Design and performance analysis of a 700‐kW wound‐rotor BDFIG for ship shaft generator application

Abstract

In this paper, a 700‐kW brushless doubly fed induction generator (BDFIG) is designed for stand‐alone ship shaft generator application. Based on the principle of tooth harmonics and sinusoidal winding structure, a multi‐pitch unequal‐turn‐coil wound rotor is adopted to reduce harmonic contents and couple the two stator windings effectively. The performance analyses of a prototype BDFIG with two/four pole pairs are presented. The magnetic fields, air‐gap flux densities, and current densities with full load at different shaft speeds of the prototype machine are investigated. Simulation analysis and experimental tests verify that the output capability and the efficiency of the prototype machine could meet the design requirements of a 700‐kW generator and that the wound rotor structure is suitable for high‐power brushless doubly fed machines. © 2015 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

A dual-stator brushless doubly-fed generator for wind power application

“…Meanwhile, the BDFMs are suitable for slow running because the number of electric machine pole-pairs is about two times greater than traditional doubly-fed induction machines (DFIMs) under the same armature diameter in [14,15]. Therefore, the BDFMs have attracted a lot of attention in various areas, for instance, the wind power generator in [16], pump in [17], ship in [18], rotary transformer in [19], and electric vehicle [20]. However, the prominent problem of BDFMs is low torque density in [21].…”