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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 6, Issue 6 - Nov 2011
Volume 6, Issue 5 - Sep 2011
Volume 6, Issue 4 - Jul 2011
Volume 6, Issue 3 - May 2011
Volume 6, Issue 2 - Mar 2011
Volume 6, Issue 1 - Jan 2011
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A Robust Fault Location Algorithm for Single Line-to-ground Fault in Double-circuit Transmission Systems
Zhang, Wen-Hao ; Rosadi, Umar ; Choi, Myeon-Song ; Lee, Seung-Jae ; Lim, Il-Hyung ;
Journal of Electrical Engineering and Technology, volume 6, issue 1, 2011, Pages 1~7
DOI : 10.5370/JEET.2011.6.1.001
This paper proposes an enhanced noise robust algorithm for fault location on double-circuit transmission line for the case of single line-to-ground (SLG) fault, which uses distributed parameter line model that also considers the mutual coupling effect. The proposed algorithm requires the voltages and currents from single-terminal data only and does not require adjacent circuit current data. The fault distance can be simply determined by solving a second-order polynomial equation, which is achieved directly through the analysis of the circuit. The algorithm, which employs the faulted phase network and zero-sequence network with source impedance involved, effectively eliminates the effect of load flow and fault resistance on the accuracy of fault location. The proposed algorithm is tested using MATLAB/Simulink under different fault locations and shows high accuracy. The uncertainty of source impedance and the measurement errors are also included in the simulation and shows that the algorithm has high robustness.
A Study on Reliability Differentiated Pricing of Long-Term Transactions
Kim, Bal-Ho H. ;
Journal of Electrical Engineering and Technology, volume 6, issue 1, 2011, Pages 8~13
DOI : 10.5370/JEET.2011.6.1.008
Reliability differentiated pricing (RDP) is known to improve the efficiency and benefits of consumers and producers. Outage costs representing the economic and non-economic consequences of service curtailments to customers can be used as an effective parameter of RDP in electricity markets. This paper examines the theoretical aspects of an RDP scheme, and derives the optimal decisions of consumers and electric utilities for long-term transactions. The proposed RDP is demonstrated through a case study on a wheeling service.
Available Transfer Capability Enhancement with FACTS Devices in the Deregulated Electricity Market
Manikandan, B.V. ; Raja, S. Charles ; Venkatesh, P. ;
Journal of Electrical Engineering and Technology, volume 6, issue 1, 2011, Pages 14~24
DOI : 10.5370/JEET.2011.6.1.014
In order to facilitate the electricity market operation and trade in the restructured environment, ample transmission capability should be provided to satisfy the demand of increasing power transactions. The conflict of this requirement and the restrictions on the transmission expansion in the restructured electricity market has motivated the development of methodologies to enhance the available transfer capability (ATC) of existing transmission grids. The insertion of flexible AC transmission System (FACTS) devices in electrical systems seems to be a promising strategy to enhance single area ATC and multi-area ATC. In this paper, the viability and technical merits of boosting single area ATC and multi-area ATC using Thyristor controlled series compensator (TCSC), static VAR compensator (SVC) and unified power flow controller (UPFC) in single device and multi-type three similar and different device combinations are analyzed. Particle swarm optimization (PSO) algorithm is employed to obtain the optimal settings of FACTS devices. The installation cost is also calculated. The study has been carried out on IEEE 30 bus and IEEE 118 bus systems for the selected bilateral, multilateral and area wise transactions.
Generalized Reliability Centered Maintenance Modeling Through Modified Semi-Markov Chain in Power System
Park, Geun-Pyo ; Heo, Jae-Haeng ; Lee, Sang-Seung ; Yoon, Yong-Tae ;
Journal of Electrical Engineering and Technology, volume 6, issue 1, 2011, Pages 25~31
DOI : 10.5370/JEET.2011.6.1.025
The purpose of power system maintenance is to prevent equipment failure. The maintenance strategy should be designed to balance costs and benefits because frequent maintenance increases cost while infrequent maintenance can also be costly due to electricity outages. This paper proposes maintenance modeling of a power distribution system using reliability centered maintenance (RCM). The proposed method includes comprehensive equipment modeling and impact analysis to evaluate the effect of equipment faults. The problem of finding the optimum maintenance strategy is formulated in terms of dynamic programming. The applied power system is based on the RBTS Bus 2 model, and the results demonstrate the potential for designing a maintenance strategy using the proposed model.
Fuzzy PSO Congestion Management using Sensitivity-Based Optimal Active Power Rescheduling of Generators
Venkaiah, Ch ; Vinod Kumar, D M ;
Journal of Electrical Engineering and Technology, volume 6, issue 1, 2011, Pages 32~41
DOI : 10.5370/JEET.2011.6.1.032
This paper presents a new method of Fuzzy Particle Swarm Optimization (FPSO)-based Congestion Management (CM) by optimal rescheduling of active powers of generators. In the proposed method, generators are selected based on their sensitivity to the congested line for efficient utilization. The task of optimally rescheduling the active powers of the participating generators to reduce congestion in the transmission line is attempted by FPSO, Fitness Distance Ratio PSO (FDR-PSO), and conventional PSO. The FPSO and FDR-PSO algorithms are tested on the IEEE 30-bus and Practical Indian 75-bus systems, after which the results are compared with conventional PSO to determine the effectiveness of CM. Compared with FDR-PSO and PSO, FPSO can better perform the optimal rescheduling of generators to relieve congestion in the transmission line.
Introduction of Generator Unit Controller and Its Tuning for Automatic Generation Control in Korean Energy Management System (K-EMS)
Park, Min-Su ; Chun, Yeong-Han ;
Journal of Electrical Engineering and Technology, volume 6, issue 1, 2011, Pages 42~47
DOI : 10.5370/JEET.2011.6.1.042
Automatic generation control (AGC) is an important function for load frequency control, which is being implemented in Energy Management System (EMS). A key feature of AGC is to back up governors to enhance the performance of frequency control. The governor regulates system frequency in several to ten seconds, while the droop control concept results in steady-state control error. AGC is a supplementary tool for compensation of the steady-state error caused by the droop setting of the governors. As the AGC target is delivered to each generator as an open loop control target, the generator output is not guaranteed to follow the AGC target. In this paper, we introduce generating unit controller (GUC) control block, which has the purpose of enabling the generator output to track the AGC target while maintaining the governor performance. We also address the tuning methods of GUC for better performance of AGC in the Korea Energy Management System (K-EMS).
Determination of Regulator Parameters and Transient Analysis of Modified Self-commutating CSI-fed IM Drive
Pandey, A.K. ; Tripathi, S.M. ;
Journal of Electrical Engineering and Technology, volume 6, issue 1, 2011, Pages 48~58
DOI : 10.5370/JEET.2011.6.1.048
In this paper, an attempt has been made to design the current and speed proportional and integral (PI) regulators of self-commutating current source inverter-fed induction motor drive having capacitors at the machine end and to investigate the transient performance of the same for step changes in reference speed. The mathematical model of the complete drive system is developed in closed loop, and the characteristic equations of the systems are derived using perturbation about steady-state operating point in order to develop the characteristic equations. The D-partition technique is used for finding the stable region in the parametric plane. Frequency scanning technique is used to confirm the stability region. Final selection of the regulator parameters is done by comparing the transient response of the current and speed loops for step variations in reference. The performance of the drive is observed analytically through MATLAB simulation.
Backstepping Control for Multi-Machine Web Winding System
Bouchiba, Bousmaha ; Hazzab, Abdeldjebar ; Glaoui, Hachemi ; Med-Karim, Fellah ; Bousserhane, Ismail Khalil ; Sicard, Pierre ;
Journal of Electrical Engineering and Technology, volume 6, issue 1, 2011, Pages 59~66
DOI : 10.5370/JEET.2011.6.1.059
This work treat the modeling and simulation of non-linear dynamic behavior of a web winding process during traction. We designate by a winding process any system applying the cycles of unwinding, transport, treatment, and winding to various flat products. This system knows several constraints, such as the thermal effects caused by the frictions, and the mechanical effects provoked by metal elongation, that generates dysfunctions due to the influence of the process conditions. Several controllers are considered, including Proportional-integral (PI) and Backstepping control. This paper presents the study of Backstepping controls strategy of the winding system. Our winding system is simulated in MATLAB SIMULINK environment, the results obtained illustrate the efficiency of the proposed control with no overshoot, and the rising time is improved with good disturbances rejections comparing with the classical control law.
Application of a Robust Fuzzy Sliding Mode Controller Synthesis on a Buck-Boost DC-DC Converter Power Supply for an Electric Vehicle Propulsion System
Allaoua, Boumediene ; Laoufi, Abdellah ;
Journal of Electrical Engineering and Technology, volume 6, issue 1, 2011, Pages 67~75
DOI : 10.5370/JEET.2011.6.1.067
The development of electric vehicle power electronics system control, composed of DC-AC inverters and DC-DC converters, attract much research interest in the modern industry. A DC-AC inverter supplies the high-power motor torques of the propulsion system and utility loads of electric vehicles, whereas a DC-DC converter supplies the conventional low-power and low-voltage loads. However, the need for high-power bidirectional DC-DC converters in future electric vehicles has led to the development of many new topologies of DC-DC converters. The nonlinear control of power converters is an active research area in the field of power electronics. This paper focuses on the use of the fuzzy sliding mode strategy as a control strategy for buck-boost DC-DC converter power supplies in electric vehicles. The proposed fuzzy controller specifies changes in control signals based on the surface and knowledge on surface changes to satisfy the sliding mode stability and attraction conditions. The performance of the proposed fuzzy sliding controller is compared to that of the classical sliding mode controller. The satisfactory simulation results show the efficiency of the proposed control law, which reduces the chattering phenomenon. Moreover, the obtained results prove the robustness of the proposed control law against variations in load resistance and input voltage in the studied converter.
A Magnetostrictive Force and Vibration Mode Analysis of 3 kW BLDC Motor by a Magneto-Mechanical Coupling Formulation
Shin, Pan-Seok ; Cheung, Hee-Jun ;
Journal of Electrical Engineering and Technology, volume 6, issue 1, 2011, Pages 76~80
DOI : 10.5370/JEET.2011.6.1.076
This paper proposes a method to calculate magnetostrictive forces, displacement, and vibration modes of a large-scale Brushless DC(BLDC) motor by using a magneto-mechanically strong coupling formulation. The force is calculated using the energy method with magnetostrictive stress tensor. The mechanical vibration modes are also analyzed by using the principle of Hamilton and the calculated magneto-elastic forces acting on the surfaces of the stator. To verify the algorithm, 3 MW BLDC motor is simulated, and the forces, displacements, and vibration modes are calculated. The result shows that the mechanically stressed core has more deformation or displacements than those of the normal condition.
Thrust Performance Improvement of a Linear Induction Motor
Lee, Hyung-Woo ; Park, Chan-Bae ; Lee, Byung-Song ;
Journal of Electrical Engineering and Technology, volume 6, issue 1, 2011, Pages 81~85
DOI : 10.5370/JEET.2011.6.1.081
The end effect of a linear induction motor (LIM) has been known for several decades, especially in high speed operation. The exit part of the primary is not dealt as extensively as the entry part because of its minor effect. However, the exit part is one of the keys to weaken the dolphin effect, which occurs in high speed operation. In this paper, the concept of the virtual primary core is introduced, and chamfering of the primary outlet teeth is proposed to minimize the longitudinal end effect at the exit zone. For this, LIM for the high-speed train is designed and analyzed by using finite element method. Results confirm that chamfering can improve thrust performance effectively.
AC-PDP Sustain Driver using Bidirectional Switches
Kang, Feel-Soon ;
Journal of Electrical Engineering and Technology, volume 6, issue 1, 2011, Pages 86~93
DOI : 10.5370/JEET.2011.6.1.086
To minimize the cost and power consumption of PDP TV, a practical sustain circuit topology is presented with an address-and-display-period-separated driving scheme. The proposed sustain driver employs bidirectional switches to reduce the number of components. Operational principles and corresponding features are illustrated and compared with the conventional approach. The valuable contributions of the proposed high-performing sustainer has been proven by computer-aided simulations and experiments by using a prototype equipped with 7.5-inch diagonal panel operated at 200 kHz switching frequency.
Design and Analysis of Hybrid Stator Bearingless SRM
Lee, Dong-Hee ; Ahn, Jin-Woo ;
Journal of Electrical Engineering and Technology, volume 6, issue 1, 2011, Pages 94~103
DOI : 10.5370/JEET.2011.6.1.094
This paper presents a novel bearingless switched reluctance motor (BLSRM) with decoupled torque and suspending stator poles. BLSRM is different from conventional bearingless switched reluctance motors (SRMs) because its suspending poles are separated from the torque poles. Perpendicularly placed suspending poles are designed to produce a continuous radial force to suspend the rotor. Due to the independent suspending and torque poles, BLSRM produces a suspending force with excellent linearity according to the rotor position and independent characteristics of the torque current. The air-gap is easier to control than in conventional SRMs with their linear and independent characteristics. Furthermore, to verify the proposed structure, a mathematical model for the suspending force is derived. Finite element analysis is also employed to compare BLSRM and conventional SRMs expressions of suspending force. A prototype motoris designed and manufactured to verify the effectiveness of the proposed bearingless structure.
Sliding Mode Current Controller Design for Power LEDs
Kim, Eung-Seok ; Kim, Cherl-Jin ;
Journal of Electrical Engineering and Technology, volume 6, issue 1, 2011, Pages 104~110
DOI : 10.5370/JEET.2011.6.1.104
High-brightness LED control is required for stable operation, thus the driver and control system must be designed to deliver a constant current to optimize reliability and ensure consistent luminous flux. In this paper, the sliding mode current controller is designed to adjust the illumination density of power LEDs. The controller design model of power LEDs, including its driving circuit, is proposed to realize the dimming control of power LEDs. A buck converter is introduced to drive the power LEDs and reduce the input voltage to a lower level. The sliding mode software controller is implemented to adjust the dimming of power LEDs. The proposed strategy for driving power LEDs is investigated and comparatively studied by experiments.
Implementation of an Inductively Coupled EM Probe System for PD Diagnosis
Kim, Hee-Dong ; Park, Noh-Joon ; Park, Dae-Hee ;
Journal of Electrical Engineering and Technology, volume 6, issue 1, 2011, Pages 111~118
DOI : 10.5370/JEET.2011.6.1.111
In recent years, various types of partial discharge (PD) methods such as capacitive, inductive, electromagnetic, and acoustic coupling techniques have been developed for diagnosing rotating machines. An electromagnetic (EM) probe, which is an inductively coupled type of sensor, is required for detecting corona and internal discharges during off-line tests. In this study, a new technique for enhancing the measurement sensitivities for corona and internal discharge based on an EM inductive position sensor is proposed. An EM probe that winds wires around horseshoe-shaped and cylindershaped ferrites as helices is designed and optimized for the implementation of off-line PD monitoring of the stator winding of a rotating machine. The measurement system based on this design is implemented, and it is verified from the results of the experiment performed in this study that the probe provides similar performance as existing commercial products.
A High-Speed Single Crystal Silicon AFM Probe Integrated with PZT Actuator for High-Speed Imaging Applications
Cho, Il-Joo ; Yun, Kwang-Seok ; Nam, Hyo-Jin ;
Journal of Electrical Engineering and Technology, volume 6, issue 1, 2011, Pages 119~122
DOI : 10.5370/JEET.2011.6.1.119
A new high speed AFM probe has been proposed and fabricated. The probe is integrated with PZT actuated cantilever realized in bulk silicon wafer using heavily boron doped silicon as an etch stop layer. The cantilever thickness can be accurately controlled by the boron diffusion process. Thick SCS cantilever and integrated PZT actuator make it possible to be operated at high speed for fast imaging. The resonant frequency of the fabricated probe is 92.9 kHz and the maximum deflection is 5.3
at 3 V. The fabricated probe successfully measured the surface of standard sample in an AFM system at the scan speed of 600
Analysis of Arc Tube Properties by Degradation in Ceramic Metal Halide Lamp
Yang, Jong-Kyung ; Jang, Hyeok-Jin ; Park, Dae-Hee ;
Journal of Electrical Engineering and Technology, volume 6, issue 1, 2011, Pages 123~127
DOI : 10.5370/JEET.2011.6.1.123
To clarify the relations of optical properties to the main factors responsible for the loss and damage of luminous efficacy, a 20 min turn-on/turn-off test for 2,000 h for a ceramic metal halide lamp is conducted. The corrosion rates of the arc tube wall and electrode are estimated based on thermal stress. Wall blackening is attributed to the tungsten being transported from the hot electrode tips to the relatively cold arc tube wall. Furthermore, the grain boundaries of the arc tube are changed by the degradation. Distortion of the electrode is observed, and the ignition and the driving voltage of the load both increase. Finally, the color rendering index and the color coordinates are changed after the degradation. The luminous flux and the intensity of the luminous distribution are decreased significantly.
Generation of Non-uniform Meshes for Finite-Difference Time-Domain Simulations
Kim, Hyeong-Seok ; Ihm, In-Sung ; Choi, Kyung ;
Journal of Electrical Engineering and Technology, volume 6, issue 1, 2011, Pages 128~132
DOI : 10.5370/JEET.2011.6.1.128
In this paper, two automatic mesh generation algorithms are presented. The methods seek to optimize mesh density with regard to geometries exhibiting both fine and coarse physical structures. When generating meshes, the algorithms attempt to satisfy the conditions on the maximum mesh spacing and the maximum grading ratio simultaneously. Both algorithms successfully produce non-uniform meshes that satisfy the requirements for finite-difference time-domain simulations of microwave components. Additionally, an algorithm successfully generates a minimum number of grid points while maintaining the simulation accuracy.
Self-Tuning Fuzzy Logic Controller for a Dual Star Induction Machine
Merabet, Elkheir ; Amimeur, Hocine ; Hamoudi, Farid ; Abdessemed, Rachid ;
Journal of Electrical Engineering and Technology, volume 6, issue 1, 2011, Pages 133~138
DOI : 10.5370/JEET.2011.6.1.133
This paper proposes a simple but robust self-tuning fuzzy logic controller for the speed regulation of a dual star induction machine based on indirect field oriented control. For feed the two star of this machine, two voltage source inverters based on sinus-triangular pulse-width modulation techniques are introduced. The simulation results show the robustness and good performance of the proposed controller.
A New Modified CNP for Autonomous Microgrid Operation Based on Multiagent System
Kim, Hak-Man ; Wei, Wenpeng ; Kinoshita, Tetsuo ;
Journal of Electrical Engineering and Technology, volume 6, issue 1, 2011, Pages 139~146
DOI : 10.5370/JEET.2011.6.1.139
This paper presents a new modified Contract Net Protocol (CNP) for microgrid operation based on multiagent system. The CNP is a widely used protocol for interactions among distributed problem solving. The Contract Net Interaction Protocol of the Foundation for Intelligent Physical Agents (FIPA-CNIP) is a minor modification of the original CNP for multiagent system applications. In this paper, a modified CNP (MCNP) based on the FIPA-CNIP is proposed for more specialized interactions among agents for microgrid operation. A multiagent system is designed and constructed for microgrid operation. A microgrid operation based on the multiagent system is tested to check the functionality of the proposed MCNP.