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Vienna rectifier harmonic suppression method used under power grid imbalance condition

A power grid imbalance and harmonic suppression technology, applied in electrical components, output power conversion devices, AC power input into DC power output and other directions, can solve problems such as inherent zero-crossing distortion, to solve zero-crossing distortion, control The structure is simple and the effect of avoiding the difficulty of phase locking

Pending Publication Date: 2022-05-10
SHANDONG UNIV
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  • Claims
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Problems solved by technology

The above methods are not combined with the Vienna rectifier, and the inherent zero-crossing distortion problem caused by the special structure of the Vienna rectifier has not been solved

Method used

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  • Vienna rectifier harmonic suppression method used under power grid imbalance condition
  • Vienna rectifier harmonic suppression method used under power grid imbalance condition
  • Vienna rectifier harmonic suppression method used under power grid imbalance condition

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Embodiment Construction

[0041] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0042] It should be noted that the following detailed description is exemplary and intended to provide further explanation of the present invention. 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 invention belongs.

[0043] It should be noted that the terminology used here is only for describing specific embodiments, and is not intended to limit exemplary embodiments according to the present invention. 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 combinations thereof.

[0044] A ...

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Abstract

The invention provides a Vienna rectifier harmonic suppression method used under a power grid imbalance condition. The method comprises the following steps: carrying out PI control on a direct current side voltage; eliminating zero crossing point distortion by using current orientation, and calculating a Vienna rectifier side voltage; calculating a current reference value by using the voltage and current at the side of the Vienna rectifier and a delay signal thereof under the alpha-beta axis; reference voltage is obtained through closed-loop control of a current alpha-beta axis, and control of the Vienna rectifier is achieved. Positive and negative sequence separation of power grid voltage and complex and numerous control parameters are not needed, the problem of zero crossing point distortion is thoroughly solved, power grid current sine is achieved, and the current quality is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of Vienna rectifier control, and in particular relates to a method for suppressing harmonics of a Vienna rectifier under the condition of unbalanced power grid. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] Compared with two-level converters, Vienna rectifiers have smaller dv / dt, lower total current distortion and higher power density. Compared with traditional NPC topology, Vienna rectifier has lower loss, higher power density and larger power capacity. Based on the above advantages, Vienna rectifiers are widely used in communication systems, wind power generation systems and PFC circuits. [0004] Due to the particularity of the topological structure, the Vienna rectifier has an inherent zero-crossing distortion problem. The root cause is that there is a phase differ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/12H02M7/219
CPCH02M1/12H02M7/219
Inventor 张承慧张博学邢相洋
Owner SHANDONG UNIV
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