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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 62, Issue 12 - Dec 2013
Volume 62, Issue 11 - Nov 2013
Volume 62, Issue 10 - Oct 2013
Volume 62, Issue 9 - Sep 2013
Volume 62, Issue 8 - Aug 2013
Volume 62, Issue 7 - Jul 2013
Volume 62, Issue 6 - Jun 2013
Volume 62, Issue 5 - May 2013
Volume 62, Issue 4 - Apr 2013
Volume 62, Issue 3 - Mar 2013
Volume 62, Issue 2 - Feb 2013
Volume 62, Issue 1 - Jan 2013
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Analysis of Flashover Rate by Lightning in Korea Distribution Line using CRIEPI Method
Choi, Sun-Kyu ; Seo, Hun-Chul ; Han, Jun ; Kim, Chul-Hwan ; Lee, Byung-Sung ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 1, 2013, Pages 1~7
DOI : 10.5370/KIEE.2012.62.1.001
This paper analyzes the flashover rate by lightning in Korea distribution system. Because of random characteristics of lightning, the Monte Carlo method is applied to estimate the lightning performance. The magnitude of lightning stroke is based on the curve measured in field. The classification of direct and indirect lightning depends on the striking distance. The striking distance and flashover rate are calculated by using the method based on Central Research Institute of Electric Power Industry(CRIEPI). The distribution system and lightning is modeled by using EMTP and MATLAB, and the accuracy of modeling is discussed. The simulations for the various spacing between two adjacent surge arresters and the various grounding resistance of GW according to the existence of GW are performed and the simulation results are analyzed.
HVDC System Design for AC Network Reactive Power Control
Choi, Soon-Ho ; Choi, Jang-Hum ; Kim, Chan-Ki ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 1, 2013, Pages 8~20
DOI : 10.5370/KIEE.2012.62.1.008
This paper deals with the concept design of HVDC system for controlling AC network reactive power. HVDC system can control active power and reactive power and the control concept of reactive power is similar to SVC(Static Var Compensator). Reactive power is controlled by adjusting firing angle of HVDC system under the condition that AC filters are switched. Reactive power depends on AC voltage condition, considering the steady-state and transient state to maintain the stable operation of AC network in the viewpoint of voltage stability. Therefore, in the design stage of HVDC, the reactive power required in the AC network must be considered. For the calculation of operation angle in HVDC system, the expected reactive power demand and supply status is examined at each AC system bus. The required reactive power affects the determination of the operation angle of HVDC. That is, the range of "control deadband" of operation angle should have the capability supplying the required reactive power. Finally, the reactive power control concepts is applied to 1GW BTB Pyeongtaek-Dangjin HVDC system.
Optimal Capacity Determination Method of Battery Energy Storage System for Demand Management of Electricity Customer
Cho, Kyeong-Hee ; Kim, Seul-Ki ; Kim, Eung-Sang ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 1, 2013, Pages 21~28
DOI : 10.5370/KIEE.2012.62.1.021
The paper proposes an optimal sizing method of a customer's battery energy storage system (BESS) which aims at managing the electricity demand of the customer to minimize electricity cost under the time of use(TOU) pricing. Peak load limit of the customer and charging and discharging schedules of the BESS are optimized on annual basis to minimize annual electricity cost, which consists of peak load related basic cost and actual usage cost. The optimal scheduling is used to assess the maximum cost savings for all sets of candidate capacities of BESS. An optimal size of BESS is determined from the cost saving curves via capacity of BESS. Case study uses real data from an apartment-type factory customer and shows how the proposed method can be employed to optimally design the size of BESS for customer demand management.
A Study on the Customer Voltage Characteristic of Distribution System with Large Scale PV
Kim, Byung-Ki ; Ryu, Kyung-Sang ; Kim, Chan-Hyeok ; Rho, Dae-Seok ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 1, 2013, Pages 29~36
DOI : 10.5370/KIEE.2012.62.1.029
This paper deals with the analysis of the customer voltage characteristic in distribution system interconnected with large scale PV system. There would be many power quality issues which are caused by reverse power flow of PV system interconnected with distribution system. In order to analyze the effect of PV system on the customer voltage, detailed modeling method of distribution system and modified modelling method of PV system are proposed using PSCAD/EMTDC in this paper. So far, less than dozens KW of PV system can be simulated with the existing modelling method. Therefore, a new modeling method which can simulate the large scale PV system is proposed by considering the relationship equation on the phase and voltage in the current control algorithm. From the simulation result of proposed modelling method, it is confirmed that an optimal operation method in distribution system is suggested by analyzing the effect of PV system on customer voltage.
Design of Wound Rotor Synchronous Machine for ISG and Performance Comparison with Interior Permanent Magnet Synchronous Machine
Lee, Dongsu ; Jeong, Yun-Ho ; Jung, Sang-Yong ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 1, 2013, Pages 37~42
DOI : 10.5370/KIEE.2012.62.1.037
This paper deals with Wound Rotor Synchronous Motor (WRSM) purposely designed for Integrated Starter and Generator (ISG) installed in 42V automotive electrical system. Not only design objective and specifications of WRSM, but its adaptive design to minimize torque ripple and back-EMF Total Harmonics Distortion (THD) are considered. Furthermore, design characteristics of designed prototype have been investigated numerically in terms of torque, back EMF, loss, and efficiency, which are verified by performance comparison with Interior Permanent Magnet Synchronous Machine based on Finite Element Analysis (FEA).
A Multi-physics Simulation and Measurement for Buoyancy of Nonmagnetic Solid Object Submerged in Magnetic Liquid
Choi, Hong-Soon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 1, 2013, Pages 43~48
DOI : 10.5370/KIEE.2012.62.1.043
In this paper, magnetic buoyancy force on nonmagnetic solid object submerged in magnetic liquid was simulated and measured. For the evaluation of the force, a multi-physics approach of hydrostatic equilibrium considering magnetic body force as well as gravity is presented. The magnetic body force should be regarded as an additional forcing term in the momentum equation of hydrodynamics. It is also shown that the virtual air-gap based Kelvin's force formula is a useful method for the calculation of force distribution in the magnetic liquid. The experimental result which was performed by a load-cell measurement system agreed quantitatively well with the numerical one.
Multi-Objective Optimization of Electromagnetic Device Based on Design Sensitivity Analysis and Reliability Analysis
Ren, Ziyan ; Zhang, Dianhai ; Park, Chanhyuk ; Koh, Chang Seop ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 1, 2013, Pages 49~56
DOI : 10.5370/KIEE.2012.62.1.049
In this paper, for constrained optimization problem, one multi-objective optimization algorithm that ensures both performance robustness and constraint feasibility is proposed when uncertainties are involved in design variables. In the proposed algorithm, the gradient index of objective function assisted by design sensitivity with the help of finite element method is applied to evaluate robustness; the reliability calculated by the sensitivity-assisted Monte Carlo simulation method is used to assess the feasibility of constraint function. As a demonstration, the performance and numerical efficiency of the proposed method is investigated through application to the optimal design of TEAM problem 22--a superconducting magnetic energy storage system.
Commutation Modeling and Characteristic Analysis of DC Motor using Circuit Parameters
Kim, Young Sun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 1, 2013, Pages 57~62
DOI : 10.5370/KIEE.2012.62.1.057
Because of high torque and easiness of speed control, Direct Current(DC) motors have been used for a long time. But, its applications are limited in circumstance and performance, since they contained brush and commutator. The commutation characteristic gives effect to life and performance of the DC motor. Naturally, the commutation characteristic analysis is strongly required. In this paper, With the result of finite element analysis, The inductance is calculated each rotor position and applied to the voltage equations coupled with commutation equation. Also, contact resistances of brush/commutator assembly are considered using contact area and brush width converted with commutator segments. The time derivative term in the differential equation is solved in time difference method. This algorithm was applied to 2-pole shunt DC motor. We considered commutation characteristic by changing contact resistance between brush and commutator segment.
A Hybrid PCS Considering on a Residential Energy Storage System
Jung, Doo-Yong ; Kim, Ji-Hwan ; Choi, Seong-Chon ; Lee, Su-Won ; Han, Hee-Min ; Won, Chung-Yuen ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 1, 2013, Pages 63~69
DOI : 10.5370/KIEE.2012.62.1.063
In recent years, technology for storing a preliminary power or a surplus of photovoltaic energy is required. This technique, as well as store a preliminary energy and improve the reliability of the gird safety. This system can plan a efficient power generation through the flexibility of the power supply from the perspective of not only provider but also user. Accordingly, the realization of the smart grid can be expected. This paper proposes a hybrid PCS using a photovoltaic and a lithium-polymer battery with the characteristics of high density energy. The main energy source of a hybrid PCS is a photovoltaic, grid and the auxiliary energy source is a lithium-polymer battery. The operation of a proposed system in this paper is verified with simulation and experimental results.
A Study on the Length of Electrical Separation Joint in AF Track Circuit
Lee, Myung-Chul ; Park, Jae-Young ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 1, 2013, Pages 70~75
DOI : 10.5370/KIEE.2012.62.1.070
The electrical separation joint as a filter circuit distributes the track circuit frequency. The electrical separation joint is classified into the interval where reinforcing bars are insulated and not insulated through the length of track circuit. In case of incorrectly setting up the length of electrical separation joint, the amplitude of current on the track circuit is not over standard current which is the standard of current on the track circuit and it effects on the close frequency on track circuit. Then, it makes an accident or makes a train not receive information for train control. In this paper, the electrical separation joint model is suggested and parameters are numerically calculated in the model. Moreover, the length of electrical separation joint is analyzed and is demonstrated by uisng Matlab and PSpice program.
A Simulation of Photocurrent Loss by Reflectance of the Front Glass and EVA in the Photovoltaic Module
Lee, Sang-Hun ; Song, Hee-Eun ; Kang, Gi-Hwan ; Ahn, Hyung-Keun ; Han, Deuk-Young ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 1, 2013, Pages 76~82
DOI : 10.5370/KIEE.2012.62.1.076
The solar cell is a device to convert light energy into electric, which supplies power to the external load when exposed to the incident light. The photocurrent and voltage occurred in the device are significant factors to decide the output power of solar cells. The crystalline silicon solar cell module has photocurrent loss due to light reflections on the glass and EVA(Ethylene Vinyl Acetate). These photocurrent loss would be a hinderance for high-efficiency solar cell module. In this paper, the quantitative analysis for the photocurrent losses in the 300-1200 wavelength region was performed. The simulation method with MATLAB was used to analyze the reflection on a front glass and EVA layer. To investigate the intensity of light that reached solar cells in PV(Photovoltaic) module, the reflectance and transmittance of PV modules was calculated using the Fresnel equations. The simulated photocurrent in each wavelength was compared with the output of real solar cells and the manufactured PV module to evaluate the reliability of simulation. As a result of the simulation, We proved that the optical loss largely occurred in wavelengths between 300 and 400 nm.
The Characteristics of the Discharge According to ITO Gap by the CLHS Driving Method in AC PDP
Shin, Jae-Hwa ; Choi, Myung-Gyu ; Kim, Gun-Su ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 1, 2013, Pages 83~89
DOI : 10.5370/KIEE.2012.62.1.083
In order to reduce the power consumption in international standard IEC62087, the luminance efficiency should be improved at the low discharge load rather than at the high discharge load. Thus, this paper analysed the characteristics of the discharge at the panels with ITO Gap of
in 50-inch PDP with FHD resolution. It was well known that the long gap panel improves the luminance and the luminous efficiency. However, it is very difficult to drive the panel due to high driving voltage. When the normal driving method was applied at the panel with ITO gap of
, the phenomenon of the double peak was generated in the sustain period. We confirmed that main factor of the double peak is the self-erasing discharge. When the CLHS driving method was applied at the panel with ITO gap of
, the self-erasing discharge was improved in the sustain period. Also, the
minimum voltage of the CLHS driving method decreased about 9V and 12V compared with those of the normal driving method. Moreover, when the CLHS driving method was applied to the panel with ITO gap of
, the luminance and the luminous efficiency increased compared with those of the normal driving method. The luminance and the luminous efficiency greatly increased at the low discharge load. The less discharge load, the higher increase rate of the luminance and the luminous efficiency. Especially, the luminous efficiency at ITO gap of
increased about 26.3% at the discharge load of 4% compared with that at ITO gap of
Low Loss Power Dividing Switch for Indoor Microwave Power Distribution
Choi, Young-Kyu ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 1, 2013, Pages 90~94
DOI : 10.5370/KIEE.2012.62.1.090
A low loss power dividing switch in a indoor microwave power distribution system is proposed and designed with a various power dividing ratio. Switching characteristics are analyzed by use of the S-parameter of the switch. Newly proposed switch showed a very low return loss less than -30dB at the operating frequency of 2.45GHz. Three kinds of the switch in which we take out individually 1/2, 1/3 and 1/4 of the input power were fabricated, and measured the delivered, transmitted, and return loss power ratio. Simulated results showed that the lower power ratio is, the better accurate operating performance shows. This switch can switch the input power from 4.5% to 58% with the variance of 5% output power. The experimental results are in good agreement with the simulation within the return loss of 1%.
Design of Lyapunov Theory based State Feedback Controller for Time-Delay Systems
Cho, Hyun Cheol ; Shin, Chan Bai ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 1, 2013, Pages 95~100
DOI : 10.5370/KIEE.2012.62.1.095
This paper presents a new state feedback control approach for communication networks based control systems in which control input and output observation time-delay natures are generally occurred in practice. We first establish a generic state feedback control framework based on well-known linear system theory. A maximum time-delay value which allows critical stability of whole control system are defined to make a positive definite Lyapunov function which is mathematically composed of controlled system states. We analytically derive its control parameters by using a steepest descent optimization method in order to guarantee a stability condition through Lyapunov theory. Computer simulation is numerically carried out for demonstrating reliability of the proposed NCS algorithm and a comparative study is accomplished to prove its superiority for which the traditional control approach for NCS is made use of under same simulation scenarios.
On the Cramer-Rao Bound for Estimating Parameters of Exponentially Decaying Function under Poisson Noise
Seok, Ji-Yeong ; Kim, Jeong-Tae ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 1, 2013, Pages 101~104
DOI : 10.5370/KIEE.2012.62.1.101
We computed Cramer-Rao bound for estimating amplitude and decay parameters of exponentially decaying function under Poisson noise. Since Cramer-Rao bound is the lowest variance bound for any unbiased estimator, the computed Cramer-Rao bound can be used for evaluating the performance of estimators under Poisson noise. In addition, we show that the performance of maximum-likelihood estimator is close to the Cramer-Rao bound by simulations.
Methods for Diagnosis and Minimum PT-Loading of PEM Fuel Cell Stack
Yoo, Seoug Yeol ; Lee, Young-Hyun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 1, 2013, Pages 105~108
DOI : 10.5370/KIEE.2012.62.1.105
To resolve global environmental problems, many automobile companies are making a great deal of effort to develop so-called green-cars. One of the solutions is an electric vehicle equipped with the PEMFC (Proton Exchange Membrane Fuel Cell) stack. However, the cost of the stack, at the moment, is still too high. This obstacle must be resolved for commercialized fuel cell cars. One of the reasons for high cost is a relatively large amount of Pt (platinum) in the membrane. In this paper, a method for reducing the Pt-loading is introduced. Furthermore, the durability of the stack will be important for a company to stay competitive in world markets (in the future). For this, the diagnosis of the stack must be conducted on-line. Some diagnosis methods as key technology are also introduced in this paper.
Development of the High Reliable Safety PLC for the Nuclear Power Plants
Son, Kwang-Seop ; Kim, Dong-Hoon ; Son, Choul-Woong ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 1, 2013, Pages 109~119
DOI : 10.5370/KIEE.2012.62.1.109
This paper presents the design of the Safety Programmable Logic Controller (SPLC) used in the Nuclear Power Plants, an analysis of a reliability for the SPLC using a markov model. The architecture of the SPLC is designed to have the multiple modular redundancy composed of the Dual Modular Redundancy(DMR) and the Triple Modular Redundancy(TMR). The operating system of the SPLC is designed to have the non-preemptive state based scheduler and the supervisory task managing the sequential scheduling, timing of tasks, diagnostic and security. The data communication of the SPLC is designed to have the deterministic state based protocol, and is designed to satisfy the effective transmission capacity of 20Mbps. Using Markov model, the reliability of SPLC is analyzed, and assessed. To have the reasonable reliability such as the mean time to failure (MTTF) more than 10,000 hours, the failure rate of each SPLC module should be less than
/hour. When the fault coverage factor (FCF) is increased by 0.1, the MTTF is improved by about 4 months, thus to enhance the MTTF effectively, it is needed that the diagnostic ability of each SPLC module should be strengthened. Also as the result of comparison the SPLC and the existing safety grade PLCs, the reliability and MTTF of SPLC is up to 1.6-times and up to 22,000 hours better than the existing PLCs.
A Fault Detection and Self-Recovery System for Space-Borne Dual Ring Counters
Kwak, Seong Woo ; Yang, Jung-Min ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 1, 2013, Pages 120~126
DOI : 10.5370/KIEE.2012.62.1.120
This paper proposes a novel scheme of fault detection and self-recovery for space-borne dual ring counters subject to transient faults. The considered ring counter is equipped with hardware redundancy, but it has a limited output domain where direct access to the current state is unavailable. We employ the theory of corrective control to detect any transient fault occurring to the counter bits and to realize immediate self-recovery of the ring counter back to the normal state. The structure of the fault-tolerant controller is designed to be minimal regardless of the counter size. To validate the applicability, we implement the proposed system on a commercial FGPA board.
Physical Layer Design of Dual-Band Guardian Modem based on Quasi-Orthogonal Code
Lee, Hyeon-Seok ; Cho, Jin-Woong ; Hong, Dae-Ki ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 1, 2013, Pages 127~132
DOI : 10.5370/KIEE.2012.62.1.127
In this paper, we design the physical layer of Guardian modem for wireless public networks. The physical layer is composed of a dual-band RF (Radio Frequency) transceiver and a baseband-processor with quasi-orthogonal codes. The 2.4/5GHz dual-band RF transceiver can overcome the communication difficulty of dense 2.4GHz band for wireless public environment. Also the quasi-orthogonal code can reduce the required ASIC (Application Specific Integrated Circuit) design area. Finally, we analyze the performance of the developed system in viewpoint of data rate, BER (Bit Error Rate), PER (Packet Error Rate). Moreover we verify the performance of the dual-band RF communication.
Subband Adaptive Algorithm for Convex Combination of LMS based Transversal Filters
Sohn, Sang-Wook ; Lee, Kyeong-Pyo ; Choi, Hun ; Bae, Hyeon-Deok ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 1, 2013, Pages 133~139
DOI : 10.5370/KIEE.2012.62.1.133
Convex combination of two adaptive filters is an efficient method to improve adaptive filter performances. In this paper, a subband convex combination method of two adaptive filters for fast convergence rate in the transient state and low steady state error is presented. The cost function of mixing parameter for a subband convex combination is defined, and from this, the coefficient update equation is derived. Steady state analysis is used to prove the stability of the subband convex combination. Some simulation examples in system identification scenario show the validity of the subband convex combination schemes.
Chaotic Prediction Based Channel Sensing in CR System
Gao, Xiang ; Lee, Juhyeon ; Park, Hyung-Kun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 1, 2013, Pages 140~142
DOI : 10.5370/KIEE.2012.62.1.140
Cognitive radio (CR) has been recently proposed to dynamically access unused-spectrum. Since the spectrum availability for opportunistic access is determined by spectrum sensing, sensing control is identified as one of the most crucial issues of cognitive radio networks. Out-of-band sensing to find an available channels to sense. Sensing is also required in case of spectrum hand-off. Sensing process needs to be done very fast in order to enhance the quality of service (QoS) of the CR nodes, and transmission not to be cut for longer time. During the sensing, the PU(primary user) detection probability condition should be satisfied. We adopt a channel prediction method to find target channels. Proposed prediction method combines chaotic global method and chaotic local method for channel idle probability prediction. Global method focus on channel history information length and order number of prediction model. Local method focus on local prediction trend. Through making simulation, Proposed method can find an available channel with very high probability, total sensing time is minimized, detection probability of PU's are satisfied.
Operational Characteristics of the High-speed Interrupter for Reliability Enhancement of Power Supply and Demand
Choi, Hye-Won ; Choi, Hyo-Sang ; Jung, Byung-Ik ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 1, 2013, Pages 143~148
DOI : 10.5370/KIEE.2012.62.1.143
When the fault occurs in power system, the fault-current exceeds breaking capacity of the circuit breaker. So, reliablity of the power system is decreased sharply. Superconducting fault-current limiter (SFCL) is operated without impedance in normal state. The fault-current is limited by its impedance during the fault condition. However, the SFCL has several weak points such as huge size, high-price, liquid-nitrogen operation for the real power system. In this paper, We suggested the high-speed interrupter to limit the fault-current in case of the single line-to-ground fault. In addition, we compared the high-speed interrupter with the SFCL to ensure the operation reliability. The proposed interrupter detected the fault-current through the CT, and the power was supplied by operation of the SCR control system. In this experiment, the power of high-speed interrupter was applied after the 4.8[msec] from fault instant. The on-off operation of the interrupter was started after half-cycle from the fault. The fault-current was flowed into the impedance element by the switching operation of the high-speed interrupter. So, the fault current was limited within one cycle, and then it didnt exceed the capacity of a circuit breaker. We confirmed that there was slight difference between the SFCL with high-speed interrupter in terms of limiting-time of the fault-current and switching speed of the SCR. The high-speed interrupter was considered to be more efficient than the SFCL in size, cost or reliability.