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Fast Calculation of Field Currents and Reactances for Doubly Fed Generators With Rotor Duct Pieces

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5 Author(s)
Shima, K. ; Kanazawa Inst. of Technol., Ishikawa ; Ide, K. ; Takahashi, M. ; Okada, M.
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Doubly fed generators have been used as adjustable-speed pumped-storage generator motors and wind turbine generators. Accurate determination of field currents and reactances is important for the design of these machines. We propose a calculation method to obtain the field currents and reactances of machines with rotor duct pieces under any steady-state balanced load condition. The method links two-dimensional static finite-element analysis (FEA) with an approximate calculation to consider three-dimensional (3-D) skin effect in the duct pieces. Its advantage is that the computational time is much smaller than 3-D transient FEA when the slip frequency is not zero. The method will contribute to improvement of the design of doubly fed generators with rotor duct pieces. It was applied to a 395 MVA machine, and the calculated field currents agreed well with the measurements. Variation in the reactances due to saturation is also discussed

Published in:

Magnetics, IEEE Transactions on  (Volume:42 ,  Issue: 11 )

Date of Publication:

Nov. 2006

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