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Theses

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2016 - 201932
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Subject: Electrical Engineering × End date: 2019 × Start date: 2016 × Type: Thesis ×
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    ThesisItemOpen Access
    Design and performance investigation of line start permanent magnet synchronous motor
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2019-08) Arvind Kumar; Srivastava, Ajay
    Electric motors are the workhorse of the modern industries and consume about 70 % of the industrial electrical demand. Constructing motors with better efficiency can result in a reduction in energy consumption and cost savings to the consumer. The solution of increasing a motor’s efficiency is to use permanent magnets motors which eliminate the excitation losses experienced by induction machines, thereby increasing the motor’s efficiency. The past 25 years have been a significant period with advances in the development of line start permanent magnet motors. Over this period, these motors have expanded their presence in the industrial and domestic marketplace. LSPMSMs can offer higher efficiency than standard induction motors used in the industry. Due to nonlinear characteristics of magnetic materials, finite element method is considered to be a better approach for design and analysis of line start permanent magnet motors. In order to find the optimized structure, different rotor structures of line start permanent magnet motors are comparatively studied in terms of dynamics and steady state performance. The placement and volume of magnet plays a critical role in motor performance. Three types of rotors with different layers of permanent magnets are proposed and analyzed using finite element method. The performances of three motors are compared to get the best configuration of line start permanent magnet motor.
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    ThesisItemOpen Access
    Investigation of the performance of three phase induction motor under non sinusoidal supply voltages
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2019-09) Kaushik, Deepak; Srivastava, Ajay
    According the electric power research in 1995, 35- 40% of all electric power flow through electronics converters. That used of electronics devices increased year by year. All the electronic converters are the non- linear load and they generate the harmonics. Harmonics affects the power supply, it affects the voltage, current, and frequency of the power supply and power supply become distorted. The distorted power supply affects the performance of all connected devices. Induction motor is mostly used machine in industrial area as well as commercial area. Induction motor performance also affected by the distorted supply, therefore the study about the performance parameter of induction motor like torque, speed, power factor, torque ripple, losses, efficiency etc. under the distorted supply on MATLAM/SIMULINK. SIMULATION give the quick analysis of the performance parameter, under the positive, negative, and mix harmonics to check the performance of motor under different loading condition. At harmonic contain supply under full load condition efficiency and power factor was increasing with decreasing in harmonic voltages. That observation is same for positive, negative and mix harmonics. But the change is very minor in efficiency and power factor. Speed does not vary with harmonics supply. Ripple is constant for all load at different harmonics. Losses increase due to the harmonics contain supply.
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    ThesisItemOpen Access
    Investigation of power quality impact on the performance of three phase induction motor
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2019-08) Singh, Sunil; Srivastava, Ajay
    Voltages are well balanced and sinusoidal at the generation and the transmission levels but it gets unbalanced and non-sinusoidal at the utilization or distribution levels due to unequal system impedances, unequal distribution of single-phase loads, and non-linear loading. Voltage unbalance, under/over voltage, and distorted waveform conditions generally occur simultaneously. An excessive level of voltage unbalance, undervoltage, overvoltage, and harmonics can result excess power loss, torque reduction, and torque pulsation in the induction motors. A comprehensive investigation of impacts of voltage unbalance, undervoltage, overvoltage, and harmonics has been done on the performance (loss, efficiency, currents, current unbalance, power factor, torque, speed, speed pulsation, and torque pulsation) of three phase induction motor using MATLAB/Simulink software. Investigation is done by taking the power quality disturbances separately and simultaneously. Some of the results obtained by simulation is also verified by conducting lab experiment on the similar machine and found good agreement with results. A relation is establish to estimate torque ripple factor (TRF) in terms of voltage unbalance factor and total harmonic distortion (THD). It has been concluded that terminal voltage unbalance (TVU) will not affect slightly, but undervoltage unbalance (UVU) affect the motor performance severely and immediate need to derate. It has been recommended that to derate the motor precisely, under/over voltage or positive sequence voltage should also be taken into consideration. The simulation models can be used for further study and research.
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    ThesisItemOpen Access
    Performance analysis of self-excited induction generator using MATLAB & its experimental verification
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2019-08) Choudhary, Monika; Goel, S.K.
    Self-excited induction generator offers certain advantages over a conventional synchronous generator as a source of isolated power supply. Main advantages are reduced cost, less maintenance, self protection from short-circuit or overload condition. It is used as variable speed generator for different application such as wind energy conversion, micro-hydro power generation. It can be used to generate constant voltage and frequency if the electrical load is maintained constant at its terminals. Under such operations, SEIG requires constant capacitance for excitation resulting in a fixed-point operation. In this thesis, Experimental investigation of Self-Excited Induction Generator has been done in laboratory. Three-phase SEIG model using Matlab simulink has been developed. MATLAB/Simulink software has been used to analyze the behavior of SelfExcited Induction Generator. Simulink result has been obtained using the developed model. Experimental investigation of Self-Excited Induction Generator condition under different loading conditions has been done using four channel digital oscilloscope. Experimental investigation of SEIG has been done in laboratory. The results obtained in laboratory are very much similar to the MATLAB results.
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    ThesisItemOpen Access
    Analysis of excessive unevenness in load curve characteristics due to solar energy incorporation into grid & the possible solution
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2019-08) Bohra, Vijay; Arora, Sudha
    The global average temperature is rising at significant rate, so is our concern towards it. One of the major contributor to rising temperature, is the green house gases emitted from power sector due to its high dependence on conventional sources like coal and petroleum products. Various measures like incorporating renewable energy into system are being taken to reduce the share of conventional (fossil fuel based) plants in the energy sector. Among renewable sources, solar energy has the highest growth rate (24% growth) due to its universal acceptance features like availability of sun on earth surface, ease of maintenance, ease of installation, no moving parts, negligible pollution level etc. But, with high solar incorporation, a major problem which is foreseen for every country is significant dip in power requirements from conventional energy sources, resulting in dip in their load curve during day time which could decrease the efficiency of these conventional plants (mostly thermal plants) and leads to excessive curtailment of energy due to over generation. A need for such a system was felt where energy could be stored (acting load during peak hours) and released (when there is excessive ramp to reduce pressure from thermal power plants). So, the missing link was searched and energy storage system was found to be a possible solution to the above mentioned problems. Among options like pumped hydro storage, compressed air storage, and battery energy storage, battery energy storage system can be best solution because of its wide availability and applicability. Taking all these things into account, the first part of this thesis work deals with analysis of, unevenness in load curve due to solar energy incorporation. For this, load is varied in a way that resembles a typical load curve, on a SIMULINK model of grid-tied PV system, and the percentage share of load met by PV and grid are recorded and analysed. In the second part, a Battery Energy Storage System (BESS) is designed in SIMULINK as the solution to above problem.
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    ThesisItemOpen Access
    Advanced directional relaying schemes for series compensated transmission lines and distribution networks
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2019-07) Bisht, Dinesh Singh; Saxena, Ravi
    In integrated power systems the direction of fault current is not fixed. A reliable, effective and versatile directional relaying is therefore very important. Voltage and current inversion in series compensated lines leads to mal-operation of conventional directional relays. In distribution lines where potential transformer is generally absent, conventional directional relays cannot be used. This thesis presents two modified directional relaying schemes to address these shortcomings. First scheme utilise the phase change in positive sequence current and magnitude change in positive sequence voltage at fault and pre-fault conditions. It is evaluated through MATLAB simulation for a series compensated line and its performance is compared with conventional directional relaying for different type of fault. This proposed scheme addresses the problems of voltage and current inversion faced in conventional directional relaying. The second scheme utilise only the post fault current to estimate the fault direction. Hence, it is an attractive method of directional relaying in distribution networks but equally applicable for transmission lines. Performance of this technique was assessed using simulated models of transmission and distribution lines on MATLAB for different operating conditions; like change in the power flow direction, effect of fault resistance, effect of fault location, level of compensation etc.
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    ThesisItemOpen Access
    Modeling and performance analysis of PV module
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2019-08) Sanjay Kumar; Saxena, Ravi
    Energy production from solar energy sources is accelerating due to increase in oil prices, depletion in fossil fuel reservoir and environment change concern. Solar energy is environment friendly, reliable, clean and most promising energy resource among renewable energy options. Photovoltaic module composed of the series and parallel connected solar cell to meet requisite level of voltage and current at consumer end. Photovoltaic module’s performances are mainly depends on environmental conditions such as irradiance and ambient temperature. The main emphasis of the thesis is to be placed on photovoltaic system, modeling and simulation of PV module. A PV module has been implemented in MATLAB/Simulink environment to predict modeled PV module performance. This thesis discusses the effect of temperature, irradiance level, series resistance and shunt resistance on the performance of modeled PV module.
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    ThesisItemOpen Access
    Modeling, simulation and IoT based real-time monitoring of an electric vehicle
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2019-03) Rohit Kumar; Saxena, Ravi
    Electric vehicles (EV) use electric motors and motor controllers powered by rechargeable battery packs for their propulsion. It offers several advantages over conventional petrol/diesel cars as they have sustainable and cleaner energy emissions in transportation and lower running cost. In the first phase of study, Simulation is performed in LabVIEW and the results are plotted. The torque, power, distance travelled and depth of discharge variations were used to determine the energy flow and performance of EV.SIMULINK based EV Model was to study the performance of the SRM drives for electric vehicles under abnormal conditions such as open and short circuit faults. The speed, torque, fluxes and state of charge (SOC) were usedto analyze the performance of SRM driven electric vehicle. The concept of solar hybrid e-rickshaw is an important step toward sustainable green transportation system. In this work, the E-rickshaw with solar photovoltaic panel is simulated both with single and simultaneous battery packs. Li-ion battery pack shares higher energy density and more SOC decline as compared to lead acid battery pack under dynamic conditions. The results signify the possibility of implementing simultaneous battery packs at reasonable cost price. In this thesis, an IoT based realtime monitoring system is successfully tested, validated and implemented.
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    ThesisItemOpen Access
    Mechanical and thermal characterization of electronic waste modified epoxy
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2018-08) Sagar, Amar; Sah, P.L.
    In the present thesis work experimental investigation to study mechanical and thermal properties of electronic waste modified epoxy has been done. The composite consisting of electronic waste particle reinforced in epoxy was fabricated using hand lay-up technique. Electronic waste plastic powder from television and keyboard cabinet was used as filler with epoxy matrix. The filler was transformed to micro size particles from grinder using grinding operation. Two million tons of electronic wastes are produced in India annually, thus posing an environmental challenge. Therefore, we have tried to utilize this electronic waste in the field of material science. This work reveals the systematic methodology of fabrication and evaluation of diverse properties of the epoxy based electronic waste reinforced composites. After applying the curing process, epoxy resin – electronic waste composites, with varying electronic waste weight percentages (0%, 2.5%, 5%, 10%) were put to investigation. On the basis of mechanical testing results properties like tensile strength, Compressive strength, impact strength and hardness improved. The cured epoxy composite with 5 weight % electronic waste content was confirmed to be the best of all compositions under this scrutiny which was authenticated by the micro-structural and mechanical tests. Thermal testing showed insignificant changes in degradation temperature with 5% weight of filler being slightly stable. It is concluded that optimum results were found at a particular percentage of 5%. Thus properties have significantly improved for the developed composite as compared to pristine epoxy.