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Adaptive synchronous phasor measurement method based on signal identification

A technology for synchrophasor measurement and signal identification, which is used in measurement devices, measurement of electrical variables, and the phase angle between voltage and current. The effect of error-eliminating, accurate and fast phasor measurements

Active Publication Date: 2017-11-14
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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Problems solved by technology

However, due to the lack of research on the mechanism of power grid signal noise content and its impact on phasor measurement, the existing PMU standards do not require noise content and measurement error limits under noise conditions

Method used

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  • Adaptive synchronous phasor measurement method based on signal identification
  • Adaptive synchronous phasor measurement method based on signal identification
  • Adaptive synchronous phasor measurement method based on signal identification

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Embodiment Construction

[0041] 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 some 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.

[0042] Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings, as figure 1 Shown is a schematic flow chart of an adaptive synchrophasor measurement method based on signal identification provided by an embodiment of the present invention, and the method includes:

[0043] Step 1, establish a dynamic phasor model, and use the second-order Taylor series to simulate the dynamic changes o...

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Abstract

The invention discloses an adaptive synchronous phasor measurement method based on signal identification. The method comprises the steps of establishing a dynamic phasor model, and simulating dynamic changes of phasor amplitude, phase angle, frequency and frequency change rate by means of a two-order Taylor series; by means of the established dynamic phasor model, obtaining a behavior rule of phasor model parameters in a power system typical static / dynamic process; according to the behavior rule of the obtained phasor model parameters, performing signal type identification, thereby identifying electric power signal transient change, a static process which does not comprise noise, a static process which comprises the noise, and a dynamic process; and aiming at the identified electric signal transient change, the static process which does not comprise the noise, the static process which comprises the noise, and the dynamic process, respectively performing adaptive construction of a time window before and after the transient change, noise inhibition and dynamic phasor compensation. The adaptive synchronous phasor measurement method can realize accurate and quick phasor measurement on the condition that the static signal or the dynamic signal is input.

Description

technical field [0001] The invention relates to the technical field of synchronized phasor measurement, in particular to an adaptive synchronized phasor measurement method based on signal identification. Background technique [0002] Power system security is an important part of national security, and power system measurement technology is the foundation of power system security. Synchronous phasor measurement unit (Phasor Measurement Unit, PMU) has been rapidly developed and widely used at home and abroad because of its high precision and high upload rate. However, the power system has shown more and more obvious characteristics of power electronics, which has led to essential changes in the characteristics of the power system, and the security of the power system is facing new challenges. The spectrum characteristics of electrical quantities are complex, there are many time-domain transients, and the dynamic process is fast, which makes it more difficult to measure the dy...

Claims

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Application Information

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IPC IPC(8): G01R25/00
CPCG01R25/00
Inventor 刘灏李珏毕天姝
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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