in the past years, are likely to become more common as utility systems begin to show their age. The importance of preventing electrical accidents can never be overemphasized and for this reason, supply of on-line diagnosis system combining information and communication technology(ICT) for the customer's electrical facilities has been increasing recently. The major advantage of on-line diagnosis system is that the device's potential problems could be detected early before a serious deterioration or breakdown occurs. In this paper, We estimated the benefit from the investment in the right of present value of sales, success rate of commercialization regarding R&D investment for development and commercialization of on-line diagnosis technology targeting customer electrical facilities. As a result, the net value added of 29.7 billion won and the increased profit by roughly 7.52 precent are expected.
The Electrical Characteristics of the Antistatic Wafer Carrier
Chea, Jong-Yun ; Yoon, Jong-Kuk ; Kang, Ok-Gu ; Ryu, Bong-Jo ; Koo, Kyung-Wan ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 2, 2014, Pages 319~324
DOI : 10.5370/KIEE.2014.63.2.319
The wafer carrier is made of PP, PC, PE resin which have excellent heat and chemical resistance and electrical properties. However, particle generation has become a problem due to static electricity generated in the carrier. Some conductive material such as carbon black (CB) and carbon fiber (CF) are added for the purpose of anti-static, however, additional for motility and particle contamination problems due to high carbon content occurs. In this paper, the electrical characteristics and workability are observed and compared by adding low Carbon Nono Tube(CNT) to each PP, PC and PE resin to solve the problem.
A Design on the TMS-DCU Interface for Low and High Level Railway Platforms
Kim, Chul-Su ; Kim, Jae-Moon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 2, 2014, Pages 325~330
DOI : 10.5370/KIEE.2014.63.2.325
In order to operate trains both mainline railroad platform and metropolitan subway line platform, it is necessary to develop the door step equipment of the rolling stock regardless of low(500mm, mainline) and high level platforms(1,135mm, metropolitan subway line) because of the requisite door safety system. In this study, TMS-DCU interface is studied for low and high level railway platforms. As a result, Design circuit of TMS(Train Management System)-DCU(Door Control Unit) interface is suitable for telescopic sliding type doorstep unit to minimize damage to the carbody underframe of railway vehicles.