A dual active bridge dc-dc converter and its return power optimization method

Abstract

The invention discloses a dual-active bridge DC-DC converter and a return power optimization method thereof. The return power optimization method includes: collecting the actual output voltage of the converter, and according to the collected actual output voltage and the expected output voltage The difference is to get the expected per unit transmission power; according to the expected per unit transmission power and the voltage conversion ratio of the converter, the inner shift ratio and the outer shift ratio are obtained; the primary side is controlled according to the inner shift ratio and the outer shift ratio The switching tubes in the single-phase full-bridge circuit and the secondary-side single-phase full-bridge circuit realize zero-voltage turn-on or zero-current turn-off, and at the same time minimize the return power of the converter. The present invention realizes the precise control of the output voltage within a wide load range by controlling the internal and external movement of the dual active bridges, and on the other hand optimizes the return power of the converter, ensuring that all full-control switching devices achieve zero When the voltage is turned on or the zero current is turned off, the return power of the converter is minimized, and the efficiency of the converter is improved.

Description

technical field [0001] The invention belongs to the technical field of DC-DC converters, and more specifically relates to a dual active bridge DC-DC converter and a return power optimization method thereof. Background technique [0002] With the global energy crisis and the intensification of environmental pollution, distributed renewable energy, energy storage power stations and electric vehicles have developed rapidly, which has greatly promoted the popularization and development of DC distribution networks. The dual active bridge DC-DC conversion device has many advantages such as fast dynamic response, high power density, and bidirectional power flow, and has gradually become the core control unit of the DC distribution network. key equipment. The performance of the dual active bridge DC-DC converter will affect the operation performance of the entire DC distribution network. The performance optimization technology for the dual active bridge DC-DC converter has become a...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the defects of the prior art, the object of the present invention is to provide a dual active bridge DC-DC converter and its backflow power optimization method, aiming to solve the problem that the existing dual active bridge DC-DC converter has a large backflow power, which causes The problem of low transmission efficiency

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