Harmonic elimination by DC ripple reinjection in generator-convertor units operating at variable speeds

摘要

A method of increasing the pulse number of an HVDC power convertor based on the reinjection of the DC ripple is applied to a unit-connected generator-convertor scheme operating at variable speeds. Theoretical and experimental results are provided which demonstrate that, with the proposed modification, a single-bridge configuration can be made to operate as an 18-pulse power convertor for a wide range of generator frequencies.