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
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.
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