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A Synchronized Phasor Measurement Method Based on Clarke Transform

A technology of synchronized phasor measurement and Clarke transformation, applied in the field of power system, can solve problems such as secondary pulse error, synchronized phasor measurement accuracy and stability influence

Active Publication Date: 2020-07-07
SOUTHWEST JIAOTONG UNIV
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  • Description
  • Claims
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Problems solved by technology

[0007] The purpose of the present invention is to provide a synchronized phasor measurement method based on Clarke transform, which solves the problem of secondary pulsation error caused by negative double frequency component when the existing synchronized phasor measurement method has dynamic oscillation in the power environment. Problems that greatly affect the accuracy and stability of synchrophasor measurements

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  • A Synchronized Phasor Measurement Method Based on Clarke Transform
  • A Synchronized Phasor Measurement Method Based on Clarke Transform
  • A Synchronized Phasor Measurement Method Based on Clarke Transform

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Embodiment 1

[0085] A kind of synchronized phasor measurement method based on Clarke transform that the preferred embodiment of the present invention provides, comprises the following steps:

[0086] Step 1: Extract the three-phase voltage or current signal, perform sampling and discrete Fourier transform, and obtain the pre-estimated value of the phasor measurement of the fundamental wave of the three-phase signal

[0087]Step 1.1: Use the voltage transformer to extract the three-phase voltage signal x in the grid abc (t) or use the current transformer to extract the three-phase current signal x in the grid abc (t);

[0088] Step 1.2: With a fixed sampling frequency f s For three-phase voltage or current signal x abc (t) Sampling to obtain the discretization sequence x of the three-phase signal abc (n), where n=tf s , n represents the number of sampling points, f s Indicates the sampling frequency;

[0089] Step 1.3: With the same filter frequency ω 0 =2πf 0 / f s , where f 0 ...

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Abstract

The invention discloses a synchronous phasor measurement method based on clark transformation, and belongs to the field of electric power systems, and the method comprises: firstly extracting a three-phase signal, carrying out sampling and discrete fourier transformation to obtain a three-phase signal fundamental wave phasor measurement estimated value; premultipling a clark transformation matrix,performing dimension reduction processing, eliminating a negative double frequency component in the phasor measurement estimated value according to the mathematical transformation relation to obtaina DFT measurement result after a secondary pulsation error is eliminated; and finally establishing a Taylor dynamic phasor model in a time domain by utilizing the DFT (discrete fourier transformation)measurement result, calculating derivative values of all orders of time-varying characteristics of fundamental wave components of power signals, performing phase-shifting operation to obtain the phasor measurement result at the current moment of a power grid; and the problems that the precision and the stability of the synchronous phasor measurement are greatly influenced due to the secondary pulsation error caused by the negative double frequency component when dynamic oscillation exists in power environment are solved.

Description

technical field [0001] The invention belongs to the field of power systems and relates to a synchronized phasor measurement method based on Clarke transformation. Background technique [0002] With the access of a large number of distributed power sources, the unbalanced power of generators and loads and other factors, unpredictable dynamic changes have resulted in increasingly complex transmission and distribution network environments. The existing PMU devices operating on the network are subject to problems such as spectrum leakage and fence effects. The impact of the dynamic measurement performance is gradually exposed. Synchronous phasor measurement (Dynamic PhasorMeasurement Algorithm, DPMA) is the core of the software level of the PMU device, and the defect of its measurement accuracy will directly affect the advanced application of WAMS. [0003] Although traditional phasor measurement methods such as Kalman filter method, wavelet transform method, and discrete Fouri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R25/00
CPCG01R25/00
Inventor 符玲雷煜民潘晨玥熊思宇李小鹏麦瑞坤
Owner SOUTHWEST JIAOTONG UNIV
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