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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 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
Control of Islanded Microgrid Using Fuzzy Logic
Lee, Heung-Seok ; Park, June Ho ; Koo, Bon-Gil ; Kim, Jong-Yul ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 6, 2014, Pages 727~737
DOI : 10.5370/KIEE.2014.63.6.727
This paper presents the design of Fuzzy PI controller that is used at BESS(Battery Energy Storage System) charging and discharging process for islanded operation in microgrid. Most of the PI controllers have fixed PI gains, but real-time updated gains are applied to PI controller using Fuzzy logic in this paper. The performances of suggested Fuzzy PI controller are simulated by PSCAD/EMTDC. As a result, output characteristics of ESS applied real-time updated gains to PI controller are faster than those of using fixed gains.
Effect of Harmonics and High-Frequency on OLEV System in Distribution Power System
Choi, Seong-Ho ; Huh, Jae-Sun ; Han, Woon-Ki ; Kim, Jae-Chul ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 6, 2014, Pages 738~745
DOI : 10.5370/KIEE.2014.63.6.738
Recently, various measures have been discussed for overcoming depletion of fossil fuels and environmental pollution. One of the measures is electric vehicles. But electric vehicles has some limitations from high cost of battery and low efficiency, so operation distance of electric cars is limited. Also there are difficulties that charging lines should be connected by an electric car whenever it charges. Thus, many studies have been conducted to overcome the limitation using conventional batteries of electric vehicles. As a result, the OLEV(On-Line Electric Vehicle) was developed. But the OLEV system is some limitations. The OLEV system causes power quality problems when it charges. Power quality problem cannot be ignored because OLEV systems are closely connected by distribution grids. In this paper, the OLEV system is designed by using PSCAD/EMTDC, and the power quality is measured and evaluated. Power quality is divided by two cases; harmonics and high-frequency. Harmonics were evaluated according to IEEE Std. 519-1992. But the evaluation of High-frequency could not take it because there was no standard. For this reason, the data measured by OLEV system was compared with the EN50065 regulation.
Method to Determine Areas of Vulnerability for Calculating Sag Cumulative Table and Sag Density Table
Park, Chang-Hyun ; Lee, Hansang ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 6, 2014, Pages 746~751
DOI : 10.5370/KIEE.2014.63.6.746
This paper presents a method to calculate a sag cumulative table and density table based on the area of vulnerability to voltage sags. The expected sag performance at sensitive load points can be easily assessed through the calculation of the sag cumulative table and density table. However, the calculation of the tables regarding large power systems is very difficult task. Therefore, an efficient method for calculating the tables is needed. In this paper, the improved method to determine the areas of vulnerability is addressed and the method to calculate the tables based on the area of vulnerability is also described. The proposed scheme can be efficiently used to assess the voltage sag performance at sensitive load points in large power systems.
Transmission Network Expansion Planning Using Risk Level Improvement Index
Kim, Sung-Yul ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 6, 2014, Pages 752~757
DOI : 10.5370/KIEE.2014.63.6.752
This paper attempts to evaluate the impact of power plant penetration on constraints of a transmission network and proposes a methodology based on risk level, which can evaluate the condition of the network and facilities intuitionally. Furthermore, based on this methodology, RLII(Risk Level Improvement Index) is proposed in order to establish comprehensive TNEP(Transmission Network Expansion Planning) from a viewpoint of ISO(Independent System Operator). In order to verify the proposed methods in this paper, real power systems in Incheon and Shiheung areas, south Korea are applied to the case study.
Linearity Optimization of DC CT and a Study on the Application of HVDC System
Choi, Yong-Kil ; Lee, Eun-Jae ; Choi, Ho-Seok ; Lee, Wook-Hwa ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 6, 2014, Pages 758~763
DOI : 10.5370/KIEE.2014.63.6.758
These days, the advantages of DC power system are consistently stand out in korea that was a small power loss and high stability. Needs of DC power transmission technology is focused In the midst of a smart grid and environment friendly generation technology boom that is needed for next generation technology. Researches and businesses for HVDC(High Voltage Direct Current) system has been began. But, Needs of HVDC equipment and system commissioning technology are not on the rise until now. In particular, South Korea`s HVDC technology is after the foot runner of advanced country and company. In addition, There is no experience for equipment verification and commissioning technology. And Experts of HVDC are rare. Who has been fully understood hardware and system as a whole, and identified all the equipment`s characteristic. Recently, Academia and industry are recognized a needs of HVDC technology. But it does not received a recognition of technical value. In this paper, introduce issues when we apply the IEEE`s verification method for HVDC system, especially DC current measurement system, DC CT(Direct Current Transformer), among the HVDC equipments. And Proposes remedial methods on the issue in order to recognize the necessity that was HVDC equipments`s verification and commissioning technology research should be focused on.
A Study on SVL Transient Characteristics by Switching Overvoltage at Single Point Bonding Section in Underground Transmission Cables
Jung, Chae-Kyun ; Kang, Ji-Won ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 6, 2014, Pages 764~769
DOI : 10.5370/KIEE.2014.63.6.764
This paper describes sheath voltage limiter(SVL) transient characteristics by switching overvoltage considering single point bonding in underground transmission cables. The crossbonding system is generally used for grounding methods of underground transmission system. However, the single point bonding system is used in selective area which is difficult to consist of crossbonding major section. The sheath voltage limiters are connected between joints in the single point bonding. Specially, the high overvoltage might be generated in that section as well as the aging of sheath voltage limiter might be progressed by various electrical stress including lightning overvoltage, switching overvoltage and power frequency overvoltage. Therefore, in this paper, the switching overvoltage characteristics in underground cables are firstly analysed using EMTP simulation. Then, the switching overvoltage of sheath voltage limiter is also studied in single point bonding. Finally, the reduction method of sheath voltage limiter switching overvoltage is proposed by various simulation studies including circuit breaker operating order.
An Analysis of FCCL Shielding Effect for EMF Attenuation to On-Line Electric Vehicle
Shim, Hyung-Wook ; Kim, Jong-Woo ; Cho, Dong-Ho ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 6, 2014, Pages 770~775
DOI : 10.5370/KIEE.2014.63.6.770
According to ICNIRP guidelines for limiting exposure to time-varying electric, magnetic and electromagnetic fields up to 300GHz, magnetic flux density which range from 3Hz to 150kHz are regulated to lower than
. In order to comply with its standard, OLEV(On-Line Electric Vehicle) have been designed considering EMF(Electro-Magnetic Field) reduction. However, if a current flowing in power line would be bigger for increasing power transfer efficiency, the established shield system no longer acts their role properly. In this paper, therefore, FCCL(Flexible Copper Clad Laminate) is applied to power line and pick-up devices to solve the problems. Though, the FCCL is normally utilized to insulator on circuit board, because of its high heat resistance characteristic, flexibility and thin properties, it makes effectiveness in the shielding device as well. 4 types of FCCL shielding structure are introduced to power line and pick-up devices. From the results, the FCCL which are placed in proposed positions shows maximum EMF reduction compared to the established shielding structure. Henceforth, if OLEV is applied FCCL shielding structure in practice, it will not only be more safe but also step forward to commercialization near future.
Efficiency Analysis of Magnetic Resonance Wireless Power Transmission using Superconductor Coil According to the Changing Position of Transmission and Receiving Coils
Kang, Min-Sang ; Choi, Hyo-Sang ; Jeong, In-Sung ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 6, 2014, Pages 776~779
DOI : 10.5370/KIEE.2014.63.6.776
In this paper, we analyzed the efficiency of magnetic resonance wireless power transmission (WPT) using superconductor coil according to the changing position of transmission and receiving coils. We implemented a WPT system using a magnetic resonance at a frequency of 63.1 kHz. Transmission and receiving coils using superconductor coil were wound on a spiral manner of diameter 100mm. For comparison, transmission and receiving coils using normal conductor coil were designed under the same condition. At a distance of 50mm, we measured efficiency when transmission-receiving coils were matched 25%, 50%, 75% and 100%. When a superconductor coil was applied to the transmission and receiving units, efficiency of WPT was very high. In addition, in the case of the superconducting transmission-receiving coils, when coils matched 100% the efficiency was 30% and matched 25% the efficiency was 8%.
Estimation of Insulation Diagnosis and Dielectric Strength in 6.6 kV Motor Stator Windings
Kim, Hee-Dong ; Kong, Tae-Sik ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 6, 2014, Pages 780~785
DOI : 10.5370/KIEE.2014.63.6.780
To assess the deterioration condition of stator insulation, diagnostic and AC dielectric strength tests were performed on five high voltage (HV) motors (2,000 HP, 6.6 kV) for boiler feed-water pump (BFP). Two HV motors for BFP were installed per unit. Following the long term rewinding program, the diagnostic test was performed on five 6.6 kV motors during the planning maintenance period. After completing diagnostic test, AC dielectric strength test was done on the stator windings of HV motors. The AC dielectric strength test was conducted at 15 kV for one minute. Dielectric strength test and diagnostics test results confirmed that the stator insulation was judged to be in serviceable condition in the five 6.6 kV motors.
Model Following Control of Linear Time-Invariant System with Uncertain Time Delay
Kim, Hye-Kyung ; Kim, Young Chol ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 6, 2014, Pages 786~796
DOI : 10.5370/KIEE.2014.63.6.786
This paper presents a new approach to design a robust tracking controller for linear time-invariant systems with uncertain time-delay. By introducing the model following control (MFC) structure which consists of two loops in nature, we show that the controller is capable of having a predictive control action and effectively tracking the reference output with a desired transient response as well. Three design techniques to achieve good tracking performance are suggested. It is also analytically shown that the tracking performance of the proposed scheme is more robust than that of typical single-loop feedback structure. An illustrative example is given to compare the tracking performances of the proposed methods with a single loop method.
Design of RBFNNs Pattern Classifier Realized with the Aid of PSO and Multiple Point Signature for 3D Face Recognition
Oh, Sung-Kwun ; Oh, Seung-Hun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 6, 2014, Pages 797~803
DOI : 10.5370/KIEE.2014.63.6.797
In this paper, 3D face recognition system is designed by using polynomial based on RBFNNs. In case of 2D face recognition, the recognition performance reduced by the external environmental factors such as illumination and facial pose. In order to compensate for these shortcomings of 2D face recognition, 3D face recognition. In the preprocessing part, according to the change of each position angle the obtained 3D face image shapes are changed into front image shapes through pose compensation. the depth data of face image shape by using Multiple Point Signature is extracted. Overall face depth information is obtained by using two or more reference points. The direct use of the extracted data an high-dimensional data leads to the deterioration of learning speed as well as recognition performance. We exploit principle component analysis(PCA) algorithm to conduct the dimension reduction of high-dimensional data. Parameter optimization is carried out with the aid of PSO for effective training and recognition. The proposed pattern classifier is experimented with and evaluated by using dataset obtained in IC & CI Lab.
Analysis on Scream and Ambient Noise for Security System with Audio Capability
Park, Ju-Hyun ; Seo, Ji-Hun ; Lee, Seok-Pil ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 6, 2014, Pages 804~809
DOI : 10.5370/KIEE.2014.63.6.804
Recently, the prevention of crime using CCTV draws special in accordance with the higher crime incidence rate. Therefore security systems like a CCTV with audio capability are developing for giving an instant alarm. This paper proposes an analysis on screams and ambient noises for security systems with audio capability. This analysis result will be helpful for security systems to detect screams well with various ambient noises in real environment.
Motion Object Detection Based Hagwon-Bus Boarding Danger Warning System
Song, Young-Chul ; Park, Sung-Ryung ; Yang, Seung-Han ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 6, 2014, Pages 810~812
DOI : 10.5370/KIEE.2014.63.6.810
In this paper, a hagwon-bus boarding danger warning system based on computer vision is proposed to protect children from an accident causing injuries or death. Three zones are defined and different algorithms are applied to detect moving objects. In zone 1, a block-based entropy value is calculated using the absolute difference image generated by the absolute differential estimation between background image and incoming video frame. In zone 2, an effective and robust motion object tracking algorithm is performed based on the particle filter. Experimental results demonstrate the efficient and effectively of the algorithm for moving object inspection in each zone.
Monosyllable Speech Recognition through Facial Movement Analysis
Kang, Dong-Won ; Seo, Jeong-Woo ; Choi, Jin-Seung ; Choi, Jae-Bong ; Tack, Gye-Rae ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 6, 2014, Pages 813~819
DOI : 10.5370/KIEE.2014.63.6.813
The purpose of this study was to extract accurate parameters of facial movement features using 3-D motion capture system in speech recognition technology through lip-reading. Instead of using the features obtained through traditional camera image, the 3-D motion system was used to obtain quantitative data for actual facial movements, and to analyze 11 variables that exhibit particular patterns such as nose, lip, jaw and cheek movements in monosyllable vocalizations. Fourteen subjects, all in 20s of age, were asked to vocalize 11 types of Korean vowel monosyllables for three times with 36 reflective markers on their faces. The obtained facial movement data were then calculated into 11 parameters and presented as patterns for each monosyllable vocalization. The parameter patterns were performed through learning and recognizing process for each monosyllable with speech recognition algorithms with Hidden Markov Model (HMM) and Viterbi algorithm. The accuracy rate of 11 monosyllables recognition was 97.2%, which suggests the possibility of voice recognition of Korean language through quantitative facial movement analysis.
Design of Coordinated Frequency Control Strategy applied to EDLC and BESSs for Microgrid in the Islanded Mode
Yoo, Hyeong-Jun ; Kim, Hak-Man ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 6, 2014, Pages 820~827
DOI : 10.5370/KIEE.2014.63.6.820
Since a microgrid has renewable energy sources, imbalance between power supply and power demand occurs in the islanded mode. In order to solve the imbalance, several energy storage systems (ESSs) such as bettary energy storage system (BESS), EDLC (electric double layer capacitor), flywheel, and SMES (superconducting magnetic energy storage) are generally used. Especially, their electrical characteristics are different. For efficient use of them, a coordinated control scheme is required. In this paper, a coordinated control scheme for using a Lead-acid BESS, a Lithium BESS, and a EDLC is designed to efficient frequency control for a microgrid in the islanded mode. The coordinated frequency control strategy is designed based on their electrical characteristics. The feasibility of the proposed coordinated frequency control strategy is verified through the simulation.
Development of DC Leakage Current Sensor for Solar Power Generation System
Kim, Hee-Sun ; Hahn, Song-Yop ; Han, Hoo-Sek ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 6, 2014, Pages 828~833
DOI : 10.5370/KIEE.2014.63.6.828
Grid connected transformerless solar power generation system is frequently used with the benefits of cost and efficiency. However, significant DC leakage current can flow from the DC line into the ground with dielectric breakdown in the transformerless solar power generation system. The leakage current occurred in the DC line causes accidents such as fire and electric shock on human. To resolve this problem, high sensitivity DC leakage current sensor is needed. But recently the studies on safety of DC line are not performed. In this paper, a high sensitivity DC leakage current sensor that can detect DC leakage current in solar power generation system, is proposed. Based on the studies, DC leakage current sensor is fabricated and characteristic tests are carried out. Finally, the accuracy of sensor performance is verified by leakage current experiments in solar power generation system.
The Analysis of Influence on High-speed Train(KTX) ATC Signals according Sand Materials
Yun, Cha-Jung ; Noh, Myoung-Gyu ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 6, 2014, Pages 834~840
DOI : 10.5370/KIEE.2014.63.6.834
When the high speed train (KTX) departs from station in the high-speed line, intermittent on-board signal disappearance causes a hindrance of the operation punctuality. Therefore, we have a research objective to verify the causes of hindrance and to find an improvement plan. process of research, when train leaves the station, we applied sand on the rail to improve adhesive power, that sand has an effect on the ATC(Automatic Train Control) signal wave. We detected & analyzed signal waves which is came from detecting device by changing operation condition in accordance with sand material overage detection to be achieved.
Peak Power Optimization for Metro Railway using by Source Impedance Control
Kim, Han-Su ; Kwon, Oh-Kyu ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 6, 2014, Pages 841~849
DOI : 10.5370/KIEE.2014.63.6.841
Urban railway with rectifiers is connected by parallel circuits because substations are joined by the power rail. Thus, if an input voltage of a substation is increased, then the voltage of rectifiers is also increased, and which leads to an increase in the peak power of the substation. To solve this problem, this paper proposes a new method reducing the peak power of substations by adjusting the operation number of rectifiers. Its feasibility is exemplified by some simulations performed for Incheon subway Line 1 and GA(Genetic Algorithm) method has been applied to obtain the optimal input. Simulation results show that peak power can significantly be reduced using the method proposed in this paper.
On the Implementation of an Advanced Judgement Algorithm for Contact Loss of Catenary System
Park, Young ; Jung, Ho-Sung ; Yun, Il-Kwon ; Kim, Wonha ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 6, 2014, Pages 850~854
DOI : 10.5370/KIEE.2014.63.6.850
Analyzing dynamic performance between pantograph and contact wire depends on mechanical and electrical conditions such as contact force, currents, aerodynamics of pantograph and tension of overhead contact wire. For the characteristic of dynamic performance between pantograph and overhead contact wire, various evaluation systems are used to measuring of the interaction of the contact line and the pantograph. Among the various methods, the contact force and percentage of arcing are intended to prove the safety and the quality of the current collection system on the train. However, these methods are only capable of measuring on the train which are installed measurement systems. Therefore in this paper, a track-side monitoring system was implemented to measure electrical characteristics from active overhead contact wire systems in order to constantly estimate current collection performance of railway operation. In addition, a method to analyze loss of contact phenomena was proposed. According to simulation results, the proposed system was capable of measuring abnormal electrical behavior of pantograph and contact wires on the track-side. The advantage of the proposed system is possible to detect loss of contact or any other electrical abnormalities of all types of trains within sections from sub to sub without the need to install any on-board equipment on trains.
Analysis of Percentage of Arcing between Pantograph and Overhead Contact Line as a Function of Duration of Arc
Park, Young ; Lee, Kiwon ; Kwon, Sam-Young ; Park, Chulmin ; Kim, Jae-Kwang ; Choi, Won Seok ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 6, 2014, Pages 855~859
DOI : 10.5370/KIEE.2014.63.6.855
Quality criteria for interaction between a pantograph and overhead contact wire is a most important requirement to assess of the performance for the current collection system. Interaction performance between pantograph and catenary system is subject to approval by the infrastructure manager when a new design and contraction of overhead contact line and pantograph are installed. Among the various performance, percentage of arcing at maximum line speed is a simple test method compared with contact force of pantograph due to direct sensing of pantagraph, calibrations, installations of train, and etc. On the other hand, percentage of arcing is need to reliable arcing detector and general requirements with accordance with EN 50317. In this paper, percentage of arcing are investigated on the function of duration of arc and proposed which is satiable of percentage of arcing. As a results, we proposed which duration of arcs are unsuitable from infrastructures point of view as performance testing for quality of current collection.
Capacity Determination of ESS for Peak Load Shaving Based on the Actual Measurement of Loads in the Substation of Urban Railway
Park, Jong-Young ; Jung, Hosung ; Kim, Hyungchul ; Shin, Seungkwon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 6, 2014, Pages 860~865
DOI : 10.5370/KIEE.2014.63.6.860
This paper proposes the method for determination of the capacities of ESS (Energy Storage System) and PCS (Power Conditioning System) for the peak load shaving based on the load data in the substation of urban railway. In addition, this paper analyze the actual measurement of loads in the substation of urban railway. The load of a weekday in the substation of urban railway is high around rush hours in the morning and evening, which is different from that of a normal substation. The required capacities of ESS and PCS become larger as the amount of peak load shaving is higher, and are affected from the patterns of daily load in the substation.