A motor drive consisting of two parallel voltage-sourced converters was developed and
implemented. A parallel converter arrangement allows the system to be constructed in a
modular fashion to gain economies of scale and redundancy. The converters are connected
to common ac- and dc-buses without isolation and are controlled without inter-converter
communication or a master/slave arrangement. The system was simulated and the results
validated against an experimental setup. Both steady-state and dynamic load sharing
were achieved through the use of drooped PI speed regulators. PI controllers were used
to regulate the quadrature currents provided by each converter. Circulating 0-sequence
current was regulated using P controllers. A linearized state-space model of the system
was developed and an eigenvalue analysis was performed, showing system stability. Speed
steps in simulation and in the laboratory demonstrated good response. The loss of one
converter’s gating was emulated. The system continued to operate, showing an advantage
of system redundancy.
| Identifer | oai:union.ndltd.org:TORONTO/oai:tspace.library.utoronto.ca:1807/18295 |
| Date | 18 January 2010 |
| Creators | Fingas, William Daniel |
| Contributors | Lehn, Peter W. |
| Source Sets | University of Toronto |
| Language | en_ca |
| Detected Language | English |
| Type | Thesis |
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