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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Electrical Engineering and Technology
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Journal DOI :
The Korean Institute of Electrical Engineers
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Volume & Issues
Volume 1, Issue 4 - Dec 2006
Volume 1, Issue 3 - Sep 2006
Volume 1, Issue 2 - Jun 2006
Volume 1, Issue 1 - Mar 2006
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Deve lopment of Simulator System for Microgrids with Renewable Energy Sources
Jeon, Jin-Hong ; Kim, Seul-Ki ; Cho, Chang-Hee ; Ahn, Jong-Bo ; Kim, Eung-Sang ;
Journal of Electrical Engineering and Technology, volume 1, issue 4, 2006, Pages 409~413
DOI : 10.5370/JEET.2006.1.4.409
This paper deals with the design and testing of a simulator system for microgrids with distributed generations. This system is composed of a Real Time Digital Simulator (RTDS) and a power amplifier. The RTDS parts are operated for real time simulation for the microgrid model and the distributed generation source model. The power amplifiers are operated fur amplification of the RTDS's simulated output signal, which is a node voltage of the microgrid and distributed generation source. In this paper, we represent an RTDS system design, specification and test results of a power amplifier and simulation results of a PV (Photovoltaic) system and wind turbine system. The proposed system is applicable for development and performance testing of a PCS (Power Conversion System) for renewable energy sources.
A Combined Bulk Electric System Reliability Framework Using Adequacy and Static Security Indices
Billinton, Roy ; Wangdee, Wijarn ;
Journal of Electrical Engineering and Technology, volume 1, issue 4, 2006, Pages 414~422
DOI : 10.5370/JEET.2006.1.4.414
Deterministic techniques have been applied in power system planning for many years and there is a growing interest in combining these techniques with probabilistic considerations to assess the increased system stress due to the restructured electricity environment. The overall reliability framework proposed in this paper incorporates the deterministic N-1 criterion in a probabilistic framework, and results in the joint inclusion of both adequacy and security considerations in system planning. The combined framework is achieved using system well-being analysis and traditional adequacy assessment. System well-being analysis is used to quantify the degree of N-1 security and N-1 insecurity in terms of probabilities and frequencies. Traditional adequacy assessment is Incorporated to quantify the magnitude of the severity and consequences associated with system failure. The concepts are illustrated by application to two test systems. The results based on the overall reliability analysis framework indicate that adequacy indices are adversely affected by a generation deficient environment and security indices are adversely affected by a transmission deficient environment. The combined adequacy and security framework presented in this paper can assist system planners to realize the overall benefits associated with system modifications based on the degree of adequacy and security, and therefore facilitate the decision making process.
Loop Selective Direction Measurement for Distance Protection
Steynberg, Gustav ; Koch, Geyhard ;
Journal of Electrical Engineering and Technology, volume 1, issue 4, 2006, Pages 423~426
DOI : 10.5370/JEET.2006.1.4.423
Distance relays achieve selective tripping by measurement of all short circuit fault conditions inside set reaches. The direction of the fault, forward or reverse is commonly determined with a dedicated measurement to ensure selectivity under all conditions. For the direction decision (measurement) a number of alternatives are available. This paper describes a loop selective direction measurement and illustrates by means of a typical fault why this is superior to a non loop selective direction measurement such as that based on negative sequence quantities.
The Adequacy Analysis for Installation of High Speed Grounding Switches on the Korean 765kV Single Transmission Line
Ahn, Sang-Pil ; Kim, Chul-Hwan ; Park, Nam-Ok ; Ju, Hyung-Jun ; Shim, Eung-Bo ;
Journal of Electrical Engineering and Technology, volume 1, issue 4, 2006, Pages 427~434
DOI : 10.5370/JEET.2006.1.4.427
This paper analyzes arc phenomena including the secondary arc's elongation in the Korean 765kV single transmission line (79km) between Sin-Ansung S/S and Sin-Gapyeong S/S, which will be installed in Korea in June 2006. In particular, both frequency independent and frequency dependent line models are compared to make our final decisions. As well, the significant simulation results are investigated by the EMTP program. As a result, there is no need of HSGS in the Korean 765kV single transmission line from both a practical and an economical point of view.
PC Cluster based Parallel Adaptive Evolutionary Algorithm for Service Restoration of Distribution Systems
Mun, Kyeong-Jun ; Lee, Hwa-Seok ; Park, June-Ho ; Kim, Hyung-Su ; Hwang, Gi-Hyun ;
Journal of Electrical Engineering and Technology, volume 1, issue 4, 2006, Pages 435~447
DOI : 10.5370/JEET.2006.1.4.435
This paper presents an application of the parallel Adaptive Evolutionary Algorithm (AEA) to search an optimal solution of the service restoration in electric power distribution systems, which is a discrete optimization problem. The main objective of service restoration is, when a fault or overload occurs, to restore as much load as possible by transferring the de-energized load in the out of service area via network reconfiguration to the appropriate adjacent feeders at minimum operational cost without violating operating constraints. This problem has many constraints and it is very difficult to find the optimal solution because of its numerous local minima. In this investigation, a parallel AEA was developed for the service restoration of the distribution systems. In parallel AEA, a genetic algorithm (GA) and an evolution strategy (ES) in an adaptive manner are used in order to combine the merits of two different evolutionary algorithms: the global search capability of the GA and the local search capability of the ES. In the reproduction procedure, proportions of the population by GA and ES are adaptively modulated according to the fitness. After AEA operations, the best solutions of AEA processors are transferred to the neighboring processors. For parallel computing, a PC cluster system consisting of 8 PCs was developed. Each PC employs the 2 GHz Pentium IV CPU and is connected with others through switch based fast Ethernet. To show the validity of the proposed method, the developed algorithm has been tested with a practical distribution system in Korea. From the simulation results, the proposed method found the optimal service restoration strategy. The obtained results were the same as that of the explicit exhaustive search method. Also, it is found that the proposed algorithm is efficient and robust for service restoration of distribution systems in terms of solution quality, speedup, efficiency, and computation time.
Assessment of Interruption Costs by Industrial Customer Type
Choi, Sang-Bong ;
Journal of Electrical Engineering and Technology, volume 1, issue 4, 2006, Pages 448~454
DOI : 10.5370/JEET.2006.1.4.448
As the power industry moves towards open competition, a need has arisen for appropriate methodology to evaluate power system reliability by using customer Interruption costs. This paper presents an assessment of the interruption costs by industrial customer type in Korea using customer survey methodology. When various research results are examined, the customer damage survey methodology becomes much more generalized. Especially, in the case of industrial customers, it is known that evaluation by the customer damage survey is more useful. Accordingly, this paper selected the customer damage survey method to evaluate the interruption costs by industrial customer type in Korea considering interruption and customer characteristics.
A Study on the Convergency Property of the Auxiliary Problem Principle
Kim, Balho-H. ;
Journal of Electrical Engineering and Technology, volume 1, issue 4, 2006, Pages 455~460
DOI : 10.5370/JEET.2006.1.4.455
This paper presents the convergency property of the Auxiliary Problem Principle when it is applied to large-scale Optimal Power Flow problems with Distributed or Parallel computation features. The key features and factors affecting the convergence ratio and solution stability of APP are also analyzed.
The Optimal Design of Passive Shimming Elements for High Homogeneous Permanent Magnets Utilizing Sensitivity Analysis
Yao, Yingying ; Choi, Yong-Kwon ; Koh, Chang-Seop ;
Journal of Electrical Engineering and Technology, volume 1, issue 4, 2006, Pages 461~465
DOI : 10.5370/JEET.2006.1.4.461
This paper presents a useful and simple method to design the passive skimming system for homogeneous permanent magnets based on numerical optimization. To simulate the effects of manufacturing and assembling tolerances, the actual geometrical parameter of the magnet with a derivation is suggested. Then, the optimal design model oi a passive shim system is set up to correct the derivative of field homogeneity. The numbers, sizes and locations of the passive shims are optimized by the steepest descent algorithm combined with design sensitivity analysis. Two implementations show that the proposed method can achieve the required homogeneity of the field with the minimum quantity of ferromagnetics.
Optimum Design of BLDC Motor for Cogging Torque Minimization Using Genetic Algorithm and Response Surface Method
Jeon, Mun-Ho ; Kim, Dong-Hun ; Kim, Chang-Eob ;
Journal of Electrical Engineering and Technology, volume 1, issue 4, 2006, Pages 466~471
DOI : 10.5370/JEET.2006.1.4.466
This raper presents a new optimization method combining the genetic algorithm with the response surface method for the optimum design of a Brushless Direct Current motor. The method utilizes a regression function approximating an objective function and the window moving and zoom-in method so as to complement disadvantages of both the genetic algorithm and response surface method. The results verify that the proposed method is powerful and effective in reducing cogging torque by optimizing only a few decisive design factors compared with the conventional stochastic methods.
Design and Analysis of Rolled Rotor Switched Reluctance Motor
Eyhab, El-Kharashi ;
Journal of Electrical Engineering and Technology, volume 1, issue 4, 2006, Pages 472~481
DOI : 10.5370/JEET.2006.1.4.472
In the conventional SRM with multi-rotor teeth, the air gap must be very small in order to drive the SRM in the saturation region that is necessary for high output torque. However, this leads to the problem of overheating; particularly in the case of a small-size SRM This paper discusses the design of a new type of SRM, namely the rolled rotor SRM. This new type does not require more than a single region of a very small airgap. This solves the overheating problem in the small size SRM. Moreover, the use of the rolled rotor, instead of the conventional toothed rotor, grades the airgap region in a fashion that gives a smooth variation in the reluctance and smooth shapes of both current and torque. The latter functional behavior is required in many applications such as servo applications. The paper first addresses general design steps of the rolled rotor SRM then proceeds to the simulation results of the new SRM in order to evaluate the advantages gained from the new design. In addition, this paper compares the torque ripples obtained from the new design to its equivalent conventional one.
Generalized State-Space Modeling of Three Phase Self-Excited Induction Generator For Dynamic Characteristics and Analysis
Kumar Garlapati Satish ; Kishore Avinash ;
Journal of Electrical Engineering and Technology, volume 1, issue 4, 2006, Pages 482~489
DOI : 10.5370/JEET.2006.1.4.482
This paper presents the generalized dynamic modeling of self-excited induction generator (SEIG) using state-space approach. The proposed dynamic model consists of induction generator; self-excitation capacitance and load model are expressed in stationary d-q reference frame with the actual saturation curve of the machine. An artificial neural network model is implemented to estimate the machine magnetizing inductance based on the knowledge of magnetizing current. The dynamic performance of SEIG is investigated under no load, with the load, perturbation of load, short circuit at stator terminals, and variation of prime mover speed, variation of capacitance value by considering the effect of main and cross-flux saturation. During voltage buildup the variation in magnetizing inductance is taken into consideration. The performance of SEIG system under various conditions as mentioned above is simulated using MATLAB/SIMULINK and the simulation results demonstrates the feasibility of the proposed system.
Design of Single-Phase Line-Start Permanent Magnet Motor Using Equivalent Circuit Method
Kwon, Sun-Hyo ; Lee, Chul-Kyu ; Kwon, Byung-Il ;
Journal of Electrical Engineering and Technology, volume 1, issue 4, 2006, Pages 490~495
DOI : 10.5370/JEET.2006.1.4.490
In this research, the design procedure and the design method of a single-phase line-start permanent magnet motor (LSPM) are proposed. In the design procedure, the permanent magnet is designed first and the windings and capacitors are designed later. As well, the points of design of each design parameter are explained. In the design of the single-phase LSPM, the equivalent circuit method is combined with the finite element method (FEM) because it has a shorter analysis time than FEM. The 400 watts single-phase LSPM is designed and manufactured. The characteristics of the manufactured single-phase LSPM are analyzed and experimented. From the analysis result and the experiment result, it is verified that the design procedure and the design method of the single-phase LSPM is valid.
The Development of the Buck Type Electronic Dimming Ballast for 250W MHL
Jung, Dong-Youl ; Park, Chong-Yeon ;
Journal of Electrical Engineering and Technology, volume 1, issue 4, 2006, Pages 496~502
DOI : 10.5370/JEET.2006.1.4.496
In this paper, we studied the development of the electronic ballast for 250W MH (Metal-Halide) lamps. We were able to improve the input power factor by using a PFC IC. To provide the lamp with the rated voltage required, we used the buck-type dc-dc converter. The stress of the switching devices in the inverter could be reduced by this method. To eliminate the acoustic resonance phenomena of MH lamps, the voltage of the lamp added the high frequency sine-wave to the low frequency square-wave by using the full bridge typed inverter. We have developed a simple igniter using the L and C elements. We could control the dimness of the lamp by varying the output voltage of the buck converter. The buck converter output voltage could be controlled by using a microprocessor.
Unified Power Quality Conditioner for Compensating Voltage Interruption
Han, Byung-Moon ; Cho, Bo-Hyung ; Sul, Seung-Ki ; Kim, Jae-Eon ;
Journal of Electrical Engineering and Technology, volume 1, issue 4, 2006, Pages 503~512
DOI : 10.5370/JEET.2006.1.4.503
This paper proposes a new configuration for the Unified Power Quality Conditioner, which has a DC/DC converter with super-capacitors for energy storage. The proposed UPQC can compensate the reactive power, harmonic current, voltage sag and swell, voltage imbalance, and voltage interruption. The performance of the proposed system was analyzed through simulations with PSCAD/EMTDC software. The feasibility of system implementation is confirmed through experimental works with a prototype. The proposed UPQC has ultimate capability to improve the power quality at the point of installation on power distribution systems and industrial power systems.
Development of Communication Protocol Verification Tool for Vital Railway Signaling Systems
Hwang, Jong-Gyu ; Jo, Hyun-Jeong ; Lee, Jae-Ho ;
Journal of Electrical Engineering and Technology, volume 1, issue 4, 2006, Pages 513~519
DOI : 10.5370/JEET.2006.1.4.513
As a very important part in development of the protocol, verifications for developed protocol specification are complementary techniques that are used to increase the level of confidence in the system functions by their specifications. Using the informal method for specifying the protocol, some ambiguity may be contained therein. This indwelling ambiguity in control systems can cause the occurrence of accidents, especially in the case of safety-critical systems. To clear the vagueness contained in the designed protocol, we use the LTS (Labeled Transition System) model to design the protocol for railway signaling. And then, we verify the safety and the liveness properties formally through the model checking method. The modal
-calculus, which is an expressive method of temporal logic, has been applied to the model checking method. We verify the safety and liveness properties of Korean standard protocol for railway signaling systems. To perform automatic verification of the safety and liveness properties of the designed protocol, a communication verification tool is implemented. The developed tools are implemented by C++ language under Windows XP. It is expected to increase the safety and reliability of communication protocol for signaling systems by using the developed communication verification tool.
Comparative Study on Electrical Discharge and Operational Characteristics of Needle and Wire-Cylinder Corona Chargers
Intra, Panich ; Tippayawong, Nakorn ;
Journal of Electrical Engineering and Technology, volume 1, issue 4, 2006, Pages 520~527
DOI : 10.5370/JEET.2006.1.4.520
The electrical discharge and operational characteristics of needle and wire-cylinder corona charger based on current measurements for positive and negative coronas were evaluated and compared. A semi-empirical method was used to determine the ion concentrations in the charging zone and at the outlet of both chargers. Results from experimental investigation revealed that magnitudes of the charging current from the wire-cylinder charger were approximately 3.5 and 2 times smaller than those from the needle charger for the positive and negative coronas, respectively. The ion number concentrations at the outlet for positive corona of both chargers were higher than fur negative corona at the same voltage. Flow and electric fields in the charging zone of both chargers were also analyzed via numerical computation. Strong electric field strength zone was identified and led to high charging and particle deposition. Effect of particle deposition on the evolution of discharge current was presented. It was shown that ions loss inside the wire-cylinder charger was higher than the needle charger The particle deposited on the corona electrodes and on the grounded cylinder caused a great reduction in charging efficiency of both chargers.
Pulse-Sequence Analysis of Discharges in Air, Liquid and Solid Insulating Materials
Suwayno, Suwayno ; Mizutani, Teruyoshi ;
Journal of Electrical Engineering and Technology, volume 1, issue 4, 2006, Pages 528~533
DOI : 10.5370/JEET.2006.1.4.528
Electrical discharges may occur in gas, liquid as well as solid insulating materials. This paper describes the investigation results on the discharges in air, silicone oil and low density polyethylene (LDPE) using needle plane electrode system under AC voltage of 50 Hz. The experimental results showed that for discharge in air (corona), discharge pulses were concentrated around the peak of applied voltage at negative half cycle. For silicone oil positive as well as negative discharges were observed which concentrated around the peak of applied voltage. The positive pulse number was smaller but the magnitude was higher than that of negative discharge. Discharges in void took place at wider range of phase of applied voltage. The unbalance in pulse number and magnitude similar to that of oil discharges were observed. For electrical treeing in LDPE, the discharges were spread before the zero cross of the applied voltage up to the peak at both positive and negative half cycles. The discharge pulse sequence analysis indicated that the PD occurrence in air, oil and void were strongly affected by the magnitude of applied voltage. However, for electrical treeing it was observed that the discharge occurrence was strongly affected by the time derivative of the applied voltage (dv/dt).
Effects of the Insulation Quality on the Frequency Response of Power Transformers
Abeywickrama Nilanga ; Ekanayake Chandima ; Serdyuk Yuriy V. ; Gubanski Stanislaw M. ;
Journal of Electrical Engineering and Technology, volume 1, issue 4, 2006, Pages 534~542
DOI : 10.5370/JEET.2006.1.4.534
This paper presents results of frequency domain spectroscopy (FDS) measurements on oil-impregnated pressboard insulation, their analyses and use of the data for modeling high frequency response (FRA) of transformers. The dielectric responses were measured in a broad frequency range, i.e. from 0.1 mHz to 1 MHz, on model samples containing different amount of moisture. The responses were parameterized with terms representing dc conductivity, low frequency dispersion and Cole-Cole polarization mechanisms and they were thereafter used to model the FRA response of a three-phase transformer.
Surface Photovoltage in Electron Beam Irradiation Semi-insulating GaAs
Yu, Jae-In ; Lim, Jin-Hwan ; Yu, Jae-Yong ; Kim, Ki-Hong ;
Journal of Electrical Engineering and Technology, volume 1, issue 4, 2006, Pages 543~545
DOI : 10.5370/JEET.2006.1.4.543
Surface photovoltage (SPV) measurements were performed to investigate the optic-electrical properties in the electron beam irradiation semi-insulating GaAs (e-beam irradiation SI-GaAs) and semi-insulating GaAs (SI-GaAs). The signal intensity showed stronge. dependency on the frequency in the SI-GaAs than it did in the e-beam irradiation SI-GaAs. This result indicates that the number of the generated photo-carriers depends on the surface state. Also, the B region of the e-beam irradiation SI-GaAs found a weak signal. This result was explained by the surface and internal damage with e-beam irradiation.
Study of Neuron Operation using Controlled Chaotic Instabilities in Brillouin-Active Fiber Based Neural Networks
Kim, Yong-K. ; Huh, Do-Geun ; Kim, Kwan-Woong ; Yu, C. ;
Journal of Electrical Engineering and Technology, volume 1, issue 4, 2006, Pages 546~549
DOI : 10.5370/JEET.2006.1.4.546
In this paper the neuron operation based on Brillouin-active fiber in optical fiber is described. The inherent optical feedback by the backscattered stokes wave in optical fiber leads to instabilities in the form of optical chaos. Controlling of chaos induced transient instability in Brillouin-active fiber is implemented with Kerr nonlinearity having a non-instantaneous response in network systems. The controlling chaotic instabilities can lead to multistable periodic states; create optical logic 'on' or high level '1' or 'off', or low level '0'. It is theoretically possible to apply the multi-stability regimes as an optical memory device for encoding and decoding series and complex data transmission in optical systems.