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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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Journal DOI :
The Korean Institute of Electrical Engineers
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Volume & Issues
Volume 5, Issue 4 - Nov 2010
Volume 5, Issue 3 - Sep 2010
Volume 5, Issue 2 - Jun 2010
Volume 5, Issue 1 - Mar 2010
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Smart Grid and Its Implications for Electricity Market Design
Kim, Seon-Gu ; Hur, Seong-Il ; Chae, Yeoung-Jin ;
Journal of Electrical Engineering and Technology, volume 5, issue 1, 2010, Pages 1~7
DOI : 10.5370/JEET.2010.5.1.001
Recently, smart grid has been considered a very important new energy delivery technology, and one that can help ensure a cleaner environment by making use of information and communication technology (ICT) in countries around the world. The many technological benefits smart grid offers is expected to bring about a huge change in the electric energy supply chain. In particular, smart grid with advanced ICT is likely to allow market agents to participate in the decision-making process in the restructured electricity industry, easily facilitating Homeostatic Utility Control. In this paper, we examine smart grid as a market externality, and then illustrate issues from the commercial market perspective as it relates to electricity market design. Finally, our paper identifies some of the impacts of smart grid on electricity market design, which may possibly be incorporated into the evolution of the electricity market, thus ensuring market efficiency.
Flexible Maintenance Scheduling of Generation System by Multi-Probabilistic Reliability Criterion in Korea Power System
Park, Jeong-Je ; Choi, Jae-Seok ; Baek, Ung-Ki ; Cha, Jun-Min ; Lee, Kwang-Y. ;
Journal of Electrical Engineering and Technology, volume 5, issue 1, 2010, Pages 8~15
DOI : 10.5370/JEET.2010.5.1.008
A new technique using a search method which is based on fuzzy multi-criteria function is proposed for GMS(generator maintenance scheduling) in order to consider multi-objective function. Not only minimization of probabilistic production cost but also maximization of system reliability level are considered for fuzzy multi-criteria function. To obtain an optimal solution for generator maintenance scheduling under fuzzy environment, fuzzy multi-criteria relaxation method(fuzzy search method) is used. The practicality and effectiveness of the proposed approach are demonstrated by simulation studies for a real size power system model in Korea in 2010.
Study of the Design of Data Acquisition and Analysis Systems for Multi-purpose Regional Energy Systems
Lee, Han-Sang ; Yoon, Dong-Hee ; Jang, Gil-Soo ; Park, Jong-Keun ; Park, Goon-Cherl ;
Journal of Electrical Engineering and Technology, volume 5, issue 1, 2010, Pages 16~20
DOI : 10.5370/JEET.2010.5.1.016
Recently, the smart grid has become a hot issue and interest in related power sources have increased accordingly. The implementation of a smart grid can enable many generation resources to be linked to the power system, including small-scale reactors for the purpose of co-generation. Research on small-scale reactors is being carried out all over the world. Similarly, Korea is also conducting research on multi-purpose regional energy systems using nuclear energy. This paper proposes a real-time data acquisition and analysis system for small-scale reactors, and is known as the REX-10 (Regional Energy rX 10 MVA). This analysis requires real-time simulations for the power system since it needs data communication with a remote REX-10. A RTDS (Real Time Digital Simulator) has been used for the simulation, and a SCADA/HMI system interfaced with the RTDS is proposed for the purpose of monitoring and control of the regional energy system.
A Study on Optimal Planning Strategy Based on Customer Outage Costs
Kim, Bal-Ho H. ;
Journal of Electrical Engineering and Technology, volume 5, issue 1, 2010, Pages 21~27
DOI : 10.5370/JEET.2010.5.1.021
This paper examines the long-run social welfare maximization problems facing public utilities, which includes consideration of the cost of capital or other fixed costs of production, from which it derives optimal investment decisions in a reliability differentiated pricing based market. Reliability differentiated pricing policies lead to straightforward mathematical results on optimal investment decisions in generation and transmission expansion planning. This paper presents the mathematical conditions for optimal investment decisions.
New Adaptive Linear Combination Structure for Tracking/Estimating Phasor and Frequency of Power System
Wattanasakpubal, Choowong ; Bunyagul, Teratum ;
Journal of Electrical Engineering and Technology, volume 5, issue 1, 2010, Pages 28~35
DOI : 10.5370/JEET.2010.5.1.028
This paper presents new Adaptive Linear Combination Structure (ADALINE) for tracking/estimating voltage-current phasor and frequency of power system. To estimate the phasors and frequency from sampled data, the algorithm assumes that orthogonal coefficients and speed of angular frequency of power system are unknown parameters. With adequate sampled data, the estimation problem can be considered as a linear weighted least squares (LMS) problem. In addition to determining the phasors (orthogonal coefficients), the procedure estimates the power system frequency. The main algorithm is verified through a computer simulation and data from field. The proposed algorithm is tested with transient and dynamic behaviors during power swing, a step change of frequency upon islanding of small generators and disconnection of load. The algorithm shows a very high accuracy, robustness, fast response time and adaptive performance over a wide range of frequency, from 10 to 2000 Hz.
Algorithm for Detecting, Indentifying, Locating and Experience to Develop the Automate Faults Location in Radial Distribution System
Wattanasakpubal, Choowong ; Bunyagul, Teratum ;
Journal of Electrical Engineering and Technology, volume 5, issue 1, 2010, Pages 36~44
DOI : 10.5370/JEET.2010.5.1.036
This paper presents the design of an algorithm to detect, identify, and locate faults in radial distribution feeders of Provincial Electricity Authority (PEA). The algorithm consists of three major steps. First, the adaptive algorithm is applied to track/estimate the system electrical parameter, i.e. current phasor, voltage phasor, and impedance. Next process, the impedance rule base is used to detect and identify the type of fault. Finally, the current compensation technique and a geographic information system (GIS) are applied to evaluate a possible fault location. The paper also shows the results from field tests of the automate fault location and illustrates the effectiveness of the proposed fault location scheme.
Economic Power Dispatch with Discontinuous Fuel Cost Functions using Improved Parallel PSO
Mahdad, Belkacem ; Bouktir, T. ; Srairi, K. ; Benbouzid, M.EL. ;
Journal of Electrical Engineering and Technology, volume 5, issue 1, 2010, Pages 45~53
DOI : 10.5370/JEET.2010.5.1.045
This paper presents an improved parallel particle swarm optimization approach (IPPSO) based decomposed network for economic power dispatch with discontinuous fuel cost functions. The range of partial power demand corresponding to the partial output powers near the global optimal solution is determined by a flexible decomposed network strategy and then the final optimal solution is obtained by parallel Particle Swarm Optimization. The proposed approach tested on 6 generating units with smooth cost function, and to 26-bus (6 generating units) with consideration of prohibited zone effect, the simulation results compared with recent global optimization methods (Bee-OPF, GA, MTS, SA, PSO). From the different case studies, it is observed that the proposed approach provides qualitative solution with less computational time compared to various methods available in the literature survey.
Methodology for Determining of Generator Operation Point for Ensuring Voltage Stability Against Generator Faults in Jeju-Haenam HVDC System
Kang, Sang-Gyun ; Seo, Sang-Soo ; Lee, Byong-Jun ; Joo, Joon-Young ;
Journal of Electrical Engineering and Technology, volume 5, issue 1, 2010, Pages 54~60
DOI : 10.5370/JEET.2010.5.1.054
This paper presents a new algorithm for determining generator operation point for maintaining stability considering generator faults in Jeju-Haenam HVDC system. As the HVDC system consumes reactive power for the transmission of active power substantially, compensation of reactive power is essential. And the HVDC system is operated on frequency control mode. That is to say, the HVDC system almost manages system frequency. Therefore, we recognized that the Jeju system could be unstable if the reactive power consumed by the HVDC is insufficient when out-of-step occurs with large generators. When the solution of power flow analysis does not converge due to the unstable system phenomenon, we have difficulty in establishing countermeasures as the post-fault information is not available. In this paper, for the purpose of overcoming this difficulty in establishing countermeasures, we introduce the CPF(Continuation Power Flow) algorithm. This paper suggests an algorithm for calculating the output limitation of the generator to maintain the stability in case of generator fault in the Jeju system.
Modeling and Control of a Doubly-Fed Induction Generator (DFIG) Wind Power Generation System for Real-time Simulations
Byeon, Gil-Sung ; Park, In-Kwon ; Jang, Gil-Soo ;
Journal of Electrical Engineering and Technology, volume 5, issue 1, 2010, Pages 61~69
DOI : 10.5370/JEET.2010.5.1.061
This paper presents a study of a DFIG wind power generation system for real-time simulations. For real-time simulations, the Real-Time Digital Simulator (RTDS) and its user friendly interface simulation software RSCAD are used. A 2.2MW grid-connected variable speed DFIG wind power generation system is modeled and analyzed in this study. The stator-flux oriented vector control scheme is applied to the stator/rotor side converter control, and the back-to-back PWM converters are implemented for the decoupled control. The real-wind speed signal extracted by an anemometer is used for a realistic, reliable and accurate simulation analysis. Block diagrams, a mathematical presentation of the DFIG and a control scheme of the stator/rotor-side are introduced. Real-time simulation cases are carried out and analyzed for the validity of this work.
Multiobjective Optimal Reactive Power Flow Using Elitist Nondominated Sorting Genetic Algorithm: Comparison and Improvement
Li, Zhihuan ; Li, Yinhong ; Duan, Xianzhong ;
Journal of Electrical Engineering and Technology, volume 5, issue 1, 2010, Pages 70~78
DOI : 10.5370/JEET.2010.5.1.070
Elitist nondominated sorting genetic algorithm (NSGA-II) is adopted and improved for multiobjective optimal reactive power flow (ORPF) problem. Multiobjective ORPF, formulated as a multiobjective mixed integer nonlinear optimization problem, minimizes real power loss and improves voltage profile of power grid by determining reactive power control variables. NSGA-II-based ORPF is tested on standard IEEE 30-bus test system and compared with four other state-of-the-art multiobjective evolutionary algorithms (MOEAs). Pareto front and outer solutions achieved by the five MOEAs are analyzed and compared. NSGA-II obtains the best control strategy for ORPF, but it suffers from the lower convergence speed at the early stage of the optimization. Several problem-specific local search strategies (LSSs) are incorporated into NSGA-II to promote algorithm`s exploiting capability and then to speed up its convergence. This enhanced version of NSGA-II (ENSGA) is examined on IEEE 30 system. Experimental results show that the use of LSSs clearly improved the performance of NSGA-II. ENSGA shows the best search efficiency and is proved to be one of the efficient potential candidates in solving reactive power optimization in the real-time operation systems.
A Comprehensive Survey of Optimal Placement and Coordinated Control Techniques of FACTS Controllers in Multi-Machine Power System Environments
Singh, Bindeshwar ; Sharma, N.K. ; Tiwari, A.N. ;
Journal of Electrical Engineering and Technology, volume 5, issue 1, 2010, Pages 79~102
DOI : 10.5370/JEET.2010.5.1.079
This paper presents exhaustive review of various methods/techniques for coordinated control between FACTS controllers in multi-machine power systems. It also reviews various techniques/methods for optimal choice and allocation of FACTS controllers. Authors strongly believe that this survey article will be very much useful to the researchers for finding out the relevant references in the field of placement and coordination of FACTS Controllers.
Premium Power Quality Using Combination of Microturbine Unit and DC Distribution System
Noroozian, Reza ; Abedi, Mehrdad ; Gharehpetian, Gevorg ;
Journal of Electrical Engineering and Technology, volume 5, issue 1, 2010, Pages 103~115
DOI : 10.5370/JEET.2010.5.1.103
This paper discusses a DC distribution system which has been supplied by external AC systems as well as local microturbine distributed generation system in order to demonstrate an overall solution to power quality issue. Based on the dynamic model of the converter, a design procedure has been presented. In this paper, the power flow control in DC distribution system has been achieved by network converters. A suitable control strategy for these converters has been proposed, too. They have DC voltage droop regulator and novel instantaneous power regulation scheme. Also, a novel control system has been proposed for MT converter. Several case studies have been studied and the simulation results show that DC distribution system including microturbine unit can provide the premium power quality using proposed methods.
Electric Arc Furnace Voltage Flicker Mitigation by Applying a Predictive Method with Closed Loop Control of the TCR/FC Compensator
Kiyoumarsi, Arash ; Ataei, Mohhamad ; Hooshmand, Rahmat-Allah ; Kolagar, Arash Dehestani ;
Journal of Electrical Engineering and Technology, volume 5, issue 1, 2010, Pages 116~128
DOI : 10.5370/JEET.2010.5.1.116
Modeling of the three phase electric arc furnace and its voltage flicker mitigation are the purposes of this paper. For modeling of the electric arc furnace, at first, the arc is modeled by using current-voltage characteristic of a real arc. Then, the arc random characteristic has been taken into account by modulating the ac voltage via a band limited white noise. The electric arc furnace compensation with static VAr compensator, Thyristor Controlled Reactor combined with a Fixed Capacitor bank (TCR/FC), is discussed for closed loop control of the compensator. Instantaneous flicker sensation curves, before and after accomplishing compensation, are measured based on IEC standard. A new method for controlling TCR/FC compensator is proposed. This method is based on applying a predictive approach with closed loop control of the TCR/FC. In this method, by using the previous samples of the load reactive power, the future values of the load reactive power are predicted in order to consider the time delay in the compensator control. Also, in closed loop control, two different approaches are considered. The former is based on voltage regulation at the point of common coupling (PCC) and the later is based on enhancement of power factor at PCC. Finally, in order to show the effectiveness of the proposed methodology, the simulation results are provided.
Fuzzy Logic Speed Control Stability Improvement of Lightweight Electric Vehicle Drive
Nasri, Abdelfatah ; Hazzab, Abdeldjabar ; Bousserhane, Ismail.K ; Hadjeri, Samir ; Sicard, Pierre ;
Journal of Electrical Engineering and Technology, volume 5, issue 1, 2010, Pages 129~139
DOI : 10.5370/JEET.2010.5.1.129
To be satisfied with complex load condition of electric vehicle, fuzzy logic control (FLC) is applied to improve speed response and system robust performance of induction traction machine based on indirect rotor field orientation control. The proposed propulsion system consists of two induction motors (IM) that ensure the drive of the two back driving wheels of lightweight electric vehicle by means the vehicle used for passenger transportation. The electronic differential system ensures the robust control of the vehicle behavior on the road. It also allows controlling, independently, every driving wheel to turn at different speeds in any curve. Our electric vehicle fuzzy inference system control`s simulated in Matlab SIMULINK environment, the results obtained present the efficiency and the robustness of the proposed control with good performances compared with the traditional PI speed control, the FLC induction traction machine presents not only good steady characteristic, but with no overshoot too.
On-line Faults Signature Monitoring Tool for Induction Motor Diagnosis
Medoued, Ammar ; Lebaroud, Abdesselem ; Boukadoum, Ahcene ; Clerc, Guy ;
Journal of Electrical Engineering and Technology, volume 5, issue 1, 2010, Pages 140~145
DOI : 10.5370/JEET.2010.5.1.140
The monitoring and the diagnosis of the faults in induction motors starting from the stator current are very interesting, since it is an accessible and measurable quantity. The spectral analysis of the stator current makes it possible to highlight the characteristic frequencies of the faults but in a wide frequency range depending on half the sampling frequency, making it very difficult to monitor on-line the faults. In order to facilitate the use of the relevant frequencies of machine faults we proposed the extraction of the frequency components using two methods, namely, the amplitude and the instantaneous frequency. The theoretical bases of these methods were presented and the results were validated on a test bench with an induction motor of 5.5 kw.
Synthesis of TCO-free Dye-sensitized Solar Cells with Nanoporous Ti Electrodes Using RF Magnetron Sputtering Technology
Kim, Doo-Hwan ; Heo, Jong-Hyun ; Kwak, Dong-Joo ; Sung, Youl-Moon ;
Journal of Electrical Engineering and Technology, volume 5, issue 1, 2010, Pages 146~150
DOI : 10.5370/JEET.2010.5.1.146
A new type of dye-sensitized solar cell (DSC) based on a porous type Ti electrode without using a transparent conductive oxide (TCO) layer is fabricated for low-cost high-efficient solar cell application. The TCO-free DSC is composed of a glass substrate/dye-sensitized
nanoparticle/porous Ti layer/electrolyte/Pt sputtered counter electrode. The porous Ti electrode (~350 nm thickness) with high conductivity can collect electrons from the
layer and allows the ionic diffusion of
through the hole. The vacuum annealing treatment is important with respect to the interfacial necking between the metal Ti and porous
layer. The efficiency of the prepared TCO-free DSC sample is about 3.5% (ff: 0.48,
: 11.14 mA/
The MMIC VCO Design for Wireless Systems at Ka-Band
Lee, Han-Young ; Kim, Wan-Sik ;
Journal of Electrical Engineering and Technology, volume 5, issue 1, 2010, Pages 151~155
DOI : 10.5370/JEET.2010.5.1.151
Reconfigurable radio technology is needed to reconstruct frequency and modem functionality, which can be different in various regions. In addition, it makes a single mobile handset capable of supporting various standards of wireless communication and thus plays a key role in mobile convergence. An MMIC VCO (voltage controlled oscillator) has been developed for high power and wide bandwidth where Clapp-Gouriet type oscillators are adapted for series feedback, and was fabricated based on 0.15um pHEMT of TRW. The MMIC VCO was connected to an aluminar substrate on the carrier for testing. This MMIC VCO module showed good performance in comparison to existing works. Furthermore, it can be potentially extended to reconfigure an MMIC VCO for wireless systems such as military applications and satellite communications.
Electrical Properties Associated with Discharge Developments in Water Subjected to Impulse Voltages
Choi, Jong-Hyuk ; Lee, Bok-Hee ;
Journal of Electrical Engineering and Technology, volume 5, issue 1, 2010, Pages 156~162
DOI : 10.5370/JEET.2010.5.1.156
This paper describes electrical and optical characteristics of discharge developments in water under inhomogeneous fields caused by impulse voltages. Predischarge current and discharge light images were observed for different water resistivities and applied voltages between the hemispherical water tank and the needle electrode. The electrical parameters characterizing discharge developments are analyzed based on the discharge light images and voltage-current (V-I) curves, and electrical resistances derived by voltage and current waveforms. As a result, when the streamer corona is initiated at the tip of the needle electrode, the transient resistance suddenly drops and V-I curves form a `loop`. The length of streamer propagation is increased with increasing peak value of the applied voltage, and the streamer corona extension is enlarged with increasing water resistivity. The electrical resistances before streamer corona initiation are rarely changed by different applied voltages. On the other hand, the electrical resistances after streamer corona initiation are found to be inversely proportional to the peak value of the applied voltage, and the decreasing rates for higher water resistivities are much higher than those for lower water resistivities. The time to streamer corona initiation and the time to the second current peak become shorter as the voltage increases. Finally, the calculated resistances after streamer corona initiation are almost the same trace of measured resistances, but they are smaller than the measured values.
A Nonlinear Synchronization Scheme for Hindmarsh-Rose Models
Kim, Jung-Su ; Allgower, Frank ;
Journal of Electrical Engineering and Technology, volume 5, issue 1, 2010, Pages 163~170
DOI : 10.5370/JEET.2010.5.1.163
Multiple subsystems are required to behave synchronously or cooperatively in many areas. For example, synchronous behaviors are common in networks of (electro-) mechanical systems, cell biology, coupled neurons, and cooperating robots. This paper presents a feedback scheme for synchronization between Hindmarsh-Rose models which have polynomial vector fields. We show that the problem is equivalent to finding an asymptotically stabilizing control for error dynamics which is also a polynomial system. Then, an extension to a nonlinear observer-based scheme is presented, which reduces the amount of information exchange between models.
Resonant Parametric Perturbation Method to Control Chaos in Current Mode Controlled DC-DC Buck-Boost Converter
Kavitha, Anbukumar ; Uma, Govindarajan ;
Journal of Electrical Engineering and Technology, volume 5, issue 1, 2010, Pages 171~178
DOI : 10.5370/JEET.2010.5.1.171
Resonant parametric perturbation (RPP) method is an effective non-feedback method for controlling chaos. In this paper, the above method is applied for the current programmed buck-boost dc-dc converter which exhibits chaotic for wide parameter variations. The different possible operating regimes leading to chaotic operation of the current mode controlled buck-boost converter is discussed and the control of chaos by RPP method is demonstrated through computer simulations and experimental studies. The converter is stabilized to period 1 operation practically.