2017/07/14 by Jonas Kristiansen Nøland, Fredrik Evestedt, J. Jose Pérez-Loya +2 · 32 citations
Engineering · #Electromagnetic Launch and Propulsion Technology #Particle accelerators and beam dynamics #Wireless Power Transfer Systems #Thyristor #Exciter #Rectifier (neural networks) #Stator #Engineering #Control theory (sociology) #Integrated gate-commutated thyristor #Electrical engineering #Voltage #Computer science
paper · doi:10.1109/tie.2017.2726963
published in IEEE Transactions on Industrial Electronics 65(2), 968-976 (Institute of Electrical and Electronics Engineers)
openalex publication_date 2017/07/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/27
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.