A two-wire three-station double-chain area self-healing control system and method

Abstract

The application discloses a two-line three-station double-chain area self-healing control system and method, and the method comprises the following steps: each self-healing device collects analog quantity and switch quantity information of a corresponding string supply station and carries out information interaction, and when chain type string supply main wiring 1 and 2 are normally operated, an open loop point in the corresponding main wiring is identified, and the self-healing action logic of the chain type string supply main wiring is configured according to the open loop point position; when any chain type string supply main wiring fails, fault analysis and self-healing closing are carried out based on the information exchanged between each self-healing device and the self-healing action logic of the chain type string supply main wiring area; if the self-healing closing is unsuccessful, local incoming line backup automatic switching logic is executed to carry out incoming line closing, and if the incoming line closing is unsuccessful, local sectionalization backup automatic switching logic is executed to jump the incoming line switch and close the sectionalization switch. The application can effectively solve the problem of power supply recovery when two-line three-station double-chain power supply fails and the problem that backup automatic switching cannot act when the optical fiber is abnormal.

Description

Technical Field

[0001] This application belongs to the field of power system backup automatic transfer technology, and relates to a self-healing control system and method applicable to a two-line, three-station, dual-chain area. Background Technology

[0002] With social development, higher requirements have been placed on the stability of the power system. Among them, the dual-chain power supply structure with two power supply points and two lines and three substations solves the problem of bearing and absorbing the large-scale access of distributed power sources by constructing a high-voltage distribution network target grid that is coordinated with the upper-level power grid, has a clear structure, and is safe and reliable, thus ensuring the safe and reliable operation of the distribution network.

[0003] In a two-line, three-station dual-chain series power supply system, there are typically two chain-type series power supply networks, each consisting of three series power supply stations. When one power source fails, it causes a loss of voltage at the relevant series power supply stations, which is usually restored by configuring an automatic transfer switch (ATS). A conventional standardized 110kV ATS can only connect to electrical quantities from three bays ("two incoming lines + one section"), using the ATS logic to switch between the main and backup power supplies. However, the two-line, three-station dual-chain series power supply structure has "four incoming lines + one section," meaning two incoming lines cannot connect to a conventional 110kV ATS, thus failing to fully utilize its power transfer capacity.

[0004] The patent application number 202310597699.3 proposes an automatic switching control method for backup power supply in a two-line, three-station, dual-chain structure. However, it requires five devices and relies on the inter-station communication network. When the fiber optic communication is abnormal, the chain automatic switching function is deactivated. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this application provides a self-healing control system and method applicable to a two-line, three-station, dual-chain area. It can realize three-level recovery logic, prioritize chain-type self-healing, quickly isolate faults and close open-loop points, trigger local incoming line backup automatic transfer after self-healing failure, so that it can still operate when the optical fiber is abnormal, and finally enable segmented backup automatic transfer to ensure power supply in extreme cases.

[0006] The technical solution adopted in this application is as follows.

[0007] The first aspect of this invention proposes a self-healing control system suitable for a two-line, three-station, dual-chain area, including a series supply station 1, a series supply station 2, and a series supply station 3;

[0008] Each series power supply station is equipped with its own self-healing device, which is used to collect analog and digital quantity information of the station and interact with the self-healing devices of other series power supply stations, as well as to execute the self-healing action logic of the chain-type series power supply main wiring, the local incoming line backup automatic transfer logic, and the local segment backup automatic transfer logic.

[0009] Each serial power supply station is connected to incoming line 1 and incoming line 2 connected to bus 1, incoming line 3 and incoming line 4 connected to bus 2, and the segmented bays connected between bus 1 and bus 2. Incoming line 1 and incoming line 2 are backups for each other, and incoming line 3 and incoming line 4 are backups for each other. The bays of incoming line 1 and incoming line 3 are bound to the bay of serial power supply station channel 1, and the bays of incoming line 2 and incoming line 4 are bound to the bay of serial power supply station channel 2.

[0010] The incoming lines 1, 2 and bus 1 of each series power supply station form a chain-type series power supply main connection 1, and the incoming lines 3, 4 and bus 2 of each series power supply station form a chain-type series power supply main connection 2.

[0011] Preferably, the system determines whether the corresponding series power supply station is a side station by setting the [whether the substation is a side station] parameter of the self-healing device; if the [whether the substation is a side station] parameter is set to 1, it means that the corresponding series power supply station is a side station and is adjacent to the power supply station; if the [whether the substation is a side station] parameter is set to 0, it means that the corresponding series power supply station is an intermediate station.

[0012] Preferably, the self-healing devices of each series power supply station have the same program and adopt a masterless networking mode to share information across the entire network through data interaction, without the need for a central node.

[0013] A second aspect of this invention proposes a self-healing control method applicable to a two-line, three-station, dual-chain region, comprising:

[0014] Each self-healing device collects analog and digital information from the corresponding series power supply station and performs information exchange. When the main wiring 1 and 2 of the chain-type series power supply are running normally, it identifies the open loop point in the corresponding main wiring and configures the self-healing action logic of the main wiring of the chain-type series power supply according to the position of the open loop point.

[0015] When any chain-type main wiring fails, fault analysis and self-healing gate are performed based on the information exchanged between the respective healing devices and the self-healing action logic of the chain-type main wiring area.

[0016] If the self-healing switch fails, the local incoming line backup automatic transfer logic is executed to close the incoming line. If the incoming line closing fails, the local section backup automatic transfer logic is executed to trip the incoming line switch and close the section switch.

[0017] Preferably, identifying the open-loop point in the corresponding main wiring during normal operation of the chain-type series power supply main wiring 1 and 2 includes:

[0018] Analyze the switch position status of the 6 incoming line intervals in each chain-type series power supply main wiring, and identify the incoming line interval where the switch position status is in the split position as the open loop point in the corresponding main wiring.

[0019] Preferably, the self-healing action logic for configuring the chain-type series power supply main wiring according to the open-loop point position includes:

[0020] (1) Set the charging logic for the corresponding open-loop device according to the open-loop point position, as follows:

[0021] (1.1) If the open-loop point is located at an intermediate station, then set the charging logic for the intermediate station open-loop point device:

[0022] a) Self-healing function activated; b) The [Substation side-station status] parameter set in the device is deactivated; c) Self-healing discharge conditions are not met; d) The busbar of this device is energized; e) Busbar energized indicators are received on both adjacent sides; f) No open-loop information flow is received on both adjacent sides.

[0023] If the above conditions are met simultaneously, the self-healing charging will be completed after a set delay, and a self-healing charging completion information stream will be sent to the self-healing devices on both sides.

[0024] (1.2) If the open-loop point is located at the side station, then set the charging logic for the side station open-loop point device:

[0025] a) Self-healing function is activated; b) The [whether the substation is a side station] parameter set in the device is activated; c) Self-healing discharge conditions are not met; d) The busbar of this device is energized; e) The busbar connected to the channel is energized and the voltage drawn from the line connected to the power station is energized; f) No open-loop information flow is received from the channel connected side.

[0026] If the above conditions are met simultaneously, the self-healing charging will be completed after a set delay, and a self-healing charging completion information stream will be sent to the adjacent self-healing device.

[0027] (2) Configure the charging logic for non-open-loop devices:

[0028] a) Self-healing function activated; b) Self-healing discharge conditions not met; c) This device's busbar is energized; d) Received self-healing charging completion information stream from the adjacent device in the channel;

[0029] If the above conditions are met simultaneously, the self-healing charging will be completed after a set delay, and a self-healing charging completion information stream will be sent to the adjacent device.

[0030] (3) Configure chain-type self-healing discharge logic:

[0031] a) Manual or remote tripping of any main line; b) Self-healing not activated and no voltage on either side for an extended period; c) Self-healing function deactivated; d) Near-end fault at the open loop point; e) Abnormality of any main line; f) Self-healing switch successful or failed; g) Open loop point closed or with current; h) Received a blocking self-healing input.

[0032] If any of the above conditions are met, the discharge will self-heal.

[0033] Preferably, the fault analysis and self-healing gate based on the information exchanged between the respective healing devices and the self-healing action logic of the chain-connected main wiring area includes:

[0034] Fault on the busbar of power supply 1: If the self-healing device of series power supply station 1 determines that there is no current at incoming line 1 switch, no voltage at busbar 1, and no voltage drawn from the line of incoming line 1 switch, then the incoming line 1 switch will trip after a self-healing trip delay; if the incoming line 1 switch of series power supply station 1 trips, a self-healing start command will be issued. If the self-healing device of series power supply station 2 receives the self-healing start command after self-healing charging is completed and there is no voltage on power supply 1 side and voltage on power supply 2 side, then the incoming line 2 switch of series power supply station 2 will close after a delay. Here, power supply 1 and power supply 2 refer to the connections of incoming line 1 and incoming line 3 of series power supply station 1, respectively. If the incoming line 1 switch of the series power supply station 1 fails to trip, after a failure delay, the incoming line 1, incoming line 2, and bus tie switches of the series power supply station 1 will trip, and a command to trip the incoming line 1 switch of the series power supply station 2 will be sent. When the self-healing device of the series power supply station 2 receives the command from the incoming line 1 after the self-healing charging is completed, it will immediately trip the incoming line 1 switch of the series power supply station 2. If the incoming line 1 switch of the series power supply station 2 trips, the incoming line 2 switch of the series power supply station 2 will be closed after a delay. If the incoming line 1 switch of the series power supply station 2 fails to trip, the self-healing discharge will occur, indicating that the self-healing circuit breaker has failed.

[0035] Power supply 2 busbar 1 fault: If the self-healing device of the series power supply station 3 determines that the incoming line 1 switch of the series power supply station 3 has no current and the busbar 1 has no voltage and the voltage drawn from the line of the incoming line 1 switch of the series power supply station 3 has no voltage, then the incoming line 1 switch of the series power supply station 3 will trip after a self-healing trip delay; if the incoming line 1 switch of the series power supply station 3 trips, then a self-healing start command will be issued. If the self-healing device of the series power supply station 2 receives the self-healing start command after the self-healing charging is completed and the busbar 1 of the series power supply station 2 has voltage and the incoming line of the incoming line 2 of the series power supply station 2 has no voltage, then the incoming line 2 switch of the series power supply station 2 will close after a delay; if the incoming line 1 switch of the series power supply station 3 fails to trip, then the self-healing discharge will occur.

[0036] Series power supply station bus fault: When the bus differential protection configured on the series power supply station bus operates and is connected to the self-healing input, the self-healing device of the series power supply station receives the bus differential protection operation and then self-heals and discharges.

[0037] Preferably, the fault analysis and self-healing gate based on the information exchanged between the respective healing devices and the self-healing action logic of the chain-connected main wiring area includes:

[0038] Line fault between power supply 1 and series power supply station 1:

[0039] a) The line protection device is operating normally:

[0040] If the line optical differential protection of the series power supply station 1 trips the outgoing line 1 and incoming line 1 of the power supply station 1, the self-healing device of the series power supply station 1 receives the protection action signal of the incoming line 1 switch, and the bus 1 is without voltage and the incoming line 1 switch is without current, then the incoming line 1 switch will trip after the self-healing trip delay.

[0041] If the incoming line 1 switch of series power supply station 1 trips, a self-healing start command is issued. When the self-healing device of series power supply station 2 receives the self-healing start command from series power supply station 1 after the self-healing charging is completed and power supply 1 is de-energized and power supply 2 is energized, the incoming line 2 switch of series power supply station 2 is closed after a delay.

[0042] If the incoming line 1 switch of series power supply station 1 fails to trip, after a failure delay, incoming line 1, incoming line 2, and bus tie switches of series power supply station 1 will send a command to trip the incoming line 1 switch of series power supply station 2. When the self-healing device of series power supply station 2 receives the command to trip the incoming line 1 switch after the self-healing charging is completed, it will immediately trip the incoming line 1 switch of series power supply station 2. If the incoming line 1 switch of series power supply station 2 trips, the incoming line 2 switch of series power supply station 2 will be closed after a delay. If the incoming line 1 switch of series power supply station 2 fails to trip, the self-healing discharge will occur.

[0043] b) Line protection device fails to operate:

[0044] If the self-healing device of the series power supply station 1 does not receive the protection action signal of the incoming line 1 switch, the self-healing device of the series power supply station 1 determines that the incoming line 1 switch has no current, the bus 1 has no voltage, and the voltage drawn from the line of the incoming line 1 switch is no voltage, and then the incoming line 1 switch trips after the self-healing trip delay.

[0045] If the incoming line 1 switch of series power supply station 1 trips, a self-healing start command is issued. When the self-healing device of series power supply station 2 receives the self-healing start command after the self-healing charging is completed and there is no voltage on the power supply 1 side and voltage on the power supply 2 side, the incoming line 2 switch of series power supply station 2 is closed after a delay.

[0046] If the incoming line 1 switch of the series power supply station 1 fails to trip, after a failure delay, the incoming line 1, incoming line 2, and bus tie switches of the series power supply station 1 will trip, and a command to trip the incoming line 1 switch of the series power supply station 2 will be sent. When the self-healing device of the series power supply station 2 receives the command to trip the incoming line 1 switch after the self-healing charging is completed, it will immediately trip the incoming line 1 switch of the series power supply station 2. If the incoming line 1 switch of the series power supply station 2 trips, the incoming line 2 switch of the series power supply station 2 will be closed after a delay. If the incoming line 1 switch of the series power supply station 2 fails to trip, the self-healing discharge will occur, indicating that the self-healing circuit breaker has failed.

[0047] Preferably, the fault analysis and self-healing gate based on the information exchanged between the respective healing devices and the self-healing action logic of the chain-connected main wiring area includes:

[0048] For faults in other lines besides incoming lines 1 and 2 of the series power supply station 1: the protection of other lines trips the corresponding switches of other lines. If the corresponding switches of other lines are open, no self-healing action is required. If the corresponding switches of other lines fail to trip, the backup protection of the power supply 1 outgoing line protection device trips the power supply 1 outgoing line switch. If both incoming lines 1 and 2 of the series power supply station 1 have no current and the differential protection of the bus of the series power supply station 1 does not operate, the incoming lines 1 and 2 of the series power supply station 1 will trip after a self-healing trip delay, and a tripping action command for incoming line 1 of the series power supply station 2 will be sent to the series power supply station 2. If both incoming lines 1 and 2 of the series power supply station 1 are open, a self-healing start command will be issued. The self-healing device of the series power supply station 2 will receive the self-healing start command after the self-healing charging is completed, and there is no voltage on the power supply 1 side and voltage on the power supply 2 side. Then, after a delay, the incoming line 2 switch of the series power supply station 2 will be closed.

[0049] For faults in other lines outside incoming lines 1 and 2 of series power supply station 2 or other lines outside incoming lines 1 and 2 of series power supply station 3: the protection of other lines will trip the corresponding switches of other lines. If the corresponding switches of other lines trip, no self-healing action is required; if the corresponding switches of other lines fail to trip, self-healing discharge will occur.

[0050] Preferably, the fault analysis and self-healing gate based on the information exchanged between the respective healing devices and the self-healing action logic of the chain-connected main wiring area includes:

[0051] Line fault between Series Supply Station 1 and Series Supply Station 2: The line optical differential protection of the line between Series Supply Station 1 and Series Supply Station 2 trips the incoming line 2 switch of Series Supply Station 1 and the incoming line 1 switch of Series Supply Station 2. If the self-healing device of Series Supply Station 2 receives the protection action signal of the incoming line 1 switch of Series Supply Station 2 and there is no voltage on bus 1 and no current in the incoming line 1 switch of Series Supply Station 2, then the incoming line 1 switch of Series Supply Station 2 will trip after a self-healing trip delay. If the incoming line 1 switch of Series Supply Station 2 opens and there is no voltage on bus 1 of Series Supply Station 2 and voltage on the incoming line of Series Supply Station 2, then the incoming line 2 switch of Series Supply Station 2 will close after a delay. If the incoming line 1 switch of Series Supply Station 2 opens... If the circuit breaker fails to trip, it will self-heal and discharge. If the self-healing device of the series power supply station 2 does not receive the protection action signal of the incoming line 1 switch of the series power supply station 2, and the incoming line 2 switch of the series power supply station 1 and the incoming line 1 switch of the series power supply station 2 have previously met the current direction inconsistency criterion, then after the incoming line 1 switch of the series power supply station 2 has no current and the bus 1 of the series power supply station 2 has no voltage, the incoming line 1 switch of the series power supply station 2 will trip after a self-healing trip delay. If the incoming line 1 switch of the series power supply station 2 trips and the bus 1 of the series power supply station 2 has no voltage and the incoming line of the incoming line 2 of the series power supply station 2 has voltage, then the incoming line 2 switch of the series power supply station 2 will close after a delay. If the incoming line 1 switch of the series power supply station 2 fails to trip, it will self-heal and discharge.

[0052] Line fault between series power supply station 2 and series power supply station 3: The line protection of series power supply station 3 trips the incoming line 1 switch of series power supply station 3. If the incoming line 1 switch of series power supply station 3 trips, it will be locked and self-healed; if the incoming line 1 switch of series power supply station 3 fails to operate, it will self-heal and discharge.

[0053] Preferably, the fault analysis and self-healing gate based on the information exchanged between the respective healing devices and the self-healing action logic of the chain-connected main wiring area includes:

[0054] Fault in the line between the series power supply station 3 and the power source 2: The line optical differential protection of the line between the series power supply station 3 and the power source 2 trips the incoming line 2 switch of the series power supply station 3 and the outgoing line switch of the power source 2. If the self-healing device of the series power supply station 3 receives the protection action signal of the incoming line 2 switch of the series power supply station 3 and the bus 1 of the series power supply station 3 is de-energized and the incoming line 2 switch of the series power supply station 3 has no current, then the incoming line 2 switch of the series power supply station 3 will trip after a self-healing trip delay. If the incoming line 2 switch of the series power supply station 3 trips, a self-healing start command is issued. The self-healing device of the series power supply station 2 receives the self-healing start command after the self-healing charging is completed and the bus 1 of the series power supply station 2 is energized and the incoming line of the incoming line 2 of the series power supply station 2 is de-energized. After a delay, the incoming line 1 switch of the series power supply station 2 will close. If the incoming line 2 switch of the series power supply station 3 fails to trip, then the self-healing discharge will occur.

[0055] If the self-healing device of the series power supply station 3 does not receive the protection action signal of the incoming line 2 of the series power supply station 3, and based on the fact that the current direction inconsistency criterion was previously met by the incoming line 2 switch of the series power supply station 3 and the outgoing line switch of the power supply 2, the incoming line 1 switch of the series power supply station 3 will trip after a self-healing trip delay when there is no current in the incoming line 2 switch of the series power supply station 3 and no voltage on the bus. If the incoming line 1 switch of the series power supply station 3 trips, a self-healing start command will be issued. If the self-healing device of the series power supply station 2 receives the self-healing start command after the self-healing charging is completed and the bus 1 of the series power supply station 2 is energized and the incoming line 2 of the series power supply station 2 is de-energized, the incoming line 2 switch of the series power supply station 2 will close after a delay. If the incoming line 1 switch of the series power supply station 3 fails to trip, the self-healing discharge will occur.

[0056] Preferably, the fault analysis and self-healing gate based on the information exchanged between the respective healing devices and the self-healing action logic of the chain-connected main wiring area includes:

[0057] If the circuit breaker of series power supply station 1 or series power supply station 3 trips unexpectedly, it is judged as a circuit breaker tripping unexpectedly when the circuit breaker is in the open position with no current but no manual trip signal is received and no protection action is taken. Depending on the situation, it is determined whether to lock out self-healing or start self-healing: If the incoming line 1 or incoming line 2 circuit breaker of series power supply station 1 trips unexpectedly, and bus 1 is de-energized, a self-healing start command is issued after a self-healing trip delay. The self-healing device of series power supply station 2 receives the self-healing start command after the self-healing charging is completed, and bus 1 is de-energized while incoming line 2 of series power supply station 2 is energized. After a delay, the incoming line 2 circuit breaker of series power supply station 2 is closed. If the incoming line 1 circuit breaker of series power supply station 3 trips unexpectedly, self-healing discharge is performed.

[0058] Preferably, the local incoming line backup automatic transfer logic includes:

[0059] (1) Conditions for automatic power supply of incoming lines:

[0060] Automatic transfer switch mode for incoming line 1: a) Circuit breaker refuses to trip; b) Automatic transfer switch is received; c) Circuit breaker for incoming line 2 is manually or remotely tripped; d) Incoming line 1 is under maintenance, or incoming line 2 is under maintenance, or busbar 1 is under maintenance; e) TWJ of incoming line 1 is abnormal, or TWJ of incoming line 2 is abnormal; f) Circuit breaker for incoming line 1 is closed; g) When power is supplied to incoming line 1, the voltage of incoming line 1 does not meet the requirement of being energized for more than 15 seconds; h) Any one of the automatic transfer switch setting control word, function hard switch, or function soft switch is deactivated.

[0061] If any of the above conditions are met, the incoming line will automatically supply power.

[0062] Incoming Line 2 Backup Automatic Transfer Method:

[0063] a) Circuit breaker refuses to trip; b) Receives lockout for automatic transfer switch; c) Manually or remotely trips incoming line 1 circuit breaker; d) Incoming line 1 is under maintenance, or incoming line 2 is under maintenance, or busbar 1 is under maintenance; e) Incoming line 1 TWJ is abnormal, or incoming line 2 TWJ is abnormal; f) Incoming line 2 circuit breaker is closed; g) When checking the power supply to incoming line 2, the voltage of incoming line 2 does not meet the requirement of being energized for more than 15 seconds; h) Any one of the incoming line automatic transfer setting control word, or function hard switch, or function soft switch is deactivated;

[0064] If any of the above conditions are met, the incoming line will automatically supply power.

[0065] (2) Conditions for automatic transfer charging of incoming lines:

[0066] Incoming line 1 backup automatic transfer mode:

[0067] a) Busbar 1 has three-phase voltage; b) Incoming line 1 circuit breaker is open; c) Incoming line 2 circuit breaker is closed; d) When the closing position control word is activated, the incoming line 1 circuit breaker is closed; e) When the power supply 1 is activated, the incoming line 1 voltage meets the requirements for voltage; f) The conditions for automatic power supply of the incoming line are not met.

[0068] If all the above conditions are met, the incoming line will automatically switch on and charge after a set delay.

[0069] Incoming Line 2 Backup Automatic Transfer Method:

[0070] a) Busbar 1 is energized in all three phases; b) Incoming line 2 circuit breaker is open; c) Incoming line 1 circuit breaker is closed; d) When the closing position control word is activated, the incoming line 2 circuit breaker is closed; e) When the power supply 2 is activated, the voltage of incoming line 2 meets the requirements for being energized; f) The conditions for automatic power supply of the incoming line are not met.

[0071] If all the above conditions are met, the incoming line will automatically switch on and charge after a set delay.

[0072] (3) Logic of automatic transfer switch operation for incoming lines:

[0073] Incoming line 1 backup automatic transfer mode:

[0074] After the automatic transfer charging of incoming line 1 is completed, the voltage of bus 1 is lower than the bus no-voltage setting value, and the current of incoming line 2 is less than the current-free setting value of incoming line 2. When the "Check incoming line 1 voltage" control word is put into operation, the voltage of incoming line 1 is greater than the power supply voltage setting value. When the "Chain 1 series power supply self-healing priority" control word is put into operation and the chain series power supply main connection 1 self-healing discharges, or when the "Chain 1 series power supply self-healing priority" control word is put out, after the delay of the automatic transfer tripping time of incoming line 1, the device reports "trip incoming line 2 circuit breaker", and the output trips the incoming line 2 circuit breaker. If the incoming line 2 circuit breaker still does not trip after the delay, the automatic transfer is energized and reports "Automatic transfer tripping unsuccessful".

[0075] If it is confirmed that the incoming line 2 circuit breaker has tripped, the "trip incoming line 2 circuit breaker" command is revoked. After the automatic transfer closing time of incoming line 1, the command "close incoming line 1 circuit breaker" is reported and the incoming line 1 circuit breaker is closed. If the incoming line 1 circuit breaker still fails to close after the delay, the backup automatic transfer is energized and the command "backup automatic transfer closing unsuccessful" is reported. If it is confirmed that the incoming line 1 circuit breaker is closed, the command "backup automatic transfer operation closed successfully" is reported.

[0076] Incoming Line 2 Backup Automatic Transfer Method:

[0077] After the automatic transfer charging of incoming line 2 is completed, the voltage of bus 1 is lower than the bus no-voltage setting value, and the current of incoming line 1 is less than the current-free setting value of incoming line 1. When the "Check incoming line 2 voltage" control word is put on, the voltage of incoming line 2 is greater than the power supply voltage setting value. When the "Chain 1 series power supply self-healing priority" control word is put on and the chain series power supply main connection 2 self-healing discharges, or when the "Chain 1 series power supply self-healing priority" control word is put off, after the automatic transfer trip time delay of incoming line 2, the device reports "trip incoming line 1 circuit breaker", and the output trips the incoming line 1 circuit breaker. If the incoming line 1 circuit breaker still does not trip after the delay, the automatic transfer is energized and reports "Automatic transfer trip failed".

[0078] If it is confirmed that the incoming line 1 circuit breaker has tripped, the "trip incoming line 1 circuit breaker" command is revoked. After the automatic transfer closing time of incoming line 2, the command "close incoming line 2 circuit breaker" is reported and the incoming line 2 circuit breaker is closed. If the incoming line 2 circuit breaker still fails to close after the delay, the backup automatic transfer is energized and the command "backup automatic transfer closing unsuccessful" is reported. If it is confirmed that the incoming line 2 circuit breaker is closed, the command "backup automatic transfer operation closed successfully" is reported.

[0079] Preferably, the local segmented backup automatic switching logic in step 3 includes:

[0080] (1) On-site segmented backup charging conditions:

[0081] a) Busbar 1 has three-phase voltage; b) Busbar 2 has three-phase voltage; c) One of the incoming line 1 and incoming line 2 switches is not under maintenance and is in the closed position; c) One of the incoming line 3 and incoming line 4 switches is not under maintenance and is in the closed position; d) The sectionalizing switch is in the open position.

[0082] If all the above conditions are met, the on-site segmented automatic charging will be completed after a set delay.

[0083] (2) Local segmented backup power supply conditions:

[0084] a) If busbar X does not meet the voltage condition, after delayed discharge, when the automatic switching of section 1 is completed, X takes the value of 2; when the automatic switching of section 2 is completed, X takes the value of 1.

[0085] b) Sectional switch closed; c) Sectional automatic transfer closed; d) Sectional switch under maintenance; e) Both incoming lines 1 and 2 under maintenance; f) Both incoming lines 3 and 4 under maintenance; g) Any TWJ abnormality in incoming lines 1-4 or any section; h) Any switch on incoming lines 1 and 2 refusing to trip; i) Sectional switch refusing to close; j) Substation side sends blocking self-healing signal; k) Any of the sectional automatic transfer setting control word, function hard switch, or function soft switch is deactivated;

[0086] If any of the above conditions are met, on-site segmented backup power supply will be implemented.

[0087] (3) Local segmented automatic switching action logic:

[0088] When charging is complete, busbar 1 is de-energized and incoming lines 1 and 2 have no current, while busbar 2 is energized. Then, the sectional automatic transfer switch logic is activated. When the "Chain 1 Series Power Self-Healing Priority" control word is engaged, and the Chain 1 Series Power Main Wiring Line 1 self-heals and discharges, and the Chain 1 Series Power Main Wiring Line 1 incoming line is energized, or when the "Chain 1 Series Power Self-Healing Priority" control word is disengaged and the Chain 1 Series Power Main Wiring Line 1 incoming line is energized, after the sectional automatic transfer switch 1 tripping time delay, incoming line 1 and incoming line 2 switches are tripped. After confirming that the incoming line 1 and incoming line 2 switches have tripped and the busbar is de-energized, after the sectional automatic transfer switch closing time delay, the sectional switches are closed.

[0089] When charging is complete, busbar 2 is de-energized and incoming lines 3 and 4 have no current, while busbar 1 is energized. In this case, the sectional automatic transfer switch logic is activated. When the "Chain 1 Series Power Supply Self-Healing Priority" control word is engaged and the Chain 1 Series Power Supply Main Wiring 1 self-healing discharges and the Chain 1 Series Power Supply Main Wiring 1 incoming line is energized, or when the "Chain 1 Series Power Supply Self-Healing Priority" control word is disengaged and the Chain 1 Series Power Supply Main Wiring 1 incoming line is energized, after the sectional automatic transfer switch 2 tripping time delay, the incoming line 3 and 4 switches are tripped. After confirming that the incoming line 3 and 4 line switches have tripped and the busbar is de-energized, the sectional switches are closed after the sectional automatic transfer switch closing time delay.

[0090] A third aspect of the present invention provides a terminal, including a processor and a storage medium; the storage medium is used to store instructions; the processor is used to perform operations according to the instructions to execute the steps of the method.

[0091] A fourth aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method.

[0092] Compared with the prior art, the beneficial effects of this application include at least the following:

[0093] 1. This application system integrates a dual-chain self-healing mechanism. During normal operation, it automatically identifies the open-loop switch in the main wiring circuit of the chain-type power supply system. Using the open-loop switch as the basic point, it sets the self-healing system action logic corresponding to different faults occurring under various operating modes. When a fault occurs in the chain-type power supply network, the self-healing devices coordinate to perform comprehensive logic judgment, determine the fault location, and after the line protection device cuts off the fault, execute the fault isolation scheme. After confirming that the fault isolation is complete, it quickly closes the circuit breaker at the open loop point to restore power supply to the non-faulty loads. If the self-healing switch fails or self-healing is due to abnormal fiber optic discharge, the local incoming line backup automatic transfer switch is prioritized to close the circuit breaker at the open loop point again. If the incoming line closing fails, the local sectional backup automatic transfer switch trips the incoming line switch and finally closes the sectional switch. This effectively solves the problem of power restoration after a power outage in a two-line, three-station dual-chain power supply system and the problem of backup automatic transfer switch failure during fiber optic abnormalities.

[0094] 2. In this application, each chain-supply station is equipped with only one self-healing device to complete the regional self-healing of the two chain-supply systems, the automatic switching of the incoming line of each chain-supply station, and the segmented automatic switching, which reduces the number of devices and lowers the cost compared to the existing technology that requires five devices.

[0095] 3. The self-healing devices of each series power supply station in this application have the same program and adopt a masterless networking mode. They share information across the entire network through data interaction, eliminating the need for a central node, which improves system flexibility and fault tolerance, avoids single points of failure, and simplifies equipment management by adopting a masterless networking mode and data sharing technology, thereby reducing management costs.

[0096] 4. The local incoming line backup automatic transfer logic of this application can automatically perform local incoming line backup automatic transfer after the fiber optic communication network is interrupted due to external reasons in the chain-type series power supply mode, and can still ensure the restoration of power supply after the fault occurs, thereby improving the reliability and continuity of power supply.

[0097] 5. The local segmented automatic transfer logic of this application can be used to close the segmented switches of series power supply station 1 to 3 after the power supply on both sides of chain 1 or 2 is lost, so that the self-healing and incoming line automatic transfer of chain 1 and 2 will lose their function. At this time, the power supply of chain 1 or 2 can be reliably ensured by the local segmented automatic transfer operation.

[0098] 6. Current fiber optic communication equipment requires setting local identification codes, and for series power supply stations, identification codes for both the left and right sides need to be set. The process is cumbersome and prone to errors. This application uses a pairing method for inter-station communication, which reduces the difficulty of setting communication between field devices. The substation of the side station puts in the "Is the substation a side station?" control word, and the number is set to 1. The adjacent device is set to 2, and so on. The device matches with the adjacent device to check whether the local and adjacent numbers are consecutive, which can verify whether the configuration is correct. By setting the control word and number, the configuration of inter-station communication is simplified and the configuration difficulty is reduced. Attached Figure Description

[0099] Figure 1 This application provides a schematic diagram of the main wiring diagram for a self-healing control method applicable to a two-line, three-station, dual-chain region.

[0100] Figure 2 This application provides a charging logic for an open-loop device of a self-healing intermediate station in a two-line, three-station, dual-chain region.

[0101] Figure 3 This application provides a charging logic for an open-loop device for a self-healing side station in a two-line, three-station, dual-chain region.

[0102] Figure 4 This application provides a charging logic for a self-healing non-open-loop point device suitable for a two-line, three-station, dual-chain region.

[0103] Figure 5 This application provides a discharge logic for a self-healing device suitable for a two-line, three-station, dual-chain region.

[0104] Figure 6 A schematic diagram of the main wiring fault point of a self-healing control method for a two-line, three-station, dual-chain area provided in this application embodiment;

[0105] Figure 7 This application provides an embodiment of a self-healing device for a two-line, three-station, dual-chain area with an incoming line backup automatic discharge logic 1.

[0106] Figure 8 This application provides an embodiment of a self-healing device for a two-line, three-station, dual-chain area with an incoming line backup charging logic 1.

[0107] Figure 9 This application provides an embodiment of an automatic switching logic for an inlet device in a two-line, three-station, dual-chain area.

[0108] Figure 10 This application provides an embodiment of a self-healing device for a two-line, three-station, dual-chain area, busbar section 1 with automatic power-on logic.

[0109] Figure 11 This application provides an embodiment of a self-healing device for a two-line, three-station, dual-chain area, busbar 1 section with automatic switching charging logic.

[0110] Figure 12 This application provides an embodiment of a self-healing device busbar 1 section backup automatic switching operation logic applicable to a two-line, three-station, dual-chain area. Detailed Implementation

[0111] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of the embodiments. The embodiments described in this application are merely some embodiments of this application, and not all embodiments. Based on the spirit of this application, other embodiments obtained by those skilled in the art without creative effort are all within the protection scope of this application.

[0112] Embodiment 1 of this application provides a self-healing control system suitable for a two-line, three-station, dual-chain region, such as... Figure 1 As shown: It can connect to 4 incoming line bays and one segment bay, and supports the self-healing function of two independent chain-type series power supply main wiring. Specifically, the control system includes series power supply station 1, series power supply station 2 and series power supply station 3;

[0113] Each series power supply station is equipped with its own self-healing device, which is used to collect analog and digital quantity information of the station and interact with the self-healing devices of other series power supply stations, as well as to execute the self-healing action logic of the chain-type series power supply main wiring, the local incoming line backup automatic transfer logic, and the local segment backup automatic transfer logic.

[0114] Each serial power supply station is connected to incoming line 1 and incoming line 2 connected to bus 1, incoming line 3 and incoming line 4 connected to bus 2, and the segmented bays connected between bus 1 and bus 2. Incoming line 1 and incoming line 2 are backups for each other, and incoming line 3 and incoming line 4 are backups for each other. The bays of incoming line 1 and incoming line 3 are bound to the bay of serial power supply station channel 1, and the bays of incoming line 2 and incoming line 4 are bound to the bay of serial power supply station channel 2.

[0115] The incoming lines 1, 2 and bus 1 of each series power supply station form a chain-type series power supply main connection 1, and the incoming lines 3, 4 and bus 2 of each series power supply station form a chain-type series power supply main connection 2.

[0116] More preferably, the intervals controlled by the self-healing logic of the chain-type series power supply main wiring 1 are: incoming line 1 interval, incoming line 2 interval, and segmented switch interval; incoming line 1 interval is bound to channel 1, and incoming line 2 is bound to channel 2 interval. The intervals controlled by the self-healing logic of the chain-type series power supply main wiring 2 are: incoming line 3 interval, incoming line 4 interval, and segmented switch interval; incoming line 3 is bound to channel 1 interval, and incoming line 4 is bound to channel 2 interval.

[0117] The system can determine whether a substation is a side station by setting the [Whether the substation is a side station] parameter. A side station refers to a substation where only one side of the power supply channel is in use. The series power supply station adjacent to the power supply station is a side station and should be set to 1, while other series power supply stations should be set to 0.

[0118] The system can determine the chain link sequence by setting the [Substation Number] parameter, with a value ranging from 0 to 10. The [Substation Number] of the chain-connected power supply stations must be set according to the following rules: the [Substation Number] of a station with only one side is set to 1, referred to as the starting power supply station. Starting from the starting power supply station, the [Substation Number] of each subsequent power supply station increments by 1. Furthermore, channel 2 of the starting power supply station is used to connect to channel 1 of the next adjacent power supply station.

[0119] For chain-type series power supply stations, the power station does not need to be equipped with a self-healing device; only the series power supply station itself needs to be equipped with one. The connection method for adjacent series power supply stations, taking a two-line, three-station double-chain series power supply main wiring as an example, is as follows: Figure 1 As shown, passage 1 of station B is connected to passage 2 of station A, and passage 2 of station B is connected to passage 1 of station C.

[0120] The system consists of three self-healing devices in series power supply stations, meaning that each device has the same program and can be installed flexibly.

[0121] The self-healing device acquires bus voltage, line voltage, and current through an analog acquisition module, and acquires the positions of four lines and one sectional circuit breaker. It then transmits the analog and digital information to adjacent devices via optical fiber. Simultaneously, it receives analog and digital information from adjacent devices. Each device can obtain all analog and digital information of the entire chain structure through data interaction, achieving resource sharing.

[0122] Embodiment 2 of this application provides a self-healing control method applicable to a two-line, three-station, dual-chain region, including:

[0123] Step 1: Each self-healing device collects analog and digital signals from the corresponding series power supply station and performs information exchange. When the main wiring 1 and 2 of the chain-type series power supply are running normally, it identifies the open loop point in the corresponding main wiring and configures the self-healing action logic of the main wiring of the chain-type series power supply according to the position of the open loop point.

[0124] More preferably, in the two independent chain-type series power supply main wiring diagrams, only one of the six circuit breaker switches is in the open position, referred to as the open-loop point, while the other five switches are in the closed position. Each series power supply station's section switch is in the open position, and the four incoming line switches can be in either the open or closed position depending on the chain-type series power supply method. Therefore, by analyzing the switch position status of the six incoming line intervals in each chain-type series power supply main wiring diagram, the incoming line intervals where the switch position is in the open position are identified as the open-loop point in the corresponding main wiring diagram.

[0125] The charging logic of the chain-type series power supply self-healing device varies depending on the location of the open-loop point. The self-healing action logic of the main wiring of the chain-type series power supply is configured according to the location of the open-loop point, including:

[0126] (1)(1) Set the corresponding open-loop point device charging logic according to the open-loop point position, as follows:

[0127] (1.1) If the open loop point is located at an intermediate station, set up as follows: Figure 2 The charging logic of the intermediate station open-loop point device is shown below:

[0128] a) Self-healing function is activated;

[0129] b) The device setting for the [Whether the substation is a side station] parameter is off, indicating that the device is currently used in an intermediate station, not a side station; the parameter setting is 0 to indicate off, and 1 to indicate on.

[0130] c) The self-healing discharge conditions are not met;

[0131] d) The busbar of this device is pressurized;

[0132] e) Both adjacent sides receive a busbar pressure warning;

[0133] f) Both adjacent sides receive information streams without open loops.

[0134] If all the above conditions are met, charging will be completed after [10s], and a self-healing charging completion information stream will be sent to both sides.

[0135] (1.2) If the open loop point is located at the side station, set as follows: Figure 3 The charging logic of the open-loop point device at the shown side station is as follows:

[0136] a) Self-healing function is activated;

[0137] b) The [Whether the substation is a side station] parameter set in the device settings is enabled, indicating that this device is currently used as a side station.

[0138] c) The self-healing discharge conditions are not met;

[0139] d) The busbar of this device is pressurized;

[0140] e) Receives a voltage indicator on the busbar connected to the channel and the voltage is drawn from the line connected to the power station;

[0141] f) Received information flow from the channel-connected side without an open loop.

[0142] If the above conditions are met simultaneously, charging is completed after [10s], and a self-healing charging completion information stream is sent to the adjacent side.

[0143] (2) Setting as follows Figure 4 The charging logic for the non-open-loop device shown is as follows:

[0144] a) Self-healing function is activated;

[0145] b) The self-healing discharge conditions are not met;

[0146] c) The busbar of this device is pressurized;

[0147] d) Receive the self-healing charging completion information stream from the device connected to the channel.

[0148] If the above conditions are met simultaneously, the self-healing charging will be completed after a set delay, and a self-healing charging completion information stream will be sent to the adjacent device.

[0149] (3) Setting as follows Figure 5 The chain-type self-healing discharge logic shown is as follows:

[0150] a) Manual or remote jump on any main line;

[0151] b) Self-healing has not been activated and there has been no voltage on either side for an extended period; (the voltage drawn from the line on the side connected to the power station has been without voltage for an extended period).

[0152] c) Self-healing function deactivated;

[0153] d) Open-loop point near-end fault;

[0154] e) Any main line abnormality (bus PT disconnection, main line maintenance, TWJ abnormality, CT disconnection, or communication failure).

[0155] f) Whether the self-healing gate succeeds or fails;

[0156] g) Open loop point closure or flow;

[0157] h) Receives lockout self-healing unlock input;

[0158] Discharge occurs if any of the above conditions are met.

[0159] Step 2: When any chain-type main wiring fails, fault analysis and self-healing gate are performed based on the information exchanged between the respective healing devices and the self-healing action logic of the chain-type main wiring area.

[0160] More preferably, the chain-type self-healing process: such as Figure 6 As shown, the self-healing logic takes the incoming line 2 switch of the series power supply station 2, which is a single-ring network formed by power supplies S1 and S4, as an example of open-loop hot standby. The self-healing logic for open-loop hot standby of other switches is similar and will not be described in detail. The faults of the two-line three-station system are shown in Table 1.

[0161] Table 1. Fault Diagram of Two Lines and Three Stations

[0162]

[0163] 1) Power supply bus fault on side 1

[0164] If the self-healing device of the series power supply station 1 determines that the incoming line 1 switch (102 switch) has no current and the bus 1 has no voltage and the incoming line 1 switch line draw voltage has no voltage, then the incoming line 1 switch will trip after the self-healing trip delay.

[0165] If the incoming line 1 switch of series power supply station 1 trips, a self-healing start command is issued. When the self-healing device of series power supply station 2 receives the self-healing start command after the self-healing charging is completed and there is no voltage on the power supply 1 (S1) side (main supply side) and there is voltage on the power supply 2 (S2) side (backup supply side), the incoming line 2 switch (105 switch) of series power supply station 2 is closed after a delay.

[0166] If the incoming line 1 switch of the series power supply station 1 fails to trip, then after a failure delay, the incoming line 1, incoming line 2, and bus tie switches (102, 103, 501 switches) of the series power supply station 1 will trip, and a command to trip the incoming line 1 switch of the series power supply station 2 will be sent to the series power supply station 2. When the self-healing device of the series power supply station 2 receives the command after the self-healing charging is completed, it will immediately trip the incoming line 1 switch (104 switch) of the series power supply station 2. If the incoming line 1 switch of the series power supply station 2 trips, then after a delay, the incoming line 2 switch of the series power supply station 2 will be closed. If the incoming line 1 switch of the series power supply station 2 fails to trip, then the self-healing discharge will occur, indicating that the self-healing circuit breaker has failed.

[0167] 2) Line fault between power supply 1 and series power supply station 1 (F2 fault)

[0168] a) The line protection device is operating normally:

[0169] If the line optical differential protection of the series power supply station 1 trips the outgoing line 1 switch (101 switch) of power supply 1 and the incoming line 1 (102 switch) of the series power supply station 1, the self-healing device of the series power supply station 1 receives the protection action signal of the incoming line 1 switch (102 switch), and the bus 1 is de-energized and the incoming line 1 switch (102 switch) of the series power supply station 1 is de-energized, then the incoming line 1 switch (102 switch) of the series power supply station 1 will trip after the self-healing trip delay.

[0170] If the incoming line 1 (102 switch) of the series power supply station 1 trips, a self-healing start command is issued. When the self-healing device of the series power supply station 2 receives the self-healing start command from the series power supply station 1 after the self-healing charging is completed and the power supply 1 is de-energized and the power supply 2 is energized, the incoming line 2 switch (105 switch) of the series power supply station 2 is closed after a delay.

[0171] If the incoming line 1 switch (102 switch) of the series power supply station 1 fails to trip, after a failure delay, the incoming line 1, incoming line 2, and bus tie switches (102, 103, 501 switches) of the series power supply station 1 will send a command to the series power supply station 2 to trip the incoming line 1 switch (104 switch). When the self-healing device of the series power supply station 2 receives the command to trip the incoming line 1 switch (104 switch) after the self-healing charging is completed, it will immediately trip the incoming line 1 switch (104 switch) of the series power supply station 2. If the incoming line 1 switch (104 switch) of the series power supply station 2 trips, the incoming line 2 switch (105 switch) of the series power supply station 2 will close after a delay. If the incoming line 1 switch (104 switch) of the series power supply station 2 fails to trip, the self-healing discharge will occur.

[0172] b) Line protection device fails to operate:

[0173] If the self-healing device of the series power supply station 1 does not receive the protection action signal of the incoming line 1 switch (102 switch), the action behavior is consistent with the F1 fault, that is, the self-healing device of the series power supply station 1 determines that the incoming line 1 switch (102 switch) has no current and the bus 1 has no voltage and the voltage drawn from the line of the incoming line 1 switch (102 switch) is no voltage, then the incoming line 1 switch (102 switch) will trip after the self-healing trip delay.

[0174] If the incoming line 1 switch (102 switch) of the series power supply station 1 trips, a self-healing start command is issued. When the self-healing device of the series power supply station 2 receives the self-healing start command after the self-healing charging is completed and there is no voltage on the power supply 1 side and voltage on the power supply 2 side, the incoming line 2 switch (105 switch) of the series power supply station 2 is closed after a delay.

[0175] If the incoming line 1 switch (102 switch) of the series power supply station 1 fails to trip, then after a failure delay, the incoming line 1, incoming line 2, and bus tie switches (102, 103, 501 switches) of the series power supply station 1 will trip, and a command to trip the incoming line 1 switch (104 switch) of the series power supply station 2 will be sent. When the self-healing device of the series power supply station 2 receives the command to trip the incoming line 1 switch (104 switch) after the self-healing charging is completed, it will immediately trip the incoming line 1 switch (104 switch) of the series power supply station 2. If the incoming line 1 switch (104 switch) of the series power supply station 2 trips, then after a delay, the incoming line 2 switch (105 switch) of the series power supply station 2 will close. If the incoming line 1 switch (104 switch) of the series power supply station 2 fails to trip, then the self-healing discharge will occur, indicating that the self-healing circuit breaker has failed.

[0176] 3) Fault on busbar 1 of the series power supply station (F3 fault)

[0177] When the bus differential protection configured on the bus of series power supply station 1 operates and is connected to the self-healing input, the self-healing device of series power supply station 1 receives the bus differential protection operation and then self-healing discharges.

[0178] Fault on busbar 1 of series power supply station 2 (F6 fault)

[0179] When the bus differential protection configured on the bus of the series power supply station 2 is activated and the self-healing device of the series power supply station 2 receives the bus differential protection activation, it will self-heal and discharge.

[0180] Fault on busbar 1 of series power supply station (F9 fault)

[0181] When the bus differential protection configured on bus 3 of the series power supply station operates and is connected to the self-healing input, the self-healing device of the series power supply station 3 receives the bus differential protection operation and then self-healing discharges.

[0182] 4) Faults on other lines besides incoming lines 1 and 2 of the series power supply station (F4 fault)

[0183] If the protection device of other lines trips the corresponding switch (106 switch), then no self-healing action is required; if the corresponding switch of other lines fails to trip, then the backup protection device of the power supply 1 output line protection device will trip the power supply 1 output line switch (101 switch).

[0184] If both incoming line 1 and incoming line 2 switches (102 and 103) of the series power supply station 1 are without current and the differential protection of the bus of the series power supply station 1 does not operate, the incoming line 1 and incoming line 2 switches (102 and 103) of the series power supply station 1 will trip after a self-healing trip delay, and a tripping command will be sent to the series power supply station 2 to trip the incoming line 1 (104 switch); if both incoming line 1 and incoming line 2 switches (102 and 103) of the series power supply station 1 are open, a self-healing start command will be issued. When the self-healing device of the series power supply station 2 receives the self-healing start command after the self-healing charging is completed and there is no voltage on the power supply 1 side and voltage on the power supply 2 side, the incoming line 2 switch (105 switch) of the series power supply station 2 will close after a delay.

[0185] 5) Line fault between series power supply station 1 and series power supply station 2 (F5 fault)

[0186] If the line optical differential protection of the line between the series power supply station 1 and the series power supply station 2 trips the incoming line 2 switch of series power supply station 1 and the incoming line 1 switch (103, 104 switches) of series power supply station 2, and the self-healing device of series power supply station 2 receives the protection action signal of the incoming line 1 switch (104 switch) of series power supply station 2 and the bus 1 is de-energized and the incoming line 1 switch of series power supply station 2 has no current, then the incoming line 1 switch of series power supply station 2 will trip after a self-healing trip delay; if the incoming line 1 switch (104 switch) of series power supply station 2 trips and the bus 1 of series power supply station 2 is de-energized and the incoming line of the incoming line 2 (105 switch) of series power supply station 2 has voltage, then the incoming line 2 switch (105 switch) of series power supply station 2 will close after a delay; if the incoming line 1 switch (104 switch) of series power supply station 2 fails to trip, then the self-healing discharge will occur.

[0187] If the self-healing device of the series power supply station 2 does not receive the protection action signal from the incoming line 1 switch (104 switch) of the series power supply station 2, and the incoming line 2 switch of the series power supply station 1 and the incoming line 1 switch (103, 104 switches) of the series power supply station 2 have previously met the current direction inconsistency criterion, then after the incoming line 1 switch (104 switch) of the series power supply station 2 has no current and the bus 1 of the series power supply station 2 has no voltage, the incoming line 1 switch (104 switch) of the series power supply station 2 will trip after a self-healing trip delay; if the incoming line 1 switch (104 switch) of the series power supply station 2 trips and the bus 1 of the series power supply station 2 has no voltage and the incoming line of the incoming line 2 (105 switch) of the series power supply station 2 has voltage, then the incoming line 2 switch (105 switch) of the series power supply station 2 will close after a delay; if the incoming line 1 switch (104 switch) of the series power supply station 2 fails to trip, then the self-healing discharge will occur.

[0188] 6) Faults in incoming line 1 and other lines outside of the series power supply station 2 (F7 fault)

[0189] If the protection of other lines in the series power supply station 2 trips the corresponding switch (107 switch), and the corresponding switch of other lines trips, then no self-healing action is required; if the corresponding switch of other lines fails to trip, then self-healing discharge will occur.

[0190] Fault in other lines besides incoming lines 1 and 2 of the series power supply station (F10 fault).

[0191] If the protection of other lines in the series power supply station 3 trips the corresponding switch (407 switch) of other lines, then no self-healing action is required; if the corresponding switch of other lines fails to trip, then self-healing discharge will occur.

[0192] 7) Line fault between series power supply station 2 and series power supply station 3 (F8 fault)

[0193] If the line protection of the series power supply station 3 trips the incoming line 1 switch (405 switch) of the series power supply station 3, and the incoming line 1 switch (405 switch) of the series power supply station 3 opens, then the self-healing is locked; if the incoming line 1 switch (405 switch) of the series power supply station 3 fails to operate, then the self-healing discharge is performed.

[0194] 8) Line fault between series power supply station 3 and power supply 2 (F11 fault)

[0195] When the line optical differential protection of the line between the series power supply station 3 and the power supply 2 trips the incoming line 2 of the series power supply station 3 and the outgoing line switch (404 switch, 401 switch) of the power supply 2, if the self-healing device of the series power supply station 3 receives the protection action signal of the incoming line 2 switch (404 switch) of the series power supply station 3 and the bus 1 of the series power supply station 3 is de-energized and the incoming line 2 switch (404 switch) of the series power supply station 3 is de-energized, then the incoming line 2 switch (404 switch) of the series power supply station 3 will trip after a self-healing trip delay; if the incoming line 2 switch (404 switch) of the series power supply station 3 trips, then a self-healing start command is issued. When the self-healing charging of the series power supply station 2 is completed, and the bus 1 of the series power supply station 2 is energized and the incoming line of the incoming line 2 of the series power supply station 2 is de-energized, the incoming line 1 switch (105 switch) of the series power supply station 2 will close after a delay; if the incoming line 2 switch (404 switch) of the series power supply station 3 fails to trip, then self-healing discharge will occur.

[0196] If the self-healing device of the series power supply station 3 does not receive the protection action signal from the incoming line 2 (404 switch) of the series power supply station 3, based on the fact that the incoming line 2 switch of the series power supply station 3 and the outgoing line switch (404 switch, 401 switch) of the power supply 2 have previously met the current direction inconsistency criterion, then after the incoming line 2 (404 switch) of the series power supply station 3 has no current and the bus has no voltage, the incoming line 1 switch (405 switch) of the series power supply station 3 will trip after a self-healing trip delay; if the incoming line 1 switch (405 switch) of the series power supply station 3 trips, a self-healing start command will be issued. When the self-healing charging of the series power supply station 2 is completed, the self-healing start command will be received and the bus 1 of the series power supply station 2 has voltage and the incoming line of the series power supply station 2 (105 switch) has no voltage, then the incoming line 2 switch (105 switch) of the series power supply station 2 will close after a delay; if the incoming line 1 switch (405 switch) of the series power supply station 3 fails to trip, then the self-healing discharge will occur.

[0197] 9) Power supply bus 2, line 1 fault (F12 fault)

[0198] If the self-healing device of the series power supply station 3 determines that the incoming line 1 switch (405 switch) of the series power supply station 3 has no current, the bus 1 has no voltage, and the line voltage drawn from the incoming line 1 switch (405 switch) of the series power supply station 3 is not energized, then the incoming line 1 switch (405 switch) of the series power supply station 3 will trip after a self-healing trip delay; if the incoming line 1 switch (405 switch) of the series power supply station 3 trips, then a self-healing start command will be issued. If the self-healing device of the series power supply station 2 receives the self-healing start command after the self-healing charging is completed and the bus 1 of the series power supply station 2 has voltage and the incoming line 2 of the series power supply station 2 (105 switch) has no voltage, then the incoming line 2 switch (105 switch) of the series power supply station 2 will close after a delay; if the incoming line 1 switch (405 switch) of the series power supply station 3 fails to trip, then the self-healing discharge will occur.

[0199] 10) The switch of series power supply station 1 or series power supply station 3 trips unexpectedly.

[0200] Switch tripping occurs when the switch is in the open position with no current but no manual trip signal is received and no protection action is taken. Depending on the specific circumstances, it will be determined whether the tripping is due to interlocking or restarting self-healing mechanisms.

[0201] If the incoming line 1 or incoming line 2 switch (102 or 103 switch) of the series power supply station 1 trips without authorization, and the bus 1 is de-energized, a self-healing start command is issued after a self-healing trip delay. The self-healing device of the series power supply station 2 receives the self-healing start command after the self-healing charging is completed, and the bus 1 is de-energized and the incoming line 2 (105 switch) of the series power supply station 2 is energized. After a delay, the incoming line 2 switch (105 switch) of the series power supply station 2 is closed.

[0202] If the incoming line 1 switch (405 switch) of the series power supply station 3 trips unexpectedly, it will self-heal and discharge.

[0203] Step 3: If the self-healing switch fails, execute the local incoming line backup automatic transfer logic to close the incoming line. If the incoming line closing fails, execute the local section backup automatic transfer logic to trip the incoming line switch and close the section switch.

[0204] 1. Automatic transfer switch for incoming lines: Incoming lines 1 and 2 are each other's backups, i.e., 1DL and 2DL are each other's backups; incoming lines 3 and 4 are each other's backups, i.e., 3DL and 4DL are each other's backups.

[0205] (1) Incoming line 1 (2) Automatic transfer discharge conditions, such as Figure 7 As shown:

[0206] a) The circuit breaker refuses to trip;

[0207] b) Received the automatic switching input of the lockout backup;

[0208] c) Manually tripped and remotely tripped incoming line 2(1) circuit breaker;

[0209] d) Incoming line 1 or incoming line 2 or busbar 1 undergoes maintenance;

[0210] e) Incoming line 1TWJ is faulty or incoming line 2TWJ is faulty;

[0211] f) Incoming line 1(2) circuit breaker closed;

[0212] g) When the power supply to line 1(2) is turned on, the voltage of line 1(2) does not meet the requirement of being under voltage for more than 15 seconds;

[0213] h) The incoming line automatic transfer setting control word, or the function hard switch, or the function soft switch can be deactivated.

[0214] Discharge occurs if any of the above conditions are met.

[0215] (2) Incoming line 1 (2) Automatic transfer charging conditions as follows Figure 8 As shown:

[0216] a) Busbar 1 has three-phase voltage;

[0217] b) Circuit breaker of incoming line 1(2) is in the open position;

[0218] c) Incoming line 2(1) circuit breaker closed;

[0219] d) When the position control word is engaged after closing, the incoming line 1(2) circuit breaker is closed;

[0220] e) When the power supply to line 1(2) is turned on, the voltage of line 1(2) is positive;

[0221] f) Discharge conditions are not met;

[0222] If all the above conditions are met, charging will be completed after 10 seconds.

[0223] (3) The operation logic of the incoming line automatic transfer switch is as follows: Figure 9 As shown:

[0224] After the automatic transfer charging of incoming line 1 (2) is completed, the voltage of bus 1 is lower than the [bus no-voltage setting value], and the current of incoming line 2 (1) is less than the [power supply 2 (1) no-current setting value]. When the [detect incoming line 1 (2) voltage] control word is put into operation, the voltage of incoming line 1 (2) is greater than the [power supply voltage setting value]. When [chain 1 series power supply self-healing priority] is put into operation and chain 1 (2) series power supply self-healing discharge is performed, or when [chain 1 series power supply self-healing priority] is put out, after the delay of [incoming line 1 (2) automatic transfer trip time], the device reports "trip incoming line 2 (1) circuit breaker", and the output trips the incoming line 2 (1) circuit breaker. If the incoming line 2 (1) circuit breaker still does not trip after a delay of 5 seconds, the automatic transfer is put into operation and "automatic transfer trip failed".

[0225] If it is confirmed that the power supply 2(1) circuit breaker has tripped, the "trip power supply (1) 2 circuit breaker" command will be revoked. After a delay of [incoming line 1(2) automatic transfer closing time], the "close incoming line 1(2) circuit breaker" command will be reported and the power supply (2) 1 circuit breaker will be closed. If the incoming line 1(2) circuit breaker still has not closed after a delay of 5 seconds, the backup automatic transfer will be activated and the "backup automatic transfer closing failure" command will be reported.

[0226] If it is confirmed that the incoming line 1(2) circuit breaker is closed, then report "Automatic transfer switch closed successfully".

[0227] After the incoming line 1(2) is closed, the acceleration protection after the incoming line 1(2) is activated to prevent the incoming line 1(2) from closing due to a fault.

[0228] 2. The distributed distribution protection self-healing device used for this bus can be connected to the voltage of another bus section to realize the local segmented backup automatic transfer function. Before the automatic transfer segment, the incoming line 1 and incoming line 2 switches on this bus are tripped first.

[0229] When a fault causes a section of the busbar to lose power, if the [Chain-type Series Power Supply Self-Healing Priority] is activated, the open-loop switch of the single-ring series power supply will first achieve self-healing. If the series power supply self-healing fails to discharge and the incoming line of this busbar is automatically energized, the local segmented automatic transfer function will then be implemented. If the [Chain-type Series Power Supply Self-Healing Priority] is deactivated and the incoming line of this busbar is automatically energized, the local segmented automatic transfer function will then be implemented.

[0230] The tripping target of the automatic transfer switch is the circuit breaker of this bus. After any one of the main circuit breakers is under maintenance, the self-healing function is locked, but the automatic transfer switch remains engaged. When both main circuit breakers of this bus are under maintenance, the automatic transfer switch is deactivated.

[0231] The automatic switching on of the sectionalizing circuit breaker is activated to accelerate the sectionalizing circuit breaker closing and prevent closing due to a fault.

[0232] The device has a segment 1(2) with automatic switching function.

[0233] (1) The logical function is described as follows:

[0234] like Figure 10 As shown, the automatic switching charging conditions for bus 1(2) are as follows:

[0235] a) Busbar 1 has three-phase voltage;

[0236] b) Busbar 2 is under pressure in all three phases;

[0237] c) One of the incoming line 1 and incoming line 2 switches is not under maintenance and is in the closed position;

[0238] c) One of the incoming line 3 and incoming line 4 switches is not under maintenance and is in the closed position;

[0239] d) The sectionalizing switch is in the open position;

[0240] If all the above conditions are met, charging will be completed after 10 seconds.

[0241] (2) Figure 11 As shown, the automatic power supply conditions for busbar 1(2) are as follows:

[0242] a) The other busbar does not meet the voltage condition and discharges after a delay;

[0243] b) Section switch closed;

[0244] c) Segmented automatic switching;

[0245] d) Section switch maintenance;

[0246] e) Both incoming lines 1 and 2 are under maintenance;

[0247] f) Both incoming lines 3 and 4 are under maintenance;

[0248] g) Any TWJ fault in incoming lines 1-4 or any segment;

[0249] h) Either the switch on incoming lines 1 or 2 fails to trip;

[0250] i) Segmented rejection;

[0251] j) The substation side sends a blocking self-healing signal;

[0252] k) Exit via segmented automatic switching control word, or function hard pressure plate, or function soft pressure plate.

[0253] Discharge occurs if any of the above conditions are met.

[0254] (3) Figure 12 As shown, the automatic switching operation process of busbar 1(2) segment is as follows:

[0255] When charging is complete, bus 1(2) is de-energized and incoming lines 1(3) and 2(4) have no current, while bus 2(1) is energized. Then, the automatic transfer switch of bus 1(2) is activated. When [Chain 1 Series Power Supply Self-Healing Priority] is activated and Chain 1 Series Power Supply Self-Healing is discharged and Chain 1 Series Power Supply incoming line automatic transfer switch is energized, or when [Chain 1 Series Power Supply Self-Healing Priority] is deactivated and Chain 1 Series Power Supply incoming line automatic transfer switch is energized, after a delay of [Bus 1(2) Section Automatic Transfer Switch Trip Time], the switches of incoming lines 1(3) and 2(4) will trip.

[0256] After confirming that incoming line 1 (3) and incoming line 2 (4) have tripped and that bus 1 (2) is de-energized, the sections are closed after a delay of [section automatic switching closing time].

[0257] Embodiment 3 of this application provides a terminal, including a processor and a storage medium; the storage medium is used to store instructions; the processor is used to perform operations according to the instructions to execute the steps of the method.

[0258] Embodiment 4 of this application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method.

[0259] Compared with the prior art, the beneficial effects of this application include at least the following:

[0260] 1. This application system integrates a dual-chain self-healing mechanism. During normal operation, it automatically identifies the open-loop switch in the main wiring circuit of the chain-type power supply system. Using the open-loop switch as the basic point, it sets the self-healing system action logic corresponding to different faults occurring under various operating modes. When a fault occurs in the chain-type power supply network, the self-healing devices coordinate to perform comprehensive logic judgment, determine the fault location, and after the line protection device cuts off the fault, execute the fault isolation scheme. After confirming that the fault isolation is complete, it quickly closes the circuit breaker at the open loop point to restore power supply to the non-faulty loads. If the self-healing switch fails or self-healing is due to abnormal fiber optic discharge, the local incoming line backup automatic transfer switch is prioritized to close the circuit breaker at the open loop point again. If the incoming line closing fails, the local sectional backup automatic transfer switch trips the incoming line switch and finally closes the sectional switch. This effectively solves the problem of power restoration after a power outage in a two-line, three-station dual-chain power supply system and the problem of backup automatic transfer switch failure during fiber optic abnormalities.

[0261] 2. In this application, each chain-supply station is equipped with only one self-healing device to complete the regional self-healing of the two chain-supply systems, the automatic switching of the incoming line of each chain-supply station, and the segmented automatic switching, which reduces the number of devices and lowers the cost compared to the existing technology that requires five devices.

[0262] 3. The self-healing devices of each series power supply station in this application have the same program and adopt a masterless networking mode. They share information across the entire network through data interaction, eliminating the need for a central node, which improves system flexibility and fault tolerance, avoids single points of failure, and simplifies equipment management by adopting a masterless networking mode and data sharing technology, thereby reducing management costs.

[0263] 4. The local incoming line backup automatic transfer logic of this application can automatically perform local incoming line backup automatic transfer after the fiber optic communication network is interrupted due to external reasons in the chain-type series power supply mode, and can still ensure the restoration of power supply after the fault occurs, thereby improving the reliability and continuity of power supply.

[0264] 5. The local segmented automatic transfer logic of this application can be used to close the segmented switches of series power supply station 1 to 3 after the power supply on both sides of chain 1 or 2 is lost, so that the self-healing and incoming line automatic transfer of chain 1 and 2 will lose their function. At this time, the power supply of chain 1 or 2 can be reliably ensured by the local segmented automatic transfer operation.

[0265] 6. Current fiber optic communication equipment requires setting local identification codes, and for series power supply stations, identification codes for both the left and right sides need to be set. The process is cumbersome and prone to errors. This application uses a pairing method for inter-station communication, which reduces the difficulty of setting communication between field devices. The substation of the side station puts in the "Is the substation a side station?" control word, and the number is set to 1. The adjacent device is set to 2, and so on. The device matches with the adjacent device to check whether the local and adjacent numbers are consecutive, which can verify whether the configuration is correct. By setting the control word and number, the configuration of inter-station communication is simplified and the configuration difficulty is reduced.

[0266] This disclosure can be a system, method, and / or computer program product. A computer program product may include a computer-readable storage medium having computer-readable program instructions loaded thereon for causing a processor to implement various aspects of this disclosure.

[0267] Computer-readable storage media can be tangible devices capable of holding and storing instructions for use by an instruction execution device. Computer-readable storage media can be, for example—but not limited to—electrical storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of computer-readable storage media include: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital multifunction disc (DVD), memory sticks, floppy disks, mechanical encoding devices, such as punch cards or recessed protrusions storing instructions thereon, and any suitable combination of the foregoing. The computer-readable storage media used herein are not to be construed as transient signals themselves, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (e.g., light pulses through fiber optic cables), or electrical signals transmitted through wires.

[0268] The computer-readable program instructions described herein can be downloaded from computer-readable storage media to various computing / processing devices, or downloaded via a network, such as the Internet, local area network, wide area network, and / or wireless network, to an external computer or external storage device. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards them to the computer-readable storage media in the respective computing / processing device.

[0269] Computer program instructions used to perform the operations of this disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, status setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, etc., and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The computer-readable program instructions may execute entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or may be connected to an external computer (e.g., via the Internet using an Internet service provider). In some embodiments, electronic circuitry, such as programmable logic circuitry, field-programmable gate arrays (FPGAs), or programmable logic arrays (PLAs), is personalized by utilizing the status information of the computer-readable program instructions to implement various aspects of this disclosure.

[0270] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and not to limit them. Although this application has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of this application. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this application should be covered within the protection scope of the claims of this application.

Claims

1. A two-line three-station double link area self-healing control method suitable for two-line three-station double link area self-healing control method, the method is based on the realization of three-level recovery of two-line three-station double link area self-healing control system, characterized in that, The system comprises a string supply station 1, a string supply station 2 and a string supply station 3; Each string supply station is respectively configured with a self-healing device for collecting analog and switching quantity information of the station and interacting with self-healing devices of other string supply stations, and performing self-healing action logic of chain string supply main wiring, local incoming line backup automatic switching-on logic and local sectionalization backup automatic switching-on logic; Each string supply station is connected to bus 1 through incoming line 1 and incoming line 2, connected to bus 2 through incoming line 3 and incoming line 4, and connected to the interval between bus 1 and bus 2, wherein incoming line 1 and incoming line 2 are backup to each other, incoming line 3 and incoming line 4 are backup to each other, the interval between incoming line 1 and incoming line 3 is bound to string supply station channel 1 interval, and the interval between incoming line 2 and incoming line 4 is bound to string supply station channel 2 interval; Incoming line 1, incoming line 2 and bus 1 of each string supply station form chain string supply main wiring 1, and incoming line 3, incoming line 4 and bus 2 of each string supply station form chain string supply main wiring 2; The method suitable for two-line three-station double-chain regional self-healing control comprises: Each self-healing device collects analog and switching quantity information of the corresponding string supply station and interacts with the information, identifies the open-loop point in the corresponding main wiring when the chain string supply main wiring 1 and 2 are normally operated, and configures the self-healing action logic of the chain string supply main wiring according to the position of the open-loop point. When any chain string supply main wiring fails, fault analysis and self-healing reclosing are performed based on the information interacted between the self-healing devices and the self-healing action logic of the chain string supply main wiring region. If the self-healing reclosing is unsuccessful, the local incoming line backup automatic switching-on logic is executed to close the incoming line, and if the incoming line closing is unsuccessful, the local sectionalization backup automatic switching-on logic is executed to switch on the incoming line switch and close the sectionalization switch.

2. The method suitable for two-line three-station double-chain regional self-healing control according to claim 1, wherein: The system determines whether the corresponding string supply station is a boundary station through the [whether the substation is a boundary station] parameter setting value of the self-healing device; if the [whether the substation is a boundary station] parameter setting value is 1, it indicates that the corresponding string supply station is a boundary station adjacent to the power supply station, and if the [whether the substation is a boundary station] parameter setting value is 0, it indicates that the corresponding string supply station is an intermediate station.

3. The method suitable for two-line three-station double-chain regional self-healing control according to claim 1, wherein: The programs of the self-healing devices of each string supply station are the same, and a masterless mode is used for networking, the information of the whole network is shared through data interaction, and a central node is not required.

4. The method suitable for two-line three-station double-chain regional self-healing control according to any one of claims 1-3, wherein: The method of identifying the open-loop point in the corresponding main wiring when the chain string supply main wiring 1 and the chain string supply main wiring 2 are normally operated comprises: The switch position state of each chain string supply main wiring is analyzed, and the incoming line interval in which the switch position state is in the split position is identified as the open-loop point in the corresponding main wiring.

5. The method suitable for two-line three-station double-chain regional self-healing control according to claims 1-4, wherein: The method of configuring the self-healing action logic of the chain string supply main wiring according to the position of the opening point comprises: (1) setting the charging logic of the corresponding opening point device according to the position of the opening point, specifically as follows: (1.1) if the opening point is located in an intermediate station, setting the charging logic of the opening point device in the intermediate station: a) self-healing function is put into; b) [whether the substation is a side station] parameter set by the device is put out; c) self-healing discharge condition is not met; d) the bus of the device has voltage; e) both adjacent sides receive bus voltage sign; f) both adjacent sides receive no open point information flow; Meanwhile, the above conditions are met, and after a set delay, self-healing charging is completed, and self-healing charging completion information flow is sent to both sides of the self-healing device; (1.2) If the open point is located at the side station, set the charging logic of the side station open point device: a) self-healing function is put into; b) [whether the substation is a side station] parameter set by the device is put in; c) self-healing discharge condition is not met; d) the bus of the device has voltage; e) receive the bus voltage sign of the connected side of the channel and the voltage of the line extracted by the power supply station connected side; f) receive no open point information flow of the connected side of the channel; Meanwhile, the above conditions are met, and after a set delay, self-healing charging is completed, and self-healing charging completion information flow is sent to both sides of the self-healing device; (2) Set the charging logic of the non-open point device: a) self-healing function is put into; b) self-healing discharge condition is not met; c) the bus of the device has voltage; d) receive self-healing charging completion information flow of the device of the adjacent side of the channel; Meanwhile, the above conditions are met, and after a set delay, self-healing charging is completed, and self-healing charging completion information flow is sent to both sides of the self-healing device; (3) Set the chain type self-healing discharge logic: a) any main line trip, remote trip; b) self-healing is not started and any side has no voltage for a long time; c) self-healing function is put out; d) open point near-end fault; e) any main line is abnormal; f) self-healing is successfully or unsuccessfully closed; g) open point is in position or has flow; h) receive self-healing blocking input; If any of the above conditions is met, self-healing discharge.

6. The self-healing control method suitable for two-line three-station double-chain areas according to claim 5, characterized in that: the self-healing action logic based on the interaction between each self-healing device and the chain type main wiring area of the self-healing device is used for fault analysis and self-healing closing, including: Power 1 side bus fault: if the self-healing device of the chain supply station 1 judges that there is no flow in the line 1 switch and the bus 1 has no voltage and the line 1 switch line extracted voltage has no voltage, then after self-healing trip delay, the line 1 switch is tripped; if the line 1 switch of the chain supply station 1 is tripped, the self-healing start command is sent, and the self-healing device of the chain supply station 2 receives the self-healing start command under the condition that the self-healing charging is completed and the power 1 side has no voltage and the power 2 side has voltage, then the line 2 switch of the chain supply station 2 is closed after a delay, wherein power 1 and power 2 respectively refer to the power supply station connected by the line 1 and line 3 of the chain supply station 1; if the line 1 switch of the chain supply station 1 refuses to trip, then after a failure delay, the line 1, line 2 and bus coupler switch of the chain supply station 1 are tripped, and the command to trip the line 1 switch of the chain supply station 2 is sent to the chain supply station 2, the self-healing device of the chain supply station 2 receives the line 1 command under the condition that the self-healing charging is completed, then the line 1 switch of the chain supply station 2 is immediately tripped, if the line 1 switch of the chain supply station 2 is tripped, then the line 2 switch of the chain supply station 2 is closed after a delay; if the line 1 switch of the chain supply station 2 refuses to trip, self-healing discharge, indicating that the self-healing closing is unsuccessful; Power supply 2 bus 1 fault: if the self-healing device of string supply station 3 judges that the string supply station 3 incoming line 1 switch has no current and the bus 1 has no voltage and the string supply station 3 incoming line 1 switch line extraction voltage has no voltage, the self-healing tripping delay trips the string supply station 3 incoming line 1 switch; if the string supply station 3 incoming line 1 switch is tripped, the self-healing start command is sent, and the self-healing device of string supply station 2 receives the self-healing start command under the condition that the self-healing charging is completed, and the bus 1 of string supply station 2 has voltage, the incoming line 2 of string supply station 2 has no voltage, the incoming line 2 switch of string supply station 2 is closed after delay; if the string supply station 3 incoming line 1 switch refuses to trip, the self-healing is discharged. String supply station bus fault: the bus differential protection of the string supply station bus is configured to act on the self-healing input lock, and the self-healing device of the string supply station receives the bus differential protection action, and the self-healing is discharged.

7. The self-healing control method for a two-line three-station double-chain area according to claim 5, characterized in that: the self-healing action logic based on the information exchanged between the self-healing devices and the chain string supply main wiring area is used for fault analysis and self-healing closing, including: Power supply 1 and string supply station 1 line fault: a) normal action of line protection device: If the line optical differential protection of string supply station 1 trips the outgoing line 1 of power supply 1 and the incoming line 1 switch of string supply station 1, the self-healing device of string supply station 1 receives the incoming line 1 switch protection action signal, and the bus 1 has no voltage and the incoming line 1 switch has no current, the self-healing tripping delay trips the incoming line 1 switch; If the incoming line 1 switch of string supply station 1 is tripped, the self-healing start command is sent, and the self-healing device of string supply station 2 receives the self-healing start command from string supply station 1 under the condition that the self-healing charging is completed, and the power supply 1 has no voltage and the power supply 2 has voltage, the incoming line 2 switch of string supply station 2 is closed after delay; If the incoming line 1 switch of string supply station 1 refuses to trip, the incoming line 1, incoming line 2 and bus tie switch of string supply station 1 are tripped after the failure delay, and the incoming line 1 switch of string supply station 2 is tripped, the self-healing device of string supply station 2 receives the incoming line 1 switch tripping command under the condition that the self-healing charging is completed, and the incoming line 1 switch of string supply station 2 is immediately tripped, if the incoming line 1 switch of string supply station 2 is tripped, the incoming line 2 switch of string supply station 2 is closed after delay, and if the incoming line 1 switch of string supply station 2 refuses to trip, the self-healing is discharged; b) refusal of line protection device: If the self-healing device of string supply station 1 does not receive the incoming line 1 switch protection action signal, the self-healing tripping delay trips the incoming line 1 switch, if the incoming line 1 switch of string supply station 1 is tripped, the self-heating start command is sent, and the self-healing device of string supply station 2 receives the incoming line 1 switch protection action signal under the condition that the self-healing charging is completed, and the power supply 1 side has no voltage and the power supply 2 side has voltage, the incoming line 2 switch of string supply station 2 is closed after delay; ​ If the incoming line 1 switch of series power supply station 1 fails to trip, after a failure delay, the incoming line 1, incoming line 2, and bus tie switches of series power supply station 1 will trip, and a command to trip the incoming line 1 switch of series power supply station 2 will be sent. When the self-healing device of series power supply station 2 receives the command to trip the incoming line 1 switch after the self-healing charging is completed, it will immediately trip the incoming line 1 switch of series power supply station 2. If the incoming line 1 switch of series power supply station 2 trips, the incoming line 2 switch of series power supply station 2 will be closed after a delay. If the incoming line 1 switch of series power supply station 2 fails to trip, the self-healing discharge will occur, indicating that the self-healing circuit breaker has failed.

8. The self-healing control method for a two-line, three-station, dual-chain region according to claim 5, characterized in that: The fault analysis and self-healing gate based on the information exchanged between the respective healing devices and the self-healing action logic of the chain-type series power supply main wiring area includes: For faults in other lines besides incoming lines 1 and 2 of the series power supply station 1: the protection of other lines trips the corresponding switches of other lines. If the corresponding switches of other lines are open, no self-healing action is required. If the corresponding switches of other lines fail to trip, the backup protection of the power supply 1 outgoing line protection device trips the power supply 1 outgoing line switch. If both incoming lines 1 and 2 of the series power supply station 1 have no current and the differential protection of the bus of the series power supply station 1 does not operate, the incoming lines 1 and 2 of the series power supply station 1 will trip after a self-healing trip delay, and a tripping action command for incoming line 1 of the series power supply station 2 will be sent to the series power supply station 2. If both incoming lines 1 and 2 of the series power supply station 1 are open, a self-healing start command will be issued. The self-healing device of the series power supply station 2 will receive the self-healing start command after the self-healing charging is completed, and there is no voltage on the power supply 1 side and voltage on the power supply 2 side. Then, after a delay, the incoming line 2 switch of the series power supply station 2 will be closed. For faults in other lines outside incoming lines 1 and 2 of series power supply station 2 or other lines outside incoming lines 1 and 2 of series power supply station 3: the protection of other lines will trip the corresponding switches of other lines. If the corresponding switches of other lines trip, no self-healing action is required; if the corresponding switches of other lines fail to trip, self-healing discharge will occur.

9. A self-healing control method for a two-line, three-station, dual-chain region according to claim 5, characterized in that: The fault analysis and self-healing gate based on the information exchanged between the respective healing devices and the self-healing action logic of the chain-type series power supply main wiring area includes: Line fault between Series Supply Station 1 and Series Supply Station 2: The line optical differential protection of the line between Series Supply Station 1 and Series Supply Station 2 trips the incoming line 2 switch of Series Supply Station 1 and the incoming line 1 switch of Series Supply Station 2. If the self-healing device of Series Supply Station 2 receives the protection action signal of the incoming line 1 switch of Series Supply Station 2 and there is no voltage on bus 1 and no current in the incoming line 1 switch of Series Supply Station 2, then the incoming line 1 switch of Series Supply Station 2 will trip after a self-healing trip delay. If the incoming line 1 switch of Series Supply Station 2 opens and there is no voltage on bus 1 of Series Supply Station 2 and voltage on the incoming line of Series Supply Station 2, then the incoming line 2 switch of Series Supply Station 2 will close after a delay. If the incoming line 1 switch of Series Supply Station 2 opens... If the circuit breaker fails to trip, it will self-heal and discharge. If the self-healing device of the series power supply station 2 does not receive the protection action signal of the incoming line 1 switch of the series power supply station 2, and the incoming line 2 switch of the series power supply station 1 and the incoming line 1 switch of the series power supply station 2 have previously met the current direction inconsistency criterion, then after the incoming line 1 switch of the series power supply station 2 has no current and the bus 1 of the series power supply station 2 has no voltage, the incoming line 1 switch of the series power supply station 2 will trip after a self-healing trip delay. If the incoming line 1 switch of the series power supply station 2 trips and the bus 1 of the series power supply station 2 has no voltage and the incoming line of the incoming line 2 of the series power supply station 2 has voltage, then the incoming line 2 switch of the series power supply station 2 will close after a delay. If the incoming line 1 switch of the series power supply station 2 fails to trip, it will self-heal and discharge. Line fault between series power supply station 2 and series power supply station 3: The line protection of series power supply station 3 trips the incoming line 1 switch of series power supply station 3. If the incoming line 1 switch of series power supply station 3 trips, it will be locked and self-healed; if the incoming line 1 switch of series power supply station 3 fails to operate, it will self-heal and discharge.

10. A self-healing control method for a two-line, three-station, dual-chain region according to claim 5, characterized in that: The fault analysis and self-healing gate based on the information exchanged between the respective healing devices and the self-healing action logic of the chain-type series power supply main wiring area includes: Fault in the line between the series power supply station 3 and the power source 2: The line optical differential protection of the line between the series power supply station 3 and the power source 2 trips the incoming line 2 switch of the series power supply station 3 and the outgoing line switch of the power source 2. If the self-healing device of the series power supply station 3 receives the protection action signal of the incoming line 2 switch of the series power supply station 3 and the bus 1 of the series power supply station 3 is de-energized and the incoming line 2 switch of the series power supply station 3 has no current, then the incoming line 2 switch of the series power supply station 3 will trip after a self-healing trip delay. If the incoming line 2 switch of the series power supply station 3 trips, a self-healing start command is issued. The self-healing device of the series power supply station 2 receives the self-healing start command after the self-healing charging is completed and the bus 1 of the series power supply station 2 is energized and the incoming line of the incoming line 2 of the series power supply station 2 is de-energized. After a delay, the incoming line 1 switch of the series power supply station 2 will close. If the incoming line 2 switch of the series power supply station 3 fails to trip, then the self-healing discharge will occur. If the self-healing device of the series power supply station 3 does not receive the protection action signal of the incoming line 2 of the series power supply station 3, and based on the fact that the current direction inconsistency criterion was previously met by the incoming line 2 switch of the series power supply station 3 and the outgoing line switch of the power supply 2, the incoming line 1 switch of the series power supply station 3 will trip after a self-healing trip delay when there is no current in the incoming line 2 switch of the series power supply station 3 and no voltage on the bus. If the incoming line 1 switch of the series power supply station 3 trips, a self-healing start command will be issued. If the self-healing device of the series power supply station 2 receives the self-healing start command after the self-healing charging is completed and the bus 1 of the series power supply station 2 is energized and the incoming line 2 of the series power supply station 2 is de-energized, the incoming line 2 switch of the series power supply station 2 will close after a delay. If the incoming line 1 switch of the series power supply station 3 fails to trip, the self-healing discharge will occur.

11. A self-healing control method for a two-line, three-station, dual-chain region according to claim 5, characterized in that: The fault analysis and self-healing gate based on the information exchanged between the respective healing devices and the self-healing action logic of the chain-type series power supply main wiring area includes: If the circuit breaker of series power supply station 1 or series power supply station 3 trips unexpectedly, it is judged as a circuit breaker tripping unexpectedly when the circuit breaker is in the open position with no current but no manual trip signal is received and no protection action is taken. Depending on the situation, it is determined whether to lock out self-healing or start self-healing: If the incoming line 1 or incoming line 2 circuit breaker of series power supply station 1 trips unexpectedly, and bus 1 is de-energized, a self-healing start command is issued after a self-healing trip delay. The self-healing device of series power supply station 2 receives the self-healing start command after the self-healing charging is completed, and bus 1 is de-energized while incoming line 2 of series power supply station 2 is energized. After a delay, the incoming line 2 circuit breaker of series power supply station 2 is closed. If the incoming line 1 circuit breaker of series power supply station 3 trips unexpectedly, self-healing discharge is performed.

12. The self-healing control method for a two-line, three-station, dual-chain region according to claim 1, characterized in that: The local incoming line backup self-transfer logic includes: (1) Conditions for automatic power supply of incoming lines: Automatic transfer switch mode for incoming line 1: a) Circuit breaker refuses to trip; b) Automatic transfer switch is received; c) Circuit breaker for incoming line 2 is manually or remotely tripped; d) Incoming line 1 is under maintenance, or incoming line 2 is under maintenance, or busbar 1 is under maintenance; e) TWJ of incoming line 1 is abnormal, or TWJ of incoming line 2 is abnormal; f) Circuit breaker for incoming line 1 is closed; g) When power is supplied to incoming line 1, the voltage of incoming line 1 does not meet the requirement of being energized for more than 15 seconds; h) Any one of the automatic transfer switch setting control word, function hard switch, or function soft switch is deactivated. If any of the above conditions are met, the incoming line will automatically supply power. Incoming Line 2 Backup Automatic Transfer Method: a) Circuit breaker refuses to trip; b) Receives lockout for automatic transfer switch; c) Manually or remotely trips incoming line 1 circuit breaker; d) Incoming line 1 is under maintenance, or incoming line 2 is under maintenance, or busbar 1 is under maintenance; e) Incoming line 1 TWJ is abnormal, or incoming line 2 TWJ is abnormal; f) Incoming line 2 circuit breaker is closed; g) When checking the power supply to incoming line 2, the voltage of incoming line 2 does not meet the requirement of being energized for more than 15 seconds; h) Any one of the incoming line automatic transfer setting control word, or function hard switch, or function soft switch is deactivated; If any of the above conditions are met, the incoming line will automatically supply power. (2) Conditions for automatic transfer charging of incoming lines: Incoming line 1 backup automatic transfer mode: a) Busbar 1 has three-phase voltage; b) Incoming line 1 circuit breaker is open; c) Incoming line 2 circuit breaker is closed; d) When the closing position control word is activated, the incoming line 1 circuit breaker is closed; e) When the power supply 1 is activated, the incoming line 1 voltage meets the requirements for voltage; f) The conditions for automatic power supply of the incoming line are not met. If all the above conditions are met, the incoming line will automatically switch on and charge after a set delay. Incoming Line 2 Backup Automatic Transfer Method: a) Busbar 1 is energized in all three phases; b) Incoming line 2 circuit breaker is open; c) Incoming line 1 circuit breaker is closed; d) When the closing position control word is activated, the incoming line 2 circuit breaker is closed; e) When the power supply 2 is activated, the voltage of incoming line 2 meets the requirements for being energized; f) The conditions for automatic power supply of the incoming line are not met. If all the above conditions are met, the incoming line will automatically switch on and charge after a set delay. (3) Automatic transfer switch operation logic for incoming lines: Incoming line 1 backup automatic transfer mode: After the automatic transfer charging of incoming line 1 is completed, the voltage of bus 1 is lower than the bus no-voltage setting value, and the current of incoming line 2 is less than the current-free setting value of incoming line 2. When the "Check incoming line 1 voltage" control word is put on, the voltage of incoming line 1 is greater than the power supply voltage setting value. When the "Chain 1 series power supply self-healing priority" control word is put on and the chain series power supply main connection 1 self-healing discharges, or when the "Chain 1 series power supply self-healing priority" control word is put off, after the automatic transfer trip time delay of incoming line 1, the device reports "Trip incoming line 2 circuit breaker", and the output trips the incoming line 2 circuit breaker. If the incoming line 2 circuit breaker still does not trip after the delay, the automatic transfer is energized and reports "Automatic transfer trip failed". If it is confirmed that the incoming line 2 circuit breaker has tripped, the "trip incoming line 2 circuit breaker" command is revoked. After the automatic transfer closing time of incoming line 1, the "close incoming line 1 circuit breaker" command is reported and the incoming line 1 circuit breaker is closed. If the incoming line 1 circuit breaker still fails to close after the delay, the backup automatic transfer is energized and the "backup automatic transfer closing failed" command is reported. If it is confirmed that the incoming line 1 circuit breaker is closed, the "backup automatic transfer operation closed successfully" command is reported. Incoming Line 2 Backup Automatic Transfer Method: After the automatic transfer charging of incoming line 2 is completed, the voltage of bus 1 is lower than the bus no-voltage setting value, and the current of incoming line 1 is less than the current-free setting value of incoming line 1. When the "Check incoming line 2 voltage" control word is put on, the voltage of incoming line 2 is greater than the power supply voltage setting value. When the "Chain 1 series power supply self-healing priority" control word is put on and the chain series power supply main connection 2 self-healing discharges, or when the "Chain 1 series power supply self-healing priority" control word is put off, after the automatic transfer trip time delay of incoming line 2, the device reports "Trip incoming line 1 circuit breaker", and the output trips the incoming line 1 circuit breaker. If the incoming line 1 circuit breaker still does not trip after the delay, the automatic transfer is energized and reports "Automatic transfer trip failed". If it is confirmed that the incoming line 1 circuit breaker has tripped, the "trip incoming line 1 circuit breaker" command is revoked. After the automatic transfer closing time of incoming line 2, the command "close incoming line 2 circuit breaker" is reported and the incoming line 2 circuit breaker is closed. If the incoming line 2 circuit breaker still fails to close after the delay, the backup automatic transfer is energized and the command "backup automatic transfer closing unsuccessful" is reported. If it is confirmed that the incoming line 2 circuit breaker is closed, the command "backup automatic transfer operation closed successfully" is reported.

13. The self-healing control method for a two-line, three-station, dual-chain region according to claim 1, characterized in that: The local segmented backup automatic transfer logic described in step 3 includes: (1) On-site segmented backup charging conditions: a) Busbar 1 has three-phase voltage; b) Busbar 2 has three-phase voltage; c) One of the incoming line 1 and incoming line 2 switches is not under maintenance and is in the closed position; c) One of the incoming line 3 and incoming line 4 switches is not under maintenance and is in the closed position; d) The sectionalizing switch is in the open position. If all the above conditions are met, the on-site segmented automatic charging will be completed after a set delay. (2) Local segmented backup power supply conditions: a) If busbar X does not meet the voltage condition, after delayed discharge, when the automatic switching of section 1 is completed, X takes the value of 2; when the automatic switching of section 2 is completed, X takes the value of 1. b) Sectional switch closed; c) Sectional automatic transfer closed; d) Sectional switch under maintenance; e) Both incoming lines 1 and 2 under maintenance; f) Both incoming lines 3 and 4 under maintenance; g) Any TWJ abnormality in incoming lines 1-4 or any section; h) Any switch on incoming lines 1 and 2 refusing to trip; i) Sectional switch refusing to close; j) Substation side sends blocking self-healing signal; k) Any of the sectional automatic transfer setting control word, function hard switch, or function soft switch is deactivated; If any of the above conditions are met, on-site segmented backup power supply will be implemented; (3) Local segmented automatic transfer action logic: When charging is complete, busbar 1 is de-energized and incoming lines 1 and 2 have no current, while busbar 2 is energized. Then, the sectional automatic transfer switch logic is activated. When the "Chain 1 Series Power Self-Healing Priority" control word is engaged, and the Chain 1 Series Power Main Wiring Line 1 self-heals and discharges, and the Chain 1 Series Power Main Wiring Line 1 incoming line is energized, or when the "Chain 1 Series Power Self-Healing Priority" control word is disengaged and the Chain 1 Series Power Main Wiring Line 1 incoming line is energized, after the sectional automatic transfer switch 1 tripping time delay, incoming line 1 and incoming line 2 switches are tripped. After confirming that the incoming line 1 and incoming line 2 switches have tripped and the busbar is de-energized, after the sectional automatic transfer switch closing time delay, the sectional switches are closed. When charging is complete, busbar 2 is de-energized and incoming lines 3 and 4 have no current, while busbar 1 is energized. In this case, the sectional automatic transfer switch logic is activated. When the "Chain 1 Series Power Supply Self-Healing Priority" control word is engaged and the Chain 1 Series Power Supply Main Wiring 1 self-healing discharges and the Chain 1 Series Power Supply Main Wiring 1 incoming line is energized, or when the "Chain 1 Series Power Supply Self-Healing Priority" control word is disengaged and the Chain 1 Series Power Supply Main Wiring 1 incoming line is energized, after the sectional automatic transfer switch 2 tripping time delay, the incoming line 3 and 4 switches are tripped. After confirming that the incoming line 3 and 4 line switches have tripped and the busbar is de-energized, the sectional switches are closed after the sectional automatic transfer switch closing time delay.

14. A terminal, comprising a processor and a storage medium; characterized in that: The storage medium is used to store instructions; The processor is configured to operate according to the instructions to perform the steps of the method according to any one of claims 1-13.

15. A computer readable storage medium having stored thereon a computer program, characterized in that When executed by a processor, the program implements the steps of the method according to any one of claims 1-13.

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