A fault scanning method and system based on a power grid simulation data management platform

Abstract

This invention discloses a fault scanning method and system based on a power grid simulation data management platform, belonging to the field of power system simulation and stability analysis technology. The method includes: establishing a data management library according to the data types and operation and maintenance characteristics of the power grid; retrieving data from the data management library based on the basic fault model and stability calculation requirements of the power grid, and establishing a fault description table structure for the data; retrieving operating modes and planning schemes from the data management library based on the fault description table structure, determining whether the operating modes and planning schemes are in operation and marking them, determining whether power grid equipment faults are valid and marking them, and performing fault screening on the marked operating modes, planning schemes, and power grid equipment faults; mapping the screened faults to a simulation fault scanning model, and using the fault scanning model to perform fault scanning on the power grid. This invention ensures that each generated fault is realistic and valid under the studied power grid operating mode.

Description

Technical Field

[0001] This invention relates to the field of power system simulation and stability analysis technology, and more specifically, to a fault scanning method and system based on a power grid simulation data management platform. Background Technology

[0002] With the continuous construction and development of power grids and the increasing complexity of the system, the issue of safe and stable operation has become a crucial aspect of power system operation. Transient stability is the most important aspect of stability analysis. Therefore, it is necessary to take effective control measures to improve the stable operation level of the power grid. Preventive control is an effective means to ensure the safety of the power system and prevent large-scale disasters. By adjusting the control variables of the system and rationally arranging the operation mode of the power grid, the transient stability level of the system can be effectively improved.

[0003] For power grid simulation analysts, determining whether a power grid's operating mode is reasonable, robust, and stable often involves simulating equipment faults and performing stability calculations, also known as N-1 and N-2 fault scans. This involves setting up faults such as three-phase short circuits on one circuit of each multi-circuit line in the power grid to study and analyze the transient stability pre-control of the power grid. For traditional N-1 scans, two simulation calculation programs, BPA or PSASP, are generally used. This requires maintaining two sets of stability scan files. In order to ensure that each fault is effective under its operating mode, a stability scan fault must be defined for each mode, or the faults of non-operational equipment must be manually deactivated. This is a huge workload and prone to errors.

[0004] For stability analysis of large power grids, a hierarchical and zoning principle is generally adopted. Based on voltage level and the region where the equipment is located, the large grid is divided into smaller grids, and stability calculations and analyses are performed on each smaller grid. Then, the smaller grids are spliced ​​together to continue the full-network stability scan analysis. A single stability fault scan file is difficult to meet the stability calculation requirements of the full-network approach. Summary of the Invention

[0005] To address the above problems, this invention provides a fault scanning method based on a power grid simulation data management platform, comprising:

[0006] Establish a data management database based on the types of power grid data and the characteristics of its operation and maintenance;

[0007] Based on the basic fault model of the power grid and the requirements for stability calculation, data is retrieved from the data management library, and a fault description table structure is established for the data.

[0008] Based on the fault description table structure, the data management library is called to obtain the operating mode and planning scheme, and it is determined whether the operating mode and planning scheme are put into operation and marked. The validity of the power grid equipment fault is determined and marked. Fault screening is performed on the marked operating mode, planning scheme and power grid equipment fault.

[0009] The selected faults are mapped to a simulated fault scanning model, and the fault scanning model is used to perform fault scanning on the power grid.

[0010] Optional, the data management library includes: equipment parameter management library, operation mode management library, and planning scheme management library.

[0011] Optionally, the selected faults can be mapped to a simulation fault scanning model, including: device primary key mapping association and fault model mapping and device parameter mapping.

[0012] Optional, the data fault description table structure includes: a neutral description of the fault, a simplified GUI, and a table structure.

[0013] This invention also proposes a fault scanning system based on a power grid simulation data management platform, comprising:

[0014] The management database establishment unit establishes a data management database based on the types of power grid data and the characteristics of its operation and maintenance.

[0015] The table structure creation unit, based on the basic fault model of the power grid and the stability calculation requirements, calls the data obtained from the data management library to create a fault description table structure for the data.

[0016] The fault screening unit, based on the fault description table structure, calls the data management library to obtain the operating mode and planning scheme, determines whether the operating mode and planning scheme are in operation and marks them, determines whether the power grid equipment faults are valid and marks them, and performs fault screening on the marked operating modes, planning schemes and power grid equipment faults;

[0017] The scanning unit maps the selected faults to a simulated fault scanning model, and uses the fault scanning model to perform fault scanning on the power grid.

[0018] Optional, the data management library includes: equipment parameter management library, operation mode management library, and planning scheme management library.

[0019] Optionally, the selected faults can be mapped to a simulation fault scanning model, including: device primary key mapping association and fault model mapping and device parameter mapping.

[0020] Optional, the data fault description table structure includes: a neutral description of the fault, a simplified GUI, and a table structure.

[0021] This invention ensures that each generated fault is real and valid under the research power grid operation mode. Attached Figure Description

[0022] Figure 1 This is a flowchart of the method of the present invention;

[0023] Figure 2 This is a diagram of the fault set table structure in an embodiment of the present invention;

[0024] Figure 3 This is a flowchart of the stable calculation scanning procedure in an embodiment of the present invention;

[0025] Figure 4 This is a mapping diagram from the power grid parameter model to the calculation model in an embodiment of the present invention;

[0026] Figure 5 This is a flowchart illustrating the process of deriving the fault set in an embodiment of the present invention;

[0027] Figure 6 This is a structural diagram of the system of the present invention. Detailed Implementation

[0028] Exemplary embodiments of the invention will now be described with reference to the accompanying drawings. However, the invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to fully and completely disclose the invention and to fully convey its scope to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the drawings is not intended to limit the invention. In the drawings, the same units / elements are referred to by the same reference numerals.

[0029] Unless otherwise stated, the terms used herein (including technical terms) have their common meaning as understood by one of ordinary skill in the art. Furthermore, it is understood that terms defined in commonly used dictionaries should be understood to have a meaning consistent with the context of their relevant field, and not to be interpreted as having an idealized or overly formal meaning.

[0030] This invention provides a fault scanning method based on a power grid simulation data management platform, such as... Figure 1 As shown, it includes:

[0031] Establish a data management database based on the types of power grid data and the characteristics of its operation and maintenance;

[0032] Based on the basic fault model of the power grid and the requirements for stability calculation, data is retrieved from the data management library, and a fault description table structure is established for the data.

[0033] Based on the fault description table structure, the data management library is called to obtain the operating mode and planning scheme, and it is determined whether the operating mode and planning scheme are put into operation and marked. The validity of the power grid equipment fault is determined and marked. Fault screening is performed on the marked operating mode, planning scheme and power grid equipment fault.

[0034] The selected faults are mapped to a simulated fault scanning model, and the fault scanning model is used to perform fault scanning on the power grid.

[0035] The data management library includes: equipment parameter management library, operation mode management library, and planning scheme management library.

[0036] The selected faults are mapped to the simulation fault scanning model, including: device primary key mapping association and fault model mapping and device parameter mapping.

[0037] The fault description table structure includes: a neutral description of the fault, a simplified GUI, and a table structure.

[0038] The present invention will be further described below with reference to embodiments:

[0039] The method of the present invention includes:

[0040] Power grid design based on time-series rolling planning:

[0041] The PSDB system is a parameter management system and status control platform for the entire lifecycle of power transmission and transformation equipment. It adopts a hierarchical design approach for power grid equipment models and operating mode parameters, using a lossless decomposition method and the principle of eliminating low-level redundancy to construct power grid equipment data model objects and operating mode data model objects. This hierarchical data structure design ensures both the uniqueness of equipment model parameters and the flexibility of operating mode data, making it suitable for power grid simulation calculation data management.

[0042] Based on the types of power grid data and their operation and maintenance characteristics, it is divided into three parts:

[0043] Equipment parameter management library;

[0044] It provides simulation and analysis personnel with functions such as power transmission network equipment and parameter maintenance, basic information query, parameter version management, incremental information extraction, equipment parameter inspection and verification, and viewing statistical reports.

[0045] Runtime Management Library;

[0046] The design and operation mode management module mainly provides operation mode data for simulation calculation and analysis personnel, forms simulation calculation and analysis data, integrates calculation programs for power flow, short-circuit current and transient stability, and realizes networked online calculation functions.

[0047] Planning scheme library;

[0048] In addition to the time dimension of the running equipment library, a spatial dimension is added, similar to branches in GitHub. Project 0 represents the basic project, which is the main line, and other projects are branches built on top of project 0. The basic project can independently and completely represent the current power grid, while other projects need to combine "project 0 library + equipment of this project in the equipment library + commissioning and decommissioning library" to determine a complete branch project.

[0049] When describing fault sets, fault settings are configured for specific equipment based on the equipment parameter library, regardless of the power grid operation mode or the type of simulation calculation. For a specific stability scan task across the entire network (such as an N-1 scan), only one set of fault information needs to be maintained for the entire network. The fault set export program determines whether the equipment in the fault set is in operation through the operation mode library and the planning scheme library, thereby determining the validity of the fault.

[0050] Fault set design;

[0051] Referring to the descriptions of basic power grid fault models in the "PSD-ST Transient Stability Program User Manual" and "PSASP7 User Manual," and also referencing the requirements for stability calculations in the "State Grid Safety and Stability Calculation Technical Specifications" and "Power System Safety and Stability Guidelines," a fault description table structure is established in the data, such as... Figure 2 As shown;

[0052] Neutral fault description;

[0053] The program only records the description of the fault itself and does not involve the specific simulation calculation program's requirements for the fault. The background program will convert and encapsulate the fault model corresponding to the specific calculation program. The faulty devices in the fault set are based on the power grid equipment parameter management library, associated through primary keys, and are independent of the power grid operation mode.

[0054] Simplify GUI and table structure design;

[0055] Referring to the BPA or PSASP fault setting interface, a simple GUI is adopted based on user experience to minimize the industry software threshold and simplify complex business details. For example, AC line faults have AC line fault rules as shown in Table 1. Each fault may have several ways of expression and combinations of several types of cards. For example, a three-phase short circuit fault can be expressed by LS(1), LS(96), and FLT(1). Even for professional power grid stability analysts, the learning threshold is very steep. By combining fault descriptions such as fault phase, fault type, grounding, and disconnector operation time, a set of time-series faults is formed, and the fault model is automatically selected. At the same time, the line series capacitors and reactors are disconnected. Users only need to focus on the key fault description fields and do not need to focus on the details of the fault model and the specific calculation program business requirements.

[0056] Table 1

[0057]

[0058] Fault screening based on power grid operation mode;

[0059] The fault set scanning program determines whether equipment is operational by using a runtime mode library and a planning scheme library, and then determines whether equipment-based faults are valid. It achieves network-wide maintenance with a single fault set, adaptable to stable scanning across every mode in the network.

[0060] The rules for filtering out operating equipment are as follows, taking a line as an example:

[0061] Line commissioning / discontinuation time within the valid time of the method

[0062] The equipment is only valid if its commissioning date is before the decommissioning date and its decommissioning date is after the decommissioning date.

[0063] The area where the busbars on both sides of the line are located is valid in the mode.

[0064] If one end is invalid, then the line is invalid.

[0065] The line is enabled in this method

[0066] Is the fault enabled in this export?

[0067] The line is not decommissioned under certain conditions.

[0068] Non-retirement in the basic plan and the specified plan

[0069] Effective in multi-branch schemes

[0070] If the line is not part of the basic plan, the dedicated equipment under other plans will be invalid when selecting a plan.

[0071] Mapping of fault sets to specific simulation program faults;

[0072] Currently supported power grid simulation programs include BPA, PASAP, and PSSE (long-term). Each program models the mathematical model of the power grid, but the format and carrier of the description file are different, and conversion is required according to specific rules.

[0073] Taking a line fault in the BPA conversion program as an example, the conversion process is as follows:

[0074] Device primary key mapping association;

[0075] The primary key of the exported faulty device must match the primary key of the device in the simulation calculation model. In the PSDB database, a device is uniquely identified using the database's primary key + foreign key method, thus establishing a connection between the faulty device and the device in the parameter library. In BPA, it is identified by the data node name + voltage level. For line or generator equipment, the parallel connection number is also considered to distinguish between multiple lines or multiple generators.

[0076] Regarding the export rules, refer to the "PSD-BPA Power Flow Program User Manual" and the "PSD-ST Transient Stability Program User Manual." The export program and BPA node naming and voltage determination rules are consistent, such as... Figure 3 and 4 As shown;

[0077] Fault model mapping and parameter mapping;

[0078] After completing the fault type mapping and device primary key mapping, the parameters of the fault model must be matched one by one, and the conversion of field type, unit, and precision must be correct and reasonable. This part of the work is "manual and meticulous work", and it needs to be continuously iterated and updated with the calculation model of the calculation program to describe the card relationships of hierarchical DC under the BPA calculation model, as well as the specific fault settings. Based on this model, the hierarchical DC fault description in PSDB is converted into the BPA hierarchical DC fault description format.

[0079] In PSDB, select this fault set, choose the simulation program type, and generate a stable scan fault file for a specific mode. The workflow is as follows: Figure 5 As shown, the program backend filters out valid faults under the selected method and exports fault descriptions suitable for this calculation program based on the calculation type (BPA, PSASP).

[0080] This invention also proposes a fault scanning system 200 based on a power grid simulation data management platform, such as... Figure 6 As shown, it includes:

[0081] Management database establishment unit 201 establishes a data management database based on the data types and operation and maintenance characteristics of the power grid;

[0082] Table structure establishment unit 202, based on the basic fault model of the power grid and the stability calculation requirements, calls data from the data management library to establish the fault description table structure of the data.

[0083] The fault screening unit 203, based on the fault description table structure, calls the data management library to obtain the operating mode and planning scheme, determines whether the operating mode and planning scheme are in operation and marks them, determines whether the power grid equipment fault is valid and marks it, and performs fault screening on the marked operating mode, planning scheme and power grid equipment fault;

[0084] The scanning unit 204 maps the selected faults to the simulated fault scanning model and uses the fault scanning model to perform fault scanning on the power grid.

[0085] The data management library includes: equipment parameter management library, operation mode management library, and planning scheme management library.

[0086] The selected faults are mapped to the simulation fault scanning model, including: device primary key mapping association and fault model mapping and device parameter mapping.

[0087] The fault description table structure includes: a neutral description of the fault, a simplified GUI, and a table structure.

[0088] This invention ensures that each generated fault is real and valid under the research power grid operation mode.

[0089] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The solutions in the embodiments of this application can be implemented in various computer languages, such as the object-oriented programming language Java and the interpreted scripting language JavaScript.

[0090] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0091] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0092] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0093] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0094] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A fault scanning method based on a power grid simulation data management platform, the method comprising: Establish a data management database based on the types of power grid data and the characteristics of its operation and maintenance; Based on the basic fault model of the power grid and the requirements for stability calculation, data is retrieved from the data management library, and a fault description table structure is established for the data. Based on the fault description table structure, the data management library is called to obtain the operating mode and planning scheme, and it is determined whether the operating mode and planning scheme are put into operation and marked. The validity of the power grid equipment fault is determined and marked. Fault screening is performed on the marked operating mode, planning scheme and power grid equipment fault. The selected faults are mapped to a simulated fault scanning model, and the fault scanning model is used to perform fault scanning on the power grid. Fault screening includes: Based on the fault set scanning program, the system determines whether the equipment should be put into operation by considering the operating mode and planning scheme, thereby determining whether the equipment-based faults are valid. Filter out the rules for running devices, including: The line commissioning and decommissioning time is within the valid time of the method; The equipment is only valid if its commissioning date is before the implementation date and its decommissioning date is after the implementation date. The area where the busbars on both sides of the line are located is valid under this method; If one end is invalid, then the line is invalid; The line is enabled in this mode; Is the fault enabled in this export? The line is not decommissioned under certain conditions; Non-retirement in the basic scheme and the specified scheme; Effective in multi-branch schemes; If the line is not part of the basic plan, the dedicated equipment under other plans will be invalid when selecting a plan.

2. The method according to claim 1, wherein the data management database comprises: Equipment parameter management library, operation mode management library, and planning scheme management library.

3. The method according to claim 1, wherein mapping the selected faults to the simulation fault scanning model comprises: Device primary key mapping association and fault model mapping and device parameter mapping.

4. The method according to claim 1, wherein the fault description table structure of the data includes: Neutral description of faults, simplifying the GUI and table structure.

5. A fault scanning system based on a power grid simulation data management platform, the system comprising: The management database establishment unit establishes a data management database based on the types of power grid data and the characteristics of its operation and maintenance. The table structure creation unit, based on the basic fault model of the power grid and the stability calculation requirements, calls the data obtained from the data management library to create a fault description table structure for the data. The fault screening unit, based on the fault description table structure, calls the data management library to obtain the operating mode and planning scheme, determines whether the operating mode and planning scheme are in operation and marks them, determines whether the power grid equipment faults are valid and marks them, and performs fault screening on the marked operating modes, planning schemes and power grid equipment faults; The scanning unit maps the selected faults to the simulated fault scanning model, and uses the fault scanning model to perform fault scanning on the power grid. Fault screening includes: Based on the fault set scanning program, the system determines whether the equipment should be put into operation by considering the operating mode and planning scheme, thereby determining whether the equipment-based faults are valid. Filter out the rules for running devices, including: The line commissioning and decommissioning time is within the valid time of the method; The equipment is only valid if its commissioning date is before the implementation date and its decommissioning date is after the implementation date. The area where the busbars on both sides of the line are located is valid under this method; If one end is invalid, then the line is invalid; The line is enabled in this mode; Is the fault enabled in this export? The line is not decommissioned under certain conditions; Non-retirement in the basic scheme and the specified scheme; Effective in multi-branch schemes; If the line is not part of the basic plan, the dedicated equipment under other plans will be invalid when selecting a plan.

6. The system according to claim 5, wherein the data management library comprises: Equipment parameter management library, operation mode management library, and planning scheme management library.

7. The system according to claim 5, wherein mapping the selected faults to the simulation fault scanning model includes: Device primary key mapping association and fault model mapping and device parameter mapping.

8. The system according to claim 5, wherein the fault description table structure of the data includes: Neutral description of faults, simplifying the GUI and table structure.

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