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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 64, Issue 12 - Dec 2015
Volume 64, Issue 11 - Nov 2015
Volume 64, Issue 10 - Oct 2015
Volume 64, Issue 9 - Sep 2015
Volume 64, Issue 8 - Aug 2015
Volume 64, Issue 7 - Jul 2015
Volume 64, Issue 6 - Jun 2015
Volume 64, Issue 5 - May 2015
Volume 64, Issue 4 - Apr 2015
Volume 64, Issue 3 - Mar 2015
Volume 64, Issue 2 - Feb 2015
Volume 64, Issue 1 - Jan 2015
Selecting the target year
Short-term Electric Load Forecasting for Summer Season using Temperature Data
Koo, Bon-gil ; Kim, Hyoung-su ; Lee, Heung-seok ; Park, Juneho ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 8, 2015, Pages 1137~1144
DOI : 10.5370/KIEE.2015.64.8.1137
Accurate and robust load forecasting model is very important in power system operation. In case of short-term electric load forecasting, its result is offered as an standard to decide a price of electricity and also can be used shaving peak. For this reason, various models have been developed to improve forecasting accuracy. In order to achieve accurate forecasting result for summer season, this paper proposes a forecasting model using corrected effective temperature based on Heat Index and CDH data as inputs. To do so, we establish polynomial that expressing relationship among CDH, load, temperature. After that, we estimate parameters that is multiplied to each of the terms using PSO algorithm. The forecasting results are compared to Holt-Winters and Artificial Neural Network. Proposing method shows more accurate by 1.018%, 0.269%, 0.132% than comparison groups, respectively.
Reactive Power Traceable System based Vulnerable Areas Detection for Reactive Power
Choi, YunHyuk ; Bae, MoonSung ; Lee, Byongjun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 8, 2015, Pages 1145~1153
DOI : 10.5370/KIEE.2015.64.8.1145
The paper analyzes reactive power flow characteristic in power system by reactive power tracing. In addition, virtual buses are inserted in the algorithm to consider losses of transmission lines, and shunt capacitor treated as a reactive power generator. The results of simulation are analyzed by two points of view. The one is load’s point of view and another is generator’s point of view. Classic purpose of the reactive power tracing consists in the reactive power pricing. However, it is significantly used to select vulnerable area about line outage in this paper. To find the vulnerable area, reactive power tracing variations between pre-contingency and post-contingency are calculated at all load buses. In heavily load area, buses which has highest variation become the most vulnerable bus. This method is applied to the IEEE 39-bus system. It is compared with voltage variation result and VQ-margin to verify its effect.
Thermal Characteristics Analysis by Ambient and Operating Temperature according to the Kinds of Terminations in Underground Power Cable Systems
Jung, Chae-Kyun ; Kang, Ji-Won ; Lee, Bang-Wook ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 8, 2015, Pages 1154~1160
DOI : 10.5370/KIEE.2015.64.8.1154
This paper describes the thermal characteristics of underground power cable system terminations according to the change of ambient temperature as well as operating temperature. Recently, the failure has been gradually increasing in outdoor termination during winter season because the power demand was increased by electricity heating system. The power demand and outdoor temperature is difference between day time and night time. The temperature difference has an influence on conductor extension and shrinkage due to conductor force as well as thermal mechanical characteristics. These phenomena have daily repeated during heating and cooling period of conductors. In these cases, the insulation of outdoor terminations might be degraded by the reduced interface pressure surrounding stress relief cone. Therefore, in this paper, the thermal characteristics are variously analysed by simulation considering power demand and ambient temperature condition during winter season at epoxy type termination as well as slip-on type termination
Application Management System with ZeroMQ and Alarms in Distribution Management System
Kim, Pil-Seok ; Kang, Ho-Young ; Lim, Il-Hyung ; Park, Jong-Ho ; Shin, Yong-Hak ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 8, 2015, Pages 1161~1167
DOI : 10.5370/KIEE.2015.64.8.1161
Distribution Management System(DMS) ienhancing distribution automation system-based operation efficiency is an optimized system by various operational applications in a distribution network. DMS employs various applications like topology reconfiguration, volt/var control, and restoration at events such as overload, voltage violation, and a fault in a distribution system. An operation efficiency to employ multi-applications as restoration with short-term load forecasting is higher than a performance by a single application; and the applications are accomplished by an operator’s control. Applications’ combination is determined by various alarm information which means critical issues in order to operate a distribution system. Thus, this paper proposes an application management system which can configure application combination, control applications depending on alarm information and check their performance condition. The proposed application management system can be customized by operator easily and have high operation efficiency and reliability because it is worked by reviewed alarm information from operator.
Voltage and Frequency Control Method Using Battery Energy Storage System for a Stand-alone Microgrid
Kim, Sang-Hyuk ; Chung, Il-Yop ; Lee, Hak-Joo ; Chae, Woo-Kyu ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 8, 2015, Pages 1168~1179
DOI : 10.5370/KIEE.2015.64.8.1168
This paper presents voltage and frequency control methods for a stand-alone Gasa Island Microgrid in South Korea that can be fully energized by renewable energy resources such as photovoltaic systems and wind turbines. To mitigate the variations of the output of renewable energy resources and supply more reliable electricity to customers, battery energy storage systems (BESSs) are employed in the stand-alone microgrid. The coordination between BESSs and pre-existing diesel generators is an important issue to manage the microgrid more securely. This paper presents voltage and frequency control schemes considering the coordination of BESSs and DGs. The effectiveness for the operating method is validated via simulation studies.
Automated Inductance Measurement of a Switched Reluctance Motor Using Voltage Integration Method
Noh, Jeongmin ; Kim, Jaehyuck ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 8, 2015, Pages 1180~1185
DOI : 10.5370/KIEE.2015.64.8.1180
This paper describes the accurate inductance measurement of a switched reluctance motor (SRM). Conventionally, the inductance of the SRM is measured using the equivalent circuit of a stator phase or time constant of exponential current transient. This paper presents an effective method to measure the SRM inductance accurately and rapidly using automated voltage integration. The proposed method is validated experimentally by comparison with the existing equivalent circuit method (ECM) and the FEA(finite element analysis) simulation.
Phase Current Reconstruction Method of 2-Phase Induction Motor using Leg-Shunt Resistors
Kim, Dong-Ki ; Yoon, Duck-Yong ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 8, 2015, Pages 1186~1192
DOI : 10.5370/KIEE.2015.64.8.1186
This paper proposes an economical method that the phase currents can be measured and reconstructed by means of the leg-shunt resistors in the 3-leg 2-phase vector-controlled inverter for 2-phase induction motor. In general, the phase currents of 2-phase induction motor have been measured using two Hall current sensors. However, because Hall current sensors are expensive, economically disadvantageous to apply in low power applications. The proposed method is verified by computer simulations and experiments to show the good performance of the vector control.
A Study of Circulating Current in MMC based HVDC System under an Unbalanced Grid Condition
Do, Won-Seok ; Kim, Si-Hwan ; Kim, Tae-Jin ; Kim, Rae-Young ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 8, 2015, Pages 1193~1201
DOI : 10.5370/KIEE.2015.64.8.1193
This paper presents a study of circulating current of modular multi-level converter (MMC) based a high voltage direct current (HVDC) system under unbalanced grid conditions. Due to the connection of a dependent DC source in each phase, the MMC system inherently generates the power ripple of double-line-frequency components in the AC-side and as a result, the additional sinusoidal current named circulating current flows through the each arm. Reliability improvement of HVDC system under an unbalanced grid condition is one of the important criteria. Generally, the modeling of the circulating current is based on the power relation between DC-side and AC-side. However, the method is not perfectly matched in the MMC system due to the difference of the structural characteristic. In this paper, improved modeling method of circulating current is proposed, which is based on the inner arm power. The proposed method is verified by several simulations to have good agreement of the circulating current components.
Analysis for the Inrush Current and Voltage Drop of Induction Generator by the Reactor Tap Change
Kim, Jong-Gyeum ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 8, 2015, Pages 1202~1206
DOI : 10.5370/KIEE.2015.64.8.1202
The induction generator has many advantages compared to the synchronous generator in terms of cost and maintenance. So squirrel cage induction generator has been recently supplied in small hydroelectric power station. Squirrel cage induction generator generates a high inrush current at the grid-connection. This high inrush current causes a voltage drop on the grid. In order to increase the supply of the induction generator, it is very important to find the method of reducing inrush current and voltage drop.
Development of 4Hz Medical Ruby Laser System with Double Cavities using Multi-Resonant Converter
Lee, Jae-cheol ; Zheng, Tao ; Shengxu, Piao ; Xu, Guo-Cheng ; Kim, Hee-Je ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 8, 2015, Pages 1207~1211
DOI : 10.5370/KIEE.2015.64.8.1207
Various laser systems have been widely used in almost all industrial technologies because they have high energy density, directivity and coherence. Recently the clinical application is becoming wider in medical parts such as incurable disease, diagnosis and so on. Generally, ruby laser beam has the greatest efficacy for removing tattoos, freckle and other skin problem. But current medical ruby laser system has the maximum repetition rate of 2Hz and optical output beam energy of 1J. Many medical doctors really want to have a high repetition ruby laser system because that can reduce the operation time. We investigated a new ruby laser system with high repetition rate of 4Hz using double cavities. Furthermore, we develop a new power supply system adopting zero voltage switching(ZVS) to minimize switching loss by LLC resonant converter designed as 2kW class.
The Performance Comparison of The Harmonic Generators using Nonlinear Transmission Lines
Park, Soonwoo ; Kim, Hongjoon ; Yoo, Hyoungsuk ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 8, 2015, Pages 1212~1216
DOI : 10.5370/KIEE.2015.64.8.1212
In this paper, we compared the performance of the Right Handed Nonlinear Transmission Line (RH-NLTL) and Left Handed Nonlinear Transmission Line (LH-NLTL) as a harmonic generator. For a performance comparison, we fabricated both a RH-NLTL and a LH-NLTL harmonic generator whose operational bandwidth is from 0.5 GHz to 1.5 GHz. Under the each condition for the RH-NLTL and the LH-NLTL to maximize second harmonic, the output power of the second harmonic was 9.33 dB lower than the input power for the RH-NLTL and 12.67 dB lower than the input power for the LH-NLTL. Under the each condition for the RH-NLTL and the LH-NLTL to maximize third harmonic, the output power of the third harmonic was 13.33 dB lower than the input power for the RH-NLTL and 14.83dB lower than the input power for the LH-NLTL. Also, we have observed that, generatlly, a RH-NLTL is useful in generating various multiple harmonics and a LH-NLTL is useful in generating a specific order of harmonic by adjusting a proper DC vias, input frequency and input power. These tendencies could be a good guideline to use NLTLs as a frequency multiplier.
A Study on the Torque Ripple Reduction in Brushless DC Motors using Disturbance-Observer Controller
Jang, So-Hyun ; Jo, Nam-Hoon ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 8, 2015, Pages 1217~1223
DOI : 10.5370/KIEE.2015.64.8.1217
In this paper, we study the problem of torque ripple minimization in Brushless DC Motors (BLDC) and proposes a disturbance observer (DOB) based controller in order to efficiently reduce the torque ripple. In the DOB based control system, an equivalent disturbance (plant disturbance and effect of modelling error) is cancelled by its estimate. When the DOB controller is applied to BLDC motors, the effect of inverter switching is considered as an equivalent disturbance and to be cancelled by the DOB controller. Through computer simulations, it is shown that the performance of the proposed DOB controller is superior to that of the conventional PI controller. In the case where the numerical values of resistance and inductance are not known exactly, it is shown that the proposed DOB controller achieves better performance than the PI controller.
Intelligent PID Controller and its application to Structural Vibration Mitigation with MR Damper
Choe, Wook-Wook ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 8, 2015, Pages 1224~1230
DOI : 10.5370/KIEE.2015.64.8.1224
This paper is concerned with applicability of intelligent PID controller which is proposed by Fliss and Join recently. First, we analyze the stability regions of intelligent PID control systems when parameter α is varying, and propose a new method to determine the suitable range of α by using the roots locus. Second, the simulation study of magneto-rheological (MR) damper to the structural vibrations due to earthquakes is presented to verify the effectiveness of the intelligent PID control method.
A Study on the Optimal Solution for the Manipulation of a Robot with Four Limbs
Lee, Ji Young ; Sung, Young Whee ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 8, 2015, Pages 1231~1239
DOI : 10.5370/KIEE.2015.64.8.1231
We developed a robot that has four limbs, each of which has the same kinematic structure and has 6 degrees of freedom. The robot is 600mm high and weighs 4.3kg. The robot can perform walking and manipulating task by using the four limbs selectively. The robot has three walking patterns. The first one is biped walking, which uses two rear limbs as legs and two front limbs as arms. The second one is biped walking with supporting arms, which is basically biped walking but uses two arms as supporting legs for increasing stability of the robot. The last one is quadruped walking, which uses all the four limbs as legs. When a task for the robot is given, the robot approaches the task point by selecting an appropriate walking pattern among three walking patterns and performs the task. The robot has many degrees of freedom and is a redundant system for a three dimensional task. We propose a redundancy resolution method, in which the robot’s translational move to the task point is modeled as a prismatic joint and optimal solutions are obtained by optimizing some performance criteria. Several simulations are performed for the validity of the proposed method.
Evaluation of the Ambient Temperature Effect for the Autonomic Nervous Activity of the Young Adult through the Frequency Analysis of the Heart Rate Variability
Shin, Hangsik ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 8, 2015, Pages 1240~1245
DOI : 10.5370/KIEE.2015.64.8.1240
The purpose of this paper is to investigate the autonomic nervous system activity in various ambient temperatures. To evaluate autonomic function, we use the frequency domain analysis of heart rate variability such as FFT(fast fourier transformation), AR(Auto-Regressive) model and Lomb-Scargle peridogram. HRV(heart rate variability) is calculated by using ECG recorded from 3 different temperature room which temperature is controlled in 18℃(low), 25℃(mid) and 38℃(high), respectively. Totally 22 subjects were participated in the experiment. In the results, the most significant autonomic changes caused by temperature load were found in the HF(high frequency) component of FFT and AR model. And the HF power is decreased by increasing temperature. Significance level was increased by increasing the difference of temperatures.
Evaluation of the Ambient Temperature Effect for the Autonomic Nervous Activity through the Time Domain Analysis of the Heart Rate Variability
Min, Se Dong ; Shin, Hangsik ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 8, 2015, Pages 1246~1250
DOI : 10.5370/KIEE.2015.64.8.1246
The purpose of this paper is to investigate the autonomic nervous system activity in various ambient temperature situation. To evaluate autonomic function, we use the time domain analysis of heart rate variability. Electrocardiogram was recorded to derive heart rate variability in 3 different temperature room which temperature is controlled in 18℃(low), 25℃ (mid) and 38℃(high), respectively. Totally 22 subjects were participated in the experiment. The result shows that the time-domain variables such as AVNN, SDNN, SDSD, RMSSD, NN50, pNN50, NN20 and pNN20 show the significant difference between low and high temperature (p<0.01). However, these variables has no significance (p>0.05) between mid and high except on AVNN, RMSSD and pNN20. AVNN, RMSSD shows the highest significance (p<0.001) according to the various temperature environment.
A Study on Improvement of the Accuracy of SV Measurement obtained by Hand to Hand Impedance.
Yoon, Chan-Sol ; Yeom, Ho-Jun ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 8, 2015, Pages 1251~1255
DOI : 10.5370/KIEE.2015.64.8.1251
The purpose of this study is to measurement the cardiac output using hand to hand impedance method to provide convenience to user when measuring SV(stroke volume) with the use of ICG(Impedance Cardiography). We suggest the optimized modified formula, which can be applied when using impedance with the use of hand to hand Impedance. To verify this formula, a SV from transthoracic approach and hand to hand approach are compared for the 36 subjects, respectively. The acquired data was analyzed by using LabVIEW 8.6, analysis was implemented by SPSS 12.0. Fine difference was shown by individual. We showed that as a result of analyzing the ICG measurement value on thoracic and hand to hand, the correlation with SV was r=0.716, thereby having indicated the results of regression model in relatively high correlation.
Implementation Technique of Real-time Monitoring System for High-Speed Rail Contact Wire with High Tension
Cho, Yong Hyeon ; Park, Young ; Jung, Hyun Jin ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 8, 2015, Pages 1256~1261
DOI : 10.5370/KIEE.2015.64.8.1256
Along with the increase of railway catenary system operation speed to 400 km/h, there have been growing demands for good quality current collection systems that satisfy quality standards as well as criteria for safe working. Retaining uniform elasticity tension of contact wires is essential in maintaining high quality contact between pantograph and OCL (Overhead Contact Line) of current collection systems in high speed railways. Therefore, the tension of contact wire must be kept within tight tolerance limits in both working conditions and adverse weather conditions of catenary system. In accordance with these conditions, this paper presents a real time monitoring system for the tensioning device of the newly installed catenary system on the special route of Honam high speed line for 400 km/h operation. For the verification of the true value of tension of contact wires, we have developed ring-type tensioning sensors which were installed on supporting points of mast which compose the catenary system. According to the field test performed on the Honam high speed line catenary system, variation of tension was measured accurately in real-time.
A modelling on Shunt Reactors in Railway Power Transmission System
Lee, Jongsoo ; Lee, Jongwoo ;
The Transactions of The Korean Institute of Electrical Engineers, volume 64, issue 8, 2015, Pages 1262~1268
DOI : 10.5370/KIEE.2015.64.8.1262
I In power transmission systems, voltage changes continuously as reactive power is whether over supply or shortage. Reactive power produces in generators and consumes in transmission lines, and loads. Voltages at end points of transmission lines rise which is called Ferranti effect. Excessive voltage rising can reduce transmission equipment life, the voltage rising is usually permitted within the limit of 10%~30% excess. Shunt reactors are installed in transmission lines to put a curb on voltage rising. In this paper, we tried to do modelling for shunt reactor configuration types which are no grounding, grounded and grouded neutral reactor. Simulation are carried out for reactor magnitude for compensating transmission line capacitance.