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Static var generator no-phase-lock-loop control system, method and application

A static var, no phase-locked loop technology, applied in flexible AC transmission system, reactive power adjustment/elimination/compensation, output power conversion device, etc., can solve the problem of increasing control delay, reducing system control performance, increasing System control complexity and other issues to achieve the effect of improving response speed, avoiding complex calculations, and eliminating reactive power fluctuations

Active Publication Date: 2019-07-02
SHANDONG UNIV +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

This method requires complex calculations such as positive and negative sequence separation, phase-locked loop, etc., which increases the complexity of system control, increases control delay, and reduces system control performance.

Method used

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  • Static var generator no-phase-lock-loop control system, method and application
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  • Static var generator no-phase-lock-loop control system, method and application

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Embodiment Construction

[0037] The present disclosure will be further described below in conjunction with the accompanying drawings and embodiments.

[0038] 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.

[0039] 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 invention provides a static var generator no-phase-lock-loop control system, method and application. The method comprises the steps: acquiring a reference value of an output current of a neutral-point clamping type three-level static var generator in an alpha-beta static coordinate system through a voltage of the power grid and a signal with the 90-degree time delay thereof, thereby avoiding positive and negative sequence separation and a phase-locked loop algorithm; controlling a voltage outer loop of the neutral-point clamping type three-level static var generator by utilizing PI to realize the control of the voltage stabilization of a DC side; controlling a current inner loop of the neutral-point clamping type three-level static var generator through E-PR to realize tracking controlof inner loop current; adjusting the action time of redundant small vectors through proportional control to realize neutral-point potential balance control of the neutral-point clamping type three-level static var generator.

Description

technical field [0001] The present disclosure relates to a static var generator non-phase-locked loop control system, method and application. 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] The Neural Point Clamped (NPC) three-level converter has the advantages of low device withstand voltage requirements, less output waveform harmonics, low switching frequency, and high conversion efficiency, and is suitable for medium and high voltage input applications. [0004] However, during the transmission of electric energy in the grid, reactive power will not only cause additional power loss in transmission lines and distribution transformers, but also cause large voltage deviation or flicker at the voltage end, resulting in grid voltage instability. Therefore, reasonable reactive power compensation to the grid is a key measure to reduce power ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18H02J3/01H02M7/487
CPCH02J3/01H02J3/18H02M7/487Y02E40/10Y02E40/40
Inventor 张承慧姜英李晓艳邢相洋耿华胡顺全
Owner SHANDONG UNIV
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