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Dissertations / Theses on the topic 'Speed variable'

Author: Grafiati

Published: 8 September 2021

Last updated: 29 July 2025

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1

Stott, Paul Anthony. "Renewable variable speed hybrid system." Thesis, University of Edinburgh, 2010. http://hdl.handle.net/1842/4781.

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At present many remote and Island communities rely solely on diesel powered generators to provide electricity. Diesel fuel is both expensive and polluting and the constant speed operation of the diesel engine is inefficient. In this thesis the use of renewable energy sources to help offset diesel fuel usage and an alternative way of running the diesel generator with the aim of reducing electrical energy costs is investigated. Diesel generators have to be sized to meet peak demand, in one or two diesel generator island grids, these generators will be running at a fraction of maximum output for

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2

Goodfellow, David. "Variable speed operation of wind turbines." Thesis, University of Leicester, 1986. http://hdl.handle.net/2381/7822.

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This work describes a control system in which a cycloconverter is connected between the secondary windings of a three phase induction machine and the a. c. mains supply to give variable speed sub- and super –synchronously. In order to control the system smoothly in an asynchronous mode a secondary emf signal generator has been designed, which enables the cycloconverter to operate in synchronism with the emf induced in the secondary windings of the machine. A computer programme has been written which calculates the required firing angles for the cycloconverter to produce secondary current in ph

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3

Bhargava, Rajat. "Simulation models for variable speed electric drives." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/mq22571.pdf.

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4

Licari, John. "Control of a variable speed wind turbine." Thesis, Cardiff University, 2013. http://orca.cf.ac.uk/46516/.

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Stop signal task of response inhibition, I find that response inhibition (stopping) is slowed in the presence of angry facial expressions, and such slowing is greater in individuals high in trait neuroticism. Further, as predicted, the influence of neuroticism is moderated by individual differences in emotion regulation, such that good emotion regulation ‘buffers’ the impact of neuroticism. The implications of these findings for current cognitive models of threat-processing are discussed.

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5

Maggs, John David. "Electromagnetic interference from variable speed motor drives." Thesis, Aston University, 1996. http://publications.aston.ac.uk/15347/.

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A methodology is presented which can be used to produce the level of electromagnetic interference, in the form of conducted and radiated emissions, from variable speed drives, the drive that was modelled being a Eurotherm 583 drive. The conducted emissions are predicted using an accurate circuit model of the drive and its associated equipment. The circuit model was constructed from a number of different areas, these being: the power electronics of the drive, the line impedance stabilising network used during the experimental work to measure the conducted emissions, a model of an induction moto

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6

Ramtharan, Gnanasambandapillai. "Control of variable speed wind turbine generators." Thesis, University of Manchester, 2008. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.556174.

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7

Stefani, Andrea <1976&gt. "Induction Motor Diagnosis in Variable Speed Drives." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amsdottorato.unibo.it/2311/1/Stefani_Andrea_Tesi.pdf.

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Several diagnostic techniques are presented for the detection of electrical fault in induction motor variable speed drives. These techinques are developed taking into account the impact of the control system on machine variables and non stationary operating conditions.

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8

Stefani, Andrea <1976&gt. "Induction Motor Diagnosis in Variable Speed Drives." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amsdottorato.unibo.it/2311/.

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Several diagnostic techniques are presented for the detection of electrical fault in induction motor variable speed drives. These techinques are developed taking into account the impact of the control system on machine variables and non stationary operating conditions.

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9

Lucky, Adama Brian. "The impacts of variable speed limit on speed variation and headway distribution." Thesis, Queensland University of Technology, 2014. https://eprints.qut.edu.au/72925/2/Adama_Lucky_Thesis.pdf.

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This thesis investigates the impacts of variable speed limit on motorway speed variation and headway distribution. Initiative techniques of traffic flow categorisation study contribute in analysing the effects of variable speed limit on various traffic states. The project focuses on the speed harmonisation impacts within and across lanes as well as the uniformity of headway spread in the application of variable speed limit.

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10

Zhu, Chaoying. "Induction motor speed sensing and control." Thesis, University of Sussex, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358985.

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11

Chuang, Jason C. "Variable Speed Flapping Wing Micro Air Vehicle using a Continuous Variable Transmission Design." Wright State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=wright1401813452.

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12

Larbes, Cherif. "Boost modulation : control of AC variable speed drives." Thesis, Lancaster University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.304281.

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13

賴志強 and Chi-keung Lai. "Dynamic response of a variable speed pumping system." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1994. http://hub.hku.hk/bib/B31212360.

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14

Khan, Hamid. "Optimised space vector modulation for variable speed drives." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2012. http://tel.archives-ouvertes.fr/tel-00999475.

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The dissertation documents research work carried out on Pulse Width Modulation (PWM) strategies for hard switched Voltage Source Inverters (VSI) for variable speed electric drives. This research is aimed at Hybrid Electric Vehicles (HEV). PWM is at the heart of all variable speed electric drives; they have a huge influence on the overall performance of the system and may also help eventually give us an extra degree of freedom in the possibility to rethink the inverter design including the re-dimensioning of the inverter components.HEVs tend to cost more than conventional internal combustion en

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15

Mebarki, A. "Variable speed constant voltage constant frequency generation system." Thesis, University of Bath, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358884.

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16

Lloyd, Simon H. "Variable speed control of a small wind turbine." Thesis, Loughborough University, 1998. https://dspace.lboro.ac.uk/2134/14376.

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An electronic controller has been developed for a wind turbine which uses a passive pitching mechanism and a permanent magnet generator. The turbine rotor is a 3 bladed, down wind horizontal axis design with a diameter of 3.4m. The machine, manufactured by Proven Engineering Ltd., produces 2.2kW at a wind speed of 12m/ s and a rotor speed of 30Orpm. Passive regulation is achieved through a variation of blade pitch controlled by balancing the aerodynamic, centrifugal and spring forces acting on each blade. A production machine has been instrumented and laboratory and field test data collected;

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17

Saad, S. "Efficiency of mining electrical variable speed drive systems." Thesis, University of Nottingham, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381103.

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18

Dridi, Hocine. "Microprocessor control of a DC variable speed drive." Thesis, University of Nottingham, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319962.

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19

Salmon, John C. "A variable speed unipolar induction motor inverter drive." Thesis, Imperial College London, 1987. http://hdl.handle.net/10044/1/46449.

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20

Dadashnialehi, Ehsan. "Modeling And Control of Variable Speed Wind Turbines." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1356372607.

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21

Lai, Chi-keung. "Dynamic response of a variable speed pumping system /." Hong Kong : University of Hong Kong, 1994. http://sunzi.lib.hku.hk/hkuto/record.jsp?B20666305.

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22

Guo, Wei Horn Joseph F. "Flight control design for rotorcraft with variable rotor speed." [University Park, Pa.] : Pennsylvania State University, 2009. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-4647/index.html.

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23

Ling, Jinghong. "A study of variable speed 3-in Knelson concentrator." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0023/NQ50209.pdf.

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24

Okaeme, Nnamdi. "Automated robust control system design for variable speed drives." Thesis, University of Nottingham, 2008. http://eprints.nottingham.ac.uk/10584/.

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Traditional PI controllers have been largely employed for the control of industrial variable speed drives due to the design ease and performance satisfaction they provide but, the problem is that these controllers do not always provide robust performance under variable loads. Existing solutions present themselves as complex control strategies that demand specialist expertise for their implementation. As a direct consequence, these factors have limited their adoption for the industrial control of drives. To counter this trend, the thesis proposes two techniques for robust control system design.

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25

Scheidiger, Michael. "Power System Harmonics Analysis of HighPower Variable Speed Drives." Thesis, KTH, Elektrisk energiomvandling, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-153676.

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Power system harmonics are a topic of significant concern when considering power quality issues in systems containing Variable Speed Drives. The extent to which grid-connected power electronics based motor drives affect power quality is tightly enforced through standards, and must be adhered to. To ensure compliance, harmonic models of Variable Speed Drives and relevant components of the connected power system are evaluated. When necessary, analysis results can be used to aid the design of additional harmonic mitigation measures. Harmonic assessments are most commonly carried out using time-do

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26

Allaith, Noori A. "Intelligent power module for variable speed AC motor drives." Thesis, University of Bristol, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.361134.

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27

Midoun, A. "PWM strategies for microprocessor control of variable speed drives." Thesis, University of Bristol, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.232790.

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28

Wheeler, Patrick W. "A matrix converter for variable speed AC motor drives." Thesis, University of Bristol, 1993. http://hdl.handle.net/1983/1eec4275-808a-4125-813b-4f6e00881f44.

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29

Zahir, Bashir Ahmad. "A variable-speed constant-frequency self-excited induction generator." Thesis, Loughborough University, 2005. https://dspace.lboro.ac.uk/2134/35068.

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The thesis describes the design and development of a stand-alone variable-speed constant-frequency self-excited induction generator, using field-oriented control techniques to provide the necessary voltage and frequency control. Open- and closed-loop models are developed for the generator using tensor techniques and these are subsequently used in the control system design and simulation. For the closed-loop system, both conventional and field-oriented control strategies are developed. A laboratory-scale system was designed and built, to illustrate the system performance. The generator is drive

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30

Haleem, Kirolos Maged. "EXPLORING THE POTENTIAL OF COMBINING RAMP METERING AND VARIABLE SPEED LIMIT STRATEGIES FOR ALLEVIATING REAL-TIME CRASH RISK ON URBAN FREEWAYS." Master's thesis, University of Central Florida, 2007. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3059.

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Research recently conducted at the University of Central Florida involving crashes on Interstate-4 in Orlando, Florida has led to the creation of new statistical and neural networks models that are capable of determining the crash risk on the freeway (Abdel-Aty et al., 2004; 2005, Pande and Abdel-Aty, 2006). These models are able to calculate rear-end and lane-change crash risks along the freeway in real-time through the use of static information at various locations along the freeway as well as real-time traffic data obtained by loop detectors. Since these models use real-time traffic data, t

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31

Refoufi, L. "Steady state analysis of the chopper controlled static Kramer drive." Thesis, University of Newcastle Upon Tyne, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239814.

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32

Lewin, Paul Leonard. "Microprocessor control of a switched reluctance motor." Thesis, University of Southampton, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.262359.

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33

Clark, Paul R. "Optimum PWM strategies for microprocessor controlled three phase inverters." Thesis, University of Bristol, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357755.

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34

Iqbal, Muhammad Tariq. "Dynamic control strategies for fixed and variable speed wind turbines." Thesis, Imperial College London, 1994. http://hdl.handle.net/10044/1/7737.

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35

Ling, Jinghong 1948. "A study of a variable speed 3-in Knelson concentrator /." Thesis, McGill University, 1998. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=35468.

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The distribution of fluidization flow of a variable speed 3-in (7.5 cm) Knelson centrifugal concentrator was first studied. Its performance was then investigated for different types of synthetic ores, and the effect of rotation speed, fluidizing water, gangue density and size distribution, and feed rate determined. To obtain some fundamental information relative to the recovery mechanisms of the Knelson Concentrator, the percolation or migration of dense particles in a gangue bed was investigated in the gravitational field, using a fluidization column. The equations for determining the instant

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36

Zhang, Yongzheng. "Doubly-fed induction machine for variable speed energy conversion applications." Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=114286.

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After decades of development, the wind energy industry is now supplying 10 to 20% of power in electric utilities. At present Doubly-Fed Induction Generators (DFIG) are one of the most widely used generators in wind farms. The research of this thesis advances the methods of controlling DFIGs by presenting: (i)a non-mechanical (sensorless) method of determining accurate rotor speed and rotor position which are essential in implementing decoupled P-Q control; (ii)a method of autonomous frequency control whereby an islanded wind farm does not have to shut down but continues to operate as standby

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37

Aaslid, Per. "Modelling of variable speed centrifugal compressors for anti-surge control." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for teknisk kybernetikk, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-24838.

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A mathematical model for simulation of gas compressor systems is developed. The model is designed for anti-surge control validation, and models a continuous flow gas compressor. The model also includes a cooler for gas cooling, a scrubber for liquid draining, and a recycle line with a control valve for anti-surge control. The system outlet has a check valve to prevent reversed flows. The model is one-dimensional and models pressure, temperature and mass flow for all system components, and also compressor shaft speed. It is modular and derived using mass, momentum and energy balance. Compressor

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38

Benidir, Mohamed. "A study of variable speed drives for the mining industry." Thesis, University of Nottingham, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.254427.

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39

Wheeler, Jeremy Nicholas. "Back-to-back converters for variable speed motor drive applications." Thesis, University of Bristol, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294550.

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40

Willkomm, Johannes, Matthias Wahler, and Jürgen Weber. "Potentials of Speed and Displacement Variable Pumps in Hydraulic Applications." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-200237.

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Speed and displacement variable pumps offer a degree of freedom for process control. As a certain operation point can be supplied by different combinations of drive speed and pump displacement intelligent control strategies can address major issues like energy efficiency, process dynamics and noise level in industrial applications. This paper will provide an overview of recent research and development activities to evaluate the named potentials.

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41

Chikwanda, Herbert Simbarashe. "The naturally commutated, converter-fed, variable speed induction machine drive." Thesis, Imperial College London, 1990. http://hdl.handle.net/10044/1/47805.

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42

Lee, Jae Ryong. "Microprocessor-based soft variable structure control for D.C. motor speed regulation." Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/50045.

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The theory of soft variable structure control, which produces robustness to parameter variation and fast transient response, is discussed in this thesis. The digital implementation techniques are presented in the aspects of sample rate, prefilter design, hardware selection, and microprocessor arithmetic operation. Simulation and experimental results showed good performance in negative speed range, but this controller created unwanted high armature current fluctuation in positive speed range. The reasons turned out to be the limitation of sample rate, noise from the tachometer, and high gain

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43

Rouaud, Didier G. "Harmonic mitigation using a modified slip energy recovery system." Diss., Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/14806.

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44

Dinu, Andrei. "FPGA neural controller for three-phase sensorless induction motor drive systems." Thesis, De Montfort University, 2000. http://hdl.handle.net/2086/4132.

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45

Faiz, J. "Computational methods for the design of multi-tooth-per-pole switched reluctance motors." Thesis, University of Newcastle Upon Tyne, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383963.

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46

Anderson, John A. "Designing and modeling a torque and speed control transmission (TSCT)." Morgantown, W. Va. : [West Virginia University Libraries], 1999. http://etd.wvu.edu/templates/showETD.cfm?recnum=1194.

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Thesis (M.S.)--West Virginia University, 1999.<br>Title from document title page. Document formatted into pages; contains viii, 69 p. : ill. Includes abstract. Includes bibliographical references (p. 68-69).

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47

Serna, Calvo Eva Teresa. "Diagnostics of rotor asymmetries in inverter fed, variable speed induction machines." Berlin Logos-Verl, 2009. http://d-nb.info/99519422X/04.

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48

Yoon, Hyungjoo. "Spacecraft Attitude and Power Control Using Variable Speed Control Moment Gyros." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4850.

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A Variable Speed Control Moment Gyro (VSCMG) is a recently introduced actuator for spacecraft attitude control. As its name implies, a VSCMG is essentially a single-gimbal control moment gyro (CMG) with a flywheel allowed to have variable spin speed. Thanks to its extra degrees of freedom, a VSCMGs cluster can be used to achieve additional objectives, such as power tracking and/or singularity avoidance, as well as attitude control. In this thesis, control laws for an integrated power/attitude control system (IPACS) for a satellite using VSCMGs are introduced. The power tracking objective is a

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49

Qu, Zhen, and Ivan B. Djordjevic. "High-speed continuous-variable quantum key distribution over atmospheric turbulent channels." SPIE-INT SOC OPTICAL ENGINEERING, 2017. http://hdl.handle.net/10150/626486.

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We experimentally demonstrate a RF-assisted four-state continuous-variable quantum key distribution (CV-QKD) system in the presence of turbulence. The atmospheric turbulence channel is emulated by two spatial light modulators (SLMs) on which two randomly generated azimuthal phase patterns are recorded yielding Andrews' azimuthal phase spectrum. Frequency and phase locking are not required in our system thanks to the proposed digital phase noise cancellation (PNC) stage. Besides, the transmittance fluctuation can be monitored accurately by the DC level in this PNC stage, which is free of post-p

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50

Patel, Sagarkumar. "Speed Control of Three-Phase Induction Motor Using Variable Frequency Drive." Thesis, California State University, Long Beach, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10690223.

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<p>There are various methods for speed control of induction motors. This paper specifically describes one of the methods: speed control using variable frequency. The proposed system is a MATLAB simulink model, which is a closed loop model designed to achieve desired speed control of a three-phase induction motor by varying its frequency. The simulink model has four main blocks, namely the inverter, synchronous machine, proportional integral control and current hysteresis control. For accuracy of output results and simplicity, we have used dq to abc transformation block and sin function block.

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