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Subsynchronous oscillation parameter detection method

A sub-synchronous oscillation and parameter detection technology, which is applied in the direction of complex mathematical operations, electrical digital data processing, special data processing applications, etc., can solve the problems of underutilization, large correction errors, etc.

Pending Publication Date: 2016-11-23
STATE GRID CORP OF CHINA +2
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Problems solved by technology

[0004] Commonly used window functions include Hanning window, Blackman window, Blackman-Harris window, Nuttall window, etc. The spectral sidelobe characteristics of different window functions have their own characteristics in suppressing spectrum leakage. Among the interpolation algorithms, widely used and highly accurate are Bispectral interpolation correction method, the bispectral interpolation algorithm uses the two spectral lines with the largest and second largest amplitudes near the peak frequency point, because the algorithm does not make full use of the information contained in the leaked spectral lines near the frequency point, resulting in correction errors bigger

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  • Subsynchronous oscillation parameter detection method
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  • Subsynchronous oscillation parameter detection method

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Embodiment Construction

[0052] The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0053] 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.

[0054] A method for detecting subsynchronous oscillation parameters provided by the present invention, such as figure 1 shown, including:

[0055] 101. Truncating the current signal to obtain...

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Abstract

The invention relates to a subsynchronous oscillation parameter detection method. The method comprises the following steps: cutting off a current signal to obtain sampling data with the length of N; establishing a four-item Rife-Vincent (III) window function with the length of N; determining an amplitude value of a dispersed frequency point corresponding to sampling data according to the four-item Rife-Vincent (III) window function; screening a maximal value of the dispersed frequency point in a subsynchronous frequency band; and revising the amplitude value, the frequency and the phase of a current signal by utilizing a spectral line corresponding to the maximal value of the dispersed frequency point and two spectral lines adjacent to the spectral line through adopting an interpolation correcting algorithm. The method provided by the invention can be used for effectively inhibiting frequency spectrum leakage by utilizing a four-item Rife-Vincent (III) window three-spectral-line interpolation FFT (Fast Fourier Transform) manner.

Description

technical field [0001] The invention relates to the field of power system operation and control, in particular to a subsynchronous oscillation parameter detection method. Background technique [0002] In order to improve the transmission capacity of long-distance transmission lines, series compensation and HVDC transmission technologies are widely used in the grid structure, which makes the power system face a greater risk of subsynchronous oscillation. With the gradual application of flexible AC transmission systems and large-scale grid-connected operation of new energy sources, the risk of subsynchronous oscillations in power systems has become more common and serious, seriously threatening the safe and stable operation of power systems. Accurate detection and analysis of the modal parameters of subsynchronous oscillation is conducive to mastering the real-time operation status of the power system, and it is also the basis for implementing various methods of suppressing an...

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Application Information

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IPC IPC(8): G06F17/14
CPCG06F17/142
Inventor 王茂海刘之滨郭骏宁剑李振李倩许勇汤飞张丽坤程春和
Owner STATE GRID CORP OF CHINA
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