Co-phase power supply systems are designed to compensate for negative sequences and reactive power while eliminating neutral sections. Essentially, they represent a symmetrical conversion mechanism that transforms three-phase power into single-phase power. In co-phase power supply systems, which are typically constructed using different traction transformers, it has been demonstrated that achieving the symmetrical conversion of three-phase power to single-phase power cannot be accomplished solely through altering the connection of transformer windings. Various co-phase power supply technologies have been proposed that combine traction transformers with either active or passive compensation devices.