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Title: Modeling and Simulation of Synchronous Motor with Emphasis on Aspects of Stability
Researcher: SUNIL THOMAS
Guide(s): Adhir Baran Chattopadhyay
Keywords: Modeling and Simulation, Synchronous Motor, Stability
University: Birla Institute of Technology and Science
Completed Date: 
Abstract: Steady state stability criteria of A.C. drives play a dominant role for making the drive system practically successful. Generally such analysis is done using small perturbation model, but the complexity of the mathematical formulation depends on the nature of the drive system used. This thesis, at the first stage presents a detailed analysis of steady state stability criterion based on small perturbation model of a current source inverter fed synchronous motor drive system taking direct-axis and quadrature-axis damper winding into account using generalized theory of electrical machines. The modeling also clearly shows that even at no load the system satisfies steady state stability criterion. Routh-Herwitz criterion is used to finalize the result. The methodology of the proposed research work can be stated as follows: The synchronous motor has been treated as a five coil primitive machine model using the concept of generalized theory of electrical machines. Using the concept of Park s transformation, the armature current in d-q model has been represented by suitable equations as a function of armature current magnitude in phase model (Is) and the field angle (and#946;).As the system under consideration is basically a current source inverter fed system, Is has been considered as a constant and as a consequence the field angle (and#946;) finally appears as a control variable. Furthermore voltage balance equations of the five coils have been expressed in time domain and those equations has been transformed accordingly after applying Laplace Transform technique. As the analysis is focusing on the steady state stability criteria, the author feels that small perturbation technique will be appropriate to apply on the transformed equations. Finally the transfer function and#916;and#946;(s)/and#916;TL(s) have been formulated; where and#916;and#946;(s) and and#916;TL(s) represent small change in transformed field angle load torque respectively. The analysis concludes that the absence of damper winding leads to instability of the machine system. newlineiii newlineAs synchronous motor has no i
Pagination: 1.62 MB
Appears in Departments:Electrical & Electronics Engineering

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