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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 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
Selecting the target year
Generation Rescheduling Considering Generation Fuel Cost and CO
Kim, Kyu-Ho ; Rhee, Sang-Bong ; Song, Kyung-Bin ; Hwang, Kab-Ju ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 5, 2013, Pages 591~595
DOI : 10.5370/KIEE.2013.62.5.591
This paper presents a method of generation rescheduling using Newton's Approach which searches the solution of the Lagrangian function. The generation fuel cost and
emission cost functions are used as objective function to reallocate power generation while satisfying several equality and inequality constraints. The Pareto optimum in the fuel cost and emission objectives has a number of non-dominated solutions. The economic effects are analyzed under several different conditions, and
emission reductions offered by the use of storage are considered. The proposed approach can explore more efficient and noninferior solutions of a Multiobjective optimization problem. The method proposed is applied to a 4-machine 6-buses system to demonstrate its effectiveness.
Optimal Microgrid Operation Considering Fuel Cell and Combined Heat and Power Generation
Lee, Ji-Hye ; Lee, Byung Ha ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 5, 2013, Pages 596~603
DOI : 10.5370/KIEE.2013.62.5.596
The increase of distributed power generation is closely related to interest in microgird including renuable energy sources such as photovoltaic (PV) systems and fuel cell. By the growing interest of microgrid all over the world, many studies on microgrid operation are being carried out. Especially operation technique which is core technology of microgrid is to supply heat and electricity energy simultaneously. Optimal microgrid scheduling can be established by considering CHP (Combined Heat and Power) generation because it produce both heat and electricity energy and its total efficiency is high. For this reason, CHP generation in microgrid is being spotlighted. In the near future, wide application of microgrid is also anticipated. This paper proposes a mathematical model for optimal operation of microgrid considering both heat and power. To validate the proposed model, the case study is performed and its results are analyzed.
Case Study of Second Harmonic Generation under Nonlinear Load and Second Harmonic Elimination Method Based on Impedance Variation Scheme
Bang, Heegyun ; Kim, Sikyung ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 5, 2013, Pages 604~611
DOI : 10.5370/KIEE.2013.62.5.604
This paper presents an second harmonic elimination method based on the impedance variation scheme. Through the power quality analysis from the nonlinear loads connected on the power system, the second harmonic problems have been analyzed with a case study analysis and the experiments. In the paper, the second Harmonic generation was simulated with a single phase SCR rectifier and the analytical model is proposed for the second harmonic generation. A novel impedance variation scheme is proposed and analyzed to eliminate the second harmonic. The experiment has been performed on the 60(MVA) industry manufacturing plant. The experimental result demonstrates the proposed impedance variation scheme successfully operate on the 60(MVA) industry manufacturing plant.
Early Detection Technique in IPM-type Motor with Stator-Turn Fault using Impedance Parameter
Jeong, Chae-Lim ; Kim, Kyung-Tae ; Hur, Jin ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 5, 2013, Pages 612~619
DOI : 10.5370/KIEE.2013.62.5.612
This paper proposes an early diagnosis technique for the stator-turn fault (STF) in an interior permanent magnet (IPM)-type brushless DC (BLDC) motor using the impedance parameter. We have analyzed the varying characteristics owing to the STF through various experiments and the finite element method (FEM). As a result, we have presented a simple method for fault detection. This technique can be applied without requiring a fast Fourier transform (FFT) and the calculation of the negative-sequence impedance. The fault detection system works on the basis of the comparison the measured impedance with the database impedance. The variations in the characteristics owing to the STF as well as the proposed technique have been verified through the simulation and experiment.
Design of a Switched Reluctance Motor Driving an Electric Compressor for HEVs
Jeong, Yong-Hoe ; Jeon, Yong-Hee ; Kang, Jun-Ho ; Kim, Jaehyuck ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 5, 2013, Pages 620~625
DOI : 10.5370/KIEE.2013.62.5.620
This paper presents the design of a switched reluctance motor (SRM) for electric air conditioning compressors which are applied to hybrid electric vehicles (EVs). The motor for driving air conditioning compressor which is recently used on EV(electric vehicle) / HEV (hybrid electric vehicle) is PMSM(permanent magnet synchronous motor) or BLDCM(brushless DC motor). However disadvantage of motors that uses permanent magnets are vulnerable to high temperatures because of the demagnetization by the high temperature and the permanent magnet is expensive because of the high price of rare earth materials from China's monopoly. Therefore, in the automotive insustry is interested in the non-rare-earth motors. SRM has many advantages. it's resistant to high temperatures, price is cheaper, because there are no permanent magnets and winding in the rotor. Also it's high relability and efficiency, suitable for high-speed operation because of structure is simple. In this paper, the SRM, non-rare-earth motor, are designed, analyzed and experimented drive to replace an existing electric compressor drive motor.
Start-up Analysis and Commissioning Test of LCI System for 183MW Large Synchronous Machine
Ryu, Hoseon ; Cha, Hanju ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 5, 2013, Pages 626~631
DOI : 10.5370/KIEE.2013.62.5.626
Gas turbine systems are applied extensively in energy supplies to cover peak load requirements. The gas turboset must be accelerated by starting device up to 60%~80% of rated speed to ignite the gas turbine. Recently, the most favorable and economical starting device is the LCI(Load Commutated Inverter). The LCI runs up the gas turboset by feeding the generator as a synchronous motor. In this paper, we discuss in detail the driving principles and features of 183MW gas turbine system. During field application of LCI system, many tests have been conducted and the results were described in this paper. The test results will be considered as the important resources for development in future.
A Study on the Operation Characteristic of Induction Generator in the Small Hydropower Plant
Kim, Young-Kuk ; Kim, Jong-Gyeum ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 5, 2013, Pages 632~638
DOI : 10.5370/KIEE.2013.62.5.632
In this study, we described voltage fluctuation characteristics of distribution line during starting and normal operation condition of the small hydro generators. Based on these theories, we scrutinized the starting and operating characteristics of induction generators installed in two small hydro power plants that is connected to the distribution line and researched necessary factors when selecting the generator type. The type of turbines and capacity of generators are different. One is below 1,000kW and the other is above 1,000kW. Two generators are tested during starting, and it acts as motor not generator at the instant that the machine is connected to the grid. After connecting to the grid, the machine rotates above synchronous speed before converting to the generator mode. Therefore the characteristic of the generator during starting is same as it of motor.
A Nuclear Event Detectors Fabrication and Verification for Detection of a Transient Radiation
Jeong, Sang-Hun ; Lee, Seung-Min ; Lee, Nam-Ho ; Kim, Ha-Chul ; Cho, Seong-Ik ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 5, 2013, Pages 639~642
DOI : 10.5370/KIEE.2013.62.5.639
In this paper, proposed NED(nuclear event detectors) for detection of a transient radiation. Nuclear event detector was blocked of power temporary for defence of critical damage at a electric device when a induced transient radiation. Conventional NED consist of BJT, resistors and capacitors. The NED supply voltage of 5V and MCM(Multi Chip Module) structures. The proposed NED were designed for low supply voltage using 0.18um CMOS process. The response time of proposed NED was 34.8ns. In addition, pulse radiation experiments using a electron beam accelerator, the output signal has occurred.
A Study of Corona Discharge in Polymer Insulators by Artificial UV Radiation
Kim, Y.S. ; Choi, M.I. ; Kim, C.M. ; Bang, S.B. ; Shong, K.M. ; Kwag, D.S. ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 5, 2013, Pages 643~648
DOI : 10.5370/KIEE.2013.62.5.643
In this study, degradation was observed by irradiating UV rays to the polymer insulators which have been widely used in outdoor electric power facilities. For an indoor accelerated UV test, 0.55 w/m2 of UV rays were applied using a xenon-arc method. A UV detection system with 65
in diameter, 100 mm in length and 1.0 of brightness (F/#) has been designed. Even though efflorescence on the surface of polymer insulators wasn't observed according to the accelerated UV test. UV rays were detected at around 50% and 40% of insulation breakdown in EPDM and silicone-type insulators respectively. As degradation continued because of an indoor accelerated UV test, breakdown voltage with which UV rays can be detected in an early stage decreased as well. A silicone polymer insulator would be severer than EPDM polymer insulator in terms of surface degradation because of UV strength against
was high in silicone polymer insulators. UV strength in silicone-type insulators increased at 1,000
because contact angle at the intial stage sharply decreased to from
AC Insulation Breakdown Properties of the EMNC to Application of Distribution Molded Transformer
Park, Jae-Jun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 5, 2013, Pages 649~656
DOI : 10.5370/KIEE.2013.62.5.649
A conventional epoxy-microsilica composite (EMC) and an epoxy-microsilica-nanosilicate composite (EMNC) were prepared in order to apply them to mold-type transformers, current transformers (CT) and potential transformers (PT). Nanosilicate was exfoliated in a epoxy resin using our electric field dispersion process and AC insulation breakdown strength at
, glass transition temperature and viscoelasticity were studied. AC insulation breakdown strength of EMNC was higher than that of EMC and that value of EMNC was far higher at high temperature. Glass transition temperature and viscoelasticity property of EMNC was higher than those of EMC at high temperature. These results was due to the even dispersion of nanosilicates among the nanosilicas, which could be observed using transmission electron microscopy (TEM). That is, the nanosilicates interrupt the electron transfer and restrict the mobility of the epoxy chains.
Size-Reduction of Frequency Mixers Using Artificial Dielectric Substrate
Kwon, Kyunghoon ; Lim, Jongsik ; Jeong, Yongchae ; Ahn, Dal ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 5, 2013, Pages 657~662
DOI : 10.5370/KIEE.2013.62.5.657
A size-reduced high frequency mixer designed by adopting artificial dielectric substrate is described in this work. The artificial dielectric substrate is composed by stacking the lower substrate in which a lot of metalized via-holes exist, and upper substrate on which microstrip lines are realized. The effective dielectric constant increases due to the inserted lots of via-holes, and this may be applied to size-reduction of high frequency circuits. In this work, in order to present an application example of size-reduction for active high frequency circuits using the artificial dielectric substrate, a 8GHz single gate mixer is miniaturized and measured. It is described that the basic circuit elements for mixers such as hybrid, low pass filter, and matching networks can be replaced by the artificial dielectric substrate for size-reduction. The final mixer has 55% of size compared to the normal one. The measured average conversion gain is around 3dB which is almost similar result as the normal circuit.
RF Resonators Using Microstrip Transmission Line at 3 T MRI
Yoo, Hyoungsuk ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 5, 2013, Pages 663~666
DOI : 10.5370/KIEE.2013.62.5.663
This paper demonstrates four different radio frequency (RF) resonators at 3 T magnetic resonance imaging (MRI) system. An approach based on microstrip transmission line to identical RF resonators except upper stripline structure is investigated. Electromagnetic simulation results are compared for RF resonators and discussed in detail at 3 T.
Multi-Impedance Change Localization of the On-Voltage Power Cable Using Wavelet Transform Based Time-Frequency Domain Reflectometry
Lee, Sin Ho ; Choi, Yoon Ho ; Park, Jin Bae ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 5, 2013, Pages 667~672
DOI : 10.5370/KIEE.2013.62.5.667
In this paper, we propose a multi-impedance changes localization method of on-voltage underground power cable using the wavelet transform based time-frequency domain reflectometry (WTFDR). To localize the impedance change in on-voltage power cable, the TFDR is the most suitable among reflectometries because the inductive coupler is used to inject the reference signal to the live cable. At this time, the actual on-voltage power cable has multi-impedance changes such as the automatic section switches and the auto load transfer switches. However, when the multi-impedance changes are generated in the close range, the conventional TFDR has the cross term interference problem because of the nonlinear characteristics of the Wigner-Ville distribution. To solve the problem, the wavelet transform (WT) is used because it has the linearity. That is, using WTFDR, the cross term interference is not generated in multi-impedance changes due to the linearity of the WT. To confirm the effectiveness and accuracy of the proposed method, the actual experiments are carried out for the on-voltage underground power cable.
Stability of Interval Time-delayed Linear Systems using a Switched System Approach
Kim, Joo-Kyeong ; Kim, Jin-Hoon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 5, 2013, Pages 673~678
DOI : 10.5370/KIEE.2013.62.5.673
This paper considers the stability of linear systems having an interval time-varying delay using a switched system approach. The time-delay system is converted to the switched system equivalently, and then a stability criterion in the form of linear matrix inequality(LMI) is derived by using a parameter dependent Lyapunov-Krosovskii function(PD-LKF). In constructing a PD-LKF, the decomposition is employed for delay free intervals, and the reduction of conservatism is shown analytically as the number of decomposition increases. Finally, two well-known numerical examples are given to show the reduction of conservatism compared to the recent results.
Delay-dependent Robust H
Control of Uncertain Linear Systems with Time-varying Delays and Randomly Occurring Disturbances
Kim, Ki-Hoon ; Park, Myeong-Jin ; Kwon, Oh-Min ; Cha, Eun-Jong ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 5, 2013, Pages 679~687
DOI : 10.5370/KIEE.2013.62.5.679
This paper proposes a new condition about delay-dependent robust
control of uncertain linear systems with time-varying delay and randomly occurring disturbances. The norm bounded uncertainties are subjected to the system matrices. Based on Lyapunov stability theory, a sufficient condition for designing a controller gain such that the closed-loop systems are asymptotically stable with
is formulated in terms of linear matrix inequalities (LMIs). Finally, two numerical examples are included to show the effectiveness of the presented method.
Traffic Test Method for Networked Control System
Yu, Kwang-Myung ; Kim, Jong-An ; Ryu, Ho-Sun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 5, 2013, Pages 688~695
DOI : 10.5370/KIEE.2013.62.5.688
Networked Control Systems(NCS) contain the structure which controllers, actuators and sensors are connected to communication network. And they have been adopted in large and complicated plant area due to the advantages of mitigating computational bottleneck and maintenance. Although this structure provides many benefits, it brings in problems of unpredictable communication delay, data loss and corruption. This phenomena have to be considered in designing NCSs since it affects on overall control system stability. This paper introduces network traffic test method for ethernet based NCSs to find out maximum network usage which guarantee stable control operation. Test results shows this methods can be adopted in various types of NCSs and contributes economical system design and effective system operation.
Design of RBFNN-based Emotional Lighting System Using RGBW LED
Lim, Sung-Joon ; Oh, Sung-Kwun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 5, 2013, Pages 696~704
DOI : 10.5370/KIEE.2013.62.5.696
In this paper, we introduce the LED emotional lighting system realized with the aid of both intelligent algorithm and RGB LED combined with White LED. Generally, the illumination is known as a design factor to form the living place that affects human's emotion and action in the light- space as well as the purpose to light up the specific space. The LED emotional lighting system that can express emotional atmosphere as well as control the quantity of light is designed by using both RGB LED to form the emotional mood and W LED to get sufficient amount of light. RBFNNs is used as the intelligent algorithm and the network model designed with the aid of LED control parameters (viz. color coordinates (x and y) related to color temperature, and lux as inputs, RGBW current as output) plays an important role to build up the LED emotional lighting system for obtaining appropriate color space. Unlike conventional RBFNNs, Fuzzy C-Means(FCM) clustering method is used to obtain the fitness values of the receptive function, and the connection weights of the consequence part of networks are expressed by polynomial functions. Also, the parameters of RBFNN model are optimized by using PSO(Particle Swarm Optimization). The proposed LED emotional lighting can save the energy by using the LED light source and improve the ability to work as well as to learn by making an adequate mood under diverse surrounding conditions.
Optimized Multi-Output Fuzzy Neural Networks Based on Interval Type-2 Fuzzy Set for Pattern Recognition
Park, Keon-Jun ; Oh, Sung-Kwun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 5, 2013, Pages 705~711
DOI : 10.5370/KIEE.2013.62.5.705
In this paper, we introduce an design of multi-output fuzzy neural networks based on Interval Type-2 fuzzy set. The proposed Interval Type-2 fuzzy set-based fuzzy neural networks with multi-output (IT2FS-based FNNm) comprise the network structure generated by dividing the input space individually. The premise part of the fuzzy rules of the network reflects the individuality of the division space for the entire input space and the consequent part of the fuzzy rules expresses three types of polynomial functions with interval sets such as constant, linear, and modified quadratic inference for pattern recognition. The learning of fuzzy neural networks is realized by adjusting connections of the neurons in the consequent part of the fuzzy rules, and it follows a back-propagation algorithm. In addition, in order to optimize the network, the parameters of the network such as apexes of membership functions, uncertainty factor, learning rate and momentum coefficient were automatically optimized by using real-coded genetic algorithm. The proposed model is evaluated with the use of numerical experimentation.
A Study on the Influence to Solar Radiation by Changing the Azimuth and Tilt of a Photovoltaic Array
Choi, Young-Kwan ; Lee, Nam-Hyung ; Kim, Kern-Joong ; Cho, Yong ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 5, 2013, Pages 712~716
DOI : 10.5370/KIEE.2013.62.5.712
In solar generation, the PV array's azimuth is headed due south and the tilt is generally
in order to acquire maximum generation. However, when installed in a site where there are buildings or other facilities, the azimuth and tilt are adjusted. Yet, when the azimuth and tilt are deviated from due south and
, the generation quantity is decreased substantially and currently a method to estimate the decreasing proportion is unavailable. Therefore, in this thesis, an equation on the "change ratio of solar radiation due to the changes in tilt and azimuth" was deduced by utilizing empirical data on the amount of solar radiation received according to the changes of tilt and azimuth and Interpolation. By using this equation, the decreasing proportion of generating quantity due to the installation methods of PV system can be estimated, therefore, it can be usefully utilized when designing and going through feasibility studies for development of solar generation systems.
Implementation of C-HMI based Real-time Control and Monitoring for Remote Wastewater Reclamation and Reusing System
Lee, Un-Seon ; Park, Man-Gon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 5, 2013, Pages 717~722
DOI : 10.5370/KIEE.2013.62.5.717
The wastewater reclamation and reusing system has been rising as an alternative of water resource exhaustion that the whole world is experiencing. In order to be able to bring about improvement of the existing wastewater reclamation and reusing system, this research has developed of Conversion-Human Machine Interaction (C-HMI) based real-time control and monitoring system such as a sensor module and gate module, web monitoring system. This system was communication almost-error-free in various environment and situation. As a result, we have achieved our goal that has to doing work correctly as a sensor and gateway module that communication error is less than 0.2% throughout the embodied system and add that it can be easily controled and configured as an interface equipment to a complex sensor of water quality. According to this, the construction of a database capable of analyzing and assessing collection, storage and various elements of reliable water quality and flow rate data can be possible.
A Study on Transient Analysis of Linear Induction Motor with Ununiform Airgap for Shallow-depth Underground Train
Lee, Hyung-Woo ; Park, Chan-Bae ; Won, Sunghong ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 5, 2013, Pages 723~729
DOI : 10.5370/KIEE.2013.62.5.723
This paper presents an parallel type Linear Induction Motor with ununiform airgap for a shallow-depth underground train with 100‰ grade and 15 m curvature. This parallel type LIM has enough gradability but has inherently ununiform airgap between center and end parts. Consequently, performance when the train passes curved section should be considered with transient analysis. Moreover, general parallel operation, 1C2M which is usually used for train operation, deteriorates LIM performance because of different line velocity between inner and outer LIMs. Transient analysis has many problems such as huge model, lots of meshes, very long calculation time, truncation error and so on. This paper has presented a novel technique using equivalent linear rotating model in order to solve these problems and has analyzed parallel type LIM by using the proposed technique. Finally, LIM performance according to independent operating control has been investigated.