Current Distortion Elimination System and Method for Cascaded Converter Working Condition Simulation

Abstract

The present invention provides a current distortion elimination system and method for simulating the working conditions of cascaded converters, including: a current generator, used to provide test current and DC power supply voltage, and send them to the current controller; at the same time, receive the current The internal switching device control signal generated by the controller; the test module group is used to provide the port voltage of the test bridge arm and sent to the current controller; the voltage controller is used to provide the modulation voltage of the test bridge arm and sent to the current controller The current controller, according to the test current, DC power supply voltage, port voltage and modulation voltage, generates the internal switching device control signal of the current generator and outputs it to the current generator, and controls the introduced voltage by dynamically compensating the nearest level approach Error, the bridge arm voltage of the ladder wave is compensated to a sine wave, thereby eliminating the distortion of the test current and improving the test current waveform. The present invention can obviously improve the current control effect and improve the testing precision.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a current distortion elimination system and method for simulating working conditions of cascaded converters. Background technique [0002] In recent years, cascaded converters have been widely used and paid attention to in medium-high voltage and high-power fields due to their characteristics of modularization, easy expansion, and low ripple. However, with the continuous improvement of the voltage level and capacity of the cascaded converter, the number of sub-modules of the cascaded converter will also become very large, and the reliability of the cascaded converter mainly depends on the sub-modules of the cascaded converter. module reliability. In order to ensure the reliable operation of the cascaded converter system, the verification and testing of its sub-modules becomes very important. [0003] At present, the main modulation method of the cascaded converter is ...

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Problems solved by technology

[0004] 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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