Current distortion elimination system and method for cascade converter working condition simulation

Abstract

The invention provides a current distortion elimination system and method for cascade converter working condition simulation, and the system comprises a current generator which is used for providing a test current and a DC power supply voltage, transmitting the test current and the DC power supply voltage to a current controller and meanwhile, receiving an internal switching device control signal generated by the current controller; a test module group used for providing a port voltage of a test bridge arm and sending the port voltage to the current controller; a voltage controller used for providing modulation voltage of the test bridge arm and sending the modulation voltage to the current controller; and a current controller used for generating an internal switching device control signal of the current generator according to the test current, the direct-current power supply voltage, the port voltage and the modulation voltage, outputting the internal switching device control signal to the current generator, and compensating a bridge arm voltage of a step wave into a sine wave by dynamically compensating a voltage error introduced by nearest level approximation control. Therefore, distortion of the test current is eliminated, and the waveform of the test current is improved. According to the invention, the current control effect can be obviously improved, and the test precision is improved.

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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