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Power
System Security: A Review
--
A K Sinha, J Hazra, B K Saharoy, P Dutta and A Sengupta
The
present day electric power system, is a complex and highly
networked entity. The large interconnected electric power
network is vulnerable to several disturbances that pose a
major threat to power system security, sometimes leading to
major blackouts. The objective of this paper is to describe
the problem of power system security and briefly discuss the
various security assessment methods, and examine their individual
advantages and disadvantages. Some preventive and corrective
counter-measures to enhance the system security are also discussed
briefly.
© 2006 IUP . All Rights Reserved.
Fiber-optic
Fluorescence Temperature Sensors
--
R
P Khare
Optical
fibers are being increasingly used in sensing various parameters
in industrial and other environments due to their virtues
of immunity to Electromagnetic Interference (EMI) and Radio
Frequency Interference (RFI), chemical passivity, small size,
low weight, etc; and their ability to interface with a wide
variety of measurands. This paper briefly reviews the fiber-optic
techniques of sensing temperature using fluorescence emitted
by certain materials, normally phosphors.
© 2006 IUP . All Rights Reserved.
Neuro-Fuzzy
Control Algorithm for Active Power Filters
-- Alka
Mahajan, Parmod Kumar and Bhim Singh
This
paper proposes a combination of neural networks with fuzzy
logic to produce a fuzzy controller with fast response. The
fuzzy neural network uses neural nodes and links to connect
input variables to fuzzifiers, to define fuzzy rules and combine
outputs into a control action. This new method has been applied
to the problem of fuzzy control of a shunt active power filter
designed for harmonic current elimination. The performance
of the proposed method for training and test data is examined
by Matlab simulations and is found to optimize the fuzzy control
performance.
© 2006 IUP . All Rights Reserved.
Simulation
of Power Plant Response under Free Governor Mode of Operation
--
M S R Murty
Power
system frequency is an important indicator of the quality
of power supply. As per the regulations of The Indian Electricity
Act, the frequency has to be maintained within ±3% of
the rated frequency, namely, 50 Hz. However, in India, the
frequency is always low and this causes severe problems to
the connected load and power generating equipment. In the
electricity grid code introduced recently in India, the Free
Governor Mode of Operation (FGMO) has been made mandatory
for power generating companies. With this, the frequency profile
is expected to improve considerably. The success of the FGMO
depends on the capabilities of power plants to respond to
the frequency changes. A mathematical simulation can provide
an insight to the response behavior of various types of power
plants and their turbine governing systems. In this paper,
the response characteristics of thermal and hydro power plants
are studied by simulating the detailed mathematical models
of their turbine governing systems.
© 2006 IUP . All Rights Reserved.
Cytological
Studies on the Spermatogenesis of a Digenetic Trematode Encyclometra
japonica Yoshida and Ozaki, 1929
-- R
M Saxena
Spermatogenesis
of Encyclometra japonica is of rosette type, wherein the dividing
cells remain attached to each other by a short cytoplasmic
stalk. Successive mitotic divisions of primordial germ cells
give rise to primary spermatogonia, which again by three mitotic
and two meiotic divisions give rise to the 32-celled spermatids
stage. Six bivalents are clearly visible during metaphase-I.
A few peculiarities like pyknosis, primary spermatocytes and
vacuoles in the elongating nucleus of the spermatids have
been observed. A centriole appeared between the pointed end
of the nucleus and the cytoplasmic boundary. The cytoplasm
of the spermatid grows out from the region of the centriole
in the form of a filament, the sperm tail. Each sperm consists
of a nuclear head and an elongated cytoplasmic tail.
© 2006 IUP . All Rights Reserved.
Public
Transport and Co-operative Games: A Case Study of Asmara City
-- M
V Durga Prasad
This
paper presents an application of co-operative transferable
utility game as a case study of public transport in the city
of Asmara. It is shown that allocation of core concepts like
nucleon and nucleolus, can also be computed by a different
approach. Players in a co-operative transferable utility game
have been interpreted as route numbers, and total number of
trips that can be operated in a day as the value. Implementation
of solutions is also discussed.
© 2006 IUP . All Rights Reserved.
Computer-aided
Stock Layout of Rectangular Sheet Metal Parts
-- Naveen
Kumar
A
major problem faced by many industries like sheet metal, garment,
foot-wear, shipbuilding etc., is that of the stock layout.
Stock layout problem is nothing but allocation of parts on
to the stock sheet. An efficient stock layout can reduce material
waste to a minimum, thereby reducing the product cost. In
industries, stock layout has always been carried out manually
and is followed even today. This procedure becomes tedious
and time consuming when the number of parts to be nested is
large with a variety of shapes. Nowadays, computer-aided stock
layout techniques are becoming more popular because of their
ability to produce better results in a lesser time. In this
article, two heuristics: (a) complementary area heuristics
and (b) modified area heuristics, have been developed to carry
out the stock layout of rectangular parts.
© 2006 IUP . All Rights Reserved. |
