CN112751323B - Direct current breaker control method and direct current breaker - Google Patents
Direct current breaker control method and direct current breaker Download PDFInfo
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- CN112751323B CN112751323B CN201911050581.9A CN201911050581A CN112751323B CN 112751323 B CN112751323 B CN 112751323B CN 201911050581 A CN201911050581 A CN 201911050581A CN 112751323 B CN112751323 B CN 112751323B
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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Abstract
The method starts counting the first time length while controlling the solid-state switch circuit to be in a state corresponding to the first control instruction according to the obtained first control instruction, and if the second control instruction is received before the first time length reaches a first preset time length threshold value, the solid-state switch circuit is controlled to be in a state corresponding to the second control instruction in response to the second control instruction, and after that, a vacuum contactor connected in series with the solid-state switch circuit is disconnected or a quick switch is closed, so that the disconnection operation and the switching operation of the direct-current switch are completed. Because the solid-state switch circuit is built based on the power electronic device, the time for switching off or switching on is very short, and the response speed to the second control instruction can be further improved.
Description
Technical Field
The invention relates to the technical field of power supply, in particular to a direct current breaker control method and a direct current breaker.
Background
The direct current circuit breaker is extremely important switching equipment in a direct current power supply system, and is mainly used for breaking fault current in a power supply line and bearing rated working current when the power supply system is normal. The hybrid dc circuit breaker is the most widely used dc circuit breaker at present, and mainly comprises a mechanical fast switch, a solid-state switching circuit realized based on power electronics, and the like.
In practical application, the timeliness of the response of the hybrid direct current breaker to the control instruction, particularly the breaking instruction is particularly important. However, the existing control method of the direct current breaker is still not ideal for the response speed of the control command. For example, in the process that the direct current breaker receives a closing instruction and executes the closing operation, if the direct current breaker receives a breaking instruction, the direct current breaker cannot respond to the breaking instruction, and only after the current closing operation is executed, the breaking instruction can be responded. Obviously, the control method in the prior art cannot meet the requirement of timely responding to the control instruction.
Disclosure of Invention
The invention provides a direct current breaker control method and a direct current breaker, which can respond to control instructions more timely and meet the requirements of practical application.
In order to achieve the above purpose, the technical scheme provided by the application is as follows:
in a first aspect, the present invention provides a dc breaker control method, applied to a controller in a dc breaker, the method comprising:
acquiring a first control instruction, wherein the first control instruction comprises a brake opening instruction or a brake closing instruction;
responding to the first control instruction, controlling the solid-state switching circuit to be in a state corresponding to the first control instruction, and starting to count a first time length;
if a second control instruction is received before the first time length reaches a first preset time length threshold value, responding to the second control instruction, and controlling the solid-state switching circuit to be in a state corresponding to the second control instruction; the first control instruction is the opening instruction, the second control instruction is the closing instruction, and the second control instruction is the opening instruction;
breaking a vacuum contactor or closing a fast switch in series with the solid state switching circuit.
Optionally, the method for controlling a dc breaker provided in the first aspect of the present invention further includes:
counting the time length of the solid-state switching circuit in a state corresponding to the second control instruction to obtain a second time length;
and if the first control instruction is received before the second time length reaches a second preset time length threshold value, returning to the response of the first control instruction, controlling the solid-state switching circuit to be in a state corresponding to the first control instruction, and starting counting the first time length.
Optionally, if the second control instruction is not received before the first duration reaches the first preset duration threshold, executing the step of breaking the vacuum contactor connected in series with the solid-state switch circuit or closing the fast switch.
Optionally, if the first control instruction is the opening instruction, the controlling the solid-state switch circuit is in a state corresponding to the first control instruction, including:
acquiring the switching state information of the quick switch;
if the switch state information indicates that the quick switch is at a closing position, controlling the quick switch to be disconnected, and starting counting a third duration;
if the third time length reaches a third preset time length threshold value, controlling the solid-state switching circuit and the magnetic coupling device to be conducted, and starting to count a fourth time length;
and if the fourth time length reaches a fourth preset time length threshold value, controlling the solid-state switching circuit to be turned off.
Optionally, the method for controlling a dc breaker provided in the first aspect of the present invention further includes:
and if the switch state information indicates that the fast switch is at the opening position, executing the step of controlling the solid-state switch circuit to be turned off.
Optionally, the process of controlling the conduction of the magnetic coupling device includes:
acquiring the current direction;
determining a target thyristor corresponding to the current direction in the magnetic coupling device;
and controlling the target thyristor to be conducted.
Optionally, if the first control instruction is the closing instruction, the controlling the solid-state switch circuit is in a state corresponding to the first control instruction, including:
acquiring contactor state information of the vacuum contactor;
if the contactor state information indicates that the vacuum contactor is at a switching-off position, controlling the vacuum contactor to be closed, and starting to count a fifth time period;
and if the fifth time length reaches a fifth preset time length threshold value, controlling the solid-state switch circuit to be conducted.
Optionally, the method for controlling a dc breaker provided in the first aspect of the present invention further includes:
and if the contactor state information indicates that the vacuum contactor is at a closing position, executing the step of controlling the solid-state switch circuit to be conducted.
In a second aspect, the present invention provides a dc circuit breaker comprising: at least one fast switch, at least one solid state switching circuit, a magnetic coupling, a vacuum contactor, and a controller, wherein,
each rapid switch is sequentially connected in series to form a main current branch;
each solid-state switching circuit, the magnetic coupling device and the vacuum contactor are sequentially connected in series to form a transfer current branch;
the main current branch is connected with the transfer current branch in parallel;
the controller is respectively connected with the fast switch, the solid-state switch circuit, the magnetic coupling device and the control end of the vacuum contactor, and is used for executing the direct current breaker control method according to any one of the first aspect of the invention.
According to the control method of the direct current breaker, the solid-state switch circuit is controlled to be in a state corresponding to the first control instruction according to the obtained first control instruction, the first time length is counted, if the second control instruction is received before the first time length reaches the first preset time length threshold value, the solid-state switch circuit is controlled to be in a state corresponding to the second control instruction in response to the second control instruction, and after that, a vacuum contactor connected in series with the solid-state switch circuit is disconnected or a quick switch is closed, so that the disconnection operation and the switching-on operation of the direct current breaker are completed.
By the direct current breaker control method provided by the invention, the waiting time with the duration being the first preset duration threshold value is set, and the second control instruction possibly obtained is responded through the waiting time, so that the continuous execution of the first control instruction is avoided, and the time is reserved for timely responding to the second control instruction; if the direct current breaker receives the second control instruction within the waiting time, the state of the solid state switching circuit is changed, the state of the branch circuit of the direct current breaker is adjusted through the solid state switching circuit, and the solid state switching circuit is built based on the power electronic device, so that the opening or closing time of the solid state switching circuit is very short, the response speed to the second control instruction can be further improved, and the timeliness of responding to the control instruction can be remarkably improved, and the requirements of practical application are met.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are necessary for the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention and that other drawings may be obtained from them without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a control method of a dc breaker according to an embodiment of the present invention;
fig. 2 is a flowchart of another control method of a dc breaker according to an embodiment of the present invention;
FIG. 3 is a topological structure diagram of a prior art magnetic coupling apparatus;
fig. 4 is a topology structure diagram of a dc breaker according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
Referring to fig. 1, fig. 1 is a flowchart of a dc breaker control method according to an embodiment of the present invention, where the method may be applied to a controller in a dc breaker, and obviously, the controller may also be implemented by a server on a network side or other controllers independent of the dc breaker in some cases; referring to fig. 1, a control method of a dc breaker according to an embodiment of the present invention may include:
step S100, a first control instruction is acquired.
The first control instruction in the direct current breaker control method provided by the embodiment of the invention can be a switching-off instruction or a switching-on instruction. It is conceivable that in practical application, the controller arranged in the direct current breaker can only receive one of the switching-off command and the switching-on command at the same time, and the situation that the switching-on command and the switching-off command are received simultaneously does not exist.
Optionally, the first control command may be sent by a control protection device in a line where the dc breaker is located, and of course, may also be sent by other control devices.
In step S101, in response to the first control instruction, the solid-state switching circuit is controlled to be in a state corresponding to the first control instruction, and the first time period starts to be counted.
After receiving the first control instruction, the solid-state switch circuit can be controlled to be in a state corresponding to the first control instruction according to the first control instruction. Specifically, if the first control command is a switching-off command, the solid-state switching circuit will be in an off state eventually, and if the first control command is a switching-on command, the solid-state switching circuit will be in an on state eventually. The specific control process will be described in detail below, and will not be described in detail here.
While the solid state switching circuit is controlled to be in a state corresponding to the first control instruction, the first time period starts to be counted, i.e., the duration of time that the solid state switching circuit is in a state corresponding to the first control instruction.
Step S102, judging whether a second control instruction is received before the first time length reaches a first preset time length threshold value, if yes, executing step S103; if not, go to step S106.
If the controller receives the second control instruction before the first time reaches the first preset time threshold, the step S103 is executed, and the received second control instruction is responded; in contrast, if the second control instruction is not received before the first time period reaches the first preset time period threshold, the subsequent step of executing the first control instruction is continued, that is, step S106 is executed.
In the embodiment of the invention, in the process of receiving and executing the first control instruction, the waiting time with the reserved time length being the first preset time length threshold value waits for the protection and control device to send the second control instruction, so that the response to the second control instruction possibly received can be ensured in time.
It should be noted that, as described above, the control instruction that can be received by the dc breaker controller applying the dc breaker control method provided by the embodiment of the present invention includes two types of closing instructions and opening instructions, so if the first control instruction is a closing instruction, the second control instruction is an opening instruction; correspondingly, if the first control command is a switching-off command, the second control command is a switching-on command.
Step S103, in response to the second control instruction, controlling the solid-state switching circuit to be in a state corresponding to the second control instruction.
And if the controller receives the second control instruction in the waiting time with the duration of the first preset duration threshold value, controlling the solid-state switching circuit to be in a state corresponding to the second control instruction according to the second control instruction. Similar to the first control command, the solid state switching circuit will eventually be in an off state if the second control command is a break gate command, and in an on state if the second control command is a close gate command.
Step S104, counting the time length of the solid-state switch circuit in the state corresponding to the second control instruction to obtain a second time length.
The statistics of the second duration is performed in synchronization with step S103, that is, the statistics of the second duration in which the solid-state switching circuit is in the state corresponding to the second control command is started while the solid-state switching circuit is controlled to be in the state corresponding to the second control command. The embodiment of the present invention is described in two steps, which is only for the sake of clarity and expression, and is not a strict and unchangeable limitation on the execution sequence of step S103 and step S104.
Step S105, judging whether a first control instruction is received before the second time length reaches a second preset time length threshold value, if yes, returning to the step S101; if not, go to step S106.
Judging whether a first control instruction sent by the control and protection device is received before the second time length reaches a second preset time length threshold value, if so, returning to the step S101, responding to the first control instruction, controlling the solid-state switching circuit to be in a state corresponding to the first control instruction, and starting to count the first time length; if not, the second control instruction is continued to be executed, and step S106 is executed.
It should be noted that, in the embodiment of the present invention, the first preset duration threshold and the second preset duration threshold are given according to parameters of the dc breaker and corresponding control experiences, and specific values of the first preset duration threshold and the second preset duration threshold are not limited.
And S106, breaking a vacuum contactor connected with the solid-state switching circuit in series or closing a fast switch.
In the step, a specific execution operation is required to be determined according to the content of a control instruction which is finally executed, and if the control instruction which is finally executed is a brake-separating instruction, the step is to separate a vacuum contactor which is connected with a solid-state switch circuit in series, so that the brake-separating operation is completed; correspondingly, if the finally executed control instruction is a closing instruction, the step is to close the quick switch, and the closing operation is completed.
In summary, in the dc breaker control method provided by the embodiment of the present invention, the duration is set to be the waiting time of the first preset duration threshold, and the second control instruction that may be obtained is responded through the waiting time, so that the continuous execution of the first control instruction is avoided, and the time is reserved for timely responding to the second control instruction; if the direct current breaker receives the second control instruction within the waiting time, the state of the solid state switching circuit is changed, the state of the branch circuit of the direct current breaker is adjusted through the solid state switching circuit, and the solid state switching circuit is built based on the power electronic device, so that the opening or closing time of the solid state switching circuit is very short and is usually of the mu s level, the connection state of the circuit can be changed within a shorter time, and the response speed to the second control instruction is further improved.
Similarly, the first control instruction may be waited for in the process of executing the second control instruction, where the waiting time period is a second preset time period threshold, and the state of the solid-state switch circuit is changed first. Therefore, the control method of the direct current breaker can obviously improve the timeliness of responding to the control instruction and meet the requirements of practical application.
It should be noted that, in combination with the above description and the flowchart shown in fig. 1, if the second control instruction is received during the process of executing the first control instruction, the second control instruction is executed in turn; in the process of executing the second control instruction, the first control instruction is received again, and the first control instruction is executed again according to the control logic, so that the control program enters a dead loop and cannot be executed in step S106. In practical use, the situation can not occur, because the control instruction received by the controller executing the control method provided by the embodiment of the invention comes from the control equipment such as the protection control device, the protection control device has strict limitation on the sending times of the opening instruction and the closing instruction in a certain time, namely the opening and closing operation of the direct current breaker can not be frequently controlled, otherwise the service life of the direct current breaker can be seriously reduced, and therefore, the control method of the direct current breaker provided by the embodiment of the invention can not enter into a dead cycle.
The following specifically describes an execution process of the control method of the dc breaker provided in the embodiment of the present invention, taking the first control instruction as a switching-off instruction and the second control instruction as a switching-on instruction as an example. According to the above, if the first control instruction is a closing instruction, the second control instruction is a separating instruction, and the execution process of the second control instruction may refer to the case that the first control instruction is the separating instruction, which is not described herein.
Optionally, referring to fig. 2, fig. 2 is a flowchart of another control method of a dc breaker according to an embodiment of the present invention. The process may include:
step S200, a brake separating instruction is obtained.
As mentioned above, the opening command may be issued by the aforementioned protection device or may be issued by other control devices, which will not be described herein.
Step S201, in response to the opening command, the on-off state information of the fast switch is obtained.
After receiving the opening command, firstly, the switch state information of the quick switch is obtained, and the switch state information can represent whether the quick switch is at the closing position or the opening position.
It should be noted that, the specific manner of acquiring the switch state information and the specific form of the switch state information may be implemented by referring to the manner in the prior art, which is not limited by the present invention.
Step S202, judging whether the switch state information indicates that the fast switch is at a closing position, if so, executing step S203, and if not, executing step S207.
And step S203, controlling the quick switch to be turned off, and starting to count the third time length.
If the switch state information indicates that the quick switch is at a closing position, the quick switch needs to be controlled to be disconnected, and meanwhile, the time length of the quick switch for executing the disconnection operation, namely the third time length, is counted. It is conceivable that the purpose of the third time period is to wait for the fast switch port to open and then generate an arc.
Step S204, judging whether the third duration reaches a third preset duration threshold, if so, executing step S205; if not, continuing to wait until the third duration reaches a third preset duration threshold.
And when the third duration reaches a third preset duration threshold, the fast switch is turned on, and an arc meeting the breaking requirement is generated, and at this time, the step S205 can be continuously executed.
In step S205, the solid-state switching circuit and the magnetic coupling device are controlled to be turned on, and the fourth time period starts to be counted.
Optionally, for a part of the magnetic coupling device, the current direction of the current flowing through the dc breaker needs to be clarified, specifically, a current transformer in the prior art may be adopted to implement the present invention, which is not described herein again. After the current direction flowing through the direct current breaker is determined, a target thyristor corresponding to the current direction in the magnetic coupling device can be determined according to the current direction, and the target thyristor is controlled to be conducted, so that the conduction of the magnetic coupling device is realized.
Alternatively, referring to fig. 3, fig. 3 is a topological structure diagram of a magnetic coupling device in the prior art, and since only one thyristor is disposed in the magnetic coupling device, it is not necessary to determine the current direction flowing through the dc breaker during the process of controlling the conduction of the magnetic coupling device.
Step S206, judging whether the fourth time length reaches a fourth preset time length threshold, if yes, executing step S207, and if not, continuing to count until the fourth time length reaches the fourth preset time length threshold.
It should be noted that, when the fourth time period reaches the fourth preset time period threshold, the dielectric insulation between the contacts waiting for the fast switch is restored to a level sufficient to withstand the overvoltage of the system, and then step S207 is performed.
In step S207, the solid-state switching circuit is controlled to be turned off, and the first time period is counted.
And after the fourth time length reaches a fourth preset time length threshold, the solid-state switch circuit can be controlled to be turned off, and the first time length is counted at the same time.
From step S200 to step S207, a control process for controlling the solid-state switch circuit to be in a state corresponding to the first control command in the embodiment shown in fig. 1 is implemented, and meanwhile, counting the first time length is started, and whether a closing command is received is judged before the first time length reaches a first preset time length threshold, i.e. step S208.
Accordingly, if in step S202, the switch state information indicates that the fast switch is in the open position, the process may directly jump from step S202 to step S207.
Step S208, judging whether a closing instruction is received before the first time length reaches a first preset time length threshold value. If a closing instruction is received, executing step S210; accordingly, if the closing instruction is not received, step S209 is performed.
And S209, breaking a vacuum contactor connected with the solid-state switching circuit in series.
If the controller does not receive the switching-on instruction before the first time length reaches the first preset time length threshold value, the switching-off instruction is continuously executed, the vacuum circuit breaker connected with the solid-state switching circuit in series is disconnected, and the switching-off operation is completed.
Step S210, in response to a closing instruction, contactor state information of the vacuum circuit breaker is obtained.
And when the direct current system needs to be powered on again after power failure, or needs to execute reclosing operation after protection switching off, the controller can receive a switching-on instruction sent by the protection control device. After receiving the closing instruction, the controller firstly acquires the state information of the contactor so as to judge the current state of the vacuum circuit breaker.
Step S211, judging whether the contactor state information represents that the vacuum contactor is at a brake-separating position, if so, executing step S212; if the vacuum contactor is currently in the closing position, step S214 is performed.
Similar to the switch state information, the method for acquiring the contactor state information and the specific form of the contactor state information can be implemented by referring to the method in the prior art, which is not limited in the present invention.
In step S212, the vacuum contactor is controlled to be closed, and the fifth time period starts to be counted.
Step S213, judging whether the fifth time length reaches a fifth preset time length threshold value, if so, executing step S214; if not, continuing to wait until the fifth time length reaches a fifth preset time length threshold value.
It is conceivable that the fifth preset duration threshold corresponds to the time required for the vacuum contactor to be completely closed, and therefore, the setting of the fifth preset duration threshold may refer to the intrinsic parameters and the action characteristic setting of the vacuum contactor, and the selection of the fifth preset duration threshold is not limited in the present invention.
In step S214, the solid-state switch circuit is controlled to be turned on, and the second duration is counted.
From step S210 to step S214, a control process for controlling the solid-state switch circuit to be in a state corresponding to the second control instruction in the embodiment shown in fig. 1 is implemented, and meanwhile, the second duration is counted, and whether the switch-off instruction is received is determined before the second duration reaches a second preset duration threshold, that is, step S215.
Accordingly, if in step S211, the contactor status information indicates that the vacuum contactor is in the closed position, the process may directly jump from step S211 to step S214.
Step S215, judging whether a brake-off instruction is received before the second time length reaches a second preset time length threshold value. If yes, go back to step S200, if no, go to step S216.
And if the controller receives the opening command again within the time with the duration being the second preset duration threshold, the controller needs to return to execute the step S200 to respond to the opening command.
Step S216, closing the fast switch.
If the opening command is not received before the second time length reaches the second preset time length threshold value, the closing command is executed as a final command, the fast switch is closed, and the closing operation is completed.
In summary, by the direct current breaker control method provided by the embodiment of the invention, the timeliness of responding to the control instruction can be obviously improved, the requirements of practical application are met, the rapid isolation of fault current is realized, the influence on the whole direct current system is reduced, further, the rapid disconnection of the fault current can be realized, and the design complexity and cost of the rapid switch are reduced.
Alternatively, referring to fig. 4, fig. 4 is a topology structure diagram of a dc breaker according to an embodiment of the present invention. The dc breaker provided in the embodiment of the present invention includes at least one fast switch 10, at least one solid state switching circuit 20, a magnetic coupling device 30, a vacuum contactor 40, and a controller (not shown), wherein,
each fast switch 10 is connected in series in sequence to form a main current branch;
each solid-state switching circuit 20, the magnetic coupling device 30, and the vacuum contactor 40 are sequentially connected in series to form a transfer current branch;
the main current branch is connected with the transfer current branch in parallel;
a controller is connected to the control terminals of the fast switch 10, the solid state switching circuit 20, the magnetic coupling device 30, and the vacuum contactor 40, respectively, for performing the dc breaker control method provided by any one of the above-mentioned aspects of the present invention.
In the invention, each embodiment is described in a progressive manner, and each embodiment is mainly used for illustrating the difference from other embodiments, and the same similar parts among the embodiments are mutually referred. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The above description is only of the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. While the invention has been described with reference to preferred embodiments, it is not intended to be limiting. Any person skilled in the art can make many possible variations and modifications to the technical solution of the present invention or modifications to equivalent embodiments using the methods and technical contents disclosed above, without departing from the scope of the technical solution of the present invention. Therefore, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
Claims (7)
1. A method of controlling a dc circuit breaker, the method being applied to a controller in the dc circuit breaker, the dc circuit breaker comprising: the device comprises at least one fast switch, at least one solid-state switch circuit, a magnetic coupling device, a vacuum contactor and a controller, wherein the fast switches are sequentially connected in series to form a main current branch; each solid-state switching circuit, the magnetic coupling device and the vacuum contactor are sequentially connected in series to form a transfer current branch; the main current branch is connected with the transfer current branch in parallel; the method comprises the following steps:
acquiring a first control instruction, wherein the first control instruction comprises a brake opening instruction or a brake closing instruction;
responding to the first control instruction, controlling the solid-state switching circuit to be in a state corresponding to the first control instruction, and starting to count a first time length;
if a second control instruction is received before the first time length reaches a first preset time length threshold value, responding to the second control instruction, and controlling the solid-state switching circuit to be in a state corresponding to the second control instruction; the first control instruction is the opening instruction, the second control instruction is the closing instruction, and the second control instruction is the opening instruction;
if the first control instruction is the opening instruction, breaking a vacuum contactor connected with the solid-state switching circuit in series; if the first control instruction is the closing instruction, closing a quick switch;
if the first control instruction is the opening instruction, the control solid-state switch circuit is in a state corresponding to the first control instruction, including:
acquiring the switching state information of the quick switch;
if the switch state information indicates that the quick switch is at a closing position, controlling the quick switch to be disconnected, and starting counting a third duration;
if the third time length reaches a third preset time length threshold value, controlling the solid-state switching circuit and the magnetic coupling device to be conducted, and starting to count a fourth time length;
if the fourth time length reaches a fourth preset time length threshold value, the solid-state switching circuit is controlled to be turned off;
if the first control instruction is the closing instruction, the control solid-state switch circuit is in a state corresponding to the first control instruction, including:
acquiring contactor state information of the vacuum contactor;
if the contactor state information indicates that the vacuum contactor is at a switching-off position, controlling the vacuum contactor to be closed, and starting to count a fifth time period;
and if the fifth time length reaches a fifth preset time length threshold value, controlling the solid-state switch circuit to be conducted.
2. The direct current breaker control method according to claim 1, characterized by further comprising:
counting the time length of the solid-state switching circuit in a state corresponding to the second control instruction to obtain a second time length;
and if the first control instruction is received before the second time length reaches a second preset time length threshold value, returning to the response of the first control instruction, controlling the solid-state switching circuit to be in a state corresponding to the first control instruction, and starting counting the first time length.
3. The method according to claim 1, wherein if the second control command is not received before the first time period reaches the first preset time period threshold, the step of breaking the vacuum contactor connected in series with the solid state switching circuit or closing the fast switching is performed.
4. The direct current breaker control method according to claim 1, characterized by further comprising:
and if the switch state information indicates that the fast switch is at the opening position, executing the step of controlling the solid-state switch circuit to be turned off.
5. The method of claim 1, wherein controlling the conduction of the magnetic coupling device comprises:
acquiring the current direction;
determining a target thyristor corresponding to the current direction in the magnetic coupling device;
and controlling the target thyristor to be conducted.
6. The direct current breaker control method according to claim 1, characterized by further comprising:
and if the contactor state information indicates that the vacuum contactor is at a closing position, executing the step of controlling the solid-state switch circuit to be conducted.
7. A direct current circuit breaker, comprising: at least one fast switch, at least one solid state switching circuit, a magnetic coupling, a vacuum contactor, and a controller, wherein,
each rapid switch is sequentially connected in series to form a main current branch;
each solid-state switching circuit, the magnetic coupling device and the vacuum contactor are sequentially connected in series to form a transfer current branch;
the main current branch is connected with the transfer current branch in parallel;
the controller is respectively connected with the fast switch, the solid-state switch circuit, the magnetic coupling device and the control end of the vacuum contactor, and is used for executing the direct current breaker control method according to any one of claims 1-6.
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