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Power distribution network synchronous phasor measuring method based on Prony algorithm

A technology of synchronized phasor measurement and synchronized phasor, which is applied in complex mathematical operations and other directions, can solve the problems of power frequency signal separation, Fourier transform cannot separate power frequency signals, affect the measurement accuracy of power frequency signals, etc., and achieve the effect of precise measurement

Pending Publication Date: 2018-08-28
NANJING UNIV OF SCI & TECH
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Problems solved by technology

After a system failure occurs, an attenuated DC component with a large amplitude will be generated. The Fourier transform cannot separate the attenuated DC component from the power frequency signal, and the attenuated DC component will affect the measurement accuracy of the power frequency signal.
When a fault occurs in the power system, the system will generate a certain degree of non-integral harmonics. For this type of signal, the Fourier transform cannot be well separated from the power frequency signal.

Method used

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  • Power distribution network synchronous phasor measuring method based on Prony algorithm
  • Power distribution network synchronous phasor measuring method based on Prony algorithm
  • Power distribution network synchronous phasor measuring method based on Prony algorithm

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Embodiment 1

[0112] The signal model is selected for verification in four cases: normal power frequency, non-integral harmonic, attenuated low frequency component, and attenuated DC component. In order to facilitate the comprehensive comparison of the Prony algorithm in DSP, the Prony algorithm in Matlab and the FFT algorithm, Matlab is used to generate the sampling data of the signal model in the experiment, the sampling frequency is 1200Hz, and the calculation points are 24 sampling points.

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Abstract

The invention discloses a power distribution network synchronous phasor measuring method based on a Prony algorithm. The method specifically includes the following steps of establishing a Prony algorithm calculating model according to sampling data of a synchronous phasor measuring device, and obtaining a power distribution network synchronous phasor through the Prony algorithm. When the power distribution network synchronous phasor is calculated through the Prony algorithm, a differential equation coefficient in the Prony algorithm is obtained through an SVD algorithm, obtaining a root of a polynomial is converted into obtaining a matrix feature value, the time for obtaining a model coefficient item is shortened according to features of a Vandermonde matrix, and the amplitude, phase position, damping factor and frequency in the model are obtained. Under the condition that a power distribution network is greatly influenced by frequency fluctuation, non-integral harmonic waves, attenuation low frequency components, attenuation DC components and the like, the synchronous phasor can be precisely measured.

Description

technical field [0001] The invention belongs to the technical field of distribution automation, in particular to a method for measuring distribution network synchronized phasors based on a Prony algorithm. Background technique [0002] The extensive access of distributed energy sources makes the grid structure of the distribution network more and more complex. At present, the degree of informatization and automation of the distribution network is low. Using the synchronized phasor data of the PMU can monitor the distribution network more effectively. However, the traditional PMU measurement algorithm is mainly designed for the transmission network, and the Fourier algorithm is used for phasor calculation. In the distribution network, it is greatly affected by frequency fluctuations, non-integral harmonics, attenuating low-frequency components, and attenuating DC components. Fourier transform cannot meet the requirements. Require. [0003] The calculation window length of th...

Claims

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Application Information

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IPC IPC(8): G06F17/11G06F17/15
CPCG06F17/11G06F17/15
Inventor 王宝华刘洋饶新亮张曼王冰冰
Owner NANJING UNIV OF SCI & TECH
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