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Electrical, Electronics and Computer Science (SCEECS), 2012 IEEE Students' Conference on

Date 1-2 March 2012

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Displaying Results 1 - 25 of 120
  • [Copyright notice]

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    Freely Available from IEEE
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    Freely Available from IEEE
  • An effective design technique to reduce leakage power

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (146 KB) |  | HTML iconHTML  

    Now a day's low power Design is a essential requirement for This electronic document is a “live” template. The various components of your paper [title, text, heads, etc.] are already defined on the style hardware implementation. Technology moving into deep submicron region causes increase in leakage power. MTCMOS is promising technique for reducing leakage power but use of this technique results in delay overhead in active mode and data retention problem for sequential circuit. This paper propose a design technique for reducing the leakage power and data loss problem during sleep mode. Simulation results show that reduction in leakage power while preserving the state of the circuit. View full abstract»

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  • 3-Phase grid-connected Liquid Solar Arrays photovoltaic inverter control loop design

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (233 KB) |  | HTML iconHTML  

    In this paper a photovoltaic (PV) 3-phase inverter system is simulated jointly with its control in PSIM software. The conventional PV systems of today can be costly and this likely prevents wide-scale interest in fully implementing solar PV solutions. The simulation of the system is developed for testing control algorithm before a real-time implementation. The inverter allows full control of reactive power. The utilization of PV systems is rather low in northern European countries and could be increased by implementation of additional functionality such as uninterruptible power supply, local power quality improvement or ancillary services. The floating solar power units, called Liquid Solar Arrays (LSA), use concentrated photovoltaic technology where a lenses direct the light onto solar cells and move throughout the day to follow the sun. View full abstract»

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  • Phase estimation for grid synchronization using CORDIC algorithm with SRF-PLL

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (328 KB) |  | HTML iconHTML  

    The proper operation of grid connected inverter system is determined by grid voltage conditions such as phase, amplitude and frequency. In such applications, an accurate and fast detection of the phase angle, amplitude and frequency of the grid voltage is essential for reference current generation. Phase angle plays an important role in control being used to transform the feedback variables to a suitable reference frame in which the control structure is implemented. Hence grid synchronization has a significant role in the control of grid connected inverter system. However, accurate on-line tracking of phase angle of the grid voltages under distorted grid condition is critical especially; during line notching, voltage unbalance, voltage dips, frequency variations etc. This paper presents phase estimation technique for grid synchronization using CORDIC algorithm with Synchronous Reference Frame-Phase Locked Loop (SRF-PLL) during unbalanced three-phase grid voltage conditions. By proposing CORDIC algorithm with SRF PLL, we can largely reduce the computational time while it will be implemented in real time platform using FPGA or DSP. Computer simulations have been carried out using MATLAB-Simulink package for feasibility of the study. View full abstract»

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  • An efficient control on photovoltaic energy conversion system using modified perturb and observe technique for stand alone applications

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (222 KB) |  | HTML iconHTML  

    As the electric power supplied by solar array is dependent upon the isolation, temperature and array voltage, it is necessary to implement Maximum Power Point Tracking (MPPT) in order to move the solar array operating voltage close to the peak power point, therefore drawing the maximum power from the solar array. The solar array shall be integrated with a DC-DC converter and a control algorithm to search and track the maximum power continuously. The method is applicable to an array of photovoltaic cells to generate power. The DC-DC converter is responsible for the regulation of the output voltage at the peak power point while also providing a constant voltage. DC-AC conversion is done using inverter is useful for AC loads for stand-alone applications. View full abstract»

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  • Dual Gate enhancement-mode JFET (DG-JFET) for ultra low power applications

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (555 KB) |  | HTML iconHTML  

    Dual Gate enhancement mode Junction Field Effect Transistors (DG-JFETs) was recognized as one of the possible choice to continue the scaling beyond the conventional limits. The need for ultra-low voltage ICs necessitates the scaling of MOSFETs beyond 25nm. However, the advanced standard MOSFET devices and CMOS technologies have several limitations for ultra-low voltage analog operation and the JFET devices offer a great potential for such applications. The device architecture and performance of 16nm enhancement mode SOI DG-JFET is analyzed in this work. DAVINCI (a synopsis 3D device simulation tool) is used to analyze the device architecture and performance initially. The numerical device simulation results show that the enhancement mode DG-JFETs offer low threshold voltage and an excellent ON/OFF performance at a power supply voltage of 0.5 V required for ultra-low voltage analog ICs. View full abstract»

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  • Feasibility study of AC bridges in MEMS pressure sensors

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1191 KB) |  | HTML iconHTML  

    A study on the feasibility of using AC bridges in MEMS (Micro Electro Mechanical Systems) sensors is carried out in this project. Normally DC bridges are used in MEMS sensors to sense the output. AC measurements have some advantages over DC measurements like improved resolution, accuracy and aging information. In this work, a pressure sensor with 150kPa full scale span (FSS) is considered for studies. Schering bridge is used in this pressure sensor to sense the output. The main advantage of using Schering bridge is that aging information can be found out by calculating the dissipation factor. Sensitivity of the sensor is estimated as 9.3 × 10-3 mV/V/kPa. View full abstract»

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  • Promotion of renewable energy in Indian power sector moving towards deregulation

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (132 KB) |  | HTML iconHTML  

    Renewable energy is a sustainable and clean source of energy derived from nature. These technologies have long been recognized as an important part of the solution to address energy security concerns and ensure economic growth in an environment friendly manner. Deregulation has changed the traditional mission and mandates of power utilities in complex ways, and had large impacts on environmental, social, and political conditions for any particular country like India. The renewable energy based power generating systems can play a major role towards the fulfilment of energy requirements of restructured electricity market. In this paper, efforts have been made to summarize the availability, current status, environmental effects, promotion policies and future potentials & strategies of renewable energy options in India. View full abstract»

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  • Current status, policies and future perspectives of Indian power sector moving towards deregulation

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (142 KB) |  | HTML iconHTML  

    This Restructuring and deregulation of the electricity industry is a movement with the aim of achieving lower prices to customers through cost savings. The deregulation of electric power systems in many parts of the world has changed the mechanism of electricity pricing. India is in the processing on restructuring in power sector. Power planning will play an important role in the successful power reform and essential for Indian economic growth. Only a financially and commercially sound power sector can attract new investments. In Indian power sector, restructuring will substantially change power planning, especially the methodology of the power generation expansion planning. The evolution of power restructuring and deregulation policies in India needed to be considered to produce full benefits from power utility deregulation. An important possible effect of deregulation may be a reduction in maintenance and in new investments. This paper emphasizes the current strategies and policies made by the Indian government towards deregulation. View full abstract»

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  • A novel design strategy of low-pass FIR filter using Opposition-based Differential Evolution algorithm

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (150 KB) |  | HTML iconHTML  

    Complicated mathematical operations are in the heart of any signal processing application and therefore minimization of computational time is one of the major areas of concern at which the researchers have been looking for years. A number of evolutionary optimization techniques have proved their faithful appearance in various signal processing operations, particularly in the field of digital filter design. However, they often require significantly higher time to converge, thus making the approach unsuitable for applications requiring higher throughput. In this paper, an attempt has been made towards the improvement of the convergence nature of a popularly used optimization technique namely, Differential Evolution (DE) through the use of an alternative approach, called Opposition-based Differential Evolution (ODE), derived from the concept of DE in designing low-pass Finite duration Impulse Response (FIR) filter. Performance comparison between these two distinct techniques has been carried out from different analytical angles. Finally, it has been concluded that ODE outperforms DE in every respect as considered in this work. View full abstract»

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  • Reduction of large scale linear dynamic SISO and MIMO systems using differential evolution optimization algorithm

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (826 KB) |  | HTML iconHTML  

    In this paper, a computationally simple approach is proposed for order reduction of large scale system linear dynamic SISO and MIMO system using differential evolutionary (DE) optimization technique. The method is based on minimizing the integral square error (ISE) between the transient responses of original and reduced order models pertaining to step input. The reduction procedure is simple, efficient and computer oriented. Stability of the reduced order system is always assured in proposed method. The algorithm is illustrated with help of two numerical examples and results are compared with other well known reduction techniques to show its superiority. View full abstract»

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  • Verification of firing angles of static var compensator with alternating current electric arc furnace

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (328 KB) |  | HTML iconHTML  

    Non linear and chaotic loads like alternating current electric arc furnace (AC EAF) lead to power quality issues like poor power factor, harmonic generation etc. Static var compensator (SVC) is perfect solution for mitigating the above mentioned threats to power quality. The SVC behaves like shunt connected variable impedance which either generates or absorbs reactive power in parallel to the AC EAF. This generation and consumption of reactive power is balanced by thyristor controlled reactor by varying the firing angles of thyristors and control the current passing through the reactors. This review presents MATLAB simulation of thyristor controlled reactor with the SVC. This review also verifies firing angles of thyristor controlled reactor of the SVC so that reactive power drawn by AC EAF load at various power stages from the system is almost zero in line with actual field practice for nearly unity power factor operations. View full abstract»

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  • Techniques for adaptive websites and Web personalization without any user effort

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (103 KB) |  | HTML iconHTML  

    Now days it's becoming really difficult to extract the desired information on the World Wide Web. Resources on the WWW are continuously increasing therefore its becoming difficult to find the information that satisfies the individual needs of the user. This is because of Information overload. Web search engine helps users to find out the useful information but mostly search engine give back the same results regardless of who submitted the query. Therefore there is need of such techniques that returns the result according to the users need. This may be referred as Web personalization. In this paper we first describe various techniques for web personalization. Then we try to find out problem associated with these techniques. After that we describe various new techniques to overcome that problem. View full abstract»

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  • Analysis of circular patch antenna as an electromagnetic interference sensor

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (238 KB) |  | HTML iconHTML  

    This paper presents the analysis of circular patch antenna as an electromagnetic interference sensor in microwave frequency range. The paper describes the performance of circular patch antenna as EMI sensor in terms of antenna factor and radiation characteristics. The designed patch antenna is simulated using commercial software Computer Simulation Technology Microwave Studio. The designed patch antenna is fabricated and characteristics are measured. Simulated and experimental results are presented and discussed. Same trend is obtained in the antenna factor of the circular patch antenna calculated from experiment and simulation. View full abstract»

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  • Field programmable gate arrays control based photovoltaic energy management

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (343 KB) |  | HTML iconHTML  

    This paper presents hardware implementation of PV module for photovoltaic (PV) applications by using buck converter, battery, electronic card and FPGA Board. The goal of the project was to control the chopper in order to be able to charge a battery and feed a load with energy from that battery and/or the solar panel, and display all the significant signals. Therefore it was necessary to make a hardware card using current transducers and an algorithm implementation on an FPGA. The control algorithm and coding for integration with the PV cell is proposed by means of the VHDL code and implemented using Xilinx Spartan-3 from Digilent (NEXYS-2) FPGA Board. In this work, a hardware implementation of electronic card interface and open loop control with rotary encoder as a reference input in a PV system has been developed. This has all been done, and the whole project works, including the control of the chopper and displaying the values of the currents and voltages. It is better to control the chopper in closed loop instead of the open loop system that we used. This way it is possible to make sure that the solar panels works in its optimal power point, by using an MPPT. The Developed hardware has the merits of easy programming in VHDL with high accuracy even with low resolution ADC which are utilized in microcontroller and dSPACE. The proposed technique has been described through detailed experimental work. View full abstract»

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  • Knowledge base representation for HIV victims in the world

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (115 KB) |  | HTML iconHTML  

    From the birth of the world a large number people have been suffering fatal life killing disease AIDS for various reason. Actually the problem belongs to the people by the people due to the lack of awareness. One the major problem for HIV victims is that it kills their life span by time being unfortunately. In this research, we focus on linked data of semantic web and to achieve the knowledgebase construction for HIV victims. It is obvious that HIV victims are also part of human being and they have full right to get all the support and facilities from all other human. Earlier we have had put concentration on design the linked data for them. We improve our previous work to achieve efficiency on knowledgebase representation. Manipulating our collected data in a structured way by XML parsing on JAVA platform. Our proposed system generates n-triple by considering parsed data. We proceed on an ontology is constructed by Protege which containing information about names, places, awards. A straightforward approach of this work to make the knowledgebase representation of HIV victims more reliable on the web. Our experiments show the effectiveness of knowledgebase construction. Complete knowledgebase construction of HIV victims show the efficient output. The complete knowledgebase construction helps to integrate the raw data in a structured way. The outcome of our proposed system contains the complete knowledgebase. Our experimental results show the strength of our system by retrieving information from ontology in reliable way. View full abstract»

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  • Study of shaft voltage & bearing currents in electrical machines

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    Shaft voltage & bearing currents in electric motors are not new. Its presence is noticed probably after the invention of electric rotating machines which is confirmed by observing pitting in the bearing rubbing surfaces and changing the chemical composition of lubricating oil or grease used in the bearings. Currents flowing through motor bearings have the potential of creating premature failure of bearings. This paper discusses about the origination of shaft voltage and bearing currents. A few mitigation techniques are also touched upon. View full abstract»

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  • Analysis and impacts of Negative Bias Temperature Instability (NBTI)

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (350 KB) |  | HTML iconHTML  

    As the Integrated Circuits (IC) density keeps on increasing with the scaling of CMOS devices in each successive technology generation, reliability concerns mainly Negative Bias Temperature Instability (NBTI) becomes a major challenge. NBTI degrades the performance of a PMOS transistor under a negative gate stress. The after effects of NBTI include: (a) threshold voltage increase of PMOS transistor, (b) drain current degradation, and (c) speed degradation. Elevated temperature and the negative gate stress play an important role in degradation of Gate Oxide which further degrades the above said parameters. Before any circuit design Stress Analysis becomes important for any device in order to get the complete performance of the circuit. Negative bias temperature instability (NBTI) has become the dominant reliability concern for nanoscale PMOS transistors. In this paper basically we have analysed the effect of temperature variations on NBTI for a buffer. View full abstract»

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  • Design and simulation of a novel micro-mixer along with a dielectrophoresis based focusing mechanism for clinical applications

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (504 KB) |  | HTML iconHTML  

    We report a successful design and simulation of a novel micro-mixer with embedded micro electrodes to produce dielectrophoresis (DEP) force in order to focus particles in the middle of the channel and reduce sedimentation of particles. The device is designed to let cells with diameter of less than 15μm pass and therefore it can be integrated in the micro-scale cell sorters, which should be a key device for clinical applications. First, the concept of micro-mixers and dielectrophoresis phenomena is introduced. Then, design and simulation results of the micromixer and micro electrodes are presented, and evaluation of the mixer performance and focusing mechanism is discussed. View full abstract»

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  • Comparative study between unipolar and bipolar switching scheme with LCL filter for single-phase grid connected inverter system

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (258 KB) |  | HTML iconHTML  

    This paper presents the comparative study between unipolar and bipolar switching scheme for single-phase grid-connected inverter system with filter design on the grid side. For that, LCL filter is considered and its performance for current ripple reduction on grid-side is compared with normal L and LC filter. It is seen that the response for LCL filter show the best results with lower current ripple as compared to L and LC Filter. Further, the obtained results show that the obtained LCL-filter can provide sufficient attenuation of current harmonics and mean while injects a sinusoidal current into the grid for maintaining power quality standard. In addition to that, the method to design the inductor is also included in the paper. The studied system is modeled and simulated in MATLAB Computer simulation environment. View full abstract»

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  • Robust H design with pole placement constraints via static output feedback of T-S fuzzy systems with parametric uncertainties

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (172 KB) |  | HTML iconHTML  

    This paper offers a design procedure for a robust pole-placement problem with H objective via static output feedback control for T-S fuzzy systems with time-varying norm bounded uncertainties. Sufficient conditions for synthesis of a fuzzy static output feedback controller for T-S fuzzy systems are derived in terms of a set of linear matrix inequalities (LMIs). In comparison with the existing robust H fuzzy static output feedback controllers we also employ pole-placement method in order to drive the closed loop poles into a suitable sub-region of the complex plane, and to improve the transient behavior of the system. View full abstract»

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  • Particle Swarm Optimization based Optimal Power Flow for reactive loss minimization

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (375 KB) |  | HTML iconHTML  

    Optimal Power Flow (OPF) problem in electrical power system is consider as a static, non-linear, multi-objective or a single objective optimization problem. As the power industrial companies have been moving in to a more competitive environment, OPF has been used as a tool to define the level of the inter utility power exchange. Basically, this research work provide a new approach to solve the single objective OPF problem considering critical objective function of reactive loss minimization for utility/industrial companies, while satisfying a set of system operating constraints, including constraints dedicated by the electrical network. Particle Swarm Optimization (PSO) has been used for this purpose. Particle Swarm Optimization (PSO) is a population based stochastic optimization technique. The system is initialized with a population of random feasible solutions and searches for optima by updating generations. The IEEE-30 bus system is considered throughout this research work to test the proposed algorithm. View full abstract»

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  • Linear frequency modulation waveform synthesis

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    Pulse compression plays an important role in design of the radar system. Pulse compression using linear frequency modulation techniques are very popular in modern radar. The linear frequency modulation is used to resolve two small targets that are located at long range with very small separation between them. The primary focus of this paper is the time frequency analysis and generation of LFM waveform using Direct Digital Chirp Synthesis (DDCS). This approach has been implemented on a Field Programmable Gate Array (FPGA) for the Synthetic Aperture Radar (SAR) application. View full abstract»

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  • Effect of signal wavelength and aperture area of detector on performance of free space optical link

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (214 KB) |  | HTML iconHTML  

    Bit error rate performance of a FSO link and visibility range are adversely affected by, harsh weather conditions, and atmospheric turbulence like fog, rain, clouds and dry snow. Wavelength of signal and aperture area of optical detector affects quality factor of receiver. This paper presents performance of FSO link with different wavelengths and different aperture area of optical detector. Effects of different wavelengths on visibility range and quality factor of optical receiver have been simulated. For simulation, license versions of OPTSIM 5.2 and MATLAB 6.00 have been used. View full abstract»

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