Control method and system for cascaded converter multi-submodule multi-working condition simulation device

Abstract

The invention provides a control system for a cascaded converter multi-submodule multi-working condition simulation device. A simulation device includes a current generator used for generating testingcurrent and a submodule system; the submodule system includes upper and lower bridge testing units which are in series connection, and used for receiving the current generated by the current generator and output capacitance and voltage signals of submodules; a cascaded converter system parameter module is used for outputting current and voltage reference signals corresponding to actual cascaded converter system parameters and operation working conditions to a current controller and a voltage controller; the current controller is used for generating a control signal of the current generator; and the voltage controller is used for generating the control signal of switch devices in each testing unit of the submodule system. A control method is simultaneously provided. The system can realizethe 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 testingcosts can be saved, and testing efficiency and accuracy can be enhanced.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a control method and system for a cascaded converter multi-submodule multi-working condition simulation device. Background technique [0002] The cascaded converter is composed of cascaded sub-modules, and 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 in actual working conditions. 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 ...

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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