Method and device for positioning fault section of active power distribution network by using fault alarm information

Abstract

The invention relates to a method and a device for positioning a fault section of an active power distribution network by using unidirectional and bidirectional fault alarm information, the method is used for performing section positioning diagnosis after the fault of the active power distribution network, and the method comprises the following steps: after the fault of the active power distribution network occurs, according to the topology of the active power distribution network, determining the fault section of the active power distribution network; a mathematical model is constructed to calculate theoretical alarm information of the one-way fault indication device and the two-way fault indication device; according to the theoretical alarm information of the one-way fault indication device and the two-way fault indication device, whether the alarm information actually received by the power distribution master station is error alarm information is judged; establishing a fault section positioning mathematical model by taking identification difference degree minimization between a real fault scene and a fault scene reflected by the alarm information as a target function; and performing global optimal solution on the active power distribution network fault section positioning mathematical model to obtain the fault section of the active power distribution network. And rapid fault section positioning after multiple complex faults of the power distribution network connected with the multi-type distributed power supply is realized.

Description

Technical Field

[0001] The present invention relates to a method and a device for actively locating a fault section of a distribution network, and in particular to a method and a device for actively locating a fault section of a distribution network using single and double fault alarm information, and belongs to the technical field of power system operation and maintenance. Background Art

[0002] With the inevitable extreme disasters, the distribution system may have multiple complex faults. Accurately understanding the location of the fault section is a prerequisite for efficient maintenance tasks and helping distribution users to recover quickly. Therefore, accurate and rapid location of the fault section in the distribution system after a disaster is crucial to improving the subsequent self-healing and recovery capabilities of the distribution system.

[0003] There are many methods for fault section diagnosis in distribution networks, such as methods based on unidirectional fault information matrix, downstream marking methods of status information, and analysis methods based on unidirectional monitoring equipment alarms. However, these methods cannot achieve rapid fault section location when applied to distribution networks with multiple types of distributed power sources connected to multiple complex faults. Summary of the invention

[0004] The present invention mainly solves the deficiencies existing in the prior art and provides a method and device for actively locating the fault section of a distribution network by utilizing single and bidirectional fault alarm information to solve the technical problem in the related art that a distribution network with multiple types of distributed power sources connected cannot achieve rapid fault section positioning when there are multiple complex faults.

[0005] The above technical problems of the present invention are mainly solved by the following technical solutions:

[0006] A method for locating a fault section of an active distribution network using unidirectional and bidirectional fault alarm information, the method being used for performing section location diagnosis after a fault in the active distribution network, the method comprising:

[0007] After a fault occurs in the active distribution network, a mathematical model is constructed according to the topology of the active distribution network to calculate theoretical alarm information of a unidirectional fault indication device and a bidirectional fault indication device;

[0008] According to the theoretical alarm information of the one-way fault indication device and the two-way fault indication device, judging whether the alarm information actually received by the power distribution master station is an erroneous alarm information;

[0009] A mathematical model for fault section location is constructed with the objective function of minimizing the recognition difference between the real fault scenario and the fault scenario reflected by the alarm information;

[0010] A global optimal solution is obtained for the mathematical model for locating the fault section of the active distribution network to obtain the fault section of the active distribution network.

[0011] Preferably, after a fault occurs in the active distribution network, a mathematical model is constructed according to the topology of the active distribution network to calculate theoretical alarm information of a unidirectional fault indication device and a bidirectional fault indication device, specifically including:

[0012] According to the topology of the active power distribution network, determine the positive and negative directions of the alarm information of the fault indication device, and construct a positive direction section set and a reverse direction section set of the active power distribution network;

[0013] According to the topology of the active distribution network, a mathematical model for calculating theoretical alarm information of a fault indication device is constructed, specifically including a theoretical calculation mathematical model for alarm information of a bidirectional fault indication device and a theoretical calculation mathematical model for alarm information of a unidirectional fault indication device.

[0014] Preferably, judging whether the alarm information actually received by the power distribution master station is false alarm information according to the theoretical alarm information of the unidirectional fault indication device and the bidirectional fault indication device specifically includes:

[0015] Compare the alarm information of the one-way fault indication device and the two-way fault indication device actually received by the distribution master station with the theoretical alarm information calculated by the constructed mathematical model. If the two are consistent, the alarm information actually received is the correct alarm information; if the two are inconsistent, the alarm information actually received is the wrong alarm information. Through analysis, the wrong alarm information is divided into "missed alarm" and "false alarm".

[0016] According to the characteristic that the bidirectional fault indication device can detect the fault direction, the "false alarm" alarm information is further classified into "reverse" alarm information and "abnormal" alarm information, which are used to refer to the situation where the alarm information direction is wrong and there is actually no fault but the fault alarm information is uploaded;

[0017] For one-way fault indication devices, only "missed alarms" and "false alarms" of alarm information are considered.

[0018] "Missed alarm": This means that a fault actually occurred and the fault indication device should have uploaded a relevant alarm, but the distribution master station did not receive the relevant alarm.

[0019] "False alarm": This means that the fault did not actually occur and the fault indication device should not have uploaded the relevant alarm, but the distribution master station received the relevant alarm.

[0020] Preferably, a mathematical model for locating the fault section is constructed with the objective function of minimizing the recognition difference between the real fault scenario and the fault scenario reflected by the alarm information, specifically including:

[0021] By utilizing the alarm information of the one-way fault indication device and the two-way fault indication device actually received by the distribution master station and combining it with the theoretical alarm information of the one-way and two-way fault indication devices obtained through the mathematical model, the recognition difference between the real fault scenario and the fault scenario reflected by the alarm information is taken as the objective function to be minimized, and a mathematical model for locating the fault section of the active distribution network is constructed.

[0022] Preferably, performing a global optimal solution on the mathematical model for locating the fault section of the active distribution network to obtain the fault section of the active distribution network specifically includes:

[0023] The mathematical model for locating the fault section of the active distribution network is linearized into an optimization problem based on mixed integer linear programming, and a mature solution method is used to conveniently solve the global optimal solution to obtain the fault section of the active distribution network.

[0024] An active distribution network fault section location device using unidirectional and bidirectional fault alarm information, the device is used to perform section location diagnosis after an active distribution network fault, the device comprises:

[0025] A first construction module is used for constructing a mathematical model to calculate theoretical alarm information of a unidirectional fault indication device and a bidirectional fault indication device according to the topology of the active distribution network after a fault occurs in the active distribution network;

[0026] Classification module: used to determine whether the alarm information actually received by the power distribution master station is false alarm information according to the theoretical alarm information of the one-way fault indication device and the two-way fault indication device;

[0027] The second construction module is used to use the alarm information of the one-way fault indication device and the two-way fault indication device actually received by the power distribution master station, combined with the theoretical alarm information of the one-way and two-way fault indication devices obtained by the mathematical model, and take the recognition difference between the real fault scenario and the fault scenario reflected by the alarm information as the objective function to be minimized, so as to construct the fault section location mathematical model of the active distribution network;

[0028] The solution module is used to perform global optimal solution on the fault diagnosis mathematical model to obtain the fault section of the active power distribution network.

[0029] An electronic device is provided, comprising: one or more processors; a memory for storing one or more programs; when the one or more programs are executed by the one or more processors, the one or more processors implement the method described in the first aspect.

[0030] When the instruction is executed by the processor, the steps of the method described in the first aspect are implemented.

[0031] The present invention includes the following beneficial effects:

[0032] After a fault occurs in the active distribution network, the present application constructs a mathematical model to calculate the theoretical alarm information of the unidirectional fault indication device and the bidirectional fault indication device according to the topology of the active distribution network, and can determine the positive and negative directions of the alarm information of the fault indication device, and can provide a mathematical model of the theoretical alarm information of the bidirectional fault indication device and a method for calculating the theoretically correct alarm signal of the theoretical alarm information of the unidirectional fault indication device, so as to facilitate the subsequent correct judgment of the false alarm of the real fault monitoring device actually received by the dispatching center; according to the theoretical alarm information of the unidirectional fault indication device and the bidirectional fault indication device, it is judged whether the alarm information actually received by the distribution master station is false alarm information, and the bidirectional and unidirectional fault monitoring devices of the active distribution network can be comprehensively evaluated. The correctness of the alarm signal of the measuring device is determined and its specific error classification is judged; the mathematical model for locating the fault section is constructed with the objective function of minimizing the recognition difference between the real fault scenario and the fault scenario reflected by the alarm information, and the real bidirectional and unidirectional fault monitoring device alarm information actually received by the distribution master station is utilized, and the mathematical model of the theoretical alarm information of the fault indication device is combined to provide a method for locating the fault section of the active distribution network; the mathematical model for locating the fault section of the active distribution network is globally optimally solved to obtain the fault section of the active distribution network, and its beneficial effect is that the global optimal solution can be obtained by using a method that can solve linear programming problems, avoiding the local optimality of the solution obtained by using a heuristic method. The present invention can overcome the defect of the technical problem that other existing active distribution networks with multiple types of distributed power sources connected cannot realize rapid fault section positioning when multiple complex faults occur. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a flow chart of the present invention;

[0034] Figure 2 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0035] The technical solution of the present invention is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0036] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0037] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms of "a", "said" and "the" used in this application and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0038] Example 1: Reference Figure 1 The embodiment of the present invention provides a method for locating a fault section of an active distribution network using unidirectional and bidirectional fault alarm information. The method is used to perform section location diagnosis after a fault in the active distribution network. The method includes:

[0039] Step S101, after a fault occurs in the active distribution network, a mathematical model is constructed according to the topology of the active distribution network to calculate theoretical alarm information of a unidirectional fault indication device and a bidirectional fault indication device;

[0040] Step S102, judging whether the alarm information actually received by the power distribution master station is false alarm information according to the theoretical alarm information of the one-way fault indication device and the two-way fault indication device;

[0041] Step S103, constructing a mathematical model for locating the fault section with the objective function of minimizing the recognition difference between the real fault scenario and the fault scenario reflected by the alarm information;

[0042] Step S104, performing global optimal solution on the mathematical model for locating the fault section of the active distribution network to obtain the fault section of the active distribution network.

[0043] In the above step S101, after a fault occurs in the active distribution network, a mathematical model is constructed according to the topology of the active distribution network to calculate theoretical alarm information of a unidirectional fault indication device and a bidirectional fault indication device, specifically including:

[0044] According to the topology of the active power distribution network, the positive and negative directions of the alarm information of the fault indication device are determined, and a positive direction section set and a reverse direction section set of the active power distribution network are constructed.

[0045] When there are no multiple types of distributed power sources connected to the distribution network, the flow direction of each node in the non-fault operation state is related to the output of each power source and the node load demand. The flow direction is generally a single flow direction from the substation to the distribution load at the end of the feeder. This single flow direction is defined as the basic flow direction.

[0046] When the distribution network is connected to multiple types of distributed power sources, when a fault occurs in the distribution network, since each distributed power source can also provide power to the distribution load, the power flow in the distribution system will become bidirectional. A method for defining the positive and negative directions of the alarm information of a bidirectional fault indication device is proposed. The positive direction segment and the reverse direction segment are used to distinguish the positive and reverse directions of the alarm information. That is, if a single fault occurs in the positive direction segment of a bidirectional fault indication device, the alarm information correctly sent by this bidirectional fault indication device should be in the positive direction; conversely, if a single fault occurs in the reverse direction segment of a bidirectional fault indication device, the alarm information correctly sent by this bidirectional fault indication device should be in the reverse direction. The set of positive direction segments of the bidirectional fault indication device is denoted as The reverse direction section is recorded as Then for the bidirectional fault indication device installed at node i, and The elements in have the following characteristics:

[0047] 1) When the positive direction section ( When a single fault occurs in the element, the fault current generated by the distribution system containing distributed generation will flow through node i in the same direction as the basic power flow direction;

[0048] 2) When the reverse direction section of the bidirectional fault indication device of node i ( When a single fault occurs in the element (i), the fault current generated by the distribution system containing distributed generation will flow through node i in the direction opposite to the basic power flow direction.

[0049] According to the topology of the active distribution network, a mathematical model for calculating theoretical alarm information of a fault indication device is constructed, specifically including a theoretical calculation mathematical model for alarm information of a bidirectional fault indication device and a theoretical calculation mathematical model for alarm information of a unidirectional fault indication device.

[0050] Mathematical model for calculating theoretical alarm information of bidirectional fault indication device:

[0051] The actual alarm information uploaded by ORF Ii installed on node i (i.e. ) may have three alarm states: no alarm triggered, positive alarm triggered, and reverse alarm triggered, represented by values ​​0, +1, and -1 respectively. The theoretical alarm information function of the bidirectional fault indication device (denoted as F i ) is also set to {0, +1, -1}, it can be compared with the actual alarm information The theoretical alarm information function F of the bidirectional fault indication device is proposed. i , specifically described as follows:

[0052]

[0053] Where: i is the index of the node where the bidirectional fault indication device is located; Ψ O It is a set of nodes equipped with bidirectional fault indication devices; 0-1 variable F i L,pos and F i L,neg Indicates whether ORFI-i triggers a forward alarm or a reverse alarm. Specifically: i L,pos =1, otherwise F i L,pos =0; when the reverse alarm is triggered, F i L,neg =1, otherwise F i L,neg =0; when the alarm is not triggered, F i L,pos =F i L,neg =0.

[0054] 0-1 variable F indicating whether ORFI-i triggers a forward alarm or a reverse alarm i L,pos and F i L,neg The further constraints are as follows:

[0055] Where: and It represents the number of power sources that can provide positive and reverse fault currents to ORF Ii; M is a sufficiently large positive number.

[0056] Considering the intermittent nature of the output power of distributed power sources, the power output status of each distributed power source needs to be considered to accurately determine the number of power sources that can provide fault current, so as to accurately determine the number of power sources that can provide positive and reverse fault current to ORF Ii ( and ) is constrained as follows:

[0057]

[0058] Where: n is the index of the node where the distributed power source is located; 0-1 variable Indicates whether DER-n is currently supplying power to the distribution system when a fault occurs. otherwise and Represent the positive direction segment of ORF Ii and reverse direction section The set of nodes contained in; 0-1 variable Indicates whether a fault has occurred on the feeder section between ORF II and the substation. otherwise 0-1 variables and Indicates whether a fault occurs in the forward and reverse sections of ORFI-i: If a fault occurs in the forward section of ORF Ii, then otherwise If a fault occurs in the reverse section of ORF II, otherwise

[0059] The above three 0-1 variables indicate the relationship between the ORF II installation location and the fault section location The constraints are expressed as follows:

[0060]

[0061] Where: l is the index of the feeder section; L is the vector of the fault status of all feeder sections separated by the fault indication device on the feeder, and the elements are all 0-1 variables. When a section fails, the corresponding element in L is 1, otherwise the corresponding element in L is 0; is the set of feeder sections between the substation and ORF Ii; 0-1 variable S i,l , P i,n,l and N i,n,l The vector S i , P i,n and N i,n The elements in are all judgments An intermediate variable that takes a value; M is a sufficiently large positive number.

[0062] Mathematical model for calculating theoretical alarm information of one-way fault indication device:

[0063] The actual alarm information that the one-way fault indication device can upload (still recorded as ) There are only two types: no alarm is triggered and the alarm in the predetermined direction is triggered, which are represented by the values ​​0 and 1 respectively. The theoretical alarm information function F of the one-way fault indication device i The value range is {0,1}. The theoretical alarm information function F of the one-way fault indication device is proposed i The statement is as follows:

[0064] Where: and It represents the number of power sources that can provide positive and reverse fault currents to ORF Ii; M is a sufficiently large positive number; Ψ N Represents the collection of nodes equipped with unidirectional fault indication devices.

[0065] The constraints in the theoretical alarm information model of the unidirectional fault indication device are the same as the constraints in the theoretical alarm information model of the bidirectional fault indication device.

[0066] In the above step S102, judging whether the alarm information actually received by the power distribution master station is an erroneous alarm information according to the theoretical alarm information of the unidirectional fault indication device and the bidirectional fault indication device specifically includes:

[0067] Compare the alarm information of the one-way fault indication device and the two-way fault indication device actually received by the distribution master station with the theoretical alarm information calculated by the constructed mathematical model. If the two are consistent, the alarm information actually received is the correct alarm information; if the two are inconsistent, the alarm information actually received is the wrong alarm information. Through analysis, the wrong alarm information is divided into "missed alarm" (that is, the fault actually occurred, the fault indication device should have uploaded the relevant alarm, but the distribution master station did not receive the relevant alarm) and "false alarm" (that is, the fault did not actually occur, the fault indication device should not have uploaded the relevant alarm, but the distribution master station received the relevant alarm).

[0068] According to the characteristic that the bidirectional fault indication device can detect the fault direction, the "false alarm" alarm information is further classified into "reverse" alarm information and "abnormal" alarm information, which are used to refer to the situations where the alarm information direction is wrong and there is actually no fault but the fault alarm information is uploaded.

[0069] The unreliable alarm information of the bidirectional fault indication device can be divided into the following three types: 1) Missing alarm information: F = 0 but F A = +1 or -1; 2) Changes in alarm information: F = +1 or -1, but F A =0; 3) Reverse of alarm information: F = +1 but F A = -1, or F = -1 but F A = +1, that is, F·F A =-1.

[0070] The number of unreliable alarm messages of the bidirectional fault indication device of node i is FA ORFI The statement is as follows:

[0071]

[0072] Where: 0-1 variable M i , D i and R iRespectively indicate the alarm information received by the distribution master station (i.e. ) Whether it is unreliable alarm information of missed report, abnormal change and reverse direction: When the alarm information is missed i =1, otherwise M i =0; when When it is a mutation alarm message i =1, otherwise D i =0; when When it is a reverse alarm message R i =1, otherwise R i =0; when If it is a reliable alarm message, M i =R i =D i =0;Ψ O It is a collection of nodes equipped with a bidirectional fault indication device.

[0073] A 0-1 variable M indicating whether the alarm information sent by the bidirectional fault indication device received by the power distribution master station is an unreliable alarm of missed alarm and abnormal change. i and D i The linearization constraints are as follows:

[0074] Where x i ,y i and z i They all represent 0-1 intermediate variables introduced for linearization.

[0075] A 0-1 variable R indicating whether the alarm sent by the bidirectional fault indication device received by the distribution master station is a reverse unreliable alarm i The linearization constraints are as follows:

[0076] For one-way fault indication devices, only "missed alarms" and "false alarms" of alarm information are considered.

[0077] There are only two types of unreliable alarm information of the one-way fault indication device: 1) Missing alarm information: F = 0 but F A = +1 or -1; 2) Changes in alarm information: F = +1 or -1, but F A =0.

[0078] The number of unreliable alarm messages of the one-way fault indication device at node i FA NRFI The statement is as follows:

[0079]

[0080] Where: N Represents the collection of nodes equipped with unidirectional fault indication devices.

[0081] A 0-1 variable M indicating whether the alarm sent by the one-way fault indication device received by the power distribution master station is an unreliable alarm of missed alarm and abnormal change. i and D i The linearization constraints are as follows:

[0082] In the above step S103, a mathematical model for locating the fault section is constructed with the objective function of minimizing the recognition difference between the real fault scenario and the fault scenario reflected by the alarm information, which specifically includes:

[0083] The recognition difference between the real fault scenario and the fault scenario reflected by the alarm information is taken as the objective function to be minimized, denoted as FA, which is expressed as follows:

[0084] min FA=FA ORFI +FA NRFI FA in the formula ORFI and FA NRFI Represents the number of unreliable alarms related to bidirectional fault indication devices and unidirectional fault indication devices respectively.

[0085] The mathematical model for locating the fault section of the active distribution network is constructed by using the real bidirectional and unidirectional fault monitoring device alarm information actually received by the distribution master station and combining the mathematical model of the theoretical alarm information of the fault indication device in step S101 and step S102.

[0086] In the above step S104, the global optimal solution is performed on the mathematical model for locating the fault section of the active distribution network to obtain the fault section of the active distribution network, which specifically includes:

[0087] The mathematical model for locating the fault section of the active distribution network is linearized into an optimization problem based on mixed integer linear programming, and a mature solution method is used to conveniently solve the global optimal solution to obtain the fault section of the active distribution network.

[0088] Corresponding to the aforementioned embodiment of a method for actively locating a fault section of a distribution network using unidirectional and bidirectional fault alarm information, the present application also provides an embodiment of a device for actively locating a fault section of a distribution network using unidirectional and bidirectional fault alarm information.

[0089] Reference Figure 2 The device is used to perform section location diagnosis after an active distribution network fault, and the device includes:

[0090] A first construction module 21 is used to construct a mathematical model to calculate theoretical alarm information of a unidirectional fault indication device and a bidirectional fault indication device according to the topology of the active distribution network after a fault occurs in the active distribution network;

[0091] A classification module 22, used to determine whether the alarm information actually received by the power distribution master station is false alarm information based on the theoretical alarm information of the one-way fault indication device and the two-way fault indication device;

[0092] The second construction module 23 is used to use the alarm information of the one-way fault indication device and the two-way fault indication device actually received by the power distribution master station, combined with the theoretical alarm information of the one-way and two-way fault indication devices obtained by the mathematical model, and take the recognition difference between the real fault scenario and the fault scenario reflected by the alarm information as the objective function to be minimized, so as to construct the fault section location mathematical model of the active distribution network;

[0093] The solution module 24 is used to perform global optimal solution on the fault diagnosis mathematical model to obtain the fault section of the active power distribution network.

[0094] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0095] For the device embodiment, since it basically corresponds to the method embodiment, the relevant parts can refer to the partial description of the method embodiment. The device embodiment described above is only schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present application scheme. A person of ordinary skill in the art can understand and implement it without paying any creative work.

[0096] Correspondingly, the present application also provides an electronic device, comprising: one or more processors; a memory for storing one or more programs; when the one or more programs are executed by the one or more processors, the one or more processors implement a method for actively locating a fault section of a distribution network using unidirectional and bidirectional fault alarm information as described above.

[0097] Correspondingly, the present application also provides a computer-readable storage medium on which computer instructions are stored. When the instructions are executed by a processor, a method for actively locating a fault section of a distribution network using unidirectional and bidirectional fault alarm information as described above is implemented.

[0098] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the disclosure disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0099] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A method for actively locating fault sections in a distribution network using unidirectional and bidirectional fault alarm information, characterized in that: The method is used to perform section location diagnosis after an active distribution network fault occurs. The method comprises: After a fault occurs in the active distribution network, a mathematical model is constructed according to the topology of the active distribution network to calculate theoretical alarm information of a unidirectional fault indication device and a bidirectional fault indication device; According to the theoretical alarm information of the one-way fault indication device and the two-way fault indication device, judging whether the alarm information actually received by the power distribution master station is an erroneous alarm information; A mathematical model for fault section location is constructed with the objective function of minimizing the recognition difference between the real fault scenario and the fault scenario reflected by the alarm information; A global optimal solution is obtained for the mathematical model for locating the fault section of the active distribution network to obtain the fault section of the active distribution network.

2. The method for locating fault sections of an active distribution network using unidirectional and bidirectional fault alarm information according to claim 1, characterized in that: After a fault occurs in the active distribution network, a mathematical model is constructed according to the topology of the active distribution network to calculate theoretical alarm information of a unidirectional fault indication device and a bidirectional fault indication device, specifically including: According to the topology of the active power distribution network, determine the positive and negative directions of the alarm information of the fault indication device, and construct a positive direction section set and a reverse direction section set of the active power distribution network; According to the topology of the active distribution network, a mathematical model for calculating theoretical alarm information of a fault indication device is constructed, specifically including a theoretical calculation mathematical model for alarm information of a bidirectional fault indication device and a theoretical calculation mathematical model for alarm information of a unidirectional fault indication device.

3. The method for locating fault sections of an active distribution network using unidirectional and bidirectional fault alarm information according to claim 1, characterized in that: According to the theoretical alarm information of the one-way fault indication device and the two-way fault indication device, judging whether the alarm information actually received by the power distribution master station is an erroneous alarm information specifically includes: Compare the alarm information of the one-way fault indication device and the two-way fault indication device actually received by the distribution master station with the theoretical alarm information calculated by the constructed mathematical model. If the two are consistent, the alarm information actually received is the correct alarm information; if the two are inconsistent, the alarm information actually received is the wrong alarm information. Through analysis, the wrong alarm information is divided into "missed alarm" and "false alarm". According to the characteristic that the bidirectional fault indication device can detect the fault direction, the "false alarm" alarm information is further classified into "reverse" alarm information and "abnormal" alarm information, which are used to refer to the situation where the alarm information direction is wrong and the situation where there is no fault but the fault alarm information is uploaded; For one-way fault indication devices, only "missed alarm" and "false alarm" of alarm information are considered.

4. The method for locating fault sections of an active distribution network using unidirectional and bidirectional fault alarm information according to claim 1, characterized in that: The mathematical model for fault section location is constructed with the objective function of minimizing the recognition difference between the real fault scenario and the fault scenario reflected by the alarm information, which specifically includes: By utilizing the alarm information of the one-way fault indication device and the two-way fault indication device actually received by the distribution master station and combining it with the theoretical alarm information of the one-way and two-way fault indication devices obtained through the mathematical model, the recognition difference between the real fault scenario and the fault scenario reflected by the alarm information is taken as the objective function to be minimized, and a mathematical model for locating the fault section of the active distribution network is constructed.

5. The method for actively locating a fault section of a power distribution network using unidirectional and bidirectional fault alarm information according to claim 1, characterized in that: The globally optimal solution of the mathematical model for locating the fault section of the active distribution network is performed to obtain the fault section of the active distribution network, which specifically includes: The mathematical model for locating the fault section of the active distribution network is linearized into an optimization problem based on mixed integer linear programming, and a mature solution method is used to conveniently solve the global optimal solution to obtain the fault section of the active distribution network.

6. An active distribution network fault section locating device using unidirectional and bidirectional fault alarm information, the active distribution network fault section locating device using the active distribution network fault section locating method according to any one of claims 1 to 5, characterized in that: The device is used to perform section location diagnosis after an active distribution network fault occurs. The device includes: A first construction module is used for constructing a mathematical model to calculate theoretical alarm information of a unidirectional fault indication device and a bidirectional fault indication device according to the topology of the active distribution network after a fault occurs in the active distribution network; Classification module: used to determine whether the alarm information actually received by the power distribution master station is false alarm information according to the theoretical alarm information of the one-way fault indication device and the two-way fault indication device; The second construction module is used to use the alarm information of the one-way fault indication device and the two-way fault indication device actually received by the power distribution master station, combined with the theoretical alarm information of the one-way and two-way fault indication devices obtained by the mathematical model, and take the recognition difference between the real fault scenario and the fault scenario reflected by the alarm information as the objective function to be minimized, so as to construct the fault section location mathematical model of the active distribution network; The solution module is used to perform global optimal solution on the fault diagnosis mathematical model to obtain the fault section of the active power distribution network.

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