This paper discusses the inverter ratings of BrushIt can be shown (Appendix A) that for an ideal BDFM less Doubly-Fed Machine (BDFM) adjustable speed drive (ASD) operating at constant torque the control winding rating, S2, is or generator (ASG) systems. Based on the per phase equivalent related to the machine rating, Smn, by circuit model, the ratings of the two inverters in a bidirectional converter are evaluated individually. An approach to minimise the total inverter rating is presented, taking into account power = 2 factor constraints of the power grid. The effects of speed S m-f2 7-3 deviation and control winding excitation on the inverter ratings I i 3 are discussed. Predictions of inverter ratings are presented with Equation (3) has been conventionally used to determnine the experimental verification. A design example is also provided in covreraig3] 4.Hwe,asaeulofteeiwhich the total inverter rating is minimised for a practical BDFM tacnerte ragntiing [3],u[].aHoevras an resulkoate rnutnesis-a based ASG system. tne,mgeiigidcacsadlaaeidcacsi Index Terms-BDFM, inverter rating, ASD, ASG practical BDFM, calculations based on an ideal BDFM need to be modified for a full evaluation of the converter rating.
The paper presents the design and performance analysis of a 6 MW medium-speed Brushless Doubly-Fed Induction Generation (Brushless DFIG) for a wind turbine drivetrain. Two machines with different frame sizes have been designed to show the flexibility of the design procedure. The mediumspeed Brushless DFIG in combination with a two stage gearbox offers a low-cost, low-maintenance and reliable drivetrain for wind turbine applications.
Details of a lumped parameter thermal model for studying thermal aspects of the frame size 180 nested loop rotor BDFM at the University of Cambridge are presented. Predictions of the model are verified against measured end winding and rotor bar temperatures that were measured with the machine excited from a DC source. The model is used to assess the thermal coupling between the stator windings and rotor heating. The thermal coupling between the stator windings is assessed by studying the difference of the steady state temperatures of the two stator end windings for different excitations. The rotor heating is assessed by studying the temperatures of regions of interest for different excitations.
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