A HF-Linked Power Interface using a Biased Saturable Transformer

The purpose of this work is to realize a simple power interface circuit between an alternative energy system and the utility grid that has the intrinsic property of protective isolation during the course of the line fault. We will propose a power interface using a biased saturable transformer. This circuit has the intrinsic properties not only of isolation but also of spontaneous disconnection in the course of the line fault. The quantity and the direction of the power from the dc source to the utility grid are controlled only by the phase lead angle of the inverter. It is possible to use this power interface in the high frequency linked equipment with its own properties.