CN112782523B - Power distribution network single-phase earth fault line selection method based on dynamic mode matching distance - Google Patents
Power distribution network single-phase earth fault line selection method based on dynamic mode matching distance Download PDFInfo
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Abstract
The invention belongs to the field of power distribution network fault identification and safe operation, particularly relates to a power distribution network single-phase earth fault line selection method, and particularly relates to a power distribution network single-phase earth fault line selection method based on a dynamic pattern matching distance. Firstly, dynamically segmenting transient zero-sequence current of a single-phase grounded line by taking equal segmentation points and extreme points as endpoints, realizing symbolic expression of form modes of subsegment sequences according to the average values and the variation trend of each segment, defining mode matching distances by using the heterogeneity among the modes, secondly, obtaining a dynamic mode matching distance matrix among zero-sequence current waveforms of the line by using a Dynamic Time Warping (DTW) planning principle, and finally, realizing single-phase grounded line selection by using a fuzzy C mean clustering algorithm. The result shows that the method can effectively improve the accuracy and fault tolerance of fault line selection of the power distribution network, and has certain practical significance for safe operation of the power distribution network.
Description
Technical Field
The invention belongs to the field of power distribution network fault identification and safe operation, particularly relates to a power distribution network single-phase earth fault line selection method, and particularly relates to a power distribution network single-phase earth fault line selection method based on a dynamic pattern matching distance.
Background
The resonant grounding is an important grounding operation mode in a medium-low voltage power grid in China, the resonant grounding can compensate capacitance current in the single-phase grounding short-circuit process, the circuit is allowed to operate for 1-2h after a fault, but the line insulation damage is easily caused by the long-term operation of the non-fault phase voltage rise, the interphase short circuit is caused, the fault is enlarged, and therefore the quick judgment and removal of the fault line have important significance for the safe operation of the power distribution network.
The existing line selection method for single-phase earth faults is divided into a steady-state method and a transient-state method. The steady-state signal is easily influenced by factors such as the size of a transition resistor, an operation mode, the length of an outgoing line, the unbalanced current of a mutual inductor and the like, and the transient-state signal is not influenced by an arc suppression coil and has high sensitivity, so that the line selection by utilizing the transient-state signal is a research hotspot in the field in recent years. Many line selection characteristic quantities are obtained by extracting the characteristic frequency bands of the transient quantities, but the line selection may fail due to different time windows selected for different types of faults; by using wavelet transformation and taking energy and polarity as criteria, if engineering problems such as reverse polarity connection or asynchronous sampling of a zero sequence current transformer occur, line selection failure can be caused; the fault line selection is carried out by using the morphological peak-valley characteristics of the transient zero sequence current, when a small-angle fault occurs, the transient information is not obvious, and the reliability of the method is not high.
Disclosure of Invention
1. The technical problem to be solved is as follows:
the existing line selection method for the single-phase earth fault has the possibility of causing line selection failure due to different time windows for selecting different types of faults.
2. The technical scheme is as follows:
the invention provides a power distribution network single-phase earth fault line selection method for identifying line zero-sequence current waveform characteristics by using a dynamic mode matching distance; the method comprises the steps of dynamically segmenting transient zero-sequence current of a line after single-phase grounding by taking equal segmentation points and extreme points as endpoints, realizing symbolic expression of a sub-segmentation sequence form mode according to each segmentation mean value and the variation trend thereof, defining mode matching distance by using the heterogeneity among the modes, obtaining a dynamic mode matching distance matrix among zero-sequence current waveforms of the line by using a Dynamic Time Warping (DTW) planning principle, and finally realizing single-phase grounding line selection by using a fuzzy C mean value clustering algorithm. The method can improve the effect of transient zero-sequence current waveform shape depiction, reduce the time complexity of the traditional distance measurement method and improve the accuracy of fault line selection.
The invention provides a dynamic pattern matching distance-based power distribution network single-phase earth fault line selection method, which specifically comprises the following steps:
step 1: according to the network structure of the power distribution network, a single-phase earth fault of a line is set, zero-sequence current data under different sampling frequencies are obtained in a simulation mode, and the number k of each sub-sequence data and the number b of equal intervals of peak and valley values after a sampling sequence is segmented according to the equal segments are determined;
and 2, step: when the zero sequence voltage of the bus is greater than a set threshold value, starting a line selection protection device, and acquiring transient zero sequence current data of a line with a fault in real time, wherein the line comprises a fault line and a non-fault line;
and 3, step 3: processing transient zero sequence current data of each line;
and 4, step 4: according to the solving process according to the dynamic time bending distance, seeking an optimal path of a form mode matrix M through a dynamic programming method, and solving a form mode sequence accumulated distance matrix R, wherein the optimal path is a path which is found out of the form mode matrix M and is dynamically bent, so that the sum of all elements on the path is minimum;
and 5: defining a final accumulated distance d = r (m, n) as the dynamic pattern matching distances of the time series X and Y;
step 6: traversing n lines to form a dynamic mode matching distance between every two lines to obtain a dynamic mode matching matrix D:
in the formula d ij Represents the dynamic pattern matching distance of the ith and jth lines, i ∈ [1, n ]],j∈[1,n]；
Carrying out fuzzy C-means clustering analysis on the matrix D, and realizing single-phase earth fault line selection by using a membership matrix, wherein a target function of the fuzzy C-means clustering and the membership matrix are as follows:
wherein M is fuzzy weighted index, and M =2,n is takenIs the total number of lines, d j Dynamic pattern matching distance for jth line and all lines, d j ＝[d j1 ,d j2 ,…,d jn ]；h i Representing the cluster center vector, h i ＝[h 1 ,h 2 ](ii) a J denotes an objective function, U denotes a membership matrix, H denotes a cluster center, U denotes a cluster center ij Representing the membership degree of the jth sample belonging to the ith class;
after the objective function J converges, a membership degree matrix U and a clustering center H, U are obtained ij The following conditions need to be satisfied:
further obtaining a membership matrix U:
3. has the advantages that:
after the equal segmentation points and the extreme points are inserted, the method not only reduces the dimensionality of the time sequence, but also can filter noise and simultaneously reserve the integral trend information of the time sequence to a great extent. The time sequence morphology is modeled, and the average value information of each segment is combined in the traditional ternary fluctuation mode, so that the local morphological characteristics of the time sequence can be detailed, and the overall trend of the time sequence can be grasped. And finally, measuring the heterogeneity of the sequence morphology mode by using the mode matching distance, thereby effectively avoiding the influence of local mutation and abnormal conditions on the overall similarity of the sequence.
Drawings
FIG. 1 is a diagram of the fluctuation pattern of the time series of the present invention.
FIG. 2 is a dynamic time warping distance path diagram according to the present invention.
FIG. 3 is a flow chart of fuzzy C-means clustering according to the present invention.
Fig. 4 is a simplified simulation model diagram of a distribution network according to the present invention.
Fig. 5 is a waveform diagram of a transient zero-sequence current according to an embodiment of the present invention.
FIG. 6 is a flow chart for determining the k and b values according to the present invention.
FIG. 7 is a k-f and b-f relationship diagram according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The method for selecting the single-phase earth fault line of the power distribution network based on the dynamic mode matching distance comprises the following steps:
step 1: and (4) according to the network structure of the power distribution network, setting a single-phase earth fault of the line, simulating to obtain zero-sequence current data under different sampling frequencies, and determining the number k of each sub-sequence data and the number b of peak-valley equally-divided intervals after the sampling sequence is equally segmented according to the method in the step 7.
Step 2: and when the bus zero sequence voltage is greater than a set threshold value, starting a line selection protection device, and acquiring transient zero sequence current data of a line with a fault in real time, wherein the line comprises a fault line and a non-fault line.
And 3, step 3: the method for processing the transient zero sequence current data of each line specifically comprises the following steps:
the method comprises the following steps: firstly, carrying out normalization processing on data, and uniformly mapping the data between [0,1 ]; the normalization processing method is shown as the formula (1):
in the formula (1), x represents data before normalization, and x * Represents the normalized data;
step two: dynamically segmenting the normalized data by taking equal segmentation points and extreme points as end points;
step three: equally dividing the peak-to-valley value of the normalized time series into b intervals by taking the peak-to-valley value of the normalized time series as a boundary, wherein the b intervals are shown in table 1;
as can be seen from fig. 1, the fluctuation mode is simply used as the time series variation trend, and although the local state can be effectively represented, the overall state is difficult to accurately reflect, so that the fluctuation mode can be more refined by combining the mean information of each segment, and the overall trend variation of the time series can be better depicted.
Step four: calculating the variation trend and the average value of each sub-segment; the variation trend comprises rising (the slope is greater than 0), keeping unchanged (the slope is 0) and falling (the slope is less than 0).
Step five: changing the sampling sequence into a corresponding form mode sequence according to the change trend and the mean value interval of each sub-segment by referring to the table 1;
TABLE 1 morphological mode notation
X in Table 1 min And x max Respectively represent a bottom value and a peak value of the normalized time series, c = (x) max -x min )/b，
Is the average value of all sampling points of the ith sub-sequence.
Step six: defining a pattern matching distance dp (X) in the dissimilarity of morphological patterns for two morphological pattern sequences X and Y i ,y j ) The value is as formula (2):
in the formula x i And y j Form pattern elements representing sequences X and Y, respectively;
traversing all the form mode elements of the time sequence X and the time sequence Y to obtain a form mode matrix M as follows:
wherein m and n represent the number of form pattern elements included in the two form pattern sequences X and Y, respectively.
And 4, step 4: according to the solving process of the dynamic time bending distance, an optimal path of a form mode matrix M is sought through a dynamic programming method, and a form mode sequence accumulated distance matrix R is obtained, wherein a path schematic diagram is shown in figure 2, the optimal path refers to finding a dynamic bending path in the form mode matrix M, and all elements on the path are minimum;
where r (i, j) is the cumulative distance, r (0, 0) =0, r (j, 0) = r (0, i) = ∞, and the effective path satisfies three constraints:
(1) The method comprises the following steps: s is more than or equal to max (m, n) and less than or equal to m + n-1, and S is the total step number of walking;
(2) And (3) boundary limitation: the starting point is (1, 1), and the end point is (m, n);
(3) Continuity: the occurrence of local jumps is not allowed.
And 5: the final accumulated distance d = r (m, n) is defined as the dynamic pattern matching distance of the time series X and Y.
Step 6: traversing n lines to form a dynamic mode matching distance between every two lines to obtain a dynamic mode matching matrix D:
in the formula d ij Represents the dynamic pattern matching distance of the ith and jth lines, i ∈ [1, n ]],j∈[1,n]。
And carrying out fuzzy C-means clustering analysis on the matrix D, and realizing single-phase earth fault line selection by using a membership matrix, wherein a target function and the membership matrix of the fuzzy C-means clustering are as follows:
wherein M is a fuzzy weighting index, M =2,n is the total number of lines, d j For the dynamic pattern matching distance of the jth line to all lines, d j ＝[d j1 ,d j2 ,…,d jn ]；h i Represents a cluster center vector, h i ＝[h 1 ,h 2 ](ii) a J denotes an objective function, U denotes a membership matrix, H denotes a cluster center, U denotes a cluster center ij Indicating the degree of membership that the jth sample belongs to the ith class.
After the objective function J converges, a membership matrix U and a clustering center H, U are obtained ij The following conditions need to be satisfied:
further obtaining a membership matrix U:
the flow of fuzzy C-means clustering is shown in figure 3;
step 7) a method for determining a k value and a b value, wherein the specific flow is shown in fig. 6, and the method is characterized by comprising the following steps:
the dynamic pattern matching distance between the lines is related to k and b, and is regarded as a function of k and b;
defining the average dynamic mode matching distance D of the fault line and the non-fault line g Average dynamic pattern matching distance D between (k, b) and non-faulty line f (k, b), the expression of which is as follows:
d ij has the same meaning as formula (6), A is failureA line set, B is a non-fault line set, n is the number of feeders, p is the number of fault lines,
defining fault discrimination Q (k, b), wherein the expression is as follows:
the first step is as follows: setting a line fault for the determined network structure, and simulating to obtain zero sequence current data under different sampling frequencies f;
the second step: selecting data of a certain specific sampling frequency as a sample;
the third step: setting an iteration initial value k =2, b =2, the step length is 1, the threshold value k is less than or equal to 20, and b is less than or equal to 10;
the fourth step: calculating positive integers k and b when the fault discrimination Q (k, b) is maximum by adopting a genetic algorithm;
the fifth step: changing the sampling frequency and jumping to the second step;
sixthly, changing a fault line and jumping to the first step;
the seventh step: and (4) drawing a k-f, b-f relation curve, and finding k and b for a certain sampling frequency comparison curve.
This invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, which are provided for a complete and complete disclosure of the invention and to convey the scope of the invention to those skilled in the art.
The validity of the method is checked in the following with a specific fault case. The specific process is as follows:
firstly, a distribution network simulation model diagram shown in the attached figure 4 is built, wherein specific parameters of a cable line and an overhead line are shown in a table 2:
TABLE 2 line parameters
Overhead line parameters
Parameters of cable line
The compensation degree of the arc suppression coil is set to be 10%, A-phase metallic grounding fault occurs at a position 8km away from a bus on a line L2, the initial fault angle is 30 degrees, the fault time is 0.30167s, the fault duration is 0.5s, and the simulation duration is 1s. Transient zero sequence current of each line is sampled by a current transformer, the sampling frequency is 20kHz, according to a relation curve of k-f and b-f in the attached figure 7, k is 6, and b is 4.
And then acquiring data of two periods of the transient zero-sequence current after the fault starts, wherein the waveform of the transient zero-sequence current is shown in figure 5, carrying out normalization processing on the data, dividing every 6 data into a segment, and inserting an extreme point to obtain a new sub-segment. The table look-up 1 equally divides the peak-to-valley value of the normalized time series into 4 intervals, and represents the time series by 12 morphological pattern symbols.
And calculating the variation trend and the mean value of each sub-segment, and changing the segment sequence into a morphological mode sequence according to the morphological mode symbol.
Calculating the mode matching distance of the two lines, calculating the dynamic mode matching distance between the two lines according to the solving process of the dynamic time bending distance of the form mode matrix M, traversing each line to obtain a dynamic mode matching distance matrix D:
carrying out fuzzy C-means clustering on the obtained dynamic mode matching distance matrix D, taking M as 2, setting the iteration frequency to be 50 times at most, and setting the iteration convergence criterion to be 10 -6 After 5 iterations, objective function J (U, H) =139.0864, membership matrix U:
the rows of the membership degree matrix represent categories, the columns 1 to 6 represent lines L1 to L6, the row where the maximum element of each column is located is the category to which the line belongs, and the membership degree matrix can obviously judge that a fault line L2 and a non-fault line belong to different categories, so that the fault of the line L2 is judged.
In order to reflect the adaptability of the algorithm, taking the network structure in the case as an example, several different situations are simulated, and the line selection result is shown as follows:
TABLE 3 line selection results
And (4) conclusion: according to the case line selection result, reliable line selection can be effectively carried out on the single-phase earth fault of the power distribution network by adopting the dynamic mode matching distance method, and the method has good adaptability and fault tolerance on high-resistance earth, noise interference, two-point earth, arc fault and the like.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (3)
1. A power distribution network single-phase earth fault line selection method based on dynamic pattern matching distance comprises the following steps:
step 1: according to the network structure of the power distribution network, a single-phase earth fault of a line is set, zero-sequence current data under different sampling frequencies are obtained in a simulation mode, and the number k of each sub-sequence data and the number b of equal intervals of peak and valley values after a sampling sequence is segmented according to the equal segments are determined;
and 2, step: when the zero sequence voltage of the bus is greater than a set threshold value, starting a line selection protection device, and acquiring transient zero sequence current data of a line with a fault in real time, wherein the line comprises a fault line and a non-fault line;
and step 3: processing transient zero-sequence current data of each line; the method specifically comprises the following steps:
the method comprises the following steps: firstly, carrying out normalization processing on data, and uniformly mapping the data between [0,1 ]; the normalization processing method is shown as formula (1):
in the formula (1), x represents data before normalization, and x * Representing the normalized data;
step two: dynamically segmenting the normalized data by taking equal segmentation points and extreme points as end points;
step three: the peak-valley value of the normalized time series is taken as a boundary and equally divided into b intervals,
step four: calculating the variation trend and the average value of each sub-segment; the trend of change comprises rising, and when the slope is greater than 0; remaining unchanged when the slope is 0; decreasing when the slope is less than 0;
step five: changing the sampling sequence into a corresponding form mode sequence according to the variation trend and the mean value interval of each sub-segment;
step six: defining a pattern matching distance d in terms of the dissimilarity of the morphological patterns for two morphological pattern sequences X and Y p (x i ,y j ) The value is as follows (2):
in the formula x i And y j Form pattern elements representing sequences X and Y, respectively;
step seven: traversing all the form mode elements of the time sequence X and the time sequence Y to obtain a form mode matrix M as follows:
wherein m and n respectively represent the number of form mode elements contained in the two form mode sequences X and Y;
and 4, step 4: according to the solving process of the dynamic time bending distance, seeking an optimal path of a form mode matrix M through a dynamic programming method, and solving a form mode sequence accumulated distance matrix R, wherein the optimal path is to find a dynamic bending path in the form mode matrix M so that the sum of all elements on the path is minimum;
and 5: defining a final accumulated distance d = r (m, n) as the dynamic pattern matching distances of the time series X and Y;
step 6: traversing n lines to form a dynamic mode matching distance between every two lines to obtain a dynamic mode matching matrix D:
in the formula d ij Represents the dynamic pattern matching distance of the ith and jth lines, i ∈ [1, n ]],j∈[1,n]；
Carrying out fuzzy C-means clustering analysis on the matrix D, and realizing single-phase earth fault line selection by using a membership matrix, wherein a target function of the fuzzy C-means clustering and the membership matrix are as follows:
wherein M is fuzzy weighted index, M =2, n is total number of lines, d j For the dynamic pattern matching distance of the jth line to all lines, d j ＝[d j1 ,d j2 ,…,d jn ]；h i Representing the cluster center vector, h i ＝[h 1 ,h 2 ](ii) a J denotes an objective function, U denotes a membership matrix, H denotes a cluster center, U denotes a cluster center ij Indicating that the jth sample belongs to the ith classDegree of membership;
after the objective function J converges, a membership degree matrix U and a clustering center H, U are obtained ij The following conditions need to be satisfied:
further obtaining a membership matrix U:
2. the method of claim 1, wherein: in step 1, a method of determining a value of k and a value of b, comprising the steps of: the dynamic pattern matching distance between the lines is related to k and b, and is regarded as a function of k and b;
defining the mean dynamic pattern matching distance D between the faulty line and the non-faulty line g Average dynamic pattern matching distance D between (k, b) and non-faulty line f (k, b) the expression of which is as follows:
d ij the meaning is the same as formula (6), A is a fault line set, B is a non-fault line set, n is the number of feeder lines, and p is the number of fault lines;
defining a fault discrimination Q (k, b), wherein the expression is as follows:
the first step is as follows: setting a line fault for the determined network structure, and simulating to obtain zero-sequence current data under different sampling frequencies f;
the second step: selecting data of a certain specific sampling frequency as a sample;
the third step: setting an iteration initial value k =2, b =2, the step length is 1, the threshold value k is less than or equal to 20, and b is less than or equal to 10;
the fourth step: calculating positive integers k and b when the fault discrimination Q (k, b) is maximum by adopting a genetic algorithm;
the fifth step: changing the sampling frequency and jumping to the second step;
and a sixth step: changing a fault line and jumping to the first step;
the seventh step: and (5) drawing a k-f, b-f relation curve, and finding k and b for a specific sampling frequency comparison curve.
3. The method of claim 1, wherein: in step 4, the distance matrix R is:
where r (i, j) is the cumulative distance, r (0, 0) =0, r (j, 0) = r (0, i) = ∞, the effective path is to satisfy three constraints:
the characteristics of the bounding: s is more than or equal to max (m, n) and less than or equal to m + n-1, and S is the total number of walking steps; and (3) boundary limitation: the starting point is (1, 1), and the end point is (m, n); continuity: the case of local jumps is not allowed.
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