Graduate Thesis Or Dissertation
 

System optimization studies related to stator design and AC/AC converter selection for brushless doubly-fed machines

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  • The advent of superior power semiconductor devices and converter topologies has renewed interest in ac drive systems. Although considerable research efforts have gone into improving power electronic converter devices and topologies, very little has been reported on the overall performance optimization of induction machine drive systems. The report of the research work presented in this thesis is an endeavor in that direction where enhancement in the system performance is achieved through optimization of the overall system. The Brushless Doubly-Fed Machine (BDFM) can reduce the drive system cost and also retain the robustness of a cage rotor induction machine. Proof-of-concept prototypes have been used in the laboratory for investigation of BDFM operating modes. These prototypes, though providing insight into the operation of the BDFM were far from optimum. Thus, design procedures for optimizing the machine design needed to be developed. The optimized machine can then be integrated into an optimized system by using a realistic, application-dependent converter selection scheme. As mentioned earlier, recent developments in power semiconductor and converter technologies have led to a proliferation of circuit topologies and their modifications with sometimes contradictory performance claims. Consequently, for the non-specialist application engineer designing the BDFM system, this can often lead to uncertainty which potentially can result in non-optimum converter selection. An extensive and comprehensive literature review of presently available converter topologies is presented with a detailed comparative evaluation. Converter selection criteria, as applied to the BDFM, are also discussed in detail. These provide sufficient guidelines for selecting an optimum technology for a given application. Stator design optimization, as discussed in this thesis uses a design parameter search algorithm and the BDFM steady state d-q model. Projected performance of an optimized stator BDFM design is compared with simulation results of present and past laboratory machines. An optimized design with good overall performance is presented. It is also shown that this optimization scheme lowers the power rating requirement of the converter. Thus, for a given rotor structure and its parameters, the converter comparison and selection scheme for BDFM applications along with the optimization scheme for the stator design can lead to an overall optimized system with stator losses, reduced power converter rating and thus lower the initial investment and operational costs.
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