Method and system for automatically judging power-loss topology of power grid

Abstract

The invention discloses a power grid power-loss topology automatic discrimination method and a power grid power-loss topology automatic discrimination system. The method comprises the steps of firstly calculating a power grid equipment incidence relation matrix according to an end-to-end connection relation of power grid primary equipment; then judging the operation condition of the equipment according to the operation state and the electric quantity data such as voltage and current of each type of equipment; and finally, automatically judging the power loss range of the power grid based on trigger conditions such as protection action, switch displacement and accident opening, and automatically generating the power loss topology of the power grid according to the power grid equipment incidence relation matrix. According to the method, when an accident tripping event occurs in the power grid, the power-losing equipment of the whole grid can be automatically judged, and the topological association relationship among the power-losing equipment is provided, so that the power-losing range caused by accident tripping is visually displayed, the accident judgment difficulty of an operator on duty is effectively reduced, and the working efficiency is improved. And the accident reporting efficiency and accuracy of operators on duty are obviously improved.

Description

Technical Field

[0001] The present invention relates to the field of power grid control and operation and substation signal monitoring, and in particular to a method and system for acquiring power-off equipment and topological relationships thereof after a power grid accident trip. Background Art

[0002] With the rapid development of social economy, the social electricity consumption has been on the rise in recent years, which has brought about the continuous expansion of the scale of the power grid and the continuous increase of equipment in the power grid. In order to improve the power supply reliability of power users, it is necessary to identify the faulty equipment and the scope of influence as soon as possible after the power grid equipment tripping accident occurs, and restore power supply as soon as possible. Under the current monitoring mode, the power grid tripping accident depends on the monitoring and judgment of the monitoring personnel. The speed and accuracy of the judgment depends on the technical level and duty experience of the monitoring personnel. When faced with large tripping events such as busbar faults and transformer faults, the power-losing equipment usually spans multiple substations and involves different regions, which brings great difficulties to the accident judgment of the monitoring personnel. In addition, the monitoring personnel can only report the tripped equipment one by one, and it is impossible to describe its correlation and the power-losing topology of the entire network in a short time. It is difficult to assess the impact on the overall power grid, which increases the difficulty of restoring power to the power grid. Summary of the invention

[0003] Purpose of the invention: In order to quickly obtain the power-off equipment information and power-off topology after a power grid tripping event occurs, a method for automatically distinguishing the power-off equipment and its topological relationship in the power grid is proposed to solve the problem of unstable monitoring speed and accuracy caused by the inability to quickly locate the tripped equipment. The present invention also provides a power grid power-off topology automatic distinction system.

[0004] Technical solution: In the first aspect, the present invention provides a method for automatically identifying power grid power failure topology, the method comprising:

[0005] Obtaining the terminal numbers of the first and last terminals of the power grid equipment, and determining the association between the equipment according to the terminal numbers of the first and last terminals, thereby generating a power grid equipment association matrix;

[0006] The operation status of the circuit breaker, switch, busbar and transformer is obtained by combining the power grid equipment association matrix, and finally the real-time operation status of the power grid equipment is generated;

[0007] The power grid power failure topology calculation is started based on the accident tripping information, thereby obtaining the power failure equipment list and the power grid power failure topology.

[0008] Further, including:

[0009] The determining the association between devices according to the head-end and the end-end endpoint numbers, thereby generating a power grid device association matrix, includes:

[0010] Directly obtain the first and last endpoint numbers of power grid equipment from the power grid dispatching control system database;

[0011] Compare the head-end endpoint numbers and the end-end endpoint numbers of two power grid devices. If the head-end endpoint number of the current device is the same as the end-end endpoint number of another power grid device, or if the end-end endpoint number of the current device is the same as the head-end endpoint number of another power grid device, then the two power grid devices are considered to be related to each other.

[0012] Retrieve the relationship between the head end terminal number and the end end terminal number of all other devices in the power grid and the current device, so as to obtain the association relationship matrix of the current device;

[0013] Based on the association matrix of the current equipment, the association matrix of all equipment in the power grid can be calculated to obtain the power grid equipment association matrix.

[0014] Further, including:

[0015] The operation status of the circuit breaker, the switch, the busbar and the transformer is obtained by combining the power grid equipment association matrix, including:

[0016] The operation state of the corresponding circuit breaker is calculated by using the opening and closing state of the circuit breaker and the state quantity of the current flowing through the circuit breaker;

[0017] The operation state of the corresponding knife switch is calculated by using the opening and closing state of the knife switch and the state quantity of the current flowing through the knife switch;

[0018] The busbar operating status is displayed according to the three-phase voltage of the busbar;

[0019] The operating state of the transformer is determined by the operating state of the equipment associated with it. According to the power grid equipment association matrix, the association matrix after removing the transformer is obtained, thereby indicating the operating state of the transformer;

[0020] According to the operating status of the circuit breaker, switch, busbar and transformer, the real-time operating status of the power grid equipment is indicated.

[0021] Further, including:

[0022] The initiating power grid power failure topology calculation based on the accident tripping information includes:

[0023] Determine the information startup method when the device loses power;

[0024] Obtaining the operating status of the equipment before and after power failure according to the real-time operating status representation formula of the power grid equipment;

[0025] According to the operating status of the equipment before and after power failure, a list of power failure equipment and the corresponding power failure topology of the power grid are obtained.

[0026] Further, including:

[0027] The information startup method of determining when the device loses power includes:

[0028] Confirm the type of power failure of the equipment. If it is a power grid accident trip, use the power grid dispatching and control system to trigger the power failure line, bus, and transformer protection action information; otherwise,

[0029] If it is an accident tripping event in which the equipment protection information is not uploaded, the switch change signal and the accident signal of the corresponding switch are triggered in the power grid dispatching control system; otherwise,

[0030] If it is an extremely abnormal tripping event, an accident tripping signal will be triggered in the power grid dispatching and control system. The extremely abnormal tripping event includes a large amount of alarm information being leaked and uploaded.

[0031] Further, including:

[0032] The method of obtaining a power failure device list and a corresponding power failure topology of a power grid according to the operating status of the device before and after the power failure includes:

[0033] Performing XOR operation on the real-time operating status of the power grid equipment before the power failure topology calculation is triggered and the real-time operating status of the power grid equipment after the power failure topology calculation is triggered can obtain a power failure equipment list;

[0034] The corresponding equipment in the power failure equipment list is found in the power grid equipment association matrix to obtain the power failure topology representation of the power grid, wherein the non-all-zero rows in the power failure topology representation of the power grid are the power failure equipment of the power grid and its network association, that is, the power failure topology.

[0035] Further, including:

[0036] The real-time operating status of the power grid equipment includes:

[0037] When the circuit breaker is in the closed position, if there is current flowing at this time, it means that the circuit breaker is in operation; when the circuit breaker is in the open position or there is no current flowing, it means that the circuit breaker is in power-off state;

[0038] When the three-phase voltages of the bus are all zero, the bus is judged to be in a power-off state; otherwise, the bus is judged to be in a running state;

[0039] When the product of the correlation matrix after eliminating the transformer and the operating status of the power grid equipment other than the transformer is greater than zero, the transformer is judged to be in an operating state. Otherwise, if the product is equal to zero, the transformer is judged to be in a non-operating state.

[0040] On the other hand, the present invention also provides a system for automatically distinguishing power grid power failure topology, the system comprising:

[0041] The association matrix building module is used to obtain the terminal numbers of the first and last terminals of the power grid equipment, and to determine the association between the equipment according to the first and last terminal numbers, thereby generating the association matrix of the power grid equipment;

[0042] A real-time operation status calculation module is used to obtain the operation status of the circuit breaker, switch, busbar and transformer in combination with the power grid equipment association matrix, and finally generate the real-time operation status of the power grid equipment;

[0043] The power failure topology calculation module is used to start the power failure topology calculation based on the accident tripping information, so as to obtain the power failure equipment list and the power failure topology of the power grid.

[0044] Beneficial effects: Compared with the prior art, the present invention has the following beneficial effects:

[0045] 1. The method of the present invention first obtains the terminal numbers of the head end and the terminal end of the power grid equipment, and determines the association between the equipment according to the terminal numbers, thereby generating a power grid equipment association matrix; then, the operating status of the circuit breaker, knife switch, busbar and transformer is obtained in combination with the power grid equipment association matrix, and finally the real-time operating status of the power grid equipment is generated; finally, the power grid power failure topology calculation is started based on the accident tripping information, thereby obtaining a power failure equipment list and a power grid power failure topology. Therefore, the power failure equipment can be automatically identified and the power grid power failure topology can be generated after a tripping event occurs, thereby ensuring the accuracy and timeliness of the accident report.

[0046] 2. This method can automatically identify the power-off devices in the entire network and provide the topological association between the power-off devices when an accident tripping event occurs in the power grid, thereby intuitively displaying the scope of power failure caused by the accident tripping, effectively reducing the difficulty of accident identification for operating personnel on duty, and significantly improving the efficiency and accuracy of accident reporting by personnel on duty. Therefore, the power-off topology generated by the method of the present invention provides an important reference for subsequent accident handling, which can effectively shorten the power-on event, shorten the power outage duration for users, and ensure user satisfaction with electricity consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a flow chart of a method for determining power grid power failure topology according to an embodiment of the present invention;

[0048] Figure 2 A schematic diagram of a head-end endpoint and a terminal endpoint of a device in a power grid dispatching and control system taking a circuit breaker as an example according to an embodiment of the present invention;

[0049] Figure 3 The circuit breaker and switch operation status calculation logic according to the embodiment of the present invention;

[0050] Figure 4 The busbar operation status calculation logic described in the embodiment of the present invention;

[0051] Figure 5 The transformer operation status calculation logic described in the embodiment of the present invention;

[0052] Figure 6 This is the power grid power failure topology calculation startup logic described in the embodiment of the present invention. DETAILED DESCRIPTION

[0053] The present invention is further explained below in conjunction with the accompanying drawings. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent modifications of the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0054] Figure 1 The invention discloses a flow chart of a method for distinguishing power grid power failure topology. First, the head-to-tail connection relationship of all devices in the power grid is calculated according to the head-end and tail terminal numbers of the primary equipment of the power grid, and then the power grid equipment association matrix is ​​obtained; then, the real-time operation status of the circuit breaker, knife switch, busbar and transformer is distinguished according to the operation status of each type of equipment and the electrical quantity data such as voltage and current; then, the triggering conditions for automatic distinguishing the power grid power failure topology are set based on the monitoring alarm information such as protection action, switch displacement, accident tripping, etc.; finally, the automatic generation of the power grid power failure topology is realized according to the change of the real-time operation status of the power grid equipment and the power grid association matrix.

[0055] For a normally operating power network, when a power grid device trips, the device operating state will change. Therefore, the power failure topology can be calculated based on the change in the device state and the initial connection relationship of the power grid device. The method has the following steps:

[0056] Step 1: Calculate the power grid equipment association matrix based on the head-end association relationship of the power grid equipment

[0057] (1) Obtain the first and last endpoint numbers of the power grid equipment:

[0058] Figure 2 The figure shows the schematic diagram of the head-end and the end-end of the equipment in the power grid dispatching control system. The head-end number of the equipment ε is ε begin , the end point number is ε end .

[0059] (2) Determine whether the devices are related:

[0060] If two devices are associated with each other, the first end point number of device ε1 is the same as the last end point number of device ε2, or the last end point number of device ε1 is the same as the first end point number of device ε2, that is, the following conditions are met:

[0061] ε 1begin =ε 2end or ε1end =ε 2begin (1)

[0062] For device ε1, the relationship matrix of the device can be obtained by retrieving the head-end and end-end terminal numbers of all other devices in the power grid:

[0063] R1=(r 11 r 12 … r 1n ) (2)

[0064] Where n represents the total number of devices in the power grid, r ij Indicates the association relationship between device i and device j, that is:

[0065] r ij =if{ε ibegin =ε jend or ε iend =ε jbegin} (3)

[0066] Among them, r ij If it is 0, it means that there is no direct association between device i and device j. Otherwise, it means that there is a direct association between device i and device j.

[0067] (3) Generate a grid equipment association matrix

[0068] By calculating the association matrix of all devices in the power grid, we can get the power grid equipment association matrix R:

[0069]

[0070] Step 2: Determine the real-time operating status of the equipment based on the operating status of the power grid equipment and the voltage and current values

[0071] (4) Calculate the operating status d of the circuit breaker and switch:

[0072] The operating status of circuit breakers and switchgear is calculated in the same way. Here, the circuit breaker is used as an example to illustrate the calculation method. i According to the opening and closing state of the circuit breaker i and the current value I flowing through the circuit breaker i Decide. Here we use Indicates the current state quantity flowing through the circuit breaker. When I i When the current state is not 0, it is 1, otherwise it is 0, that is:

[0073]

[0074] The running state is d i The calculation formula is as follows:

[0075]

[0076] like Figure 3 As shown, when the circuit breaker i is in the closed position, z i = 1. If current is flowing at this time, the operating state d i =1, indicating that the circuit breaker is in the operating state. When the circuit breaker is in the open position or there is no current flowing, the operating state d i =0, indicating that the circuit breaker is in power-off state.

[0077] (5) Calculate the busbar operation status m:

[0078] The operating state m of bus i i The three-phase voltage of the bus and Decide. Here we use and The state quantity representing the three-phase voltage of the busbar, taking phase a as an example, the calculation formula is as follows:

[0079]

[0080] The busbar operation state m i The calculation formula is:

[0081]

[0082] like Figure 4 As shown in the figure, considering that after the accident tripping event, there may be an abnormal situation of missing operation, when the three-phase voltage of the bus is 0, it is determined that the bus is in a power outage state. At this time, m i = 0, otherwise, the bus is judged to be in operation state, and the operation state quantity m i =1.

[0083] (6) Calculate the transformer operating state b:

[0084] Transformer i operating state b i Determined by the operating status of the equipment associated with it, according to formula (4), the association matrix of transformer i is:

[0085] R i×n =(r i1 r i2 … r in ) (9)

[0086] After removing transformer i, the association matrix becomes:

[0087] R 1×n-1 =(r i1 r i2 … r ii-1 rii+1 … r in ) (10)

[0088] Use Y n-1×1 Indicates the operating status of the power grid equipment except transformer i:

[0089]

[0090] Then the operating state of transformer i is b i The calculation formula is as follows:

[0091]

[0092] like Figure 5 As shown, the transformer is considered to be in a power-off state only when all devices connected to the transformer are in a power-off state. Otherwise, it is in an operating state.

[0093] (7) Generate real-time operating status of power grid equipment

[0094] According to the calculation results of (4) to (6) above, the real-time operation status S of the power grid equipment can be generated. 1×n :

[0095] S 1×n =(d1…m1…b1…) (13)

[0096] Among them, S 1×n The arrangement order of circuit breakers, switches, busbars and transformers is consistent with formula (2).

[0097] Step 3: Start the power grid outage topology calculation based on the accident tripping information

[0098] There are three ways to start the power grid power failure topology calculation, such as Figure 6 shown.

[0099] The power failure topology calculation in this embodiment refers to calculating the power failure devices and their associations, that is, power failure topology identification. The following three startup methods are the scenarios and quantitative conditions for starting the power failure topology calculation, and the corresponding information is started through the corresponding signal. Specifically,

[0100] (8) Startup method based on “protection action” information:

[0101] For general power grid accident tripping events, a startup method based on "protection action" information triggering is adopted, that is, after a line, busbar, or transformer protection action signal is triggered in the power grid dispatching and control system, the power failure topology calculation process is automatically entered.

[0102] (9) Startup method based on “switch position change” information:

[0103] For accident tripping events where the equipment protection information has not been uploaded, a startup method based on the "switch position change" information trigger is adopted. That is, after the "switch position change" and the "accident total" signal of the corresponding switch are triggered in the power grid dispatching and control system, the power failure topology calculation process is automatically entered.

[0104] (10) Startup method based on “accident trip” information:

[0105] In response to tripping events under extreme abnormal conditions such as a large amount of alarm information being missed from being uploaded, a starting method based on "accident tripping" information is adopted. That is, after the "accident tripping" signal is triggered in the power grid dispatching and control system, the power failure topology calculation process is automatically entered.

[0106] Step 4: Generate power failure topology based on the association matrix and the real-time operation status of the equipment

[0107] (11) Calculate the list of power-off equipment:

[0108] The real-time operating status of the power grid equipment before the power failure topology calculation is triggered is recorded as S t0 The real-time operation status of the power grid equipment after the power failure topology calculation is triggered is recorded as S t1 , perform XOR operation on the two running states to get the power-off equipment list S * :

[0109]

[0110] (12) Calculate the power grid failure topology:

[0111] Find the equipment in the power failure equipment list in the power grid equipment association matrix to obtain the power grid power failure topology R poe , the calculation formula is as follows:

[0112] R poe =(((S * ) T E)⊙D)R(15)

[0113] Among them, E represents a 1-row n-column all-one matrix, D represents an n-order identity matrix, and ⊙ represents matrix bitwise multiplication. It can be seen that R poe The non-all-0 rows in the matrix are the power-off devices and their network associations, i.e., the power-off topology. In the above, R is a complete matrix, including all devices in the power grid (power-off and non-power-off), and S* is the power-off devices in the power grid. Therefore, according to S*, the associations of the power-off devices can be directly screened out from R, i.e., R poe The power failure topology is to quickly know the power failure equipment and its related relationships after an accident occurs in the power grid, so as to assist the on-duty personnel to quickly determine the scope of the fault.

[0114] On the other hand, the present invention also provides a system for automatically distinguishing power grid power failure topology, the system comprising:

[0115] The association matrix building module is used to obtain the terminal numbers of the first and last terminals of the power grid equipment, and to determine the association between the equipment according to the first and last terminal numbers, thereby generating the association matrix of the power grid equipment;

[0116] A real-time operation status calculation module is used to obtain the operation status of the circuit breaker, switch, busbar and transformer in combination with the power grid equipment association matrix, and finally generate the real-time operation status of the power grid equipment;

[0117] The power failure topology calculation module is used to start the power failure topology calculation based on the accident tripping information, so as to obtain the power failure equipment list and the power failure topology of the power grid.

[0118] Other technical features of the automatic power grid power failure topology determination system described in this embodiment are similar to those of the automatic power grid power failure topology determination method, and are not described in detail in the present invention.

[0119] The embodiments of the present application may be provided as methods, systems or computer program products. Therefore, the present application may adopt the form of complete hardware embodiments, complete software embodiments or embodiments in combination with software and hardware. Moreover, the present application may adopt 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.) that contain computer-usable program code.

[0120] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, 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 generate 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 flowchart and / or block diagram. 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.

[0121] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate 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 A function specified in one or more boxes.

[0122] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0123] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other 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.

[0124] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, if these modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for automatically identifying power grid power failure topology, characterized in that: The method includes: Obtaining the terminal numbers of the first and last terminals of the power grid equipment, and determining the association between the equipment according to the terminal numbers of the first and last terminals, thereby generating a power grid equipment association matrix; The operation status of the circuit breaker, switch, busbar and transformer is obtained by combining the power grid equipment association matrix, and finally the real-time operation status of the power grid equipment is generated; The power grid power failure topology calculation is started based on the accident tripping information, thereby obtaining the power failure equipment list and the power grid power failure topology.

2. The method for automatically distinguishing power grid power failure topology according to claim 1, characterized in that: The determining the association between devices according to the head-end and the end-end endpoint numbers, thereby generating a power grid device association matrix, includes: Directly obtain the first and last endpoint numbers of power grid equipment from the power grid dispatching control system database; Compare the head-end endpoint numbers and the end-end endpoint numbers of two power grid devices. If the head-end endpoint number of the current device is the same as the end-end endpoint number of another power grid device, or if the end-end endpoint number of the current device is the same as the head-end endpoint number of another power grid device, then the two power grid devices are considered to be related to each other. Retrieve the relationship between the head end terminal number and the end end terminal number of all other devices in the power grid and the current device, so as to obtain the association relationship matrix of the current device; Based on the association matrix of the current equipment, the association matrix of all equipment in the power grid can be calculated to obtain the power grid equipment association matrix.

3. The method for automatically distinguishing power grid power failure topology according to claim 2 is characterized in that: The operation status of the circuit breaker, the switch, the busbar and the transformer is obtained by combining the power grid equipment association matrix, including: The operation state of the corresponding circuit breaker is calculated by using the opening and closing state of the circuit breaker and the state quantity of the current flowing through the circuit breaker; The operation state of the corresponding knife switch is calculated by using the opening and closing state of the knife switch and the state quantity of the current flowing through the knife switch; The busbar operating status is displayed according to the three-phase voltage of the busbar; The operating state of the transformer is determined by the operating state of the equipment associated with it. According to the power grid equipment association matrix, the association matrix after removing the transformer is obtained, thereby indicating the operating state of the transformer; According to the operating status of the circuit breaker, switch, busbar and transformer, the real-time operating status of the power grid equipment is indicated.

4. The method for automatically distinguishing power grid power failure topology according to claim 3 is characterized in that: The initiating power grid power failure topology calculation based on the accident tripping information includes: Determine the information startup method when the device loses power; Obtaining the operating status of the equipment before and after power failure according to the real-time operating status representation formula of the power grid equipment; According to the operating status of the equipment before and after power failure, a list of power failure equipment and the corresponding power failure topology of the power grid are obtained.

5. The method for automatically distinguishing power grid power failure topology according to claim 4 is characterized in that: The information startup method of determining when the device loses power includes: Confirm the type of power failure of the equipment. If it is a power grid accident trip, use the power grid dispatching and control system to trigger the power failure line, bus, and transformer protection action information; otherwise, If it is an accident tripping event in which the equipment protection information is not uploaded, the switch change signal and the accident signal of the corresponding switch are triggered in the power grid dispatching control system; otherwise, If it is an extremely abnormal tripping event, an accident tripping signal will be triggered in the power grid dispatching and control system. The extremely abnormal tripping event includes a large amount of alarm information being leaked and uploaded.

6. The method for automatically distinguishing power grid power failure topology according to claim 5, characterized in that: The method of obtaining a power failure equipment list and a corresponding power failure topology of a power grid according to the operating status of the equipment before and after power failure includes: Performing XOR operation on the real-time operating status of the power grid equipment before the power failure topology calculation is triggered and the real-time operating status of the power grid equipment after the power failure topology calculation is triggered can obtain a power failure equipment list; The corresponding equipment in the power failure equipment list is found in the power grid equipment association matrix to obtain the power failure topology representation of the power grid, wherein the non-all-zero rows in the power failure topology representation of the power grid are the power failure equipment of the power grid and its network association, that is, the power failure topology.

7. The method for automatically distinguishing power grid power failure topology according to claim 6, characterized in that: The real-time operating status of the power grid equipment includes: When the circuit breaker is in the closed position, if there is current flowing at this time, it means that the circuit breaker is in operation; when the circuit breaker is in the open position or there is no current flowing, it means that the circuit breaker is in power-off state; When the three-phase voltages of the bus are all zero, the bus is judged to be in a power-off state; otherwise, the bus is judged to be in a running state; When the product of the correlation matrix after eliminating the transformer and the operating status of the power grid equipment other than the transformer is greater than zero, the transformer is judged to be in an operating state. Otherwise, if the product is equal to zero, the transformer is judged to be in a non-operating state.

8. A power grid power failure topology automatic identification system, characterized in that: The system includes: The association matrix building module is used to obtain the terminal numbers of the first and last terminals of the power grid equipment, and to determine the association between the equipment according to the first and last terminal numbers, thereby generating the association matrix of the power grid equipment; A real-time operation status calculation module is used to obtain the operation status of the circuit breaker, switch, busbar and transformer in combination with the power grid equipment association matrix, and finally generate the real-time operation status of the power grid equipment; The power failure topology calculation module is used to start the power failure topology calculation based on the accident tripping information, so as to obtain the power failure equipment list and the power failure topology of the power grid.

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