If all traction substations within a traction power supply system are equipped with AC-DC-AC converters, continuous power supply can be achieved along the entire railway through interconnected substations, eliminating segmentation between them. In this configuration, the AC-DC-AC converters at these substations act as loads connected to the electric power system, with their single-phase sides interconnected via the traction power supply network. This setup forms a mutually supported traction power supply microgrid that spans the entire railway. Consequently, the three-phase side of the AC-DC-AC converters in this continuous traction power supply system is linked to the electric power system, while the single-phase side connects to the traction network. Typically, this is arranged in a three-phase-to-single-phase converter topology, with AC ports on both sides connected to the active power supply network. The AC ports on either side of the converters operate in a four-quadrant mode, enabling active interconnection and control of both active and reactive power.