Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 24 for “"Variable Speed Drive"”.
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Induction motor variable speed drive performance and impact on energy savings
… under or overvoltages on induction machines (1M) variable speed drives. In addition the performance with PWM inverters connected to 1M via long cables is also studied. The project starts by an evaluation of previous work on the subject and related topics. Relevant conclusions are made based on the …
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A single three phase variable speed drive with unity power factor
… new proposed topology for a single three-phase variable speed drive was developed after considering the advantages and disadvantages of previous topologies. The new topology employs only six switches that form and active front-end rectifier and a four-switch inverter. The active front-end …
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Effects of Input Power Factor Correction on Variable Speed Drive Systems
The use of variable speed drive (VSD) systems in the appliance industry is growing due to emerging high volume of fractional horsepower VSD applications. Almost all of the appliance VSDs have no input power factor correction (PFC) circuits. This results in harmonic pollution of the utility supply …
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3-Phase gate-turn off thyristor inverter
… of a standard 3-phase Induction Motor driven by a Voltage Source Inverter (VSI) are studied. A full 3-phase Variable Speed Drive (VSD) and its controller have been designed, constructed and tested. Gate Turn-Off Thyristors (GTO's) are used as the main switching elements in the Inverter …
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Design of a PC based Data Acquistion System for a Switched Reluctance Motor
… have gained considerable attention in the variable speed drive market mainly due to the simple construction of the motor and the possibility of developing low cost converters and controllers. As these machines are under development, a considerable amount of research effort is directed to …
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The application of advanced signal processing techniques to the condition monitoring of electrical machine drive systems
… to condition monitoring of electrical machine drive systems. The mathematical and signal processing tools which are explored are wavelet analysis and a non-stationary adaptive signal processing algorithm. Four specific applications are identified for the research. These applications were …
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Economic comparison of the constant and variable speed motor-driven boiler feed pumps in today's steam electric power station
… plants, the power consumption of the motor-driven boiler feed pumps has been rising along with the increase of operating pressures and capacities. Power savings thus becomes a more significant factor than ever in selection of boiler feed pumping arrangement. Therefore, use of a more …
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Simulation of a power station's condensate pumping system in view of improving its efficiency
… retrofitting of this flow control mechanism with variable speed flow control; but as different applications have different requirements, a need was identified to develop a systematic approach that would assist in determining the feasibility of a variable speed drive (VSD) retrofit. In order to …
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Implementation of power electronics in nuclear power plants: DC electrical system conceptual design and its financial analysis
… mostly, the more efficient pumping control with Variable Speed Drive. Other design options such as systems with less PE device implementation are examined in this study, which shows similar result. Besides, the technological benefit and challenge is discussed along with possible application to …
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Computer aided design of protection systems for electrical drives
… applied to the protection systems of electrical drives, removing much of the repetitive procedures presently used in determining relay settings. To further this aim, a series of algorithms have been devised which allow exploitation of the concept. The areas chosen for demonstration are, …
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A DSP based variable-speed induction motor drive for a revolving stage
Variable speed drive technology has advanced dramatically in the last 10 years with the advent of new power devices. In this study, a three phase induction motor drive using Insulated Gate Bipolar Transistors (IGBT) at the inverter power stage is introduced to implement speed and position control …
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IMPACT OF HVDC INVERTER STATION FAULTS ON TURBINE-GENERATOR SHAFT TORSIONAL TORQUES
… staticvar compensators, HVDC systems, high-speed governor controls and variable speed drive converters. In most of the reported studies concerned with the interaction of HVDC systems with turbine-generator shafts, attention has been focused on the effect of the HVDC controllers on this …
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Electric load information system based on non-intrusive power monitoring
… without load events. The power consumed by a variable speed drive is also estimated using the correlations between the fundamental powers and higher harmonic powers. The harmonic signal generated by the imbalance of a rotating machine is estimated to monitor the drive, i.e. its speed and …
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Advanced nonintrusive load monitoring system
… the in the presence of loads with a continuously variable power demand. Two new techniques have been developed for automatically disaggregating, in real-time. different classes of continuously variable power electronic loads which draw distorted line currents. Experimental results of the proposed …
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The transputer control of induction motor drives
The inherent advantages of the induction motor in variable speed drive applications can now be realised in a cost-effective manner as a result of recent advances in power electronics and microelectronics. This thesis is devoted to the advancement of the use of induction motors in variable speed …
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Improvements in direct torque control of induction motors
… control of the electrical motor by means of a variable speed drive incorporating sophisticated control strategies. Besides the expectations that have to be met concerning the motion control, other aspects such as efficiency, reliability, generation of electromagnetic pollution, etc. have become …
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Impact of pulse width modulation schemes In eccentricity fault detection using current signature analysis
… on the modulation scheme employed in inverter-driven setup is underexplored. This thesis addresses this gap by analyzing the impact of Sinusoidal Pulse Width Modulation (SPWM) and Selective Harmonic Elimination (SHE) on diagnosing eccentricity faults in three-phase synchronous motor drives. The …
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Torque Controlled Drive for Permanent Magnet Direct Current Brushless Motors
… the design and implementation of a simple variable speed drive (VSD) based on a brushless direct current (BLDC) machine and discrete logic circuits. A practical VSD was built, capable of operating a BLDC machine in two quadrants, motoring and regenerative braking. The intended applications …
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Combustion of lignin-oil-water mixtures in a rotary kiln
… flow rate of lignin-oil-water to the kiln by a variable speed drive. A double pipe heat exchanger was installed to keep the mixture temperature at about 30°C at steady state. Lignin-oil-water mixture was fed to the kiln via a nozzle inserted concentrically through a modified North America, Model …
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The effect of energy input on flotation kinetics in an oscillating grid flotation cell
… particle size have been recognized as important variables affecting particle-bubble contacting in turbulent systems and are investigated in this thesis. The research work done in this thesis is a continuation of the work done by the Centre for Minerals Research by Deglon (1998) who investigated …
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