Control method of multi-phase interleaving inverter circuit, power conversion device and energy storage equipment

Abstract

The invention belongs to the technical field of converter control, and provides a control method of a multi-phase interleaving inverter circuit, a power conversion device and energy storage equipment, when it is detected that an output waveform of a voltage output signal of the multi-phase interleaving inverter circuit enters a positive half cycle, a lower switch tube of a converter bridge arm is controlled to be kept on in the positive half cycle, and the output waveform of the voltage output signal enters the negative half cycle. When it is detected that the output waveform enters the negative half cycle, an upper switch tube of the converter bridge arm is controlled to be kept on in the negative half cycle, and when it is detected that the output waveform enters the rising stage of the positive half cycle, an upper switch tube of the power conversion bridge arm is controlled to be on or off, and a lower switch tube of the power conversion bridge arm is controlled not to be on; when it is detected that the output waveform enters the descending stage of the negative half cycle, a lower switching tube of the power conversion bridge arm is controlled to be switched on or switched off, and an upper switching tube of the power conversion bridge arm is controlled not to be switched on. By improving the switching control logic of the alternating current bridge arm and the power conversion bridge arm, the loss of the multi-phase interlaced inverter circuit under the no-load condition is reduced.

Description

technical field [0001] The present application belongs to the technical field of converter control, and in particular relates to a control method of a multi-phase staggered inverter circuit, a power conversion device, and an energy storage device. Background technique [0002] A bidirectional inverter is a converter that converts DC power into AC power. In the working process of the traditional multi-phase interleaved inverter, in order to improve the efficiency, there are usually two switching tubes (ie, power frequency switching tubes) working at the fundamental frequency, and four switching tubes at the high frequency ( switching frequency) work switch tube (ie high frequency switch tube). In a power frequency cycle, it is necessary to maintain a power frequency switch tube and a corresponding high frequency switch tube to work at the same time. [0003] However, when the converter is light-loaded or no-loaded, maintaining multiple switches to work simultaneously in one...

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Problems solved by technology

[0004] The purpose of this application is to provide a control method for a multi-phase interleaved inverter circuit, a power conversion device, and an energy storage device, aiming at solving the problem of increased loss caused by maintaining multi-tube operation when the inverter is light-loaded or no-loaded , there is a problem of low conversion efficiency

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