A Novel Single-Phase Hybrid Three-Level Rectifier

Abstract

A new single-phase hybrid three-level rectifier comprises a single-phase uncontrollable diode rectifier bridge, a filter, a single-phase VIENNA rectifier bridge, a voltage and current sampling circuit, and a signal conditioning circuit. Through employing the above structure and a single-period control algorithm, the rectifier is simple in control method, is simple in structure, and just needs to collect an output voltage and an input current. The rectifier is very high in robustness, is high in power density, is large in power factor, is stable in output voltage, and is high in system reliability. Compared with a conventional single-phase rectifier, the rectifier provided by the invention can greatly improve the conversion efficiency, is large in application range, can greatly reduce the voltage stress of a power switching tube through employing the three-level structure, and can save a large amount of material resources and financial resources.

Description

technical field

[0001] The invention relates to the field of single-phase electric energy conversion, in particular to a novel single-phase hybrid three-level rectifier. Background technique

[0002] Nowadays, rectification is ubiquitous, and rectifiers are used in all power levels, so the research and improvement of rectifiers is very necessary. There are also many rectification methods that are most commonly used at present, such as uncontrolled diode full-bridge rectification, PWM rectification, synchronous rectification, etc., but there is a serious problem with uncontrolled rectification that the current harmonic content at the input terminal is very rich, and this has a great impact on the power grid. The danger is very great. PWM rectification is a good way to improve this shortcoming. It has low harmonic content and high power factor. With the development of rectification technology, the idea of ​​multi-level has been proposed, which greatly reduces the voltage str...

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