A resource sharing type dual master station stability control system design method for bridge type architecture power grid

Abstract

The application discloses a resource sharing type double master station stability control system design method for a bridge type architecture power grid, which is characterized in that, for the bridge type architecture power grid, one stability control system master station is arranged on each side of the bridge, and a plurality of sub-stations are distributed under each master station; the master stations share the controllable resource information of the regional power grid; and the sub-stations communicate with the master stations or the sub-stations on the opposite side without crossing the bridge. The method further takes the operation state of the bridge tie line as a benchmark, automatically classifies and distinguishes the power grid operation mode, dynamically matches the power flow section according to the fault condition of different lines, and automatically selects the control resource and formulates the control strategy quantity. The method of the application illustrates that, when the bridge tie line is in operation, the control resource in the entire regional power grid can be selected as the control object, and only the control resource on the side of the bridge is selected to take control measures after the bridge tie line is interrupted. The application can solve the system problem in the form of accurate removal with minimum overcutting when the power grid is faulty.

Description

Technical Field

[0001] This invention belongs to the field of power system and its automation technology, and more precisely, it relates to a design method for a resource-sharing dual-master station stability control system for bridge-type power grids. Background Technology

[0002] A regional stability control system refers to a system consisting of safety and stability control devices installed at two or more power plants to address the stability issues of a regional power grid, interconnected through information channels and communication interface equipment. A typical regional stability control system comprises a master station, several substations, and several terminal stations.

[0003] When the local power transmission or receiving grid structure is a bridge type or a triangular ring type, the conventional stability control system design method cannot accurately select the fault section and accurately formulate the control measures. This may lead to excessive action measures of the stability control system, resulting in power imbalance and causing large fluctuations in grid frequency. The negative effects are more obvious, especially in relatively small asynchronous grids. Summary of the Invention

[0004] The purpose of this invention is to provide a design method for a resource-sharing dual-master station stability control system for bridge-type power grids. This method can optimize the stability control system architecture design, accurately identify the power grid operation mode and match fault reference sections, and accurately select control resources to compensate for the shortcomings of existing stability control systems when dealing with bridge-type power grid architectures.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] This invention provides a design method for a resource-sharing dual-master station stability control system for bridge-type power grids, comprising:

[0007] A power grid model with a bridge-type architecture is constructed, as well as a resource-sharing dual-master station stability control system with a bridge-type architecture. Among them, the architecture of local power transmission or receiving power grids that is bridge-type or triangular ring-type is a bridge-type architecture.

[0008] Based on the power grid model, the tie line parameters between the two master stations are obtained, and the operation mode of the bridge-type power grid is identified based on the tie line parameters, which is the power grid operation mode before the fault.

[0009] Based on the power grid operation mode before the fault and the fault section of the line fault;

[0010] Select control resources and formulate control strategies for the matched fault sections.

[0011] Furthermore, the resource-sharing dual-master station stability control system with a bridge-type architecture includes:

[0012] A main station is set up on each side of the power grid bridge, and several substations are distributed under each main station. The substations only communicate with the main station on their respective side. The two main stations establish a communication link through a tie line to share the regional power grid line operation status and controllable resource information.

[0013] Furthermore, the power grid model for constructing the bridge-type architecture includes:

[0014] For a bridge-type power grid, substation models of lower-level stations and hub stations are established to obtain the substation's position in the power grid and the tie line parameters between substations; the tie line parameters include electrical quantities and switching quantities.

[0015] Furthermore, the method of identifying the bridge-type power grid operation mode based on tie-line parameters includes:

[0016] Determine the operating status of the receiving and sending lines of the two master stations and the connecting line between the two master stations; the operating status includes being in operation, being out of operation, and being tripped;

[0017] Based on the operating status, the bridge-type power grid operation mode is identified into three categories: multi-circuit tie line operation, single-circuit tie line operation, and tie line outage.

[0018] Furthermore, the fault section matching based on the pre-fault power grid operation mode and line fault includes:

[0019] Distinguish between bridge and non-bridge line faults;

[0020] If only non-bridge line faults occur, the total transmission section of the regional power grid is selected as the fault section.

[0021] If only a bridge line fault occurs, or if a non-bridge line fault occurs and all bridge lines trip, then each independent section of the hub substation in its sending or receiving direction shall be selected as the fault section.

[0022] Furthermore, the step of selecting control resources and formulating control strategy quantities for the matched fault section includes:

[0023] For the regional power grid's total transmission section used as the fault section, the control resources are all controllable resources within the regional power grid.

[0024] For the independent cross-sections of the hub substation in the sending or receiving direction, which are considered as fault sections, the controllable resources are the controllable resources under the jurisdiction of the main station on this side of the bridge.

[0025] Furthermore, the step of selecting control resources and formulating control strategy quantities for the matched fault section includes:

[0026] For the total transmission section of the regional power grid as the fault section, the calculated control measures are as follows:

[0027] PcutB = PsectionB – PRBn;

[0028] Wherein, PcutB is the control measure quantity after the fault of the total cross section of the regional power grid, PsectionB is the power flow value of the total cross section of the regional power grid, PRBn is the reserved capacity value of the nth segment of the total cross section of the regional power grid, n is the preset segment, and the reserved capacity value is the preset value.

[0029] For the fault section using an independent cross-section in either the sending or receiving direction of the hub substation, the calculated control measures are as follows:

[0030] PcutS = PsectionS – PRSm;

[0031] Wherein, PcutS is the control measure quantity after a fault in an independent section in the sending or receiving direction of the hub substation, PsectionS is the power flow value of the independent section in the sending or receiving direction of the hub substation, PRSn is the reserved capacity value of the m-th section of the independent section in the sending or receiving direction of the hub substation, and m is the preset section.

[0032] Furthermore, the values ​​of n and m range from 1 to 6.

[0033] Furthermore, the matching of fault sections based on the pre-fault power grid operation mode and line faults specifically includes:

[0034] For multiple circuits of the tie line before the fault, if it is any one of the following situations: non-bridge line N-1 or N-2 fault, non-bridge line N-1 fault + bridge line N-1 fault, or non-bridge line N-2 fault + bridge line N-1 fault, then the total transmission section of the regional power grid is used as the fault section; if it is any one of the following situations: bridge line N-1 or N-2 fault, or bridge line N-2 fault + non-bridge line N-1 fault, then the independent section of the hub substation in the transmission or reception direction is used as the fault section.

[0035] For single-circuit operation of the tie line before the fault, if the fault is a non-bridge line N-1 or N-2 fault, the total transmission section of the regional power grid is used as the fault section; if it is any one of the following: bridge line N-1 fault, bridge line N-1 fault + non-bridge line N-1 fault, or bridge line N-1 fault + non-bridge line N-2 fault, the independent section of the hub substation in the transmission or reception direction is used as the fault section.

[0036] For the connection line out of service before the fault, for non-bridge lines N-1 or N-2 after the fault, the independent section of the hub substation in the sending or receiving direction is used as the fault section.

[0037] The beneficial effects of this invention are as follows:

[0038] This invention provides a design method for a resource-sharing dual-master station stability control system for bridge-type power grids. The method sets up a master station on each side of the bridge in the bridge-type power grid, and the two master stations share information on line operation status and control resources. The method can accurately identify the power grid operation mode and match the fault reference section, accurately select control resources and calculate control measures in stages, and solve system problems with minimal overcutting and precise disconnection when the power grid fails. Attached Figure Description

[0039] Figure 1 This is a diagram of a bridge-type space frame structure provided in Embodiment 2 of the present invention;

[0040] Figure 2 This is a diagram of the bridge-type power grid stability control system architecture provided in Embodiment 2 of the present invention;

[0041] Figure 3 This is a schematic diagram of the design method for a stability control system based on a power grid bridge architecture provided in Embodiment 2 of the present invention. Detailed Implementation

[0042] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The following embodiments are merely descriptive and not limiting, and should not be used to limit the scope of protection of the present invention.

[0043] In order to achieve the purpose and effect of the technical means, creative features, workflow and usage method of the present invention, and to make the evaluation method easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0044] Example 1

[0045] This embodiment provides a design method for a resource-sharing dual-master station stability control system for bridge-type power grids, including:

[0046] A power grid model with a bridge-type architecture is constructed, and a resource-sharing dual-master station stability control system with the bridge-type architecture is built; the resource-sharing dual-master station stability control system with the bridge-type architecture consists of setting up one master station on each side of the power grid bridge;

[0047] Based on the power grid model, the tie line parameters between the two master stations are obtained, and the operation mode of the bridge-type power grid is identified based on the tie line parameters, which is the power grid operation mode before the fault.

[0048] Based on the power grid operation mode before the fault and the fault section of the line fault;

[0049] Select control resources and formulate control strategies for the matched fault sections.

[0050] It should be noted that the local power transmission or receiving grid structure is a bridge-type or triangular ring-type structure, which is a bridge-type structure. It is achieved by converging through two hub substations, and the two hub substations are connected by a tie line.

[0051] In this embodiment, a master station is set up on each side of the power grid bridge. The two master stations share information on line operation status and control resources. Based on this, the power grid safety and stability control system with bridge architecture can not only take overall control measures when the power grid bridge connection line is running, but also independently solve the safety and stability problems of regional power grid transmission when the power grid bridge is interrupted.

[0052] In this embodiment, the bridge-type power grid model is constructed by establishing substation models for lower-level stations and hub stations, and obtaining the substations' positions in the power grid and the tie-line parameters between substations. These tie-line parameters include electrical quantities and switching quantities.

[0053] In this embodiment, the operation mode of the bridge-type power grid is identified based on the power grid model. Specifically, the implementation method is as follows:

[0054] The operating status of the receiving and sending lines of the two hub substations and the connecting lines between the two hub substations is determined based on the obtained parameters of the tie lines between the substations; the operating status includes commissioning, shutdown, and tripping.

[0055] Based on the operating status of the tie lines, the operation modes of the bridge-type power grid are identified into three categories: multi-circuit tie line operation, single-circuit tie line operation, and tie line outage.

[0056] It should be noted that the first type of tie line is in multi-circuit operation, which means that the electrical connection between the two hub substations is close and the control measures are relatively relaxed; the second type of tie line is in single-circuit operation, which means that the electrical connection between the two hub substations is relatively reduced and the control measures are more stringent; the third type of tie line is out of service, which means that the two hub substations have no electrical connection and are controlled independently.

[0057] In this embodiment, based on the power grid operation mode before the fault and the fault section matching of the line fault, the specific implementation process is as follows:

[0058] Distinguish between bridge and non-bridge line faults;

[0059] When the connecting line between two hub substations is in operation, if only a non-bridge line fault occurs, the total cross section of the regional power grid transmission line shall be selected as the fault section.

[0060] If only a bridge line fault occurs, or if a non-bridge line fault occurs and all bridge lines trip, then each independent section of the hub substation in its sending or receiving direction shall be selected as the fault section.

[0061] In this embodiment, control resources are selected and control strategy quantities are formulated for the matched fault sections. The specific implementation process is as follows:

[0062] Based on the operating status of the bridge tie line before and during the fault, when a line fault trips in the regional power grid, the control resources of the entire regional power grid can be selected as the control objects and the control measures can be calculated when the bridge tie line is running; after the bridge tie line is interrupted, only the control resources on the bridge side are selected as the control objects and the control measures can be calculated.

[0063] Example 2

[0064] This embodiment adopts the design method of the resource-sharing dual-master station stability control system for bridge-type power grids in Embodiment 1. Figure 1 The bridge-type power grid shown is subjected to safe and stable control. The specific implementation process is as follows:

[0065] like Figure 1 The bridge-type power grid shown has stations M and N as hub substations, connected to the upstream station P. Each station has several power sources or loads distributed at its lower level. Stations M and N are connected by a line; in this embodiment, the connecting line between stations M and N is defined as a "bridge." Research indicates that similar architectures exist in domestic power grids, with slight structural differences. Some have different upstream substations for stations M and N, while others have power sources or loads distributed on only one side of stations M and N. All of these can be considered as control objects in this embodiment of the invention.

[0066] Based on the inventive concept of Embodiment 1, a master station is set up on each side of the power grid bridge, such as... Figure 2 As shown, a master station M is set up on one side of the bridge connecting line, with substations M1 to Mx distributed; a master station N is set up on the other side of the bridge connecting line, with substations N1 to Ny distributed. Each substation communicates only with its corresponding master station. The two master stations establish a communication link through the connecting line, sharing information on the regional power grid line operation status and controllable resources. Based on this, a resource-sharing dual-master station stability control system is constructed.

[0067] Based on the inventive concept of Embodiment 1 and Figure 2 This embodiment provides a design method for a resource-sharing dual-master station stability control system based on a power grid bridge architecture. (See [link to relevant documentation]). Figure 3 This includes the following steps:

[0068] S1. Define the power grid operation mode based on the commissioning and shutdown status of power grid bridge interconnection lines;

[0069] S2. Identify faulty components, that is, distinguish between bridge and non-bridge line faults;

[0070] S3. Based on the power grid operation mode and line fault matching fault sections, and after looking up the control strategy table, the control measures are obtained.

[0071] For non-bridge line faults, the substations under the main station are sorted according to control resources, and control instructions for each substation are obtained by combining control measures.

[0072] For bridge line faults, the substations under the main station on this side are sorted according to control resources, and control instructions for each substation are obtained by combining control measures.

[0073] It should be noted that if the bridge is interrupted during a fault, no control commands will be sent to the main station on the opposite side of the bridge.

[0074] In this embodiment, the power grid operation mode is classified according to the commissioning and shutdown status of the power grid bridge connecting lines. Taking a power grid bridge consisting of two circuits as an example, the power grid operation modes are shown in Table 1.

[0075] Table 1. Identification of Power Grid Operation Modes in the Stability Control System Based on Power Grid Bridge Architecture

[0076]

[0077] 1) When the bridge line is running in double-circuit mode, the arrangement and combination of non-bridge lines during operation will automatically form a Class I operation mode;

[0078] 2) When a bridge line is in operation, the arrangement and combination of non-bridge lines during operation will automatically form a Class II operation mode.

[0079] 3) When both circuits of the bridge line are out of service, the combination of non-bridge lines being put into and taken out will automatically form a Class III operation mode.

[0080] It should be noted that the non-bridge line arrangement combination is any combination of the operation and discontinuation of Line 1 and Line 2, and each combination is a sub-mode.

[0081] In this embodiment, when a line fault trips, the control measures are determined by distinguishing between bridge and non-bridge line faults and by consulting the control strategy table, as shown in Table 2.

[0082] Table 2 Control Strategies for Stability Control System Based on Power Grid Bridge Architecture

[0083]

[0084] In the table above, the control measures for non-bridge line faults are calculated as follows:

[0085] PcutB=PsectionB–PRBn(n=1~6) (1)

[0086] In the formula: PcutB is the control measure quantity of the fault section after a non-bridge line fault. The fault section after a non-bridge line fault, i.e., the total transmission section of the regional power grid, is defined as the large section. PsectionB is the power flow value of the large section, and PRBn is the reserved capacity value of the nth segment of the large section.

[0087] The formula for calculating the amount of control measures after a bridge track failure is as follows:

[0088] PcutS = PsectionS– PRSn (m=1~6) (2)

[0089] In the formula: PcutS is the control measure quantity of the fault section after the bridge line fault. The fault section after the bridge line fault, that is, the independent section of the hub substation in the direction of sending or receiving, is defined as the small section. PsectionS is the power flow value of the small section, and PRSm is the reserved capacity value of the m-th segment of the small section.

[0090] It should be noted that the reserved capacity value is a strategy setting, pre-set in the stability control device; six levels are set based on engineering experience, and can be added or removed if needed. The level is set according to actual needs, and the cross-sectional threshold is also pre-set in the stability control device. One level corresponds to one cross-sectional threshold and one reserved capacity value. Horizontally, control is tiered according to the cross-sectional threshold.

[0091] It should be further noted that, due to the different operating modes of the power grid before the fault, the selected cross-sections and control resource ranges also differ after a fault occurs on different lines. Specifically, the principles shown in Table 3 are followed as follows:

[0092] 1) The double-circuit operation mode of the bridge line before the fault, and the principles for selecting the cross section and control resources after the line fault.

[0093] ① For cases involving only non-bridge line N-1 or N-2 faults, non-bridge line N-1 fault + bridge line N-1 fault, or non-bridge line N-2 fault + bridge line N-1 fault, the cross-section is determined by the sum of the power of the large cross-section (M station line + N station line). The specific control measures are calculated based on the values ​​in the control strategy table. The control resources are all controllable resources within the regional power grid. The control resources are divided into loads and power sources. If the region is an external power transmission area, the control resources are power sources; if the region is an incoming power transmission area, the control resources are loads.

[0094] ② For cases involving only bridge line faults N-1 or N-2, or bridge line fault N-2 plus non-bridge line fault N-1, a small cross-section (M / N station line + bridge cross-section) is used for judgment. The specific control measures are determined by combining the values ​​in the control strategy table. The control resources are the controllable resources under the jurisdiction of the main station on the bridge side.

[0095] 2) The single-circuit operation mode of the bridge line before the fault, and the principles for selecting the cross-section and control resources after the line fault.

[0096] ① For cases where only non-bridge line faults N-1 or N-2 occur, the cross-section is judged by the sum of the power of the large cross-section (M station line + N station line), and the specific control measures are determined by combining the values ​​in the control strategy table. The control resources are all controllable resources within the regional power grid.

[0097] ② For cases involving only bridge line N-1 fault, bridge line N-1 fault + non-bridge line N-1 fault, or bridge line N-1 fault + non-bridge line N-2 fault, the cross-section is judged using a small cross-section (M / N station line + bridge cross-section). The specific control measures are determined by combining the values ​​in the control strategy table. The control resources are the controllable resources under the jurisdiction of the main station on the bridge side.

[0098] 3) The double-circuit shutdown method of the bridge line before the fault, and the principles for selecting the cross section and control resources after the line fault.

[0099] For non-bridge lines experiencing faults N-1 or N-2, the cross-section is assessed using a small cross-section (M / N station line + bridge cross-section). Specific control measures are determined based on the control strategy table values, and the control resources are the controllable resources under the jurisdiction of the main station on the bridge side. Note that this assumes the connecting line is no longer in operation, and the two sides of the bridge are now two independent systems.

[0100] Table 3. Selection of cross-sections and control measures for stability control systems based on power grid bridge architecture.

[0101]

[0102]

[0103] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0104] Similarly, it should be understood that, in order to streamline this disclosure and aid in understanding one or more of the various aspects of the invention, in the above description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof. However, this method of disclosure should not be interpreted as reflecting an intention that the claimed invention requires more features than expressly recited in each claim. Rather, as reflected in the claims, inventive aspects lie in fewer than all features of a single foregoing disclosed embodiment. Therefore, the claims following the detailed description are hereby expressly incorporated into that detailed description, wherein each claim itself is a separate embodiment of the invention.

[0105] Those skilled in the art will understand that the modules, units, or groups of devices in the examples disclosed herein can be arranged in the device as described in this embodiment, or alternatively, can be located in one or more devices different from the device in this example. The modules in the foregoing examples can be combined into a single module or, in addition, can be divided into multiple sub-modules.

[0106] Those skilled in the art will understand that modules in the device of the embodiments can be adaptively changed and placed in one or more devices different from that embodiment. Modules, units, or groups in the embodiments can be combined into a single module, unit, or group, and further, they can be divided into multiple sub-modules, sub-units, or sub-groups. Except where at least some of such features and / or processes or units are mutually exclusive, any combination can be used to combine all features disclosed in this specification (including the accompanying claims, abstract, and drawings) and all processes or units of any method or device so disclosed. Unless expressly stated otherwise, each feature disclosed in this specification (including the accompanying claims, abstract, and drawings) may be replaced by an alternative feature that serves the same, equivalent, or similar purpose.

[0107] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features but not others included in other embodiments, combinations of features from different embodiments are intended to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments can be used in any combination.

[0108] As used herein, unless otherwise specified, the use of ordinal numbers such as “first,” “second,” “third,” etc., to describe ordinary objects merely indicates different instances of similar objects and is not intended to imply that the objects being described must have a given order in time, space, ordering, or any other manner.

[0109] Although the invention has been described with reference to a limited number of embodiments, those skilled in the art will understand from the foregoing description that other embodiments are conceivable within the scope of the invention described herein. Furthermore, it should be noted that the language used in this specification has been chosen primarily for readability and edibility purposes, and not for the purpose of interpreting or limiting the subject matter of the invention. Therefore, many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the appended claims. The disclosure of the invention is illustrative and not restrictive, and the scope of the invention is defined by the appended claims.

Claims

1. A design method for a resource-sharing dual-master station stability control system for bridge-type power grids, characterized in that, include: A power grid model with a bridge-type architecture is constructed, as well as a resource-sharing dual-master station stability control system with a bridge-type architecture. Among them, the architecture of local power transmission or receiving power grids that is bridge-type or triangular ring-type is a bridge-type architecture. Based on the power grid model, the tie line parameters between the two master stations are obtained, and the operation mode of the bridge-type power grid is identified based on the tie line parameters, which is the power grid operation mode before the fault. Based on the power grid operation mode before the fault and the fault section matching of the line fault, including: distinguishing between bridge or non-bridge line faults; if only non-bridge line faults occur, the total transmission section of the regional power grid is selected as the fault section; if only bridge line faults occur, or if non-bridge line faults occur and all bridge lines trip, the independent section of the hub substation in the transmission or reception direction is selected as the fault section. Select control resources and formulate control strategies for the matched fault sections.

2. The design method for a resource-sharing dual-master station stability control system for a bridge-type power grid according to claim 1, characterized in that, The resource-sharing dual-master station stability control system with a bridge-type architecture includes: A main station is set up on each side of the power grid bridge, and several substations are distributed under each main station. The substations only communicate with the main station on their respective side. The two main stations establish a communication link through a tie line to share the regional power grid line operation status and controllable resource information.

3. The design method for a resource-sharing dual-master station stability control system for bridge-type power grids according to claim 1, characterized in that, The power grid model for constructing a bridge-type architecture includes: For a bridge-type power grid, substation models of lower-level stations and hub stations are established to obtain the substation's position in the power grid and the tie line parameters between substations; the tie line parameters include electrical quantities and switching quantities.

4. The design method for a resource-sharing dual-master station stability control system for bridge-type power grids according to claim 2, characterized in that, The method for identifying the operation mode of a bridge-type power grid based on tie-line parameters includes: Determine the operating status of the receiving and sending lines of the two master stations and the connecting line between the two master stations; the operating status includes being in operation, being out of operation, and being tripped; Based on the operating status, the bridge-type power grid operation mode is identified into three categories: multi-circuit tie line operation, single-circuit tie line operation, and tie line outage.

5. The design method for a resource-sharing dual-master station stability control system for a bridge-type power grid according to claim 4, characterized in that, The process of selecting control resources and formulating control strategies for the matched fault sections includes: For the regional power grid's total transmission section used as the fault section, the control resources are all controllable resources within the regional power grid. For the independent cross-sections of the hub substation in the sending or receiving direction, which are considered as fault sections, the controllable resources are the controllable resources under the jurisdiction of the main station on this side of the bridge.

6. The design method for a resource-sharing dual-master station stability control system for a bridge-type power grid according to claim 5, characterized in that, The process of selecting control resources and formulating control strategies for the matched fault sections includes: For the total transmission section of the regional power grid as the fault section, the calculated control measures are as follows: PcutB = PsectionB–PRBn; Wherein, PcutB is the control measure quantity after the fault of the total cross section of the regional power grid, PsectionB is the power flow value of the total cross section of the regional power grid, PRBn is the reserved capacity value of the nth segment of the total cross section of the regional power grid, n is the preset segment, and the reserved capacity value is the preset value. For the fault section using an independent cross-section in either the sending or receiving direction of the hub substation, the calculated control measures are as follows: PcutS = PsectionS – PRSm; Wherein, PcutS is the control measure quantity after a fault in an independent section in the direction of transmission or reception of the hub substation, PsectionS is the power flow value of the independent section in the direction of transmission or reception of the hub substation, PRSm is the reserved capacity value of the m-th section of the independent section in the direction of transmission or reception of the hub substation, and m is the preset section.

7. The design method for a resource-sharing dual-master station stability control system for a bridge-type power grid according to claim 6, characterized in that, The values ​​of n and m range from 1 to 6.

8. The design method for a resource-sharing dual-master station stability control system for bridge-type power grids according to claim 4, characterized in that, The fault section matching based on the pre-fault power grid operation mode and line faults specifically includes: For the operation mode of multiple connecting lines before the fault, if it is any one of the following: fault only in non-bridge line N-1 or N-2, fault in non-bridge line N-1 + fault in bridge line N-1, or fault in non-bridge line N-2 + fault in bridge line N-1, then the total transmission section of the regional power grid is used as the fault section; if it is any one of the following: fault only in bridge line N-1 or N-2, or fault in bridge line N-2 + fault in non-bridge line N-1, then the independent section in the transmission or reception direction of the hub substation is used as the fault section. For single-circuit operation of the tie line before the fault, if the fault is only in non-bridge line N-1 or N-2, the total transmission section of the regional power grid is used as the fault section; if the fault is only in bridge line N-1, bridge line N-1 fault + non-bridge line N-1 fault, or bridge line N-1 fault + non-bridge line N-2 fault, the independent section in the transmission or reception direction of the hub substation is used as the fault section. For the connection line out of service before the fault, for non-bridge lines N-1 or N-2 after the fault, the independent section of the hub substation in the sending or receiving direction is used as the fault section.

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