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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 65, Issue 9 - Sep 2016
Volume 65, Issue 8 - Aug 2016
Volume 65, Issue 7 - Jul 2016
Volume 65, Issue 6 - Jun 2016
Volume 65, Issue 5 - May 2016
Volume 65, Issue 4 - Apr 2016
Volume 65, Issue 3 - Mar 2016
Volume 65, Issue 2 - Feb 2016
Volume 65, Issue 1 - Jan 2016
Selecting the target year
Determining the Optimal Capacities of Distributed Generators Installed in A Stand-alone Microgrid Power System
Ko, Eun-Young ; Baek, Ja-Hyun ; Kang, Tae-Hyuk ; Han, Dong-Hwa ; Cho, Soo-Hwan ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 2, 2016, Pages 239~246
DOI : 10.5370/KIEE.2016.65.2.239
In recent years, the power demand has been increasing steadily and the occurrence of maximum power demand has been moving from the summer season to the winter season in Korea. And since the control of electric power supply and demand is more important under those situations, a micro-grid system began to emerge as a keyword for the sTable operation of electric power system. A micro-gird power system is composed of various kinds of distributed generators(DG) such as small diesel generator, wind turbine, photo-voltaic generator and energy storage system(ESS). This paper introduces a method to determine the optimal capacities of the distributed generators which are installed in a stand-alone type of microgrid power system based on the fundamental proportion of diesel generator. At first, the fundamental proportion of diesel generator will be determined by changing from 0 to 50 percent. And then we will optimize the capacities of renewable energy resources and ESS according to load patterns. Lastly, after recalculating the capacity of ESS with consideration for SOC constraints, the optimal capacities of distributed generators will be decided.
A Study on the Analysis of Lightning Damage Impact in Domestic Offshore Wind Farm
Seo, Jin-Gyu ; Kim, Kyu-Ho ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 2, 2016, Pages 247~252
DOI : 10.5370/KIEE.2016.65.2.247
The latest offshore wind turbines are easily exposed to lightning strikes because they are designed with longer blades and taller height to satisfy the growing capacity demands. The generation facilities and elements of the offshore wind farm are more vulnerable to lightning damage because of more severe, unpredictable weather conditions. Therefore, this paper presents the analysis of measure for lightning overvoltage mitigation in offshore wind farm planned in South Korea southwest seashore. The sensitivity analysis includes the steady state and transient state characteristics of offshore wind farm and proposes the countermeasure for mitigation of transient overvoltage by considering earth resistivity of the offshore environment.
A Study on Power System Analysis Considering Special-days Load Mobility of Electric Vehicle
Hwang, Sung-Wook ; Kim, Jung-Hoon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 2, 2016, Pages 253~256
DOI : 10.5370/KIEE.2016.65.2.253
In this paper, the power system with electric vehicles is analyzed considering the mobility and diffusion rate of electric vehicles in the smart grid environment. In the previous studies, load modeling and load composition rates have been researched and the results are applied to develop a new load model to explain the mobility of electric vehicles which could affect on the power system status such as power flow and stability. The results would be utilized to research and develop power system analysis methods considering movable charging characteristics of electric vehicles including movable discharging characteristics which could be affected by the diffusion progress of electric vehicles.
Analysis on Lightning Overvoltage According to Lead Length of Surge Arrester for Underground Cable Outdoor Termination Protection at C/H Tower
Jung, Chae-Kyun ; Kang, Ji-Won ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 2, 2016, Pages 257~263
DOI : 10.5370/KIEE.2016.65.2.257
This paper describes the lightning arrester transients in cable head termination. The installation references of cable head tower and lightning arresters are firstly reviewed, then the performance of lightning arrester operation is also evaluated based on lightning overvoltage analysis by the change of grounding lead cable length. This paper finally proposes the optimal length of grounding lead cable at the cable head termination. The limited lightning current is also proposed according to the change of grounding lead cable length. The results will contribute to protecting insulation breakdown failure against lightning surge at the terminations and joints.
A Study on the Decision of Appropriate Subsidy Levels Regarding Electric Vehicles for V2G as Load Management Resources
Kim, Jung-Hoon ; Hwang, Sung-Wook ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 2, 2016, Pages 264~268
DOI : 10.5370/KIEE.2016.65.2.264
Recently, various energy efficiency optimization activities are ongoing globally by integrating conventional grids with ICT (Information and Communication Technology). In this sense, various smart grid projects, which power suppliers and consumers exchange useful informations bilaterally in real time, have been being carried out. The electric vehicle diffusion program is one of the projects and it has been spotlighted because it could resolve green gas problem, fuel economy and tightening environmental regulations. In this paper, the economics of V2G system which consists of electric vehicles and the charging infrastructure is evaluated comparing electric vehicles for V2G with common electric vehicles. Additional benefits of V2G are analyzed in the viewpoint of load leveling, frequency regulation and operation reserve. To find this benefit, electricity sales is modeled mathematically considering depth of discharge, maximum capacity reduction, etc. Benefit and cost analysis methods with the modeling are proposed to decide whether the introduction of V2G systems. Additionally, the methods will contribute to derive the future production and the unit cost of electric vehicle and battery and to get the technical and economic analysis.
A Study on the Coordination Control Algorithm of Step Voltage Regulator and Battery Energy Storage System for Voltage Regulation in Distribution System
Kim, Byung-Ki ; Wang, Jong-Yong ; Park, Jea-Bum ; Choi, Sung-Sik ; Ryu, Kyung-Sang ; Rho, Dae-Seok ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 2, 2016, Pages 269~278
DOI : 10.5370/KIEE.2016.65.2.269
In order to maintain customer voltages within allowable limit(
) as much as possible, tap operation strategy of SVR(Step Voltage Regulator) installed in distribution system is very important, considering the scheduled delay time(30 sec) of SVR. However, the compensation of BESS(Battery Energy Storage System) during the delay time of SVR is being required because the customer voltages in distribution system interconnected with PV(Photovoltaic) system have a difficultly to be kept within allowable limit. Therefore, this paper presents the optimal voltage stabilization method in distribution system by using coordination operation algorithm between BESS and SVR. It is confirmed that customer voltage in distribution system can be maintained within allowable limit(
An Optimal Design of Notch Shape of IPM BLDC Motor Using the Differential Evolution Strategy Algorithm
Shin, Pan Seok ; Kim, Hong Uk ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 2, 2016, Pages 279~285
DOI : 10.5370/KIEE.2016.65.2.279
In this paper, a cogging torque of IPM(Interior Permanent Magnet)-type BLDC motor is analyzed by FE program and the optimized notch on the rotor surface is designed to minimize the torque ripple. A differential evolution strategy algorithm and a response surface method are employed to optimize the rotor notch. In order to verify the proposed algorithm, an IPM BLDC motor is used, which is 50 kW, 8 poles, 48 slots and 1200 rpm at the rated speed. Its characteristics of the motor is calculated by FE program and 4 design variables are set on the rotor notch. The initial shape of the notch is like a non-symmetric half-elliptic and it is optimized by the developed algorithm. The cogging torque of the final model is reduced to
of the initial, which is about 71 % reduction. Consequently, the proposed algorithm for the cogging torque reduction of IPM-type BLDC motor using the rotor notch design seems to be very useful to a mechanical design for reducing noise and vibration.
Optimum Shape Design of Spoke Type Motor and Magnetizer by Characteristic Analysis
Kim, Young-Hyun ; Lee, Jin-Kyoung ; Seo, Jun ; Lee, Jung-Ho ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 2, 2016, Pages 286~297
DOI : 10.5370/KIEE.2016.65.2.286
This study proposes criteria for both optimal-shape and magnetizer-system designs to be used for a high-output spoke-type motor. The study also examines methods of reducing high-cogging torque and torque ripple, to prevent noise and vibration. The optimal design of the stator and rotor can be enhanced using both a response surface method and finite element method. In addition, a magnetizer system is optimally designed for the magnetization of permanent magnets for use in the motor. Finally, this study verifies that the proposed motor can efficiently replace interior permanent magnet synchronous motor in many industries.
The Design of Radial Magnetic Force Equilibrium for Reduction of Vibration in IPM Type BLDC Motor
Lee, Gyeong-Deuk ; Lee, Won-Sik ; Kim, Gyu-Tak ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 2, 2016, Pages 298~303
DOI : 10.5370/KIEE.2016.65.2.298
In this paper, the vibration source of IPM type BLDC motor was analyzed by finite element method. The main causes of the electrical vibration were RMF(Radial magnetic force) and cogging torque. It was designed model of minimized cogging torque and RMF equilibrium. Design models were selected the optimum model using the design of experiment method. And, the vibration experiment was carried out through prototype machine of each model. Finally, the experimental results were compared with the analysis ones.
Open Fault Diagnosis Method for Five-Phase Induction Motor Driving System
Baek, Seung-Koo ; Shin, Hye-Ung ; Kang, Seong-Yun ; Park, Choon-Soo ; Lee, Kyo-Beum ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 2, 2016, Pages 304~310
DOI : 10.5370/KIEE.2016.65.2.304
This paper proposes a fault diagnosis method for an open-fault in inverter driving five-phase induction motor. The five-phase induction motor has a high output torque and small torque ripple in comparison to three-phase. The best advantage of the five-phase induction motor is fault diagnosis and tolerant control using redundancy of phases. This paper uses an inverter as a power converter for driving a five-phase induction motor. If a switch of inverter occurs to the open-fault, this problem is the influence on the output current and output torque. To solve this problem, there is need of an accurate diagnosis and fault switch distinction. Therefore, this paper propose a fault detection method of the open-fault switches for the fault diagnosis. First, analyzing the pattern for the open-circuit fault of one phase. next, analyzing the pattern for the open-circuit fault of each inverter switches. Through the pattern analysis, It defines the scope of each of the failure switch. Thereafter, By using an algorithm that proposes to perform a fault diagnosis method. The proposed algorithm is verified from the experiment with the 1.5 kW five-phase induction motor.
The DC-link Voltage Balancing of the Three-Level T-type Inverter Using the Predictive Control
Kim, Tae-Hun ; Lee, Woo-Cheol ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 2, 2016, Pages 311~318
DOI : 10.5370/KIEE.2016.65.2.311
This paper is a study on the neutral point voltage balancing of the three-phase 3-level T-type inverter using the predictive control techniques. Recently, multi-level inverter has been attracting attention as the advantages such as efficiency improving and harmonic reduction. Especially, the T-type inverter topology is advantageous in low DC-link voltage. However, in case of the prediction control, it takes a lot of time, because there exist 27 voltage vectors and it has to be calculated according to the respective voltage vectors. Therefore, in this paper, we propose a method to implement predictive control techniques while reducing the operation time. In order to reduce the operation time, the predictive control is implemented by using the minimum voltage vector except for the unnecessary voltage vector. The result of the implemented predictive control is added to the SPWM by using the offset voltage. It was verified through simulation and experimental results.
A Simplified SVPWM for Three Level Inverters to Eliminate Leakage Currents in Transformeless Photovoltaic Systems
Ansari, Arsalan ; Kim, Hee-Jun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 2, 2016, Pages 319~328
DOI : 10.5370/KIEE.2016.65.2.319
This paper proposes a simplified SVPWM for three level inverters in transformerless photovoltaic (PV) systems. With the proposed SVPWM the three level space vector (SV) diagram is divided into only six sectors as in conventional two level SV diagram in such a way that only seven SVs are used among all the available SVs of three level inverter. The main features of the proposed SVPWM are that it is simple to implement, less switching losses as compared to conventional SVPWM and most importantly it eliminates the leakage currents in transformerless PV systems. Detailed theoretical analysis of the proposed SVPWM are presented and verified by numerical simulations and experimental results.
Signal-to-noise Ratio Improvement of a FM Antenna Using a Non-Foster Circuit
Park, Hongwoo ; Kahng, Sungtek ; Kim, Hongjoon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 2, 2016, Pages 329~334
DOI : 10.5370/KIEE.2016.65.2.329
In this paper, we demonstrate a Non-Foster matching method for an electrically small antenna to improve the signal-to-noise ratio (SNR) of communication link. For the experiment, we used a general FM antenna whose resonance frequency is about 52-57 MHz and a floating type Linvill negative impedance converter(NIC)-based circuit as a Non-Foster matching element. By implementing the Non-Foster circuit to cover FM band, we can achieve a wide bandwidth matching covers 40-200 MHz. Our measurement shows 3-7 dB improvement of SNR for the same bandwidth though there are several spikes which means no improvement of SNR in the band.
Model-Based Rolling Motion Control of an One-wheeled Robot Considering the Pitching Motion of a Gyroscopic Effect
Lee, Sang-Deok ; Jung, Seul ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 2, 2016, Pages 335~341
DOI : 10.5370/KIEE.2016.65.2.335
In general, a yawing motion concept is used for the lateral control of one wheel robot where the gimbal system is located horizontally. In this paper, another concept of the vertically located gimbal system is presented for the same purpose. Although the vertical concept undergoes an instability more easily than the horizontal one, the pitching motion of the gyroscopic effect is considered. Firstly, the trade-off relation between two balancing concepts are investigated by comparing the gyroscopic mechanism. Secondly, the dynamic model for the problem of the proposed concept is derived using the oscillatory inverted stick model. Thirdly, the stability of the model is analyzed using the phase trajectory method. Finally, the control performance of the system by a vibration controller is simulated.
Obstacle Detection for Unmanned Ground Vehicle on Uneven Terrain
Choe, Tok Son ; Joo, Sang Hyun ; Park, Yong Woon ; Park, Jin Bae ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 2, 2016, Pages 342~348
DOI : 10.5370/KIEE.2016.65.2.342
We propose an obstacle detection algorithm for unmanned ground vehicle on uneven terrain. The key ideas of the proposed algorithm are the use of two-layer laser range data to calculate the gradient of a target, which is characterized as either ground or obstacles. The proposed obstacle detection algorithm includes 4-steps: 1) Obtain the distance data for each angle from multiple lidars or a multi-layer scan lidar. 2) Calcualate the gradient for each angle of the uneven terrain. 3) Determine ground or obstacle for each angle on the basis of reference gradient. 4) Generate a new distance data for each angle for a virtual laser scanner. The proposed algorithm is verified by various experiments.
Age Difference in the Cephalad Attenuation of Upper Body Accelerations During Fast Speed Walking
Jeon, Hyeong-Min ; Kim, Ji-Won ; Kwon, Yu-Ri ; Heo, Jae-Hoon ; Eom, Gwang-Moon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 2, 2016, Pages 349~353
DOI : 10.5370/KIEE.2016.65.2.349
The purpose of this study was to investigate possible age differences in the attenuation of acceleration in the upper body (from pelvis through shoulder to head) during fast walking. Thirty young and 29 elderly subjects participated in this study. Wireless acceleration sensors were attached on head, shoulder, and pelvis. Subjects performed two trials of fast walking on a treadmill, where the fast speed was defined as 1.5 times of the comfortable speed. Root-mean-squared (RMS) accelerations of each axis were compared with age group and sensor position as independent factors. In the AP direction, the pelvis acceleration was greater in the young and the shoulder-to-head attenuation was also greater in the young (p<0.001), so that the head acceleration was comparable between age groups (p
A Investment on Wire-wireless Communication Method for Electrical Device Infrastructure Maintenance
Kim, Young-Eok ; Lee, Jin ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 2, 2016, Pages 354~359
DOI : 10.5370/KIEE.2016.65.2.354
Power plants maintenance data is to be sent to management server system via a communication network. In this case, reliable communication network is required. Transmission of the power plants maintenance data is used in the wired communication network or wireless communication network. PLC communication network is a kind of wired communication network. However PLC communication network is easily affected by noise. On the vulnerable areas in power line system, such as a mountain or rural areas, it is difficult to form a power line communication network. For a wireless communication, environment are also influenced factors in wireless communication. Harsh environmental factors are bring the communication characteristic degradation. In such areas it can be used a combination of two networks and in this way the complementary function can be achieved. Power plants are distributed in various regions across the country. The appropriate communication network is needed to maintain the power plant.This study investigated the effect of environment on the wired communication and wireless communication. It would examine a variable factor which is affect to the communication characteristic. We used PLC communication for wired communication network and ZigBee communication for wireless communication network. We investigated the characteristics of a single communication network and it raised the need for a complex communication technology to complement a single communication network.
Design of Fan-shape Type PMSM for Improving Efficiency of Non-rare Earth Motor
Cho, Sooyoung ; Ahn, Hanwoong ; Ham, Sang-Hwan ; Jin, Chang-Sung ; Lee, Sung Gu ; Lee, Ju ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 2, 2016, Pages 360~364
DOI : 10.5370/KIEE.2016.65.2.360
The rare earth output is concentrated in limited number of countries including China. Also the necessity for development of non-rare earth motor is getting signified due to the rapid increase of rare earth price and resource weaponizing policies. Non-rare earth motor is generally designed as spoke type PMSM (Permanent Magnet Synchronous Motor) in order to maximize the power density. Such spoke type PMSM has advantage in concentrating the flux but demonstrates lower efficiency compared to permanent magnet using Nd (Neodymium) permanent magnet. Therefore, applications with strong necessity for efficiency need rotor structure having improved efficiency compared to spoke type PMSM. Hence, this study suggested fan-shape type PMSM with somewhat lower power density but maximized efficiency. Fan-shape type PMSM is a rotor shape demonstrating outstanding reduction of iron loss compared to existing spoke type. Thus, this study analyzed the improvement of efficiency and reduction of loss arising from the suggested shape through parameter calculation.
Analysis of Current Collection Performance Testing and Result of 350[km/h] Catenary System
Heo, Yong-Seok ; Lee, In-Hee ;
The Transactions of The Korean Institute of Electrical Engineers, volume 65, issue 2, 2016, Pages 365~369
DOI : 10.5370/KIEE.2016.65.2.365
The 350[km/h] catenary system was successfully opened in Honam high speed line. This 350[km/h] catenary system is firstly constructed in South Korea. Therefore the current collection performance of this system should be tested and evaluated by the authority. This paper describes the testings by running of HEMU-430X train and the evaluation criteria and result analysis to determine whether the performance of the catenary is good or not as a verification of catenary-pantograph interface. In detail, the contact force by pantograph, arcs by loss of contact and uplift amount of the catenary support were measured and discussed as a category of the current collection performance.