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Direct Torque Control of Permanent Magnet Synchronous Machine Using Nonlinear Flux Observer

Yaghoubi, Mokhtar | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41665 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Tahami, Farzad
  7. Abstract:
  8. Direct Torque Control (DTC) is one of the vector methods to control Permanent Magnet Synchronous Machines (PMSM). In order to achieve an appropriate control in vector control methods, an accurate estimation of flux is indispensable. Flux estimation should be fulfilled in a wide speed range without considerable dependence on motor parameters. Prevalent flux estimation methods are based on integration of stator voltage which is not feasible in low speed, or performed based on assumption of decoupled equations on d and q axis which is not precise for applications with fast dynamic. Different flux estimation methods are investigated in this thesis with the aim of improving the flux estimation in fast dynamic applications and solving the low speed problem by design and implementation of a completely nonlinear observer to optimization the operation of DTC system. In this research different integration ways are reviewed and their optimization methods are described. A novel method is proposed based on online stator resistance estimation, engaging nonlinear control and combination with improved integrator, which considerably has solved previous methods problems.The described method is simulated in MATLAB/Simulink and its efficiency results are presented
  9. Keywords:
  10. Permanent Magnet Synchronous Machine ; Direct Torque Control ; Flux Estimation ; Nonlinear Control ; Nonlinear Flux Observer

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