Analysis and simulation of a variable speed induction motor Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/sj1395620

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  • A model of a squirrel cage induction machine, d.c.- link power supply and centrifugal pump is developed and used in the design and evaluation of a perturbation feedback control system for a sewage pumping station. A comparison of the simulation model of the induction machine and a laboratory machine to a sinusoidal supply voltage is presented. The control system gains are determined using the steady state solution of the discrete Ricatti equation developed in linear quadratic optimal control theory. A simulation of the system is developed and used to demonstrate the open loop starting characteristic of the system, evaluate the convergence properties of the gain calculations and demonstrate the stability of the resulting feedback controller. Open and closed loop system pole placement is evaluated using transform methods. Simulation results show that the gain calculations converge in five iterations on the first sample instant of closed loop operation, and subsequently converge in one iteration and that the closed loop system is stable. Evaluation of the closed loop system pole placement also indicates stability of the perturbation controller.
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  • File scanned at 300 ppi (Monochrome) using ScandAll PRO 1.8.1 on a Fi-6670 in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
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