High reliability five-level three-phase dual-input inverter

Abstract

The invention discloses two high-reliability five-level three-phase double-input inverters. The first three-phase double-input inverter consists of two independent input sources, twelve switch tubes, twelve diodes, six filter inductors; the second type of three-phase dual-input inverter consists of two independent input sources, twelve switch tubes, eight diodes, and six filter inductors. When the invention is in any mode, one of the upper bridge arm and the lower bridge arm is connected in reverse series with a certain diode in the topology, which avoids direct connection in structure and has high reliability. The present invention utilizes the combined conversion of double input power supply and switch to form multi-level output. The dual input sources of the system, Vin1 and Vin2, have different voltages, and the purpose of time-sharing power supply to the inverter is achieved through control; if Vin1 is boosted by Vin2 through Boost, part of the system output power comes directly from Vin1, and the other part comes from the boost unit , to achieve a single-stage conversion of part of the power, which not only reduces the capacity of the booster unit, but also improves the system efficiency.

Description

technical field [0001] The invention belongs to the technical field of power electronics, in particular to the technical field of DC-AC conversion, and specifically refers to a three-phase double-input inverter without the risk of bridge arm through-through. Background technique [0002] With the rapid development of aviation power supply, new energy power generation, electric vehicles and other technologies, high reliability and high efficiency inverter inverter technology has received extensive attention. [0003] The switching bridge arm of the traditional three-phase inverter is composed of two switching tubes in series, and the switching bridge arm is directly connected in series with the DC power supply. In order to prevent the switching bridge arm from passing through, an appropriate dead time must be added to the switching tube. This will lead to the deterioration of the quality of the inverter output waveform, and when the inverter is disturbed, the two switch tubes...

AI Technical Summary

Problems solved by technology

This will lead to the deterioration of the inverter output waveform quality, and when the inverter is disturbed, the two switch tubes are still in danger of being turned on at the same time, resulting in a short circuit of the DC power supply

[0004] On the other hand, in high-voltage and high-power inverter applications, multi-level inverter technology has received more and more attention. People have proposed different circuit topologies and control strategies, but multi-level inverters still have circuit The disadvantages of complex and complex control methods affect the reliability of the inverter system

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