Internal mold based frequency adaptive phase-locked loop modeling method

A technology of frequency adaptation and modeling method, applied in the field of signal processing, which can solve the problems of three-phase unbalance, poor synchronization effect, large phase, etc.

Inactive Publication Date: 2019-07-12
河北交通职业技术学院 +1
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Problems solved by technology

The most commonly used phase-locked loop (SRF-PLL) based on synchronous rotating coordinate system (SRF-PLL), can accurately extract the positive sequence component of the voltage, has good dynamic response speed and small error, but the voltage distortion and frequency fluctuation at the same time In the existing environment, because the low-pass filter of SRF-PLL does not have the ability of frequency adaptation, there are contradictions in the selection of bandwidth, and

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  • Internal mold based frequency adaptive phase-locked loop modeling method
  • Internal mold based frequency adaptive phase-locked loop modeling method
  • Internal mold based frequency adaptive phase-locked loop modeling method

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Embodiment Construction

[0097] The technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0098] In the following description, a lot of specific details are set forth in order to fully understand the present invention, but the present invention can also be implemented in other ways different from those described here, and those skilled in the art can do it without departing from the meaning of the present invention. By analogy, the present invention is therefore not limited to the specific examples disclosed below.

[0099] The internal mod...

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Abstract

The invention discloses an internal mold based frequency adaptive phase-locked loop modeling method, and relates to the technical field of signal processing. The method comprises the following steps that a synchronous rotating coordinate system phase-locked loop SRF-PLL model is constructed; a frequency adaptive filter IMAF is used, a positive, negative and zero sequence separated calculation module PNZSC extracts a positive sequence fundamental wave voltage of the power system, and a low pass filter module in the SRF-PLL model is replaced; and at the same time, a source decoupling-end normalized phase-locked loop SUN-FLL is used to provide estimated frequency for the frequency adaptive filter IMAF, and finally the IMAF-PLL model is obtained. The method has a good frequency selection effect and high stability, and the phase-locked loop is more robust to resist voltage fluctuation and frequency fluctuation.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to an internal model-based frequency adaptive phase-locked loop modeling method. Background technique [0002] During the operation of an independent power system or an independent grid, in addition to voltage distortion, there will also be system frequency fluctuations or offsets caused by load active power fluctuations. The most commonly used phase-locked loop (SRF-PLL) based on synchronous rotating coordinate system (SRF-PLL), can accurately extract the positive sequence component of the voltage, has good dynamic response speed and small error, but the voltage distortion and frequency fluctuation at the same time In the existing environment, because the low-pass filter of SRF-PLL does not have the ability of frequency adaptation, there are contradictions in the selection of bandwidth, and the synchronization effect is poor; the recently proposed double second order gene...

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Application Information

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IPC IPC(8): H02J3/01
CPCH02J3/01H02J2203/20Y02E40/40
Inventor 刘正春王勇杨炜红谷志峰汪雄剑安树付佳张珊
Owner 河北交通职业技术学院
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