Feeder fault self-healing method and apparatus, terminal device, and storage medium

Abstract

Disclosed in the present invention are a feeder fault self-healing method and apparatus, a terminal device, and a storage medium. On the basis of opening / closing signals, blocking signals and position information of several switches mounted on a faulty feeder, a faulty feeder model is constructed; then, on the basis of the faulty feeder model, a terminal overcurrent switch that has tripped and is located at the farthest end of the faulty feeder is determined; and then, on the basis of the open / closed state of the terminal overcurrent switch, a fault upstream boundary switch and a fault downstream boundary switch are determined, such that a fault region is accurately positioned on the basis of the fault upstream boundary switch and the fault downstream boundary switch. Therefore, in the present invention, fault positioning is no longer based solely on the open / closed states and blocking states of voltage-time switches; instead, in view of the topological relationships, open / closed states and blocking states of the switches on the faulty feeder, the fault region is accurately positioned, and feeder self-healing is completed, thereby effectively improving power supply reliability.

Description

A method, apparatus, terminal equipment, and storage medium for self-healing of feeder faults. Technical Field

[0001] This invention relates to the field of smart distribution network technology, and in particular to a method, apparatus, terminal equipment, and storage medium for self-healing of feeder faults. Background Technology

[0002] "Voltage-time type" feeder automation is achieved through the switching characteristics of "no-voltage opening and delayed closing upon power restoration" in conjunction with the secondary closing of the substation outgoing line switch. The primary closing isolates the faulty section, and the secondary closing restores power to the non-faulty section. When the feeder line is long, the number of switch opening and closing operations is high, and the power outage area is large, resulting in long operating times and a greater impact on the load.

[0003] Therefore, for long lines, a combination of circuit breakers and load switches is generally used. Circuit breakers divide the line into multiple sections. When a fault occurs on a feeder, the circuit breaker with differential protection trips nearby, preventing a power outage along the entire feeder. This, combined with voltage-time type load switches, quickly isolates the upstream area of ​​the fault. Specifically, the actions of the circuit breaker and load switch during a short-circuit fault are as follows: the differential circuit breaker's instantaneous overcurrent protection trips, and the load switch on the line trips due to voltage loss. After a reclosing delay, the circuit breaker recloses for the first time, and the switches along the line close sequentially according to the energization sequence. If the fault is transient, the line returns to normal operation. If the fault is permanent, when the load switch closes at the fault point, the differential circuit breaker's instantaneous overcurrent protection trips, the load switch trips due to voltage loss, and the switches before and after the fault point are automatically locked in the open state. After a further period, the outgoing circuit breaker closes for the second time, restoring power to the non-faulty area upstream of the fault section.

[0004] The current mixed layout of circuit breakers and voltage-time switches in network architecture, based on the fault location method using X-time and Y-time blocking signals of voltage-time switches, easily leads to a fault location range larger than the actual fault area. The specific fault location logic is as follows: During circuit breaker reclosing, if a voltage-time switch encounters a fault after closing, resulting in a loss of voltage, and fails to re-energize and close within the set X-time limit, then X-time blocking is triggered. This means the fault point is after this switch. If a voltage-time switch was already closed before the fault, but lost voltage and automatically tripped within a certain time (Y-time limit) after the fault occurred, then Y-time blocking is triggered. This usually indicates the fault point is before or adjacent to this switch. Circuit breaker tripping causes a voltage drop across the entire line or part of the line, which in turn triggers the undervoltage tripping and blocking logic of voltage-time switches in non-faulty areas, resulting in a fault location range larger than the actual fault area. Consequently, during subsequent fault isolation, non-faulty areas are frequently incorrectly isolated, severely impacting power supply stability. Summary of the Invention

[0005] This invention provides a feeder fault self-healing method, device, terminal equipment, and storage medium. By combining the topological relationship, on / off status, and lockout status of each switch on the faulty feeder, the method can accurately locate the fault area and complete the feeder self-healing, effectively improving power supply reliability.

[0006] An embodiment of the present invention provides a feeder fault self-healing method, characterized in that it includes:

[0007] When confirming the completion of the upstream isolation operation of the faulty feeder, acquire the opening and closing signals, blocking signals, and position information of several switches installed on the faulty feeder;

[0008] Based on the opening and closing signals and the location information, a fault feeder model is constructed; wherein, the fault feeder model records the types, opening and closing states, and topological connections of several switches mounted on the fault feeder;

[0009] Based on the fault feeder model, the end overcurrent switch located at the upstream end of the fault is identified, and it is determined whether the end overcurrent switch is in the open state.

[0010] If so, the terminal overcurrent switch is determined to be the upstream fault boundary switch, and the adjacent switch located downstream of the upstream fault boundary switch and participating in the upstream fault isolation operation is designated as the downstream fault boundary switch.

[0011] If not, if it is determined that there is only one blocking signal, locate the target voltage time-type switch corresponding to the blocking signal;

[0012] When it is determined, based on the fault feeder model, that there is no switch in the open state upstream of the target voltage time-type switch, the target voltage time-type switch is identified as the fault upstream boundary switch, and the switch located downstream of and adjacent to the fault upstream boundary switch is identified as the fault downstream boundary switch.

[0013] The area between the upstream boundary switch and the downstream boundary switch is defined as the fault zone. Then, based on the upstream boundary switch and the downstream boundary switch, the downstream fault is isolated, and power supply to the non-faulty area is restored.

[0014] Furthermore, the step of isolating the downstream area of ​​the fault and restoring power supply to the non-faulty area based on the upstream fault boundary switch and the downstream fault boundary switch includes:

[0015] When it is determined that the upstream boundary switch of the fault is a differential circuit breaker in the open state and the downstream boundary switch of the fault is a differential circuit breaker in the closed state, the downstream boundary switch of the fault is controlled to open, and the ring network switch on the fault feeder is controlled to close.

[0016] Based on the fault feeder model, determine whether there is a first voltage-time type switch that issues a blocking signal in the power supply line downstream of the fault downstream boundary switch.

[0017] When the presence of the first voltage time-type switch is confirmed, the first voltage time-type switch is controlled to close.

[0018] Furthermore, the step of isolating the downstream area of ​​the fault and restoring power supply to the non-faulty area based on the upstream fault boundary switch and the downstream fault boundary switch includes:

[0019] When it is determined that the upstream boundary switch of the fault is a differential circuit breaker in the open state and the downstream boundary switch of the fault is a load switch in the open state, it is determined whether the downstream boundary switch of the fault issues a blocking signal according to the fault feeder model.

[0020] If so, then control the ring network switch on the faulty feeder to close;

[0021] If not, the downstream boundary switch of the fault is controlled to close and then open sequentially, and then the ring network switch on the fault feeder is controlled to close, so that the downstream boundary switch of the fault is locked and the fault area is isolated.

[0022] Furthermore, the step of isolating the downstream area of ​​the fault and restoring power supply to the non-faulty area based on the upstream fault boundary switch and the downstream fault boundary switch includes:

[0023] When the target voltage time-type switch is determined to be the upstream boundary switch of the fault, it is determined whether the downstream boundary switch of the fault is a differential circuit breaker.

[0024] If so, control the downstream boundary switch of the fault to open and control the ring network switch on the fault feeder to close.

[0025] If not, the downstream boundary switch of the fault is controlled to close and then open sequentially, and then the ring network switch on the fault feeder is controlled to close, so that the downstream boundary switch of the fault is locked and the fault area is isolated.

[0026] Furthermore, the feeder fault self-healing method described in the above embodiments further includes:

[0027] When it is determined that the end overcurrent switch is in the closed state and there is more than one blocking signal, it is determined that the fault area has been isolated by the voltage-time type switches located upstream and downstream of the fault, and the ring network switch on the fault feeder is controlled to close.

[0028] Furthermore, the feeder fault self-healing method described in the above embodiments further includes:

[0029] When it is determined that the end overcurrent switch is in the closed state and there is no blocking signal, it is determined that the faulty feeder cannot complete the fault isolation and power supply to the non-faulty area through the feeder self-healing operation, and the self-healing operation is blocked.

[0030] When it is determined that there is a switch in the open state upstream of the target voltage time-type switch, it is determined that the faulty feeder cannot complete the fault isolation and power supply to the non-faulty area through the feeder self-healing operation, and the self-healing operation is blocked.

[0031] Another embodiment of the present invention provides a feeder fault self-healing device, comprising:

[0032] The signal acquisition module is used to acquire the opening and closing signals, blocking signals, and position information of several switches loaded on the faulty feeder when the upstream isolation operation of the faulty feeder is completed.

[0033] The model building module is used to construct a fault feeder model based on the opening and closing signals and the location information; wherein, the fault feeder model records the types, opening and closing states, and topological connections of several switches mounted on the fault feeder.

[0034] The switch determination module is used to determine the end overcurrent switch located at the far end of the upstream of the fault based on the fault feeder model, and to determine whether the end overcurrent switch is in the open state.

[0035] The first fault location module is used to determine, if yes, the end overcurrent switch as the fault upstream boundary switch, and to designate the adjacent switch located downstream of the fault upstream boundary switch and participating in the fault upstream isolation operation as the fault downstream boundary switch.

[0036] The second fault location module is used to locate the target voltage time-type switch corresponding to the blocking signal if, in the case that there is only one blocking signal, the target voltage time-type switch is identified as the upstream boundary switch of the fault, and the switch located downstream and adjacent to the upstream boundary switch of the fault is identified as the downstream boundary switch of the fault.

[0037] The fault self-healing module is used to determine the area between the upstream fault boundary switch and the downstream fault boundary switch as the fault interval, and then isolate the downstream fault according to the upstream fault boundary switch and the downstream fault boundary switch, and restore power supply to the non-fault area.

[0038] Furthermore, the step of isolating the downstream area of ​​the fault and restoring power supply to the non-faulty area based on the upstream fault boundary switch and the downstream fault boundary switch includes:

[0039] When it is determined that the upstream boundary switch of the fault is a differential circuit breaker in the open state and the downstream boundary switch of the fault is a differential circuit breaker in the closed state, the downstream boundary switch of the fault is controlled to open, and the ring network switch on the fault feeder is controlled to close.

[0040] Based on the fault feeder model, determine whether there is a first voltage-time type switch that issues a blocking signal in the power supply line downstream of the fault downstream boundary switch.

[0041] When the presence of the first voltage time-type switch is confirmed, the first voltage time-type switch is controlled to close.

[0042] Another embodiment of the present invention provides a terminal device including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor executes the computer program to implement a feeder fault self-healing method as described in any of the embodiments.

[0043] Another embodiment of the present invention provides a storage medium including a stored computer program, wherein, when the computer program is executed, it controls the device where the storage medium is located to perform a feeder fault self-healing method as described in any of the above embodiments.

[0044] The following benefits can be obtained by implementing the present invention:

[0045] This invention discloses a feeder fault self-healing method, apparatus, terminal equipment, and storage medium. The method constructs a fault feeder model based on the opening and closing signals, blocking signals, and location information of several switches mounted on the fault feeder. Then, based on the fault feeder model, it identifies the terminal overcurrent switch that has tripped and is located at the very end of the fault feeder. Furthermore, based on the opening and closing status of the terminal overcurrent switch, it identifies the upstream and downstream boundary switches of the fault. This allows for precise location of the fault area based on the upstream and downstream boundary switches. Therefore, this invention no longer relies solely on the opening and closing status and blocking status of voltage-time switches for fault location, but combines the topological relationship, opening and closing status, and blocking status of each switch on the fault feeder to accurately locate the fault area and complete feeder self-healing. This effectively avoids the situation where voltage-time switches are mistakenly triggered due to undervoltage tripping and blocking, leading to an expansion of the fault location range, and effectively improves power supply reliability. Attached Figure Description

[0046] Figure 1 is a flowchart illustrating a feeder fault self-healing method according to an embodiment of the present invention.

[0047] Figure 2 is a schematic diagram of a feeder fault self-healing device provided in an embodiment of the present invention.

[0048] Figure 3 is a schematic diagram of the structure of a feeder during normal operation according to an embodiment of the present invention.

[0049] Figure 4 is a flowchart of the operation of each switch when a feeder fails, according to an embodiment of the present invention.

[0050] Figure 5 is another operation flowchart of each switch when a feeder fails, according to an embodiment of the present invention. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0053] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0054] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0055] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0056] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0057] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0058] Referring to Figure 1, it is a schematic flowchart of a feeder fault self-healing method provided in an embodiment of the present invention, including:

[0059] S1. When the upstream isolation operation of the faulty feeder is completed, obtain the opening and closing signals, blocking signals, and position information of several switches loaded on the faulty feeder.

[0060] In a preferred embodiment of the present invention, initially, the switches are automatically classified into two types based on the type of switches installed in the distribution network: differential circuit breakers and load switches. It should be noted that voltage-time type switches are a type of load switch. Subsequently, the binding of protection information, blocking signals, and switching equipment is completed. When it is determined that the upstream isolation operation of the fault feeder has been completed, the opening and closing signals, blocking signals, and position information of the switches during the fault period are acquired.

[0061] Figure 3 shows the faulty feeder model when no fault occurs. As shown in Figure 4, a and b represent the process by which the feeder autonomously isolates the upstream fault when a fault occurs between switches K2 and K3. Specifically, when a fault occurs between switches K2 and K3, K1 trips, K2 and K3 lose voltage and open, K1 recloses, K2 is energized and closes, causing faulty K1 to trip again, K2 loses power and opens and is locked, and K1 closes to restore power supply to the upstream fault.

[0062] S2. Construct a fault feeder model based on the opening and closing signals and the position information; wherein, the fault feeder model records the types, opening and closing states, and topological connections of several switches mounted on the fault feeder.

[0063] In a preferred embodiment of the present invention, based on the connection relationships between these switches and the opening and closing signals of the switches during a fault, non-disconnecting devices such as feeder sections and faulty circuit breakers, as well as disconnecting devices such as switches, disconnectors, and fuses that do not affect the self-healing topology, are eliminated. A fault feeder model, as shown in Figures 3 and 4, is then established, extending from the substation outgoing switch power supply side to each backup power supply side and each branch line. It is understood that by identifying and filtering unnecessary equipment parameters and reducing the size of the equipment memory model, the efficiency of fault analysis and processing can be effectively improved.

[0064] It should be noted that, as mentioned later, upstream refers to the direction from which the switch points to the power supply side, and downstream refers to the direction from which the power supply extends towards the end.

[0065] S3. Based on the fault feeder model, determine the end overcurrent switch located at the far end of the upstream fault, and determine whether the end overcurrent switch is in the open state.

[0066] In a preferred embodiment of the present invention, as shown in FIG4, after the upstream power supply is restored to the faulty feeder, the end overcurrent switch located at the far end of the upstream of the fault is switch K1.

[0067] It should be noted that this embodiment constructs an adjacency matrix based on the established fault feeder model, and searches for the end-of-line overcurrent switch based on the adjacency matrix. Based on the received fault protection signals and opening / closing information of the differential switch and voltage-time switch, and considering the feeder's energized topology and power supply relationship, the search is traversed using depth-first and breadth-first algorithms, exploring the branches of the search tree as deeply as possible. When all edges containing a node have been explored, the search backtracks to the starting node of the edge where the node was found, and finally, the end-of-line overcurrent switch is determined through analysis.

[0068] S4. If so, the terminal overcurrent switch is determined to be the upstream fault boundary switch, and the adjacent switch located downstream of the upstream fault boundary switch and participating in the upstream fault isolation operation is designated as the downstream fault boundary switch.

[0069] In a preferred embodiment of the present invention, if the end overcurrent switch is currently in the open state, it can be determined that the end overcurrent switch is a differential switch and that the end overcurrent switch is the upstream boundary of the fault. Based on the equipment topology and power supply relationship of the line, a depth-first algorithm is used to find the first switch downstream of the end overcurrent switch that participates in the upstream fault isolation operation and is designated as the downstream fault switch.

[0070] S5. If not, if it is determined that there is only one blocking signal, locate the target voltage time-type switch corresponding to the blocking signal;

[0071] S6. When it is determined, based on the fault feeder model, that there is no switch in the open state upstream of the target voltage time-type switch, the target voltage time-type switch is identified as the fault upstream boundary switch, and the switch located downstream of and adjacent to the fault upstream boundary switch is identified as the fault downstream boundary switch.

[0072] In a preferred embodiment of the present invention, as shown in FIG4, the end overcurrent switch K1 is in the closed state, and after K2 is energized and closed, causing the fault K1 to trip again, K2 is de-energized, opens and is locked. Therefore, at this time there is only one lockout signal issued by K2, and there is no switch in the open state upstream of K2. Therefore, K2 is determined to be the fault upstream boundary switch. The search continues from the upstream equipment downwards, and the fault downstream boundary switch K3 is found through traversal.

[0073] S7. The area between the upstream fault boundary switch and the downstream fault boundary switch is determined as the fault interval. Then, based on the upstream fault boundary switch and the downstream fault boundary switch, the downstream fault is isolated, and the power supply to the non-fault area is restored.

[0074] Preferably, the step of isolating the downstream fault and restoring power supply to the non-faulty area based on the upstream fault boundary switch and the downstream fault boundary switch includes:

[0075] S71. When it is determined that the upstream boundary switch of the fault is a differential circuit breaker in the open state and the downstream boundary switch of the fault is a differential circuit breaker in the closed state, the downstream boundary switch of the fault is controlled to open, and the ring network switch on the fault feeder is controlled to close.

[0076] S72. Based on the fault feeder model, determine whether there is a first voltage-time type switch that issues a blocking signal in the power supply line downstream of the fault downstream boundary switch.

[0077] S73. When it is determined that the first voltage time-type switch exists, control the first voltage time-type switch to close.

[0078] In a preferred embodiment of the present invention, based on the determined fault downstream boundary switch, the current position status and switch type of the fault downstream boundary switch are obtained. If the fault downstream boundary switch is in the closed state and is a circuit breaker, then based on all the terminal signals on the obtained fault feeder, it is analyzed whether there is a blocking signal of the first voltage time type switch on the downstream power supply line of the fault downstream boundary switch.

[0079] If a blocking signal from the first voltage-time type switch exists downstream of the fault's downstream boundary switch, the determined fault's downstream boundary switch is remotely disconnected to complete the isolation operation downstream of the fault. The ring network switch is then closed, and the first voltage-time type switch that generated the blocking signal is remotely closed. Because this switch is already blocked, closing the ring network switch will not energize and close the first voltage-time type switch. Power is restored to all non-faulty areas downstream of the fault through remote closing. If a blocking signal from the first voltage-time type switch does not exist downstream of the fault's downstream boundary switch, the determined fault's downstream switch is remotely disconnected for the isolation operation downstream of the fault. The ring network switch is then closed to restore power to the non-faulty areas downstream of the fault.

[0080] Preferably, the step of isolating the downstream fault and restoring power supply to the non-faulty area based on the upstream fault boundary switch and the downstream fault boundary switch includes:

[0081] S74. When it is determined that the upstream boundary switch of the fault is a differential circuit breaker in the open state and the downstream boundary switch of the fault is a load switch in the open state, it is determined whether the downstream boundary switch of the fault issues a blocking signal according to the fault feeder model.

[0082] S75. If so, then control the ring network switch on the faulty feeder to close.

[0083] S76. If not, control the downstream boundary switch of the fault to close and then open in sequence, and then control the ring network switch on the fault feeder to close, so that the downstream boundary switch of the fault can be locked and the fault area can be isolated.

[0084] In a preferred embodiment of the present invention, if the downstream boundary switch of the fault issues a blocking signal, the isolation operation of the downstream of the fault is completed locally by the voltage-time type switch, and the master station remotely closes the ring network switch to restore power supply to the non-faulty area downstream of the fault; if the downstream boundary switch of the fault has not issued a blocking signal, it is determined that the downstream boundary switch of the fault has lost the blocking signal, and the downstream boundary switch of the fault needs to be remotely closed and then remotely opened. By controlling the opening and closing of the downstream boundary switch of the fault, the blocking of the voltage-time type switch downstream of the fault is realized, the fault isolation operation is completed, and finally the power supply to the non-faulty area is restored by closing the ring network switch.

[0085] Preferably, the step of isolating the downstream fault and restoring power supply to the non-faulty area based on the upstream fault boundary switch and the downstream fault boundary switch includes:

[0086] S77. When it is determined that the target voltage time-type switch is the upstream boundary switch of the fault, determine whether the downstream boundary switch of the fault is a differential circuit breaker.

[0087] S78. If so, control the downstream boundary switch of the fault to open and control the ring network switch on the fault feeder to close.

[0088] S79. If not, control the downstream boundary switch of the fault to close and then open in sequence, and then control the ring network switch on the fault feeder to close, so that the downstream boundary switch of the fault can be locked and the fault area can be isolated.

[0089] In a preferred embodiment of the present invention, based on the upstream boundary switch of the fault, the downstream boundary switch of the fault is searched through topological relationships. If the downstream boundary switch of the fault is a differential type switch, the switch is remotely disconnected to isolate the downstream of the fault, and then the ring network switch is remotely closed to restore power to the non-faulty area. If the downstream boundary switch of the fault is a voltage-time type switch, it is determined that the blocking signal is lost. By controlling the downstream boundary switch of the fault to close first and then open, the blocking of the downstream voltage-time type switch of the fault is realized, the fault isolation operation is completed, and finally the power supply to the non-faulty area is restored by closing the ring network switch.

[0090] As shown in Figure 5, the downstream boundary switch K3 is a voltage-time type switch. It is determined that K3 has lost its blocking signal. First, the downstream boundary switch is controlled to close and then open to realize the blocking of the downstream voltage-time type switch, thus completing the fault isolation operation. Finally, the power supply to the non-faulty area is restored by closing the ring network switch.

[0091] Preferably, the feeder fault self-healing method described in the above embodiments further includes:

[0092] S8. When it is determined that the end overcurrent switch is in the closed state and there is more than one blocking signal, it is determined that the fault area has been isolated by the voltage-time type switch located upstream and downstream of the fault, and the ring network switch on the fault feeder is controlled to close.

[0093] In a preferred embodiment of the present invention, if the number of blocking signals of the voltage-time switch is greater than 1, it can be determined that the voltage-time switch downstream of the fault is already in the open and blocked state according to the power grid topology and power supply relationship. The isolation operation of the upstream and downstream of the fault has been completed by the voltage-time equipment on site. The master station remotely closes the ring network switch to realize the restoration of power supply to the non-faulty area downstream of the fault.

[0094] Furthermore, the feeder fault self-healing method described in the above embodiments further includes:

[0095] S9. When it is determined that the end overcurrent switch is in the closed state and there is no blocking signal, it is determined that the faulty feeder cannot complete the fault isolation and power supply to the non-faulty area through the feeder self-healing operation, and the self-healing operation is blocked.

[0096] S10. When it is determined that there is a switch in the open state upstream of the target voltage time-type switch, it is determined that the fault feeder cannot complete the fault isolation and power supply to the non-faulty area through the feeder self-healing operation, and the self-healing operation is blocked.

[0097] In a preferred embodiment of the present invention, when it is determined that the end overcurrent switch is in the closed state and there is no blocking signal, it is judged that the switch may fail to operate and there is no blocking signal at the same time, the terminal may send a false signal, the model topology may be incorrect, or the blocking signal may be missed. In this case, for the sake of power supply safety, the self-healing is blocked.

[0098] If there is a switch in the open state upstream of the target voltage time-type switch that issued the blocking signal, this situation is quite complicated according to all the signals collected by the distribution master station. Switch failure to operate, terminal erroneous signals, incorrect configuration of switch self-healing information, unreasonable protection setting and master station model topology errors can all affect the judgment of the fault point. Therefore, for the safety of power supply, this self-healing is blocked in this case.

[0099] This embodiment provides a feeder fault self-healing method. It constructs a faulty feeder model based on the opening / closing signals, blocking signals, and location information of several switches mounted on the faulty feeder. Then, based on the faulty feeder model, it identifies the terminal overcurrent switch that has tripped and is located at the very end of the faulty feeder. Furthermore, based on the opening / closing status of the terminal overcurrent switch, it identifies the upstream and downstream boundary switches of the fault. This allows for precise location of the fault area based on the upstream and downstream boundary switches. Therefore, this invention no longer relies solely on the opening / closing and blocking status of voltage-time switches for fault location, but combines the topological relationship, opening / closing status, and blocking status of each switch on the faulty feeder to accurately locate the fault area and complete feeder self-healing. This effectively avoids the situation where voltage-time switches are mistakenly triggered due to undervoltage tripping and blocking, leading to an expansion of the fault location range, and effectively improves power supply reliability.

[0100] Referring to Figure 2, it is a structural schematic diagram of a feeder fault self-healing device provided in an embodiment of the present invention, comprising:

[0101] The signal acquisition module is used to acquire the opening and closing signals, blocking signals, and position information of several switches mounted on the fault feeder;

[0102] The model building module is used to construct a fault feeder model based on the opening and closing signals and the location information; wherein, the fault feeder model records the types, opening and closing states, and topological connections of several switches mounted on the fault feeder.

[0103] The switch determination module is used to determine, based on the fault feeder model, the end overcurrent switch that has tripped and is located at the end of the normal power supply line in the fault feeder, and to determine whether the end overcurrent switch is in the open state.

[0104] The first fault location module is used to determine, if yes, the end overcurrent switch as the upstream fault boundary switch and the switch located downstream and adjacent to the upstream fault boundary switch as the downstream fault boundary switch.

[0105] The second fault location module is used to locate the target voltage time-type switch corresponding to the blocking signal if, in the case that there is only one blocking signal, the target voltage time-type switch is identified as the upstream boundary switch of the fault, and the switch located downstream and adjacent to the upstream boundary switch of the fault is identified as the downstream boundary switch of the fault.

[0106] The fault self-healing module is used to determine the area between the upstream boundary switch and the downstream boundary switch of the fault as the fault interval, and then isolate the fault interval to restore power supply to the non-faulty area.

[0107] Furthermore, the step of isolating the downstream area of ​​the fault and restoring power supply to the non-faulty area based on the upstream fault boundary switch and the downstream fault boundary switch includes:

[0108] When it is determined that the upstream boundary switch of the fault is a differential circuit breaker in the open state and the downstream boundary switch of the fault is a differential circuit breaker in the closed state, the downstream boundary switch of the fault is controlled to open, and the ring network switch on the fault feeder is controlled to close.

[0109] Based on the fault feeder model, determine whether there is a first voltage-time type switch that issues a blocking signal in the power supply line downstream of the fault downstream boundary switch.

[0110] When the presence of the first voltage time-type switch is confirmed, the first voltage time-type switch is controlled to close.

[0111] It should be noted that the device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Furthermore, in the accompanying drawings of the device embodiments provided by this invention, the connection relationships between modules indicate that they have communication connections, which can be specifically implemented as one or more communication buses or signal lines. Those skilled in the art can understand and implement this without any creative effort.

[0112] Those skilled in the art will clearly understand that, for convenience and brevity, the specific working process of the device described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0113] Another preferred embodiment of the present invention provides a terminal device including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor executes the computer program to implement a feeder fault self-healing method as described in any of the foregoing embodiments.

[0114] The terminal device can be a desktop computer, laptop, handheld computer, or cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0115] The processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor. The processor is the control center of the terminal device, connecting all parts of the terminal device via various interfaces and lines.

[0116] The memory can be used to store the computer program. The processor implements various functions of the terminal device by running or executing the computer program stored in the memory and calling data stored in the memory. The memory may mainly include a program storage area and a data storage area. The program storage area may store the operating system, at least one application program required for a function, etc.; the data storage area may store data created based on the use of the mobile phone, etc. In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as hard disk, RAM, plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, at least one disk storage device, flash memory device, or other volatile solid-state storage device.

[0117] Another preferred embodiment of the present invention provides a storage medium, which is a computer-readable storage medium. A computer program is stored in the computer-readable storage medium, and when executed by a processor, the computer program can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable file, or some intermediate form. The computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc.

[0118] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A self-healing method for feeder faults, characterized in that, include: When confirming the completion of the upstream isolation operation of the faulty feeder, acquire the opening and closing signals, blocking signals, and position information of several switches installed on the faulty feeder; Based on the opening and closing signals and the location information, a fault feeder model is constructed; wherein, the fault feeder model records the types, opening and closing states, and topological connections of several switches mounted on the fault feeder; Based on the fault feeder model, the end overcurrent switch located at the upstream end of the fault is identified, and it is determined whether the end overcurrent switch is in the open state. If so, the terminal overcurrent switch is determined to be the upstream fault boundary switch, and the adjacent switch located downstream of the upstream fault boundary switch and participating in the upstream fault isolation operation is designated as the downstream fault boundary switch. If not, then if it is determined that there is only one blocking signal, find the target voltage time-type switch corresponding to the blocking signal; When it is determined, based on the fault feeder model, that there is no switch in the open state upstream of the target voltage time-type switch, the target voltage time-type switch is identified as the fault upstream boundary switch, and the switch located downstream of and adjacent to the fault upstream boundary switch is identified as the fault downstream boundary switch. The area between the upstream boundary switch and the downstream boundary switch is defined as the fault zone. Then, based on the upstream boundary switch and the downstream boundary switch, the downstream fault is isolated, and power supply to the non-faulty area is restored.

2. The feeder fault self-healing method as described in claim 1, characterized in that, The step of isolating the downstream area of ​​the fault and restoring power supply to the non-faulty area based on the upstream boundary switch and the downstream boundary switch includes: When it is determined that the upstream boundary switch of the fault is a differential circuit breaker in the open state and the downstream boundary switch of the fault is a differential circuit breaker in the closed state, the downstream boundary switch of the fault is controlled to open, and the ring network switch on the fault feeder is controlled to close. Based on the fault feeder model, determine whether there is a first voltage-time type switch that issues a blocking signal in the power supply line downstream of the fault downstream boundary switch. When the presence of the first voltage time-type switch is confirmed, the first voltage time-type switch is controlled to close.

3. The feeder fault self-healing method as described in claim 1, characterized in that, The step of isolating the downstream area of ​​the fault and restoring power supply to the non-faulty area based on the upstream boundary switch and the downstream boundary switch includes: When it is determined that the upstream boundary switch of the fault is a differential circuit breaker in the open state and the downstream boundary switch of the fault is a load switch in the open state, it is determined whether the downstream boundary switch of the fault issues a blocking signal according to the fault feeder model. If so, then control the ring network switch on the faulty feeder to close; If not, the downstream boundary switch of the fault is controlled to close and then open sequentially, and then the ring network switch on the fault feeder is controlled to close, so that the downstream boundary switch of the fault is locked and the fault area is isolated.

4. The feeder fault self-healing method as described in claim 1, characterized in that, The step of isolating the downstream area of ​​the fault and restoring power supply to the non-faulty area based on the upstream boundary switch and the downstream boundary switch includes: When the target voltage time-type switch is determined to be the upstream boundary switch of the fault, it is determined whether the downstream boundary switch of the fault is a differential circuit breaker. If so, control the downstream boundary switch of the fault to open and control the ring network switch on the fault feeder to close. If not, the downstream boundary switch of the fault is controlled to close and then open sequentially, and then the ring network switch on the fault feeder is controlled to close, so that the downstream boundary switch of the fault is locked and the fault area is isolated.

5. The feeder fault self-healing method as described in claim 1, characterized in that, Also includes: When it is determined that the end overcurrent switch is in the closed state and there is more than one blocking signal, it is determined that the fault area has been isolated by the voltage-time type switches located upstream and downstream of the fault, and the ring network switch on the fault feeder is controlled to close.

6. The feeder fault self-healing method as described in claim 1, characterized in that, Also includes: When it is determined that the end overcurrent switch is in the closed state and there is no blocking signal, it is determined that the faulty feeder cannot complete the fault isolation and power supply to the non-faulty area through the feeder self-healing operation, and the self-healing operation is blocked. When it is determined that there is a switch in the open state upstream of the target voltage time-type switch, it is determined that the faulty feeder cannot complete the fault isolation and power supply to the non-faulty area through the feeder self-healing operation, and the self-healing operation is blocked.

7. A feeder fault self-healing device, characterized in that, include: The signal acquisition module is used to acquire the opening and closing signals, blocking signals, and position information of several switches loaded on the faulty feeder when the upstream isolation operation of the faulty feeder is completed. The model building module is used to construct a fault feeder model based on the opening and closing signals and the location information; wherein, the fault feeder model records the types, opening and closing states, and topological connections of several switches mounted on the fault feeder. The switch determination module is used to determine the end overcurrent switch located at the far end of the upstream of the fault based on the fault feeder model, and to determine whether the end overcurrent switch is in the open state. The first fault location module is used to determine, if yes, the end overcurrent switch as the fault upstream boundary switch, and to designate the adjacent switch located downstream of the fault upstream boundary switch and participating in the fault upstream isolation operation as the fault downstream boundary switch. The second fault location module is used to locate the target voltage time-type switch corresponding to the blocking signal if, in the case that there is only one blocking signal, the target voltage time-type switch is identified as the upstream boundary switch of the fault, and the switch located downstream and adjacent to the upstream boundary switch of the fault is identified as the downstream boundary switch of the fault. The fault self-healing module is used to determine the area between the upstream fault boundary switch and the downstream fault boundary switch as the fault interval, and then isolate the downstream fault according to the upstream fault boundary switch and the downstream fault boundary switch, and restore power supply to the non-fault area.

8. A feeder fault self-healing device as described in claim 7, characterized in that, The step of isolating the downstream area of ​​the fault and restoring power supply to the non-faulty area based on the upstream boundary switch and the downstream boundary switch includes: When it is determined that the upstream boundary switch of the fault is a differential circuit breaker in the open state and the downstream boundary switch of the fault is a differential circuit breaker in the closed state, the downstream boundary switch of the fault is controlled to open, and the ring network switch on the fault feeder is controlled to close. Based on the fault feeder model, determine whether there is a first voltage-time type switch that issues a blocking signal in the power supply line downstream of the fault downstream boundary switch. When the presence of the first voltage time-type switch is confirmed, the first voltage time-type switch is controlled to close.

9. A terminal device, characterized in that, The system includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor, when executing the computer program, implements a feeder fault self-healing method as described in any one of claims 1 to 6.

10. A storage medium, characterized in that, The storage medium includes a stored computer program, wherein, when the computer program is executed, it controls the device containing the storage medium to perform a feeder fault self-healing method as described in any one of claims 1 to 6.

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