Three-port DC converter

Abstract

The invention discloses a three-port DC converter and belongs to the technical field of power electronic converters. The three-port DC converter consists of an input DC source, a storage battery, a primary side circuit, a secondary side circuit, and a transformer. The primary side circuit is connected with the input DC source and the storage battery simultaneously; the secondary side circuit is connected with load; and the primary side and secondary side are in electrical isolation through the transformer. The three-port DC converter is characterized in that: due to a converter, the power management and control of a main power supply, the storage battery, and the load is realized, and the functions of a plurality of single-input single-output converters are realized; and compared with a mode of adopting a plurality of single-input single-output converters, the three-port DC converter has the advantages of reducing the number of switching devices and related control circuits, improving the conversion efficiency, simplifying the control circuit, achieving high reliability, adopting more compact layout and unified and effective management, improving the system stability, reducing the system cost, reducing the volume, and improving the power density.

Description

technical field [0001] The invention relates to a three-port DC converter, which belongs to the technical field of power electronic converters, and in particular to the technical field of power converters in the technical field of new energy power generation. Background technique [0002] With the increasingly severe energy crisis and environmental pollution, new energy power generation technologies such as solar energy, wind energy, and fuel cells have become the focus of attention and research around the world. According to whether the new energy power generation system is connected to the public grid, it can be divided into two modes: grid-connected operation and independent operation. The independent new energy power generation system is a very important way for the application of new energy power generation. It can solve the problem of power supply in remote mountainous areas, isolated islands and other areas without power grids. In addition, the structure of the indepe...

AI Technical Summary

Problems solved by technology

attached figure 1 A system composed of two independent converters, whose converters are controlled in a decentralized manner, has a large volume and weight; figure 1 In the system shown in (a), when the battery supplies power to the load, it needs to go through two stages of conversion, and the additional figure 1 In the system shown in (b), when the main power supply is used to charge the battery, it needs to go through two stages of transformation. There are many transformation stages and the system efficiency is low.

Images