Three-port AC-DC and three-port DC transformer combined AC/DC converter and control method thereof

TLDR: In this article, a three-port AC-DC and threeport DC transformer combined AC/DC converter and a control method for power electronic converters is presented. But the authors do not specify the control method of the converter.

Abstract: The invention discloses a three-port AC-DC and three-port DC transformer combined AC/DC converter and a control method thereof, which belong to the technical field of power electronic converters. Thethree-port AC-DC and three-port DC transformer combined AC/DC converter is composed of a three-port bidirectional AC/DC converter and a three-port bidirectional DC converter, and two DC buses with constant high voltage and variable low voltage exist. By using the variable-low voltage DC bus, the gain match between input and output voltage of the DC converter can be directly realized, the three-port DC converter can constantly work at the optimal efficiency point with fixed gain, and besides, the multi-level characteristic is advantageous to reduce the switching loss of the three-port AC/DC converter and the volume of an AC-side filter, the overall efficiency of the converter can be greatly enhanced, and the converter is particularly suitable for a AC-DC bidirectional power conversion situation with dramatic changes in DC-side voltage and has important application value and application prospects in electric vehicles, energy storage systems and other fields.