Operation and maintenance method and system for capacitive voltage transformer of transformer substation

Abstract

The invention discloses a transformer substation capacitor voltage transformer operation and maintenance method and system, and the method comprises the steps: collecting the data of a capacitor voltage transformer in a transformer substation, so as to construct a group data set; according to the group data set, establishing a collaborative operation and maintenance target distribution model to obtain a plurality of collaborative operation and maintenance target distribution schemes in the same time period; establishing a scoring model, and scoring the plurality of collaborative operation and maintenance target allocation schemes; according to the multiple cooperative operation and maintenance target allocation schemes and the scores thereof, based on the cooperative operation and maintenance target allocation model, determining an optimal allocation scheme of the cooperative operation and maintenance targets in each time period; and splicing the optimal allocation schemes of the cooperative operation and maintenance targets according to a time period sequence to obtain an operation and maintenance scheme of the transformer substation capacitor voltage transformer. According to the method, personnel arrangement is reasonably distributed from the aspects of time sequence, space and the like, so that the workload of personnel is reduced, the operation and maintenance efficiency is improved, the defective CVT can be found as early as possible, and the standardization of operation and maintenance management is realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of online monitoring of electric power metering, and more specifically, relates to a method and system for operating and maintaining a capacitor voltage transformer in a substation. Background Art

[0002] As an important part of the electric energy metering device, the metering performance of the transformer is directly related to the accuracy of electric energy metering. Capacitor voltage transformer (CVT) is a voltage transformer that is divided by a series capacitor, and then reduced and isolated by an electromagnetic transformer. As an instrument for converting voltage, compared with conventional electromagnetic voltage transformers, capacitor voltage transformers have many advantages in terms of economy and safety, in addition to high impulse insulation strength, simple manufacturing, small size, and light weight. Therefore, they are widely used in high-voltage substations.

[0003] However, in the actual operation of CVT, due to the influence of the acquisition principle and harsh environment, the measurement deviation may exceed the limit, affecting the measurement accuracy and the safe operation of the power system. Therefore, it is necessary to diagnose its status in time during the operation and maintenance process. The operation and maintenance of CVT is a key link to ensure the safe and reliable operation of the power system. Regular maintenance and inspection can ensure that these devices are in good working condition and provide accurate voltage measurement data, which helps to reduce potential power system risks.

[0004] At present, the traditional substation CVT operation and maintenance method is difficult to avoid the phenomenon of CVT tracking failure caused by human factors such as missed detection, and cannot ensure that CVT abnormalities can be discovered in time. Long-term unified large-scale operation and maintenance will lead to huge human and material resources. Therefore, it is very necessary to determine the operation and maintenance sequence and investment arrangement of substation CVT and formulate an operation and maintenance strategy. Summary of the invention

[0005] In order to solve the deficiencies in the prior art, the present invention provides a method for formulating an operation and maintenance strategy for a capacitive voltage transformer in a substation. Through an operation and maintenance force allocation algorithm, a real-time and effective substation CVT operation and maintenance strategy is formulated to solve the problems of inadequate operation and maintenance inspection and waste of manpower, thereby improving operation and maintenance efficiency.

[0006] The present invention adopts the following technical solution.

[0007] A first aspect of the present invention provides a substation capacitor voltage transformer operation and maintenance method, comprising the following steps:

[0008] Collect capacitor voltage transformer data in substations to construct a population data set;

[0009] According to the group data set, a collaborative operation and maintenance target allocation model is established to obtain multiple collaborative operation and maintenance target allocation schemes within the same period;

[0010] Establish a scoring model to score multiple collaborative operation and maintenance target allocation schemes;

[0011] According to multiple collaborative operation and maintenance target allocation plans and their scores, based on the collaborative operation and maintenance target allocation model, the optimal collaborative operation and maintenance target allocation plan in each time period is determined;

[0012] The optimal allocation plan for each collaborative operation and maintenance target is spliced ​​in chronological order to obtain the operation and maintenance plan for the capacitor voltage transformer of the substation.

[0013] Preferably, the voltage transformers with topological relationship in the substation are taken as a group, and the secondary voltage data output by the group, the secondary load data of the electric energy meter, the operation and maintenance team information within the station and the CVT nameplate year information are collected to form a CVT group data set.

[0014] Preferably, the number of voltage transformer groups is not less than 4.

[0015] Preferably, in the step of establishing the collaborative operation and maintenance target allocation model, the physical quantities related to the CVT and the operation and maintenance working group are modeled as follows:

[0016] C={c 1 ,c 2 ,...,c n} represents the list of CVTs in the station, n is the total number of CVTs in the station;

[0017] P = {p 1 ,p 2 ,...,p m} represents the work group that can be used for operation and maintenance in the station, and m is the number of operation and maintenance work groups;

[0018] U'={u 1 ',u 2 ',...,u n '} represents the secondary voltage amplitude of each CVT;

[0019] Y={y 1 ,y 2 ,...y n} represents the service life of each transformer;

[0020] L = {l 1 ,l 2 ,...,l n} represents the secondary side load of each CVT measured by the secondary side energy meter;

[0021] S 1,t Represents the status of the operation and maintenance team at time t;

[0022] S 2,t represents the status of the CVT group in the station at time t;

[0023] Among them, the state of the operation and maintenance working group at time t and the state of the CVT group in the station at time t constitute the joint state 1,t ,S 2,t >.

[0024] Preferably, by assigning the matrix B t It represents the collaborative operation and maintenance target allocation scheme at the current time t, and the allocation matrix B t It is expressed as the following formula:

[0025]

[0026] Where:

[0027] b i,j is any element of the allocation matrix, representing p j The operation and maintenance team i The degree of reduction of the ratio difference after CVT operation and maintenance, 0 i,j <1, b i,j It is a continuous variable, which is directly calculated from the ratio of the difference data before and after the operation and maintenance action.

[0028] Preferably, the step of determining the optimal allocation scheme for collaborative operation and maintenance objectives in each time period specifically includes:

[0029] Taking the minimum loss of electric energy metering as the objective function, the collaborative operation and maintenance target allocation model is solved according to the objective function and constraints to obtain multiple collaborative operation and maintenance target allocation schemes at the same time;

[0030] Establish a scoring model based on the joint status 1,t ,S 2,t >Score multiple collaborative operation and maintenance target allocation plans, generate an evaluation matrix and input it into the collaborative operation and maintenance target allocation model to optimize the target allocation plan at the current moment.

[0031] Preferably, the objective function F 1 It is expressed as the following formula:

[0032] F 1 =min[f 1 (B),f 2 (B),f 3 (B),f 4 (B)]

[0033]

[0034] Where:

[0035] g 1 ​​​The CVT service life loss is characterized by the ratio difference and the mapping of service life, which is set manually or obtained by learning;

[0036] is the average amplitude of the group CVT secondary voltage,

[0037] Preferably, the constraint condition includes a first constraint condition and a second constraint condition;

[0038] The first constraint is that the correction of the deviation of CVT service life caused by each operation and maintenance shall not exceed the deviation itself, which can be expressed as follows:

[0039]

[0040] The second constraint is that a work group can only operate and maintain one CVT at most, which can be expressed as follows:

[0041] For any 0≤j≤m,

[0042]

[0043] Preferably, the scoring model is constructed based on a neural network and obtained through learning optimization, specifically comprising the following steps:

[0044] Step A.1, the neural network inputs the joint status of the operation and maintenance working group and CVT, calculates the scoring matrix through network forward propagation, and inputs it into the collaborative operation and maintenance target allocation model;

[0045] Step A.2: The collaborative operation and maintenance target allocation model formulates a collaborative operation and maintenance target allocation plan based on the scoring matrix through strategic reasoning, and issues the collaborative operation and maintenance target allocation plan to each operation and maintenance team. Each operation and maintenance team performs the target CVT operation and maintenance task according to a fixed action strategy.

[0046] Step A.3, evaluate the objective function F generated by the single-step execution of the network receiving collaborative operation and maintenance target allocation scheme 1 Value, update the network parameters of the optimization scoring model according to the deviation from the standard value;

[0047] Step A.4, iterate steps A.1 to A.3 until the set termination condition is met, the learning ends, and the scoring model is obtained.

[0048] A second aspect of the present invention provides a substation capacitor voltage transformer operation and maintenance system, which runs the substation capacitor voltage transformer operation and maintenance method, including:

[0049] The data acquisition module is used to collect data of capacitor voltage transformers in the substation and construct a group data set;

[0050] The strategy reasoning module is used to establish a collaborative operation and maintenance target allocation model and generate multiple collaborative operation and maintenance target allocation plans within the same period;

[0051] The strategy evaluation module is used to establish a scoring model to score multiple collaborative operation and maintenance target allocation schemes;

[0052] The optimal allocation module is used to determine the optimal allocation plan for the collaborative operation and maintenance targets in each time period, splice the optimal allocation plans for each collaborative operation and maintenance target in chronological order of the time periods, and output the substation capacitor voltage transformer operation and maintenance plan.

[0053] Compared with the prior art, the beneficial effects of the present invention include at least:

[0054] (1) Through the present invention, multiple staff groups in the station can cooperate to complete the overall operation and maintenance tasks of the substation voltage transformer within the same time range.

[0055] (2) Considering the time sequence, space, etc., reasonable allocation of personnel arrangements is carried out to achieve the best results with the maximum operation and maintenance cost-effectiveness.

[0056] (3) Ensure the safe and stable operation of the smart substation, which not only reduces the workload of personnel and improves the operation and maintenance efficiency, but also can detect defects early and realize the standardized operation and maintenance management. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 It is a schematic diagram of a substation capacitor voltage transformer operation and maintenance method provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The embodiments described in this application are only part of the embodiments of the present invention, not all of them. Based on the spirit of the present invention, other embodiments obtained by ordinary technicians in this field without creative work are all within the scope of protection of the present invention.

[0059] like Figure 1 As shown, embodiment 1 of the present invention provides a method for formulating an operation and maintenance strategy for a capacitor voltage transformer in a substation, comprising the following steps:

[0060] Step 1: Collect capacitor voltage transformer data in the substation and construct a CVT population data set.

[0061] In a preferred but non-restrictive embodiment of the present invention, the voltage transformers with a topological relationship in the substation are taken as a group, and the secondary voltage data output by the group, the secondary load data of the electric energy meter, the station operation and maintenance team information and the CVT nameplate year information are collected to jointly constitute a CVT group data set, and the CVT group data set at a certain time t is used as the model training data.

[0062] Further preferably, the number of voltage transformer groups needs to meet the following requirements according to the operating conditions:

[0063] 1) For high voltage parallel operation, there shall be no less than 4 sets of voltage transformers; for low voltage parallel operation, there shall be no less than 4 sets of voltage transformers; 2) For parallel operation of the same voltage level, there shall be no less than 4 sets of voltage transformers, etc.

[0064] Step 2: Based on the CVT group data set in step 1, mathematical modeling is performed on the physical quantities related to the collaborative operation and maintenance targets, and a collaborative operation and maintenance target allocation model is constructed to generate multiple collaborative operation and maintenance target allocation plans within the same period.

[0065] In a preferred but non-limiting embodiment of the present invention, step 2 specifically comprises:

[0066] Step 2.1, mathematically model the physical quantities related to CVT and the operation and maintenance work group, and define the following symbols, C = {c 1 ,c 2 ,...,c n} represents the list of CVTs in the station, n is the total number of CVTs in the station;

[0067] P = {p 1 ,p 2 ,...,p m} represents the work group that can be used for operation and maintenance in the station, and m is the number of operation and maintenance work groups;

[0068] U'={u 1 ',u 2 ',...,u n '} represents the secondary voltage amplitude of each CVT;

[0069] Y={y 1 ,y 2 ,...y n} represents the service life of each transformer;

[0070] L = {l 1 ,l 2 ,...,l n} represents the secondary side load of each CVT measured by the secondary side energy meter;

[0071] S 1,t Represents the status of the operation and maintenance team at time t;

[0072] S 2,t represents the status of the CVT group in the station at time t;

[0073] Among them, the state of the operation and maintenance working group at time t and the state of the CVT group in the station at time t constitute the joint state 1,t ,S 2,t >.

[0074] x represents the collaborative target allocation strategy, Represents the optimal collaborative target allocation strategy.

[0075] Step 2.2, by assigning matrix B t represents a collaborative operation and maintenance target allocation scheme at the current time t, and the allocation matrix B t It is expressed as the following formula:

[0076]

[0077] Where:

[0078] b i,j is any element of the allocation matrix, representing p j The operation and maintenance team i CVT operation and maintenance action, that is, the c i The degree of reduction of CVT ratio difference, 0 i,j <1, b i,j is a continuous variable between 0 and 1, the size of which depends on the value of c i The degree of reduction of the CVT ratio difference before and after the operation and maintenance action is directly calculated from the ratio of the measured ratio difference data.

[0079] Step 2.3, construct a collaborative operation and maintenance target allocation model, generate multiple allocation matrices based on the operation and maintenance related physical quantities at the current time t, simulate each operation and maintenance working group to operate and maintain the CVT according to the operation and maintenance allocation plan and fixed action rules, and return the status and operation and maintenance results of each CVT after a single operation and maintenance.

[0080] Step 3: Establish a scoring model based on a neural network to score the multiple collaborative operation and maintenance target allocation plans in step 2. According to the multiple collaborative operation and maintenance target allocation plans and their scores, based on the collaborative operation and maintenance target allocation model in step 2, determine the optimal allocation plan for the collaborative operation and maintenance targets in each time period.

[0081] In a preferred embodiment of the present invention, step 3 specifically includes:

[0082] Step 3.1, use the objective function F 1 Measure the energy metering loss, set the optimization variable to the allocation matrix B, and set the optimization goal to ensure that the collaborative operation and maintenance tasks of all operation and maintenance teams can make F​​1 The value is minimized when F 1 The corresponding allocation matrix when it is minimum Represents the optimal allocation plan for collaborative operation and maintenance goals within this period, expressed as the following formula:

[0083]

[0084] Further preferably, the objective function F 1 It is expressed as the following formula:

[0085] F 1 =min[f 1 (B),f 2 (B),f 3 (B),f 4 (B)]

[0086]

[0087] Where:

[0088] g 1 The CVT service life loss is characterized by the ratio difference and the service life is mapped, which is obtained by manual setting or learning through statistical law analysis;

[0089] is the average amplitude of the group CVT secondary voltage,

[0090] f 1 It means that after the target allocation scheme corresponding to the allocation matrix B is operated and maintained, the smaller the difference, the better;

[0091] f 2 Indicates that the one with longer service life will be given priority for operation and maintenance;

[0092] f 3 The fewer the total number of working groups involved, the better;

[0093] f 4 Indicates that the secondary load with large size is given priority for operation and maintenance.

[0094] It is worth noting that the sub-objective function can be increased or decreased according to the actual operation and maintenance needs. 1 -f 4 Multiple sub-objective functions are taken as the overall objective function and the minimum value is taken. Compared with the traditional single objective function or multi-objective function optimization process, by setting multiple sub-objective functions, the impact of the collaborative operation and maintenance target allocation scheme can be comprehensively considered from multiple angles, which has more flexibility. At the same time, taking the minimum value as the overall objective function can avoid the possible goal conflicts and complex solution difficulties in multi-objective optimization.

[0095] Step 3.2, setting constraints, including the first constraint and the second constraint. Specifically,

[0096] The first constraint condition is that the correction of the deviation of the CVT service life caused by each operation and maintenance shall not exceed the deviation itself, which can be expressed as the following formula:

[0097]

[0098] The second constraint is that a working group can only operate and maintain one CVT at most, which can be expressed as follows:

[0099] For any 0≤j≤m,

[0100]

[0101] Step 3.3: Establish a scoring model based on the objective function of step 3.1 and the constraints of step 3.2. 1,t ,S 2,t >Score multiple collaborative operation and maintenance target allocation schemes, generate an evaluation matrix and input it into the collaborative operation and maintenance target allocation model in step 2 to optimize the target allocation scheme at the current moment.

[0102] In a preferred but non-limiting embodiment of the present invention, the scoring model is implemented by a learning algorithm. "Scoring" is regarded as an "action" of a virtual central agent responsible for top-level decision-making, and the "scoring model" is regarded as a "strategy" that needs to be learned. The basic steps of learning and optimizing the "scoring model" are as follows:

[0103] Step A.1, the neural network receives the spatial distribution status of the current operation and maintenance team and the CVT to be operated, calculates the scoring matrix through network forward propagation, and inputs it into the collaborative operation and maintenance target allocation model;

[0104] Step A.2: The collaborative operation and maintenance target allocation model is used as a centralized policy reasoning model. According to the scoring matrix, a collaborative operation and maintenance target allocation plan is formulated through policy reasoning, and the collaborative operation and maintenance target allocation plan is issued to each operation and maintenance team. Each operation and maintenance team performs the target CVT operation and maintenance task according to a fixed action strategy.

[0105] Step A.3: Evaluate the F generated by the network receiving the collaborative operation and maintenance target allocation scheme after single-step execution. 1 , the network parameters of the optimization scoring model are updated according to the deviation from the standard value;

[0106] Step A.4, iterate steps A.1 to A.3 until the set termination condition is met, the learning ends, and the scoring model is obtained.

[0107] ​Step 4: In the set time period, use the collaborative operation and maintenance target allocation model of step 2 with the scoring model of step 3 to splice the optimal allocation plan of each collaborative operation and maintenance target in the order of time periods to obtain the optimal collaborative target allocation strategy. T is the number of operation and maintenance in a set time period. Tasks are assigned to each operation and maintenance work group according to the optimal collaborative target allocation strategy, and each group performs the operation and maintenance of CVT in the substation according to the allocation strategy.

[0108] It can be understood that, through the method for formulating operation and maintenance strategy of capacitor voltage transformer of substation of the present invention, at the decision time t, the target allocation scheme is generated by the centralized strategy reasoning model of collaborative operation and maintenance target allocation model; within a period of time, combined with the scoring model based on neural network, according to the joint status of all operation and maintenance working groups and all CVTs, the target allocation scheme is generated by the centralized strategy reasoning model of collaborative operation and maintenance target allocation model. 1,t ,S 2,t > and objective function F1, to give the optimal station CVT operation and maintenance strategy at time t that can achieve the minimum power metering loss It can realize the cooperation of multiple staff groups within the station to complete the overall operation and maintenance tasks of the substation voltage transformer, and obtain the best effect with minimum energy metering loss and maximum operation and maintenance cost-effectiveness.

[0109] Embodiment 2 of the present invention provides a substation capacitor voltage transformer operation and maintenance system, which runs a substation capacitor voltage transformer operation and maintenance method described in embodiment 1, including:

[0110] The data acquisition module is used to collect data of capacitor voltage transformers in the substation and construct a group data set;

[0111] The strategy reasoning module is used to establish a collaborative operation and maintenance target allocation model and generate multiple collaborative operation and maintenance target allocation plans within the same period;

[0112] The strategy evaluation module is used to establish a scoring model to score multiple collaborative operation and maintenance target allocation schemes;

[0113] The optimal allocation module is used to determine the optimal allocation plan for the collaborative operation and maintenance targets in each time period, splice the optimal allocation plans for each collaborative operation and maintenance target in chronological order of the time periods, and output the substation capacitor voltage transformer operation and maintenance plan.

[0114] In an application example of the present invention, a computer system is used to simulate and execute the optimal operation and maintenance strategy. When simulating a certain operation and maintenance task, the initial joint state of the operation and maintenance working group and all CVTs is imported. 1,0 ,S 2,0 ​​>, according to the substation capacitor voltage transformer operation and maintenance method described in Example 1 of the present invention, an operation and maintenance target CVT allocation plan is generated, and each operation and maintenance working group adjusts the operation and maintenance object in real time according to the current plan. When the operation and maintenance task is completed, a "CVT operation and maintenance allocation plan sequence" that changes with time is obtained.

[0115] It can be understood that the operation and maintenance CVTs allocated to the working group in each CVT target allocation plan constitute the operation and maintenance CVT target sequence of the working group; whether the CVT is operated and maintained in each target allocation plan forms the operation and maintenance sequence between different working groups. The present invention considers the dual perspectives of time and space, and makes reasonable allocation of personnel arrangements, which not only reduces the workload of personnel and improves the operation and maintenance efficiency, but also can detect defective CVTs early and realize the standardized use of operation and maintenance management.

[0116] Compared with the prior art, the beneficial effects of the present invention include at least:

[0117] (1) Through the present invention, multiple staff groups in the station can cooperate to complete the overall operation and maintenance tasks of the substation voltage transformer within the same time range.

[0118] (2) Considering the time sequence, space, etc., reasonable allocation of personnel arrangements is carried out to achieve the best results with the maximum operation and maintenance cost-effectiveness.

[0119] (3) Ensure the safe and stable operation of the smart substation, which not only reduces the workload of personnel and improves the operation and maintenance efficiency, but also can detect defects early and realize the standardized operation and maintenance management.

[0120] The present disclosure may be a system, a method and / or a computer program product. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for causing a processor to implement various aspects of the present disclosure.

[0121] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A substation capacitor voltage transformer CVT operation and maintenance method, characterized in that: The following steps are involved: Collect capacitor voltage transformer data in substations to construct a population data set; According to the group data set, a collaborative operation and maintenance target allocation model is established to obtain multiple collaborative operation and maintenance target allocation schemes within the same period; Establish a scoring model to score multiple collaborative operation and maintenance target allocation schemes; According to multiple collaborative operation and maintenance target allocation plans and their scores, based on the collaborative operation and maintenance target allocation model, the optimal collaborative operation and maintenance target allocation plan in each time period is determined; The optimal allocation plan for each collaborative operation and maintenance target is spliced ​​in chronological order to obtain the operation and maintenance plan for the capacitor voltage transformer of the substation.

2. The method for formulating operation and maintenance strategy for capacitor voltage transformer in substation according to claim 1, characterized in that: The voltage transformers with topological relationships in the substation are taken as a group. The secondary voltage data output by the group, the secondary load data of the electric energy meter, the information of the operation and maintenance team in the station and the year information of the CVT nameplate are collected to form the CVT group data set.

3. The method for formulating operation and maintenance strategy for capacitor voltage transformer in substation according to claim 2, characterized in that: The number of voltage transformer groups shall not be less than 4.

4. The method for formulating operation and maintenance strategy for capacitor voltage transformer in substation according to claim 1, characterized in that: In the step of establishing the collaborative operation and maintenance target allocation model, the physical quantities related to CVT and the operation and maintenance working group are modeled as follows: C={c1,c2,...,c n } represents the list of CVTs in the station, n is the total number of CVTs in the station; P={p1,p2,...,p m } represents the work group that can be used for operation and maintenance in the station, and m is the number of operation and maintenance work groups; U'={u1',u2',...,u n '} represents the secondary voltage amplitude of each CVT; Y={y1,y2,...y n } represents the service life of each transformer; L={l1,l2,...,l n } represents the secondary side load of each CVT measured by the secondary side energy meter; S 1,t Represents the status of the operation and maintenance team at time t; S 2,t represents the status of the CVT group in the station at time t; Among them, the state of the operation and maintenance working group at time t and the state of the CVT group in the station at time t constitute the joint state 1,t ,S 2,t >.​ 5. The method for formulating operation and maintenance strategy for capacitor voltage transformer in substation according to claim 4, characterized in that: By assigning the matrix B t It represents the collaborative operation and maintenance target allocation scheme at the current time t, and the allocation matrix B t It is expressed as the following formula: Where: b i,j is any element of the allocation matrix, representing p j The operation and maintenance team i The degree of reduction of the ratio difference after CVT operation and maintenance, 0 i,j <1, b i,j It is a continuous variable, which is directly calculated from the ratio of the difference data before and after the operation and maintenance action.​ 6. The method for formulating operation and maintenance strategy for capacitor voltage transformer in substation according to claim 5, characterized in that: The steps for determining the optimal allocation plan for collaborative operation and maintenance objectives in each time period specifically include: Taking the minimum loss of electric energy metering as the objective function, the collaborative operation and maintenance target allocation model is solved according to the objective function and constraints to obtain multiple collaborative operation and maintenance target allocation schemes at the same time; Establish a scoring model based on the joint status 1,t ,S 2,t >Score multiple collaborative operation and maintenance target allocation plans, generate an evaluation matrix and input it into the collaborative operation and maintenance target allocation model to optimize the target allocation plan at the current moment.​ 7. The method for formulating operation and maintenance strategy for capacitor voltage transformer in substation according to claim 6, characterized in that: The objective function F1 is expressed as follows: F1=min[f1(B),f2(B),f3(B),f4(B)] Where: g1 is the mapping between the CVT service life loss in the ratio difference and the service life, which is set manually or obtained by learning; is the average amplitude of the group CVT secondary voltage, 8. The method for formulating operation and maintenance strategy for capacitor voltage transformer in substation according to claim 6, characterized in that: The constraint conditions include a first constraint condition and a second constraint condition; The first constraint is that the correction of the deviation of CVT service life caused by each operation and maintenance shall not exceed the deviation itself, which can be expressed as follows: The second constraint is that a work group can only operate and maintain one CVT at most, which can be expressed as follows: For any 0≤j≤m, 9. The method for formulating operation and maintenance strategy for capacitor voltage transformer in substation according to claim 1, characterized in that: The scoring model is constructed based on a neural network and is obtained through learning optimization, specifically including the following steps: Step A.1, the neural network inputs the joint status of the operation and maintenance working group and CVT, calculates the scoring matrix through network forward propagation, and inputs it into the collaborative operation and maintenance target allocation model; Step A.2: The collaborative operation and maintenance target allocation model formulates a collaborative operation and maintenance target allocation plan based on the scoring matrix through strategic reasoning, and issues the collaborative operation and maintenance target allocation plan to each operation and maintenance team. Each operation and maintenance team performs the target CVT operation and maintenance task according to a fixed action strategy. Step A.3, evaluate the objective function F1 value generated after the single-step execution of the network reception collaborative operation and maintenance target allocation scheme, and update the network parameters of the optimization scoring model according to the deviation from the standard value; Step A.4, iterate steps A.1 to A.3 until the set termination condition is met, the learning ends, and the scoring model is obtained.

10. A substation capacitor voltage transformer operation and maintenance system, which runs the substation capacitor voltage transformer operation and maintenance method according to any one of claims 1 to 9, characterized in that: include: The data acquisition module is used to collect data of capacitor voltage transformers in the substation and construct a group data set; The strategy reasoning module is used to establish a collaborative operation and maintenance target allocation model and generate multiple collaborative operation and maintenance target allocation plans within the same period; The strategy evaluation module is used to establish a scoring model to score multiple collaborative operation and maintenance target allocation schemes; The optimal allocation module is used to determine the optimal allocation plan for the collaborative operation and maintenance targets in each time period, splice the optimal allocation plans for each collaborative operation and maintenance target in chronological order of the time periods, and output the substation capacitor voltage transformer operation and maintenance plan.

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