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A d.c.- ripple reinjection principle is described which reduces the harmonic content produced by static convertors. It is shown by theory and experiment that, using this principle, a six-pulse convertor configuration can be made to operate as a twelve-pulse convertor from the point of view of a.c. and d.c. system harmonics. The reinjection circuit includes a feedback convertor in series with the d.c. output. This convertor provides automatic adjustment of the reinjected current as the load changes and improves the efficiency of the overall system.
Baird et al. (Tue,) studied this question.