Design and control of a high-efficiency Doubly-Fed Brushless machine for wind power generator application

Abstract

Principles and latest progress of Doubly Fed Brushless Machine (DFBM) are reviewed with the identified solutions to designing a high efficiency DFBM of 96%. The original design of DFBM rated at 200kw/1200rpm focuses on the key components of DFBM, including the rotor style and pole number combination, and control algorithms. Both theoretical and experimental results are presented to substantiate the success of the original design solutions.Keywords-doubly fed, brushless, high efficiency, decouple control of active and reactive power, wind power generator

The state of the art of wind energy conversion systems and technologies: A review

“…The rotor configuration of the BDFIGs can be divided into special cage type and reluctance type [63,64]. According to the rotor bar connection rules the special cage rotor type can be classified into two kinds, independent concentric cage type and independent concentric cage with a public end-ring type.…”

Electrical machines and power‐electronic systems for high‐power wind energy generation applications

“…The basic idea of BLDFIG can date back to 1902 (Siemens Brothers & Co. Ltd and Lydall, 1902) and has experienced three major development stages (Xu et al, 2010), which can be outlined as follows:…”

“…Nevertheless, recent advances in the study of the BLDFIG allow more complete consideration on the application of this machine to variable-speed generation in wind turbines, but clearly reveal a series of fundamental issues and challenges with respects to the design and control of a BLDFIG. Compared to its counterpart DFIG with brushes and slip rings, the issues of BLDFIG to the researchers are fundamental and critical, including (Xu et al, 2010):…”

“…More recently, an original design of a BLDFIG system was achieved by Xu et al (2010) via finite element analysis, which is capable of 2,000 Nm in the speed range of 400-1,200 rpm with a frame size comparable to that of a conventional DFIG. It is worth pointing out that the most impressive results comprise the BLDFIG power capability more than a quarter over the designed value and energy efficiency higher than 94 percent covering 75 percent designed torque-speed regime.…”

Optimized Power Error Comparison Strategy for Direct Power Control of the Open-Winding Brushless Doubly Fed Wind Power Generator

“…Due to its cage-less structure makes the BDFRG, entail somewhat higher efficiency [8], [9], fewer parameter dependencies, simpler to model and easier to control than brushless doubly-fed induction generator (BDFIG) with a complicated wound (or 'nested' cage) rotor [10]. Furthermore, the relationship between the real and reactive power control in the power winding [11] are inherently decoupled in a similar manner to DFIG [12], [13], but not for the BDFIG counterpart [14].…”