Multi-bus traction substation self-healing reconstruction failure power restoration method and system

Abstract

The invention discloses a multi-bus traction substation self-healing reconstruction failure power restoration method and system, and the method comprises the steps: carrying out the self-healing reconstruction action in a substation, rejecting to open a low-voltage side circuit breaker of a bus fault power supply, blocking a corresponding switch through a GOOSE signal, presetting a switch number fixed value, and carrying out the step-by-step opening of the circuit breaker with the switch number meeting the criterion through time delay. The high-voltage side circuit breaker of the standby power supply is switched on after time delay, the low-voltage side circuit breaker of the standby power supply is switched on step by step after time delay if no locking signal exists, self-healing reconstruction action is performed in the substation, the low-voltage side circuit breaker of the bus standby power supply is rejected to be switched on, and the circuit breaker with the switch number meeting the criterion is switched on step by step after time delay. The method has the advantages that when the self-healing action fails due to the action refusing fault in the self-healing reconstruction process in the substation, the bus cannot stop power supply recovery, the power supply range can be recovered to the maximum extent, power failure of a non-fault phase bus is avoided, equipment does not need to be newly added, and the method can be achieved through an existing protection device upgrading program.

Description

Technical Field

[0001] The present invention belongs to the technical field of relay protection of electric power systems, and in particular relates to a method and system for restoring power supply after self-healing reconstruction failure of a multi-busbar traction substation. Background Art

[0002] Ideally, when an incoming line fault or transformer fault occurs, the self-healing reconstruction system in the station issues a series of instructions to trip the high and low voltage side circuit breakers of the faulty power supply, and close the high and low voltage side circuit breakers of the backup power supply in sequence to restore power to the busbar.

[0003] Problems:

[0004] Problem 1: If any circuit breaker on the low-voltage side of the faulty power source fails to trip, the self-healing and reconstruction process stops. For multi-bus substations, subsequent circuit breakers that have not failed will no longer participate in the self-healing and reconstruction action within the substation, especially the low-voltage side circuit breaker of the non-faulty phase of the backup power source will no longer automatically close, which may cause power outages on all phase buses.

[0005] Problem 2: If any of the low-voltage side circuit breakers of the backup power source fails to close, the self-healing reconstruction process stops. At this time, the high- and low-voltage side circuit breakers of the faulty power source have all been opened. If the switch number of the low-voltage side circuit breaker of the backup power source is larger than the switch number of the circuit breaker that refuses to close, it will no longer be closed. As a result, even if the subsequent switches can be closed normally to restore power to the bus, the self-healing reconstruction action is exited due to the refusal to close alarm interrupting the reconstruction process, and the bus power supply restoration range is not maximized; Summary of the invention

[0006] In order to solve the above problems, the present invention proposes a method and system for restoring power supply when self-healing reconstruction fails in a multi-bus traction substation. When a refusal to open or refusal to close fault occurs during the self-healing reconstruction process within the substation, resulting in a failure of self-healing reconstruction, the remaining low-voltage side circuit breakers can correctly execute corresponding actions to restore power supply according to the refusal signal, ensuring that only the busbar powered by the refusal switch is out of power, and the busbar power supply range can be restored to the maximum extent.

[0007] To achieve the above object, the technical solution adopted by the present invention is:

[0008] A method for restoring power supply after self-healing reconstruction failure of a multi-busbar traction substation, wherein the traction substation comprises two incoming lines as a power supply and a backup power supply respectively, and low-voltage side lines with the same number of the two incoming lines are respectively connected to corresponding buses; the method comprises:

[0009] When a power failure occurs, the faulty power source will be rebuilt by self-healing. When a refusal-to-trip alarm occurs on the low-voltage side circuit breaker of the faulty power source, the busbar circuit breaker on the low-voltage side of the backup power source will be locked. If the number of the circuit breaker on the low-voltage side of the faulty power source is greater than the number of the refusal-to-trip circuit breaker, the opening signal will be sent out step by step after the opening time delay of the low-voltage circuit breaker, otherwise it will not operate; the circuit breaker on the high-voltage side of the backup power source will be closed after the high-voltage circuit breaker time delay; if there is no refusal-to-trip signal on the low-voltage side circuit breaker of the faulty power source, the low-voltage side circuit breaker of the backup power source with the corresponding number will be closed step by step after the closing time delay of the first low-voltage circuit breaker, otherwise the low-voltage side circuit breaker of this phase of the backup power source will not operate;

[0010] The station performs self-healing reconstruction, the circuit breakers on the low-voltage side of the faulty power supply are opened, and the circuit breakers on the high-voltage side of the backup power supply are closed. When the circuit breaker on the low-voltage side of the backup power supply gives a refusal to close alarm, the circuit breakers on the low-voltage side of the backup power supply with numbers greater than the number of the circuit breaker that refuses to close are closed step by step after the closing time delay of the second low-voltage circuit breaker, otherwise no action will be taken.

[0011] The present invention further includes the following preferred embodiments.

[0012] Further, a constant value P of the number of low-voltage side circuit breakers is set, wherein P is equal to the number of low-voltage side circuit breakers of the power supply or the backup power supply;

[0013] Set the switching action time interval constant t of the low-voltage side circuit breaker.

[0014] Furthermore, the circuit breaker number on the low voltage side of the power supply and the circuit breaker number on the low voltage side of the backup power supply are set.

[0015] The power supply low-voltage side circuit breakers are numbered starting from 1 from left to right, and the backup power supply low-voltage side circuit breakers are numbered starting from 1 from left to right. The power supply low-voltage side circuit breakers and the backup power supply low-voltage side circuit breakers with the same number are connected to the same busbar of the traction substation.

[0016] Furthermore, when the low-voltage side circuit breaker of the faulty power source generates a refusal to trip alarm, the transformer protection device in the faulty power source locks the low-voltage side circuit breaker of the standby power source with the same number as the refusal to trip circuit breaker through the GOOSE signal.

[0017] Furthermore, the transformer protection device in the backup power supply station uses the GOOSE signal to determine that the low-voltage side circuit breaker on this side has no closing and locking signal and the circuit breaker with the same number on the opposite side, i.e. the power supply side, is in an open position, and then it is determined that the circuit breaker on the power supply side has no refusal to open signal.

[0018] Furthermore, the low-voltage side circuit breakers of the faulty power source with a number greater than the circuit breaker that refuses to open send out opening signals step by step after the opening time delay of the low-voltage circuit breaker.

[0019] The opening time delay of each low voltage circuit breaker is:

[0020] TFN=t×(NM),

[0021] Among them, t is the set value of the low-voltage side circuit breaker switch action time interval, N is the number of the low-voltage side circuit breaker of the faulty power supply, M is the number of the circuit breaker on the low-voltage side of the faulty power supply that sends a refusal to open alarm signal, and TFN is the opening time delay of the low-voltage side circuit breaker of the faulty power supply numbered N.

[0022] Furthermore, the high-voltage side circuit breaker of the backup power supply is automatically closed after the high-voltage circuit breaker time delay, and the high-voltage circuit breaker time delay TH is calculated according to the following formula:

[0023] TH = t × (P-M + 1),

[0024] Among them, P is a setting value of the number of circuit breakers on the low-voltage side, and M is the number of the circuit breaker refusal switch that sends a refusal alarm signal on the low-voltage side of the faulty power supply.

[0025] Furthermore, if the low-voltage side circuit breaker of the faulty power supply has no rejection signal, the low-voltage side circuit breaker of the corresponding numbered standby power supply is closed step by step after the closing time delay of the first low-voltage circuit breaker, and the closing time delay THN1 of the first low-voltage circuit breaker is calculated according to the following formula:

[0026] THN1=t×N,

[0027] THN1 is the closing time delay of the first low-voltage circuit breaker on the low-voltage side of the backup power supply numbered N, and N is the number of the circuit breaker on the low-voltage side of the backup power supply.

[0028] Further, the low-voltage side circuit breakers of the backup power supply whose circuit breaker numbers are greater than the circuit breaker numbers that refuse to close are closed step by step after the second low-voltage circuit breaker closing time delay, and the second low-voltage circuit breaker closing time delay THN2 is calculated according to the following formula:

[0029] THN2=t×(NK),

[0030] THN2 is the closing time delay of the second low-voltage circuit breaker on the low-voltage side of the backup power supply numbered N, N is the number of the circuit breaker on the low-voltage side of the backup power supply, and K is the number of the circuit breaker on the low-voltage side of the backup power supply that generates a refusal to close alarm signal.

[0031] The present application also claims protection for a multi-busbar traction substation self-healing reconstruction failure power supply recovery system using the aforementioned self-healing reconstruction failure power supply recovery method, which is characterized by:

[0032] The self-healing reconstruction failure power supply recovery system comprises a self-healing startup module, a self-healing reconstruction failure judgment and exit module, a GOOSE signal locking module, a fault power supply low-voltage side circuit breaker refusal to open alarm module, a fault power supply low-voltage side circuit breaker delay step-by-step opening control module, a backup power supply high-voltage side circuit breaker delay closing control module, a backup power supply low-voltage side circuit breaker refusal to close alarm module, and a backup power supply low-voltage side circuit breaker delay step-by-step closing control module;

[0033] The self-healing start module in the faulty power supply is used to start the self-healing reconstruction action when the power supply fails, and the low-voltage side circuit breaker failure alarm module of the faulty power supply is used to send out an alarm signal when the low-voltage side circuit breaker of the faulty power supply refuses to trip;

[0034] When the low-voltage side circuit breaker of the faulty power source refuses to trip and gives an alarm, the self-healing reconstruction failure judgment and exit module judges the self-healing reconstruction failure and exits the self-healing process, and controls the GOOSE signal locking module to lock the low-voltage side circuit breaker of the backup power source with the same number as the circuit breaker that refuses to trip;

[0035] The delay step-by-step opening control module of the circuit breaker on the low-voltage side of the fault power supply controls the low-voltage circuit breakers whose numbers are greater than the circuit breaker numbers that refuse to open to send opening signals step by step after the low-voltage circuit breaker opening time delay;

[0036] The backup power supply high-voltage side circuit breaker time-delay closing control module controls the backup power supply high-voltage side circuit breaker to close after the high-voltage circuit breaker time delay;

[0037] When the low-voltage side circuit breaker of the backup power supply refuses to close, the low-voltage side circuit breaker of the backup power supply refuses to close alarm module sends out an alarm signal;

[0038] The standby power supply low-voltage side circuit breaker delay step-by-step closing control module is used to control the standby power supply low-voltage side circuit breaker to close step by step according to the corresponding delay when the fault power supply low-voltage side circuit breaker refuses to open or the standby power supply low-voltage side circuit breaker refuses to close.

[0039] The self-healing and reconfiguration failure power supply recovery system also includes a low-voltage side circuit breaker number setting module and a low-voltage side circuit breaker switch action time interval setting module;

[0040] The low-voltage side circuit breaker number setting module sets a low-voltage side circuit breaker number setting value P, where P is equal to the number of low-voltage side circuit breakers of the power supply or backup power supply;

[0041] The low-voltage side circuit breaker switch action time interval constant module sets the low-voltage side circuit breaker switch action time interval constant t.

[0042] Further,

[0043] The self-healing reconstruction failure power supply recovery system also includes a circuit breaker number setting module;

[0044] The circuit breaker number setting module sets the circuit breaker number on the low-voltage side of the power supply from left to right starting from 1, and sets the circuit breaker number on the low-voltage side of the backup power supply from left to right starting from 1. The circuit breaker on the low-voltage side of the power supply and the circuit breaker on the low-voltage side of the backup power supply with the same number are connected to the same busbar of the traction substation.

[0045] Further,

[0046] When the low-voltage side circuit breaker of the faulty power supply generates a refusal to trip alarm, the GOOSE signal locking module locks the closing of the low-voltage side circuit breaker of the standby power supply with the same number as the refusal to trip circuit breaker.

[0047] Further,

[0048] If the transformer protection device in the backup power supply does not receive the locking signal sent by the GOOSE signal locking module, it is judged that the low-voltage side circuit breaker of the incoming line has no closing locking signal and the circuit breaker with the same number on the opposite side, i.e. the power supply side, is open, then it is judged that the circuit breaker on the power supply side has no refusal to open signal.

[0049] Further,

[0050] The fault power supply low voltage side circuit breaker delay step-by-step opening control module sends out the opening signal step-by-step after the low voltage circuit breaker opening time delay for the fault power supply low voltage side circuit breaker with a number greater than the circuit breaker that refuses to open.

[0051] The opening time delay of each low voltage circuit breaker is:

[0052] TFN=t×(NM),

[0053] Among them, t is the set value of the low-voltage side circuit breaker switch action time interval, N is the number of the low-voltage side circuit breaker of the faulty power supply, M is the number of the circuit breaker on the low-voltage side of the faulty power supply that sends a refusal to open alarm signal, and TFN is the opening time delay of the low-voltage side circuit breaker of the faulty power supply numbered N.

[0054] Further,

[0055] The backup power supply high-voltage side circuit breaker delay closing control module controls the backup power supply high-voltage side circuit breaker to automatically close after the high-voltage circuit breaker time delay. The high-voltage circuit breaker time delay TH is calculated according to the following formula:

[0056] TH = t × (P-M + 1),

[0057] Among them, P is a setting value of the number of circuit breakers on the low-voltage side, and M is the number of the circuit breaker refusal switch that sends a refusal alarm signal on the low-voltage side of the faulty power supply.

[0058] Further,

[0059] If there is no rejection signal on the low-voltage side circuit breaker of the faulty power supply, the delay step-by-step closing control module of the low-voltage side circuit breaker of the standby power supply controls the corresponding numbered low-voltage side circuit breaker to close step by step after the first low-voltage circuit breaker closing time delay. The first low-voltage circuit breaker closing time delay THN1 is calculated according to the following formula:

[0060] THN1=t×N,

[0061] THN1 is the closing time delay of the first low-voltage circuit breaker on the low-voltage side of the backup power supply numbered N, and N is the number of the circuit breaker on the low-voltage side of the backup power supply.

[0062] Further,

[0063] The standby power supply low-voltage side circuit breaker delay step-by-step closing control module controls the standby power supply low-voltage side circuit breakers whose circuit breaker numbers are greater than the circuit breaker numbers that refuse to close to close step by step after the second low-voltage circuit breaker closing time delay. The second low-voltage circuit breaker closing time delay THN2 is calculated according to the following formula:

[0064] THN2=t×(NK),

[0065] THN2 is the closing time delay of the second low-voltage circuit breaker on the low-voltage side of the backup power supply numbered N, N is the number of the circuit breaker on the low-voltage side of the backup power supply, and K is the number of the circuit breaker on the low-voltage side of the backup power supply that generates a refusal to close alarm signal.

[0066] An electronic device comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of the method for restoring power supply after self-healing reconstruction failure of a multi-bus traction substation are implemented.

[0067] This application has the following advantages:

[0068] When a refusal to open or refusal to close fault occurs during the self-healing reconstruction process within the station, resulting in the failure of the self-healing action, the bus will not stop restoring power supply. The remaining low-voltage side circuit breakers can correctly perform corresponding actions to restore power supply according to the refusal to operate signal, ensuring that only the bus supplied by the refusal to operate switch is out of power. The bus power supply range can be restored to the maximum extent, avoiding power outage of non-fault phase buses due to self-healing action failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] Figure 1 Schematic diagram of a multi-busbar traction substation.

[0070] Figure 2 The present invention is a flowchart of an embodiment of a method for restoring power supply after self-healing and reconstruction failure in a multi-bus traction substation. DETAILED DESCRIPTION

[0071] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The embodiments described in this application are only embodiments of a part of the present invention, rather than all embodiments. Based on the spirit of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the protection scope of the present invention.

[0072] The present invention discloses a method for restoring power supply after self-healing reconstruction failure of a multi-busbar traction substation. The traction substation comprises two incoming lines serving as a power supply and a backup power supply respectively. The two incoming lines have the same number of low-voltage side lines connected to corresponding busbars respectively.

[0073] When a power failure occurs, the faulty power source will be rebuilt by self-healing. When a refusal-to-trip alarm occurs on the low-voltage side circuit breaker of the faulty power source, the busbar circuit breaker on the low-voltage side of the backup power source will be locked. If the number of the circuit breaker on the low-voltage side of the faulty power source is greater than the number of the refusal-to-trip circuit breaker, the opening signal will be sent out step by step after the opening time delay of the low-voltage circuit breaker, otherwise it will not operate; the circuit breaker on the high-voltage side of the backup power source will be closed after the high-voltage circuit breaker time delay; if there is no refusal-to-trip signal on the low-voltage side circuit breaker of the faulty power source, the low-voltage side circuit breaker of the backup power source with the corresponding number will be closed step by step after the closing time delay of the first low-voltage circuit breaker, otherwise the low-voltage side circuit breaker of this phase of the backup power source will not operate;

[0074] The station performs self-healing reconstruction, the circuit breakers on the low-voltage side of the faulty power supply are opened, and the circuit breakers on the high-voltage side of the backup power supply are closed. When the circuit breaker on the low-voltage side of the backup power supply gives a refusal to close alarm, the circuit breakers on the low-voltage side of the backup power supply with numbers greater than the number of the circuit breaker that refuses to close are closed step by step after the closing time delay of the second low-voltage circuit breaker, otherwise no action will be taken.

[0075] Set the low-voltage side circuit breaker number constant P, where P is equal to the number of low-voltage side circuit breakers of the power supply or backup power supply. Set the low-voltage side circuit breaker switch action time interval constant t.

[0076] Adjust the number of the low-voltage side circuit breaker of the power supply and the low-voltage side circuit breaker of the backup power supply. Adjust the number of the low-voltage side circuit breaker of the power supply from 1 from left to right, and adjust the number of the low-voltage side circuit breaker of the backup power supply from 1 from left to right. The low-voltage side circuit breaker of the power supply and the low-voltage side circuit breaker of the backup power supply with the same number are connected to the same busbar of the traction substation.

[0077] When the low-voltage side circuit breaker of the faulty power source generates a refusal alarm, the transformer protection device in the faulty power source locks the low-voltage side circuit breaker of the backup power source with the same number as the refusal circuit breaker through the GOOSE signal. The transformer protection device in the backup power source uses the GOOSE signal to determine that the low-voltage side circuit breaker on the incoming line has no closing lock signal and the circuit breaker with the same number on the opposite side, i.e., the power source side, is open, and then it is determined that the power source side circuit breaker has no refusal signal.

[0078] In the spirit of the above invention, those skilled in the art will clearly understand that the low-voltage circuit breaker opening time delay can be set in a step-by-step increasing manner as needed; the high-voltage circuit breaker closing time delay can be set as needed; and the first low-voltage circuit breaker closing time delay and the second low-voltage circuit breaker closing time delay can be set in a step-by-step increasing manner.

[0079] In a preferred embodiment of the present invention, the low voltage circuit breaker opening time delay, the high voltage circuit breaker closing time delay, the first low voltage circuit breaker closing time delay and the second low voltage circuit breaker closing time delay are calculated in the following manner. However, it should be noted that this preferred embodiment is only for obtaining a better technical effect and is not intended to limit the spirit of the present invention.

[0080] The low-voltage side circuit breaker of the fault power source with a number greater than the circuit breaker number that refuses to open sends out the opening signal step by step after the low-voltage circuit breaker opening time delay.

[0081] The opening time delay of each low voltage circuit breaker is:

[0082] TFN=t×(NM),

[0083] Among them, t is the set value of the low-voltage side circuit breaker switch action time interval, N is the number of the low-voltage side circuit breaker of the faulty power supply, M is the number of the circuit breaker on the low-voltage side of the faulty power supply that sends a refusal to open alarm signal, and TFN is the opening time delay of the low-voltage side circuit breaker of the faulty power supply numbered N.

[0084] The high-voltage side circuit breaker of the backup power supply automatically closes after the high-voltage circuit breaker time delay. The high-voltage circuit breaker time delay TH is calculated according to the following formula:

[0085] TH = t × (P-M + 1),

[0086] Among them, P is a setting value of the number of circuit breakers on the low-voltage side, and M is the number of the circuit breaker refusal switch that sends a refusal alarm signal on the low-voltage side of the faulty power supply.

[0087] If there is no rejection signal on the low-voltage side circuit breaker of the faulty power supply, the low-voltage side circuit breaker of the corresponding numbered standby power supply is closed step by step after the closing time delay of the first low-voltage circuit breaker. The closing time delay THN1 of the first low-voltage circuit breaker is calculated according to the following formula:

[0088] THN1=t×N,

[0089] THN1 is the closing time delay of the first low-voltage circuit breaker on the low-voltage side of the backup power supply numbered N, and N is the number of the circuit breaker on the low-voltage side of the backup power supply.

[0090] The low-voltage side circuit breakers of the backup power supply whose circuit breaker numbers are greater than the circuit breaker numbers that refuse to close are closed step by step after the closing time delay of the second low-voltage circuit breaker. The closing time delay THN2 of the second low-voltage circuit breaker is calculated according to the following formula:

[0091] THN2=t×(NK),

[0092] THN2 is the closing time delay of the second low-voltage circuit breaker on the low-voltage side of the backup power supply numbered N, N is the number of the circuit breaker on the low-voltage side of the backup power supply, and K is the number of the circuit breaker on the low-voltage side of the backup power supply that generates a refusal to close alarm signal.

[0093] The present application also discloses a multi-busbar traction substation self-healing reconstruction failure power supply recovery system using the aforementioned self-healing reconstruction failure power supply recovery method.

[0094] The self-healing reconstruction failure power supply recovery system comprises a self-healing startup module, a self-healing reconstruction failure judgment and exit module, a GOOSE signal locking module, a fault power supply low-voltage side circuit breaker refusal to open alarm module, a fault power supply low-voltage side circuit breaker delay step-by-step opening control module, a backup power supply high-voltage side circuit breaker delay closing control module, a backup power supply low-voltage side circuit breaker refusal to close alarm module, and a backup power supply low-voltage side circuit breaker delay step-by-step closing control module;

[0095] The self-healing start module in the faulty power supply is used to start the self-healing reconstruction action when the power supply fails, and the low-voltage side circuit breaker failure alarm module of the faulty power supply is used to send out an alarm signal when the low-voltage side circuit breaker of the faulty power supply refuses to trip;

[0096] When the low-voltage side circuit breaker of the faulty power source refuses to trip and gives an alarm, the self-healing reconstruction failure judgment and exit module judges the self-healing reconstruction failure and exits the self-healing process, and controls the GOOSE signal locking module to lock the low-voltage side circuit breaker of the backup power source with the same number as the circuit breaker that refuses to trip;

[0097] The delay step-by-step opening control module of the circuit breaker on the low-voltage side of the fault power supply controls the low-voltage circuit breakers whose numbers are greater than the circuit breaker numbers that refuse to open to send opening signals step by step after the low-voltage circuit breaker opening time delay;

[0098] The backup power supply high-voltage side circuit breaker time-delay closing control module controls the backup power supply high-voltage side circuit breaker to close after the high-voltage circuit breaker time delay;

[0099] When the low-voltage side circuit breaker of the backup power supply refuses to close, the low-voltage side circuit breaker of the backup power supply refuses to close alarm module sends out an alarm signal;

[0100] The standby power supply low-voltage side circuit breaker delayed step-by-step closing control module is used to control the standby power supply low-voltage side circuit breaker to close step by step according to the corresponding delay when the fault power supply low-voltage side circuit breaker refuses to open or the standby power supply low-voltage side circuit breaker refuses to close.

[0101] The self-healing and reconfiguration failure power supply recovery system also includes a low-voltage side circuit breaker number setting module and a low-voltage side circuit breaker switch action time interval setting module;

[0102] The low-voltage side circuit breaker number setting module sets a low-voltage side circuit breaker number setting value P, where P is equal to the number of low-voltage side circuit breakers of the power supply or backup power supply;

[0103] The low-voltage side circuit breaker switch action time interval constant module sets the low-voltage side circuit breaker switch action time interval constant t.

[0104] The self-healing reconstruction failure power supply recovery system also includes a circuit breaker number setting module;

[0105] The circuit breaker number setting module sets the circuit breaker number on the low-voltage side of the power supply from left to right starting from 1, and sets the circuit breaker number on the low-voltage side of the backup power supply from left to right starting from 1. The circuit breaker on the low-voltage side of the power supply and the circuit breaker on the low-voltage side of the backup power supply with the same number are connected to the same busbar of the traction substation.

[0106] When the low-voltage side circuit breaker of the faulty power supply generates a refusal alarm, the GOOSE signal blocking module blocks the closing of the low-voltage side circuit breaker of the backup power supply with the same number as the refusal circuit breaker. If the transformer protection device in the backup power supply does not receive the blocking signal sent by the GOOSE signal blocking module, it is determined that the low-voltage side circuit breaker of the incoming line on this side has no closing blocking signal and the circuit breaker with the same number on the opposite side, i.e., the power supply side, is open, then the power supply side circuit breaker is judged to have no refusal signal.

[0107] In a preferred implementation of the multi-bus traction substation self-healing reconstruction failure power supply recovery system, the method of calculating the low-voltage circuit breaker opening time delay, the high-voltage circuit breaker closing time delay, the first low-voltage circuit breaker closing time delay and the second low-voltage circuit breaker closing time delay is the same as the multi-bus traction substation self-healing reconstruction failure power supply recovery method, and will not be repeated here.

[0108] The following is combined with Figure 1 and attached Figure 2 To further describe the present invention, the present invention only uses the No. 1 incoming line as a fault power supply to explain the implementation process. Since the No. 1 incoming line and the No. 2 incoming line have the same main wiring and are in a standby relationship with each other, the implementation process of the No. 2 incoming line as a fault power supply is not described in detail in this invention. The following implementation cases are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0109] Implementation Cases

[0110] like Figure 1As shown, in normal operation, incoming line 1BQF, 1B.1 to 1B.5 of No. 1 are closed to supply power to bus AE, and incoming line 2BQF, 2B.1 to 2B.5 of No. 2 are opened to serve as backup power supply for bus. Set the switch action time interval t to 0.1s, the low-voltage side switch number P to 5, the switch numbers of 1B.1 to 1B.5 are set to 1 to 5 in sequence, and the switch numbers of 2B.1 to 2B.5 are set to 1 to 5 in sequence.

[0111] Case 1: No. 1 incoming power supply fails, 1B.1 refuses to send alarm

[0112] The No. 1 incoming power supply fails, the self-healing in station 1B starts, the 1B.1 circuit breaker refuses to open and sounds an alarm, the station's self-healing reconstruction fails and exits the self-healing process, and the 1B protection device uses the GOOSE signal to lock 2B.1. The switch numbers of 1B.2 to 1B.5 are greater than 1B.1, so the opening signal is issued after TFN=0.1×(N-1), that is, 1B.2 to 1B.5 open after 0.1s, 0.2s, 0.3s, and 0.4s respectively. 2BQF is closed after TH=t×(P-M+1), i.e. 0.1×(5-1+1)=0.5s. 2B.1 does not respond due to the GOOSE blocking closing signal sent by the 1B protection device. 2B.2 to 2B.5 are closed after THN1=t×N after 2BQF is closed, i.e. 2B.2 to 2B.5 are closed after 0.2s, 0.3s, 0.4s and 0.5s respectively. Bus BE resumes power supply and only bus A is cut off.

[0113] Case 2: No. 1 incoming power supply fails, 1B.5 refuses to send alarm

[0114] The No. 1 incoming power supply fails, the self-healing in station 1B starts, 1B.1 to 1B.4 are successfully opened, 1B.5 circuit breaker refuses to open and alarms, the station self-healing reconstruction fails and exits the self-healing process, the 1B protection device uses the GOOSE signal to lock 2B.5 closing, 1B.1 to 1B.4 switch numbers are less than 1B.5, which means they have been successfully opened, so they do not operate, 2BQF closes after TH=t×(P-M+1), that is, 0.1×(5-5+1)=0.1s, 2B.5 does not operate due to the GOOSE locking closing signal issued by the 1B protection device, 2B.1 to 2B.4 close after THN1=t×N after 2BQF is closed, that is, 2B.1 to 2B.4 are closed after 0.1s, 0.2s, 0.3s, and 0.4s respectively, and bus AD resumes power supply, and only bus E is out of power.

[0115] Case 3: No. 1 incoming power supply fails, 2B.1 refuses to close alarm

[0116] The No. 1 incoming power supply fails, the self-healing in station 1B is started, 1B.1 to 1B.5 are successfully opened, 2BQF is successfully closed, 2B.1 refuses to close and an alarm is sounded, the station's self-healing reconstruction fails and the self-healing process is exited. The switch numbers of 2B.2 to 2B.5 are greater than 2B.1, so they are closed in sequence after THN2=0.1×(NM), that is, 2B.2 to 2B.5 are closed in sequence after 0.1s, 0.2s, 0.3s, and 0.4s, and bus BE resumes power supply, leaving only bus A out of power.

[0117] Case 4: No. 1 incoming power supply fails, 2B.4 refuses to close alarm

[0118] The No. 1 incoming power supply fails, and the self-healing in station 1B is started. 1B.1 to 1B.5 are successfully opened. 2BQF, 2B.1 to 2B.3 are successfully closed. 2B.4 refuses to close and issues an alarm. The station's self-healing reconstruction fails and exits the self-healing process. The switch numbers of 2B.1 to 2B.3 are less than 2B.4, which means they have been successfully closed, so they do not operate. 2B.5 is closed after THN2=0.1×(NM), that is, 0.1×(5-4)=0.1s. Bus AC and E resume power supply, and only bus D is out of power.

[0119] The present disclosure may also be a system, a method and / or a computer program product. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for causing a processor to implement various aspects of the present disclosure.

[0120] A computer-readable storage medium may be a tangible device that can hold and store instructions used by an instruction execution device. A 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 of computer-readable storage media (a non-exhaustive list) 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 disk read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanical encoding device, such as a punch card or a raised structure in a groove on which instructions are stored, and any suitable combination of the foregoing. As used herein, a computer-readable storage medium is not to be interpreted as a transient 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 a fiber optic cable), or an electrical signal transmitted through a wire.

[0121] The computer-readable program instructions described herein can be downloaded from a computer-readable storage medium to each computing / processing device, or downloaded to an external computer or 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 can include copper transmission cables, optical fiber transmissions, wireless transmissions, routers, firewalls, switches, gateway computers, and / or edge servers. The 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 the computer-readable storage medium in each computing / processing device.

[0122] The computer program instructions for performing the operation 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 "C" language or similar programming languages. Computer-readable program instructions may be executed completely on a user's computer, partially on a user's computer, as an independent software package, partially on a user's computer, partially on a remote computer, or completely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., using an Internet service provider to connect via the Internet). In some embodiments, an electronic circuit, such as a programmable logic circuit, a field programmable gate array (FPGA), or a programmable logic array (PLA), may be customized by utilizing the state information of the computer-readable program instructions, and the electronic circuit may execute the computer-readable program instructions, thereby realizing various aspects of the present disclosure.

[0123] The technical solution of the present invention can achieve the following beneficial effects:

[0124] 1. When a refusal to open or refusal to close fault occurs during the self-healing reconstruction process, causing the self-healing action to fail, the busbar will not stop restoring power supply;

[0125] 2. It can ensure that only the busbar powered by the refusal switch is powered off, and the busbar power supply range can be restored to the maximum extent;

[0126] 3. The present invention does not require new equipment and can be implemented by upgrading the program of the existing protection device.

[0127] The above describes the basic principles, main features and advantages of this patent. The technicians in this industry should understand that this patent is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of this patent. Without departing from the spirit and scope of this patent, this patent will have various changes and improvements, which fall within the scope of this patent. The scope of protection required by this patent is defined by the attached claims and their equivalents.

Claims

1. A method for restoring power supply after self-healing reconstruction failure in a multi-busbar traction substation, wherein the traction substation comprises two incoming lines as a power supply and a backup power supply respectively, and the low-voltage side lines with the same number of the two incoming lines are respectively connected to the corresponding busbars; characterized in that: The method comprises: When a power failure occurs, the faulty power source will be rebuilt by self-healing. When a refusal-to-trip alarm occurs on the low-voltage side circuit breaker of the faulty power source, the busbar circuit breaker on the low-voltage side of the backup power source will be locked. If the number of the circuit breaker on the low-voltage side of the faulty power source is greater than the number of the refusal-to-trip circuit breaker, the opening signal will be sent out step by step after the opening time delay of the low-voltage circuit breaker, otherwise it will not operate; the circuit breaker on the high-voltage side of the backup power source will be closed after the high-voltage circuit breaker time delay; if there is no refusal-to-trip signal on the low-voltage side circuit breaker of the faulty power source, the low-voltage side circuit breaker of the backup power source with the corresponding number will be closed step by step after the closing time delay of the first low-voltage circuit breaker, otherwise the low-voltage side circuit breaker of this phase of the backup power source will not operate; The station performs self-healing reconstruction, the circuit breakers on the low-voltage side of the faulty power supply are opened, and the circuit breakers on the high-voltage side of the backup power supply are closed. When the circuit breaker on the low-voltage side of the backup power supply gives a refusal to close alarm, the circuit breakers on the low-voltage side of the backup power supply with numbers greater than the number of the circuit breaker that refuses to close are closed step by step after the closing time delay of the second low-voltage circuit breaker, otherwise no action will be taken.

2. According to claim 1, the method for restoring power supply after self-healing and reconstruction failure of a multi-busbar traction substation is characterized by: Setting a constant value P of the number of circuit breakers on the low voltage side, where P is equal to the number of circuit breakers on the low voltage side of the power supply or the backup power supply; Set the switching action time interval constant t of the low-voltage side circuit breaker.

3. The method for restoring power supply after self-healing and reconfiguration failure of a multi-busbar traction substation according to claim 2 is characterized in that: The circuit breaker number on the low voltage side of the set power supply and the circuit breaker number on the low voltage side of the standby power supply, The power supply low-voltage side circuit breakers are numbered starting from 1 from left to right, and the backup power supply low-voltage side circuit breakers are numbered starting from 1 from left to right. The power supply low-voltage side circuit breakers and the backup power supply low-voltage side circuit breakers with the same number are connected to the same busbar of the traction substation.

4. The method for restoring power supply after self-healing and reconstruction failure of a multi-busbar traction substation according to claim 1 or 3 is characterized in that: When the low-voltage side circuit breaker of the faulty power source gives a refusal to trip alarm, the transformer protection device in the faulty power source locks the low-voltage side circuit breaker of the standby power source with the same number as the refusal to trip circuit breaker through the GOOSE signal.

5. The method for restoring power supply after self-healing and reconfiguration failure of a multi-busbar traction substation according to claim 4 is characterized in that: The transformer protection device in the backup power supply station uses the GOOSE signal to determine that the low-voltage side circuit breaker on this side has no closing and locking signal and the circuit breaker with the same number on the opposite side, i.e. the power supply side, is in an open position, then it is determined that the circuit breaker on the power supply side has no refusal to open signal.

6. The method for restoring power supply after self-healing and reconfiguration failure of a multi-busbar traction substation according to claim 1 or 3 is characterized in that: The low-voltage side circuit breaker of the fault power source with a number greater than the circuit breaker number that refuses to open sends out the opening signal step by step after the low-voltage circuit breaker opening time delay. The opening time delay of each low voltage circuit breaker is: TFN=t×(NM), Among them, t is the set value of the low-voltage side circuit breaker switch action time interval, N is the number of the low-voltage side circuit breaker of the faulty power supply, M is the number of the circuit breaker on the low-voltage side of the faulty power supply that sends a refusal to open alarm signal, and TFN is the opening time delay of the low-voltage side circuit breaker of the faulty power supply numbered N.

7. The method for restoring power supply after self-healing and reconfiguration failure of a multi-busbar traction substation according to claim 6 is characterized in that: The high-voltage side circuit breaker of the backup power supply automatically closes after the high-voltage circuit breaker time delay. The high-voltage circuit breaker time delay TH is calculated according to the following formula: TH = t × (P-M + 1), Among them, P is a setting value of the number of circuit breakers on the low-voltage side, and M is the number of the circuit breaker refusal switch that sends a refusal alarm signal on the low-voltage side of the faulty power supply.

8. The method for restoring power supply after self-healing and reconfiguration failure of a multi-busbar traction substation according to claim 7 is characterized in that: If there is no rejection signal on the low-voltage side circuit breaker of the faulty power supply, the low-voltage side circuit breaker of the corresponding numbered standby power supply is closed step by step after the closing time delay of the first low-voltage circuit breaker. The closing time delay THN1 of the first low-voltage circuit breaker is calculated according to the following formula: THN1=t×N, THN1 is the closing time delay of the first low-voltage circuit breaker on the low-voltage side of the backup power supply numbered N, and N is the number of the circuit breaker on the low-voltage side of the backup power supply.

9. The method for restoring power supply after self-healing and reconfiguration failure of a multi-busbar traction substation according to claim 8 is characterized in that: The low-voltage side circuit breakers of the backup power supply whose circuit breaker numbers are greater than the circuit breaker numbers that refuse to close are closed step by step after the closing time delay of the second low-voltage circuit breaker. The closing time delay THN2 of the second low-voltage circuit breaker is calculated according to the following formula: THN2=t×(NK), THN2 is the closing time delay of the second low-voltage circuit breaker on the low-voltage side of the backup power supply numbered N, N is the number of the circuit breaker on the low-voltage side of the backup power supply, and K is the number of the circuit breaker on the low-voltage side of the backup power supply that generates a refusal to close alarm signal.

10. A multi-busbar traction substation self-healing and reconfiguration failure power supply recovery system using the self-healing and reconfiguration failure power supply recovery method according to any one of claims 1 to 9, characterized in that: The self-healing and reconstruction failure recovery power supply system comprises a self-healing startup module, a self-healing and reconstruction failure judgment and exit module, a GOOSE signal locking module, a fault power supply low-voltage side circuit breaker refusal to open alarm module, a fault power supply low-voltage side circuit breaker delay step-by-step opening control module, a backup power supply high-voltage side circuit breaker delay closing control module, a backup power supply low-voltage side circuit breaker refusal to close alarm module, and a backup power supply low-voltage side circuit breaker delay step-by-step closing control module; The self-healing start module in the faulty power supply is used to start the self-healing reconstruction action when the power supply fails, and the low-voltage side circuit breaker failure alarm module of the faulty power supply is used to send out an alarm signal when the low-voltage side circuit breaker of the faulty power supply refuses to trip; When the low-voltage side circuit breaker of the faulty power source refuses to trip and gives an alarm, the self-healing reconstruction failure judgment and exit module judges the self-healing reconstruction failure and exits the self-healing process, and controls the GOOSE signal locking module to lock the low-voltage side circuit breaker of the backup power source with the same number as the circuit breaker that refuses to trip; The delay step-by-step opening control module of the circuit breaker on the low-voltage side of the fault power supply controls the low-voltage circuit breakers whose numbers are greater than the circuit breaker numbers that refuse to open to send opening signals step by step after the low-voltage circuit breaker opening time delay; The backup power supply high-voltage side circuit breaker time delay closing control module controls the backup power supply high-voltage side circuit breaker to close after the high-voltage circuit breaker time delay; When the low-voltage side circuit breaker of the backup power supply refuses to close, the low-voltage side circuit breaker of the backup power supply refuses to close alarm module sends out an alarm signal; The standby power supply low-voltage side circuit breaker delayed step-by-step closing control module is used to control the standby power supply low-voltage side circuit breaker to close step by step according to the corresponding delay when the fault power supply low-voltage side circuit breaker refuses to open or the standby power supply low-voltage side circuit breaker refuses to close.

11. The multi-busbar traction substation self-healing reconstruction failure power supply recovery system according to claim 10, characterized in that: The self-healing and reconfiguration failure power supply recovery system also includes a low-voltage side circuit breaker number setting module and a low-voltage side circuit breaker switch action time interval setting module; The low-voltage side circuit breaker number setting module sets a low-voltage side circuit breaker number setting value P, where P is equal to the number of low-voltage side circuit breakers of the power supply or backup power supply; The low-voltage side circuit breaker switch action time interval constant module sets the low-voltage side circuit breaker switch action time interval constant t.

12. The multi-busbar traction substation self-healing reconstruction failure power supply recovery system according to claim 11, characterized in that: The self-healing reconstruction failure power supply recovery system also includes a circuit breaker number setting module; The circuit breaker number setting module sets the circuit breaker number on the low-voltage side of the power supply from left to right starting from 1, and sets the circuit breaker number on the low-voltage side of the backup power supply from left to right starting from 1. The circuit breaker on the low-voltage side of the power supply and the circuit breaker on the low-voltage side of the backup power supply with the same number are connected to the same busbar of the traction substation.

13. The multi-busbar traction substation self-healing reconstruction failure power supply recovery system according to claim 12, characterized in that: When the low-voltage side circuit breaker of the faulty power supply generates a refusal to trip alarm, the GOOSE signal locking module locks the closing of the low-voltage side circuit breaker of the standby power supply with the same number as the refusal to trip circuit breaker.

14. The multi-busbar traction substation self-healing reconstruction failure power supply recovery system according to claim 13, characterized in that: If the transformer protection device in the backup power supply does not receive the locking signal sent by the GOOSE signal locking module, it is judged that the low-voltage side circuit breaker of the incoming line has no closing locking signal and the circuit breaker with the same number on the opposite side, i.e. the power supply side, is open, then it is judged that the circuit breaker on the power supply side has no refusal to open signal.

15. The multi-busbar traction substation self-healing reconstruction failure power supply recovery system according to claim 14, characterized in that: The fault power supply low voltage side circuit breaker delay step-by-step opening control module sends out the opening signal step-by-step after the low voltage circuit breaker opening time delay for the fault power supply low voltage side circuit breaker with a number greater than the circuit breaker that refuses to open. The opening time delay of each low voltage circuit breaker is: TFN=t×(NM), Among them, t is the set value of the low-voltage side circuit breaker switch action time interval, N is the number of the low-voltage side circuit breaker of the faulty power supply, M is the number of the circuit breaker on the low-voltage side of the faulty power supply that sends a refusal to open alarm signal, and TFN is the opening time delay of the low-voltage side circuit breaker of the faulty power supply numbered N.

16. The multi-busbar traction substation self-healing reconstruction failure power supply recovery system according to claim 15, characterized in that: The backup power supply high-voltage side circuit breaker delay closing control module controls the backup power supply high-voltage side circuit breaker to automatically close after the high-voltage circuit breaker time delay. The high-voltage circuit breaker time delay TH is calculated according to the following formula: TH = t × (P-M + 1), Among them, P is a setting value of the number of circuit breakers on the low-voltage side, and M is the number of the circuit breaker refusal switch that sends a refusal alarm signal on the low-voltage side of the faulty power supply.

17. The multi-busbar traction substation self-healing reconstruction failure power supply recovery system according to claim 16, characterized in that: If there is no rejection signal on the low-voltage side circuit breaker of the faulty power supply, the delay step-by-step closing control module of the low-voltage side circuit breaker of the standby power supply controls the corresponding numbered low-voltage side circuit breaker to close step by step after the first low-voltage circuit breaker closing time delay. The first low-voltage circuit breaker closing time delay THN1 is calculated according to the following formula: THN1=t×N, THN1 is the closing time delay of the first low-voltage circuit breaker on the low-voltage side of the backup power supply numbered N, and N is the number of the circuit breaker on the low-voltage side of the backup power supply.

18. The multi-busbar traction substation self-healing reconstruction failure power supply recovery system according to claim 17, characterized in that: The standby power supply low-voltage side circuit breaker delay step-by-step closing control module controls the standby power supply low-voltage side circuit breakers whose circuit breaker numbers are greater than the circuit breaker numbers that refuse to close to close step by step after the second low-voltage circuit breaker closing time delay. The second low-voltage circuit breaker closing time delay THN2 is calculated according to the following formula: THN2=t×(NK), THN2 is the closing time delay of the second low-voltage circuit breaker on the low-voltage side of the backup power supply numbered N, N is the number of the circuit breaker on the low-voltage side of the backup power supply, and K is the number of the circuit breaker on the low-voltage side of the backup power supply that generates a refusal to close alarm signal.

19. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to claim 1 to claim 9 are implemented.

20. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to claim 1 to claim 9 are implemented.

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