Power supply tie transformer, and regulation and control method therefor

An interconnecting power supply transformer, configured to:

• transmit electric energy from a first line and a second line of a power grid line to a power supply port, and interconnect the first line and the second line and mutually transmit the electric energy between the first line and the second line at a specified power, wherein the interconnecting power supply transformer comprises a multi-phase parallel transformer, a multi-phase series transformer and a plurality of safety protection auxiliary adjustment devices, wherein
• a head end of a primary side of the multi-phase parallel transformer is connected to the first line, and tail ends of the primary side of the multi-phase parallel transformer are connected together to form a first neutral point;
• a secondary side of the multi-phase parallel transformer has at least one power supply winding and a plurality of asymmetric windings, wherein the power supply winding is connected to the power supply port, and each of the plurality of asymmetric windings, through its respective switch bridge arm module, is interconnected with switch bridge arm modules corresponding to asymmetric windings of secondary sides of neighboring phases of the multi-phase parallel transformer to obtain a first electrical quantity, and the first electrical quantity is coupled to a primary side of the multi-phase series transformer through a secondary side of a corresponding phase of the multi-phase series transformer, so as to be connected to the second line;
• and
• each of the plurality of safety protection auxiliary adjustment devices is connected in series between the first line and the second line, and is configured to:
• perform power quality barrier and fault isolation on the first line and the second line, dynamically adjust a interconnecting power between the first line and the second line, and perform line fault protection on the multi-phase series transformer.