A feeder fault self-healing method and device, a terminal device and a storage medium

Abstract

The application discloses a kind of feeder fault self-healing method, device, terminal equipment and storage medium, by according to the opening and closing signal of several switches loaded on fault feeder, locking signal, and position information, construct fault feeder model, then according to fault feeder model, determine the end over-current switch that occurs trip and is located in the last end of fault feeder, again according to the opening and closing state of end over-current switch, determine the upstream boundary switch of fault and downstream boundary switch of fault, to make accurate positioning fault area according to upstream boundary switch of fault and downstream boundary switch of fault, therefore, the application no longer only according to the opening and closing state and locking state of voltage time type switch carries out fault positioning, but is combined with the topological relationship of each switch on fault feeder, opening and closing state, and locking state, to carry out accurate positioning of fault area, and complete feeder self-healing, effectively improve power supply reliability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of intelligent power distribution network, and particularly relates to a feeder fault self-healing method and device, a terminal device and a storage medium. BACKGROUND

[0002] The "voltage-time type" feeder automation is realized by the working characteristics of the switch "no-voltage opening and power-on delay closing" cooperating with the secondary closing of the substation outgoing switch. The primary closing isolates the fault interval, and the secondary closing restores the power supply of the non-fault section. When the feeder line is long, the switch opening and closing times are many, and the power outage range is large, resulting in long action time and large impact on the load.

[0003] Therefore, for long lines, circuit breakers and load switches are generally used in cooperation. The circuit breakers are used to divide the line into multiple sections, and the circuit breakers with step-difference protection are tripped near the fault point of the feeder after the fault occurs, thereby avoiding the outage of the entire feeder. In cooperation with the voltage-time type load switch device, the isolation of the upstream fault is quickly completed. Specifically, when a short-circuit fault occurs, the action of the circuit breaker and the load switch is as follows: the step-difference circuit breaker of the line acts to open, and the load switch on the line opens due to loss of voltage. After the reclosing delay time, the circuit breaker is reclosed for the first time, and the switches along the line are sequentially reclosed in the order of power-on. If the fault is transient, the line returns to the normal operating state. If the fault is permanent, when the load switch is closed at the fault point, the step-difference circuit breaker acts to open, the load switch loses voltage and opens, 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 is reclosed for the second time to restore power supply to the non-fault area upstream of the fault section.

[0004] However, the current mixed layout of circuit breakers and voltage-time type switches easily leads to a fault positioning range greater than the actual fault area according to the voltage-time type switch X-time limit locking and Y-time limit locking signals. Specifically, the fault positioning logic is as follows: during the reclosing process of the circuit breaker, if a voltage-time type switch loses voltage after being reclosed due to a fault and fails to regain power and be reclosed within the set X-time limit, the X-time limit locking is triggered. This means that the fault point is behind the switch. If a voltage-time type switch is already in the closed state before the fault occurs, but loses voltage and automatically opens within a certain time (Y-time limit) after the fault occurs, the Y-time limit locking is triggered. This usually indicates that the fault point is before or adjacent to the switch. The tripping of the circuit breaker causes the voltage of the entire line or part of the line to drop, thereby triggering the loss-of-voltage opening and locking logic of the voltage-time type switches in the non-fault area, resulting in a fault positioning range greater than the actual fault area. Therefore, during subsequent fault isolation, the non-fault area is often incorrectly isolated, which seriously affects the stability of power supply. SUMMARY

[0005] Embodiments of the present invention provide a feeder fault self-healing method, apparatus, terminal device, and storage medium. By combining the topological relationship, opening and closing status, and locking status of each switch on the faulty feeder, the fault area can be accurately located and the feeder self-healing can be completed, 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 several switches installed on the fault feeder;

[0008] Constructing 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 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 so, the terminal 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, when it is determined 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 section, and then the faulty downstream is isolated based on the faulty upstream boundary switch and the faulty downstream boundary switch, and power supply to the non-faulty area is restored.

[0014] Furthermore, isolating the fault downstream and restoring power supply to non-fault areas based on the faulty upstream boundary switch and the faulty downstream boundary switch 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 on 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] Furthermore, isolating the fault downstream and restoring power supply to non-fault areas based on the faulty upstream boundary switch and the faulty downstream boundary switch 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 fault feeder to close;

[0021] If not, the fault downstream boundary switch is controlled to be closed and 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.

[0022] Furthermore, isolating the fault downstream and restoring power supply to non-fault areas based on the faulty upstream boundary switch and the faulty downstream boundary switch 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 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 fault downstream boundary switch is controlled to be closed and 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.

[0026] Furthermore, the feeder fault self-healing method according to the above embodiment further includes:

[0027] determining that the fault area has been isolated by the voltage time type switches located upstream and downstream of the fault, and controlling the ring network switches on the fault feeder to close.

[0028] Further, the feeder fault self-healing method as described in the above embodiment further comprises:

[0029] determining that the fault feeder cannot complete fault isolation and power supply of the non-fault area through the feeder self-healing operation, and locking the current self-healing operation, when it is determined that the end over-current switch is in the closed state and there is no blocking signal.

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

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

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

[0033] a model construction module, configured to construct 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 the plurality of switches loaded on the fault feeder;

[0034] a switch determination module, configured to determine an end over-current switch located at the last end upstream of the fault according to the fault feeder model, and determine whether the end over-current switch is in the open state;

[0035] a first fault positioning module, configured to determine that the end over-current switch is a fault upstream boundary switch if yes, and determine a switch adjacent to the fault upstream boundary switch and located downstream of the fault upstream boundary switch as a fault downstream boundary switch;

[0036] a second fault positioning module, configured to determine a target voltage time type switch corresponding to the blocking signal if no, and determine the target voltage time type switch as the fault upstream boundary switch and a switch adjacent to the fault upstream boundary switch and located downstream of the fault upstream boundary switch according to the fault feeder model, when it is determined that there is no switch in the open state upstream of the target voltage time type 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] Furthermore, isolating the fault downstream and restoring power supply to non-fault areas based on the faulty upstream boundary switch and the faulty downstream boundary switch 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 on 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. When the computer program is executed, 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 application discloses a kind of feeder fault self-healing method, device, terminal equipment and storage medium, the method is constructed fault feeder model according to the opening and closing signal, locking signal and position information of several switches loaded on fault feeder, then according to fault feeder model, determine the end over-current switch that occurs trip and is located in the last end of fault feeder, and according to the opening and closing state of end over-current switch, determine the upstream boundary switch of fault and the downstream boundary switch of fault, to accurately locate fault area according to the upstream boundary switch of fault and the downstream boundary switch of fault, therefore, the application no longer only according to the opening and closing state and locking state of voltage time type switch carries out fault positioning, but the topology relationship, opening and closing state and locking state of each switch on fault feeder are combined to accurately locate fault area, and complete feeder self-healing, effectively avoid the case that the voltage time type switch is lost voltage and is mis-triggered to cause the expansion of fault positioning range, effectively improve power supply reliability. BRIEF DESCRIPTION OF DRAWINGS

[0046] Figure 1 It is a kind of feeder fault self-healing method flow chart provided by an embodiment of the application.

[0047] Figure 2 It is the structure schematic diagram of a kind of feeder fault self-healing device provided by an embodiment of the application.

[0048] Figure 3 It is the structure schematic diagram of feeder normal operation provided by an embodiment of the application.

[0049] Figure 4 It is the action flow chart of each switch when feeder fault occurs provided by an embodiment of the application.

[0050] Figure 5 It is another action flow chart of each switch when feeder fault occurs provided by an embodiment of the application. DETAILED DESCRIPTION

[0051] To make the purpose, technical scheme and advantages of the present application more clear, the technical scheme in the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application, obviously, the described embodiments are part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art 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" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0053] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0054] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, 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 this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects 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 expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

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

[0059] S1. When it is determined that the upstream isolation operation of the fault feeder is completed, obtaining 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, the distribution network automatically categorizes the switches into two types: differential circuit breakers and load switches. Note that voltage-time switches are a type of load switch. Protection information and blocking signals are then bound to the switchgear. Upon determining that upstream isolation of the faulty feeder has been completed, the switch's opening and closing signals, blocking signals, and position information during the fault period are obtained.

[0061] like Figure 3 As shown in , the corresponding fault feeder model when the feeder is not faulty. Figure 4 As shown in the figure, steps ad are 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 voltage loss, K1 recloses, and K2 closes after receiving power. This causes K1 to trip again, K2 to open and lock due to power loss, and K1 closes to restore power supply to the upstream of the fault.

[0062] S2. Constructing 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 connection relationships of several switches installed on the fault feeder;

[0063] In a preferred embodiment of the present invention, based on the connection relationship between these switches and the opening and closing signals of the switches during the fault period, 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 at the substation's outgoing switch power supply and extends to each backup power supply and branch line. It can be understood that by identifying and filtering non-essential device parameters and reducing the device memory model size, the efficiency of fault analysis and handling 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. Determine, based on the fault feeder model, the end overcurrent switch located at the end upstream of the fault, and determine 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 end 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 feeder's terminal overcurrent switch based on the adjacency matrix. Based on the received fault protection signals and trip / close information from the differential and voltage-time switches, and based on the energized feeder topology and power supply relationships, the search tree branches are traversed and searched as deeply as possible using depth-first and breadth-first algorithms. 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 analyzes and determines the terminal overcurrent switch.

[0068] S4. If yes, determine that the terminal 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 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 fault downstream switch.

[0070] S5. If not, when it is determined that there is only one blocking signal, search for a target voltage-time 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 profile switch, the target voltage-time profile 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 lock 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. The search continues downward from the upstream device and traverses to 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 section, then isolate the faulty downstream area based on 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 and restoring power supply to non-fault areas based on the fault upstream boundary switch and the fault downstream boundary switch 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. Determine, based on the fault feeder model, whether there is a first voltage-time type switch that sends a blocking signal on 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 be closed.

[0078] In a preferred embodiment of the present invention, based on the determined faulty downstream boundary switch and obtaining the current position state and switch type of the faulty downstream boundary switch, if the faulty downstream boundary switch is in the closed state and is a circuit breaker, then based on all obtained terminal signals on the faulty 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 faulty downstream boundary switch;

[0079] If a blocking signal from the first voltage-time type switch is present downstream of the faulty downstream boundary switch, the identified faulty downstream boundary switch is remotely 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 blocking signal is remotely closed. Because this switch is already locked, closing the ring network switch will not cause the first voltage-time type switch to be energized and closed. By remotely closing the switch, power is restored to all non-fault areas downstream of the fault. If a blocking signal from the first voltage-time type switch is not present downstream of the faulty downstream boundary switch, the identified faulty downstream switch 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 and restoring power supply to non-fault areas based on the fault upstream boundary switch and the fault downstream boundary switch 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, determine, based on the fault feeder model, whether the fault downstream boundary switch sends a locking signal;

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

[0083] S76, if not, then controlling the fault downstream boundary switch to be closed and then opened in turn, and then controlling the looped network switch on the fault feeder to be closed, so that the fault downstream boundary switch completes the locking and the fault area isolation is completed.

[0084] In a preferred embodiment of the present application, if the fault downstream boundary switch sends a locking signal, the isolation operation downstream of the fault is completed by the voltage time type switch in situ, and the main station remotely controls the looped network switch to be closed, so that the power supply of the non-fault area downstream of the fault is restored; if the fault downstream boundary switch does not send a locking signal, it is determined that the fault downstream boundary switch loses the locking signal, and the fault downstream boundary switch needs to be remotely controlled to be closed and then opened, so that the locking of the voltage time type switch downstream of the fault is realized by controlling the fault downstream boundary switch to be closed and then opened, the isolation operation of the fault is completed, and finally the power supply of the non-fault area is restored by closing the looped network switch.

[0085] Preferably, the fault downstream isolation and the power supply restoration of the non-fault area according to the fault upstream boundary switch and the fault downstream boundary switch comprise:

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

[0087] S78, if yes, then controlling the fault downstream boundary switch to be opened, and controlling the looped network switch on the fault feeder to be closed;

[0088] S79, if not, then controlling the fault downstream boundary switch to be closed and then opened in turn, and then controlling the looped network switch on the fault feeder to be closed, so that the fault downstream boundary switch completes the locking and the fault area isolation is completed.

[0089] In a preferred embodiment of the present application, according to the fault upstream boundary switch, the fault downstream boundary switch is found by topological relationship traversal, if the fault downstream boundary switch is a step difference circuit breaker, the switch is remotely controlled to be opened to realize the fault downstream isolation, and then the looped network switch is remotely controlled to be closed to realize the power supply restoration of the non-fault area; if the fault downstream boundary switch is a voltage time type switch, it is determined that the locking signal is lost, the locking of the voltage time type switch downstream of the fault is realized by controlling the fault downstream boundary switch to be closed and then opened, the isolation operation of the fault is completed, and finally the power supply of the non-fault area is restored by closing the looped network switch.

[0090] As Figure 5As shown, the fault downstream boundary switch K3 is a voltage time type switch, it is judged that K3 loses the blocking signal, the fault downstream voltage time type switch is blocked through the way of controlling the combination of the fault downstream boundary switch first and then controlling the combination, the isolation operation of the fault is completed, and finally the non-fault area is powered by closing the ring network switch.

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

[0092] S8, when it is determined that the end over-current 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 be closed.

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

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

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

[0097] In a preferred embodiment of the present application, when it is determined that the end over-current switch is in the closed state and there is no blocking signal, it is judged that it may be switch failure and no blocking signal, terminal mis-signaling, model topology error or missing blocking signal, for this case, the self-healing is blocked for the safety of power supply.

[0098] If there is a switch in the open state upstream of the target voltage time type switch that sends the blocking signal, according to all the signals collected by the power distribution master station, this case is more complex, switch failure, terminal mis-signaling, incorrect self-healing information of the switch, unreasonable protection setting and master station model topology error all affect the judgment of the fault point, so for this case, the self-healing is blocked for the safety of power supply.

[0099] This embodiment provides a feeder fault self-healing method, which constructs a fault feeder model based on the opening and closing signals, locking signals, and position information of several switches installed on the fault feeder, and then determines the end overcurrent switch that has tripped and is located at the end of the fault feeder based on the fault feeder model, and then determines the upstream boundary switch and the downstream boundary switch of the fault based on the opening and closing status of the end overcurrent switch, so that the fault area can be accurately located based on the upstream boundary switch and the downstream boundary switch of the fault. Therefore, the present invention no longer locates the fault based solely on 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 feeder self-healing, effectively avoiding the situation where the voltage-time type switch's under-voltage opening and locking are mistakenly triggered, thereby causing the fault location range to expand, and effectively improving power supply reliability.

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

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

[0102] A model construction module is used to 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 connection relationships of multiple switches installed on the fault feeder;

[0103] a switch determination module, configured to determine, based on 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] a second fault locating module configured to, if not, search for a target voltage-time type switch corresponding to the blocking signal when it is determined that there is only one blocking signal; and when it is determined based on the fault feeder model that there is no switch in an open state upstream of the target voltage-time type switch, determine the target voltage-time type switch as the fault upstream boundary switch, and determine a 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 a faulty section, and then isolate the faulty section and restore power supply to non-faulty areas.

[0107] Furthermore, isolating the fault downstream and restoring power supply to non-fault areas based on the faulty upstream boundary switch and the faulty downstream boundary switch 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 on 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 illustrative, 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 across multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment. In addition, in the 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 can understand and implement the present invention without inventive effort.

[0112] Those skilled in the art will 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, comprising 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 computer, 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, connecting various parts of the entire terminal device using various interfaces and lines.

[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 based on 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 device.

[0117] Another preferred embodiment of the present invention provides a storage medium, which is a computer-readable storage medium, and the computer program is stored in the computer-readable storage medium. When the computer program is executed by the processor, it can implement the steps of the above-mentioned various method embodiments. 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. The computer-readable medium may include: any entity or device that can carry the computer program code, a recording medium, a USB flash drive, a mobile hard disk, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunications signal, and a software distribution medium.

[0118] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles 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 several switches installed on the fault feeder; Constructing 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 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 so, the terminal 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 section, and then the faulty downstream is isolated based on 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 step of isolating the fault downstream and restoring power supply to the non-fault area based on the fault upstream boundary switch and the fault downstream boundary switch 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 on 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 according to claim 1, characterized in that: The step of isolating the fault downstream and restoring power supply to the non-fault area based on the fault upstream boundary switch and the fault downstream boundary switch 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 fault feeder to close; If not, the fault downstream boundary switch is controlled to be closed and 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 step of isolating the fault downstream and restoring power supply to the non-fault area based on the fault upstream boundary switch and the fault downstream boundary switch 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 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 terminal 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 be closed.

6. A feeder fault self-healing method according to claim 1, characterized in that: Also includes: When it is determined that the terminal overcurrent switch is in a closed state and there is no blocking 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 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 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 is 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 construction module is used to 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 connection relationships of multiple switches installed on the fault feeder; a switch determination module, configured to determine, based on the fault feeder model, the end overcurrent switch located at the end upstream of the fault, and determine whether the end overcurrent switch is in an open state; A first fault locating module is configured to, if yes, determine that 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; a second fault locating module configured to, if not, search for a target voltage-time type switch corresponding to the blocking signal when it is determined that there is only one blocking signal; and when it is determined based on the fault feeder model that there is no switch in an open state upstream of the target voltage-time type switch, determine the target voltage-time type switch as the fault upstream boundary switch, and determine a 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 according to claim 7, characterized in that: The step of isolating the fault downstream and restoring power supply to the non-fault area based on the fault upstream boundary switch and the fault downstream boundary switch 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 on 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 according to 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 the feeder fault self-healing method according to any one of claims 1 to 6.

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