Intelligent diagnosis and early warning system for power grid faults

Abstract

The invention belongs to the technical field of power grid fault diagnosis, and discloses an intelligent diagnosis and early warning system for power grid faults. Comprising the following steps: constructing a power grid trend graph, and marking the constructed power grid trend graph; collecting power grid operation data, and mapping the collected power grid operation data into the power grid trend graph; obtaining an output efficiency ratio, related power grid data and standard power grid data according to the power grid operation data, obtaining an equipment fault evaluation coefficient according to the power grid trend graph, the output efficiency ratio and the related power grid data, constructing a power change broken line graph according to the standard power grid data, and obtaining a line fault evaluation coefficient according to the power change broken line graph; obtaining a joint fault evaluation coefficient according to the line fault evaluation coefficient; and performing fault early warning on the power grid according to the equipment fault evaluation coefficient, the line fault evaluation coefficient and the combined fault evaluation coefficient. And the accuracy of power grid fault diagnosis and the timeliness of early warning are further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power grid fault diagnosis, and more specifically, to a power grid fault intelligent diagnosis and early warning system. Background Art

[0002] The patent application with the publication number CN117554746A discloses a distribution network fault diagnosis system based on digital twins, including a model building module, a data acquisition module, a fault parameter acquisition module, a fault parameter acquisition module, a fault parameter analysis module, a fault diagnosis evaluation module and a fault warning module. By establishing a digital twin model, the actual operation of the distribution network is simulated, the fault parameter value of the distribution network is obtained, and the stability evaluation index, environmental impact index and abnormal loss performance index of the distribution network are further obtained. The quality evaluation coefficient is analyzed and compared with the preset quality evaluation coefficient. The digital twin model is used to extract abnormal state features and perform corresponding warning processing to improve the reliability and stability of the distribution network. More advanced and intelligent fault diagnosis technology is used to realize real-time monitoring and fault warning of the distribution network, and improve the accuracy and efficiency of fault detection.

[0003] However, in the process of fault monitoring of the power grid, fault monitoring is not performed separately on the equipment in the power grid and the transmission lines in the power grid, which makes it unclear whether the fault location is in the equipment or the transmission line, and the source of the fault cannot be understood. The data of various power grids are not combined, and the mutual influence relationship between the power grid data is not considered, which leads to inaccurate fault detection results, shortens the life of the equipment and transmission lines in the power grid, and cannot ensure the safe operation of the power grid.

[0004] In view of this, the present invention proposes a power grid fault intelligent diagnosis and early warning system to solve the above problems. Summary of the invention

[0005] In order to overcome the above-mentioned defects of the prior art and to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a power grid fault intelligent diagnosis and early warning system, comprising:

[0006] A power grid diagram construction module, used to construct a power grid trend diagram and annotate the constructed power grid trend diagram;

[0007] A data acquisition module is used to collect power grid operation data and map the collected power grid operation data into a power grid trend diagram;

[0008] A data analysis module is used to obtain an output efficiency ratio, relevant power grid data and standard power grid data according to power grid operation data, obtain an equipment fault assessment coefficient according to a power grid trend diagram, the output efficiency ratio and relevant power grid data, construct a power change line graph according to standard power grid data, obtain a line fault assessment coefficient according to the power change line graph, and obtain a joint fault assessment coefficient according to the line fault assessment coefficient;

[0009] The fault warning module is used to provide fault warning for equipment in the power grid according to the equipment fault assessment coefficient, and to provide fault warning for transmission lines in the power grid according to the line fault assessment coefficient and the joint fault assessment coefficient; each module is connected by wire and / or wireless means.

[0010] Furthermore, the process of constructing a power grid trend map and marking the constructed power grid trend map includes:

[0011] Acquire the actual distribution of the power grid, and construct a power grid trend map according to the actual distribution of the power grid, wherein the power grid trend map is composed of power generation nodes, transformer nodes, distribution nodes, and straight lines connecting the power generation nodes, transformer nodes, and distribution nodes;

[0012] According to the actual distribution of the power grid, the positions and connection relationships of the power generation nodes, transformer nodes, and distribution nodes, as well as the lengths of the straight lines connecting the power generation nodes, transformer nodes, and distribution nodes are obtained respectively; according to the connection relationships among the power generation nodes, transformer nodes, and distribution nodes, as well as the lengths of the straight lines connecting the power generation nodes, transformer nodes, and distribution nodes, the power generation nodes, transformer nodes, and distribution nodes are connected to obtain a power grid trend diagram;

[0013] The current direction between power stations, transformers and distribution equipment is obtained, and the power grid direction diagram is marked according to the current direction between power stations, transformers and distribution equipment. The marking process is to add arrows in the middle of the straight lines between the power generation nodes, transformation nodes and distribution nodes, and the arrows point in the same direction as the current.

[0014] Furthermore, the process of collecting the grid operation data and mapping the collected grid operation data into the grid trend diagram includes:

[0015] The grid operation data includes current, voltage, temperature and power, and the power includes input power and output power;

[0016] Setting an operation data acquisition unit, wherein the operation data acquisition unit is used to collect power grid operation data;

[0017] The power grid operation data is collected based on the operation data collection unit to obtain the power of the power station, transformer and distribution equipment, the current, voltage and temperature of the transmission line between the power station, transformer and distribution equipment, and the power of the power station, transformer and distribution equipment is mapped to the corresponding power generation node, transformation node and distribution node, and the current, voltage and temperature of the transmission line between the power station, transformer and distribution equipment is mapped to the straight line between the corresponding power generation node, transformation node and distribution node.

[0018] Furthermore, the process of obtaining the output power efficiency ratio, relevant power grid data and standard power grid data according to the power grid operation data includes:

[0019] Obtain the number of straight lines connected to the nodes, the nodes include power generation nodes, transformer nodes and distribution nodes, record the straight line with the tail of the arrow pointing to the node as the output straight line, and obtain the number of the output straight lines;

[0020] Obtaining the output power efficiency ratio of the node according to the input power and output power of the node;

[0021] i is the index of the node, CB i is the output efficiency ratio of the ith node, ZC i is the number of output lines of the ith node, WR i is the input power of the ith node, j is the index of the output line, WC ij is the output power of the jth output line of the ith node;

[0022] Obtain relevant grid data of the node according to the current, voltage and temperature in the straight line connected to the node;

[0023] The standard grid data includes standard current, standard voltage and standard temperature, and the standard current, standard voltage and standard temperature in the straight line are obtained according to the current, voltage and temperature in the straight line;

[0025] a is the index of the line, IB a is the standard current in the ath straight line, UB a is the standard voltage in the ath straight line, TB a is the standard temperature in the ath straight line, and ∈ are both positive and I a is the current in the ath straight line, U a is the voltage in the ath straight line, T a is the temperature within the ath straight line.

[0026] Further, the relevant power grid data includes relevant current, relevant voltage and relevant temperature;

[0027] k is the index of the line connected to the node, IX i is the relevant current of the ith node, UX i is the voltage of the ith node, TX i is the relevant temperature of the ith node, Z i is the number of lines connected to the i-th node, I ik is the current in the kth straight line connected to the ith node, U ik is the voltage in the kth straight line connected to the ith node, T ik is the temperature within the kth straight line connected to the ith node.

[0028] Furthermore, the process of obtaining the equipment fault assessment coefficient according to the power grid trend diagram, the output efficiency ratio and the relevant power grid data includes:

[0029] Get the length of the straight line connected to the node, and get the relevant length of the node according to the length of the straight line connected to the node;

[0030] Obtain the maximum and minimum values ​​of the number of straight lines connected to the node, the inverse of the output power efficiency ratio of the node, the relevant current, the relevant voltage, the relevant temperature and the relevant length;

[0031] Obtaining a device failure assessment coefficient of a node according to the number of straight lines connected to the node, an output power efficiency ratio of the node, a related current, a related voltage, a related temperature, a related length, a maximum value, and a minimum value;

[0033] kp_1, kp_2, kp_3, kp_4 are adjustment coefficients, GZP i is the equipment fault assessment coefficient of the ith node, θ and μ are both positive and μ>θ, GL imax and GL imin are the maximum and minimum values ​​of the number of straight lines connected to the i-th node, the inverse of the node's output power efficiency ratio, the relevant current, the relevant voltage, the relevant temperature and the relevant length, TX i is the relevant temperature of the ith node, LX i is the correlation length of the ith node, IX i is the relevant current of the ith node, UX i is the voltage associated with the ith node.

[0034] Furthermore, the process of constructing a power change line graph based on standard power grid data includes:

[0035] The power change line graph includes a standard current change line graph, a standard voltage line graph and a standard temperature change line graph;

[0036] Construct a two-dimensional rectangular coordinate system of time with respect to the standard current, map the standard current into the two-dimensional rectangular coordinate system of time with respect to the standard current, generate corresponding standard current sample points, connect each standard current sample point in sequence through a broken line in time sequence, and obtain a standard current change broken line graph;

[0037] A standard voltage line graph and a standard temperature change line graph are constructed based on the process of constructing a standard current change line graph.

[0038] Furthermore, the process of obtaining the line fault assessment coefficient according to the power change line graph includes:

[0039] The line fault assessment coefficient includes a current fault assessment coefficient, a voltage fault assessment coefficient and a temperature fault assessment coefficient;

[0040] Draw a perpendicular line through the standard current sample point and the horizontal axis, draw a perpendicular line through the previous standard current sample point and the vertical axis, obtain the intersection of the two perpendicular lines, record the intersection of the two perpendicular lines as the standard current intersection point, and obtain the area of ​​the right triangle formed by the standard current sample point, the previous standard current sample point and the standard current intersection point;

[0041] Obtaining the slope of a line segment between a standard current sample point and a previous standard current sample point of the standard current sample point;

[0042] Obtain a current fault assessment coefficient of the standard current sample point according to the standard current corresponding to the standard current sample point, the area and slope of the right triangle;

[0043] Based on the acquisition process of the current fault evaluation coefficient, the voltage fault evaluation coefficient and the temperature fault evaluation coefficient are obtained.

[0044] Further, the process of obtaining the joint fault assessment coefficient according to the line fault assessment coefficient includes:

[0045] Obtaining a combined fault assessment coefficient according to a current fault assessment coefficient, a voltage fault assessment coefficient, and a temperature fault assessment coefficient;

[0047] α, z, β, γ, δ, d, σ and τ are adjustment factors, b is the index of the standard current sample point, standard voltage sample point and standard temperature sample point, LHG abis the combined fault evaluation coefficient of the b-th standard current sample point, standard voltage sample point, and standard temperature sample point in the power change line graph within the a-th straight line, DL ab is the current fault evaluation coefficient of the b-th standard current sample point in the standard current change line graph within the a-th straight line, DY ab is the voltage fault evaluation coefficient of the b-th standard voltage sample point in the standard voltage change line graph within the a-th straight line, DW ab is the temperature fault evaluation coefficient of the b-th standard temperature sample point in the standard temperature change line graph within the a-th straight line.

[0048] Furthermore, the process of performing fault early warning on the equipment in the power grid based on the equipment fault evaluation coefficient and performing fault early warning on the transmission lines in the power grid based on the line fault evaluation coefficient and the combined fault evaluation coefficient includes:

[0049] Set the threshold range (GZP0, GZP1) of the equipment fault evaluation coefficient;

[0050] Perform early warning on the corresponding power generation station, transformer, or distribution equipment according to the comparison result between the equipment fault evaluation coefficient of the node and the threshold range of the equipment fault evaluation coefficient;

[0051] When GZP i < GZP0, the power generation station, transformer, and distribution equipment are operating normally, and no operation is performed;

[0052] When 0 ≤ GZP i ≤ GZP1, the power generation station, transformer, and distribution equipment have high operating power consumption, a yellow early warning is issued, and relevant personnel are dispatched to maintain the corresponding power generation station, transformer, or distribution equipment;

[0053] When GZP i > GZP1, the power generation station, transformer, or distribution equipment is operating abnormally, an orange early warning is issued, and relevant personnel are dispatched to repair the corresponding power generation station, transformer, or distribution equipment;

[0054] Set the threshold of the current fault evaluation coefficient, the threshold of the voltage fault evaluation coefficient, the threshold of the temperature fault evaluation coefficient, and the threshold of the combined fault evaluation coefficient;

[0055] When the current fault evaluation coefficient is greater than the current fault evaluation coefficient threshold, the voltage fault evaluation coefficient is greater than the voltage fault evaluation coefficient threshold, the temperature fault evaluation coefficient is greater than the temperature fault evaluation coefficient threshold, or the combined fault evaluation coefficient is greater than the combined fault evaluation coefficient threshold, a fault occurs in the transmission line, a red early warning is issued, and relevant personnel are dispatched to repair the corresponding transmission line;

[0056] When the current fault assessment coefficient is less than or equal to the current fault assessment coefficient threshold, the voltage fault assessment coefficient is less than or equal to the voltage fault assessment coefficient threshold, the temperature fault assessment coefficient is less than or equal to the temperature fault assessment coefficient threshold, and the joint fault assessment coefficient is less than or equal to the joint fault assessment coefficient threshold, the transmission line is normal and no operation is performed.

[0057] The technical effects and advantages of the intelligent diagnosis and early warning system for power grid faults of the present invention are as follows:

[0058] A power grid trend map is constructed and annotated, power grid operation data is collected and mapped to the power grid trend map, output efficiency ratio, relevant power grid data and standard power grid data are obtained according to the power grid operation data, equipment fault assessment coefficient is obtained according to the power grid trend map, output efficiency ratio and relevant power grid data, a power change line graph is constructed according to the standard power grid data, line fault assessment coefficient is obtained according to the power change line graph, joint fault assessment coefficient is obtained according to the line fault assessment coefficient, and fault warning of the power grid is carried out according to the equipment fault assessment coefficient, line fault assessment coefficient and joint fault assessment coefficient; fault monitoring is carried out on the equipment in the power grid and the transmission lines in the power grid respectively, so as to judge whether the fault location is in the equipment or the transmission line, and know the source of the fault, consider the mutual influence relationship between the power grid data, combine the various power grid data, and perform fault detection on the power grid according to the combined data, thereby further improving the accuracy of power grid fault diagnosis and the timeliness of early warning, increasing the life of the equipment and transmission lines in the power grid, and ensuring the safe operation of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 It is a schematic diagram of an intelligent diagnosis and early warning system for power grid faults of the present invention. DETAILED DESCRIPTION

[0060] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0061] Example 1

[0062] See also Figure 1 As shown, the intelligent diagnosis and early warning system for power grid faults described in this embodiment includes: a power grid diagram construction module, which is used to construct a power grid trend diagram and mark the constructed power grid trend diagram;

[0063] A data acquisition module is used to collect power grid operation data and map the collected power grid operation data into a power grid trend diagram;

[0064] A data analysis module is used to obtain an output efficiency ratio, relevant power grid data and standard power grid data according to power grid operation data, obtain an equipment fault assessment coefficient according to a power grid trend diagram, the output efficiency ratio and relevant power grid data, construct a power change line graph according to standard power grid data, obtain a line fault assessment coefficient according to the power change line graph, and obtain a joint fault assessment coefficient according to the line fault assessment coefficient;

[0065] The fault warning module is used to provide fault warning for equipment in the power grid according to the equipment fault assessment coefficient, and to provide fault warning for transmission lines in the power grid according to the line fault assessment coefficient and the joint fault assessment coefficient.

[0066] Furthermore, the process of constructing a power grid trend map and marking the constructed power grid trend map includes:

[0067] Obtaining actual power grid distribution, including the location of power stations, transformers, and distribution equipment, the connection relationship between power stations, transformers, and distribution equipment, the connection between power stations, transformers, and distribution equipment through transmission lines, and the length of transmission lines between power stations, transformers, and distribution equipment;

[0068] Constructing a power grid trend diagram according to the actual power grid distribution, wherein the power grid trend diagram is composed of power generation nodes, transformer nodes, distribution nodes, and straight lines connecting the power generation nodes, transformer nodes, and distribution nodes;

[0069] According to the positions of the power station, transformer and distribution equipment, the positions of the power generation node, transformer node and distribution node in the power grid trend diagram are respectively obtained; according to the connection relationship between the power station, transformer and distribution equipment, the connection relationship between the power generation node, transformer node and distribution node in the power grid trend diagram is obtained; according to the connection relationship between the power generation node, transformer node and distribution node, the power generation node, transformer node and distribution node are connected by a straight line, and the length of the straight line is obtained by proportionally reducing the length of the transmission line between the power station, transformer and distribution equipment, so as to obtain the power grid trend diagram;

[0070] The current direction between the power station, transformer and distribution equipment is obtained, and the constructed power grid direction diagram is annotated according to the current direction between the power station, transformer and distribution equipment. The annotation process is to add arrows in the middle of the straight lines between the power generation node, transformer node and distribution node. If the current direction is from the power station to the transformer, an arrow is added in the middle of the straight line between the power generation node and the transformer node, and the arrow points to the transformer node. If the current direction is from the transformer to the distribution equipment, an arrow is added in the middle of the straight line between the transformer node and the distribution node, and the arrow points to the distribution node. And so on, the unannotated straight lines in the power grid direction diagram are annotated.

[0071] Furthermore, the process of collecting the grid operation data and mapping the collected grid operation data into the grid trend diagram includes:

[0072] The grid operation data includes current, voltage, temperature and power, and the power includes input power and output power;

[0073] Setting an operation data acquisition unit, wherein the operation data acquisition unit is used to collect power grid operation data;

[0074] Based on the operation data acquisition unit, the power grid operation data is collected to obtain the power of the power station, transformer and distribution equipment, the current, voltage and temperature of the transmission line between the power station, transformer and distribution equipment, the temperature of the transmission line is the highest temperature in the entire transmission line, the power of the power station, transformer and distribution equipment is mapped to the corresponding power generation node, transformer node and distribution node, and the current, voltage and temperature of the transmission line between the power station, transformer and distribution equipment is mapped to the straight line between the corresponding power generation node, transformer node and distribution node;

[0075] For example, the power grid trend diagram includes a power generation node, two transformer nodes and two distribution nodes. One of the transformer nodes is recorded as the first transformer node, the other transformer node is recorded as the second transformer node, one of the distribution nodes is recorded as the first distribution node, and the other distribution node is recorded as the second distribution node. The current direction is from the power generation node to the transformer node and from the transformer node to the distribution node. The input power of the power station is 10 kilowatts, the output power to the first transformer is 4 kilowatts, and the output power to the second transformer is 4.5 kilowatts. The input power and output power of the power station are mapped to the power generation node, and the output power of 4 kilowatts is associated with the straight line between the power generation node and the first transformer node, and the output power of 4.5 kilowatts is associated with the straight line between the power generation node and the second transformer node. Based on the mapping of the input power and output power of the power station, the unmapped part of the power grid trend diagram is mapped.

[0076] Further, the process of obtaining the output efficiency ratio, relevant grid data and standard grid data according to the grid operation data, obtaining the equipment fault assessment coefficient according to the grid trend diagram, the output efficiency ratio and the relevant grid data, constructing a power change line graph according to the standard grid data, obtaining the line fault assessment coefficient according to the power change line graph, and obtaining the joint fault assessment coefficient according to the line fault assessment coefficient includes:

[0077] Obtain the number of straight lines connected to the nodes, the nodes include power generation nodes, transformer nodes and distribution nodes, record the straight line with the tail of the arrow pointing to the node as the output straight line, and obtain the number of the output straight lines;

[0078] Obtaining the output power efficiency ratio of the node according to the input power and output power of the node;

[0079] i is the index of the node, i = 1, 2, ..., n, n is a positive integer, CB i is the output efficiency ratio of the ith node, ZC i is the number of output lines of the ith node, WR i is the input power of the ith node, j is the index of the output line, WC ij is the output power of the jth output line of the ith node;

[0080] Obtain relevant grid data of the node according to the current, voltage and temperature in the straight line connected to the node, wherein the relevant grid data includes relevant current, relevant voltage and relevant temperature;

[0081] k is the index of the line connected to the node, IX i is the relevant current of the ith node, UX i is the voltage of the ith node, TX i is the relevant temperature of the ith node, Z i is the number of lines connected to the i-th node, I ik is the current in the kth straight line connected to the ith node, U ik is the voltage in the kth straight line connected to the ith node, T ik is the temperature in the kth straight line connected to the ith node;

[0082] Get the length of the straight line connected to the node, and get the relevant length of the node according to the length of the straight line connected to the node;

[0083] LD ik is the length of the kth straight line connected to the ith node, LX i is the correlation length of the i-th node;

[0084] Get the maximum value of the number of straight lines connected to the node, the inverse of the node's output power efficiency ratio, the related current, the related voltage, the related temperature, and the related length GL imax and minimum GL imin ;

[0085] GL imax is the maximum value among the number of straight lines connected to the i-th node, the inverse of the output power efficiency ratio of the node, the relevant current, the relevant voltage, the relevant temperature and the relevant length;

[0086] GL imin is the minimum value among the number of straight lines connected to the i-th node, the inverse of the output power efficiency ratio of the node, the relevant current, the relevant voltage, the relevant temperature and the relevant length;

[0087] Obtaining a device fault assessment coefficient of a node according to the number of straight lines connected to the node, the inverse of the output power efficiency ratio of the node, a related current, a related voltage, a related temperature, a related length, a maximum value, and a minimum value;

[0089] kp_1, kp_2, kp_3, kp_4 are adjustment coefficients, GZP i is the equipment fault assessment coefficient of the ith node, θ and μ are both positive and μ>θ, GL imax and GL imin are the maximum and minimum values ​​of the number of straight lines connected to the i-th node, the inverse of the node's output power efficiency ratio, the relevant current, the relevant voltage, the relevant temperature and the relevant length, TX i is the relevant temperature of the ith node, LX i is the correlation length of the ith node, IX i is the relevant current of the ith node, UX i is the relevant voltage of the i-th node;

[0090] The standard grid data includes standard current, standard voltage and standard temperature, and the standard current, standard voltage and standard temperature in the straight line are obtained according to the current, voltage and temperature in the straight line;

[0092] a is the index of the line, IB a is the standard current in the ath straight line, UB a is the standard voltage in the ath straight line, TB a is the standard temperature in the ath straight line, and ∈ are both positive and Ia is the current in the ath straight line, U a is the voltage in the ath straight line, T a is the temperature within the ath straight line;

[0093] Constructing a power change line graph according to the standard power grid data in the straight line, wherein the power change line graph includes a standard current change line graph, a standard voltage line graph and a standard temperature change line graph;

[0094] Construct a two-dimensional rectangular coordinate system of time with respect to the standard current, map the standard current into the two-dimensional rectangular coordinate system of time with respect to the standard current, generate corresponding standard current sample points, connect each standard current sample point in sequence through a broken line in time sequence, and obtain a standard current change broken line graph;

[0095] Construct a two-dimensional rectangular coordinate system of time with respect to the standard voltage, map the standard voltage into the two-dimensional rectangular coordinate system of time with respect to the standard voltage, generate corresponding standard voltage sample points, connect each standard voltage sample point in sequence through a broken line in chronological order, and obtain a standard voltage change broken line graph;

[0096] Construct a two-dimensional rectangular coordinate system of time with respect to standard temperature, map the standard temperature into the two-dimensional rectangular coordinate system of time with respect to standard temperature, generate corresponding standard temperature sample points, connect each standard temperature sample point in sequence through a broken line in chronological order, and obtain a standard temperature change broken line graph;

[0097] The line fault assessment coefficient includes a current fault assessment coefficient, a voltage fault assessment coefficient and a temperature fault assessment coefficient;

[0098] Draw a perpendicular line through the standard current sample point to the horizontal axis, draw a perpendicular line through the previous standard current sample point to the vertical axis, obtain the intersection of the two perpendicular lines, record the intersection of the two perpendicular lines as the standard current intersection point, and obtain the area SL of the right triangle formed by the standard current sample point, the previous standard current sample point and the standard current intersection point ab ;

[0099] Get the slope KL of the line segment between the standard current sample point and the previous standard current sample point of the standard current sample point ab ;

[0100] Obtain a current fault assessment coefficient of the standard current sample point according to the standard current corresponding to the standard current sample point, the area and slope of the right triangle;

[0101] DL ab =IB ab +tj_1×SL ab ×KL ab; b is the index of the standard current sample point, SL ab is the area of ​​the right triangle corresponding to the bth standard current sample point in the standard current variation line graph within the ath straight line, tj_1 is the adjustment coefficient, KL ab IB is the slope of the line segment corresponding to the bth standard current sample point in the standard current variation line graph within the ath straight line. ab is the standard current corresponding to the bth standard current sample point in the standard current variation line graph within the ath straight line, DL ab is the current fault assessment coefficient of the bth standard current sample point in the standard current variation line graph within the ath straight line;

[0102] The indexes of the standard current sample point, standard voltage sample point and standard temperature sample point that need to be explained are all b;

[0103] Draw a perpendicular line through the standard voltage sample point to the horizontal axis, draw a perpendicular line through the previous standard voltage sample point to the vertical axis, obtain the intersection of the two perpendicular lines, record the intersection of the two perpendicular lines as the standard voltage intersection point, and obtain the area SY of the right triangle formed by the standard voltage sample point, the previous standard voltage sample point of the standard voltage sample point, and the standard voltage intersection point ab ;

[0104] Get the slope KY of the line segment between the standard voltage sample point and the previous standard voltage sample point of the standard voltage sample point ab ;

[0105] According to the standard voltage UB corresponding to the standard voltage sample point ab , the area and slope of the right triangle to obtain the voltage fault assessment coefficient of the standard voltage sample point;

[0106] DY ab =UB ab +tj_2×SY ab ×KY ab ; tj_2 is the adjustment coefficient; SY ab KY is the area of ​​the right triangle corresponding to the bth standard voltage sample point in the standard voltage variation line graph within the ath straight line, ab UB is the slope of the line segment corresponding to the bth standard voltage sample point in the standard voltage variation line graph within the ath straight line. ab is the standard voltage corresponding to the bth standard voltage sample point in the standard voltage variation line graph within the ath straight line, DY ab is the voltage fault assessment coefficient of the bth standard voltage sample point in the standard voltage variation line graph within the ath straight line;

[0107] Draw a perpendicular line through the standard temperature sample point to the horizontal axis, and draw a perpendicular line through the previous standard temperature sample point to the vertical axis to obtain the intersection of the two perpendicular lines. The intersection of the two perpendicular lines is recorded as the standard temperature intersection point, and the area SW of the right triangle formed by the standard temperature sample point, the previous standard temperature sample point of the standard temperature sample point, and the standard temperature intersection point is obtained. ab ;

[0108] Get the slope KW of the line segment between the standard temperature sample point and the previous standard temperature sample point of the standard temperature sample point ab ;

[0109] The temperature fault assessment coefficient of the standard temperature sample point is obtained according to the standard temperature corresponding to the standard temperature sample point, the area and slope of the right triangle;

[0110] DW ab =TB ab +tj_3×SW ab ×KW ab ; tj_3 is the adjustment coefficient; SW ab KW is the area of ​​the right triangle corresponding to the bth standard temperature sample point in the standard temperature variation line graph within the ath straight line. ab TB is the slope of the line segment corresponding to the bth standard temperature sample point in the standard temperature variation line graph within the ath straight line. ab DW is the standard temperature corresponding to the bth standard temperature sample point in the standard temperature variation line graph within the ath straight line. ab is the temperature fault assessment coefficient of the bth standard temperature sample point in the standard temperature variation line graph within the ath straight line;

[0111] Obtaining a combined fault assessment coefficient according to a current fault assessment coefficient, a voltage fault assessment coefficient, and a temperature fault assessment coefficient;

[0113] α, z, β, γ, δ, d, σ and τ are adjustment factors, LHG ab It is the joint fault assessment coefficient of the bth standard current sample point, standard voltage sample point and standard temperature sample point in the power variation line graph within the ath straight line.

[0114] Furthermore, the process of providing a fault warning for equipment in the power grid according to the equipment fault assessment coefficient and providing a fault warning for a transmission line in the power grid according to the line fault assessment coefficient and the combined fault assessment coefficient includes:

[0115] Set the device fault assessment coefficient threshold range (GZP0, GZP1);

[0116] Warnings are issued for the corresponding power station, transformer, or distribution equipment according to the comparison result between the equipment failure evaluation coefficient of the node and the threshold range of the equipment failure evaluation coefficient;

[0117] When GZP i < When GZP < 0, the power station, transformer, and distribution equipment are operating normally, and no operation is performed;

[0118] When 0 ≤ GZP i ≤ GZP1, the power consumption of the power station, transformer, and distribution equipment is large, a yellow warning is issued, and relevant personnel are dispatched to maintain the corresponding power station, transformer, or distribution equipment;

[0119] When GZP i > GZP1, the power station, transformer, or distribution equipment is operating abnormally, an orange warning is issued, and relevant personnel are dispatched to repair the corresponding power station, transformer, or distribution equipment;

[0120] Set the threshold of the current failure evaluation coefficient, the threshold of the voltage failure evaluation coefficient, the threshold of the temperature failure evaluation coefficient, and the threshold of the combined failure evaluation coefficient;

[0121] When the current failure evaluation coefficient is greater than the current failure evaluation coefficient threshold, the voltage failure evaluation coefficient is greater than the voltage failure evaluation coefficient threshold, the temperature failure evaluation coefficient is greater than the temperature failure evaluation coefficient threshold, or the combined failure evaluation coefficient is greater than the combined failure evaluation coefficient threshold, a fault occurs in the transmission line, a red warning is issued, and relevant personnel are dispatched to repair the corresponding transmission line;

[0122] When the current failure evaluation coefficient is less than or equal to the current failure evaluation coefficient threshold, the voltage failure evaluation coefficient is less than or equal to the voltage failure evaluation coefficient threshold, the temperature failure evaluation coefficient is less than or equal to the temperature failure evaluation coefficient threshold, and the combined failure evaluation coefficient is less than or equal to the combined failure evaluation coefficient threshold, the transmission line is normal and no operation is performed.

[0123] In this embodiment, the faults of the equipment in the power grid and the transmission lines in the power grid are monitored respectively, so as to judge whether the fault location is in the equipment or the transmission line, know the source of the fault, consider the mutual influence relationship between the power grid data, combine the various power grid data, and perform fault detection on the power grid according to the combined data, thereby further improving the accuracy of power grid fault diagnosis and the timeliness of early warning, increasing the service life of the equipment and transmission lines in the power grid, and ensuring the safe operation of the power grid.

[0124] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed in the present invention can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0125] In the several embodiments provided by the present invention, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of the units is only one, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0126] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0127] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An intelligent diagnosis and early warning system for power grid faults, characterized in that: The power grid fault intelligent diagnosis and early warning system comprises: A power grid diagram construction module, used to construct a power grid trend diagram and annotate the constructed power grid trend diagram; A data acquisition module is used to collect power grid operation data and map the collected power grid operation data into a power grid trend diagram; A data analysis module is used to obtain an output efficiency ratio, relevant power grid data and standard power grid data according to power grid operation data, obtain an equipment fault assessment coefficient according to a power grid trend diagram, the output efficiency ratio and relevant power grid data, construct a power change line graph according to standard power grid data, obtain a line fault assessment coefficient according to the power change line graph, and obtain a joint fault assessment coefficient according to the line fault assessment coefficient; A fault warning module is used to provide fault warnings for equipment in the power grid according to the equipment fault assessment coefficient, and to provide fault warnings for transmission lines in the power grid according to the line fault assessment coefficient and the combined fault assessment coefficient; The modules are connected to each other via wired and / or wireless means.

2. The intelligent diagnosis and early warning system for power grid faults according to claim 1 is characterized in that: The process of constructing a power grid trend map and marking the constructed power grid trend map includes: Acquire the actual distribution of the power grid, and construct a power grid trend map according to the actual distribution of the power grid, wherein the power grid trend map is composed of power generation nodes, transformer nodes, distribution nodes, and straight lines connecting the power generation nodes, transformer nodes, and distribution nodes; According to the actual distribution of the power grid, the positions and connection relationships of the power generation nodes, transformer nodes, and distribution nodes, as well as the lengths of the straight lines connecting the power generation nodes, transformer nodes, and distribution nodes are obtained respectively; according to the connection relationships among the power generation nodes, transformer nodes, and distribution nodes, as well as the lengths of the straight lines connecting the power generation nodes, transformer nodes, and distribution nodes, the power generation nodes, transformer nodes, and distribution nodes are connected to obtain a power grid trend diagram; The current direction between power stations, transformers and distribution equipment is obtained, and the power grid direction diagram is marked according to the current direction between power stations, transformers and distribution equipment. The marking process is to add arrows in the middle of the straight lines between the power generation nodes, transformation nodes and distribution nodes, and the arrows point in the same direction as the current.

3. The intelligent diagnosis and early warning system for power grid faults according to claim 2 is characterized in that: The process of collecting the grid operation data and mapping the collected grid operation data into the grid trend diagram includes: The grid operation data includes current, voltage, temperature and power, and the power includes input power and output power; Setting an operation data acquisition unit, wherein the operation data acquisition unit is used to collect power grid operation data; The power grid operation data is collected based on the operation data collection unit to obtain the power of the power station, transformer and distribution equipment, the current, voltage and temperature of the transmission line between the power station, transformer and distribution equipment, and the power of the power station, transformer and distribution equipment is mapped to the corresponding power generation node, transformation node and distribution node, and the current, voltage and temperature of the transmission line between the power station, transformer and distribution equipment is mapped to the straight line between the corresponding power generation node, transformation node and distribution node.

4. The intelligent diagnosis and early warning system for power grid faults according to claim 3 is characterized in that: The process of obtaining the output power efficiency ratio, relevant power grid data and standard power grid data according to the power grid operation data includes: Obtain the number of straight lines connected to the nodes, the nodes include power generation nodes, transformer nodes and distribution nodes, record the straight line with the tail of the arrow pointing to the node as the output straight line, and obtain the number of the output straight lines; Obtaining the output power efficiency ratio of the node according to the input power and output power of the node; i is the index of the node, CB i is the output efficiency ratio of the ith node, ZC i is the number of output lines of the ith node, WR i is the input power of the ith node, j is the index of the output line, WC ij is the output power of the jth output line of the ith node; Obtain relevant grid data of the node according to the current, voltage and temperature in the straight line connected to the node; The standard grid data includes standard current, standard voltage and standard temperature, and the standard current, standard voltage and standard temperature in the straight line are obtained according to the current, voltage and temperature in the straight line; a is the index of the line, IB a is the standard current in the ath straight line, UB a is the standard voltage in the ath straight line, TB a is the standard temperature in the ath straight line, θ and ∈ are both positive numbers and ∈>θ, I a is the current in the ath straight line, U a is the voltage in the ath straight line, T a is the temperature within the ath straight line.

5. The intelligent diagnosis and early warning system for power grid faults according to claim 4 is characterized in that: The relevant power grid data includes relevant current, relevant voltage and relevant temperature; k is the index of the line connected to the node, IX i is the relevant current of the ith node, UX i is the voltage of the ith node, TX i is the relevant temperature of the ith node, Z i is the number of lines connected to the i-th node, I ik is the current in the kth straight line connected to the ith node, U ik is the voltage in the kth straight line connected to the ith node, T ik is the temperature within the kth straight line connected to the ith node.

6. The intelligent diagnosis and early warning system for power grid faults according to claim 5, characterized in that: The process of obtaining the equipment fault assessment coefficient according to the power grid trend diagram, the output efficiency ratio and the relevant power grid data includes: Get the length of the straight line connected to the node, and get the relevant length of the node according to the length of the straight line connected to the node; Obtain the maximum and minimum values ​​of the number of straight lines connected to the node, the inverse of the output power efficiency ratio of the node, the relevant current, the relevant voltage, the relevant temperature and the relevant length; Obtaining a device failure assessment coefficient of a node according to the number of straight lines connected to the node, an output power efficiency ratio of the node, a related current, a related voltage, a related temperature, a related length, a maximum value, and a minimum value; kp_1, kp_2, kp_3, kp_4 are adjustment coefficients, GZP i is the equipment fault assessment coefficient of the ith node, θ and μ are both positive and μ>θ, GL imax and GL imin are the maximum and minimum values ​​of the number of straight lines connected to the i-th node, the inverse of the node's output power efficiency ratio, the relevant current, the relevant voltage, the relevant temperature and the relevant length, TX i is the relevant temperature of the ith node, LX i is the correlation length of the ith node, IX i is the relevant current of the ith node, UX i is the voltage associated with the ith node.

7. The intelligent diagnosis and early warning system for power grid faults according to claim 6 is characterized in that: The process of constructing a power change line graph based on standard power grid data includes: The power change line graph includes a standard current change line graph, a standard voltage line graph and a standard temperature change line graph; Construct a two-dimensional rectangular coordinate system of time with respect to the standard current, map the standard current into the two-dimensional rectangular coordinate system of time with respect to the standard current, generate corresponding standard current sample points, connect each standard current sample point in sequence through a broken line in time sequence, and obtain a standard current change broken line graph; A standard voltage line graph and a standard temperature change line graph are constructed based on the process of constructing a standard current change line graph.

8. The intelligent diagnosis and early warning system for power grid faults according to claim 7 is characterized in that: The process of obtaining the line fault assessment coefficient according to the power change line graph includes: The line fault assessment coefficient includes a current fault assessment coefficient, a voltage fault assessment coefficient and a temperature fault assessment coefficient; Draw a perpendicular line through the standard current sample point and the horizontal axis, draw a perpendicular line through the previous standard current sample point and the vertical axis, obtain the intersection of the two perpendicular lines, record the intersection of the two perpendicular lines as the standard current intersection point, and obtain the area of ​​the right triangle formed by the standard current sample point, the previous standard current sample point and the standard current intersection point; Obtaining the slope of a line segment between a standard current sample point and a previous standard current sample point of the standard current sample point; Obtain a current fault assessment coefficient of the standard current sample point according to the standard current corresponding to the standard current sample point, the area and slope of the right triangle; Based on the acquisition process of the current fault evaluation coefficient, the voltage fault evaluation coefficient and the temperature fault evaluation coefficient are obtained.

9. The intelligent diagnosis and early warning system for power grid faults according to claim 8, characterized in that: The process of obtaining the joint fault assessment coefficient according to the line fault assessment coefficient comprises: Obtaining a combined fault assessment coefficient according to a current fault assessment coefficient, a voltage fault assessment coefficient, and a temperature fault assessment coefficient; α, z, β, γ, δ, d, σ and τ are adjustment factors, b is the index of the standard current sample point, standard voltage sample point and standard temperature sample point, LHG ab is the joint fault assessment coefficient of the bth standard current sample point, standard voltage sample point and standard temperature sample point in the power variation line graph within the ath straight line, DL ab is the current fault assessment coefficient of the bth standard current sample point in the standard current variation line graph within the ath straight line, DY ab is the voltage fault assessment coefficient of the bth standard voltage sample point in the standard voltage variation line graph within the ath straight line, DW ab It is the temperature fault assessment coefficient of the bth standard temperature sample point in the standard temperature change line graph within the ath straight line.

10. The intelligent diagnosis and early warning system for power grid faults according to claim 9, characterized in that: The process of providing fault warning for equipment in the power grid according to the equipment fault assessment coefficient and providing fault warning for the transmission line in the power grid according to the line fault assessment coefficient and the combined fault assessment coefficient comprises: Set the device fault assessment coefficient threshold range (GZP0, GZP1); According to the comparison result between the equipment fault assessment coefficient of the node and the equipment fault assessment coefficient threshold range, an early warning is issued to the corresponding power station, transformer or distribution equipment; When GZP i <When GZP is less than 0, the power station, transformer, and power distribution equipment operate normally without any operation; When GZP 0≤GZP i When ≤GZP1, the power station, transformer and distribution equipment consume a lot of power, a yellow warning is issued, and relevant personnel are dispatched to maintain the corresponding power station, transformer or distribution equipment; When GZP i >GZP1, if the power station, transformer or distribution equipment operates abnormally, an orange warning will be issued and relevant personnel will be dispatched to repair the corresponding power station, transformer or distribution equipment; Setting a current fault assessment coefficient threshold, a voltage fault assessment coefficient threshold, a temperature fault assessment coefficient threshold, and a combined fault assessment coefficient threshold; When the current fault assessment coefficient is greater than the current fault assessment coefficient threshold, the voltage fault assessment coefficient is greater than the voltage fault assessment coefficient threshold, the temperature fault assessment coefficient is greater than the temperature fault assessment coefficient threshold, or the combined fault assessment coefficient is greater than the combined fault assessment coefficient threshold, a transmission line fault occurs, a red warning is issued, and relevant personnel are dispatched to repair the corresponding transmission line; When the current fault assessment coefficient is less than or equal to the current fault assessment coefficient threshold, the voltage fault assessment coefficient is less than or equal to the voltage fault assessment coefficient threshold, the temperature fault assessment coefficient is less than or equal to the temperature fault assessment coefficient threshold, and the joint fault assessment coefficient is less than or equal to the joint fault assessment coefficient threshold, the transmission line is normal and no operation is performed.

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