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Application of Particle Swarm Optimization Technique
to Alternator Design
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V P Sakthivel, R Bhuvaneswari and S Subramanian
This paper presents a new methodology for alternator design using Particle Swarm Optimization
(PSO) method to minimize the material cost and regulation and to maximize the
efficiency. The design problem of an alternator is considered a nonlinear, multivariable constrained optimization problem. In this
context, the design is optimized using three different objective functionscost, regulation and efficiency. The
design procedure consists of a system of nonlinear equations, which defines alternator characteristics,
performance, magnetic stresses and thermal limits. This procedure employs PSO technique to search for optimal
values of machine variable without constraint violation. To verify the consistency, the proposed method has
been applied to two sample alternators and the results are compared with that of
Hooke-Jeeves (HJ) method. Computational results show the effectiveness of the proposed design.
© 2010 IUP. All Rights Reserved.
MATLAB/Simulink-Based Modeling
and Operation of Power System Stabilizer
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A Ragavendiran, R Gnanadass and M Arounassalame
This paper describes the operating performance of the Power System Stabilizer (PSS) for different
power system case studies. The functional blocks of PSS are developed in Simulink and the simulation carried
out. The damping oscillation variation of PSS for the various power system conditions (light, nominal and
high load and fault) is carried out and the voltage and reactive power variations are illustrated. The PSS
system behavior is demonstrated on Single Machine Infinite Bus (SMIB) model and simulation carried out in
Simulink-based MATLAB environment.
© 2010 IUP. All Rights Reserved.
Adequacy Assessment of a Distribution System
Having Distributed Generation (DG) Under Extreme
Probability Distributions
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L D Arya, Atul Koshti, A K Ganguly and Rizwan Sheikh
This paper describes a technique for evaluating reliability of a composite distribution system having
Distribution Generator (DG) sets. The capacity of a composite distribution system includes capacity of a
distribution substation and distribution generator sets. The capacity of a distribution substation has been assumed to be
a continuous random variable whereas Markov modeling has been adopted for checking availability of DG
sets. Extreme minimum and maximum distributions have been used for capacity and load on the distribution
system. Therefore, it is worst case reliability evaluation of the composite distribution system. Probability of failure
of the composite distribution supply system has been evaluated using Monte Carlo simulation. A case study
has been considered for explaining the developed algorithm.
© 2010 IUP. All Rights Reserved.
Reduced-Order Model of Disk Drive Read System
Using Hybrid Method
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P Munaswamy and R V S Satyanarayana
A new hybrid method for the order reduction of a high-order, linear, time-invariant disk drive read system
is proposed. The method generates a lower-order stable model, retaining both the initial Markov parameters
and time moment of the original system. The method is simple, direct and computationally superior compared
to other methods. The reduced-order model transfer function of a disk drive read system is derived using
the proposed method. The responses of the original system and the second-order reduced system for unit
step and unit impulse inputs are evaluated for amplifier gain value of Ka = 10. It is observed that the
transient response of the second-order system obtained by the proposed method is significantly improved.
© 2010 IUP. All Rights Reserved.
Single-Phase AC Voltage Regulator Using
AC Chopper with Series Transformer
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Anoop Mathew, N O Gunasekar, D Bensiker Raja Singh and S Uma Mageswaran
This paper describes a step-down AC voltage regulator using an AC chopper and auxiliary transformer, which
is connected in series to the main input. The
detailed design of the AC regulator, logic, and Pulse Width
Modulation (PWM) pattern of the AC chopper are described. The proposed AC regulator has many
benefits, such as fast voltage control, high efficiency, and simple control logic. Experimental results indicate that it can be used as
a step-down AC voltage regulator for power saving purposes very efficiently.
© 2010 IUP. All Rights Reserved.
Dielectric Properties of Recycled Poly
(Ethylene Terephthalate) (rPET) Composites with Nanoclay Fillers
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S Rajarajan and J Raja
Polymeric materials can be filled with several inorganic and/or natural compounds in order to get a wide
array of property enhancements like increased stiffness and strength, improved solvent and UV resistance,
greater dimensional stability, change in electrical conductivity and enhanced gas barrier properties. The
property improvements of clay-based nanocomposites are due to the nanoscale nature of the formed system
resulting in very high surface areas. Nanocomposites based on polymer clay mixtures are a growing area of interest
due to their potential in flexible applications. In this study, recycled Poly (Ethylene Terephthalate) (rPET)
was mixed with organically modified alkyl ammonium montmorillonite nanoclay in the contents of 1, 2 and
5 weight%. Cloisite 30B is a montmorillonite modified with a ternary ammonium salt, whereas Cloisite 15A
and Cloisite 25A are montmorillonite modified with quaternary ammonium salts. This is the reason why
the hydrophobicity of Cloisite 30B is higher than the other clay types. This leads to a thorough study on
Cloisite 30B to find the dielectric property. Optimum clay content was selected as 2 weight%. Using this clay
content, variable clay type samples were prepared. The experimental results show that 2 weight% Cloisite 30B is
better in respect of dielectric properties.
© 2010 IUP. All Rights Reserved.
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