A three-port power electronic transformer

Abstract

The invention provides a three-port power electronic transformer which comprises a high frequency transformer, a first low-voltage converter module and N high-voltage converter modules, wherein N is anatural number not less than 2. Direct current ends of the N high-voltage converter modules are connected with a high-voltage direct current power supply end of the three-port power electronic transformer in series; a primary side of the high frequency transformer comprises N primary side coils which are connected with alternating current ends of the N high-voltage converter modules correspondingly in a one-to-one manner; a secondary side of the high frequency transformer is provided with a secondary side coil which is connected with an alternating current of the first low-voltage converter module. The three-port power electronic transformer has the advantages that the number of secondary side ports can be reduced, the problem in insulation of low and high voltage ports between multiple high frequency transformers is solved, the size of high frequency transformers is effectively reduced and the power density of the three-port power electronic transformer is improved.

Description

technical field [0001] The invention relates to the field of a three-port power electronic transformer, in particular to a three-port power electronic transformer. Background technique [0002] As a large number of distributed renewable energy devices and energy storage equipment are connected to the grid, the grid's requirements for its supporting equipment are gradually increasing. Among them, the supporting equipment capable of actively controlling and distributing energy is the top priority for future development. Power electronic energy conversion devices including high-frequency transformers have attracted widespread attention in the industry as a representative of them. For example, as a substitute for traditional transformers, power electronic conversion devices add new energy access, reactive power compensation, DC power interface, frequency conversion output, and improved power quality based on the original electrical isolation and voltage regulation functions of ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose a three-port power electronic transformer to solve the insulation problem of the high and low voltage ports between the original multiple high-frequency transformers and reduce the volume of the high-frequency transformer

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