Abstract
This study presents the experimental results on the implementation of a 84-pulse voltage-source converter (VSC), assembled by combining a 12-pulse VSC in conjunction with an asymmetric single-phase seven-level converter. The phase-locked-loop strategy used ensures the determination of the system's frequency and phase-angle of the fundamental positive sequence voltage of the controlled AC bus. The injection transformer added to the configuration allows the total harmonic distortion on the VSC's output to be compliant with the IEEE STD 519-1992, for its use in special applications. The amount of switches and capacitors employed on the implementation, and the wide turn ratios allowed to the re-injection transformer, constitute an attractive array in terms of cost and reduced output voltage distortion and notching.
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