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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
Analysis on Installation Location of SFCL considering Current Rate of Circuit Breaker in a Power Transmission System
Park, Han-Min ; Kim, Jin-Seok ; Lim, Sung-Hun ; Kim, Jae-Chul ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 3, 2015, Pages 357~364
DOI : 10.5370/KIEE.2015.64.3.357
The power system configuration is changed to solve increasing power demand. This changes in power system configuration with mesh-, network grid generate the problem of fault current increase. Superconducting fault current limiter (SFCL) has been expected the one of the solutions to solve this problem. And there has already been reported much to the application and research of SFCL in the power distribution system. However, the application and research of SFCL are insufficient in a transmission power system. Also, the fault current limiting effect by the SFCL varies with installation location of SFCL. Therefore, this paper constructed the power transmission system through experiment and analyzed installation location method of SFCL using the current rate of each circuit breaker (CB) according to fault location.
A Study on the Implementation of Geographic Information System for an Intelligent Power Distribution Network with Location Informations of Power Line Communication-based Automatic Meter Reading System
Seo, Chung-Ki ; Lee, Seung-Gol ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 3, 2015, Pages 365~369
DOI : 10.5370/KIEE.2015.64.3.365
In this paper, geographic information system(GIS) for an intelligent power distribution network was implemented with location informations acquired from automatic meter reading system, where the location informations of power line communication(PLC) modems installed at customer side were collected at data concentration units(DCUs) of headend equipment via PLC and then were transmitted to front end processor server. By displaying the connection status of the power distribution network on GIS map, operation of advanced metering infrastructure(AMI) or management of power grid system could be performed intuitionally and in real time, because the configuration state of the power grid could be easily monitored. The feasibility of the proposed system was confirmed with the especially constructed laboratory-level test bed and the verification test of the system will be carried out for a real power distribution network.
Development of power system stabilization program using optimization method
Ahn, Chang-Han ; Baek, Young-Sik ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 3, 2015, Pages 370~374
DOI : 10.5370/KIEE.2015.64.3.370
Various protective equiptments are used for the power system control and protection. Numerous facilities are monitored at the same time in real time and introduction of optimization method and analysis of the method are required for generation control and facility management considering the demand fluctuations. However, the existing system analysis programs are difficult to link with the other sw and there are some problems with user convenience. To solve these problems the present conditions of the system are figured out in real time and the equipment insert method was estimated by optimization method, and the system that showed the system analysis program is developed. PSS/E has been used as system anlysis program for stabilizing system development which applied the optimization. method and Python language is applied in order to link the input and output values with the DB automatically. Lastly, DLL of matlab has been made included in C++ for solving the objective function using opmization method.By linking this to DB, power flow was calculated in PSS/E and the result was represented by Intouch screen.
A Proposal of Institutional Prerequisites to the Participation of Virtual Power Plant in Electricity Market under the Smart Grid Paradigm
Chung, Koo-Hyung ; Park, Man-Geun ; Hur, Don ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 3, 2015, Pages 375~383
DOI : 10.5370/KIEE.2015.64.3.375
The virtual power plant (VPP) is a new technology to achieve flexibility as well as controllability, like traditional centralized power plants, by integrating and operating different types of distributed energy resources (DER) with the information communication technology (ICT). Though small-sized DERs may not be controlled in a centralized manner, these are more likely to be utilized as power plants for centralized dispatch and participate in the energy trade given that these are integrated into a unified generation profile and certain technical properties such as dispatch schedules, ramp rates, voltage control, and reserves are explicitly implemented. Unfortunately, the VPP has been in a conceptual stage thus far and its common definition has not yet been established. Such a lack of obvious guidelines for VPP may lead to a further challenge of coming up with the business model and reinforcing the investment and technical support for VPP. In this context, this paper would aim to identify the definition of VPP as a critical factor in smart grid and, at the same time, discuss the details required for VPP to actively take part in the electricity market under the smart grid paradigm.
An Economic Assessment of Large-scale Battery Energy Storage Systems in the Energy-Shift Application to Korea Power System
Park, Jong-Bae ; Park, Yong-Gi ; Roh, Jae-Hyung ; Chang, Byung-Hoon ; Toon, Yong-Beum ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 3, 2015, Pages 384~392
DOI : 10.5370/KIEE.2015.64.3.384
This paper presents an economic assessment of large-scale Li-ion battery energy storage systems applied to Korean power system. There are many applications of the battery energy storage systems (BESSs) and they can provide various benefits to power systems. We consider BESSs to the energy time-shift application to Korean power system and evaluate the benefits from the application of BESS in the social perspective. The mixed integer programming (MIP) algorithm is used to resolve the optimal operation schedule of the BESS. The social benefits can include the savings of the fuel cost from generating units, deferral effects of the generation capacity, delay of transmission and distribution infra construction, and incremental CO2 emission cost impacts, etc. The economic evaluation of the BESS is separately applied into Korean power systems of the Main-land and Jeju island to reflect the differences of the load and generation patterns.
PV Power Prediction Models for City Energy Management System based on Weather Forecast Information
Eum, Ji-Young ; Choi, Hyeong-Jin ; Cho, Soo-Hwan ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 3, 2015, Pages 393~398
DOI : 10.5370/KIEE.2015.64.3.393
City or Community-scale Energy Management System(CEMS) is used to reduce the total energy consumed in the city by arranging the energy resources efficiently at the planning stage and controlling them economically at the operating stage. Of the operational functions of the CEMS, generation forecasting of renewable energy resources is an essential feature for the effective supply scheduling. This is because it can develop daily operating schedules of controllable generators in the city (e.g. diesel turbine, micro-gas turbine, ESS, CHP and so on) in order to minimize the inflow of the external power supply system, considering the amount of power generated by the uncontrollable renewable energy resources. This paper is written to introduce numerical models for photo-voltaic power generation prediction based on the weather forecasting information. Unlike the conventional methods using the average radiation or average utilization rate, the proposed models are developed for CEMS applications using the realtime weather forecast information provided by the National Weather Service.
DC-link Voltage Control of HVDC for Offshore Wind Farm using Improved De-loading Method
Huh, Jae-Sun ; Moon, Won-Sik ; Park, Sang-In ; Kim, Doo-Hee ; Kim, Jae-Chul ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 3, 2015, Pages 399~404
DOI : 10.5370/KIEE.2015.64.3.399
This paper presents the DC voltage control method in DC link of High Voltage Direct Current(HVDC) for an offshore wind farm in Low Voltage Ride Through(LVRT) situation. Wind generators in an offshore wind farm are connected to onshore network via HVDC transmission. Due to LVRT control of grid side inverter in HVDC, power imbalancing in DC link is generated and this consequentially causes rising of DC voltage. A de-loading scheme is one of the method to protect the wind power system DC link capacitors from over voltage. But the flaw of this method is slow control response time and that it needs long recovery time to pre-fault condition after fault clear. Thus, this paper proposes improved de-loading method and we analyze control performance for DC voltage in LVRT control of HVDC for an offshore wind farm.
Design of a Switched Reluctance Generator for Small Wind Power Systems
Shin, Hye-Ung ; Lee, Kyo-Beum ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 3, 2015, Pages 405~410
DOI : 10.5370/KIEE.2015.64.3.405
This paper deals with the design method of 1kW-Switched Reluctance Generator (SRG) for wind power applications. The coefficient of the output equation is determined according to the purpose specification for design of SRG. Detailed design is carried out, after selecting the outer diameter of the rotor on the basis of the output equation. The generation characteristic of designed generator is verified by using Finite Element Method (FEM).
Thermal modeling and analysis of single phase LSPM
Ham, Sang-Hwan ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 3, 2015, Pages 411~416
DOI : 10.5370/KIEE.2015.64.3.411
This paper presents the thermal modeling and analysis of Line power Start Permanent magnet Motor (LSPM). Thermal analysis of electrical machines is important because temperatures that are consistently too high will reduce the life time of machines and may lead to serious failure. Coefficients of convection are calculated according to the types of operating conditions. And computational fluid dynamics (CFD) technique is performed in order to predict thermal characteristic. The results are compared to the test results.
Study on B-H Curve Characteristic of Magnetic Substance According to Tensile Stress
Kim, Jong-Wang ; Kim, Sang-Hyun ; Yang, Hoon-Suk ; Kim, Ji-Ho ; Jung, Hyun-Ju ; Lee, Hyang-Beom ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 3, 2015, Pages 417~421
DOI : 10.5370/KIEE.2015.64.3.417
In this paper, study for B-H curve characteristics of the magnetic material due to tensile stresses of submarine for magnetic silence. For the experiment, made the sample of the material of AH36 and made to a B-H curve Tracer. In addition, design and made a system of stress by the weight in order to apply a tensile stress, it was possible to obtain results for the change of the magnetization.
Fabrication of Microwave PECVD with Linear Antenna for large-scale deposition processing, and Analysis of Ar plasma characteristics using Electrostatic Probe and Temperature Characteristics
Han, Moon-Ki ; Seo, Kwon-Sang ; Kim, Dong-Hyun ; Lee, Ho-Jun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 3, 2015, Pages 422~428
DOI : 10.5370/KIEE.2015.64.3.422
A 2.45GHz microwave plasma source with a linear antenna has been developed for low temperature large scale deposition processing. Microwave power is transmitted through WR340 waveguide and a copper rod, linear antenna, is located in a quartz tube. The power matching is effectively achieved by a linear antenna is located at
from the end of WR340 waveguide. The Ar plasma was generated along the surface of quartz tube and a clear standing wave pattern with nearly 10cm wavelength was observed at Ar pressure of 200mTorr and 200W input power. The electron density and electron temperature were investigated by using the electrostatic probe. The electron density and electron temperature were highly measured near the surface of quartz tube. Ar plasma density along the quartz tube is mostly uniform despite standing wave set-up and antenna of long length. A uniform temperature was measured at 10~40cm distance from the end quartz tube and 5cm distance from the surface of quartz tube.
A New Medical Lead for Various MRI Systems
Kim, Hongjoon ; Yoo, Hyoungsuk ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 3, 2015, Pages 429~432
DOI : 10.5370/KIEE.2015.64.3.429
Radio Frequency (RF) coils in Magnetic Resonance Imaging (MRI) systems interact with a patient`s tissues, resulting in the absorption of RF energy by the tissues. The presence of an electrically conducting medical implant may concentrate the RF energy and causes tissue heating near the implant devices. Here we present a novel design for a medical lead to reduce this undesired heating. Specific Absorption Rate (SAR), an indicator of heating, was calculated. Remcom XFdtd software was used to calculate the peak SAR distribution (1g and 10 g) in a realistic model of the human body. The model contained a medical lead that was exposed to RF magnetic fields at 64 MHz (1.5 T MRI), 128 MHz (3 T MRI) and 300 MHz (7 T MRI) using a model of an MR birdcage body coil. Our results demonstrate that, our proposed design of adding nails to the medical lead can significantly reduce the SAR for different MRI systems.
A Low Power and High Linearity Up Down Converter for Wireless Repeater
Hong, Nam Pyo ; Kim, Kwang Jin ; Jang, Jong-Eun ; Chio, Young-Wan ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 3, 2015, Pages 433~437
DOI : 10.5370/KIEE.2015.64.3.433
We have designed and fabricated a low power and high linearity up down convertor for wireless repeaters using
SiGe Bipolar CMOS technology. Repeater is composed of a wideband up/down converting mixer, programmable gain amplifiers (PGA), input buffer, LO buffer, filter driver amplifier and integer-N phase locked loop (PLL). As of the measurement results, OIP3 of the down conversion mixer and up conversion mixer are 32 dBm and 17.8 dBm, respectively. The total dynamic gain range is 31 dB with 1 dB gain step resolution. The adjacent channel leakage ratio (ACLR) is 59.9 dBc. The total power consumption is 240 mA at 3.3 V.
Phased Array Behavior of the Coupling of the Millimeter Wave Second Harmonic Oscillator
Choi, Young-Kyu ; Kim, Gi-Rae ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 3, 2015, Pages 438~444
DOI : 10.5370/KIEE.2015.64.3.438
A new approach to the active phased arrays for the second harmonic generation is presented. Phase variation between the second harmonic oscillators by the mutual synchronization is analyzed theoretically. In this coupling, the active antenna consists of the FET oscillator which plays two roles in fundamental oscillation and frequency multiplying, and the patch antenna resonated at the second harmonic frequency. The radiated second harmonic wave was scanned by varying the free-running oscillation frequencies of the active antennas. In the experiment using the 2-elements array and the 4-elements array, the radiated beam of the second harmonic wave was scanned more widely compared with the case of the fundamental wave radiation.
TDOA Based Moving Target Velocity Estimation in Sensor Network
Kim, Yong Hwi ; Park, Min Soo ; Park, Jin Bae ; Yoon, Tae Sung ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 3, 2015, Pages 445~450
DOI : 10.5370/KIEE.2015.64.3.445
In the moving target problem, the velocity information of the moving target is very important as well as the high accuracy position information. To solve this problem, active researches are being conducted recently with combine the Time Difference of Arrival (TDOA) and Frequency Delay of Arrival(FDOA) measurements. However, since the FDOA measurement is utilizing the Doppler effect due to the relative velocity between the target source and the receiver sensor, it may be difficult to use the FDOA measurement if the moving target speed is not sufficiently fast. In this paper, we propose a method for estimating the position and the velocities of the target by using only the TDOA measurements for the low speed moving target in the indoor environment with sensor network. First, the target position and heading angle are obtained from the estimated positions of two attached transmitters on the target. Then, the target angular and linear velocities are also estimated. In addtion, we apply the Instrumental Variable (IV) technique to compensate the estimation error of the estimated target velocity. In simulation, the performance of the proposed algorithm is verified.
Design of Nonlinear Observer for Flexible Joint Manipulator with Nonlinear Stiffness Based on Acceleration
Lee, Seung-Joon ; Kim, Hyungjong ; Nam, Kyung-Tae ; Kuc, Tai-Young ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 3, 2015, Pages 451~457
DOI : 10.5370/KIEE.2015.64.3.451
In this paper, we consider the observer design problem that truly reflects the nonlinear stiffness of the manipulators. The two key ideas of our design are that (a) estimation error dynamics of the manipulator equipped with accelerometer dose not dependent on nonlinearities at the link part, when the measured signals are the motor position and the output of the accelerometer and (b) the nonlinear stiffness is indeed a Lipschitz function. In order to effectively compensate the nonlinear stiffness, the gain of the proposed observer is carefully chosen from the ARE(algebraic Riccati equations) which depend on Lipschitz constant. Comparative simulation result verifies the effectiveness of the proposed solution.
Low-Complexity Handheld 3-D Scanner Using a Laser Pointer
Lee, Kyungme ; Lee, Yeonkyung ; Park, Doyoung ; Yoo, Hoon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 3, 2015, Pages 458~464
DOI : 10.5370/KIEE.2015.64.3.458
This paper proposes a portable 3-D scanning technique using a laser pointer. 3-D scanning is a process that acquires surface information from an 3-D object. There have been many studies on 3-D scanning. The methods of 3-D scanning are summarized into some methods based on multiple cameras, line lasers, and light pattern recognition. However, those methods has major disadvantages of their high cost and big size for portable appliances such as smartphones and digital cameras. In this paper, a 3-D scanning system using a low-cost and small-sized laser pointer are introduced to solve the problems. To do so, we propose a 3-D localization technique for a laser point. The proposed method consists of two main parts; one is a fast recognition of input images to obtain 2-D information of a point laser and the other is calibration based on the least-squares technique to calculate the 3-D information overall. To verified our method, we carry out experiments. It is proved that the proposed method provides 3-D surface information although the system is constructed by extremely low-cost parts such a chip laser pointer, compared to existing methods. Also, the method can be implemented in small-size; thus, it is enough to use in mobile devices such as smartphones.
Visual Touch Recognition for NUI Using Voronoi-Tessellation Algorithm
Kim, Sung Kwan ; Joo, Young Hoon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 3, 2015, Pages 465~472
DOI : 10.5370/KIEE.2015.64.3.465
This paper presents a visual touch recognition for NUI(Natural User Interface) using Voronoi-tessellation algorithm. The proposed algorithms are three parts as follows: hand region extraction, hand feature point extraction, visual-touch recognition. To improve the robustness of hand region extraction, we propose RGB/HSI color model, Canny edge detection algorithm, and use of spatial frequency information. In addition, to improve the accuracy of the recognition of hand feature point extraction, we propose the use of Douglas Peucker algorithm, Also, to recognize the visual touch, we propose the use of the Voronoi-tessellation algorithm. Finally, we demonstrate the feasibility and applicability of the proposed algorithms through some experiments.
Improving Motor Protection Using Thermal Model
Chang, Choong-Koo ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 3, 2015, Pages 473~479
DOI : 10.5370/KIEE.2015.64.3.473
Thermal relays are sometimes used instead of long time overcurrent relays for motor protection. But, it is difficult for any relay design engineer to adequately approximate motor heating curves which represent the average of a difficult-to-define thermal zone. Thermal relays frequently may not provide sufficient protection on heavy overloads. Digital multifunction relays are microprocessor-based devices. These relays offer highly reliable and advanced protection of motors. If a situation can be mathematically described, the microprocessor in a digital relay can be programmed to tackle that problem. Today`s motor protection is accomplished with digital protective relays. Digital relays offer additional, highly important features to complement protection. The best way to prevent short in motor is to not overheat and degrade the insulation.
Development Of Power Information Management System For Customer Power Manager and Consumer Participation Type Oriented
Jung, Hyung-Yong ; Yoo, Sang-Bong ; Lee, Ki-Chul ; Lee, Cheo-Jick ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 3, 2015, Pages 480~484
DOI : 10.5370/KIEE.2015.64.3.480
As the increasing national power crises due to various environmental factor, power market change is needed more developed and systemized DSM(Demand Side Management) search at DR market. To overcome national power crisis outbreaking every year and manage the eletric power reserve ratio, we need to construct and develop the electric safety manager and general public main oriented national power plant. For the advanced national power demand management system, it is required the application development like OpenAPI, Big Data Acquisition, Web/APP basd on ICT.
Performance verification and improvement of the frequency analysis unit for GIS Preventive & Diagnostic Monitoring System
Kim, Won-Gyu ; Kim, Min-Soo ; Baek, Young-Sik ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 3, 2015, Pages 485~491
DOI : 10.5370/KIEE.2015.64.3.485
This paper shows the design improvement and test model of FAU (Frequency Analysis Unit) in PDD (Partial Discharge Diagnosis system) for 800kV GIS (Gas Insulated Switchgear). We found some problems during operation of previous FAU, such as the aging of fiber-optic converter that can cause communication error, the malfunction of signal analysis circuit etc. And then we solved those problems by design improvement and verified the performance through type test. To monitor partial discharge, the performance of UHF sensor is important but the performance of frequency analysis unit is also very important. So we solved communication error, the malfunction of signal analysis circuit and then increased the operation reliability of FAU by improving fiber-optic converter and signal analysis circuit. Accredited testing laboratory carried out the performance verification test according to performance test criteria and procedure of reliability test standards, IEC-60225, 61000 and 60068 etc. We confirmed the test results which correspond with the performance test criteria.
A Study on Characteristics of Overhead Rigid Conductor System for Developing the High-speed System up to 250km/h
Bae, Sang-Joon ; Jang, Kwang-Dong ; Lee, Ki-Won ; Park, Youn-Cheol ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 3, 2015, Pages 492~497
DOI : 10.5370/KIEE.2015.64.3.492
An overhead rigid conductor system is mainly applied to the subway and recently studies on the rigid system have been conducted for applications such as tunnels of high-speed line and speed improvement of a conventional lines up to 250km/h. Power feeding performance which is the most important in a rigid system can be measured by contact force and characteristics of this contact force are related to the shape and material of the R-BAR. In this paper, we analyze the measurements of contact force, current heating temperature, impedance of a rigid conductor which was developed in Korea, after that we compare static characteristics of home and abroad rigid conductors which have various shapes and materials.
Fault Detection of Low Voltage Cable using Time-Frequency Correlation in SSTDR
Jeon, Jeong-Chay ; Kim, Taek-Hee ; Yoo, Jae-Geun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 3, 2015, Pages 498~504
DOI : 10.5370/KIEE.2015.64.3.498
This paper proposed an Spread Spectrum Time Domain Reflectometry (SSTDR) using time-frequency correlation analysis in order to have more accurate fault determination and location detection than classical SSTDR despite increased signal attenuation due to the long distance to cable fault location. The proposed method was validated through comparison with classical SSTDR methods in open- and short-circuit fault detection experiments of low-voltage power cables. The experimental results showed that the proposed method can detect correlation coefficients at fault locations accurately despite reflected signal attenuation so that cable faults can be detected more accurately and clearly in comparison to existing methods.