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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 61, Issue 12 - Dec 2012
Volume 61, Issue 11 - Nov 2012
Volume 61, Issue 10 - Oct 2012
Volume 61, Issue 9 - Sep 2012
Volume 61, Issue 8 - Aug 2012
Volume 61, Issue 7 - Jul 2012
Volume 61, Issue 6 - Jun 2012
Volume 61, Issue 5 - May 2012
Volume 61, Issue 4 - Apr 2012
Volume 61, Issue 3 - Mar 2012
Volume 61, Issue 2 - Feb 2012
Volume 61, Issue 1 - Jan 2012
Selecting the target year
A Large Scale Smart-Grid field-test in Jeju
NamKoong, Won ; Ha, Bok-Nam ; Lee, Sung-Woo ; Seo, In-Yong ; Jang, Moon-Jong ;
The Transactions of The Korean Institute of Electrical Engineers, volume 61, issue 1, 2012, Pages 1~6
DOI : 10.5370/KIEE.2012.61.1.001
Five smart grid projects was started with large scale at Jeju Island in South Korea from 2009, and smart-grid test-bed was started in Nov. 2010. The five projects are Smart Power Grid (SPG), Smart Renewable (SR), Smart Transportation (ST), Smart Place (SP) and Smart Electric Service (SES). Korea government constructed the smart grid public relations center at Nov. 2010 in Jeju Island and there will be continued the field operation and interface testing among five smart gird projects until May. 2013.
Determination of Optimal Operating Angle for HVDC System
Kim, Jin-Young ; Kim, Jae-Han ; Kim, Chan-Ki ;
The Transactions of The Korean Institute of Electrical Engineers, volume 61, issue 1, 2012, Pages 7~15
DOI : 10.5370/KIEE.2012.61.1.007
In this paper a process of determination for thyristors operating with optimal angle is described. The proposed method is based on the trade-off between the cost(due to rating and loss) and controllability of the system. Large control angle increases controllability of HVDC system and also increase the rating of the system which leads to a high price. Therefore it is important to determine a control angle at a first step of design procedure. This paper shows a rating trend of C.Tr, Valve and Filter due to control angle variation, and then introduces a determination process of the HVDC operating angle.
The Economic Evaluation of Renewable Energy Penetration Based on Grid Parity According to the Ratio of DC Power Supply
Kim, Sung-Yul ; Lee, Sung-Hun ; Kim, Jin-O ;
The Transactions of The Korean Institute of Electrical Engineers, volume 61, issue 1, 2012, Pages 16~21
DOI : 10.5370/KIEE.2012.61.1.016
The growth in IT industry has brought a corresponding rise in the number of connected digital devices in the distribution network. These digital loads lead to AC to DC conversion losses in order to supply power to them. The more the renewable energies and plug-in electrical vehicles penetrated our lives, the more the electrical losses are caused by AC to DC conversion process. Hence, this paper suggests the methodology for evaluating the amount of power supplied according to the ratio of DC power supply and performs an economic analysis of DC distribution system considering grid parity. In here, the cost of carbon emission reduced by renewable energy is also concerned.
Islanding Detection for a Micro-Grid based on the Instantaneous Active and Reactive Powers in the Time Domain
Lee, Young-Gui ; Kim, Yeon-Hee ; Zheng, Tai-Ying ; Kim, Tae-Hyun ; Kang, Yong-Cheol ;
The Transactions of The Korean Institute of Electrical Engineers, volume 61, issue 1, 2012, Pages 22~27
DOI : 10.5370/KIEE.2012.61.1.022
Correct and fast detection of a micro-grid (MG) islanding is essential to the MG since operation, control and protection of the MG depend on an operating mode i.e., an interconnected mode or an islanding mode. When islanding occurs, the frequency of the point of common coupling (PCC) is not the nominal frequency during the transient state owing to the frequency rise or drop of generators in the MG. Thus, the active and reactive power calculated by the frequency domain based method such as Fourier Transform might contain some errors. This paper proposes an islanding detection algorithm for the MG based on the instantaneous active and reactive powers delivered to the dedicated line in the time domain. During the islanding mode, the instantaneous active and reactive powers delivered to the dedicated line are constants, which depend on the voltage of the PCC and the impedance of the dedicated line. In this paper, the instantaneous active and reactive powers are calculated in the time domain and used to detect islanding. The performance of the proposed algorithm is verified under various scenarios including islanding conditions, fault conditions and load variation using the PSCAD/EMTDC simulator. The results indicate that the algorithm successfully detects islanding for the MG.
Designs of the Unified Information Model-IEC61850/IEC61970 and Topology Model for Smart Grid
Yun, Seok-Yeul ; Yim, Hwa-Young ;
The Transactions of The Korean Institute of Electrical Engineers, volume 61, issue 1, 2012, Pages 28~33
DOI : 10.5370/KIEE.2012.61.1.028
The smart grid, which is an integrated type of the power system and the digital network, requires the integration of a CIM(Common Information Model) standard for information modelling at the power control centers and an IEC 61850 standard for automation at the substation level in order to efficiently exchange the information between system elements. This paper describes the method of data transfer from one standard information model to the other standard unified information model by mapping between the objects of IEC 61850 and IEC61970 CIM standards both in the static and dynamic models, and designs the method of data transfer and information exchange between the topology processing application using unified topology class packages.
Analytical Estimation of Inductance at Aligned and Unaligned Rotor Positions in a Switched Reluctance Motor
Lee, Chee-Woo ;
The Transactions of The Korean Institute of Electrical Engineers, volume 61, issue 1, 2012, Pages 34~40
DOI : 10.5370/KIEE.2012.61.1.034
Flux linkage of phase windings or phase inductance is an important parameter in determining the behavior of a switched reluctance motor (SRM) [1-8]. Therefore, the accurate prediction of inductance at aligned and unaligned rotor positions makes a significant contribution to the design of an SRM and its analytical approach is not straightforward due to nonlinear flux distribution. Although several different approaches using a finite element analysis (FEA) or curve-fitting tool have been employed to compute phase inductance [2-5], they are not suitable for a simple design procedure because the FEA necessitates a large amount of time in both modeling and solving with complexity for every motor design, and the curve-fitting requires the data of flux linkage from either an experimental test or an FEA simulation. In this paper, phase inductance at aligned and unaligned rotor positions is estimated by means of numerical method and magnetic equivalent circuit as well, and the proposed approach is analytically verified in terms of the accuracy of estimated inductance compared to inductance computed by an FEA simulation.
Operation Mode Development and Evaluation for Grid-Tied PMSG Wind Power System Combined with Battery Energy Storage
Kim, Hyun-Jun ; Kim, Do-Hyun ; Kim, Kyung-Tae ; Han, Byung-Moon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 61, issue 1, 2012, Pages 41~49
DOI : 10.5370/KIEE.2012.61.1.041
This paper describes the operation mode development for the grid-tied PMSG(permanent magnet synchronous generator) wind power system combined with a battery energy storage. The development of operation modes was carried out through simulations with PSCAD/EMTDC software and experiments with a 10kW hardware prototype. The detailed simulation models for PMSG wind power system and battery energy storage were developed using user-defined models programed with C-code. A 10kW hardware simulator was built and tested in connection with the local load and the utility power. The simulation and experimental results confirm that the grid-tied PMSG wind power system combined with battery energy storage can supply highly reliable power to the local load in various operation modes.
Improve of Efficiency of Multi D.O.F Spherical Motor Through the Reduction of Eddy Current Loss
Hong, Kyung-Pyo ; Kim, Yong ; Jang, Ik-Sang ; Lee, Ho-Joon ; Kang, Dong-Woo ; Won, Sung-Hong ; Lee, Ju ;
The Transactions of The Korean Institute of Electrical Engineers, volume 61, issue 1, 2012, Pages 50~56
DOI : 10.5370/KIEE.2012.61.1.050
The Multi D.O.F spherical motor can drive rotating as well as tilting three degree of freedom with one motor. Existing three degree of freedom to drive with three motors that are connected by gears and belts, that will be too large size and big loss at gears and belts. So Reducing system size and improving efficient is using the Multi D.O.F spherical motor in three degree of freedom systems. For this reason, efficiency of Multi D.O.F spherical motor is one of the important performance indiccators. In this paper presented that how to improve the efficiency of the Multi D.O.F spherical motor. The fist of method is using the stator iron core`s material with high permeability and resistivity for reducing the eddy current loss. However, it was the disadvatages of motor-making and economic. So author propose the resonable method of reducing the eddy current loss in the stator iron core. That is using the rotor with double-air gap.
Analysis Torque Characteristics and Improved Efficiency of Permanent Magnet Multi-D.O.F. Spherical Motor
Lee, Ho-Joon ; Kim, Yong ; Jang, Ik-Sang ; Park, Hyun-Jong ; Kang, Dong-Woo ; Won, Sung-Hong ; Lee, Ju ;
The Transactions of The Korean Institute of Electrical Engineers, volume 61, issue 1, 2012, Pages 57~63
DOI : 10.5370/KIEE.2012.61.1.057
A surfaced permanent magnet spherical motor is capable of operating as three degree of freedom that used for the joints of the robot`s arm, leg, and eyes. Ongoing research like new concept is essential part of motor field, it will make a great contribution in the future the overall portion of the motor, is becoming expected. The author analysis torque characteristics in spherical motor with state of rotating and positioning. And future design direction is smaller motors with equivalent or higher output. Solutions as torque and efficiency improvements are selecting the core with special processing type like powder metallurgy materials. Their special characteristic is high permeability and low eddy current losses at high speed, so improved the torque and efficiency.
The Optimization of Rotor Shape for Constant Torque Improvement and Radial Magnetic Force Minimization
Cho, Gyu-Won ; Ji, Seung-Hun ; Park, Kyoung-Won ; Jang, Ki-Bong ; Kim, Gyu-Tak ;
The Transactions of The Korean Institute of Electrical Engineers, volume 61, issue 1, 2012, Pages 64~69
DOI : 10.5370/KIEE.2012.61.1.064
In this paper, the optimal design of notch and barrier was carried out in order to improve characteristics of constant torque with minimizing the cogging torque occurred by teeth and slot structure. Optimized design was carried out by design of experiment and various characteristics including torque were studied by finite element method(FEM). In addition, in order to verify resonance frequency, natural frequency of the stator was analyzed by modal analysis.
The Study of Efficiency and Characteristics Comparison between Aluminum and Copper Die Casting Induction Motor for Improving Efficiency
Han, Pil-Wan ; Lee, Ju ;
The Transactions of The Korean Institute of Electrical Engineers, volume 61, issue 1, 2012, Pages 70~74
DOI : 10.5370/KIEE.2012.61.1.070
Copper die casting motor (CDM) has a better design flexibility than aluminium die casting motor (ADM) because of the higher conductivity of copper. However, CDM has an economic and manufacturing weak point due to high copper price and high melting temperature compared to ADM. This paper describes a comparison of the design parameters, specifications, performances and material cost between CDM and ADM of 5.5kW_6P.
Comparison of MPPT Control Method Characteristic for Stand-alone PV System
Lee, Yong-Sik ; Kim, Nam-In ; Jeong, Sung-Won ; Gim, Jae-Hyeon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 61, issue 1, 2012, Pages 75~79
DOI : 10.5370/KIEE.2012.61.1.075
Maximum power point tracking(MPPT) techniques are used in photovoltaic systems to maximize the PV array output power by tracking continuously the maximum power point which depends on panels temperature and on irradiance conditions. This paper proposes a variable step size MPPT algorithm which can improve the MPPT speed and accuracy. Depending on insolation and temperature, the MPPT controller gives optimized step size. The effectiveness of the proposed system is verified thorough PSIM simulation and experiments on a 50[W] prototype. The experimental results confirm that the PV power of the improved P&O method is higher than that of the traditional P&O method.
FPGA based POS MPPT Control for a Small Scale Charging System of PV-nickel Metal Hydride Battery
Lee, Hyo-Guen ; Seo, Hyo-Ryong ; Kim, Gyeong-Hun ; Park, Min-Won ; Yu, In-Keun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 61, issue 1, 2012, Pages 80~84
DOI : 10.5370/KIEE.2012.61.1.080
Recently, the small scale photovoltaic (PV) electronic devices are drawing attention as the upcoming PV generation system. The PV system is commonly used in small scale PV applications such as LED lighting and cell phone. This paper proposes photovoltaic output sensorless (POS) maximum power point tracking (MPPT) control for a small scale charging system of PV-nickel metal hydride battery using field-programmable gate array (FPGA) controller. A converter is connected to a small scale PV cell and battery, and performs the POS MPPT at the battery terminal current instead of being at the PV cell output voltage and current. The FPGA controller and converter operate based on POS MPPT method. The experimental results show that the nickel metal hydride battery is charged by the maximum PV output power.
Analyses of the Output Characteristics and the Internal Impedance of Dye-sensitized Solar Cell According to the Fabrication of the Blocking Layer
Kim, Jin-Kyoung ; Son, Min-Kyu ; Kim, Soo-Kyoung ; Hong, Na-Yeong ; Kim, Byung-Man ; Prabarkar, Prabarkar ; Kim, Hee-Je ;
The Transactions of The Korean Institute of Electrical Engineers, volume 61, issue 1, 2012, Pages 85~88
DOI : 10.5370/KIEE.2012.61.1.085
DSCs are based on a dye-adsorbed porous
layer as a photo electrode . Under the illumination, dye molecules are excited and electrons are produced. The injected electrons in the conduction band of
may recombine with the electrolyte. To obtain high performance DSCs, it is essential to retard the recombination. The charge recombination can be reduced by forming core-shell structure. In this work, we investigated the core-shell structure with
and MgO coating layer on the porous
layer. We confirmed the photovoltaic properties by I-V characteristics. The current and the efficiency was improved. In addition to, Through decrease in the width of EIS arc, which is the sum of the interfacial charge transfer resistances of both electrodes, we can be indicated that the block effect.
Characteristics on Boundary Layer and Formation Mechanism of c-BN Thin Films During Electron Assisted Hot Filament CVD Process
Choi, Yong ; Choe, Jean-I. ;
The Transactions of The Korean Institute of Electrical Engineers, volume 61, issue 1, 2012, Pages 89~93
DOI : 10.5370/KIEE.2012.61.1.089
c-BN films were deposited on SKH-51 steels by electron assisted hot filament CVD method and microstructure development was studied processing parameters such as bias voltage, temperature, etching and phase transformation at boundary layer between BN compound and steel to develop a high performance wear resistance tools. A negative bias voltage higher than 200V at substrate temperature of
and gas pressure of 20 torr in B2H6-NH3-H2 gas system was one of optimum conditions to produce c-BN films on the SKH-51 steels. Thin layer of hexagonal boron nitride phase was observed at the interface between c-BN layer and substrate.
A Study on Ozone Micro Bubble Effects for Solar Cell Wafer Cleaning
Yoon, Jong-Kuk ; Koo, Kyung-Wan ;
The Transactions of The Korean Institute of Electrical Engineers, volume 61, issue 1, 2012, Pages 94~98
DOI : 10.5370/KIEE.2012.61.1.094
The behavior of ozone micro bubble cleaning system was investigated to evaluate the solution as a new method of solar cell wafer cleaning in comparison with former conventional RCA cleaning. We have developed the ozone dissolution system in the ozonated water for more efficient cleaning conditions. The optimized cleaning conditions for solar cell wafer process were 10 ppm of ozone concentration and 12 minutes in cleaning periods, respectively. We have confirmed the cleaning reliability and cell efficiencies after ozone micro bubble cleaning. Using this new cleaning technology, it was possible to obtain higher efficiency, higher productivity, and fast tact time for applying cleaning in the fields on bare ingot wafer, LED wafers as well as the solar cell wafer.
Analysis of Coupling Effects in Transmission Lines Using the BLT Equation and Numerical Methods
Du, Jin-Kyoung ; Ahn, Jae-Woon ; Hwang, Sun-Mook ; Yook, Jong-Gwan ;
The Transactions of The Korean Institute of Electrical Engineers, volume 61, issue 1, 2012, Pages 99~103
DOI : 10.5370/KIEE.2012.61.1.099
The electromagnetic topology and the BLT equation has been used as useful techniques to analyze coupling effects of huge devices. But in the case of systems including complex parts, applying the BLT equation can be difficult to manifest the complex parts with analytic solutions. To resolve this problem, a numerical method can be used to parts of the whole system in advance. In this paper, a microstrip line filter is analyzed using the BLT equation combined with numerical solutions. Consequently, achieved graphs from the BLT equation show good agreements with graphs obtained using a numerical method only.
Design of a Compact Bandstop Filter-combined UHF-band CRLH Bandpass Filter to Suppress the Spurious in L-band
Eom, Da-Jeong ; Kahng, Sung-Tek ; Mok, Se-Gyoon ; Song, Choong-Ho ; Woo, Chun-Sik ; Park, Do-Hyun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 61, issue 1, 2012, Pages 104~109
DOI : 10.5370/KIEE.2012.61.1.104
In this paper, we propose a way to improve the quality of L-band wireless communication from unfriendly influential factors lying in the neighboring RF bands. The UHF-band system has resonator components and they generate harmonics as the spurious in the L-band. Therefore, a metamaterial CRLH bandpass filter is designed for the purpose of system miniaturization and smaller insertion loss, and its spurious phenomenon is observed in the frequency domain. And its harmonics in the L-band are suppressed by a compact bandstop filter whose equivalent circuit is newly developed. The design methodology is validated by the equivalent circuit to be compared with commercial full-wave EM software simulations, where the spurious is dropped by 20dB. Also, the advantage of the proposed design is presented by the comparison where our filter is much smaller than the conventional parallel edge coupled filter by over 50%, with excellent harmonic suppression.
Design of the Open-Loop Combined Meandered-Line 1-Layer Radiator for Diversity Antennas with Size-Reduction and Improved Isolation
Mok, Se-Gyoon ; Kahng, Sung-Tek ; Kim, Yong-Jin ;
The Transactions of The Korean Institute of Electrical Engineers, volume 61, issue 1, 2012, Pages 110~116
DOI : 10.5370/KIEE.2012.61.1.110
This paper proposes a new diversity antenna which is the base of MIMO, tunable and reconfigurable antennas. The antenna has a small size and high inter-antenna isolation resulting from the compact radiating element comprising a meandered line and an open-loop combined in one limited uniplanar space and a modified T-shaped decoupling structure, respectively. In a WiMAX band, the radiating element and the entire antenna are
in size, which shows effective size-reduction and the gain and efficiency of the proposed antenna attached to the ground of a handheld device are 3.7dBi and 56% acceptable to the industrial standard.
Some Remarks on the s-plane to w-plane Correlations of w-transform
Jin, Lihua ; Kim, Young-Chol ;
The Transactions of The Korean Institute of Electrical Engineers, volume 61, issue 1, 2012, Pages 117~124
DOI : 10.5370/KIEE.2012.61.1.117
In this paper, we present some remarks on the correlations between s and w domains when a discrete-time transfer function is converted from z-plane by using the w-transform. With time response specifications, when a digital filter or controller is designed in z-plane, the w-transform is useful for the purpose if only the w-transformed system closely approximates to the continuous-time system. It will be shown that the approximation is accomplished only in the specific region depending on sampling time. Also, it is noted that such an approximation should be carefully dealt with for the case where a discrete-time reference transfer function is synthesized for the use of direct digital design.
Object Surveillance and Unusual-behavior Judgment using Network Camera
Kim, Jin-Kyu ; Joo, Young-Hoon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 61, issue 1, 2012, Pages 125~129
DOI : 10.5370/KIEE.2012.61.1.125
In this paper, we propose an intelligent method to surveil moving objects and to judge an unusual-behavior by using network cameras. To surveil moving objects, the Scale Invariant Feature Transform (SIFT) algorithm is used to characterize the feature information of objects. To judge unusual-behaviors, the virtual human skeleton is used to extract the feature points of a human in input images. In this procedure, the Principal Component Analysis (PCA) improves the accuracy of the feature vector and the fuzzy classifier provides the judgement principle of unusual-behaviors. Finally, the experiment results show the effectiveness and the feasibility of the proposed method.
The Cooperate Navigation for Swarm Robot Using Centroidal Voronoi Tessellation
Bang, Mun-Seop ; Joo, Young-Hoon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 61, issue 1, 2012, Pages 130~134
DOI : 10.5370/KIEE.2012.61.1.130
In this paper, we propose a space partitioning technique for swarm robots by using the Centroidal Voronoi Tessellation. The proposed method consists of two parts such as space partition and collision avoidance. The space partition for searching a given space is carried out by a density function which is generated by some accidents. The collision avoidance is implemented by the potential field method. Finally, the numerical experiments show the effectiveness and feasibility of the proposed method.
Structural Design of Radial Basis Function-based Polynomial Neural Networks by Using Multiobjective Particle Swarm Optimization
Kim, Wook-Dong ; Oh, Sung-Kwun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 61, issue 1, 2012, Pages 135~142
DOI : 10.5370/KIEE.2012.61.1.135
In this paper, we proposed a new architecture called radial basis function-based polynomial neural networks classifier that consists of heterogeneous neural networks such as radial basis function neural networks and polynomial neural networks. The underlying architecture of the proposed model equals to polynomial neural networks(PNNs) while polynomial neurons in PNNs are composed of Fuzzy-c means-based radial basis function neural networks(FCM-based RBFNNs) instead of the conventional polynomial function. We consider PNNs to find the optimal local models and use RBFNNs to cover the high dimensionality problems. Also, in the hidden layer of RBFNNs, FCM algorithm is used to produce some clusters based on the similarity of given dataset. The proposed model depends on some parameters such as the number of input variables in PNNs, the number of clusters and fuzzification coefficient in FCM and polynomial type in RBFNNs. A multiobjective particle swarm optimization using crowding distance (MoPSO-CD) is exploited in order to carry out both structural and parametric optimization of the proposed networks. MoPSO is introduced for not only the performance of model but also complexity and interpretability. The usefulness of the proposed model as a classifier is evaluated with the aid of some benchmark datasets such as iris and liver.
Improvement in Viola-Jones method for Real-Time Face Recognition System
Hong, Young-Min ; Lee, In-Sung ; Park, Jong-Sun ; Jo, Yong-Sung ; Kim, Chang-Beom ;
The Transactions of The Korean Institute of Electrical Engineers, volume 61, issue 1, 2012, Pages 143~147
DOI : 10.5370/KIEE.2012.61.1.143
The rapid growth of camera technology can provide various types of information which was not previously provided. Furthermore, IP camera which has rapid data transfer rate and high resolution particularly provide a lot of useful functions beyond the existing simple surveillance capabilities. We are developing Real-Time Face Recognition Access Control System based on the camera technology, and improvement of face detection and recognition algorithms are vitally needed to realize that system. In this paper, we proposes a method to improve the computing speed and detection rate by adding new features to the existing Viola-Jones detection algorithm.
Optimal Checkpoint Placement for Real-Time Systems with Multi-Tasks Having Deadlines Longer Than Periods
Kwak, Seong-Woo ; Yang, Jung-Min ;
The Transactions of The Korean Institute of Electrical Engineers, volume 61, issue 1, 2012, Pages 148~154
DOI : 10.5370/KIEE.2012.61.1.148
For a successful checkpointing strategy, we should place checkpoints so as to optimize fault-tolerance capability of real-time systems. This paper presents a novel scheme of checkpoint placement for real-time systems with periodic multi-tasks. Under the influence of transient faults, multi-tasks are scheduled by the Rate Monotonic (RM) algorithm. The optimal checkpoint intervals are derived to maximize the probability of task completion. In particular, this paper is concerned about the general case that the deadline of a task is longer than the period. Compared with the special condition that the deadline is equal to or less than the period, this general case causes a more complicate test procedure for schedulability of the RM algorithm with respect to a given set of checkpoint re-execution vectors. The probability of task completion is also derived in a more complex form. A case study is given to show the applicability of the proposed scheme.
A Study on the Requirements Analysis and Design for System Development of Remote Firmware Upgrade Management System Based-on AMI
Jung, Nam-Joon ; Yang, Il-Kwon ; Choi, Seong-Hwan ; Jin, Young-Taek ;
The Transactions of The Korean Institute of Electrical Engineers, volume 61, issue 1, 2012, Pages 155~161
DOI : 10.5370/KIEE.2012.61.1.155
The firmware upgrade, which is remotely performed, is an essential function in smart metering or AMI (Advanced Metering Infrastructure). In other words, the AMI software and firmware can be switched for maintaining and improvement without replacement of H/W devices in AMI environment. Also, if number and type of devices are increase, the demand of remote update service will be increased. Through the firmware upgrade service remotely, the electric power corporation may be able to benefit various fields. For example, there are to adapt more easily in many environments, real-time service and to cut maintenance costs. In this paper, we proposed to design an international level FUMS(Firmware Upgrade Management System) which includes requirement function, architecture and protocol related with DCU, Smart Meter.
Power Quality Disturbances Detection Technique using Filter Bank and Adaptive Filters
Yun, Jae-Jun ; Lee, Jeong-Kyu ; Sohn, Sang-Wook ; Bae, Hyeon-Deok ;
The Transactions of The Korean Institute of Electrical Engineers, volume 61, issue 1, 2012, Pages 162~167
DOI : 10.5370/KIEE.2012.61.1.162
In power quality monitoring, it is very important to detect disturbances (sag, swell, transient, and interruption) accurately. In this paper, a detection method for power quality disturbances by combining the filter bank system and adaptive filter is proposed. To decompose power signal, binary tree structured filter bank system is designed. In the filter bank system, the fundamental filter bank(QMF bank) is used as a module in each decomposing level. An adaptive filter is used to improve the detection accuracy of disturbances for each subband signal. In the adaptive filter, the measure of estimated error change is used to detect singular points of power quality disturbances. Computer simulations were performed on synthetic signals which have disturbances to assess the performance of the proposed method.
A Study on the Cascading Chebyshev Filter for Ripple Cancellation
Kang, Doo-Byung ; Shin, Seung-Sik ;
The Transactions of The Korean Institute of Electrical Engineers, volume 61, issue 1, 2012, Pages 168~172
DOI : 10.5370/KIEE.2012.61.1.168
This paper is focusing on the comparison of different kinds of BPFs(Band Pass Filters) passing signals with a particular frequency band. According to the different classifications, features and target application systems, BPF has many types. Chebyshev filter which has a steep slope and a few ripples, and Butterworth filter which has no ripple but gentle slope are the most typical BPFs. The ideal filter is flat in the passband and the slope in the transition band is perpendicular. In this paper, we suggest the cascading Chebyshev BPF with the advantages of the Chebyshev filter and the Butterworth filter simultaneously to make a closest filter to an ideal filter. The proposing BPF is the tenth Chebyshev BPF cascading the fourth and the sixth, and it is designed as the tenth cascading Chebyshev BPF. To measure the performance of the designing filter, we have compared and analyzed the tenth Chebyshev filter with the tenth Butterworth filter. As a result, the tenth cascading Chebyshev BPF has decreased the ripple more than 1/4 [dB] in the passband. Finally, the output of the simulation showed the validity of the proposing cascading Chebyshev filter.
A Study on the Simplification for Quantity Bill Writing and Structure in the Electrical Extension Field
Hyun, So-Young ; Kim, Gwang-Gon ; Park, Min-Young ; Choi, Seung-Dong ;
The Transactions of The Korean Institute of Electrical Engineers, volume 61, issue 1, 2012, Pages 173~178
DOI : 10.5370/KIEE.2012.61.1.173
The quantity bill writing of organized electrical construction can be an effective to quality and process management in the construction. Therefore, in order to overcome confusion of the construction and doing an effective work, the clearly quantity bill writing is need. This paper is a focused to solve a problem of existing quantity bill as the difference in terms of work section and item information, regulatory information of ordering authority. Therefore, a terms of work section and item information, regulatory information of ordering authority has been normalized. Moreover, basic data of simplification for quantity bill writing and structure has been guaranteed.
KTX Interior Noise Reduction Performance Comparison Using Multichannel Active Noise Control for Each Section
Jang, Hyeon-Seok ; Kim, Young-Ming ; Lee, Tae-Oh ; Lee, Kwon-Soon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 61, issue 1, 2012, Pages 179~185
DOI : 10.5370/KIEE.2012.61.1.179
Since the eco-era is getting closer, the importance of noise reducing in the passenger cars of high-speed train is very important. The active noise control is best choice to reduce low frequency noise because the passive one is too heavy for high speed trains where weight is so critical. Also ANC is able to reduce the ambient noise when the environmental-factor changes. To reduce a three-dimensional closed-space sound field like a car of a high-speed rail is hard to do using single channel ANC control system. We used multi-channel FXLMS algorithm which calculation speed is fast and the secondary path estimation is possible in order to take into account the physical delay in electro acoustic hardware control loudspeaker and power amplifier. Firstly, we have measured interior noise of KTX and estimated noise path in KTX test-bed. However there was some problem related to algorithm divergence and increasing the filter order. We have made a simulation of interior environment of KTX car by using three frequency bands of 120Hz, 280Hz, 360Hz as the most important for KTX ANC system. During this research the interior noise reduction of KTX car was made by using the multi-channel FXLMS algorithm. Reduction performance was evaluated and compared each other for open space section and tunnel section. in-situ experiment for the KTX noise reduction by proposed ANC was performed based on data obtained in simulation and they were compared for open space section and tunnel section as well.