Single-phase five-level rectifier based on t-type structure

Abstract

Single-phase five-level rectifier based on T-shaped structure, AC power V S One side is respectively connected to the diode D 1 anode, diode D 2 Cathode, the connection node constitutes terminal b; AC power supply V S The other side is connected to one end of the inductor L, and the other end of the inductor L is respectively connected to the diode D 3 anode, diode D 4 Cathode, connecting nodes to form terminal a; switching tube Q 1 The drains are connected to the diode D 1 cathode, diode D 3 cathode, diode D 8 The anode, connected to the node to form the terminal c; the switch tube Q 2 The source is connected to the diode D respectively 2 cathode, diode D 4 Cathode, connecting nodes to form terminal d; switching tube Q 1 The drain and source are respectively connected to the switching tube Q 3 Source, switch tube Q 2 Drains, whose connection node constitutes terminal e; diode D 8 Cathode and capacitor C 1 One end is connected to the node to form the terminal f; the switch tube Q 3 Drain Connection Capacitance C 1 At the other end, their connected nodes form the endpoint n. The invention is based on a T-shaped single-phase five-level rectifier, which can increase the power density of the converter and reduce the voltage and current stress of the power device.

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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