Synchronized phasor measurement method and system for anti-attenuation DC component interference

A technology of synchronized phasor measurement and DC component, which is applied to the phase angle between voltage and current, measurement device, and measurement of electrical variables, etc. It can solve the problem that the DC component cannot be dealt with attenuation of fault signals, and achieve high synchronized phasor measurement Accuracy, small amount of calculation, high-precision effect

Active Publication Date: 2021-10-08
SHANDONG UNIV
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Problems solved by technology

[0005] In order to solve the above problems, the present disclosure proposes a synchronized phasor measurement method and system that is resistant to attenuation DC component interference. The disclosure can deal with the attenuation DC component of various time parameters, has good anti-noise performance, and has a light calculation burden , which can solve the problem that the traditional discrete Fourier transform-based synchrophasor measurement algorithm cannot cope with the attenuated DC component in the fault signal when the power system fails

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[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. 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.

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0027] It should be noted that the following detailed description is exemplary and intended to provide further explanation of the present disclosure. Unless defined otherwise, all technical and scientific terms used h...

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Abstract

This disclosure provides a synchronized phasor measurement method and system for anti-attenuation DC component interference, which performs full-wave discrete Fourier transform on the signal to be measured, and then extracts four half-wave discrete Fourier transforms from the calculation process Result; based on the extracted four half-wave discrete Fourier transform results, the error caused by the attenuated DC component in the phasor measurement result is calculated, and the error is removed; the traditional discrete Fourier transform method based on the discrete Fourier transform can be solved when the power system fails. The synchrophasor measurement algorithm of Lie transform cannot deal with the problem of attenuated DC component in the fault signal.

Description

technical field [0001] The disclosure belongs to the technical field of synchronized phasor measurement, and relates to a synchronized phasor measurement method and system capable of resisting attenuation DC component interference. 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] Monitoring the operating status of the power system is the premise of power system protection and control. The measurement of synchronized phasors plays a vital role in the monitoring of power system operation and is widely used in fault identification of transmission and distribution networks. If the highly interconnected modern power system fails to identify, isolate and remove it timely and accurately, the safe and stable operation of the system will be threatened, which poses a more serious challenge to the measurement of synchrophasors in the power system. ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R25/00
CPCG01R25/00
Inventor 于浩天靳宗帅张恒旭
Owner SHANDONG UNIV
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