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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 4, Issue 4 - Dec 2009
Volume 4, Issue 3 - Sep 2009
Volume 4, Issue 2 - Jun 2009
Volume 4, Issue 1 - Mar 2009
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Efficient Lambda Logic Based Optimisation Procedure to Solve the Large Scale Generator Constrained Economic Dispatch Problem
Adhinarayanan, T. ; Sydulu, M. ;
Journal of Electrical Engineering and Technology, volume 4, issue 3, 2009, Pages 301~309
DOI : 10.5370/JEET.2009.4.3.301
A simple and efficient Lambda logic (
) based algorithm is proposed for the solution of the generator constrained economic dispatch problem when the generating units having prohibited zones. The proposed method solves the economic dispatch (ED) problem that takes into account ramprate limits, transmission losses and prohibited operating zones in the power system operation. The proposed method uses a simple heuristic rule based on average power of prohibited operating zones which produces the feasibility of solution for the restricted operating units. The effectiveness of the algorithm is tested on five different test systems and the performance compared with other relevant methods reported in the literature. In all the cases, the proposed algorithm performs better than the previous existing algorithms with a less computational burden.
Voltage Stability Enhancement by Optimal Placement of UPFC
Kowsalya, M. ; Ray, K.K. ; Shipurkar, Udai ; Saranathan ;
Journal of Electrical Engineering and Technology, volume 4, issue 3, 2009, Pages 310~314
DOI : 10.5370/JEET.2009.4.3.310
This paper presents the improvement of the voltage profiles of power system networks by the inclusion of Unified Power Flow Controller (UPFC). The mathematical model of the UPFC is incorporated in the load flow algorithm and the L-index is calculated for the different values of the control parameter r
. The positioning of the UPFC device is changed to minimize the sum of the squares of the L-indices at all load buses. The test cases considered for the improvement of voltage profile with the WSCC 9-bus and IEEE 30 bus system. With the best position of UPFC along with the control parameters the improvement in voltage profile of the power system networks are obtained. The results obtained are quite encouraging compared with other techniques used to identify the best location of UPFC.
Strategy based PSO for Dynamic Control of UPFC to Enhance Power System Security
Mahdad, Belkacem ; Bouktir, T. ; Srairi, K. ;
Journal of Electrical Engineering and Technology, volume 4, issue 3, 2009, Pages 315~322
DOI : 10.5370/JEET.2009.4.3.315
Penetration and installation of a new dynamic technology known as Flexible AC Transmission Systems (FACTS) in a practical and dynamic network requires and force expert engineer to develop robust and flexible strategy for planning and control. Unified Power Flow Controller (UPFC) is one of the recent and effective FACTS devices designed for multi control operation to enhance the power system security. This paper presents a dynamic strategy based on Particle Swarm Optimization (PSO) for optimal parameters setting of UPFC to enhance the system loadability. Firstly, we perform a multi power flow analysis with load incrementation to construct a global database to determine the initial efficient bounds associated to active power and reactive power target vector. Secondly a PSO technique applied to search the new parameters setting of the UPFC within the initial new active power and reactive power target bounds. The proposed approach is implemented with Matlab program and verified with IEEE 30-Bus test network. The results show that the proposed approach can converge to the near optimum solution with accuracy, and confirm that flexible multi-control of this device coordinated with efficient location enhance the system security of power system by eliminating the overloaded lines and the bus voltage violation.
Thermal Unit Commitment Using Binary Differential Evolution
Jeong, Yun-Won ; Lee, Woo-Nam ; Kim, Hyun-Houng ; Park, Jong-Bae ; Shin, Joong-Rin ;
Journal of Electrical Engineering and Technology, volume 4, issue 3, 2009, Pages 323~329
DOI : 10.5370/JEET.2009.4.3.323
This paper presents a new approach for thermal unit commitment (UC) using a differential evolution (DE) algorithm. DE is an effective, robust, and simple global optimization algorithm which only has a few control parameters and has been successfully applied to a wide range of optimization problems. However, the standard DE cannot be applied to binary optimization problems such as UC problems since it is restricted to continuous-valued spaces. This paper proposes binary differential evolution (BDE), which enables the DE to operate in binary spaces and applies the proposed BDE to UC problems. Furthermore, this paper includes heuristic-based constraint treatment techniques to deal with the minimum up/down time and spinning reserve constraints in UC problems. Since excessive spinning reserves can incur high operation costs, the unit de-commitment strategy is also introduced to improve the solution quality. To demonstrate the performance of the proposed BDE, it is applied to largescale power systems of up to 100-units with a 24-hour demand horizon.
The On-Line Voltage Management and Control Solution of Distribution Systems Based on the Pattern Recognition Method
Ko, Yun-Seok ;
Journal of Electrical Engineering and Technology, volume 4, issue 3, 2009, Pages 330~336
DOI : 10.5370/JEET.2009.4.3.330
This paper proposes an on-line voltage management and control solution for a distribution system which can improve the efficiency and accuracy of existing off-line work by collecting customer voltage on-line as well as the voltage compensation capability of the existing ULTC (Under Load Tap Changer) operation and control strategy by controlling the ULTC tap based on pattern clustering and recognition. The proposed solution consists of an ADVMD (Advanced Digital Voltage Management Device), a VMS (Voltage Management Solution) and an OLDUC (On-Line Digital ULTC Controller). An on-line voltage management emulator based on multi-thread programming and the shared memory method is developed to emulate on-line voltage management and digital ULTC control methodology based on the on-line collection of the customer`s voltage. In addition, using this emulator, the effectiveness of the proposed pattern clustering and recognition based ULTC control strategy is proven for the worst voltage environments for three days.
Optimum Allocation of Reactive Power in Real-Time Operation under Deregulated Electricity Market
Rajabzadeh, Mahdi ; Golkar, Masoud A. ;
Journal of Electrical Engineering and Technology, volume 4, issue 3, 2009, Pages 337~345
DOI : 10.5370/JEET.2009.4.3.337
Deregulation in power industry has made the reactive power ancillary service management a critical task to power system operators from both technical and economic perspectives. Reactive power management in power systems is a complex combinatorial optimization problem involving nonlinear functions with multiple local minima and nonlinear constraints. This paper proposes a practical market-based reactive power ancillary service management scheme to tackle the challenge. In this paper a new model for voltage security and reactive power management is presented. The proposed model minimizes reactive support cost as an economic aspect and insures the voltage security as a technical constraint. For modeling validation study, two optimization algorithm, a genetic algorithm (GA) and particle swarm optimization (PSO) method are used to solve the problem of optimum allocation of reactive power in power systems under open market environment and the results are compared. As a case study, the IEEE-30 bus power system is used. Results show that the algorithm is well competent for optimal allocation of reactive power under practical constraints and price based conditions.
Multi-Area Unit Commitment with Bilateral Contract Approach in Deregulated Electricity Market
Selvi, S.Chitra ; Devi, R.P.Kumudini ; Rajan, C.Christober Asir ;
Journal of Electrical Engineering and Technology, volume 4, issue 3, 2009, Pages 346~352
DOI : 10.5370/JEET.2009.4.3.346
The eventual goal of this paper is to help the generating companies and load-serving entities to choose appropriate relative levels of interconnected system versus bilateral trades while considering risk, and economic performance. In competitive power markets, electricity prices are determined by balance between demand and supply in electric power exchanges or bilateral contracts. The problem formulation is bilateral contract incorporated into Multi-area unit commitment with import/export and tie-line constraints. This proposed method considers maximizing own profit or minimize the operating cost among the generating companies in multi-area system. The feasibility of the proposed algorithm has been demonstrated using IEEE system with four areas and experimental results shows that proposed method is reliable, fast and computationally efficient
Security Cost Analysis with Linear Ramp Model using Contingency Constrained Optimal Power Flow
Lyu, Jae-kun ; Kim, Mun-Kyeom ; Park, Jong-Keun ;
Journal of Electrical Engineering and Technology, volume 4, issue 3, 2009, Pages 353~359
DOI : 10.5370/JEET.2009.4.3.353
This paper proposes a novel technique for calculating the security costs that properly includes ramping constraints in the operation of a deregulated power system. The ramping process is modeled by a piecewise linear function with certain assumptions. During this process, a ramping cost is incurred if the permissible limits are exceeded. The optimal production costs of the power producers are calculated with the ramping cost included, considering a time horizon with N-1 contingency cases using contingency constrained optimal power flow (CCOPF), which is solved by the primal-dual interior point method (PDIPM). A contingency analysis is also performed taking into account the severity index of transmission line outages and its sensitivity analysis. The results from an illustrative case study based on the IEEE 30-bus system are analyzed. One attractive feature of the proposed approach is that an optimal solution is more realistic than the conventional approach because it satisfies physical constraints, such as the ramping constraint.
Parameter Estimation of Three-Phase Induction Motor by Using Genetic Algorithm
Jangjit, Seesak ; Laohachai, Panthep ;
Journal of Electrical Engineering and Technology, volume 4, issue 3, 2009, Pages 360~364
DOI : 10.5370/JEET.2009.4.3.360
This paper suggests the techniques in determining the values of the steady-state equivalent circuit parameters of a three-phase induction machine using genetic algorithm. The parameter estimation procedure is based on the steady-state phase current versus slip and input power versus slip characteristics. The propose estimation algorithm is of non-linear kind based on selection in genetic algorithm. The machine parameters are obtained as the solution of a minimization of objective function by genetic algorithm. Simulation shows good performance of the propose procedures.
Inverse Problem Methodology for Parameter Identification of a Separately Excited DC Motor
Hadef, Mounir ; Mekideche, Mohamed Rachid ;
Journal of Electrical Engineering and Technology, volume 4, issue 3, 2009, Pages 365~369
DOI : 10.5370/JEET.2009.4.3.365
Identification is considered to be among the main applications of inverse theory and its objective for a given physical system is to use data which is easily observable, to infer some of the geometric parameters which are not directly observable. In this paper, a parameter identification method using inverse problem methodology is proposed. The minimisation of the objective function with respect to the desired vector of design parameters is the most important procedure in solving the inverse problem. The conjugate gradient method is used to determine the unknown parameters, and Tikhonov`s regularization method is then used to replace the original ill-posed problem with a well-posed problem. The simulation and experimental results are presented and compared.
Analysis and Comparison of a Permanent-Magnet DC Motor with a Field-Winding DC Motor
Kiyoumarsi, Arash ;
Journal of Electrical Engineering and Technology, volume 4, issue 3, 2009, Pages 370~376
DOI : 10.5370/JEET.2009.4.3.370
The influence of magnetic saturation on electromagnetic field distribution in both a permanent-magnet direct-current (PMDC) motor and a field-winding (wound-field) direct-current (FWDC) motor, with the same output mechanical power, has been studied. In this paper, an approximate analytical method and time-stepping Finite Element Method (FEM) are used for prediction of Back-EMF and electromagnetic torque. No-load and rotor-lucked conditions, according to experimental measurements, and the FEM and analytical method studies of the motors have been considered. A sensitivity analysis has also been successfully accomplished on the major design parameters that affect motor performance. At last, these two DC motors are compared, in spite of their differences, on the basis of measured output characteristics.
Optimal Design of an IPMSM for High-Speed Operation Using Electromagnetic and Stress Analysis
Seo, Jang-Ho ; Jung, Hyun-Kyo ;
Journal of Electrical Engineering and Technology, volume 4, issue 3, 2009, Pages 377~381
DOI : 10.5370/JEET.2009.4.3.377
In the development of an interior permanent magnet synchronous machine (IPMSM) for high-speed operation, the problem of mechanical stress of the rotor by centrifugal force becomes more essential as the speed and size of the machines increase. In this paper, the optimal design process combined with mechanical stress analysis was presented. In the analysis of mechanical stress, the node and element data obtained by the electromagnetic field analysis program are also used in the stress analysis. Therefore, the different pre-processing for the stress analysis program is no longer required. Therefore, the computing time of the new method is very short compared with the conventional approach, and when repeated analyzes of various models are required, this method is very useful. The validity of our methods was verified by comparing simulation results with conventional and experimental data.
Analysis of the Operating Point and Fault Current Contribution of a PEMFC as Distributed Generation (DG)
Moon, Dae-Seong ; Kang, Gi-Hyeok ; Chung, Il-Yop ; Won, Dong-Jun ;
Journal of Electrical Engineering and Technology, volume 4, issue 3, 2009, Pages 382~388
DOI : 10.5370/JEET.2009.4.3.382
Recently, hydrogen energy has been anticipated to change the paradigm of conventional power systems because it can expand sustainable energy utilization and conceptually provide remarkable flexibility to power system operation. Since hydrogen energy can be converted to electric energy through fuel cells, fuel cells are expected to play an important role in the future hydrogen economy. In this paper, a Proton Exchange Membrane Fuel Cell (PEMFC) is modeled as an equivalent circuit and its steady-state characteristics investigated using the model. PEMFCs can be connected to power systems through power conditioning systems, which consist of power electronic circuits, and which are operated as distributed generators. This paper analyzes the effects of the characteristics of the PEMFC internal voltages and investigated the dynamic responses of the PEMFC under fault conditions. The results show that the fault current contribution of the PEMFC is different from those of conventional generators and is closely related to its operating point.
Induction Machine Fault Detection Using Generalized Feed Forward Neural Network
Ghate, V.N. ; Dudul, S.V. ;
Journal of Electrical Engineering and Technology, volume 4, issue 3, 2009, Pages 389~395
DOI : 10.5370/JEET.2009.4.3.389
Industrial motors are subject to incipient faults which, if undetected, can lead to motor failure. The necessity of incipient fault detection can be justified by safety and economical reasons. The technology of artificial neural networks has been successfully used to solve the motor incipient fault detection problem. This paper develops inexpensive, reliable, and noninvasive NN based incipient fault detection scheme for small and medium sized induction motors. Detailed design procedure for achieving the optimal NN model and Principal Component Analysis for dimensionality reduction is proposed. Overall thirteen statistical parameters are used as feature space to achieve the desired classification. GFFD NN model is designed and verified for optimal performance in fault identification on experimental data set of custom designed 2 HP, three phase 50 Hz induction motor.
Investigation of a Method for RF Circuits Analysis Based on Electromagnetic Topology
Park, Yoon-Mi ; Chung, Young-Seek ; Cheon, Chang-Yul ; Jung, Hyun-Kyo ;
Journal of Electrical Engineering and Technology, volume 4, issue 3, 2009, Pages 396~400
DOI : 10.5370/JEET.2009.4.3.396
In this paper, electromagnetic topology (EMT) was used to analyze the electromagnetic compatibility (EMC) of RF circuits including passive and active components. It is difficult to obtain usable results for problems relating to electromagnetic coupling in complex systems when using conventional numerical or experimental methods. Thus it is necessary to find a new methodology for analyzing EMC problems in complicated electromagnetic environments. In order to consider the nonlinear characteristics of active components, a SPICE diode model was used. A power detector circuit and the receiver circuit of a radio control (RC) car were analyzed and experimented in order to verify the validity of this method.
An Analytical Expression for Current Gain of an IGBT
Moon, Jin-Woo ; Chung, Sang-Koo ;
Journal of Electrical Engineering and Technology, volume 4, issue 3, 2009, Pages 401~404
DOI : 10.5370/JEET.2009.4.3.401
A simple analytical expression for a current gain of IGBT is derived in terms of the device parameters as well as a gate length dependent parameter, which allows for the determination of the current components of the device as a function of its gate length. The analytical results are compared with those from simulation results. A good agreement is found.
Polarization-Independent Multiwavelength-Switchable Filter Based on Polarization Beam Splitter and Fiber Coupler
Lee, Yong-Wook ;
Journal of Electrical Engineering and Technology, volume 4, issue 3, 2009, Pages 405~409
DOI : 10.5370/JEET.2009.4.3.405
A polarization-independent multiwavelength-switchable fiber filter is proposed based on a polarization beam splitter and fiber coupler, which can function as a polarization-independent transmission or reflection-type interleaving filter. The proposed filter consists of a polarization beam splitter and a Sagnac birefringence loop composed of a 50:50 coupler, high birefringent fibers, and two quarter-wave plates. In the proposed filter, a transmission-type interleaver with a channel isolation > 18 dB or a reflection-type one with a channel isolation of
dB, whose channel spacing and switching displacement were 0.8 and 0.4 nm in common, respectively, could be obtained. A channel interleaving operation could be performed by the proper control of waveplates within the Sagnac birefringence loop.
Study of Discharge in Point-Plane Air Interval Using Fuzzy Logic
Bourek, Yacine ; Mokhnache, Leila ; Nait Said, Nacereddine ; Kattan, Rafik ;
Journal of Electrical Engineering and Technology, volume 4, issue 3, 2009, Pages 410~417
DOI : 10.5370/JEET.2009.4.3.410
The objective of this paper is to study the discharge phenomenon for a point-plane air interval using an original fuzzy logic system. Firstly, a physical model based on streamer theory with consideration of the space charge fields due to electrons and positive ions is proposed. To test this model we have calculated the breakdown threshold voltage for a point-plane air interval. The same model is used to determine the discharge steps for different configurations as an inference data base. Secondly, using results obtained by the numerical simulation of the previous model, we have introduced the fuzzy logic technique to predict the breakdown threshold voltage of the same configurations used in the numerical model and make estimation on the insulating state of the air interval. From the comparison of obtained results, we can conclude that they are in accordance with the experimental ones obtained for breakdown discharges in different point-plane air gaps collected from the literature. The proposed study using fuzzy logic technique shows a good performance in the analysis of different discharge steps of the air interval.
Electron Transport Properties of Zn(phen)q Compared with Alq
Kim, Byoung-Sang ; Kim, Dong-Eun ; Choi, Gyu-Chae ; Park, Jun-Woo ; Lee, Burm-Jong ; Kwon, Young-Soo ;
Journal of Electrical Engineering and Technology, volume 4, issue 3, 2009, Pages 418~422
DOI : 10.5370/JEET.2009.4.3.418
We synthesized new electroluminescence materials [(1,10-phenanthroline)(8-hydroxyquinoline)] Zn(phen)q and investigated their electron transport properties. We used Zn(phen)q and
for the conductive materials and measured their electron transport properties as a function of the organic layer thickness. The difference between Zn(phen)q and
as electron transporting materials suggests that the electrical properties depends on the carrier injection.
An Analytical Approach for Design of Nth-band FIR Digital Filters with Equi-Ripple Passband
Moon, Dong-Wook ; Kim, Lark-Kyo ; Lim, Cheng-Chew ;
Journal of Electrical Engineering and Technology, volume 4, issue 3, 2009, Pages 423~428
DOI : 10.5370/JEET.2009.4.3.423
In FIR (Finite Impulse Response) filter applications, Nth-band FIR digital filters are known to be important due to their reduced computational requirements. The conventional methods for designing FIR filters use iterative approaches such as the well-known Parks-McClellan algorithm. The Parks-McClellan algorithm is also used to design Nth-band FIR digital filters after Mintzer`s research. However, a disadvantage of the Parks-McClellan algorithm is that it needs a large amount of design time. This paper describes a direct design method for Nth-band FIR Filters using Chebyshev polynomials, which provides a reduced design time over indirect methods such as the Parks-McClellan algorithm. The response of the resulting filter is equi-ripple in passband. Our proposed method produces a passband response that is equi-ripple to within a minuscule error, comparable to that of Mintzer`s design method which uses the Parks-McClellan algorithm.