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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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A Development of Monitoring and Control System for Improved the Voltage Stability in the Power System
Lee, Hyun-Chul ; Jeoung, Ki-Suk ; Park, Ji-Ho ; Baek, Young-Sik ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 4, 2013, Pages 437~443
DOI : 10.5370/KIEE.2013.62.4.437
This paper was developed a monitoring and control system to use reactive power control algorithm. This algorithm could be improved voltage stability in power system. This method was controlled the voltage for stability improvement, effective usage of reactive power, and the increase of the power quality. PMS(Power Management System) has been calculate voltage sensitivity, and control reactive power compensation device. The voltage control was used to the FACTS, MSC/MSR(Mechanically Switched Capacitors/Reactors), and tap of transformer in power system. The reactive power devices in power system were control by voltage sensitivity ranking of each bus. Also, to secure momentary reactive power, it had been controlled as the rest of reactive power in the each bus. In here, reactive power has been MSC/MSR. The simulation result, First control was voltage control as fast response control of FACTS. Second control was voltage control through the necessary reactive power calculation as slow response control of MSR/MSR. Third control was secured momentary reactive reserve power. This control was method by cooperative control between FACTS and MSR/MSC. Therefore, the proposed algorithm was had been secured the suitable reactive reserve power in power system.
A Study on the Criteria for Setting the Dynamic Control Mode of Battery Energy Storage System in Power Systems
Han, Jun Bum ; U, Garam ; Kook, Kyung Soo ; Chang, Byunghoon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 4, 2013, Pages 444~450
DOI : 10.5370/KIEE.2013.62.4.444
This paper presents the criteria for setting the dynamic operating mode of BESS(Battery Energy Storage System) in the bulk power systems. ESS has been expected to improve the degraded dynamic performance of the power system with high penetration of the renewable resources. While ESS is controlled in steady state or dynamic operating mode for its better effectiveness depending on the operating conditions of power systems, the criteria for setting the dynamic operating mode for the transient period needs to be robust enough to cover all the different conditions. The proposed criteria consider the varying conditions and the operating practices of the bulk power systems.
A Study on Siting of HVAC Offshore Substation for Wind Power Plant using Submarine Cable Cost Model
Won, Jong-Nam ; Moon, Won-Sik ; Huh, Jae-Sun ; Kim, Jae-Chul ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 4, 2013, Pages 451~456
DOI : 10.5370/KIEE.2013.62.4.451
Development of the technologies for offshore wind power is proceeding actively and the installation capacity is continuously increasing because of its many advantages in comparison with the land wind power. Accordingly, project for Southwestern 2.5GW offshore wind power plant is in progress in Korea. Design of electric power systems for offshore wind power plant is very important due to its high investment and operational costs. Hence, it needs to be designed in order to minimize costs. This way can be employed in determining the installation location of offshore substation for HVAC wind power plant. According to the offshore substation site, MV inter-array cable and HV export cable lengths vary and they change a total cost regarding submarine cable. This paper represents cost models with variables which are MV inter-array cable and HV export cable lengths to locate the offshore substation for HVAC wind power plant. It is classified into submarine cable installation cost, reactive power compensator installation cost, ohmic losses, and unsupplied energy cost. By minimizing a total cost, an appropriate installation site of the offshore substation is determined.
Evaluation of Ramping Capability for Day-ahead Unit Commitment considering Wind Power Variability
Lyu, Jae-Kun ; Heo, Jae-Haeng ; Park, Jong-Keun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 4, 2013, Pages 457~466
DOI : 10.5370/KIEE.2013.62.4.457
Wind energy is rapidly becoming significant generating technologies in electricity markets. As probabilistic nature of wind energy creates many uncertainties in the short-term scheduling, additional actions for reliable market operation should be taken. This paper presents a novel approach to evaluate ramping capability requirement for changes in imbalance energy between day-ahead market and real-time market due to uncertainty of wind generation as well as system load. Dynamic ramp rate model has been applied for realistic solution in unit commitment problem, which is implemented in day-ahead market. Probabilistic optimal power flow has been used to verify ramping capability determined by the proposed method is reasonable in economic and reliable aspects. This approach was tested on six-bus system and IEEE 118-bus system with a wind farm. The results show that the proposed approach provides ramping capability information to meet both forecasted variability and desired confidence level of anticipated uncertainty.
Study on the algorithm for the Reasonable Switch Automation Rate with Customer Interruption Cost and Reliability Evaluation
Chai, Hui-Seok ; Shin, Hee-Sang ; Cho, Sung-Min ; Moon, Jong-Fil ; Kim, Jae-Chul ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 4, 2013, Pages 467~473
DOI : 10.5370/KIEE.2013.62.4.467
The addition of disconnect switches to a distribution feeder or the replacement of the manual switches with the automatic switches do, in general, increase reliability by decreasing the duration of the outage of many to the customers on the feeder and reducing the outage section. However, the improvement of reliability in power distribution system causes an increase of the investment cost, for example, replacement costs, labor costs, and so on. For this reason - the balance between investment and reliability improvement - many studies about the appropriate level of investment have been conducted. In this paper, we suggest the algorithm for determining the reasonable switch automation rate in the power distribution system. We evaluate the customer interruption cost and reliability for several cases - these cases relate with the switch automation rate - in the domestic metropolitan power distribution system, estimate the effectiveness of changing the manual switch to automatic switch quantitatively. These results can help the determining on the disconnect switch's automation rate.
Lightning Overvoltage Analysis According to Interval of Arrester and Overhead Grounding Wire in DC Distribution System
An, Chun-Yong ; Lee, Jong-Beom ; Kim, Yong-Kap ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 4, 2013, Pages 474~481
DOI : 10.5370/KIEE.2013.62.4.474
It is anticipated that AC distribution system can be replaced by DC distribution system in the near future because of the operation of various distributed source or microgrid system. However DC distribution system replacing 22.9kV AC distribution line is not sufficiently studied still. This paper describes lightning overvoltage analysis among many research fields should be studied to realize DC overhead distribution systems. DC distribution system is modeled using EMTP and overvoltage is analyzed according to interval of arrestor location, earth interval of overhead grounding wire and grounding resistance. It is evaluated that analysis results can be effectively used to design of future DC distribution system.
Short-Term Load Forecast for Summer Special Light-Load Period
Park, Jeong-Do ; Song, Kyung-Bin ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 4, 2013, Pages 482~488
DOI : 10.5370/KIEE.2013.62.4.482
Load forecasting is essential to the economical and the stable power system operations. In general, the forecasting days can be classified into weekdays, weekends, special days and special light-load periods in short-term load forecast. Special light-load periods are the consecutive holidays such as Lunar New Years holidays, Korean Thanksgiving holidays and summer special light-load period. For the weekdays and the weekends forecast, the conventional methods based on the statistics are mainly used and show excellent results for the most part. The forecast algorithms for special days yield good results also but its forecast error is relatively high than the results of the weekdays and the weekends forecast methods. For summer special light-load period, none of the previous studies have been performed ever before so if the conventional methods are applied to this period, forecasting errors of the conventional methods are considerably high. Therefore, short-term load forecast for summer special light-load period have mainly relied on the experience of power system operation experts. In this study, the trends of load profiles during summer special light-load period are classified into three patterns and new forecast algorithms for each pattern are suggested. The proposed method was tested with the last ten years' summer special light-load periods. The simulation results show the excellent average forecast error near 2%.
Investigation of Loss Analysis Method using Integral Equation Method for Power Transformers
Bae, Byunghyun ; Lee, Seungwook ; Choi, Jongung ; Park, Seokweon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 4, 2013, Pages 489~494
DOI : 10.5370/KIEE.2013.62.4.489
In analysis of power transformer loss using calculation of magnetic field, Finite element method is commonly used. When using this method, calculation of magnetic field needs the very large number of elements and the performance of common work station is not sufficient to calculate the magnetic fields. In addition, the definition of boundary conditions may arise. However, When using Integral equation method, only ferromagnetic materials need to be modeled, since the domain is infinite. All the space in which the primary and secondary sources exist is regarded as free(
Optimized Design of Rotor Considering Cost-Reduction of Small BLDC Motor for the Water Pump
Kim, Hoe-Cheon ; Jung, Tae-Uk ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 4, 2013, Pages 495~501
DOI : 10.5370/KIEE.2013.62.4.495
In the present study, a BLDC motor for a pump in which a neodymium PM is replaced with a Ferrite PM has been developed in preparation for the cost increase and to ensure the stability of the resource supply. One of the currently used motors for pumps is a BLDC motor having an interior PM wherein a rare-earth PM is adopted. However, a BLDC motor for a pump is designed to have large airgap because of the use of a waterproof insulator according to its structural characteristics, and therefore, a SPM structure is suitable. Hence, an SPM BLDC motor in which a Ferrite PM is used is designed. Nevertheless, the use of Ferrite instead of rare-earth materials causes a deterioration in the performance of the electric motor, such as a decrease in the BEMF and the maximum power of the motor and the irreversible demagnetization of the PM. In order to mitigate such disadvantages, an optimized design of the BLDC motor is developed by changing each design parameter and by improving the electromagnetism structure.
Efficient Switching Pattern to Decrease Switching Losses in Cascaded H-bridge PWM Multilevel Inverter
Jeong, Bo Chang ; Kim, Sun-Pil ; Kim, Kwang Soo ; Park, Sung-Jun ; Kang, Feel-Soon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 4, 2013, Pages 502~509
DOI : 10.5370/KIEE.2013.62.4.502
It presents an efficient switching pattern, which expects a reduction of switching losses in a cascaded H-bridge PWM multilevel inverter. By the proposed switching scheme, the lower H-bridge module operates at low frequency of 60[Hz] because it assigns to transfer most load power. The upper H-bridge module operates at high frequency of PWM switching to improve THD of output voltage. The proposed switching pattern applies to cascaded H-bridge multilevel inverter with PD, APOD, bipolar, and unipolar switching methods. By computer-aided simulations, we verify the validity of the proposed switching scheme. Finally, we prove that the proposed PD and APOD switching patterns are better than those of the conventional one in efficiency.
Analysis and Design of a 3-phase Series-Resonant type High Voltage Capacitor Charger
Lee, Byungha ; Park, Sangeun ; Cha, Hanju ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 4, 2013, Pages 510~516
DOI : 10.5370/KIEE.2013.62.4.510
This paper suggests a 3-phase series-resonant type high voltage capacitor charger for an EML pulsed power system. The operating principle on the charger is explained by an equivalent circuit. Additionally, we analyze the charging characteristic in one discontinuous conduction mode and three continuous conduction modes. The analysis shows that the resonant current per phase is two thirds of the 3-phase charger's average charging current and one third of the single-phase charger's average charging current with the same capacity. We suggest a design method of the 3-phase capacitor charger in each operational mode and present an example of 3.5 kW capacitor charger at
. The 3.5 kW 3-phase capacitor charger prototype is assembled with a TI28335 controller and a 40 kJ, 7 kV capacitor. The design rules based on the analysis are verified by experiment.
A Method to Suppress the Spurious Radiation due to the Current Pulse on the Cable using the Frequency Selective Metamaterial Structure
Kahng, Sungtek ; Yang, Inkyu ; Kim, Hyeong-Seok ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 4, 2013, Pages 517~522
DOI : 10.5370/KIEE.2013.62.4.517
The spurious electromagnetic radiation is generated due to the RF unbalanced current on a conductive cable connecting an electronic device to another. A metamaterial-based filtering geometry with frequency selectivity is suggested to reduce the radiation with a bandgap structure, where the right-handed inductance and capacitance stem from the transmission-like configuration between the cable and the metal protrusion, and the left-handed components come from the narrow cavities. The effect of the structure on the unbalanced current pulse and its spurious radiation is presented in the FDTD-method frame work.
Design of a Guide Vane for Improving Inside Flow Uniformity of Electrostatic Precipitator
Noh, Kyung-Wook ; Bae, Seong-Jun ; Park, Sookhee ; Kang, Sunkyun ; Lee, Jangmyung ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 4, 2013, Pages 523~528
DOI : 10.5370/KIEE.2013.62.4.523
In recent years, many efforts are increasingly being made to conserve the natural environment with enhanced emission standards and air quality standards. Also there are various methods necessary to be researched to minimize the emission of air pollutants. In particular, boilers of industrial facilities are major portions of the air pollution. The front duct which needs to be designed to reduce the gases to the electrostatic precipitator requires a bent tube, a reduction/extend tube and an auxiliary equipment, that is, a guide vane. This paper proposes an optimum design of the guide vane by a case study for electrostatic precipitator's flow uniformity. The operating conditions of this study are as follows: BMCR (Boiler Maximum Continuous Rate) and MGR (Maximum Guaranteed Rate) are 75%, 50%, and 30%; turbulent fluid dynamics model is based upon K-
formulation. Presentation of the computed motion of particles is found to be quite useful to predict the precipitator performance by use CFD (Computational Fluid Dynamics).
Delay-dependent Robust Stability of Discrete-time Uncertain Delayed Descriptor Systems using Quantization/overflow Nonlinearities
Kim, Jong-Hae ; Oh, Do-Cang ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 4, 2013, Pages 529~535
DOI : 10.5370/KIEE.2013.62.4.529
This paper considers the problem of robust stability for uncertain discrete-time interval time-varying delayed descriptor systems using any combinations of quantization and overflow nonlinearities. First, delay-dependent linear matrix inequality (LMI) condition for discrete-time descriptor systems with time-varying delay and quantization/overflow nonlinearities is presented by proper Lyapunov function. Second, it is shown that the obtained condition can be extended into descriptor systems with uncertainties such as norm-bounded parameter uncertainties and polytopic uncertainties by some useful lemmas. The proposed results can be applied to both descriptor systems and non-descriptor systems. Finally, numerical examples are shown to illustrate the effectiveness and less conservativeness.
A Hexapod Robot that can Walk Fast
Seo, Hyeon Se ; Sung, Young Whee ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 4, 2013, Pages 536~543
DOI : 10.5370/KIEE.2013.62.4.536
In this paper, we propose a new type of hexapod robot that can walk fast. Most of the conventional hexapod robots are either rectangular type of hexagonal type. Those robots have drawbacks in the speed and stability of walking. The proposed robot has six legs, one fore leg, one hind leg, two left legs and two right legs. The proposed robot forms relatively wide supporting polygons along the walking direction, so it can walk very fast stably. We implemented the proposed hexapod robot and showed the feasibility of the robot by 3+3 walking experiment and 2+4 walking experiment.
A Study on Three Phase Partial Discharge Pattern Classification with the Aid of Optimized Polynomial Radial Basis Function Neural Networks
Oh, Sung-Kwun ; Kim, Hyun-Ki ; Kim, Jung-Tae ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 4, 2013, Pages 544~553
DOI : 10.5370/KIEE.2013.62.4.544
In this paper, we propose the pattern classifier of Radial Basis Function Neural Networks(RBFNNs) for diagnosis of 3-phase partial discharge. Conventional methods map the partial discharge/noise data on 3-PARD map, and decide whether the partial discharge occurs or not from 3-phase or neutral point. However, it is decided based on his own subjective knowledge of skilled experter. In order to solve these problems, the mapping of data as well as the classification of phases are considered by using the general 3-PARD map and PA method, and the identification of phases occurring partial discharge/noise discharge is done. In the sequel, the type of partial discharge occurring on arbitrary random phase is classified and identified by fuzzy clustering-based polynomial Radial Basis Function Neural Networks(RBFNN) classifier. And by identifying the learning rate, momentum coefficient, and fuzzification coefficient of FCM fuzzy clustering with the aid of PSO algorithm, the RBFNN classifier is optimized. The virtual simulated data and the experimental data acquired from practical field are used for performance estimation of 3-phase partial discharge pattern classifier.
Design of Modeling & Simulator for ASP Realized with the Aid of Polynomiai Radial Basis Function Neural Networks
Kim, Hyun-Ki ; Lee, Seung-Joo ; Oh, Sung-Kwun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 4, 2013, Pages 554~561
DOI : 10.5370/KIEE.2013.62.4.554
In this paper, we introduce a modeling and a process simulator developed with the aid of pRBFNNs for activated sludge process in the sewage treatment system. Activated sludge process(ASP) of sewage treatment system facilities is a process that handles biological treatment reaction and is a very complex system with non-linear characteristics. In this paper, we carry out modeling by using essential ASP factors such as water effluent quality, the manipulated value of various pumps, and water inflow quality, and so on. Intelligent algorithms used for constructing process simulator are developed by considering multi-output polynomial radial basis function Neural Networks(pRBFNNs) as well as Fuzzy C-Means clustering and Particle Swarm Optimization. Here, the apexes of the antecedent gaussian functions of fuzzy rules are decided by C-means clustering algorithm and the apexes of the consequent part of fuzzy rules are learned by using back-propagation based on gradient decent method. Also, the parameters related to the fuzzy model are optimized by means of particle swarm optimization. The coefficients of the consequent polynomial of fuzzy rules and performance index are considered by the Least Square Estimation and Mean Squared Error. The descriptions of developed process simulator architecture and ensuing operation method are handled.
A Variable Data Rate Speech Coding Technique Based on the Inflection Point Detection of Speech
Iem, Byeong-Gwan ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 4, 2013, Pages 562~565
DOI : 10.5370/KIEE.2013.62.4.562
A new variable rate speech coding technique is proposed. The method is based on the observation that the speech signal approximately looks linear for a very short period of time. The information transmitted is the location and data value of inflection points. If the distance between the inflection points is large, the mid point location and its data value are also delivered. Thus, the encoder transmits both the location and the data value for the inflection samples, but the location only for the non-inflection points. The location information is expressed using one bit for each sample, 0 for non-inflection and 1 for inflection point. At the receiver, using the interpolation, the decoder estimates the untransmitted sample values for non-inflection locations from the received sample values for the inflection samples. With 50 % of computational cost of the existing CVSD delta modulation, the proposed method is expected to achieve the data rate of 36 to 38 kbps and the SNR of 10 to 13 dB.
Islanded Microgrid Simulation using Hardware-in-the Loop Simulation (HILS) System based on OPAL-RT
Yoo, Hyeong-Jun ; Kim, Hak-Man ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 4, 2013, Pages 566~572
DOI : 10.5370/KIEE.2013.62.4.566
A microgrid is a small scale power system. The microgrid is operated in two operation modes, the grid-connected mode and the islanded mode. In the islanded mode, the frequency of a microgrid should be maintained constantly. For this, the balance between power supply and power demand during islanded mode should be met. In general, energy storage systems (ESSs) are used to solve power imbalance. In this paper, the frequency control effect of a Lithium-ion battery energy storage system (Li-ion BESS) has been tested on the hardware-in-the loop simulation (HILS) system environment.
Analysis of Current Collection Performance using Real-time Measurement of Current for Overhead Contact Line on the Track-side
Park, Young ; Shin, Seung-Kwon ; Lee, Kiwon ; Kim, Jaemoon ; Kim, Wonha ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 4, 2013, Pages 573~576
DOI : 10.5370/KIEE.2013.62.4.573
In this paper, analysis method for current collection performance based on real-time current of catenary system is proposed. An innovative method based on track-side of railway system is used for measurement of currents for overhead contact line during the collection with pantograph. The evaluation of a qualitative ratio for current collection performance were conducted using proposed algorithm under various conditions such as laboratory and track-side. To check the validity of our approach, we compared between calculation results from current of contact wire and measurement results from arcing of pantograph using simulator in laboratory conditions. The results show that the behavior of current collection performance were analysis from currents of overhead contact line in AC electric railway system.
An Analysis of Influence Between the Power Feeding Line Insulation and Negative Rail Potential for the DC Ground Fault Protection in the Rubber Wheel System
Jung, Hosung ; Shin, Seongkuen ; Kim, Hyungchul ; Park, Young ; Cho, Sanghoon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 4, 2013, Pages 577~583
DOI : 10.5370/KIEE.2013.62.4.577
We have analyzed influence of potential rise in negative bus, which caused by decrease of power feeding line insulation, upon protecting method of DC ground protection device which detecting potential rise between negative bus and ground in order to detect ground fault in the rubber wheel system. For this purpose, we proposed negative potential equation between negative bus and ground and calculated negative potential according to system condition changes by estimating power feeding line insulation changes in steel wheel system and rubber wheel system, and equalizing DC power feeding system when ground fault occurred. Also, in order to estimate negative potential of real system, we modeled the rubber wheel system, and simulated normal status, grounding fault occurrence and power feeding line insulation changes. In normal status, negative potential did not rise significantly regardless of vehicle operation. When ground fault occurred, negative potential rose up over 300V regardless of fault resistance. However, we also observed that negative potential rose when power feeding line insulation dropped down under
. In conclusion, our result shows that in case of rubber wheel system unlike steel wheel system, relay will be prevented maloperation and insulation status observation can be ensured when ground over voltage relay will be set 200V ~ 300V.
Analysis of Return Current Effect for AF Non-insulated Track Circuit in ITX Vehicle Operation
Beak, Jong-Hyen ; Kim, Yong-Kyu ; Yoon, Yong-Ki ; Jang, Dong-Wook ; Shin, Dong-Ho ;
The Transactions of The Korean Institute of Electrical Engineers, volume 62, issue 4, 2013, Pages 584~590
DOI : 10.5370/KIEE.2013.62.4.584
Depending on the operating characteristics, track circuit is installed for the purpose of control directly or indirectly of the signal device, point switch machine and other security device. These are mainly used for train detection, transmission of information, broken train detection and transmission of return current. Especially, the return current is related to signal system, power system and catenary line, and track circuit systems. It is one of the most important component shall be dealt for the safety of track side staff and for the protection of railway-related electrical system according to electrification. Therefore, an accurate analysis of the return current is needed to prevent the return current unbalance and the system induced disorder and failure due to an over current condition. Also, if the malfunction occurred by the return current harmonics, it can cause problems including train operation interruption. In this paper, we presented measurement and analysis method at return current and it's harmonics by train operation. By the test criteria, we evaluated for safety. Hereafter, it is expected to contribute to the field associated with it.