CN112018872B - UPS control method and UPS - Google Patents
UPS control method and UPS Download PDFInfo
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- CN112018872B CN112018872B CN202010845482.6A CN202010845482A CN112018872B CN 112018872 B CN112018872 B CN 112018872B CN 202010845482 A CN202010845482 A CN 202010845482A CN 112018872 B CN112018872 B CN 112018872B
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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
- H02J9/062—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 for AC powered loads
Abstract
The invention is suitable for the technical field of power supplies, and provides a UPS control method and a UPS, wherein the UPS control method comprises the following steps: when the UPS supplies power for the mains supply independently, the bus voltage of the UPS is acquired in real time; determining whether the bus voltage is less than a first preset voltage; and if the bus voltage is less than the first preset voltage, controlling the UPS to switch to the commercial power and the direct-current power supply for supplying power simultaneously. According to the invention, a quick detection scheme for detecting the commercial power is abandoned, the state of the commercial power is determined through the bus voltage, and when the bus voltage is abnormal, the bus voltage is immediately switched to a commercial power and direct-current power supply combined power supply mode, so that seamless switching between commercial power supply and direct-current power supply is realized, the load power failure is prevented, the system is stable and reliable, and false detection is not caused.
Description
Technical Field
The invention belongs to the technical field of power supplies, and particularly relates to a UPS control method and a UPS.
Background
An Uninterruptible Power Supply (UPS) is a device that can continue to supply Power to a load when an ac input Power supply is abnormal or is powered off, thereby ensuring that the load supplies Power normally. The cable has excellent performance and convenient maintenance function, and is widely applied to various fields. When the commercial power is normal, the commercial power supplies power to the load, and the storage battery does not supply power; when the commercial power is abnormal, the storage battery supplies power for the load.
In the prior art, mains supply power failure is detected immediately by adopting mains supply power failure quick detection and is quickly switched to supply power to a storage battery so as to ensure that a load is not powered off. However, in order to reduce the cost of the UPS, the capacitance value of the bus capacitor is reduced, the falling speed of the bus capacitor is too fast after the mains supply is powered down, the fast detection time needs to be shortened, and false detection is easily caused.
Disclosure of Invention
In view of this, embodiments of the present invention provide a UPS control method and a UPS, so as to solve the problems in the prior art that a bus capacitance is reduced, a fast detection time is shortened, and false detection is easily caused.
A first aspect of an embodiment of the present invention provides a UPS control method, where a UPS includes: the system comprises a direct-current power supply, an inversion module, a first power supply circuit, a second power supply circuit and a bus capacitor, wherein the first power supply circuit and the second power supply circuit are connected to a bus in parallel and connected with the inversion module through the bus;
the first power supply circuit is provided with a PFC module; the first power supply circuit transmits the electric energy of the commercial power to the bus through the PFC module; the second power supply circuit transmits the electric energy of the direct current power supply to the bus; the output end of the inversion module is used for connecting a load;
the UPS control method comprises the following steps:
when the UPS supplies power for the mains supply independently, the bus voltage of the UPS is acquired in real time;
determining whether the bus voltage is less than a first preset voltage;
and if the bus voltage is less than the first preset voltage, controlling the UPS to switch to the commercial power and the direct-current power supply for supplying power simultaneously.
A second aspect of an embodiment of the present invention provides a UPS control apparatus, where a UPS includes: the system comprises a direct-current power supply, an inversion module, a first power supply circuit, a second power supply circuit and a bus capacitor, wherein the first power supply circuit and the second power supply circuit are connected to a bus in parallel and connected with the inversion module through the bus;
the first power supply circuit is provided with a PFC module; the first power supply circuit transmits the electric energy of the commercial power to the bus through the PFC module; the second power supply circuit transmits the electric energy of the direct current power supply to the bus; the output end of the inversion module is used for connecting a load;
the UPS control device includes:
the bus voltage acquisition module is used for acquiring the bus voltage of the UPS in real time when the UPS independently supplies power to the mains supply;
the first judgment module is used for determining whether the bus voltage is smaller than a first preset voltage;
and the first switching module is used for controlling the UPS to switch to the commercial power supply and the direct-current power supply for supplying power simultaneously if the bus voltage is less than a first preset voltage.
A third aspect of the embodiments of the present invention provides a terminal device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor executes the computer program to implement the steps of the UPS control method according to the first aspect of the embodiments of the present invention.
A fourth aspect of the embodiments of the present invention provides a computer-readable storage medium, in which a computer program is stored, and the computer program, when executed by a processor, implements the steps of the UPS control method according to the first aspect of the embodiments of the present invention.
The embodiment of the invention provides a UPS control method, which comprises the following steps: when the UPS supplies power for the mains supply independently, the bus voltage of the UPS is acquired in real time; determining whether the bus voltage is less than a first preset voltage; and if the bus voltage is less than the first preset voltage, controlling the UPS to switch to the commercial power and the direct-current power supply for supplying power simultaneously. In the embodiment of the invention, a quick detection scheme for detecting the commercial power is abandoned, the voltage of the bus capacitor is directly detected to determine the state of the commercial power, and when the bus voltage is abnormal, the mode is immediately switched to a commercial power and direct-current power supply combined power supply mode, so that the seamless switching between the commercial power supply and the direct-current power supply is realized, the load power failure is prevented, the false detection caused by the reduction of the bus capacitor is avoided, and the method is stable and reliable.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic circuit diagram of a UPS according to an embodiment of the present invention;
fig. 2 is a schematic flow chart illustrating an implementation process of a UPS control method according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a UPS control apparatus according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a terminal device according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention 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 invention with unnecessary detail.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
Referring to fig. 1 and fig. 2, an embodiment of the present invention provides a UPS control method, where the UPS includes: the system comprises a direct-current power supply, an inversion module, a first power supply circuit, a second power supply circuit and a bus capacitor, wherein the first power supply circuit and the second power supply circuit are connected to a bus in parallel and connected with the inversion module through the bus;
the first power supply circuit is provided with a PFC module; the first power supply circuit transmits the electric energy of the commercial power to the bus through the PFC module; the second power supply circuit transmits the electric energy of the direct current power supply to the bus; the output end of the inversion module is used for connecting a load;
the UPS control method comprises the following steps:
step S101: when the UPS supplies power for the mains supply independently, the bus voltage of the UPS is acquired in real time;
step S102: determining whether the bus voltage is less than a first preset voltage;
step S103: and if the bus voltage is less than the first preset voltage, controlling the UPS to switch to the commercial power and the direct-current power supply for supplying power simultaneously.
In the embodiment of the invention, the bus voltage is directly acquired, when the bus voltage is lower than the first preset voltage, the mains supply is abnormal at the moment, and then the mains supply and the direct-current power supply jointly supply power, so that seamless switching between the mains supply and the direct-current power supply can be realized, the load is ensured not to be powered off, false detection caused by reduction of the capacitance is avoided, and the method is stable and reliable.
In some embodiments, step S103 may include:
step S1031: and if the bus voltage is less than the first preset voltage and the time that the bus voltage is less than the first preset voltage lasts for the first preset time, controlling the UPS to switch to the commercial power supply and the direct-current power supply for supplying power simultaneously.
In order to prevent misoperation caused by voltage fluctuation of the bus, when the voltage of the bus is lower than a first preset voltage for a first preset time, the UPS is controlled to be switched to a commercial power supply and a direct-current power supply for supplying power simultaneously, so that the misoperation is prevented.
In some embodiments, the first preset time may be 0.5ms to 1 ms.
In some embodiments, the rated bus voltage of the UPS when the commercial power is supplied alone is a second preset voltage, and the rated bus voltage of the UPS when the dc power supply is supplied alone is a third preset voltage;
the second preset voltage is greater than the third preset voltage, and the third preset voltage is greater than the first preset voltage.
In some embodiments, the first predetermined voltage may be 345V, the second predetermined voltage may be 385V, and the third predetermined voltage may be 375V.
The first preset voltage is larger than the minimum bus voltage without topping output by the inversion module in the UPS and is lower than the third preset voltage and the second preset voltage. Because the utility power supply cost is low, when the utility power and the direct current power supply jointly supply power, the rated bus voltage of the UPS when the utility power supplies power alone is larger than the rated bus voltage of the direct current power supply when supplies power alone, the utility power preferentially supplies power, the power supply cost is reduced, and the loss of the direct current power supply is reduced.
For example, when the mains supply is normal, the bus voltage is 385V; when the commercial power is abnormal, the bus voltage begins to drop, when the bus voltage drops to 345V, the direct current power supply is started to supply power, and the voltage of the bus capacitor is pulled up to 375V due to the fact that the rated output voltage of the direct current power supply is 375V, normal work of the UPS is guaranteed, and the load is not powered off. If the voltage of the commercial power is low, the commercial power and the direct current power supply power simultaneously; if the mains supply is powered off, the direct current power supply supplies power independently.
In some embodiments, step S103 may include:
step S1032: acquiring the power required by a bus;
step S1033, when the sum of the maximum output power of the PFC module and the maximum output power of the direct-current power supply is not less than the power required by the bus, controlling the output power of the PFC module to be the maximum output power of the PFC module, and controlling the output power of the direct-current power supply to be the difference value between the power required by the bus and the maximum output power of the PFC module;
step S1034: and when the sum of the maximum output power of the PFC module and the maximum output power of the direct-current power supply is smaller than the power required by the bus, controlling the output power of the PFC module to be the maximum output power of the PFC module and controlling the output power of the direct-current power supply to be the maximum output power of the direct-current power supply.
To improve the efficiency of the UPS, the sum of the output power of the dc power supply and the output power of the PFC module should be balanced with the power demand of the bus. Meanwhile, the mains supply cost is low, when the sum of the maximum output power of the PFC module and the maximum output power of the direct-current power supply is not less than the power required by the bus, the mains supply supplies power preferentially, and the PFC outputs full power, and the deficiency is partially supplemented by the direct-current power supply. And if the PFC module and the direct-current power supply do not meet the bus power requirement when both the PFC module and the direct-current power supply output full power, both the PFC module and the direct-current power supply output maximum power. In the practical application process, if the PFC module and the dc power supply both output with the maximum power and still cannot meet the bus power requirement for a long time, the UPS enters a protection state.
In some embodiments, the UPS control method may further include:
step S104: acquiring the output current of a direct current power supply in real time;
step S105: determining whether the output current of the direct current power supply is smaller than a preset current or not;
step S106: and if the output current of the direct current power supply is smaller than the preset current, controlling the UPS to be switched to the independent power supply of the commercial power.
After the UPS starts the joint power supply of the commercial power and the direct-current power supply, if the fact that the commercial power is recovered to be normal is detected, the direct-current power supply quits the power supply, the commercial power supplies power independently, and the power supply cost is reduced. When the mains supply is normal, because the rated output voltage is large when the mains supply supplies power alone, the rated voltage is small when the direct current power supply supplies power alone, the output current of the direct current power supply is reduced along with the increase of the bus voltage, and when the output current of the direct current power supply is smaller than the preset current, the UPS is mainly supplied with power by the mains supply, and the UPS is switched to the mains supply to supply power alone, so that the power supply cost is reduced.
In addition, if the output current of the direct current power supply is smaller than the preset current due to insufficient residual capacity of the direct current power supply and the like, and the bus voltage is still smaller than the first preset voltage at the moment, the UPS enters a protection state.
In some embodiments, step S106 may include:
step S1061: and if the output current of the direct current power supply is smaller than the preset current and the time that the output current of the direct current power supply is smaller than the preset current lasts for the second preset time, controlling the UPS to be switched to the independent power supply of the commercial power.
In some embodiments, the second preset time may be 0.5ms to 1 ms.
In some embodiments, step S106 may include:
step S1062: acquiring the power required by a bus;
step S1063: when the power required by the bus is smaller than the maximum output power of the PFC module, controlling the PFC module to charge the direct-current power supply;
step S1064: and when the power required by the bus is equal to the maximum output power of the PFC module, controlling the output power of the PFC module to be the maximum output power of the PFC module, and controlling the direct-current power supply to be out of work.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
Referring to fig. 3, an embodiment of the present invention further provides a UPS control apparatus, where a UPS includes: the system comprises a direct-current power supply, an inversion module, a first power supply circuit, a second power supply circuit and a bus capacitor, wherein the first power supply circuit and the second power supply circuit are connected to a bus in parallel and connected with the inversion module through the bus;
the first power supply circuit is provided with a PFC module; the first power supply circuit transmits the electric energy of the commercial power to the bus through the PFC module; the second power supply circuit transmits the electric energy of the direct current power supply to the bus; the output end of the inversion module is used for connecting a load;
the UPS control device includes:
the bus voltage acquisition module 21 is used for acquiring the bus voltage of the UPS in real time when the UPS supplies power to the mains supply independently;
the first judging module 22 is configured to determine whether the bus voltage is less than a first preset voltage;
and the first switching module 23 is configured to control the UPS to switch to a commercial power supply and a dc power supply to supply power simultaneously if the bus voltage is less than a first preset voltage.
In some embodiments, the first switching module 23 may include:
and the first switching unit is used for controlling the UPS to be switched into commercial power and direct-current power supply for supplying power simultaneously if the bus voltage is less than the first preset voltage and the time that the bus voltage is less than the first preset voltage lasts for the first preset time.
In some embodiments, the preset time may be 0.5ms to 1 ms.
In some embodiments, the rated bus voltage of the UPS when the commercial power is supplied alone is a second preset voltage, and the rated bus voltage of the UPS when the dc power supply is supplied alone is a third preset voltage;
the second preset voltage is greater than the third preset voltage, and the third preset voltage is greater than the first preset voltage.
In some embodiments, the first predetermined voltage may be 345V, the second predetermined voltage may be 385V, and the third predetermined voltage may be 375V.
In some embodiments, the first switching module 23 may include:
the first power acquisition unit is used for acquiring the power required by the bus;
the first power control unit is used for controlling the output power of the PFC module to be the maximum output power of the PFC module and controlling the output power of the DC power supply to be the difference value between the power required by the bus and the maximum output power of the PFC module when the sum of the maximum output power of the PFC module and the maximum output power of the DC power supply is not less than the power required by the bus;
and the second power control unit is used for controlling the output power of the PFC module to be the maximum output power of the PFC module and controlling the output power of the DC power supply to be the maximum output power of the DC power supply when the sum of the maximum output power of the PFC module and the maximum output power of the DC power supply is smaller than the power required by the bus.
In some embodiments, the UPS control apparatus may further include:
the current acquisition module 24 is used for acquiring the output current of the direct-current power supply in real time;
a second determination module 25, configured to determine whether an output current of the dc power supply is smaller than a preset current;
and a second switching module 26, configured to control the UPS to switch to the independent power supply of the utility power if the output current of the dc power supply is smaller than the preset current.
In some embodiments, the second switching module 26 may include:
and the second switching unit is used for controlling the UPS to be switched into independent power supply of the commercial power if the output current of the direct current power supply is smaller than the preset current and the time that the output current of the direct current power supply is smaller than the preset current lasts for a second preset time.
In some embodiments, the second switching module 26 may include:
the second power acquisition unit is used for acquiring the power required by the bus;
the third power control unit is used for controlling the PFC module to charge the direct-current power supply when the power required by the bus is smaller than the maximum output power of the PFC module;
and the fourth power control unit is used for controlling the output power of the PFC module to be the maximum output power of the PFC module and controlling the direct-current power supply to be out of work when the power required by the bus is equal to the maximum output power of the PFC module.
It is obvious to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional units and modules is merely used as an example, and in practical applications, the foregoing function distribution may be performed by different functional units and modules as needed, that is, the internal structure of the terminal device 4 is divided into different functional units or modules to perform all or part of the above-described functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the above-mentioned apparatus may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
Fig. 4 is a schematic block diagram of a terminal device according to an embodiment of the present invention. As shown in fig. 4, the terminal device of this embodiment includes: one or more processors 40, a memory 41, and a computer program 42 stored in the memory 41 and executable on the processors 40. The processor 40, when executing the computer program 42, implements the steps in the various UPS control method embodiments described above, such as steps S101 to S103 shown in fig. 2. Alternatively, the processor 40, when executing the computer program 42, implements the functions of the modules/units in the UPS control apparatus embodiments described above, such as the functions of the modules 21 to 23 shown in fig. 3.
Illustratively, the computer program 42 may be divided into one or more modules/units, which are stored in the memory 41 and executed by the processor 40 to accomplish the present application. One or more of the modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution of the computer program 42 in the terminal device 4. For example, the computer program 42 may be divided into the bus bar voltage acquisition module 21, the first determination module 22, and the first switching module 23.
The bus voltage acquisition module 21 is used for acquiring the bus voltage of the UPS in real time when the UPS supplies power to the mains supply independently;
the first judging module 22 is configured to determine whether the bus voltage is less than a first preset voltage;
and the first switching module 23 is configured to control the UPS to switch to a commercial power supply and a dc power supply to supply power simultaneously if the bus voltage is less than a first preset voltage.
Other modules or units are not described in detail herein.
The Processor 40 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The storage 41 may be an internal storage unit of the terminal device 4, such as a hard disk or a memory of the terminal device 4. The memory 41 may also be an external storage device of the terminal device 4, such as a plug-in hard disk provided on the terminal device 4, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like. Further, the memory 41 may also include both an internal storage unit of the terminal device 4 and an external storage device. The memory 41 is used for storing the computer program 42 and other programs and data required by the terminal device 4. The memory 41 may also be used to temporarily store data that has been output or is to be output.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
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 implementation. 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 disclosed terminal device and method may be implemented in other ways. For example, the above-described terminal device embodiments are merely illustrative, and for example, a module or a unit may be divided into only one logical function, and may be implemented in other ways, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
Units described as separate parts may or may not be physically separate, and parts displayed 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 can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit may be implemented in the form of hardware, or may also be implemented in the form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow in the method according to the embodiments described above may be implemented by a computer program, which is stored in a computer readable storage medium and used by a processor to implement the steps of the embodiments of the methods described above. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying computer program code, recording medium, U.S. disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution media, and the like. It should be noted that the computer readable medium may include any suitable increase or decrease as required by legislation and patent practice in the jurisdiction, for example, in some jurisdictions, computer readable media may not include electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present application, and they should be construed as being included in the present application.
Claims (8)
1. A UPS control method, wherein the UPS comprises: the power supply comprises a direct-current power supply, an inversion module, a first power supply circuit and a second power supply circuit which are connected to a bus in parallel and connected with the inversion module through the bus, and a bus capacitor arranged between the buses;
the first power supply circuit is provided with a PFC module; the first power supply circuit transmits the electric energy of commercial power to the bus through the PFC module; the second power supply circuit transmits the electric energy of the direct current power supply to the bus; the output end of the inversion module is used for connecting a load;
the UPS control method comprises the following steps:
when the UPS independently supplies power to the mains supply, acquiring the bus voltage of the UPS in real time;
determining whether the bus voltage is less than a first preset voltage;
if the bus voltage is less than the first preset voltage, controlling the UPS to switch to a commercial power supply and a direct-current power supply for supplying power simultaneously;
the rated bus voltage of the UPS is a second preset voltage when the mains supply supplies power independently, and the rated bus voltage of the UPS is a third preset voltage when the direct-current power supply supplies power independently;
the second preset voltage is greater than the third preset voltage, and the third preset voltage is greater than the first preset voltage;
the UPS control method further comprises the following steps:
when the UPS supplies power to the commercial power and the direct current power supply at the same time, acquiring the output current of the direct current power supply and the bus voltage of the UPS in real time;
and if the bus voltage is not less than the first preset voltage and the output current of the direct current power supply is less than the preset current, controlling the UPS to be switched to the independent power supply of the commercial power.
2. The method for controlling the UPS according to claim 1, wherein if the bus voltage is less than the first predetermined voltage, the controlling the UPS to switch to a commercial power supply and the dc power supply simultaneously comprises:
and if the bus voltage is less than the first preset voltage and the time that the bus voltage is less than the first preset voltage lasts for a first preset time, controlling the UPS to switch to the commercial power and the DC power supply to supply power simultaneously.
3. The UPS control method according to claim 1 or 2, wherein the controlling the UPS to switch to a commercial power supply and the dc power supply to supply power simultaneously comprises:
acquiring the power required by the bus;
when the sum of the maximum output power of the PFC module and the maximum output power of the direct-current power supply is not less than the power required by the bus, controlling the output power of the PFC module to be the maximum output power of the PFC module, and controlling the output power of the direct-current power supply to be the difference value between the power required by the bus and the maximum output power of the PFC module;
and when the sum of the maximum output power of the PFC module and the maximum output power of the direct-current power supply is smaller than the power required by the bus, controlling the output power of the PFC module to be the maximum output power of the PFC module and controlling the output power of the direct-current power supply to be the maximum output power of the direct-current power supply.
4. The UPS control method of claim 1, wherein the controlling the UPS to switch to mains-only power supply comprises:
acquiring the power required by the bus;
when the power required by the bus is smaller than the maximum output power of the PFC module, controlling the PFC module to charge the direct-current power supply;
and when the power required by the bus is equal to the maximum output power of the PFC module, controlling the output power of the PFC module to be the maximum output power of the PFC module and controlling the direct-current power supply to be out of work.
5. The method of claim 1, wherein if the bus voltage is not less than the first predetermined voltage and the output current of the dc power supply is less than a predetermined current, the controlling the UPS to switch to the single-power-supply mode comprises:
if the bus voltage is not less than the first preset voltage, the output current of the direct current power supply is less than the preset current, and the output current of the direct current power supply is less than the time of the preset current lasts for a second preset time, the UPS is controlled to be switched to the independent power supply of the commercial power.
6. A UPS control apparatus, wherein the UPS comprises: the power supply comprises a direct-current power supply, an inversion module, a first power supply circuit and a second power supply circuit which are connected to a bus in parallel and connected with the inversion module through the bus, and a bus capacitor arranged between the buses;
the first power supply circuit is provided with a PFC module; the first power supply circuit transmits the electric energy of commercial power to the bus through the PFC module; the second power supply circuit transmits the electric energy of the direct current power supply to the bus; the output end of the inversion module is used for connecting a load;
the UPS control device includes:
the bus voltage acquisition module is used for acquiring the bus voltage of the UPS in real time when the UPS independently supplies power to the mains supply;
the first judgment module is used for determining whether the bus voltage is smaller than a first preset voltage;
the first switching module is used for controlling the UPS to be switched into a commercial power supply and a direct-current power supply to supply power simultaneously if the bus voltage is smaller than the first preset voltage;
the rated bus voltage of the UPS is a second preset voltage when the mains supply supplies power independently, and the rated bus voltage of the UPS is a third preset voltage when the direct-current power supply supplies power independently;
the second preset voltage is greater than the third preset voltage, and the third preset voltage is greater than the first preset voltage;
the second judgment module is used for acquiring the output current of the direct current power supply and the bus voltage of the UPS in real time when the UPS supplies power to the commercial power and the direct current power supply simultaneously;
and the second switching module is used for controlling the UPS to switch to the independent power supply of the commercial power if the bus voltage is not less than the first preset voltage and the output current of the direct-current power supply is less than the preset current.
7. A terminal device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the UPS control method according to any one of claims 1 to 5 when executing the computer program.
8. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the UPS control method according to any one of claims 1 to 5.
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