CN114498578A - Direct current power supply and distribution protection method and device, computer equipment and storage medium - Google Patents
Direct current power supply and distribution protection method and device, computer equipment and storage medium Download PDFInfo
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- 238000004590 computer program Methods 0.000 claims description 6
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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
- H02H7/268—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 invention relates to a direct current power supply and distribution protection method, a direct current power supply and distribution protection device, computer equipment and a storage medium.
Description
Technical Field
The present invention relates to the field of dc power supply and distribution, and in particular, to a method and an apparatus for dc power supply and distribution protection, a computer device, and a storage medium.
Background
With the continuous abundance of power consumption demands, the low-voltage direct-current power supply and distribution system is more and more common in use scene due to the factors of the convenience for the access of distributed energy, the relatively longer power supply radius, the occurrence of a large number of direct-current loads such as charging piles and the like, and becomes an important direction for the development of the power distribution network. However, the devices of the dc power supply and distribution system are more complex and diversified than the ac system, and the existence of a large number of power electronic devices poses a greater challenge to the relay protection of the dc system.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a method, an apparatus, a computer device, and a storage medium for protecting dc power supply and distribution.
A DC power supply and distribution protection method is applied to a low-voltage DC power supply and distribution system, the power supply and distribution system comprises a main circuit and a branch circuit, the main circuit comprises a first protection device used for being connected with a bus and an AC power grid, the branch circuit comprises a second protection device connected with the bus and a power supply device connected with the second protection device, and the method comprises the following steps:
acquiring current information flowing through the main circuit and the branch circuit;
acquiring power distribution fault position information according to the current information and corresponding preset current information;
and controlling the first protection device and/or the second protection device to perform corresponding actions according to the power distribution fault position information.
In one embodiment, the obtaining of the distribution fault location information according to the current information and the corresponding preset current information includes:
and when the current information of the main circuit does not meet the corresponding preset current information, generating first fault position information, wherein the first fault position information indicates that the main circuit has a power distribution fault.
In one embodiment, the controlling the first protection device and/or the second protection device to perform corresponding actions according to the power distribution fault location information includes:
and controlling the first protection device to perform fault protection action according to the first fault position information.
In one embodiment, acquiring power distribution fault location information according to the current information and corresponding preset current information includes:
and when the current information of the branch circuit does not meet the corresponding preset current information, generating second fault position information, wherein the second fault position information indicates that the branch circuit has a power distribution fault.
In one embodiment, the generating second fault location information when the current information of the branch circuit does not satisfy the corresponding preset current information includes:
acquiring a preset ratio of the capacity of the first protection device to the capacity of the power supply device;
when the ratio of the overcurrent flowing through the branch circuit to the rated current is greater than the preset ratio, second fault location information is generated.
In one embodiment, controlling the first protection device and/or the second protection device to perform corresponding actions according to the power distribution fault location information includes:
and controlling the second protection device to perform fault protection action according to the second fault position information.
In one embodiment, the method further comprises the following steps:
acquiring direct-current voltage at the output side of the first protection device;
when the output side direct current voltage is lower than the corresponding preset voltage, generating a working mode switching instruction;
and switching the working mode of the first protection device according to the working mode switching instruction so as to adjust the amplitude of the output current of the first protection device.
A DC power supply and distribution protection device is applied to a low-voltage DC power supply and distribution system, the power supply and distribution system comprises a main circuit and a branch circuit, the main circuit comprises a first protection device connected with a bus and an AC power grid, the branch circuit comprises a second protection device connected with the bus and a power supply device connected with the second protection device, and the low-voltage DC power supply and distribution protection device comprises:
the current information acquisition module is used for acquiring current information flowing through the main circuit and the branch circuit;
the fault information acquisition module is used for acquiring power distribution fault position information according to the current information and corresponding preset current information;
and the control protection module is used for controlling the first protection device and/or the second protection device to perform corresponding actions according to the power distribution fault position information.
A computer device comprising a memory and a processor, the memory having stored therein a computer program which, when executed by the processor, causes the processor to carry out the steps of the method as described above.
A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method as described above.
According to the direct-current power supply and distribution protection method, the direct-current power supply and distribution protection device, the current information flowing through the main circuit and the branch circuit is obtained, the power distribution fault position information is obtained according to the current information and the corresponding preset current information, and the first protection device and/or the second protection device are controlled to perform corresponding actions according to the power distribution fault position information, so that the short-circuit faults at different positions of the low-voltage direct-current power supply and distribution system can be quickly removed and relay protection can be realized under the condition that digital protection is not additionally arranged.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow diagram of a DC power supply and distribution protection method in one embodiment;
FIG. 2 is a schematic diagram of a low-voltage DC power supply and distribution system according to an embodiment;
FIG. 3 is a flow diagram of a DC power supply and distribution protection method according to an embodiment;
FIG. 4 is a flow diagram of a DC power supply and distribution protection method according to an embodiment;
FIG. 5 is a block diagram of an embodiment of a DC power supply and distribution protection device;
fig. 6 is a block diagram of a dc power supply and distribution protection device according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first client may be referred to as a second client, and similarly, a second client may be referred to as a first client, without departing from the scope of the present application. Both the first client and the second client are clients, but they are not the same client. Also, as used in this specification, the term "and/or" includes any and all combinations of the associated listed items.
Referring to fig. 1, a flow chart of a dc power supply and distribution protection method according to an embodiment is shown.
In this embodiment, the dc power supply and distribution protection method is applied to a low-voltage dc power supply and distribution system, and the power supply and distribution system includes a main circuit and a branch circuit; the main circuit comprises a first protection device connected with a bus and an alternating current power grid, and the branch circuit comprises a second protection device connected with the bus and a power supply device connected with the second protection device. As shown in fig. 1, the dc power supply and distribution protection method includes steps 102 to 106.
And 102, acquiring current information flowing through the main circuit and the branch circuit.
Optionally, referring to fig. 2, a schematic diagram of a low-voltage dc power supply and distribution system in an embodiment is shown. As shown in fig. 2, the main circuit includes a first protection device for connecting with a bus and an alternating current network, and further includes an AC/DC converter branch and a bus circuit, and the AC/DC converter branch is a connection circuit between the alternating current network and the bus; the branch circuit comprises a second protection device connected with the bus, a power supply device connected with the second protection device, and a DC/DC converter branch circuit, wherein the DC/DC converter branch circuit is a connecting circuit between the power supply device and the bus; the number of the branch circuits is multiple, each branch circuit corresponds to one power supply device, and the power supply devices of different branch circuits are the same or different. Each power supply device comprises a DC/DC converter connected with the second protection device, a distributed power supply, a DC energy storage device and a DC load device. Wherein the distributed power source comprises a photovoltaic power source; the direct-current energy storage device comprises a direct-current energy storage battery.
The first protection device comprises an AC/DC converter and/or a mechanical direct current breaker configured in an AC/DC converter branch, and the AC/DC converter is configured with a fault ride-through function; and a second protection device comprising a mechanical direct current breaker arranged in the DC/DC converter branch. Specifically, when a current fault exists in a branch circuit, a release of a mechanical direct current circuit breaker generally opens and closes current by a thermal release or magnetic release principle, and the action characteristic of the release has the characteristic of inverse time limit: the larger the short-circuit current, the shorter the switching-off time.
The current information of the main circuit comprises current amplitude information flowing through a bus and current amplitude information flowing through a connecting circuit between an alternating current power grid and the bus; the current information of the branch circuit includes current amplitude information flowing through a connection circuit between the bus and the distributed power supply device, current amplitude information flowing through a connection circuit between the bus and the dc energy storage device, and current amplitude information flowing through a connection circuit between the bus and the load device.
The method for acquiring the current information flowing through the main circuit and the branch circuit can be current detection through a current measuring device, such as a current probe, a multimeter, and the like.
And 104, acquiring power distribution fault position information according to the current information and the corresponding preset current information.
Optionally, the preset current information includes preset information of a current amplitude flowing through the bus, preset information of a current amplitude flowing through a connection circuit between the ac power grid and the bus, preset information of a current amplitude flowing through a connection circuit between the bus and the distributed power supply apparatus, and preset information of a current amplitude flowing through a connection circuit between the bus and the load apparatus.
The method for acquiring the power distribution fault position information may be determined by comparing the relationship between the actual current information and the corresponding preset current information. Specifically, whether a power distribution fault exists in the main circuit is determined by comparing the actually measured current amplitude flowing through the main circuit with the preset current amplitude flowing through the main circuit. For example, the actual measured magnitude of the current flowing through the bus is compared to a predetermined magnitude of the current flowing through the bus to determine whether a power distribution fault exists in the bus.
In addition, the actual measured current amplitude flowing through the branch circuit is compared with the preset current amplitude flowing through the branch circuit to determine whether the distribution fault exists in the branch circuit. For example, the actually measured current amplitude of the connection circuit between the bus bar and the distributed power supply apparatus, the preset current amplitude relationship flowing through the connection circuit between the bus bar and the distributed power supply apparatus are compared to determine whether or not there is a power distribution fault in the connection circuit between the bus bar and the distributed power supply apparatus.
And 106, controlling the first protection device and/or the second protection device to perform corresponding actions according to the power distribution fault position information.
The method for controlling the first protection device and/or the second protection device to perform corresponding actions according to the power distribution fault position information can be that a power distribution protection instruction is generated according to the power distribution fault position information, and the first protection device, the second protection device or the first protection device and the second protection device are controlled to perform direct-current power distribution protection actions by using the power distribution protection instruction so as to remove the power distribution fault.
According to the direct-current power supply and distribution protection method provided in the embodiment, the current information flowing through the main circuit and the branch circuit is obtained, the power distribution fault position information is obtained according to the current information and the corresponding preset current information, and the first protection device and/or the second protection device are controlled to perform corresponding actions according to the power distribution fault position information, so that the short-circuit faults at different positions of the low-voltage direct-current power supply and distribution system can be quickly removed and relay protection can be realized under the condition that digital protection is not additionally arranged.
In one embodiment, step 104 includes generating first fault location information when the current information of the main circuit does not satisfy the corresponding preset current information, the first fault location information indicating that a power distribution fault exists with the main circuit.
The first fault position information comprises distribution fault position information in a bus and distribution fault position information in a connecting circuit between an alternating current power grid and the bus.
When the actually measured current amplitude flowing through the main circuit does not meet the preset current amplitude flowing through the main circuit, first fault position information is generated and used for indicating that a power distribution fault exists in the main circuit, namely the specific position information of the power distribution fault. For example, when actually measured current amplitude information flowing through a connection circuit between the ac power grid and the bus does not satisfy a preset current amplitude flowing through the connection circuit between the ac power grid and the bus, first fault location information is generated, and at this time, the first fault location information is used to indicate that a power distribution fault exists in the connection circuit between the ac power grid and the bus, that is, the specific location information of the power distribution fault is the connection circuit between the ac power grid and the bus.
In one embodiment, step 106 includes controlling the first protection device to perform a fault protection action based on the first fault location information.
Specifically, when the actually measured current amplitude flowing through the main circuit does not meet the preset current amplitude flowing through the main circuit, first fault position information is generated, and the first fault position information is used for indicating that a power distribution fault exists in the main circuit; and then controlling the first protection device to perform fault protection action according to the first fault position information so as to cut off the power distribution fault existing in the main circuit. For example, when the actually measured current amplitude information flowing through the connecting circuit between the alternating current power grid and the bus does not meet the preset current amplitude flowing through the connecting circuit between the alternating current power grid and the bus, first fault position information is generated, and the AC/DC converter is controlled to stop after the power distribution fault crossing time is over according to the first fault position information, so that relay protection of the power distribution system is realized.
In one embodiment, step 104 further includes generating second fault location information when the current information of the branch circuit does not satisfy the corresponding preset current information, the second fault location information indicating that the branch circuit has a power distribution fault.
The second fault location information includes distribution fault location information in a connection circuit between the bus and the distributed power supply device, distribution fault location information in a connection circuit between the bus and the direct current energy storage device, and distribution fault location information in a connection circuit between the bus and the load device.
And generating second fault position information when the actually measured current amplitude flowing through the branch circuit does not meet the preset current amplitude flowing through the branch circuit, wherein the second fault position information is used for indicating that the branch circuit has a power distribution fault, namely the specific position information of the power distribution fault. For example, when the actually measured current amplitude information flowing through the connection circuit between the bus and the dc energy storage device does not satisfy the preset current amplitude flowing through the connection circuit between the bus and the dc energy storage device, second fault location information is generated, and at this time, the second fault location information is used to indicate that a power distribution fault exists in the connection circuit between the bus and the dc energy storage device, that is, the specific location information of the power distribution fault is the connection circuit between the bus and the dc energy storage device.
Fig. 3 is a flowchart of a dc power supply and distribution protection method according to an embodiment. The direct current power supply and distribution protection method is a refining step of a specific process of generating second fault position information when the current information of a branch circuit does not meet corresponding preset current information. As shown in fig. 3, the dc power supply and distribution protection method includes steps 302 to 304.
Optionally, the preset ratio of the first protection device capacity to the power supply device capacity refers to a ratio of a rated power of the AC/DC converter to a rated power of the power supply device. The rated configuration power of the power supply device can be the sum of the rated power of the distributed power supply, the rated power of the direct-current energy storage device and the rated power of the direct-current load device. Specifically, the preset ratio of the capacity of the first protection device to the capacity of the power supply device may be a ratio of the rated power of the AC/DC converter to the sum of the rated powers of the distributed power supply, the DC energy storage device and the DC load device; the action of the molded case circuit breaker presents an inverse time limit characteristic, the action is faster when the overcurrent multiple is larger, and the action is slower when the overcurrent multiple is smaller, and the ratio design reference value is generally not less than 8, so that the rapid action of ten to twenty milliseconds can be realized under the condition that the normal molded case circuit breaker has eight times of rated current flowing.
In step 304, second fault location information is generated when the ratio of the overcurrent flowing through the branch circuit to the rated current is greater than a preset ratio.
And when the ratio of the actually measured current amplitude flowing through the branch circuit to the preset rated current amplitude is greater than the preset ratio of the capacity of the second protection device to the capacity of the power supply device, generating second fault position information, wherein the second fault position information is used for indicating that a power distribution fault exists in the branch circuit, namely the specific position information of the power distribution fault.
For example, when the ratio of the actually measured current amplitude flowing through the connection circuit between the bus and the distributed power supply device to the corresponding preset rated current amplitude is greater than the ratio of the rated power of the AC/DC converter to the sum of the rated powers of the distributed power supply, the DC energy storage device, and the DC load device, second fault location information is generated, and the second fault location information indicates that a power distribution fault exists in the connection circuit between the bus and the distributed power supply device, that is, the specific location information of the power distribution fault is the connection circuit between the bus and the distributed power supply device.
In one embodiment, step 106 includes controlling the second protection device to perform a fault protection action based on the second fault location information.
Specifically, when the actually measured current amplitude flowing through the branch circuit does not meet the preset current amplitude flowing through the branch circuit, second fault position information is generated, and the second fault position information is used for indicating that a power distribution fault exists in the branch circuit; and then controlling a second protection device to perform fault protection action according to the second fault position information so as to cut off the power distribution fault existing in the branch circuit. For example, when the actually measured current amplitude information flowing through the connection circuit between the bus and the distributed power supply device does not satisfy the preset current amplitude flowing through the connection circuit between the bus and the distributed power supply device, second fault position information is generated, and a branch circuit breaker configured in the connection circuit between the bus and the distributed power supply device is controlled to trigger selective action according to the second fault position information, so that the power distribution fault is removed, and the relay protection of the system is further realized.
Referring to fig. 4, a flowchart of a dc power supply and distribution protection method according to an embodiment is shown. On the basis of the above embodiment, as shown in fig. 4, the dc power supply and distribution protection method further includes steps 402 to 406.
Alternatively, the DC voltage at the output side of the first protection device may be an AC/DC converter output side DC voltage amplitude.
And step 404, generating a working mode switching instruction when the output side direct current voltage is lower than the corresponding preset voltage.
And 406, switching the working mode of the first protection device according to the working mode switching instruction to adjust the amplitude of the output current of the first protection device.
When a short-circuit fault occurs in an AC/DC converter branch, the actually measured DC voltage amplitude of the output side of the AC/DC converter is lower than the corresponding preset voltage amplitude, and at the moment, the AC/DC converter judges that the short-circuit fault occurs on the DC output side and generates an AC/DC converter working mode switching instruction; and after the working mode of the converter is switched according to the working mode switching instruction, the converter is switched to be in current limiting output and is kept in the working mode for a period of time, and if the direct-current voltage at the output side is continuously lower than the corresponding preset voltage after the period of current limiting output time, the AC/DC converter is stopped, so that the whole system is stopped completely, and the power distribution fault is removed, and the relay protection of the system is realized. Optionally, the duration of the current limited output is adjustable, typically on the order of seconds, not to exceed 5 seconds.
In the direct-current power supply and distribution protection method provided in the embodiment, by obtaining the direct-current voltage at the output side of the first protection device, when the direct-current voltage at the output side is lower than the corresponding preset voltage, a working mode switching instruction is generated, and according to the working mode switching instruction, the working mode of the first protection device is switched to adjust the amplitude of the output current of the first protection device, so that relay protection is performed on the low-voltage direct-current power supply and distribution system without adding digital protection.
It should be understood that although the various steps in the flow charts of fig. 1 and 3-4 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 1 and 3-4 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performing the sub-steps or stages is not necessarily sequential, but may be performed alternately or alternatingly with other steps or at least some of the sub-steps or stages of other steps. It should be noted that the different embodiments described above may be combined with each other.
Fig. 5 is a block diagram of the dc power supply and distribution protection device in an embodiment.
In this embodiment, the dc power supply and distribution protection device is applied to a low-voltage dc power supply and distribution system, where the power supply and distribution system includes a main circuit and a branch circuit, the main circuit includes a first protection device connected to a bus and an ac power grid, and the branch circuit includes a second protection device connected to the bus and a power supply device connected to the second protection device. The dc power supply and distribution protection device includes a current information obtaining module 502, a fault information obtaining module 504, and a control protection module 506.
The current information obtaining module 502 is configured to obtain information of current flowing through the main circuit and the branch circuit.
And a fault information obtaining module 504, configured to obtain power distribution fault location information according to the current information and the corresponding preset current information.
And the control protection module 506 is used for controlling the first protection device and/or the second protection device to perform corresponding actions according to the power distribution fault location information.
In this embodiment, each module is used to execute each step in the corresponding embodiment in fig. 1, and specific reference is made to fig. 1 and the related description in the corresponding embodiment in fig. 1, which are not repeated herein.
In the dc power supply and distribution protection device provided in this embodiment, the current information flowing through the main circuit and the branch circuit is acquired by the current information acquisition module 502, the fault information acquisition module 504 acquires power distribution fault location information according to the current information and the corresponding preset current information, and the control protection module 506 controls the first protection device and/or the second protection device to perform corresponding actions according to the power distribution fault location information, so that the short-circuit faults at different locations of the low-voltage dc power supply and distribution system are quickly removed and relay protection is performed without adding digital protection.
On the basis of the above embodiment, as shown in fig. 6, the dc power supply and distribution protection device further includes: a dc voltage obtaining module 602, a switching command generating module 604, and a switching control module 606.
A dc voltage obtaining module 602, configured to obtain a dc voltage at an output side of the first protection device.
The switching instruction generating module 604 is configured to generate an operating mode switching instruction when the output-side dc voltage is lower than a corresponding preset voltage.
And a switching control module 606, configured to switch the working mode of the first protection device according to the working mode switching instruction, so as to adjust the amplitude of the output current of the first protection device.
In this embodiment, each module is configured to execute each step in the embodiment corresponding to fig. 4, and specific reference is made to fig. 4 and the related description in the embodiment corresponding to fig. 4, which are not repeated herein.
In the dc power supply and distribution protection method provided in this embodiment, the dc voltage at the output side of the first protection device is obtained by the dc voltage obtaining module 602, the switching instruction generating module 604 generates a working mode switching instruction when the dc voltage at the output side is lower than the corresponding preset voltage, and the switching control module 606 switches the working mode of the first protection device according to the working mode switching instruction to adjust the amplitude of the output current of the first protection device, so as to implement relay protection on the low-voltage dc power supply and distribution system without adding digital protection.
The division of each module in the dc power supply and distribution protection device is only for illustration, and in other embodiments, the dc power supply and distribution protection device may be divided into different modules as needed to complete all or part of the functions of the dc power supply and distribution protection device.
For specific limitations of the dc power supply and distribution protection device, reference may be made to the above limitations of the dc power supply and distribution protection method, which is not described herein again. All or part of each module in the above dc power supply and distribution protection device can be implemented by software, hardware and their combination. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
The embodiment of the present application further provides a computer device, which includes a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor is enabled to execute the steps of the method in the foregoing embodiments.
The embodiment of the application also provides a computer readable storage medium. One or more non-transitory computer-readable storage media containing computer-executable instructions that, when executed by one or more processors, cause the processors to perform the steps of the dc power supply and distribution protection method.
The direct-current power supply and distribution protection method, the direct-current power supply and distribution protection device, the computer equipment and the storage medium provided in the embodiment have important economic value and popularization and practice value for quickly removing short-circuit faults at different positions of a low-voltage direct-current power supply and distribution system and protecting relays under the condition that digital protection is not additionally arranged.
Any reference to memory, storage, database, or other medium used herein may include non-volatile and/or volatile memory. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM), which acts as external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms, such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), Enhanced SDRAM (ESDRAM), synchronous Link (Synchlink) DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and bus dynamic RAM (RDRAM).
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A DC power supply and distribution protection method is applied to a low-voltage DC power supply and distribution system, the power supply and distribution system comprises a main circuit and a branch circuit, the main circuit comprises a first protection device connected with a bus and an AC power grid, the branch circuit comprises a second protection device connected with the bus and a power supply device connected with the second protection device, and the method is characterized by comprising the following steps:
acquiring current information flowing through the main circuit and the branch circuit;
acquiring power distribution fault position information according to the current information and corresponding preset current information;
and controlling the first protection device and/or the second protection device to perform corresponding actions according to the power distribution fault position information.
2. The method of claim 1, wherein obtaining power distribution fault location information from the current information and corresponding preset current information comprises:
and when the current information of the main circuit does not meet the corresponding preset current information, generating first fault position information, wherein the first fault position information indicates that the main circuit has a power distribution fault.
3. The method of claim 2, wherein the controlling the first protection device and/or the second protection device to perform corresponding actions according to the power distribution fault location information comprises:
and controlling the first protection device to perform fault protection action according to the first fault position information.
4. The method of claim 1, wherein obtaining power distribution fault location information from the current information and corresponding preset current information comprises:
and when the current information of the branch circuit does not meet the corresponding preset current information, generating second fault position information, wherein the second fault position information indicates that the branch circuit has a power distribution fault.
5. The method of claim 4, wherein generating second fault location information when the current information of the branch circuit does not satisfy corresponding preset current information comprises:
acquiring a preset ratio of the capacity of the first protection device to the capacity of the power supply device;
when the ratio of the overcurrent flowing through the branch circuit to the rated current is greater than the preset ratio, second fault location information is generated.
6. The method of claim 4, wherein controlling the first protection device and/or the second protection device to perform corresponding actions according to the power distribution fault location information comprises:
and controlling the second protection device to perform fault protection action according to the second fault position information.
7. The method of any one of claims 1-6, further comprising:
acquiring direct-current voltage at the output side of the first protection device;
when the output side direct current voltage is lower than the corresponding preset voltage, generating a working mode switching instruction;
and switching the working mode of the first protection device according to the working mode switching instruction so as to adjust the amplitude of the output current of the first protection device.
8. A kind of direct current supplies and distributes the protective device, apply to the low-pressure direct current and supplies and distributes the electrical system, supply and distribute the electrical system and include main circuit and branch circuit, the said main circuit includes the first protective device used for connecting with bus, alternating current electric wire netting, the said branch circuit includes the second protective device connected with said bus and power supply unit connected with said second protective device, characterized by that, including:
the current information acquisition module is used for acquiring current information flowing through the main circuit and the branch circuit;
the fault information acquisition module is used for acquiring power distribution fault position information according to the current information and corresponding preset current information;
and the control protection module is used for controlling the first protection device and/or the second protection device to perform corresponding actions according to the power distribution fault position information.
9. A computer arrangement comprising a memory and a processor, the memory having stored thereon a computer program that, when executed by the processor, causes the processor to carry out the steps of the method according to any one of claims 1 to 7.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 7.
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