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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
Journal Basic Information
Journal DOI :
The Korean Institute of Electrical Engineers
Editor in Chief :
Volume & Issues
Volume 63, Issue 12 - Dec 2014
Volume 63, Issue 11 - Nov 2014
Volume 63, Issue 10 - Oct 2014
Volume 63, Issue 9 - Sep 2014
Volume 63, Issue 8 - Aug 2014
Volume 63, Issue 7 - Jul 2014
Volume 63, Issue 6 - Jun 2014
Volume 63, Issue 5 - May 2014
Volume 63, Issue 4 - Apr 2014
Volume 63, Issue 3 - Mar 2014
Volume 63, Issue 2 - Feb 2014
Volume 63, Issue 1 - Jan 2014
Selecting the target year
On UFR Settings Considering Wind Power Fluctuation In Jeju Island
Park, Min-Su ; Chun, Yeong-Han ; Byun, Sung-Hyun ; Yang, Jeong-Jae ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 4, 2014, Pages 445~450
DOI : 10.5370/KIEE.2014.63.4.445
Jeju power system is connected to the mainland power system through HVDC, and receives about half of required electricity through the HVDC lines. Jeju power system already experienced black out when a generator tripped at the moment of the HVDC line faults. But, UFR operated as was expected when HVDC line fault occurred at that time. As the penetration level of wind turbines increases, it is required to set UFR again considering intermittent wind turbin outputs. In this paper, we address a new way of UFR setting through computer simulation.
Development of Short-Term Load Forecasting Algorithm Using Hourly Temperature
Song, Kyung-Bin ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 4, 2014, Pages 451~454
DOI : 10.5370/KIEE.2014.63.4.451
Short-term load forecasting(STLF) for electric power demand is essential for stable power system operation and efficient power market operation. We improved STLF method by using hourly temperature as an input data. In order to using hourly temperature to STLF algorithm, we calculated temperature-electric power demand sensitivity through past actual data and combined this sensitivity to exponential smoothing method which is one of the STLF method. The proposed method is verified by case study for a week. The result of case study shows that the average percentage errors of the proposed load forecasting method are improved comparing with errors of the previous methods.
A Study on the Evaluation of the ESS Capacity of Considering for Charge-Discharge Characteristic and CO
Emission in Jeju
Ku, Bon-Hui ; Cha, Jun-Min ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 4, 2014, Pages 455~460
DOI : 10.5370/KIEE.2014.63.4.455
South Korea's power consumption is increasing every year. For stable electric power supply, more generation facilities are needed. But it is not easy to build nuclear power generation facilities, so provision of renewable energy is thought of as the solution. For the system's stable management, practical use of energy storing system is needed. Currently, pumping up electric power station is considered most useful. In this study, we have calculated the least amount of energy storing device by considering the renewable energy, HVDC, and change in power for the appliance of ESS in Jeju system, according to The 6th Basic Plan for Long-term Electricity Supply and Demand. Also we have calculated the amount of the battery and about the load equalizing effect to use battery as power storing device. Finally, we have calculated the reduction of electricity generation and the reduction of
emission with this study.
Proposal of A Novel Generator Efficiency Test Using The Shaft-Torque Method
Kim, Hyun-Han ; Ok, Yeon-Ho ; Kim, Kwang-Ho ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 4, 2014, Pages 461~468
DOI : 10.5370/KIEE.2014.63.4.461
An efficiency test for generators is generally required in case of construction of a new power plant or replacement of an existing generator. Generally, the efficiency of generator is measured by the input-output ratio under any given condition. Therefore, the best way is to directly measure the value of input and output power of a generator and calculate the efficiency values. However, it is difficult to measure a generator's input values accurately, especially for large systems. So, we are usually measuring the losses of the generator. But for measuring these values, there are several constraints for test such as preparing additional power generator and releasing the protection relay for manual operation of auxiliary equipments. Therefore, this study suggests that a novel generator efficient test method using the shaft-torque method which can be carried out while the generator is normally operating. The reliability of the result value was verified by comparing with the efficiency test results of the conventional retardation method on IEEE Std 115-1995.
PM Magnetization Characteristics Analysis of a Post-Assembly Line Start Permanent Magnet Motor using coupled Preisach Modeling and Finite Element Method
Rha, Young-Gak ; Lee, Jung-Ho ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 4, 2014, Pages 469~475
DOI : 10.5370/KIEE.2014.63.4.469
This paper deals with the characteristics evaluations of PM magnetization using stator coil in a Post-Assembly Line Start Permanent Magnet Motor (LSPMM) using a coupled Finite Element Method (FEM) and Preisach modeling, which is presented to analyze the magnetic characteristics of permanent magnets. The focus of this paper is the characteristics analysis relative to magnetizing direction and quantity of permanent magnets due to the eddy current occurring in the rotor bar during magnetization of Nd-Fe-B.
Operational Characteristic Analysis of Bipolar DC Distribution System using Hardware Simulator
Lee, Jin-Gyu ; Lee, Yoon-Seok ; Kim, Jae-Hyuk ; Han, Byung-Moon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 4, 2014, Pages 476~483
DOI : 10.5370/KIEE.2014.63.4.476
This paper describes the operational analysis results of the bipolar DC distribution system coupled with the distributed generators. The energy management for AC/DC power trade and the operational principle of distributed generators and energy storages were first analyzed by computer simulation with PSCAD/EMTDC software. After then a hardware simulator for the bipolar DC distribution system was built, which is composed of the grid-tied three-level inverter, battery storage, super-capacitor storage, and the voltage balancer. Various experiments with the hardware simulator were carried out to verify the operation of bipolar DC distribution system. The developed simulator has an upper-level controller which operates in connection with the controllers for each distributed generator and the battery energy storage based on CAN communication. The developed hardware simulator are possible to use in designing the bipolar DC distribution system and analyzing its performance experimentally.
A Study on the Cuf-off Speed of Small-scale Wind Power System for Battery Charging
Ku, Hyun-Keun ; Lee, Hyung-Uk ; Kim, Jang-Mok ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 4, 2014, Pages 484~489
DOI : 10.5370/KIEE.2014.63.4.484
Three phase PWM(Pulse Width Modulation) converter of the small-scale wind power system is able to charge battery under the rated wind speed regions. However, it is impossible to control output power of converter at the over win speed region because back-EMF(Electro Motive Force) of PMSG(Permanent Magnet Synchronous Generator) is higher than the battery terminal voltage of PMSG is reduced. However, the cut-off wind speed exists although battery charging algorithm is implemented by flux weakening control method. Therefore, this paper performs analysis of other factors which affects limitation wind speed. The validity of the analysis are verified through simulation.
A Design of High-speed Power-off Circuit and Analysis
Jeong, Sang-Hun ; Lee, Nam-Ho ; Cho, Seong-Ik ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 4, 2014, Pages 490~494
DOI : 10.5370/KIEE.2014.63.4.490
In this paper, a design of high-speed power-off circuit and analysis. The incidence of high-dose transient radiation into the silicon-based semiconductor element induces the photocurrent due to the creation of electron-hole pairs, which causes the upset phenomenon of active elements or triggers the parasitic thyristor in the element, resulting in latch-up. High speed power-off circuit was designed to prevent burn-out of electronic device caused by Latch-up. The proposed high speed power-off circuit was configured with the darlington transistor and photocoupler so that the power was interrupted and recovered without the need for an additional circuit, in order to improve the existing problem of SCR off when using the thyristor. The discharge speed of the high speed power interruption circuit was measured to be 19
load, which was 98% shorter than before (12.8 ms).
A Study on a Highly Sensitive Strain Sensor based on Rayleigh Wave
Lee, Ki Jung ; Jo, Minuk ; Fu, Chen ; Eun, Kyoungtae ; Oh, Haekwan ; Choa, Sung-Hoon ; Yang, Sang Sik ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 4, 2014, Pages 495~501
DOI : 10.5370/KIEE.2014.63.4.495
Piezoresistive-type, capacitive-type, and optical-type sensors have mainly been used for measuring a strain. However, in building a sensor network for remote monitoring using these conventional sensors there are disadvantages such as the complexity of a measuring system including wireless communication circuitry and high cost. In this paper, we demonstrates a highly-sensitive surface acoustic wave (SAW) strain sensor which is advantageous to harsh environments and wireless network. We designed and fabricated the SAW strain sensor. The SAW strain sensor attached on a specimen was tested with a tensile tester. The strain on the sensor surface was measured with a commercial strain gauge and compared with that obtained from strain analysis. The central frequency shift of the SAW sensor was measured with a network analyzer. The sensitivity of the SAW strain sensor is 134
which is high compared to previous results.
Filtering for a Class of Nonlinear Systems with Interval Time-varying Delay
Lee, Sangmoon ; Liu, Yajuan ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 4, 2014, Pages 502~508
DOI : 10.5370/KIEE.2014.63.4.502
In this paper, a delay-dependent
filtering problem is investigated for discrete-time delayed nonlinear systems which include a more general sector nonlinear function instead of employing the commonly used Lipschitz-type function. By using the Lyapunov-Krasovskii functional approach, a less conservative sufficient condition is established for the existence of the desired filter, and then, the corresponding solvability condition guarantee the stability of the filter with a prescribed
performance level. Finally, two simulation examples are given to show the effectiveness of the proposed filtering scheme.
Tuning PID Controllers for Unstable Systems with Dead Time based on Dual-Input Describing Function(DIDF) Method
Choe, YeonWook ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 4, 2014, Pages 509~518
DOI : 10.5370/KIEE.2014.63.4.509
Though various techniques have been studied as a way of adjusting parameters of PID controllers, no perfect method of determining parameters is available to date. Especially the deign of PID controller for unstable processes with dead time(UPWDT) is even more difficult due to various reasons. Generally the existing design procedures for UPWDT involve deriving formulas to meet gain and phase margin specifications, or using inner loop to stabilize UPWDT before applying PID controller. In this paper, the dual-input describing function(DIDF) method is proposed, by which the performance and robustness of the closed-loop system can be improved. The method is based on moving the critical point (-1+j0) of Nyquist stability to a new position arbitrarily selected on the complex plane. This can be done by determining appropriate coefficients of the DIDF. As a result, we can easily determine parameters of PID-type controller by using existing conventional tuning methods for stable or unstable systems. Simulation results are included to show the effectiveness of the proposed method.
A Variable Structure Point-to-Point Regulation Controller for Uncertain General Linear Systems
Lee, Jung-Hoon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 4, 2014, Pages 519~525
DOI : 10.5370/KIEE.2014.63.4.519
In this paper, an alternative variable structure controller is designed for the point-to-point regulation control of uncertain general linear plants so that the output of plants can be controlled from an arbitrarily given initial point to an arbitrarily given reference point in the state space. By using the error between the steady state value of the output and an arbitrarily given reference point and those integral, a transformed integral sliding surface is defined, in advance, as the surface from an initial state to an arbitrarily given reference point without the reaching phase problems. A corresponding control input is suggested to satisfy the existence condition of the sliding mode on the preselected transformed integral sliding surface against matched uncertainties and disturbances. Therefore, the output controlled by the proposed controller is completely robust and identical to that of the preselected transformed integral sliding surface. Through an example, the effectiveness of the suggested controller is verified.
A Study on Heavy Rainfall Guidance Realized with the Aid of Neuro-Fuzzy and SVR Algorithm Using AWS Data
Kim, Hyun-Myung ; Oh, Sung-Kwun ; Kim, Yong-Hyuk ; Lee, Yong-Hee ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 4, 2014, Pages 526~533
DOI : 10.5370/KIEE.2014.63.4.526
In this study, we introduce design methodology to develop a guidance for issuing heavy rainfall warning by using both RBFNNs(Radial basis function neural networks) and SVR(Support vector regression) model, and then carry out the comparative studies between two pattern classifiers. Individual classifiers are designed as architecture realized with the aid of optimization and pre-processing algorithm. Because the predictive performance of the existing heavy rainfall forecast system is commonly affected from diverse processing techniques of meteorological data, under-sampling method as the pre-processing method of input data is used, and also data discretization and feature extraction method for SVR and FCM clustering and PSO method for RBFNNs are exploited respectively. The observed data, AWS(Automatic weather wtation), supplied from KMA(korea meteorological administration), is used for training and testing of the proposed classifiers. The proposed classifiers offer the related information to issue a heavy rain warning in advance before 1 to 3 hours by using the selected meteorological data and the cumulated precipitation amount accumulated for 1 to 12 hours from AWS data. For performance evaluation of each classifier, ETS(Equitable Threat Score) method is used as standard verification method for predictive ability. Through the comparative studies of two classifiers, neuro-fuzzy method is effectively used for improved performance and to show stable predictive result of guidance to issue heavy rainfall warning.
The Design of Pattern Classification based on Fuzzy Combined Polynomial Neural Network
Rho, Seok-Beom ; Jang, Kyung-Won ; Ahn, Tae-Chon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 4, 2014, Pages 534~540
DOI : 10.5370/KIEE.2014.63.4.534
In this paper, we propose a fuzzy combined Polynomial Neural Network(PNN) for pattern classification. The fuzzy combined PNN comes from the generic TSK fuzzy model with several linear polynomial as the consequent part and is the expanded version of the fuzzy model. The proposed pattern classifier has the polynomial neural networks as the consequent part, instead of the general linear polynomial. PNNs are implemented by stacking the simple polynomials dynamically. To implement one layer of PNNs, the various types of simple polynomials are used so that PNNs have flexibility and versatility. Although the structural complexity of the implemented PNNs is high, the PNNs become a high order-multi input polynomial finally. To estimate the coefficients of a polynomial neuron, The weighted linear discriminant analysis. The output of fuzzy rule system with PNNs as the consequent part is the linear combination of the output of several PNNs. To evaluate the classification ability of the proposed pattern classifier, we make some experiments with several machine learning data sets.
Effective Gait Imbalance Judgment Method based on Thigh Location
Kim, Seojun ; Kim, Yoohyun ; Shim, Hyeonmin ; Lee, Sangmin ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 4, 2014, Pages 541~545
DOI : 10.5370/KIEE.2014.63.4.541
In this paper, the angle of the thighs that appear during walking condition to balance estimation to the left and right leg was occurred during normal walking. Get over to the limitations of gait analysis using image processing or foot pressure that was used a lot in the previous, the angle of the thigh were used for estimation of asymmetric gait. We implemented heathy five adult male to test targeting and gait and obtained cycle data from 10 times. For this research, Thigh-Angle measurement device were developed, and attached to in a position of
for flexion and
for extension to measure the angle of the thigh. Also, in order to verify the reliability of estimation of asymmetric gait using thigh-angle, it was compared with the result of asymmetric gait estimation using foot pressure. The results of this paper, using the thigh angle is the average of 16.84% higher than using pressure to accuracy of determine the gait imbalance.
Design of 8 Channel Insertional pTx Array Coil for 3T Body Imaging
Kim, Young Beom ; Ryu, Yeunchul ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 4, 2014, Pages 546~550
DOI : 10.5370/KIEE.2014.63.4.546
In this research, we report all the elements are placed in the space above the patient table as a transmit coil to give optimized B1+ field for the body object. Through the simulations, we compared upper-and-lower parts combined 8 channel Tx array to upper only 8 channel Tx array and showed the utilities of B1+ shimming in multi-channel Tx body imaging at 3T. Half-cylinder shaped upper array shows weak B1+ field area around back of patient without B1+ shimming. After B1+ shimming, highly induced SAR places occurred in the arm region due to the close distance to the both end elements which were driven by very high RF current to enhance B1+ in back area. The proposed upper and lower combined array provides an enhanced homogeneous B1+ field in large ROI imaging as a result of shimming over the body size phantom. Through this research we proved the usefulness of the proposed insertional upper and lower parts combined transmit array for 3T body imaging.
Baseline Drift Reduction and Suppression of Power Line Noises in ECG Signal by Designing Multirate Digital Filter
Kim, Jeong-Hwan ; Kim, Hyun-Tae ; Park, Sang-Eun ; Lee, Jeong-Whan ; Kim, Kyeong-Seop ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 4, 2014, Pages 551~558
DOI : 10.5370/KIEE.2014.63.4.551
Baseline drift reduction and removal of power line noises in electrocardiogram are often necessary to avoid the distortions in extracting the fiducial features. With this aim, the multirate digital filtering algorithm is suggested to design and implement Finite Impulse Response or Infinite Impulse Response Filter by changing the sampling rate with omitting or interpolating intermediate ECG data. After the experimental simulations performed, we can conclude the fact that we can suppress the baseline wander and power line disturbances in ECG signal with reducing the computational complexities in which we do not keep the original and high sampling frequency.
Implementation of Two TMS320F28335 based BESS Controllers for Microgrid and Control Performance Test in the Hardware-in-the-Loop Simulation System
Kim, Nam-Dae ; Yoo, Hyeong-Jun ; Kim, Hak-Man ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 4, 2014, Pages 559~564
DOI : 10.5370/KIEE.2014.63.4.559
A microgrid as a small scale power system is operated by the grid-connected mode and islanded mode. It is anticipated that the battery energy storage system (BESS) is able to be applied to the microgrid for stable power control, such as tie-line and smoothing control in the grid-connected mode and voltage and frequency control in the islanded mode. In this paper, a digital signal processor (DSP), Two BESS controllers based on TMS320F28335 of a microgrid are implemented and are tested to show control performance in the hardware-in-the loop simulation (HILS) system.
A Study on Implementing Kinect-Based Control for LCD Display Contents
Rho, Jungkyu ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 4, 2014, Pages 565~569
DOI : 10.5370/KIEE.2014.63.4.565
Recently, various kinds of new computer controlled devices have been introduced in a wide range of areas, and convenient user interfaces for controlling the devices are strongly needed. To implement natural user interfaces(NUIs) on top of the devices, new technologies like a touch screen, Wii Remote, wearable interfaces, and Microsoft Kinect were presented. This paper presents a natural and intuitive gesture-based model for controlling contents of LCD display. Microsoft Kinect sensor and its SDK are used to recognize human gestures, and the gestures are interpreted into corresponding commands to be executed. A command dispatch model is also proposed in order to handle the commands more naturally. I expect the proposed interface can be used in various fields, including display contents control.
A Study on a Ultra-wide-angle Wireless Digital Electronic Endoscope Modules
Shim, Dongha ; Kim, Hyung-O ; Lee, Bong-Ju ; Hong, Seung-Cheol ; Lee, Jason ; Cha, Jaesang ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 4, 2014, Pages 570~574
DOI : 10.5370/KIEE.2014.63.4.570
This paper proposes a wireless digital endoscope with a ultra-wide-angle view. Two key components are implemented to demonstrate the feasibility of the proposed endoscope. First, a ultra-wide-angle lens module with the field of view of 144 degree and F-number of 2.2 is designed and manufactured. Second, a wireless module for a high-speed video transfer is implemented using a USB device server and wireless LAN router. The wireless module can directly transfer a streaming video to a computer with the resolution of 1920x1080, frame rate of 30 fps, and data rate of 53.3 Mbps without an internet connection. Since the wireless module supports two USB devices, two spots can be simultaneously observed using the proposed endoscope.
Modeling and Analysis of 7-Phase BLDC Motor Drives
Song, Sang-Hoon ; Yoon, Yong-Ho ; Lee, Byoung-Kuk ; Won, Chung-Yuen ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 4, 2014, Pages 575~582
DOI : 10.5370/KIEE.2014.63.4.575
In this paper, a simulation model for 7-phase BLDC motor drives for an Autonomous Underwater Vehicles (AUV) is proposed. A 7-phase BLDC motor is designed and the electrical characteristics are analyzed using FEA program and the power electronics drives for the 7-phase BLDC motor are theoretically analyzed and the actual implementation has been accomplished using Matlab Simulink. PI controller is used for verifying the validity of the proposed model and the informative results are described in detail.
The Application of Standard in According to Ground and Electrical Continuity Testing of Lightning Protection Equipment in Field
Song, Gil-Mok ; Koo, Kyung-Wan ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 4, 2014, Pages 583~588
DOI : 10.5370/KIEE.2014.63.4.583
In this study, there are examined to the grounding of lightning protection system and electrical continuity tests in the field. The standard for lightning protection system is different design or construction according to the characteristics of the structure. Ground is measured and compared at least four locations. According to the measured results in the field, the sampled values of the ground resistance are measured
or less and the difference between each value is suitable as
or less. The values of the electrical continuity test between ground and metal bodies are measured 3 groups such as isolated portion, the mechanical contacted portion, and the electrical continuity portion measuring
or less. It is measured to be less than
at all in metal bodies of underground. A metal body installed inside the structure is not isolated, but the resistance values are higher than
. Therefore, It must be carried out the structure having lightning protection system confirm the LPL(lightning protection level) and design the strategy.
Development of Automatic Evaluation Equipment for Burden of Instrument Transformer using Resistor Simulator
Lee, Young Seob ; Jung, Jae Kap ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 4, 2014, Pages 589~595
DOI : 10.5370/KIEE.2014.63.4.589
The error of instrument transformers is measured by connecting the external burden with the secondary terminal of the instrument transformers. Because the error of transformer is affected by the apparent power and power factor of the external burden, an accurate measurement of burden is important for transformer evaluation. We have developed the burden evaluation equipment for both potential transformer and current transformer by employing the series resistor in the range of
and the parallel resistor in the range of
, respectively, together with visual basic program. We could reduce testing time more than 5 times by employing method developed in this study, compared with that developed in past. This method shows more better reliability by analyzing the evaluation results and fitting graphs of burden measurements. The test results of the developed system is compared with those obtained in the power meter analyzer to verify the validity.