A method and system for determining power failure of AC section in power system

Abstract

The present invention discloses a method and system for distinguishing power failure of AC section in an electric power system. The method obtains basic information of substations at all levels in the electric power system, determines the in-station components and AC sections that need to be distinguished and connected to the system, generates the connection status of the upper-level disconnected lines and the lower-level lines of the substations at all levels for the upper-level sections and lower-level sections of each substation, forms a connection matrix, and thus calculates the connection status of the in-station components and the system. The method and system can be used for AC sections with a long chain structure in which multiple stations are connected in series, and can accurately and comprehensively distinguish the power failure of the AC section lines. The reliability and accuracy are improved compared with the existing electric power system, and the technical problem of low reliability and accuracy of AC section power failure distinction in the existing AC section power failure distinction system is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of section power failure detection, and in particular to a method and system for distinguishing power failure of an AC section of an electric power system. Background Art

[0002] DC transmission is an important means of power transmission. However, when there is no AC channel for transmission at the DC receiving converter station, the converter station equipment (such as converter valves and lightning arresters) will be damaged due to overvoltage. The AC section power failure at the DC receiving converter station refers to the situation where the AC outgoing line of the receiving converter station is abnormally disconnected, resulting in the inability to send DC power. When there are fewer AC outgoing lines at the DC receiving end, an AC section power failure judgment system is usually configured. When it is judged that the operating converter station has lost connection with the AC system, the AC section power failure status information is sent to the DC control and protection system to lock the DC.

[0003] The current AC section power failure system mainly configures an AC section power failure identification device at the next-level substation, which only identifies the AC section power failure situation on the next-level substation side, while the AC section situation on the converter station side is identified by the DC control and protection. The existing identification method of this AC section power failure system has the following problems:

[0004] (1) For a two-level AC section, when the switch at the converter station side of one AC line is disconnected and the switch at the next-level substation side is closed, and the switch at the converter station side of other AC lines is closed and the switch at the next-level substation side is disconnected, the existing AC section power failure identification method cannot accurately identify the AC section power failure situation;

[0005] (2) For AC sections with a long chain structure of multiple stations in series, if the first-level substation and the second-level substation lose power, or if the AC sections of substations after the second level lose power, the existing AC section power failure identification method is also unable to accurately identify the AC section power failure situation.

[0006] Therefore, improving the reliability and accuracy of identifying power failures in AC sections of power systems is a technical problem that needs to be urgently solved by those skilled in the art. Summary of the invention

[0007] The present invention provides a method and system for distinguishing AC section power failure in an electric power system, which are used to solve the technical problem of low reliability and accuracy of AC section power failure distinguishing system in existing AC section power failure distinguishing system.

[0008] In view of this, a first aspect of the present invention provides a method for determining power failure in an AC section of an electric power system, comprising:

[0009] Collect basic information of each substation in the power system, including topology information, bus information, loop information, switch information and protection action information of components in the substation, and determine the information of components in the substation that need to be judged for connection status with the system based on the basic information;

[0010] According to the topological connection relationship between each substation, determine the AC section and connection line between the components in each substation and the system;

[0011] According to the upper section lines and lower section lines of each substation, the connectivity status C of the i-th connection line of the upper section of each substation and the j-th line of the lower section is generated. k,ij , where the first-level substation only needs to determine the connectivity between the component and the next-level section line, and the last-level substation only needs to determine the connectivity of the previous-level section line, i∈[1,n], j∈[1,m], n is the number of connection lines of the previous-level section of the substation, m is the number of connection lines of the next-level section of the substation, and k is the substation level number;

[0012] According to the connectivity status C k,ij Generate a power system substation connectivity matrix, wherein the power system substation connectivity matrix includes a connectivity matrix of a first-level substation, a connectivity matrix of a last-level substation, and a connectivity matrix of an intermediate-level substation;

[0013] The connectivity status between the components in the substation and the system is calculated according to the connectivity matrix of the power system substation, and the AC section power failure judgment result is obtained.

[0014] Optionally, the calculation formula for calculating the connectivity status of the components in the substation and the system according to the connectivity matrix of the power system substation is:

[0015]

[0016] Among them, P is the connectivity status between the components in the station and the system, C k is the connectivity matrix of the k-th substation, and f is the total number of substations.

[0017] Optionally, it also includes:

[0018] Real-time detection of whether the power system status has changed, if so, return to recalculate the connectivity status C k,ij .

[0019] Optionally, it also includes:

[0020] Check whether each substation has a non-section power failure or abnormal communication with the main station. If there is a substation with a non-section power failure or abnormal communication with the main station, the substation with the non-section power failure or abnormal communication with the main station will not participate in the connectivity judgment of the components and the system.

[0021] Optionally, the connectivity matrix of the first-level substation is:

[0022] C1=[C 1,11 ,…,C 1,1j , …, C 1,1m ].

[0023] Optionally, the connectivity matrix of the last-level substation is:

[0024]

[0025] Optionally, the connectivity matrix of the intermediate substation is:

[0026]

[0027] A second aspect of the present invention provides a power system AC section power failure identification system, comprising:

[0028] The acquisition module is used to collect basic information of each substation in the power system, including topological information, bus information, loop information, switch information and protection action information of components in the substation, and determine the information of components that need to be judged for connection status with the system based on the basic information;

[0029] The section line detection module is used to determine the AC section and connection line where the components in each substation are connected to the system according to the topological connection relationship between each substation;

[0030] The section status detection module is used to generate the connectivity status C of the i-th connection line of the upper section and the j-th line of the lower section of each substation according to the upper section lines and lower section lines of each substation. k,ij , where the first-level substation only needs to determine the connectivity between the component and the next-level section line, and the last-level substation only needs to determine the connectivity of the previous-level section line, i∈[1,n], j∈[1,m], n is the number of connection lines of the previous-level section of the substation, m is the number of connection lines of the next-level section of the substation, and k is the substation level number;

[0031] The connectivity matrix calculation module is used to calculate the connectivity matrix according to the connectivity state C k,ij Generate a power system substation connectivity matrix, wherein the power system substation connectivity matrix includes a connectivity matrix of a first-level substation, a connectivity matrix of a last-level substation, and a connectivity matrix of an intermediate-level substation;

[0032] The component connectivity status detection module is used to calculate the connectivity status of the component and the system according to the power system substation connectivity matrix.

[0033] Optionally, it also includes:

[0034] The system status detection module is used to detect in real time whether the power system status has changed. If so, it returns to the section status detection module to recalculate the connectivity status C k,ij .

[0035] Optionally, it also includes:

[0036] The fault detection module is used to generate the connectivity status C of the i-th connection line of the upper section and the j-th line of the lower section of each substation according to the upper section lines and lower section lines of each substation. k,ij Previously, each substation was checked to see if a non-section power failure or abnormal communication with the main station occurred. If there was a substation with a non-section power failure or abnormal communication with the main station, the substation with the non-section power failure or abnormal communication with the main station would not participate in the connectivity determination of the components and the system.

[0037] It can be seen from the above technical solutions that the method and system for determining AC section power failure in a power system provided by the present invention have the following advantages:

[0038] The method and system for distinguishing power failure of AC section in an electric power system provided by the present invention obtain basic information of substations at all levels in the electric power system, determine the in-station components and AC sections that need to be distinguished and connected to the system, generate the connectivity status of the upper-level disconnected lines and the lower-level lines of the substations at all levels for the upper-level sections and lower-level sections of each substation, form a connectivity matrix, and thus calculate the connectivity status of the in-station components and the system. The method and system can be used for AC sections with a long chain structure in which multiple stations are connected in series, and can accurately and comprehensively distinguish power failure of AC section lines. The reliability and accuracy are improved compared with the existing electric power system, and the technical problem of low reliability and accuracy of AC section power failure distinction in the existing AC section power failure distinction system is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 A schematic diagram of a flow chart of a method for determining power failure in an AC section of an electric power system provided in the present invention;

[0041] Figure 2 It is another flow chart of a method for determining power failure in AC section of a power system provided by the present invention;

[0042] Figure 3 A schematic diagram of the system architecture of the multi-stage plant-station chain structure provided in the present invention;

[0043] Figure 4 A schematic diagram of a chain-type transmission structure of a converter multi-stage substation in an application example provided in the present invention;

[0044] Figure 5 The present invention is a schematic structural diagram of a power system AC section power failure identification system provided in the present invention. DETAILED DESCRIPTION

[0045] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] For easier understanding, see Figure 1 The present invention provides an embodiment of a method for determining power failure of an AC section of an electric power system, comprising:

[0047] Step 101: Collect basic information of each substation in the power system, including topology information, bus information, loop information, switch information and protection action information of components in the substation, and determine information of components in the substation that need to be identified for connectivity with the system based on the basic information.

[0048] It should be noted that, in the embodiment of the present invention, the basic information of each substation in the power system is first collected, including the topological structure information, bus information, loop information, switch information and protection action information of the components within the station, and then the information of the components within the station that need to be judged for connectivity with the system is determined, such as the information of the converter or generator in the converter station.

[0049] Step 102: According to the topological connection relationship between the substations, determine the AC section and connection line between the components in each substation and the system.

[0050] It should be noted that, combined with the topological connection information between each substation, such as which line is connected between which two switches, which line is connected between different stations, etc., the AC sections and corresponding lines connecting the components in the station to the system are determined, including the AC sections and connecting lines between substations at all levels.

[0051] Step 103: Generate the connectivity status C of the i-th connection line of the upper section and the j-th line of the lower section of each substation according to the upper section lines and the lower section lines of each substation. k,ij, where the first-level substation only needs to determine the connectivity status between the component and the next-level section line, and the last-level substation only needs to determine the connectivity status of the upper-level section line, i∈[1,n], j∈[1,m], n is the number of connection lines of the upper-level section of the substation, m is the number of connection lines of the lower-level section of the substation, and k is the substation level number.

[0052] It should be noted that for the upper section lines and lower section lines of each substation, the connectivity status C of the i-th connection line of the upper section of each substation and the j-th line of the lower section is generated. k,ij , i∈[1,n], j∈[1,m], n is the number of connected lines of the upper section of the substation, m is the number of connected lines of the lower section of the substation, k is the substation level number, C k,ij When the value is 1, it means connected, C k,ij When the value is 0, it means no connection. For the first-level substation, it is only necessary to determine the connectivity between the component and the next-level section line. The last-level substation only needs to determine the connectivity of the upper-level section line, that is, to determine the connectivity between the upper-level section line and the substation busbar, or the connectivity with the external line.

[0053] Step 104: According to the connection status C k,ij A power system substation connectivity matrix is ​​generated, wherein the power system substation connectivity matrix includes a connectivity matrix of a first-level substation, a connectivity matrix of a last-level substation, and a connectivity matrix of an intermediate-level substation.

[0054] It should be noted that according to the connectivity state C k,ij The power system substation connectivity matrix can be generated as follows:

[0055] For the connectivity matrix of the intermediate substation, we have:

[0056]

[0057] For the connectivity matrix of the first-level substation, we have:

[0058] C1=[C 1,11 ,…,C 1,1j , …, C 1,1m ]

[0059] For the connectivity matrix of the last substation, we have:

[0060]

[0061] Step 105: Calculate the connectivity status of the substation components and the system according to the power system substation connectivity matrix to obtain the AC section power failure judgment result.

[0062] It should be noted that after obtaining the power system substation connectivity matrix, the connectivity status between the components in the substation and the system can be calculated. Specifically, the calculation formula for calculating the connectivity status between the components in the substation and the system is:

[0063]

[0064] Among them, P is the connectivity status between the components in the station and the system, C k is the connectivity matrix of the k-th substation, and f is the total number of substations. If P is 1, it means that the components in the substation are connected to the system, and if P is 0, it means that the components in the substation are disconnected from the system, that is, AC section power failure occurs.

[0065] The method for distinguishing power failure of AC section in an electric power system provided by an embodiment of the present invention obtains basic information of substations at all levels in the electric power system, determines the in-station components and AC sections that need to be distinguished and connected to the system, generates the connectivity status of the upper-level broken lines and the lower-level lines of the substations at all levels for the upper-level sections and lower-level sections of each substation, and forms a connectivity matrix, thereby calculating the connectivity status of the in-station components and the system. The method can be used for AC sections with a long chain structure in which multiple sites are connected in series, and can accurately and comprehensively distinguish power failure of AC section lines. The reliability and accuracy are improved compared with the existing electric power system, and the technical problem of low reliability and accuracy of AC section power failure judgment in the existing AC section power failure judgment system is solved.

[0066] like Figure 2 As shown, in one embodiment, after step 105, the method further includes:

[0067] Step 106: Real-time detection of whether the power system state has changed. If so, return to recalculate the connectivity state C. k,ij .

[0068] It should be noted that changes in the power system state, such as switch position changes or protection triggering that may cause switch position changes, may cause the connectivity state C of the station components to the system to change. k,ij Therefore, it is necessary to detect in real time whether the power system state has changed. When the power system state is detected to have changed, return to step 103 to recalculate the connection state C between the components in the station and the system. k,ij .

[0069] In one embodiment, according to the upper section lines and lower section lines of each substation, the connection state C of the i-th connection line of the upper section of each substation and the j-th line of the lower section is generated. k,ij Previously, the following steps were also included:

[0070] Check whether each substation has a non-section power failure or abnormal communication with the main station. If there is a substation with a non-section power failure or abnormal communication with the main station, the substation with the non-section power failure or abnormal communication with the main station will not participate in the connectivity judgment of the components and the system.

[0071] It should be noted that if Figure 3 As shown, Figure 3 The system architecture diagram of the multi-level plant-station chain structure is shown in Figure 1. The substation identification substations at each level only identify the connectivity status of the upper section line and the lower section line of the station, and send the connectivity status matrix to the identification master station. The identification master station integrates the connectivity matrix information of each substation substation to identify the connection and power failure status of the components in the station and the system. When any substation has a non-section power failure or abnormal communication with the identification master station, the elements of the identification matrix received by the identification master station from the corresponding substation are all 1, that is, it is considered that the upper section line and the lower section line of the corresponding substation are in a connected state, and do not participate in the connectivity judgment of the components and the system. Only other valid substations participate in the connectivity judgment.

[0072] See also Figure 4 In order to more conveniently understand the implementation principle and effect of the method for determining power failure of AC section in a power system provided by an embodiment of the present invention, an application example of the method for determining power failure of AC section in a power system is provided in the present invention. It should be understood that the application example provided in the present invention is only for the scenario of a 3-level substation chain transmission structure, and the same can be obtained for substation chain transmission structures of other levels. Figure 4 This is a schematic diagram of the converter multi-stage substation chain transmission structure provided in the application example of the present invention, wherein the converter is connected to substation 1, substation 1 is connected to substation 2 through lines L1 and L2, substation 2 is connected to substation 3 through lines L3 and L4, and the substation is connected to the external system through two circuits and busbars. a1-a3, b1-b3 are switches in substation 1, d1-d3, e1-e3 are switches in substation 2, and x1-x3, y1-y3 are switches in substation 3.

[0073] Assumptions Figure 4 In the figure, switches a1 and b1 in substation 1 are closed, and other switches are open; switches d2, d3, e1, e2, and e3 in substation 2 are closed, and other switches are open; switches y2 and y3 in substation 3 are closed, and other switches are open.

[0074] For substation 1, the components (i.e. Figure 4 The converter in the lower section line 1 (i.e. Figure 4 L1 in the Figure 4 The calculation result of the L2) connectivity state in is:

[0075] C 1,11 =1, C1,12 =0

[0076] The calculation result of the connectivity matrix of substation 1 is:

[0077] C1=[C 1,11 C 1,12 ]=[1 0]

[0078] For substation 2, the upper section line 1 (i.e. Figure 4 L1 in the Figure 4 L2 in the figure) and the lower section line 1 (i.e. Figure 4 Line L3 in the Figure 4 The calculation result of the connection state of line L4 in is:

[0079] C 2,11 =0, C 2,12 =1, C 2,21 =0, C 2,22 =0

[0080] The calculation result of the connectivity matrix of substation 2 is:

[0081]

[0082] For substation 3, the upper section line 1 (i.e. Figure 4 Line L3 in the Figure 4 The calculation result of the connection status of line L4 in the system is:

[0083] C 3,11 =0, C 3,21 =1

[0084] The calculation result of the connectivity matrix of substation 3 is:

[0085]

[0086] Therefore, the calculation result of the connection status between the component and the system is:

[0087]

[0088] P is 1, indicating that the converter is connected to the system.

[0089] When the switch e2 in the substation 2 is disconnected, the upper section line 1 (i.e. Figure 4 Line L1 in the middle) and lower section line 2 (i.e. Figure 4 The line L4) in the connection is broken, that is:

[0090]

[0091] Therefore, the calculation result of the connection status between the component and the system is:

[0092]

[0093] P is 0, indicating that the converter and the system are out of power.

[0094] For easier understanding, see Figure 5 The present invention provides an embodiment of a system for determining AC section power failure in a power system, comprising:

[0095] The acquisition module is used to collect basic information of each substation in the power system, including topological information, bus information, loop information, switch information and protection action information of components in the substation, and determine the information of components that need to be judged for connection status with the system based on the basic information;

[0096] The section line detection module is used to determine the AC section and connection line where the components in each substation are connected to the system according to the topological connection relationship between each substation;

[0097] The section status detection module is used to generate the connectivity status C of the i-th connection line of the upper section and the j-th line of the lower section of each substation according to the upper section lines and lower section lines of each substation. k,ij , where the first-level substation only needs to determine the connectivity between the component and the next-level section line, and the last-level substation only needs to determine the connectivity of the previous-level section line, i∈[1,n], j∈[1,m], n is the number of connection lines of the previous-level section of the substation, m is the number of connection lines of the next-level section of the substation, and k is the substation level number;

[0098] The connectivity matrix calculation module is used to calculate the connectivity matrix according to the connectivity state C k,ij Generate a power system substation connectivity matrix, wherein the power system substation connectivity matrix includes a connectivity matrix of a first-level substation, a connectivity matrix of a last-level substation, and a connectivity matrix of an intermediate-level substation;

[0099] The component connectivity status detection module is used to calculate the connectivity status of the component and the system according to the power system substation connectivity matrix.

[0100] Also includes:

[0101] The system status detection module is used to detect in real time whether the power system status has changed. If so, it returns to the section status detection module to recalculate the connectivity status C k,ij .

[0102] Also includes:

[0103] The fault detection module is used to generate the connectivity status C of the i-th connection line of the upper section and the j-th line of the lower section of each substation according to the upper section lines and lower section lines of each substation. k,ij Previously, each substation was checked to see if a non-section power failure or abnormal communication with the main station occurred. If there was a substation with a non-section power failure or abnormal communication with the main station, the substation with the non-section power failure or abnormal communication with the main station would not participate in the connectivity determination of the components and the system.

[0104] The calculation formula for calculating the connectivity status between the components in the substation and the system according to the connectivity matrix of the power system substation is:

[0105]

[0106] Among them, P is the connectivity status between the components in the station and the system, C k is the connectivity matrix of the k-th substation, and f is the total number of substations.

[0107] The connectivity matrix of the first-level substation is:

[0108] C1=[C 1,11 ,…,C 1,1j , …, C 1,1m ].

[0109] The connectivity matrix of the last substation is:

[0110]

[0111] The connectivity matrix of the intermediate substation is:

[0112]

[0113] The power system AC section power failure judgment system provided by the embodiment of the present invention obtains basic information of substations at all levels of the power system, determines the in-station components and AC sections that need to be judged to be connected to the system, generates the connectivity status of the upper-level broken lines and the lower-level lines of each substation for the upper-level sections and lower-level sections of each substation, and forms a connectivity matrix, thereby calculating the connectivity status of the in-station components and the system. It can be used for AC sections with a long chain structure of multi-level sites in series, and can accurately and comprehensively judge the power failure of AC section lines. The reliability and accuracy are improved compared with the existing power system, and the technical problem of low reliability and accuracy of AC section power failure judgment in the existing AC section power failure judgment system is solved.

[0114] The power system AC section power failure judgment system provided in an embodiment of the present invention is used to execute the power system AC section power failure judgment method in the aforementioned power system AC section power failure judgment method embodiment, and its principle is the same as the power system AC section power failure judgment method in the aforementioned power system AC section power failure judgment method embodiment, and will not be repeated here.

[0115] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for determining power failure in AC section of a power system, characterized in that: include: Collect basic information of each substation in the power system, including topology information, bus information, loop information, switch information and protection action information of components in the substation, and determine the information of components in the substation that need to be judged for connection status with the system based on the basic information; According to the topological connection relationship between each substation, determine the AC section and connection line between the components in each substation and the system; According to the upper section lines and lower section lines of each substation, the connectivity status C of the i-th connection line of the upper section of each substation and the j-th line of the lower section is generated. k,ij , where the first-level substation only needs to determine the connectivity between the component and the next-level section line, and the last-level substation only needs to determine the connectivity of the previous-level section line, i∈[1,n], j∈[1,m], n is the number of connection lines of the previous-level section of the substation, m is the number of connection lines of the next-level section of the substation, and k is the substation level number; According to the connectivity status C k,ij Generate a power system substation connectivity matrix, wherein the power system substation connectivity matrix includes a connectivity matrix of a first-level substation, a connectivity matrix of a last-level substation, and a connectivity matrix of an intermediate-level substation; The connectivity status between the components in the substation and the system is calculated according to the connectivity matrix of the power system substation, and the AC section power failure judgment result is obtained.

2. The method for determining AC power failure in a power system according to claim 1, characterized in that: The calculation formula for calculating the connectivity status between the components in the substation and the system according to the connectivity matrix of the power system substation is: Among them, P is the connectivity status between the components in the station and the system, C k is the connectivity matrix of the k-th substation, and f is the total number of substations.

3. The method for determining power failure of AC section in power system according to claim 1, characterized in that: Also includes: Real-time detection of whether the power system status has changed, if so, return to recalculate the connectivity status C k,ij .

4. The method for determining power failure of AC section in power system according to claim 1, characterized in that: According to the upper section lines and lower section lines of each substation, the connectivity status C of the i-th connection line of the upper section of each substation and the j-th line of the lower section is generated. k,ij Previously, it also included: Check whether each substation has a non-section power failure or abnormal communication with the main station. If there is a substation with a non-section power failure or abnormal communication with the main station, the substation with the non-section power failure or abnormal communication with the main station will not participate in the connectivity judgment of the components and the system.

5. The method for determining power failure of AC section in power system according to claim 1, characterized in that: The connectivity matrix of the first-level substation is: C1=[C 1,11 ,…,C 1,1j ,…,C 1,1m ]。 6. The method for determining AC power failure in a power system according to claim 1, characterized in that: The connectivity matrix of the last substation is:

7. The method for determining AC power failure in a power system according to claim 1, characterized in that: The connectivity matrix of the intermediate substation is:

8. A power system AC section power failure identification system, characterized in that: include: The acquisition module is used to collect basic information of each substation in the power system, including topological information, bus information, loop information, switch information and protection action information of components in the substation, and determine the information of components that need to be judged for connection status with the system based on the basic information; The section line detection module is used to determine the AC section and connection line where the components in each substation are connected to the system according to the topological connection relationship between each substation; The section status detection module is used to generate the connectivity status C of the i-th connection line of the upper section and the j-th line of the lower section of each substation according to the upper section lines and lower section lines of each substation. k,ij , where the first-level substation only needs to determine the connectivity between the component and the next-level section line, and the last-level substation only needs to determine the connectivity of the previous-level section line, i∈[1,n], j∈[1,m], n is the number of connection lines of the previous-level section of the substation, m is the number of connection lines of the next-level section of the substation, and k is the substation level number; The connectivity matrix calculation module is used to calculate the connectivity matrix according to the connectivity state C k,ij Generate a power system substation connectivity matrix, wherein the power system substation connectivity matrix includes a connectivity matrix of a first-level substation, a connectivity matrix of a last-level substation, and a connectivity matrix of an intermediate-level substation; The component connectivity status detection module is used to calculate the connectivity status of the component and the system according to the power system substation connectivity matrix.

9. The AC section power failure identification system of the power system according to claim 8 is characterized in that: Also includes: The system status detection module is used to detect in real time whether the power system status has changed. If so, it returns to the section status detection module to recalculate the connectivity status C k,ij .

10. The AC section power failure identification system of the power system according to claim 8, characterized in that: Also includes: The fault detection module is used to generate the connectivity status C of the i-th connection line of the upper section and the j-th line of the lower section of each substation according to the upper section lines and lower section lines of each substation. k,ij Previously, each substation was checked to see if a non-section power failure or abnormal communication with the main station occurred. If there was a substation with a non-section power failure or abnormal communication with the main station, the substation with the non-section power failure or abnormal communication with the main station would not participate in the connectivity determination of the components and the system.

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