Distribution network grid structure problem identification method, device, equipment and storage medium

Abstract

The present invention discloses a method, device, equipment and storage medium for identifying grid structure problems of a distribution network. A method for identifying grid structure problems of a distribution network comprises: obtaining equipment information of a distribution network to be identified; matching a corresponding model from a preset power system public data model library based on the equipment information to construct an initial distribution model; initializing the initial model with power on to obtain a grid model; analyzing the grid model to determine whether there is a grid structure problem in the grid model. The distribution network to be identified is converted into a virtual model, and then the grid structure problem analysis of the grid model is automatically performed to determine whether there is a grid structure problem in the distribution network to be identified, thereby reducing the dependence on human resources, thereby effectively improving the efficiency of identifying grid structure problems in the distribution network.

Description

Technical Field

[0001] The embodiments of the present invention relate to a distribution network problem identification technology, and more particularly to a distribution network grid structure problem identification method, device, equipment and storage medium. Background Art

[0002] Distribution network planning is to determine the optimal system construction plan based on the results of load forecasting during the planning period and the basic conditions of the existing network, so as to minimize the construction and operation costs of the distribution network while meeting the load growth and safe and reliable supply of electricity.

[0003] In the process of distribution network planning, it is necessary to identify the problems of the distribution network in order to determine the existing problems of the current distribution network and provide a reference for the distribution network planning. At present, most of the problems of domestic distribution network planning rely on the experience of planners to make judgments, and rely on manual comparison of various problems of the distribution network to determine the standards of the existing distribution network. Manual modeling and analysis are required, which is inefficient. Summary of the invention

[0004] The present invention provides a method, device, equipment and storage medium for identifying distribution network grid structure problems, so as to effectively improve the efficiency of identifying distribution network grid structure problems.

[0005] In a first aspect, an embodiment of the present invention provides a method for identifying a distribution network structure problem, comprising:

[0006] Obtaining equipment information of the distribution network to be identified;

[0007] Based on the device information, a corresponding model is matched from a preset power system public data model library to build an initial model;

[0008] Initializing the initial model in a powered state to obtain a power grid model;

[0009] The power grid model is analyzed to determine whether there is a grid structure problem in the power grid model.

[0010] Optional, including:

[0011] Obtain the grid version ID, partition ID list, substation ID list, and line ID list of the distribution network to be identified.

[0012] Optionally, matching a corresponding model from a preset power system public data model library based on the device information to build an initial model includes:

[0013] Matching the corresponding power system public data model library based on the device information;

[0014] Matching corresponding models of interconnection lines and substation equipment from the power system public data model library;

[0015] An initial model is constructed based on the model matching the topological relationship between the models.

[0016] Optionally, the initializing the initial model in a powered state to obtain a power grid model includes:

[0017] Starting from the power generation equipment of the initial model, the energized state of the initial model is set according to the line connection information, and the energized state initialization of the initial model is completed.

[0018] Optionally, analyzing the power grid model to determine whether the power grid model has a grid structure problem includes:

[0019] Performing topological analysis on the power grid model to determine whether there is a topological problem;

[0020] A branch analysis is performed on the power grid model to determine whether there is a large branch problem.

[0021] Optionally, performing topological analysis on the power grid model to determine whether there is a topological problem includes:

[0022] Determine whether the power grid model has a ring network problem;

[0023] Determining whether the power grid model lacks an outlet switch;

[0024] It is determined whether there are energized feeders at both ends of the tie switch of the power grid model.

[0025] Optionally, performing branch analysis on the power grid model to determine whether there is a large branch problem includes:

[0026] Determining a branch path of a trunk line based on the power grid model;

[0027] Determine the number of distribution transformers and the number of users of each branch path;

[0028] Whether there is a large branch problem is determined based on the number of distribution transformers and the number of users.

[0029] In a second aspect, an embodiment of the present invention further provides a device for identifying a distribution network structure problem, comprising:

[0030] An acquisition module, used to acquire device information of the distribution network to be identified;

[0031] A construction module, used to match a corresponding model from a preset power system public data model library based on the device information to build an initial model;

[0032] An initialization module, used to initialize the initial model in a powered state to obtain a power grid model;

[0033] The judgment module is used to analyze the power grid model to determine whether there is a grid structure problem in the power grid model.

[0034] In a third aspect, an embodiment of the present invention further provides a device for identifying problems in a distribution network structure, the device comprising:

[0035] one or more processors;

[0036] A storage device for storing one or more programs;

[0037] When the one or more programs are executed by the one or more processors, the one or more processors implement the distribution network grid structure problem identification method as described in the first aspect.

[0038] In a fourth aspect, an embodiment of the present invention further provides a storage medium comprising computer executable instructions, which, when executed by a computer processor, are used to execute the method for identifying distribution network grid structure problems as described in the first aspect.

[0039] The present invention establishes an initial model by matching the distribution network to be identified with the public data model library of the power system, and then obtains the power grid model by initializing the initial model with a live state based on the actual working state of the distribution network to be identified. The distribution network to be identified can be effectively converted into a virtual model, and then the grid structure problem of the grid model can be automatically analyzed to determine whether the distribution network to be identified has a grid structure problem, thereby reducing the dependence on human resources, thereby effectively improving the efficiency of identifying the grid structure problem of the distribution network. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 Flow chart of the method for identifying distribution network structure problems provided in the first embodiment of the present invention

[0041] Figure 2 A structural diagram of a distribution network grid structure problem identification device provided in Embodiment 2 of the present invention;

[0042] Figure 3 This is a structural diagram of a distribution network grid structure problem identification device provided in Example 3 of the present invention. DETAILED DESCRIPTION

[0043] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0044] Embodiment 1

[0045] Figure 1 This is a flow chart of a method for identifying a grid structure problem of a distribution network provided in Embodiment 1 of the present invention. This embodiment is applicable to the case of identifying a grid structure problem of a distribution network. The method can be executed by a distribution network grid structure problem identification device. The distribution network grid structure problem identification device can be implemented by software and / or hardware and can be configured in a computer device, such as a server, a workstation, a personal computer, etc. The method specifically includes the following steps:

[0046] Step 110: Obtain equipment information of the distribution network to be identified.

[0047] The distribution network refers to the power grid that receives electric energy from the transmission network or regional power plants and distributes it locally or step by step according to voltage to various users through distribution facilities. It is composed of overhead lines, cables, towers, distribution transformers, disconnectors, reactive power compensators and some ancillary facilities, and plays an important role in distributing electric energy in the power grid.

[0048] In an embodiment of the present invention, the identified equipment information of the distribution network may include equipment information of each device in the distribution network, such as equipment information of overhead lines, distribution transformers, disconnectors, feeders, outlet switches, tie switches and other equipment.

[0049] In addition, the specific presentation form of the device information can be saved in the form of a database. To obtain the device information of the distribution network to be identified, it is only necessary to obtain the power grid version ID, partition ID list, substation ID list and line ID list corresponding to the device to determine the device information of the corresponding device. That is to say, in an embodiment of the present invention, the device information obtained in this step can be the device ID of each device, and then the final device information matching is performed through the power grid version ID, partition ID list, substation ID list and line ID list of the distribution network.

[0050] Step 120: Based on the equipment information, a corresponding model is matched from a preset power system public data model library to construct an initial model.

[0051] The Common Information Model (CIM) of the power system is an abstract model used to describe all major objects of power enterprises, especially those related to power operation. By providing a standard method for representing power system resources using object classes and attributes and the relationships between them, CIM facilitates the integration of energy management system (EMS) applications independently developed by different vendors, the integration between multiple independently developed complete EMS systems, and the integration between EMS systems and other systems involved in different aspects of power system operation, such as power generation or distribution systems. This is achieved by defining a common language (i.e., syntax and semantics) based on CIM, which enables these applications or systems to access common data and exchange information without relying on the internal representation of information.

[0052] In the embodiment of the present invention, the corresponding objects of the distribution network to be identified are matched from the power system public data model library based on the device information obtained in the above steps to form a new initial model. In other words, the CIM is simplified to obtain an initial model corresponding to the distribution network to be identified and constructed according to the CIM standard.

[0053] Step 130: Initialize the initial model in a powered state to obtain a power grid model.

[0054] In the specific implementation, the operating status and initial status of each device in the distribution network are not the same. Therefore, it is necessary to set the state of the initial model based on the specific situation of the distribution network to be identified, so that the operating status of each device in the initial model is consistent with the actual situation of the distribution network to be identified, so as to avoid errors or mistakes caused by differences in the status of the equipment when performing analysis and judgment.

[0055] Step 140: Analyze the power grid model to determine whether there is a grid structure problem in the power grid model.

[0056] In the embodiment of the present invention, a power grid model consistent with the distribution network to be identified is established in the aforementioned steps, and in this step, an analysis is performed based on the power grid model to determine the grid structure problems existing in the distribution network to be identified. For example, the main and branch paths of the power grid model are analyzed, and then it is determined whether there are ring network problems and large branch problems.

[0057] The technical solution of this embodiment is to establish an initial model by matching the distribution network to be identified with the public data model library of the power system, and then to obtain a power grid model by initializing the initial model with power on based on the actual working state of the distribution network to be identified. The distribution network to be identified can be effectively converted into a virtual model, and then the grid structure problem analysis of the grid model can be automatically performed to determine whether the distribution network to be identified has a grid structure problem, thereby reducing dependence on human resources and effectively improving the efficiency of identifying the grid structure problem of the distribution network.

[0058] Based on the above technical solution, the device information acquired in step 110 may be the grid version ID, partition ID list, substation ID list and line ID list of the distribution network to be identified.

[0059] Step 120 may include:

[0060] Step 121: Match the corresponding power system public data model library based on the equipment information.

[0061] In the embodiment of the present invention, the power system public data model library may have different settings for different power grid versions; or, the models in the power system public data model library may have different settings for different power grid version IDs, or the same model may have different details for different power grid version IDs. In this step, the corresponding power system public data model library needs to be matched based on the power grid version ID in the device information.

[0062] Step 122: Match the corresponding interconnection line and substation equipment models from the power system public data model library.

[0063] In an embodiment of the present invention, the initial model can be optionally constructed using interconnection line and substation equipment models. In this step, the interconnection line and substation equipment models corresponding to the distribution network are matched and confirmed using the partition ID list, substation ID list and line ID list in the equipment information from the power system public data model library matched in the aforementioned step 121.

[0064] Step 123: construct an initial model based on the topological relationship between the model matching models.

[0065] In a specific implementation, the models of the matching interconnection lines and substation equipment may be separately saved in the format of the public data model library of the power system to obtain the required initial model.

[0066] In a specific implementation, it may also include: simplifying the initial model, for example, merging and simplifying the busbar sections of the tie line in the initial model and adjusting the line segment ID (juncID) connected to the busbar section.

[0067] Step 130 includes:

[0068] Starting from the power generation equipment of the initial model, the live state of the initial model is set according to the line connection information, and the live state initialization of the initial model is completed.

[0069] In a specific implementation, the energized states of all devices in the initial model can be initialized first, and the energized states of all existing devices can be reset to a non-energized state. Then, starting from the generator, the energized states of the devices connected to the generator can be changed in sequence based on the energized state of the generator, until the energized states of all devices are set, so that the energized states of the devices in the initial model are consistent with the actual energized states. This can also include setting the on / off states of each switch.

[0070] In step 140, it may include

[0071] Step 141: Perform a topological analysis on the power grid model to determine whether there is a topological problem;

[0072] Step 142: Perform branch analysis on the power grid model to determine whether there is a large branch problem.

[0073] In the embodiment of the present invention, the grid structure problem, topology problem and large branch problem of the distribution network are mainly targeted. In other embodiments, it can also be a trunk line problem, an automated section switch problem, an inter-station contact rate problem, an intra-station contact rate problem, a same busbar contact rate problem, a same-pole line contact problem, a head-end contact problem, a contact point rationality problem, a non-transfer problem and a wiring mode problem. For other problems, when constructing a power grid model, select and match the corresponding model to construct the power grid model.

[0074] Step 141 may include:

[0075] Step 1411: Determine whether there is a ring network problem in the power grid model.

[0076] Simply put, a ring network is a closed-loop network that connects power generation equipment and loads. It refers to a method of supplying power by connecting two or more feedback lines in different substations or different buses in the same substation into a loop. However, the operation of a ring network during the normal operation of the distribution network is likely to cause damage to the thermal stability of the system, damage to the dynamic stability of the system, and is not conducive to economic operation. Therefore, it is necessary to judge the ring network situation, avoid ring network operation, or have a controlled ring network operation.

[0077] Step 1412: Determine whether the power grid model lacks an outlet switch.

[0078] The outlet switch mainly refers to the generator outlet switch. The outlet switch can quickly cut off the fault when an asymmetric short circuit occurs at the generator outlet or an unbalanced load is applied to prevent the generator from being damaged. The installation of the outlet switch can facilitate the plant power switching operation and improve its power supply reliability. If the generator outlet is not equipped with an outlet switch, it is inevitable to perform parallel switching between the high-voltage plant working transformer and the starting standby transformer power supply during the normal start and stop process of the unit. In this step, the main purpose is to detect whether the generator outlet is equipped with an outlet switch.

[0079] Step 1413: Determine whether there are energized feeders at both ends of the tie switch of the power grid model.

[0080] The tie switch is used to transfer the load of the failed power supply to another power supply when one power supply fails during dual power supply operation, thereby improving power supply reliability.

[0081] Step 142 includes:

[0082] Step 1421: Determine the branch path of the trunk line based on the power grid model.

[0083] In the specific implementation, first find all the tie switches of each line segment in the power grid model to determine the path of its trunk line. Trunk identification starts from the outlet switch of each feeder (must be energized), terminates when encountering a tie switch, records the path device information, sets the branch identifier of the device as the trunk, and records the tie information. It terminates when encountering a loop device in the middle. We assume that the T-connected line segments (overhead lines, cables, switch-type equipment) on the trunk path are all used as the starting point of the branch line. Each branch line branched from the trunk line will form a tree structure, thereby obtaining each branch path.

[0084] Step 1422: Determine the number of distribution transformers and the number of users on each branch path.

[0085] In the specific implementation, the topology search is continued from the starting point of each branch line downward, and all distribution transformers, overhead lines, and cables on each branch line are recorded in sequence.

[0086] Step 1423: Determine whether there is a large branch problem based on the number of distribution transformers and the number of users.

[0087] In the specific implementation, the judgment rule for a large branch is that if the number of medium-voltage distribution transformers in each branch is greater than the parameter setting value or the number of low-voltage users is greater than the setting value, the branch is judged to be a large branch; if at least one branch of the entire line is a large branch, the entire line is judged to be a large branch.

[0088] Embodiment 2

[0089] Figure 2This is a structural diagram of a device for identifying distribution network structure problems provided in the second embodiment of the present invention. The device includes: an acquisition module 21, a construction module 22, an initialization module 23 and a judgment module 24. Among them:

[0090] An acquisition module 21 is used to acquire device information of the distribution network to be identified;

[0091] A construction module 22, configured to match a corresponding model from a preset power system public data model library based on the device information to construct an initial model;

[0092] An initialization module 23 is used to initialize the initial model in a powered state to obtain a power grid model;

[0093] The judgment module 24 is used to analyze the power grid model to determine whether there is a grid structure problem in the power grid model.

[0094] The acquisition module 21 includes:

[0095] Obtain the grid version ID, partition ID list, substation ID list, and line ID list of the distribution network to be identified.

[0096] Building block 22 includes:

[0097] A first matching unit, configured to match a corresponding power system public data model library based on device information;

[0098] A second matching unit is used to match the corresponding models of the interconnection line and the substation equipment from the power system public data model library;

[0099] The construction unit is used to construct an initial model based on the topological relationship between model matching models.

[0100] The initialization module 23 includes:

[0101] The initialization unit is used to set the live state of the initial model according to the line connection information starting from the power generation equipment of the initial model, and complete the initialization of the live state of the initial model.

[0102] The judging module 24 includes:

[0103] The topology unit is used to perform topological analysis on the power grid model to determine whether there are topological problems;

[0104] The large branch unit is used to perform branch analysis on the power grid model to determine whether there is a large branch problem.

[0105] The topology unit includes:

[0106] The ring network subunit is used to determine whether there is a ring network problem in the power grid model;

[0107] An outlet switch subunit, used to determine whether the power grid model lacks an outlet switch;

[0108] The feeder subunit is used to determine whether there are energized feeders at both ends of the tie switch of the power grid model.

[0109] The large branch units include:

[0110] A path subunit, used for determining a branch path of a trunk line based on a power grid model;

[0111] The statistical subunit is used to determine the number of distribution transformers and users on each branch path;

[0112] The judgment subunit is used to judge whether there is a large branch problem based on the number of distribution transformers and the number of users.

[0113] The distribution network grid structure problem identification device provided in the embodiment of the present invention can execute the distribution network grid structure problem identification method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0114] Embodiment 3

[0115] Figure 3 This is a schematic diagram of a device for identifying distribution network structure problems provided by the fourth embodiment of the present invention. Figure 3 As shown, the electronic device includes a processor 30, a memory 31, a communication module 32, an input device 33 and an output device 34; the number of processors 30 in the electronic device can be one or more. Figure 3 A processor 30 is taken as an example; the processor 30, the memory 31, the communication module 32, the input device 33 and the output device 34 in the electronic device can be connected by a bus or other means. Figure 3 The example of connecting through bus is taken in the following.

[0116] The memory 31, as a computer-readable storage medium, can be used to store software programs, computer executable programs and modules, such as the modules corresponding to the distribution network grid structure problem identification method in this embodiment (for example, the acquisition module 21, the construction module 22, the initialization module 23 and the judgment module 24 in a distribution network grid structure problem identification device). The processor 30 executes various functional applications and data processing of the electronic device by running the software programs, instructions and modules stored in the memory 31, that is, realizing the above-mentioned distribution network grid structure problem identification method.

[0117] The memory 31 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system and at least one application required for a function; the data storage area may store data created according to the use of the electronic device, etc. In addition, the memory 31 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some instances, the memory 31 may further include a memory remotely arranged relative to the processor 30, and these remote memories may be connected to the electronic device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0118] The communication module 32 is used to establish a connection with the display screen and implement data interaction with the display screen. The input device 33 can be used to receive input digital or character information and generate key signal input related to user settings and function control of the electronic device.

[0119] The present embodiment provides a distribution network grid structure problem identification device, which can execute the distribution network grid structure problem identification method provided by any embodiment of the present invention, and has specific corresponding functions and beneficial effects.

[0120] Embodiment 4

[0121] Embodiment 4 of the present invention further provides a storage medium comprising computer executable instructions, wherein the computer executable instructions are used to execute a method for identifying a distribution network grid structure problem when executed by a computer processor, the method comprising:

[0122] Obtaining equipment information of the distribution network to be identified;

[0123] Based on the equipment information, the corresponding model is matched from the preset power system public data model library to build an initial model;

[0124] Initialize the initial model in a powered state to obtain a power grid model;

[0125] Analyze the power grid model to determine whether there are any grid structure problems in the power grid model.

[0126] Of course, the storage medium containing computer executable instructions provided in an embodiment of the present invention, whose computer executable instructions are not limited to the method operations described above, can also execute related operations in a distribution network grid structure problem identification method provided in any embodiment of the present invention.

[0127] Through the above description of the implementation methods, the technicians in the relevant field can clearly understand that the present invention can be implemented by means of software and necessary general hardware, and of course it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ROM), random access memory (RAM), flash memory (FLASH), hard disk or optical disk, etc., including a number of instructions for a computer electronic device (which can be a personal computer, a server, or a network electronic device, etc.) to execute the methods described in each embodiment of the present invention.

[0128] It is worth noting that in the above-mentioned embodiment of the distribution network grid structure problem identification device, the various units and modules included are only divided according to functional logic, but are not limited to the above-mentioned division, as long as the corresponding functions can be achieved; in addition, the specific names of the functional units are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of the present invention.

[0129] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A method for identifying distribution network structure problems, characterized in that: include: Obtaining equipment information of the distribution network to be identified; Based on the device information, a corresponding model is matched from a preset power system public data model library to build an initial model; Initializing the initial model in a powered state to obtain a power grid model; Analyze the power grid model to determine whether there is a grid structure problem in the power grid model; The analyzing the power grid model to determine whether the power grid model has a grid structure problem includes: Performing topological analysis on the power grid model to determine whether there is a topological problem; Performing branch analysis on the power grid model to determine whether there is a large branch problem; The performing of topological analysis on the power grid model to determine whether there is a topological problem includes: Determine whether the power grid model has a ring network problem; Determining whether the power grid model lacks an outlet switch; Determining whether there are energized feeders at both ends of the tie switch of the power grid model; The performing branch analysis on the power grid model to determine whether there is a large branch problem includes: Determining a branch path of a trunk line based on the power grid model; Determine the number of distribution transformers and the number of users of each branch path; Whether there is a large branch problem is determined based on the number of distribution transformers and the number of users.

2. The method for identifying distribution network structure problems according to claim 1, characterized in that: The obtaining of the device information of the distribution network to be identified includes: Obtain the grid version ID, partition ID list, substation ID list, and line ID list of the distribution network to be identified.

3. The method for identifying distribution network structure problems according to claim 1, characterized in that: The matching of the corresponding model from a preset power system public data model library based on the device information to build an initial model includes: Matching the corresponding power system public data model library based on the device information; Matching corresponding models of interconnection lines and substation equipment from the power system public data model library; An initial model is constructed based on the model matching the topological relationship between the models.

4. The method for identifying distribution network structure problems according to claim 1, characterized in that: The step of initializing the initial model in a powered state to obtain a power grid model includes: Starting from the power generation equipment of the initial model, the energized state of the initial model is set according to the line connection information, and the energized state initialization of the initial model is completed.

5. A distribution network grid structure problem identification device, characterized in that: include: An acquisition module, used to acquire device information of the distribution network to be identified; A construction module, used to match a corresponding model from a preset power system public data model library based on the device information to build an initial model; An initialization module, used to initialize the initial model in a powered state to obtain a power grid model; A judgment module is used to analyze the power grid model to determine whether there is a grid structure problem in the power grid model; Wherein, the judgment module includes: A topology unit, used to perform topology analysis on the power grid model to determine whether there is a topology problem; A large branch unit, used to perform branch analysis on the power grid model to determine whether there is a large branch problem; Wherein, the topology unit includes: A ring network subunit, used to determine whether there is a ring network problem in the power grid model; An outlet switch subunit, used for determining whether the power grid model lacks an outlet switch; A feeder subunit, used to determine whether there are energized feeders at both ends of the tie switch of the power grid model; Wherein, the large branch unit comprises: A path subunit, used to determine a branch path of a trunk line based on the power grid model; A statistical subunit, used to determine the number of distribution transformers and the number of users of each branch path; The judging subunit is used to judge whether there is a large branch problem based on the number of distribution transformers and the number of users.

6. A distribution network grid structure problem identification device, characterized in that: The device comprises: one or more processors; A storage device for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the distribution network grid structure problem identification method as described in any one of claims 1-4.

7. A storage medium containing computer executable instructions, characterized in that: The computer executable instructions are used to execute the distribution network grid structure problem identification method as described in any one of claims 1-4 when executed by a computer processor.

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