Working condition simulation test system and method for cascade converter sub-module

Abstract

The invention provides a working condition simulation test system for a cascade converter sub-module. The working condition simulation test system comprises a current generator used for outputting a current, the to-be-tested sub-module used for receiving the current generated by the current generator and outputting a capacitor voltage signal, an electric impedance network used for controlling andfiltering the current output by the current generator, a current control system used for controlling a running state of each switching device in the current generator and adjusting the current outputby the current generator, a voltage control system used for driving on-off states of all the devices in the to-be-tested sub-module, and a cascade converter system model used for outputting the corresponding current and a voltage reference signal to the current control system and the voltage control system respectively. According to the test system, the simulation of the operation condition of anysub-module of a cascade converter can be realized, so that the test cost is saved, and the test efficiency and accuracy are improved.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a working condition simulation test system and a test method for cascaded converter sub-modules. Background technique [0002] At present, due to its unique structural characteristics, cascaded converters have been widely used and paid attention to in high-voltage and high-power applications. However, with the continuous improvement of the voltage level and capacity of the cascaded converter, the number of its sub-modules has also become extremely large. In order to ensure the reliable operation of the cascaded converter system, the verification and testing of its sub-modules becomes very important. [0003] In the traditional verification and testing of cascaded converter sub-modules, the voltage and current test conditions are often quite different from the actual working conditions. Usually, a relatively complete cascaded converter system must be built before sub-mo...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a working condition simulation test system and test method for cascaded converter sub-modules, so as to solve the problem of high system voltage level of the existing cascaded converter sub-module test system and the required The number of modules is large, the system consumes a lot of energy, it is difficult to apply complex dynamic voltage and current stress, the configuration is inflexible, and the safety requirements are high.

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