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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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The Transactions of The Korean Institute of Electrical Engineers
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Journal DOI :
The Korean Institute of Electrical Engineers
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Volume & Issues
Volume 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
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Analysis of Turbine-Generator Shaft System Mechanical Torque Response based on Turbine Blade Modeling
Park, Ji-Kyung ; Chung, Se-Jin ; Kim, Chul-Hwan ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 9, 2015, Pages 1269~1275
DOI : 10.5370/KIEE.2015.64.9.1269
Turbine-generator torsional response is caused by interaction between electrical transient air-gap torque and mechanical characteristics of turbine-generator shafts. There are various factors that affects torsional interaction such as fault, circuit breaker switching and generator mal-synchronizing, etc. Fortunately, we can easily simulate above torsional interaction phenomena by using ElectroMagnetic Transient Program (EMTP). However, conventional EMTP shows the incomplete response of super- synchronous torsional mode since it does not consider turbine blade section. Therefore, in this paper, we introduced mechanical-electrical analogy for detailed modeling of turbine-generator shaft system including low pressure turbine blade section. In addition, we derived the natural frequencies of modeled turbine-generator shaft system including turbine blade section and analyzed the characteristics of mechanical torque response at shaft coupling and turbine blade root area according to power system balanced/unbalanced faults.
The Effect of Changes of the Housing Type on Long-Term Load Forecasting
Kim, Sung-Yul ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 9, 2015, Pages 1276~1280
DOI : 10.5370/KIEE.2015.64.9.1276
Among the various statistical factors for South Korea, the population has been steadily decreased by lower birthrate. Nevertheless, the number of household is constantly increasing amid population aging and single life style. In general, residential electricity use is more the result of the number of household than the population. Therefore, residential electricity consumption is expected to be far higher for decades to come. The existing long-term load forecasting, however, do not necessarily reflect the growth of single and two-member households. In this respect, this paper proposes the long-term load forecasting for residential users considering the effect of changes of the housing type, and in the case study the changes of the residential load pattern is analyzed for accurate long-term load forecasting.
Comparison of The Attenuation Measurement Methods for Electromagnetic Partial Discharge Signal in 25.8 kV Gas Insulated Switchgear
Goo, Sun-Geun ; Han, Ki-Sun ; Kwak, Joo-Sik ; Joo, Hyung-Jun ; Jeong, Moon-Gyu ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 9, 2015, Pages 1281~1287
DOI : 10.5370/KIEE.2015.64.9.1281
We report the characteristics and differences of two types of attenuation measurement methods for electromagnetic partial discharge signal in GIS. The pulse method is to measure the attenuated waveforms in time domain and coverts them into frequency domain to get the attenuation spectra of given GIS section. This method simulates the real partial discharge signal. The frequency swept continuous wave method can obtain attenuation spectra directly so that it gives attenuation with low noise floor and simplicity. We show that both methods are effective and exchangeable because the attenuation results measured by two methods have similar trends
A Study on the Design of Triple-tuned Filter for Line Commutated Converter HVDC
Lee, Seong-Doo ; Choi, Soon-Ho ; Kim, Chan-Ki ; Cha, HanJu ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 9, 2015, Pages 1288~1296
DOI : 10.5370/KIEE.2015.64.9.1288
The ac side current of a line commutated converter(LCC) high voltage direct current (HVDC) is characterized by highly non-sinusoidal waveform. If the harmonic current is allowed to flow in the connected ac network, it may cause unacceptable levels of distortion. Therefore, ac side filters are required as part of the total HVDC converter station, in order to reduce the harmonic distortion of the ac side current and voltage to acceptably low levels. The ac filters are also employed to compensate the requested reactive power because LCC HVDC also consume substantial reactive power. Among different types of filters, triple-tuned filters have been widely utilized for HVDC system. This paper presents two design methods of triple-tuned filter; equivalent method and parametric method. Using a parametric method, in particular this paper proposes a design algorithm for a triple tuned filter. Finally, the performance of the design algorithm is evaluated for a 250kV HVDC system in Jeju island. The results cleary demonstrate the effectiveness of proposed design method in harmonics reduction.
Performance Improvement of DC-link Control for a Dynamic Voltage Restorer with Power Feedforward Compensation
Ji, Kyun Seon ; Jou, Sung Tak ; Lee, Kyo-Beum ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 9, 2015, Pages 1297~1305
DOI : 10.5370/KIEE.2015.64.9.1297
This paper proposes a power feedforward technique for the performance improvement of DC-link voltage control in the dynamic voltage restorer (DVR). The DC-link Voltage is able to be unstable for an instant owing to any change in the load and voltage sag. The distortion of the DC-link voltage leads to the negative influence on the performance of DVR. To mitigate the distortion of the DC-link voltage, the power feedforward component is calculated by the load power and the grid voltage, and then it is added to the reference current of the conventional DC-link voltage controller. By including output power feedforward component on the DC-link controller, the DC-link voltage can settle down more quickly than when the conventional DC-link voltage controller applied. The proposed technique was validated through the simulation and experimental results.
Switching Method of 3-phase Interleaved Bidirectional DC-DC Converter to Achieve High Efficiency in Wide Load Range
Jung, Jae-Hun ; Seo, Bo-Gil ; Sun, Daun ; Nho, Eui-Cheol ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 9, 2015, Pages 1306~1314
DOI : 10.5370/KIEE.2015.64.9.1306
This paper deals with a switching method of a three-phase interleaved bidirectional DC-DC converter to obtain high efficiency in wide load range. The proposed soft-switching method provides ZVS and ZCS at turn-on, and ZVS at turn-off of the switch as well as considerably reduced conduction loss in light load. Simulation and experiment are carried out with a bidirectional DC-DC converter having the power rating of 3 [kW], and those results show the validity of the proposed switching method.
Anti-islanding Detection Method for BESS Based on 3 Phase Inverter Using Negative-Sequence Current Injection
Sin, Eun-Suk ; Kim, Hyun-Jun ; Han, Byung-Moon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 9, 2015, Pages 1315~1322
DOI : 10.5370/KIEE.2015.64.9.1315
This paper proposes an active islanding detection method for the BESS (Battery Energy Storage System) with 3-phase inverter which is connected to the AC grid. The proposed method adopts the DDSRF (Decoupled Double Synchronous Reference Frame) PLL (Phase Locked-Loop) so that the independent control of positive-sequence and negative-sequence current is successfully carried out using the detected phase angle information. The islanding state can be detected by sensing the variation of negative-sequence voltage at the PCC (Point of Common Connection) due to the injection of 2-3% negative-sequence current from the BESS. The proposed method provides a secure and rapid detection under the variation of negative-sequence voltage due to the sag and swell. The feasibility of proposed method was verified by computer simulations with PSCAD/EMTDC and experimental analyses with 5kW hardware prototype for the benchmark circuit of islanding detection suggested by IEEE 1547 and UL1741. The proposed method would be applicable for the secure detection of islanding state in the grid-tied Microgrid.
Surface Properties of WO
Transparent Electrode Film with Multilayer Structures
Kang, Dong-Soo ; Lee, Boong-Joo ; Kwon, Hong-Kyu ; Shin, Paik-Kyun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 9, 2015, Pages 1323~1329
DOI : 10.5370/KIEE.2015.64.9.1323
transparent thin films are fabricated by the RF magnetron sputtering. This has a transmittance of front and rear about 90% in the visible light range and surface resistance of 6.41Ω/□. In this paper, we analyzed the surface characteristics caused by the working pressure and O
plasma surface treatment to apply a transparent electrode that was prepared to the laminated structure with other materials. The working pressure was changed in the WO
film to 10mTorr, 7mTorr, and 5mTorr, it showed a lower than roughness of conventional ITO. In addition, by 55.5774 J/m
at 5mTorr, it shows the hydrophobic property with lower process pressure. O
plasma surface treatment was changed at the condisions of the RF power to 150W, 100W, and 50W and the process time to 240s, 180s, 120s, and 60s. The surface roughness are the maximum roughness(Rmax) 6.437nm and the average roughness(Rq) 0.827nm at RF power 150W, and the maximum roughness (Rmax) 6.880nm and the average roughness (Rq) 0.839nm at process time 240sec. It showed a lower value than the surface treatment. also about working pressure and process time is increased, it showed the hydrophobic.
A Study on Acoustic and Vibratory Response of a MEMS Resonant Accelerometer
Lee, Sang Woo ; Lee, Hyung Sub ; Yu, Myeong-Jong ; Kim, Do Hyung ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 9, 2015, Pages 1330~1336
DOI : 10.5370/KIEE.2015.64.9.1330
It is necessary to study on acoustic and vibratory response of a MEMS resonant accelerometer before applying to military applications. In this paper, we analyze why the resonant accelerometer reacts to an acoustic wave and a high frequency vibration. And we describe experimental results on acoustic and vibratory response of the accelerometer. The accelerometer consists of a proof mass and a dual ended tuning fork. It is a differential resonant accelerometer with arranging a pair of accelerometers. The mode shape was analyzed to find out the input mode frequency by using a FEM simulation. Some experiments regarding the acoustic noise was carried out by using a tweeter and a microphone in the anechoic room. Results showed that the accelerometer reacted to the acoustic wave and vibration which had the input mode frequency as we had expected. We showed experimentally not only that the susceptibility of the accelerometer to an acoustic wave was 70 dB but also that the effectiveness of applying an acoustic absorber and a metal case was 20 dB, respectively. Also, we could minimize the vibratory response property of the accelerometer by installing a IMU with a silicone rubber mount pad.
Design of Optimized Pattern Classifier for Discrimination of Precipitation and Non-precipitation Event
Song, Chan-Seok ; Kim, Hyun-Ki ; Oh, Sung-Kwun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 9, 2015, Pages 1337~1346
DOI : 10.5370/KIEE.2015.64.9.1337
In this paper, pattern classifier is designed to classify precipitation and non-precipitation events from weather radar data. The proposed classifier is based on Fuzzy Neural Network(FNN) and consists of three FNNs which operate in parallel. In the proposed network, the connection weights of the consequent part of fuzzy rules are expressed as two polynomial types such as constant or linear polynomial function, and their coefficients are learned by using Least Square Estimation(LSE). In addition, parametric as well as structural factors of the proposed classifier are optimized through Differential Evolution(DE) algorithm. After event classification between precipitation and non-precipitation echo, non-precipitation event is to get rid of all echo, while precipitation event including non-precipitation echo is to get rid of non-precipitation echo by classifier that is also based on Fuzzy Neural Network. Weather radar data obtained from meteorological office is to analysis and discuss performance of the proposed event and echo patter classifier, result of echo pattern classifier compare to QC(Quality Control) data obtained from meteorological office.
Design of Robust Face Recognition System to Pose Variations Based on Pose Estimation : The Comparative Study on the Recognition Performance Using PCA and RBFNNs
Ko, Jun-Hyun ; Kim, Jin-Yul ; Oh, Sung-Kwun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 9, 2015, Pages 1347~1355
DOI : 10.5370/KIEE.2015.64.9.1347
In this study, we compare the recognition performance using PCA and RBFNNs for introducing robust face recognition system to pose variations based on pose estimation. proposed face recognition system uses Honda/UCSD database for comparing recognition performance. Honda/UCSD database consists of 20 people, with 5 poses per person for a total of 500 face images. Extracted image consists of 5 poses using Multiple-Space PCA and each pose is performed by using (2D)
PCA for performing pose classification. Linear polynomial function is used as connection weight of RBFNNs Pattern Classifier and parameter coefficient is set by using Particle Swarm Optimization for model optimization. Proposed (2D)
PCA-based face pose classification performs recognition performance with PCA, (2D)
PCA and RBFNNs.
Frequency Analysis of Adaptive Behavior of NEAT based Control for Snake Modular Robot
Lee, Jaemin ; Seo, Kisung ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 9, 2015, Pages 1356~1362
DOI : 10.5370/KIEE.2015.64.9.1356
Modular snake-like robots are robust for failure and have flexible locomotions for obstacle environment than of walking robot. This requires an adaptation capability which is obtained from a learning approach, but has not been analysed as well. In order to investigate the property of adaptation of locomotion for different terrains, NEAT controllers are trained for a flat terrain and tested for obstacle terrains. The input and output characteristics of the adaptation for the neural network controller are analyzed for different terrains in frequency domain.
Discriminative Feature Vector Selection for Emotion Classification Based on Speech
Choi, Ha-Na ; Byun, Sung-Woo ; Lee, Seok-Pil ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 9, 2015, Pages 1363~1368
DOI : 10.5370/KIEE.2015.64.9.1363
Recently, computer form were smaller than before because of computing technique's development and many wearable device are formed. So, computer's cognition of human emotion has importantly considered, thus researches on analyzing the state of emotion are increasing. Human voice includes many information of human emotion. This paper proposes a discriminative feature vector selection for emotion classification based on speech. For this, we extract some feature vectors like Pitch, MFCC, LPC, LPCC from voice signals are divided into four emotion parts on happy, normal, sad, angry and compare a separability of the extracted feature vectors using Bhattacharyya distance. So more effective feature vectors are recommended for emotion classification.
Hybrid Super Resolution Based on Curve Subdivision Interpolation and Neighbor Embedding
Oh, Euiyeol ; Lee, Yonggun ; Lee, Jieun ; Choe, Yoonsik ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 9, 2015, Pages 1369~1373
DOI : 10.5370/KIEE.2015.64.9.1369
Curve subdivision interpolation reconstructs edge well with low complexity, however it lacks of ability to recover texture components, instead. While, neighbor embedding is superior in texture reconstruction. Therefore, in this paper, a novel Super Resolution technique which combines curve subdivision interpolation and neighbor embedding is proposed. First, edge region and non-edge regions are classified. Then, for edge region, the curve subdivision algorithm is used to make two polynomials derived from discrete pixels and adaptive weights are adapted for gradients of 4 different sides to make smooth edge. For non edge region, neighbor-embedding method is used to conserve texture property in original image. Consequently results show that the proposed technique conserves sharp edges and details in texture better, simultaneously.
Using the TDR in Dielectric for Partial Discharge Signals Detection Method
Choi, Mun-Gyu ; Cha, Hanju ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 9, 2015, Pages 1374~1379
DOI : 10.5370/KIEE.2015.64.9.1374
Time Domain Reflectometry(TDR) using microwave bands, including broadband spectrum that occurs at the range of rates that start between partial discharge position it easier to make the techniques that could be measured. Partial discharge in the Gas Insulated Switchgear(GIS), the dielectric constant in the band more than GHz different the insulating material if you want to organize, and the insulating material regardless of how partial discharge position in the SF6 gas Partial Discharge by applying the heritability estimated its position, but the position error occurred about 23 percent of the existing way, correct in not suitable location tracking the outbreak PD. This technique the rate of other dielectric that make up the power apparatus heterology is measured at the function to slow the progression of the electromagnetic waves apart by calculating the partial discharge as the location, A simple way to track. Dielectric using other methods proposed new structure can calculate the speed of heritability PD is occurring can measure.
A Study on a Current Controller using TMS320F240 Microprocessor
Bae, Jong-Il ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 9, 2015, Pages 1380~1384
DOI : 10.5370/KIEE.2015.64.9.1380
The DC motor has the strong characteristics in the speed response, the system parameter variations and the external influence and is used as the speed controller with its good starting torque in the distributing industry. However development of the Microprocessor which is for high speed switching program can make better control system. This paper introduce to design of the high-effective DC motor controller that is using Software Bang-Bang Program of Fuzzy algorithm and to verify a PI controller and a Fuzzy controller.
Analysis of Multiple Factor of the Eddy Current Brake for Railway Application
Lee, Chang-Mu ; Park, Hyun-Jun ; Cho, Sooyoung ; Lee, Ju ; Lee, Hyung-Woo ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 9, 2015, Pages 1385~1390
DOI : 10.5370/KIEE.2015.64.9.1385
This paper is analysis of multiple factor that should be considered in the design of an eddy current brake used as auxiliary brake system. The eddy current brake is a brake that generates a braking torque in a rotational direction opposite to the direction of the rotor by using a time-varying magnetic flux. The eddy current brake has the advantage of being able to take high current densities because this is used for a short period of time. Also, the eddy current brake is influenced by multiple factor such as number of slots, teeth width, coating thickness, air-gap length and so on. Therefore the eddy current brake was designed for use in railway application in consideration of the operation region and critical parameters.
Performance Analysis for Regenerative Energy Storage System in Kyoung-bu High Speed Railway
Jang, Min-Ju ; Jeon, Yong-Joo ; Lho, Young Hwan ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 9, 2015, Pages 1391~1397
DOI : 10.5370/KIEE.2015.64.9.1391
Recently, various researches are conducted in the application of regenerative energy produced during the operation of an electric locomotive. Regenerative energy is produced by a generator in the brake procedure. The generator is operated by kinetic energy of an electric railroad using an electric motor. The process of producing regenerative energy varies with the current type of a railroad and its running condition. The quality of electric power can be improved and electric energy can be utilized effectively, especially in the use of an energy storage system (ESS). Thus, it is necessary to apply ESS into AC section and high speed railway. This study analyses the composition of the regenerative ESS equipment installed in Yong-Jeong sectioning post, operational principle, charge and discharge algorithm and energy efficiency. The analysis shows that CO2 emissions can be reduced about 0.5 ton per a day. In addition, ESS helps saving the energy and the compensation of the voltage drop caused by the operation of high speed train when it is installed at the end of the feeder section. The number of high speed train will be increased continuously related to the electrification rate. Therefore, applying the ESS to high speed railway is expected to solve the instability of the feeder voltage and the equipment capacity problem caused by the high speed trains.
Optimization of LTE-R Network using 2.6GHz Test Frequency in Daebul Test Line
KWAK, Woo-Hyun ; KIM, Yong-Kyu ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 9, 2015, Pages 1398~1405
DOI : 10.5370/KIEE.2015.64.9.1398
Domestic railway communication in Korea has been introduced for mutual communications among control center, operation staffs, and maintenance staffs. It has been mainly used as railway disaster and safety functions from VHF and UHF from 1980’s and TRS-Astro and TRS-Tetra from the 2000’s. Recently for urban railways communications, 18GHz and 2.4GHz ranges have been utilized for image transmissions and control command communications, respectively. This paper analyzes technical development of LTE-R, LTE communication for Railways, that has been designed as a single integrated railway wireless network in order to merge the current various communication systems. In this paper, we present the details of the examination of the LTE-R test-bed using 2.6GHz test frequency in Daebul test line through CW test and optimization test.
Implementation of Multi-functional Type Condition Monitoring System for Railway Catenary Systems
Park, Young ; Lee, Kiwon ; Park, Shin Young ; Park, June Young ; Choi, Won Seok ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 9, 2015, Pages 1406~1410
DOI : 10.5370/KIEE.2015.64.9.1406
The railway catenary systems consist of a complex structure, electrical and mechanical conditions are exposed to dangerous environment due to current collection between pantograph and catenary systems. These two types of conditions for the catenary systems are critically assessed for management and are becoming increasingly more dependent on reliable inspection system. In this paper, a new measurement system which enables inspection of catenary faults was studied and implemented. The system uses wavelength band of ultraviolet (UV) and IR (Infrared) to measure the insulation of corona and temperature of catenary wire. In order to determine the sensitivity of implemented system, the performance test such as distance detection range of UV camera and temperature resolution of IR camera were conducted, respectively. The field test of development system was also conducted in metro and high-speed line using mobile type UV and IR multi-composited measurement systems.