CN112016473A - Power distribution network high-resistance grounding fault diagnosis method based on semi-supervised learning and attention mechanism - Google Patents
Power distribution network high-resistance grounding fault diagnosis method based on semi-supervised learning and attention mechanism Download PDFInfo
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Abstract
The invention discloses a power distribution network high resistance grounding fault diagnosis method based on semi-supervised learning and attention mechanism, which comprises the following steps: 1. classifying the fault phase voltage time-series data set into a marked sample set and an unmarked sample set; 2. updating the two types of sample sets according to the similarity of the unmarked sample set and the marked sample set; 3. training a 1NN classifier by using a labeled sample set, and performing prediction labeling on an unlabeled sample set by using the 1NN classifier; 4. constructing an LSTM-CNN neural network based on an attention mechanism; 5. fusing the feature vectors of the LSTM and the CNN by using an attention mechanism network; 6. and updating the neural network parameters of the LSTM-CNN through a gradient descent back propagation algorithm. The invention enables the fault detection model to have time and space characteristic expression capability, thereby improving the high-resistance grounding fault detection rate of the power distribution network.
Description
Technical Field
The invention relates to the field of relay protection of a power distribution network, a high-resistance grounding fault diagnosis technology and a deep learning technology, in particular to a high-resistance grounding fault diagnosis method based on semi-supervised learning and attention mechanism.
Background
The power distribution network is close to users, the operation environment is complex, and the power distribution network is easy to contact with branches, buildings or the ground during operation, so that high-resistance faults are generated. For such a fault, the change of the electrical quantity is not obvious due to the large grounding resistance, and the conventional protection is difficult to operate reliably. Most high-resistance faults can not seriously affect a power distribution network, but if the faults exist for a long time, the system can generate a new grounding point due to overvoltage generated by the faults, so that the accidents are further expanded, and even fire disasters can be caused by electric arcs accompanied by the faults when the faults occur, so that personal and property safety is threatened. High resistance fault identification is one of the very challenging difficult problems in the field of power distribution network relay protection.
A power grid intelligent scheduling and control education department key laboratory (Shandong university) Wemingjie et al researches a power distribution network high-resistance ground fault detection method (power system automation, 2020,44(14): 164. charge 175.) based on a zero-sequence current waveform interval slope curve, describes waveform nonlinear distortion by adopting least square linear fitting based on analysis of a 10kV power grid field actual measurement high-resistance fault waveform, simultaneously inhibits interference of irregular waveform distortion on the interval slope curve by adopting a Grubbs method, and further ensures correct extraction of fault characteristics by an algorithm. However, the method is difficult to determine a reasonable setting threshold value aiming at complex operating environment and various fault characteristics, does not have a universal judgment rule, and is poor in sensitivity.
A high-resistance ground fault identification method (an electrical measurement and instrument 2020,57(02):52-56.) for a power distribution network based on PSO and a Bayes classifier is researched by Wenying and Pimping, Chenxiangyu and other people of a SpA-Tujin power supply company of Liaoning Power saving Limited of China, and the method firstly adopts discrete wavelet transformation to construct a time-frequency matrix of voltage and current of the power distribution network and extracts characteristic quantities reflecting the high-resistance ground fault. The method optimizes the characteristic space of the electric quantity data, and improves the classification accuracy and the calculation timeliness. But the selection of the mother wavelet function directly affects the quality of the wavelet transform extracted feature information. Generally, for specific distribution network topology and parameters, fixed mother wavelets need to be selected through repeated trial and error, and the method can only achieve the local optimal effect.
Suwen clever, Zhu Xingyu and the like at the university of Fuzhou invented a high-resistance ground fault detection method for a power distribution network based on wavelet transformation and a neural network (publication number: CN 109613402A). The method utilizes an evolved neural network to improve the traditional detection method. The evolved neural network is an intelligent system based on a dynamic connection structure, and the topological structure of the system can be adjusted through incremental learning so as to incorporate new information. The method utilizes discrete wavelet transformation to process fault signals, and the fault signals are input into an evolved neural network, so that the high-resistance grounding fault of the power distribution network is detected. But the unmarked samples in the high-resistance fault detection of the power distribution network are large in quantity and easy to obtain, the marked samples are small in quantity and difficult to obtain, and the unmarked data are much more than the marked data. The method does not adopt unmarked data for training, can not really represent the distribution characteristics of the real data, the classifier can not correctly find the classification boundary of the real data, the method can not fully utilize a sample set, and the fault diagnosis does not achieve the best effect.
Disclosure of Invention
The invention aims to avoid the defects of the prior art, and provides a high-resistance grounding fault diagnosis method for a power distribution network based on semi-supervised learning and attention mechanism, so that when massive high-resistance fault data are faced, fault sample information is fully acquired through the semi-supervised learning mechanism, and characteristics of a sample set on time domain and frequency domain are fused by using an attention mechanism network, thereby improving the high-resistance grounding fault detection rate of the power distribution network and meeting the actual requirement of rapidness and accuracy.
The invention adopts the following technical scheme for solving the technical problems:
the invention relates to a method for diagnosing a high-resistance grounding fault of a power distribution network based on semi-supervised learning and attention mechanism, which is characterized by comprising the following steps of:
step 1: when a group of high-resistance ground faults of the power distribution network are obtained, a fault phase voltage time sequence of a secondary side end of a transformer is obtained and is used as a training sample, and the training sample is recorded as TS ═ TS1,TS2,···,TSi,···,TSN}; wherein N represents the number of training samples, TSiRepresenting the ith fault phase voltage time sequence in the training sample, and comprising:
TSi={(t1,xi,1),(t2,xi,2),···,(tj,xi,j),···,(tq,xi,q) Q represents the length of the ith fault phase voltage time sequence in the training sample, tjRepresents the jth time, x, in the training samplei,jRepresenting the voltage value corresponding to the ith fault phase voltage time sequence in the training sample at the jth time;
Step 3, defining a variable k, and initializing k to be 1; define the set of unlabeled samples after the kth update asAnd is initialized to DuThe set of marked samples after the kth update isInitialisation to Dp;
step 5, defining the unmarked sample set after the kth updateSingle sample and labeled sample setThe similarity threshold value of (a);
judging the similarity vector RkIf all the similarity degrees are less than the preset similarity degree, executing a step 7, otherwise, executing a step 6;
step 7, utilizing the marked sample set after the kth updatingTraining a nearest neighbor 1NN classifier to obtain a trained 1NN classifier which is used for collecting unlabeled samplesClassifying;
then, the unlabeled samples with the real labels are collectedAnd labeled sample setsMerging to obtain a high-resistance fault training set T containing N samples;
step 9, constructing an LSTM-CNN neural network based on an attention mechanism;
the LSTM-CNN neural network comprises an LSTM network, a CNN network, a feature fusion layer based on an attention mechanism and an SCN classifier; the number of input nodes of the LSTM network is qx 1, and the output dimension of the hidden layer is mx 1; the output dimension of the CNN network hidden layer is mx 1;
step 11, defining a variable i, and initializing to i-1;
Step 13,Sampling the image sample XiInputting the CNN network in the LSTM-CNN neural network of the mu iteration to obtain a feature vector C with dimension of m multiplied by 1i,μ;
Step 14, selecting the ith fault phase voltage time sequence sample from the high-resistance fault training set T, inputting the ith fault phase voltage time sequence sample into an LSTM network in an LSTM-CNN neural network of the mu iteration to obtain a feature vector with dimension q x mWherein,inputting the n-th time step representing the ith fault phase voltage time sequence sample into an LSTM network in an LSTM-CNN neural network of the mu-th iteration, and outputting a feature vector with the dimension of m multiplied by 1;
step 15, utilizing the formula (1-1) -formula (1-3) to align the feature vector Ci,μAnd the feature vector Hi,μPerforming fusion to obtain m × 1 feature vector F with dimensioni,μ;
In the formula (1-1) -formula (1-3),the weight matrix of the feature fusion layer of the LSTM-CNN neural network of the mu iteration is a dimension of m multiplied by m;is a special feature of the LSTM-CNN neural network of the μ th iterationCharacterizing a bias term of the merged layer;representing a feature vector with dimension of m multiplied by 1 output by an LSTM network in an LSTM-CNN neural network of the mu iteration when an ith fault phase voltage time sequence sample is input at the ith time step; alpha is alphai,μ,nIn the feature fusion layer of the LSTM-CNN neural network representing the μ th iterationCorresponding fusion weight coefficients;
step 16, the feature vector Fi,μInputting the SCN classifier in the LSTM-CNN neural network of the mu iteration to obtain an output result t'i,μWill output the result t'i,μAnd the desired output tiTaking difference to obtain the output error e of the SCN classifieri,μ;
Step 17, assigning i +1 to i, and then judging whether i is greater than N; if yes, continuing to execute the step 18, otherwise, returning to the step 12;
step 18, calculating the output root mean square error of the SCN classifier in the LSTM-CNN neural network of the mu iteration to be
Step 19, judging mu is more than mumaxAnd eμ<e0Whether the two are true at the same time; if yes, obtaining the LSTM-CNN neural network A of the mu iterationμAnd the method is used for diagnosing the high-resistance grounding fault of the power distribution network, otherwise, after the mu +1 is assigned to the mu, the LSTM-CNN neural network A of the mu iteration is updated according to a gradient descent algorithmμThen, step 11 is performed, wherein e0An error threshold is manually set.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the method, a semi-supervised learning mechanism is adopted to carry out full labeling on massive fault phase voltage time sequence data, the problem that a deep learning network needs a large number of known samples to carry out training is solved, inconvenience caused by factors such as difficulty in obtaining high-resistance fault labeling data is reduced, and the detection rate of the method for the high-resistance ground fault of the power distribution network is improved.
2. The invention utilizes the LSTM network and the CNN network to respectively extract the characteristics of the fault phase voltage time sequence data on the time dimension and the frequency domain, fuses the time-frequency characteristics of the data in an attention mechanism mode and dynamically weights the changed time characteristics, thereby enhancing the time-frequency characteristic expression capability of the method and ensuring the reliability of the high-resistance grounding fault diagnosis of the power distribution network.
3. The random configuration network is adopted to replace a softmax layer in the traditional convolutional neural network, the learning capability and the generalization capability of a learner are enhanced, the global approximation of a high-resistance fault state of multi-scale characteristics of fault phase voltage time sequence data is realized, and the identification precision of the high-resistance ground fault of the power distribution network is improved.
Drawings
FIG. 1 is a flow chart of a high-resistance grounding fault diagnosis method based on a power distribution network according to the invention;
FIG. 2 is a timing waveform of a sample time series of a faulted phase voltage of the present invention;
FIG. 3 is a Fourier transform plot of samples of a time series of faulted phase voltages of the present invention;
fig. 4 is a schematic diagram of a high-resistance ground fault diagnosis model of the power distribution network.
Detailed Description
In this embodiment, referring to fig. 1, a method for diagnosing a high impedance ground fault of a power distribution network based on semi-supervised learning and attention mechanism is performed according to the following steps:
step 1: when a group of high-resistance ground faults of the power distribution network are obtained, a fault phase voltage time sequence of a secondary side end of a transformer is obtained and is used as a training sample, and the training sample is recorded as TS ═ TS1,TS2,···,TSi,···,TSN}; where N represents the number of training samples, TSiRepresenting the ith fault phase voltage time sequence in the training sample, and comprising: TS (transport stream)i={(t1,xi,1),(t2,xi,2),···,(tj,xi,j),···,(tq,xi,q) Q represents the length of the ith fault phase voltage time sequence in the training sample, tjRepresenting the jth time, x, in the training samplei,jRepresenting the voltage value corresponding to the ith fault phase voltage time sequence in the training sample at the jth time;
Step 3, defining a variable k, and initializing k to be 1; define the set of unlabeled samples after the kth update asAnd is initialized to DuThe set of marked samples after the kth update isInitialisation to Dp;
step 5, defining the unmarked sample after the kth updateThis collectionSingle sample and labeled sample setThe similarity threshold value of (a);
judging the similarity vector RkIf all the similarity degrees are less than the preset similarity degree, executing a step 7, otherwise, executing a step 6; in specific implementations, wherein the similarity threshold is set to 0.8;
step 7, utilizing the marked sample set after the kth updatingTraining a nearest neighbor 1NN classifier to obtain the trained 1NN classifier for unlabeled sample setClassifying;
then, the unlabeled samples with the real labels are collectedAnd labeled sample setsMerging to obtain a high-resistance fault training set T containing N samples;
in the embodiment, an intercepted part of a fault phase voltage time sequence data sample in a high-resistance fault training set T is shown in a table I; a timing waveform diagram of the faulted phase voltage time series samples is shown in figure 2.
Sample cutting part of watch phase voltage time sequence data
T(s) | 1/60 | 2/60 | 3/60 | 4/60 | 5/60 | 6/60 | 7/60 | 8/60 | 9/60 | 10/60 |
V(v) | -26.2228 | -9.5195 | 5.5134 | 17.2057 | 25.5574 | 39.4768 | 56.7368 | 71.7698 | 85.6892 | 94.0408 |
T(s) | 11/60 | 12/60 | 13/60 | 14/60 | 15/60 | 16/60 | 17/60 | 18/60 | 19/60 | 20/60 |
V(v) | 102.9492 | 107.9602 | 109.6305 | 114.6415 | 120.766 | 128.5609 | 135.799 | 143.5939 | 150.8319 | 161.9675 |
T(s) | 21/60 | 22/60 | 23/60 | 24/60 | 25/60 | 26/60 | 27/60 | 28/60 | 29/60 | 30/60 |
V(v) | 168.6488 | 172.5462 | 173.6598 | 170.8759 | 165.8649 | 155.8429 | 148.0481 | 140.81 | 134.1287 | 125.2203 |
Step 9, constructing an LSTM-CNN neural network based on an attention mechanism;
the LSTM-CNN neural network comprises an LSTM network, a CNN network, a feature fusion layer based on an attention mechanism and an SCN classifier; the number of input nodes of the LSTM network is qx 1, and the output dimension of the hidden layer is mx 1; the output dimension of the CNN network hidden layer is mx 1;
step 11, defining a variable i, and initializing to i-1;
Step 13, image sample XiInputting the CNN network in the LSTM-CNN neural network of the mu iteration to obtain a feature vector C with dimension of m multiplied by 1i,μ;
Step 14, selecting the ith fault phase voltage time sequence sample from the high-resistance fault training set T, inputting the ith fault phase voltage time sequence sample into an LSTM network in an LSTM-CNN neural network of the mu iteration to obtain a feature vector with dimension q multiplied by m
Wherein,inputting the n-th time step representing the ith fault phase voltage time sequence sample into an LSTM network in an LSTM-CNN neural network of the mu-th iteration, and outputting a feature vector with the dimension of m multiplied by 1;
step 15, feature vector C is aligned by using formula (1-1) -formula (1-3)i,μAnd the feature vector Hi,μPerforming fusion to obtain m × 1 feature vector F with dimensioni,μ;
In the formula (1-1) -formula (1-3),the weight matrix of the feature fusion layer of the LSTM-CNN neural network of the mu iteration is a dimension of m multiplied by m;is a bias term for the feature fusion layer of the LSTM-CNN neural network for the μ iteration;representing a feature vector with dimension of m multiplied by 1 output by an LSTM network in an LSTM-CNN neural network of the mu iteration when an ith fault phase voltage time sequence sample is input at the ith time step; alpha is alphai,μ,nIn the feature fusion layer of the LSTM-CNN neural network representing the μ th iterationCorresponding fusion weight coefficients;
step 16, feature vector Fi,μInputting the SCN classifier in the LSTM-CNN neural network of the mu iteration to obtain an output result t'i,μWill output the result t'i,μAnd the desired output tiTaking difference to obtain the output error e of the SCN classifieri,μ(ii) a In the specific embodiment, the power distribution network high-resistance grounding fault diagnosis method constructed by the method of the step 9 to the step 16The broken model schematic diagram is shown in FIG. 4;
step 17, assigning i +1 to i, and then judging whether i is greater than N; if yes, continuing to execute the step 18, otherwise, returning to the step 12;
step 18, calculating the output root mean square error of the SCN classifier in the LSTM-CNN neural network of the mu iteration to be
Step 19, judging mu is more than mumaxAnd eμ<e0Whether the two are true at the same time; if yes, obtaining the LSTM-CNN neural network A of the mu iterationμAnd the method is used for diagnosing the high-resistance grounding fault of the power distribution network, otherwise, after the mu +1 is assigned to the mu, the LSTM-CNN neural network A of the mu iteration is updated according to a gradient descent algorithmμThen, step 11 is performed, wherein e0An error threshold is manually set. In a specific embodiment, the maximum number of iterations μ of the network is set manuallymax=500,e0=0.01。
Claims (1)
1. A high-resistance grounding fault diagnosis method for a power distribution network based on semi-supervised learning and attention mechanism is characterized by comprising the following steps:
step 1: when a group of high-resistance ground faults of the power distribution network are obtained, a fault phase voltage time sequence of a secondary side end of a transformer is obtained and is used as a training sample, and the training sample is recorded as TS ═ TS1,TS2,…,TSi,…,TSN}; wherein N represents the number of training samples, TSiRepresenting the ith fault phase voltage time sequence in the training sample, and comprising: TS (transport stream)i={(t1,xi,1),(t2,xi,2),…,(tj,xi,j),…,(tq,xi,q) Q represents the length of the ith fault phase voltage time sequence in the training sample, tjRepresents the jth time, x, in the training samplei,jRepresenting the voltage value corresponding to the ith fault phase voltage time sequence in the training sample at the jth time;
step (ii) of2. Denoising the fault phase voltage time sequence set TS to obtain a preprocessed fault phase voltage time sequence set; classifying the preprocessed fault phase voltage time sequence set into a fault phase voltage time sequence sample set D containing unmarked fault phase voltage time sequence samplesuAnd a time series sample set D containing the marked fault phase voltagep;
Step 3, defining a variable k, and initializing k to be 1; define the set of unlabeled samples after the kth update asAnd is initialized to DuThe set of marked samples after the kth update isInitialisation to Dp;
Step 4, calculating the unmarked sample set after the kth updatingThe jth fault phase voltage time sequence sample and the kth updated marked sample setSimilarity of (2) RjThereby obtaining a similarity vectorj=1,2,...mk,mkAs the set of unlabeled samples after the kth updateThe number of samples of (a);
step 5, defining the unmarked sample set after the kth updateSingle sample and labeled sample setThe similarity threshold value of (a);
judging the similarity vector RkIf all the similarity degrees are less than the preset similarity degree, executing a step 7, otherwise, executing a step 6;
step 6, selecting the unmarked sample set after the kth updatingNeutralization of labeled sample setsAnd manually marking the sample with the maximum similarity, and adding the manually marked sample into the marked sample setAnd obtaining the unmarked sample set after the k +1 time of updatingSimultaneous unlabeled sample setDeleting the artificially marked samples to obtain an unmarked sample set updated for the (k + 1) th timeAssigning k +1 to k, and returning to the step 4;
step 7, utilizing the marked sample set after the kth updatingTraining a nearest neighbor 1NN classifier to obtain a trained 1NN classifier which is used for collecting unlabeled samplesClassifying;
step 8, collecting the unmarked samples after the kth updatingInputting the trained 1NN classifier, and taking the obtained prediction label as a real label of an unlabeled sample;
then, the unlabeled samples with the real labels are collectedAnd labeled sample setsMerging to obtain a high-resistance fault training set T containing N samples;
step 9, constructing an LSTM-CNN neural network based on an attention mechanism;
the LSTM-CNN neural network comprises an LSTM network, a CNN network, a feature fusion layer based on an attention mechanism and an SCN classifier; the number of input nodes of the LSTM network is qx 1, and the output dimension of the hidden layer is mx 1; the output dimension of the CNN network hidden layer is mx 1;
step 10, defining the current iteration number of the network as mu, and initializing mu to 1; maximum number of iterations is mumax(ii) a Carrying out the random initialization for the mu time on the parameters of each layer in the network so as to obtain an LSTM-CNN neural network of the mu time iteration;
step 11, defining a variable i, and initializing to i-1;
step 12, carrying out Fourier transform on the ith fault phase voltage time sequence sample in the high-resistance fault training set T to obtain an image sample X of the ith fault phase voltage time sequencei;
Step 13, the image sample XiInputting the CNN network in the LSTM-CNN neural network of the mu iteration to obtain a feature vector C with dimension of m multiplied by 1i,μ;
Step 14, from the high resistance fault training set TThe ith fault phase voltage time sequence sample is selected and input into the LSTM network in the LSTM-CNN neural network of the mu iteration to obtain a feature vector with dimension of q x mWherein,inputting the n-th time step representing the ith fault phase voltage time sequence sample into an LSTM network in an LSTM-CNN neural network of the mu-th iteration, and outputting a feature vector with the dimension of m multiplied by 1;
step 15, utilizing the formula (1-1) -formula (1-3) to align the feature vector Ci,μAnd the feature vector Hi,μPerforming fusion to obtain m × 1 feature vector F with dimensioni,μ;
In the formula (1-1) -formula (1-3),the weight matrix of the feature fusion layer of the LSTM-CNN neural network of the mu iteration is a dimension of m multiplied by m;is a bias term for the feature fusion layer of the LSTM-CNN neural network for the μ iteration;representing a feature vector with dimension of m multiplied by 1 output by an LSTM network in an LSTM-CNN neural network of the mu iteration when an ith fault phase voltage time sequence sample is input at the ith time step; alpha is alphai,μ,nIn the feature fusion layer of the LSTM-CNN neural network representing the μ th iterationCorresponding fusion weight coefficients;
step 16, the feature vector Fi,μInputting the SCN classifier in the LSTM-CNN neural network of the mu iteration to obtain an output result t'i,μWill output the result t'i,μAnd the desired output tiTaking difference to obtain the output error e of the SCN classifieri,μ;
Step 17, assigning i +1 to i, and then judging whether i is greater than N; if yes, continuing to execute the step 18, otherwise, returning to the step 12;
step 18, calculating the output root mean square error of the SCN classifier in the LSTM-CNN neural network of the mu iteration to be
Step 19, judging mu is more than mumaxAnd eμ<e0Whether the two are true at the same time; if yes, obtaining the LSTM-CNN neural network A of the mu iterationμAnd the method is used for diagnosing the high-resistance grounding fault of the power distribution network, otherwise, after the mu +1 is assigned to the mu, the LSTM-CNN neural network A of the mu iteration is updated according to a gradient descent algorithmμThen, step 11 is performed, wherein e0An error threshold is manually set.
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