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Cascaded H-bridge SVG system and method based on hybrid decentralized control

A decentralized control and hybrid technology, applied in flexible AC transmission systems, AC network voltage adjustment, reactive power adjustment/elimination/compensation, etc. Problems such as power system voltage changes, to achieve the effect of reducing system cost, reducing quantity, and fast response

Inactive Publication Date: 2019-05-31
SHANDONG UNIV +1
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Problems solved by technology

[0005] (1) The increase of power electronic equipment in the power grid will bring active power loss of the line, which will lead to a decrease in the voltage at the common contact;
[0006] (2) There are a large number of nonlinear loads in the power grid, and there will be severe reactive current changes in the power grid, resulting in changes in the voltage of the power system;
[0007] (3) The connection of a large number of reactive devices can easily lead to a drop in the grid voltage in a weak grid, which in turn affects the normal operation of other equipment in the system
It is difficult for the traditional control system to meet the requirement of fast tracking the given reactive power, which leads to the decrease of the stability and robustness of the system

Method used

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[0039] The present disclosure will be further described below in conjunction with the accompanying drawings and embodiments.

[0040] 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.

[0041] 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 disclosure provides a cascaded H-bridge SVG system and method based on hybrid decentralized control. The system and method can realize active and reactive power control during a grid voltage sag, balance control of SVG output current, stability and balance control of the DC-side capacitor voltage, and has the advantages of low cost, high reliability and fast fault response.

Description

technical field [0001] The present disclosure relates to a cascaded H-bridge SVG system and method based on hybrid decentralized control. 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] With the rapid development of power electronics, modern control and computer technology, unbalanced, impactful and nonlinear loads such as frequency conversion speed control equipment and electrified locomotives have been widely used in power grid systems, which makes the originally fragile power grid, variable become more vulnerable. Especially in weak power grids, grid voltage dips often occur, which adversely affects the normal operation of power electronic equipment in the system. Conversely, the abnormal operation of power electronic equipment also makes power quality problems such as reactive power and harmonics in the system more and more serious....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18H02J3/26H02J3/16
CPCY02E40/10Y02E40/30Y02E40/50
Inventor 张承慧李晓艳邢相洋耿华胡顺全
Owner SHANDONG UNIV
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