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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 64, Issue 12 - Dec 2015
Volume 64, Issue 11 - Nov 2015
Volume 64, Issue 10 - Oct 2015
Volume 64, Issue 9 - Sep 2015
Volume 64, Issue 8 - Aug 2015
Volume 64, Issue 7 - Jul 2015
Volume 64, Issue 6 - Jun 2015
Volume 64, Issue 5 - May 2015
Volume 64, Issue 4 - Apr 2015
Volume 64, Issue 3 - Mar 2015
Volume 64, Issue 2 - Feb 2015
Volume 64, Issue 1 - Jan 2015
Selecting the target year
Realization of Torsional Response based on Multi-mass Modeling of Turbine-Generator Shaft System
Park, Ji-Kyung ; Cho, Gyu-Jung ; Sohn, Seung-Hyun ; Chung, Se-Jin ; Kim, Chul-Hwan ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 2, 2015, Pages 201~207
DOI : 10.5370/KIEE.2015.64.2.201
Turbine-generator torsional response is caused by interaction between electrical transient air-gap torque and mechanical characteristics of turbine-generator shafts. If torsional shaft torque exceeds a certain threshold, the loss of fatigue life may occur and, in the end, it is possible to happen permanent shaft failure. Therefore, it is required to understand the torsional response for reliable operation and protection of turbine-generator shaft system. In this paper, we introduced multi-mass modeling method of turbine-generator shaft system using mechanical-electrical analogy and state-space equation to verify the transient torsional response based on ElectroMagnetic Transient Program (EMTP). These simple realization methods for turbine-generator shaft torsional response could be helpful to understand torsional interaction phenomena and develop the transient torque reduction countermeasures for turbine-generator shaft system.
Optimal Capacity Determination of BESS for Customer using Investment Cost and Electric Cost
Park, Jin-Kyung ; Baek, Young-Sik ; Jeong, Ki-Seok ; Park, Ji-Ho ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 2, 2015, Pages 208~213
DOI : 10.5370/KIEE.2015.64.2.208
This study presents the estimation method for the optimal capacity of BESS(Battery Energy Storage System) in order to reduce the electric charges of common consumer. The daily optimal charge and discharge plan of BESS which satisfies the given constraints is established using linear programming through the change of rated output/rated capacity of the time that shows the electric charges in the highest reduced rate has been selected. There will be a problem to compare only reduced rate because the bigger the rated capacity, the more reduced rate is increased. Therefore, rated output/rated capacity of the time when the reduced amount of electric charges for a year is higher than the investment cost of BESS was selected.
A New Terminology Classification System for the Open Korean Knowledge Dictionary and Reclassification
Hwang, Humor ; Kim, Jung-Hoon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 2, 2015, Pages 214~221
DOI : 10.5370/KIEE.2015.64.2.214
A new classification system with 9 main categories and 56 subcategories for the Open Korean Knowledge Dictionary is proposed. The classification system setup is to prepare for the standard classification system to be used to manage effectively vast of terminologies which were published in the Open Korean Knowledge Dictionary and is meant to enhance the fifteen-year old classification system for the standard korean great dictionary to match up to the trend of the modern terminology. The new terminology classification system covering all the academic areas such as humanity, sociology, politics, science, medicine, agriculture, engineering, etc, is designed and proposed after investigating several classification systems. The classification system setup procedures follow as
The classification system is designed and planed by both the classification system and the academic expert.
Classification system design covers all the academic areas following National Science and Technology standard classification system after investigating several classification systems such as the National Research Foundation, National Science and Technology Standard Act, Ministry of Knowledge Economy.
Poll and survey is made to collect comments from total 93 members of several academic areas.
The poll result is reviewed among working group members and utilized to update the new terminology classification system. Reclassifications are made for the around 200,000 terms in electricity, computer, medicine, pharmacy, biology, and economics according to the new terminology classification system.
Independent Generation System Design for the Economic Management of Electrical Charging Stations
Seo, Jin-Gyu ; Kim, Kyu-Ho ; Rhee, Sang-Bong ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 2, 2015, Pages 222~227
DOI : 10.5370/KIEE.2015.64.2.222
This paper presents the optimal energy generation systems for economical EVs(Electric Vehicles) charging stations located in an island area. The system includes grid electricity, diesel generator and renewable energy sources of wind turbines and PV(Photovoltaic) panels. The independent generation system is designed with data resources such as annual average wind speed, solar radiation and the grid electricity price by calculating system cost under different structures. This sensitive analysis on the varying data resources allows for the configuration of the most economical generation system for charging stations by comparing initial capital, operating cost, NPC(Net Present Cost) and COE(Cost of Energy). Depending on the increase of the grid cost, the NPC variation of the most economical system which includes renewable energy generations and grid electricity can be smaller than those of other generation systems.
A Study on the Optimal Resource Configuration Considering Load Characteristics of Electric Vehicles in Micro Grid Environment
Hwang, Sung-Wook ; Chae, Woo-Kyu ; Lee, Hak-Ju ; Yun, Sang-Yun ; Kim, Jung-Hoon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 2, 2015, Pages 228~231
DOI : 10.5370/KIEE.2015.64.2.228
In power system research fields, one of current key issues is the construction and commercialization of micro grid site which is called green island, carbon zero island, energy independent island, building micro grid, etc. and various affiliated technologies have been being vigorously developed to realize. In addition, various researches about electric vehicles (EVs) are in progress and it is expected to penetrate rapidly with the next a few years. Some new load models should be developed integrating with electric vehicle loads because the EVs' deployment could cause the change of load composition rate on power system planning and operations. EVs are also resources for micro grid as well as distributed generation and demand response so that various supply and demand side resources should be considered for micro grid researches. In this paper, the load composition rate of residential sectors is prospected considering the deployment of EVs and the resource configuration of micro grid is optimized based on net present cost. In the optimization, the load patten of case studies includes EV's charging characteristics and various cases are simulated comparing micro grid environment and normal condition. HOMER is used to compare various cases and economic effects.
Control Scheme Using Active Power Regulation for DC Voltage of VSC HVDC Under Unbalanced Voltage
Park, Sang-In ; Huh, Jae-Sun ; Moon, Won-Sik ; Kim, Doo-Hee ; Kim, Jae-Chul ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 2, 2015, Pages 232~239
DOI : 10.5370/KIEE.2015.64.2.232
Faced with unbalanced grid operation mode, the high voltage direct current (HVDC) based on voltage source converter (VSC) can be properly controlled by a dual current control scheme. For the modular multilevel converter (MMC) controlling the AC side current is able to limit the arm current which flows along the IGBT of submodule (SM) to rated current. However the limitation of the arm current results in leaving the control range of active power at MMC confined to below the rated capacity. As a result, limiting the arm current causes the problem that the DC side voltage of the HVDC can not be controlled to the reference value since MMC HVDC adjusts the DC side voltage through the active power. In this paper, we propose the algorithm adjusting the active powers of both MMCs to resolve the problem. The back-to-back MMC HVDC applying the algorithm is modeled by PSCAD/EMTDC to verify the algorithm.
Effectiveness Evaluation and Operation Scheme on Cable Transposition in Underground Transmission Systems with Ungrounded Joint Box
Kim, June ; Lee, Jong-Beom ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 2, 2015, Pages 240~246
DOI : 10.5370/KIEE.2015.64.2.240
Length of most underground power cable in home is not so long. Therefore it is operated without transposition due to low unbalanced ratio. However, if cable length is long, line constant of each cable will be different. Different line constant can induce unbalanced voltage and current of sheath. Also it can induce several induced interference. This paper describes the effectiveness of transposition through sheath component analysis on transposition and untransposition of cable conductor. Especially sheath current and induced voltage are analyzed and compared in case of transposition and untransposition. EMTP is used for modeling and analysis.
Effectiveness Evaluation According to Change of IJ Joint Box Location and Grounding System in Underground Transmission System
Ko, Kwang-Man ; Lee, Jong-Beom ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 2, 2015, Pages 247~253
DOI : 10.5370/KIEE.2015.64.2.247
Dielectric breakdown accidents have been mainly occurred in the vicinity of service entrance section in underground power transmission systems. One cause among them is due to the excessive component value of sheath located around service entrance of cable. In this paper, as one of the alternative to prevent these accidents, the change of cross bond grounding system and the location change of IJ(Insulation Joint) are suggested. Also, to evaluate effectiveness of this changing system, circulating current and induced voltage of sheath were analyzed in steady and transient state. By comparison of the analytical results for the several possible changing systems, a grounding system and location of IJ which has the smallest sheath component values is proposed. In this paper, analysis to evaluate the proposed system is carried out by EMTP/ATPDraw. It can be used as a valuable operational material to prevent accident of the service entrance section in underground power transmission system.
Open-Phase Condition Detecting System for Transformer Connected Power Line in Nuclear Power Plant
Ha, Che-Wung ; Lee, Do-Hwan ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 2, 2015, Pages 254~259
DOI : 10.5370/KIEE.2015.64.2.254
On January 30, 2012 an auxiliary component of Byron Unit 2 was tripped on bus under voltage. The cause of the event was the failure of the C-phase insulator track for the Unit 2 station auxiliary transformer(SAT) revenue metering transformer. In addition to this event, other events have occurred at other plants resulting in an open-phase condition. Therefore, Nuclear Regulatory Commission(NRC) has requested that not only nuclear power plant(NPP) operating company but also its Design Certification(DC) applicant have to prepare open-phase detecting system in their operating plants and design document. In this paper, various open-phase conditions are simulated in NPP using Electromagnetic Transient Program(EMTP) and Atpdraw, and open-phase condition detecting system is proposed for Main Transformer(MT), Unit Auxiliary Transformer(UAT) and SAT connected power line in NPP.
Characteristics and Implementation of LCL Type DC-DC Converter for Constant Voltage Power supply
Park, Sangeun ; Cha, Hanju ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 2, 2015, Pages 260~267
DOI : 10.5370/KIEE.2015.64.2.260
An LCL-type isolated dc-dc converter is analyzed, using ac approximation. Analyses to express characteristics on the proposed converter are derived under steady and ideal elements conditions in this paper. The two operating modes can be identified from the analysis results representing different device conduction sequences. This converter is capable of achieving required output voltage(step up or down) operations with inductance ratio while operated at fixed frequency with constant duty ratio-50%. Experimental results show that the designed converter based on Q has zero voltage switching and constant output voltage at different load variations to verify the analysis.
A New Switching Method for Reducing switch loss of Single-phase three-level NPC inverter
Lee, Seung-Joo ; Lee, June-Seok ; Lee, Kyo-Beum ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 2, 2015, Pages 268~275
DOI : 10.5370/KIEE.2015.64.2.268
This paper proposes a method of switching to improve power loss for the single-phase three-level NPC inverter. The conventional switching methods, which are called as the bipolar and unipolar switching methods, are used for single phase inverters using three-level topology. However, these switching method have disadvantage in the power loss. Because all of the switch are operated. To reduce the power loss of the three-level NPC inverter, clamp switching method is introduced in this paper. This way, one of the lag is fixed that switching loss is reduced. This paper analyzes and compares power losses of unipolar method and clamp method. The validity of the power loss analysis is verified through the simulation and experimental results.
A Study on Backscatter Field Reduction of the Curved Aluminum Plate using Active Cancellation Circuit
Kim, Junhwan ; Chung, Young-Seek ; Cheon, Changyul ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 2, 2015, Pages 276~279
DOI : 10.5370/KIEE.2015.64.2.276
This paper propose a method to reduce the backscatter field of the curved aluminum plate using the cancellation system. The cancellation circuit is composed of a circulator, a LNA(Low Noise Amplifier), a VGA(Variable Gain Amplifier) and two phase shifters. Prior to experiment, we performed simulations to confirm the possibility using FDTD(Finite Difference Time Domain) simulator. We confirmed that the backscatter field could be reduced by the cancellation circuit when we changed the appropriate gain and phase. Finally, we performed an experiment to verify the performance of the cancellation circuit.
A RF Resonator Using Square SRR at 3 T MRI
Son, Hyeok-Woo ; Cho, Young-Ki ; Yoo, Hyoungsuk ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 2, 2015, Pages 280~283
DOI : 10.5370/KIEE.2015.64.2.280
This paper demonstrates a new radio frequency (RF) resonator at 3 T magnetic resonance imaging (MRI) system. An approach based on a split ring resonator (SRR) having effective metamaterial properties is investigated. Electromagnetic simulation results are compared for RF resonators and discussed in detail at 3 T. A new RF resonator has approximately 10% higher magnetic fields at the center of the human phantom than the previous RF resonator.
The Color Temperature Flexibility-typed LED Lighting Control System
Kim, Hye-Myeong ; Yang, Woo-Seok ; Cho, Young-Seek ; Park, Dae-Hee ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 2, 2015, Pages 284~288
DOI : 10.5370/KIEE.2015.64.2.284
The color temperature flexibility-typed Lighting Emitting Diode(LED) lighting control system proposed in this thesis employs Pulse Width Modulation(PWM) technique to control the brightness of LED lighting. The LED lighting used as a light source has 20W downlight composed of two types of LED chips: one is Warm White and the other is Cool white. One multi-sensor module consisting an infrared sensor, an illumination sensor, and a temperature sensor was made, to which Bluetooth wireless communication technique was applied to enable a smartphone application to control lighting brightness and identify the information collected from the sensor. CS-1000, a spectroradiometer, was used to measure LED dimming control and the changing values of a color temperature in eight steps. According to a test, it was found that it was possible to change a color temperature from 3187K of Warm White LED to 5600K of Cool White LED.
Simplified Nonlinear Control for Planar Motor based on Singular Perturbation Theory
Seo, HyungDuk ; Shin, Donghoon ; Lee, Youngwoo ; Chung, Chung Choo ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 2, 2015, Pages 289~296
DOI : 10.5370/KIEE.2015.64.2.289
In this paper, we propose the nonlinear control based on singular perturbation theory for position tracking and yaw regulation of planar motor. Singular perturbation theory is characterized by the existence of slow and fast transients in the system dynamics. The proposed method consists of auxiliary control to decouple error dynamics. We develop model reduction with control input. Also, we derIve decoupled error dynamics with auxiliary input. The controller is designed in order to guarantee the desired position and yaw regulation without current feedback or estimation. Simulation results validate the effect of proposed method.
Disturbance Observer based Feedback Linearization Control for Electro-Hydraulic Servo Systems
Won, Daehee ; Kim, Wonhee ; Chung, Chung Choo ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 2, 2015, Pages 297~303
DOI : 10.5370/KIEE.2015.64.2.297
We propose a disturbance observer(DOB) based feedback linearization control to improve position tracking performance in the presence of disturbance. The proposed method consists of a disturbance observer and a feedback linearization controller. The disturbance observer is designed to estimate the load force disturbance in electro-hydraulic systems. An auxiliary state variable is proposed in order to avoid amplification of the measurement noises in the disturbance observer. Using the estimated disturbance enables the Electro-hydraulic servo systems(EHS) dynamics to be changed into feedback linearization from. In order to compensate for the disturbance and to track the desired position, the feedback linearization based controller is proposed. The proposed method has a simple structure which can easily be implemented in practice. As a result, the proposed method improves the position tracking performance in the presence of disturbance. Its performance is validated via simulations.
Analysis for the Fluctuation of the Photoplethysmographic Waveform derived by Temperature Stress of Measuring Position
Lee, Chungkeun ; Shin, Hangsik ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 2, 2015, Pages 304~309
DOI : 10.5370/KIEE.2015.64.2.304
Applicable range of Photoplethysmography (PPG) becomes wider as a non-invasive physiological measurement technique. However, PPG waveform is easy to be distorted by ambient light or vascular variation from temperature changes. Especially, irregular variation of PPG waveform caused by ambient temperature not only severely distorts the PPG, but also leads miss interpretation in clinical applications. Therefore, the investigation of between temperature and PPG waveform is quite important in using PPG. The purpose of this research is to quantify the PPG waveform characteristic and to investigate the waveform variation following the temperature change on measuring site. To quantify the fluctuation of PPG waveform, we use two techniques; detrended fluctuation analysis (DFA) and AC/DC analysis of PPG. We record PPG under temperature stress, which applied by medical use heat pack (
) and ice pack (
). Ten participants were applied to the experiment, and the result was evaluated to approve the temperature effect with statistical method, Wilcoxon signed rank test. The result shows that the AC component (p<0.05) and perfusion index DFS scale exponent (p<0.01) of PPG have the significance to temperature stress except for a DC component of PPG.
Design and Fabrication of Pattern Structures of the Light Guide Plate for Enhanced Brightness of Backlight Unit
Bae, Chang-Hwan ; Heo, Kyung Chan ; Jhun, Chul Gyu ; Rvu, Bong Jo ; Koo, Kyung Wan ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 2, 2015, Pages 310~314
DOI : 10.5370/KIEE.2015.64.2.310
To improve the optical performance of the backlight unit with light guide plate(LGP), we investigated the effects of LGP patterns on the brightness and viewing angles properties of the backlight unit. We designed several patterns of LGP and calculated their optical properties by the optical simulation. The results reveal that the highest brightness and wide viewing angle was achieved with the extended-closed-polygon diffusion pattern and upper triangle prism pattern of the LGP.
A Study on a Substation Static Load Model Including the Mobility of a Railway Load
Chang, Sang-Hoon ; Youn, Seok-Min ; Kim, Jung-Hoon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 2, 2015, Pages 315~323
DOI : 10.5370/KIEE.2015.64.2.315
Nowadays, it is expected that mobility loads such as electric railways and electric vehicles will be penetrated gradually and affect on the power system stability by their load characteristics. Various researches have been carried out about electric vehicles for the recent decade though the load of electric railway could be forecasted because of the specified path and timetable, is a field with a long historic background. Some precise 5th polynomial equations are required to analyze the power system stability considering mobility load to be increased in the immediate future while the electric railway dispatching simulator uses load models with constant power and constant impedance for the system analysis. In this paper, seasonal urban railway load models are established as the form of 5th polynomial equations and substation load modeling methods are proposed merging railway station load models and general load models. Additionally, load management effects by the load modeling are confirmed through the case studies, in which seasonal load models are developed for Seoul Subway Line No. 2, Gyeongui Line and Airport Railroad and the substation load change is analyzed according to the railway load change.
Multilevel Inverter Development to Utilize Renewable Energy in Urban Railway Station
Shin, Seungkwon ; Kim, Hyungchul ; Jung, Hosung ; Park, Jong Young ; Hyun, Byungsoo ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 2, 2015, Pages 324~330
DOI : 10.5370/KIEE.2015.64.2.324
Energy Saving Methods in existing railway vehicle are considered by active approach such as regenerative energy storage and utilization, eco driving, etc. On the other hands, energy saving measures in railway station are operated by passive method such as reduction of operating time in ventilation system, cooing system and power equipment. To reduce energy and for independence in railway system, it requires an active energy saving measures. It needs to its own power source besides the power source of electric supply company such as renewable energy and regenerative energy and take the advantage of power storage system and stored power are used in optimum time. This paper deal with 3-level NPC inverter and T-type NPC inverter that used in various multi-level topology applicable to the railway system.
A Study on Verification of PowerRail based on Voltage Drop under Extended Feeding Condition
Kim, Joorak ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 2, 2015, Pages 331~337
DOI : 10.5370/KIEE.2015.64.2.331
The power flow analysis of electrified railway is required complicated calculation, because of variable load. Train runs trough rail supplied by electric power therefore, the load value in electrified railway system fluctuates along time. The power flow algorithm in electrified railway system is different from general power system, and the power flow simulation is peformed by the particular simulation software. Powerail is simulation software for analysis of traction power supply system developed by KRRI, in 2008. This consists of load forecasting module, including TPS and time scheduling, and power flow module. This software was verified by measured current under normal feeding condition, however, has not been verified by voltage on the condition of extended feeding. This paper presents the verification of PowerRail based on voltage drop under extended feeding condition. This is performed by comparing simulation result with field test. Field test and simulation is done in commercial railway line.
A Study on the Disturbance Reduction of Magnetic Levitation System using the EMS Method
Park, Eung-Seok ; Lee, Ju ; Jin, Chang-Sung ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 2, 2015, Pages 338~341
DOI : 10.5370/KIEE.2015.64.2.338
From the past, maglev technique study(mainly for transportation like maglev) has been done. In the domestic, urban maglev train is practical steps now. High-speed maglev train(550km/h) development comes complete, followed by Japan. This year, system of High-speed maglev train(550km/h) is expected to be verified. This paper simulate FEM model for EMS(Electro-Magnetic Suspension) maglev system and verify tendency of reducing disturbance.
The Voltage Drop Compensation of Electric Railway Feeding system using a Fuelcell System
Kim, Jae-Moon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 2, 2015, Pages 342~348
DOI : 10.5370/KIEE.2015.64.2.342
In this paper, fuel cell power generation system that is being studied in recent railway field was applied to compensate for the voltage drop due to the load as driving electric vehicle. PSIM simulation program is to be used to implement the modeling of the electric railway for AC AT feeder system. For it, It was applied to the product-type single-phase PLL algorithm, step-down converter is controlled as power so as to have the fuelcell generation system. Based on it's result, a reactive power due to the catenary impedance in accordance with the current flowing is compensated as linked with fuelcell generation system which supplied the current to the power supply grid. and then its performance was confirmed that voltage compensation effect obtained at SubStation (SS), SubSectioning Post (SSP), Sectioning Post (SP).
The Development on the Estimate method for the Cost-Effect Analysis of the Electrical Safety Management
Yoo, Jae-Geun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 2, 2015, Pages 349~352
DOI : 10.5370/KIEE.2015.64.2.349
This paper estimates electrical fire damage cost-effect to analyze electrical safety efficiency by applying a cost-benefit analysis method for analyzing the efficiency of a business public interest. Electrical fire loss statistics data was presented as direct costs and casualties, including deaths due to an electrical fire, this paper adds overhead "Incidental Cost of Accidents to the Employer" by W. H. Heinrich was applied to estimate the cost of economic loss. Also wounded, including the loss of human deaths by referring to the car accident insurance claims costs and human development estimated the losses caused by an electrical fire. And to perform a cost-benefit analysis of the electrical safety as a result of future work. In this paper, the economic effect of the electric field of safety and public interest work to systematically presented.
Efficiency Enhancement of a Wireless Power Transmission System Applying a Superconducting Coil
Kang, Min-Sang ; Choi, Hyo-Sang ; Jeong, In-Sung ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 2, 2015, Pages 353~356
DOI : 10.5370/KIEE.2015.64.2.353
Due to high oil prices, environmental pollution, the study of electric vehicles have been actively promoted. Charger for the electric vehicle is being developed using wireless rather than cable options. In this paper, we got more efficiency from using a superconducting transmission coil compared to using a normal coil. We implemented a wireless power transmission system using a magnetic induction at a frequency of 63.1 kHz. For comparison, a transmitter was designed using a superconducting coil and a normal coil. In addition, a receiver used a normal coil to apply for electric vehicles. The applied voltage and current were12 V and 5 A. Efficiency at a distance of 40 ~ 80 mm was measured. As a result, the superconducting transmission coil had a higher efficiency than the normal transmission coil. However, the receiving coil should be normal conductor for stable operation considering that it was put in moving electric vehicle. The efficiency was increased to 44 % at a distance of 40 mm when the diameter of normal receiving coil was 120 mm.