Comparison of Thyristor Rectifier Configurations for a Six-Phase Rotating Brushless Outer Pole PM Exciter

Recent technological developments have caused a renewed interest in the brushless excitation system. With the application of wireless communication, the conventional diode bridge has been replaced with fully controllable thyristors on the shaft. It offers the same dynamic performance as the conventi...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2018-02, Vol.65 (2), p.968-976
Main Authors: Noland, Jonas Kristiansen, Evestedt, Fredrik, Perez-Loya, J. Jose, Abrahamsson, Johan, Lundin, Urban
Format: Article
Language:English
Subjects:
12-pulse thyristor rectifiers
Active rectification
Bridge circuits
brushless exciters
Communications systems
Configurations
Excitation
Fast-response exciters
Firing angle
Generators
hybrid-mode operation
multiphase machines
outer-pole PM machines
outer  pole  permanent-magnet  (PM)  machines
Power factor
Rectifiers
rotating exciters
Shafts
Stability
synchronous generators
Thyristors
Topology
Torque
Windings
Wireless communications
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Summary:Recent technological developments have caused a renewed interest in the brushless excitation system. With the application of wireless communication, the conventional diode bridge has been replaced with fully controllable thyristors on the shaft. It offers the same dynamic performance as the conventional static excitation system. The thyristor bridge of the conventional three-phase exciter needs to be controlled with a high firing angle in normal operation in order to fulfill a requirement of both a high ceiling voltage and a high ceiling current. A high firing angle causes high torque ripple to be absorbed by the exciter stator and a low power factor results in a low utilization of the designed exciter. In this contribution, we present a strategy that solves this problem by looking into combinations of thyristor configurations of a double-star six-phase connection of the exciter. Experimental results are used to verify the circuit models implemented for this investigation. A hybrid-mode 12-pulse thyristor bridge configuration seems to be a good solution for implementations in commercial apparatus. An additional switch interconnects two separate thyristor bridges from parallel- to series connection at the rectifier output, and utilizes the advantages of both topologies.
ISSN:0278-0046
1557-9948
1557-9948
DOI:10.1109/TIE.2017.2726963