CN112510644B - Short circuit protection method and device for UPS parallel operation system and UPS - Google Patents
Short circuit protection method and device for UPS parallel operation system and UPS Download PDFInfo
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- CN112510644B CN112510644B CN202011281110.1A CN202011281110A CN112510644B CN 112510644 B CN112510644 B CN 112510644B CN 202011281110 A CN202011281110 A CN 202011281110A CN 112510644 B CN112510644 B CN 112510644B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0061—Details of emergency protective circuit arrangements concerning transmission of signals
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
Abstract
The application is applicable to the technical field of parallel operation systems, and discloses a short circuit protection method and device of a UPS parallel operation system and the UPS, wherein the method is applied to any UPS in the UPS parallel operation system and comprises the following steps: when a load short circuit is detected, short circuit protection information is generated, the short circuit protection information is sent to other UPS in the UPS parallel operation system, and short circuit protection is carried out according to the short circuit protection information; the short-circuit protection information is used for indicating each UPS in the UPS parallel operation system to perform short-circuit protection at the same time; and when receiving the short-circuit protection information sent by other UPS in the UPS parallel operation system, carrying out short-circuit protection according to the short-circuit protection information. The application can not generate the phenomenon of short-circuit protection in sequence, so that the phenomenon that a certain UPS bears current far exceeding the self current limiting point in a certain period of time can not generate, the damage of devices in the UPS can be prevented, and the purpose of protecting the devices in the UPS is achieved.
Description
Technical Field
The application belongs to the technical field of parallel operation systems, and particularly relates to a short circuit protection method and device of a UPS parallel operation system and the UPS.
Background
The UPS (Uninterruptible Power Supply ) parallel operation system comprises at least two uninterruptible power supplies which are connected in parallel, and the output of each uninterruptible power supply is configured by a power distribution cabinet to supply power to each load.
The UPS parallel operation system is usually far away from the load, when the load is short-circuited, each UPS cannot detect the short circuit at the same time, so that each UPS performs short-circuit protection successively, whether each UPS is in a short-circuit protection state or not is in a bus freewheeling stage, and therefore the UPS is inevitably in an uneven current phenomenon, and because each UPS performs short-circuit protection successively, the uneven current phenomenon is more obvious, and therefore a certain UPS may bear current far beyond its current limiting point in a certain period of time, and devices in the UPS are damaged.
Disclosure of Invention
In view of the above, embodiments of the present application provide a short-circuit protection method and apparatus for a UPS parallel operation system, and a UPS, so as to solve the problem in the prior art that when a load connected to the UPS parallel operation system is shorted, a certain uninterrupted power source may bear a current far exceeding its current limiting point in a certain period of time, and further damage devices in the uninterrupted power source.
The first aspect of the embodiment of the application provides a short-circuit protection method of a UPS parallel operation system, which is applied to any UPS in the UPS parallel operation system, and comprises the following steps:
when a load short circuit is detected, short circuit protection information is generated, the short circuit protection information is sent to other UPS in the UPS parallel operation system, and short circuit protection is carried out according to the short circuit protection information; the short-circuit protection information is used for indicating each UPS in the UPS parallel operation system to perform short-circuit protection at the same time;
and when receiving the short-circuit protection information sent by other UPS in the UPS parallel operation system, carrying out short-circuit protection according to the short-circuit protection information.
A second aspect of the embodiment of the present application provides a short-circuit protection device for a UPS parallel operation system, where the short-circuit protection device is applied to any one of the UPS parallel operation systems, and the UPS parallel operation system includes:
the information sending module is used for generating short-circuit protection information when the load is detected to be short-circuited, sending the short-circuit protection information to other UPS in the UPS parallel operation system, and carrying out short-circuit protection according to the short-circuit protection information; the short-circuit protection information is used for indicating each UPS in the UPS parallel operation system to perform short-circuit protection at the same time;
and the output closing module is used for carrying out short-circuit protection according to the short-circuit protection information when receiving the short-circuit protection information sent by other UPS in the UPS parallel operation system.
A third aspect of an embodiment of the present application provides a UPS, including a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the short circuit protection method of the UPS parallel operation system according to the first aspect when the computer program is executed by the processor.
A fourth aspect of the embodiments of the present application provides a computer-readable storage medium storing a computer program which, when executed by one or more processors, implements the steps of the short circuit protection method of the UPS parallel system according to the first aspect.
Compared with the prior art, the embodiment of the application has the beneficial effects that: when any UPS in the UPS parallel operation system detects a load short circuit, short circuit protection information is generated, the short circuit protection information is sent to other UPSs in the UPS parallel operation system, and short circuit protection is carried out according to the short circuit protection information; the short-circuit protection information is used for indicating each UPS in the UPS parallel operation system to perform short-circuit protection at the same time; when short-circuit protection information sent by other UPS in the UPS parallel operation system is received, short-circuit protection is carried out according to the short-circuit protection information; the UPS can realize the simultaneous short-circuit protection of all the UPSs of the parallel operation, and the phenomenon of short-circuit protection can not occur successively, so that the phenomenon that a certain UPS bears current far exceeding the current limiting point of the UPS in a certain period of time can not occur, the damage of devices in the UPS can be prevented, and the purpose of protecting the devices in the UPS is achieved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed 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 schematic implementation flow chart of a short-circuit protection method of a UPS parallel operation system according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a UPS parallel operation system according to an embodiment of the present application;
FIG. 3 is a schematic block diagram of a short-circuit protection device of a UPS parallel operation system according to an embodiment of the present application;
fig. 4 is a schematic block diagram of a UPS provided in an embodiment of the application.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
In order to illustrate the technical scheme of the application, the following description is made by specific examples.
Fig. 1 is a schematic implementation flow chart of a short-circuit protection method of a UPS parallel operation system according to an embodiment of the present application, and for convenience of explanation, only a portion related to the embodiment of the present application is shown. The short-circuit protection method of the UPS parallel operation system is applied to any UPS in the UPS parallel operation system, namely, the execution main body of the embodiment of the application can be any UPS in the UPS parallel operation system. As shown in fig. 1, the method may include the steps of:
s101: when a load short circuit is detected, short circuit protection information is generated, the short circuit protection information is sent to other UPS in the UPS parallel operation system, and short circuit protection is carried out according to the short circuit protection information; the short-circuit protection information is used for indicating each UPS in the UPS parallel operation system to perform short-circuit protection at the same time.
Referring to fig. 2, a UPS parallel operation system may include at least two UPS and power distribution cabinets connected in parallel, with the output of each UPS being connected to each load through the power distribution cabinet to power each load.
In the embodiment of the application, when a load is detected to be short-circuited by a certain UPS through the existing method, short-circuit protection information is generated and sent to other UPSs in the UPS parallel operation system, namely the UPSs except for the UPS serving as an execution main body, and meanwhile, the certain UPS performs short-circuit protection according to the short-circuit protection information. Wherein the short circuit protection may be to turn off the output. The short protection information may indicate that each UPS is short-circuited at the same time.
In one embodiment of the application, the short-circuit protection information includes a time at which the short-circuit protection is simultaneously performed;
the short-circuit protection information is used for indicating that each UPS in the UPS parallel operation system performs short-circuit protection at the time of simultaneously performing short-circuit protection.
The short protection information may include a time when each UPS is simultaneously short-circuited. Each UPS may perform short-circuit protection at that time after receiving the short-circuit protection information.
Alternatively, the short-circuit protection information may include a second preset time for short-circuit protection after the second preset time has elapsed. After receiving the short-circuit protection information, the other UPS performs short-circuit protection after a second preset time, and the UPS serving as an execution main body adds communication time with the other UPS and performs short-circuit protection after the second preset time. The communication time with the other UPS may be the time from the transmission of the short protection information to the receipt of the short protection information by the other UPS. The second preset time can be set according to actual requirements.
In an embodiment of the present application, the "sending short-circuit protection information to other UPS in UPS parallel operation system" in S101 may include:
and sending short-circuit protection information to other UPS in the UPS parallel operation system through a CAN (Controller Area Network) bus.
In the embodiment of the application, all the UPSs are connected in parallel through the CAN bus, so that the communication between the UPSs CAN be realized through the CAN bus.
S102: and when receiving the short-circuit protection information sent by other UPS in the UPS parallel operation system, carrying out short-circuit protection according to the short-circuit protection information.
When other UPS preferentially detects the load short circuit, the UPS as the execution main body sends short-circuit protection information, and after receiving the short-circuit protection information, the UPS as the execution main body performs short-circuit protection according to the information.
As can be seen from the above description, the embodiment of the application can realize that each UPS of the parallel operation performs short-circuit protection simultaneously, and the phenomenon of performing short-circuit protection sequentially does not occur, so that the phenomenon that a certain UPS bears current far exceeding its current limit point in a certain period of time does not occur, the damage to devices in the UPS can be prevented, and the purpose of protecting the devices in the UPS is achieved.
In one embodiment of the present application, the step S102 may include the following steps:
when short-circuit protection information sent by other UPS in the UPS parallel operation system is received, detecting whether the self current is larger than a preset current threshold value or not;
and if the detected self current is larger than the preset current threshold value, carrying out short-circuit protection according to the short-circuit protection information.
If a load short circuit is detected by a certain UPS by mistake, parallel operation protection can also occur, and the method does not meet the aim. The current of each UPS must be increased much when a short circuit occurs, but may not necessarily reach the short circuit point because of uneven current flow. Therefore, when short-circuit protection information sent by other UPS in the UPS parallel operation system is received, whether the self current is larger than a preset current threshold value is detected, if yes, short-circuit protection is performed according to the short-circuit protection information, if not, short-circuit protection is not performed, and whether the self current is larger than the preset current threshold value is continuously detected.
By the method, the problem of misdetection of UPS short circuit can be solved.
In one embodiment of the present application, the "when the load is short-circuited is detected," generating the short-circuit protection information "in S101 may include:
and when the load short circuit is detected and the time of the load short circuit lasts for a first preset time, generating short circuit protection information.
In the embodiment of the application, when the time for continuously detecting the load short circuit is greater than or equal to the first preset time, the short circuit protection information is generated, so that the short circuit protection is further carried out, and the false detection can be prevented.
The first preset time can be set according to actual requirements. Alternatively, the first preset time may be 200ms.
In one embodiment of the application, the parallel output ends of the UPSs are connected with the loads through circuit breakers, and the circuit breakers are in one-to-one correspondence with the loads;
the first preset time is greater than or equal to the opening time of the circuit breaker.
Alternatively, referring to fig. 2, the power distribution cabinet is connected to each load through each circuit breaker. In particular, loads that are remote from the power distribution cabinet must be equipped with corresponding circuit breakers.
The open time of a circuit breaker is the period of time from when the circuit breaker detects an anomaly (e.g., a short circuit anomaly) to when the circuit breaker opens completely.
In the embodiment of the application, the first preset time for continuously detecting the short circuit by the UPS is larger than or equal to the opening time of the circuit breaker.
In one embodiment of the application, the distance between any two UPSs in the UPS parallel machine system is not greater than a preset distance.
In the embodiment of the application, in the UPS parallel operation system, the short-distance parallel operation is recommended, which is favorable for the parallel operation system to normally perform short-circuit protection and further prevents the phenomenon of damage to machine devices.
Corresponding to the short-circuit protection method of the UPS parallel operation system, the embodiment of the application also provides a short-circuit protection device of the UPS parallel operation system, which has the same beneficial effects as the short-circuit protection method of the UPS parallel operation system. Fig. 3 is a schematic block diagram of a short-circuit protection device of a UPS parallel operation system according to an embodiment of the present application, and for convenience of explanation, only a portion related to the embodiment of the present application is shown. The short-circuit protection device of the UPS parallel operation system is applied to any UPS in the UPS parallel operation system.
In the embodiment of the present application, the short-circuit protection device 30 of the UPS parallel operation system may include an information sending module 301 and an output shutdown module 302.
The information sending module 301 is configured to generate short-circuit protection information when a load short-circuit is detected, send the short-circuit protection information to other UPS in the UPS parallel operation system, and perform short-circuit protection according to the short-circuit protection information; the short-circuit protection information is used for indicating each UPS in the UPS parallel operation system to perform short-circuit protection at the same time;
and the output closing module 302 is configured to perform short-circuit protection according to the short-circuit protection information when receiving the short-circuit protection information sent by other UPS in the UPS parallel operation system.
In one embodiment of the application, the output shutdown module 302 may also be configured to:
when short-circuit protection information sent by other UPS in the UPS parallel operation system is received, detecting whether the self current is larger than a preset current threshold value or not;
and if the detected self current is larger than the preset current threshold value, carrying out short-circuit protection according to the short-circuit protection information.
In one embodiment of the present application, the information sending module 301 may be further configured to:
and when the load short circuit is detected and the time of the load short circuit lasts for a first preset time, generating short circuit protection information.
In one embodiment of the application, the parallel output ends of the UPSs are connected with the loads through circuit breakers, and the circuit breakers are in one-to-one correspondence with the loads;
the first preset time is greater than or equal to the opening time of the circuit breaker.
In one embodiment of the present application, the information sending module 301 may be further configured to:
and sending short-circuit protection information to other UPS in the UPS parallel operation system through the CAN bus.
In one embodiment of the application, the short-circuit protection information includes a time at which the short-circuit protection is simultaneously performed;
the short-circuit protection information is used for indicating that each UPS in the UPS parallel operation system performs short-circuit protection at the time of simultaneously performing short-circuit protection.
In one embodiment of the application, the distance between any two UPSs in the UPS parallel machine system is not greater than a preset distance.
It will be clearly understood by those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of each functional unit and module is illustrated, and in practical application, the above-mentioned functional allocation may be performed by different functional units and modules according to needs, that is, the internal structure of the short-circuit protection device of the UPS parallel operation system is divided into different functional units or modules, so as to perform all or part of the functions described above. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, the specific names of the functional units and modules are only for distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above device may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
Fig. 4 is a schematic block diagram of a UPS provided in an embodiment of the application. As shown in fig. 4, the UPS40 of this embodiment includes: one or more processors 401, a memory 402, and a computer program 403 stored in the memory 402 and executable on the processor 401. The processor 401, when executing the computer program 403, implements the steps in the embodiments of the short-circuit protection method of the UPS parallel operation systems described above, such as steps S101 to S102 shown in fig. 1. Alternatively, the processor 401 may implement the functions of the modules/units in the embodiment of the short-circuit protection device of the UPS parallel operation system described above, such as the functions of the modules 301 to 302 shown in fig. 3, when executing the computer program 403.
Illustratively, the computer program 403 may be partitioned into one or more modules/units that are stored in the memory 402 and executed by the processor 401 to complete the present application. The one or more modules/units may be a series of computer program instruction segments capable of performing particular functions to describe the execution of the computer program 403 in the UPS 40. For example, the computer program 403 may be divided into an information sending module and an output closing module, where each module specifically functions as follows:
the information sending module is used for generating short-circuit protection information when the load is detected to be short-circuited, sending the short-circuit protection information to other UPS in the UPS parallel operation system, and carrying out short-circuit protection according to the short-circuit protection information; the short-circuit protection information is used for indicating each UPS in the UPS parallel operation system to perform short-circuit protection at the same time;
and the output closing module is used for carrying out short-circuit protection according to the short-circuit protection information when receiving the short-circuit protection information sent by other UPS in the UPS parallel operation system.
Other modules or units may be described with reference to the embodiment shown in fig. 3, and will not be described here again.
The UPS40 includes, but is not limited to, a processor 401, a memory 402. Those skilled in the art will appreciate that fig. 4 is only one example of a UPS40 and is not intended to be limiting of the UPS40, and may include more or fewer components than shown, or may combine certain components, or different components, e.g., the UPS40 may further include input devices, output devices, network access devices, buses, etc.
The processor 401 may be a central processing unit (Central Processing Unit, CPU), but may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 402 may be an internal storage unit of the UPS40, such as a hard disk or a memory of the UPS 40. The memory 402 may also be an external storage device of the UPS40, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash Card (Flash Card) or the like, which are provided on the UPS 40. Further, the memory 402 may also include both internal storage units and external storage devices of the UPS 40. The memory 402 is used to store the computer program 403 and other programs and data required by the UPS 40. The memory 402 may also be used to temporarily store data that has been output or is to be output.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the short-circuit protection device and method of the disclosed UPS parallel operation system may be implemented in other manners. For example, the embodiments of the short-circuit protection device of the UPS parallel operation system described above are merely illustrative, and for example, the division of the modules or units is merely a logic function division, and there may be other division manners in which the embodiments may be actually implemented, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection via interfaces, devices or units, which may be in electrical, mechanical or other forms.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated modules/units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the present application may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the computer program may implement the steps of each of the method embodiments described above. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth. It should be noted that the computer readable medium may include content that is subject to appropriate increases and decreases as required by jurisdictions in which such content is subject to legislation and patent practice, such as in certain jurisdictions in which such content is not included as electrical carrier signals and telecommunication signals.
The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (9)
1. The short circuit protection method of the UPS parallel operation system is characterized by being applied to any UPS in the UPS parallel operation system, and comprises the following steps:
when a load short circuit is detected, short circuit protection information is generated, the short circuit protection information is sent to other UPS in the UPS parallel operation system, and short circuit protection is carried out according to the short circuit protection information; the short-circuit protection information is used for indicating each UPS in the UPS parallel operation system to perform short-circuit protection at the same time;
when short-circuit protection information sent by other UPS in the UPS parallel operation system is received, detecting whether the current is larger than a preset current threshold value or not;
and if the self current is detected to be larger than the preset current threshold value, performing short-circuit protection according to the short-circuit protection information.
2. The method of claim 1, wherein generating the short protection information when the load is detected to be shorted, comprises:
and when the load short circuit is detected and the time of the load short circuit lasts for a first preset time, generating short circuit protection information.
3. The short-circuit protection method of the UPS parallel operation system according to claim 2, wherein the parallel output terminals of each UPS are connected to the load through circuit breakers, and the circuit breakers are in one-to-one correspondence with the loads;
the first preset time is greater than or equal to the opening time of the circuit breaker.
4. The method of claim 1, wherein the sending the short protection information to other UPS in the UPS parallel operation system comprises:
and sending the short-circuit protection information to other UPS in the UPS parallel operation system through a CAN bus.
5. The method of claim 1, wherein the short-circuit protection information includes a time for simultaneous short-circuit protection;
and the short-circuit protection information is used for indicating each UPS in the UPS parallel operation system to carry out short-circuit protection at the time of carrying out short-circuit protection at the same time.
6. The short-circuit protection method of a UPS parallel operation system according to any one of claims 1 to 5, wherein a distance between any two UPS in the UPS parallel operation system is not greater than a preset distance.
7. The utility model provides a short-circuit protection device of UPS parallel operation system, its characterized in that is applied to any UPS in the UPS parallel operation system, the short-circuit protection device of UPS parallel operation system includes:
the information sending module is used for generating short-circuit protection information when the load is detected to be short-circuited, sending the short-circuit protection information to other UPS in the UPS parallel operation system, and carrying out short-circuit protection according to the short-circuit protection information; the short-circuit protection information is used for indicating each UPS in the UPS parallel operation system to perform short-circuit protection at the same time;
the output closing module is used for detecting whether the self current is larger than a preset current threshold value or not when short-circuit protection information sent by other UPS in the UPS parallel operation system is received; and if the self current is detected to be larger than the preset current threshold value, performing short-circuit protection according to the short-circuit protection information.
8. A UPS comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, performs the steps of the short circuit protection method of a UPS parallel machine system as claimed in any one of claims 1 to 6.
9. A computer readable storage medium storing a computer program which when executed by one or more processors performs the steps of the short circuit protection method of a UPS parallel system as claimed in any one of claims 1 to 6.
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| CN111009878A (en) * | 2019-12-26 | 2020-04-14 | 上海派能能源科技股份有限公司 | Multi-output short-circuit protection circuit |
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