CN115688492A - Digital modeling and intelligent detection method for power secondary equipment - Google Patents
Digital modeling and intelligent detection method for power secondary equipment Download PDFInfo
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Abstract
The invention discloses a digital modeling and intelligent detection method for secondary power equipment, which comprises the following steps: extracting electrical signals, physical positions and information attributes of the secondary power equipment, constructing a digital modeling label of the secondary power equipment based on the electrical signals, the physical positions and the information attributes of the secondary power equipment, and constructing a plurality of community digital models of the secondary power equipment based on the identity of the digital modeling label of the secondary power equipment; and sequentially making an optimal community test case of each community digital model in each community digital model through a neural network according to the digital modeling label of the power secondary equipment. According to the method, the test cases are evaluated by using the neural network in the local detection, so that the best test case which ensures that the community test case has the highest test coverage in the community digital model is selected, the community digital model is uniformly detected, the power equipment is uniformly detected by using the relevance of the power system, the detection efficiency is improved, and the accuracy of fault location is improved.
Description
Technical Field
The invention relates to the technical field of power grid modeling, in particular to a digital modeling and intelligent detection method for electric power secondary equipment.
Background
The national smart grid industry base is advanced particularly in the aspects of relay protection and power system automation industry, and 80% of related manufacturing plants in China are gathered. But under the large environment that the population dividend disappears and the labor cost rises, the method has great restriction on the international competitiveness of the manufacturing industry in China. The power system automation industry is the same as most manufacturing industries, and the 'industry 4.0' is a necessary route which cannot be bypassed in development, so that the dependence on labor force needs to be reduced to a greater extent, and the personalized requirements of users are met, so that the search for an advanced technology which can replace manpower, improve the production efficiency, improve the product quality and ensure the product consistency is imperative.
The prior art CN202111280411.7 discloses a digital modeling and intelligent detection system for electric power secondary equipment, which comprises digital modeling, artificial intelligent software for generating software and hardware configuration of an automatic detection system, and closed-loop intelligent detection, and applies the idea of a digital main line to the intelligent production detection process of electric power system secondary equipment manufacturers, and the digital model of the secondary equipment modeled from the bottom layer by the same syntax semantics has the same data source, so that the digital model has the description of standard development, and is undistorted in step-by-step transmission and traceable. A digital mainline is a method by which unified data access can be created using a single real source. When used throughout an enterprise, this approach can map a reliable set of data to different functions, thereby achieving consistency and enhancing collaboration. After the data set is started, the data can be synchronized in real time, so that upstream and downstream information can be available to all users, product innovation is promoted, the process is optimized, and efficiency and worker productivity are improved. Although the prior art has certain advantages in the aspects of equipment modeling and intelligent detection, some defects also exist, for example, each power equipment is subjected to global digital modeling to separate the equipment relevance of a power system, so that the integrity of the intelligent detection is lost, the accuracy is reduced when a circuit fault is positioned, meanwhile, the global detection uses a test case to adopt artificial setting, the random subjectivity is strong, and the accuracy of the fault positioning is further reduced.
Disclosure of Invention
The invention aims to provide a digital modeling and intelligent detection method for power secondary equipment, which aims to solve the technical problems that in the prior art, each power equipment carries out global digital modeling, the equipment relevance of a power system is cut off, so that the intelligent detection loses integrity, the accuracy is reduced during circuit fault location, meanwhile, the global detection adopts artificial setting by using a test case, the random subjectivity is strong, and the accuracy of fault location is further reduced.
In order to solve the technical problems, the invention specifically provides the following technical scheme:
a digital modeling and intelligent detection method for electric power secondary equipment comprises the following steps:
the method comprises the following steps of S1, extracting electrical signals, physical positions and information attributes of the secondary power equipment, constructing a digital modeling label of the secondary power equipment based on the electrical signals, the physical positions and the information attributes of the secondary power equipment, and constructing a plurality of community digital models of the secondary power equipment based on the identity of the digital modeling label of the secondary power equipment;
s2, sequentially making an optimal community test case of each community digital model in each community digital model through a neural network according to a digital modeling label of power secondary equipment so as to ensure that the community test case has the highest test coverage in the community digital model and realize the uniform detection of the community digital model;
and S3, inputting display data of the power secondary equipment in the community digital model applied with the optimal community test case into a preset detection model to position a power failure point in the community digital model.
As a preferred aspect of the present invention, the constructing a digital modeling tag of the electric power secondary device based on the electric signal, the physical location, and the information attribute of the electric power secondary device includes:
performing principal component analysis on the electrical signal, the physical position and the information attribute to obtain a plurality of digital characteristics, and performing weighted modeling on each digital characteristic to obtain a characteristic network model;
and performing minimum spanning tree decomposition evolution on the characteristic network model to obtain a dynamic network model, and performing topological feature extraction on the dynamic network model to obtain a topological feature vector as a digital modeling label of the power secondary equipment.
As a preferable aspect of the present invention, the constructing of the feature network model includes:
taking each digital feature as a network topology node of a feature network model, and arranging a topology connecting edge between any two digital features;
and taking the Euclidean distance between any two digital characteristics as the edge weight of the topological connection between the corresponding network topology nodes to obtain the characteristic network model.
As a preferred scheme of the present invention, the evolution expression of the dynamic network model is:
T i =MST(G cn 0 - G cn i-1 )：
G cn i = G cn i-1 + T i ；
in the formula, T i Is a firstiMinimum spanning tree, G, by secondary evolution cn i-1 Is a firstiDynamic network model obtained by secondary evolution, G cn 0 As a feature network model, G cn 0 - G cn i-1 Is G cn 0 And G cn i-1 MST is the minimum spanning tree generation algorithm,ifor the counting term of the number of evolutions,i∈[2,N]n is the total number of evolutions, G cn N Is a dynamic network model;
wherein, T 1 =MST(G cn 0 )，G cn 1 = T 1 ；
In the formula, T 1 Minimum spanning Tree, G, for evolution 1 cn 1 The dynamic network model obtained for the 1 st evolution.
As a preferable aspect of the present invention, the building of the plurality of community digital models of the electric power secondary device based on the identity of the digital modeling tags of the electric power secondary device includes:
clustering operation is carried out on each electric power secondary device based on the digital modeling label so as to classify each electric power secondary device to a plurality of device communities, and digital modeling is carried out on each device community by using the digital modeling label corresponding to the community center point so as to obtain a plurality of community digital models.
As a preferable aspect of the present invention, the sequentially making an optimal community test case of each community digital model in each community digital model through a neural network according to the digital modeling label of the power secondary device includes:
selecting a plurality of groups of test cases and a plurality of electric power secondary devices, and applying each group of test cases to each electric power secondary device in sequence to monitor the test accuracy and the test matching degree;
selecting a test case with the highest test accuracy and test matching degree for each electric power secondary device, extracting topological characteristic vectors of the electric power secondary devices as input items of a neural network, and using the test case as an output item of the neural network;
and performing network training on the input items and the output items by utilizing a neural network to obtain a test case matching model, inputting the digital modeling label of each community digital model into the test case matching model to obtain a test case of which each community digital model achieves the highest test accuracy and test matching degree, and taking the test case as the optimal community test case of each community digital model.
As a preferred aspect of the present invention, the inputting display data of the power secondary devices in the community digital model to which the optimal community test case is applied to a preset detection model to locate the power failure point in the community digital model includes:
applying the optimal community test case to the community digital model, and acquiring display data of the power secondary equipment in the community digital model;
and outputting the display data to a preset detection model, judging the operation state of each electric power secondary device by the preset detection model, and calibrating the physical position of the electric power secondary device of which the operation state is judged to be the fault state as an electric power fault point.
As a preferred scheme of the present invention, the preset detection model is constructed by training a classifier model with big data.
As a preferred aspect of the present invention, the topological feature vector includes a maximum degree, an average degree, entropy, energy, an average degree of association, an average shortest path length, and a flat clustering coefficient.
As a preferable aspect of the present invention, the clustering operation is set to be a small community cluster to ensure identity of the digital modeling labels of the power secondary devices in the community digital model.
Compared with the prior art, the invention has the following beneficial effects:
according to the method, local digital modeling is carried out on each power secondary device, the device relevance of a power system during modeling is guaranteed, the power integrity of intelligent detection is further guaranteed, the circuit fault location accuracy is improved, meanwhile, the test cases are evaluated by the local detection through the neural network so as to select the best test case which guarantees the highest test coverage of the community test case in the community digital model, so that the community digital model is uniformly detected, the power devices are uniformly detected through the power system relevance, the detection efficiency is improved, and meanwhile, the fault location accuracy is further improved.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
Fig. 1 is a flowchart of a digital modeling and intelligent detection method for power secondary equipment according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
As shown in fig. 1, the invention provides a digital modeling and intelligent detection method for electric power secondary equipment, which comprises the following steps:
the method comprises the following steps of S1, extracting an electrical signal, a physical position and an information attribute of the electric power secondary equipment, constructing a digital modeling label of the electric power secondary equipment based on the electrical signal, the physical position and the information attribute of the electric power secondary equipment, and constructing a plurality of community digital models of the electric power secondary equipment based on the identity of the digital modeling label of the electric power secondary equipment;
the digital modeling label of the electric power secondary equipment is constructed based on the electric signal, the physical position and the information attribute of the electric power secondary equipment, and comprises the following steps:
performing principal component analysis on the electrical signal, the physical position and the information attribute to obtain a plurality of digital characteristics, and performing weighted modeling on each digital characteristic to obtain a characteristic network model;
and performing minimum spanning tree decomposition and evolution on the characteristic network model to obtain a dynamic network model, and performing topological feature extraction on the dynamic network model to obtain a topological feature vector as a digital modeling label of the power secondary equipment.
The construction of the characteristic network model comprises the following steps:
taking each digital feature as a network topology node of a feature network model, and arranging a topology connecting edge between any two digital features;
and taking the Euclidean distance between any two digital characteristics as the edge weight of the topological connection between the corresponding network topology nodes to obtain a characteristic network model.
The evolution expression of the dynamic network model is as follows:
T i =MST(G cn 0 - G cn i-1 )：
G cn i = G cn i-1 + T i ；
in the formula, T i Is as followsiMinimum spanning tree, G, by secondary evolution cn i-1 Is as followsiDynamic network model obtained by secondary evolution, G cn 0 As a feature network model, G cn 0 - G cn i-1 Is G cn 0 And G cn i-1 The graph difference operation of (1), MST is a minimum spanning tree generation algorithm,ifor the counting term of the number of evolutions,i∈[2,N]n is the total number of evolutions, G cn N Is a dynamic network model;
wherein, T 1 =MST(G cn 0 )，G cn 1 = T 1 ；
In the formula, T 1 Minimum spanning Tree, G, for evolution 1 cn 1 The dynamic network model obtained for the 1 st evolution.
The method for constructing a plurality of community digital models of the electric power secondary equipment based on the identity of the digital modeling labels of the electric power secondary equipment comprises the following steps:
clustering operation is carried out on each electric power secondary device based on the digital modeling label so as to classify each electric power secondary device to a plurality of device communities, and digital modeling is carried out on each device community by using the digital modeling label corresponding to the community center point so as to obtain a plurality of community digital models.
The method comprises the steps of setting digital modeling labels on power secondary equipment, enabling the power secondary equipment with strong relevance to have the same or similar digital modeling labels, enabling the power secondary equipment with the strong relevance to be located in the same community based on polarity clustering operation of the digital modeling labels, enabling the power secondary equipment with the strong relevance to be placed in the same community, establishing the same community digital model for the community to perform subsequent fault analysis, achieving unified detection on the power equipment through the power system relevance, and improving detection efficiency.
In the embodiment, the digital modeling label performs principal component analysis on the electrical signal, the physical position and the information attribute to obtain a plurality of digital characteristics, and performs weighted modeling on each digital characteristic to obtain a characteristic network model, so that the dimension reduction processing of the digital characteristics is realized and the important characteristics are reserved;
the method comprises the steps of performing minimum spanning tree decomposition evolution on a characteristic network model to obtain a dynamic network model, performing topological feature extraction on the dynamic network model to obtain a topological feature vector as a digital modeling label of the power secondary equipment, performing topological construction on the remaining important features, converting the remaining important features into topological features, and performing feature association on the remaining important features through topological quantization, so that the established digital modeling label performs association characterization on the important features in the electrical signals, the physical positions and the information attributes, namely converting actual data features into topological expressions, and expressing the important features in the discrete electrical signals, the physical positions and the information attributes by using a topological structure, thereby simplifying expression complexity and discrete type.
S2, sequentially making an optimal community test case of each community digital model in each community digital model through a neural network according to a digital modeling label of power secondary equipment so as to ensure that the community test case has the highest test coverage in the community digital model and realize the uniform detection of the community digital model;
the method comprises the following steps of sequentially making an optimal community test case of each community digital model in each community digital model through a neural network according to a digital modeling label of power secondary equipment, wherein the optimal community test case comprises the following steps:
selecting a plurality of groups of test cases and a plurality of electric secondary devices, and applying each group of test cases to each electric secondary device in sequence to monitor test accuracy and test matching degree;
selecting a test case with the highest test accuracy and test matching degree for each electric power secondary device, extracting topological characteristic vectors of the electric power secondary devices as input items of the neural network, and using the test case as output items of the neural network;
and performing network training on the input items and the output items by utilizing a neural network to obtain a test case matching model, and inputting the digital modeling label of each community digital model into the test case matching model to obtain a test case, which achieves the highest test accuracy and test matching degree, of each community digital model and is used as the optimal community test case of each community digital model.
Because the power relevance of each power secondary device in each community digital model is strong, the optimal community test case is selected for each community digital model and directly applied to the corresponding community digital model, all the power secondary devices in the community digital model can be covered, and the community digital model is used for testing.
And S3, inputting display data of the power secondary equipment in the community digital model applied with the optimal community test case into a preset detection model to position a power failure point in the community digital model.
Inputting display data of the secondary power equipment in the community digital model with the optimal community test case to a preset detection model to position a power failure point in the community digital model, and the method comprises the following steps:
applying the optimal community test case to the community digital model, and acquiring display data of the power secondary equipment in the community digital model;
and outputting the display data to a preset detection model, judging the operation state of each power secondary device by the preset detection model, and calibrating the physical position of the power secondary device of which the operation state is judged to be the fault state as a power fault point.
The construction of the preset detection model is obtained by training a classifier model through big data.
The topological feature vector comprises maximum degree, average degree, entropy, energy, average joint degree, average shortest path length and average cluster coefficient.
The clustering operation is set as small community clustering so as to ensure the identity of the digital modeling label of the power secondary equipment in the community digital model.
According to the method, local digital modeling is carried out on each electric power secondary device, the device relevance of an electric power system during modeling is guaranteed, the electric power integrity of intelligent detection is further guaranteed, the circuit fault location accuracy is improved, meanwhile, the test cases are evaluated by the aid of the neural network in the local detection, the best test case which guarantees that the community test cases have the highest test coverage in the community digital model is selected, the community digital model is uniformly detected, the electric power devices are uniformly detected by means of the relevance of the electric power system, the detection efficiency is improved, and meanwhile, the fault location accuracy is further improved.
The above embodiments are only exemplary embodiments of the present application, and are not intended to limit the present application, and the protection scope of the present application is defined by the claims. Various modifications and equivalents may be made to the disclosure by those skilled in the art within the spirit and scope of the disclosure, and such modifications and equivalents should also be considered as falling within the scope of the disclosure.
Claims (10)
1. A digital modeling and intelligent detection method for electric secondary equipment is characterized in that: the method comprises the following steps:
the method comprises the following steps of S1, extracting an electrical signal, a physical position and an information attribute of the electric power secondary equipment, constructing a digital modeling label of the electric power secondary equipment based on the electrical signal, the physical position and the information attribute of the electric power secondary equipment, and constructing a plurality of community digital models of the electric power secondary equipment based on the identity of the digital modeling label of the electric power secondary equipment;
s2, sequentially making an optimal community test case of each community digital model in each community digital model through a neural network according to a digital modeling label of power secondary equipment so as to ensure that the community test case has the highest test coverage in the community digital model and realize the uniform detection of the community digital model;
and S3, inputting display data of the power secondary equipment in the community digital model applied with the optimal community test case into a preset detection model to position a power failure point in the community digital model.
2. The digital modeling and intelligent detection method for electric secondary equipment according to claim 1, characterized in that: the digital modeling label of the electric power secondary equipment is constructed based on the electric signal, the physical position and the information attribute of the electric power secondary equipment, and comprises the following steps:
performing principal component analysis on the electrical signals, the physical positions and the information attributes to obtain a plurality of digital characteristics, and performing weighted modeling on each digital characteristic to obtain a characteristic network model;
and performing minimum spanning tree decomposition evolution on the characteristic network model to obtain a dynamic network model, and performing topological feature extraction on the dynamic network model to obtain a topological feature vector as a digital modeling label of the power secondary equipment.
3. The digital modeling and intelligent detection method for the secondary power equipment according to claim 2, characterized in that: the construction of the characteristic network model comprises the following steps:
taking each digital feature as a network topology node of a feature network model, and arranging a topology connecting edge between any two digital features;
and taking the Euclidean distance between any two digital characteristics as the edge weight of the topological connection between the corresponding network topology nodes to obtain the characteristic network model.
4. The digital modeling and intelligent detection method for the secondary power equipment according to claim 3, characterized in that: the evolution expression of the dynamic network model is as follows:
T i =MST(G cn 0 - G cn i-1 )：
G cn i = G cn i-1 + T i ；
in the formula, T i Is as followsiMinimum spanning tree, G, by secondary evolution cn i-1 Is as followsiDynamic network model obtained by secondary evolution, G cn 0 As a feature network model, G cn 0 - G cn i-1 Is G cn 0 And G cn i-1 The graph difference operation of (1), MST is a minimum spanning tree generation algorithm,ifor the count term of the number of evolutions,i∈[2,N]n is the total number of evolutions, G cn N Is a dynamic network model;
wherein, T 1 =MST(G cn 0 )，G cn 1 = T 1 ；
In the formula, T 1 Minimum spanning Tree, G, for evolution 1 cn 1 The dynamic network model obtained for the 1 st evolution.
5. The digital modeling and intelligent detection method for the secondary power equipment according to claim 4, characterized in that: the establishment of a plurality of community digital models of the electric power secondary equipment based on the identity of the digital modeling labels of the electric power secondary equipment comprises the following steps:
clustering operation is carried out on each electric power secondary device based on the digital modeling label so as to classify each electric power secondary device into a plurality of device communities, and digital modeling is carried out on each device community by utilizing the digital modeling label corresponding to the community-based center point so as to obtain a plurality of community digital models.
6. The digital modeling and intelligent detection method for electric secondary equipment according to claim 5, characterized in that: the method for making the optimal community test case of each community digital model in each community digital model sequentially through the neural network according to the digital modeling label of the power secondary equipment comprises the following steps:
selecting a plurality of groups of test cases and a plurality of electric power secondary devices, and applying each group of test cases to each electric power secondary device in sequence to monitor the test accuracy and the test matching degree;
selecting a test case with the highest test accuracy and test matching degree for each electric power secondary device, extracting topological characteristic vectors of the electric power secondary devices as input items of the neural network, and using the test case as output items of the neural network;
and performing network training on the input items and the output items by utilizing a neural network to obtain a test case matching model, and inputting the digital modeling label of each community digital model into the test case matching model to obtain a test case, which achieves the highest test accuracy and test matching degree, of each community digital model and is used as the optimal community test case of each community digital model.
7. The digital modeling and intelligent detection method for electric power secondary equipment according to claim 6, characterized in that: the method for positioning the power failure point in the community digital model by inputting the display data of the power secondary equipment in the community digital model applied with the optimal community test case into the preset detection model comprises the following steps:
applying the optimal community test case to the community digital model, and acquiring display data of the power secondary equipment in the community digital model;
and outputting the display data to a preset detection model, judging the operation state of each electric power secondary device by the preset detection model, and calibrating the physical position of the electric power secondary device of which the operation state is judged to be the fault state as an electric power fault point.
8. The digital modeling and intelligent detection method for the electric power secondary equipment according to claim 7, wherein the preset detection model is constructed by training a classifier model through big data.
9. The method according to claim 8, wherein the topological feature vector comprises a maximum degree, an average degree, entropy, energy, an average degree of association, an average shortest path length, and an average class coefficient.
10. The method as claimed in claim 9, wherein the clustering operation is set as small community clustering to ensure identity of the digital modeling label of the secondary power equipment in the community digital model.
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