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http://hdl.handle.net/11375/6661
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DC Field | Value | Language |
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dc.contributor.advisor | Szabados, Barna | en_US |
dc.contributor.author | Brown, Murray Gerald | en_US |
dc.date.accessioned | 2014-06-18T16:36:28Z | - |
dc.date.available | 2014-06-18T16:36:28Z | - |
dc.date.created | 2010-06-10 | en_US |
dc.date.issued | 1989-04 | en_US |
dc.identifier.other | opendissertations/1968 | en_US |
dc.identifier.other | 2933 | en_US |
dc.identifier.other | 1352745 | en_US |
dc.identifier.uri | http://hdl.handle.net/11375/6661 | - |
dc.description.abstract | <p>Variable speed AC drives have become the new standard for high performance drive systems. Very high power traction drives present a particular challenge for AC drive technology because of the simultaneous need for high-torque vibration-free operation at standstill, traction-limited dynamic braking, and high speed operation.</p> <p>In this work, two independently controlled cycloconverters are used with a wound rotor machine to provide a double fed drive system that overcomes the frequency limitations of the cycloconverters and provides a stable high power drive, with potential for rapid torque response and power factor control.</p> <p>A new 'Jitter' control method is derived for the firing angle control of the cycloconverter. This method effectively spreads the cycloconverter output harmonics over a broader spectrum and thus minimizes the filtering requirements.</p> <p>The double fed motor (DFM) equations are applied to the DFM circle diagram and a simulation program has been written to plot the circle diagram and give a geometric interpretation of the developed torque. A new algorithm is proposed using δν, the pseudo torque angle, to give direct control of the torque using only position feed-back. A novel frequency hopping algorithm is also derived that allows the cycloconverters to be operated at high frequencies without generating harmonic torques.</p> <p>A dual cycloconverter drive was built to verify the stability and torque-speed performance of such a system. Reliable operation was achieved by using bank switching sensors based on detecting the reverse bias across a series connected diode, and by short circuit detection circuits with automatic reset facilities. The control software displays system status information on the screen, with on-line parameter modification, and provides a complete range of manual and automatic modes of operation to facilitate system development and testing.</p> | en_US |
dc.subject | Electrical and Electronics | en_US |
dc.subject | Electrical and Electronics | en_US |
dc.title | Application of Dual Cycloconverters to a Double Fed Motor for Traction Drives | en_US |
dc.type | thesis | en_US |
dc.contributor.department | Electrical Engineering | en_US |
dc.description.degree | Doctor of Philosophy (PhD) | en_US |
Appears in Collections: | Open Access Dissertations and Theses |
Files in This Item:
File | Size | Format | |
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fulltext.pdf | 7.28 MB | Adobe PDF | View/Open |
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