Design and Performance Comparisons of Brushless Doubly-Fed Generators with Different Rotor Structures

Fengge Zhang, Siyang Yu, Yutao Wang, Shi Jin, Milutin G. Jovanovic

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)
55 Downloads (Pure)

Abstract

The Brushless Doubly-Fed Generator (BDFG) shows the great potential for use in large variable speed wind turbines due to its high reliability and cost benefits of a partially-rated power electronics converter. However, it suffers from the compromised efficiency and power factor in comparison with conventional doubly fed induction or synchronous generators. Therefore, optimizing the BDFG, especially the rotor, is necessary for enhancing its torque density and market competitiveness. In this paper, a novel cage-assisted magnetic barrier rotor, called the hybrid rotor, is proposed and analyzed. The detailed analytical design approaches based on the magnetic field modulation theory are investigated. In addition, the machine losses and mutual inductance values using the proposed rotor designs are calculated and their performance implications evaluated. Finally, the comparative experimental results for two BDFG prototypes are presented to verify the accuracy and effectiveness of the theoretical studies.
Original languageEnglish
Article number8305663
Pages (from-to)631-640
JournalIEEE Transactions on Industrial Electronics
Volume66
Issue number1
Early online date1 Mar 2018
DOIs
Publication statusPublished - Jan 2019

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