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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
A Study on Load Control Method for Home Energy Management System (H-EMS) Considering the Human Comfort
Jeon, Jeong-Pyo ; Kim, Kwang-Ho ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 8, 2014, Pages 1025~1032
DOI : 10.5370/KIEE.2014.63.8.1025
The effective energy management method will provide the significant advantage to the residential customers under real time pricing plan since it can reduce the electricity charge by controlling the energy consumption according to electricity rate. The earlier studies for load management mainly aim to minimize the electricity charges and peak power but put a less emphasis on the human comfort dwelling in the residence. The discomfort and displeasure from the energy management only focusing on reduction of electricity charge will make the residential customer reluctant to enroll the real time pricing plan. In this paper, therefore, we propose optimal load control strategy which aim to achieve not only minimizing the electricity charges but also maintaining human comfort by introducing "the human comfort coefficient." Using the human comfort coefficient, the energy management system can reflect the various human personality and control the loads within the range that the human comfort is maintained. Simulation results show that proposed load control strategy leads to significant reduction in the electricity charges and peak power in comparison with the conventional load management method.
Battery Charge and Discharge Optimization for Vehicle-to-grid Regulation Service
Kim, Wook-Won ; Shin, Hong-Yul ; Kim, Jin-O ; Kim, Kyu-Ho ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 8, 2014, Pages 1033~1038
DOI : 10.5370/KIEE.2014.63.8.1033
Electric vehicles should be connected to power system for charge and discharge of battery. Besides vehicle`s battery is charged for a power source, it is also reversibly possible to provide power source from battery to power system. Researches on battery usage for regulation resources have been progressed and could cause cost increase excessively because they distribute regulation capacity equally without considering the battery wear cost of SOC, temperature, voltage and so on. This causes increase of grid maintenance cost and aggravate economical efficiency. In this paper it is studied that the cost could be minimized according to the battery condition and characteristic. The equation is developed in this paper to calculate the possible number of charge and discharge cycle, according to SOC level and weighting factors representing the relation between battery life and temperature as well as voltage. Thereafter, the correlation is inferred between the battery condition and wear cost reflecting the battery price, and the expense of compensation is decided according to the condition on battery wear-out of vehicle. In addition, using realtime error between load and load expectation, it is calculated how much regulation capacity should be provided.
Measurement of Magnetostriction Characteristics of Electrical Steel Sheet using Three-axial Strain Gauge and Vector Single Sheet Tester
Park, Chan-Hyuk ; Cho, Hyun-Jin ; Yoon, Hee-Sung ; Ha, Jung-Woo ; Kim, Joong-Kyoung ; Koh, Chang-Seop ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 8, 2014, Pages 1039~1045
DOI : 10.5370/KIEE.2014.63.8.1039
Acoustic noise from a transformer, recently, has drawing more and more attentions. One of the main source of the noise is thought to be magnetostriction of the electrical steel sheets which compose transformer core. This paper deals with the magnetostriction of a highly grain-oriented electrical steel sheet measured by using a vector single sheet tester and a three-axial strain gauge. The results show that direction and axis ratio as well as the magnitude of the applied magnetic flux density contribute much to magnetostriction.
Redundancy Module Operation Analysis of MMC using Scaled Hardware Model
Yoo, Seung-Hwan ; Shin, Eun-Suk ; Choi, Jong-Yun ; Han, Byung-Moon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 8, 2014, Pages 1046~1054
DOI : 10.5370/KIEE.2014.63.8.1046
In this paper, a hardware prototype for the 10kVA 11-level MMC was built and various experimental works were conducted to verify the operation algorithms of MMC. The hardware prototype was designed using computer simulation with PSCAD/EMTDC software. After manufactured in the lab, the hardware prototype was tested to verify the modulation algorithms to form the output voltage, the balancing algorithm to equalize the sub-module capacitor voltage, and the redundancy operation algorithm to improve the system reliability. The developed hardware prototype can be utilized for analyzing the basic operation and performance improvement of MMC according to the modulation and redundancy operation scheme. It also can be utilize to analyze the basic operational characteristics of HVDC system based on MMC.
Power Loss Analysis of EV Fast Charger with Wide Charging Voltage Range for High Efficiency Operation
Kim, Dae Joong ; Park, Jin-Hyuk ; Lee, Kyo-Beum ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 8, 2014, Pages 1055~1063
DOI : 10.5370/KIEE.2014.63.8.1055
Power losses of a 1-stage DC-DC converter and 2-stage DC-DC converter are compared in this paper. A phase-shift full-bridge DC-DC converter is considered as 1-stage topology. This topology has disadvantages in the stress of rectifier diodes because of the resonance between the leakage inductor of the transformer and the junction capacitor of the rectifier diode. 2-stage topology is composed of an LLC resonant full-bridge DC-DC converter and buck converter. The LLC resonant full-bridge DC-DC converter does not need an RC snubber circuit of the rectifier diode. However, there is the drawback that the switching loss of the buck converter is large due to the hard switching operation. To reduce the switching loss of the buck converter, SiC MOSFET is used. This paper analyzes and compares power losses of two topologies considering temperature condition. The validity of the power loss analysis and calculation is verified by a PSIM simulation model.
Study on the Design of Operation Scenario for Replacement of a Railway Signaling System
Jeong, Rag-Gyo ; Kim, Baek-Hyun ; Kang, Seok-Won ; Kho, Young-Hwan ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 8, 2014, Pages 1064~1069
DOI : 10.5370/KIEE.2014.63.8.1064
The railway signalling system plays an essential role in the headway and routing control for a safe and efficient train operation. The reliable and safe operation of the system is very important because the failure of the railway signalling system can lead to the collision, derailment, or unexpected stop of a train. So far, the conventional wayside signal mode (ATS: Automatic Train Stop) has been generally used as the railway signalling system. However, this system is highly linked to a risk of major accidents resulted from human mistakes such as missing a signal or careless control of train speed. Accordingly, the onboard signal mode (ATC: Automatic Train Control) as an alternative of ATS has been recently introduced and applied to transmit effectively the information on speed control of a train by using computers and communication equipment. In the process of replacing the obsolete signal system, it is necessary to switch over the system while providing passengers with normal services. Therefore, the integration of a railway signaling system compatible for both ATS and ATC and its interface is discussed in this study. In particular, the implementation scenario required for operation planning of the integrated system was designed, and the results as well as effects of its applicability test were also presented.
Design of very fast acting fuse element using the Ag-Cu alloy
Kim, Eun-Min ; Lee, Seung-Hwan ; Cho, Dae-Kweon ; Kim, Shin-Hyo ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 8, 2014, Pages 1070~1074
DOI : 10.5370/KIEE.2014.63.8.1070
With the development of the electronics industry and widespread supply of many different electrical appliances, the factors of the electrical fires are also diversified. For this reason, the fuse, safety-critical component, needs accurate and stable operating characteristics for preventing various fire factor, and also needs various operating characteristics. Especially when the all electrical resistance are dropped by internal short of circuit, high current inrushes and makes the fire. In order to prevent this, very fast acting fuses should be applied. However, existing very fast acting characteristics fuse has less wire dimension of element Ag100% metal than that of fast acting fuse, and it is made of plating with low melting point metals, so it satisfy very fast acting but it can`t satisfy durability and safety. For this reason, in this study, through the analyzing fusing characteristics of Ag-Cu alloy composition, the new alloy composition, which implement to very fast acting fuse without decrease of fuse elements dimension, is suggested. And this study classify the operating characteristics changes, a resistance change, and the rated current of the fuse in the overall composition change of Ag-Cu alloying. and it can be utilized for designing fuse.
A Study on the G-Sensitivity Error of MEMS Vibratory Gyroscopes
Park, Byung-Su ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 8, 2014, Pages 1075~1079
DOI : 10.5370/KIEE.2014.63.8.1075
In this paper, we describe the analysis and the compensation method of the g-sensitivity error for MEMS vibratory gyroscopes. Usually, the g-sensitivity error has been ignored in the commercial MEMS gyroscope, but it deserves our attention to apply for the missile application as a tactical grade performance. Thus, it is necessary to compensate for the g-sensitivity error to reach a tactical grade performance. Generally, the g-sensitivity error seems intuitively to be a gyroscope bias error proportional to the linear acceleration. However, we assert that the g-sensitivity error mainly causes not a bias error but a scale-factor error. And we verify that the g-sensitivity scale-factor error occurs due to the non-linearity of parallel plate electrodes. Therefore, we propose the compensation method to remove the g-sensitivity scale-factor error. The experimental result showed that a proposed compensation method improved successfully the performance of the MEMS vibratory gyroscope.
Consensus-Based Formation Tracking of Fuzzy Multi-Agent Systems
Moon, Ji Hyun ; Jee, Sung Chul ; Lee, Ho Jae ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 8, 2014, Pages 1080~1084
DOI : 10.5370/KIEE.2014.63.8.1080
This paper addresses a design technique for formation tracking controllers of discrete-time Takagi-Sugeno fuzzy multi-agent systems based on consensus. The interconnection topology among the agents is expressed as a digraph. The design condition is represented in terms of linear matrix inequalities. Numerical example demonstrates the effectiveness of the proposed method.
Estimation of State-of-charge and Sensor Fault Detection of a Lithium-ion Battery in Electric Vehicles
Han, Man-You ; Lee, Kee-Sang ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 8, 2014, Pages 1085~1091
DOI : 10.5370/KIEE.2014.63.8.1085
A model based SOC estimation scheme using parameter identification is described and applied to a Lithium-ion battery module that can be installed in electric vehicles. Simulation studies are performed to verify the effect of sensor faults on the SOC estimation results for terminal voltage sensor and load current sensor. The sensor faults should be detected and isolated as soon as possible because the SOC estimation error due to any sensor fault seriously affects the overall performance of the BMS. A new fault detection and isolation(FDI) scheme by which the fault of terminal voltage sensor and load current sensor can be detected and isolated is proposed to improve the reliability of the BMS. The proposed FDI scheme utilizes the parameter estimation of an input-output model and two fuzzy predictors for residual generation; one for terminal voltage and the other for load current. Recently developed dual polarization(DP) model is taken to develope and evaluate the performance of the proposed FDI scheme. Simulation results show the practical feasibility of the proposed FDI scheme.
Grid-based Output Control for Wind Farm Using PSO
Moon, Il Kwon ; Joo, Young Hoon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 8, 2014, Pages 1092~1097
DOI : 10.5370/KIEE.2014.63.8.1092
In this paper, we propose the grid-based output control method for wind farm. To do this, we propose the output control method using the PSO(Particle Swarm Optimization) algorithm. Secondly, we propose the method for detecting the harmonics using STFT(Short-Time Fourier Transform) algorithm. And last, we propose the method for compensating the harmonics using neural network. Finally, we show the effectiveness and feasibility of the proposed method though some simulations.
Development of Intelligent Electrofusion Welding Machine with Real-time Recognition of Conductive Plastic Heater Characteristics
Kim, Dae Young ; Yi, Keon Young ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 8, 2014, Pages 1098~1103
DOI : 10.5370/KIEE.2014.63.8.1098
This study deals with the development of an electrofusion welding machine that is capable of joining plastic pipes using a recently developed electrofusion fitting. This fitting has built-in conductive plastics that are used to weld the joint together as a heating element. In order to explain the mechanism of the new machine, 1) the resistance characteristics of the heating element were explained, 2) the method of electric welding that uses the electrofusion fitting was described, and 3) the method of power supply based on controlling the firing angle was explained. A control system for an intelligent electrofusion welding machine was proposed. This system has the ability to recognize the diameter of an electrofusion fitting using a lookup-table based on the difference of resistance curves according to fitting types, and it is able to weld the fittings regardless of the ambient temperature. A new algorithm was developed to control the power of electric welding through the recognition of feature points from the resistance curve of the heating element. In order to evaluate the performance of the developed welding machine, tests involving the welding of 16 mm- and 20 mm-type fittings were carried out. Examining the welding results, we concluded that the proposed welding machine will offer high productivity and reliability in the field of electrofusion welding.
Three-dimensional Navigation Error for Landmarks` Geometry in Landmark-based Vision Navigation Systems
Kim, Youngsun ; Hwang, Dong-Hwan ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 8, 2014, Pages 1104~1110
DOI : 10.5370/KIEE.2014.63.8.1104
This paper investigates geometric effect of landmarks on three-dimensional navigation error in landmark-based vision navigation systems. Dilution of precision is derived for landmark measurement error on the focal plane of the camera and separately expressed in position DOP and attitude DOP. Values of DOP are observed for various configurations of landmarks.
A Study on Demand-Side Resource Management Based on Big Data System
Yoon, Jae-Weon ; Lee, Ingyu ; Choi, Jung-In ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 8, 2014, Pages 1111~1115
DOI : 10.5370/KIEE.2014.63.8.1111
With the increasing interest of a demand side management using a Smart Grid infrastructure, the demand resources and energy usage data management becomes an important factor in energy industry. In addition, with the help of Advanced Measuring Infrastructure(AMI), energy usage data becomes a Big Data System. Therefore, it becomes difficult to store and manage the demand resources big data using a traditional relational database management system. Furthermore, not many researches have been done to analyze the big energy data collected using AMI. In this paper, we are proposing a Hadoop based Big Data system to manage the demand resources energy data and we will also show how the demand side management systems can be used to improve energy efficiency.
Development of Automated Demand Response Platform Using Open Source Code
Yoon, Jae-Weon ; Lee, Ingyu ; Choi, Jung-In ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 8, 2014, Pages 1116~1120
DOI : 10.5370/KIEE.2014.63.8.1116
With the shift of the energy paradigm from supply side management to demand side management, demand resource management and demand response plays an important role in the energy industry. As a consequency, a lot of researches have been done to provide a suitable demand response system. However, most of the demand response systems are based on the propriety products that cannot be modified. In this paper, we are proposing an automated demand response system using an EnerNOC provided open source code. We implemented the demand response server (VTN) and demand response client (VEN), and validated the OpenADR2.0 compliances using the open source code. We also used an Arduino microcontoller to demonstrate the communication schemes to control various devices.
An Optical Technique for Concentration Measurement by Color Analysis
Lee, Tae-Hee ; Kim, Ji-Sun ; Jung, Gu-In ; Choi, Ju-Hyeon ; Oh, Han-Byeol ; Kim, A-Hee ; Jung, Hyon-Chel ; Cho, Yeong Bin ; Jun, Jae-Hoon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 8, 2014, Pages 1121~1127
DOI : 10.5370/KIEE.2014.63.8.1121
Many studies have been done to measure and analyze color for various purposes. Visual assessment has lack of objectivity and the equipment for color measurement is very expensive. In this study, we developed a device for quantitative analysis of the color using optical elements. With the color sensor, the ratio of RGB was calculated by measuring the light intensity that is reflected from an object. Inverse transformation of optical signal was performed to detect the color density. The suggested color analyzer can detect color information as well as sample concentration. Results of this study are expected to be used in various medical fields such as pH indicator and urine analysis.
Optimal Signal Segment Length for Modified Run-test and RA(reverse arrangement)-test for Assessing Surface EMG Signal Stationarity
Lee, Jin ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 8, 2014, Pages 1128~1133
DOI : 10.5370/KIEE.2014.63.8.1128
Most of the statistical signal analysis processed in the time domain and the frequency domain are based on the assumption that the signal is weakly stationary(wide sense stationary). Therefore, it is necessary to know whether the surface EMG signals processed in the statistical basis satisfy the condition of the weak stationarity. The purpose of this study is to find optimal segment length of surface EMG signal for assessing stationarity with the modified Run-test and RA-test. Ten stationary surface EMG signals were simulated by AR(autoregressive) modeling, and ten real surface EMG signals were recorded from biceps brachii muscle and then modified to have non-stationary structures. In condition of varying segment length from 20ms to 100ms, stationarity of the signals was tested by using six different methods of modified Run-test and RA-test. The results indicate that the optimal segment length for the surface EMG is 30ms~35ms, and the best way for assessing surface EMG signal stationarity is the modified Run-test (Run2) method using this optimal length.
A Study of Design factors for Increasing Energy Production in Small Hydro power with Using Long Pipe
Kim, Hyun-Han ; Kim, Kwang-Ho ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 8, 2014, Pages 1134~1139
DOI : 10.5370/KIEE.2014.63.8.1134
Recently the need for renewable energy development is expanding due to the global climate change, the environmental issues and the limited fossil energy resources. Dependence of energy on overseas is high in Korea. To resolve the environmental problems and to improve the energy independence rate, the development of renewable energy is more required. The small hydro power, one of the renewable energy resources, has been developing and operating from a long time ago. If we are new developing a small hydro power with the use existing dams and reservoirs, we will design the length of inlet pipe and the diameter suitable for it. However, in case of using the existing water supply pipe which had been designed suitable for water service, the designer has to review and check that the pipe is suitable for operating a generator. In this paper, the design of small hydro power using the existing long pipe of water supply, we suggest the optimum way to reduce the water hammer in pipe which causes the unsteady flow during the load-shutdown of generator, the generator operation plan for the stable supply of water and the design factor of determining the generator capacity through the analysis between discharge and head-loss.
Tunnel Lighting Control System using Fuzzy Reasoning
Lee, Jung-Eun ; Choi, Hong-Kyoo ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 8, 2014, Pages 1140~1145
DOI : 10.5370/KIEE.2014.63.8.1140
Tunnel lighting is composed of entrance zone, interior zone and exit zone by KS C 3703. We have to consider adaptation at entrance zone and exit zone lighting to prevent deteriorate visibility like black hole and white hole phenomenon. So External luminance, vehicle velocity and traffic volume should be considered in threshold zone lighting and vehicle speed and traffic volume should be considered in interior zone lighting. But existing tunnel lighting system is not good at visibility and economic because that is only controled by external luminance. So in this paper, We improve visibility and economic of tunnel lighting system using fuzzy reasoning according to external luminance, vehicle velocity, traffic volume.
A Study on Endurance Improvement of Electrical Equipment according to Vibration Environment
Park, Keun-Seok ; Shim, Jae-Myung ; Lee, Dae-Dong ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 8, 2014, Pages 1146~1151
DOI : 10.5370/KIEE.2014.63.8.1146
The equipment in ships and railway vehicles are continuously exposed to vibration, and its durability is very important. Therefore, consumers require the verification of the performance of equipment via standardized tests under the given environments to improve and stabilize the performance. In this study, a durability improvement and stabilization plan was proposed, which included the exploratory vibration test, variable frequency test and endurance test for the electrical equipment according to the vibration environment. It is expected that this study results will improve the technological competitive power of the ship and railway-related manufacturers and contribute to the equipment development and export.
A Study on the Risk Assessment for Oil Immersed Transformer of Subway with FN curve
Choi, Seung Hyeok ; Lee, Jong Woo ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 8, 2014, Pages 1152~1158
DOI : 10.5370/KIEE.2014.63.8.1152
In Modern society, various important systems is operated such as nuclear plant, chemistry industry, railway system and so on. But these systems can cause high risky accidents. Hence, these systems are required to ensure the individual and societal risk criteria. In this paper, we reviewed EU risk criteria which is already operated in UK and Netherlands, then we proposed acceptable risk criteria and estimated risk of oil immersed transformer for subway with FN curve.
Efficiency Improvement Effect Analysis for Marginal Storage Capacity in DC Electric Railway Systems
Lee, Hansang ; Yoon, Donghee ; Kim, Hyungchul ; Joo, Sung-Kwan ; Jung, Hosung ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 8, 2014, Pages 1159~1163
DOI : 10.5370/KIEE.2014.63.8.1159
This paper have been dealt with the analysis for energy efficiency improvement effect of unity storage capacity as a part of the energy storage application study to improve energy efficiency in the electric railway systems. Especially, in order to estimate the amount of energy saving according to the variation of power capacity of each storage, the current limit module was mounted on an existing DC electric railway loadflow program which is based on the analysis model for railway system and storages, and combined optimization algorithm to determine optimal voltage boundary.
Characteristic Analysis of Superconducting LSM for the Wheel-rail-guided Very High Speed Train according to Winding Method of the Ground 3-phase Coils
Park, Chan-Bae ; Lee, Byung-Song ; Lee, Chang-Young ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 8, 2014, Pages 1164~1169
DOI : 10.5370/KIEE.2014.63.8.1164
Recently, an interest in a hybrid system combining only the merits of the conventional wheel-rail system and Maglev propulsion system is growing as an alternative to high-speed maglev train. This hybrid-type system is based on wheel-rail method, but it enables to overcome the speed limitation by adhesion because it is operated by a non-contact method using a linear motor as a propulsion system and reduce the overall construction costs by its compatibility with the conventional railway systems. Therefore, the design and characteristic analysis of a coreless-type superconducting Linear Synchronous Motor (LSM) for 600km/h very high speed railway system are conducted in this paper. The designed coreless-type superconducting LSMs are the distributed winding model, the concentrated 1 layer winding model and the concentrated 2 layer winding model, respectively. In addition, the characteristic comparison studies on each LSM are conducted.