Abstract
Research interest on brushless doubly fed induction machines (BDFMs) is increasing, as they offer higher reliability compared to doubly fed induction generators (DFIGs) in wind turbines. At the moment, BDFMs do not have a definitive structure nor design process, as literature is rife with different approaches to designing BDFMs. In this paper, a comprehensive review of the design of BDFMs from available literature is conducted. The evolution of cascade induction machine systems to contemporary BDFMs is first illustrated. Pioneering research work in the evolution which have influences on modern BDFM designs are highlighted. Relevant research on different aspects of present day BDFM design are then discussed. BDFM design and optimization methodologies applied in available literature are also explored.
Highlights
The p1 /p2 = 2/4 pole pair combination is used for a 250 kW brushless doubly fed induction machines (BDFMs) prototype in [37], the results in [36] suggest that the p1 /p2 = 4/6 combination is more suitable in terms of power, efficiency and torque ripple
In [44,45], the nested loops (NL) and cage+NL rotors are compared based on their rotor equivalent circuit parameters, and it is suggested that the cage+NL rotors provide better performance due to their lower impedances
Available BDFM electric equivalent circuit (EEC) models are limited in evaluating saturation, and Finite element analysis (FEA) models are computationally costly
Summary
Fed induction generators (DFIGs) are the most widely employed generators in medium and large wind turbines. This is due to their low cost, variable speed operations, and the use of fractionally rated converters in their setup [1]. Brushless doubly fed machines (BDFMs) have similar advantages with DFIGs, and the absence of slip ring and brush assemblies in their setup increases their reliability [4]. A thematic review of published literature considering the design of contemporary BDFMs is presented. A comprehensive run-down of recent developments and approaches employed in the design of BDFMs, are presented
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