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VOLUME 6
NUMBER 1
WINTER-SPRING 2007

Table of Contents


Editorial Note


 

SPECIAL SECTION ON POWER ENGINEERING:
 


Optimal Design of Self-excited Cage Induction Generator Using Particle Swarm Optimization

S. Subramanian and R. Bhuvaneswar

PP. 3-10

Analysis of Electromechanical Oscillations and Extended Phase Compensation Design of Power System Stabilizer for Bisotoun Power Plant

M. Parniani, Gh. Zafarabadi, M. Rasouli, and P. Ansarimehri

PP. 11-18 

Optimal Intelligent Controller for Matrix Converter Induction Motor Drive System Authors

R. R. Joshi, R. A. Gupta, and A. K. Wadhwan

PP. 19-25 

Grid Service Model for Real Time Economic Load Dispatch

R. Ramesh and V. Ramachandran

PP. 26-30 

Three-Phase Fast Decoupled Load Flow for Unbalanced Distribution Systems

A. R. Hatami* and M. Parsa Moghaddam

PP. 31-35 

 

REGULAR PAPERS:
 


A Framework for Agent-Oriented Software Engineering Based on an Analytical Survey

M. R. Ayatollahzadeh Shirazi and A. Abdollahzadeh Barfouroush

PP. 36-47 

Hybrid Linear and Circular Antenna Arrays

E. Yaacoub, M. Al Husseini, A. Chehab, A. El Hajj, and K. Kabalan

PP. 48-54 

A Novel Bandwidth Allocation Algorithm for DOCSIS Based Hybrid Fiber Coaxial Networks

W. Al-Khatib and K.Gunavathi

PP. 55-61 

Fault Diagnosis in Deaerator Using Neural Networks

W. S. Srinivasan, P. Kanagasabapathy, and N. Selvaganesan

PP. 62-67 

Application of Harmonic Balance Finite Element Method to Evaluate Eddy Current Loss

B. Ramireddy

PP. 68-72 

Nonlinear Deflection Analysis of Electrostatic Micro-Actuators with Different Electrode and Beam Shapes

M. -H. Hsu

PP. 73-79 


Abstracts:


Optimal Design of Self-excited Cage Induction Generator Using Particle Swarm Optimization

S. Subramanian* and R. Bhuvaneswar*

* Electrical Engineering Department, Annamalai University, India


Abstract: Induction generators are widely used in various applications since they offer distinct advantages over conventional synchronous machines, resulting in a simplified design and installation at lower first cost and substantial savings in operation and maintenance expenses. This paper presents a Particle Swarm Optimization based procedure for optimization of self-excited cage induction generator design. The optimization problem is formulated as a nonlinear multivariable programming problem with nine independent variables and six constraints. Five different objective functions are considered for optimization in order to select a desired design. The procedure is tested on two cage induction generators and the results are compared with those obtained from sequential unconstrained minimization Technique (SUMT) in conjunction with Rosenbrock’s method of rotating co-ordinates. The results prove the supremacy of Particle Swarm optimization method in terms of convergence speed and accuracy.



Analysis of Electromechanical Oscillations and Extended Phase Compensation Design of Power System Stabilizer for Bisotoun Power Plant

M. Parniani*, Gh. Zafarabadi**, M. Rasouli***, and P. Ansarimehr***

* Department of Electrical Engineering, Sharif University of Technology, Iran

** Iranian Academic Center for Education, Culture and Research (ACECR), Sharif Branch, Iran

*** Department of Power System Operation, Niroo Research Institute, Tehran


Abstract: In this paper, performance of power system stabilizer (PSS) of a large thermal power plant, as tuned by the manufacturer, is investigated. Then, the stabilizer is redesigned based on extended phase compensation of the exciter input – electrical torque transfer function and root locus analysis; and its effect on local, interplant and inter-area electromechanical oscillations is thoroughly analyzed. As Bisotoun PSS has a special structure with two inputs, frequency and power, its performance is compared with power-speed PSS. The effect of PSS with existing and new tunings on transient stability is also studied. Simulation results are verified by experimental test records. .



Optimal Intelligent Controller for Matrix Converter Induction Motor Drive System

R. R. Joshi*, R. A. Gupta**, and A. K. Wadhwan***

* Department of Electrical Engineering, CTAE, India

** Department of Electrical Engineering, MNIT, India

*** Department of Electrical Engineering, MITS, India


Abstract: This paper proposes a new control algorithm for a matrix converter (MC) induction motor drive system. First, a new switching strategy, which applies a back-propagation neural network to adjust a pseudo dc bus voltage, is proposed to reduce the current harmonics of the induction motor. Next, a two-degree-of-freedom controller is proposed to improve the system performance. The controller design algorithm can be applied in an adjustable speed control system and a position control system to obtain good transient responses and good load disturbance rejection abilities. The implementation of this kind of controller is only possible by using a high-speed digital signal processor. In this paper, all the control loops, including current-loop, speed-loop, and position-loop are implemented by TM.



Grid Service Model for Real Time Economic Load Dispatch

R. Ramesh* and V. Ramachandran**

* Department of Electrical and Electronics Engineering, Anna University, India

** Department of Computer Science Engineering, Anna University, India


Abstract: The main objective of this paper is to develop a distributed model using grid environment through which the economic load dispatch solutions of multi-area power systems can be obtained continuously. Grid computing is a viable solution in order to exploit the enormous amount of computing power available across Internet to solve large interconnected power system problems. A grid service model is proposed for economic load dispatch, which provides the solutions at specific intervals of time. The proposed model is designed in such a way that any node in the grid can provide the economic load dispatch (ELD) solution. The node which serves as a server node at a specific instance in the grid can obtain the power system data from other client grid nodes and responds with economic load dispatch solutions. The proposed model is highly distributed and has inherent features of scalability, reliability and also uses all available computing power, hence economic feasibility of analyzing power system problems was taken care implicitly.



Three-Phase Fast Decoupled Load Flow for Unbalanced Distribution Systems

A. R. Hatami* and M. Parsa Moghaddam*

* Electrical Engineering Department, Tarbiat Modares University, Tehran, Iran


Abstract: This paper presents a new, efficient and robust three-phase load flow for unbalanced distribution systems. The proposed method uses equivalent current injections, based on Newton-Raphson method. The load flow issue is considered as an optimization problem and is decoupled into two subproblems without using any assumptions. The Jacobian matrix is set to be constant, thus, the method is fast, robust and efficient. The proposed method has been tested on the IEEE 13 Bus Radial Distribution Test Feeder with satisfactory results.



A Framework for Agent-Oriented Software Engineering Based on an Analytical Survey

M. R. Ayatollahzadeh Shirazi* and A. Abdollahzadeh Barfouroush*

* Computer Engineering and IT Department, Amirkabir University of Technology, Iran


Abstract: Agent technology enhances the ability of software engineers to develop open, complex and distributed applications and now an increasing number of problems in industrial, commercial, medical and networking application domains are being solved by agent-based solutions. In developing these solutions, practitioners need appropriate methods, techniques and tools. In this paper, we introduce and justify agent-oriented software engineering as a layered technology. The layers of this technology are quality, agent-oriented software development process, agent-oriented methods, agent-based system architecture and agent development tools. This pragmatic approach will help developers and project managers to remove many pitfalls of agent-oriented software development, helps researchers to determine the existing gaps in the current works and helps tool developers to organize their efforts for constructing agent-based tools. On the basis of this approach, an investigation on the current works in agent-oriented software engineering is presented. In this paper, umbrella activities for complementing the main activities and steps in the agent-based development are introduced and described and a new classification and definition of testing activities for agent-based systems is presented.



Hybrid Linear and Circular Antenna Arrays

E. Yaacoub*, M. Al Husseini*, A. Chehab*, A. El Hajj*, and K. Kabalan*

* Department of Electrical and Computer Engineering, American University of Beirut, Lebanon


Abstract: The class of Hybrid Linear and Circular Antenna Arrays is presented. The properties of linear and circular antenna arrays are combined to obtain hybrid array types: concentric circular, cylindrical, and coaxial cylindrical antenna arrays. These three types are defined, the expressions of their array factors are derived, their directivities and half power beam widths (HPBW) are simulated. The obtained plots are approximated by curve fitting. Different combinations of excitation currents (e.g. uniform, Chebyshev, Bessel, …) can exist on the elements of the same antenna array.



A Novel Bandwidth Allocation Algorithm for DOCSIS Based Hybrid Fiber Coaxial Networks

W. Al-Khatib* and K.Gunavathi*

* Department of Electronics and Communication Engineering, Anna University, India


Abstract: Data-Over-Cable Service Interface Specifications (DOCSIS) is developed for data transmissions over cable networks. DOCSIS is intended to support IP flows with significantly higher data rate links for high quality data, audio, video and interactive services. It is important to provide traffic scheduling mechanisms to support Quality of Service (QoS) for such applications. DOCSIS defines six upstream services for supporting per-flow QoS. Among them it uses rt-PS service for real-time VBR traffic which has burst nature. The Headend provides periodic opportunities for unicast request, namely polling, which yields higher delay and not suitable for real-time services. In this paper, a novel scheduling mechanism and bandwidth allocation algorithm has been proposed to support VBR multimedia traffic over DOCSIS. The proposed Dynamic Unsolicited Grant Service (DUGS) scheduling algorithm makes use of piggybacking request and changes the unsolicited grant size allocation dynamically. It is shown through simulation results that throughput, channel utilization and delay performance have been improved in case of DUGS, compared with current DOCSIS protocol. This algorithm can also keep fairness among connections.



Fault Diagnosis in Deaerator Using Neural Networks

S. Srinivasan*, P. Kanagasabapathy*, and N. Selvaganesan**

* Department of Instrumentation Engineering, Anna University, India

** Department of EEE, Pondicherry Engineering College, India


Abstract: Prompt detection and diagnosis of faults in industrial processes are essential to minimize the production losses and increase the safety of the operator and the equipment. Several techniques are available in the literature to achieve these objectives. Neural networks are increasingly employed for fault diagnosis. This paper describes the application of different structures of neural networks like Self–Organizing Map neural network (SOM), Back Propagation (BP) and Radial Basis Function neural networks (RBF) for detecting faults of a deaerator in the thermal power plant unit. Eight types of faults are introduced in the simulated system and detected using these networks. The relative merits and demerits of using the three different structures are also discussed.



Application of Harmonic Balance Finite Element Method to Evaluate Eddy Current Loss

B. Ramireddy*

* Pondicherry Engineering College, India


Abstract: Harmonic balance finite element method (HBFEM) is used to estimate the fundamental and harmonic components of magnetic field inside a specimen of ferromagnetic core, when it is subjected to single excitation at its surface. Subsequently iron losses are calculated. For the double excitation, if the signals are incommensurate, then numerical methods fails to yield fundamental and harmonic components of each of signal at various layers. This difficulty has been overcome by the proposed HBFEM with M-functions. The validity of M-functions in respect of nonlinearity of magnetization curve and eddy current loss is verified experimentally.



Nonlinear Deflection Analysis of Electrostatic Micro-Actuators with Different Electrode and Beam Shapes

M. -H. Hsu*

* Department of Electrical Engineering, National Penghu University, Taiwan


Abstract: The nonlinear pull-in behavior for different electrostatic micro-actuators is simulated in this work. The difficulty of nonlinear equation is overcome using the differential quadrature method and Wilson- method. Several characteristics of different combination of shaped fixed-fixed beam and curved electrode are also observed to optimize the design in this paper. The nonlinear deflection of uniform actuator and non-uniform actuator solved using the differential quadrature method are efficient. The stresses are determined for this par electrostatic micro-actuator design. The effects of applied voltage, squeeze film force, external loading and residual axial loading on the behavior of the electrostatic actuator are investigated. It is needed to consider the squeeze film force and residual axial loading in the fixed-fixed micro-actuator design.



 

ISSN: 1682-0053
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