A circuit breaker configuration method and system for suppressing short circuit current of a power grid

Abstract

The application discloses a circuit breaker configuration method and system for inhibiting short-circuit current of a power grid, and belongs to the technical field of power systems. The method comprises the following steps: determining the short-circuit current characteristics of a target power system and a substation; based on the short-circuit current characteristics, initially selecting a candidate arrangement mode from all arrangement modes of circuit breakers, and determining the system influence of the candidate arrangement mode on the target power system and the substation, so as to obtain a target candidate arrangement mode; determining the feasibility and economy of the target candidate arrangement mode, selecting a target candidate arrangement mode with optimal feasibility and optimal economy as a final target arrangement mode, and determining the key parameters and action strategies of the circuit breakers under the final target arrangement mode; and configuring the circuit breakers by using the key parameters and action strategies, the final target arrangement mode, the key parameters and the action strategies. The application provides technical support for inhibiting short-circuit current of a power grid.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and more particularly, to a circuit breaker configuration method and system for suppressing short-circuit current in a power grid. Background Art

[0002] With the rapid development and increasing scale of power grids, short-circuit current levels in my country's power systems are increasing annually. Excessive short-circuit currents can endanger the safe and stable operation of power systems and the electrical equipment themselves. Conventional short-circuit current control measures in practical systems primarily include shutting down lines and installing current-limiting reactors. However, these measures often lead to reduced power supply reliability and increased system losses. Summary of the Invention

[0003] In response to the above problems, the present invention proposes a circuit breaker configuration method for suppressing short-circuit current in a power grid, comprising:

[0004] Acquiring topological data of a target power system and substation, establishing a topological model of the target power system and substation based on the topological data, and determining short-circuit current characteristics of the target power system and substation based on the topological model;

[0005] Based on the short-circuit current characteristics, preliminarily selecting alternative layouts from all layouts of circuit breakers, determining the system impacts of the alternative layouts on the target power system and substation, and eliminating alternative layouts with large system impacts to obtain a target alternative layout;

[0006] Determine the feasibility and economy of the target alternative layout, select the target alternative layout with the best feasibility and the best economy as the final target layout, and determine the key parameters and action strategy of the circuit breaker under the final target layout. Configure the circuit breaker with the key parameters and action strategy, the final target layout, key parameters and action strategy.

[0007] Optionally, determining short-circuit current characteristics of the target power system and substation based on the topology model includes:

[0008] Determining a wiring method of a substation and an actual wiring arrangement of equipment in the substation based on the topology model, and establishing a simulation model based on wiring impedance in the substation according to the baseline method and the actual wiring arrangement;

[0009] According to the operation mode of the power grid, a power grid operation model is established using an equivalent simplified modeling method;

[0010] Establish an action characteristic model based on the action characteristics of protection and circuit breakers in the substation;

[0011] Based on the simulation model, the power grid operation model and the action characteristic model, an electromagnetic transient simulation model for simulating the circuit breaker breaking current is established;

[0012] The breaking current of the circuit breaker is simulated using the electromagnetic transient simulation model to obtain simulation data. Based on the simulation data, the transient characteristics of the circuit breaker current when a fault occurs at each node in the substation, the circuit breaker where the short-circuit current exceeds the standard fault and its location and the short-circuit current levels provided by different branches when the current exceeds the standard fault point are determined.

[0013] Optionally, when establishing a simulation model based on the wiring impedance within the substation, the lines directly connected to the substation are retained, and the external equipment of the substation is simplified using the Thevenin equivalent method to simplify the external equipment into a voltage source and equivalent impedance.

[0014] Optionally, the action characteristics include at least one of the following: protection action time and circuit breaker breaking characteristics.

[0015] Optionally, based on the short-circuit current characteristics, an alternative arrangement is preliminarily selected from all arrangements of the circuit breaker, including:

[0016] determining a topology of the power system based on the short-circuit current characteristics and classifying the topology to obtain a classification result;

[0017] Based on the classification result, defining a topological subset of the substation in a preset manner;

[0018] Determining short-circuit current suppression effects under different circuit breaker arrangements according to the topology subset;

[0019] Based on the suppression effect, an alternative arrangement is preliminarily selected from all arrangements of the circuit breaker.

[0020] Optionally, the preset manner includes at least one of the following: definition in a basic topology unit manner, definition in a secondary topology unit manner, and definition in a tertiary topology unit manner.

[0021] Optionally, based on the suppression effect, an alternative arrangement is initially selected from all arrangements of the circuit breaker, including:

[0022] Under different preset modes, the short-circuit current suppression levels under different arrangements of the circuit breaker are determined, and the arrangement corresponding to the short-circuit current suppression level that meets the preset requirements is used as an alternative arrangement.

[0023] Optionally, determining the system impact of the alternative arrangement on the target power system and substation includes:

[0024] Calculate the impact of circuit breaker disconnection operations on power system power flow, stability, and overvoltage under various alternative layouts during normal and faulty operation of the power system.

[0025] Optional, key parameters include: maximum breaking current of the circuit breaker and circuit breaker parameters when short-circuit current exceeds the limit.

[0026] Optional action strategy, including:

[0027] During normal operation, the isolation topology unit is connected to the power system;

[0028] When a fault occurs, the circuit breaker is commanded to open, disconnecting the isolation topology unit from the power system, reducing the short-circuit current after the fault, and allowing the relay protection device to operate normally to eliminate the fault;

[0029] After the fault is cleared, the circuit breaker is commanded to reclose and the isolated topology unit is reconnected to the power system.

[0030] In another aspect, the present invention further provides a circuit breaker configuration system for suppressing short-circuit current in a power grid, comprising:

[0031] a simulation unit, configured to obtain topological data of a target power system and substation, establish a topological model of the target power system and substation based on the topological data, and determine short-circuit current characteristics of the target power system and substation based on the topological model;

[0032] a selection unit configured to preliminarily select an alternative arrangement from all arrangements of circuit breakers based on the short-circuit current characteristics, determine the system impact of the alternative arrangement on the target power system and substation, and eliminate the alternative arrangement with a large system impact to obtain a target alternative arrangement;

[0033] a configuration unit, configured to determine the feasibility and economy of the target alternative layout modes, select the target alternative layout mode with the best feasibility and the best economy as the final target layout mode, determine the key parameters and action strategy of the circuit breaker under the final target layout mode, and configure the circuit breaker with the key parameters and action strategy, the final target layout mode, the key parameters and the action strategy.

[0034] Optionally, the simulation unit determines the short-circuit current characteristics of the target power system and substation based on the topology model, including:

[0035] Determining a wiring method of a substation and an actual wiring arrangement of equipment in the substation based on the topology model, and establishing a simulation model based on wiring impedance in the substation according to the baseline method and the actual wiring arrangement;

[0036] According to the operation mode of the power grid, a power grid operation model is established using an equivalent simplified modeling method;

[0037] Establish an action characteristic model based on the action characteristics of protection and circuit breakers in the substation;

[0038] Based on the simulation model, the power grid operation model and the action characteristic model, an electromagnetic transient simulation model for simulating the circuit breaker breaking current is established;

[0039] The breaking current of the circuit breaker is simulated using the electromagnetic transient simulation model to obtain simulation data. Based on the simulation data, the transient characteristics of the circuit breaker current when a fault occurs at each node in the substation, the circuit breaker where the short-circuit current exceeds the standard fault and its location and the short-circuit current levels provided by different branches when the current exceeds the standard fault point are determined.

[0040] Optionally, when establishing a simulation model based on the wiring impedance within the substation, the lines directly connected to the substation are retained, and the external equipment of the substation is simplified using the Thevenin equivalent method to simplify the external equipment into a voltage source and equivalent impedance.

[0041] Optionally, the action characteristics include at least one of the following: protection action time and circuit breaker breaking characteristics.

[0042] Optionally, the selection unit preliminarily selects an alternative arrangement from all arrangements of the circuit breaker based on the short-circuit current characteristics, including:

[0043] determining a topology of the power system based on the short-circuit current characteristics and classifying the topology to obtain a classification result;

[0044] Based on the classification result, defining a topological subset of the substation in a preset manner;

[0045] Determining short-circuit current suppression effects under different circuit breaker arrangements according to the topology subset;

[0046] Based on the suppression effect, an alternative arrangement is preliminarily selected from all arrangements of the circuit breaker.

[0047] Optionally, the preset manner includes at least one of the following: definition in a basic topology unit manner, definition in a secondary topology unit manner, and definition in a tertiary topology unit manner.

[0048] Optionally, based on the suppression effect, an alternative arrangement is initially selected from all arrangements of the circuit breaker, including:

[0049] Under different preset modes, the short-circuit current suppression levels under different arrangements of the circuit breaker are determined, and the arrangement corresponding to the short-circuit current suppression level that meets the preset requirements is used as an alternative arrangement.

[0050] Optionally, the selection unit determines the system impact of the alternative arrangement on the target power system and substation, including:

[0051] Calculate the impact of circuit breaker disconnection operations on power system power flow, stability, and overvoltage under various alternative layouts during normal and faulty operation of the power system.

[0052] Optional, key parameters include: maximum breaking current of the circuit breaker and circuit breaker parameters when short-circuit current exceeds the limit.

[0053] Optional action strategy, including:

[0054] During normal operation, the isolation topology unit is connected to the power system;

[0055] When a fault occurs, the circuit breaker is commanded to open, disconnecting the isolation topology unit from the power system, reducing the short-circuit current after the fault, and allowing the relay protection device to operate normally to eliminate the fault;

[0056] After the fault is cleared, the circuit breaker is commanded to reclose and the isolated topology unit is reconnected to the power system.

[0057] In yet another aspect, the present invention further provides a computing device comprising: one or more processors;

[0058] a processor for executing one or more programs;

[0059] When the one or more programs are executed by the one or more processors, the above-described method is implemented.

[0060] In another aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed, the method described above is implemented.

[0061] Compared with the prior art, the present invention has the following beneficial effects:

[0062] The present invention provides a circuit breaker configuration method for suppressing short-circuit current in a power grid, comprising: obtaining topological data of a target power system and substation, establishing a topological model of the target power system and substation based on the topological data, and determining the short-circuit current characteristics of the target power system and substation based on the topological model; preliminarily selecting alternative layouts from all circuit breaker layouts based on the short-circuit current characteristics, and determining the system impact of the alternative layouts on the target power system and substation, eliminating alternative layouts with large system impacts to obtain a target alternative layout; determining the feasibility and economy of the target alternative layouts, selecting the target alternative layout with the best feasibility and economy as the final target layout, and determining key parameters and action strategies of the circuit breaker under the final target layout, and configuring the circuit breaker using the key parameters and action strategies, the final target layout, the key parameters, and the action strategies. The present invention provides technical support for suppressing short-circuit current in a power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 is a flow chart of the method of the present invention;

[0064] Figure 2 is a flow chart of an embodiment of the method of the present invention;

[0065] Figure 3 This is a schematic diagram of the wiring principle of a substation according to an embodiment of the method of the present invention;

[0066] Figure 4 A schematic diagram of the system wiring principle of an embodiment of the method of the present invention;

[0067] Figure 5 The system short-circuit current suppression effect of the method embodiment of the present invention;

[0068] Figure 6 It is a structural diagram of the system of the present invention. DETAILED DESCRIPTION

[0069] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to provide a thorough and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments shown in the accompanying drawings is not intended to limit the present invention. In the accompanying drawings, identical elements are denoted by the same reference numerals.

[0070] Unless otherwise specified, the terms used herein (including technical terms) have the meanings commonly understood by those skilled in the art. In addition, it is understood that terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0071] Example 1:

[0072] The present invention proposes a circuit breaker configuration method for suppressing short-circuit current in a power grid, such as Figure 1 Shown, including:

[0073] Step 1: Acquire topological data of a target power system and substation, establish a topological model of the target power system and substation based on the topological data, and determine short-circuit current characteristics of the target power system and substation based on the topological model;

[0074] Step 2: Based on the short-circuit current characteristics, preliminarily select alternative layouts from all layouts of circuit breakers, determine the system impact of the alternative layouts on the target power system and substation, and eliminate the alternative layouts with large system impact to obtain the target alternative layout;

[0075] Step 3: Determine the feasibility and economy of the target alternative layout mode, select the target alternative layout mode with the best feasibility and the best economy as the final target layout mode, and determine the key parameters and action strategy of the circuit breaker under the final target layout mode. Configure the circuit breaker with the key parameters and action strategy, the final target layout mode, key parameters and action strategy.

[0076] The step of determining the short-circuit current characteristics of the target power system and substation based on the topology model includes:

[0077] Determining a wiring method of a substation and an actual wiring arrangement of equipment in the substation based on the topology model, and establishing a simulation model based on wiring impedance in the substation according to the baseline method and the actual wiring arrangement;

[0078] According to the operation mode of the power grid, a power grid operation model is established using an equivalent simplified modeling method;

[0079] Establish an action characteristic model based on the action characteristics of protection and circuit breakers in the substation;

[0080] Based on the simulation model, the power grid operation model and the action characteristic model, an electromagnetic transient simulation model for simulating the circuit breaker breaking current is established;

[0081] The breaking current of the circuit breaker is simulated using the electromagnetic transient simulation model to obtain simulation data. Based on the simulation data, the transient characteristics of the circuit breaker current when a fault occurs at each node in the substation, the circuit breaker where the short-circuit current exceeds the standard fault and its location and the short-circuit current levels provided by different branches when the current exceeds the standard fault point are determined.

[0082] When establishing a simulation model based on the wiring impedance within the substation, the lines directly connected to the substation are retained, and the external equipment of the substation is simplified using the Thevenin equivalent method to simplify the external equipment into a voltage source and an equivalent impedance.

[0083] The action characteristics include at least one of the following: protection action time and circuit breaker breaking characteristics.

[0084] Based on the short-circuit current characteristics, an alternative arrangement is initially selected from all arrangements of the circuit breaker, including:

[0085] determining a topology of the power system based on the short-circuit current characteristics and classifying the topology to obtain a classification result;

[0086] Based on the classification result, defining a topological subset of the substation in a preset manner;

[0087] Determining short-circuit current suppression effects under different circuit breaker arrangements according to the topology subset;

[0088] Based on the suppression effect, an alternative arrangement is preliminarily selected from all arrangements of the circuit breaker.

[0089] The preset manner includes at least one of the following: definition in a basic topology unit manner, definition in a secondary topology unit manner, and definition in a tertiary topology unit manner.

[0090] Among them, based on the suppression effect, an alternative arrangement is initially selected from all arrangements of the circuit breaker, including:

[0091] Under different preset modes, the short-circuit current suppression levels under different arrangements of the circuit breaker are determined, and the arrangement corresponding to the short-circuit current suppression level that meets the preset requirements is used as an alternative arrangement.

[0092] Determining the system impact of the alternative arrangement on the target power system and substation includes:

[0093] Calculate the impact of circuit breaker disconnection operations on power system power flow, stability, and overvoltage under various alternative layouts during normal and faulty operation of the power system.

[0094] Among them, the key parameters include: the maximum breaking current of the circuit breaker and the circuit breaker parameters when the short-circuit current exceeds the standard.

[0095] Among them, the action strategy includes:

[0096] During normal operation, the isolation topology unit is connected to the power system;

[0097] When a fault occurs, the circuit breaker is commanded to open, disconnecting the isolation topology unit from the power system, reducing the short-circuit current after the fault, and allowing the relay protection device to operate normally to eliminate the fault;

[0098] After the fault is cleared, the circuit breaker is commanded to reclose and the isolated topology unit is reconnected to the power system.

[0099] The method of the present invention is further described below with reference to the embodiments:

[0100] like Figure 2 As mentioned above, the implementation process includes:

[0101] (1) Analysis of substation short-circuit current characteristics:

[0102] a. Establish a simulation model that takes into account the system and substation internal wiring topology. Based on the substation wiring method and the actual wiring layout of the substation equipment, establish a simulation model that takes into account the wiring impedance within the substation.

[0103] b. Perform equivalent simplified modeling based on the grid operation mode. When modeling, retain the lines directly connected to the substation under study, and use the Thevenin equivalent method to simplify the external parts into voltage sources and equivalent impedances.

[0104] c. Establish protection and circuit breaker action characteristic models; including protection action time, circuit breaker breaking characteristics, etc.;

[0105] d. Based on the above models, an electromagnetic transient simulation model of the circuit breaker breaking current is established;

[0106] e. Simulate and study the transient characteristics of circuit breaker currents at various nodes within the station when a fault occurs, and determine the location of the fault where the short-circuit current exceeds the standard, as well as the circuit breaker where the short-circuit current exceeds the standard;

[0107] e. Study the short-circuit current levels provided by different branches when the fault point exceeds the standard;

[0108] (2) Preliminary selection of fast circuit breaker layout:

[0109] a. Determine the system topology and classification;

[0110] Take the substation two-thirds connection as an example, Figure 3As shown in the figure, it is assumed that there are n complete 3 / 2 wiring strings in the substation. The circuit breaker close to busbar M1 on the i-th wiring string is denoted as C i1 , the outgoing line controlled by the circuit breaker is marked as L i1 ; The circuit breaker close to busbar M2 is marked as C i3 , the outgoing line controlled by the circuit breaker is marked as L i2 , the circuit breaker in this string is denoted as C i2 (i=1,2,……,n), if there is a bus tie circuit breaker, it will be named C M11 、C M121 、C M21 、C M22 This determines the system operation mode and topology.

[0111] b. Define the substation topology subset as follows;

[0112] Basic topology unit: Each outgoing line and main transformer branch is defined as a basic topology unit. Each topology unit can provide short-circuit current to the system. In the typical two-thirds wiring method, each basic topology unit is connected to the rest of the system through two circuit breakers.

[0113] Secondary topology unit: Two basic topology units directly connected through a single circuit breaker are defined as a secondary topology unit. For a typical two-thirds wiring method, the two basic topology units in each wiring string form a secondary topology unit. Each secondary topology unit is connected to the rest of the system through two circuit breakers.

[0114] Three-level topology unit: If a bus tie breaker is present in the substation, the wiring string connected to the two busbar sections connected to the bus tie breaker forms a three-level topology unit. Each three-level topology unit is connected to the rest of the system via two bus tie breakers. If there is no bus tie breaker, there is no three-level topology unit.

[0115] c. Short-circuit current suppression effect under different fast circuit breaker arrangements;

[0116] Calculate the maximum short-circuit current level after disconnecting the two circuit breakers directly connecting each basic topology unit to the system. For different basic topology units, the short-circuit current levels are I F111 , I F112 , I F113 ...I F1n3. There are 3n groups in total. Among the 3n groups of short-circuit current levels, if there is one that satisfies I F1xx CB If no such solution exists, proceed to the next step.

[0117] ​Calculate the maximum short-circuit current level after disconnecting the two circuit breakers directly connecting each secondary topology unit to the system. For different secondary topology units, the short-circuit current levels are I F21 , I F22 、...I F2n. There are n groups in total. Among the n groups of short-circuit current levels, if there is one that satisfies I F2x CB If no such solution exists, proceed to the next step.

[0118] Calculate the maximum short-circuit current level after disconnecting the two circuit breakers directly connected to each three-level topology unit (if any) and the system. For different three-level topology units, the short-circuit current levels are I F31 , I F32 If there exists a F3x CB If it does not exist, there is no applicable solution;

[0119] (3) System impact analysis:

[0120] For the alternative solutions that meet the requirements above, calculate the impact of the basic topology unit circuit breaker disconnection operation on system power flow, stability, and overvoltage under normal system operation and system fault conditions. Eliminate the solutions with greater impact from the alternative solutions; if the impact is significant across all solutions, then no solution is applicable.

[0121] (4) Feasibility and economic analysis of layout implementation:

[0122] For the remaining alternatives from the previous step, analyze their feasibility based on the substation layout and eliminate infeasible options. If all options are infeasible, then there is no applicable option.

[0123] For feasible alternative plans, analyze the economic feasibility of implementation and select the most economical plan as the final layout plan.

[0124] (5) Key parameters and action strategies of fast circuit breakers:

[0125] a. After determining the layout of the fast circuit breaker, determine key parameters such as the breaking capacity and breaking time of the fast circuit breaker based on the characteristics of the substation's short-circuit current exceeding the standard and the parameters of conventional circuit breakers.

[0126] According to the method in (1), a simulation model is established to simulate the maximum current flowing through the fast circuit breaker under different fault conditions and determine the maximum breaking current of the fast circuit breaker.

[0127] ​​(1) Obtain the circuit breaker parameters when the short-circuit current exceeds the standard, including the mechanical tripping time. The tripping time of the configured fast circuit breaker should be less than the minimum tripping time of the conventional circuit breaker of the original substation, with a certain margin.

[0128] b. After determining the layout of the fast circuit breaker, the fast circuit breaker action strategy is as follows:

[0129] During normal operation, the system is in a fully wired state and the isolation topology unit is connected to the system.

[0130] When a fault occurs, after rapid fault detection, the fast circuit breaker is commanded to open, disconnecting the selected topology unit that needs to be isolated from the rest of the system, reducing the short-circuit current after the fault; then the relay protection device operates normally to cut off the fault.

[0131] After the fault is cleared, the fast circuit breaker is commanded to reclose and the isolated topology unit is reconnected to the system.

[0132] This invention establishes a refined calculation model for station equipment that takes into account wiring topology, as well as a calculation model that reflects the operating characteristics of protection and circuit breakers. This model captures the transient characteristics of short-circuit currents actually experienced by equipment during system faults. This allows for refined analysis and verification of short-circuit currents based on different fault types and equipment short-circuit current tolerance characteristics, providing a technical basis for further identifying mitigation measures.

[0133] Figure 4 A best practice application example is provided. Taking a 3 / 2 substation wiring configuration as an example, fast-acting circuit breakers are deployed on both circuit breakers on branch L5. Under normal operation, the system is fully wired. In the event of a busbar fault, the fast-acting circuit breakers on both sides of the L5 branch topology unit open first, reducing the short-circuit current at the fault point. The system then opens normally. Figure 5 The short-circuit current suppression effect is given.

[0134] Example 2:

[0135] The present invention also proposes a circuit breaker configuration system 200 for suppressing short-circuit current in a power grid, such as Figure 6 Shown, including:

[0136] A simulation unit 201 is configured to obtain topology data of a target power system and substation, establish a topology model of the target power system and substation based on the topology data, and determine short-circuit current characteristics of the target power system and substation based on the topology model;

[0137] A selection unit 202 is configured to preliminarily select an alternative arrangement from all arrangements of circuit breakers based on the short-circuit current characteristics, determine the system impact of the alternative arrangement on the target power system and substation, and eliminate the alternative arrangement with a large system impact to obtain a target alternative arrangement;

[0138] The configuration unit 203 is configured to determine the feasibility and economy of the target alternative layout methods, select the target alternative layout method with the best feasibility and the best economy as the final target layout method, and determine the key parameters and action strategy of the circuit breaker under the final target layout method, and configure the circuit breaker with the key parameters and action strategy, the final target layout method, the key parameters and the action strategy.

[0139] The simulation unit 201 determines the short-circuit current characteristics of the target power system and substation based on the topology model, including:

[0140] Determining a wiring method of a substation and an actual wiring arrangement of equipment in the substation based on the topology model, and establishing a simulation model based on wiring impedance in the substation according to the baseline method and the actual wiring arrangement;

[0141] According to the operation mode of the power grid, a power grid operation model is established using an equivalent simplified modeling method;

[0142] Establish an action characteristic model based on the action characteristics of protection and circuit breakers in the substation;

[0143] Based on the simulation model, the power grid operation model and the action characteristic model, an electromagnetic transient simulation model for simulating the circuit breaker breaking current is established;

[0144] The breaking current of the circuit breaker is simulated using the electromagnetic transient simulation model to obtain simulation data. Based on the simulation data, the transient characteristics of the circuit breaker current when a fault occurs at each node in the substation, the circuit breaker where the short-circuit current exceeds the standard fault and its location and the short-circuit current levels provided by different branches when the current exceeds the standard fault point are determined.

[0145] When establishing a simulation model based on the wiring impedance within the substation, the lines directly connected to the substation are retained, and the external equipment of the substation is simplified using the Thevenin equivalent method to simplify the external equipment into a voltage source and an equivalent impedance.

[0146] The action characteristics include at least one of the following: protection action time and circuit breaker breaking characteristics.

[0147] The selection unit 202 preliminarily selects an alternative arrangement from all arrangements of the circuit breaker based on the short-circuit current characteristics, including:

[0148] determining a topology of the power system based on the short-circuit current characteristics and classifying the topology to obtain a classification result;

[0149] Based on the classification result, defining a topological subset of the substation in a preset manner;

[0150] Determining short-circuit current suppression effects under different circuit breaker arrangements according to the topology subset;

[0151] Based on the suppression effect, an alternative arrangement is preliminarily selected from all arrangements of the circuit breaker.

[0152] The preset manner includes at least one of the following: definition in a basic topology unit manner, definition in a secondary topology unit manner, and definition in a tertiary topology unit manner.

[0153] Among them, based on the suppression effect, an alternative arrangement is initially selected from all arrangements of the circuit breaker, including:

[0154] Under different preset modes, the short-circuit current suppression levels under different arrangements of the circuit breaker are determined, and the arrangement corresponding to the short-circuit current suppression level that meets the preset requirements is used as an alternative arrangement.

[0155] The selection unit 202 determines the system impact of the alternative arrangement on the target power system and substation, including:

[0156] Calculate the impact of circuit breaker disconnection operations on power system power flow, stability, and overvoltage under various alternative layouts during normal and faulty operation of the power system.

[0157] Among them, the key parameters include: the maximum breaking current of the circuit breaker and the circuit breaker parameters when the short-circuit current exceeds the standard.

[0158] Among them, the action strategy includes:

[0159] During normal operation, the isolation topology unit is connected to the power system;

[0160] When a fault occurs, the circuit breaker is commanded to open, disconnecting the isolation topology unit from the power system, reducing the short-circuit current after the fault, and allowing the relay protection device to operate normally to eliminate the fault;

[0161] After the fault is cleared, the circuit breaker is commanded to reclose and the isolated topology unit is reconnected to the power system.

[0162] The present invention provides technical support for suppressing short-circuit current in a power grid.

[0163] Example 3:

[0164] Based on the same inventive concept, the present invention also provides a computer device, which includes a processor and a memory, wherein the memory is used to store a computer program, the computer program includes program instructions, and the processor is used to execute the program instructions stored in the computer storage medium. The processor may be a central processing unit (CPU), or may be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, which is suitable for implementing one or more instructions, specifically suitable for loading and executing one or more instructions in the computer storage medium to implement the corresponding method flow or corresponding function, so as to implement the steps of the method in the above embodiment.

[0165] Example 4:

[0166] Based on the same inventive concept, the present invention also provides a storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device for storing programs and data. It can be understood that the computer-readable storage medium here can include both built-in storage media in the computer device and, of course, extended storage media supported by the computer device. The computer-readable storage medium provides a storage space that stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by the processor are also stored in the storage space. These instructions can be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the steps of the method in the above embodiment.

[0167] It will be understood by those skilled in the art that the embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may 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 the present invention may be implemented in various computer languages, for example, the object-oriented programming language Java and the interpreted scripting language JavaScript.

[0168] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts 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, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0169] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0170] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0171] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0172] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A circuit breaker configuration method for suppressing short-circuit current in a power grid, characterized in that: The circuit breaker configuration method includes: Acquiring topological data of a target power system and substation, establishing a topological model of the target power system and substation based on the topological data, and determining short-circuit current characteristics of the target power system and substation based on the topological model; Based on the short-circuit current characteristics, preliminarily selecting alternative layouts from all layouts of circuit breakers, determining the system impacts of the alternative layouts on the target power system and substation, and eliminating alternative layouts with large system impacts to obtain a target alternative layout; Determining the feasibility and economy of the target alternative layouts, selecting the target alternative layout with the best feasibility and economy as the final target layout, and determining key parameters and an action strategy of the circuit breaker under the final target layout, and configuring the circuit breaker with the key parameters and action strategy, the final target layout, the key parameters, and the action strategy; The preliminarily selecting an alternative arrangement from all arrangements of the circuit breaker based on the short-circuit current characteristics includes: determining a topology of the power system based on the short-circuit current characteristics and classifying the topology to obtain a classification result; Based on the classification result, defining a topological subset of the substation in a preset manner; Determining short-circuit current suppression effects under different circuit breaker arrangements according to the topology subset; Preliminarily selecting an alternative arrangement from all arrangements of the circuit breaker based on the suppression effect; The preset manner includes at least one of the following: defining in a basic topological unit manner, defining in a secondary topological unit manner, and defining in a tertiary topological unit manner; The method of preliminarily selecting an alternative arrangement from all arrangements of the circuit breaker based on the suppression effect includes: Under different preset modes, the short-circuit current suppression levels under different arrangements of the circuit breaker are determined, and the arrangement corresponding to the short-circuit current suppression level that meets the preset requirements is used as an alternative arrangement.

2. The circuit breaker configuration method according to claim 1, characterized in that: The determining, based on the topology model, short-circuit current characteristics of the target power system and substation includes: Determining a wiring method of a substation and an actual wiring arrangement of equipment in the substation based on the topology model, and establishing a simulation model based on wiring impedance in the substation according to a baseline method and the actual wiring arrangement; According to the operation mode of the power grid, a power grid operation model is established using an equivalent simplified modeling method; Establish an action characteristic model based on the action characteristics of protection and circuit breakers in the substation; Based on the simulation model, the power grid operation model and the action characteristic model, an electromagnetic transient simulation model for simulating the circuit breaker breaking current is established; The breaking current of the circuit breaker is simulated using the electromagnetic transient simulation model to obtain simulation data. Based on the simulation data, the transient characteristics of the circuit breaker current when a fault occurs at each node in the substation, the circuit breaker where the short-circuit current exceeds the standard fault and its location and the short-circuit current levels provided by different branches when the current exceeds the standard fault point are determined.

3. The circuit breaker configuration method according to claim 2, characterized in that: When establishing the simulation model based on the wiring impedance within the substation, the lines directly connected to the substation are retained, and the external equipment of the substation is simplified using the Thevenin equivalent method to simplify the external equipment into a voltage source and an equivalent impedance.

4. The circuit breaker configuration method according to claim 2, characterized in that: The action characteristics include at least one of the following: protection action time and circuit breaker breaking characteristics.

5. The circuit breaker configuration method according to claim 1, characterized in that: Determining the system impact of the alternative arrangement on the target power system and substation includes: Calculate the impact of circuit breaker disconnection operations on power system power flow, stability, and overvoltage under various alternative layouts during normal and faulty operation of the power system.

6. The circuit breaker configuration method according to claim 1, characterized in that: The key parameters include: the maximum breaking current of the circuit breaker and the circuit breaker parameters when the short-circuit current exceeds the standard.

7. The circuit breaker configuration method according to claim 1, characterized in that: The action strategy includes: During normal operation, the isolation topology unit is connected to the power system; When a fault occurs, the circuit breaker is commanded to open, disconnecting the isolation topology unit from the power system, reducing the short-circuit current after the fault, and allowing the relay protection device to operate normally to eliminate the fault; After the fault is cleared, the circuit breaker is commanded to reclose and the isolated topology unit is reconnected to the power system.

8. A circuit breaker configuration system for suppressing short-circuit current in a power grid, characterized in that: The circuit breaker configuration system comprises: a simulation unit, configured to obtain topological data of a target power system and substation, establish a topological model of the target power system and substation based on the topological data, and determine short-circuit current characteristics of the target power system and substation based on the topological model; a selection unit configured to preliminarily select an alternative arrangement from all arrangements of circuit breakers based on the short-circuit current characteristics, determine the system impact of the alternative arrangement on the target power system and substation, and eliminate the alternative arrangement with a large system impact to obtain a target alternative arrangement; a configuration unit, configured to determine the feasibility and economy of the target alternative layout modes, select the target alternative layout mode with the best feasibility and the best economy as the final target layout mode, determine the key parameters and action strategy of the circuit breaker under the final target layout mode, and configure the circuit breaker with the key parameters and action strategy, the final target layout mode, the key parameters and the action strategy; The selection unit preliminarily selects an alternative arrangement from all arrangements of the circuit breaker based on the short-circuit current characteristics, including: determining a topology of the power system based on the short-circuit current characteristics and classifying the topology to obtain a classification result; Based on the classification result, defining a topological subset of the substation in a preset manner; Determining short-circuit current suppression effects under different circuit breaker arrangements according to the topology subset; Preliminarily selecting an alternative arrangement from all arrangements of the circuit breaker based on the suppression effect; The preset manner includes at least one of the following: defining in a basic topological unit manner, defining in a secondary topological unit manner, and defining in a tertiary topological unit manner; The method of preliminarily selecting an alternative arrangement from all arrangements of the circuit breaker based on the suppression effect includes: Under different preset modes, the short-circuit current suppression levels under different arrangements of the circuit breaker are determined, and the arrangement corresponding to the short-circuit current suppression level that meets the preset requirements is used as an alternative arrangement.

9. The circuit breaker configuration system according to claim 8, characterized in that: The simulation unit determines short-circuit current characteristics of the target power system and substation based on the topology model, including: Determining a wiring method of a substation and an actual wiring arrangement of equipment in the substation based on the topology model, and establishing a simulation model based on wiring impedance in the substation according to a baseline method and the actual wiring arrangement; According to the operation mode of the power grid, a power grid operation model is established using an equivalent simplified modeling method; Establish an action characteristic model based on the action characteristics of protection and circuit breakers in the substation; Based on the simulation model, the power grid operation model and the action characteristic model, an electromagnetic transient simulation model for simulating the circuit breaker breaking current is established; The breaking current of the circuit breaker is simulated using the electromagnetic transient simulation model to obtain simulation data. Based on the simulation data, the transient characteristics of the circuit breaker current when a fault occurs at each node in the substation, the circuit breaker where the short-circuit current exceeds the standard fault and its location and the short-circuit current levels provided by different branches when the current exceeds the standard fault point are determined.

10. The circuit breaker configuration system according to claim 9, characterized in that: When establishing the simulation model based on the wiring impedance within the substation, the lines directly connected to the substation are retained, and the external equipment of the substation is simplified using the Thevenin equivalent method to simplify the external equipment into a voltage source and an equivalent impedance.

11. The circuit breaker configuration system according to claim 9, wherein: The action characteristics include at least one of the following: protection action time and circuit breaker breaking characteristics.

12. The circuit breaker configuration system according to claim 8, wherein: The selection unit determines the system impact of the alternative arrangement on the target power system and substation, including: Calculate the impact of circuit breaker disconnection operations on power system power flow, stability, and overvoltage under various alternative layouts during normal and faulty operation of the power system.

13. The circuit breaker configuration method according to claim 8, characterized in that: The key parameters include: the maximum breaking current of the circuit breaker and the circuit breaker parameters when the short-circuit current exceeds the standard.

14. The circuit breaker configuration method according to claim 8, characterized in that: The action strategy includes: During normal operation, the isolation topology unit is connected to the power system; When a fault occurs, the circuit breaker is commanded to open, disconnecting the isolation topology unit from the power system, reducing the short-circuit current after the fault, and allowing the relay protection device to operate normally to eliminate the fault; After the fault is cleared, the circuit breaker is commanded to reclose and the isolated topology unit is reconnected to the power system.

15. A computer device, characterized in that: include: one or more processors; a processor for executing one or more programs; When the one or more programs are executed by the one or more processors, the method according to any one of claims 1 to 7 is implemented.

16. A computer-readable storage medium, characterized in that A computer program is stored thereon, and when the computer program is executed, the method according to any one of claims 1 to 7 is implemented.

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