Synchronous machines provide a practical way to control reactive power consumption of a plant. One of the main advantages of using synchronous motors in a plant is their ability to generate reactive power for plant loads. A new control scheme for synchronous motor excitation systems is developed to automate reactive power consumption. The system performs adaptive control based on the real time data and keeps the power factor within a specified range. The system can also be used to improve voltage drop during large induction motor starts. Power system behavior as a result of applying the adaptive control is studied under different operating scenarios using power system analysis software. Results and conclusions are based on mathematical simulation and experimental measurements of a prototype system. / Graduation date: 2003

A Brushless, Doubly Fed Machine (BDFM) attempts to combine the advantages of conventional induction and synchronous types of electrical machines by its unique architecture. The validation of BDFM designs in an actual test environment requires the estimation of the BDFM model parameters from actual experimentation. Accurate values for the parameters are also required by controllers that will be used in the future with specific objectives in mind. This study deals with the design of an estimation scheme to evaluate the parameters for a BDFM, dynamic model. Experimental results are presented. Conventional, practical estimation schemes are based generally on a number of experiments carried out at different operating points, or are limited to estimating a few parameters. The thrust of this work is towards developing a technique that can evaluate all parameters of the BDFM model around the same operating point, and, with limited number of experiments. The parameter estimation scheme is developed with practical implementation in mind. The constraints of the experimental procedure are outlined. The validity of the estimation scheme has been established by tests on a laboratory prototype of the BDFM. / Graduation date: 1995

Thesis (Ph. D.)--Cornell University. / "Reprinted from the Sibley journal of engineering, Oct. 1904." "List of articles dealing with alternating-current phenomena": p. [1] Appendix.

Thesis (M.S.)--Tennessee Technological University, 2008. / Title from title page screen (viewed on Mar. 18, 2010). Bibliography: leaves 361-366.

published_or_final_version / Physics / Doctoral / Doctor of Philosophy

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