CN114498578B - DC power supply and distribution protection method and device, computer equipment and storage medium - Google Patents
DC power supply and distribution protection method and device, computer equipment and storage medium Download PDFInfo
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- CN114498578B CN114498578B CN202111628898.3A CN202111628898A CN114498578B CN 114498578 B CN114498578 B CN 114498578B CN 202111628898 A CN202111628898 A CN 202111628898A CN 114498578 B CN114498578 B CN 114498578B
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- 230000000875 corresponding effect Effects 0.000 claims description 54
- 230000001276 controlling effect Effects 0.000 claims description 19
- 230000009471 action Effects 0.000 claims description 14
- 238000004146 energy storage Methods 0.000 claims description 14
- 238000004590 computer program Methods 0.000 claims description 7
- 230000006870 function Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 4
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- RZVAJINKPMORJF-UHFFFAOYSA-N Acetaminophen Chemical compound CC(=O)NC1=CC=C(O)C=C1 RZVAJINKPMORJF-UHFFFAOYSA-N 0.000 description 1
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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
- H02H7/268—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
Abstract
The invention relates to a direct current power supply and distribution protection method, a 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 dc power supply and distribution protection method, apparatus, computer device, and storage medium.
Background
Along with the continuous enrichment of power consumption demands, the low-voltage direct-current power supply and distribution system has become an important direction of power distribution network development because of factors such as the convenience in access of distributed energy sources, relatively longer power supply radius, and the large occurrence of direct-current loads such as charging piles. However, the devices of the dc power supply and distribution system are more complex and diverse than the ac system, and the presence of a large number of power electronic devices presents a greater challenge for relay protection of the dc system.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a dc power supply and distribution protection method, apparatus, computer device, and storage medium.
The utility model provides a direct current power supply and distribution protection method, is applied to low voltage direct current power supply and distribution system, power supply and distribution system includes main circuit and branch circuit, main circuit includes the first protection device that is used for being connected with generating line, alternating current network, branch circuit includes with the second protection device that generating line is connected and with the power supply unit that second protection device is connected, includes:
acquiring current information flowing through the main circuit and the branch circuit;
acquiring 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 distribution fault position information.
In one embodiment, the obtaining the power 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 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, obtaining the power distribution fault location information according to the current information and the 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 the second fault location information when the current information of the branch circuit does not meet 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;
and generating second fault position information when the ratio of the overcurrent flowing through the branch circuit to the rated current is larger than the preset ratio.
In one embodiment, the controlling the first protection device and/or the second protection device to perform corresponding actions according to the 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:
acquiring the direct current voltage of the output side of the first protection device;
when the output side direct current voltage is lower than a 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 output current amplitude of the first protection device.
The utility model provides a direct current supplies distribution protection device, is applied to low-voltage direct current power supply distribution system, power supply distribution system includes main circuit and branch circuit, main circuit includes the first protection device that is used for being connected with generating line, alternating current network, branch circuit include with the second protection device that the generating line is connected and with the power supply unit that the second protection device is connected, include:
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 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 perform the steps of the method as described above.
A computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of a 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 computer equipment and the storage medium, the current information flowing through the main circuit and the branch circuit is obtained, the 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 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 relayed 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 that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method of DC power supply and distribution protection 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 chart of a method of DC power supply and distribution protection in one embodiment;
FIG. 4 is a flow chart of a method of DC power supply and distribution protection in one embodiment;
FIG. 5 is a block diagram of a DC power supply and distribution protection device in one embodiment;
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 will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
It will be understood that the terms "first," "second," and the like, as used herein, may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one 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 the present application. Both the first client and the second client are clients, but they are not the same client. Also, the term "and/or" as used in this specification includes any and all combinations of the associated listed items.
Referring to fig. 1, a flowchart of a dc power supply and distribution protection method in one 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 the bus and the 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 structure of a low-voltage dc power supply and distribution system in one embodiment is shown. As shown in fig. 2, the main circuit comprises a first protection device for connection with a busbar, an AC power grid, and also comprises an AC/DC converter branch, a busbar circuit, and the AC/DC converter branch, i.e. the connection circuit between the AC power grid and the busbar; the branch circuit comprises a second protection device connected with the bus and a power supply device connected with the second protection device, and also comprises a DC/DC converter branch, namely a connecting circuit between the power supply device and the bus; the number of the 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 comprises a DC/DC converter connected with the second protection device, a distributed power supply, a direct current energy storage device and a direct current 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.
Wherein the first protection means comprises an AC/DC converter and/or a mechanical direct current breaker arranged in a branch of the AC/DC converter, the AC/DC converter being arranged with a fault ride through function; the second protection device comprises a mechanical direct current breaker arranged in a branch of the DC/DC converter. Specifically, when a current fault exists in the branch circuit, the tripper of the mechanical direct current breaker generally breaks the current through a thermal trip or magnetic trip principle, and the action characteristic of the tripper has the characteristic of inverse time limit: the larger the short-circuit current, the shorter the on-time.
The current information of the main circuit comprises current amplitude information of a bus and current amplitude information of a connecting circuit between an alternating current power grid and the bus; the current information of the branch circuit comprises current amplitude information of a connecting circuit between the bus and the distributed power supply device, current amplitude information of a connecting circuit between the bus and the direct current energy storage device and current amplitude information of a connecting 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 to perform current detection through a current measuring device, such as a current needle, a universal meter and the like.
And 104, acquiring the distribution fault position information according to the current information and the corresponding preset current information.
Optionally, the preset current information includes preset current amplitude information of a bus, preset current amplitude information of a connection circuit between the ac power grid and the bus, preset current amplitude information of a connection circuit between the bus and the distributed power supply device, and preset current amplitude information of a connection circuit between the bus and the load device.
The method for obtaining the power distribution fault position information can be determined by comparing the relation between the actual current information and the corresponding preset current information. Specifically, whether the 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 current flowing through the bus bar is compared to a preset magnitude of current flowing through the bus bar to determine if a power distribution fault exists in the bus bar.
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 current amplitude of the connection circuit between the actually measured bus bar and the distributed power supply device, the preset current amplitude relationship flowing through the connection circuit between the bus bar and the distributed power supply device are compared to determine whether or not there is a power distribution failure in the connection circuit between the bus bar and the distributed power supply device.
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 action according to the power distribution fault position information may be that a power distribution protection instruction is generated according to the power distribution fault position information, and the power distribution protection instruction is used to control the first protection device, the second protection device or the first protection device and the second protection device to perform direct current power distribution protection action so as to cut off the power distribution fault.
According to the direct current power supply and distribution protection method, through obtaining current information flowing through the main circuit and the branch circuit, power distribution fault position information is obtained according to the current information and 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 quick cutting and relay protection of short-circuit faults at different positions of a low-voltage direct current power supply and distribution system are achieved under the condition that digital protection is not added.
In one embodiment, step 104 includes generating first fault location information indicating that the primary circuit has a power distribution fault when the current information of the primary circuit does not satisfy the corresponding preset current information.
The first fault location information comprises distribution fault location information in a bus and distribution fault location information in a connecting circuit between an alternating current power grid and the bus.
And when the actually measured current amplitude flowing through the main circuit does not meet the preset current amplitude flowing through the main circuit, generating first fault position information, wherein the first fault position information is used for indicating that a power distribution fault exists in the main circuit, namely specific position information of the power distribution fault. For example, when the actually measured current amplitude information flowing through the connection circuit between the ac power grid and the bus bar does not satisfy the preset current amplitude flowing through the connection circuit between the ac power grid and the bus bar, first fault location information is generated, and the first fault location information is used for indicating that a power distribution fault exists in the connection circuit between the ac power grid and the bus bar, that is, the specific location information of the power distribution fault is the connection circuit between the ac power grid and the bus bar.
In one embodiment, step 106 includes controlling the first protection device to perform a failsafe action based on the first failure 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, generating first fault position information, wherein 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 distribution faults existing in the main circuit. For example, when the actually measured current amplitude information flowing through the connection circuit between the alternating current power grid and the bus does not meet the preset current amplitude flowing through the connection circuit between the alternating current power grid and the bus, generating first fault location information, controlling the AC/DC converter to stop after the power distribution fault ride-through time is finished according to the first fault location information, and further achieving relay protection of the power distribution system.
In one embodiment, step 104 further includes generating second fault location information indicating that the branch circuit has a distribution fault when the current information of the branch circuit does not satisfy the corresponding preset current information.
The second fault position information comprises power distribution fault position information in a connecting circuit between the bus and the distributed power supply device, power distribution fault position information in a connecting circuit between the bus and the direct-current energy storage device and power distribution fault position information in a connecting circuit between the bus and the load device.
And when the actually measured current amplitude flowing through the branch circuit does not meet the preset current amplitude flowing through the branch circuit, 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 actually measured current amplitude information flowing through the connection circuit between the bus and the dc energy storage device does not meet the preset current amplitude flowing through the connection circuit between the bus and the dc energy storage device, second fault location information is generated, where 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.
Referring to fig. 3, a flowchart of a dc power supply and distribution protection method in one embodiment is shown. The direct current power supply and distribution protection method relates to a refinement step of a specific process for generating second fault position information when 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.
Step 302, a preset ratio of the capacity of the first protection device to the capacity of the power supply device is obtained.
Optionally, the preset ratio of the first protection device capacity to the power supply device capacity refers to a ratio of the AC/DC converter rated power to the power supply device rated power. The rated power of the power supply device can be the sum of the rated powers of the distributed power supply, the direct current energy storage device and 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 rated power of the AC/DC converter to the sum of rated powers of the distributed power supply, the direct current energy storage device and the direct current load device; the action of the molded case circuit breaker presents inverse time limit characteristics, the larger the overcurrent multiple is, the faster the action is, and conversely, the smaller the overcurrent multiple is, the slower the action is, the ratio design reference value is generally not less than 8, and the ten-to-twenty-millisecond rapid action can be realized under the condition that the general molded case circuit breaker is over-current with eight times of rated current.
Step 304, when the ratio of the over-current flowing through the branch circuit to the rated current is greater than the preset ratio, generating the second fault location information.
And when the ratio of the actually measured current amplitude flowing through the branch circuit to the preset rated current amplitude is larger 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 direct-current energy storage device and the direct-current load device, second fault position information is generated, wherein the second fault position information indicates that the connection circuit between the bus and the distributed power supply device has a power distribution fault, namely the specific position 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 failsafe 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, 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; and then controlling the second protection device to perform fault protection action according to the second fault position information so as to cut off the distribution faults 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 meet the preset current amplitude flowing through the connection circuit between the bus and the distributed power supply device, second fault location information is generated, and then the 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 location information, so that power distribution faults are removed, and relay protection of the system is achieved.
Referring to fig. 4, a flowchart of a dc power supply and distribution protection method in one embodiment is shown. Based on 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 output side dc voltage of the first protection device.
Alternatively, the first protection device output side DC voltage may be an AC/DC converter output side DC voltage magnitude.
Step 404, when the output side dc voltage is lower than the corresponding preset voltage, generating a working mode switching command.
Step 406, according to the operation mode switching command, the operation mode of the first protection device is switched to adjust the output current amplitude 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 DC output side has the short circuit fault and generates an AC/DC converter working mode switching instruction; and switching the working mode of the converter according to the working mode switching instruction, namely switching to limit current output and keeping the working mode for a period of time, if the output side direct current voltage is continuously lower than the corresponding preset voltage after the period of current limiting output time, stopping the AC/DC converter, and completely stopping the whole system to remove the power distribution fault so as to realize relay protection of the system. Optionally, the duration of the current limited output is adjustable, typically in the order of seconds, not exceeding 5 seconds.
According to the direct current power supply and distribution protection method, the direct current voltage of the output side of the first protection device is obtained, when the direct current voltage of 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 output current amplitude of the first protection device, so that relay protection is carried out on a low-voltage direct current power supply and distribution system under the condition that digital protection is not added.
It should be understood that, although the steps in the flowcharts of fig. 1 and 3-4 are shown in order according to the order indicated by the arrows, these steps are not necessarily performed in order according to the order indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps of fig. 1 and 3-4 may include multiple sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, nor does the order in which the sub-steps or stages are performed necessarily occur sequentially, but may be performed alternately or alternately with other steps or at least a portion of the sub-steps or stages of other steps. It should be noted that the above-described different embodiments may be combined with each other.
Referring to fig. 5, a block diagram of a dc power supply and distribution protection device in one embodiment is shown.
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 acquisition module 502, a fault information acquisition module 504, and a control protection module 506.
The current information acquisition module 502 is configured to acquire current information flowing through the main circuit and the branch circuit.
The fault information obtaining module 504 is configured to obtain 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 configured to execute each step in the corresponding embodiment in fig. 1, and specifically refer 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, current information flowing through the main circuit and the branch circuit is obtained through the current information obtaining module 502, the fault information obtaining module 504 obtains distribution fault position information according to the current information and 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 distribution fault position information, so as to implement rapid removal and relay protection of short-circuit faults at different positions of the low-voltage dc power supply and distribution system under the condition that digital protection is not added.
On the basis of the above embodiment, as shown in fig. 6, the dc power supply and distribution protection device further includes: a direct current 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 of the output side of the first protection device.
The switching instruction generating module 604 is configured to generate an operation mode switching instruction when the output side dc voltage is lower than a corresponding preset voltage.
The switching control module 606 is configured to switch the operation mode of the first protection device according to the operation mode switching instruction so as to adjust the output current amplitude of the first protection device.
In this embodiment, each module is configured to execute each step in the corresponding embodiment in fig. 4, and specifically refer to fig. 4 and related descriptions in the corresponding embodiment in fig. 4, which are not repeated herein.
According to the direct current power supply and distribution protection method provided by the embodiment, the direct current voltage of the output side of the first protection device is obtained through the direct current voltage obtaining module 602, when the direct current of the output side is lower than the corresponding preset voltage, the switching instruction generating module 604 generates a working mode switching instruction, and the switching control module 606 switches the working mode of the first protection device according to the working mode switching instruction so as to adjust the output current amplitude of the first protection device, so that relay protection is performed on the low-voltage direct current power supply and distribution system under the condition that digital protection is not added.
The above-mentioned division of each module in the dc power supply and distribution protection device is only used for illustration, and in other embodiments, the dc power supply and distribution protection device may be divided into different modules as required to complete all or part of the functions of the dc power supply and distribution protection device.
The specific limitation of the dc power supply and distribution protection device can be referred to the limitation of the dc power supply and distribution protection method hereinabove, and will not be described herein. All or part of each module in the direct current power supply and distribution protection device can be realized by software, hardware and a combination thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
The embodiment of the application further provides a computer device, which comprises a memory and a processor, wherein the memory stores a computer program, and the computer program when executed by the processor causes the processor to execute the steps of the method in the embodiment.
A computer-readable storage medium is also provided in an embodiment of the present application. 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 a direct current 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 by the embodiment realize rapid removal and relay protection of short circuit faults at different positions of the low-voltage direct current power supply and distribution system under the condition that digital protection is not additionally arranged, and have important economic value and popularization and practice value.
Any reference to memory, storage, database, or other medium used herein may include non-volatile and/or volatile memory. The nonvolatile 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 DRAM (SLDRAM), memory bus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. The direct current power supply and distribution protection method is applied to a low-voltage direct current 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 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, and is characterized in that the first protection device comprises an AC/DC converter and a mechanical direct current breaker, the AC/DC converter is provided with a fault traversing function, the second protection device comprises a mechanical direct current breaker, and a thermal trip or a magnetic trip is arranged on the mechanical direct current breaker; the ratio of the rated power of the AC/DC converter to the rated power of the power supply device is more than or equal to 8, wherein the rated power of the power supply device is used for representing the sum of the rated powers of a distributed power supply, a direct current energy storage device and a direct current load device in the power supply device; the method comprises the following steps:
acquiring current information flowing through the main circuit and the branch circuit;
acquiring distribution fault position information according to the current information and corresponding preset current information;
controlling the first protection device and/or the second protection device to perform corresponding actions according to the distribution fault position information;
the method further comprises the steps of:
acquiring the direct current voltage of the output side of the first protection device;
when the output side direct current voltage is lower than a corresponding preset voltage, the AC/DC converter generates a working mode switching instruction;
and according to the working mode switching instruction, the AC/DC converter switches the working mode to adjust the amplitude of the output current of the AC/DC converter and keep the amplitude of the output current for a preset time.
2. The method according to claim 1, wherein the obtaining 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.
3. The method according to claim 2, wherein said controlling the first protection device and/or the second protection device to perform the corresponding actions according to the 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 the 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;
and generating second fault position information when the ratio of the overcurrent flowing through the branch circuit to the rated current is larger than the preset ratio.
6. The method of claim 4, wherein controlling the first protection device and/or the second protection device to perform a corresponding action based on 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 direct current power supply and distribution protection device is applied to a low-voltage direct current 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 alternating current 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 direct current power supply and distribution protection device is characterized in that the first protection device comprises an AC/DC converter and a mechanical direct current breaker, the AC/DC converter is provided with a fault ride-through function, the second protection device comprises a mechanical direct current breaker, and a thermal trip or a magnetic trip is arranged on the mechanical direct current breaker; the ratio of the rated power of the AC/DC converter to the rated power of the power supply device is more than or equal to 8, wherein the rated power of the power supply device is used for representing the sum of the rated powers of a distributed power supply, a direct current energy storage device and a direct current load device in the power supply device; the 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;
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 distribution fault position information;
the apparatus further comprises:
the direct-current voltage acquisition module is used for acquiring the direct-current voltage at the output side of the first protection device;
the switching instruction generation module is used for generating a working mode switching instruction by the AC/DC converter when the output side direct current voltage is lower than a corresponding preset voltage;
and the switching control module is used for switching the working mode according to the working mode switching instruction, so as to adjust the output current amplitude of the AC/DC converter and keep the output current amplitude for a preset time.
8. The apparatus of claim 7, wherein the fault information acquisition module, when executing the acquisition of the power distribution fault location information from the current information and the corresponding preset current information, is configured to:
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.
9. 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 perform the steps of the method of any of claims 1 to 6.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method according to any one of claims 1 to 6.
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