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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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The Transactions of The Korean Institute of Electrical Engineers
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Journal DOI :
The Korean Institute of Electrical Engineers
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Volume & Issues
Volume 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
Selecting the target year
Dynamic Reserve Estimating Method with Consideration of Uncertainties in Supply and Demand
Kwon, Kyung-Bin ; Park, Hyeon-Gon ; Lyu, Jae-Kun ; Kim, Yu-Chang ; Park, Jong-Keun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 11, 2013, Pages 1495~1504
DOI : 10.5370/KIEE.2013.62.11.1495
Renewable energy integration and increased system complexities make system operator maintain supply and demand balance harder than before. To keep the grid frequency in a stable range, an appropriate spinning reserve margin should be procured with consideration of ever-changing system situation, such as demand, wind power output and generator failure. This paper propose a novel concept of dynamic reserve, which arrange different spinning reserve margin depending on time. To investigate the effectiveness of the proposed dynamic reserve, we developed a new short-term reliability criterion that estimates the probability of a spinning reserve shortage events, thus indicating grid frequency stability. Uncertainties of demand forecast error, wind generation forecast error and generator failure have been modeled in probabilistic terms, and the proposed spinning reserve has been applied to generation scheduling. This approach has been tested on the modified IEEE 118-bus system with a wind farm. The results show that the required spinning reserve margin changes depending on the system situation of demand, wind generation and generator failure. Moreover the proposed approach could be utilized even in case of system configuration change, such as wind generation extension.
Optimal Placement of Distributed Generation Units Considering Voltage Sags
Song, Young-Won ; Lee, Kyebyung ; Park, Chang-Hyun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 11, 2013, Pages 1505~1510
DOI : 10.5370/KIEE.2013.62.11.1505
This paper presents a method for determining the optimal placement of distributed generation units considering voltage sags. In general, the existing methods for distributed generation placement do not consider power quality problems such as voltage sags. In this paper, a novel method based on both genetic algorithm and voltage sag assessment is proposed for determining the placement of distributed generation unit. In the proposed method, the optimal placement is determined to minimize voltage sag effects and system losses.
Optimal Allocation of Shunt Capacitor-Reactor Bank in Distribution System with Dispersed Generators Considering Installation and Maintenance Cost
Heo, Jae-Haeng ; Lyu, Jae-Kun ; Lee, Woo-Ri ; Park, Jong-Young ; Park, Jong-Keun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 11, 2013, Pages 1511~1519
DOI : 10.5370/KIEE.2013.62.11.1511
This paper proposes the allocation method for capacitor-reactor banks in a distribution system with dispersed generators to reduce the installation costs, the maintenance costs and minimize the loss of electrical energy. The expected lifetime and maintenance period of devices with moving parts depends on the total number of operations, which affects the replacement and maintenance period for aging equipment under a limited budget. In this paper, the expected device lifetimes and the maintenance period are included in the formulation, and the optimal operation status of the devices is determined using a genetic algorithm. The optimal numbers and locations for capacitor-reactor banks are determined based on the optimal operation status. Simulation results in a 69-bus distribution system with the dispersed generator show that the proposed technique performs better than conventional methods.
Study on Cost of Energy(COE) Reduction Scenario of Korean Offshore Wind Power
Sung, Jin Ki ; Lee, Jong Hoon ; Kang, Kung Suk ; Lee, Tae Jin ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 11, 2013, Pages 1520~1527
DOI : 10.5370/KIEE.2013.62.11.1520
The purpose of this study is to derive COE reduction targets of offshore wind power in Korea. In addition, innovation factors for achieving the COE reduction targets were derived. Also the COE reduction targets of offshore wind power was to improve that national policy, technology, industry and improving regulations would like to help. The results of this study has been created based on the various assumptions, scenarios and experts` discussions. Currently, offshore wind power generation price is 229.72won/kWh in 2012. According to the study, COE of offshore wind power has been proposed 88.8won/kWh at third scenario by 2030. This result has shown competitiveness with fossil fuel power generation.
Optimal Design of Stator Shape for Cogging Torque Reduction of Single-phase BLDC Motor
Park, Young-Un ; So, Ji-Young ; Chung, Dong-Hwa ; Yoo, Yong-Min ; Cho, Ju-Hee ; Ahn, Kang-Soon ; Kim, Dae-Kyong ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 11, 2013, Pages 1528~1534
DOI : 10.5370/KIEE.2013.62.11.1528
This paper proposes the optimal design of stator shape for cogging torque reduction of single-phase brushless DC (BLDC) motor with asymmetric notch. This method applied size and position of asymmetric notches to tapered teeth of stator for single-phase BLDC motor. Which affects the variation of the residual flux density of the permanent magnet. The process of optimal design included the extraction of the sampling point by using Latin Hypercube Sampling(LHS), and involved the creation of an approximation model by using kriging method. Also, the optimum point of the design variables were discovered by using the Genetic Algorithm(GA). Finite element analysis was used to calculate the characteristics analysis and cogging torque. As a result of finite element analysis, cogging torque were reduced approximately 39.2% lower than initial model. Also experimental result were approximately 38.5% lower than initial model. The period and magnitude of the cogging torque were similar to the results of FEA.
The Design of Radial Magnetic Force Equilibrium for Reduction of Vibration and Noise in IPM Type BLDC Motor
Jeong, Tae-Seok ; Cho, Gyu-Won ; Kim, Gyu-Tak ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 11, 2013, Pages 1535~1540
DOI : 10.5370/KIEE.2013.62.11.1535
In this paper, the Radial Magnetic Force(RMF) and cogging torque which cause vibration and noise in IPM type BLDC motor were analyzed. The cogging torque and RMF cause electromagnetic vibration. So, a notch was installed for the equilibrium of RMF and cogging torque reduction. The notch was analyzed by using a Fourier Series for the energy distribution of the air-gap. The equilibrium of RMF and the reduction of cogging torque were performed by a Design Of Experiment(DOE) with the notch. Also, operating characteristics and efficiency were analyzed and compared.
A Study on Torque Ripple Reduction of the Multi-degree of Freedom Operated Spherical Motor
Kang, Dong-Woo ; Lee, Ju ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 11, 2013, Pages 1541~1543
DOI : 10.5370/KIEE.2013.62.11.1541
This paper presents a spherical motor which can control in multi-degree of freedom operation. The spherical motor has been researched by many types of structure. Thhis paper shows a spherical shaped airgap and surfaced permanent magnets. Especially, The motor consists of dual rotor cores. Unlike a cylindrical motor, the spherical motor design can be considered with azimuth direction on spherical coordinates. Therefore the permanent magnet surfaced on the rotor need to be designed optimally in order to generate a sinusoidal magnetic flux density in the airgap. This paper presents results of optimal design for reducing torque ripple of the multi-degree of freedom spherical motor.
Analysis and Efficiency Control of Linear Compressor System for Refrigerator Driven by PWM Inverter
Son, Jang-Kyung ; Chun, Tae-Won ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 11, 2013, Pages 1544~1549
DOI : 10.5370/KIEE.2013.62.11.1544
Recently, the linear compressors with the free piston driven by the linear motor have widely attention in the cooling apparatus such as a refrigerator due to high efficiency. The method of using triacs as a linear motor drive is not satisfactory to improve the efficiency of the linear compressor. In this paper, the performance of the linear compressor using a PWM inverter such as the efficiency is investigated with the variations of both mechanical resonant frequency and electrical resonant frequency. The control loop for controlling both the piston stroke and efficiency is suggested. Through simulation and experimental studies, the performance of both the stroke and angle controls for improving the efficiency of the linear compressor is verified.
Single-stage Dimmable PFC DCM Flyback Converter without Electrolytic Capacitor
Jin, Dal-Rae ; Kim, Choon-Taek ; Chae, Min-Cheol ; La, Jae-Du ; Kim, Young-Seok ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 11, 2013, Pages 1550~1559
DOI : 10.5370/KIEE.2013.62.11.1550
Light emitting diode(LED) lighting has been applied various industry fields because of its high efficiency, low power consumption, long life time, and environment friendly characteristics. Generally, LED lighting needs a driver to maintain constant current. Most popular driver is the switching converter. In the converter, there are several electrolytic capacitors. However the lifespan of the electrolytic capacitor is much shorter than LED. Therefore the lifespan of LED lighting with electrolytic capacitor is decreased. Also, LED lighting needs dimming control because of various needs and energy saving. This paper presents the dimmable single-stage PFC DCM flyback converter without electrolytic capacitor and parallel LC resonant filter for reducing 120[Hz] ripple on the output. The type 2 controller is used to maintain constant current and the analog dimming control is used. The proposed converter is verified through simulation and experimental works.
Grid Current Control Scheme at Thee-Phase Grid-Connected Inverter Under Unbalanced and Distorted Grid Voltage Conditions
Tran, Thanh-Vu ; Chun, Tae-Won ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 11, 2013, Pages 1560~1565
DOI : 10.5370/KIEE.2013.62.11.1560
This paper proposes the control method for compensating for unbalanced grid current and reducing a total harmonic distortion (THD) of the grid current at the three-phase grid-connected inverter systems under unbalancd and distorted grid voltage conditions. The THD of the grid current caused by grid voltage harmonics is derived by considering the phase delay and magnitude attenuation due to the hardware low-pass filter (LPF). The Cauchy-Schwarz inequality theory is used in order to search more easily for a minimum point of THD. Both the gain and angle of a compensation voltage at the minimum point of THD of the grid current are derived. The negative-sequence components in the three-phase unbalanced grid voltage are cancelled in order to achieve the balanced grid current. The simulation and experimental results show the validity of the proposed control methods.
Electrical Properties of Organic light-emitting Diode with Oxygen Plasma Treatment
Kim, Seung-Tae ; Hong, Jin-Woong ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 11, 2013, Pages 1566~1570
DOI : 10.5370/KIEE.2013.62.11.1566
In this paper, we analyzed the electric characteristics of the OLEDs device of which anode ITO has been treated with the oxygen plasma. We fabricated the basic three-layer structure (ITO / AF /
/ Al) device, analyzed how the oxygen plasma treatments of the ITO surface affects to the electrical characteristics of OLEDs. We also produced a four-layer structure device (ITO / AF / TPD /
/ Al) with the oxygen plasma treatment. From the comparative analysis to the devices, we confirmed following results. The three-layer structure OLEDs device with oxygen plasma treatment has better characteristics than the device without the treatments; maximum luminance, luminous efficiency, and external quantum efficiency are improved approximately 151 [%], 126 [%], and 175[%], respectively. Also, the electric characteristics of the four-layer structure device with oxygen plasma treatment are improved comparing to the characteristics of the three-layer structure device with oxygen plasma treatment; maximum luminance, luminous efficiency, and external quantum efficiency are improved approximately 144 [%], 115 [%], and 124[%], respectively.
A Study on Long-time Electrical Treeing Deterioration Properties According to High Frequency Voltage of Epoxy Resin
Park, Jae-Jun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 11, 2013, Pages 1571~1577
DOI : 10.5370/KIEE.2013.62.11.1571
Electrical tree structure is one of the most important influencing factors for electrical treeing characteristics in polymers. In this paper, we focused on the structure characteristics of electrical treeing in epoxy resins (original) insulation under different high-frequency voltages (60, 500, 1000Hz). Effects of voltage frequency on the ac electrical treeing phenomena in an epoxy resins were carried out in needle-plate electrode arrangement. To measure the treeing initiation and propagation, and the breakdown rate, constant AC of 10 kV with three different voltage frequencies (60, 500 and 1,000 Hz) was applied to the specimen in needle-plate electrode specimen at
of insulating oil bath. At 60 Hz, the treeing initiation time was 360 min and the propagation rate was
, and the morphology was dense branch type. As the voltage frequency increased, the treeing initiation time decreased and the propagation rate increased. At 1,000 Hz, the treeing initiation time was 0 min and the propagation rate was
, and the morphology was dense bush type.
A Comparative Study on the PSO and APSO Algorithms for the Optimal Design of Planar Patch Antennas
Kim, Koon-Tae ; Kim, Hyeong-Seok ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 11, 2013, Pages 1578~1583
DOI : 10.5370/KIEE.2013.62.11.1578
In this paper, stochastic optimization algorithms of PSO (Particle Swarm Optimization) and APSO (Adaptive Particle Swam Optimization) are studied and compared. It is revealed that the APSO provides faster convergence and better search efficiency than the conventional PSO when they are adopted to find the global minimum of a two-dimensional function. The advantages of the APSO comes from the ability to control the inertia weight, and acceleration coefficients. To verify that the APSO is working better than the standard PSO, the design of a 10GHz microstrip patch as one of the elements of a high frequency array antenna is taken as a test-case and shows the optimized result with 5 iterations in the APSO and 28 iterations in th PSO.
Design of DNG-type Substrate-Integrated-Waveguide Resonators to Replace the Conventional Metallic Waveguide for the Military Satellite Transceiver
Kahng, Kyung-Seok ; Yang, In-Kyu ; Kahng, Sungtek ; Lee, Ho-Sub ; Lee, Hyoung-Jong ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 11, 2013, Pages 1584~1589
DOI : 10.5370/KIEE.2013.62.11.1584
A new and significantly small guided and resonant structure is suggested to take over bulky metallic hollow waveguides used in military satellite transceivers. Below Ku-band, the conventional waveguides resulting in quite heavy transceivers will be replaced by the low profile SIW(substrate integrated waveguide) structures that are distinguished from the others in that the suggested ones have much lower cut-off frequencies by the circuital configuration of DNG(dobule negative) constitutive parameters and become even smaller than the other SIWs. The design scheme is validated by the circuit and full-wave simulations from the guided, resonant, and coupled structures. Besides, a bandpass filter as the suggested coupled structure is fabricated with a cheap substrate in a low-budget fabrication process and its frequency response is measured as verification of the purpose of the design.
Electric Power Load Forecasting using Fuzzy Prediction System
Bang, Young-Keun ; Shim, Jae-Sun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 11, 2013, Pages 1590~1597
DOI : 10.5370/KIEE.2013.62.11.1590
Electric power is an important part in economic development. Moreover, an accurate load forecast can make a financing planning, power supply strategy and market research planned effectively. This paper used the fuzzy logic system to predict the regional electric power load. To design the fuzzy prediction system, the correlation-based clustering algorithm and TSK fuzzy model were used. Also, to improve the prediction system`s capability, the moving average technique and relative increasing rate were used in the preprocessing procedure. Finally, using four regional electric power load in Taiwan, this paper verified the performance of the proposed system and demonstrated its effectiveness and usefulness.
A Selection of Optimal EEG Channel for Emotion Analysis According to Music Listening using Stochastic Variables
Byun, Sung-Woo ; Lee, So-Min ; Lee, Seok-Pil ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 11, 2013, Pages 1598~1603
DOI : 10.5370/KIEE.2013.62.11.1598
Recently, researches on analyzing relationship between the state of emotion and musical stimuli are increasing. In many previous works, data sets from all extracted channels are used for pattern classification. But these methods have problems in computational complexity and inaccuracy. This paper proposes a selection of optimal EEG channel to reflect the state of emotion efficiently according to music listening by analyzing stochastic feature vectors. This makes EEG pattern classification relatively simple by reducing the number of dataset to process.
The Development of an Algorithm for the Correction of Errors in the Phase Current of the Protective Relay on Distribution System Interconnected with Distributed Generations
Shin, Dong-Yeol ; Yun, Donghyun ; Cha, HanJu ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 11, 2013, Pages 1604~1609
DOI : 10.5370/KIEE.2013.62.11.1604
When the ground fault on the power side occurs on distribution system interconnected with distributed generations, the abnormal current is generated in the neutral conductor by the connection type and the iron core structure of transformers for the interconnection of distributed power supplies due to the unbalanced voltage of the system, and subsequently the false operation of the protective relay on the load side occurs. Herein, this paper proposes the method to correct errors in the phase current to prevent the false operation of the protective relay by applying p-q theory and presents the simulation result of the error correction algorithm using PSCAD/EMTDC.
Optimal Operation Model of Heat Trade based District Heating and Cooling System Considering Start-up Characteristic of Combined Cycle Generation
Kim, Jong-Woo ; Lee, Ji-Hye ; Kim, Hak-Man ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 11, 2013, Pages 1610~1616
DOI : 10.5370/KIEE.2013.62.11.1610
Recently, district heating and cooling (DHC) systems based on combined cycle generation (CCG) providers are increasing in Korea. Since characteristics of combined heat and power (CHP) generators and heat demands of providers, heat trading between DHC providers based on the economic viewpoint is required; the heat trading has been doing. In this paper, a mathematical model for optimal operation based on heat trading between DHC providers is proposed. Especially, start-up characteristic of CCG is included. The operation model is established by mixed integer linear programming (MILP).
Development of Conductivity Standards for Metals using the van der Pauw Method
Kang, Jeon-Hong ; Yu, Kwang-Min ; Lee, Sang-Hwa ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 11, 2013, Pages 1617~1620
DOI : 10.5370/KIEE.2013.62.11.1617
The widely-used measurement methods for conductivity of non-magnetic metals are van der Pauw method, Two Point Probe method and Eddy Current method. Among them a more simpler and easier method is the Eddy Current method and an instrument using the method is a Conductivity Meter which can measure a conductivity by contacting its probe on a sample surface. However, conductivity standards are essentially needed to confirm the meter`s performance or to calibrate it. In this study, six kinds of the standards which are made of Cu, Al-1, Al-2, brass, Zn and SUS-316 are developed and conductivity ranges for the standards are 2.27 %IACS ~ 101.6 %IACS with measurement uncertainty of less than 0.3 %.
A Power Losses Analysis of AC Railway Power Feeding Network using Adaptive Voltage Control
Jung, Hosung ; Kim, Hyungchul ; Shin, Seongkuen ; Kim, Jinho ; Yoon, Kiyong ; Cho, Yonghyeun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 11, 2013, Pages 1621~1627
DOI : 10.5370/KIEE.2013.62.11.1621
This paper compares power losses between voltage controlled before and after using power conversion device in AC feeding system. For this purpose we present voltage control procedures and criteria and model high speed line and train using PSCAD/EMTDC to compare power losses in various feeding condition. Power losses of the simulation result in power control before and after in single point feeding system was reduced maximum 0.37 MW(23.8 %) and average 0.23 MW(20.5 %) when one vehicle load operates maximum load condition. When three vehicles operate maximum load condition in one feeder section, power losses after voltage control was reduced 1.03 MW(49.5%) compared to before voltage control. And, power loss of parallel feeding system is reduced the average 0.08 MW(7.2 %) compared to the single feeding system. In conclusion, adaptive voltage control method using power conversion device can reduce power losses compared with existing method.
A Study on Optimized PWM Strategy to Improve Output Voltage Quality of HEP System Boarded on 8200 Series Electric Locomotives
Lee, Eul-Jae ; Lee, Jin-Kook ; Youn, Cha-Joong ; Kim, Jae-Moon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 11, 2013, Pages 1628~1632
DOI : 10.5370/KIEE.2013.62.11.1628
HEP(Head Electric Power) system, supplying 3-phase service power to the coach vehicles, is a kind of special auxiliary power equipment which is boarded on 8200 series electric locomotives in KORAIL. This equipment shares high voltage DC link with a main propulsion converter/inverter systems. It was difficult to use high frequency PWM technique so that GTO has been used as a power device same like the main power system. Due to low PWM frequency(300Hz) of HEP inverter, the output voltage has less power quality comparing to normal SIV(Static Inverter) system. In this paper, an optimal PWM strategy is presented for new IGBT type HEP inverter system. Several PWM techniques were investigated to improve output voltage quality under fixed lower filter inductance and not high PWM frequency. Finally PC simulations have been done to clarify its availability.
Development of Section Insulator with Improved Wear Characteristics
Lee, Kiwon ; Jung, Hosung ; Park, Young ; Cho, Ho Ryung ; Lee, Sang Sik ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 11, 2013, Pages 1633~1639
DOI : 10.5370/KIEE.2013.62.11.1633
In a section of AC electric railway, a phase between the sections is different although voltage levels supplied from substations are the same. Therefore, section insulators have been installed to electrically divide between the sections. Two differenet types of section insulator, namely an overlap type and insulator type, are used. In Korean high-speed lines, overlap type section insulator has been adopted. And, insulator type is used in conventional line. The overlap type has the advantage of having no speed limit, but has the disadvantage of requiring long section length. However, the insulator type has the advantage of section length, but also has the disadvantage of having speed limit. In Korean conventional line, an insulator type one relies on the import and there is some problem with wear. In this study, we developed the insulator type section insulator which adopts Teflon tube insulation material. The Teflon material has advantage of the excellent electrical characteristics and wear-resistance characteristics for a longer expected life than that made of existing FRP. In order to compare wear characteristics between the materials, wear tests with reciprocal wear tester are performed. And dynamic behavior tests between the insulators and pantograph are also performed for showing its better dynamic characteristics.
Response Characteristic Analysis using Modeling of Propulsion System for 8200 Electric Locomotive
Jung, No-Geon ; Chang, Chin-Young ; Yun, Cha-Jung ; Kim, Jae-Moon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 11, 2013, Pages 1640~1646
DOI : 10.5370/KIEE.2013.62.11.1640
Conventional power conversion unit that is a major part of the propulsion system has applied GTO thyristor as a switching semiconductor device of main circuit since introduction of the 8200 electric locomotive. But problem that quick maintenance is difficult and its cost is increasing occurs because major components of the power conversion unit are slowly discontinued. To solve these, in this paper, it was analyzed the response characteristic of the propulsion system modeling of the 8200 electric locomotive using IGBT which is applied recently to ensure propulsion control technology. As results of response for a Propulsion system modeling, it show that a power conversion unit is controlled by PLL(Phase-locked loop) and SVPWM(Space Voltage PWM) respectively.