Assam Don Bosco University Journals
Not a member yet
795 research outputs found
Sort by
Power Quality Enhancement in Wind Power Generation Integrated Distribution System using Fuzzy Logic Controlled CSC Based DVR
Get PDFIn this paper, a model of fuzzy logic controlled CSC based DVR system has been proposed with the objective of performing voltage regulation and harmonics reduction tasks simultaneously in a power distribution system. The distribution system is integrated with a standalone renewable energy source (RES) driven i.e. wind power generation system based on self excited induction generator (SEIG) supplying power to customers having a variety of loads. For power quality (PQ) enhancement in electric power distribution systems, the custom power devices (CPDs) designed with conventional controllers such as proportional- integral (PI), proportional-integral-derivative (PID) etc. are widely used. The objective of using CPD is to mitigate the PQ problems encountered in the power distribution system that includes short and long duration voltage variations, voltage imbalance, waveform distortions etc. Amongst the various types of CPDs, the dynamic voltage restorer (DVR) is considered to be one of the versatile CPD capable of solving multiple PQ problems. In most of the literatures, the DVR is found to be designed and implemented with voltage source converter (VSC) topology and not much research work has been reported on the application of current source converter (CSC) topology in DVR system over the last couple of decades. The proposed CSC based model has been simulated using MATLAB / Simulink for investigating its performance. The simulation results support the validity of the proposed model
Title, contents and foreword
No full textThis section contains the title of the journal, contents and the forewor
WET OXIDATION OF PHENOL ANALOGUES USING Mn(II)@Silica AS HETEROGENEOUS CATALYST
Get PDFToxic and bio-resistant phenolic compounds are some of the most common hazardous organics in aqueous systems presenting challenging problem in waste water treatment. In the present study, wet oxidation without a chemical oxidant was attempted using Mn(II)@silica as the catalyst. The catalysts were well characterized by physico-chemical characterization methods. The conversion of phenol, 2-chlorophenol and 2-nitrophenol was 89.7, 85.5 and 78.8 % with hydrothermally synthesized Mn(II)@silica, and 94.2, 91.1 and 89.4 % with impregnated Mn(II)@silica, respectively. The reactions followed pseudo first order kinetics. The effects of pH, reaction time, catalyst load, feed concentration, and temperature were investigated. GC-MS analysis showed that the persistent organics were oxidized to simpler end products. Further oxidation is expected lead to complete mineralization of the contaminants. Mn(II) coupled silica was noticed to be a better oxidation catalyst for the organic pollutants than the synthesized Mn(II)@silica
HVDC and Green Power Corridor: A Review
Get PDFHigh Voltage Direct Current transmission system can turn out to be the ideal power transmission system for bulk power and transferring clean power from remotely located hydroelectric dams to distant load centers. Therefore, the solution to the sudden increased demand for electricity can be found by evacuating remotely located bulk renewable energy and transmitting the clean power to load centers located at a significant distance away via HVDC link
Comparative Analysis of Different Control Schemes for DC-DC Converter
Get PDFDC-DC converters are some power electronic circuits that convert the DC voltage from one level to another. They have a very large area of applications ranging from computing to communication. They are widely used in appliance control transportations, and high-power transmission. Its increasing demand is based on its capability of electrical energy conversion. The basic topology of DC-DC converter are Buck converter and Boost converter, other topologies are derived from this two-basic topology. In this paper mathematical modelling of both Buck and Boost converters has been done. Some of the control schemes are summarized in this paper. Current mode control (CMC), PID, control including their advantages and disadvantages are highlighted in this paper
Sensitising gender to local cosmology: A participatory ethnographic gender and development approach from a Muslim community in Senegal
Get PDFThis article is concerned with the effectiveness of gender and development practice in diverse knowledge systems. Conventional theoretical and analytical frameworks and methodologies of gender and development reflect primarily secular epistemologies and it has yet to be addressed systematically how non-secular knowledge systems may be incorporated effectively in the design and implementation of gender programmes. This article presents a project from a Muslim rural community of Senegal that analysed gender realities through the prism of the local religio-cultural cosmology and explored community members’ responses to increasingly internationalised western ideals of gender equality. As an innovative methodology, participatory research techniques were integrated into short-term ethnographic investigations in an attempt to explore gender realities through the conceptual repertoire of the research participants. The study showed that understandings of subjectivity and gender norms were intertwined intricately with religio-cultural beliefs which influenced how participants conceived themselves and local gender relations and how they responded to western ideals of gender equality. Gender itself seemed to be conceptualised at a more profound ontological level emanating from religio-cultural beliefs. The implication is that gender-sensitive development in this community will need to account for this epistemological framework and to attune to religio-cultural sensibilities. The study also suggests that the participatory ethnographic methodology that was employed can facilitate a transition to an epistemology-sensitive gender and development practice; however it must be combined with reflexivity and be followed by more rigorous research
Contactless Rotor RPM Measurement using Raspberry Pi and Laser sensor
Get PDFThis paper presents an experimental study of high resolution rotation per minute (RPM) measurement of a rotating shaft using Laser sensor module. A novel method is implemented for measuring low speed as well as a high speed. Experiments are conducted using a raspberry pi which is based on ARM7 processor. The experimented results are presented for low speed as well as high speed separately and also calculated resolutions are shown
SOME IDENTITIES OF OVERPARTITION PAIRS INTO ODD PARTS
Get PDFRecently, Bernard L.S.~Lin has studied various arithmetic properties of the function , the number of overpartition pairs of into odd parts. In particular, he has obtained a number of Ramanujan-type congruences modulo 3 and modulo powers of 2. In this paper, we give proof of some of these congruences and find some other interesting congruences by employing elementary generating function dissection techniques
QUANTUM CHEMICAL MODELLING OF ION-MOLECULE COLLISIONS: A BRIEF OVERVIEW
Get PDFIn the theoretical study of ion-molecule collisions accurate construction of adiabatic potential and non-adiabatic coupling matrix elements plays central role and the accuracy of semi-classical methods (like eikonal method), quantum mechanical methods and simulation techniques like surface hopping dynamics solely depend on the accuracy of the calculated potentials and coupling matrix elements. In this paper we briefly describe various quantum chemical techniques adopted to construct the potential energy surface and coupling matrix elements with high accuracy