Abstract
The brushless doubly-fed generator (BDFG) is a kind of dual-electrical-port field-modulated electrical machine containing two sets of stator windings with different pole pairs. The stator power winding undertakes most of the power inflow and outflow, and the stator control winding connected to the power converter can be utilized to regulate the machine operation status. Consequently, the rotor no longer needs to be supplied by the power converter, so that the brushes and slip rings can be removed. The BDFG can be used for grid-connected power generation as well as standalone power generation. This paper reviews recent advances of control technologies for BDFGs under different operation conditions, e.g., grid-connected ac power generation with normal and faulty grids, standalone ac power generation with normal and special loads, and dc power generation. The progresses of sensorless control technologies for BDFG-based power generation systems are also discussed. The classification and comparison are carried out to discover the similarities and differences between theses control technologies. This paper is in the hope of inspiring new, ground breakings and progresses for high-performance BDFG power generator applications.
Highlights
The high reliability structure gives the superiority to the brushless doubly-fed generator (BDFG) in the adjustable drive systems
Unlike the conventional doubly-fed induction generator (DFIG), the rotor of the BDFG no longer needs to be supplied by the power converter, so that the brushes and slip rings associated with the rotor can be removed [2]
In the most severe case, where the BDFIG rotor speed is 100% of the maximum rotor speed and under 100% symmetrical voltage dips, the experimental results have shown that the control winding (CW) current peak could be limited to 2 p.u. of the CW current rating and the torque ripple be small during the fault
Summary
The high reliability structure gives the superiority to the brushless doubly-fed generator (BDFG) in the adjustable drive systems. The grid-connected BDFG-based ac power generation system can be applied to variable speed constant frequency (VSCF) wind power and hydropower generation. The aim of this system is to regulate the active and reactive power of PW, which can be achieved by MSC. The control objective of the BDFG-based dc power generation system is to regulate the active power for grid-connected operation mode, and to adjust the dc bus voltage for standalone operation mode. Lots of control technologies for BDFG-based ac and dc power generation systems have been developed toward industry applications in wind power, ship shaft power, hydropower, and so on.
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