Test circuit for multi-submodule multi-working condition simulation of cascaded converter

Abstract

The invention provides a testing circuit for cascaded converter multi-submodule multi-working condition simulation. The circuit includes a current generator and a submodule system; the current generator is used for generating testing current and includes a three-port converter and corresponding filters; the submodule system includes an upper bridge arm testing unit module and a lower bridge arm testing unit module which are in series connection; the upper bridge arm testing unit module includes multiple upper bridge arm testing units in series connection; the lower bridge arm testing unit module includes multiple lower bridge arm testing units in series connection; each testing unit includes two detected submodules in reverse series connection; and the upper and lower bridge arm testing units receive the testing current generated by the current generator and output voltage signals, or the voltage signals and current signals of the detected submodules in each testing unit to external. The circuit can realize the operation working condition simulation of any submodules of a cascaded converter, and realize the simultaneous testing of the multiple submodules under multiple working conditions, so that testing costs can be saved, and testing efficiency can be enhanced.

Description

Technical field [0001] The invention relates to the technical field of power electronics, in particular to a test circuit for cascading converter multi-sub-module multi-working condition simulation. Background technique [0002] The cascaded converter is composed of cascaded sub-modules. Its basic structure makes the system easy to expand and has a good prospect in high-voltage and large-capacity operating scenarios. Since the operating characteristics of the sub-module are closely related to the converter, in order to ensure the long-term reliable operation of the converter, it is of great significance to test the operating characteristics of the sub-module under actual working conditions. However, the traditional cascaded converter sub-module testing method needs to build a more complete cascaded converter system, and its limitations are: [0003] 1) Building the system brings high time and economic costs; [0004] 2) Great power loss during the test; [0005] 3) The system and op...

AI Technical Summary

Problems solved by technology

However, the traditional cascaded converter sub-module test method needs to build a relatively complete cascaded converter system, and its limitations are:

[0003] 1) Building the system brings high time and economic costs;

[0004] 2) Great power loss during the test;

[0005] 3) The system and operating parameters of the converter cannot be adjusted flexibly

[0007] At present, there is no description or report of the similar technology of the present invention, and no similar data at home and abroad have been collected yet.

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