Fast extraction algorithm for faulty power frequency component of compensated power system
A power frequency component and power system technology, which is applied in calculation, complex mathematical operations, electrical digital data processing, etc., can solve the problems of different selection of noise models, lack of universality of least squares algorithm, power frequency amplitude and phase errors major issues
Pending Publication Date: 2018-10-12
STATE GRID TIANJIN ELECTRIC POWER +1
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Problems solved by technology
Although the half-wave Fourier algorithm only needs half-cycle sampling data, it is more affected by the attenuated DC component and fractional harmonics, and the half-wave Fourier algorithm cannot filter out even-numbered harmonics, so the calculated The magnitude and phase errors of the power frequency are larger
The least squares algorithm has very flexible requirements on the data window length, good filtering performance, and high precision, but it is difficult to choose the noise model of the algorithm
The least squares algorithm is not universal in the selection of noise models: in different systems, the noise models may be different, even in the same system, when different faults occur, the selection of noise models may also be different
The Kalman filtering algorithm is less affected by random interference and measurement noise, but requires complex matrix operations, and the selection of filtering parameters of the algorithm is based on the analysis of statistical characteristics of noise-containing signals, which is difficult to obtain
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Embodiment Construction
[0077] Embodiments of the present invention are described in further detail below in conjunction with the accompanying drawings:
[0078] A fast extraction algorithm for fault power frequency components in a compensated power system, such as figure 1 shown, including the following steps:
[0079] Step 1. Obtain the original signal of the power frequency component of the power system through information acquisition or data acquisition;
[0080] The Fourier algorithm, which is a commonly used extraction algorithm for power frequency components in power systems, is greatly affected by the attenuation of DC components, so assume that the original signal is as shown in formula (1), and then add Gaussian white noise with a signal-to-noise ratio of 60;
[0081]
[0082] Step 2, performing low-pass filter processing on the original signal of the power frequency component of the power system;
[0083] In this embodiment, the cutoff frequency of the low-pass filter is set to 1000 H...
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The present invention relates to a fast extraction algorithm for a faulty power frequency component of a compensated power system. The technical feature of the algorithm comprises the following steps:Step 1, obtaining an original signal of a power frequency component of a power system; Step 2, performing low-pass filtering processing; Step 3, obtaining a sampled value x; Step 4, constructing a sample matrix R; Step 5, determining the effective rank p of the sample matrix R; Step 6, using a Lagrangian multiplier method-based partial derivative solving method to obtain AR model parameters corresponding to the Prony algorithm; and Step 7, compensating the obtained AR model parameters to obtain more accurate AR model parameters. According to the algorithm provided by the present invention, calculation accuracy and efficiency are effectively improved, and the simulation results show that the algorithm can accurately extract the faulty power frequency component of the power system within half cycle (10ms).
Description
technical field [0001] The invention belongs to the technical field of electric power system digital signal processing, in particular to a fast extraction algorithm of a power frequency component of a fault in a compensated electric power system. Background technique [0002] Power system signal processing mainly involves the extraction of power frequency components. For example, in the fields of system state estimation, stability control, fault analysis and relay protection in power systems, power frequency components need to be calculated and extracted. Especially in the field of relay protection, it is required to quickly and accurately extract power frequency components and shorten the protection action time, so as to meet the requirements of modern power systems for fast and reliable relay protection. [0003] At present, in the relay protection of power system, the methods widely used include full-wave Fourier algorithm, half-wave Fourier algorithm, least square algori...
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Login to View More IPC IPC(8): G06F17/50G06F17/18
CPCG06F17/18G06F30/20
Inventor 高强伟庞宗永魏然黄旭宋建永杨勇志鞠林陈哲星孙广志王玉辉朱汉卿史钧杰刘伟李博彤牛嵩迪
Owner STATE GRID TIANJIN ELECTRIC POWER