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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 65, Issue 9 - Sep 2016
Volume 65, Issue 8 - Aug 2016
Volume 65, Issue 7 - Jul 2016
Volume 65, Issue 6 - Jun 2016
Volume 65, Issue 5 - May 2016
Volume 65, Issue 4 - Apr 2016
Volume 65, Issue 3 - Mar 2016
Volume 65, Issue 2 - Feb 2016
Volume 65, Issue 1 - Jan 2016
Selecting the target year
A Study on the Countermeasure Algorithm for Power System Disturbances in Large Scale Fuel Cell Generation System
Choi, Sung-sik ; Kim, Byung-ki ; Park, Jae-beom ; Rho, Dae-seok ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 5, 2016, Pages 711~717
DOI : 10.5370/KIEE.2016.65.5.711
Recently, fuel cell generation system with high energy efficiency and low CO2 emission is energetically interconnected with distribution power system. Especially, MCFC(molten carbonate fuel cell) operating at high temperature conditions is commercialized and installed as a form of large scale power generation system. However, it is reported that power system disturbances such as harmonic distortion, surge phenomenon, unbalance current, EMI(Electromagnetic Interference), EMC (Electromagnetic Compatibility) and so on, have caused several problems including malfunction of protection device and damage of control devices in the large scale FCGS(Fuel Cell Generation System). Under these circumstances, this paper proposes countermeasure algorithms to prevent power system disturbances based on the modelling of PSCAD/EMTDC and P-SIM software. From the simulation results, it is confirmed that proposed algorithms are useful method for the stable operation of a large scale FCGS.
A Study on the Weekend Load Forecasting of Jeju System by using Temperature Changes Sensitivity
Jeong, Hui-Won ; Ku, Bon-Hui ; Cha, Jun-Min ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 5, 2016, Pages 718~723
DOI : 10.5370/KIEE.2016.65.5.718
The temperature changes are very important in improving the accuracy of the load forecasting during the summer. It is because the cooling load in summer contribute to the increasing of the load. This paper proposes a weekend load forecasting algorithm using the temperature change characteristic in a summer of Jeju. The days before and after weekends in Jeju, when the load curves are quite different from those of normal weekdays. The temperature change characteristic are obtained by using weekends peak load and high temperature data. And load forecasted based on the sensitivity between unit temperature changes and load variations. Load forecast data with better accuracy are obtained by using the proposed temperature changes than by using the ordinary daily peak load forecasting. The method can be used to reduce the error rate of load forecast.
Modeling & Operating Algorithm of Hybrid Generation System with PMSG Wind Turbine, Diesel Generator and BESS
Oh, Joon-Seok ; Jeong, Ui-Yong ; Park, Jong-Ho ; Park, Min-Su ; Kim, Jae-Eon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 5, 2016, Pages 724~729
DOI : 10.5370/KIEE.2016.65.5.724
Nowadays high-cost energy storage system using flywheel or secondary battery is applying to hybrid generation system with WT(Wind Turbine) and diesel generator in island areas for stable operation. This paper proposes an operating algorithm and modeling method of the hybrid generation system that can operate for variable wind speed and load, which is composed of energy storage system, variable-speed PMSG(Permanent Magnet Synchronous Generator) WT and diesel generator applied in island areas. Initially, the operating algorithm was proposed for frequency and voltage to be maintained within the proper ranges for load and wind speed changes. Also, the modeling method is proposed for variable speed PMSG WT, diesel generator and BESS(Battery Energy Storage System). The proposed operating algorithm and modeling method were applied to a typical island area. The frequency and voltage was kept within the permissible ranges and the proposed method was proven to be appropriate through simulations.
An Adaptive Control of Smart Appliances with Peak Shaving Considering EV Penetration
Haider, Zunaib Maqsood ; Malik, Farhan H. ; Rafique, M. Kashif ; Lee, Soon-Jeong ; Kim, Jun-Hyeok ; Mehmood, Khawaja Khalid ; Khan, Saad Ullah ; Kim, Chul-Hwan ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 5, 2016, Pages 730~737
DOI : 10.5370/KIEE.2016.65.5.730
Electric utilities may face new threats with increase in electric vehicles (EVs) in the personal automobile market. The peak demand will increase which may stress the distribution network equipment. The focus of this paper is on an adaptive control of smart household appliances by using an intelligent load management system (ILMS). The main objectives are to accomplish consumer needs and prevent overloading of power grid. The stress from the network is released by limiting the peak demand of a house when it exceeds a certain point. In the proposed strategy, for each smart appliance, the customers will set its order/rank according to their own preferences and then system will control the household loads intelligently for consumer reliability. The load order can be changed at any time by the customer. The difference between the set and actual value for each load's specific parameter will help the utility to estimate the acceptance of this intelligent load management system by the customers.
A Review Method of Calculation Results on Cable Ampacity using the Transformation to Electric Equivalent Circuit from Cable Thermal Circuit
Kang, Yeon-Woog ; Kim, Min-Ju ; Jang, Tae-In ; Park, Jin-Woo ; Park, Hung-Sok ; Kang, JI-Won ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 5, 2016, Pages 738~744
DOI : 10.5370/KIEE.2016.65.5.738
Current rating of a power cable can be calculated by the maximum allowable temperature in an insulating material considering the heat transfer from cable conductor. Therefore, it is very important to calculate the current rating using electrical equivalent circuit by calculated cable thermal circuit parameters but, it has not been fully investigated yet. In this paper, in order to determine the current rating of power cable, conventional calculation method has been reviewed considering the conductor resistance, loss factor of sheath, dielectric losses and thermal resistances based on the maximum allowable temperature of 345 kV
XLPE cable. To confirm the calculation result of the current rating, the conductor temperature should be examined whether it reaches the maximum allowable temperature by the thermal equivalent circuit of the cable. Then, utilizing EMTP (Electro-Magnetic Transient Program) which is a conventional program for electrical circuit, the thermal equivalent circuit was transformed to an electric equivalent circuit using an analogous relationship between thermal circuit and electrical circuit, and temperature condition including cable conductor, sheath, cable jacket could be calculated by the current rating of 345 kV
A Method of Computing the Frequency-Dependent Ground Impedance of Horizontally-buried Wires
Cho, Sung-Chul ; Lee, Bok-Hee ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 5, 2016, Pages 745~752
DOI : 10.5370/KIEE.2016.65.5.745
The parameters of Debye's equation were applied to analyze the frequency-dependent ground impedance of horizontally-buried wires. We present a new method, based on Debye's equation, of analyzing the effect of polarization on frequency-dependent ground impedance. The frequency-dependent ground impedances of a horizontally-buried wire are directly measured and calculated by applying sinusoidal current in the frequency range of 100 Hz to 10 MHz. Also, the results obtained in this work were compared with the data calculated from empirical equations and commercial programs. A new methodology using the delta-gap source model is proposed in order to calculate frequency-dependent ground impedance when the ground current is injected at the middle-point of the horizontal ground electrode. The high frequency ground impedance of horizontal electrodes longer than 30 m is larger or equal to its low frequency ground resistance. Consequently, the frequency-dependent ground impedance simulated with the proposed method is in agreement with the experimental data, and the validity of the computational simulation approach is confirmed.
A Design of Advanced Distribution Management System Based on IT/OT Convergence
Lim, Il-Hyung ; Lee, Seung-Joo ; Park, Jong-Ho ; Shin, Yong-Hak ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 5, 2016, Pages 753~759
DOI : 10.5370/KIEE.2016.65.5.753
Power automation system to operate power distribution systems can be distinguished by distribution SCADA with remote monitoring and control; and distribution automation system with basic functions such as service restoration to the distribution SCADA; and distribution management system which is operated by various applications in order to enhance distribution system operation performance based on the distribution automation system. In the technological change, a technical boundary of information technology (IT) and operation technology (OT) is being blurred by that new concepts such as interoperability. In addtion, IT/OT convergence has been proposed by the improvement of ICT and power system technology. At the viewpoint, advanced distribution management system (ADMS) to have the new concepts and to increase distribution system operation efficiency through global information and functions from the other systems has been proposed. In order to implement the ADMS, IT and OT have to be employed together on the ADMS; and the concept-based IT/OT convergence concept has been presented. Therefore, this paper introduces ADMS and IT/OT convergence and proposes a design of IT/OT convergence based ADMS system design with configurations and functions.
A Study on the Modeling and Operation Algorithm of Independent Power System for Carbon Free
Wang, Jong-Yong ; Kim, Byung-Ki ; Park, Jea-Bum ; Kim, Byung-Mok ; Kim, Eung-Sang ; Rho, Dae-Seok ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 5, 2016, Pages 760~768
DOI : 10.5370/KIEE.2016.65.5.760
Recently, as one of the policies for carbon free operation method of independent power system replacing diesel generator with renewable energy such as wind power and photovoltaic(PV) system has been presented. Therefore, this paper proposes an operation algorithm and modeling of independent power system by considering CVCF(constant voltage constant frequency) ESS(energy storage system) for constant frequency and voltage, LC(load control) ESS for demand and supply balancing and SVC(static var compensator) for reactive power compensation. From the simulation results based on the various operation scenario, it is confirmed that proposed operation algorithm and modeling may contribute stable operation and carbon free in independent power system.
Overhang Effect on the Axial Flux Permanent Magnet Motor
Woo, Dong-Kyun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 5, 2016, Pages 769~772
DOI : 10.5370/KIEE.2016.65.5.769
In this paper, the overhang structure was applied to the axial flux permanent magnet (AFPM) motor. This paper describes the overhang effect in the AFPM motor. Moreover, the overhang effect was analyzed according to the different overhang length and an optimal overhang structure was proposed. Finally, the proposed structure was applied to design, analysis and experiment of prototype motors. Through the comparison between 3D finite element analysis results and experimental ones, the validity of proposed structure is clarified.
The Improved Quasi-3D FE Analysis on the AFPM Motor
Woo, Dong-Kyun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 5, 2016, Pages 773~776
DOI : 10.5370/KIEE.2016.65.5.773
In the quasi-3D finite element(FE) anlysis, the overall characteristics of axial flux permanent magnet(AFPM) motor could be composed of each computation region. However, A drawback of quasi-3D FEM is not to consider the end effect on the stack end. To address this problem, an improved quasi-3D FE analysis which considers the end effect of the AFPM motor was proposed. From results the 3D FE analysis, the validity of the proposed method is verified.
Characteristic Analysis and Test of IPMSM for e-4WD of the Hybrid Electric Vehicle
Jung, Soo-Jin ; Lee, Ju ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 5, 2016, Pages 777~784
DOI : 10.5370/KIEE.2016.65.5.777
In this paper, the performance design and analysis for an Interior Permanent-Magnet Synchronous Motor (IPMSM) that will be used as a traction motor in the e-4WD system of hybrid SUV(Sports Utility Vehicle) and RV(Recreational Vehicle), are investigated using finite element method. In order to improve the accuracy of design, the tolerances of parts and assemblies as well as the material properties of permanent magnet, stator, rotor and winding etc. are considered under the conditions similar to real driving state of motor. Both no load performance test and maximum load performance test, in which real driving state and cooling condition have been considered, are also implemented via proto sample build to verify the validity of motor's performance design.
Analysis of the Fixed Frequency LCL-type Converter at Continuous Current Mode Including Parasitic Losses
Park, Sangeun ; Cha, Hanju ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 5, 2016, Pages 785~793
DOI : 10.5370/KIEE.2016.65.5.785
This paper analyzes an LCL-type isolated dc-dc converter operating for constant output voltage in the continuous conduction mode(CCM) with resistances of parasitic losses-static drain-source on resistance of power switch, ESR of resonant network(L-C-L)-using a high loaded quality factor Q assumptions and fourier series techniques. Simple analytical expressions for performance characteristics are derived under steady-state conditions for designing and understanding the behavior of the proposed converter. The voltage-driven rectifier is analyzed, taking into account the diode threshold voltage and the diode forward resistance. Experimental results measured for a proposed converter at low input voltage and various load resistances show agreement to the theoretical performance predicted by the analysis within maximum 4% error. Especially in the case of low output voltages and large loads, It is been observed that introduction of both rectifier and the parasitic components of converter had considerable effect on the performance.
A Sensorless Control of IPMSM using the Adaptive Back-EMF Estimator and Improved Instantaneous Reactive Power Compensator
Lee, Joonmin ; Hong, Joo-Hoon ; Kim, Young-Seok ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 5, 2016, Pages 794~803
DOI : 10.5370/KIEE.2016.65.5.794
This paper propose a sensorless control system of IPMSM with a adaptive back-EMF estimator and improved instantaneous reactive power compensator. A saliency-based back-EMF is estimated by using the adaptive algorithm. The estimated back-EMF is inputted to the phase locked loop(PLL) and the improved instantaneous reactive power(IRP) compensator for estimating the position/speed of the rotor and compensating the error components between the estimated and the actual position, respectively. The stability of the proposed system is achieved through Popov's hyper stability criteria. The validity of proposed algorithm is verified by the simulations and experiments.
A Study on the Photovoltaic System Inverter Sizing
Lee, Kyung-Soo ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 5, 2016, Pages 804~810
DOI : 10.5370/KIEE.2016.65.5.804
Photovoltaic system construction of the module capacity in domestic is specified criteria to less than 105% of the inverter capacity. However, the modules are installed in the outdoor actual output is reduced due to factors such as the irradiation intensity, module surface temperature. Thus, it needs the capacity of the inverter to be designed according to the actual module output. In this paper, the first approach to find the actual module output is to analyze the actual PV system monitoring data. Next, four sites where the loss analysis, system utilization, inverter utilization, and the ratio of the inverter overload are performed using PVSYST software. By changing the ratio of the module capacity, the inverter capacity of the site B is confirmed 20% less than the module capacity. Site A, C, D are identified as the ratio of the inverter capacity is 10% less than the module capacity.
Development of Unified SCADA System Based on IEC61850 in Wave-Offshore Wind Hybrid Power Generation System
Lee, Jae-Kyu ; Lee, Sang-Yub ; Kim, Tae-Hyoung ; Ham, Kyung-Sun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 5, 2016, Pages 811~818
DOI : 10.5370/KIEE.2016.65.5.811
This paper suggests a structure of power control system in floating wave-offshore wind hybrid power generation system. We have developed an unified SCADA(Supervisory Control and Data Acquisition) system which can be used to monitor and control PCS(Power Conversion System) based on IEC61850. The SCADA system is essential to perform the algorithm like proportional distribution and data acquisition, monitoring, active power, reactive power control in hybrid power generation system. IEC61850 is an international standard for electrical substation automation systems. It was made to compensate the limitations of the legacy industrial protocols such as Modbus. In order to test the proposed SCADA system and algorithm, we have developed the wind-wave simulator based Modbus. We have designed a protocol conversion device based on real-time Linux for the communication between Modbus and IEC61850. In this study, SCADA system consists of four 3MW class wind turbines and twenty-four 100kW class wave force generator.
Effects of Seawater & Freshwater Soaking on the Cure Properties of Accelerated Thermally Aged CSPE
Shin, Yong-Deok ; Lee, Jeong-U ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 5, 2016, Pages 819~824
DOI : 10.5370/KIEE.2016.65.5.819
The accelerated thermal aging of CSPE (chlorosulfonated polyethylene) was carried out for 33.64 and 67.27 days at 110[
], equivalent to 40 and 80 years of aging at 50[
], respectively. These samples were referred to as CSPE-0y, CSPE-40y and CSPE-80y, respectively. As the accelerated thermally aged years of the CSPE increase, the insulation resistance[
] at 20[Hz], 500[Hz], and 2[KHz], and the percent elongation [%EL] of the CSPE decrease. However, the dissipation factor(
) at 20[Hz], 500[Hz], and 2[KHz], the apparent density[
], the glass transition temperature and the melting temperature of the CSPE were increased. The period of time that the voltage has to be applied until electric breakdown of the CSPE-0y is longer than that of the CSPE-40y, and the CSPE-80y, but the dielectric strength of the CSPE-80y is lower than that of the CSPE-0y and the CSPE-40y. The differential temperatures after the AC and DC voltages are applied to CSPE-0y, CSPE-40y and CSPE-80y are 0.026~0.028[
], respectively. The variations of temperature for the AC voltage are higher than those for the DC voltage when an AC voltage is applied to CSPE-0y, CSPE-40y and CSPE-80y. It is found that the dielectric loss owing to the dissipation factor[
] is related to the electric dipole conduction current. It is ascertained that the ionic (electron or hole) leakage current is increased by the separation of the branch chain of CSPE polymer from the main chain of the polyethylene as a result of thermal stress due to accelerated thermal aging as well as by conducting ions such as
after seawater soaking.
Optimal Printing Conditions of PLA Printing Material for 3D Printer
You, Do-Hyun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 5, 2016, Pages 825~830
DOI : 10.5370/KIEE.2016.65.5.825
The purpose of this study optimizes the conditions of PLA printing material for 3D printer. Deltabot type 3D printer is used. The ranges of printing temperature, printing speed, and infill density are
, 10~70mm/sec, and 10~100% respectively. From the results of printing temperature, printing quality is almost same every printing temperature. From the results of printing speed and infill density, printing quality is excellent under 40mm/sec, and over 50% respectively. Surface roughness is
, 10mm/sec, 100%, and is
, 70mm/sec. Surface roughness is directly proportional to the printing speed, and is inversely proportional to the infill density. Objects fabricated PLA printing material adhere bed at room temperature.
A Dual-Channel CMOS Transimpedance Amplifier Array with Automatic Gain Control for Unmanned Vehicle LADARs
Hong, Chaerin ; Park, Sung Min ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 5, 2016, Pages 831~835
DOI : 10.5370/KIEE.2016.65.5.831
In this paper, a dual-channel feed-forward transimpedance(TIA) array is realized in a standard
CMOS technology which exploits automatic gain control function to provide 40-dB input dynamic range for either detecting targets nearby or sensing imminent danger situations. Compared to the previously reported conventional feed-forward TIA, the proposed automatic-gain-control feed-forward TIA(AFF-TIA) extends the input dynamic range 25 dB wider by employing a 4-level automatic gain control circuit. Measured results demonstrate the linearly varying transimpedance gain of 47 to
, input dynamic range of 1:100, the bandwidth of
, the equivalent input referred noise current spectral density of 6.9 pA/
HZ, the maximum sensitivity of -26.8 dBm for
, and the power consumption of 27.6 mW from a single 1.8-V supply. The dual-channel chip occupies the area of
including I/O pads.
Fault Detection Sensitivity of a Data-driven Empirical Model for the Nuclear Power Plant Instruments
Hur, Seop ; Kim, Jae-Hwan ; Kim, Jung-Taek ; Oh, In-Sock ; Park, Jae-Chang ; Kim, Chang-Hwoi ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 5, 2016, Pages 836~842
DOI : 10.5370/KIEE.2016.65.5.836
When an accident occurs in the nuclear power plant, the faulted information might mislead to the high possibility of aggravating the accident. At the Fukushima accident, the operators misunderstood that there was no core exposure despite in the processing of core damage, because the instrument information of the reactor water level was provided to the operators optimistically other than the actual situation. Thus, this misunderstanding actually caused to much confusions on the rapid countermeasure on the accident, and then resulted in multiplying the accident propagation. It is necessary to be equipped with the function that informs operators the status of instrument integrity in real time. If plant operators verify that the instruments are working properly during accident conditions, they are able to make a decision more safely. In this study, we have performed various tests for the fault detection sensitivity of an data-driven empirical model to review the usability of the model in the accident conditions. The test was performed by using simulation data from the compact nuclear simulator that is numerically simulated to PWR type nuclear power plant. As a result of the test, the proposed model has shown good performance for detecting the specified instrument faults during normal plant conditions. Although the instrument fault detection sensitivity during plant accident conditions is lower than that during normal condition, the data-drive empirical model can be detected an instrument fault during early stage of plant accidents.
Design and Implementation of a Control System for the Interleaved Boost PFC Converter in On-Board Battery Chargers
Lee, Jun Hyok ; Jung, Kwang-Soon ; Lee, Kyung-Jung ; Jung, Jae Yeop ; Kim, Ho Kyung ; Hong, Sung-Soo ; Ahn, Hyun-Sik ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 5, 2016, Pages 843~850
DOI : 10.5370/KIEE.2016.65.5.843
In this paper, we propose a digital controller design process for the interleaved type of a boost PFC (Power Factor Correction) converter which can disperse the heat of the switching devices due to the interleaved topology. We establish a mathematical model of a boost PFC converter and propose a controller design method based on the root locus. The performance of the designed controller is verified by simulations. The measurement of the input voltage, inductor currents, and the converter output link voltage are needed for the control of the converter system which consists of a power unit and a control unit where a high-performance 32-bit microcontroller is used. The adjustment of A/D conversion timing is also needed to avoid high frequency noise generated when the switches on/off. It is illustrated by the real experiments that the designed control system with the properly adjusted ADC timing satisfies the given performance specifications of the interleaved boost PFC converter in the on-board slow battery charger.
Comparison of MLR and SVR Based Linear and Nonlinear Regressions - Compensation for Wind Speed Prediction
Kim, Junbong ; Oh, Seungchul ; Seo, Kisung ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 5, 2016, Pages 851~856
DOI : 10.5370/KIEE.2016.65.5.851
Wind speed is heavily fluctuated and quite local than other weather elements. It is difficult to improve the accuracy of prediction only in a numerical prediction model. An MOS (Model Output Statistics) technique is used to correct the systematic errors of the model using a statistical data analysis. The Most of previous MOS has used a linear regression model for weather prediction, but it is hard to manage an irregular nature of prediction of wind speed. In order to solve the problem, a nonlinear regression method using SVR (Support Vector Regression) is introduced for a development of MOS for wind speed prediction. Experiments are performed for KLAPS (Korea Local Analysis and Prediction System) re-analysis data from 2007 to 2013 year for Jeju Island and Busan area in South Korea. The MLR and SVR based linear and nonlinear methods are compared to each other for prediction accuracy of wind speed. Also, the comparison experiments are executed for the variation in the number of UM elements.
A Study on Wrist Band Type Vital Sign Acquisition Device
Kim, Hee-Hoon ; Kim, Kyung-Ho ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 5, 2016, Pages 857~861
DOI : 10.5370/KIEE.2016.65.5.857
In this study, we proposed a new method that can be measure ECG (Electrocardiography) and PPG (Photoplethysmography) in realtime on the site of the wrist for check the state of health in daily life. For convenience measurement of ECG the lead I method was used on the wrist, and omit the reference junction ECG I was measured in the right hand and the left hand of the potential difference. Then the measured electrocardiogram was amplified by the differential amplifier and the signals were passed HPF, LPF, and BPF filters. For removing the PPG's noise from the Motion artifact and temperature, we apply the reflective photoelectric volume pulse wave measurement method using green LED as a light source. The circuits was designed to be able to check the waveform using higher active amplification method at weak signals. For the validation of our device, the measured signals were compared with E2-KIT on same time. The results shows that the error does not exceed the maximum one, most of the data is confirmed to be issued Peak inspection of the same number.
A Design of Infant's Body Temperature Sensing System Based on Embroidery Textile Conductive Wire
Song, Ha-Young ; Lee, Kang-Hwi ; Lee, Jeong-Whan ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 5, 2016, Pages 862~867
DOI : 10.5370/KIEE.2016.65.5.862
In this study, the embroidery textile conductive wire of conductive yarn was designed into the wearable integrated clothing for sensing the infant's body temperature. To develop a high quality of the stable fiber-based textile conductive wire, firstly the five types of conductive yarns were twisted or covering polyester yarns and the coated conductive fiber with silver(Ag) or iron(Fe). As a result of comparative conductivity in conductive yarns of yarn processing, the 250 denier of conductive yarns with
/1~5cm were proposed and used for the integrated embroidery textile conductive wire for sensing. During experiments using the proposed embroidery textile conductive wire, measured resistance of thermistor according to the body temperature was correctly delivered to amplifier module, and showed feasible reliability of temperature sensing. As a wearable application, conductive yarns which takes forms of embroidery textile conductive wire would seems to be reliable as a conductive wire and could be replaced by the conductive metal wires.
Development of a Driver for BLDC Motors Using Smart Communication Platform
Lee, Injae ; Basnet, Barun ; Bang, Junho ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 5, 2016, Pages 868~872
DOI : 10.5370/KIEE.2016.65.5.868
This paper presents the design of a BLDC motor driver applicable to various valve control systems using smart devices. BLDC motors are relatively small in size and have better performance than other motors. They help in reducing maintenance cost, installation costs and power consumption in plant facilities. The proposed driver is specially designed for BLDC motors using Smart Communication Platform. It adds smart features in the valve control system using BLDC motors such as multi-management, control, networking and monitoring in real time with the help of smart devices.
Transient Characteristics of a Transformer Type SFCL Applying the Superconductor and the Normal-conductor into the Secondary Winding
Jung, Byung-Ik ; Choi, Hyo-Sang ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 5, 2016, Pages 873~877
DOI : 10.5370/KIEE.2016.65.5.873
This paper proposed the structure that applied superconductors to the neutral line of a transformer and applied the normal conductors to the third line. The superconductor applied to the neutral line of a transformer limited the peak value of initial fault current, while the normal conductor finally limited the fault current. In order to secure the operating reliability of transformer type Superconducting Fault Current Limiter (SFCL) of previously proposed structure, we analyzed the operating characteristics according to the fault types. We tested a line-to-ground fault and a line-to-line fault. As a result of the experiment, all the faults showed that the superconductor stably limited the peak-value of initial fault current. Also, the normal conductor finally limited the fault current. Based on this research results, We thought that if the structure of inserting superconductor into the neutral line is applied to the real system, it could improve the reliability and stability of the power system.
Operational Characteristics of the FCL Using the Mechanical Contact in the Power System
Jung, Byung-Ik ; Choi, Hyo-Sang ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 5, 2016, Pages 878~882
DOI : 10.5370/KIEE.2016.65.5.878
These days, SFCLs are being developed in order to limit fault current. However, the superconducting elements that limit the fault current have such problems as capacity increase and require auxiliary devices including cooling device. If devices that comprise the current power network can withstand fault current for at least one cycle, it is possible to limit the fault current with current limiting elements by bypassing it on the fault line. In this study, the fault current limiter was configured with current transformer, vacuum interrupter, and current limiting element. Through the experience, it was confirmed that the fault current was limited within one cycle. The superconducting element, as a current limiting element, limited the fault current by 80 % within one cycle from fault occurrence, and the passive element limited it more than 95 %. Also, through the comparison between resistance curve and power consumption curve, it was confirmed that the current limiting element using a passive element was more stable than the superconducting element that required capacity increase and other auxiliary devices. It was considered that the FCL proposed in this study could limit fault current stably within one cycle from fault occurrence by using the existing power technologies such as fault current detection and solenoid valve operating circuit.
Modeling and Simulation Reactive Power Compensator using Multi-port Network Algorithm in Electrified Railway
Kim, Joorak ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 5, 2016, Pages 883~887
DOI : 10.5370/KIEE.2016.65.5.883
The power supply system in Korean electrified railway has adopted AT feeding. If a fault occurs in some substation for any reason, the vicinity substation must feed electric power on the outage substation through catenary. So, the feeding distance grows twice of the normal state at extended feeding condition. If substation's feeding distance is longer than normal condition, the catenary impedance and train to supply electric power from the substation. Therefore, the severe voltage drop can occur and power supply shall be not allowed. This paper presents the model of compensator against voltage drop using multi-port network algorithm. Whole traction power supply system can be analyzed with this model. Computer simulation including this model is performed based on real train schedule and increased schedule in case studies.
Rail Profile Matching Method using ICP Algorithm
Yu, Young-Ki ; Koo, Ja-Myung ; Oh, Min-Soo ; Yang, Il-Dong ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 5, 2016, Pages 888~894
DOI : 10.5370/KIEE.2016.65.5.888
In this paper, we describe a method for precisely measuring the abrasion of the railway using an image processing technique. To calculate the wear of the rails, we provided a method for accurately matching the standard rail profile data and the profile data acquired by the rail inspection vehicle. After the lens distortion correction and the perspective transformation of the measured profile data, we used ICP Algorithm for accurate profile data matching with the reference profile extracted from the standard rail drawing. We constructed the prototype of the Rail Profile Measurement System for High-speed Railway and the experimental result on the three type of the standard rail used in Korea showed the excellent profile matching accuracy within 0.1mm.
Performance Evaluation of Wheel Detection Sensor Using an Inductive Proximity Sensor for The High Speed Railway
Lee, Kwang-Hee ; Lee, Jong-Hyun ; Suh, Ki-Bum ; Yoon, Suk-Han ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 5, 2016, Pages 895~901
DOI : 10.5370/KIEE.2016.65.5.895
Nowadays, the axle counter has been developed to the wide range of the track circuit blocks as well as the wheel detection device. The axle counter, as becoming an important device for the high speed railway, must be guaranteed in accordance with the safety. With considering the safety and the high speed, performance evaluation a wheel detection sensor is described in this paper. To increase the safety, digital proximity sensor instead of analog is employed in the wheel detection sensor. Therefor the wheel detection sensor can minimize noisy signals caused by the harsh railway environments. And, to meet the high speed railway requirements, the performance of the wheel detection sensor is also successfully verified using the speed simulator at the velocity 500Km/h.
The Overall Measurement System Development for On-line Test of Super-speed Maglev Train
Han, Young-Jae ; Lee, Jin-Ho ; Jo, Jung-Min ; Kim, Lee-Hyung ; Lee, Chang-Young ; Ha, Chang-Wan ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 5, 2016, Pages 902~910
DOI : 10.5370/KIEE.2016.65.5.902
This paper presents the overall measurement system for on-line test of super-speed maglev train. The super-speed maglev train is composed of vehicle, propulsion, power, and so on. In order to evaluate and diagnose for sub-system, we made overall measurement system. Just like the other measurement system, it is designed to distributed type. The hardware is consist of SCXI, PXI, Terminal, UPS, and so forth. It is installed on a train, control room, power room and track to collect lots of signals. The software controls hardware system, monitors main data such as inverter current, converter voltage. Using the measurement system, we evaluated a lot of performances for vehicle, track, and so forth. Through the developed system have improved reliability and safety for super-speed maglev train.