Method and device for detecting voltage parameter of three-phase power grid

A voltage parameter and detection method technology, applied in the field of power grid, can solve the problems of slow dynamic response speed and affecting the performance of three-phase voltage parameters, etc., and achieve the effect of fast dynamic response speed and excellent steady-state accuracy

Active Publication Date: 2018-03-13
XIDIAN UNIV
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Problems solved by technology

[0003] To sum up, the problems existing in the existing technology are: the existing three-phase grid voltage detection method has a slow dynamic response speed, which affects the performance of three-phase voltage parameter detection

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  • Method and device for detecting voltage parameter of three-phase power grid

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Embodiment Construction

[0040] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0041] The invention has fast dynamic response speed, and still has excellent steady-state precision under the condition of grid frequency variation.

[0042] The application principle of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0043] Such as figure 1 As shown, the three-phase power grid voltage parameter detection method provided by the embodiment of the present invention provided by the embodiment of the present invention includes the following steps:

[0044] S101: collect the three-phase voltage of the power grid;

[0045] S102: Perform Clarke transform...

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Abstract

The invention, which belongs to the technical field of power grids, discloses a method and device for detecting a voltage parameter of a three-phase power grid. Clark conversion is carried out on a collected grid voltage signal; an adaptive observer is established based on the signal after conversion; and a grid frequency as well as a positive sequence voltage component and a negative sequence voltage component is observed and amplitudes and phase angles of the positive sequence voltage component and the negative sequence voltage component of the grid are estimated. To be specific, three-phasevoltages of the power grid are collected; Clarke transformation is carried out to obtain a grid voltage under a coordinate system; an observer is constructed; a positive sequence voltage component and a negative sequence voltage component of the grid are calculated; and amplitudes and phase angles of the positive sequence voltage component and the negative sequence voltage component of the grid are calculated. The dynamic response speed is fast; and the method and device have high steady-state accuracy even when the grid frequency changes. The invention provides a method for detecting a voltage parameter of a three-phase power grid and a corresponding hardware circuit. And the dynamic response speed is fast; and the method has high steady-state accuracy even when the grid frequency changes.

Description

technical field [0001] The invention belongs to the technical field of power grids, in particular to a method and device for detecting voltage parameters of a three-phase grid. Background technique [0002] In power grid technology, it is often necessary to detect the positive sequence voltage component, negative sequence voltage component and their corresponding frequency, amplitude and phase angle of the three-phase grid voltage. In the prior art, it is usually realized by phase-locked loop technology. However, due to the use of linearization technology in the phase-locked loop, the response speed of the phase-locked loop is slow. Therefore, when a sudden frequency fault occurs in the power grid, the phase-locked loop cannot quickly and accurately estimate the positive-sequence voltage component and negative-sequence voltage component of the power grid. Thus affecting the control effect of the subsequent controller of the power grid. [0003] To sum up, the problem exis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00G01R25/00G01R23/02
CPCG01R19/0084G01R23/02G01R25/00
Inventor 戴志勇李建文张菊香马伯渊侯叶张杰
Owner XIDIAN UNIV
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