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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 P
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Journal DOI :
The Korean Institute of Electrical Engineers
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Volume & Issues
Volume 59, Issue 4 - Dec 2010
Volume 59, Issue 3 - Sep 2010
Volume 59, Issue 2 - Jun 2010
Volume 59, Issue 1 - Mar 2010
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Development of Education and Training System for the Auto-Reclosing of Power Transmission System Using a Real Time Digital Simulator
Park, Jong-Chan ; Yun, Sang-Yun ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 1, 2010, Pages 1~9
This paper summarizes an education and training system for the auto-reclosing of power transmission system using a real time digital simulator. The system is developed to understand the principle of reclosing and the sequence of automatic reclosing schemes, and practice the effects of reclosing actions to power system in real-time simulator. This study is concentrated into the following two parts. One is the development of real time education and training system of automatic reclosing schemes. For this, we use the RTDS(real time digital simulator) and the actual digital protective relay. The mathematical relay model of RTDS and the actual distance relay which is equipped automatic reclosing function are also used. The other is the user friendly interface between trainee and trainer. The various interface displays are used for user handing and result display. The conditions of automatic reclosing which is a number of reclosing, reclosing dead time, reset time, and so on, can be changed by the user interface panel. A number of scenario cases are reserved for the education and training. Through the test, we verified that the proposed system can be effectively used to accomplish the education and training of automatic reclosing.
Implementation of Methodology & Tool for Communication Safety Guarantee in Railway System
Jo, Hyun-Jeong ; Hwang, Jong-Gyu ; Kim, Yong-Kyu ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 1, 2010, Pages 10~17
Safety-critical systems related to the railway communications are currently undergoing changes. Mechanical and electro-mechanical devices are being replaced by programmable electronics that are often controlled remotely via communication networks. Therefore designers and operators now not only have to contend with component failures and user errors, but also with the possibility that malicious entities are seeking to disrupt the services provided by theirs systems. Recognizing the safety-critical nature of the types of communications required in train control operations, the communications infrastructure will be required to meet a number of safety requirements such as system faults, user errors and the robustness in the presence of malicious attackers who are willing to take determined action to interfere in the correct operation of a system. In this paper, we proposed the safety strategies employed in the railway communications and a security mechanism for Korean railway communication system. Also, we presented the developed means for validation and determination of communication safety based on the proposed security mechanism in the railway system.
A Study on the Characteristic of Capacitor by Asymmetrical Voltage Unbalance
Kim, Jong-Gyeum ; Park, Young-Jeen ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 1, 2010, Pages 18~23
As the increasing of Non-linear load, we have been growing interest for the harmonics. Harmonics has been focused on the current component rather than voltages. Voltage harmonics can be mainly generated at the PCC with non-linear load and act on voltage unbalance. Voltage harmonics can be enlarged at the capacitor with low impedance as frequency increases. Capacitor is basically used for the power-factor compensation and sometimes as the passive filter. Small voltage of low-order acts on quite a few at the capacitor by the current increase. Capacitor has easily fall under by harmonic components. In this paper, we measured the magnitude and phase angle of asymmetrical voltage with harmonics components at the PCC and calculated with the same condition. we concluded that voltage harmonics of higher order increase each current component but have a little effect on capacitor rating.
An Antenna with Combination of Electric-Magnetic Radiators for NotePC Platform
Kim, Yong-Jin ; Kim, Jin-Hwan ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 1, 2010, Pages 24~28
This paper is presented on the antenna design for notepc platform. We present the antenna with combination of electric-magnetic radiator for dual-band Wireless Local Area Network (WLAN) service and a High Speed Downlink Packet Access (HSDPA) service. Due to the limited antenna space in notepc platform, the antennas for various wireless communication service should be located at a very small area. In this paper, the magnetic-type radiator works for high frequency band (1.7 - 2.1 GHz) application and the electric-type radiator works for low frequency band (820 - 960 MHz) application. This combination produces wide-band characteristics in the high frequency band. Simulation and experimental results of input impedance and gain characteristics of the proposed antenna are presented. There are good agreements between the simulated and measured S11 and gain values.
Implementation of an Intelligent Learning Controller for Gait Control of Biped Walking Robot
Lim, Dong-Cheol ; Kuc, Tae-Yong ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 1, 2010, Pages 29~34
This paper presents an intelligent learning controller for repetitive walking motion of biped walking robot. The proposed learning controller consists of an iterative learning controller and a direct learning controller. In the iterative learning controller, the PID feedback controller takes part in stabilizing the learning control system while the feedforward learning controller plays a role in compensating for the nonlinearity of uncertain biped walking robot. In the direct learning controller, the desired learning input for new joint trajectories with different time scales from the learned ones is generated directly based on the previous learned input profiles obtained from the iterative learning process. The effectiveness and tracking performance of the proposed learning controller to biped robotic motion is shown by mathematical analysis and computer simulation with 12 DOF biped walking robot.
The Development of IEC61850 Gateway and the Performance Test
Woo, Chun-Hee ; Lee, Bo-In ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 1, 2010, Pages 35~39
The IT project for power plants initiated domestically in 2005 necessitates the power equipment facility and the controllers for those to be sufficiently adaptable for automation system for power substations. This implies that the power plants using power equipments must be developed to satisfy the IEC61850 standards. The IEC61850 communication standards that all power equipment and facility and controllers installed in automation system for power substations must follow has had its Parts 3 and Part 4 established as international standard in January 2002 and Part 10 in May 2005, the last to become international standard. Hence all separate parts of the original IEC61850 standard came to be established as international standards. As a consequence, after 2005, in most power substations around the world the IEC61850 standard is being applied and the prominent makers are geared towards manufacturing products to the IEC61850 standard. The IEC61850 is being recognized as an essential standard that must be applied to not only power substations but for automation of power systems and communication systems. In this research, the Gateway device that connects current SCADA system and IEC61580 based system has been domesticated with Korea‘s own technology and extensive testing was carried out in order to obtain confidence in its performance.
An Improvement On-Line Failure Diagnosis of DC Link Capacitor in PWM Power Converters
Shon, Jin-Geun ; Na, Chae-Dong ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 1, 2010, Pages 40~46
DC link electrolytic capacitors are widely used in various PWM power converter system, such as adjustable speed driver(ASD) or DC/DC converter. Electrolytic capacitors, which is the most of the time affected by aging effect, plays a very important role for the power electronics system quality and reliability. This objective of this paper is to propose a improvement method to detect the rise of equivalent series resistor(ESR) in order to realize the online failure prediction of electrolytic capacitor for DC link of PWM power converter. The ESR detection scheme is based on the determination of the electrolytic capacitor AC losses calculated from voltage/current measurement using AC coupling. Therefore, the preposed online failure prediction method has the merits of easy ESR computation and circuit simplicity compare with BPF method. Simulation results show the veridity of the proposed on-line ESR estimation method.
High Order Template Scheme for Rapid Acquisition in the UWB Communication System
Baasantseren, Gansuren ; Lin, Xiaoju ; Lee, Hae-Kee ; Kim, Sung-Soo ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 1, 2010, Pages 47~52
The low power of ultra-wideband (UWB) signal makes the acquisition of UWB signal be a more challenging task. In this paper, we propose the method of high order template signal technique that reduces the synchronization time. Experimental results are presented to show the improvements of performance in the mean acquisition time (MAT) and the probability of detection. The performance compared with the serial search, the truly random search and the random permutation search. It is shown that over typical UWB multipath channels, a random permutation search scheme may yield lower MAT than serial search.
Single-Step Adaptive Offset Min-Sum Algorithm for Decoding LDPC Codes
Lin, Xiaoju ; Baasantseren, Gansuren ; Lee, Hae-Kee ; Kim, Sung-Soo ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 1, 2010, Pages 53~57
Low-density parity-check (LDPC) codes with belief-propagation (BP) algorithm achieve a remarkable performance close to the Shannon limit at reasonable decoding complexity. Conventionally, each iteration in decoding process contains two steps, the horizontal step and the vertical step. In this paper, an efficient implementation of the adaptive offset min-sum (AOMS) algorithm for decoding LDPC codes using the single-step method is proposed. Furthermore, the performances of the AOMS algorithm compared with belief-propagation (BP) algorithm are investigated. The algorithms using the single-step method reduce the implementation complexity, speed up the decoding process and have better efficiency in terms of memory requirements.
Respiration Measurement System using Textile Capacitive Pressure Sensor
Min, Se-Dong ; Yun, Young-Hyun ; Lee, Chung-Keun ; Shin, Hang-Sik ; Cho, Ha-Kyung ; Hwang, Seon-Cheol ; Lee, Myoung-Ho ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 1, 2010, Pages 58~63
In this paper, we proposed a wearable respiration measurement system with textile capacitive pressure sensor. Belt typed textile capacitive pressure sensor approach of respiration measurement, from which respiration signatures and rates can be derived in real-time for long-term monitoring, are presented. Belt typed textile capacitive pressure sensor has been developed for this measurement system. the distance change of two plates by the pressure of motion has been used for the respiration measurement in chest area. Respiration rates measured with the textile capacitive pressure sensor was compared with standard techniques on 8 human subjects. Accurate measurement of respiration rate with developed sensor system is shown. The data from the method comparison study is used to confirm theoretical estimates of change in capacitance by the distance change. The current version of respiratory rate detection system using textile capacitive pressure sensor can successfully measure respiration rate. It showed upper limit agreement of
RPM, and lower limit of agreement of
RPM in Bland-Altman plot. From all subject, high correlation were shown(p<0.0001). The proposed measurement method could be used to monitor unconscious persons, avoiding the need to apply electrodes to the directly skin or other sensors in the correct position and to wire the subject to the monitor. Monitoring respiration using textile capacitive pressure sensor offers a promising possibility of convenient measurement of respiration rates. Especially, this technology offers a potentially inexpensive implementation that could extend applications to consumer home-healthcare and mobile-healthcare products. Further advances in the sensor design, system design and signal processing can increase the range and quality of the rate-finding, broadening the potential application areas of this technology.
A Study on Tuning Factor(δ) and Quality Factor(Q) Values in Design of Single-Tuned Passive Harmonic Filters
Cho, Young-Sik ; Cha, Han-Ju ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 1, 2010, Pages 64~70
This paper presents how to decide on tuning factor(
) and quality factor(Q) values in design of single-tuned passive harmonic filters. Tuning factor(
) and quality factor(Q) values have to consider before decision on circuit parameters of passive filters. A Study on these two value has not been scarcely performed and only experienced values has been used in passive harmonic filter design by far. As a experienced value, in cases of 5th and 7th filter, tuning factor(
) is about 0.94 and 0.96 respectively and quality factor(Q) is, in all cases of, 50. If Single-tuned passive harmonic filter will be off-tuned, performance of filter will be decreased steeply and occur to parallel resonance between system reactance and filter capacitance. Therefore During the operation, In order not to off-tuning, Filter must be tuned at former order than actual tuning order. This is the same that total impedance of filter must have a reactive impedance. In this paper, Tuning factor(
) is decided via example of real system and using the bode-plot and then performance of filters confirmed by filter current absorbtion rate. And Quality factor(Q) decided using the bode plot in example system and then performance of filters confirmed by filter current absorbtion rate also, which makes a calculated filter parameters to satisfy IEEE-519 distortion limits. Finally, Performance of the designed passive harmonic filter using the tuning factor(
) and quality factor(Q) values, decided in this paper is verified by experiment and shows that 5th, 7th, 9th, 11th and 13th current harmonic distortions are decreased within IEEE-519 distortion limits, respectively.
Implementation of a Real-Time Data Acquisition System Based on Wireless Communication for Urban Rail Transit Substation
Jung, Ho-Sung ; Park, Young ; Kim, Hyung-Chul ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 1, 2010, Pages 71~76
This paper is focused on implementing a real-time data acquisition system that checks power facility status by applying network based technology to Urban Transit substation power facilities and the results of its on-field tests. This system is composed of a sensor part, a measurement part, a transceiver part, a host computer, and a power source part. The system is designed to collect, save, analyze, and display the online state power facility AI (Analog Input). This system measures voltage and current from positive feeders and negative feeders where it is possible to check abnormalities of the substation‘s main power facilities. By monitoring abnormal data of the Urban Transit power facilities real-time and analyzing stored data, establishing procedures of optimized maintenance is possible.
Evaluation of Characteristics and Reliability of an Auger Crane with Built-in Hydraulic Extender
Kim, Jeom-Sik ; Kwon, Sin-Won ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 1, 2010, Pages 77~82
This study evaluated the characteristics and reliability of an auger crane with a built-in hydraulic extender. The field test of the hydraulic extender was performed with the hydraulic lines filled with hydraulic fluid and free of air. The pressure generated during the test was measured with a digital pressure gauge. The crane was considered to have undergone one cycle of the excavation process after it had performed excavation under three conditions at the same location. This process was performed three times in total. From the results of the excavation using the hydraulic extender, it was found that the maximum pressure and torque measured were 19.9 [MPa] and 895.4 [
], respectively. The rotation force of the auger crane generated at this time signifies a horizontal force. If the excavation diameter of the auger crane is increased, the rotation speed is reduced causing the circumferential speed to also be reduced. The torsional shear stress of the extendable auger crane was calculated to be approximately 23.5 [MPa]. However, the rotation shaft material used for this system was carbon steel for machine structural use (SM45C). Since the minimum torsional yield stress is greater than 150 [MPa] according to KS D 3752, it means the equipment has secured a safety factor greater than 6. Therefore, it was found that when performing work using the extendable auger crane, it exhibited no problems with the safety and reliability of its shaft.
Development of Live-line Insulator Tester and Its Application to 154kV Power Lines - Part 1 : Tester Development
Lee, Jae-Kyung ; Park, Joon-Young ; Cho, Byung-Hak ; Oh, Ki-Yong ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 1, 2010, Pages 83~88
A new live-line insulator tester was developed to detect faulty insulators in 154kV power transmission lines. This paper is the first part of the two-part paper and deals with its tester development. The developed tester has the following characteristics. First, it automates parts of the insulator inspection process by using a sensor and an actuator, and secondly, it sustains its weight by itself, not by a lineman. Finally, it measures the insulation resistance of an insulator together with its distribution voltage to provide more information for its analysis and diagnosis. These leads to the improvement of its operation efficiency, measurement reliability and usability. Its effectiveness was validated by live-line field tests in actual power lines.
Development of Live-line Insulator Tester and Its Application to 154kV Power Lines - Part 2 : Inspection Algorithm Development
Park, Joon-Young ; Lee, Jae-Kyung ; Cho, Byung-Hak ; Oh, Ki-Yong ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 1, 2010, Pages 89~95
A new live-line insulator tester was developed to detect faulty insulators in 154kV power transmission lines. This paper is the second part of the two-part paper and deals with its inspection algorithm development. Unlike normal condition with low pollution and low humidity, the inspection data measured in the field under high pollution or high humidity showed that the voltage distribution of an insulator string has offsets in comparison with those of others and its insulation resistances are greatly decreased, which leads to wrong results of the existing inspection algorithms under such conditions. To solve this problem, we propose new diagnosis algorithms that can exactly detect faulty insulators from measured data regardless of environmental conditions. Its effectiveness was validated by live-line field tests in actual power lines.
Inspection of the Diagnosis Report for Life Assessment of Engine Generator
Lee, Young-Jun ; Ju, Young-Ho ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 1, 2010, Pages 96~99
This paper presents evaluating procedure for engine generator operated over 13 years which are usually installed at the island and therefore, isolated to the main distribution line. To decide continual operation of the generator, their diagnosis results should guarantee safety running. So the determination of criteria for continual usage or replacement is essential for economical and reliable maintenance. We present all the courses of evaluating the condition which includes the processes from acquiring basic data to comprehensive determination of generators. All the test was applied to serial number 3 generator in Jodo Engine Power Plant.
The Study on Permissible Capacity of Distributed Generation Considering Voltage Variation and Load Capacity at the LV Distribution Power System
Moon, Won-Sik ; Cho, Sung-Min ; Shin, Hee-Sang ; Lee, Hee-Tae ; Han, Woon-Ki ; Choo, Dong-Wook ; Kim, Jae-Chul ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 1, 2010, Pages 100~105
This paper describes a capacity of distributed generation which will be interconnected at low voltage distribution systems. In order to set the capacity of distributed generation, a voltage variation of distribution system is considered. Besides, the capacity of distributed generation is classified according to a capacity of pole transformer and loads. The system constructions in this paper are analyzed by using PSCAD/EMTDC. In the immediate future, it is expected to increase the installation of New and renewable energy systems which are generally interconnected to distribution power systems in the form of distributed generations like photovoltaic system, wind power and fuel cell. So the study of this kind would be needed to limit the capacity of distributed generation.
A Study of an Application Scheme for Smart Meter and Value Added Services Based on Korean Environment
Kim, Seok-Gon ; Lee, Han-Byul ; Lee, Young-Joo ; Choi, Yong-Sung ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 1, 2010, Pages 106~111
Electronic watt hour meters(WHM) for high pressure running in domestic were installed to the digital type meter and ones for low pressure are expected to complete within several years. Domestic power metering technology is being beyond a simple framework with an electronic type and is rapidly evolving to intelligent smart metering systems in conjunction with promotion of a national smart grid project. Major policy outlook of the world's major power company regarding Intelligent metering is the application of the fare structure diversification and is the improvement of level of service to customers. In addition, electric power companies should focus on the cost reduction and the improvement of management efficiency through an efficient operation of distribution facility. In this paper, we are about to make an observation of the additional services technology development trend of the overseas smart meter and to have a view of value-added services(VAS) system of smart meter suitable for the domestic environment based on the technology development of VAS utilizing electronic watt hour meter performed by recent research projects.
A Study on the I-V and I-P Characteristics for Optimized Operation of PEMFC
Jung, You-Ra ; Choi, Young-Sung ; Lee, Kyung-Sup ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 1, 2010, Pages 112~116
Fuel cell as a renewable energy source is clean and has a lot of advantages. The source can solve energy crisis and environmental problems such as greenhouse effect, air pollution and the ozone layer destruction. This paper introduces hybrid system(hydro-Genius Professional, heliocentris) of solar cell and fuel cell. Also, this paper shows the I-P, V-I characteristics of fuel cells which are connected in parallel and series. From these results, we also found the maximum power was transferred at 0.5[
]. The terminal voltage was also decreased according to the current because of the internal resistance. The power transfer in series was two times than that in parallel.
Economical Feasibility Evaluation of Solar-Fuel Cells in Hybrid Energy System for Domestic Electricity Demands
Li, Ying ; Choi, Young-Sung ; Zhang, You-Sai ; Lee, Kyung-Sup ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 1, 2010, Pages 117~122
The solar cells and fuel cells power are being encouraged to reduce the environmental pollution and combat the global warming. And the electric generation hybrid system is usually more reliable and less costly than the systems that use a single source of energy. HOMER provides a platform to design and simulate the power system and then to choose the optimization results. Based on the electricity demand conditions during a year, this paper simulates with the HOMER and performs the monthly average electrical production and the most feasible economical case includes the net present costs and the annualized costs of the hybrid system components.
Triangular Ring Resonator Without Direct Coupling Between Two Access Waveguides of Multimode Interference Coupler
Kim, Doo-Gun ; Kim, Hyo-Jin ; Kim, Seon-Hoon ; Ki, Hyun-Chul ; Kim, Hwe-Jong ; Oh, Geum-Yoon ; Choi, Young-Wan ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 1, 2010, Pages 123~128
We have investigated the properties of the novel triangular ring resonator with the total internal reflection mirrors and the semiconductor optical amplifier for photonic integrated circuits (PIC). A novel triangular resonators containing active and passive sections are fabricated and characterized with various multimode interference (MMI) lengths. The optimum MMI length and width turn out to be 108 and 9
, respectively. A free spectral range of approximately 228 GHz is observed near 1558 nm along with an on-off ratio of 9 dB. The proposed triangular resonator has a good advantage to remove the direct coupling between the two access waveguides of the MMI coupler. Hence, such resonators can be directly integrated with other devices making compact and highly functional PIC possible.
Optimization of Residential Photovoltaic-Fuel Cell Hybrid System Using HOMER
Park, Se-Joon ; Li, Ying ; Choi, Young-Sung ; Lee, Kyung-Sup ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 1, 2010, Pages 129~133
A hybrid system which is combined several complementary new and renewable power sources, such as photovoltaic, fuel-cell, and wind generator, etc., has been presented in various approaches. For instance, a photovoltaic cannot always generate stable output power with ever-changing weather condition, so it might be co-generated with a wind generator, diesel generator, and some other sources. In this paper, a residential PV-FC hybrid system is suggested as a distribution power source, and its operation is optimized by HOMER
. As a result, it is the most economic that 5[kW] PV, 1[kW] FC, 4 batteries, 2[kW] electrolyzer, 0.5[kg]
tank, 3[kW] converter are applied to the hybrid system.