Dead-zone-free three-phase AC/DC converter with high-frequency rectifier bridge

Abstract

The invention discloses a dead-zone-free three-phase AC / DC converter with a high-frequency rectifier bridge, belonging to the field of three-phase AC / DC converters. The invention particularly relates to a dead-zone-free three-phase converter topological structure, aiming at being applied to a medium-power and high-power occasions. The dead-zone-free three-phase AC / DC converter reduces the current harmonic content at an AC side and decreases the specification of a filter under the condition of adopting a space vector control algorithm which is the same as that adopted by the traditional three-phase bridge-type converter and can realize bidirectional flow and natural switching of energy without extra switching loss. The dead-zone-free three-phase AC / DC converter comprises a DC-side support capacitor, a three-phase upper bridge arm power transistor, a three-phase lower bridge arm power transistor, a three-phase upper bridge arm freewheel diode, a three-phase lower bridge arm freewheel diode, a three-phase high-frequency rectifier bridge, a three-phase first straight-through prevention filtering inducer and a three-phase second straight-through prevention filtering inducer. The dead-zone-free three-phase AC / DC converter solves the problems of straight-through problem of the bridge arm power transistor of the traditional three-phase voltage source bridge-type converter and the problems of the double voltage reduction type converter which needs to shield redundant switching signals for reducing extra switch loss and zero crossing point distortion.

Description

technical field [0001] The invention relates to the field of three-phase AC-DC conversion, in particular to a topological structure of a three-phase converter without a dead zone. Background technique [0002] In recent years, with the development of industrial technology and the increasingly severe energy crisis, wind power generation, electric vehicles and other energy-saving and environmental protection technology fields have made great progress. Three-phase converters can realize the conversion of AC and DC power, and are widely used in medium and high power applications, and have received extensive attention. [0003] The traditional three-phase bridge AC / DC converter has a simple structure and can realize bidirectional flow of energy. The efficiency of the converter is high. The space vector control strategy can accurately control the AC side current and realize the reliable operation of the converter. . However, in the bridge topology, the power tubes of the upper a...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a high-efficiency and high-reliability three-phase AC / DC converter topology circuit to overcome the disadvantages of high harmonic content and zero-crossing distortion in the prior art

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