A ring network system operation scheme selection method and related device

Abstract

The present application discloses a method for selecting an operation scheme for a ring network system and a related device. The method includes: obtaining all busbar outlet schemes by scanning to obtain a line operation scheme set, wherein the busbar outlet scheme includes the relationship between the busbar and the outlet interval; setting the thermal stability capacity of the target component in each busbar outlet scheme in the line operation scheme set; calculating the component breaking margin factor corresponding to the preset fault set after the fault is disconnected based on the thermal stability capacity; calculating the section thermal stability limit value and the regional power supply capacity level value according to the component breaking margin factor; calculating the function value of the preset target function through the section thermal stability limit value, the regional power supply capacity level value and the short-circuit current margin obtained by scanning; and selecting the busbar outlet scheme corresponding to the largest function value of the preset target function as the target line operation scheme. The present application can solve the technical problem that the selection principle of the operation scheme in the existing technology is insufficient, resulting in the actual operation scheme selection being unreliable and inaccurate.

Description

Technical Field

[0001] The present application relates to the field of power dispatching technology, and in particular to a method for selecting an operation scheme for a ring network system and related devices. Background Art

[0002] Line distribution plan is an important task in the field of power dispatching. Due to the consideration of various different situations, the arrangement of line distribution plan has flexibility in selection. However, when there are many lines involved and the operation mode is more complicated, the consideration of line distribution plan is likely to lack completeness, that is, it is not sufficient, resulting in the lack of accuracy and reliability in the actual operation selection process. Summary of the Invention

[0003] The present application provides an operation scheme selection method and related devices for a ring network system, which are used to solve the technical problem that the selection principles of the operation schemes in the prior art are insufficient, resulting in the actual operation scheme selection being unreliable and inaccurate.

[0004] In view of this, a first aspect of the present application provides a method for selecting an operation scheme for a ring network system, comprising:

[0005] Obtain all busbar outgoing line plans by scanning to obtain a line operation plan set, wherein the busbar outgoing line plan includes the relationship between the busbar and the outgoing line bay;

[0006] Setting the thermal stability capacity of the target element in each of the busbar outlet schemes in the line operation scheme set;

[0007] Calculating the component breaking margin factor corresponding to the preset fault set after breaking based on the thermal stability capacity;

[0008] Calculating the section thermal stability limit value and the regional power supply capability level value respectively according to the component breaking margin factor;

[0009] Calculating a function value of a preset objective function by using the cross-section thermal stability limit value, the regional power supply capability level value, and the short-circuit current margin obtained by scanning;

[0010] The busbar outlet scheme corresponding to the largest function value of the preset objective function is selected as the target line operation scheme.

[0011] Optionally, all busbar outgoing line plans are acquired by scanning to obtain a line operation plan set, wherein the busbar outgoing line plan includes a relationship between a busbar and an outgoing line bay, including:

[0012] By scanning, taking a single busbar as the benchmark, the number of outgoing line intervals on each busbar is calculated using the permutation and combination method to obtain the busbar outgoing line plan;

[0013] The busbar outgoing line plans corresponding to all buses are accumulated to obtain a line operation plan set.

[0014] Optionally, all busbar outgoing line plans are acquired by scanning to obtain a line operation plan set, wherein the busbar outgoing line plan includes a relationship between buses and outgoing line bays, including:

[0015] By scanning, taking a single outgoing line as the benchmark, the bus to which each outgoing line belongs is described in a matrix description to obtain the bus outgoing line solution vector;

[0016] The busbar outgoing line scheme vectors corresponding to all outgoing lines are spliced ​​together to obtain a line operation scheme set, which is a matrix.

[0017] Optionally, the calculating, based on the thermal stability capacity, of a component breaking margin factor corresponding to the interruption of a preset fault set further includes:

[0018] The thermal stability section control value corresponding to the preset fault set after disconnection is calculated based on the thermal stability capacity.

[0019] A second aspect of the present application provides an operation scheme selection device for a ring network system, comprising:

[0020] A scheme formulation module is used to obtain all busbar outgoing line schemes by scanning to obtain a line operation scheme set, wherein the busbar outgoing line scheme includes the relationship between the busbar and the outgoing line bay;

[0021] A capacity setting module, configured to set the thermal stability capacity of a target element in each of the busbar outlet schemes in the line operation scheme set;

[0022] A first calculation module is used to calculate the component breaking margin factor corresponding to the preset fault set after the fault is broken based on the thermal stability capacity;

[0023] A second calculation module is used to calculate the section thermal stability limit value and the regional power supply capability level value respectively according to the component breaking margin factor;

[0024] A third calculation module is used to calculate the function value of a preset objective function through the section thermal stability limit value, the regional power supply capability level value and the short-circuit current margin obtained by scanning;

[0025] The target selection module is used to select the busbar outlet scheme corresponding to the maximum function value of the preset target function as the target line operation scheme.

[0026] Optionally, the plan formulation module is specifically used to:

[0027] By scanning, taking a single busbar as the benchmark, the number of outgoing line intervals on each busbar is calculated using the permutation and combination method to obtain the busbar outgoing line plan;

[0028] The busbar outgoing line plans corresponding to all buses are accumulated to obtain a line operation plan set.

[0029] Optionally, the plan formulation module is specifically used to:

[0030] By scanning, taking a single outgoing line as the benchmark, the bus to which each outgoing line belongs is described in a matrix description to obtain the bus outgoing line solution vector;

[0031] The busbar outgoing line scheme vectors corresponding to all outgoing lines are spliced ​​together to obtain a line operation scheme set, which is a matrix.

[0032] Optionally, also include:

[0033] The fourth calculation module is used to calculate the thermal stability section control value corresponding to the preset fault set after the fault set is disconnected based on the thermal stability capacity.

[0034] A third aspect of the present application provides an operation scheme selection device for a ring network system, the device comprising a processor and a memory;

[0035] The memory is used to store program code and transmit the program code to the processor;

[0036] The processor is used to execute the operation scheme selection method of the ring network system described in the first aspect according to the instructions in the program code.

[0037] In a fourth aspect, the present application provides a computer-readable storage medium, which is used to store program code, and the program code is used to execute the operation scheme selection method of the ring network system described in the first aspect.

[0038] It can be seen from the above technical solutions that the embodiments of the present application have the following advantages:

[0039] In the present application, a method for selecting an operation scheme for a ring network system is provided, comprising: acquiring all busbar outlet schemes by scanning to obtain a line operation scheme set, wherein the busbar outlet scheme includes the relationship between the busbar and the outlet interval; setting the thermal stability capacity of the target element in each busbar outlet scheme in the line operation scheme set; calculating the element breaking margin factor corresponding to the preset fault set after the fault is disconnected based on the thermal stability capacity; calculating the section thermal stability limit value and the regional power supply capacity level value according to the element breaking margin factor; calculating the function value of the preset objective function through the section thermal stability limit value, the regional power supply capacity level value and the short-circuit current margin obtained by scanning; and selecting the busbar outlet scheme corresponding to the largest function value of the preset objective function as the target line operation scheme.

[0040] The operation scheme selection method of the ring network system provided by the present application, in the process of preparing the line operation scheme set, scans all the line connections and hanging relationships by scanning, and organizes them into busbar outlet schemes; then selects the best scheme in the line operation scheme set, and the selection method is to formulate a multi-index optimization function, which includes the optimization of the cross-section thermal stability limit value, the regional power supply capacity level value and the short-circuit current margin. The scheme corresponding to the largest optimization function value is selected as the best scheme, and all schemes can participate in the selection, and the multi-objective optimization selection of the best scheme is more accurate and reliable. Therefore, the present application can solve the technical problem that the selection principle of the operation scheme of the existing technology lacks sufficiency, resulting in the actual operation scheme selection being not reliable and accurate enough. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 A flowchart of a method for selecting an operation scheme for a ring network system provided in an embodiment of the present application;

[0042] Figure 2 A schematic diagram of the structure of an operation scheme selection device for a ring network system provided in an embodiment of the present application;

[0043] Figure 3 A schematic diagram of the main wiring of a 500kV substation provided in an embodiment of the present application;

[0044] Figure 4 The topological diagram of the 220kV and above grid structure in a certain area is provided for the application example of this application. DETAILED DESCRIPTION

[0045] In order to help those skilled in the art better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0046] For easier understanding, see Figure 1 , an embodiment of a method for selecting an operation scheme of a ring network system provided by the present application includes:

[0047] Step 101: Obtain all busbar outgoing line plans by scanning to obtain a line operation plan set. The busbar outgoing line plan includes the relationship between the busbar and the outgoing line bay.

[0048] Furthermore, step 101 includes:

[0049] By scanning, taking a single busbar as the benchmark, the number of outgoing line intervals on each busbar is calculated using the permutation and combination method to obtain the busbar outgoing line plan;

[0050] The busbar outgoing line plans corresponding to all buses are accumulated to obtain the line operation plan set.

[0051] If there are P schemes in the line operation scheme set, and there are i outgoing line intervals, that is, i outgoing lines, and there are j busbars in the scheme, the specific schemes can be exhaustively enumerated according to the permutation and combination method:

[0052] Considering the case where all outgoing lines are connected to any busbar, there are P1 solutions, that is, P1 = 1. Considering the case where any outgoing line bay is connected to any busbar, there are P2 solutions, that is:

[0053]

[0054] Consider the case where any two outgoing line bays are connected to any busbar. There are three solutions:

[0055]

[0056] Consider the case where i-1 outgoing line intervals are connected to any busbar. The solutions at this time are P i Species, namely:

[0057]

[0058] Therefore, the final line operation plan set can be expressed as:

[0059]

[0060] Furthermore, step 101 includes:

[0061] By scanning, taking a single outgoing line as the benchmark, the bus to which each outgoing line belongs is described in a matrix description to obtain the bus outgoing line solution vector;

[0062] The busbar outgoing line scheme vectors corresponding to all outgoing lines are spliced ​​together to obtain a line operation scheme set, which is a matrix.

[0063] If there are many outgoing line intervals, the line deployment plan analysis can also be performed based on a single outgoing line. This embodiment mainly lists an example to clearly describe the method for obtaining a line operation plan set based on a single outgoing line interval. Figure 3 ,Assume that there are 6 outgoing line intervals, namely a, b, c, d, e, and f, and 2 busbars. Assume an m×n matrix to describe the schemes of different outgoing line-to-busbar connections, that is, the line operation scheme set.

[0064] When considering 6 outgoing line bays connected to any busbar, the solution is expressed as: A = [abcdef]; when considering 1 outgoing line bay connected to any busbar, the solution is expressed as:

[0065]

[0066] Considering that two outgoing lines are connected to any busbar, the solution is expressed as:

[0067]

[0068] Considering that three outgoing lines are connected to any busbar, the solution is expressed as:

[0069]

[0070] Finally, the total line operation plan set P based on the outgoing line interval can be obtained; that is, the above matrix.

[0071] Step 102: Set the thermal stability capacity of the target component in each busbar outlet scheme in the line operation scheme set.

[0072] Based on the obtained set P of multiple line operation schemes, the thermal stability capacity of the target components connected in each scheme can be calculated. The specific thermal stability capacity calculation method can be calculated based on existing technology. As long as the thermal stability capacity of the components on the line can be determined, it will not be elaborated here.

[0073] Step 103: Calculate the component breaking margin factor corresponding to the preset fault set after the fault is broken based on the thermal stability capacity.

[0074] The preset fault set is a specific operating plan set according to needs. It can be a fault plan in fault operation analysis or an operating plan for other special needs. The BPA software can automatically search for the preset fault operation plan and then calculate the corresponding component breaking margin factor.

[0075] Furthermore, step 103 further includes:

[0076] The thermal stability section control value corresponding to the preset fault set after disconnection is calculated based on the thermal stability capacity.

[0077] In addition to calculating the component breaking margin factor, it is also necessary to calculate the thermal stability section control value, which is also calculated based on the thermal stability capacity. The specific process can be calculated based on existing technology and will not be repeated here.

[0078] Step 104: Calculate the section thermal stability limit value and the regional power supply capability level value respectively according to the component breaking margin factor.

[0079] In the process of calculating the thermal stability limit value of the section, in addition to the component breaking margin factor, it is also necessary to analyze and calculate based on the obtained thermal stability section control value; E i Indicates the thermal stability limit value, using F i Indicates the regional power supply capability level.

[0080] Step 105 : Calculate the function value of the preset objective function by using the cross-section thermal stability limit value, the regional power supply capability level value, and the short-circuit current margin obtained by scanning.

[0081] Adopt I yi Represents the short-circuit current margin, which is obtained by scanning and calculating the short-circuit current level of the entire network. The preset objective function is:

[0082] S i =λ1E i +λ2I yi +λ3F i ;

[0083] Where i = 1, 2, ..., P, λ1, λ2, and λ3 are weight coefficients, and λ1 + λ2 + λ3 = 1. Substitute each indicator into the formula and optimize each solution one by one to obtain the function value corresponding to each solution.

[0084] Step 106: Select the busbar outlet plan corresponding to the maximum function value of the preset objective function as the target line operation plan.

[0085] The function values ​​can be sorted in descending order, and the solution corresponding to the first function value is selected as the optimal target line operation solution.

[0086] For ease of understanding, this application also provides an application example, please refer to Figure 3 and Figure 4 , Figure 4 This is a topological diagram of the grid structure of 220kV and above in a certain area. Figure 3 This is the main wiring diagram for 500kV Substation B. The wiring is in parallel operation with two busbar sections, 1M and 5M, and two sections, 2M and 6M. The 220kV busbar is split horizontally, with 1M (5M) representing a, c, d, and f, and 2M (6M) representing b and e. Arrange all the outgoing line intervals on the 220kV busbars of 500kV Substation B (using a "2+4" arrangement, with lines b and e on one busbar and the others on the other), and set A to be an m×n matrix. The generated arrangement is then stored in matrix A. A preset accident set and the thermal stability capacity of each component in the power grid are then set. The preset accident set may include N-1 important electrical components and N-1 important interconnecting lines. The thermal stability capacity of components at voltage levels of 220kV and above in a certain region is shown in Table 1.

[0087] Table 1 Thermal stability capacity of electrical components

[0088] element 500kV Station A #1 main transformer 500kV Substation B #1 main transformer 220kV A-E line ... Thermal stability capacity XXMVA XXMVA XXMW ...

[0089] BPA software is used to programmatically scan multiple grid objectives under the line operation plan set P. The corresponding component interruption margin factors, section thermal stability limits, and regional power supply capacity values ​​after the expected fault set is interrupted are calculated. The short-circuit current level of the entire network is scanned and calculated, and the short-circuit current margin is derived. Finally, the objective function is solved based on the calculated indicators, and the line connection plan with the largest function value is selected as the operation plan.

[0090] The method for selecting an operation scheme for a ring network system provided in an embodiment of the present application, in the process of preparing a line operation scheme set, scans all line connections and hookup relationships by scanning, and organizes them into busbar outlet schemes; then selects the optimal scheme from the line operation scheme set, and the selection method is to formulate a multi-index optimization function, which includes the optimization of the cross-section thermal stability limit value, the regional power supply capacity level value and the short-circuit current margin. The scheme corresponding to the largest optimization function value is selected as the optimal scheme, and all schemes can participate in the selection, and the multi-objective optimization selection of the optimal scheme is also more accurate and reliable. Therefore, the embodiment of the present application can solve the technical problem that the selection principle of the operation scheme of the prior art lacks sufficiency, resulting in the actual operation scheme selection being not reliable and accurate enough.

[0091] For easier understanding, see Figure 2 The present application provides an embodiment of a ring network system operation scheme selection device, including:

[0092] The plan formulation module 201 is used to obtain all busbar outgoing line plans by scanning to obtain a line operation plan set. The busbar outgoing line plan includes the relationship between the busbar and the outgoing line bay;

[0093] The capacity setting module 202 is used to set the thermal stability capacity of the target element in each busbar outlet scheme in the line operation scheme set;

[0094] The first calculation module 203 is used to calculate the component breaking margin factor corresponding to the preset fault set after the fault is broken based on the thermal stability capacity;

[0095] The second calculation module 204 is used to calculate the section thermal stability limit value and the regional power supply capability level value according to the component breaking margin factor;

[0096] The third calculation module 205 is used to calculate the function value of the preset objective function by using the cross-section thermal stability limit value, the regional power supply capability level value and the short-circuit current margin obtained by scanning;

[0097] The target selection module 206 is configured to select the busbar outlet scheme corresponding to the maximum function value of the preset target function as the target line operation scheme.

[0098] Furthermore, the plan formulation module 201 is specifically configured to:

[0099] By scanning, taking a single busbar as the benchmark, the number of outgoing line intervals on each busbar is calculated using the permutation and combination method to obtain the busbar outgoing line plan;

[0100] The busbar outgoing line plans corresponding to all buses are accumulated to obtain the line operation plan set.

[0101] Furthermore, the plan formulation module 201 is specifically configured to:

[0102] By scanning, taking a single outgoing line as the benchmark, the bus to which each outgoing line belongs is described in a matrix description to obtain the bus outgoing line solution vector;

[0103] The busbar outgoing line scheme vectors corresponding to all outgoing lines are spliced ​​together to obtain a line operation scheme set, which is a matrix.

[0104] Furthermore, it also includes:

[0105] The fourth calculation module 207 is used to calculate the corresponding thermal stability section control value after the preset fault set is disconnected based on the thermal stability capacity.

[0106] The present application also provides an operation scheme selection device for a ring network system, the device including a processor and a memory;

[0107] The memory is used to store program codes and transmit the program codes to the processor;

[0108] The processor is configured to execute the method for selecting an operation scheme of the ring network system in the above method embodiment according to instructions in the program code.

[0109] The present application also provides a computer-readable storage medium, which is used to store program code, and the program code is used to execute the operation scheme selection method of the ring network system in the above method embodiment.

[0110] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0111] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0112] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0113] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a number of instructions for executing all or part of the steps of the method described in each embodiment of the present application through a computer device (which can be a personal computer, server, or network device, etc.). The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (English full name: Read-Only Memory, English abbreviation: ROM), random access memory (English full name: Random Access Memory, English abbreviation: RAM), disk or optical disk and other media that can store program code.

[0114] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for selecting an operation scheme of a ring network system, characterized in that: include: All busbar outgoing line plans are acquired by scanning to obtain a line operation plan set. The busbar outgoing line plan includes the relationship between the busbar and the outgoing line bay. The acquisition process includes: By scanning, taking a single busbar as the benchmark, the number of outgoing line intervals on each busbar is calculated using the permutation and combination method to obtain the busbar outgoing line plan; Accumulating the busbar outgoing line plans corresponding to all buses to obtain a line operation plan set; or: By scanning, taking a single outgoing line as the benchmark, the bus to which each outgoing line belongs is described in a matrix description to obtain the bus outgoing line solution vector; splicing the busbar outgoing line scheme vectors corresponding to all outgoing lines to obtain a line operation scheme set, wherein the line operation scheme set is a matrix; Setting the thermal stability capacity of the target element in each of the busbar outlet schemes in the line operation scheme set; Calculating the component breaking margin factor corresponding to the preset fault set after breaking based on the thermal stability capacity; Calculating the section thermal stability limit value and the regional power supply capability level value respectively according to the component breaking margin factor; The function value of a preset objective function is calculated by the section thermal stability limit value, the regional power supply capability level value and the short-circuit current margin obtained by scanning. The preset objective function is: S i =λ1E i +λ2I yi +λ3F i ; Where i = 1, 2, ..., P, λ1, λ2 and λ3 are weight coefficients, and λ1 + λ2 + λ3 = 1, E i , I yi 、F i Respectively represent the thermal stability limit value, the short-circuit current margin and the regional power supply capability level value; The busbar outlet scheme corresponding to the largest function value of the preset objective function is selected as the target line operation scheme.

2. The method for selecting an operation scheme of a ring network system according to claim 1, characterized in that: The calculating of the component breaking margin factor corresponding to the preset fault set after breaking based on the thermal stability capacity also includes: The thermal stability section control value corresponding to the preset fault set after disconnection is calculated based on the thermal stability capacity.

3. A device for selecting an operation scheme of a ring network system, characterized in that: include: The scheme formulation module is used to obtain all busbar outgoing line schemes by scanning to obtain a line operation scheme set. The busbar outgoing line scheme includes the relationship between the busbar and the outgoing line bay. The scheme formulation module is specifically used to: By scanning, taking a single busbar as the benchmark, the number of outgoing line intervals on each busbar is calculated using the permutation and combination method to obtain the busbar outgoing line plan; Accumulating the busbar outgoing line plans corresponding to all buses to obtain a line operation plan set; Alternatively, the program formulation module is specifically used to: By scanning, taking a single outgoing line as the benchmark, the bus to which each outgoing line belongs is described in a matrix description to obtain the bus outgoing line solution vector; splicing the busbar outgoing line scheme vectors corresponding to all outgoing lines to obtain a line operation scheme set, wherein the line operation scheme set is a matrix; A capacity setting module, configured to set the thermal stability capacity of a target element in each of the busbar outlet schemes in the line operation scheme set; A first calculation module is used to calculate the component breaking margin factor corresponding to the preset fault set after the fault is broken based on the thermal stability capacity; A second calculation module is used to calculate the section thermal stability limit value and the regional power supply capability level value respectively according to the component breaking margin factor; The third calculation module is used to calculate the function value of a preset objective function based on the cross-section thermal stability limit value, the regional power supply capability level value, and the short-circuit current margin obtained by scanning. The preset objective function is: S i =λ1E i +λ2I yi +λ3F i ; Where i = 1, 2, ..., P, λ1, λ2 and λ3 are weight coefficients, and λ1 + λ2 + λ3 = 1, E i , I yi 、F i Respectively represent the thermal stability limit value, the short-circuit current margin and the regional power supply capability level value; The target selection module is used to select the busbar outlet scheme corresponding to the maximum function value of the preset target function as the target line operation scheme.

4. The operation scheme selection device for the ring network system according to claim 3, characterized in that: Also includes: The fourth calculation module is used to calculate the thermal stability section control value corresponding to the preset fault set after the fault set is disconnected based on the thermal stability capacity.

5. An operation scheme selection device for a ring network system, characterized in that: The device includes a processor and a memory; The memory is used to store program code and transmit the program code to the processor; The processor is configured to execute the method for selecting an operation scheme for a ring network system according to any one of claims 1 to 2 according to instructions in the program code.

6. A computer-readable storage medium, characterized in that The computer-readable storage medium is used to store program codes, and the program codes are used to execute the method for selecting an operation scheme of a ring network system according to any one of claims 1 to 2.

Images