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Modular parallel three-level Vienna rectifier, control system, and method

A control system and rectifier technology, applied in electrical components, conversion devices for converting AC power input to DC power output, output power, etc. problem, to achieve the effect of improving waveform quality, improving reliability and reducing total harmonic distortion rate

Active Publication Date: 2019-03-19
SHANDONG UNIV
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Problems solved by technology

When multiple three-level Vienna rectifier systems are directly connected in parallel in the form of a common DC bus and AC bus, a zero-sequence circulating current path is inevitably generated between each rectifier module. When the power distribution ratio of each rectifier module is different and the input filter inductor parameters When they are not equal, the problem of zero-sequence circulating current will be further aggravated, resulting in the distortion of the input current waveform of the system, the increase of the loss of the power switch tube, the reduction of the efficiency of the system, and even the shutdown or failure of the system

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  • Modular parallel three-level Vienna rectifier, control system, and method
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[0041] The present disclosure will be further described below in conjunction with the accompanying drawings and embodiments.

[0042] It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0043] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinati...

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Abstract

The present invention provides a modular parallel three-level Vienna rectifier, a control system and a method. The present disclosure effectively suppresses the zero-sequence circulation of a system,and the waveform quality of the input current is improved remarkably, so the invention is suitable for the working conditions that the current distribution proportions of two three-level Vienna rectifier modules are equal and unequal and the input filter inductances are equal and unequal. The elimination of the zero-point distortion of the input current fully considers the influence of the filterinductor on the relative position of the voltage vector and the current vector. The effect of the input current zero-crossing distortion is better than that in a conventional method, and the total harmonic distortion rate of the input current is reduced.

Description

technical field [0001] The present disclosure relates to a modularized parallel three-level Vienna rectifier, a control system and a method. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] In recent years, the application requirements of high-power rectifiers have gradually increased. Among them, the three-level Vienna rectifier has the advantages of small number of power devices, low cost, low input current total harmonic distortion (Total Harmonic Distortion, THD), high power density, high efficiency, etc. advantage has received widespread attention. This topology can be applied to systems such as radio communication, power factor correction, and wind power generation. [0004] However, the capacity of a single three-level Vienna rectifier is limited. In order to increase the capacity of the rectifier system, a single high-power rect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/219
CPCH02M7/219
Inventor 张承慧秦昌伟邢相洋李晓艳付有良王志祯
Owner SHANDONG UNIV
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