CN117648540A - Electric power signal extraction and correction method under complex interference environment - Google Patents
Electric power signal extraction and correction method under complex interference environment Download PDFInfo
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Abstract
The invention provides a power signal extraction and correction method in a complex interference environment, which comprises the following steps: step (1): collecting the power signal; step (2): constructing a matrix A; step (3): constructing a track matrix for the power signals; step (4): constructing a Hamiltonian matrix; step (5): constructing a Xin Zhengjiao matrix Q through a Householder transformation; step (6): calculating the eigenvalue of the matrix A; step (7): judging whether the power signal needs to be corrected according to the characteristic value of the matrix A, and if so, entering a step (8); if not, reserving the corresponding power signal; step (8): correcting the abnormal signal according to the power signals of the sampling points before and after the abnormal signal, and supplementing the current signal sequence. The invention provides a method for extracting and correcting power signals in a complex interference environment, which is used for effectively and reliably extracting effective information of the power signals and carrying out information correction on abnormal power information.
Description
Technical Field
The invention belongs to the technical field of power signal analysis, and particularly relates to a power signal extraction and correction method in a complex interference environment.
Background
With the continuous development of science and technology, people use electric energy more and more widely, and in order to ensure safe and reliable work of power equipment, power lines and the like, work information and the like of the people need to be collected for detection, monitoring, fault judgment and the like. However, many electric power signal acquisition working environments are complex and changeable, interference signals are easy to acquire, and effective and reliable extraction of current signals is needed, so that accuracy of analysis results is guaranteed.
The invention provides a power signal extraction and correction method under a complex interference environment, which is used for extracting characteristic values of characteristic matrixes of acquired information, judging whether an abnormal signal exists in a power signal according to the magnitude of the characteristic values, and then effectively correcting the abnormal power signal to improve the accuracy of the acquired signal.
Disclosure of Invention
The invention provides a method for extracting and correcting power signals in a complex interference environment, which is used for effectively and reliably extracting effective information of the power signals and carrying out information correction on abnormal power information.
The invention particularly relates to a power signal extraction and correction method in a complex interference environment, which comprises the following steps:
step (1): collecting the power signal;
step (2): constructing a matrix A;
step (3): constructing a track matrix for the power signals;
step (4): constructing a Hamiltonian matrix;
step (5): constructing a Xin Zhengjiao matrix Q through a Householder transformation;
step (6): calculating the eigenvalue of the matrix A;
step (7): judging whether the power signal needs to be corrected according to the characteristic value of the matrix A, and if so, entering a step (8); if not, reserving the corresponding power signal;
step (8): correcting the abnormal signal according to the power signals of the sampling points before and after the abnormal signal, and supplementing the current signal sequence.
The method for constructing the track matrix for the power signal comprises the following steps:
where d is the embedding dimension, x (n) =x 1 ,x 2 ,…,x n N is the power signal length, τ is the delay time, m=n- (d-1).
The method for calculating the embedding dimension d comprises the following steps:
firstly, extracting the power signal frequency information;
secondly, carrying out normalization processing on the frequency information;
again, it is determined whether the normalized frequency is less than 10 -3 If so, the method comprises, if so,if not, add>Wherein F is s For sampling frequency f max Is the frequency maximum.
The algorithm for constructing the matrix A is as follows: a=x T X。
The method for constructing the Hamiltonian matrix comprises the following steps:
the method for constructing the Xin Zhengjiao matrix Q through the Householder transformation is as follows:
b is an upper triangular matrix.
The method for calculating the eigenvalue of the matrix A comprises the following steps:
first, a characteristic value lambda of B is calculated 1 ，λ 2 ，…，λ d ；
Second, calculate the matrixCharacteristic value of A
The specific method for judging whether the power signal needs to be reserved according to the eigenvalue of the matrix A comprises the following steps:
respectively and sequentially judging whether the characteristic value of the matrix A is larger than a characteristic value reference value, if so, correcting the corresponding power signal; if not, the corresponding power signal is reserved.
The specific method for correcting the abnormal signal according to the power signals of the sampling points before and after the abnormal signal comprises the following steps:
and extracting the average value of the power signal valid at the last sampling point and the power signal valid at the next sampling point as the corrected power signal to replace the abnormal power signal.
Compared with the prior art, the beneficial effects are that: the power signal extraction and correction method is used for extracting the characteristic matrix of the acquired information, extracting the characteristic value of the characteristic matrix, judging whether the power signal has an abnormal signal according to the magnitude of the characteristic value, and then effectively correcting the abnormal power signal to improve the accuracy of the acquired signal.
Drawings
Fig. 1 is a flowchart of a power signal extraction and correction method in a complex interference environment according to the present invention.
Detailed Description
The following describes a specific embodiment of the power signal extraction and correction method in a complex interference environment in detail with reference to the accompanying drawings.
As shown in fig. 1, the power signal extraction and correction method of the present invention includes the steps of:
step (1): collecting the power signal;
step (2): constructing a track matrix for the power signalWhere d is the embedding dimension, x (n) =x 1 ,x 2 ,…,x n N is the electric powerSignal length, τ is delay time, m=n- (d-1);
step (3): building a matrix a=x T X；
Step (4): construction of Hamiltonian matrix
Step (5): construction of Xin Zhengjiao matrix by Householder transformationB is an upper triangular matrix;
step (6): calculating eigenvalues of matrix A:
first, a characteristic value lambda of B is calculated 1 ，λ 2 ，…，λ d ；
Next, the eigenvalues of matrix a are calculated
Step (7): judging whether the power signal needs to be corrected according to the characteristic value of the matrix A, and if so, entering a step (8); if not, reserving the corresponding power signal;
step (8): correcting the abnormal signal according to the power signals of the sampling points before and after the abnormal signal, and supplementing the current signal sequence.
Respectively and sequentially judging whether the characteristic value of the matrix A is larger than a characteristic value reference value, if so, correcting the corresponding power signal; if not, the corresponding power signal is reserved.
The method for calculating the embedding dimension d comprises the following steps:
firstly, extracting the power signal frequency information;
secondly, carrying out normalization processing on the frequency information;
again, it is determined whether the normalized frequency is less than 10 -3 If so, the method comprises, if so,if not, add>Wherein F is s For sampling frequency f max Is the frequency maximum.
The specific method for judging whether the electric power signal needs to be corrected according to the characteristic value of the matrix A comprises the following steps:
respectively and sequentially judging whether the characteristic value of the matrix A is larger than a characteristic value reference value, if so, correcting the corresponding power signal; if not, the corresponding power signal is reserved.
The specific method for correcting the abnormal signal according to the power signals of the sampling points before and after the abnormal signal comprises the following steps:
and extracting the average value of the power signal valid at the last sampling point and the power signal valid at the next sampling point as the corrected power signal to replace the abnormal power signal.
Finally, it should be noted that the above-mentioned embodiments are merely illustrative of the technical solution of the invention and not limiting thereof. It will be understood by those skilled in the art that modifications and equivalents may be made to the particular embodiments of the invention, which are within the scope of the claims appended hereto.
Claims (9)
1. The power signal extraction and correction method in the complex interference environment is characterized by comprising the following steps of:
step (1): collecting the power signal;
step (2): constructing a track matrix for the power signals;
step (3): constructing a matrix A; the method comprises the steps of carrying out a first treatment on the surface of the
Step (4): constructing a Hamiltonian matrix;
step (5): constructing a Xin Zhengjiao matrix Q through a Householder transformation;
step (6): calculating the eigenvalue of the matrix A;
step (7): judging whether the power signal needs to be corrected according to the characteristic value of the matrix A, and if so, entering a step (8); if not, reserving the corresponding power signal;
step (8): correcting the abnormal signal according to the power signals of the sampling points before and after the abnormal signal, and supplementing the current signal sequence.
2. The method for extracting a power signal in a complex interference environment according to claim 1, wherein the method for constructing a track matrix for the power signal is as follows:where d is the embedding dimension, x (n) =x 1 ,x 2 ,…,x n N is the power signal length, τ is the delay time, m=n- (d-1).
3. The method for extracting and correcting a power signal in a complex interference environment according to claim 2, wherein the method for calculating the embedding dimension d is as follows:
firstly, extracting the power signal frequency information;
secondly, carrying out normalization processing on the frequency information;
again, it is determined whether the normalized frequency is less than 10 -3 If so, the method comprises, if so,if not, add>Wherein F is s For sampling frequency f max Is the frequency maximum.
4. The method for extracting and correcting a power signal in a complex interference environment according to claim 3, wherein the algorithm for constructing the matrix a is as follows: a=x T X。
5. A complex as defined in claim 4The method for extracting and correcting the power signal in the noise interference environment is characterized in that the method for constructing the Hamiltonian matrix comprises the following steps:
6. the method for extracting and correcting power signals in a complex interference environment according to claim 5, wherein the method for constructing the Xin Zhengjiao matrix Q by using a householder transformation is as follows:b is an upper triangular matrix.
7. The method for extracting and correcting power signals in a complex interference environment according to claim 6, wherein the method for calculating the eigenvalue of the matrix a is as follows:
first, a characteristic value lambda of B is calculated 1 ，λ 2 ，…，λ d ；
Next, the eigenvalues of matrix a are calculated
8. The method for extracting and correcting a power signal in a complex interference environment according to claim 7, wherein the specific method for judging whether the power signal needs to be retained according to the eigenvalue of matrix a is as follows: respectively and sequentially judging whether the characteristic value of the matrix A is larger than a characteristic value reference value, if so, correcting the corresponding power signal; if not, the corresponding power signal is reserved.
9. The method for extracting and correcting the power signal in the complex interference environment according to claim 8, wherein the specific method for correcting the abnormal signal according to the power signal at the sampling points before and after the abnormal signal is as follows: and extracting the average value of the power signal valid at the last sampling point and the power signal valid at the next sampling point as the corrected power signal to replace the abnormal power signal.
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| CN202311647229.XA CN117648540A (en) | 2023-12-04 | 2023-12-04 | Electric power signal extraction and correction method under complex interference environment |
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