A regional self-healing method for power distribution system

Abstract

The present invention provides a regional self-healing method for a power distribution system, which relates to the technical field of power distribution system control, and includes: first, each switch obtains the network topology state of the power distribution system, and configures its own current positive direction according to the network topology state; then each switch performs real-time current detection, and when the current detection result indicates that it has an overcurrent alarm, generates an overcurrent alarm signal containing the overcurrent direction and sends it to each switch that has an adjacent relationship with itself; then each switch performs a tripping action according to its own category information, the overcurrent alarm signal generated by itself, and the overcurrent alarm signal sent by each switch that has an adjacent relationship with itself to perform overcurrent protection in the fault area; finally, each switch that performs the tripping action detects and determines in real time whether the power distribution state of the fault area meets the preset closing condition: if so, performs a reclosing action to realize regional self-healing of the fault area. The beneficial effect is to realize simple and efficient regional self-healing of the power distribution system.

Description

Technical Field

[0001] The present invention relates to the technical field of power distribution system control, and in particular to a regional self-healing method for a power distribution system. Background Art

[0002] Regional fault self-healing in the distribution system is a crucial part of traditional distribution automation. In recent years, combined with actual field applications and technological development, a variety of fault self-healing solutions have been formed, mainly including: centralized feeder automation; conventional protection and reclosing combined with centralized feeder automation; local feeder automation; intelligent distributed feeder automation, etc.

[0003] The use of a high proportion of distributed power generation access in new power systems may cause an increase or decrease in the fault characteristic current when achieving regional self-healing; and the existence of distributed energy will also affect fault handling and self-healing mechanisms.

[0004] The grid scenarios of new power systems are complex and changeable, and traditional feeder automation fault self-healing solutions are no longer applicable. In addition, centralized feeder automation is currently commonly used in some new power grids, which has high requirements for the master station, takes a long time to restore power supply, and requires a lot of manual effort. Summary of the invention

[0005] In view of the problems existing in the prior art, the present invention provides a regional self-healing method for a power distribution system, wherein a plurality of switches are configured in the power distribution system, each of the switches establishes a connection relationship according to a pre-configured distribution network frame structure, and each of the switches is respectively configured with its own category information and switch information of switches that are adjacent to itself; the regional self-healing method comprises:

[0006] Step S1, each of the switches obtains a network topology state of the power distribution system, and configures its own current positive direction according to the network topology state;

[0007] Step S2, each of the switches performs real-time current detection, and when the current detection result indicates that it has an overcurrent alarm, generates an overcurrent alarm signal including the overcurrent direction and sends the overcurrent alarm signal to each of the switches that are adjacent to it according to the switch information;

[0008] Step S3, each switch performs a tripping action to perform overcurrent protection in the fault area according to its own category information, the overcurrent alarm signal generated by itself, and the overcurrent alarm signal sent by each switch that is adjacent to itself;

[0009] Step S4, each of the switches performing the tripping action detects in real time and determines whether the power distribution state of the fault area meets the preset closing condition:

[0010] If yes, a reclosing action is performed to achieve regional self-healing of the fault area;

[0011] If not, return to step S4.

[0012] Preferably, the power distribution system includes multiple substations, and the category information configured in each of the switches includes a section switch, a connecting switch and a branch switch, wherein the connecting switch is used to connect the substations, and each of the substations is configured with multiple section switches and branch switches.

[0013] Preferably, the step S1 comprises:

[0014] Step S11: Each of the segment switches, each of the tie switches, and each of the branch switches determines whether it is the first time to obtain the network topology state:

[0015] If yes, then set the current positive direction according to the current network topology state, and then go to step S2;

[0016] If not, go to step S12;

[0017] Step S12: Each of the segment switches and each of the tie switches determines whether the current network topology state is consistent with the network topology state obtained for the first time:

[0018] If yes, go to step S2;

[0019] If not, the current direction will be reversed and used as the positive direction of the current.

[0020] Preferably, when the category information configured in the switch is the segmented switch, the corresponding switch information includes an upstream switch, a downstream switch, an upper branch switch and a lower branch switch, then step S2 includes:

[0021] Step S21a, the segment switch performs real-time current detection, and determines whether there is overcurrent according to the corresponding current detection result:

[0022] If yes, go to step S22a;

[0023] If not, return to step S21a;

[0024] Step S22a, the segment switch determines whether the current direction is consistent with its own positive current direction according to the current detection result:

[0025] If yes, a forward overcurrent alarm signal is generated as the overcurrent alarm signal, and the overcurrent alarm signal is sent to the upstream switch, the downstream switch, the upper branch switch and the lower branch switch that are adjacent to the upstream switch;

[0026] If not, a reverse overcurrent alarm signal is generated as the overcurrent alarm signal, and the overcurrent alarm signal is sent to the upstream switch, the downstream switch, the upper branch switch and the lower branch switch that are adjacent to the upstream switch, the downstream switch and the upper branch switch;

[0027] Then the step S3 comprises:

[0028] Step S31a, the section switch determines whether the over-current alarm signal issued by itself is a forward over-current alarm signal:

[0029] If yes, go to step S32a;

[0030] If not, go to step S33a;

[0031] Step S32a, the segment switch determines whether the forward overcurrent alarm signal sent by the downstream switch or the lower branch switch is received within a preset information interaction time limit:

[0032] If yes, return to step S21a;

[0033] If not, a forward tripping action is performed after a preset delay time to perform overcurrent protection in the fault area, and then the process goes to step S4;

[0034] Step S33a, the section switch determines whether the reverse overcurrent alarm signal sent by the upstream switch or the upper branch switch is received within a preset information interaction time limit:

[0035] If yes, return to step S21a;

[0036] If not, a reverse tripping action is performed after a preset delay time to perform overcurrent protection in the fault area, and then the process goes to step S4.

[0037] Preferably, when the category information configured in the switch is the branch switch, the corresponding switch information includes an upstream switch, a downstream switch, and other branch switches, then step S2 includes:

[0038] In step S21b, the branch switch performs real-time current detection, and determines whether there is overcurrent according to the current detection result:

[0039] If yes, go to step S22b;

[0040] If not, return to step S21b;

[0041] Step S22b, the branch switch determines whether the current direction is consistent with its own positive current direction according to the current detection result:

[0042] If yes, a forward overcurrent alarm signal is generated as the overcurrent alarm signal, and the overcurrent alarm signal is sent to the upstream switch, the downstream switch and the other branch switches that are adjacent to the upstream switch;

[0043] If not, a reverse overcurrent alarm signal is generated as the overcurrent alarm signal, and the overcurrent alarm signal is sent to the upstream switch, the downstream switch and the other branch switches that are adjacent to the upstream switch;

[0044] Then the step S3 comprises:

[0045] Step S31b, the branch switch determines whether the received over-current alarm signal is a forward over-current alarm signal:

[0046] If yes, go to step S32b;

[0047] If not, go to step S33b;

[0048] Step S32b, the branch switch determines whether the forward overcurrent alarm signal sent by the downstream switch is received within a preset information interaction time limit:

[0049] If yes, return to step S21b;

[0050] If not, a forward tripping action is performed after a preset delay time to perform overcurrent protection in the fault area, and then the process goes to step S4;

[0051] Step S33b, the branch switch determines whether only one reverse overcurrent alarm signal sent by the upstream switch is received within a preset information interaction time limit:

[0052] If yes, then a reverse tripping action is performed after a preset delay time to perform overcurrent protection in the fault area, and then the process goes to step S4;

[0053] If not, return to step S21b.

[0054] Preferably, step S4 comprises:

[0055] Step S41a, the switch determines whether to perform a forward tripping action:

[0056] If yes, go to step S42a;

[0057] If not, go to step S43a;

[0058] Step S42a, the switch detects in real time and determines whether the power distribution state of the fault area meets the preset closing condition:

[0059] If yes, then execute the reclosing action and send a reclosing success signal to each of the switches that are adjacent to itself according to the switch information;

[0060] If not, return to step S42a;

[0061] Step S43a, the switch determines whether a positive incoming call is detected and a successful reclosing signal from the upstream switch is received within the preset longest reclosing waiting time:

[0062] If yes, then execute the reclosing action and send a reclosing success signal to each of the switches that are adjacent to itself according to the switch information;

[0063] If not, return to step S43a.

[0064] Preferably, when the category information configured in the switch is the tie switch, each tie switch is pre-configured with a load transfer time, and the corresponding switch information includes an upstream switch, a downstream switch, an upper branch switch and a lower branch switch, and the tie switch is configured to be normally open, then step S4 further includes:

[0065] Step S41b: the tie switch performs real-time voltage detection on the upstream switch, the upper branch switch, the downstream switch, and the lower branch switch, and determines whether the voltage states between the upstream switch and the downstream switch connected to the tie switch are consistent, or between the upper branch switch and the lower branch switch connected to the tie switch, according to the voltage detection result:

[0066] If yes, go to step S41b;

[0067] If not, the tie switch performs a reclosing action and sends a reclosing success signal to the upstream switch, the downstream switch, the upper branch switch and the lower branch switch according to the switch information.

[0068] Preferably, the switch information of the switch corresponding to each switch and having an adjacent relationship with itself includes an upstream switch, and after step S3, the following is further included:

[0069] After the upstream switch corresponding to each of the switches that have not performed the tripping action performs the tripping action, it is determined whether the forward power is lost continuously within the preset longest reclosing waiting time:

[0070] If yes, the tripping action is executed and the reclosing action is not executed within the preset blocking time;

[0071] If not, go to step S2.

[0072] The above technical solution has the following advantages or beneficial effects: each branch switch and section switch in the distribution system trips according to the directional overcurrent alarm signal, and automatically closes when the closing conditions are met, which can effectively realize the overcurrent protection of the distribution system. The connecting switch enables the normal substation to assist the faulty substation in supplying power, realizes self-healing of the faulty area, and there is no need for the control station to control each switch, achieving efficient and automatic effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0073] Figure 1 A schematic flow chart of a regional self-healing method for a power distribution system in a preferred embodiment of the present invention;

[0074] Figure 2 1 is a flow chart of step S1 of a regional self-healing method for a power distribution system in a preferred embodiment of the present invention;

[0075] Figure 3 Schematic diagram of a sub-flow of step S2 when the switch is a segmented switch in a preferred embodiment of the present invention;

[0076] Figure 4 This is a schematic diagram of a sub-flow of step S3 when the switch is a segmented switch in a preferred embodiment of the present invention;

[0077] Figure 5 This is a sub-flow diagram of step S2 when the switch is a branch switch in a preferred embodiment of the present invention;

[0078] Figure 6 This is a schematic diagram of a sub-flow of step S3 when the switch is a branch switch in a preferred embodiment of the present invention;

[0079] Figure 7 This is a sub-flow diagram of step S4 when the switch is a branch switch and a segment switch in a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0080] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. The present invention is not limited to this embodiment, and other embodiments may also fall within the scope of the present invention as long as they conform to the gist of the present invention.

[0081] In a preferred embodiment of the present invention, based on the above-mentioned problems existing in the prior art, a regional self-healing method for a power distribution system is provided. A plurality of switches are configured in the power distribution system. Each switch establishes a connection relationship according to a pre-configured distribution network frame structure. Each switch is respectively configured with its own category information and switch information of switches that are adjacent to itself; Figure 1 As shown, the regional self-healing methods include:

[0082] Step S1, each switch obtains the network topology state of the power distribution system, and configures its own current positive direction according to the network topology state;

[0083] Step S2, each switch performs real-time current detection, and when the current detection result indicates that it has an overcurrent alarm, generates an overcurrent alarm signal including the overcurrent direction and sends the overcurrent alarm signal to each switch that is adjacent to itself according to the switch information;

[0084] Step S3, each switch performs a tripping action to perform overcurrent protection in the fault area according to its own category information, the overcurrent alarm signal generated by itself, and the overcurrent alarm signal sent by each switch that is adjacent to itself;

[0085] Step S4, each switch performing the tripping action detects in real time and determines whether the power distribution state of the fault area meets the preset closing condition:

[0086] If so, a reclosing action is performed to achieve regional self-healing of the faulty area;

[0087] If not, return to step S4.

[0088] In a preferred embodiment of the present invention, the power distribution system includes multiple substations, and the category information configured in each switch includes a section switch, a connecting switch and a branch switch, wherein the connecting switch is used to connect the substations, and each substation is configured with multiple section switches and branch switches.

[0089] In a preferred embodiment of the present invention, Figure 2 As shown, step S1 includes:

[0090] Step S11: Each segment switch, each tie switch and each branch switch determines whether it is the first time to obtain the network topology state:

[0091] If yes, then set its own current positive direction according to the current network topology state, and then go to step S2;

[0092] If not, go to step S12;

[0093] Step S12: Each segment switch and each tie switch determines whether the current network topology state is consistent with the network topology state obtained for the first time:

[0094] If yes, go to step S2;

[0095] If not, the current direction will be reversed and used as the positive direction of the current.

[0096] Specifically, in the present embodiment, each substation of the power distribution system is provided with a plurality of section switches and a plurality of branch switches, and a connecting switch is provided between each substation; when the power distribution system is started for the first time, each switch will obtain an initial network topology state, and set its own positive current direction according to the network topology state. During the operation of the power distribution system, the network topology state will change. When the section switch and the connecting switch determine that the current network topology state is inconsistent with the network topology state obtained for the first time, they will reverse their current current direction as their own positive current direction, and the positive current direction of the branch switch does not need to change according to the network topology state.

[0097] In a preferred embodiment of the present invention, when the category information configured in the switch is a segmented switch, the corresponding switch information includes an upstream switch, a downstream switch, an upper branch switch and a lower branch switch, such as Figure 3 and Figure 4 As shown, step S2 includes:

[0098] Step S21a, the segment switch performs real-time current detection, and determines whether there is overcurrent according to the corresponding current detection result:

[0099] If yes, go to step S22a;

[0100] If not, return to step S21a;

[0101] Step S22a, the segment switch determines whether the current direction is consistent with its own positive current direction according to the current detection result:

[0102] If yes, a forward overcurrent alarm signal is generated as an overcurrent alarm signal, and the overcurrent alarm signal is sent to the upstream switch, the downstream switch, the upper branch switch and the lower branch switch that are adjacent to the switch;

[0103] If not, a reverse overcurrent alarm signal is generated as an overcurrent alarm signal, and the overcurrent alarm signal is sent to the upstream switch, the downstream switch, the upper branch switch and the lower branch switch that are adjacent to the switch;

[0104] Then step S3 includes:

[0105] Step S31a, the sectionalizer determines whether the over-current alarm signal issued by itself is a forward over-current alarm signal:

[0106] If yes, go to step S32a;

[0107] If not, go to step S33a;

[0108] Step S32a, the segment switch determines whether it has received a forward overcurrent alarm signal from a downstream switch or a lower branch switch within a preset information interaction time limit:

[0109] If yes, return to step S21a;

[0110] If not, a forward tripping action is performed after a preset delay time to perform overcurrent protection in the fault area, and then the process goes to step S4;

[0111] Step S33a, the sectionalizing switch determines whether a reverse overcurrent alarm signal sent by an upstream switch or an upper branch switch is received within a preset information interaction time limit:

[0112] If yes, return to step S21a;

[0113] If not, a reverse tripping action is performed after a preset delay time to perform overcurrent protection in the fault area, and then the process goes to step S4;

[0114] Specifically, in this embodiment, when the configuration information of the current switch is a segmented switch, each switch will configure the switch information of the switch that is adjacent to itself as an upstream switch, a downstream switch, an upper branch switch and a lower branch switch according to the connection relationship and its own positive current direction. When its own positive current direction changes, the switches corresponding to its own upstream switch, downstream switch, upper branch switch and lower branch switch will also be adjusted accordingly.

[0115] When overcurrent occurs, a corresponding forward overcurrent alarm signal or reverse overcurrent alarm signal is generated according to its own positive current direction and the detected current current direction and sent to its own upstream switch, downstream switch, upper branch switch and lower branch switch.

[0116] When it sends out a positive overcurrent alarm signal, and the current overcurrent direction is consistent with its own positive current direction, it is necessary to determine whether it has received the positive overcurrent alarm signal issued by the downstream switch and the lower branch switch. If it has, it means that it is not the last switch in the current current path, and it continues to perform current detection to determine whether there is overcurrent; if it has not, it means that it is the last switch in the current current path, and it is necessary to perform a tripping action to perform overcurrent protection in the fault area to ensure the safety of the substation.

[0117] On the contrary, when it sends out a reverse overcurrent alarm signal, the current overcurrent direction is inconsistent with its own positive current direction. It is necessary to determine whether the reverse overcurrent alarm signal issued by the upstream switch and the upper branch switch is received. If it is received, it means that it is not the last switch in the current current path, and continue to perform current detection to determine whether there is overcurrent; if it is not received, it means that it is the last switch in the current current path. At this time, it is necessary to execute a tripping action to perform overcurrent protection in the fault area to ensure the safety of the substation.

[0118] In a preferred embodiment of the present invention, when the category information configured in the switch is a branch switch, the corresponding switch information includes an upstream switch, a downstream switch, and other branch switches, such as Figure 5 and Figure 6 As shown, step S2 includes:

[0119] Step S21b, the branch switch performs real-time current detection, and determines whether there is overcurrent according to the current detection result:

[0120] If yes, go to step S22b;

[0121] If not, return to step S21b;

[0122] Step S22b: The branch switch determines whether the current direction is consistent with its own positive current direction according to the current detection result:

[0123] If yes, a forward overcurrent alarm signal is generated as an overcurrent alarm signal, and an overcurrent alarm signal is sent to the upstream switch, the downstream switch and other branch switches that are adjacent to the switch;

[0124] If not, a reverse overcurrent alarm signal is generated as an overcurrent alarm signal, and an overcurrent alarm signal is sent to the upstream switch, the downstream switch and other branch switches that are adjacent to the switch;

[0125] Then step S3 includes:

[0126] Step S31b, the branch switch determines whether the received over-current alarm signal is a forward over-current alarm signal:

[0127] If yes, go to step S32b;

[0128] If not, go to step S33b;

[0129] Step S32b, the branch switch determines whether it has received a forward overcurrent alarm signal from a downstream switch within a preset information interaction time limit:

[0130] If yes, return to step S21b;

[0131] If not, a forward tripping action is performed after a preset delay time to perform overcurrent protection in the fault area, and then the process goes to step S4;

[0132] Step S33b, the branch switch determines whether it has received only one reverse overcurrent alarm signal sent by the upstream switch within the preset information interaction time limit:

[0133] If yes, then a reverse tripping action is performed after a preset delay time to perform overcurrent protection in the fault area, and then the process goes to step S4;

[0134] If not, return to step S21b;

[0135] Specifically, in this embodiment, when the current switch configuration information is a branch switch, each branch switch configures the switch information of the switch adjacent to itself as an upstream switch, a downstream switch and other branch switches according to the connection relationship and its own positive current direction.

[0136] When overcurrent occurs, a corresponding forward overcurrent alarm signal or a reverse overcurrent alarm signal is generated according to its own positive current direction and the detected current current direction and sent to its own upstream switch, downstream switch and other branch switches.

[0137] When it sends out a positive overcurrent alarm signal, and the current overcurrent direction is consistent with its own positive current direction, it is necessary to determine whether it has received the positive overcurrent alarm signal issued by the downstream switch. If it has, it means that it is not the last switch in the current current path, and it continues to perform current detection to determine whether there is overcurrent. If it has not, it means that it is the last switch in the current current path, and it is necessary to perform a tripping action to perform overcurrent protection in the fault area to ensure the safety of the substation.

[0138] On the contrary, when it sends out a reverse overcurrent alarm signal, the current overcurrent direction is inconsistent with its own positive current direction, then it is necessary to determine whether it has only received a reverse overcurrent alarm signal from an upstream switch. If so, it is necessary to perform a tripping action to perform overcurrent protection in the fault area to ensure the safety of the substation; if not, continue to perform current detection to determine whether there is overcurrent.

[0139] In a preferred embodiment of the present invention, Figure 7 As shown, step S4 includes:

[0140] Step S41a, the switch determines whether to perform a forward tripping action:

[0141] If yes, go to step S42a;

[0142] If not, go to step S43a;

[0143] Step S42a, the switch detects in real time and determines whether the power distribution state of the fault area meets the preset closing condition:

[0144] If yes, the reclosing action is executed and a reclosing success signal is sent to each switch that is adjacent to itself according to the switch information;

[0145] If not, return to step S42a;

[0146] Step S43a, the switch determines whether a positive incoming call is detected and a successful reclosing signal from an upstream switch is received within the preset longest reclosing waiting time:

[0147] If yes, the reclosing action is executed and a reclosing success signal is sent to each switch that is adjacent to itself according to the switch information;

[0148] If not, return to step S43a.

[0149] Specifically, in this embodiment, the switch performing the forward tripping action determines whether the power distribution state of the fault area meets the closing condition. If it meets the condition, the reclosing action is performed and a reclosing success signal is sent to the upstream switch, the downstream switch, the upper branch switch, and the lower branch switch to complete the self-healing of the fault area. When the switch performing the reverse tripping detects the forward incoming call and receives the reclosing success signal sent by the upstream switch, it means that the closing condition is met, and a reclosing success signal is sent to the upstream switch, the downstream switch, the upper branch switch, and the lower branch switch to complete the self-healing of the fault area. In this way, the self-healing of the fault area can be completed after the overcurrent protection trips, without the need for the main controller to coordinate and control, and the fault area is restarted, and the power supply of the non-fault area can be quickly restored.

[0150] In a preferred embodiment of the present invention, when the category information configured in the switch is a tie switch, each tie switch is pre-configured with a load transfer time, and the corresponding switch information includes an upstream switch, a downstream switch, an upper branch switch, and a lower branch switch. The tie switch is configured to be normally open, and step S4 further includes:

[0151] Step S41b: The tie switch performs real-time voltage detection on the upstream switch, the upper branch switch, the downstream switch, and the lower branch switch, and determines whether the voltage states between the upstream switch and the downstream switch connected to it, or between the upper branch switch and the lower branch switch connected to it are consistent according to the voltage detection result:

[0152] If yes, go to step S41b;

[0153] If not, the tie switch performs the reclosing action and sends a reclosing success signal to the upstream switch, downstream switch, upper branch switch and lower branch switch according to the switch information;

[0154] Specifically, in this embodiment, when the connecting switch installed between substations recognizes that the voltage states of the two switches connected to itself are inconsistent, it means that one of the connected substations has a fault and cannot supply power or the power supply is insufficient. At this time, the switch is closed to connect the substation with normal power supply and the substation with insufficient power supply to compensate for the power supply of the substation with insufficient power supply.

[0155] In a preferred embodiment of the present invention, the switch information of the switch that is adjacent to each switch includes the upstream switch, and after step S3, the following is further included:

[0156] After the upstream switches corresponding to the switches that have not executed the tripping action execute the tripping action, it is determined whether the positive power is lost during the preset longest reclosing waiting time:

[0157] If yes, the tripping action is executed and the reclosing action is not executed within the preset blocking time;

[0158] If not, go to step S2.

[0159] Specifically, in this embodiment, when a switch that has not detected overcurrent and has not executed a tripping action detects that an upstream switch has executed a tripping action, if there is a forward power loss during the longest reclosing waiting time, it means that the switch has a fault and will trip immediately. Reclosing action is not allowed within the preset lockout time to prevent damage to the substation.

[0160] The maximum reclosing waiting time configured in each switch can be adjusted according to the number and time of reclosing. The more times and the longer the time, the longer the maximum reclosing waiting time.

[0161] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the contents of this specification and illustrations should be included in the protection scope of the present invention.

Claims

1. A regional self-healing method for a power distribution system, characterized in that: The power distribution system is configured with a plurality of switches, each of which establishes a connection relationship according to a pre-configured power distribution network structure, and each of which is respectively configured with its own category information and switch information of switches that are adjacent to itself; Then the regional self-healing method includes: Step S1, each of the switches obtains a network topology state of the power distribution system, and configures its own current positive direction according to the network topology state; Step S2, each of the switches performs real-time current detection, and when the current detection result indicates that it has an overcurrent alarm, generates an overcurrent alarm signal including the overcurrent direction and sends the overcurrent alarm signal to each of the switches that are adjacent to it according to the switch information; Step S3, each switch performs a tripping action to perform overcurrent protection in the fault area according to its own category information, the overcurrent alarm signal generated by itself, and the overcurrent alarm signal sent by each switch that is adjacent to itself; Step S4, each of the switches performing the tripping action detects in real time and determines whether the power distribution state of the fault area meets the preset closing condition: If yes, a reclosing action is performed to achieve regional self-healing of the fault area; If not, return to step S4; The power distribution system includes a plurality of substations, the category information configured in each of the switches includes a section switch, a tie switch and a branch switch, wherein the tie switch is used to connect the substations, and each of the substations is configured with a plurality of the section switches and the branch switches; When the category information configured in the switch is the segment switch, the corresponding switch information includes an upstream switch, a downstream switch, an upper branch switch and a lower branch switch, and step S2 includes: Step S21a, the segment switch performs real-time current detection, and determines whether there is overcurrent according to the corresponding current detection result: If yes, go to step S22a; If not, return to step S21a; Step S22a, the segment switch determines whether the current direction is consistent with its own positive current direction according to the current detection result: If yes, a forward overcurrent alarm signal is generated as the overcurrent alarm signal, and the overcurrent alarm signal is sent to the upstream switch, the downstream switch, the upper branch switch and the lower branch switch that are adjacent to the upstream switch; If not, a reverse overcurrent alarm signal is generated as the overcurrent alarm signal, and the overcurrent alarm signal is sent to the upstream switch, the downstream switch, the upper branch switch and the lower branch switch that are adjacent to the upstream switch, the downstream switch and the upper branch switch; Then the step S3 comprises: Step S31a, the sectionalizer determines whether the over-current alarm signal issued by itself is a forward over-current alarm signal: If yes, go to step S32a; If not, go to step S33a; Step S32a, the segment switch determines whether the forward overcurrent alarm signal sent by the downstream switch or the lower branch switch is received within a preset information interaction time limit: If yes, return to step S21a; If not, a forward tripping action is performed after a preset delay time to perform overcurrent protection in the fault area, and then the process goes to step S4; Step S33a, the section switch determines whether the reverse overcurrent alarm signal sent by the upstream switch or the upper branch switch is received within a preset information interaction time limit: If yes, return to step S21a; If not, a reverse tripping action is performed after a preset delay time to perform overcurrent protection in the fault area, and then the process goes to step S4.

2. The regional self-healing method according to claim 1, characterized in that: The step S1 comprises: Step S11: Each of the segment switches, each of the tie switches, and each of the branch switches determines whether it is the first time to obtain the network topology state: If yes, then set the current positive direction according to the current network topology state, and then go to step S2; If not, go to step S12; Step S12: Each of the segment switches and each of the tie switches determines whether the current network topology state is consistent with the network topology state obtained for the first time: If yes, go to step S2; If not, the current direction will be reversed and used as the positive direction of the current.

3. The regional self-healing method according to claim 1, characterized in that: When the category information configured in the switch is the branch switch, the corresponding switch information includes an upstream switch, a downstream switch, and other branch switches, then step S2 includes: Step S21b, the branch switch performs real-time current detection, and determines whether there is overcurrent according to the current detection result: If yes, go to step S22b; If not, return to step S21b; Step S22b, the branch switch determines whether the current direction is consistent with its own positive current direction according to the current detection result: If yes, a forward overcurrent alarm signal is generated as the overcurrent alarm signal, and the overcurrent alarm signal is sent to the upstream switch, the downstream switch and the other branch switches that are adjacent to the upstream switch; If not, a reverse overcurrent alarm signal is generated as the overcurrent alarm signal, and the overcurrent alarm signal is sent to the upstream switch, the downstream switch and the other branch switches that are adjacent to the upstream switch; Then the step S3 comprises: Step S31b, the branch switch determines whether the received over-current alarm signal is a forward over-current alarm signal: If yes, go to step S32b; If not, go to step S33b; Step S32b, the branch switch determines whether the forward overcurrent alarm signal sent by the downstream switch is received within a preset information interaction time limit: If yes, return to step S21b; If not, a forward tripping action is performed after a preset delay time to perform overcurrent protection in the fault area, and then the process goes to step S4; Step S33b, the branch switch determines whether only one reverse overcurrent alarm signal sent by the upstream switch is received within a preset information interaction time limit: If yes, then a reverse tripping action is performed after a preset delay time to perform overcurrent protection in the fault area, and then the process goes to step S4; If not, return to step S21b.

4. The regional self-healing method according to claim 1 or 3, characterized in that: The step S4 comprises: Step S41a, the switch determines whether to perform a forward tripping action: If yes, go to step S42a; If not, go to step S43a; Step S42a, the switch detects in real time and determines whether the power distribution state of the fault area meets the preset closing condition: If yes, then execute the reclosing action and send a reclosing success signal to each of the switches that are adjacent to itself according to the switch information; If not, return to step S42a; Step S43a, the switch determines whether a positive incoming call is detected and a successful reclosing signal from the upstream switch is received within the preset longest reclosing waiting time: If yes, then execute the reclosing action and send a reclosing success signal to each of the switches that are adjacent to itself according to the switch information; If not, return to step S43a.

5. The regional self-healing method according to claim 1, characterized in that: When the category information configured in the switch is the tie switch, each tie switch is pre-configured with a load transfer time, and the corresponding switch information includes an upstream switch, a downstream switch, an upper branch switch and a lower branch switch, and the tie switch is configured to be normally open, then step S4 further includes: Step S41b: the tie switch performs real-time voltage detection on the upstream switch, the upper branch switch, the downstream switch, and the lower branch switch, and determines whether the voltage states between the upstream switch and the downstream switch connected to the tie switch are consistent, or between the upper branch switch and the lower branch switch connected to the tie switch, according to the voltage detection result: If yes, go to step S41b; If not, the tie switch performs a reclosing action and sends a reclosing success signal to the upstream switch, the downstream switch, the upper branch switch and the lower branch switch according to the switch information.

6. The regional self-healing method according to claim 1, characterized in that: The switch information of the switch corresponding to each switch and having an adjacent relationship with itself includes an upstream switch, and after step S3, further includes: After the upstream switch corresponding to each of the switches that have not performed the tripping action performs the tripping action, it is determined whether the forward power is lost continuously within the preset longest reclosing waiting time: If yes, the tripping action is executed and the reclosing action is not executed within the preset blocking time; If not, go to step S2.

Images