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

Abstract

The invention discloses a feeder line fault self-healing method and device, terminal equipment and a storage medium, and the method comprises the steps: building a fault feeder line model according to the switching-on and switching-off signals, blocking signals and position information of a plurality of switches loaded on a fault feeder line, and carrying out the self-healing of a feeder line fault according to the fault feeder line model; according to the method, the terminal overcurrent switch which is tripped and is located at the tail end of the fault feeder line is determined according to the fault area, and then the fault upstream boundary switch and the fault downstream boundary switch are determined according to the opening and closing state of the terminal overcurrent switch, so that the fault area is accurately positioned according to the fault upstream boundary switch and the fault downstream boundary switch. According to the method, fault positioning is not carried out only according to the opening and closing state and the locking state of the voltage time type switch any more, the topological relation, the opening and closing state and the locking state of all the switches on the fault feeder line are combined to carry out accurate positioning of the fault area, feeder line self-healing is completed, and the power supply reliability is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of smart distribution networks, and in particular to a feeder fault self-healing method, device, terminal equipment and storage medium. Background Art

[0002] "Voltage-time type" feeder automation is achieved through the working characteristics of the switch "no-voltage opening, power-on delay closing" and the secondary closing of the substation outgoing switch. The first closing isolates the fault section, and the second closing restores power supply to the non-fault section. When the feeder line is long, the number of switch openings and closings is large, and the power outage range is large, resulting in a long operation time and a greater impact on the load.

[0003] Therefore, for long lines, circuit breakers and load switches are generally used in a coordinated layout. Circuit breakers are used to divide the line into multiple sections. After a feeder fault occurs, the circuit breaker with differential protection on the feeder trips nearby to avoid power outages on the entire feeder. In conjunction with the voltage-time type load switch equipment, the upstream of the fault is quickly isolated. Specifically, when a short circuit fault occurs, the circuit breaker and load switch operate as follows: the differential circuit breaker quick-break protection of the line opens, and the load switch on the line opens due to loss of pressure. After the reclosing delay time, the circuit breaker recloses for the first time, and the switches along the line delay closing in the order of power on. If the fault is a transient fault, the line returns to normal operation; if the fault is a permanent fault, when the load switch is closed at the fault point, the differential circuit breaker quick-break protection opens, the load switch opens due to loss of pressure, and the switches before and after the fault point are automatically locked in the open state. After a period of time, the outgoing circuit breaker closes for the second time to restore power to the non-fault area upstream of the fault section.

[0004] However, the current hybrid layout of circuit breakers and voltage-time switches is based on the fault location method of the voltage-time switch X time limit lockout and Y time limit lockout signal, which easily leads to a fault location range larger than the actual fault area. The specific fault location logic is as follows: During the circuit breaker reclosing process, if a voltage-time switch encounters a fault after closing and causes a loss of voltage, and the switch fails to regain power and close within the set X time limit, the X time limit lockout is triggered. This means that the fault point is after the switch. If a voltage-time switch is already in a closed state before the fault, but loses voltage and automatically opens within a certain period of time (within the Y time limit) after the fault occurs, the Y time limit lockout is triggered. This usually indicates that the fault point is before or adjacent to the switch. The tripping of the circuit breaker will cause the voltage of the entire line or part of the line to drop, thereby triggering the voltage-loss opening and lockout logic of the voltage-time switch in the non-fault area, resulting in a fault location range larger than the actual fault area. In the subsequent fault isolation, the non-fault area is often mistakenly isolated, which seriously affects the power supply stability. Summary of the invention

[0005] The embodiments of the present invention provide a feeder fault self-healing method, apparatus, terminal equipment and storage medium, which determine the precise location of the fault area and complete the feeder self-healing by combining the topological relationship, opening and closing status, and locking status of each switch on the faulty feeder, thereby effectively improving the power supply reliability.

[0006] An embodiment of the present invention provides a feeder fault self-healing method, characterized by comprising:

[0007] When it is determined that the fault upstream isolation operation of the fault feeder is completed, obtaining the opening and closing signals, locking signals, and position information of a plurality of switches installed on the fault feeder;

[0008] A fault feeder model is constructed according to the opening and closing signals and the position information; wherein the fault feeder model records the types, opening and closing states, and topological connection relationships of several switches installed on the fault feeder;

[0009] According to the fault feeder model, determining the end overcurrent switch located at the end upstream of the fault, and judging whether the end overcurrent switch is in an open state;

[0010] If yes, the end overcurrent switch is determined to be the fault upstream boundary switch, and the adjacent switch located downstream of the fault upstream boundary switch and participating in the fault upstream isolation operation is used as the fault downstream boundary switch;

[0011] If not, in the case of determining that there is only one blocking signal, searching for a target voltage time type switch corresponding to the blocking signal;

[0012] When it is determined according to 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 determined as the fault upstream boundary switch, and the switch located downstream and adjacent to the fault upstream boundary switch is determined as the fault downstream boundary switch;

[0013] The area between the faulty upstream boundary switch and the faulty downstream boundary switch is determined as the faulty interval, and then the faulty downstream is isolated according to the faulty upstream boundary switch and the faulty downstream boundary switch, and power supply to the non-faulty area is restored.

[0014] Further, isolating the faulty downstream area according to the faulty upstream boundary switch and the faulty downstream boundary switch and restoring power supply to the non-faulty area includes:

[0015] When it is determined that the fault upstream boundary switch is a differential circuit breaker in an open state, and the fault downstream boundary switch is a differential circuit breaker in a closed state, controlling the fault downstream boundary switch to be open, and controlling the ring network switch on the fault feeder to be closed;

[0016] According to the fault feeder model, determining whether there is a first voltage-time type switch that sends a blocking signal in the power supply line downstream of the fault downstream boundary switch;

[0017] When it is determined that the first voltage-time type switch exists, the first voltage-time type switch is controlled to be closed.

[0018] Further, isolating the faulty downstream area according to the faulty upstream boundary switch and the faulty downstream boundary switch and restoring power supply to the non-faulty area includes:

[0019] When it is determined that the fault upstream boundary switch is a differential circuit breaker in an open state, and the fault downstream boundary switch is a load switch in an open state, judging whether the fault downstream boundary switch sends a locking signal according to the fault feeder model;

[0020] If yes, controlling the ring network switch on the faulty feeder to close;

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

[0022] Further, isolating the faulty downstream area according to the faulty upstream boundary switch and the faulty downstream boundary switch and restoring power supply to the non-faulty area includes:

[0023] When it is determined that the target voltage time type switch is a fault upstream boundary switch, determining whether the fault downstream boundary switch is a differential circuit breaker;

[0024] If yes, 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 fault downstream boundary switch is controlled to close and then open in sequence, and then the ring network switch on the fault feeder is controlled to close, so that the fault downstream boundary switch is locked and the fault area is isolated.

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

[0027] When it is determined that the end overcurrent switch is in the closed state and there is more than one locking 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 as described in the above embodiment further includes:

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

[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 fault feeder cannot complete fault isolation and power supply to the non-fault area through the feeder self-healing operation, and the self-healing operation is locked.

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

[0032] A signal acquisition module, used to acquire opening and closing signals, locking signals, and position information of a plurality of switches installed on the fault feeder when it is determined that the fault upstream isolation operation of the fault feeder is completed;

[0033] A model building module, used to build a fault feeder model according to the opening and closing signals and the position information; wherein the fault feeder model records the types, opening and closing states, and topological connection relationships of several switches installed on the fault feeder;

[0034] A switch determination module, used to determine the end overcurrent switch located at the end upstream of the fault according to the fault feeder model, and determine whether the end overcurrent switch is in an open state;

[0035] A first fault location module, configured to determine that, if yes, the end overcurrent switch is a fault upstream boundary switch, and use an adjacent switch located downstream of the fault upstream boundary switch and participating in the fault upstream isolation operation as a fault downstream boundary switch;

[0036] The second fault location module is used for, if no, in the case of determining that there is only one blocking signal, searching for the target voltage time type switch corresponding to the blocking signal; when it is determined according to the fault feeder model that there is no switch in the open state upstream of the target voltage time type switch, determining the target voltage time type switch as the fault upstream boundary switch, and determining the switch located downstream and adjacent to the fault upstream boundary switch as the fault downstream boundary switch;

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

[0038] Further, isolating the faulty downstream area according to the faulty upstream boundary switch and the faulty downstream boundary switch and restoring power supply to the non-faulty area includes:

[0039] When it is determined that the fault upstream boundary switch is a differential circuit breaker in an open state, and the fault downstream boundary switch is a differential circuit breaker in a closed state, controlling the fault downstream boundary switch to be open, and controlling the ring network switch on the fault feeder to be closed;

[0040] According to the fault feeder model, determining whether there is a first voltage-time type switch that sends a blocking signal in the power supply line downstream of the fault downstream boundary switch;

[0041] When it is determined that the first voltage-time type switch exists, the first voltage-time type switch is controlled to be closed.

[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 when the processor executes the computer program, a feeder fault self-healing method as described in any one of the embodiments is implemented.

[0043] Another embodiment of the present invention provides a storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the storage medium is located is controlled to execute a feeder fault self-healing method as described in any one of the above embodiments.

[0044] The following beneficial effects are achieved by implementing the present invention:

[0045] The present invention discloses a feeder fault self-healing method, device, terminal equipment and storage medium. The method constructs a fault feeder model according to the opening and closing signals, locking signals and position information of several switches loaded on the fault feeder, and then determines the end overcurrent switch that has tripped and is located at the end of the fault feeder according to the fault feeder model, and then determines the fault upstream boundary switch and the fault downstream boundary switch according to the opening and closing status of the end overcurrent switch, so that the fault area can be accurately located according to the fault upstream boundary switch and the fault downstream boundary switch. Therefore, the present invention no longer locates the fault only according to the opening and closing status and the locking status of the voltage-time type switch, but combines the topological relationship, opening and closing status and the locking status of each switch on the fault feeder to accurately locate the fault area and complete the feeder self-healing, effectively avoiding the situation that the voltage-time type switch's under-voltage opening and locking are erroneously triggered, thereby causing the fault location range to expand, and effectively improving the power supply reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a flow chart of a feeder fault self-healing method provided by one embodiment of the present invention.

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

[0048] Figure 3 It is a structural diagram of a feeder provided by an embodiment of the present invention when it is operating normally.

[0049] Figure 4 It is a flow chart of the actions of each switch when a feeder failure occurs, provided by an embodiment of the present invention.

[0050] Figure 5 This is another action flow chart of each switch when a feeder failure occurs, provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work 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 technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0053] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0054] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0055] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0056] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0057] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0058] See also Figure 1 , is a flow chart of a feeder fault self-healing method provided by an embodiment of the present invention, comprising:

[0059] S1. When it is determined that the fault upstream isolation operation of the fault feeder is completed, obtaining the opening and closing signals, locking signals, and position information of several switches installed on the fault feeder;

[0060] In a preferred embodiment of the present invention, initially, the switches are automatically divided into two types: differential circuit breakers and load switches according to the types of several switches carried by the distribution network. It should be noted that the voltage time type switch is a type of load switch, and then the binding of protection information, locking signal and switch equipment is completed. When it is determined that the fault upstream isolation operation of the fault feeder is completed, the switch opening and closing signal, locking signal and switch position information during the fault period are obtained.

[0061] like Figure 3 As shown in Figure 1, the fault feeder model corresponds to the fault feeder model when the feeder is not faulty. Figure 4 As shown in the figure, ad respectively represents the process of the feeder autonomously completing the fault upstream isolation when a fault occurs between switches K2 and K3. Specifically, when a fault occurs between switches K2 and K3, K1 trips, K2 and K3 open due to loss of voltage, K1 recloses, and K2 closes after being energized, causing the faulty K1 to trip again, K2 open and lock due to loss of power, and K1 closes to restore the upstream power supply of the fault.

[0062] S2. constructing a fault feeder model according to the opening and closing signals and the position information; wherein the fault feeder model records the types, opening and closing states, and topological connection relationships of several switches installed on the fault feeder;

[0063] In a preferred embodiment of the present invention, according to the connection relationship between these switches and the opening and closing signals of the switches during the fault, non-disconnecting devices such as feeder segments and fault fingers, as well as disconnecting devices such as switches, switches, fuses, etc. that do not affect the self-healing topology are eliminated, and the following is established: Figure 3 as well as Figure 4 The fault feeder model shown starts from the outgoing switch power supply side of the substation and extends to each backup power supply side and each branch line. It can be understood that by identifying and filtering non-essential 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 the upstream mentioned in the following text is the direction from the switch to one end of the power supply side, and the downstream is the direction extending from the power supply side to the end.

[0065] S3. According to the fault feeder model, determine the end overcurrent switch located at the end upstream of the fault, and judge whether the end overcurrent switch is in an open state;

[0066] In a preferred embodiment of the present invention, Figure 4As shown, after the fault feeder restores upstream power supply, the terminal overcurrent switch located at the end 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 overcurrent switch of the feeder based on the adjacency matrix. According to the fault protection signal and opening and closing information of the received differential switch and voltage time type switch, based on the energized topology and power supply relationship of the feeder, according to the depth-first and breadth-first algorithms, the branches of the search tree are traversed and searched as deeply as possible. When the edges where the node is located have been explored, the search will trace back to the starting node of the edge where the node is found, and finally analyze and determine the end overcurrent switch.

[0068] S4, if yes, determine that the end overcurrent switch is the fault upstream boundary switch, and use 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;

[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 the end overcurrent switch can be determined to be the upstream boundary of the fault. Then, based on the equipment topology relationship 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 isolation operation of the fault, and this switch is used as the downstream switch of the fault.

[0070] S5. If not, when it is determined that there is only one blocking signal, search for a target voltage time type switch corresponding to the blocking signal;

[0071] S6. When it is determined according to 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 determined as the fault upstream boundary switch, and the switch located downstream and adjacent to the fault upstream boundary switch is determined as the fault downstream boundary switch;

[0072] In a preferred embodiment of the present invention, Figure 4 As shown, 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 loses power and opens and locks. Therefore, at this time, there is only a locking signal sent by K2, and there is no switch in the open state upstream of K2. Therefore, K2 is determined to be the upstream boundary switch of the fault, and the search continues downward from the upstream device to traverse and find the downstream boundary switch K3 of the fault.

[0073] S7: Determine the area between the faulty upstream boundary switch and the faulty downstream boundary switch as the faulty interval, and then isolate the faulty downstream according to the faulty upstream boundary switch and the faulty downstream boundary switch, and restore power supply to the non-faulty area.

[0074] Preferably, isolating the fault downstream according to the fault upstream boundary switch and the fault downstream boundary switch and restoring power supply to the non-fault area includes:

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

[0076] S72, judging, according to the fault feeder model, whether there is a first voltage-time type switch that sends 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, according to the determined fault downstream boundary switch, the current position state 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 according to all terminal signals on the fault feeder obtained, it is analyzed whether there is a locking signal of the first voltage time type switch on the downstream power supply line of the fault downstream boundary switch;

[0079] If there is a locking signal of the first voltage-time type switch downstream of the fault downstream boundary switch, the fault downstream boundary switch determined by remote control is disconnected to complete the isolation operation downstream of the fault, the ring network switch is closed, and the first voltage-time type switch that generates the locking signal is closed by remote control. Because the switch is already locked, closing the ring network switch cannot cause the first voltage-time type switch to be energized and closed. By means of remote control closing, all non-fault areas downstream of the fault are restored to power. If there is no locking signal of the first voltage-time type switch downstream of the fault downstream boundary switch, the fault downstream switch determined by analysis is remotely disconnected for the isolation operation downstream of the fault, and the ring network switch is closed to restore power to the non-fault areas downstream of the fault.

[0080] Preferably, isolating the fault downstream according to the fault upstream boundary switch and the fault downstream boundary switch and restoring power supply to the non-fault area includes:

[0081] S74, when it is determined that the fault upstream boundary switch is a differential circuit breaker in an open state, and the fault downstream boundary switch is a load switch in an open state, judging whether the fault downstream boundary switch sends a locking signal according to the fault feeder model;

[0082] S75: If yes, control the ring network switch on the faulty feeder to close;

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

[0084] In a preferred embodiment of the present invention, if the fault downstream boundary switch sends a locking signal, the isolation operation downstream of the fault is completed on-site by the voltage-time type switch, and the master station remotely closes the ring network switch, thereby completing the restoration of power supply to the non-fault area downstream of the fault; if the fault downstream boundary switch has never sent a locking signal, it is determined that the fault downstream boundary switch has lost the locking signal, and it is necessary to remotely close the fault downstream boundary switch, and then remotely disconnect the fault downstream boundary switch. By controlling the fault downstream boundary switch to close and then open, the locking of the fault downstream voltage-time type switch is achieved, the fault isolation operation is completed, and finally the power supply to the non-fault area is restored by closing the ring network switch.

[0085] Preferably, isolating the fault downstream according to the fault upstream boundary switch and the fault downstream boundary switch and restoring power supply to the non-fault area includes:

[0086] S77, when it is determined that the target voltage time type switch is a fault upstream boundary switch, determining whether the fault downstream boundary switch is a differential circuit breaker;

[0087] S78: If yes, 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 fault downstream boundary switch to close and then open in sequence, and then control the ring network switch on the fault feeder to close, so that the fault downstream boundary switch is locked and the fault area is isolated.

[0089] In a preferred embodiment of the present invention, according to the faulty upstream boundary switch, the faulty downstream boundary switch is searched through the topological relationship traversal. If the faulty downstream boundary switch is a differential type switch, the switch is remotely disconnected to isolate the faulty downstream, and then the ring network switch is remotely closed to restore power to the non-faulty area. If the faulty downstream boundary switch is a voltage-time type switch, it is determined that the locking signal is lost, and the faulty downstream voltage-time type switch is locked by first controlling the faulty downstream boundary switch to close and then to open, thereby completing the fault isolation operation, and finally restoring power to the non-faulty area by closing the ring network switch.

[0090] like Figure 5As shown, if the fault downstream boundary switch K3 is a voltage-time type switch, it is determined that K3 has lost the locking signal, and the fault downstream boundary switch is first controlled to be closed and then to be opened to achieve the locking of the fault downstream voltage-time type switch, complete the fault isolation operation, and finally restore power supply to the non-fault area by closing the ring network switch.

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

[0092] S8. When it is determined that the terminal overcurrent switch is in a closed state and there is more than one locking 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.

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

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

[0095] S9, when it is determined that the end overcurrent switch is in a closed state and there is no locking signal, it is determined that the fault feeder cannot complete fault isolation and power supply to the non-fault area through the feeder self-healing operation, and the self-healing operation is locked;

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

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

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

[0099] The present embodiment provides a feeder fault self-healing method, by constructing a fault feeder model according to the opening and closing signals, locking signals, and position information of several switches loaded on the fault feeder, and then determining the end overcurrent switch that has tripped and is located at the end of the fault feeder according to the fault feeder model, and then determining the upstream boundary switch and the downstream boundary switch of the fault according to the opening and closing status of the end overcurrent switch, so that the fault area can be accurately located according to the upstream boundary switch and the downstream boundary switch of the fault. Therefore, the present invention no longer locates the fault only according to the opening and closing status and the locking status of the voltage-time type switch, but combines the topological relationship, opening and closing status, and locking status of each switch on the fault feeder to accurately locate the fault area and complete the feeder self-healing, effectively avoiding the voltage-time type switch The voltage-time type switch is opened and locked. The false triggering of the loss of pressure and the expansion of the fault location range is effectively avoided, and the power supply reliability is effectively improved.

[0100] See also Figure 2 , is a schematic diagram of the structure of a feeder fault self-healing device provided by an embodiment of the present invention, comprising:

[0101] A signal acquisition module, used to acquire the opening and closing signals, locking signals, and position information of several switches installed on the fault feeder;

[0102] A model building module, used to build a fault feeder model according to the opening and closing signals and the position information; wherein the fault feeder model records the types, opening and closing states, and topological connection relationships of several switches installed on the fault feeder;

[0103] A switch determination module is used to determine, according to the fault feeder model, an end overcurrent switch that has tripped and is located at the end of a normal power supply line in the fault feeder, and to determine whether the end overcurrent switch is in an open state;

[0104] A first fault locating module, configured to, if yes, determine that the end overcurrent switch is a fault upstream boundary switch, and use a switch located downstream and adjacent to the fault upstream boundary switch as a fault downstream boundary switch;

[0105] The second fault location module is used for, if no, in the case of determining that there is only one blocking signal, searching for the target voltage time type switch corresponding to the blocking signal; when it is determined according to the fault feeder model that there is no switch in the open state upstream of the target voltage time type switch, determining the target voltage time type switch as the fault upstream boundary switch, and determining the switch located downstream and adjacent to the fault upstream boundary switch as the fault downstream boundary switch;

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

[0107] Further, isolating the faulty downstream area according to the faulty upstream boundary switch and the faulty downstream boundary switch and restoring power supply to the non-faulty area includes:

[0108] When it is determined that the fault upstream boundary switch is a differential circuit breaker in an open state, and the fault downstream boundary switch is a differential circuit breaker in a closed state, controlling the fault downstream boundary switch to be open, and controlling the ring network switch on the fault feeder to be closed;

[0109] According to the fault feeder model, determining whether there is a first voltage-time type switch that sends a blocking signal in the power supply line downstream of the fault downstream boundary switch;

[0110] When it is determined that the first voltage-time type switch exists, the first voltage-time type switch is controlled to be closed.

[0111] It should be noted that the device embodiments described above are merely 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 scheme of this embodiment. In addition, in the accompanying drawings of the device embodiments provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, which may be specifically implemented as one or more communication buses or signal lines. A person of ordinary skill in the art may understand and implement it without paying any creative effort.

[0112] Those skilled in the art can clearly understand that for the sake of convenience and brevity, the specific working process of the device described above can refer to the corresponding process in the aforementioned method embodiment, 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 when the processor executes the computer program, a feeder fault self-healing method as described in any one of the above embodiments is implemented.

[0114] The terminal device may be a computing device such as a desktop computer, a notebook, a PDA, a cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0115] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor, etc. The processor is the control center of the terminal device, and uses various interfaces and lines to connect various parts of the entire terminal device.

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

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

[0118] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A feeder fault self-healing method, characterized in that: include: When it is determined that the fault upstream isolation operation of the fault feeder is completed, obtaining the opening and closing signals, locking signals, and position information of a plurality of switches installed on the fault feeder; A fault feeder model is constructed according to the opening and closing signals and the position information; wherein the fault feeder model records the types, opening and closing states, and topological connection relationships of several switches installed on the fault feeder; According to the fault feeder model, determining the end overcurrent switch located at the end upstream of the fault, and judging whether the end overcurrent switch is in an open state; If yes, the end overcurrent switch is determined to be the fault upstream boundary switch, and the adjacent switch located downstream of the fault upstream boundary switch and participating in the fault upstream isolation operation is used as the fault downstream boundary switch; If not, then in the case of determining that there is only one blocking signal, searching for the target voltage time type switch corresponding to the blocking signal; When it is determined according to 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 determined as the fault upstream boundary switch, and the switch located downstream and adjacent to the fault upstream boundary switch is determined as the fault downstream boundary switch; The area between the faulty upstream boundary switch and the faulty downstream boundary switch is determined as the faulty interval, and then the faulty downstream is isolated according to the faulty upstream boundary switch and the faulty downstream boundary switch, and power supply to the non-faulty area is restored.

2. A feeder fault self-healing method according to claim 1, characterized in that: The method of isolating the fault downstream according to the fault upstream boundary switch and the fault downstream boundary switch and restoring power supply to the non-fault area includes: When it is determined that the fault upstream boundary switch is a differential circuit breaker in an open state, and the fault downstream boundary switch is a differential circuit breaker in a closed state, controlling the fault downstream boundary switch to be open, and controlling the ring network switch on the fault feeder to be closed; According to the fault feeder model, determining whether there is a first voltage-time type switch that sends a blocking signal in the power supply line downstream of the fault downstream boundary switch; When it is determined that the first voltage-time type switch exists, the first voltage-time type switch is controlled to be closed.

3. A feeder fault self-healing method as claimed in claim 1, characterized in that: The method of isolating the fault downstream according to the fault upstream boundary switch and the fault downstream boundary switch and restoring power supply to the non-fault area includes: When it is determined that the fault upstream boundary switch is a differential circuit breaker in an open state, and the fault downstream boundary switch is a load switch in an open state, judging whether the fault downstream boundary switch sends a locking signal according to the fault feeder model; If yes, controlling the ring network switch on the faulty feeder to close; If not, the fault downstream boundary switch is controlled to be closed and then opened in sequence, and then the ring network switch on the fault feeder is controlled to be closed, so that the fault downstream boundary switch is locked and the fault area is isolated.

4. A feeder fault self-healing method according to claim 1, characterized in that: The method of isolating the fault downstream according to the fault upstream boundary switch and the fault downstream boundary switch and restoring power supply to the non-fault area includes: When it is determined that the target voltage time type switch is a fault upstream boundary switch, determining whether the fault downstream boundary switch is a differential circuit breaker; If yes, 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 fault downstream boundary switch is controlled to be closed and then opened in sequence, and then the ring network switch on the fault feeder is controlled to be closed, so that the fault downstream boundary switch is locked and the fault area is isolated.

5. A feeder fault self-healing method according to 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 locking 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. A feeder fault self-healing method according to claim 1, characterized in that: Also includes: When it is determined that the end overcurrent switch is in a closed state and there is no locking signal, it is determined that the fault feeder cannot complete fault isolation and power supply to the non-fault area through the feeder self-healing operation, and the self-healing operation is locked; 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 fault isolation and power supply to the non-fault area through the feeder self-healing operation, and the self-healing operation is locked.

7. A feeder fault self-healing device, characterized in that: include: A signal acquisition module, used to acquire opening and closing signals, locking signals, and position information of a plurality of switches installed on the fault feeder when it is determined that the fault upstream isolation operation of the fault feeder is completed; A model building module, used to build a fault feeder model according to the opening and closing signals and the position information; wherein the fault feeder model records the types, opening and closing states, and topological connection relationships of several switches installed on the fault feeder; A switch determination module, used to determine the end overcurrent switch located at the end upstream of the fault according to the fault feeder model, and determine whether the end overcurrent switch is in an open state; A first fault location module, configured to determine that, if yes, the end overcurrent switch is a fault upstream boundary switch, and use an adjacent switch located downstream of the fault upstream boundary switch and participating in the fault upstream isolation operation as a fault downstream boundary switch; The second fault location module is used for, if no, in the case of determining that there is only one blocking signal, searching for the target voltage time type switch corresponding to the blocking signal; when it is determined according to the fault feeder model that there is no switch in the open state upstream of the target voltage time type switch, determining the target voltage time type switch as the fault upstream boundary switch, and determining the switch located downstream and adjacent to the fault upstream boundary switch as the fault downstream boundary switch; The fault self-healing module is used to determine the area between the faulty upstream boundary switch and the faulty downstream boundary switch as the faulty interval, and then isolate the faulty downstream according to the faulty upstream boundary switch and the faulty downstream boundary switch, and restore power supply to the non-faulty area.

8. A feeder fault self-healing device as claimed in claim 7, characterized in that: The method of isolating the fault downstream according to the fault upstream boundary switch and the fault downstream boundary switch and restoring power supply to the non-fault area includes: When it is determined that the fault upstream boundary switch is a differential circuit breaker in an open state, and the fault downstream boundary switch is a differential circuit breaker in a closed state, controlling the fault downstream boundary switch to be open, and controlling the ring network switch on the fault feeder to be closed; According to the fault feeder model, determining whether there is a first voltage-time type switch that sends a blocking signal in the power supply line downstream of the fault downstream boundary switch; When it is determined that the first voltage-time type switch exists, the first voltage-time type switch is controlled to be closed.

9. A terminal device, characterized in that: The method comprises a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, a feeder fault self-healing method as claimed in any one of claims 1 to 6 is implemented.

10. A storage medium, characterized in that: The storage medium includes a stored computer program, wherein when the computer program is executed, the device where the storage medium is located is controlled to execute a feeder fault self-healing method according to any one of claims 1 to 6.

Images