Design of the brushless DFIG for optimal inverter rating

This presentation describes an optimisation method for the converter rating for a brushless doubly-fed induction generator (DFIG) wind turbine, considering the grid’s requirements on reactive power and low-voltage ride-through (LVRT) compatibility. Steady-state and transient models of the machine have been utilised for the reactive power management and LVRT analyses. The effects of machine parameters on the inverter rating are discussed, and a method of adjusting the leakage and magnetising parameters by an appropriate design of stator slot magnetic wedges is proposed. The analyses have been preformed on a prototype D400-frame 250-kW brushless DFIG.