Balancing device stresses by fundamental cancellation

The technique of harmonic cancellation relies on destructive interference of specific Fourier components between two or more similar but phase-displaced waveforms. The components eliminated are traditionally harmonics of the basic operating frequency. However, there is a no inherent reason why the fundamental cannot be eliminated. The intuitively repellent concept can be advantageously employed to balance device (current fed converter) stresses in single-phase applications. A typical application is examined by simulation to illustrate that traditional methods can result in unbalanced conditions. A method is described for deriving suitable waveforms for fundamental elimination. The simulation is repeated with the selected waveforms to show that balance has been restored