CN114498578A - DC power supply and distribution protection method, device, computer equipment and storage medium - Google Patents

Abstract

The invention relates to a DC power supply and distribution protection method, device, computer equipment and storage medium. By acquiring current information flowing through a main circuit and a branch circuit, and obtaining power distribution fault location information according to the current information and corresponding preset current information, The fault location information controls the first protection device and/or the second protection device to perform corresponding actions to realize rapid removal and relay protection of short-circuit faults at different positions in the low-voltage DC power supply and distribution system without adding digital protection.

Description

DC power supply and distribution protection method, device, computer equipment and storage medium

technical field

The invention relates to the field of DC power supply and distribution, in particular to a protection method, device, computer equipment and storage medium for DC power supply and distribution.

Background technique

With the continuous enrichment of electricity demand, the low-voltage DC power supply and distribution system has become more and more popular due to factors such as its convenient access to distributed energy, relatively longer power supply radius, and the emergence of a large number of DC loads such as charging piles. The usage scenarios are becoming more and more common, and it has become an important direction for the development of the distribution network. However, compared with the AC system, the equipment of the DC power supply and distribution system is more complex and diverse, and the existence of a large number of power electronic equipment brings greater challenges to the relay protection of the DC system.

SUMMARY OF THE INVENTION

Based on this, it is necessary to provide a DC power supply and distribution protection method, device, computer equipment and storage medium for the above technical problems.

A DC power supply and distribution protection method is applied to a low-voltage DC power supply and distribution system, wherein the power supply and distribution system includes a main circuit and a branch circuit, the main circuit includes a first protection device for connecting with a bus bar and an AC power grid, The branch circuit includes a second protection device connected to the bus bar and a power supply device connected to the second protection device, including:

Obtain current information flowing through the main circuit and the branch circuit;

Obtaining power distribution fault location information according to the current information and the corresponding preset current information;

Control the first protection device and/or the second protection device to perform corresponding actions according to the power distribution fault location information.

In one embodiment, the obtaining power distribution fault location information according to the current information and corresponding preset current information includes:

When the current information of the main circuit does not satisfy the corresponding preset current information, first fault location information is generated, and the first fault location information indicates that there is a power distribution fault in the main circuit.

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:

The first protection device is controlled to perform a fault protection action according to the first fault location information.

In one of the embodiments, obtaining power distribution fault location information according to the current information and corresponding preset current information includes:

When the current information of the branch circuit does not satisfy the corresponding preset current information, second fault location information is generated, and the second fault location information indicates that the branch circuit has a power distribution fault.

In one embodiment, the generating the second fault location information when the current information of the branch circuit does not satisfy the corresponding preset current information includes:

obtaining a preset ratio between the capacity of the first protection device and 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, the 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:

The second protection device is controlled to perform a fault protection action according to the second fault location information.

In one embodiment, it also includes:

obtaining the DC voltage at the output side of the first protection device;

When the output side DC voltage is lower than the corresponding preset voltage, generating a working mode switching instruction;

According to the operating mode switching instruction, the operating mode of the first protection device is switched to adjust the output current amplitude 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 includes a main circuit and a branch circuit, the main circuit includes a first protection device for connecting with a bus bar and an AC power grid, The branch circuit includes a second protection device connected to the bus bar and a power supply device connected to the second protection device, including:

a current information acquisition module, configured to acquire current information flowing through the main circuit and the branch circuit;

a fault information acquisition module, configured to acquire power distribution fault location information according to the current information and the corresponding preset current information;

A control protection module, configured to control the first protection device and/or the second protection device to perform corresponding actions according to the power distribution fault location information.

A computer device includes a memory and a processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the processor executes the steps of the above method.

A computer-readable storage medium having a computer program stored thereon, the computer program implementing the steps of the above-described method when executed by a processor.

The above-mentioned DC power supply and distribution protection method, device, computer equipment and storage medium, by obtaining current information flowing through the main circuit and branch circuit, obtaining power distribution fault location information according to the current information and corresponding preset current information, and according to the power distribution fault position The information controls the first protection device and/or the second protection device to perform corresponding actions to realize quick removal and relay protection of short-circuit faults at different positions in the low-voltage DC power supply and distribution system without adding digital protection.

Description of drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

1 is a flowchart of a DC power supply and distribution protection method in one embodiment;

2 is a schematic structural diagram of a low-voltage DC power supply and distribution system in an embodiment;

3 is a flowchart of a DC power supply and distribution protection method in one embodiment;

4 is a flowchart of a DC power supply and distribution protection method in one embodiment;

5 is a structural block diagram of a DC power supply and distribution protection device in one embodiment;

FIG. 6 is a structural block diagram of a DC power supply and distribution protection device in one embodiment.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application will be described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application.

It will be understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. 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 this 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 , it is a flowchart of a DC power supply and distribution protection method in one embodiment.

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; wherein, the main circuit includes a first circuit for connecting to a bus bar and an AC power grid. A protection device, the branch circuit includes a second protection device connected to the busbar and a power supply device connected to the second protection device. As shown in FIG. 1 , the DC power supply and distribution protection method includes steps 102 to 106 .

Step 102: Acquire current information flowing through the main circuit and the branch circuit.

Optionally, referring to FIG. 2 , it is a schematic structural diagram of a low-voltage DC power supply and distribution system in an embodiment. As shown in Figure 2, the main circuit includes a first protection device for connecting with the busbar and the AC power grid, and also includes an AC/DC converter branch and a busbar circuit, and the AC/DC converter branch is the AC power grid and the AC power grid. The connection circuit between the busbars; the branch circuit includes a second protection device connected to the busbar and a power supply device connected to the second protection device, and also includes a DC/DC converter branch, and the DC/DC converter branch is the power supply The connection circuit between the device and the bus bar; the number of branch circuits is multiple, each branch circuit corresponds to a power supply device, and the power supply devices of different branch circuits are the same or different. Each power supply device includes a DC/DC converter connected to the second protection device, and also includes a distributed power source, a DC energy storage device, and a DC load device. Wherein, the distributed power source includes photovoltaic power source; the DC energy storage device includes DC energy storage battery.

Wherein, the first protection device includes an AC/DC converter and/or a mechanical DC circuit breaker configured in a branch of the AC/DC converter, and the AC/DC converter is configured with a fault ride-through function; Two protection devices, including mechanical DC circuit breakers configured in the DC/DC converter branches. Specifically, when there is a current fault in the branch circuit, the release of the mechanical DC circuit breaker generally breaks the current through the principle of thermal tripping or magnetic tripping, and its operating characteristics have the characteristics of inverse time limit: the greater the short-circuit current, the more The shorter the interruption time.

Wherein, the current information of the main circuit includes the current amplitude information flowing through the busbar and the current amplitude information flowing through the connecting circuit between the AC grid and the busbar; the current information of the branch circuit includes the current flowing between the busbar and the distributed power source device. The current amplitude information of the connecting circuit, the current amplitude information flowing through the connecting circuit between the busbar and the DC energy storage device, and the current amplitude information flowing through the connecting circuit between the busbar and the load device.

The method of obtaining the current information flowing through the main circuit and the branch circuit may be to perform current detection through a current measuring device, such as a current needle, a multimeter, and the like.

Step 104: Acquire power distribution fault location information according to the current information and the corresponding preset current information.

Optionally, the preset current information includes preset information on the amplitude of the current flowing through the bus, preset information on the amplitude of the current flowing through the connection circuit between the AC grid and the bus, and the preset information on the current flowing between the bus and the distributed power supply device. The preset information of the current amplitude of the connection circuit and the preset information of the current amplitude flowing through the connection circuit between the bus bar and the load device.

Wherein, the method for obtaining the position information of the power distribution fault may be determined by comparing the relationship between the actual current information and the corresponding preset current information. Specifically, whether there is a power distribution fault in the main circuit is determined by comparing the relationship between the actually measured amplitude of the current flowing through the main circuit and the preset amplitude value of the current flowing through the main circuit. For example, the relationship between the actual measured current amplitude flowing through the busbar and the preset current amplitude value flowing through the busbar is compared to determine whether there is a power distribution fault in the busbar.

In addition, whether there is a power distribution fault in the branch circuit is determined by comparing the relationship between the actual measured current amplitude flowing through the branch circuit and the preset current amplitude value flowing through the branch circuit. For example, compare the actual measured current amplitude of the connection circuit between the bus bar and the DG device, and the relationship between the preset current amplitudes flowing through the connection circuit between the bus bar and the DG device to determine the relationship between the bus bar and the DG device. Whether there is a power distribution fault in the connecting circuit between the units.

Step 106: Control the first protection device and/or the second protection device to perform corresponding actions according to the power distribution fault location information.

Wherein, the method of controlling the first protection device and/or the second protection device to perform corresponding actions according to the position information of the power distribution fault may be to generate a power distribution protection instruction according to the position information of the power distribution fault, and use the power distribution protection instruction to control the first protection device, The second protection device or the first protection device and the second protection device perform a DC power distribution protection action to remove the power distribution fault.

In the DC power supply and distribution protection method provided in this embodiment, the information on the current flowing through the main circuit and the branch circuit is obtained, the information on the position of the power distribution fault is obtained according to the current information and the corresponding preset current information, and the information on the position of the power distribution fault is controlled according to the position information of the power distribution fault. A protection device and/or a second protection device perform corresponding actions to achieve rapid removal and relay protection of short-circuit faults at different positions in the low-voltage DC power supply and distribution system without adding digital protection.

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, and the first fault location information indicates that there is a power distribution fault in the main circuit.

Wherein, the first fault location information includes power distribution fault location information in the busbar, and power distribution fault location information in the connection circuit between the AC grid and the busbar.

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 location information is generated, where the first fault location information is used to indicate that there is a power distribution fault in the main circuit , that is, the specific location information of the power distribution fault. For example, when the actually measured current amplitude information flowing through the connection circuit between the AC grid and the bus does not meet the preset current amplitude flowing through the connection circuit between the AC grid and the bus, the first fault location information is generated, At this time, the first fault location information is used to indicate that there is a power distribution fault in the connection circuit between the AC power grid and the bus, that is, the specific position 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 according to 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 location information is generated, where the first fault location information is used to indicate that there is a presence in the main circuit power distribution fault; and then control the first protection device to perform fault protection action according to the first fault location information to remove the power distribution fault existing in the main circuit. For example, when the actually measured current amplitude information flowing through the connection circuit between the AC grid and the bus does not meet the preset current amplitude flowing through the connection circuit between the AC grid and the bus, the first fault location information is generated, Then, according to the first fault location information, the AC/DC converter is controlled to stop after the power distribution fault ride-through time expires, thereby realizing the relay protection of the power distribution system.

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, where the second fault location information indicates that the branch circuit has a power distribution fault.

Wherein, the second fault location information includes distribution fault location information in the connection circuit between the busbar and the distributed power supply device, distribution fault location information in the connection circuit between the busbar and the DC energy storage device, and the connection between the busbar and the load device. Information on the location of power distribution faults in the connected circuit.

When the actually measured amplitude of the current flowing through the branch circuit does not meet the preset amplitude of the current flowing through the branch circuit, second fault location information is generated, where the second fault location information is used to indicate that there is a power distribution fault in the branch circuit , that is, the specific location information of the power distribution fault. For example, when the actually measured current amplitude information flowing through the connection circuit between the bus bar and the DC energy storage device does not meet the preset current amplitude flowing through the connection circuit between the bus bar and the DC energy storage device, the second Fault location information. At this time, the second fault location information is used to indicate that there is a power distribution fault in the connection circuit between the busbar and the DC energy storage device, that is, the specific location information of the power distribution fault is located between the busbar and the DC energy storage device. Connect the circuit.

Referring to FIG. 3 , it is a flowchart of a DC power supply and distribution protection method in one embodiment. The DC power supply and distribution protection method is a refinement step of the specific process of generating the second fault location information when the current information of the branch circuit does not satisfy the corresponding preset current information. As shown in FIG. 3 , the DC power supply and distribution protection method includes steps 302 to 304 .

Step 302: Obtain a preset ratio between the capacity of the first protection device and the capacity of the power device.

Optionally, the preset ratio between the capacity of the first protection device and the capacity of the power supply device refers to the ratio of the rated power of the AC/DC converter to the rated power of the power supply device. Among them, the rated power of the power supply device can be the sum of the rated power of the distributed power supply, the DC energy storage device, and the DC load device. Specifically, the preset ratio of the capacity of the first protection device to the capacity of the power supply device may be the ratio of the rated power of the AC/DC converter to the sum of the rated power of the distributed power source, the DC energy storage device, and the DC load device; The action of the molded case circuit breaker presents an inverse time characteristic. The larger the overcurrent multiple is, the faster the action is, and the smaller the overcurrent multiple is, the slower the action is. The design reference value of this ratio is generally not less than 8, which is based on the general molded case circuit breaker. The device can achieve a fast action of ten to twenty milliseconds at eight times the rated current overcurrent.

Step 304 , when the ratio of the overcurrent flowing through the branch circuit to the rated current is greater than a preset ratio, generate second fault location information.

When the ratio of the actual measured current amplitude flowing through the branch circuit to the preset rated current amplitude is greater than the preset ratio between the capacity of the second protection device and the capacity of the power supply device, second fault location information is generated, and the second fault location information is It is used to indicate that there is a power distribution fault in the branch circuit, that is, the specific location information of the power distribution fault.

For example, the ratio of the actual measured current amplitude flowing through the connection circuit between the busbar and the distributed power supply device to the corresponding preset rated current amplitude is greater than the rated power of the AC/DC converter and the distributed power supply and DC energy storage. When the ratio of the sum of the rated power of the device and the DC load device, the second fault location information is generated, and the second fault location information indicates that there is a power distribution fault in the connection circuit between the busbar and the distributed power device, that is, the specific power distribution fault The location information is the connection circuit between the busbar and the distributed power supply unit.

In one embodiment, step 106 includes controlling the second protection device to perform a fault protection action according to the second fault location information.

Specifically, when the actually measured amplitude of the current flowing through the branch circuit does not meet the preset amplitude of the current flowing through the branch circuit, second fault location information is generated, where the second fault location information is used to indicate that there is a presence in the branch circuit power distribution fault; and then control the second protection device to perform fault protection action according to the second fault location information to remove 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 bar and the distributed power source device does not satisfy the preset current amplitude value flowing through the connection circuit between the bus bar and the distributed power source device, the second If the fault location information is obtained, the branch circuit breaker configured in the connection circuit between the bus bar and the distributed power supply device is controlled to trigger selective action according to the second fault location information, so as to remove the distribution fault and realize the relay protection of the system.

Referring to FIG. 4 , it is a flowchart of a DC power supply and distribution protection method in one embodiment. 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 .

Step 402: Obtain the DC voltage of the output side of the first protection device.

Optionally, the DC voltage at the output side of the first protection device may be the DC voltage amplitude at the output side of the AC/DC converter.

Step 404 , when the DC voltage on the output side is lower than the corresponding preset voltage, a working mode switching instruction is generated.

Step 406 , according to the working mode switching instruction, switch the working mode of the first protection device to adjust the output current amplitude of the first protection device.

When a short-circuit fault occurs in the AC/DC converter branch, the actually measured DC voltage amplitude at the output side of the AC/DC converter is lower than the corresponding preset voltage amplitude, and the AC/DC converter determines that the DC output A short-circuit fault occurs on the side, and the AC/DC converter working mode switching command is generated; the inverter working mode is switched according to the working mode switching command, that is, it switches to the current-limited output and maintains this working mode for a period of time. After the current output time, the DC voltage on the output side continues to be lower than the corresponding preset voltage, the AC/DC converter will stop, and the entire system will be completely stopped, so as to remove the power distribution fault and realize the relay protection of the system. Optionally, the duration of the current-limiting output is adjustable, generally in the order of seconds, not more than 5 seconds.

In the DC power supply and distribution protection method provided in this embodiment, by acquiring the DC voltage at the output side of the first protection device, when the DC 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 first switching instruction is switched. A protection device working mode is used to adjust the output current amplitude of the first protection device, so as to realize the relay protection of the low-voltage direct current power supply and distribution system without adding digital protection.

It should be understood that although the steps in the flowcharts of FIG. 1 and FIG. 3 to FIG. 4 are displayed in sequence according to the arrows, these steps are not necessarily executed in sequence according to the sequence of the arrows. Unless explicitly stated herein, the execution of these steps is not strictly limited to the order, and these steps may be performed in other orders. Moreover, at least a part of the steps in FIG. 1 and FIG. 3-FIG. 4 may include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily executed at the same time, but may be executed at different times. The order of execution of the sub-steps or phases is also not necessarily sequential, but may be performed alternately or alternately with other steps or at least a portion of the sub-steps or phases of the other steps. It should be noted that, the above-mentioned different embodiments may be combined with each other.

Referring to FIG. 5 , it is a structural block diagram of a DC power supply and distribution protection device in one embodiment.

In this embodiment, the 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 includes a main circuit and a branch circuit. The main circuit includes a first protection device for connecting to the busbar and the AC power grid. The branch circuit It includes a second protection device connected to the bus bar and a power supply device connected to the second protection device. The DC power supply and distribution protection device includes a current information acquisition module 502 , a fault information acquisition module 504 and a control protection module 506 .

The current information acquisition module 502 is used for acquiring current information flowing through the main circuit and the branch circuit.

The fault information acquisition module 504 is configured to acquire power distribution fault location information according to the current information and the corresponding preset current information.

The control protection module 506 is configured to control 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 embodiment corresponding to FIG. 1 . For details, please refer to the relevant description in FIG. 1 and the corresponding embodiment in FIG. 1 , which will not be repeated here.

In the DC power supply and distribution protection device provided in this embodiment, the current information passing through the main circuit and the branch circuit is obtained by the current information obtaining module 502, and the fault information obtaining module 504 obtains the power distribution fault location according to the current information and the corresponding preset current information information, 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 as to realize short-circuiting at different positions of the low-voltage DC power supply and distribution system without adding digital protection. Fast fault removal and relay 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 acquisition module 602 , a switching instruction generation module 604 and a switching control module 606 .

The DC voltage obtaining module 602 is configured to obtain the DC voltage at the output side of the first protection device.

The switching instruction generation module 604 is configured to generate a working mode switching instruction when the DC voltage at the output side is lower than the corresponding preset voltage.

The switching control module 606 is configured to switch the working mode of the first protection device to adjust the output current amplitude of the first protection device according to the working mode switching instruction.

In this embodiment, each module is used to execute each step in the embodiment corresponding to FIG. 4 . For details, please refer to the relevant description in FIG. 4 and the embodiment corresponding to FIG. 4 , which will not be repeated here.

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 through the DC voltage acquisition module 602, and the switching instruction generation module 604 generates an operating mode switch when the DC voltage at the output side is lower than the corresponding preset voltage instruction, the switching control module 606 switches the working mode of the first protection device to adjust the output current amplitude of the first protection device according to the working mode switching instruction, so as to realize the operation of the low-voltage DC power supply and distribution system without adding digital protection. Relay protection.

The division of each module in the above-mentioned DC power supply and distribution protection device is only used for illustration. full or partial functionality.

For the specific limitation of the DC power supply and distribution protection device, reference may be made to the limitation of the DC power supply and distribution protection method above, which will not be repeated here. Each module in the above-mentioned DC power supply and distribution protection device can be implemented in whole or in part by software, hardware and combinations thereof. The above modules can be embedded in or independent of the processor in the computer device in the form of hardware, or stored in the memory in the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

An embodiment of the present application also provides a computer device, including a memory and a processor, where a computer program is stored in the memory, and when the computer program is executed by the processor, the processor executes the steps of the method in the foregoing embodiments.

The embodiments of the present application also provide a computer-readable storage medium. One or more non-volatile computer-readable storage media containing computer-executable instructions, when the computer-executable instructions are executed by one or more processors, cause the processors to perform the steps of the DC power supply and distribution protection method.

The DC power supply and distribution protection method, device, computer equipment and storage medium provided in the above-mentioned embodiments can quickly remove and relay short-circuit faults at different positions in the low-voltage DC power supply and distribution system without adding digital protection. Protection has important economic value and practical value for promotion.

Any reference to a memory, storage, database, or other medium as used herein may include non-volatile and/or volatile memory. Nonvolatile memory may include read only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RAM), which acts as external cache memory. By way of illustration and not limitation, RAM is available in various 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), Memory Bus (Rambus) Direct RAM (RDRAM), Direct Memory Bus Dynamic RAM (DRDRAM), and Memory Bus Dynamic RAM (RDRAM).

The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be regarded as the scope described in this specification.

The above-mentioned embodiments only represent several embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as a limitation on the scope of the invention patent. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can also be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should 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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