A three-phase cuk buck-boost three-level inverter

Abstract

The invention discloses a three-phase Cuk voltage rising and reducing three-electric level inverter. The circuit mode comprises a DC bus, switch tubes, diodes, inductors and capacitors. The inverter can be applied to a voltage rising and reducing occasion under the condition that a transformer or a forestage DC converter is not needed, is small in size, high in efficiency and low in cost, can realize that output voltage amplitude value is greater or smaller than input voltage amplitude value, is large in output voltage range, and high in utilization ratio of maximal DC voltage, requires DC bus with low voltage under the condition that requirements of same three-phase loading or three-phase grid are met, and has common mode inhibiting ability; the voltage stress of switch tubes is half of that of conventional voltage rising and reducing inverters of three-phase Cuk inverters, and the like; the inverter is more suitable for being applied to middle-high voltage occasions.

Description

technical field [0001] The invention relates to an inverter in the technical field of power electronic converters, in particular to a three-phase Cuk buck-boost three-level inverter. Background technique [0002] As a kind of power electronic equipment, the basic function of the inverter is to convert the DC input power into AC power to meet the load requirements of the load or the grid. Among them, single-phase inverters are mainly used in small and medium power occasions, with simple structure and low cost; and three-phase inverters are suitable for higher power occasions due to their structural characteristics, and are widely used in photovoltaic grid-connected, motor drives, and aviation power supplies. And other industrial occasions. [0003] Traditional three-phase inverters mainly include three-phase half-bridge two-level inverter topologies, three-phase mid-point clamp three-level inverters and other topologies. Their common feature is that the output voltage amplit...

AI Technical Summary

Problems solved by technology

However, the inverter scheme proposed in this application is a two-level inverter, which limits its application in medium and high voltage applications

In the article A single-stage three-phase DC / AC inverter based on Cuk converter for PV application published by Darwish et al. at the IEEE GCC conference in 2013, a three-phase single-stage inverter based on Cuk converter was proposed. The output voltage amplitude of the inverter can be greater than or less than the input DC voltage amplitude and has good common-mode rejection capability; however, the inverter is a two-level inverter, and in high-voltage power conversion occasions, there is a switching tube voltage Defects such as high stress, high harmonic content of output voltage, and large loss

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