Sub-synchronous oscillation parameter identification method for synchronous phasor data based on interpolation DFT

A technology of subsynchronous oscillation and parameter identification method, which is applied to the phase angle between voltage and current, measuring electricity, measuring devices, etc., and can solve the problem of inaccurate monitoring of subsynchronous oscillation parameters.

Active Publication Date: 2019-11-05
SICHUAN UNIV
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of inaccurate monitoring of subsynchronous oscillation parameters caused by the interaction of the electromechanical side of the power system. It provides a method for identifying subsynchronous oscillation parameters based

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  • Sub-synchronous oscillation parameter identification method for synchronous phasor data based on interpolation DFT
  • Sub-synchronous oscillation parameter identification method for synchronous phasor data based on interpolation DFT
  • Sub-synchronous oscillation parameter identification method for synchronous phasor data based on interpolation DFT

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Embodiment 1

[0070] Such as figure 1 As shown, the method of identifying subsynchronous oscillation parameters of synchronized phasor data based on interpolation DFT performs spectrum analysis on the phasor data obtained by the phasor measurement unit, so as to obtain the parameters of subsynchronous oscillation, including the following steps:

[0071] Step 1, using the phasor measurement unit in the wide-area measurement system to obtain real-time high-resolution waveform data;

[0072] Step 2: Perform Fourier transform on the time-domain waveform data in the phasor measurement unit to obtain synchronized phasor data, and use the reporting frequency f r , i.e. with spacing f pr = f p / f r Resample the synchrophasor data and obtain the reported synchrophasor X at the master station r (m), f p is the sampling frequency of the time-domain waveform data by the phasor measurement unit;

[0073] Step 3: Synchronize the synchronized phasor X in a rectangular window with a fixed window widt...

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Abstract

Disclosed is a sub-synchronous oscillation parameter identification method for synchronous phasor data based on interpolation DFT. The method comprises the following steps of 1, acquiring real-time high-resolution waveform data; 2, obtaining a synchronous phasor Xr(m) at a master station; 3, conducting a discrete Fourier transform operation on the synchronous phasor Xr(m) in a rectangular window to obtain a discrete Fourier transform spectrum Fr(k); 4, determining a frequency spectrum line km with the largest sub-synchronous oscillation amplitude; 5, constructing index phasors [k1, k2, k3, k4], introducing a frequency spectrum Frs(ki) of a second-order difference optical spectrum, and obtaining a simplified second-order difference ratio R; 6, calculating the values of a frequency fs and adamping coefficient alphas of sub-synchronous oscillation components; 7, conducting Hann window interception on the synchronous phasor Xr(m), executing the discrete Fourier transform operation, and conducting backstepping to obtain a calculation formula of the amplitude value As of the sub-synchronous oscillation components. By means of the method, the parameters of the sub-synchronous oscillationcomponents can be accurately identified, and the alleviation of the influence of sub-synchronous oscillation on system stability and equipment safety is facilitated.

Description

technical field [0001] The invention relates to the field of identifying subsynchronous oscillation parameters in a power grid so as to formulate electrical control strategies, in particular to an identification method for synchronous phasor data subsynchronous oscillation parameters based on interpolation DFT. Background technique [0002] Subsynchronous oscillation (SSO) is an abnormal phenomenon caused by the interaction of electromechanical side of power system. In recent years, with the rapid growth and application of renewable energy, there have been many power failure events related to subsynchronous oscillations worldwide. In these accidents, due to the severe subsynchronous oscillation, serious damage was caused to the rotor shafting of the turbogenerator, and even the safety and reliability of the power system were weakened. Therefore, monitoring and identifying subsynchronous oscillation is of great significance for formulating electrical control strategies and i...

Claims

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Application Information

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IPC IPC(8): G01R23/16G01R25/00G01R31/00G01R23/02G01R23/06
CPCG01R23/02G01R23/06G01R23/16G01R25/00G01R31/00
Inventor 杨晓梅王杨肖先勇张家宁郭林明
Owner SICHUAN UNIV
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