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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 60, Issue 12 - Dec 2011
Volume 60, Issue 11 - Nov 2011
Volume 60, Issue 10 - Oct 2011
Volume 60, Issue 9 - Sep 2011
Volume 60, Issue 8 - Aug 2011
Volume 60, Issue 7 - Jul 2011
Volume 60, Issue 6 - Jun 2011
Volume 60, Issue 5 - May 2011
Volume 60, Issue 4 - Apr 2011
Volume 60, Issue 3 - Mar 2011
Volume 60, Issue 2 - Feb 2011
Volume 60, Issue 1 - Jan 2011
Selecting the target year
Evaluation of Power Quality Cost Based on Value-Based Methodology and Development of Unified Index
Lee, Buhm ; Kim, Kyoung-Min ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 7, 2011, Pages 1293~1298
DOI : 10.5370/KIEE.2011.60.7.1293
This paper presents an Unified Index which can evaluate a performance of a distribution system based on value-based methodology. Reliability cost and voltage sags cost are calculated for each load point using Reliability Sector Customer Damage Function(SCDF). Aging cost is calculated for each load point using Aging SCDF. Power loss cost and operation cost are calculated for the system. By summation of each cost of load point and system, power quality cost can be obtained. Finally, this paper developed an unified index which can show the performance of a distribution system. Presented method has been applied to a real system, the usefulness of the method has been verified.
Supervised Shutdown of an Off-shore Wind Farm to meet the Grid Code in a Storm-driven Situation
You, Yue ; Kim, Yeon-Hee ; Zheng, Tai-Ying ; Kang, Yong-Cheol ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 7, 2011, Pages 1299~1304
DOI : 10.5370/KIEE.2011.60.7.1299
A wind turbine (WT) should be shut down as fast as possible to minimize its own damage in a storm-driven situation. Shutdown of a large wind farm requires a power grid to have a ramp-up capability large enough to balance between generation and consumption of electrical energy. This paper proposes a supervised shutdown algorithm of a wind farm to meet a required ramp-down rate in a grid code in the case of a storm-driven situation. The information on the speed and the direction of wind is measured at a wind mast (WM) installed around a wind farm. If the wind speed exceeds a cut-out speed, the number of WTs to be shut down simultaneously is decided to meet a required ramp-down rate of a grid-code. Arrival times to each WT from the WM are calculated and sorted in the order of time. Then a sequence of groups is generated. The shutdown start/end times of each group are decided to avoid superposition between adjacent two groups. The performance of the proposed shutdown algorithm is verified under various storm scenarios. Results indicate that the proposed algorithm can not only protect the wind farm in the case of a storm-driven situation but also meet the required ramp-down rate. In addition, the algorithm can produce more energy than that of a conventional shutdown algorithm.
Web based Online Real-time Reliability Integrated Information System in Composite Power System Considering Wind Turbine Generators
Cho, Kyeong-Hee ; Choi, Jae-Seok ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 7, 2011, Pages 1305~1313
DOI : 10.5370/KIEE.2011.60.7.1305
Web based online real-time reliability integrated information system is asked rapidly for more efficiency and demand response in recent. As the utilization of renewable resources has been receiving considerable attention in recent years, the information system requirement is increased. Specially, the reliability information system is more important for implementing the smart grid. This paper describes architecture of the WORRIS(Web based Online Real-time Reliability Integrated Information System) Version 7.0 system that simulates the reliability indices in composite power system considering wind turbine generators(WTG) developed successfully in this paper. And we had simulated the case study using Jeju island power system data.
A Daily Scheduling of Generator Maintenance using Fuzzy Set Theory combined with Genetic Algorithm
Oh, Tae-Gon ; Choi, Jae-Seok ; Baek, Ung-Ki ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 7, 2011, Pages 1314~1323
DOI : 10.5370/KIEE.2011.60.7.1314
The maintenance of generating units is implicitly related with power system reliability and has a tremendous bearing on the operation of the power system. A technique using a fuzzy search method which is based on fuzzy multi-criteria function has been proposed for GMS (generator maintenance scheduling) in order to consider multi-objective function. In this study, a new technique using combined fuzzy set theory and genetic algorithm(GA) is proposed for generator maintenance scheduling. The genetic algorithm(GA) is expected to make up for that fuzzy search method might search the local solution. The effectiveness of the proposed approach is demonstrated by the simulation results on a practical size test systems.
Development of the Gateway in IEC61850 based Substation for Smart Grid
Yun, Seok-Yeul ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 7, 2011, Pages 1324~1330
DOI : 10.5370/KIEE.2011.60.7.1324
This paper presents the development of gateway for smart grid for the interoperable communication between IEC 61850 station leveled devices and one of legacy Modbus, DNP3, and IEC60870-5-101/104/103 communication protocol devices of bay level in substation or for the exchange of information between IEC 61850 substation and SCADA control center. The data-mapping model is designed for the exchange of information and the gateway configuration tool is developed for generating meta-data based on XML Schema. this paper is mostly concerned with the design and realization of gateway system for the interoperable data communication between a legacy protocol device and IEC61850 based devices or systems.
A Novel Frequency Tracker for Islanded-Mode Operation in Microgrid
Jeon, Jin-Hong ; Kim, Kyoung-Hoon ; Hwang, Chul-Sang ; Kim, Jang-Mok ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 7, 2011, Pages 1331~1338
DOI : 10.5370/KIEE.2011.60.7.1331
This paper proposes a method for frequency control of islanded microgrid with battery energy storage system. For frequency control of islanded microgrid, battery energy storage system uses a phase locked loop algorithm with positive sequence components for a fast frequency estimation. Microgrid is a power system with small inertia because it has small capacity generators and inverter systems for renewable energy. So, Islanded microgrid's frequency varies fast and large as small generation and load changes. To reduce frequency variation of islanded microgrid, it needs a device with fast frequency response. For fast frequency response, a fast frequency tracking is important. To show the validation of proposed fast frequency tracking algorithm, battery energy storage system with proposed algorithm is tested in microgrid pilot plant.
A Study on Effect Analysis of Integrated Demand Management According to Energy System Management Model
Kim, Yong-Ha ; Jo, Hyeon-Mi ; Kim, Young-Gil ; Park, Hwa-Yong ; Kim, Hyeong-Jung ; Woo, Sung-Min ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 7, 2011, Pages 1339~1346
DOI : 10.5370/KIEE.2011.60.7.1339
This paper is developed to demand management scenario of energy consumption efficiency improvement, electricity generation efficiency improvement, network efficiency improvement, change of distribution ratio, movement of energy source, change of heating system, put of CHP to quantitatively assess to impact on energy use of demand management at the national level. This scenario can be applied Energy System Management model was developed based on Energy Balance Flow. In addition, effect analysis through built demand management scenario was quantitatively evaluated integrated demand management effectiveness of energy cost saving, CO2 emission reduction and energy savings of national level by calculating to primary energy source usage change in terms of integration demand management effect more often than not a single energy source separated electricity, heat and gas.
Agent-based Colored Petri Net Modeling of Grid Information Flows : Modeling of Wide Area Protection System
Park, Byung-Sung ; Hur, Kyeon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 7, 2011, Pages 1347~1353
DOI : 10.5370/KIEE.2011.60.7.1347
While most of the existing protection schemes have been designed with local information around individual components, these local schemes are not considered capable of protecting the modern electric power gird with growing complexity. Recent blackouts in North America and Europe have renewed the emphasis on coordinated protection and control actions to avoid systemwide blackouts, utilizing all of the available grid information. Thus, this paper proposes a new methodology, Agent-based Colored Petri Net (ACPN) modeling for systematically representing, modeling and analyzing information flows and interactions among the entities of the electric power grid. The paper demonstrates its efficacy and accuracy by investigating an ACPN model of a wide area protection system for a typical power grid. The proposed modeling and analysis schemes may further provide a framework to help assure reliability and interoperability of diverse smart grid components.
Optimization of SMES Windings Utilizing the First-Order Reliability Method
Kim, Dong-Wook ; Jung, Sang-Sik ; Sung, Young-Hwa ; Kim, Dong-Hun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 7, 2011, Pages 1354~1359
DOI : 10.5370/KIEE.2011.60.7.1354
This paper presents a novel methodology for improving the reliability of electromagnetic devices and machines based on the reliability-based design optimization method. To achieve this, the method includes reliability analysis and optimization process taking into account uncertainties of design variables. One of the first-order reliability analysis techniques, called reliability index approach, is adopted to evaluate the reliability of performance functions with respect to probabilistic design variables. The proposed method has been successfully applied to designing a superconducting magnetic energy storage system. For verifying the efficiency and accuracy of the method, the results are compared with those of conventional optimization methods.
A Study on the Control of Electro-Hydraulic Motors Using Ahead Predictive Adaptive Control Method
Kim, Byeong-Woo ; Hur, Jin ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 7, 2011, Pages 1360~1365
DOI : 10.5370/KIEE.2011.60.7.1360
Electro-hydraulic servo motor is used to a lot of in the field of industrial equipment which requires one of the control functions among pressure, flow, and power output. In this paper, linear discrete reference model of the electro-hydraulic servo motor system are made for 1-step ahead predictive control. The parameters of electro-hydraulic servo motor system are estimated using the recursive least square method. 1-step ahead predictive model output of electro-hydraulic servo motor system corresponded to reference model output in spite of estimated parameters are not meet real parameters. Control performance affections are studied due to the forgetting factors variation.
The Efficiency Characteristics of LLC Half-Bridge Resonant Converter
Kim, Sung-Wan ; Kim, Chang-Sun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 7, 2011, Pages 1366~1371
DOI : 10.5370/KIEE.2011.60.7.1366
The resonant converter cause the high voltage stress according to the input voltage, which increases the conduction loss in converter power switches. The topology of LLC half bridge resonant converter provides ZVS characteristic and also the stress of voltage and current is smaller than that of the general resonant converters. So we can expect the higher efficiency. In this paper, the analysis of the characteristics of the converter efficiency and the best conditions for highest efficiency were investigated. As a result, the efficiency of utilizing up to 93% is achieved.
Sensorless MPPT Control using a Boost Converter and a Grid Side Inverter in Wind Power Generation Systems
Kim, Do-Yoon ; Lee, Jun-Min ; Kim, Young-Seok ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 7, 2011, Pages 1372~1377
DOI : 10.5370/KIEE.2011.60.7.1372
This paper proposes the control method of MPPT(maximum power point tracking) for the wind energy generation system using the duty ratio control of boost type DC-DC converter. For a lower cost and a higher reliability, the wind and the generator velocity sensors are removed. MPPT control is implemented by changing the duty ratio of the boost converter. Chain rule is applied by using each function. The grid side inverter is controlled to regulate unity power factor. The proposed control method was analyzed mathematically and verified by the computer simulation using PSIM.
Analysis of Electromagnetic Shielding Performance for a BiMODAL Tram using an Electromagnetic Concentration Index
Choi, Nak-Sun ; Jeung, Gi-Woo ; Kim, Nam-Kyung ; Song, Myung-Kon ; Lee, Kang-Won ; Mok, Jai-Kyun ; Kim, Dong-Hun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 7, 2011, Pages 1378~1384
DOI : 10.5370/KIEE.2011.60.7.1378
In this paper, the electromagnetic shielding performance of a BiMODAL Tram is investigated by means of an electromagnetic analysis tool, called HFSS. For the purposed of doing this, first, three-dimensional finite element modeling for the tram including electronic devices and engine room is carried out. Then, for quantitatively assessing the electromagnetic shielding performance of the tram's body, concentration indexes for electric field magnitude and time-average stored electric energy are introduced. From numerical results, it is inferred that the tram's body can protect the electronic devices and engine room against external electromagnetic waves from 30 MHz to 100 MHz.
Design of a Broadband Microwave Power Divider/Combiner using Coaxial-Conical-Radial Transmission Line Conversion
Choi, Young-Kyu ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 7, 2011, Pages 1385~1390
DOI : 10.5370/KIEE.2011.60.7.1385
A coaxial-conical-radial transmission line conversion circuits have been investigated to realize a low loss high performance microwave power divider/combiner. In order to optimize the characteristics of the device, the power divider/combiner was designed separately with two parts-the inner part and the outer part. Utilizing the rectangular approximation of the outer part, we can design the low loss device which is not affected by the partition number N of the outer part. The small return loss which is lower than 20dB was obtained on the frequency range of 5.15GHz(7.45~12.60GHz). A conical connector was employed for smooth connection between the central coaxial line and the outer radial line. Making use of the
2-stage conical connector, the return loss lower than 30dB was obtained on the operating frequency range of 5GHz. The total return loss of the designed divider/combiner was lower than 20dB on the frequency range of 5GHz for the partition number N=11, N=12 and N=16.
A Study on Analysis of Disturbance in VLC Transceiver Module Based on LED Communication
Hong, Geun-Bin ; Jang, Tae-Su ; Kim, Tae-Hyung ; Kim, Yong-Kab ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 7, 2011, Pages 1391~1395
DOI : 10.5370/KIEE.2011.60.7.1391
In this paper, would implement a transceiver for the visible light communication that based on wireless communication driving technology for LED illumination-based infrared ray communication, and measurement analyzed a design error rate of a transceiver variable rate has made about distance change -2.5m. The error rate measured a voltage variable along illuminate change between switchable circumstances, which has illuminated insight and outright. Each analyzed and measurement on the communication distance errors along the differences of disturbance light between night and days. The LED module has implemented for number of 6 through illumination dimming in case of different values. Also, implementation for the system module of a VLC transceiver based on the infrared sensors which used feedback outcome value has analyzed with error rate.
Design of HCBKA-Based IT2TSK Fuzzy Prediction System
Bang, Young-Keun ; Lee, Chul-Heui ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 7, 2011, Pages 1396~1403
DOI : 10.5370/KIEE.2011.60.7.1396
It is not easy to analyze the strong nonlinear time series and effectively design a good prediction system especially due to the difficulties in handling the potential uncertainty included in data and prediction method. To solve this problem, a new design method for fuzzy prediction system is suggested in this paper. The proposed method contains the followings as major parts ; the first-order difference detection to extract the stable information from the nonlinear characteristics of time series, the fuzzy rule generation based on the hierarchically classifying clustering technique to reduce incorrectness of the system parameter identification, and the IT2TSK fuzzy logic system to reasonably handle the potential uncertainty of the series. In addition, the design of the multiple predictors is considered to reflect sufficiently the diverse characteristics concealed in the series. Finally, computer simulations are performed to verify the performance and the effectiveness of the proposed prediction system.
Navigation of a Mobile Robot Using Nonlinear Least Squares Optimization
Kim, Gon-Woo ; Cha, Young-Youp ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 7, 2011, Pages 1404~1409
DOI : 10.5370/KIEE.2011.60.7.1404
The fundamental research for the mobile robot navigation using the numerical optimization method is presented. We define the mobile robot navigation problem as an unconstrained optimization problem to minimize the cost function with the pose error between the goal position and the position of a mobile robot. Using the nonlinear least squares optimization method, the optimal speeds of the left and right wheels can be found as the solution of the optimization problem. Especially, the rotational speed of wheels of a mobile robot can be directly related to the overall speed of a mobile robot using the Jacobian derived from the kinematic model. It will be very useful for applying to the mobile robot navigation. The performance was evaluated using the simulation.
A Study on the Development of Corrosion Detecting System for 22.9 kV Distribution Power Line Insulation Cable
Kim, Yong-Jun ; Oh, Yong-Cheul ; Yi, Keon-Young ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 7, 2011, Pages 1410~1416
DOI : 10.5370/KIEE.2011.60.7.1410
A corrosion detecting system for 22.9 kV distribution power line insulation cable, which can travel autonomously along the live line, is proposed. Eddy current test method is employed to detect the corrosion, and the system developed here is capable of detecting internal corrosion of a ACSR-OC. Somewhat details of the electrical and mechanical mechanism of the system and traveling algorithm are introduced. Experimental results applied to the sample cables having artificial corrosion and the operating distribution lines are provided. From the result, we confirmed that the system is useful for detecting internal corrosion of a ACSR, and is expected to be a new non-destructive testing equipment in the area of diagnosis for the distribution power line.
Development of a Cardiac Catheter Remote Control Robot Platform for Radiofrequency Ablation Intervention
Park, Jun-Woo ; Song, Seung-Joon ; Lee, Jung-Chan ; Choi, Hyuk ; Lee, Jung-Joo ; Choi, Jae-Soon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 7, 2011, Pages 1417~1426
DOI : 10.5370/KIEE.2011.60.7.1417
Radiofrequency ablation through cardiac catheterization is one of minimally invasive intervention procedures used in drug resistant arrhythmia treatment. To facilitate more accurate and precise catheter navigation, systems for robotic cardiac catheter navigation have been developed and commercialized. The authors have been developing a novel robotic catheter navigation system. The system is a network-based master-slave configuration 3-DOF (Degree-Of-Freedom) robotic manipulator for operation with conventional cardiac ablation catheter. The catheter manipulation motion is composed of the translation (forward/backward) and the roll movements of the catheter and knob rotation for the catheter tip articulation. The master manipulator comprises an operator handle compartment for the knob and the roll movement input, and a base platform for the translation movement input. The slave manipulator implements a robotic catheter platform in which conventional cardiac catheter is mounted and the 3-DOF motions of the catheter are controlled. The system software that runs on a realtime OS based PC, implements the master-slave motion synchronization control in the robot system. The master-slave motion synchronization performance tested with step, sinusoidal and arbitrarily varying motion commands showed satisfactory results with acceptable level of steady state error. The developed system will be further improved through evaluation of safety and performance in in vitro and in vivo tests.
Excitation Frequency Characteristics of a Conductive Fabric Sensor Using the Bio-impedance for Estimating Knee Joint Movements
Lee, Byung-Woo ; Lee, Chung-Keun ; Kim, Jin-Kwon ; Jeong, Wan-Jin ; Lee, Myoung-Ho ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 7, 2011, Pages 1427~1433
DOI : 10.5370/KIEE.2011.60.7.1427
This study describes a conductive fabric sensor and determines an optimum excitation frequency of the sensor to evaluate knee joint movements. Subjects were composed of 15 males (age:
) with no known problems with their knee joints. The upper side of subjects' lower limbs was divided into two areas and the lower side of subjects' lower limbs was divided into three areas. The sensors were attached to 1 for 3 spot from a hip joint and to 3 for 4 spot from a knee joint which are the optimum conductive fabric sensor configuration to evaluate knee joint movements. As a result, the optimum excitation frequency for evaluating knee joint movements using conductive fabric sensors was 25 kHz. Average and standard deviation of bio-impedance changes from 15 subjects were
at 25 kHz. The difference of bio-impedance changes between 25 kHz and 50 kHz was statistically significant (p<0.05) and the difference of bio-impedance changes between 25 kHz and 100 kHz was also statistically significant (p<0.001). These results showed that conductive fabric sensors are more sensitive to measure bio-impedance for evaluating knee joint movements as an excitation frequency decreases.
Precision Measurement of Silicon Wafer Resistivity Using Single-Configuration Four-Point Probe Method
Kang, Jeon-Hong ; Yu, Kwang-Min ; Koo, Kung-Wan ; Han, Sang-Ok ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 7, 2011, Pages 1434~1437
DOI : 10.5370/KIEE.2011.60.7.1434
Precision measurement of silicon wafer resistivity has been using single-configuration Four-Point Probe(FPP) method. This FPP method have to applying sample size, shape and thickness correction factor for a probe pin spacing to precision measurement of silicon wafer. The deference for resistivity measurement values applied correction factor and not applied correction factor was about 1.0 % deviation. The sample size, shape and thickness correction factor for a probe pin spacing have an effects on precision measurement for resistivity of silicon wafer.
Analysis on the Improvement of Power Capacity Increase in the Transformer-Type SFCL with Neutral Lines
Cho, Yong-Sun ; Choi, Hyo-Sang ; Kim, Deog-Goo ; Go, Sung-Pil ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 7, 2011, Pages 1438~1443
DOI : 10.5370/KIEE.2011.60.7.1438
The increase of power capacity in the superconducting fault current limiter (SFCL) is essential for application into the power grid. To achieve this, when superconducting units were connected in series and parallel, the unbalanced quenching characteristics between superconducting units generated by different critical current behavior should be improved. In the transformer-type SFCL, the superconducting units connected in series could be simultaneously quenched by the connection of neutral lines between secondary coils and superconducting units. From this the consumed power in superconducting units was equally distributed. In addition, the more the turn ratio of the transformer was reduced, the more consumed power in the superconducting units was reduced by the decrease of the induction voltage generated in the superconducting units. From those results, the transformer-type SFCL using neutral lines could increase the power capacity of the SFCL by the equal power division into the superconducting units.
Improvement of Obstruction Detecting Method at Railroad Crossing by Image Analyze
Song, Hyeon-Sam ; Kim, Young-Dal ; Lee, Dae-Dong ; Shim, Jae-Myung ;
The Transactions of The Korean Institute of Electrical Engineers, volume 60, issue 7, 2011, Pages 1444~1450
DOI : 10.5370/KIEE.2011.60.7.1444
An analysis of the causes of railroad crossing accidents reveals that most train collision accidents that occur when safety crossing devices are functioning normally occur because vehicles either experience engine failure on the tracks or because drivers were not notified of the coming train, in which case they get trapped on the tracks when the crossing barriers descend. To prevent such an accident, obstacle detection device by using laser beams detecting the presence of obstacle and crossing bar direction controller by moving direction detection sensor using the Earth's magnetic field detection technology are used in the railroad crossing. Despite using the obstacles detector and crossing bar direction controller in the railroad crossing, the equipments for the railroad crossing does not prevent accidents completely. Therefore, this research has studied new method that can detect obstacles through image analyze and alternate existing equipments. There will be excellent effect to be preventing railroad crossing accident by developing a reliable and new obstacle detecting device.