Three phase buck-boost type three level inverter

Abstract

The invention discloses a three phase buck-boost type three level inverter. The three phase buck-boost type three level inverter is characterized in that a circuit type of the three phase buck-boost type three level inverter comprises a direct current bus, a switch tube, a diode, an electric inductor and a capacitor. The three phase buck-boost type three level inverter has the advantages of being used in a buck-boost type occasion under the circumstance that a transformer or a forestage direct current convertor is not needed, small in size, high in efficiency, low in cost, capable of achieving the purpose that amplitude of output voltage is larger than or less than amplitude of input voltage, large in output voltage range, and high in maximum direct current voltage utilization ratio, needing low direct current bus voltage under the circumstance of meeting the same three phase load or the same three phase grid demands as a traditional buck-boost type inverter, having common mode rejection ability, and being suitable for a middle and high voltage occasion due to the fact that voltage stress of the switch tube is one half of the traditional buck-boost type inverter such as a three phase buck-boost type inverter.

Description

technical field [0001] The invention relates to an inverter in the technical field of power electronic converters, in particular to a three-phase 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 midpoint clamp three-level inverters and other topologies, and their common characteristics are that the output voltag...

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 "Double-loop control and stability analysis based on three-phase Buck-boost inverter" published by Zhu Jianlin and others at the International Motor Control and System Conference in 2008, a three-phase single-stage inverter based on Buck-boost DC converter was proposed. Inverter, the output voltage amplitude of the inverter can be larger or smaller than the input DC voltage amplitude and has good common-mode rejection capability; Defects such as high voltage stress of the switching tube, high harmonic content of the output voltage, and large loss

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