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Two Element Rectangular Microstrip Array Antenna
for X and Ku Band Operation
-- B Suryakanth and S N Mulgi
This paper presents a novel design and development of two element slot loaded rectangular
microstrip array antennas for dual bands—one at X and the other at Ku band of frequencies.
The effect of inclined L and L slots on the array elements with H slots in the ground
plane is studied experimentally for enhancing the bandwidth. Experimentally, it
is found that by using L slots on the array elements with H slots in the ground
plane, the bandwidth at Ku band can be enhanced from 16.8% to 32% without affecting
the operating bandwidth at X band and the nature of the broadside radiation characteristics.
The details of antenna design are described and experimental results are discussed.
The proposed antennas may find application in Synthetic Aperture Radar (SAR).
© 2011 IUP. All Rights Reserved.
An Experimental Study of the Effects of Different Mediums
on the Performance of RFID System
-- Sudip Dogra, K M Rajanna, Joyashree Bag and Subir Kumar Sarkar
Radio Frequency Identification (RFID) is an enabling wireless technology applicable
to a wide range of applications that provide organizations with unprecedented improved
visibility and traceability of items. They can be used in various fields for contactless
detection and identification purposes. Currently, practicing engineers and researchers
use trial-and-error approaches to decide the best conditions of the tag detection
and the influence factors which affect tag detectability. The passive RFID tags
are powered by a reader and the signals are greatly affected by various intervening
mediums. The tags may not be detectable sometimes due to the effect of these mediums.
Through experiments, it is realized that the passive tags kept on a metal surface
are not detectable at all. A detailed study of these effects is required before
design and implementation of RFID systems; otherwise the designed system may not
work properly. The reliability of a designed RFID system depends on the chosen frequency
of operation of the system and the surrounding medium. This paper presents the experimental
results of the effects of different mediums on passive RFID system performance.
The detectability and the range of the tags are measured with different intervening
mediums also by keeping the tags at detectable range with various angles. The effect
of different mediums on the detectability and range of tags has been studied.
© 2011 IUP. All Rights Reserved.
Analysis of Reactive Power Compensation
Using Unified Power Flow Controller
by a New Conduction Angle Controller
-- S Baskar and N Kumarappan
This paper presents the modeling and design of a Unified Power Flow Controller (UPFC)
using a new conduction angle control technique in the inverter. The proposed control
technique implements the 150 conduction mode for individual Insulated Gate Bipolar
Transistors (IGBTs) in the inverters. The UPFC can be operated using Sinusoidal
Pulse Width Modulation (SPWM) controllers to enhance the reactive power compensating
and regulating the line voltage and also reduce the harmonic in the transmission
line current and voltage. The 150 inverter is advantageous and increases the Root
Mean Square (RMS) values of output voltages, when compared to 120 mode and 180
mode. The total required Volt Ampere (VA) rating of the inverters is reduced greatly
over wide load conditions. The operating performance of UPFC is demonstrated on
Single Machine Infinite Bus (SMIB) transmission line system. The detailed UPFC simulation
in switching level model is performed in MATLAB/ SIMULINK environment. The result
shows that UPFC controller is capable of improving the voltage profile and real
and reactive power compensation in the proposed system.
© 2011 IUP. All Rights Reserved.
Security Constrained Optimal Power Flow
Using Particle Swarm Optimization
-- S Manoharan and A Marimuthu
This paper aims to find a solution for the Optimal Power Flow (OPF) problem with
security constraints by the Particle Swarm Optimization (PSO). The major objective
is to minimize the overall operating cost while satisfying the power flow equations
and system security. PSO has been used as the optimization tool, which uses reconstruction
operators and dynamic penalization for handling constraints. The reconstruction
operators allow the increase of the number of particles within the feasible region.
To demonstrate its robustness, the proposed algorithm was tested on IEEE 30 Bus
System and the proposed approach results were simulated using MATLAB.
© 2011 IUP. All Rights Reserved.
Congestion Management in Distribution Lines
-- P K Satpathy, Pradyumna Kumar Sahoo,
Sagarika Nath and Snigdha Mishra
Several researchers have contributed to the understanding of the mechanism of congestion
in transmission and distribution networks while focusing on the development of system
tools for congestion management. This research work is mostly devoted towards congestion
management in distribution lines based on a case study conducted over a section
of distribution network of Orissa state. The results of this study have been validated
on the MiPower platform, which considers two schemes (reconductoring of existing
distribution lines on one part and installation of a new express distribution feeder
on the other part) for performance evaluation. Results indicate that the former
scheme with reconductoring of existing distribution lines is more economical than
the latter scheme of installation of a new express distribution feeder.
© 2011 IUP. All Rights Reserved.
Latest Trends in SPV-Diesel Hybrid Power Generation System
-- Iranna Korachagaon
Increased energy demand is the main reason for seeking alternate energy sources.
Stringent pollution control norms and shortage of the conventional fossil fuels
have forced the mankind to look for economical alternate energy sources on a long-term
basis. Among renewable energy sources like solar, wind, biomass, tidal and Ocean
Thermal Energy Conversion (OTEC), Solar Photovoltaic (SPV) energy generation has
gained popularity because of reasons such as simplicity, low maintenance, free from
pollution and availability in abundance. This paper presents a technical review
of the latest trends in the SPV-diesel hybrid power generating systems.
© 2011 IUP. All Rights Reserved.
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