Back-to-back testing circuit based on DC/DC converter

Abstract

The invention provides a back-to-back testing circuit based on a DC / DC converter. The back-to-back testing circuit comprises DC buses, a power supply module and a DC / DC converter module. The DC buses are used for connecting the power supply module and the DC / DC converter module in series. According to the back-to-back testing circuit, a back-to-back connection manner is utilized on a tested member; Supplying of one end DC voltage to the tested member is required. Furthermore voltage grade can be selected according to a relatively low rated DC voltage of the tested member. More importantly, two converters can feed most absorbed electric energy back to a power grid, and the power supply part of the testing circuit only supplies a relatively low output current, thereby greatly reducing capacity and manufacture difficulty of testing equipment, and greatly reducing testing equipment cost and operation cost in testing.

Description

technical field [0001] The invention relates to a power electronic system, in particular to a back-to-back test circuit based on a DC / DC converter. Background technique [0002] The demand for the access of distributed renewable energy, the power supply of marine islands, and the centralized transmission of offshore wind farm clusters proposed by the construction of a new urban power grid makes the traditional AC power grid face more and more challenges. The HVDC transmission network based on HVDC transmission technology provides a flexible, economical and efficient technical means to solve the above problems, and has also become one of the research hotspots in the field of power grid technology in the world. [0003] In the AC power grid, the AC transformer realizes the conversion between different voltage levels, and in the DC power grid, the DC / DC converter realizes the interconnection and voltage conversion of different levels of DC voltage. Its main functions include r...

AI Technical Summary

Problems solved by technology

[0004] The DC / DC converter directly determines the safety and economy of the DC power grid. Therefore, it is necessary to provide a technical solution for testing the performance of the DC / DC converter to break through the current research on high-voltage and large-capacity DC / DC converters. , most research institutions are in the stage of theoretical analysis and simulation verification, and some of them are developing small-capacity experimental prototypes, and there is still a big gap from engineering applications.

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