CN-122017454-A - Fault positioning method, device, equipment and medium for new energy power station conveying line

CN122017454ACN 122017454 ACN122017454 ACN 122017454ACN-122017454-A

Abstract

The embodiment of the invention discloses a method, a device, equipment and a medium for locating a fault of a new energy power station conveying line. The method comprises the steps of obtaining a conveying line fault information set and power system topology information, carrying out multi-channel modal decomposition on the conveying line fault information set, then carrying out self-adaptive signal decomposition to obtain a line fault frequency band information set, determining a line frequency band multi-dimensional fusion entropy set, carrying out traveling wave dispersion compensation on conveying line fault traveling wave information to obtain compensated conveying line fault traveling wave information, determining an initial line fault distance information set, generating a conveying line section fault probability set, generating line fault isolation instruction information, and controlling a corresponding breaker set on a conveying line to carry out conveying line disconnection processing. According to the method and the device, the problem of tripping in linkage caused by step voltage can be effectively solved, the accuracy of fault positioning of the new energy power station and the timeliness of timely fault isolation are improved, and the loss rate of the new energy power station is reduced.

Inventors

LIU JIAJUN
Jia mingzhu
Jia hongze
TIAN JUN
ZHU BIN
WU QIONGWEN

Assignees

江苏瑞盈智拓电力科技发展有限公司
南通贝卡迪电力科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260210

Claims (9)

1. A new energy power station conveying line fault positioning method comprises the following steps: acquiring a transmission line fault information set and power system topology information of a new energy power station power distribution network cooperative system through a data acquisition sensor set after clock synchronization; carrying out multi-channel modal decomposition processing on the conveying line fault information set to obtain a conveying line fault modal signal information set; performing self-adaptive signal decomposition on the conveying line fault modal signal information set to obtain a line fault frequency band information set; Determining the line frequency band multidimensional fusion entropy of each line fault frequency band information in the line fault frequency band information set to obtain a line frequency band multidimensional fusion entropy set; Carrying out traveling wave dispersion compensation on the traveling wave information of the transmission line fault information set according to the line frequency band multidimensional fusion entropy set and the topology information of the power system to obtain the traveling wave information of the transmission line fault after compensation; determining an initial line fault distance information set according to the compensated traveling wave information of the conveying line fault and the line frequency band multidimensional fusion entropy set; Generating a transmission line section fault probability set according to the line frequency band multidimensional fusion entropy set, the initial line fault distance information set and the power system topology information; Generating line fault isolation instruction information according to the fault probability set of the conveying line section, and controlling a corresponding breaker set on the conveying line to carry out conveying line disconnection processing according to the line fault isolation instruction information.
2. The method of claim 1, wherein the performing the multi-channel modal decomposition on the transport line fault information set to obtain a transport line fault modal signal information set includes: Carrying out fault information preprocessing on the conveying line fault information set to obtain a preprocessed conveying line fault information set; Carrying out time-frequency domain transformation on the preprocessed transmission line fault information set to obtain a line fault time-frequency domain information set; generating a line fault mask signal information set according to the line fault time-frequency domain information set and a preset initial fault parameter set; Adding the line fault mask signal information set to the preprocessed transmission line fault information set to obtain a fault mask signal information set; generating a fault mode signal information set according to the fault mask signal information set; Performing fault feature extraction on the fault modal signal information set by using a fault scattering feature extraction model to obtain a fault multi-order scattering feature vector set; Performing feature correlation fusion on the fault multi-order scattering feature vector set and the fault modal signal information set to obtain a fault fusion feature vector set; And inputting the fault fusion characteristic vector set to a full-connection layer to obtain a conveying line fault modal signal information set.
3. The method of claim 1, wherein said adaptively decomposing the transport line fault modal signal information set to obtain a line fault frequency band information set comprises: Determining a wavelet decomposition basis function according to the conveying line fault modal signal information set; determining the wavelet decomposition layer number according to the conveying line fault modal signal information set and the wavelet decomposition basis function; According to the wavelet decomposition basis function, carrying out signal decomposition based on wavelet decomposition layer numbers on the conveying line fault modal signal information set to obtain a line fault decomposition tree; Determining a line fault energy occupation ratio set and a line fault shannon entropy value set of each line fault leaf node included in the line fault decomposition tree; Performing redundant pruning treatment on each line fault leaf node according to the line fault energy occupation ratio set and the line fault shannon entropy value set to obtain a pruned line fault decomposition tree; And determining the frequency band signal set corresponding to each line fault leaf node included in the pruned line fault decomposition tree as a line fault frequency band information set.
4. The method of claim 1, wherein the determining the line-band multi-dimensional fusion entropy of each line-fault band information in the line-fault band information set, to obtain a line-band multi-dimensional fusion entropy set, comprises: normalizing the line fault frequency band information set to obtain a normalized line fault frequency band information set; Performing fault frequency band feature embedding on the normalized line fault frequency band information set to obtain a fault frequency band feature vector set; Determining a fault signal band distance information set of the fault band feature vector set; Generating a frequency band fuzzy entropy set according to the fault signal frequency band distance information set; generating a fault frequency band sample entropy set according to the fault frequency band characteristic vector set and the fault signal frequency band distance information set; Extracting a frequency band envelope signal from the line fault frequency band information set to obtain a fault frequency band envelope signal set; Determining an envelope probability distribution entropy set of the fault frequency band envelope signal set; Determining a fault frequency band energy entropy set of the normalized line fault frequency band information set; And carrying out weighted summation on the frequency band fuzzy entropy set, the fault frequency band sample entropy set, the envelope probability distribution entropy set and the fault frequency band energy entropy set to obtain a line frequency band multidimensional fusion entropy set.
5. The method of claim 1, wherein the performing traveling wave dispersion compensation on the traveling wave information of the transmission line fault in the transmission line fault information set according to the multi-dimensional fusion entropy set of the line frequency band and the topology information of the power system to obtain traveling wave information of the compensated transmission line fault, includes: performing high-pass filtering signal separation on a fault traveling wave signal information set included in the conveying line fault information set to obtain target fault traveling wave signal information; constructing a traveling wave deconvolution filter function according to the topology information of the power system; and carrying out traveling wave dispersion compensation on the target fault traveling wave signal information set according to the traveling wave deconvolution filter function to obtain the fault traveling wave information of the compensated conveying line.
6. The method of claim 1, wherein the generating a delivery line segment fault probability set from the line band multi-dimensional fusion entropy set, the initial line fault distance information set, and the power system topology information comprises: Inputting the line frequency band multidimensional fusion entropy set and the power system topology information into a fault topological graph convolution network included in a fault time sequence graph convolution positioning model to obtain a power transmission line topology feature vector set, wherein the fault time sequence convolution positioning model further comprises a fault time sequence positioning network; inputting the topological feature vector set of the power transmission line to the fault time sequence positioning network to obtain a fault time sequence feature vector set; Performing feature decision screening processing on the topological feature vector set of the power transmission line and the fault time sequence feature vector set to obtain a screened fault feature vector set; And carrying out positioning update processing on the initial line fault distance information set according to the filtered fault characteristic vector set to obtain a conveying line section fault probability set.
7. A new energy power station transmission line fault locating device, comprising: The acquisition unit is configured to acquire a transmission line fault information set and power system topology information of the new energy power station power distribution network cooperative system through the data acquisition sensor set after clock synchronization; The multichannel modal decomposition unit is configured to perform multichannel modal decomposition processing on the conveying line fault information set to obtain a conveying line fault modal signal information set; the self-adaptive signal decomposition unit is configured to perform self-adaptive signal decomposition on the conveying line fault modal signal information set to obtain a line fault frequency band information set; A first determining unit configured to determine a line-band multidimensional fusion entropy of each line-fault band information in the line-fault band information set, to obtain a line-band multidimensional fusion entropy set; the traveling wave dispersion compensation unit is configured to perform traveling wave dispersion compensation on the traveling wave information of the transmission line fault in the transmission line fault information set according to the line frequency band multidimensional fusion entropy set and the power system topology information, so as to obtain the traveling wave information of the transmission line fault after compensation; a second determining unit configured to determine an initial line fault distance information set according to the compensated transport line fault traveling wave information and the line frequency band multidimensional fusion entropy set; A generating unit configured to generate a transmission line segment fault probability set according to the line frequency band multidimensional fusion entropy set, the initial line fault distance information set and the power system topology information; and the conveying line disconnection unit is configured to generate line fault isolation instruction information according to the conveying line section fault probability set and control a corresponding breaker set on a conveying line to conduct conveying line disconnection processing according to the line fault isolation instruction information.
8. An electronic device, comprising: one or more processors; a storage device having one or more programs stored thereon, When executed by the one or more processors, causes the one or more processors to implement the method of any of claims 1-6.
9. A computer readable medium having stored thereon a computer program, wherein the computer program, when executed by a processor, implements the method of any of claims 1-6.

Description

Fault positioning method, device, equipment and medium for new energy power station conveying line Technical Field The embodiment of the disclosure relates to the technical field of computers, in particular to a method, a device, equipment and a medium for positioning a fault of a new energy power station conveying line. Background Under the drive of a double-carbon target, the scale of new energy power stations such as wind power, photovoltaic and the like is continuously enlarged, the power grid structure is increasingly complex, and the new energy power stations become an important component of a power supply system, but single-phase grounding faults caused by the rapid increase of the capacitance current of the power grid to the ground are difficult to quickly isolate frequently, so that the power resource consumption of the power grid is larger. The conveying line is a key channel for connecting the new energy power station and the power distribution network, and the stable operation of the conveying line directly influences the power generation efficiency of the power station and the power supply reliability of the power distribution network. For the fault positioning method of the new energy power grid transmission line, a mode is generally adopted, wherein power station power information (such as zero sequence voltage and traveling wave signals) of a new energy power station power distribution network cooperative system is obtained. And then, carrying out fault feature extraction on the power information of the power station through a harmonic analysis algorithm to obtain a power fault signal set. And then, carrying out fault positioning on the power fault signal set through a traveling wave algorithm to obtain line fault position information. And finally, controlling the corresponding breaker set on the conveying line to carry out conveying line disconnection processing according to the line fault position information. However, in practice, when the fault location is performed on the new energy power station transmission line by adopting the mode, the technical problems often exist that as the data of the power station power information of the new energy power station and the power grid are only obtained in a single and one-sided way, a great amount of mode mixed information exists in the power fault information extracted by the harmonic analysis algorithm, the quality of the power fault signal is lower, and the high-frequency component is gradually annihilated along with the distance of the transmission line when the fault location is performed by the traveling wave algorithm, the traveling wave crest is offset, the fault location accuracy of the transmission line is lower, the timeliness of isolating the power fault is reduced, the loss of the new energy power station is higher, and the line loss of the transmission line is higher. The above information disclosed in this background section is only for enhancement of understanding of the background of the disclosed concept and, therefore, it may contain information that does not form the prior art that is known to those of ordinary skill in the art in this country. Disclosure of Invention The disclosure is in part intended to introduce concepts in a simplified form that are further described below in the detailed description. The disclosure is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter. Some embodiments of the present disclosure propose new energy power station transmission line fault locating methods, apparatuses, devices and mediums to address one or more of the technical problems mentioned in the background section above. According to the first aspect, some embodiments of the present disclosure provide a new energy grid transmission line fault location method, which includes acquiring a transmission line fault information set and electric power system topology information of a new energy power station power distribution network collaborative system through a data acquisition sensor set after clock synchronization, performing multi-channel modal decomposition processing on the transmission line fault information set to obtain a transmission line fault modal signal information set, performing adaptive signal decomposition on the transmission line fault modal signal information set to obtain a line fault frequency band information set, determining a line frequency band multi-dimensional fusion entropy of each line fault frequency band information in the line fault frequency band information set to obtain a line frequency band multi-dimensional fusion entropy set, performing traveling wave dispersion compensation on transmission line fault traveling wave information of the transmission line fault information set according to the line frequency band multi-dimensional fusion entropy set and the electric power system topology