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Optimal Design and Control of Brushless Doubly Fed Machines

Jandaghi, Behzad | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42145 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Oraee Mirzamani, Hashem; Barati, Farhad
  7. Abstract:
  8. Doubly fed machines require lower converter rating in comparison to single fed machines, and this is the most important advantage of doubly fed machines. Among them, Brushless Doubly Fed Machines (BDFMs) have some advantages, including higher reliability and longer maintenance period. Determination of the converter rating is an important issue that has been not sufficiently investigated. Determination of the minimum converter rating, or in other words, converter current and voltage, in order to minimize the cost to commercialize the BDFM is mandatory. In this thesis, the problem is presented properly, and the optimal voltage and current of each machine side and grid side converters are determined for D-180 prototype BDFM. To do so, the total of machine side and grid side converter current is considered as a criterion for converter cost and with the presented methods, 38.4% reduction in the current has been achieved. In addition, the optimal power winding reactive power, DC link voltage, and grid side converter reactive power references are to be determined to apply on the control system for appropriate machine operation. To do so, two objective functions have been considered, i.e. the converter rating, that can be minimized by optimal reactive power flow, and the output active power or machine efficiency, that needs to be maximized. It is shown that in the majority of the machine operation range (speed range and torque) the maximum machine output can be achieved with the minimum converter cost. Furthermore, it is shown that the converter cost can be minimized further up to 30% by optimal stator windings design
  9. Keywords:
  10. Optimal Reactive Power Planning ; Brushless Doubly Fed Machine (BDFM) ; Converter Rating ; Machine Side Converter ; Gridside Converter ; Per Phase Equivalent Circuit

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