Control Scheme for Reducing Second Harmonic Current in AC–DC–AC Converter System

In the ac–dc–ac converter system, the second harmonic current (SHC) is generated by the ac–dc rectifier and the dc–ac inverter. If the SHC propagates to the intermediate dc–dc converter, the current stress of the power switches will be increased, and the conversion efficiency will be degraded. Therefore, it is necessary to suppress the SHC in the dc–dc converter. In this article, the generation an...