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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 57, Issue 12 - Dec 2008
Volume 57, Issue 11 - Nov 2008
Volume 57, Issue 10 - Oct 2008
Volume 57, Issue 9 - Sep 2008
Volume 57, Issue 8 - Aug 2008
Volume 57, Issue 7 - Jul 2008
Volume 57, Issue 6 - Jun 2008
Volume 57, Issue 5 - May 2008
Volume 57, Issue 4 - Apr 2008
Volume 57, Issue 3 - Mar 2008
Volume 57, Issue 2 - Feb 2008
Volume 57, Issue 1 - Jan 2008
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Development of Automatic Judgement System of Radial T/L System for Preventing Power Device's Wrong Control in SCADA
Jeon, Dong-Hoon ; Kim, Tae-Won ; Shim, Jeong-Woon ; Kim, Kern-Joong ;
The Transactions of The Korean Institute of Electrical Engineers, volume 57, issue 1, 2008, Pages 1~7
In this paper, we proposed the method judging whether transmission system is radial system or loop system using simple set theory. And we proposed the method judging whether power device's operation causes of blackout or not. Using proposed method, we developed automatic judgement system of radial system for preventing power device's wrong control in SCADA. Finally, we simulated a variety of case study using SCADA simulator with developed system, and verified reliability of the result and performance of developed system.
Implementation of Auto-reclosing Relay Algorithm based on Multi-Agent System using EMTP-MODELS
Lee, Byung-Hyun ; Yeo, Sang-Min ; Lee, You-Jin ; Kim, Chul-Hwan ; Sung, No-Kyu ;
The Transactions of The Korean Institute of Electrical Engineers, volume 57, issue 1, 2008, Pages 8~13
This paper presents auto-reclosing algorithms with reference to power system stability based on MAS(Multi-Agent System). And this paper shows auto-reclosing algorithms considering power system stability. It includes the variable dead time, optimal reclosing, sequential reclosing, emergency extended equal-area criterion(EEEAC) algorithm, and modified EEEAC algorithm. This paper divides Auto-reclosing algorithms into respectively agents according to their tasks. A separated agent is merely a software entity that is situated in some environment and is able to autonomously react to changes in the environment. And all the simulations in this parer were tested by EMTP MODELS.
A Study on the Communication Test of Substation Automation System based on IEC 61850
Lee, Nam-Ho ; Jang, Byung-Tae ;
The Transactions of The Korean Institute of Electrical Engineers, volume 57, issue 1, 2008, Pages 14~19
In order to verify a substation automation system based on IEC 61850, Korea Electric Power Research Institute under the project related to SAS has constructed IED testing system, which consists of HMI, IED(Intelligent Electronic Device), network equipment, V/I generator, and performed a various of communication tests such as the interoperability test between two IEDs made by other vendors. The test was proceeded based on SCL(Substation Configuration Description Language). This paper presents ways and procedures to simulate those tests and solutions to clear up SCL based engineering problems and compatibility among the individual manufacture tools.
Supply Function Nash Equilibrium Considering Stochastic Demand Function
Lee, Kwang-Ho ;
The Transactions of The Korean Institute of Electrical Engineers, volume 57, issue 1, 2008, Pages 20~24
A bid-based pool(BBP) model is representative of energy market structure in a number of restructured electricity markets. Supply function equilibrium(SFE) models of interaction better match what is explicitly required in the bid formats of typical BBP markets. Many of the results in the SFE literature involve restrictive parametrization of the bid cost functions. In the SFE models, two parameters, intercept and slope, are available for strategic bidding. This paper addresses the realistic competition format that players can choose both parameters arbitrarily. In a fixed demand function, equilibrium conditions for generation company's profit maximization have a degree of freedom, which induces multi-equilibrium. So it is hard to choose a convergent equilibrium. However, consideration of stochastic demand function makes the equilibrium conditions independent each other based on the amount of variance of stochastic demand function. This variance provides the bidding players with incentives to change the slope parameter from an equilibrium for a fixed demand function until the slope parameter equilibrium.
An Analysis of Location Marginal Prices Considering Demand Response Resources
Kim, Hyun-Houng ; Kim, Jin-Ho ; Kim, Hyeong-Jung ; Shin, Joong-Rin ; Park, Jong-Bae ;
The Transactions of The Korean Institute of Electrical Engineers, volume 57, issue 1, 2008, Pages 25~33
This paper presents a new approach of a evaluation of location marginal prices(LMPs) considering demand response resources in the competitive electricity market. The stabilization of the electric power supply and demand balance has been one of the major important activities in electric power industry. Recently, much attention is paid to the demand-side resources which are responsive to incentives or time-varying prices and existing power system planning and operation activities are incorporated with the so-called demand response resources. In this paper, we first present an analytical method for calculation of LMPs considering demand response resources and then break down the LMPs into three components. In this study, we assume that Korean power system consists of two major regions, one which is the metropolitan and the other is non-metropolitan region. In the case study, we have considered several LMPs cases with different use of locational demand response resource and we can obtain a locational signal to demand response resources. Also, the economics of demand response resources are evaluated, compared with the increase of transmission line capacity and of generation capacity.
Effect of Generation Capacity Constraints on a Mixed Strategy Nash Equilibrium in a Multi-Player Game
Lee, Kwang-Ho ;
The Transactions of The Korean Institute of Electrical Engineers, volume 57, issue 1, 2008, Pages 34~39
Nash Equilibrium(NE) is essential to investigate a participant's bidding strategy in a competitive electricity market. Congestion on a transmission line makes it difficult to compute the NE due to causing a mixed strategy. In order to compute the NE of a multi-player game, some heuristics are proposed with concepts of a key player and power transfer distribution factor in other studies. However, generation capacity constraints are not considered and make it more difficult to compute the NE in the heuristics approach. This paper addresses an effect of generation capacity limits on the NE, and suggest a solution technique for the mixed strategy NE including generation capacity constraints as two heuristic rules. It is reported in this paper that a role of the key player who controls congestion in a NE can be transferred to other player depending on the generation capacity of the key player. The suggested heuristic rules are verified to compute the mixed strategy NE with a consideration of generation capacity constraints, and the effect of the generation constraints on the mixed strategy NE is analyzed in simulations of IEEE 30 bus systems.
Optimal Design of Permanent Magnet Actuator Using Parallel Genetic Algorithm
Kim, Joong-Kyoung ; Lee, Cheol-Gyun ; Kim, Han-Kyun ; Hahn, Sung-Chin ;
The Transactions of The Korean Institute of Electrical Engineers, volume 57, issue 1, 2008, Pages 40~45
This paper presents an optimal design of a permanent magnet actuator(PMA) using a parallel genetic algorithm. Dynamic characteristics of permanent magnet actuator model are analyzed by coupled electromagnetic-mechanical finite element method. Dynamic characteristics of PMA such as holding force, operating time, and peak current are obtained by no load test and compared with the analyzed results by coupled finite element method. The permanent magnet actuator model is optimized using a parallel genetic algorithm. Some design parameters of vertical length of permanent magnet, horizontal length of plunger, and depth of permanent magnet actuator are predefined for an optimal design of permanent magnet actuator model. Furthermore dynamic characteristics of the optimized permanent magnet actuator model are analyzed by coupled finite element method. A displacement of plunger, flowing current of the coil, force of plunger, and velocity of plunger of the optimized permanent magnet actuator model are compared with the results of a primary permanent magnet actuator model.
Development of Evaluating Technology for the Capability of Carrying Short-Circuit Current at Electrical Contacts in EHV Disconnecting Switches
Oh, Yeon-Ho ; Song, Ki-Dong ; Chong, Jin-Kyo ;
The Transactions of The Korean Institute of Electrical Engineers, volume 57, issue 1, 2008, Pages 46~51
Extra-high voltage(EHV) disconnecting switch(DS) consists of the electrical contacts and mechanical parts which actuate the contacts. When the short-circuit condition occurs, a large amount of current flows through the electrical contact in disconnecting switches and this causes considerable temperature rise due to Joule heating. If the temperature rise is higher than the melting point of contact material, the DS contact becomes melting and cannot be usable anymore. For this reason, the analysis for capability of carrying short-circuit current in DS contacts must be performed at a design stage. Here, we proposed a numerical technique for evaluating the capability of carrying short-circuit current at electrical contacts in EHV DS. In this numerical approach, the mechanical and thermal analyses were simulated to check the capability of carrying short-circuit current. First, the applied pressure at contact parts was analyzed considering the mechanical properties, and then contact resistance was calculated by an empirical equation. Finally, thermal analysis was performed with resistance variation at electrical contacts. To verify these numerical results, the distributions of temperature in DS were experimentally measured and compared with each other. The results from experiments were agreed well with those from the proposed numerical simulations.
Design and Analysis of A Rectangular Type Core for A Contactless Power Transmission system
Jin, Kang-Hwan ; Kim, Ji-Min ; Kim, Soo-Hong ; Kim, Eun-Soo ; Kim, Yoon-Ho ;
The Transactions of The Korean Institute of Electrical Engineers, volume 57, issue 1, 2008, Pages 52~57
In the transformer that is used for the contactless power transmission system, the primary and secondary sides are separated structurally unlike general transformers. When the contactless transformer is built, it forms relatively bigger air gap than the general transformer. Thus it is difficult to transfer energy from the primary side input to the secondary side output with high power efficiently because of low coupling coefficient. This paper proposes a contactless transformer using the rectangular type core that maintains high coupling coefficient even when it has relatively large air gap. The performance characteristics of the proposed transformer are compared with the transformer using general EE core to the air gap variation. The proposed contactless system using rectangular type core and dc-dc full bridge converter, and the system using EE core type and dc-dc full bridge converter are respectively implemented and their performance characteristics are verified by the simulation and experiment.
The Anti-Islanding Method with Compensation of Load Reactive Power for Grid-connected Photovoltaic Generation System
Jeong, Jin-Beom ; Shin, Dong-Hyun ; Kim, Hee-Jun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 57, issue 1, 2008, Pages 58~64
In this paper, we present an active anti-islanding method with a load monitoring system using reactive power control. The proposed method, which is based on reactive power control, has fewer harmonics components than those in conventional methods, and it can minimize the reactive power component of the grid because it compensates the reactive power component with the load monitoring. The proposed quick islanding detection method was confirmed from the experimental results with an inverter for a 3kW photovoltaic system.
Novel Islanding Detection Method for Distributed Generation Interconnected with Utility Grid
Bae, Byung-Yeol ; Lee, Doo-Young ; Ko, Jong-Sun ; Choi, Nam-Sub ; Han, Byung-Moon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 57, issue 1, 2008, Pages 65~72
This paper describes the development of a novel islanding detection method, which uses the signal cross-corelation scheme between the injected reactive current and the power frequency deviation. The existing method, which injects the reactive current of 2.5-5% to the rated current and detects the frequency deviation directly, brings about lowing the power quality due to the harmonic pollution. The proposed method eliminates the weak point of the existing method, because it injects the reactive current less than 1% to the rated current. The operational feasibility was verified through computer simulations with PSCAD/EMTDC software, and experimental works with a 10kVA hardware prototype. The proposed method can detect the islanding status effectively without lowing the power quality of interconnected distributed generation system.
A Study on the Dielectric Polarization of
Structure Organic Light-emitting Diodes
Oh, Yong-Cheul ; Shin, Cheol-Gi ; Kim, Chung-Hyeak ;
The Transactions of The Korean Institute of Electrical Engineers, volume 57, issue 1, 2008, Pages 73~77
We have investigated dielectric polarization in organic light-emitting diodes using 8-hydroxyquinoline aluminum(
) as an electron transport and emissive material. We analyzed the dielectric polarization of organic light-emitting diodes using characteristics of impedance and equivalent circuit of
. Impedance characteristics was measured complex impedance Z and phase
in the frequency range of
. We obtained complex electrical conductivity, dielectric constant, and loss tangent(tan
) of the device at room temperature. And, we obtained the equivalent circuit of
through analyzing dielectric constant and dielectric loss tangent. From these analyses, we could interpret a conduction mechanism and dielectric polarization.
Development of a Plasma Gun System for Ion Plating with Long Lifetime
Choi, Young-Wook ;
The Transactions of The Korean Institute of Electrical Engineers, volume 57, issue 1, 2008, Pages 78~81
A hollow cathode which has extremely stable discharge characteristic has been developed. This is composed of the two separated lanthanum hexaboride(LaB6) of a disk type in the tube as the electron emitters. The way of design is of great advantage to extend the surface discharge area of the LaB6, which is also useful for optimal fixing of the LaB6. The hollow cathode is capable of producing 30 kW(100 V, 300 A) of power continuously. Because the generated plasma beam with the high temperature(above
) from the hollow cathode passes through the center hole of the two intermediate electrodes, it is designed with the high temperature material of the tungsten and the suitable structure of the water cooling. The combinations of the hollow cathode and the two intermediate electrodes are practically useful for the ion plating plasma beam source.
The Accident Hazard and Material Analysis of Power Cable due to Thermal Stress under PL System
Kim, Young-Seok ; Shong, Kil-Mok ; Jung, Jin-Su ; Jung, Jong-Wook ; Kim, Sun-Gu ; Kim, Sang-Hyun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 57, issue 1, 2008, Pages 82~87
It is impossible to database(DB) the patterns of power cable events and cause analysis of faulted cable because the product liability(PL) law have been enforced in Korea, since 2002. In additions, simulation and pattern of power cable events are needed for DB system under accelerated deterioration. In this paper, we tested for resistance to cracking of cable below the 22.9kV class due to thermal stresses. This method of exam is following IEC 60811-3-1(Common test methods for insulating and sheathing materials of electric cables). From the results, The 22.9kV calss A power cable was discolored on the surface and significantly reduced in the longitudinal direction. As the thermal weight properties of A power cable was definitely varied, we are able to guess the problem of manufacture. If the cable was defect by the manufacture, the victims would be able to claim for damage in the PL system.
Electroluminescent Characteristics of Organic Thin Film
Moon, Jong-Dae ;
The Transactions of The Korean Institute of Electrical Engineers, volume 57, issue 1, 2008, Pages 88~91
Electroluminescent(EL) devices based on organic thin films are considered to be one of the next generation of flat-panel displays. In this paper, we have investigated electro-luminescent(EL) characteristics of organic EL device using
, PBD as emitting material. Current and luminance can be seen that express a similar relativity in voltage and could know that luminance is expressing current relativity.
Implementation of Stimulated Brillouin Scattering in Optical Fiber Sensor for Improved Stability by Using Neuro-Fuzzy Theory
Hwang, Kyoung-Jun ; Yeom, Keong-Tae ; Kim, Yong-Kab ;
The Transactions of The Korean Institute of Electrical Engineers, volume 57, issue 1, 2008, Pages 92~97
This is a research to apply 1310nm single-mode optical fiber to a temperature sensor. The existing study of optical fiber sensor is complicated because it was made with various equipment. To vary scattering, the variation of optical frequency is measured by using Bragg(lattice) or pulse generator and also bulk system is created by YAG laser but there were some difficulties creating experimental environment and it was a problem that the stability of measured data was low. The temperature sensor system using the suggested sBs(stimulated Brillouin scattering:sBs) from this research is much more simplified straight-line system. To improve the trust and accuracy of noises from optical frequency and unclear results, it was analysed by using Neuro-Fuzzy algorithm. we tried to get more correct data than existing system. sBs measure that optical frequency changed due to the variation of temperature. The analyzed change rate of outcome by Fuzzy theory is 1.1 MHz.
Design of the RLG Current Stabilizer for Attitude Control in the Satellite
Kim, Eui-Chan ; Lee, Heung-Ho ;
The Transactions of The Korean Institute of Electrical Engineers, volume 57, issue 1, 2008, Pages 98~101
In this paper, we describe the RLG current stabilizer circuit for attitude control in the satellite. The RLG makes use of the Sagnac effect within a resonant of a HeNe laser. The difference between two discharge currents causes one of the gyro bias errors. The theoretical background and current stabilizer are introduced. It is verified that the circuit designed is applicable to the test of input voltage and temperature.
Robust Adaptive Control of 3D Crane Systems with Uncertainty
Jeong, Sang-Chul ; Kim, Dong-Won ; Lee, Hyung-Ki ; Cho, Hyun-Cheol ;
The Transactions of The Korean Institute of Electrical Engineers, volume 57, issue 1, 2008, Pages 102~108
This paper presents robust and adaptive control method for complicated three dimensional crane systems with uncertain effect. We consider an overhead crane system in which a trolly located on its top is moved to x- and y-axis independently. We first approximate the complicated crane model through linearization approach to simply construct a PD control and then design an adaptive control system for compensating modeling error and control deviation which is feasibly occurred due to system perturbation in practice. An adaptive control scheme is analytically derived using Lyapunov stability theory for a given bound of system perturbation. We accomplish numerical simulation for evaluation of the proposed control system and demonstrate its superiority comparing with the traditional control strategy.
Model Matching of Asynchronous Sequential Machines with Input Disturbance
Yang, Jung-Min ;
The Transactions of The Korean Institute of Electrical Engineers, volume 57, issue 1, 2008, Pages 109~116
Model matching problem of asynchronous sequential machines is addressed in this paper. The main topic is to design a corrective controller such that the closed-loop behavior of the asynchronous sequential machine can follow a given model, i.e., their models can be "matched" in stable states. In particular, we assume that the considered asynchronous machine suffers from the presence of an input disturbance that can cause undesirable state transitions. The proposed controller can realize both model matching and elimination of the adverse effect of the input disturbance. Necessary and sufficient condition for the existence of a corrective controller that solves model matching problem is presented. Whenever controller exists, algorithms for their design are outlined and demonstrated in a case study.
A Study on the Convergence Condition of ILC for Linear Discrete Time Nonminimum Phase Systems
Bae, Sung-Han ; Ahn, Hyun-Sik ; Jeong, Gu-Min ;
The Transactions of The Korean Institute of Electrical Engineers, volume 57, issue 1, 2008, Pages 117~120
This paper investigates the convergence condition of ADILC(iterative learning control with advanced output data) for nonminimum phase systems. ADILC has simple learning structure including both minimum phase and nonminimum phase systems. However, for nonminimum phase systems, the overall time horizon must be considered in input update law. This makes the dimension of convergence condition matrix large. In this paper, a new sufficient condition is proposed to satisfy the convergence condition. Also, it has been shown that this sufficient condition can be satisfied although it is not full impulse response.
3-D Working Point Decision Method for Industrial Robot
Ryu, Hang-Ki ; Lee, Jae-Kook ; Kim, Byeong-Woo ; Choi, Won-Ho ;
The Transactions of The Korean Institute of Electrical Engineers, volume 57, issue 1, 2008, Pages 121~127
In this paper, we propose a new 3-D working point determination method for industrial robot using vision camera system and block interpolation technique with feature points in a vehicle body. To detect the feature points in a vehicle body, we applied the pattern matching method. For determination of working point, we applied block interpolation method. The block consists of 3-D type blocks with detected feature points per section. 3-D position is selected by Euclidean distance between 245 feature values and an acquired feature point. In order to evaluate the proposed algorithm, experiments are performed in glass equipment process in real industrial vehicle assembly line.
Fault Tolerant Cache for Soft Error
Lee, Jong-Ho ; Cho, Jun-Dong ; Pyo, Jung-Yul ; Park, Gi-Ho ;
The Transactions of The Korean Institute of Electrical Engineers, volume 57, issue 1, 2008, Pages 128~136
In this paper, we propose a new cache structure for effective error correction of soft error. We added check bit and SEEB(soft error evaluation block) to evaluate the status of cache line. The SEEB stores result of parity check into the two-bit shit register and set the check bit to '1' when parity check fails twice in the same cache line. In this case the line where parity check fails twice is treated as a vulnerable to soft error. When the data is filled into the cache, the new replacement algorithm is suggested that it can only use the valid block determined by SEEB. This structure prohibits the vulnerable line from being used and contributes to efficient use of cache by the reuse of line where parity check fails only once can be reused. We tried to minimize the side effect of the proposed cache and the experimental results, using SPEC2000 benchmark, showed 3% degradation in hit rate, 15% timing overhead because of parity logic and 2.7% area overhead. But it can be considered as trivial for SEEB because almost tolerant design inevitably adopt this parity method even if there are some overhead. And if only parity logic is used then it can have
advantage than ECC logic. By using this proposed cache, the system will be protected from the threat of soft error in cache and the hit rate can be maintained to the level without soft error in the cache.
Fabrication of Biochip Using Gray-scale Photolithography
Bae, Young-Min ;
The Transactions of The Korean Institute of Electrical Engineers, volume 57, issue 1, 2008, Pages 137~141
Biochip, which implements bioanalytical process on a tiny surface, is one of candidates for medical diagnosis, drug screening, and molecular sensing. In general, a type of biochip based on microfluidics is composed of microcomponents including microchannel, pump, and valve, which require complicated processes. In this study, gray-scale photolithography(GSPL) was applied to fabricate a biochip with multiple layers. A mould for casting PDMS(polydimethylsiloxane) channel, was fabricated using GSPL. A gray-photomask was prepared by printing gray patterns on a high-quality glossy paper followed by photoreducing by 10:1 onto the photo-film. The formation of multiple layers was studied according to the change of gray level of pattern and the developing time. A biochip composed of a weir(multiple layer structure) and a reaction chamber in a single microchannel was fabricated in a glass plate. Finally, we investigated the application of biochip to antigen-antibody reaction by packing the microbead coated with antibody.
Zigbee Based Wireless Respiration Monitor System
Lee, In-Kwang ; Kim, Seong-Sik ; Jang, Jong-Chan ; Kim, Koon-Jin ; Kim, Kyung-Ah ; Lee, Tae-Soo ; Cha, Eun-Jong ;
The Transactions of The Korean Institute of Electrical Engineers, volume 57, issue 1, 2008, Pages 142~147
Abdominal circumference changes due to breathing by the respiratory muscle activity such as diaphragm, which would partially represent the lung volume variation. The present study introduced conductive rubber molded in a cord shape incorporated with a patient's pants. The conductive rubber cord operated as a displacement transducer to measure the lung or abdominal volume changes. Signal extraction circuitry was developed to obtain the volume and its derivative(or the flow) signals followed by wireless transmission based on the Zigbee communication protocol in a size of
easily put in pocket. Breathing frequency was accurately evaluated and breath pattern analysis seemed feasible, since respiratory behaviours such as maximal inspiration and cough were well identified. Remote wireless receiver module also enabled to monitor both volume and flow signals during resting breathing on a PC terminal.