Self-healing control system and method suitable for two-line three-station double-chain area

Abstract

The invention discloses a two-line three-station double-chain area self-healing control system and method, and the method comprises the steps that a self-healing device collects the analog quantity and switching value information of a corresponding series supply station, and carries out the information interaction; when the chained series supply main connection lines 1 and 2 normally operate, identifying open loop points in the corresponding main connection lines, and configuring self-healing action logic of the chained series supply main connection lines according to the positions of the open loop points; when any chained series supply main wiring has a fault, performing fault analysis and self-healing switching on the basis of interactive information between the respective healing devices and the self-healing action logic of the chained series supply main wiring area; if the self-healing switching is unsuccessful, the local incoming line spare power automatic switching logic is executed to perform incoming line switching, and if the incoming line switching is unsuccessful, the local segmented spare power automatic switching logic is executed to jump out an incoming line switch and close a segmented switch. According to the invention, the problems that the two-wire three-station double-chain power supply fails to restore power supply and the spare power automatic switching cannot act when the optical fiber is abnormal can be effectively solved.

Description

Technical Field

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

[0002] With the development of society, higher requirements are put forward for the stability of the power system. Among them, the double-chain power supply structure of two-terminal power supply and two lines and three stations solves the problems of the bearing and consumption of large-scale access of distributed power sources by constructing a high-voltage distribution network target grid that coordinates with the superior power grid, has a clear structure, and is safe and reliable, ensuring the safe and reliable operation of the distribution network.

[0003] In a two-line, three-station, double-chain series power supply system, there are usually two chain series power supply networks, and each chain series power supply network includes 3 series power supply stations. When a power failure occurs on one side, it will cause the related series power supply stations to lose voltage. Usually, the power supply recovery is realized by configuring an automatic bus transfer. The conventional standardized 110 kV automatic bus transfer can only access the electrical quantities of 3 intervals of "two incoming lines + one sectioning", and uses the bus transfer logic to switch the main power supply and the standby power supply. However, the two-line, three-station, double-chain series power supply structure belongs to "four incoming lines + one sectioning", and two incoming lines cannot be connected to the conventional 110 kV automatic bus transfer, so its transfer power supply ability cannot be fully exerted.

[0004] The patent with the application number 202310597699.3 proposes a method for automatically switching on the standby power supply applicable to a two-line, three-station, double-chain structure. However, it requires 5 devices and depends on the inter-station communication network. When the optical fiber communication is abnormal, the chain-type automatic switching-on function exits. Summary of the Invention

[0005] To solve the deficiencies in the prior art, this application provides a self-healing control system and method applicable to a two-line, three-station, double-chain area, which can implement a three-level recovery logic, give priority to chain-type self-healing, quickly isolate faults and close the open-loop point, trigger the local incoming line automatic bus transfer after self-healing fails, so that it can still operate when the optical fiber is abnormal, and finally enable the sectional automatic bus transfer to ensure power supply in extreme cases.

[0006] This application adopts the following technical solutions.

[0007] The first aspect of the present invention proposes a self-healing control system applicable to a two-line, three-station, double-chain area, including series power supply station 1, series power supply station 2, and series power supply station 3;

[0008] Each series power supply station is respectively configured with a self-healing device, which is used to collect the analog quantity and switch quantity information of this station and perform information interaction with the self-healing devices of other series power supply stations, and execute the self-healing action logic of the chain-type series main wiring, the local incoming line automatic bus transfer logic, and the local sectional automatic bus transfer logic;

[0009] Each series 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 sectional interval between bus 1 and bus 2. Among them, 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 the channel 1 interval of the series power supply station, and the interval between incoming line 2 and incoming line 4 is bound to the channel 2 interval of the series power supply station;

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

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

[0012] Preferably, the programs of the self-healing devices of each series power supply station are the same, and they are networked in a masterless mode, sharing the whole network information through data interaction without a central node.

[0013] The second aspect of the present invention proposes a self-healing control method applicable to the two-line three-station double-chain area, including:

[0014] Each self-healing device collects the analog quantity and switch quantity information of the corresponding series power supply station and conducts information interaction, identifies the open-loop points in the corresponding main wiring when the chain series power supply main wirings 1 and 2 are operating normally, and configures the self-healing action logic of the chain series power supply main wiring according to the positions of the open-loop points;

[0015] When any chain series power supply main wiring fails, based on the information exchanged between the self-healing devices and the self-healing action logic of the chain series power supply main wiring area, fault analysis and self-healing closing are carried out;

[0016] If the self-healing closing is not successful, the local incoming line backup power supply auto-switching logic is executed to close the incoming line. If the incoming line closing is not successful, the local sectional backup power supply auto-switching logic is executed to trip the incoming line switch and close the sectional switch.

[0017] Preferably, the identifying the open-loop points in the corresponding main wiring when the chain series power supply main wirings 1 and 2 are operating normally includes:

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

[0019] Preferably, the configuring the self-healing action logic of the chain series power supply main wiring according to the positions of the open-loop points includes:

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

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

[0022] a) The self-healing function is enabled; b) The parameter of [whether the substation is a side substation] set by the device is disabled; c) The self-healing discharge condition is not met; d) The bus of this device is energized; e) The bus voltage presence flags are received on both adjacent sides; f) The open-loop point information flow is not received on both adjacent sides;

[0023] When all the above conditions are met, after a set delay, the self-healing charging is completed, and at the same time, the self-healing charging completion information flow is sent to the self-healing devices on both sides;

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

[0025] a) The self-healing function is enabled; b) The parameter of [whether the substation is a side substation] set by the device is enabled; c) The self-healing discharge condition is not met; d) The bus of this device is energized; e) The bus voltage presence flag of the side connected by the channel is received and the line extraction voltage of the side connected to the power station is energized; f) The open-loop point information flow is not received on the side connected by the channel;

[0026] When all the above conditions are met, after a set delay, the self-healing charging is completed, and at the same time, the self-healing charging completion information flow is sent to the adjacent self-healing device;

[0027] (2) Set the charging logic for the non-open-loop point device:

[0028] a) The self-healing function is enabled; b) The self-healing discharge condition is not met; c) The bus of this device is energized; d) The self-healing charging completion information flow of the device on the adjacent side of the channel is received;

[0029] When all the above conditions are met, after a set delay, the self-healing charging is completed, and at the same time, the self-healing charging completion information flow is sent to the adjacent device;

[0030] (3) Set the self-healing discharge logic for the chain-type series power supply:

[0031] a) Any main line is manually tripped or remotely tripped; b) The self-healing is not started and any side is without voltage for a long time; c) The self-healing function is disabled; d) A fault occurs near the open-loop point; e) Any main line is abnormal; f) The self-healing reclosing is successful or failed; g) The open-loop point is in the closed position or there is current; h) A blocking self-healing input is received;

[0032] If any of the above conditions is met, the self-healing discharges.

[0033] Preferably, the fault analysis and self-healing reclosing are performed based on the information exchanged between the respective self-healing devices and the self-healing action logic in the chain-type series power supply main wiring area, including:

[0034] Bus fault on the power supply 1 side: If 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 line extraction voltage of the incoming line 1 switch has no voltage, then it trips the incoming line 1 switch after the self-healing tripping delay; if the incoming line 1 switch of the series power supply station 1 trips, a self-healing start command is sent. When the self-healing device of the series power supply station 2 receives the self-healing start command when the self-healing charging is completed and there is no voltage on the power supply 1 side and there is voltage on the power supply 2 side, it closes the incoming line 2 switch of the series power supply station 2 after a delay, where the power supply 1 and the power supply 2 respectively refer to the power supply stations connected to the incoming line 1 and the incoming line 3 of the series power supply station 1; if the incoming line 1 switch of the series power supply station 1 fails to trip, it trips the incoming line 1, incoming line 2, and bus-tie switches of the series power supply station 1 after the failure delay and sends a command to trip the incoming line 1 switch of the series power supply station 2 to the series power supply station 2. When the self-healing device of the series power supply station 2 receives the incoming line 1 command when the self-healing charging is completed, it immediately trips 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, it closes the incoming line 2 switch of the series power supply station 2 after a delay. If the incoming line 1 switch of the series power supply station 2 fails to trip, the self-healing discharges, indicating that the self-healing reclosing is unsuccessful;

[0035] Bus 1 fault of the power supply 2: 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, the bus 1 has no voltage, and the line extraction voltage of the incoming line 1 switch of the series power supply station 3 has no voltage, then it trips the incoming line 1 switch of the series power supply station 3 after the self-healing tripping delay; if the incoming line 1 switch of the series power supply station 3 trips, a self-healing start command is sent. When the self-healing device of the series power supply station 2 receives the self-healing start and there is voltage on the bus 1 of the series power supply station 2 and no voltage on the incoming line of the incoming line 2 of the series power supply station 2 when the self-healing charging is completed, it closes the incoming line 2 switch of the series power supply station 2 after a delay; if the incoming line 1 switch of the series power supply station 3 fails to trip, the self-healing discharges;

[0036] Bus fault of the series power supply station: The bus differential protection configured for the bus of the series power supply station acts to access the blocking self-healing input. When the self-healing device of the series power supply station receives the action of the bus differential protection, the self-healing discharges.

[0037] Preferably, the fault analysis and self-healing reclosing are performed based on the information exchanged between the respective self-healing devices and the self-healing action logic of the chain-type series power supply main wiring area, including:

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

[0039] a) The line protection device operates normally:

[0040] If the line optical differential protection of the series power supply station 1 trips the outgoing line 1 of the power supply 1 and the incoming line 1 switch of the series power supply station 1, and 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 has no voltage and the incoming line 1 switch has no current, then it trips the incoming line 1 switch after the self-healing tripping delay;

[0041] If the incoming line 1 switch of the series power supply station 1 trips, a self-healing start command is sent. 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 and the power supply 1 is without voltage while the power supply 2 has voltage after the self-healing charging is completed, the incoming line 2 switch of the series power supply station 2 is closed after a time delay;

[0042] If the incoming line 1 switch of the series power supply station 1 fails to trip, after the failure time delay, the incoming line 1, incoming line 2, and bus-tie switches of the series power supply station 1 trip and a command to trip the incoming line 1 switch of the series power supply station 2 is sent to the series power supply station 2. 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, the incoming line 1 switch of the series power supply station 2 immediately trips. 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 is closed after a time delay. If the incoming line 1 switch of the series power supply station 2 fails to trip, the self-healing discharges;

[0043] b) The 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 there is no current in the incoming line 1 switch, the bus 1 is without voltage, and the line extraction voltage of the incoming line 1 switch is without voltage, then the incoming line 1 switch trips after the self-healing tripping time delay;

[0045] If the incoming line 1 switch of the series power supply station 1 trips, a self-healing start command is sent. When the self-healing device of the series power supply station 2 receives the self-healing start command and the power supply 1 side is without voltage while the power supply 2 side has voltage after the self-healing charging is completed, the incoming line 2 switch of the series power supply station 2 is closed after a time delay;

[0046] If the incoming line 1 switch of the series power supply station 1 fails to trip, after the failure time delay, the incoming line 1, incoming line 2, and bus-tie switches of the series power supply station 1 trip and a command to trip the incoming line 1 switch of the series power supply station 2 is sent to the series power supply station 2. 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, the incoming line 1 switch of the series power supply station 2 immediately trips. 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 is closed after a time delay. If the incoming line 1 switch of the series power supply station 2 fails to trip, the self-healing discharges, indicating that the self-healing reclosing is unsuccessful;

[0047] Preferably, the fault analysis and self-healing reclosing are performed based on the information exchanged between the respective self-healing devices and the self-healing action logic of the chain series power supply main wiring area, including:

[0048] Faults in other lines other than the incoming line 1 and incoming line 2 of the string supply station 1: The protection of the other lines operates to trip the switches corresponding to the other lines. If the switches corresponding to the other lines trip, no self-healing action is required. If the switches corresponding to the other lines refuse to trip, the backup protection of the line protection device on the outgoing line of the power source 1 operates to trip the outgoing line switch of the power source 1. If the incoming line 1 and incoming line 2 switches of the string supply station 1 satisfy the condition of no current and the bus differential protection of the string supply station 1 does not operate, after the self-healing tripping delay, the incoming line 1 and incoming line 2 switches of the string supply station 1 are tripped, and a tripping command for the incoming line 1 of the string supply station 2 is sent to the string supply station 2. If the incoming line 1 and incoming line 2 switches of the string supply station 1 are both tripped, a self-healing start command is sent. When the self-healing device of the string supply station 2 receives the self-healing start command when the self-healing charging is completed and there is no voltage on the power source 1 side and there is voltage on the power source 2 side, the incoming line 2 switch of the string supply station 2 is closed after a delay.

[0049] Faults in other lines other than the incoming line 1 and incoming line 2 of the string supply station 2 or faults in other lines other than the incoming line 1 and incoming line 2 of the string supply station 3: The protection of the other lines operates to trip the switches corresponding to the other lines. If the switches corresponding to the other lines trip, no self-healing action is required. If the switches corresponding to the other lines refuse to trip, the self-healing discharges.

[0050] Preferably, the fault analysis and self-healing reclosing are performed based on the information exchanged between the respective self-healing devices and the self-healing action logic of the chain string supply main wiring area, including:

[0051] Fault in the line between the string supply station 1 and the string supply station 2: The line optical differential protection of the line between the string supply station 1 and the string supply station 2 operates to trip the incoming line 2 switch of the string supply station 1 and the incoming line 1 switch of the string supply station 2. If the self-healing device of the string supply station 2 receives the protection action signal of the incoming line 1 switch of the string supply station 2 and there is no voltage on the bus 1 and no current in the incoming line 1 switch of the string supply station 2, the incoming line 1 switch of the string supply station 2 is tripped after the self-healing tripping delay. If the incoming line 1 switch of the string supply station 2 trips and there is no voltage on the bus 1 of the string supply station 2 and there is voltage in the incoming line of the incoming line 2 of the string supply station 2, the incoming line 2 switch of the string supply station 2 is closed after a delay. If the incoming line 1 switch of the string supply station 2 refuses to trip, the self-healing discharges. If the self-healing device of the string supply station 2 does not receive the protection action signal of the incoming line 1 switch of the string supply station 2, and the incoming line 2 switch of the string supply station 1 and the incoming line 1 switch of the string supply station 2 once satisfied the current direction inconsistency criterion, then after there is no current in the incoming line 1 switch of the string supply station 2 and no voltage on the bus 1 of the string supply station 2, the incoming line 1 switch of the string supply station 2 is tripped after the self-healing tripping delay. If the incoming line 1 switch of the string supply station 2 trips and there is no voltage on the bus 1 of the string supply station 2 and there is voltage in the incoming line of the incoming line 2 of the string supply station 2, the incoming line 2 switch of the string supply station 2 is closed after a delay. If the incoming line 1 switch of the string supply station 2 refuses to trip, the self-healing discharges.

[0052] Fault in the line between the string supply station 2 and the string supply station 3: The line protection of the string supply station 3 operates to trip the incoming line 1 switch of the string supply station 3. If the incoming line 1 switch of the string supply station 3 trips, the self-healing is blocked. If the incoming line 1 switch of the string supply station 3 fails to operate, the self-healing discharges.

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

[0054] Line fault between the series connection station 3 and the power source 2: The line optical differential protection of the line between the series connection station 3 and the power source 2 acts to trip the incoming line 2 of the series connection station 3 and the outgoing line switch of the power source 2. If the self-healing device of the series connection station 3 receives the protection action signal of the incoming line 2 switch of the series connection station 3 and the bus 1 of the series connection station 3 has no voltage and the incoming line 2 switch of the series connection station 3 has no current, then the incoming line 2 switch of the series connection station 3 is tripped after the self-healing tripping delay; if the incoming line 2 switch of the series connection station 3 trips, a self-healing start command is sent. When the self-healing device of the series connection station 2 receives the self-healing start command when the self-healing charging is completed and the bus 1 of the series connection station 2 has voltage and the incoming line of the incoming line 2 of the series connection station 2 has no voltage, the incoming line 1 switch of the series connection station 2 is closed after a delay; if the incoming line 2 switch of the series connection station 3 refuses to trip, self-healing discharges.

[0055] If the self-healing device of the series connection station 3 does not receive the protection action signal of the incoming line 2 of the series connection station 3, and according to the current direction inconsistency criterion that the incoming line 2 switch of the series connection station 3 and the outgoing line switch of the power source 2 have ever met, then after the incoming line 2 switch of the series connection station 3 has no current and the bus has no voltage, the incoming line 1 switch of the series connection station 3 is tripped after the self-healing tripping delay; if the incoming line 1 switch of the series connection station 3 trips, a self-healing start command is sent. When the self-healing device of the series connection station 2 receives the self-healing start command when the self-healing charging is completed and the bus 1 of the series connection station 2 has voltage and the incoming line of the incoming line 2 of the series connection station 2 has no voltage, the incoming line 2 switch of the series connection station 2 is closed after a delay; if the incoming line 1 switch of the series connection station 3 refuses to trip, self-healing discharges.

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

[0057] Switch of the series connection station 1 or the series connection station 3 trips by mistake: The switch trips by mistake means that the switch is in the off position and has no current, but no manual trip switch signal is received and no protection action occurs, then it is judged that the switch trips by mistake, and it is determined whether to block self-healing or start self-healing according to different situations: If the incoming line 1 or incoming line 2 switch of the series connection station 1 trips by mistake, and after the bus 1 has no voltage, a self-healing start command is sent after the self-healing tripping delay. When the self-healing device of the series connection station 2 receives the self-healing start command when the self-healing charging is completed and the bus 1 has no voltage and the incoming line of the incoming line 2 of the series connection station 2 has voltage, the incoming line 2 switch of the series connection station 2 is closed after a delay; if the incoming line 1 switch of the series connection station 3 trips by mistake, self-healing discharges.

[0058] Preferably, the local incoming line backup power supply automatic switching logic includes:

[0059] (1) Conditions for discharging the incoming line backup power supply automatic switching

[0060] Incoming line 1 automatic backup power supply mode: a) The circuit breaker refuses to trip; b) The incoming line backup power supply blocking input is received; c) Manually trip or remotely trip the incoming line 2 circuit breaker; d) Incoming line 1 is under maintenance, or incoming line 2 is under maintenance, or bus 1 is under maintenance; e) The TWJ of incoming line 1 is abnormal or the TWJ of incoming line 2 is abnormal; f) The incoming line 1 circuit breaker is in the closed position; g) When checking that the incoming line 1 power supply is energized, the incoming line 1 voltage does not meet the requirement of having voltage for more than 15 s; h) Any one of the incoming line self - closing setting control word, or the function hard pressure plate, or the function soft pressure plate is withdrawn;

[0061] If any of the above conditions is met, the incoming line backup power supply is de - energized;

[0062] Incoming line 2 automatic backup power supply mode:

[0063] a) The circuit breaker refuses to trip; b) The incoming line backup power supply blocking input is received; c) Manually trip or remotely trip the incoming line 1 circuit breaker; d) Incoming line 1 is under maintenance, or incoming line 2 is under maintenance, or bus 1 is under maintenance; e) The TWJ of incoming line 1 is abnormal or the TWJ of incoming line 2 is abnormal; f) The incoming line 2 circuit breaker is in the closed position; g) When checking that the incoming line 2 power supply is energized, the incoming line 2 voltage does not meet the requirement of having voltage for more than 15 s; h) Any one of the incoming line self - closing setting control word, or the function hard pressure plate, or the function soft pressure plate is withdrawn;

[0064] If any of the above conditions is met, the incoming line backup power supply is de - energized;

[0065] (2) Incoming line backup power supply charging conditions:

[0066] Incoming line 1 automatic backup power supply mode:

[0067] a) The three - phase of bus 1 has voltage; b) The incoming line 1 circuit breaker is in the open position; c) The incoming line 2 circuit breaker is in the closed position; d) When the closing position control word is enabled, the incoming line 1 circuit breaker is in the closed - after state; e) When checking that the power supply 1 is energized, the incoming line 1 voltage meets the requirement of having voltage; f) The incoming line backup power supply de - energizing conditions are not met;

[0068] When all of the above conditions are met, after a set delay, the incoming line backup power supply charging is completed;

[0069] Incoming line 2 automatic backup power supply mode:

[0070] a) The three - phase of bus 1 has voltage; b) The incoming line 2 circuit breaker is in the open position; c) The incoming line 1 circuit breaker is in the closed position; d) When the closing position control word is enabled, the incoming line 2 circuit breaker is in the closed - after state; e) When checking that the power supply 2 is energized, the incoming line 2 voltage meets the requirement of having voltage; f) The incoming line backup power supply de - energizing conditions are not met;

[0071] When all of the above conditions are met, after a set delay, the incoming line backup power supply charging is completed;

[0072] (3) Incoming line backup power supply operation logic:

[0073] Incoming line 1 automatic backup power supply mode:

[0074] After the incoming line 1 spare power automatic switching device is charged, if the voltage of bus 1 is lower than the no-voltage setting value of the bus, and the current of incoming line 2 is less than the no-current setting value of incoming line 2, when the "check incoming line 1 voltage" control word is enabled and the voltage of incoming line 1 is greater than the energized voltage setting value, when the "chain 1 series power supply self-healing priority" control word is enabled and the chain series power supply main wiring 1 self-heals and discharges, or when the "chain 1 series power supply self-healing priority" control word is disabled, after the time delay of the incoming line 1 self-switching tripping, the device reports "trip incoming line 2 circuit breaker", and the outlet trips the incoming line 2 circuit breaker. If, after the time delay, the incoming line 2 circuit breaker still fails to trip, the spare power automatic switching device discharges and reports "spare power automatic switching tripping unsuccessful";

[0075] If it is confirmed that the incoming line 2 circuit breaker has tripped, the command of "trip incoming line 2 circuit breaker" is withdrawn. After the time delay of the incoming line 1 self-switching closing, it reports "close incoming line 1 circuit breaker" and the outlet closes the incoming line 1 circuit breaker. If, after the time delay, the incoming line 1 circuit breaker still fails to close, the spare power automatic switching device discharges and reports "spare power automatic switching closing unsuccessful"; If it is confirmed that the incoming line 1 circuit breaker has closed, it reports "spare power automatic switching action closing successful";

[0076] Incoming line 2 spare power automatic switching mode:

[0077] After the incoming line 2 spare power automatic switching device is charged, if the voltage of bus 1 is lower than the no-voltage setting value of the bus, and the current of incoming line 1 is less than the no-current setting value of incoming line 1, when the "check incoming line 2 voltage" control word is enabled and the voltage of incoming line 2 is greater than the energized voltage setting value, when the "chain 1 series power supply self-healing priority" control word is enabled and the chain series power supply main wiring 2 self-heals and discharges, or when the "chain 1 series power supply self-healing priority" control word is disabled, after the time delay of the incoming line 2 self-switching tripping, the device reports "trip incoming line 1 circuit breaker", and the outlet trips the incoming line 1 circuit breaker. If, after the time delay, the incoming line 1 circuit breaker still fails to trip, the spare power automatic switching device discharges and reports "spare power automatic switching tripping unsuccessful";

[0078] If it is confirmed that the incoming line 1 circuit breaker has tripped, the command of "trip incoming line 1 circuit breaker" is withdrawn. After the time delay of the incoming line 2 self-switching closing, it reports "close incoming line 2 circuit breaker" and the outlet closes the incoming line 2 circuit breaker. If, after the time delay, the incoming line 2 circuit breaker still fails to close, the spare power automatic switching device discharges and reports "spare power automatic switching closing unsuccessful"; If it is confirmed that the incoming line 2 circuit breaker has closed, it reports "spare power automatic switching action closing successful".

[0079] Preferably, the local sectional spare power automatic switching logic described in step 3 includes:

[0080] (1) Local sectional spare power automatic switching charging conditions:

[0081] a) The three phases of bus 1 are energized; b) The three phases of bus 2 are energized; c) One of the incoming line 1 and incoming line 2 switches is non-maintenance and in the closed position; c) One of the incoming line 3 and incoming line 4 switches is non-maintenance and in the closed position; d) The sectional switch is in the open position;

[0082] When the above conditions are met simultaneously, after the set delay, the local sectional spare power automatic switching device is charged;

[0083] (2) In-situ sectional backup automatic switching-on power-off conditions:

[0084] a) If bus X does not meet the energized condition and discharges after a time delay, when sectional automatic switching-on 1 is performed, X takes 2, and when sectional automatic switching-on 2 is performed, X takes 1;

[0085] b) The sectional switch is in the closed position; c) The sectional automatic switching-on is closed; d) The sectional switch is under maintenance; e) Both incoming lines 1 and 2 are under maintenance; f) Both incoming lines 3 and 4 are under maintenance; g) Any one of the TWJs of incoming lines 1-4 and the section is abnormal; h) Any one of the switches of incoming lines 1 and 2 fails to trip; i) The sectional switch fails to close; j) The substation side sends a signal to block self-healing; k) Any one of the sectional automatic switching-on setting control word, or function hard pressure plate, or function soft pressure plate is withdrawn;

[0086] Meeting any one of the above conditions will cause the in-situ sectional backup automatic switching-on to discharge;

[0087] (3) In-situ sectional backup automatic switching-on action logic:

[0088] After charging is completed, if bus 1 has no voltage and both incoming lines 1 and 2 have no current, and bus 2 has voltage, the sectional backup automatic switching-on logic is started. When the "chain 1 series power supply self-healing priority" control word is input and the chain series power supply main wiring 1 self-heals and discharges and the incoming line backup automatic switching-on of the chain series power supply main wiring 1 discharges, or when the "chain 1 series power supply self-healing priority" control word is withdrawn and the incoming line backup automatic switching-on of the chain series power supply main wiring 1 discharges, after a time delay of the sectional automatic switching-on 1 tripping time, trip the incoming lines 1 and 2 switches; after confirming that the incoming lines 1 and 2 line switches have tripped and the bus has no voltage, close the sectional switch after a time delay of the sectional automatic switching-on closing time;

[0089] After charging is completed, if bus 2 has no voltage and both incoming lines 3 and 4 have no current, and bus 1 has voltage, the sectional backup automatic switching-on logic is started. When the "chain 1 series power supply self-healing priority" control word is input and the chain series power supply main wiring 1 self-heals and discharges and the incoming line backup automatic switching-on of the chain series power supply main wiring 1 discharges, or when the "chain 1 series power supply self-healing priority" control word is withdrawn and the incoming line backup automatic switching-on of the chain series power supply main wiring 1 discharges, after a time delay of the sectional automatic switching-on 2 tripping time, trip the incoming lines 3 and 4 switches; after confirming that the incoming lines 3 and 4 line switches have tripped and the bus has no voltage, close the sectional switch after a time delay of the sectional automatic switching-on closing time.

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

[0091] The fourth aspect of the present invention proposes a computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, the steps of the method are implemented.

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

[0093] 1. The system of the present application integrates double-chain self-healing. When operating normally, it automatically identifies the switch at the open-loop point in the chain series supply main wiring loop, and takes the switch at the open-loop point as the basic point to set the action logic of the self-healing system for different faults occurring under various operating modes. When a fault occurs in the chain series supply network, through the cooperation between the self-healing devices, comprehensive logical judgment is carried out to determine the fault location. After the line protection device cuts off the fault, the fault isolation scheme is executed. After confirming the completion of the fault isolation, the circuit breaker at the open-loop point is quickly closed to restore the power supply to the non-faulty de-energized load. If the self-healing closing is unsuccessful or the self-healing is due to abnormal optical fiber discharge, the local incoming line backup power supply will act preferentially to close the circuit breaker at the open-loop point again. If the incoming line closing is unsuccessful, the local sectional backup power supply will act to trip the incoming line switch and finally close the sectional switch. It can effectively solve the problem of power supply restoration for two-line three-station double-chain power supply loss and the problem that the backup power supply cannot act when the optical fiber is abnormal.

[0094] 2. Each series supply station of the present application is only equipped with one self-healing device to complete the regional self-healing of 2 chain series supply systems, the incoming line self-switching and sectional self-switching of each series supply station, reducing the number of devices and lowering the cost compared with the need to configure 5 devices in the prior art.

[0095] 3. The programs of the self-healing devices at each series supply station of the present application are the same, and they are networked in a masterless mode. Through data interaction, the whole network information is shared without a central node, improving the flexibility and fault tolerance of the system, avoiding single-point failures. The masterless mode networking and data sharing technology simplify device management and can reduce management costs.

[0096] 4. The local incoming line backup power supply logic of the present application can automatically perform local incoming line backup power supply when the optical fiber communication network is interrupted due to external reasons in the chain series supply mode after self-healing discharge, and still ensure power supply restoration after a fault occurs, improving power supply reliability and continuity.

[0097] 5. The local sectional backup power supply logic of the present application can, after both power supplies on both sides of chain 1 or 2 are lost, and the self-healing and incoming line self-switching of chain 1 and 2 both lose their functions, at this time, the local sectional backup power supply can act to close the sectional switches of series supply stations 1 to 3, and be powered by chain 2 or 1 to ensure the reliable power supply of chain 1 or 2.

[0098] 6. Current optical fiber communication devices need to set the identification codes of the local and remote sides. For serial supply stations, the identification codes of the left and right sides need to be set, which is a cumbersome process and prone to errors. The communication pairing method between stations in this application simplifies the communication setting between field devices. For side stations, the substation inputs the control word "Whether the substation is a side station", and the number is set to 1. The adjacent device is set to 2, and so on. By matching the device with the adjacent device and judging whether the numbers of the local side and the adjacent side are consecutive, it can be verified whether the configuration is correct. Through the control word and number setting, the inter-station communication configuration is simplified and the configuration difficulty is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0099] Figure 1 It is a main wiring schematic diagram of a self-healing control method for a two-line, three-station, double-chain area provided by an embodiment of this application;

[0100] Figure 2 It is a charging logic of the open-loop point device of the intermediate station for the self-healing of a two-line, three-station, double-chain area provided by an embodiment of this application;

[0101] Figure 3 It is a charging logic of the open-loop point device of the side station for the self-healing of a two-line, three-station, double-chain area provided by an embodiment of this application;

[0102] Figure 4 It is a charging logic of the non-open-loop point device for the self-healing of a two-line, three-station, double-chain area provided by an embodiment of this application;

[0103] Figure 5 It is a discharging logic of the device for the self-healing of a two-line, three-station, double-chain area provided by an embodiment of this application;

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

[0105] Figure 7 It is a discharging logic of the incoming line spare power supply 1 of the device for the self-healing of a two-line, three-station, double-chain area provided by an embodiment of this application;

[0106] Figure 8 It is a charging logic of the incoming line spare power supply 1 of the device for the self-healing of a two-line, three-station, double-chain area provided by an embodiment of this application;

[0107] Figure 9 It is an operating logic of the incoming line spare power supply 1 of the device for the self-healing of a two-line, three-station, double-chain area provided by an embodiment of this application;

[0108] Figure 10 It is a discharging logic of the bus 1 sectional spare power supply of the device for the self-healing of a two-line, three-station, double-chain area provided by an embodiment of this application;

[0109] Figure 11 The charging logic of the sectional backup power supply automatic switching device for bus 1 of the two-line three-station double-chain area self-healing device provided by the embodiment of the present application;

[0110] Figure 12 The action logic of the sectional backup power supply automatic switching device for bus 1 of the two-line three-station double-chain area self-healing device provided by the embodiment of the present application. Specific embodiments

[0111] To make the purpose, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. The embodiments described in the present application are only a part of the embodiments of the present application, rather than all the embodiments. Based on the spirit of the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0112] Embodiment 1 of the present application provides a two-line three-station double-chain area self-healing control system, as Figure 1 shown: It can access 4 incoming line intervals and a sectional interval, and support the self-healing function of two independent chain-connected 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 a 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, and execute the self-healing action logic, local incoming line backup power supply automatic switching logic, and local sectional backup power supply automatic switching logic of the chain-connected series power supply main wiring;

[0114] Each series power supply station accesses incoming line 1 and incoming line 2 connected to bus 1, incoming line 3 and incoming line 4 connected to bus 2, and a sectional interval between bus 1 and bus 2. Among them, 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 intervals of incoming line 1 and incoming line 3 are bound to the series power supply station channel 1 interval, and the intervals of incoming line 2 and incoming line 4 are bound to the series power supply station channel 2 interval;

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

[0116] Further preferably, the intervals controlled by the self-healing logic of the chain-connected series power supply main wiring 1 are: incoming line 1 interval, incoming line 2 interval, sectional 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-connected series power supply main wiring 2 are: incoming line 3 interval, incoming line 4 interval, sectional 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 it is an edge substation by setting the parameter value of [whether the substation is an edge substation]. An edge substation refers to a substation where only one side of the channel is in use. The series-connected substation adjacent to the power station should be set to 1 if it is an edge substation, and the rest of the series-connected substations should be set to 0.

[0118] The system can determine the chain link order by setting the parameter value of [substation number]. The value range is 0-10. The [substation number] of the chain-connected series substation needs to be set according to the following rules: The [substation number] of the substation with only one side edge substation is set to 1, which is simply called the starting series substation. Starting from the starting series substation, the [substation number] of each series substation increases by 1 in turn. And the channel 2 of the starting series substation is used to connect to the channel 1 of the next adjacent series substation.

[0119] For the chain-connected series substation, the power station does not need to be equipped with a self-healing device, and only the series substation is equipped with a self-healing device. Taking the main wiring of two lines, three stations and double-chain series power supply as an example, the access methods of adjacent series substations ABC are as follows Figure 1 shown. The channel 1 of B station is connected to the channel 2 of A station, and the channel 2 of B station is connected to the channel 1 of C station.

[0120] A leaderless system composed of 3 self-healing devices for series substations, that is, the programs of each device are the same and can be installed flexibly.

[0121] The self-healing device collects bus voltage, line voltage and current through the analog quantity acquisition plug-in, collects the positions of 4 lines and 1 sectional breaker, and transmits the analog quantity and switch quantity information to the adjacent side device through optical fiber. At the same time, it also receives the analog quantity and switch quantity information sent from the adjacent side device. Each device can obtain all the analog quantity and switch quantity 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 and double-chain area, including:

[0123] Step 1: Each self-healing device collects the analog quantity and switch quantity information of the corresponding series substation and conducts information interaction. When the chain-connected series main wiring 1 and 2 are operating normally, identify the open-loop point in the corresponding main wiring and configure the self-healing action logic of the chain-connected series main wiring according to the position of the open-loop point.

[0124] Further preferably, among the 6 breaker switches of two independent chain-connected series main wirings, there is only 1 breaker switch in the open position, which is called the open-loop point, and the remaining 5 switches are in the closed position; the sectional switch of each series substation is in the open position, and the 4 incoming line switches can be in the open position or the closed position according to the chain-connected series power supply method. Therefore, analyze the switch position states of the 6 incoming line intervals in each chain-connected series main wiring, and identify the incoming line interval where the switch position state is in the open position as the open-loop point in the corresponding main wiring.

[0125] The charging logic of the chain-style collusive confession self-healing device varies according to the position of the open-loop point. The self-healing action logic of the main wiring of the chain-style collusive confession is configured according to the position of the open-loop point, including:

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

[0127] (1.1) If the open-loop point is located at the intermediate substation, set the charging logic of the device at the open-loop point of the intermediate substation as shown in Figure 2 :

[0128] a) The self-healing function is enabled;

[0129] b) The [whether the substation is a boundary substation] parameter set by the device is disabled, indicating that the device is used at the intermediate substation rather than the boundary substation; the fixed value of this parameter is set to 0 to indicate disable, and set to 1 to indicate enable;

[0130] c) The self-healing discharge condition is not met;

[0131] d) The bus of this device is energized;

[0132] e) Bus voltage presence flags are received on both adjacent sides;

[0133] f) Open-loop point information flows are not received on both adjacent sides.

[0134] When all the above conditions are met, the charging is completed after [10s], and a self-healing charging completion information flow is sent to both sides simultaneously.

[0135] (1.2) If the open-loop point is located at the boundary substation, set the charging logic of the device at the open-loop point of the boundary substation as shown in Figure 3 :

[0136] a) The self-healing function is enabled;

[0137] b) The [whether the substation is a boundary substation] parameter set by the device is enabled, indicating that the device is used at the boundary substation;

[0138] c) The self-healing discharge condition is not met;

[0139] d) The bus of this device is energized;

[0140] e) A bus voltage presence flag is received on the side connected by the channel and the extracted voltage of the line connected to the power supply substation is energized;

[0141] f) An open-loop point information flow is not received on the side connected by the channel.

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

[0143] (2) Set the charging logic of the non-open-loop point device as shown in Figure 4 :

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

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

[0146] c) The bus of this device is energized;

[0147] d) Receive the information flow indicating the completion of self-healing charging from the device on the side connected to the channel.

[0148] When the above conditions are met simultaneously, after a set delay, the self-healing charging is completed, and at the same time, an information flow indicating the completion of self-healing charging is sent to the device on the adjacent side;

[0149] (3) Set the chain-type series power supply self-healing discharge logic as Figure 5 shown:

[0150] a) Any main line is manually tripped or remotely tripped;

[0151] b) Self-healing is not started and any side is without voltage for a long time; (the extracted voltage of the line on the side where the edge station is connected to the power supply station is without voltage for a long time);

[0152] c) Self-healing function is disabled;

[0153] d) A fault occurs near the open-loop point;

[0154] e) Any main line is abnormal (bus PT is disconnected, main line is under maintenance, TWJ is abnormal, CT is disconnected, or communication fails);

[0155] f) Self-healing reclosing is successful or fails;

[0156] g) The open-loop point is in the closed position or there is current;

[0157] h) Receive the blocking self-healing input;

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

[0159] Step 2: When a fault occurs in any chain-type series power supply main wiring, perform fault analysis and self-healing reclosing based on the information exchanged between the respective self-healing devices and the self-healing action logic in the area of the chain-type series power supply main wiring;

[0160] Further preferably, the self-healing action process of the chain-type series power supply: As Figure 6 shown, taking the incoming line 2 switch of substation 2 in the single-loop network series power supply loop formed by power sources S1 and S4 as the open-loop point in hot standby as an example, the self-healing action logic for other switches in open-loop hot standby is similar and will not be elaborated. The fault of two lines and three substations is shown in Table 1.

[0161] Table 1 Schematic diagram of the fault of two lines and three substations

[0162]

[0163] 1) Bus fault on the power supply 1 side

[0164] If the self-healing device of the series power supply station 1 determines that the incoming line 1 switch (switch 102) has no current, the bus 1 has no voltage, and the line extraction voltage of the incoming line 1 switch has no voltage, then after the self-healing tripping delay, the incoming line 1 switch is tripped;

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

[0166] If the incoming line 1 switch of the series power supply station 1 refuses to trip, then after the failure delay, the incoming line 1, incoming line 2, and bus-tie switches (switches 102, 103, 501) of the series power supply station 1 are tripped, and a command to trip the incoming line 1 switch of the series power supply station 2 is sent to the series power supply station 2. When the self-healing device of the series power supply station 2 receives the incoming line 1 command when the self-healing charging is completed, it immediately trips the incoming line 1 switch (switch 104) 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 is closed. If the incoming line 1 switch of the series power supply station 2 refuses to trip, then the self-healing discharges, indicating that the self-healing closing is unsuccessful;

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

[0168] a) The line protection device operates normally:

[0169] If the line optical differential protection of the series power supply station 1 operates to trip the outgoing line 1 switch (switch 101) of the power supply 1 and the incoming line 1 (switch 102) of the series power supply station 1, and the self-healing device of the series power supply station 1 receives the protection operation signal of the incoming line 1 switch (switch 102), and the bus 1 has no voltage and the incoming line 1 switch (switch 102) of the series power supply station 1 has no current, then after the self-healing tripping delay, the incoming line 1 switch (switch 102) of the series power supply station 1 is tripped;

[0170] If the incoming line 1 (switch 102) of the series power supply station 1 trips, a self-healing start command is sent. 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 when the self-healing charging is completed, and the power supply 1 has no voltage and the power supply 2 has voltage, then after a delay, the incoming line 2 switch (switch 105) of the series power supply station 2 is closed;

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

[0172] b) Failure of the line protection device to operate:

[0173] If the self-healing device of the series power supply station 1 does not receive the protection operation signal of the incoming line 1 switch (switch 102), the action behavior will be the same as that of the F1 fault, that is, the self-healing device of the series power supply station 1 determines that there is no current in the incoming line 1 switch (switch 102), there is no voltage on bus 1, and there is no voltage in the line extraction voltage of the incoming line 1 switch (switch 102), then after the self-healing tripping time delay, the incoming line 1 switch (switch 102) will trip;

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

[0175] If the incoming line 1 switch (switch 102) of the series power supply station 1 fails to trip, after the failure time delay, the incoming line 1, incoming line 2, and bus tie switch (switches 102, 103, and 501) of the series power supply station 1 will trip and send a command to trip the incoming line 1 switch (switch 104) of the series power supply station 2. If the self-healing device of the series power supply station 2 receives the command to trip the incoming line 1 switch (switch 104) when the self-healing charging is completed, it will immediately trip the incoming line 1 switch (switch 104) of the series power supply station 2. If the incoming line 1 switch (switch 104) of the series power supply station 2 trips, after a time delay, the incoming line 2 switch (switch 105) of the series power supply station 2 will be closed. If the incoming line 1 switch (switch 104) of the series power supply station 2 fails to trip, the self-healing will discharge, indicating that the self-healing reclosing is unsuccessful;

[0176] 3) Bus 1 fault of the series power supply station 1 (F3 fault)

[0177] The bus differential protection configured for bus 1 of the series power supply station 1 operates and accesses the blocking self-healing input. When the self-healing device of the series power supply station 1 receives the operation of the bus differential protection, the self-healing will discharge;

[0178] Bus 1 fault of the series power supply station 2 (F6 fault)

[0179] The bus differential protection action configured for the bus of String-Supply Station 2 is connected to the blocking self-healing input. When the self-healing device of String-Supply Station 2 receives the bus differential protection action, the self-healing discharges;

[0180] Bus 1 of String-Supply Station 3 fails (F9 fault)

[0181] The bus differential protection action configured for the bus of String-Supply Station 3 is connected to the blocking self-healing input. When the self-healing device of String-Supply Station 3 receives the bus differential protection action, the self-healing discharges;

[0182] 4) Other line faults (F4 fault) outside Incoming Line 1 and Incoming Line 2 of String-Supply Station 1

[0183] The protection of other lines trips the corresponding switches of other lines (Switch 106). If the corresponding switches of other lines trip, there is no need for self-healing action; if the corresponding switches of other lines refuse to trip, the backup protection of the line protection device on the outgoing line of Power Supply 1 trips the outgoing line switch of Power Supply 1 (Switch 101);

[0184] If the switches of Incoming Line 1 and Incoming Line 2 of String-Supply Station 1 (Switches 102 and 103) meet the condition of no current and the bus differential protection of String-Supply Station 1 does not act, after the self-healing tripping delay, the switches of Incoming Line 1 and Incoming Line 2 of String-Supply Station 1 (Switches 102 and 103) are tripped, and an action command to trip Incoming Line 1 of String-Supply Station 2 (Switch 104) is sent to String-Supply Station 2; if the switches of Incoming Line 1 and Incoming Line 2 of String-Supply Station 1 (Switches 102 and 103) are both tripped, a self-healing start command is sent. When 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 there is no voltage on the side of Power Supply 1 and there is voltage on the side of Power Supply 2, the incoming line 2 switch of String-Supply Station 2 (Switch 105) is closed after a delay;

[0185] 5) Line fault (F5 fault) between String-Supply Station 1 and String-Supply Station 2

[0186] The optical differential protection of the line between String-Supply Station 1 and String-Supply Station 2 trips the incoming line 2 switch of String-Supply Station 1 and the incoming line 1 switch of String-Supply Station 2 (Switches 103 and 104). If the self-healing device of String-Supply Station 2 receives the protection action signal of the incoming line 1 switch of String-Supply Station 2 (Switch 104) and there is no voltage on Bus 1 and no current in the incoming line 1 switch of String-Supply Station 2, the incoming line 1 switch of String-Supply Station 2 is tripped after the self-healing tripping delay; if the incoming line 1 of String-Supply Station 2 (Switch 104) is tripped and there is no voltage on Bus 1 of String-Supply Station 2 and there is voltage on the incoming line of the incoming line 2 of String-Supply Station 2 (Switch 105), the incoming line 2 switch of String-Supply Station 2 (Switch 105) is closed after a delay; if the incoming line 1 switch of String-Supply Station 2 (Switch 104) refuses to trip, the self-healing discharges;

[0187] If the self-healing device of the collusive power supply station 2 does not receive the protection action signal of the incoming line 1 switch (switch 104) of the collusive power supply station 2, and the incoming line 2 switch of the collusive power supply station 1 and the incoming line 1 switches (switches 103 and 104) of the collusive power supply station 2 have ever met the criterion of inconsistent current directions, then after the incoming line 1 switch (switch 104) of the collusive power supply station 2 has no current and the bus 1 of the collusive power supply station 2 has no voltage, the incoming line 1 switch (switch 104) of the collusive power supply station 2 is tripped after the self-healing tripping delay; if the incoming line 1 switch (switch 104) of the collusive power supply station 2 trips and the bus 1 of the collusive power supply station 2 has no voltage and the incoming line of the incoming line 2 (switch 105) of the collusive power supply station 2 has voltage, then the incoming line 2 switch (switch 105) of the collusive power supply station 2 is closed after a delay; if the incoming line 1 switch (switch 104) of the collusive power supply station 2 refuses to trip, then self-healing discharges;

[0188] 6) Other line faults (F7 faults) outside the incoming line 1 and incoming line 2 of the collusive power supply station 2

[0189] The protection of other lines of the collusive power supply station 2 acts to trip the corresponding switch (switch 107) of other lines. If the corresponding switch of other lines trips, then no self-healing action is required; if the corresponding switch of other lines refuses to trip, then self-healing discharges;

[0190] Other line faults (F10 faults) outside the incoming line 1 and incoming line 2 of the collusive power supply station 3

[0191] The protection of other lines of the collusive power supply station 3 acts to trip the corresponding switch (switch 407) of other lines. If the corresponding switch of other lines trips, then no self-healing action is required; if the corresponding switch of other lines refuses to trip, then self-healing discharges;

[0192] 7) Line faults (F8 faults) between the collusive power supply station 2 and the collusive power supply station 3

[0193] The line protection of the collusive power supply station 3 acts to trip the incoming line 1 switch (switch 405) of the collusive power supply station 3. If the incoming line 1 switch (switch 405) of the collusive power supply station 3 trips, then self-healing is blocked; if the incoming line 1 switch (switch 405) of the collusive power supply station 3 fails to operate, then self-healing discharges;

[0194] 8) Line faults (F11 faults) between the collusive power supply station 3 and the power supply 2

[0195] The line optical difference protection of the line between the tandem power supply station 3 and the power supply 2 operates to trip the incoming line 2 of the tandem power supply station 3 and the outgoing line switches of the power supply 2 (switch 404 and switch 401). If the self-healing device of the tandem power supply station 3 receives the protection operation signal of the incoming line 2 switch (switch 404) of the tandem power supply station 3, and there is no voltage on bus 1 of the tandem power supply station 3 and no current in the incoming line 2 switch (switch 404) of the tandem power supply station 3, then the incoming line 2 switch (switch 404) of the tandem power supply station 3 is tripped after the self-healing tripping delay; if the incoming line 2 switch (switch 404) of the tandem power supply station 3 trips, a self-healing start command is sent. When the self-healing device of the tandem power supply station 2 receives the self-healing start command when the self-healing charging is completed, and there is voltage on bus 1 of the tandem power supply station 2 and no voltage in the incoming line of the incoming line 2 of the tandem power supply station 2, the incoming line 1 switch (switch 105) of the tandem power supply station 2 is closed after a delay; if the incoming line 2 switch (switch 404) of the tandem power supply station 3 refuses to trip, then self-healing discharges;

[0196] If the self-healing device of the tandem power supply station 3 does not receive the protection operation signal of the incoming line 2 (switch 404) of the tandem power supply station 3, and according to the fact that the incoming line 2 switch of the tandem power supply station 3 and the outgoing line switches of the power supply 2 (switch 404 and switch 401) have ever met the current direction inconsistency criterion, then after there is no current in the incoming line 2 (switch 404) switch of the tandem power supply station 3 and no voltage on the bus, the incoming line 1 switch (switch 405) of the tandem power supply station 3 is tripped after the self-healing tripping delay; if the incoming line 1 switch (switch 405) of the tandem power supply station 3 trips, a self-healing start command is sent. When the self-healing device of the tandem power supply station 2 receives the self-healing start when the self-healing charging is completed, and there is voltage on bus 1 of the tandem power supply station 2 and no voltage in the incoming line of the incoming line 2 (switch 105) of the tandem power supply station 2, the incoming line 2 switch (switch 105) of the tandem power supply station 2 is closed after a delay; if the incoming line 1 switch (switch 405) of the tandem power supply station 3 refuses to trip, then self-healing discharges;

[0197] 9) Fault on bus 1 of power supply 2 (F12 fault)

[0198] If the self-healing device of the tandem power supply station 3 determines that there is no current in the incoming line 1 switch (switch 405) of the tandem power supply station 3, no voltage on bus 1, and no voltage in the line extraction voltage of the incoming line 1 switch (switch 405) of the tandem power supply station 3, then the incoming line 1 (switch 405) switch of the tandem power supply station 3 is tripped after the self-healing tripping delay; if the incoming line 1 (switch 405) switch of the tandem power supply station 3 trips, a self-healing start command is sent. When the self-healing device of the tandem power supply station 2 receives the self-healing start when the self-healing charging is completed, and there is voltage on bus 1 of the tandem power supply station 2 and no voltage in the incoming line of the incoming line 2 (switch 105) of the tandem power supply station 2, the incoming line 2 switch (switch 105) of the tandem power supply station 2 is closed after a delay; if the incoming line 1 switch (switch 405) of the tandem power supply station 3 refuses to trip, then self-healing discharges;

[0199] 10) The switch of tandem power supply station 1 or tandem power supply station 3 trips secretly

[0200] A switch trips secretly when the switch is in the off position and there is no current, but no manual trip switch signal is received and no protection operation occurs. Then it is determined that the switch trips secretly, and it is determined whether to block self-healing or start self-healing according to different situations:

[0201] If the incoming line 1 or incoming line 2 switch (switch 102 or 103) of the series power supply station 1 trips secretly, and after the bus 1 has no voltage and the self-healing tripping delay has passed, a self-healing start command is sent. When the self-healing device of the series power supply station 2 receives the self-healing start command and the bus 1 has no voltage and the incoming line 2 (switch 105) of the series power supply station 2 has voltage during the completion of self-healing charging, the incoming line 2 switch (switch 105) of the series power supply station 2 is closed after a time delay;

[0202] If the incoming line 1 switch (switch 405) of the series power supply station 3 trips secretly, then self-healing discharges.

[0203] Step 3: If the self-healing closing is unsuccessful, the local incoming line backup power supply automatic switching logic is executed to close the incoming line switch. If the incoming line closing is unsuccessful, the local sectional backup power supply automatic switching logic is executed to trip the incoming line switch and close the sectional switch.

[0204] 1. Incoming line backup power supply automatic switching: Incoming line 1 and incoming line 2 are in standby with each other, that is, 1DL and 2DL are in standby with each other. Incoming line 3 and incoming line 4 are in standby with each other, that is, 3DL and 4DL are in standby with each other.

[0205] (1) Discharge conditions for the incoming line 1(2) backup power supply automatic switching mode, such as Figure 7 shown:

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

[0207] b) The incoming line backup power supply automatic switching is blocked by an input signal;

[0208] c) Manually trip or remotely trip the incoming line 2(1) circuit breaker;

[0209] d) Incoming line 1 is under maintenance or incoming line 2 is under maintenance or bus 1 is under maintenance;

[0210] e) The TWJ of incoming line 1 is abnormal or the TWJ of incoming line 2 is abnormal;

[0211] f) The incoming line 1(2) circuit breaker is in the closed position;

[0212] g) When checking that the incoming line 1(2) power supply is energized, the incoming line 1(2) voltage does not meet the requirement of having voltage for more than 15 s;

[0213] h) Any one of the incoming line self-switching setting control word, or the function hard pressure plate, or the function soft pressure plate is withdrawn.

[0214] Discharge occurs when any one of the above conditions is met.

[0215] (2) Charging conditions for the incoming line 1(2) backup power supply automatic switching mode are as Figure 8 shown:

[0216] a) The three phases of bus 1 are energized;

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

[0218] c) The incoming line 2(1) circuit breaker is in the closed position;

[0219] d) When the post - closing position control word is enabled, the incoming line 1(2) circuit breaker is in the post - closing state;

[0220] e) When it is detected that the incoming line 1(2) power supply is energized, the voltage of the incoming line 1(2) meets the requirement of having voltage;

[0221] f) The discharge condition is not met;

[0222] When the above conditions are met simultaneously, the charging is completed after 10 s.

[0223] (3) The operation logic of the incoming line backup power supply automatic switching device is as Figure 9 shown:

[0224] After the charging of the incoming line 1(2) backup power supply automatic switching device is completed, when the voltage of bus 1 is lower than [bus no - voltage setting value], and the current of the incoming line 2(1) is less than [no - current setting value of power supply 2(1)], when the [detect incoming line 1(2) voltage] control word is enabled and the voltage of the incoming line 1(2) is greater than [power - on voltage setting value], when [chain - type 1 series - supply self - healing priority] is enabled and the chain - type 1(2) series - supply self - healing discharges, or when [chain - type 1 series - supply self - healing priority] is disabled, after a delay of [incoming line 1(2) self - tripping time], the device reports "trip the incoming line 2(1) circuit breaker", and the outlet trips the incoming line 2(1) circuit breaker. If after a delay of 5S, the incoming line 2(1) circuit breaker still fails to trip, the backup power supply automatic switching device discharges and reports "backup power supply automatic switching trip failure".

[0225] If it is confirmed that the power supply 2(1) circuit breaker has tripped, then the command of "trip the power supply (1)2 circuit breaker" is withdrawn. After a delay of [incoming line 1(2) self - closing time], it reports "close the incoming line 1(2) circuit breaker" and the outlet closes the power supply (2)1 circuit breaker. If after a delay of 5S, the incoming line 1(2) circuit breaker still fails to close, the backup power supply automatic switching device discharges and reports "backup power supply automatic switching closing failure".

[0226] If it is confirmed that the incoming line 1(2) circuit breaker has closed, then it reports "backup power supply automatic switching action closing success".

[0227] After the incoming line 1(2) is closed, the accelerated protection after the incoming line 1(2) is closed is started to avoid the incoming line 1(2) closing on a fault.

[0228] 2. The distributed power distribution protection self - healing device for this bus can access the voltage of another bus to achieve the local sectional backup power supply automatic switching function. Before the sectional self - switching, the incoming line 1 and incoming line 2 switches on this bus are tripped first.

[0229] When a fault occurs and causes a section of the busbar to lose power, if [chain-type 1 series power supply with self-healing priority] is enabled, the open-loop point switch of the single-loop series power supply is first self-healed. If the series power supply self-healing is unsuccessful and the incoming line of this busbar is self-powered and discharged, the local sectional self-switching function is then realized. If [chain-type 1 series power supply with self-healing priority] is disabled and the incoming line of this busbar is self-powered and discharged, the local sectional self-switching function is then realized.

[0230] The tripping object of the backup power supply automatic switching device is the line switch of this busbar. After any one of the main lines is overhauled, the self-healing function is blocked, but the backup power supply automatic switching function remains enabled; when both of the main line switches of this busbar are overhauled, the backup power supply automatic switching function is disabled.

[0231] After the backup power supply automatic switching device closes the sectional switch, it starts the post-closing acceleration protection of the sectional switch to avoid closing on a fault.

[0232] The device has the sectional 1(2) backup power supply automatic switching function.

[0233] (1) The logic functions are described as follows:

[0234] As Figure 10 shown, the charging conditions for the sectional backup power supply automatic switching of busbar 1(2) are:

[0235] a) The three phases of busbar 1 are energized.

[0236] b) The three phases of busbar 2 are energized.

[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 sectional switch is in the open position.

[0240] When the above conditions are met simultaneously, the charging is completed after 10s.

[0241] (2) As Figure 11 shown, the discharging conditions for the sectional backup power supply automatic switching of busbar 1(2) are:

[0242] a) The other section of the busbar does not meet the energized condition and discharges after a time delay.

[0243] b) The sectional switch is in the closed position.

[0244] c) The sectional backup power supply automatic switching closes.

[0245] d) The sectional switch is under maintenance.

[0246] e) Both incoming line 1 and incoming line 2 are under maintenance.

[0247] f) Both incoming line 3 and incoming line 4 are under maintenance.

[0248] g) Any abnormality in the TWJ of any of the incoming lines 1-4 or the sectionalizer.

[0249] h) Any of the switches of incoming lines 1 and 2 fails to trip.

[0250] i) The sectionalizer fails to close.

[0251] j) The substation side sends a signal to lock the self-healing.

[0252] k) Any of the sectionalizer automatic switching setting control word, or the function hard pressure plate, or the function soft pressure plate is withdrawn.

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

[0254] (3) As Figure 12 shown, the operation process of the bus 1(2) sectional automatic switching:

[0255] After the charging is completed, when the bus 1(2) has no voltage and both incoming lines 1(3) and incoming lines 2(4) have no current, and the bus 2(1) has voltage, the bus 1(2) sectional automatic switching is started. When [chain 1 series power supply self-healing priority] is input and chain 1 series power supply self-healing discharges and chain 1 series power supply incoming line automatic switching discharges, or when [chain 1 series power supply self-healing priority] is withdrawn and chain 1 series power supply incoming line automatic switching discharges, after a delay of [bus 1(2) sectional automatic switching tripping time], the incoming line 1(3) and incoming line 2(4) switches are tripped.

[0256] After confirming that the incoming line 1(3) and incoming line 2(4) lines are tripped and the bus 1(2) has no voltage, the sectionalizer is closed after a delay of [sectional automatic switching closing time].

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

[0258] Embodiment 4 of the present application provides a computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, the steps of the method are implemented.

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

[0260] 1. The system of this application integrates double-chain self-healing. When operating normally, it automatically identifies the switch at the open-loop point in the chain-type collusive connection main wiring circuit, and takes the switch at the open-loop point as the basic point to set the self-healing system action logic for different faults occurring under various operating modes. When a fault occurs in the chain-type collusive connection network, through the cooperation between self-healing devices, comprehensive logical judgment is carried out to determine the fault location. After the line protection device cuts off the fault, the fault isolation scheme is executed. After confirming the completion of fault isolation, the circuit breaker at the open-loop point is quickly closed to restore the power supply to the non-faulty de-energized load. If the self-healing closing is unsuccessful or the self-healing is due to abnormal optical fiber discharge, the local incoming line backup automatic switching device preferentially operates to close the circuit breaker at the open-loop point again. If the incoming line closing is unsuccessful, the local sectional backup automatic switching device then operates to trip the incoming line switch and finally close the sectional switch. It can effectively solve the problem of power supply restoration for two-line three-station double-chain power supply and the problem that the backup automatic switching device cannot operate when the optical fiber is abnormal.

[0261] 2. Each collusive connection station of this application is only equipped with one self-healing device to complete the regional self-healing of 2 chain-type collusive connection systems, the incoming line automatic switching and sectional automatic switching of each collusive connection station, reducing the number of devices and lowering the cost compared with the need to configure 5 devices in the prior art.

[0262] 3. The programs of the self-healing devices of each collusive connection station of this application are the same, and they are networked in a masterless mode. By sharing the whole network information through data interaction, no central node is required, improving the flexibility and fault tolerance of the system, avoiding single-point failures. The masterless mode networking and data sharing technology simplify device management and can reduce management costs.

[0263] 4. The local incoming line backup automatic switching logic of this application can automatically perform local incoming line backup automatic switching after the optical fiber communication network is interrupted due to external reasons and the self-healing discharges in the chain-type collusive connection mode, still ensuring power supply restoration after a fault occurs, improving power supply reliability and sustainability.

[0264] 5. The local sectional backup automatic switching logic of this application can, after both power supplies on both sides of chain 1 or 2 are lost and the self-healing and incoming line automatic switching of chain 1 and 2 both lose their functions, close the sectional switches of collusive connection stations 1 to 3 through the action of the local sectional backup automatic switching device, and be powered by chain 2 or 1 to ensure the reliable power supply of chain 1 or 2.

[0265] 6. The current optical fiber communication equipment needs to set the identification code of the opposite side, and for collusive connection stations, the identification codes on both the left and right sides need to be set, with cumbersome steps and prone to errors. The communication pairing method between stations of this application reduces the communication setting difficulty between on-site devices. The substation at the edge station inputs the control word "whether the substation is an edge station", the numbering is set to 1, and the adjacent device is 2, and so on. The device matches with the adjacent device to judge whether the local and adjacent side numbers are continuous to verify whether the configuration is correct. Through the control word and numbering setting, the inter-station communication configuration is simplified and the configuration difficulty is reduced.

[0266] The present disclosure may be a system, a method, and / or a computer program product. The computer program product may include a computer-readable storage medium having computer-readable program instructions thereon for causing a processor to implement aspects of the present disclosure.

[0267] The computer-readable storage medium may be a tangible device that can retain and store instructions for use by an instruction execution device. The computer-readable storage medium may be, for example—but not limited to—an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), a static random access memory (SRAM), a portable compact disc read-only memory (CD-ROM), a digital versatile disc (DVD), a memory stick, a floppy disk, a mechanically encoded device such as a punch card or raised structures in grooves having instructions stored thereon, and any suitable combination of the foregoing. The computer-readable storage medium as used herein is not to be construed as a transitory signal per se, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagating through a waveguide or other transmission medium (e.g., a light pulse through an optical fiber cable), or an electrical signal transmitted through a wire.

[0268] The computer-readable program instructions described herein may be downloaded to respective computing / processing devices from a computer-readable storage medium or may be downloaded to an external computer or an external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network may include copper transmission cables, optical fiber 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 the computer-readable program instructions for storage in a computer-readable storage medium in each computing / processing device.

[0269] The computer program instructions for performing the operations of the present disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, state-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 be executed entirely on the user's computer, partially on the user's computer, executed as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through 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., through the Internet using an Internet service provider). In some embodiments, by using the state information of the computer-readable program instructions to customize an electronic circuit, such as a programmable logic circuit, a field-programmable gate array (FPGA), or a programmable logic array (PLA), the electronic circuit can execute the computer-readable program instructions to implement various aspects of the present disclosure.

[0270] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and not to limit them. Although the present application has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the specific implementation manners of the present application can still be modified or equivalently replaced, and any modification or equivalent replacement that does not depart from the spirit and scope of the present application shall be covered by the protection scope of the claims of the present application.

Claims

1. A two-wire three-station double-chain area self-healing control system, characterized in that It includes collusion stations 1, 2, and 3; Each collusion station is respectively equipped with a self-healing device, which is used to collect the analog and digital quantity information of this station, interact with the self-healing devices of other collusion stations, and execute the self-healing action logic of the chain collusion main wiring, the local incoming line backup power supply switching logic, and the local sectional backup power supply switching logic; Each collusion 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 sectional interval between bus 1 and bus 2. Among them, 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 intervals of incoming line 1 and incoming line 3 are bound to the interval of collusion station channel 1, and the intervals of incoming line 2 and incoming line 4 are bound to the interval of collusion station channel 2; The incoming line 1, incoming line 2 of each collusion station and bus 1 form a chain collusion main wiring 1, and the incoming line 3, incoming line 4 of each collusion station and bus 2 form a chain collusion main wiring 2.

2. A two-line three-station double-chain area self-healing control system according to claim 1, characterized in that: The system determines whether the corresponding collusion station is a boundary station through the parameter setting value of [whether the substation is a boundary station] of the self-healing device; if the parameter setting value of [whether the substation is a boundary station] is 1, it means that the corresponding collusion station is a boundary station and is adjacent to the power supply station. If the parameter setting value of [whether the substation is a boundary station] is 0, it means that the corresponding collusion station is an intermediate station.

3. A two-line three-station double-chain area self-healing control system according to claim 1, characterized in that: The programs of the self-healing devices of each collusion station are the same, and they are networked in a masterless mode, sharing the whole network information through data interaction, and no central node is required.

4. A self-healing control method applicable to a two-line three-station double-chain region, which realizes three-level restoration based on the system described in any one of claims 1-3, and is characterized in that The method includes: Each self-healing device collects the analog and digital quantity information of the corresponding collusion station and conducts information interaction. When the chain collusion main wirings 1 and 2 are operating normally, it identifies the open-loop points in the corresponding main wirings and configures the self-healing action logic of the chain collusion main wirings according to the positions of the open-loop points; When any chain collusion main wiring fails, based on the information interacted between the self-healing devices and the self-healing action logic of the chain collusion main wiring area, fault analysis and self-healing reclosing are performed; If the self-healing reclosing is unsuccessful, the local incoming line backup power supply switching logic is executed to perform incoming line closing. If the incoming line closing is unsuccessful, the local sectional backup power supply switching logic is executed to trip the incoming line switch and close the sectional switch.

5. A two-line three-station double-chain area self-healing control method according to claim 4, characterized in that: The identification of the open-loop points in the corresponding main wirings when the chain collusion main wirings 1 and 2 are operating normally includes: Analyzing the switch position states of the 6 incoming line intervals in each chain collusion main wiring, and identifying the incoming line intervals where the switch position states are in the off position as the open-loop points in the corresponding main wirings.

6. A two-line three-station double-chain area self-healing control method according to claim 4, characterized in that: The configuration of the self-healing action logic of the chain collusion main wiring according to the positions of the open-loop points includes: (1) Setting the charging logic of the corresponding open-loop point device according to the position of the open-loop point, specifically as follows: (1.1) If the open-loop point is located at the intermediate station, set the charging logic of the open-loop point device at the intermediate station: a) Self-healing function enabled; b) Parameter of [whether the substation is an edge substation] set by the device disabled; c) Self-healing discharge condition not met; d) Bus of this device has voltage; e) Bus voltage presence flags are received on both adjacent sides; f) Information flow indicating no open-loop point is received on both adjacent sides; When the above conditions are met simultaneously, after a set delay, self-healing charging is completed, and an information flow indicating the completion of self-healing charging is sent to the self-healing devices on both sides; (1.2) If the open-loop point is located at an edge substation, set the charging logic for the open-loop point device at the edge substation: a) Self-healing function enabled; b) Parameter of [whether the substation is an edge substation] set by the device enabled; c) Self-healing discharge condition not met; d) Bus of this device has voltage; e) Bus voltage presence flag of the side connected by the channel is received and the extracted voltage of the line connected to the power source station on the side connected to the power source station has voltage; f) Information flow indicating no open-loop point is received from the side connected by the channel; When the above conditions are met simultaneously, after a set delay, self-healing charging is completed, and an information flow indicating the completion of self-healing charging is sent to the adjacent self-healing device; (2) Set the charging logic for non-open-loop point devices: a) Self-healing function enabled; b) Self-healing discharge condition not met; c) Bus of this device has voltage; d) Information flow indicating the completion of self-healing charging of the device on the adjacent side of the channel is received; When the above conditions are met simultaneously, after a set delay, self-healing charging is completed, and an information flow indicating the completion of self-healing charging is sent to the adjacent device; (3) Set the self-healing discharge logic for chain-type series power supply: a) Any main line is manually tripped or remotely tripped; b) Self-healing is not started and any side has been without voltage for a long time; c) Self-healing function disabled; d) Fault near the open-loop point; e) Any main line is abnormal; f) Self-healing reclosing is successful or failed; g) Open-loop point is in closed position or has current; h) Blocking self-healing input is received; If any one of the above conditions is met, self-healing discharge occurs.

7. A self-healing control method applicable to a two-line, three-station, double-chain area according to claim 6, characterized in that: Fault analysis and self-healing reclosing are performed based on the information exchanged between the respective self-healing devices and the self-healing action logic of the chain-type series power supply main wiring area, including: Bus fault on the power source 1 side: If 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 extracted voltage of the incoming line 1 switch line has no voltage, then the incoming line 1 switch is tripped after the self-healing tripping delay; if the incoming line 1 switch of the series power supply station 1 trips, a self-healing start command is sent. When the self-healing device of the series power supply station 2 receives the self-healing start command when self-healing charging is completed and the power source 1 side has no voltage and the power source 2 side has voltage, then the incoming line 2 switch of the series power supply station 2 is closed after a delay, where the power source 1 and the power source 2 respectively refer to the power source stations connected to the incoming line 1 and the incoming line 3 of the series power supply station 1; if the incoming line 1 switch of the series power supply station 1 fails to trip, then after the failure delay, the incoming line 1, incoming line 2, and bus tie switches of the series power supply station 1 are tripped and a command to trip the incoming line 1 switch of the series power supply station 2 is sent to the series power supply station 2. When the self-healing device of the series power supply station 2 receives the incoming line 1 command when self-healing charging is completed, it immediately trips 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, then the incoming line 2 switch of the series power supply station 2 is closed after a delay. If the incoming line 1 switch of the series power supply station 2 fails to trip, self-healing discharge occurs, indicating that the self-healing reclosing is not successful; Power supply 2 bus 1 failure: If the self-healing device of the series-fed substation 3 determines that there is no current in the incoming line 1 switch of the series-fed substation 3, the bus 1 has no voltage, and the line extraction voltage of the incoming line 1 switch of the series-fed substation 3 is without voltage, then the incoming line 1 switch of the series-fed substation 3 is tripped after the self-healing tripping delay; if the incoming line 1 switch of the series-fed substation 3 trips, a self-healing start command is sent. When the self-healing device of the series-fed substation 2 receives the self-healing start and the bus 1 of the series-fed substation 2 has voltage and the incoming line of the incoming line 2 of the series-fed substation 2 has no voltage after the self-healing charging is completed, then the incoming line 2 switch of the series-fed substation 2 is closed after a delay; if the incoming line 1 switch of the series-fed substation 3 fails to trip, the self-healing discharges. Series-fed substation bus failure: The bus differential protection configured for the series-fed substation bus acts to access the blocking self-healing input. When the self-healing device of the series-fed substation receives the bus differential protection action, the self-healing discharges.

8. A self-healing control method applicable to a two-line three-station double-chain area according to claim 6, characterized in that: Fault analysis and self-healing reclosing are performed based on the information exchanged between the respective self-healing devices and the self-healing action logic of the chain-type series-fed main wiring area, including: Line fault between power supply 1 and series-fed substation 1: a) The line protection device operates normally: If the line optical differential protection of series-fed substation 1 trips the outgoing line 1 of power supply 1 and the incoming line 1 switch of series-fed substation 1, and the self-healing device of series-fed substation 1 receives the protection action signal of the incoming line 1 switch, and the bus 1 has no voltage and the incoming line 1 switch has no current, then the incoming line 1 switch is tripped after the self-healing tripping delay; If the incoming line 1 switch of series-fed substation 1 trips, a self-healing start command is sent. When the self-healing device of series-fed substation 2 receives the self-healing start command from series-fed substation 1 and power supply 1 has no voltage and power supply 2 has voltage after the self-healing charging is completed, then the incoming line 2 switch of series-fed substation 2 is closed after a delay; If the incoming line 1 switch of series-fed substation 1 fails to trip, after the failure delay, the incoming line 1, incoming line 2, and bus tie switches of series-fed substation 1 trip and send a command to trip the incoming line 1 switch of series-fed substation 2 to series-fed substation 2. When the self-healing device of series-fed substation 2 receives the command to trip the incoming line 1 switch after the self-healing charging is completed, it immediately trips the incoming line 1 switch of series-fed substation 2. If the incoming line 1 switch of series-fed substation 2 trips, the incoming line 2 switch of series-fed substation 2 is closed after a delay. If the incoming line 1 switch of series-fed substation 2 fails to trip, the self-healing discharges; b) The line protection device refuses to operate: If the self-healing device of series-fed substation 1 does not receive the protection action signal of the incoming line 1 switch, then the self-healing device of series-fed substation 1 determines that there is no current in the incoming line 1 switch, the bus 1 has no voltage, and the line extraction voltage of the incoming line 1 switch is without voltage, then the incoming line 1 switch is tripped after the self-healing tripping delay; If the incoming line 1 switch of series-fed substation 1 trips, a self-healing start command is sent. When the self-healing device of series-fed substation 2 receives the self-healing start command and power supply 1 side has no voltage and power supply 2 side has voltage after the self-healing charging is completed, then the incoming line 2 switch of series-fed substation 2 is closed after a delay; If the incoming line 1 switch of the series power supply station 1 fails to trip, after the failure delay, the incoming line 1, incoming line 2, and bus-tie switch of the series power supply station 1 are tripped, and a command to trip the incoming line 1 switch of the series power supply station 2 is sent to the series power supply station 2. When the self-healing device of the series power supply station 2 receives the command to trip the incoming line 1 switch under the condition that the self-healing charging is completed, it immediately trips 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 is closed after a delay. If the incoming line 1 switch of the series power supply station 2 fails to trip, the self-healing discharges, indicating that the self-healing reclosing is unsuccessful.

9. The self-healing control method for a two-line three-station double-chain area according to claim 6, characterized in that: Performing fault analysis and self-healing reclosing based on the information exchanged between the respective self-healing devices and the self-healing action logic of the chain-type series power supply main wiring area, including: Faults on other lines outside the incoming line 1 and incoming line 2 of the series power supply station 1: The protection of the other line operates to trip the corresponding switch of the other line. If the corresponding switch of the other line trips, no self-healing action is required; if the corresponding switch of the other line fails to trip, the backup protection of the outgoing line protection device of the power source 1 operates to trip the outgoing line switch of the power source 1; if the incoming line 1 and incoming line 2 switches of the series power supply station 1 satisfy the condition of no current and the bus differential protection of the series power supply station 1 does not operate, after the self-healing tripping delay, the incoming line 1 and incoming line 2 switches of the series power supply station 1 are tripped, and an action command to trip the incoming line 1 of the series power supply station 2 is sent to the series power supply station 2; if the incoming line 1 and incoming line 2 switches of the series power supply station 1 are both tripped, a self-healing start command is sent. When the self-healing device of the series power supply station 2 receives the self-healing start command under the condition that the self-healing charging is completed and there is no voltage on the power source 1 side and there is voltage on the power source 2 side, the incoming line 2 switch of the series power supply station 2 is closed after a delay; Faults on other lines outside the incoming line 1 and incoming line 2 of the series power supply station 2 or faults on other lines outside the incoming line 1 and incoming line 2 of the series power supply station 3: The protection of the other line operates to trip the corresponding switch of the other line. If the corresponding switch of the other line trips, no self-healing action is required; if the corresponding switch of the other line fails to trip, the self-healing discharges.

10. The self-healing control method for a two-line three-station double-chain area according to claim 6, characterized in that: Performing fault analysis and self-healing reclosing based on the information exchanged between the respective self-healing devices and the self-healing action logic of the chain-type series power supply main wiring area, including: Line fault between collusive confession station 1 and collusive confession station 2: The line optical differential protection of the line between collusive confession station 1 and collusive confession station 2 acts to trip the incoming line 2 switch of collusive confession station 1 and the incoming line 1 switch of collusive confession station 2. If the self-healing device of collusive confession station 2 receives the protection action signal of the incoming line 1 switch of collusive confession station 2 and bus 1 has no voltage, and the incoming line 1 switch of collusive confession station 2 has no current, then the incoming line 1 switch of collusive confession station 2 is tripped after the self-healing tripping delay; if the incoming line 1 switch of collusive confession station 2 trips and bus 1 of collusive confession station 2 has no voltage, and the incoming line of incoming line 2 of collusive confession station 2 has voltage, then the incoming line 2 switch of collusive confession station 2 is closed after a delay; if the incoming line 1 switch of collusive confession station 2 refuses to trip, then self-healing discharges; if the self-healing device of collusive confession station 2 does not receive the protection action signal of the incoming line 1 switch of collusive confession station 2, and the incoming line 2 switch of collusive confession station 1 and the incoming line 1 switch of collusive confession station 2 have ever met the current direction inconsistency criterion, then after the incoming line 1 switch of collusive confession station 2 has no current and bus 1 of collusive confession station 2 has no voltage, the incoming line 1 switch of collusive confession station 2 is tripped after the self-healing tripping delay; if the incoming line 1 switch of collusive confession station 2 trips and bus 1 of collusive confession station 2 has no voltage, and the incoming line of incoming line 2 of collusive confession station 2 has voltage, then the incoming line 2 switch of collusive confession station 2 is closed after a delay; if the incoming line 1 switch of collusive confession station 2 refuses to trip, then self-healing discharges; Line fault between collusive confession station 2 and collusive confession station 3: The line protection of collusive confession station 3 acts to trip the incoming line 1 switch of collusive confession station 3. If the incoming line 1 switch of collusive confession station 3 trips, then self-healing is blocked; if the incoming line 1 switch of collusive confession station 3 fails to operate, then self-healing discharges.

11. A self-healing control method applicable to a two-line three-station double-chain area according to claim 6, characterized in that: Fault analysis and self-healing reclosing are carried out based on the information exchanged between the respective self-healing devices and the self-healing action logic of the chain collusive confession main wiring area, including: Line fault between collusive confession station 3 and power supply 2: The line optical differential protection of the line between collusive confession station 3 and power supply 2 acts to trip the incoming line 2 of collusive confession station 3 and the outgoing line switch of power supply 2. If the self-healing device of collusive confession station 3 receives the protection action signal of the incoming line 2 switch of collusive confession station 3 and bus 1 of collusive confession station 3 has no voltage, and the incoming line 2 switch of collusive confession station 3 has no current, then the incoming line 2 switch of collusive confession station 3 is tripped after the self-healing tripping delay; if the incoming line 2 switch of collusive confession station 3 trips, then a self-healing start command is sent. The self-healing device of collusive confession station 2 receives the self-healing start command when the self-healing charging is completed and bus 1 of collusive confession station 2 has voltage, and the incoming line of incoming line 2 of collusive confession station 2 has no voltage, and the incoming line 1 switch of collusive confession station 2 is closed after a delay; if the incoming line 2 switch of collusive confession station 3 refuses to trip, then self-healing discharges; If the self-healing device of collusive confession station 3 does not receive the protection action signal of the incoming line 2 of collusive confession station 3, according to the current direction inconsistency criterion that the incoming line 2 switch of collusive confession station 3 and the outgoing line switch of power supply 2 have ever met, then after the incoming line 2 switch of collusive confession station 3 has no current and the bus has no voltage, the incoming line 1 switch of collusive confession station 3 is tripped after the self-healing tripping delay; if the incoming line 1 switch of collusive confession station 3 trips, then a self-healing start command is sent. The self-healing device of collusive confession station 2 receives the self-healing start and bus 1 of collusive confession station 2 has voltage, and the incoming line of incoming line 2 of collusive confession station 2 has no voltage when the self-healing charging is completed, then the incoming line 2 switch of collusive confession station 2 is closed after a delay; if the incoming line 1 switch of collusive confession station 3 refuses to trip, then self-healing discharges.

12. A self-healing control method for a two-line three-station double-chain area as claimed in claim 6, characterized in that: Fault analysis and self-healing reclosing are carried out based on the information exchanged between the respective self-healing devices and the self-healing action logic of the chained series-connected main wiring area, including: Switch sneak tripping of the series-connected station 1 or series-connected station 3: Switch sneak tripping means that the switch is in the open position without current but no manual switch tripping signal is received and no protection action occurs, then it is judged as switch sneak tripping. According to different situations, it is determined whether to block self-healing or start self-healing: If the incoming line 1 or incoming line 2 switch of the series-connected station 1 sneaks tripping, and after the bus 1 has no voltage and passes the self-healing tripping delay, a self-healing start command is sent. The self-healing device of the series-connected station 2 receives the self-healing start command when the self-healing charging is completed, the bus 1 has no voltage, and the incoming line 2 of the series-connected station 2 has voltage. After a delay, the incoming line 2 switch of the series-connected station 2 is closed; If the incoming line 1 switch of the series-connected station 3 sneaks tripping, then self-healing discharges.

13. A self-healing control method for a two-line three-station double-chain area as claimed in claim 4, characterized in that: The local incoming line backup power supply automatic switching logic includes: (1) Conditions for discharging the incoming line backup power supply automatic switching: Incoming line 1 backup power supply automatic switching method: a) The circuit breaker refuses to trip; b) A blocking incoming line backup power supply input is received; c) Manually trip or remotely trip the incoming line 2 circuit breaker; d) Incoming line 1 is under maintenance or incoming line 2 is under maintenance or bus 1 is under maintenance; e) The TWJ of incoming line 1 is abnormal or the TWJ of incoming line 2 is abnormal; f) The incoming line 1 circuit breaker is in the closed position; g) When checking that the incoming line 1 power supply is energized, the incoming line 1 voltage does not meet the requirement of having voltage for more than 15 s; h) Any one of the incoming line self-switching setting control word, or function hard pressure plate, or function soft pressure plate is withdrawn; If any one of the above conditions is met, the incoming line backup power supply automatic switching discharges; Incoming line 2 backup power supply automatic switching method: a) The circuit breaker refuses to trip; b) A blocking incoming line backup power supply input is received; c) Manually trip or remotely trip the incoming line 1 circuit breaker; d) Incoming line 1 is under maintenance or incoming line 2 is under maintenance or bus 1 is under maintenance; e) The TWJ of incoming line 1 is abnormal or the TWJ of incoming line 2 is abnormal; f) The incoming line 2 circuit breaker is in the closed position; g) When checking that the incoming line 2 power supply is energized, the incoming line 2 voltage does not meet the requirement of having voltage for more than 15 s; h) Any one of the incoming line self-switching setting control word, or function hard pressure plate, or function soft pressure plate is withdrawn; If any one of the above conditions is met, the incoming line backup power supply automatic switching discharges; (2) Conditions for charging the incoming line backup power supply automatic switching: Incoming line 1 backup power supply automatic switching method: a) The three phases of bus 1 have voltage; b) The incoming line 1 circuit breaker is in the open position; c) The incoming line 2 circuit breaker is in the closed position; d) When the closing position control word is input, the incoming line 1 circuit breaker is in the closed position after closing; e) When checking that the power supply 1 is energized, the incoming line 1 voltage meets the requirement of having voltage; f) The conditions for discharging the incoming line backup power supply automatic switching are not met; When all the above conditions are met simultaneously, after a set delay, the charging of the incoming line backup power supply automatic switching is completed; Incoming line 2 backup power supply automatic switching method: a) The three phases of bus 1 have voltage; b) The incoming line 2 circuit breaker is in the open position; c) The incoming line 1 circuit breaker is in the closed position; d) When the closing position control word is input, the incoming line 2 circuit breaker is in the closed position after closing; e) When checking that the power supply 2 is energized, the incoming line 2 voltage meets the requirement of having voltage; f) The conditions for discharging the incoming line backup power supply automatic switching are not met; When all the above conditions are met simultaneously, after a set delay, the charging of the incoming line backup power supply automatic switching is completed; (3) Action logic of the incoming line backup power supply automatic switching: Incoming line 1 backup power supply automatic switching method: After the charging of the incoming line 1 spare power supply automatic switch is completed, the voltage of bus 1 is lower than the no-voltage setting value of the bus, and the current of incoming line 2 is less than the no-current setting value of incoming line 2. When the "check incoming line 1 voltage" control word is input, the voltage of incoming line 1 is greater than the energized setting value of the power supply. When the "chain 1 series power supply self-healing priority" control word is input and the chain series power supply main wiring 1 self-heals and discharges, or when the "chain 1 series power supply self-healing priority" control word is withdrawn, after the time delay of the incoming line 1 self-switching tripping, the device reports "trip incoming line 2 circuit breaker", and the outlet trips incoming line 2 circuit breaker. If after the time delay, the incoming line 2 circuit breaker still fails to trip, the spare power supply automatic switch discharges and reports "spare power supply automatic switch tripping unsuccessful"; If it is confirmed that the incoming line 2 circuit breaker has tripped, the "trip incoming line 2 circuit breaker" command is withdrawn. After the time delay of the incoming line 1 self-switching closing, it reports "close incoming line 1 circuit breaker" and the outlet closes incoming line 1 circuit breaker. If after the time delay, the incoming line 1 circuit breaker still fails to close, the spare power supply automatic switch discharges and reports "spare power supply automatic switch closing unsuccessful"; If it is confirmed that the incoming line 1 circuit breaker is closed, it reports "spare power supply automatic switch operates and closes successfully"; Incoming line 2 spare power supply automatic switch mode: After the charging of the incoming line 2 spare power supply automatic switch is completed, the voltage of bus 1 is lower than the no-voltage setting value of the bus, and the current of incoming line 1 is less than the no-current setting value of incoming line 1. When the "check incoming line 2 voltage" control word is input, the voltage of incoming line 2 is greater than the energized setting value of the power supply. When the "chain 1 series power supply self-healing priority" control word is input and the chain series power supply main wiring 2 self-heals and discharges, or when the "chain 1 series power supply self-healing priority" control word is withdrawn, after the time delay of the incoming line 2 self-switching tripping, the device reports "trip incoming line 1 circuit breaker", and the outlet trips incoming line 1 circuit breaker. If after the time delay, the incoming line 1 circuit breaker still fails to trip, the spare power supply automatic switch discharges and reports "spare power supply automatic switch tripping unsuccessful"; If it is confirmed that the incoming line 1 circuit breaker has tripped, the "trip incoming line 1 circuit breaker" command is withdrawn. After the time delay of the incoming line 2 self-switching closing, it reports "close incoming line 2 circuit breaker" and the outlet closes incoming line 2 circuit breaker. If after the time delay, the incoming line 2 circuit breaker still fails to close, the spare power supply automatic switch discharges and reports "spare power supply automatic switch closing unsuccessful"; If it is confirmed that the incoming line 2 circuit breaker is closed, it reports "spare power supply automatic switch operates and closes successfully".

14. A two-line three-station double-chain area self-healing control method according to claim 4, characterized in that: The local sectional spare power supply automatic switch logic described in step 3 includes: (1) Local sectional spare power supply automatic switch charging conditions: a) The three phases of bus 1 are energized; b) The three phases of bus 2 are energized; c) One of the incoming line 1 and incoming line 2 switches is non-maintenance and in the closed position; c) One of the incoming line 3 and incoming line 4 switches is non-maintenance and in the closed position; d) The sectional switch is in the open position; When the above conditions are met simultaneously, after the set delay, the local sectional spare power supply automatic switch charging is completed; (2) Local sectional spare power supply automatic switch discharging conditions: a) Bus X does not meet the energized condition and discharges after the time delay. When it is sectional self-switching 1, X takes 2, and when it is sectional self-switching 2, X takes 1; b) Section switch in closed position; c) Section self - closing; d) Section switch under maintenance; e) Both incoming line 1 and incoming line 2 under maintenance; f) Both incoming line 3 and incoming line 4 under maintenance; g) Any one of the TWJs of incoming lines 1 - 4 and the section is abnormal; h) Any one of the switches of incoming lines 1 and 2 fails to trip; i) Section fails to close; j) The substation side sends a signal to lock the self - healing; k) Any one of the section self - closing setting control word, or function hard pressure plate, or function soft pressure plate is withdrawn; If any of the above conditions is met, the local section backup power supply will discharge; (3) Local section backup power supply operation logic: After the charging is completed, if bus 1 has no voltage and both incoming line 1 and incoming line 2 have no current, and bus 2 has voltage, the section backup power supply logic will be started. When the "chain 1 series - supply self - healing priority" control word is input and the chain - type series - supply main wiring 1 self - heals and discharges and the incoming line backup power supply of the chain - type series - supply main wiring 1 discharges, or when the "chain 1 series - supply self - healing priority" control word is withdrawn and the incoming line backup power supply of the chain - type series - supply main wiring 1 discharges, after the time delay of the section self - closing 1 tripping time, the incoming line 1 and incoming line 2 switches will trip; After confirming that the incoming line 1 and incoming line 2 line switches have tripped and the bus has no voltage, after the time delay of the section self - closing time, the section switch will be closed; After the charging is completed, if bus 2 has no voltage and both incoming line 3 and incoming line 4 have no current, and bus 1 has voltage, the section backup power supply logic will be started. When the "chain 1 series - supply self - healing priority" control word is input and the chain - type series - supply main wiring 1 self - heals and discharges and the incoming line backup power supply of the chain - type series - supply main wiring 1 discharges, or when the "chain 1 series - supply self - healing priority" control word is withdrawn and the incoming line backup power supply of the chain - type series - supply main wiring 1 discharges, after the time delay of the section self - closing 2 tripping time, the incoming line 3 and incoming line 4 switches will trip; After confirming that the incoming line 3 and incoming line 4 line switches have tripped and the bus has no voltage, after the time delay of the section self - closing time, the section switch will be closed.

15. A terminal, comprising a processor and a storage medium; characterized in that: The storage medium is used for storing instructions; The processor is used for operating according to the instructions to execute the steps of the method according to any one of claims 4 - 14.

16. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, the steps of the method according to any one of claims 4 - 14 are implemented.

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