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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Electrical Engineering and Technology
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The Korean Institute of Electrical Engineers
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Volume & Issues
Volume 8, Issue 6 - Nov 2013
Volume 8, Issue 5 - Sep 2013
Volume 8, Issue 4 - Jul 2013
Volume 8, Issue 3 - May 2013
Volume 8, Issue 2 - Mar 2013
Volume 8, Issue 1 - Jan 2013
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Hybrid Artificial Immune System Approach for Profit Based Unit Commitment Problem
Lakshmi, K. ; Vasantharathna, S. ;
Journal of Electrical Engineering and Technology, volume 8, issue 5, 2013, Pages 959~968
DOI : 10.5370/JEET.2013.8.5.959
This paper presents a new approach with artificial immune system algorithm to solve the profit based unit commitment problem. The objective of this work is to find the optimal generation scheduling and to maximize the profit of generation companies (Gencos) when subjected to various constraints such as power balance, spinning reserve, minimum up/down time and ramp rate limits. The proposed hybrid method is developed through adaptive search which is inspired from artificial immune system and genetic algorithm to carry out profit maximization of generation companies. The effectiveness of the proposed approach has been tested for different Gencos consists of 3, 10 and 36 generating units and the results are compared with the existing methods.
Automatic Protection Schemes for Distribution System with Open and Closed-loop
Guan, Kang-Le ; Lee, Seung-Jae ; Choi, Myeon-Song ;
Journal of Electrical Engineering and Technology, volume 8, issue 5, 2013, Pages 969~974
DOI : 10.5370/JEET.2013.8.5.969
Protection issues in distribution systems which are to be operated in open and closed-loop modes in a smart grid are studied and a generalized protection setting method is proposed to meet the new requirements. The developed setting method assumes a conventional over-current protection scheme for the system with reclosers and over-current relays. In a closed-loop mode, it identifies protective devices that have to be sacrificed in order to maximize protection coordination for bidirectional fault current flow. The proposed setting method has been tested on many systems with different complexity and is proved effective.
Modeling of a Building System and its Parameter Identification
Park, Herie ; Martaj, Nadia ; Ruellan, Marie ; Bennacer, Rachid ; Monmasson, Eric ;
Journal of Electrical Engineering and Technology, volume 8, issue 5, 2013, Pages 975~983
DOI : 10.5370/JEET.2013.8.5.975
This study proposes a low order dynamic model of a building system in order to predict thermal behavior within a building and its energy consumption. The building system includes a thermally well-insulated room and an electric heater. It is modeled by a second order lumped RC thermal network based on the thermal-electrical analogy. In order to identify unknown parameters of the model, an experimental procedure is firstly detailed. Then, the different linear parametric models (ARMA, ARX, ARMAX, BJ, and OE models) are recalled. The parameters of the parametric models are obtained by the least square approach. The obtained parameters are interpreted to the parameters of the physically based model in accordance with their relationship. Afterwards, the obtained models are implemented in Matlab/Simulink(R) and are evaluated by the mean of the sum of absolute error (MAE) and the mean of the sum of square error (MSE) with the variable of indoor temperature of the room. Quantities of electrical energy and converted thermal energy are also compared. This study will permit a further study on Model Predictive Control adapting to the proposed model in order to reduce energy consumption of the building.
An Innovative Application Method of Monthly Load Forecasting for Smart IEDs
Choi, Myeon-Song ; Xiang, Ling ; Lee, Seung-Jae ; Kim, Tae-Wan ;
Journal of Electrical Engineering and Technology, volume 8, issue 5, 2013, Pages 984~990
DOI : 10.5370/JEET.2013.8.5.984
This paper develops a new Intelligent Electronic Device (IED), and then presents an application method of a monthly load forecasting algorithm on the smart IEDs. A Multiple Linear Regression (MLR) model implemented with Recursive Least Square (RLS) estimation is established in the algorithm. Case Study proves the accuracy and reliability of this algorithm and demonstrates the practical meanings through designed screens. The application method shows the general way to make use of IED`s smart characteristics and thereby reveals a broad prospect of smart function realization in application.
Maximization of Transmission System Loadability with Optimal FACTS Installation Strategy
Chang, Ya-Chin ; Chang, Rung-Fang ;
Journal of Electrical Engineering and Technology, volume 8, issue 5, 2013, Pages 991~1001
DOI : 10.5370/JEET.2013.8.5.991
Instead of building new substations or transmission lines, proper installation of flexible AC transmission systems (FACTS) devices can make the transmission networks accommodate more power transfers with less expansion cost. In this paper, the problem to maximize power system loadability by optimally installing two types of FACTS devices, namely static var compensator (SVC) and thyristor controlled series compensator (TCSC), is formulated as a mixed discrete-continuous nonlinear optimization problem (MDCP). To reduce the complexity of the problem, the locations suitable for SVC and TCSC installations are first investigated with tangent vector technique and real power flow performance index (PI) sensitivity factor and, with the specified locations for SVC and TCSC installations, a set of schemes is formed. For each scheme with the specific locations for SVC and TCSC installations, the MDCP is reduced to a continuous nonlinear optimization problem and the computing efficiency can be largely improved. Finally, to cope with the technical and economic concerns simultaneously, the scheme with the biggest utilization index value is recommended. The IEEE-14 bus system and a practical power system are used to validate the proposed method.
Adaptive Protection Algorithm for Overcurrent Relay in Distribution System with DG
Sung, Byung Chul ; Lee, Soo Hyoung ; Park, Jung-Wook ; Meliopoulos, A.P.S. ;
Journal of Electrical Engineering and Technology, volume 8, issue 5, 2013, Pages 1002~1011
DOI : 10.5370/JEET.2013.8.5.1002
This paper proposes the new adaptive protection algorithm for inverse-time overcurrent relays (OCRs) to ensure their proper operating time and protective coordination. The application of the proposed algorithm requires digital protection relays with microcontroller and memory. The operating parameters of digital OCRs are adjusted based on the available data whenever system conditions (system with distributed generation (DG)) vary. Moreover, it can reduce the calculation time required to determine the operating parameters for achieving its purpose. To verify its effectiveness, several case studies are performed in time-domain simulation. The results show that the proposed adaptive protection algorithm can keep the proper operating time and provide the protective coordination time interval with fast response.
Optimal Location and Sizing of Shunt Capacitors in Distribution Systems by Considering Different Load Scenarios
Dideban, Mohammadhosein ; Ghadimi, Noradin ; Ahmadi, Mohammad Bagher ; Karimi, Mohammmad ;
Journal of Electrical Engineering and Technology, volume 8, issue 5, 2013, Pages 1012~1020
DOI : 10.5370/JEET.2013.8.5.1012
In this work, Self-adaptive Differential Evolutionary (SaDE) algorithm is proposed to solve Optimal Location and Size of Capacitor (OLSC) problem in radial distribution networks. To obtain the SaDE algorithm, two improvements have been applied on control parameters of mutation and crossover operators. To expand the study, three load conditions have been considered, i.e., constant, varying and effective loads. Objective function is introduced for the load conditions. The annual cost is fitness of problem, in addition to this cost, CPU time, voltage profile, active power loss and total installed capacitor banks and their related costs have been used for comparisons. To confirm the ability of each improvements of SaDE, the improvements are studied both in separate and simultaneous conditions. To verify the effectiveness of the proposed algorithm, it is tested on IEEE 10-bus and 34-bus radial distribution networks and compared with other approaches.
Rotor Speed-based Droop of a Wind Generator in a Wind Power Plant for the Virtual Inertial Control
Lee, Jinsik ; Kim, Jinho ; Kim, Yeon-Hee ; Chun, Yeong-Han ; Lee, Sang Ho ; Seok, Jul-Ki ; Kang, Yong Cheol ;
Journal of Electrical Engineering and Technology, volume 8, issue 5, 2013, Pages 1021~1028
DOI : 10.5370/JEET.2013.8.5.1021
The frequency of a power system should be kept within limits to produce high-quality electricity. For a power system with a high penetration of wind generators (WGs), difficulties might arise in maintaining the frequency, because modern variable speed WGs operate based on the maximum power point tracking control scheme. On the other hand, the wind speed that arrives at a downstream WG is decreased after having passed one WG due to the wake effect. The rotor speed of each WG may be different from others. This paper proposes an algorithm for assigning the droop of each WG in a wind power plant (WPP) based on the rotor speed for the virtual inertial control considering the wake effect. It assumes that each WG in the WPP has two auxiliary loops for the virtual inertial control, i.e. the frequency deviation loop and the rate of change of frequency (ROCOF) loop. To release more kinetic energy, the proposed algorithm assigns the droop of each WG, which is the gain of the frequency deviation loop, depending on the rotor speed of each WG, while the gains for the ROCOF loop of all WGs are set to be equal. The performance of the algorithm is investigated for a model system with five synchronous generators and a WPP, which consists of 15 doubly-fed induction generators, by varying the wind direction as well as the wind speed. The results clearly indicate that the algorithm successfully reduces the frequency nadir as a WG with high wind speed releases more kinetic energy for the virtual inertial control. The algorithm might help maximize the contribution of the WPP to the frequency support.
Design and Evaluation of a Protection Relay for a Wind Generator Based on the Positive- and Negative-Sequence Fault Components
Zheng, Taiying ; Cha, Seung-Tae ; Kim, Yeon-Hee ; Crossley, Peter A. ; Lee, Sang Ho ; Kang, Yong Cheol ;
Journal of Electrical Engineering and Technology, volume 8, issue 5, 2013, Pages 1029~1039
DOI : 10.5370/JEET.2013.8.5.1029
To avoid undesirable disconnection of healthy wind generators (WGs) or a wind power plant, a WG protection relay should discriminate among faults, so that it can operate instantaneously for WG, connected feeder or connection bus faults, it can operate after a delay for inter-tie or grid faults, and it can avoid operating for parallel WG or adjacent feeder faults. A WG protection relay based on the positive- and negative-sequence fault components is proposed in the paper. At stage 1, the proposed relay uses the magnitude of the positive-sequence component in the fault current to distinguish faults requiring non-operation response from those requiring instantaneous or delayed operation responses. At stage 2, the fault type is first determined using the relationships between the positive- and negative-sequence fault components. Then, the relay differentiates between instantaneous operation and delayed operation based on the magnitude of the positive-sequence fault component. Various fault scenarios involving changes in position and type of fault and faulted phases are used to verify the performance of the relay. This paper concludes by implementing the relay on a hardware platform based on a digital signal processor. Results indicate that the relay can successfully distinguish the need for instantaneous, delayed, or non-operation.
Pitch Angle Control and Wind Speed Prediction Method Using Inverse Input-Output Relation of a Wind Generation System
Hyun, Seung Ho ; Wang, Jialong ;
Journal of Electrical Engineering and Technology, volume 8, issue 5, 2013, Pages 1040~1048
DOI : 10.5370/JEET.2013.8.5.1040
In this paper, a sensorless pitch angle control method for a wind generation system is suggested. One-step-ahead prediction control law is adopted to control the pitch angle of a wind turbine in order for electric output power to track target values. And it is shown that this control scheme using the inverse dynamics of the controlled system enables us to predict current wind speed without an anemometer, to a considerable precision. The inverse input-output of the controlled system is realized by use of an artificial neural network. The proposed control and wind speed prediction method is applied to a Double-Feed Induction Generation system connected to a simple power system through computer simulation to show its effectiveness. The simulation results demonstrate that the suggested method shows better control performances with less control efforts than a conventional Proportional-Integral controller.
Single Parameter Fault Identification Technique for DC Motor through Wavelet Analysis and Fuzzy Logic
Winston, D.Prince ; Saravanan, M. ;
Journal of Electrical Engineering and Technology, volume 8, issue 5, 2013, Pages 1049~1055
DOI : 10.5370/JEET.2013.8.5.1049
DC motors are widely used in industries like cement, paper manufacturing, etc., even today. Early fault identification in dc motors significantly improves its life time and reduces power consumption. Many conventional and soft computing techniques for fault identification in DC motors including a recent work using model based analysis with the help of fuzzy logic are available in literature. In this paper fuzzy logic and norm based wavelet analysis of startup transient current are proposed to identify and quantify the armature winding fault and bearing fault in DC motors, respectively. Results obtained by simulation using Matlab and Simulink are presented in this paper to validate the proposed work.
Sensorless Control Method in IPMSM Position Sensor Fault for HEV
Kim, Sung-Joo ; Lee, Yong-Kyun ; Lee, Ju-Suk ; Lee, Kwang-Woon ; Kwon, Taesuk ; Mok, Hyungsoo ;
Journal of Electrical Engineering and Technology, volume 8, issue 5, 2013, Pages 1056~1061
DOI : 10.5370/JEET.2013.8.5.1056
The widely used motors in HEV(Hybrid Electric Vehicles) are IPMSM(Interior Permanent Magnet Synchronous Motor) which has no rotor heat, higher efficiency and advantageous in volume and weight comparing with other motors. For vector control of IPMSM, position information of rotor is required but Resolver is mainly used as the detecting sensor. However, the use of position sensors will reduce the system reliability of hybrid electric vehicles. In this paper, a way to control the motor by sensorless was proposed at the event of sensor failure. We also implemented IPMSM sensorless operation by the expanded EMF(Electro Motive Force) voltage way and harmonic voltage which is applying in the low speed area. And we proposed how to change with sensorless control by detecting the position sensors failure and verified it through experiments.
A Simple Current Ripple Reduction Method for B4 Inverters
Lee, Dong-Myung ; Park, Jae-Bum ; Toliyat, Hamid A. ;
Journal of Electrical Engineering and Technology, volume 8, issue 5, 2013, Pages 1062~1069
DOI : 10.5370/JEET.2013.8.5.1062
This paper proposes a simple current compensation method to improve the control performance of B4 inverters. Four-switch inverters so called B4 inverters employ only four switches. They have a split dc-link and one phase of three-phase motors is connected to the center-tap of split dc-link capacitors in B4 inverters. The voltage ripples in the center tap of the dc-link generate unbalanced three-phase voltages causing current ripples. To solve this problem, this paper presents a simple compensation method that adjusts switching times considering dc-link voltage ripples. The validity of the proposed method is verified by simulations and experiments carried out with a 1 HP induction machine.
A Study on Peak Power Reduction using Regenerative Energy in Railway Systems through DC Subsystem Interconnection
Jung, Seungmin ; Lee, Hansang ; Kim, Kisuk ; Jung, Hosung ; Kim, Hyungchul ; Jang, Gilsoo ;
Journal of Electrical Engineering and Technology, volume 8, issue 5, 2013, Pages 1070~1077
DOI : 10.5370/JEET.2013.8.5.1070
Owing to the consistent increase in energy efficiency issues, studies for improving regenerative energy utilization have been receiving attention in the Urban DC railway systems, where currently, the utilization of regenerative energy is low due to the lack of a specific plan for using this energy. The regenerative energy in railway systems has a low efficiency problem which results in the increase of the catenary voltage and a possibility to create problems to the electrical devices connected to the system. This paper deals with the power integration of large urban railway subsystems to improve regenerative energy utilization where the railway subsystems are integrated with other railway subsystems to improve the energy efficiency. Through the case studies, to find the realistic effect of integrated operation, the Seoul Metro subsystems, namely Line 5 and Line 7, has been applied. Also, evaluation for the electricity cost saving has been performed by using KEPCO electricity cost table.
A New Family of Cascaded Transformer Six Switches Sub-Multilevel Inverter with Several Advantages
Banaei, M.R. ; Salary, E. ;
Journal of Electrical Engineering and Technology, volume 8, issue 5, 2013, Pages 1078~1085
DOI : 10.5370/JEET.2013.8.5.1078
This paper presents a novel topology for cascaded transformer sub-multilevel converter. Eachsub-multilevel converter consists of two DC voltage sources with six switches to achieve five-level voltage. The proposed topology results in reduction of DC voltage sources and switches number. Single phase low frequency transformers are used in proposed topology and voltage transformation and galvanic isolation between load and sources are given by transformers. This topology can operate as symmetric or asymmetric converter but in this paper we have focused on symmetric state. The operation and performance of the suggested multilevel converter has been verified by the simulation results of a single-phase nine-level multilevel converter using MATLAB/SIMULINK.
Analysis and Modeling of Parallel Three-Phase Boost Converters Using Three-Phase Coupled Inductor
Lim, Chang-Soon ; Lee, Kui-Jun ; Kim, Rae-Young ; Hyun, Dong-Seok ;
Journal of Electrical Engineering and Technology, volume 8, issue 5, 2013, Pages 1086~1095
DOI : 10.5370/JEET.2013.8.5.1086
The main issue of parallel three-phase boost converters is reduction of the low- and high frequency circulating currents. Most present technologies concentrate on low frequency circulating current because the circulating current controller cannot mitigate the high frequency circulating current. In this paper, analytical approach of three-phase coupled inductor applied to parallel system becomes an important objective to effectively reduce the low- and high frequency circulating currents. The characteristics of three-phase coupled inductor based on a structure and voltage equations are mathematically derived. The modified voltage equations are then applied to parallel three-phase boost converters to develop averaged models in stationary coordinates and rotating coordinates. Based on the averaged modeling approach, design of the circulating current controller is presented. Simulation and experimental results demonstrate the effectiveness of the analysis and modeling for the parallel three-phase boost converters using three-phase coupled inductor.
Field Weakening Control of a PM Electric Variable Transmission for HEV
Cheng, Yuan ; Bouscayrol, Alain ; Trigui, Rochdi ; Espanet, Christophe ; Cui, Shumei ;
Journal of Electrical Engineering and Technology, volume 8, issue 5, 2013, Pages 1096~1106
DOI : 10.5370/JEET.2013.8.5.1096
This paper presents the control of a Permanent Magnet Electric Variable Transmission (PM-EVT) for Hybrid Electric Vehicles (HEVs). Consisting of two electric machines, the EVT realizes the power split function in an electromagnetic way rather than in a mechanical way. A specific PM-EVT has been designed for Toyota Prius II. The control scheme of the entire vehicle is deduced using the Energetic Macroscopic Representation methodology. The energy management strategy yields local control references. A specific attention is paid for the field weakening for wide speed range. Simulation results are provided to illustrate the EVT modeling and control.
New PWM Technique for Two-Phase Brushless DC Motor Drives
Lin, Hai ; Kwon, Byung-Il ;
Journal of Electrical Engineering and Technology, volume 8, issue 5, 2013, Pages 1107~1115
DOI : 10.5370/JEET.2013.8.5.1107
A new PWM technique for a two-phase BLDC motor fed by a two-phase eight-switch inverter is proposed in this paper. It is well known that a two-phase eight-switch inverter can significantly improve power output compared with a two-phase six-switch inverter in a two-phase motor drive. To drive the two-phase BLDC motor simply and effectively, two normal PWM strategies are investigated to manage speed regulation. However, under the conditions of low speed and light load, especially during the braking process, the current in a short time of one period is near zero, which is a discontinuous waveform every half period. To solve it, a novel PWM technique is investigated to improve the operational performance of normal technique. Using the new PWM scheme, the current continues every half period and the braking performance is improved. The effectiveness of the proposed PWM method is verified through the experiments.
Detection of Mechanical Imbalances of Induction Motors with Instantaneous Power Signature Analysis
Kucuker, Ahmet ; Bayrak, Mehmet ;
Journal of Electrical Engineering and Technology, volume 8, issue 5, 2013, Pages 1116~1121
DOI : 10.5370/JEET.2013.8.5.1116
Mechanical imbalances are common mechanical faults in induction motors. Vibration monitoring techniques have been widely used for the diagnosis of mechanical faults in induction motors, but electrical detection methods have been preferred in recent years. For many years, researchers have concentrated on the Motor Current Signature Analysis (MCSA). This paper examines the effect of mechanical imbalances to induction machine electrical parameters. Instantaneous Power Signature Analysis (IPSA) technique used to detect these faults. In the paper, a full analysis of the proposed technique is presented, and experimental results for healthy and faulty motors have been shown and discussed.
Controller Design for a Quick Charger System Suitable for Electric Vehicles
Jeong, Hae-Gwang ; Lee, Kyo-Beum ;
Journal of Electrical Engineering and Technology, volume 8, issue 5, 2013, Pages 1122~1130
DOI : 10.5370/JEET.2013.8.5.1122
This paper proposes a new design for quick battery charger systems for electric vehicles that consists of a three-phase inverter and a full-bridge converter which use the phase-shift method. The 3-phase inverter controls the input and DC-link voltage by use of a current controller and a voltage controller. The full-bridge converter transfers the DC-link voltage to a fixed output voltage. Designs for the output-side converter and controller for improved performance are proposed in this paper. Design schemes for the filter and controller of an input-side inverter are also presented. Furthermore, the paper proposes a compensation method for the offset current that is caused by switch failure and circuit problems. Simulations and experiments have been performed on a 50kW-battery charger system that is suitable for vehicles. The presented results verify the validity of the proposed method and the superiority of the system over conventional methods.
Optimal Design of a Two-phase BLDC Motor Considering Efficiency and Torque Ripple
Kim, Jae-Beom ; You, Yong-Min ; Kang, Sun-Il ; Kwon, Byung-Il ;
Journal of Electrical Engineering and Technology, volume 8, issue 5, 2013, Pages 1131~1137
DOI : 10.5370/JEET.2013.8.5.1131
This paper introduces novel a two-phase permanent magnet BLDC (PMBLDC) motor with both an asymmetric tooth and an auxiliary tooth in order to improve the dead point, efficiency and torque ripple. To calculate the merits of introducing each of the asymmetric tooth and the auxiliary tooth, characteristic analysis is performed respectively using finite element method (FEM). To maximize performance, we propose a novel model which combines the asymmetric tooth and the auxiliary tooth. To maximize the efficiency of the novel model, an optimal design is processed using the Kriging method and a genetic algorithm. Finally, an experiment is used to confirm the initial and optimal design results.
High Performance Current Controller for Sparse Matrix Converter Based on Model Predictive Control
Lee, Eunsil ; Lee, Kyo-Beum ; Lee, Young Il ; Song, Joong-Ho ;
Journal of Electrical Engineering and Technology, volume 8, issue 5, 2013, Pages 1138~1145
DOI : 10.5370/JEET.2013.8.5.1138
A novel predictive current control strategy for a sparse matrix converter is presented. The sparse matrix converter is functionally-equivalent to the direct matrix converter but has a reduced number of switches. The predictive current control uses a model of the system to predict the future value of the load current and generates the reference voltage vector that minimizes a given cost function so that space vector modulation is achieved. The results show that the proposed controller for sparse matrix converters controls the load current very effectively and performs very well through simulation and experimental results.
Design Considerations and Validation of Permanent Magnet Vernier Machine with Consequent Pole Rotor for Low Speed Servo Applications
Chung, Shi-Uk ; Chun, Yon-Do ; Woo, Byung-Chul ; Hong, Do-Kwan ; Lee, Ji-Young ;
Journal of Electrical Engineering and Technology, volume 8, issue 5, 2013, Pages 1146~1151
DOI : 10.5370/JEET.2013.8.5.1146
This paper deals with design consideration and validation of a new pole-slot combination for permanent magnet vernier machine (PMVM) with consequent pole (CP) rotor especially for extremely low speed servo applications. A 136pole-24slot PMVM with CP rotor is introduced and analyzed by 2D and 3D finite element analysis (FEA) and discussion on experimental validation is also included.
Compact UHF 9th-Order Bandpass Filter with Sharp Skirt by Cascaded-Triplet CRLH-ZOR
Kahng, Sungtek ; Lee, Boram ; Park, Taejoon ;
Journal of Electrical Engineering and Technology, volume 8, issue 5, 2013, Pages 1152~1156
DOI : 10.5370/JEET.2013.8.5.1152
We propose a compact high-order(9th) UHF bandpass filter comprising the composite right-handed and left-handed(CRLH) zeroth-order resonators(ZORs) in the form of the three cascaded-triplets(CTs) newly applied to the ZOR filter which results in very steep skirt. The method is verified by circuit and EM simulations and measurement with metamaterial properties.
High-Voltage AlGaN/GaN High-Electron-Mobility Transistors Using Thermal Oxidation for NiO
Kim, Minki ; Seok, Ogyun ; Han, Min-Koo ; Ha, Min-Woo ;
Journal of Electrical Engineering and Technology, volume 8, issue 5, 2013, Pages 1157~1162
DOI : 10.5370/JEET.2013.8.5.1157
We proposed AlGaN/GaN high-electron-mobility transistors (HEMTs) using thermal oxidation for NiOx passivation. Auger electron spectroscopy, secondary ion mass spectroscopy, and pulsed I-V were used to study oxidation features. The oxidation process diffused Ni and O into the AlGaN barrier and formed NiOx on the surface. The breakdown voltage of the proposed device was 1520 V while that of the conventional device was 300 V. The gate leakage current of the proposed device was 3.5
and that of the conventional device was 1116.7
. The conventional device exhibited similar current in the gate-and-drain-pulsed I-V and its drain-pulsed counterpart. The gate-and-drain-pulsed current of the proposed device was about 56 % of the drain-pulsed current. This indicated that the oxidation process may form deep states having a low emission current, which then suppresses the leakage current. Our results suggest that the proposed process is suitable for achieving high breakdown voltages in the GaN-based devices.
Cylindrical Silicon Nanowire Transistor Modeling Based on Adaptive Neuro-Fuzzy Inference System (ANFIS)
Rostamimonfared, Jalal ; Talebbaigy, Abolfazl ; Esmaeili, Teamour ; Fazeli, Mehdi ; Kazemzadeh, Atena ;
Journal of Electrical Engineering and Technology, volume 8, issue 5, 2013, Pages 1163~1168
DOI : 10.5370/JEET.2013.8.5.1163
In this paper, Adaptive Neuro-Fuzzy Inference System (ANFIS) is applied for modeling and simulation of DC characteristic of cylindrical Silicon Nanowire Transistor (SNWT). Device Geometry parameters, terminal voltages, temperature and output current were selected as the main factors of modeling. The results obtained are compared with numerical method and a good match has been observed between them, which represent accuracy of model. Finally, we imported the ANFIS model as a voltage controlled current source in a circuit simulator like HSPICE and simulated a SNWT inverter and common-source amplifier by this model.
Combination of Light Emitting Diode at 375 nm and Photo-reactive TiO
Layer Prepared by Electrostatic Spraying for Sterilization
Hwang, Kyu-Seog ; Jeon, Young-Sun ; Choi, Tae-Il ; Hwangbo, Seung ;
Journal of Electrical Engineering and Technology, volume 8, issue 5, 2013, Pages 1169~1174
DOI : 10.5370/JEET.2013.8.5.1169
The objective of this work was to increase the efficiency of ultraviolet-light emitting diodes at 375 nm for sterilization. Since
had antibacterial properties, which were attributed to the appearance of hydroxyl radicals and superoxide radical anions on the surface species under ultra violet radiation at about 387 nm, photo-reactive layers such as Ag-doped
were coated on aluminum substrates by electrostatic spraying. Crystallinity and surface morphology of the coating layer were examined by X-ray diffraction
scan and field emission-scanning electron microscope, respectively. In an antibacterial test, we observed above 99% reduction of Escherichia coli populations on 3 or 5 mol% Ag-doped
layers after irradiation for 2 hrs at 375 nm, while very low inactivation on bare aluminum substrates occurred after irradiation as the same condition.
Design and Evaluation of a High Concentration, High Penetration Unipolar Corona Ionizer for Electrostatic Discharge and Aerosol Charging
Intra, Panich ; Tippayawong, Nakorn ;
Journal of Electrical Engineering and Technology, volume 8, issue 5, 2013, Pages 1175~1181
DOI : 10.5370/JEET.2013.8.5.1175
The aim of this paper is to design and evaluate a high concentration, high penetration unipolar corona ionizer. The electrostatic characteristics in terms of voltage-current relationships of the present ionizer in the discharge zones for positive and negative coronas were discussed. Using ion current measurement, the concentration and penetration of ions were evaluated at corona voltages across the needle electrodes between 1 and 4 kV, flow rates between 1 and 5 L/min, and an operating pressure of 1 atm. In the discharge zone of the ionizer, the highest ion concentrations were found to be about
for positive and negative coronas, respectively. At the outlet of the ionizer, it was found that the highest ion concentration was about
for positive and negative coronas, respectively. The highest ion penetration for positive and negative coronas through the ionizer was found to be about 98 % and 33 %, respectively. The
product for positive and negative coronas was also found to
, respectively. From the findings, this ionizer proved to be particularly useful as an aerosol charger for positive and negative charge before the detector in an electrical aerosol detector.
New Approach for Transient Radiation SPICE Model of CMOS Circuit
Jeong, Sang-Hun ; Lee, Nam-Ho ; Lee, Jong-Yeol ; Cho, Seong-Ik ;
Journal of Electrical Engineering and Technology, volume 8, issue 5, 2013, Pages 1182~1187
DOI : 10.5370/JEET.2013.8.5.1182
Transient radiation is emitted during a nuclear explosion and causes fatal errors as upset and latch-up in CMOS circuits. This paper proposes the transient radiation SPICE models of NMOS, PMOS, and INVERTER based on the transient radiation analysis using TCAD (Technology Computer Aided Design). To make the SPICE model of a CMOS circuit, the photocurrent in the PN junction of NMOS and PMOS was replaced as current source, and a latch-up phenomenon in the inverter was applied using a parasitic thyristor. As an example, the proposed transient radiation SPICE model was applied to a CMOS NAND circuit. The CMOS NAND circuit was simulated by SPICE and TCAD using the 0.18um CMOS process model parameter. The simulated results show that the SPICE results were similar to the TCAD simulation and the test results of commercial CMOS NAND IC. The simulation time was reduced by 120 times compared to the TCAD simulation.
MRI Image Retrieval Using Wavelet with Mahalanobis Distance Measurement
Rajakumar, K. ; Muttan, S. ;
Journal of Electrical Engineering and Technology, volume 8, issue 5, 2013, Pages 1188~1193
DOI : 10.5370/JEET.2013.8.5.1188
In content based image retrieval (CBIR) system, the images are represented based upon its feature such as color, texture, shape, and spatial relationship etc. In this paper, we propose a MRI Image Retrieval using wavelet transform with mahalanobis distance measurement. Wavelet transformation can also be easily extended to 2-D (image) or 3-D (volume) data by successively applying 1-D transformation on different dimensions. The proposed algorithm has tested using wavelet transform and performance analysis have done with HH and
elimination methods. The retrieval image is the relevance between a query image and any database image, the relevance similarity is ranked according to the closest similar measures computed by the mahalanobis distance measurement. An adaptive similarity synthesis approach based on a linear combination of individual feature level similarities are analyzed and presented in this paper. The feature weights are calculated by considering both the precision and recall rate of the top retrieved relevant images as predicted by our enhanced technique. Hence, to produce effective results the weights are dynamically updated for robust searching process. The experimental results show that the proposed algorithm is easily identifies target object and reduces the influence of background in the image and thus improves the performance of MRI image retrieval.
Vision-based Automatic System for Non-contact Measurement of Morphometric Characteristics of Flatfish
Jeong, Seong-Jae ; Yang, Yong-Su ; Lee, Kyounghoon ; Kang, Jun-Gu ; Lee, Dong-Gil ;
Journal of Electrical Engineering and Technology, volume 8, issue 5, 2013, Pages 1194~1201
DOI : 10.5370/JEET.2013.8.5.1194
This paper introduces a vision-based automatic system (VAMS) for non-contact measurement of morphometric characteristics of flatfish, such as total length (TL), body width (BW), height (H), and weight (W). The H and W are simply measured by a laser displacement and a load cell, respectively. The TL and BW are measured by a proposed morphological image processing algorithm. The proposed algorithm cans measurement, when the tail of flatfish is deformed, and when it is randomly oriented. In the experiment, the average and maximum measurement errors were recorded, and standard deviations and coefficients of variation (CVs) for the measurements were calculated. From those results, when flatfish the TL measurements had an average of 266.844 mm, a standard deviation of 0.351 mm, a CV of 0.131%, and a maximum error of 0.87 mm with straightened flatfish (
: 267 mm,
: 141 mm), and when flatfish of different sizes were measured, the errors in the TL and BW measurements were both about 0.2 %. Using a single conveyor, the VAMS can process up to 900 fishes per hour. Moreover, it can measure morphometric characteristics of flatfish with a TL of up to 500 mm.
High Performance of Self Scheduled Linear Parameter Varying Control with Flux Observer of Induction Motor
Khamari, Dalila ; Makouf, Abdesslam ; Drid, Said ; Chrifi-Alaoui, Larbi ;
Journal of Electrical Engineering and Technology, volume 8, issue 5, 2013, Pages 1202~1211
DOI : 10.5370/JEET.2013.8.5.1202
This paper deals with a robust controller for an induction motor (IM) which is represented as a linear parameter varying systems. To do so linear matrix inequality (LMI) based approach and robust Lyapunov feedback are associated. This approach is related to the fact that the synthesis of a linear parameter varying (LPV) feedback controller for the inner loop take into account rotor resistance and mechanical speed as varying parameter. An LPV flux observer is also synthesized to estimate rotor flux providing reference to cited above regulator. The induction motor is described as a polytopic LPV system because of speed and rotor resistance affine dependence. Their values can be estimated on line during systems operations. The simulation and experimental results largely confirm the effectiveness of the proposed control.
Power Control Method for Reducing Circulating Current in Parallel Operation of DC Distribution System
Shin, Soo-Cheol ; Lee, Hee-Jun ; Kim, Young-Ho ; Lee, Jung-Hyo ; Lee, Taeck Kie ; Won, Chung-Yuen ;
Journal of Electrical Engineering and Technology, volume 8, issue 5, 2013, Pages 1212~1220
DOI : 10.5370/JEET.2013.8.5.1212
In general, for a large power system like DC distribution system for buildings, several power converters are modularized for parallel operation. However, in parallel operation, inconsistency of parameters in each module causes circulating current in the whole system. Circulating current is directly related to loss, and, therefore, it is most important for the safety of the power system to supply the suitable current to each module. This paper proposes a control method to reduce circulating current caused during parallel operation. Accordingly, the validity of parallel operation system including response characteristics and normal state was verified by simulation and experiment result.
The Maximum Efficiency Driving in IPMSM by Precise Estimation of Current Phase Angle
Cho, Gyu-Won ; Kim, Cheol-Min ; Kim, Gyu-Tak ;
Journal of Electrical Engineering and Technology, volume 8, issue 5, 2013, Pages 1221~1226
DOI : 10.5370/JEET.2013.8.5.1221
In this paper, the equivalent circuit for the efficiency calculation by precise estimation of the linkage flux, inductance and iron loss resistance was calculated accurately. In addition, the driving characteristics according to the current phase angle are analyzed and the maximum efficiency point is calculated. And then, analyzed and experimental values of the efficiency were compared. So, causes of error were expected to be vibration and noise by harmonic distortion of the voltage and current, and mechanical loss of dynamometer. In addition, the driving characteristics according to the current phase angle are analyzed and the maximum efficiency point is calculated.
Control validation of Peugeot 3∞8 HYbrid4 Vehicle Using a Reduced-scale Power HIL Simulation
Letrouve, Tony ; Lhomme, Walter ; Bouscayrol, Alain ; Dollinger, Nicolas ;
Journal of Electrical Engineering and Technology, volume 8, issue 5, 2013, Pages 1227~1233
DOI : 10.5370/JEET.2013.8.5.1227
The new engineering challenges lead to a control of a vehicle more and more complex. To tackle this issue, Hardware-In-the-Loop (HIL) simulation is used in the development of real-time embedded systems. In this paper, the control of a double parallel hybrid vehicle is validated using a reduced power HIL simulation. A graphical description is used in order to organize the emulation and control. Some experimental results of a versatile testbed are given for the Peugeot
Power Demand and Total Harmonic Distortion Analysis for an EV Charging Station Concept Utilizing a Battery Energy Storage System
Kim, Kisuk ; Song, Chong Suk ; Byeon, Gilsung ; Jung, Hosung ; Kim, Hyungchul ; Jang, Gilsoo ;
Journal of Electrical Engineering and Technology, volume 8, issue 5, 2013, Pages 1234~1242
DOI : 10.5370/JEET.2013.8.5.1234
To verify the effectiveness of the proposed system, the charges in power demand are analyzed for an AC and DC distribution system for the existing V2G concept and electric vehicle charging stations connected to a Battery Energy Storage System. In addition, since many power-converter-based chargers are operated simultaneously in an EV charging station, the change in the system harmonics when several EV chargers are connected at a single point is analyzed through simulations.
Modeling and Analysis of PMSMs under Inter Turn Short Faults
Choi, Jun-Hyuk ; Gu, Bon-Gwan ; Won, Chung-Yuen ;
Journal of Electrical Engineering and Technology, volume 8, issue 5, 2013, Pages 1243~1250
DOI : 10.5370/JEET.2013.8.5.1243
A model of a permanent magnet synchronous motor (PMSM) with an inter turn short fault is proposed using a deformed flux model. The deformed flux model includes not only the fault winding flux information but also the inductance variation of the healthy winding considering the configuration of the winding distribution. With the deformed flux model and the positive sequence current assumption, the proposed model is derived in the positive and negative sequence synchronous reference frame (SRF). The finite elements method (FEM) simulation is applied to validate the proposed PMSM model with inter turn short fault.