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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 P
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Journal DOI :
The Korean Institute of Electrical Engineers
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Volume & Issues
Volume 60, Issue 4 - Dec 2011
Volume 60, Issue 3 - Sep 2011
Volume 60, Issue 2 - Jun 2011
Volume 60, Issue 1 - Mar 2011
Selecting the target year
Design of K-band Array Antenna for Satellite Communications
Lee, Hyeon-Jin ; Kim, Hyun-Chul ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 60, issue 4, 2011, Pages 167~171
DOI : 10.5370/KIEEP.2011.60.4.167
In this paper,
microstrip patch antenna are proposed to implement K-band satellite communications. The microstrip feed line are inset into the radiation patch to match input impedance. Also the same current in each elements are excited by Kirchhoff's low. The elements distance of proposed array antenna are optimized
to minimize a mutual coupling and maximize a gain. A power divider network are employed to distribute T-junction divider. As result, the proposed antenna get gain of 14[dBi] at 10.525[GHz].
BLDC Motors for Robot Vacuum Cleaners
Kim, Hyun-Jung ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 60, issue 4, 2011, Pages 172~174
DOI : 10.5370/KIEEP.2011.60.4.172
This paper is presented for robot vacuum cleaners using BLDC motors. Recently, BLDC motors which require smaller size, lower sound noise and higher efficiency have been placed in high value-added products including robot vacuum cleaners, vehicle cars and other industry applications. The DC motors have higher sound noise, higher height of the size and lower efficiency due to electro-magnetic structure using the brushes and the commutators. The proposed BLDC motors are appropriate for the motors adequate in regards to higher efficiency, longer life cycle time, and smaller height of the size when robot vacuum cleaners go to some lower height of the space like under sleeping beds and because it's power source is batteries. The paper shows the performance of the BLDC motors designed by the Finite Element Analysis(FEA) of the electro-magnetic field. This paper shows the mechanical structure and the prototype of the motor with the impeller. The performance characteristics of the BLDC motors with the hall sensor controller are verified by the experimental results.
Over-Excitation Protection Relaying using the 345kV Power System Modeling Data
Park, Chul-Won ; Ban, Yu-Hyeon ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 60, issue 4, 2011, Pages 175~180
DOI : 10.5370/KIEEP.2011.60.4.175
A large AC generator is an important component of the power system. It is a need for research of AC generator protection relay for the next-generation ECMS and an efficient operation of protection control system. However, most of protection and control systems used in power plants have been still imported as turn-key and operated in domestic. This may cause the lack of the correct understanding on the protection systems and methods, and thus have difficulties in optimal operation. In this paper, over-excitation protection relaying is one of the protective factors in generator protection IED was presented. The cause and protection principles were dealt and, DFT-based gain compensation algorithm was adopted for the frequency measurement. The Republic of Korea 345kV modeling data by EMTP-RV was used for performance evaluation.
Development of Current Harmonics Estimation Method by Considering the Characteristics of Input Voltage
Ji, Pyeong-Shik ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 60, issue 4, 2011, Pages 181~185
DOI : 10.5370/KIEEP.2011.60.4.181
Due to the increasing of nonlinear loads such as converters and inverters connected to the electric power distribution system, and extensive application of harmonic generation sources with power electronic devices, disturbance of the electric power system and its influences on industries have been continuously increasing. Thus, it is difficult to construct accurate load model for active and reactive power in environments with harmonics. In this research, we develop current harmonics estimation method based on Extreme Learning Machine (ELM) with fast learning procedure for residential loads. Using data sets acquired from various residential loads, the proposed method has been intensively tested. As the experimental results, we confirm that the proposed method makes it possible to effective estimate current harmonics for various input voltage.
Estimation Method of Variable Composition Rate and Error Compensation Method of Aggregative Model for Reactive Power by Variable Composition Rate
Lee, Dae-Jong ; Lee, Jong-Pil ; Lim, Jae-Yoon ; Ji, Pyeong-Shik ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 60, issue 4, 2011, Pages 186~192
DOI : 10.5370/KIEEP.2011.60.4.186
Recently, due to the expansion of electric power demands, nonlinear load such as converters and inverters connected to the electric power distribution system, and extensive application of harmonic generation sources with power electric devices, disturbance of the electric power system and its influences on industries have been continuously increasing. In this research, we develop a novel aggregation algorithm by considering the harmonics characteristics for residential loads. Using data sets acquired from various experiments, we analyzed load characteristics according to harmonics and presented the results obtained the proposed method.
Investigation of the IPMSM Parameter Variation Effect to the System Operation Characteristics of the Multi Inverter Driven High Speed Train System
Park, Dong-Kyu ; Jin, Kang-Hwan ; Chang, Chin-Young ; Kim, Sung-Je ; Kim, Yoon-Ho ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 60, issue 4, 2011, Pages 193~199
DOI : 10.5370/KIEEP.2011.60.4.193
The next generation domestic high speed railway system is a power distributed type and uses vector control method for motor speed control. Nowadays, inverter driven induction motor system is widely used. However, recently PMSM drives are deeply considered as a alternative candidate instead of an induction motor driven system due to their advantages in efficiency, noise reduction and maintenance. The next-generation high-speed train is composed of 2 converter units, 4 inverter units, and 4 Traction Motor units. Each motor is connected to the inverter directly. In this paper, the effects of IPMSM parameter variation to the system operation characteristics of the multi inverter driven high speed train system are investigated. The parallel connected inverter input-output characteristics are analyzed to the parameter mismatches of the IPMSM in 1C1M control using Matlab/Simulink, then the reliability of the simulation results are verified through experimental results.
Performance Analysis of Angle Time Transmit Diversity in Urban Area
Park, Byeong-Hoon ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 60, issue 4, 2011, Pages 200~205
DOI : 10.5370/KIEEP.2011.60.4.200
In multipath fading channel, diversity is essential to mitigate the impairments. In this paper, we have proposed the angle diversity scheme called ATTD(Angle Time Transmit Diversity) instead of Alamouti's STTD(Space Time Transmit Diversity) and have analyzed the performance of the proposed scheme when signal powers caused by the transmission to different angles are different. Based on it, we have measured the wireless vector-channel in the urban area, which has lots of high-story buildings, using the data collected from the 8 by 4 smart array antenna system that we made. According to the measured data, the received signals from different angles have different signal powers. Our performance analysis results show that the proposed scheme has better performance than the space diversity scheme when the received path signal power is at least -7dB compare to the strongest path signal power.
Development of a Remote Inspection Method and Device for Line Sleeves on Transmission Line
Lee, Jae-Kyung ; Jung, Nam-Joon ; Kim, Ho-Ki ; Kim, Kyeong-Ho ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 60, issue 4, 2011, Pages 206~213
DOI : 10.5370/KIEEP.2011.60.4.206
Line sleeves, which used to connect ACSR cables when transmission lines were constructing, sometimes cause power transmission failure due to deterioration and corrosion. Therefore, power transmission line should be inspected regularly to prevent national disaster. Current inspection tool detects insertion length of transmission line on line sleeves, the inspection tool includes enormous error by operator. Moreover, the system is not controlled remotely, negligent accident would be caused while inspecting. To deal with those problems, KEPCO reviewed several ways to inspect line sleeves and proposes new method to inspect line sleeve by measuring magnetic flex which penetrate junction of steel and aluminum sleeve. The developed inspection tool is reliable enough to detect eccentric sleeves. Also, the developed inspection device was applied on actual transmission line and verified its effectiveness.
Measurement and Analysis of the Dangerous Voltage Around Grounding Electrode for Safety in Substation Ground
Son, Seok-Geum ; Kim, Jae-Chul ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 60, issue 4, 2011, Pages 214~219
DOI : 10.5370/KIEEP.2011.60.4.214
The substation grounding design,"IEEE Guide for Safety in AC Substation Grounding (ANSI / IEEE Std 80)"has been widely used. Substation grounding design and substation grounding resistance of grounding network site to predict the voltage at the risk of a very important task, which is a ground fault current due to the influx of the ground network and due to rise in the Earth's potential can be applied to human dangerous Voltage within safe tolerances be configured to be the ground because the network. IEEE Std. 80 for the substation construction safety equipment on the ground securing the ground electrode and the mesh around the boundary potential distribution in terms of risk analysis by the touch voltage and the reference was to clean up the definition and the basic steps of the voltage of the voltage limits the risk of peripheral grounding electrode Suppression by the simulator through a new secure from dangerous voltage design techniques were presented.
Characteristic Analysis of Capacitor Run Single-Phase Induction Motor by Equivalent Circuit Method
Jwa, Chong-Keun ; Kim, Ho-Min ; Kim, Do-Jin ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 60, issue 4, 2011, Pages 220~226
DOI : 10.5370/KIEEP.2011.60.4.220
This paper proposes a straightforward method of analyzing the operation characteristics for the capacitor run single-phase induction motor from the traditional equivalent circuit based on the revolving field theory. The proposed method consists of five procedures as follows: mechanical loss segregation, iron loss segregation and calculation of the equivalent circuit parameters, recalculation of parameters of the main winding side, calculation of the auxiliary winding magnetizing reactance and effective turn ratio, and analyzing the operation characteristics for this motor. When the characteristics are analyzed, the segregated mechanical and iron losses are considered as a loss resistance across input terminals of the equivalent circuit for the analysis. The validity of the proposed method is verified from the comparison between the computed results and the experimental ones for the operation characteristics.
PMSM Sensorless Control using a General-Purpose Microcontroller
Kang, Bong-Woo ; La, Jae-Du ; Kim, Young-Seok ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 60, issue 4, 2011, Pages 227~235
DOI : 10.5370/KIEEP.2011.60.4.227
This paper describes a PMSM control algorithm for realizing a low-cost motor drive system using a general purpose microcontroller. The proposed sensorless algorithm consists of the current observer and the sensorless scheme based on instantaneous reactive power. Also the control board system is not the high-cost DSP(digital signal processor) system but the general purpose microcontroller and it allows to reduce the unit cost of the motor system. However the clock frequency of the proposed microcontroller is one-fifths for the clock frequency of the DSP. In addition, the switching frequency must be selected as the lower frequency because of complex mathematic modeling of the sensorless algorithm. the low switching frequency augments the noise of the motor and might make accurate speed control impossible. Thus this paper proposes the optimization method to supplement the drawback of the general purpose microcontroller and the usefulness of the proposed method is verified through the experiment.
Estimation of the Energy Saving Potential using Energy Bandwidth Analysis in Manufacturing Plant
Park, Hyung-Joon ; Shon, Jin-Geun ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 60, issue 4, 2011, Pages 236~240
DOI : 10.5370/KIEEP.2011.60.4.236
Currently one of the most importance issues in industrial sector is energy cost and energy efficiency. The manufacturing plants especially have made many efforts to reduce energy cost by implementing maintenances. But in many cases, they are not aware that how much energy could be saved more. If we know the best energy consumption, which signifies energy baseline, we can control the intensity of maintenances. One way to obtain the baseline is using proper statistics from a specific plant, a sector of industry. Energy bandwidth signifies the gap between actual Specific Energy Consumption(SEC) of a certain plant and minimum SEC of the best plant, and estimate energy saving potential(ESP) is a result of bandwidth analysis. We chose a model plant and implemented some maintenance for a year, and then we obtained ESP. Additionally we could determine the decreased amount of carbon emissions from the plant using Carbon Emissions Factor(CEF) by Intergovernmental Panel on Climate Change(IPCC).
A Study on the Algorithm for Interconnection of PV System on Power Distribution System Considering Reliability
Moon, Jong-Fil ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 60, issue 4, 2011, Pages 241~245
DOI : 10.5370/KIEEP.2011.60.4.241
In this paper, when photovoltaic (PV) systems are connected to power distribution system, most effective capacity and connected-point of PV system are presented considering power distribution system reliability. The reliability model of PV system is presented considering the duration of sunshine. Also the model of time-varying load and reliability test system bus2 model are used. To simulate the effects of PV system, various cases are selected; (1) base case which is no connection of PV system to power distribution system when faults are occurred, (2) 3MW case which is 3[MW] connection of PV system (3) 4[MW] case, and (4) 20[MW] case which is 20[MW] connection of PV system to the bus of power distribution system. The capacity limit of connected PV system is settled to 14[MW] for all cases except case 4. The reliability for residential, general, industrial, and educational customer is evaluated.
Newton Method MPPT Control and Soft Switching Converter Simulation for Improving the Efficiency of PV System
Jang, In-Hyeok ; Lee, Kang-Yeon ; Choi, Youn-Ok ; Cho, Geum-Bae ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 60, issue 4, 2011, Pages 246~252
DOI : 10.5370/KIEEP.2011.60.4.246
In this paper proposes the soft-switching boost converter and MPPT control for improving the efficiency of PV system. The proposed converter designed H-bridge auxiliary resonant circuit. By this circuit, all of the switching devices perform the soft switching under the zero voltage and zero current condition. Therefore the periodic switching losses can be decreased at turn on, off. The soft switching boost converter designs for 1.5[kW] solar module of the power conversion. Thus, this soft switching boost converter is simulated by MATLAB simulation using Newton-Method algorithm. As a result, Proposed Soft Switching Converter compared to a typical boost converter switching loss was reduced about 61%. And the overall system efficiency was verified to increase about 3.3%.
LED Driver Design with Power Optimum Control Function
Lee, Seung-Woo ; Shin, Hong-Gyu ; Cho, Seong-Ik ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 60, issue 4, 2011, Pages 253~256
DOI : 10.5370/KIEEP.2011.60.4.253
LEDs have small size, long lifespan, high reliability, low power consumption and high color efficiency. Using such a characteristics, LED Back Light Unit has been studying actively. This paper proposes LED driver to minimize power consumption due to LED forward voltage(
) difference and temperature rising. Compared to conventional LED driver, the proposed driver have excellent stability, brief structure and linear output voltage of DC-DC boost converter. Proposed LED Driver circuit was designed using 0.35um CMOS technology. And its operation was verified through simulation.
The Study on the OLSR(Optimized Link State Routing Protocol) Implementation in the Mobile Ad-hoc Network
Cho, Tae-Kyung ; Lee, Jea-Hee ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 60, issue 4, 2011, Pages 257~261
DOI : 10.5370/KIEEP.2011.60.4.257
In this paper, we research the OLSR(Optimized Link State Routing Protocol) of the mobile ad-hoc network protocols, and design the system implementation based on the Embedded Linux for the Ubiquitous Space construction. We prove the performance of proposed system in the various experiment environments through several scenarios which is about transmitting the image data on the mobile ad-hoc network environment.
Research on the Implementation of the AES-CCM Security Mode in a High Data-Rate Modem
Lee, Hyeon-Seok ; Park, Sung-Kwon ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 60, issue 4, 2011, Pages 262~266
DOI : 10.5370/KIEEP.2011.60.4.262
In high data-rate communication systems, encryption/decryption must be processed in high speed. In this paper, we implement CCM security mode which is the basis of security. Specifically, we combine CCM with AES block encryption algorithm in hardware. With the combination, we can carry out encryption/decryption as well as data transmission/reception simultaneously without reducing data-rate, and we keep low-power consumption with high speed by optimizing CCM block.
Insulation Characteristics and Thermography Diagnosis of Porcelain Insulators for the Distribution Systems
Joung, Jong-Man ; Kim, Dong-Myeong ; Choi, Myung-Ho ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 60, issue 4, 2011, Pages 267~271
DOI : 10.5370/KIEEP.2011.60.4.267
The insulating characteristics and temperature rise behaviors of porcelain suspension insulators were investigated. The testing insulators had used in the distribution systems normally and were sampled. Firstly, leakage current was measured and its impedance was calculated. The leakage current of good insulators is 0.2 mA and its impedance is 66
. The worse insulators have lower impedance and the insulators having below 15
take place flashover at the high frequency voltage flashover test. Secondly, the temperature rise characteristics were analyzed depending on leakage current and its impedance. Surface temperature of insulators was measured for 30 minutes and until its saturation after voltage was applied. The temperature rise of insulators having 15
above the ambient temperature. Lastly, the heating behaviors of 3 insulators in a string was analyzed. Any insulator in the string does not generate heat so far as it has at least one sound insulator. On the other hand, all the insulators in the string are bad if the string have any heating insulator.