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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
A Study on the Transmission Overload Relief by Fast Switching
Cho, Yoon-Sung ; Lee, Han-Sang ; Jang, Gilsoo ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 8, 2013, Pages 1053~1058
DOI : 10.5370/KIEE.2013.62.8.1053
Because of computational burden and complex topology of substation, a transmission overload relief using circuit-breaker switching was very complex and difficult. However, a on-line algorithm for reducing the overloads in transmission lines has made progress due to the advance of IT technology. This paper describes the methodology for alleviating the overloads in transmission lines by circuit-breaker switching. First, the severe contingency lists and substations were selected from the results of contingency analysis. Then the switch combinations are determined using circuit-breakers of the selected substation. The topology changes are limited to equipment outage, bus split, island split, bus merge and island merge. Finally, the fast screening and full analysis methods are used to analyze the overload in transmission lines. To verify the performance of the proposed methodology, we performed a comprehensive test for both test system and large-scale power systems. The results of these tests showed that the proposed methodology can accurately alleviate the overloads in transmission lines from online data and can be applied to on-line applications.
LVRT Scheme for Doubly Fed Induction Generator Systems Based on Flux Tracking Method
Park, Sun-Young ; Chun, Yeong-Han ; Lee, Dong-Myung ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 8, 2013, Pages 1059~1065
DOI : 10.5370/KIEE.2013.62.8.1059
Doubly Fed Induction Generator(DFIG) systems occupy the largest proportion of worldwide wind energy generation market. DFIG systems are very sensitive to grid disturbances especially to voltage dips due to the structure of the stator connected to grid. In the past, when a grid fault occurs generators are separated from grid(trip method) in order to protect the systems. Nowadays, due to the growing penetration level of wind power, many countries have made some requirements that wind turbines are required to have Low Voltage Ride Through(LVRT) capability during grid faults. In this paper, a flux tracking LVRT control strategy based on system modeling equations is proposed. The validity of the proposed strategy is verified through computer simulations.
Development of Outage Cost Impact Index Function of Electricity Energy and Outage Cost Assessment using WOROCAIS
Lim, Jin-Taek ; Choi, Jae-Seok ; Jeon, Dong-Hoon ; Seo, Chul-Soo ; Lee, Jae-Gul ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 8, 2013, Pages 1066~1073
DOI : 10.5370/KIEE.2013.62.8.1066
This paper illustrates newly an outage cost impact index function(OCIIF). The assessment of the OCIIF is described using the Web Based Online Real-time Outage Cost Assessment and Information System(WOROCAIS) for power system outage cost assessment in Korea. The proposed OCIIF is not absolute but relative outage cost impact index function in view point of outage time using web based survey method for outage cost assessment. While conventional methodology does not consider short time outage cost assessment, the proposed OCIIF reflects short time outage. SCOF(Sector Customer Outage Function) in stead of the traditional SCDF(Sector Customer Damage Function) is defined and proposed newly in this paper. Based the SCOF, AVLL(Average Value of Loss Load) is newly proposed. The OCIIF is demonstrated by WOROCAIS in case study around 2,000 sample data surveyed by KEPCO in South Korea in recent.
State Transition Model of Demand Response Considering Behavior Patterns of Customer
Kwag, Hyung-Geun ; Lee, Na-Eun ; Kim, Jin-O ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 8, 2013, Pages 1074~1079
DOI : 10.5370/KIEE.2013.62.8.1074
Demand response(DR) is potential generation alternative to improve the reliability indices of system and load points. However, when demand resources scheduled in DR market fail to reduce demand, it can create new problems associated with maintaining a reliable supply. In this paper, a reliability model of demand resource is constructed considering customers' behaviors in the same form as conventional generation units, where availability and unavailability are associated with the simple two-state model. As a result, the generalized reliability model of demand resources is represented by multi-state model.
Optimal Design of Interior Permanent Magnet Synchronous Machines Consideration of Magnet BH Characteristic with Different Rotor Type using Response Surface Methodology
Im, Young-Hun ; Jang, Seok-Myoung ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 8, 2013, Pages 1080~1089
DOI : 10.5370/KIEE.2013.62.8.1080
Interior Permanent Magnet Synchronous Machines (IPMSMs) with rare earth magnet are widely used in electric vehicles and hybrid electric vehicles. IPMSMs having high efficiency, high torque, and a wide speed range are employed in propulsion system. And the rotor in an IPMSM is generally made of a rare earth magnet to achieve a large energy product and high torque. This paper discusses issues regarding design and performance of IPMSMs using different factors of BH magnetic characteristic. It is necessary to choose factors of magnetic material according to permanent magnet shape in rotor for high performance. Response Surface Methodology (RSM) is selected to obtain factors of magnetic material according to variety of rotor shapes. The RSM is a collection of mathematical and statistical techniques useful for the analysis of problems in which a response of interest in influenced by several variables and the objective is to optimize response. Therefore, it is necessary to analyze the torque characteristics of an IPMSM having magnet BH hysteresis curve with different rotor shape. Factors of residual flux density (Br) factor and intrinsic coercive force (Hc) are important parameters in RSM for rotor shape. The rotor shapes for IPMSMs having magnet BH characteristic were investigated using the RSM, and three shapes were analyzed in detail using FEA. The results lead to design consequence of IPMSMs in the various rare earth magnet materials.
Single-Phase Power Factor Correction AC/DC Converter with Short-term Interruption Tolerance
Lee, Dong-Su ; Lee, Wang-Geun ; Jeon, Seong-Jeub ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 8, 2013, Pages 1090~1094
DOI : 10.5370/KIEE.2013.62.8.1090
In this paper, a method to cope with short-term interruption is proposed. The proposed method uses a capacitor bank consisting of supercapacitors. A supercapacitor is a good means for energy storage for short-term usage. The proposed circuit is simple and accordingly easy to construct and to control. A prototype of 360 W single-phase PFC ac-dc converter is constructed and experimental results are presented.
A Study on Characteristics and Driving Techniques of Energy Recovery Type Inverter for Piezo Actuator Drive
Hong, Sun-Ki ; Lee, Jung-Seop ; Byeon, Nam-Hee ; Na, Yoo-Cheong ; Kang, Tae-Sam ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 8, 2013, Pages 1095~1100
DOI : 10.5370/KIEE.2013.62.8.1095
Piezo devices have large power density and simple structure compared with conventional electrical motors. Thus they can generate larger forces than the conventional actuators with small size. Their resopnses to commands are also very fast and thus the bandwidths are very wide. Thus the piezo devices are expected to be used widely in the future for actuating devices requiring fast response and large actuating force with small size. However, the piezo actuators need high voltage with high driving current due to their large capacitive property. In this paper, proposed is a simple method to drive piezo devices using voltage inversion circuit with coli inductance. The coil inductance carries the charges in the piezo device to the opposite side, inverting the polarity of the applied voltage, thus saving the power to drive the device with AC voltages. Experiments with real circuit demonstrates that the proposed scheme can improve the energy efficiency very much.
1-stage Asymmetrical LLC Resonant Converter with Low Voltage Stress Across Switching Devices
Kim, Choon-Taek ; Kim, Seong-Ju ; La, Jae-Du ; Kim, Young-Seok ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 8, 2013, Pages 1101~1107
DOI : 10.5370/KIEE.2013.62.8.1101
A light emitting diodes(LED) lighting has been increasingly used due to its low power consumption, long life time, high efficiency, and environment friendly characteristics. Also various power converters has been applied to drive these LED lighting. Among many power converters, a LLC resonant converter could be applied for LED lighting because of its high efficiency and high power density. Furthermore, the function of power factor correction(PFC) might be added. In this paper, 1-stage asymmetrical LLC resonant converter is proposed. The proposed converter performs both input-current harmonics reduction and PFC using the discontinuous conduction mode(DCM). The proposed 1-stage LLC resonant converter approach has the lower voltage stress across switching devices and achieve the zero voltage switching(ZVS) in switching devices. To verify the performance of the proposed converter, simulation and experimental results from a 300[W] prototype are provided.
Investigation of Winding Connections for Fault-Tolerant of MW Class Offshore Wind Generator with Dual 3-Phase System and Modular
Seo, Jang Ho ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 8, 2013, Pages 1108~1114
DOI : 10.5370/KIEE.2013.62.8.1108
This paper presents a new winding topology for MW class offshore wind generator having modular and dual 3-phase. Based on proposed simplified relationship between magnetic flux and phase current in the air gap, several new windings for modular and dual 3-phase are made. In case of one inverter operation or faulty operation, the proposed model can have balanced 3-phase induced voltage whereas the conventional generator with modular winding has unbalanced induced voltage, which can be important issue in offshore generator. The model was applied into 6MW prototype machine with dual 3-phase. Using finite element analysis, induced voltage, inductance were investigated. The results show that the proposed modular winding can be applicable to dual inverter system with electrically balanced voltage.
Capacitance and Output Current Control by CNT Concentration in the CNT/PVDF Composite Films for Electronic Devices
Lee, Sunwoo ; No, Im-Jun ; Shin, Paik-Kyun ; Kim, Yongjin ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 8, 2013, Pages 1115~1119
DOI : 10.5370/KIEE.2013.62.8.1115
The carbon nanotube/poly-vinylidene fluoride (CNT/PVDF) composite films for the use of electronic devices were fabricated by spray coating method using the CNT/PVDF solution, which was prepared by adding PVDF pellets into the CNT dispersed N-Methyl-2-pyrroli-done (NMP) solution. The CNT/PVDF composite films were peeled off from the glass substrate and were investigated by the scanning electron microscopy, which revealed that the CNTs were uniformly dispersed in the PVDF films and thickness of the films were approximately
. The capacitance of the CNT/PVDF films increased dramatically by adding CNTs into the PVDF matrix, and finally saturated approximately 1880 pF. However, the I-V curves didn't show any saturation effect in the CNT concentration range of 0 ~ 0.04 wt%. Therefore we can control the performance of the devices from the CNT/PVDF composite film by adjusting the current level resulted from the CNT concentration with the uniform capacitance value.
Compressed B1 Control Method in Multi-channel 3 T MRI
Yoo, Hyoungsuk ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 8, 2013, Pages 1120~1124
DOI : 10.5370/KIEE.2013.62.8.1120
Our objective of this study was to reduce radio frequency coil (RF) control time at 3 T MRI systems. A compressed method is proposed with a convex optimization and pseudo-inverse method in multi-channel RF coils. After applying the proposed methods, fields are homogenized with less field data. Even with 80% compression, the fields are well homogenized and localized, indicating that mapping requires only 20% of the original data. Detailed values are compared between each compressed result in and outside the region of interest at 3 T.
A Design of High Efficiency Microwave Wireless Power Acceptor IC
Jung, Won-Jae ; Jung, Hyo-Bin ; Kim, Sang-Kyu ; Jang, Jong-Eun ; Park, Jun-Seok ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 8, 2013, Pages 1125~1131
DOI : 10.5370/KIEE.2013.62.8.1125
Wireless power transmission technology has been studied variety. Recently, wireless power transmission technology used by resonance and magnetic induction field is applied to various fields. However, magnetic resonance and inductive coupling are have drawbacks - power transmission distance is short. Microwave transmission and accept techniques have been developed to overcome short distance. However, improvement in efficiency is required. This paper, propose a high-efficiency microwave energy acceptor IC(EAIC). Suggested EAIC is consists of RF-DC converter and DC-DC converter. Wide Input power range is -15 dBm ~ 20 dBm. And output voltage is boosted up to 5.5 V by voltage boost-up circuit. EAIC can keep the output voltage constant. Available efficiency of RF-DC converter is 95.5 % at 4 dBm input. And DC-DC efficiency is 94.79 % at 1.1 mA load current. Fully EAIC efficiency is 90.5 %.
Control for Networked Control Systems with Randomly Occurring Packet Losses and Disturbances
Lee, Tae H. ; Park, Ju H. ; Kwon, Oh-Min ; Lee, Sang-Moon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 8, 2013, Pages 1132~1137
DOI : 10.5370/KIEE.2013.62.8.1132
This paper considers the
control problem for networked control systems(NCSs). In order to solve the problem which comes from discontinuous control signal in NCSs, an approach that discontinuous control signals treat time-varying delayed continuous signals is applied to achieve
stability of NCSs. In addition, randomly occurring packet losses and disturbances are considered by introducing stochastic variables with Bernoulli distribution. Based on Lyapunov stability theory, a new stability condition is obtained via linear matrix inequality formulation to find the
controller which achieves the mean square stability of NCSs. Finally, the proposed method is applied to a numerical example in order to show the effectiveness of our results.
Electric Vehicle Charging Control System using a Smartphone Application Based on WiFi Communication
Ro, Sunny ; Lee, Kyung-Jung ; Ki, Young-Hun ; Ahn, Hyun-Sik ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 8, 2013, Pages 1138~1143
DOI : 10.5370/KIEE.2013.62.8.1138
In this paper, we propose a smartphone application based on a wireless fidelity(WiFi) in order to control the charging of electric vehicle(EV) and monitor the charging status together with the vehicle history information. The driver obtains much information on vehicle status through a smartphone application which communicates with the electric vehicle supply equipment(EVSE) management server while the EV also communicates with the EVSE for the authentification through controller area network(CAN). We also implement the simulator for the EV charging control system to verify the functions of the proposed application where the simulator consists of an EV model, an EVSE, and a smartphone. It is shown by the simulator that the proposed smartphone application allows the driver to control and to monitor the charging process of an EV conveniently and, moreover, it can provide the driver with vehicle information stored in the EVSE management server.
Stabilizing Controller Design for Time-delay Singularly Perturbed Systems by H
Norm and Lambert W Function
Kim, Beomsoo ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 8, 2013, Pages 1144~1150
DOI : 10.5370/KIEE.2013.62.8.1144
The stabilizing controller design problem of time-delay singularly perturbed systems is considered. The proposed approach is based on the
norm and the composite control method. A sufficient condition for the stability of the time-delay slow subsystem is presented. Using this condition, we can construct the composite control law for the time-delay singularly perturbed system and analysis the system by the matrix Lambert W function. Illustrated examples are presented to demonstrate the validity and applicability of the proposed method.
The Geometric Modeling for 3D Information of X-ray Inspection
Lee, Heung-Ho ; Lee, Seung-Min ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 8, 2013, Pages 1151~1156
DOI : 10.5370/KIEE.2013.62.8.1151
In this study, to clearly establish the concept of a geometric modeling I apply for the concept of Pushbroom, limited to two-dimensional radiation Locator to provide a three-dimensional information purposes. Respect to the radiation scanner Pushbroom modeling techniques, geometric modeling method was presented introduced to extract three-dimensional information as long as the rotational component of the Gamma-Ray Linear Pushbroom Stereo System, introduced the two-dimensional and three-dimensional spatial information in the matching relation that can be induced. In addition, the pseudo-inverse matrix by using the conventional least-squares method, GCP(Ground Control Point) to demonstrate compliance by calculating the key parameters. Projection transformation matrix is calculated for obtaining three-dimensional information from two-dimensional information can be used as the primary relationship, and through the application of a radiation image matching technology will make it possible to extract three-dimensional information from two-dimensional X-ray imaging.
An Adaptive Cruise Control Systems for Intelligent Vehicles in Accordance with Vehicles Distance
Bae, Jong-Il ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 8, 2013, Pages 1157~1162
DOI : 10.5370/KIEE.2013.62.8.1157
This thesis describes the active cruise control which is a part of AVHS(Advanced Vehicle and Highway System) in the ITS(Intelligent Transportation Systems). The active cruise control is a system which recognizes some obstructions and vehicles in front, drives in safe speed and puts on the brake in dangerous situations as the driver simply turns on the switch without stepping on the accelerator and brake. PID controller is used in the speed-control by linearizing the longitudinal model of the vehicle, obstacle detecting algorithm which makes use of the laser scanner is proposed to recognize the situation in front and the system's performance is tested.
A Study on the Measurement and Determination of External Loop Impedance on TN-C-S System
Yi, Geon-Ho ; Jung, Jin-Soo ; Moon, Hyun-Wook ; Kim, Sun-Gu ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 8, 2013, Pages 1163~1168
DOI : 10.5370/KIEE.2013.62.8.1163
The maximum allowable value of loop impedance(
) to secure the operation of overcurrent protective devices and the safety for indirect contact is a very important in TN-C-S system. The loop impedance is divided into inner loop impedance which consumer can adjust and external loop impedance(
) which only electric operator can adjust. Thus, an external loop impedance which limits to less than a certain value is a very important factor for human body protection against electric shock in TN-C-S system. The concept of loop impedance(
) is recently introduced to the domestic, the study about external loop impedance is yet insufficient. However, the study about the reference impedance as specified by the IEC 60725 standard to improve the quality and reliability of the power supply is being made. In this paper, reference value of external loop impedance(
) to meet domestic environment will be proposed by the nationwide measurement and statistical analysis.
IEC 61508 into PES for Train Control Systems
Kang, Shin-Ju ; Lee, Jongwoo ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 8, 2013, Pages 1169~1176
DOI : 10.5370/KIEE.2013.62.8.1169
PES have been recently required to implement railway industry for its application flexibility. The PES should be commensurated with railway safety requirements. It achieved its safety through redundant PES. The redundant systems run with voting functions. The successful major voting result becomes the output of the redundant system. The redundant system have to be synchronized to vote each output results. This paper proposed an algorithm for synchronizing and a voter. The proposed algorithm and the voter are verified using simulation.
The Evaluation of Inspection Period based on Reliability in Railway Traction Power Systems
Kim, Hyungchul ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 8, 2013, Pages 1177~1183
DOI : 10.5370/KIEE.2013.62.8.1177
In this paper, the analysis of inspection period bases on reliability is suggested in the field of traction power system. Even though there are several maintenance models, the most commonly used maintenance assessment has been focused on time based maintenance in real traction power systems. The maintenance intervals are selected on the basis of long-time experience. It ensures high availability and exact planning of staff. Reliability centered maintenance, which evaluates criticality and severity of each failure mode, achieves the operation, maintenance, and cost-effective improvement that will manage the risks of equipment. This paper deals with electrification in railway inspection frequency and applied reliability based inspection frequency instead of constant intervals. The distribution function of failure rate in traction power system belongs to Weibull function. Also, the fault data and the number of installed equipments for electrifications are collected. The failure history is investigated and classified in detail. Though these complicated procedures, it contribute to extend equipment lifetime and to reduce maintenance costs.
Analysis of Ignition Time/Current Characteristics and Energy when Series Arc-Fault Occurs at Rated 220 V
Ko, Won-Sik ; Moon, Won-Sik ; Bang, Sun-Bae ; Kim, Jae-Chul ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 8, 2013, Pages 1184~1191
DOI : 10.5370/KIEE.2013.62.8.1184
Probability of ignition due to arc-fault and energy of the arc-fault for the case of applying serial arc-fault interruption time of 120 V defined in UL 1699 to the voltage of 220 V of domestic condition and also for the case of applying it to the HIV wire type are analyzed. It has been confirmed that when the arc-fault occurs under 5 A, 10 A, and 20 A. Probability of ignition for the three different current conditions is 0.74(74%), 0.48(48%), and 0.32(32%) respectively for respective interruption time within 1 sec, 0.4 sec, and 0.2 sec. We discover that when we apply the same arc interruption time for 120 V defined in UL 1699 to the domestic environment of 220 V. The probability of ignition increases from 1.5% for 120 V condition to as much as 74% for 220 V condition. Conclusively, if we apply the standard for the serial arc-fault interruption time defined in UL 1699 for 120 V to the domestic condition of 220 V, the fire prevention effect of electric fire due to arc-fault equal to that of UL standard of 120 V can not be achieved.
Job Analysis of Ubiquitous Medical Electronic Device Export by the Method of DACUM
Cho, Dong-Heon ; Koo, Kyung-Wan ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 8, 2013, Pages 1192~1197
DOI : 10.5370/KIEE.2013.62.8.1192
In this paper Ubiquitous Medical Electronic Device Export was defined, and it's job analysis. The authors have been defined the job and classified duties and tasks of Ubiquitous Medical Electronic Device Export. To fine what is the most efficient task for Ubiquitous Medical Electronic Device Export, we have been investigated the levels of importance, difficulty, frequency and entry in each task. A DACUM committee is composed of total 12 members, which are one facilitator, 10 panel members, one coordinator & recorder to analyze the job of Ubiquitous Medical Electronic Device Export. Following is the result of this study. First, The process began with the identification of a job title and definition of Ubiquitous Medical Electronic Device Export. Second, a job model of Ubiquitous Medical Electronic Device Export is constructed based on the results of DACUM job analysis. 5 duties and 33 tasks are analyzed. Third, occupational specification was drawn up in consultation with SME council. Fourth, duty specification was drawn up in consultation. 33 tasks that are essential in entry level of occupation are identified. Fifth, task specification was drawn up in consultation. Detail task component which include skill, materials, knowledge, equipment, achievement level and tool was specified in task specification.