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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 63, Issue 12 - Dec 2014
Volume 63, Issue 11 - Nov 2014
Volume 63, Issue 10 - Oct 2014
Volume 63, Issue 9 - Sep 2014
Volume 63, Issue 8 - Aug 2014
Volume 63, Issue 7 - Jul 2014
Volume 63, Issue 6 - Jun 2014
Volume 63, Issue 5 - May 2014
Volume 63, Issue 4 - Apr 2014
Volume 63, Issue 3 - Mar 2014
Volume 63, Issue 2 - Feb 2014
Volume 63, Issue 1 - Jan 2014
Selecting the target year
Analysis of Effect on Lightning Surge according to the Grounding Condition of Overhead Ground Wire in Distribution System
Han, Joon ; Kim, Chul-Hwan ; Seo, Hun-Chul ; Choi, Sun-Kyu ; Lee, Byung-Sung ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 3, 2014, Pages 331~337
DOI : 10.5370/KIEE.2014.63.3.331
The Korean distribution system consists of overhead ground wire (OHGW), phase conductors and neutral wire. Especially, OHGW is installed over the phase conductors to protect distribution system from the lightning surge. The flashover rate and the magnitude of lightning overvoltage on distribution system can be affected by grounding condition of OHGW such as grounding resistance and grounding interval. In this paper, we conduct an analysis of lightning overvoltage and flashover rate according to the grounding condition of OHGW. The distribution system and lightning surge are modeled by using ElectroMagnetic Transient Program (EMTP). Also, the Monte Carlo method is applied to consider random characteristics of lightning, and the flashover rate is calculated based on IEEE std. 1410. The simulations are performed by changing the grounding resistance and interval of OHGW and the simulation results are analyzed.
Effect of Adjustable Speed Pumped Storage Power Generator on the Frequency Control Against the Intermittence of Wind Turbine Output
Park, Min-Su ; Chun, Yeong-Han ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 3, 2014, Pages 338~342
DOI : 10.5370/KIEE.2014.63.3.338
Energy storage is a key issue when integrating large amounts of intermittent and non-dispatchable renewable energy sources into electric power systems. To maintain the instantaneous power balance and to compensate for the influence of power fluctuations from renewable sources, flexible capability for power control is needed. Adjustable Speed Pumped Storage Power Generator is pumped storage unit that is adjustable for pump output adjustments as well as the highest efficiency operations because it has fast response time. In this paper we address the adjustable speed pumped storage power generator for frequency control against the intermittence of wind turbine output and calculate the appropriate capacity of adjustable speed pumped storage power generator.
Implementation and Test of 3-level NPC VSC-HVDC System using Hardware-in-the-Loop Simulation
Yoo, Hyeong-Jun ; Kim, Nam-Dae ; Kim, Hak-Man ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 3, 2014, Pages 343~348
DOI : 10.5370/KIEE.2014.63.3.343
Recently, applications of VSC-HVDC systems to power systems are growing because of their control ability of reactive power. Meanwhile, the hardware-in-the-loop simulation (HILS) based on the real-time digital simulator has been applying to develop and test imbedded controllers and systems in the power industry to decrease costs and to save time. In this paper, a 3-level neutral point clamped (NPC) VSC-HVDC system is modeled and the embedded controllers of the NPC VSC-HVDC system are designed. The designed controllers are implemented by TMS320F28335. The TMS320F28335-based controllers of the NPC VSC-HVDC system are tested using the HILS.
Optimum Design of Axially Laminated Anisotropic Synchronous Reluctance Motor and Comparison of Characteristics with Induction Motor
Lee, Pil-Won ; Byen, Won-Gee ; Lee, Jun-Ho ; Lee, Jung-Ho ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 3, 2014, Pages 349~357
DOI : 10.5370/KIEE.2014.63.3.349
The performance of a Synchronous Reluctance Motor (SynRM) in terms of torque and power factor depends on the two-axis inductances
of the machine. The Axially Laminated Anisotropic (ALA) rotor should be proposed in an effort to increase the
ratio and the
difference to secure high torque density and high power factor. So, ALA rotor is suitable for high speed instruments. This paper deals with optimum design of Axially Laminated Anisotropic Synchronous Reluctance Motor (ALA-SynRM) and comparison of characteristics with induction motor. Coupled Finite Element Methodology (FEM) & Response Surface Methodology (RSM) have been used to evaluate optimum design solutions. Comparisons are given with characteristics of a same rated wattage induction motor and those of ALA-SynRM respectively.
A Quasi Z-Source AC-AC Converter with a Low DC Voltage Distribution Capability Operating as a Power Electronic Transformer
Yoo, Dae-Hyun ; Oum, Jun-Hyun ; Jung, Young-Gook ; Lim, Young-Cheol ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 3, 2014, Pages 358~366
DOI : 10.5370/KIEE.2014.63.3.358
This paper proposes a quasi Z-source AC-AC converter with the low DC voltage distribution capability operating as a power electronic transformer. The proposed system has configuration that the input terminals of two quasi Z-source AC-AC converters are connected in parallel, also their output terminal are connected in series. Simple control method of duty ratio was proposed for the in phase buck-boost AC voltage mode and the DC output voltage control. DSP based experiment and PSIM simulation were performed. As a result, the PSIM simulation results were same with the measured results. By controlling the duty ratio under the condition of 100 [
] load, quasi Z-source AC-AC converter could buck and boost the AC output voltage in phase with the AC input voltage, and the same time, the constant DC voltage could be output without affecting the AC output characteristics. And, the DC output voltage 48[V] was constantly controlled in dynamic state in case while the load is suddenly changed (
). From the above result, we could know that the quasi Z-source AC-AC converter can act as a power electronic transformer with a low DC voltage distribution capability.
Effects of Freshwater Flooding on the Properties of the Accelerated Thermally Aged CSPE
Kang, Myeong-Gyun ; Lee, Jung-Hoon ; Lee, Seung-Hoon ; Jeon, Jun-Soo ; Kim, In-Yong ; Shin, Yong-Deok ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 3, 2014, Pages 367~370
DOI : 10.5370/KIEE.2014.63.3.367
The accelerated thermal aging of a CSPE were carried out for 0, 80.82, 161.63 days at
, which are equal to 0, 40 and 80 years, respectively. The volume electrical resistivities of the non-accelerated thermally aged CSPE and the accelerated thermally aged CSPE for 40y and 80y were
at room temperature, respectively. The dielectric constant of the non-accelerated thermally aged CSPE and the accelerated thermally aged CSPE for 40y and 80y were 3.355~4.030, 2.996~3.963 and 3.020~4.776 at room temperature, respectively. After seawater and freshwater flooding, the volume electrical resistivity of the CSPE trend slightly upward according to drying day at room temperature. After seawater flooding, the dielectric constant of the accelerated thermally aged CSPE were not measured. After seawater flooding, bright open pores of the accelerated thermally aged CSPE were partly transferred to dark close pores due to salinity. After freshwater flooding, dark close pores of the accelerated thermally aged CSPE were partly transferred to bright open pores because salinity of them is decreased. An insulation property of a cable in NPPs was decreased because of the seawater flooding, and an insulation property of them was recovered through the freshwater flooding. As a result, it is considered that an insulation property of a contaminated cable through Tsunami can be recovered if it is cleaned quickly.
The Performance Comparison of Frequency Translators Using RHTL and LHTL Phase Shifters
Han, Heejae ; Park, Hongwoo ; Kim, Hongjoon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 3, 2014, Pages 371~375
DOI : 10.5370/KIEE.2014.63.3.371
In this paper, we compared the performances of the Right Handed Transmission Line (RHTL) and the Left Handed Transmission Line (LHTL) phase shifters as a frequency translator. Unlike other phase shifters, both phase shifters show a
phase variation for a broadband frequency and compact in size which are ideal to use as a frequency translator. For the performance comparison, we fabricated both a RHTL and a LHTL phase shifter to cover 1.5 GHz - 2.4 GHz range with the whole
phase variation. For the frequency range, a LHTL based frequency translator showed a much better performance whose Spurious Free Dynamic Range (SFDR) is 4dB - 17dB higher than the RHTL based frequency translator when the sawtooth modulation freqncy is 11 kHz. This is due to the linear phase-voltage variation of LHTL phase shifter. Furthermore, the LHTL phase shifter shows a less insertion loss and a insertion loss variation than the RHTL phase shifter. Overall, the LHTL based frequency translator outperformed RHTL based freqency translator.
Realtime e-Actuator Fault Detection using Online Parameter Identification Method
Park, Jun-Gi ; Kim, Tae-Ho ; Lee, Heung-Sik ; Park, Chansik ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 3, 2014, Pages 376~382
DOI : 10.5370/KIEE.2014.63.3.376
E-Actuator is an essential part of an eVGT, it receives the command from the main ECU and controls the vane. An e-Actuator failure can cause an abrupt change in engine output and it may induce an accident. Therefore, it is required to detect anomalies in the e-Actuator in real time to prevent accidents. In this paper, an e-Actuator fault detection method using on-line parameter identification is proposed. To implement on-line fault detection algorithm, many constraints are considered. The test input and sampling rate are selected considering the constraints. And new recursive system identification algorithm is proposed which reduces the memory and MCU power dramatically. The relationship between the identified parameters and real elements such as gears, spring and motor are derived. The fault detection method using the relationship is proposed. The experiments with the real broken gears show the effectiveness of the proposed algorithm. It is expected that the real time fault detection is possible and it can improve the safety of eVGT system.
Wave Modeling for Low-cost Wave Monitoring System
Lee, Jung-Hyun ; Lee, Dong-Wook ; Heo, Moon-Beom ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 3, 2014, Pages 383~388
DOI : 10.5370/KIEE.2014.63.3.383
This paper describes a wave modeling method using low-cost sensors. Wave modeling is applied to the wave monitoring system for accurate measurement of ocean wave parameters. The observation of ocean wave parameters is necessary to improve the accuracy of forecast of ocean wave condition. However, the ocean wave parameters measured by a low-cost wave monitoring system suffer from several errors. Therefore we introduce a wave modeling method to compensate the ocean wave parameters corrupted by errors. The proposed method is analyzed using experiments within controlled environment. It is verified that the accuracy of low-cost wave monitoring system can be increased by the proposed method.
Two Evolutionary Gait Generation Methods for Quadruped Robots in Cartesian Coordinates Space and Join Coordinates Space
Seo, Kisung ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 3, 2014, Pages 389~394
DOI : 10.5370/KIEE.2014.63.3.389
Two evolutionary gait generation methods for Cartesian and Joint coordinates space are compared to develop a fast locomotion for quadruped robots. GA(Genetic Algorithm) based approaches seek to optimize a pre-selected set of parameters for the locus of paw and initial position in cartesian coordinates space. GP(Genetic Programming) based technique generate few joint trajectories using symbolic regression in joint coordinates space as a form of polynomials. Optimization for two proposed methods are executed using Webots simulation for the quadruped robot which is built by Bioloid. Furthermore, simulation results for two proposed methods are analysed in terms of different coordinate spaces.
Seismic Noise Reduction Using Micro-Site Array Stacking
Choi, Hun ; Sohn, Sang-Wook ; Bae, Hyeon-Deok ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 3, 2014, Pages 395~403
DOI : 10.5370/KIEE.2014.63.3.395
This paper presents a new approach to improve the signal to noise ratio (SNR) for local seismic disaster preventing system in densely populated area. The seismic data measured in the local site includes various sensing noises (offset or measurement noise) and man-made/natural noises (road and rail traffic noise, rotating or hammering machinery noise, human activity noise such as walking and running, wind/atmospheric pressure-generated noise, etc.). These additive noises are different in time and frequency characters. The proposed method uses 3-stages processing to reduce these different additive noises. In the first stage, misalignment offset noise are diminished by time average processing, and then the second and third stages, coherent/incoherent noises such as man-made/natural noises are suppressed by array stacking. In addition, we derived the theoretical equation of the SNR gain improved by the proposed method. To evaluate the performance of the proposed method, computer simulations were performed with real seismic data and test equipment generated data as the input.
The Comparison of Field Uniformity and SAR between TEM, Loop and Combined Elemented 16 Channel Transmit Arrays
Ryu, Yeunchul ; Kim, Young Beom ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 3, 2014, Pages 404~408
DOI : 10.5370/KIEE.2014.63.3.404
In this research we evaluate the excitation homogeneity and SAR of three different Tx arrays after B1+ Shimming in the human body at 3T. Through the simulations, we compared the field properties that are standard deviation and mean value of transverse magnetization for 1) strip line TEM array, 2) rectangular loop array, 3) combined array of strip line element and rectangular loop and shown the utilities of B1+ shimming in human body model. After B1+ shimming, it is evaluated four different types of SAR for body mesh through whole body simulation; those are average, maximum 1-cell, maximum 1-gram, and maximum 10-gram SAR. It appears that in this particular comparison an array based on strip line elements can produce better homogeneity and lower SAR than an array of rectangular loops or an array of combined elements (strip line and loop). While many factors are considered in designing coils for production, it is hoped that methods and results like these will be used in the future to guide decisions and maximize benefit.
UHF Sensor Location Optimization for Partial Discharge Signals Detection Method
Choi, Mun-Gyu ; Cha, Hanju ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 3, 2014, Pages 409~413
DOI : 10.5370/KIEE.2014.63.3.409
GIS partial discharge that occurred in the UHF band signal is effectively detected by the method to IEC60270 5pc the apparent minimum discharge can be detected over the GIS arrangement of the sensor interior and exterior of the UHF in accordance with the optimized position signal by considering the damping ratio is selected so that the signals can be obtained to be mounted. 362kV, 800kV GIS is installed on the internal and external sensors are UHF band signal attenuation is set by measuring the reference value, but the operation, 170kV case 362kV, 800kV on the basis of the measurement data and to be installed and operated. When 170kV per 1Bay by installing the built-in sensor 1 for detecting a partial discharge signal, But, GIS signal attenuation is large in the case of an internal partial discharge signal is not detected in some cases. Where the attenuation is great UHF signal of the sensor by increasing the quantity of partial discharge signals were acquired to allow relocation. The greater the spacing between the sensor and the sensor is applied simplifies the installation and reduces the cost in terms of maintenance of appropriate optimal position is calculated to detect the partial discharge signal is needed. Thus 170kV GIS signal power attenuation of a partial discharge by measuring the UHF sensor, and by relocating the proper position is calculated in accordance with the sensor signal decay rate and minimize the error of omission in detecting a partial discharge signal was optimized.
Electric Power Characteristics of a SFCL based on Turn-ratio of 3-Phase Transformer
Jeong, In-Sung ; Choi, Hyo-Sang ; Jung, Byung-Ik ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 3, 2014, Pages 414~417
DOI : 10.5370/KIEE.2014.63.3.414
At present, the demand for electric power increases, the electric power system is complicated. The size of the line-to-ground fault and the line-to-line fault occurred with complication of electric power system continue to increase, therefore several issues are raised. To address these issues effectively, the superconducting fault current limiter (SFCL) has been proposed, this study is ongoing. In this paper, we applied the SFCL in three-phase transformer and comparative analysis of the electric power burden to the SFCL. The superconductor is combined to the third winding of transformers in connection structure. In case of a third line-to-line fault, we did comparative analysis of the electric power burden to the SFCL based on the turn ratio of transformer third winding. In this case, we could confirm as the third turn ratio increased, electric power impressed to the superconducting element increased.
A Development of the Fault Detection System of Wire Rope using Magnetic Flux Leakage Inspection Method and Noise Filter
Lee, Young Jin ; A, Mi Na ; Lee, Kwon Soon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 3, 2014, Pages 418~424
DOI : 10.5370/KIEE.2014.63.3.418
A large number of wire rope has been used in various industries such as cranes and elevators. When wire used for a long time, wire defects occur such as disconnection and wear. It leads to an accident and damage to life and property. To prevent this accident, we proposed a wire rope fault detection system in this paper. We constructed the whole system choosing the leakage fault detection method using hall sensors and the method is simple and easy maintenance characteristics. Fault diagnosis and analysis were available through analog filter and amplification process. The amplified signal is transmitted to the computer through the data acquisition system. This signal could be obtained improved results through the digital filter process.
Design Technique of a Permanent Magnet High-speed Motor for Improving Power Density and Efficiency
Lee, Ki-Doek ; Lee, Ju ; Lee, Hyung-Woo ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 3, 2014, Pages 425~430
DOI : 10.5370/KIEE.2014.63.3.425
This paper presents a design technique to improve the power density and efficiency of a permanent magnet high-speed motor by using the mono-PM rotor. The suggested model minimized rotor diameter and stack length which have a bad influence on shafting in the high-speed operation. Conventional and suggested motors are analyzed and compared by using FEM(Finite Element Method) to verify the effectiveness. The overall performance such as torque, losses, efficiency and power density and so on are investigated in detail. The results of the analysis deduced that the suggested mono-PM rotor design is superior to the conventional one.
Thermal Characteristic Analysis of IPMSM for Traction Considering a Driving Pattern of Urban Railway Vehicles
Park, Chan-Bae ; Kim, Jae-Hee ; Lee, Su-Gil ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 3, 2014, Pages 431~436
DOI : 10.5370/KIEE.2014.63.3.431
In this paper, temperature change properties on the 210kW-class Interior Permanent Magnet Synchronous Motor (IPMSM) are performed with the cooling performance of a water cooling device through the thermal characteristic analysis of the IPMSM considering a real driving pattern of urban railway vehicles. First, the thermal analysis modeling of 210kW-class IPMSM, which is an alternative to the conventional induction motor, and its water cooling device is conducted. Next, the thermal characteristic analysis of the IPMSM considering a real driving pattern of urban railway vehicles is performed using 2-Dimensional FEM tool. Finally, the calculated characteristic results are analyzed. Consequently, it is confirmed that the internal temperature of the 210kW-class IPMSM may be lowered to about 42~52% by maintaining the coolant flow rate of the water cooling device (Cross sectional shape of the pipe has 220mm width and 10mm height) for 0.2kg/s level.
A Study on the International Standard and Regulation for Electric Motor and Drives
Woo, Kyung-Il ; Park, Han-Seok ; Kim, Dea-Kyong ; Choi, Han-Seok ; Jun, Hee-Deuk ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 3, 2014, Pages 437~443
DOI : 10.5370/KIEE.2014.63.3.437
Electric motors and drives consume the largest amount of electricity more than 40% of global electricity consumption. In addition, motors, drives and its components are included in the global high-trade products and the main driving source for industrial equipment and house appliances. Thus, International standards and regulations for their safety and efficiency are internationally being discussed and created for the protection of its citizens and energy saving. So, understanding the international standards and the regulation of each country is essential to enhance overseas market and to develop product. In this paper, on the basis of this background, status and trends of international standards and regulations are introduced for safety and efficiency of motors and the drives. Safety and efficiency of the IEC (International Electrotechical Commission) standards are introduced in the emphasis. Also, regulations are studied about the differences and trends in each county.