Single-phase five-level rectifier based on T-shaped structure

Abstract

The invention discloses a single-phase five-level rectifier based on a T-shaped structure, which is characterized in that one side of an alternating-current power supply VS is connected with the anodeof a diode D1 and the cathode of a diode D2, and the connection node forms an end point b; the other side of the alternating-current power supply VS is connected with one end of an inductor L, the other end of the inductor L is connected with the anode of a diode D3 and the cathode of a diode D4, and the connection node forms an end point a; the drain electrode of a switch transistor Q1 is respectively connected with the cathode of the diode D1, the cathode of the diode D3 and the anode of a diode D8, and the connection node forms an end point c; the source electrode of a switch transistor Q2is respectively connected with the cathode of the diode D2 and the cathode of the diode D4, and the connection node forms an end point d; the drain electrode and the source electrode of the switch transistor Q1 are respectively connected with the source electrode of a switch transistor Q3 and the drain electrode of the switch transistor Q2, and the connection node forms an end point e; the cathode of the diode D8 is connected with one end of a capacitor C1, and the connection node forms an end point f; the drain electrode of the switch transistor Q3 is connected with the other end of the capacitor C1, and the connection node forms an end point n. According to the single-phase five-level rectifier based on the T-shaped structure, the power density of the converter can be improved, and thevoltage and current stress of a power device is reduced.

Description

technical field [0001] The invention relates to the field of five-level electric energy conversion, in particular to a single-phase five-level rectifier based on a T-shaped structure. Background technique [0002] In recent years, multi-level power converters have received widespread attention, and their main advantages are as follows: With the increase of the number of levels, the voltage stress at both ends of the switch tube is greatly reduced, which is only 1 / (n of the DC bus voltage -1); The continuous increase of the level number can reduce the total harmonic content in the circuit, reduce the volume of the input filter inductor to a certain extent, and then improve the power density; the increase of the level number can reduce the switching frequency of the switching tube, and further reduce the switching loss , to improve the working efficiency of the circuit; compared with the three-level converter, under the same conditions, the switching tube voltage change du / dt ...

AI Technical Summary

Problems solved by technology

[0004] In view of the traditional three-level voltage stress, high harmonic content, and the five-level converter has a large number of switches, low power density, and large losses, the present invention proposes a single-phase five-level rectifier based on a T-shaped structure , the rectifier can increase the power density of the converter and reduce the voltage and current stress of the power device

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