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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
A Study on Frequency Control and Active Power Control of Wind Turbine Generation System for PMSG
Lee, Kwang-Soo ; Kim, Mun-Kyeom ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 5, 2014, Pages 597~607
DOI : 10.5370/KIEE.2014.63.5.597
This paper proposes active power control and frequency support control schemes of wind turbine generation system by using modified Maximum Power Point Tracking(MPPT) of Permanent Magnet Synchronous Generator(PMSG). Most wind turbine generation system is completely decoupled from the power system and power output control with pitch control. According to the frequency deviation, however, MPPT control can not contribute to the frequency change of the power system due to its active power output control. For solving this, the de-loaded(DL) control scheme is constructed for the frequency support control, which is based on applying the active power output control in the rotor speed control of PMSG. The rotor speed by used in the proposed DL control scheme is increased more than the optimal rotor speed of MPPT, and then this speed improvement increases the saved kinetic energy(KE). In order to show the effectiveness of the proposed control scheme, the case studies have been performed using the PSCAD/EMTDC. The results show that the proposed active power output control scheme(DL control and KE discharge control) works properly and the frequency response ability of the power system can be also improved with the frequency support of wind farm.
Analysis of Human Safety and System Effect according to Grounding Scheme in LVDC Distribution System
Oh, Yun-Sik ; Han, Joon ; Gwon, Gi-Hyeon ; Kim, Doo-Ung ; Noh, Chul-Ho ; Jung, Tack-Hyun ; Kim, Chul-Hwan ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 5, 2014, Pages 608~614
DOI : 10.5370/KIEE.2014.63.5.608
Recent developments and trends in the electric power consumption clearly indicate an increasing use of DC in end-user equipment. According to the trends, new DC power distribution systems have been researched and developed although we presently enjoy a predominantly AC power distribution system. We can use various grounding schemes in DC distribution system as well as in AC distribution system to protect human body and equipments. However, we need to evaluate carefully which grounding scheme is appropriate for a specific system before applying those schemes. In this paper, we analyze the human safety and system effect according to various grounding schemes in Low Voltage DC (LVDC) distribution system. Some components in LVDC distribution system are modeled and computer simulations are conducted by using ElectroMagnetic Transient Program (EMTP).
Modeling of Bi-directional DC/DC Converter for Connecting DC Distribution System using EMTP
Han, Joon ; Kim, Doo-Ung ; Oh, Yun-Sik ; Gwon, Gi-Hyeon ; Noh, Chul-Ho ; Jung, Tack-Hyun ; Kim, Chul-Hwan ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 5, 2014, Pages 615~621
DOI : 10.5370/KIEE.2014.63.5.615
With development of electrical power system, the DC distribution system has been considered as a promising technology to be used in the future smart distribution system. Among the various components comprising the DC distribution system, the bi-directional DC/DC converter is one of the most important equipment to interconnect between main power system and various renewable resources such as photovoltaic power generation, wind power generation, and electrical vehicles. In this paper, a bi-directional DC/DC converter based on three-phases interleaved method which is effective to reduce ripple of input current and output voltage is modeled using ElectroMagnetic Transient Program(EMTP), and the verification of modeled bi-directional DC/DC converter is conducted.
SOC-based Control Strategy of Battery Energy Storage System for Power System Frequency Regulation
Yun, Jun Yeong ; Yu, Garam ; Kook, Kyung Soo ; Rho, Do Hwan ; Chang, Byung Hoon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 5, 2014, Pages 622~628
DOI : 10.5370/KIEE.2014.63.5.622
This paper presents the SOC-based control strategy of BESS(Battery Energy Storage System) for providing power system frequency regulation in the bulk power systems. As the life cycle of BESS would be shortened by frequent changes of charge and discharge required for frequency regulation in a steady state, the proposed algorithm operates BESS within a range of SOC where its life cycle can be maximized. However, during a transient period of which occurrence frequency is low, BESS would be controlled to use its full capacity in a wider range of SOC. In addition, each output of multiple BESS is proportionally determined by its SOC so that the balance in SOC of multiple BESS can be managed. The effectiveness of the proposed control strategy is verified through various case studies employing a test system. Moreover, the control result of BESS with the measured frequency from a real system shows SOC of BESS can be maintained within a specific range although the frequency deviation is biased.
Effects Analysis of Partial Discharge Signal Propagation Characteristics in Underground Transmission Cables Using EMTP
Jung, Chae-Kyun ; Jang, Tai-In ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 5, 2014, Pages 629~635
DOI : 10.5370/KIEE.2014.63.5.629
This paper describes propagation characteristics obtained by considering semiconducting screen and cross-bonding in underground transmission cables. The semiconducting screen of power cable has effect on propagation characteristics including attenuation, velocity and surge impedance. However, it is very difficult to apply the semiconduction screen for EMTP model because of the number of conductors limitation. Therefore, CIGRE WG 21-05 proposed advanced insulation structure and analysis technique of simplified approach including inner and outer semiconducting screen. In this paper, the various propagation characteristics analyse using this structure and technique for 154kV XLPE
cable. The frequency independent model of EMTP CABLE PARAMETER is used for just pattern analysis of propagation characteristics. For exact data analysis, the frequency dependent model of J-marti is used for EMTP modeling. From these result, various propagation characteristics of 154kV XLPE
cable according to semi conducting screen consideration, frequency range, cable length and pulse width are analysed. In addition, in this paper, the effects of cross-bonding are also variously discussed according to cross-bonding methods, direct connection and impedance of lead cable.
Operation Effectiveness Evaluation According to Conductor Transposition Adoption in Underground Power Cable Systems
Kim, June ; Lee, Jong-Beom ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 5, 2014, Pages 636~643
DOI : 10.5370/KIEE.2014.63.5.636
Length of most underground power cable in nation is not so long. Therefore it is operated without conductor transposition due to low unbalanced ratio. However, if cable length is long, line constant of each cable will be different. Different line constant can induce unbalanced voltage and current of sheath. Also it can induce several induced interference. This paper describes the operation effectiveness through steady and transient analysis on transposition and untransposition of cable conductor. Especially sheath current and induced voltage are analyzed and compared in case of transposition and untransposition. EMTP is used for modeling and analysis.
Optimal Load Control Method for Solar-Powered House with Energy Storage System
Jeon, Jeong-Pyo ; Kim, Kwang-Ho ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 5, 2014, Pages 644~651
DOI : 10.5370/KIEE.2014.63.5.644
The renewable energy system and the real-time pricing can provide the significant economic advantage for end-user of residential house. However, according to recent studies, high initial cost of renewable energy system such as photovoltaic (PV) system and lack of suitable load control methods adjusting electric power consumption in response to time-varying price are regarded as the major obstruction for introduction of renewable energy system and real-time pricing in residental household. In this paper, we propose automated optimal load control strategy which aim to achieve not only minimizing the electricity cost but also the increase in the utilization rates of PV generation power of residential PV house in real-time pricing environment. Simulation results show that our proposed optimal load control strategy leads to significant reduction in the electricity costs and increase in the utilization rates of power generated by PV system in comparison with the conventional PV house. Therefore, the proposed optimal load control strategy can provide more economic benefit to end-user.
Characteristic Analysis of Double sided Permanent Magnet Linear Generator by using Analytical Method
Kang, Han-Bit ; Choi, Jang-Young ; Kim, Kyong-Hwan ; Hong, Keyyong ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 5, 2014, Pages 652~659
DOI : 10.5370/KIEE.2014.63.5.652
This paper deals with characteristic analysis of double sided permanent magnet linear generator using analytical method. We derived magnetic field solutions produced by permanent magnet and armature reaction based on the 2D polar coordinate and magnetic vector potential. based on the derived magnetic field solutions, Induced voltage is obtained when arbitrary sinusoidal input condition. In addition, electrical parameters such as back-EMF constant, resistance, and inductance are obtained. Finally, generating performance characteristic at the rated load and various load is examined by using equivalent circuit.
Improved back-EMF of 30kW Interior Permanent Magnet Synchronous Generator for Small Hydropower Generation
Kim, Daekyong ; Jeong, Hak-Gyun ; Park, Han-Seok ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 5, 2014, Pages 660~665
DOI : 10.5370/KIEE.2014.63.5.660
This paper presents the improved back-EMF of Interior Permanent Magnet Synchronous Generator(IPMSM) for small hydropower generator. To improve back-EMF characteristics, the size and position of notch are applied to the rotor. In addition, parametric analysis of the notch size and position was performed. Finally, the back-EMF characteristic analysis are confirmed by the experimental results.
The Antenna Radiating Pattern and Gain`s changes according to Insulating Material
Lee, Ye-Na ; Choi, Sun-Ho ; Huh, Chang-Su ; Choi, Jin-Su ; Park, Woo-Chul ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 5, 2014, Pages 666~670
DOI : 10.5370/KIEE.2014.63.5.666
TEM Horn antenna is typically used in HPEM area. It is necessary to apply a high voltage of the antenna for radiating HPEM. Then, it is necessary to insulate essentially of applying a high voltage to the antenna. At this time, radiation pattern and gain of the TEM Antenna is changed. For this reason, it is necessary to analyze changing characteristics by using simulation. In this paper, I analyzed the radiation pattern of the antenna in accordance with the lens and insulating material. As a result, it was observed that the value of the gain is changed in accordance with the frequency. The lens is used for the antenna, the gain characteristic is improved.
Fabrication of Hydrophilic Poly(dimethylsiloxane)with Periodic Wrinkling Surface and Its Application
Lee, Dong-Guk ; Oh, Chang-Kyu ; Yang, Sung-Ho ; Han, Seung-Jin ; Jeong, Ok-Chan ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 5, 2014, Pages 671~675
DOI : 10.5370/KIEE.2014.63.5.671
This paper presents a fabrication of hydrophilic Poly(dimethylsiloxane) (PDMS) with periodic wrinkling surface. The proposed periodic wrinkling surface was fabricated using the sequential processes of typical curing process of PDMS, cutting process, platinum deposition process, and wrinkling transfer process. The surface morphology of the fabricated wrinkling surface was observed by using optical and dynamic atomic force microscopy and discussed. The measured period and amplitude of wrinkling was about
, respectively. And, the contact angles of water droplets on the wrinkled surface were measured in order to understand effect of the wrinkling surface on surface modification of hydrophobic PDMS. Our new finding was that the proposed wrinkling surface was hydrophilic and the measured contact angle was about
. Moreover, it was found out from the simple cell culture test that the fabricated wrinkling surface was more effective for cell spreading and adhesion than the case of native PDMS substrate.
Design of Echo Classifier Based on Neuro-Fuzzy Algorithm Using Meteorological Radar Data
Oh, Sung-Kwun ; Ko, Jun-Hyun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 5, 2014, Pages 676~682
DOI : 10.5370/KIEE.2014.63.5.676
In this paper, precipitation echo(PRE) and non-precipitaion echo(N-PRE)(including ground echo and clear echo) through weather radar data are identified with the aid of neuro-fuzzy algorithm. The accuracy of the radar information is lowered because meteorological radar data is mixed with the PRE and N-PRE. So this problem is resolved by using RBFNN and judgement module. Structure expression of weather radar data are analyzed in order to classify PRE and N-PRE. Input variables such as Standard deviation of reflectivity(SDZ), Vertical gradient of reflectivity(VGZ), Spin change(SPN), Frequency(FR), cumulation reflectivity during 1 hour(1hDZ), and cumulation reflectivity during 2 hour(2hDZ) are made by using weather radar data and then each characteristic of input variable is analyzed. Input data is built up from the selected input variables among these input variables, which have a critical effect on the classification between PRE and N-PRE. Echo judgment module is developed to do echo classification between PRE and N-PRE by using testing dataset. Polynomial-based radial basis function neural networks(RBFNNs) are used as neuro-fuzzy algorithm, and the proposed neuro-fuzzy echo pattern classifier is designed by combining RBFNN with echo judgement module. Finally, the results of the proposed classifier are compared with both CZ and DZ, as well as QC data, and analyzed from the view point of output performance.
CPG-based Adaptive Walking for Humanoid Robots Combining Feedback
Lee, Jaemin ; Seo, Kisung ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 5, 2014, Pages 683~689
DOI : 10.5370/KIEE.2014.63.5.683
The paper introduces dynamic generation technique of foot trajectories for humanoid robots using CPG(Central Pattern Generator) and proposes adaptive walking method for slope terrains combining a feedback network. The proposed CPG based technique generates the trajectory of foot in the Cartesian coordinates system and it can change the step length adaptively according to the feedback information. To cope with variable slope terrains, the sensory feedback network in the CPG are designed using the geometry relationship between foot position and body center position such that humanoid robot can maintain its stability. To demonstrate the effectiveness of the proposed approach, the experiments on humanoid robot Nao are executed in the Webot simulation. The performance and motion features of the CPG based approach are compared and analyzed focusing on the adaptability in slope terrains.
Efficient Modifications of Cubic Convolution Interpolation Based on Even-Odd Decomposition
Cho, Hyun-Ji ; Yoo, Hoon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 5, 2014, Pages 690~695
DOI : 10.5370/KIEE.2014.63.5.690
This paper presents a modified CCI image interpolation method based on the even-odd decomposition (EOD). The CCI method is a well-known technique to interpolate images. Although the method provides better image quality than the linear interpolation, its complexity still is a problem. To remedy the problem, this paper introduces analysis on the EOD decomposition of CCI and then proposes a reduced CCI interpolation in terms of complexity, providing better image quality in terms of PSNR. To evaluate the proposed method, we conduct experiments and complexity comparison. The results indicate that our method do not only outperforms the existing methods by up to 43% in terms of MSE but also requires low-complexity with 37% less computing time than the CCI method.
Comparison of EEG Feature Vector for Emotion Classification according to Music Listening
Lee, So-Min ; Byun, Sung-Woo ; Lee, Seok-Pil ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 5, 2014, Pages 696~702
DOI : 10.5370/KIEE.2014.63.5.696
Recently, researches on analyzing relationship between the state of emotion and musical stimuli using EEG are increasing. A selection of feature vectors is very important for the performance of EEG pattern classifiers. This paper proposes a comparison of EEG feature vectors for emotion classification according to music listening. For this, we extract some feature vectors like DAMV, IAV, LPC, LPCC from EEG signals in each class related to music listening and compare a separability of the extracted feature vectors using Bhattacharyya distance. So more effective feature vectors are recommended for emotion classification according to music listening.
Communication Consecutive Test of Train Oriented Control System for Wayside Equipment Control
Baek, Jong-Hyen ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 5, 2014, Pages 703~712
DOI : 10.5370/KIEE.2014.63.5.703
To improve the efficiency and safety of railway systems, the train control system has been considerably evolved from the ground-equipment-based control system (e.g. track circuit, interlocking system, etc.) into the on-board-equipment-based control system. In addition, this train control system enables the rolling stock to intelligently control the trackside facilities by introducing the information and communication technologies (ICT). Accordingly, since the ICT-based train control system makes the railway system be simplified (i.e. the heavy ground-equipment can be removed), the efficient and cost-effective railway system can be realized. In this paper, we perform the feasibility test of the ICT-based train control system via a simulation. To this end, we have developed the prototypes of the on-board controller and wayside object control units which control the point and crossing gate and performed the integrated operation simulation in a testbed. In this paper, before the field test of the on-board-controller-based train control system, we perform the Consecutive operation test for prototypes of the on-board controller, wayside object control units and local control computer.
Development and Performance Test of DC Smart Metering System for the DC Power Measurement of Urban Railway
Jung, Hosung ; Shin, Seongkuen ; Kim, Hyungchul ; Park, Jongyoung ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 5, 2014, Pages 713~718
DOI : 10.5370/KIEE.2014.63.5.713
DC urban railway power system consists of DC power network and AC power network. The DC power network supplies electric power to railway vehicles and the AC power network supplies electric power to station electric equipment. Recently, because of power consumption reduction and peak load shaving, intelligent measurement of regenerative energy and renewable energy adapted on DC urban railway is required. For this reason, DC smart metering system for DC power network shall be developed. Therefore, in this paper, DC voltage sensor, current sensor, and DC smart meter were developed and evaluated by performance test. DC voltage sensor was developed for measuring standard voltage range of DC urban railway, and DC current sensor was developed as hall effect split core type in order to install in existing system. DC smart meter possesses function of general intelligent electric power meter, such as measuring electricity and wireless communication etc. And, DC voltage sensor showed average 0.17% of measuring error for 2,000V/50mA, and current sensor showed average 0.21% of measuring error for
in performance test. Also DC smart meter showed maximum 0.92% of measuring error for output of voltage sensor and current sensor. In similar environment for real DC power network, measuring error rate was under 0.5%. In conclusion, accuracy of DC smart metering system was confirmed by performance test, and more detailed performance will be verified by further real operation DC urban railway line test.
Transient Characteristics by Transformer %Impedance at the time of Opening the Main Circuit Breaker on the Electric Railway Vehicle
Chang, Sang-Hoon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 63, issue 5, 2014, Pages 719~725
DOI : 10.5370/KIEE.2014.63.5.719
Transient of Electric railway vehicle occurs when change to another state. The duration of the transient phenomenon only takes a few second. During this time is considered, the present of short circuit current and the normal state, the energy is present in the form of a magnetic field. Recognized by the vibration of the transient voltage or transient current at witch energy is present in the field. This paper is presented the result of transient characteristics by transformer % impedance at the time of opening and closing of the main circuit Breaker on the electric railway vehicle.