CN116436149A - Uninterruptible power supply, system including a plurality of uninterruptible power supplies, and control method - Google Patents
Uninterruptible power supply, system including a plurality of uninterruptible power supplies, and control method Download PDFInfo
- Publication number
- CN116436149A CN116436149A CN202310336588.7A CN202310336588A CN116436149A CN 116436149 A CN116436149 A CN 116436149A CN 202310336588 A CN202310336588 A CN 202310336588A CN 116436149 A CN116436149 A CN 116436149A
- Authority
- CN
- China
- Prior art keywords
- supply
- power
- input end
- state
- uninterruptible power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000012546 transfer Methods 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 238000004891 communication Methods 0.000 claims description 5
- 208000015778 Undifferentiated pleomorphic sarcoma Diseases 0.000 description 30
- 238000010586 diagram Methods 0.000 description 5
- 238000004402 ultra-violet photoelectron spectroscopy Methods 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 3
- 238000012937 correction Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 3
- 230000003111 delayed effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Images
Classifications
-
- 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
- H02J9/08—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 requiring starting of a prime-mover
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
Abstract
The embodiment of the application discloses a system and control method including uninterrupted power source, a plurality of uninterrupted power source, and the system includes diesel generator, and diesel generator's output is connected to uninterrupted power source's commercial power input, and the commercial power input still is used for connecting the electric wire netting, and a plurality of uninterrupted power source are not communicated each other, and the method includes: judging whether the mains supply input end can supply power or not; if so, based on different preset first delay time periods, the uninterrupted power supplies are controlled to be switched from the current state to the power supply state of the mains supply input end one by one, and the current state is a standby state or a battery power supply state.
Description
Technical Field
Embodiments of the present disclosure relate to the field of power, and in particular, to an uninterruptible power supply, a system including a plurality of uninterruptible power supplies, and a control method.
Background
The power cabin system consists of an automatic change-over switch and at least two uninterrupted power supplies, and can input energy at the mains supply input end of the system through a mains supply and a diesel generator set. The automatic change-over switch is used for switching, so that the commercial power or the diesel generator set can be selected, and the uninterrupted power supplies are used for supplying power to the load, wherein the uninterrupted power supplies are mutually independent and are free from parallel machine communication.
The utility power is normally supplied by the mains supply, when the mains supply is powered down, the uninterruptible power supplies can be switched from the mains supply to the battery supply, after the diesel generator set is started, the uninterruptible power supplies are simultaneously switched from the battery supply to the diesel generator set supply, at the moment, the load is instantly added to the mains supply input end, the voltage of the mains supply input end is pulled down and is lower than a normal voltage range, and the uninterruptible power supplies can be switched from the diesel generator set supply to the battery supply. After the power supply is switched to the battery power supply, the voltage of the diesel generator set is recovered to be normal, the uninterrupted power supply is switched to the diesel generator set power supply by the battery power supply, the voltage of the commercial power input end is pulled down again, and the cycle is repeated. This results in frequent switching, which is detrimental to the stability of the power supply.
Disclosure of Invention
The embodiment of the application provides an uninterruptible power supply, a system comprising a plurality of uninterruptible power supplies and a control method.
A control method of a system including a plurality of uninterruptible power supplies, the system including a diesel generator, an output of the diesel generator being connected to a utility input of the uninterruptible power supplies, the utility input being further for connection to a power grid, the plurality of uninterruptible power supplies not communicating with each other, the method comprising:
judging whether the commercial power input end can supply power or not;
if so, the uninterrupted power supplies are controlled to be switched from the current state to the power supply state of the mains supply input end one by one based on preset different first delay time periods, and the current state is a standby state or a battery power supply state.
Optionally, if the mains input terminal is capable of supplying power, the method further includes, based on a preset different first delay period, controlling the plurality of uninterruptible power supplies one by one before switching from a current state to a power supply state of the mains input terminal:
judging whether the commercial power input end is powered by the diesel generator or not;
if yes, executing the step of controlling the uninterrupted power supplies to be switched from the current state to the energy supply state of the mains supply input end one by one based on the preset different first time delay time periods;
if not, the uninterrupted power supplies are controlled to be switched from the current state to the energy supply state of the mains supply input end.
Optionally, the determining whether the mains input terminal can supply power includes:
acquiring the voltage of a mains supply input end and the frequency of the mains supply input end;
judging whether the voltage of the mains supply input end is in a preset first voltage range and the frequency of the mains supply input end is in a preset first frequency range at present;
if yes, determining that the commercial power input end can supply power;
if not, the uninterruptible power supply is controlled to be in the standby state or the battery energy supply state.
Optionally, if the mains input terminal cannot supply power, before the uninterruptible power supply is controlled to be in the standby state or the battery powered state, the method further includes:
judging whether a battery of the uninterruptible power supply can supply power or not;
the controlling the uninterruptible power supply in the standby state or the battery-powered state includes:
if the battery can supply power, the uninterruptible power supply is controlled to be in the battery energy supply state;
and if the battery can not supply power, controlling the uninterrupted power supply to be in the standby state.
Optionally, the determining whether the battery of the uninterruptible power supply can supply power specifically includes:
judging whether the acquired battery voltage is in a preset second voltage range;
if yes, determining that the battery can supply power;
if not, determining that the battery cannot supply power.
Optionally, the controlling the plurality of uninterruptible power supplies to switch from a current state to a power supply state of a mains supply input end specifically includes:
and controlling the switch connected with the mains supply input end to be turned on, and delaying to disconnect the switch connected with the direct current input end of the uninterrupted power supply based on a preset second delay time period so as to supply energy to a load through the mains supply input end.
Optionally, after the controlling the plurality of uninterruptible power supplies to switch from the current state to the mains input power supply state, the method further includes:
and reducing loop parameters of a conversion module of the uninterruptible power supply connected with the mains supply input end.
From the above technical solutions, the embodiments of the present application have the following advantages:
judging whether the mains supply input end can supply power, if so, controlling a plurality of uninterruptible power supplies to be switched from the current state to the energy supply state of the mains supply input end one by one based on the first delay time period. When the mains supply input end can supply power, based on a plurality of preset different first time delay time periods, different time points can be determined, and the uninterruptible power supplies are controlled one by one according to the different time points so as to be switched from the current state to the power supply state of the mains supply input end, namely, the time-sharing switching state of the plurality of uninterruptible power supplies. Therefore, when the current state is switched to the energy supply state of the mains supply input end, the voltage of the mains supply input end is not pulled down to be out of the normal voltage range, repeated switching is avoided, and stable power supply is ensured.
The present invention provides an uninterruptible power supply that performs the method of any of the above.
The invention further provides a system comprising a plurality of uninterruptible power supplies, the system comprising: the diesel generator, the automatic transfer switch and the uninterrupted power supplies are not communicated with each other;
the input end of the automatic transfer switch is respectively used for connecting the diesel generator and the power grid, the output end of the automatic transfer switch is connected with the mains supply input ends of a plurality of uninterruptible power supplies, and the output end of the uninterruptible power supplies is used for connecting loads and supplying energy to the loads.
The uninterruptible power supply and the system comprising a plurality of uninterruptible power supplies provided by the invention inherit the control method, so that the uninterruptible power supply and the system have the same advantages.
Drawings
FIG. 1 is a schematic diagram of one embodiment of a control method of the present application;
FIG. 2 is a schematic diagram of another embodiment of a control method of the present application;
FIG. 3 is a schematic diagram of another embodiment of a control method of the present application;
FIG. 4 is a schematic diagram of an embodiment of an uninterruptible power supply of the present application;
fig. 5 is a schematic diagram of a system embodiment of the present application.
Detailed Description
The embodiment of the application provides a system comprising a plurality of uninterruptible power supplies, a control method and a device.
The logic of a common uninterruptible power supply (i.e., UPS) is that when power is supplied to a mains input, the mains supplies power to a load through a converter, and when the mains is powered down, the power is switched to a battery to supply power to the load. In the case of a diesel generator, the diesel generator may be connected to the mains input via a change-over switch, and may optionally be powered by the diesel engine when the mains is powered down. However, because the diesel engine needs time to start, in order to avoid power failure of the load, the diesel engine is generally switched to battery power supply preferentially when the commercial power is found to be power failure, and when the diesel engine is detected to be capable of normally supplying power, the battery power supply is switched to the diesel engine power supply, so that the energy loss of the battery is reduced. For a system comprising a plurality of UPSs, if no communication exists among the plurality of UPSs, after a diesel engine is started, all the UPSs can detect that the diesel engine can normally supply power, each UPS can be switched from battery power supply to diesel engine power supply, and because a diesel generator is a weak power grid, if the plurality of UPSs are started simultaneously, the output voltage is likely to be pulled down, even the power cannot be supplied, and therefore, the UPSs are switched to battery power supply again, and the process is repeated. In addition, the voltage at the input end of the mains supply can oscillate due to the simultaneous switching of a plurality of uninterruptible power supplies, even the fundamental wave effective value is not stabilized at 220V, and the power supply cannot be effectively performed. In order to solve the problems, the application provides a system, a control method and a device comprising a plurality of uninterruptible power supplies, so that repeated switching is avoided, oscillation of the voltage and the frequency of a mains supply input end in the same scene is avoided, power supply stability is guaranteed, and better experience is brought to a user.
The control method of the system of the present application is described below. Referring to fig. 1, in one embodiment of a control method of a system of the present application, the system includes a diesel generator, an output end of the diesel generator is connected to a mains input end of an uninterruptible power supply, the mains input end is further used for connecting a power grid, and a plurality of uninterruptible power supplies do not communicate with each other, the method includes:
101. judging whether the mains supply input end can supply power, if so, executing step 102, and if not, executing step 103;
specifically, whether the voltage of the mains supply input end is in a preset first voltage range and the frequency of the mains supply input end is in a preset first frequency range is judged, namely, whether the voltage and the frequency of the mains supply input end are in a preset normal range is judged, if the voltage and the frequency of the mains supply input end are both in the normal range, the mains supply input end is confirmed to be capable of supplying power, and if the voltage and the frequency of the mains supply input end are not in the normal range or are not in the normal range, the mains supply input end is judged to be incapable of supplying power, and the uninterruptible power supply is controlled to be in a standby state or a battery power supply state.
102. Based on different preset first delay time periods, a plurality of uninterruptible power supplies are controlled to be switched from a current state to a power supply state of a mains supply input end one by one;
when the mains supply input end can supply power, the uninterrupted power supplies are controlled to be switched from the current state to the energy supply state of the mains supply input end one by one based on different preset first delay time periods, and the current state is a standby state or a battery energy supply state. Wherein, the first time delay period can be a plurality of, and each is different. In addition, the plurality of uninterruptible power supplies are also controlled according to a plurality of first delay time periods, and the number of the first delay time periods is the same as that of the uninterruptible power supplies. Specifically, the address may be used to obtain the first delay period, and the following formula may be used, but is not limited to, to confirm the first delay period:
t= (uninterruptible power supply address-1) ×x;
wherein T is a first delay time period, and x is an interval time period of switching states of the two uninterruptible power supplies. The time interval is too short to avoid the situation that the former uninterrupted power supply is not normally connected with the latter uninterrupted power supply and the latter uninterrupted power supply is connected with the former uninterrupted power supply. The time interval between every two uninterruptible power supplies can be the same or different, and is not limited herein.
For example, different first delay time periods are preset, namely, delay time is 5 seconds, delay time is 10 seconds, delay time is 15 seconds and delay time is 20 seconds, 4 uninterruptible power supplies are corresponding to the first uninterruptible power supply, when the delay time is 5 seconds, the state of the first uninterruptible power supply corresponding to the address is switched, when the delay time is 10 seconds, the state of the second uninterruptible power supply corresponding to the address is switched, when the delay time is 15 seconds, the state of the third uninterruptible power supply corresponding to the address is switched, when the delay time is 20 seconds, the state of the fourth uninterruptible power supply corresponding to the address is switched, and the like.
It should be noted that during the first delay period described in step 102, the UPS is maintained in a current state, and the UPS is maintained in a standby state, and the UPS is maintained in a battery-powered state.
103. The uninterruptible power supply is controlled to be in a standby state or a battery powered state.
When the mains supply input end cannot supply power, the mains supply and the diesel generator cannot supply power, and the uninterruptible power supply cannot normally acquire energy from the mains supply input end, so that the uninterruptible power supply is in a standby state or is powered by a battery. If the battery is powered in the current state and the battery can also supply power, the current battery powered state can be maintained; if the standby state is the current state, the instruction is the system starting time, and whether the battery power supply state is entered or not can be selected according to the requirement.
In the embodiment of the application, whether the mains supply input end can supply power is judged, if so, the uninterrupted power supplies are controlled to be switched to the energy supply state of the mains supply input end from the current state one by one based on the first delay time period. When the mains supply input end can supply power, based on a plurality of preset first delay time periods which are different from each other, each UPS corresponds to different delay time, namely, each UPS performs switching at different time points so as to switch from the current state to the energy supply state of the mains supply input end. Therefore, when the current state is switched to the energy supply state of the mains supply input end, the voltage of the mains supply input end is not pulled down to be out of the normal voltage range, repeated switching is avoided, and the power supply stability is ensured.
Referring to fig. 2, for step 101, further, when the mains input is capable of supplying power, step 201 may be performed first: judging whether the commercial power input end is powered by a diesel generator, if so, executing step 102, and if not, executing step 202: and controlling the uninterrupted power supplies to be switched from the current state to the supply state of the mains supply input end.
If the utility power input end can supply power and is supplied by the diesel generator, the uninterruptible power supply is controlled to be switched to the utility power input end to supply power one by one according to the step 102, so that the phenomenon that the output voltage is pulled out due to the fact that a plurality of UPS are added to the diesel generator at the same time is avoided.
If the mains supply input end can supply power and is not supplied by the diesel generator, the mains supply is supplied at the moment, and as the mains supply is a strong power grid compared with diesel generation, a plurality of UPS are simultaneously switched to the power supply input end for supplying power, and the output voltage is not led to be pulled to be crotch, therefore, the UPS is not required to be switched to the power supply input end for supplying power in a time-sharing way, so that all the UPS is ensured to be switched to the power supply of the mains supply quickly, and excessive consumption of battery energy is avoided. It can be understood that when the mains supply input is powered by the mains supply, the time-sharing switching method can also be adopted, and the time-sharing switching method is specific to actual requirements.
In other embodiments, if the power of the diesel generator is larger and the power of the uninterruptible power supply is smaller, it is ensured that the normal operation of the diesel engine is not affected even if the plurality of UPS are started simultaneously, the preset first delay time periods of the plurality of UPS can be controlled to be the same, that is, the plurality of UPS are controlled to be started simultaneously, the overall switching period is accelerated, and the control can be specifically performed according to actual conditions.
Judging whether the commercial power input end is powered by the diesel generator, specifically, judging whether the commercial power is selected or the diesel generator through an automatic change-over switch, when the current automatic change-over switch is connected with the diesel generator, powering the diesel generator, and otherwise powering the commercial power. In addition, the voltage and frequency of the commercial power output end and the diesel generator output end can be directly detected for judgment (namely, judgment is carried out through a detection point before the automatic transfer switch).
Referring to fig. 3, in another embodiment of the control method of the present application, when the mains input terminal cannot supply power, for the step of controlling the ups to be in a standby state or a battery power supply state, the state may be determined by determining whether the battery can normally operate, which specifically includes:
301. judging whether a battery of the uninterrupted power supply can supply power or not;
specifically, whether the obtained battery voltage is in the preset second voltage range is determined, if yes, step 302 is executed, and if not, step 303 is executed;
when the mains input end cannot supply power, namely the voltage of the mains input end is not in a normal voltage range, or the frequency of the mains input end is not in a normal frequency range, the uninterruptible power supply is required to be controlled to be in a standby state or a battery power supply state. The voltage of the battery in the uninterruptible power supply is obtained, whether the voltage of the battery is in a preset second voltage range or not is judged, if so, the battery voltage is normal, the battery can be in a battery energy supply state, and if not, the battery voltage is abnormal, and the uninterruptible power supply is required to be in a standby state.
302. Controlling the uninterruptible power supply to be in a battery energy supply state;
the load is powered by the battery when the battery voltage is in the second voltage range. Specifically, the energy of the battery is input to a direct current conversion module of the uninterruptible power supply, the direct current conversion module outputs direct current to an inversion module of the uninterruptible power supply, and the inversion module converts the direct current into alternating current and outputs the alternating current to a load so as to supply energy to the load. Correspondingly, the internal connection relation of the UPS is as follows: the utility power input terminal supplies power to the load through the PFC (power factor correction) module, the bus and the inverter module, and the dc input terminal is connected to the bus through the dc conversion module. In the present invention, the internal connection relationship and circuit form of the UPS do not belong to the innovative content of the present invention, and are not limited in detail herein, and it should be understood that the present invention is applicable to all types of UPS.
303. Controlling the uninterrupted power supply to be in a standby state;
when the mains supply input end cannot supply power and the battery voltage is not in the second voltage range, the UPS is not provided with a power supply capable of supplying power, and the uninterruptible power supply is controlled to be in a standby state. At this time, the PFC module, the dc conversion module, and the inverter module of the uninterruptible power supply stop outputting externally.
In still another embodiment of the control method of the present application, the step of controlling the plurality of uninterruptible power supplies to switch from the current state to the power supply state of the mains input end specifically includes:
and controlling the switch connected with the mains supply input end to be turned on, and delaying to disconnect the switch connected with the direct current input end of the uninterrupted power supply based on a preset second delay time period so as to supply energy to the load through the mains supply input end.
It will be appreciated that in addition to the conversion module (i.e. the PFC module mentioned above) a switch (i.e. the first switch) is connected in series between the mains input and the bus for controlling the supply path of the mains input to the bus, and a switch (i.e. the second switch) is also connected in series between the dc input and the bus for controlling the supply path of the dc input to the bus. Because the time required for switching the switch (usually understood to be relatively short, but not instantaneously completed), when the uninterruptible power supply is switched from the current state to the power supply state of the mains supply input end, the second switch is opened in a delayed manner, so that the switch is controlled in place in the switching process, and the situation that the battery power supply passage is opened and the mains supply power supply passage is not closed is avoided, and the load is powered off.
It can be appreciated that the control manner described above can be used to switch the ups from the current state to the mains input powered state, whether it is time-division or simultaneous.
In yet another embodiment of the control method of the present invention, after controlling the plurality of uninterruptible power supplies to switch from the current state to the power supply state of the mains input, loop parameters of the conversion module connected to the mains input may be further reduced. It is understood that the conversion module at the mains input, i.e. the PFC module (power factor correction module) mentioned above.
Loop parameters of a conversion module connected to the mains input are reduced.
In order to improve the adaptability of the UPS, loop parameters of the power factor correction module can be reduced, particularly voltage feedforward filtering can be reduced, the effective value of the mains voltage is used as the voltage feedforward parameter, virtual impedance is added to the voltage feedforward, or the current sampling value is deepened and filtered. Furthermore, the judgment condition of the oscillation can be reduced, for example, the range of the identified normal voltage is enlarged or the range of the identified normal frequency is enlarged, and the abnormal switching caused by the fact that the proper oscillation is misjudged as abnormal in the normal switching process is avoided.
Referring to fig. 4, the present invention further provides an embodiment of an uninterruptible power supply, where the uninterruptible power supply includes a mains input for connecting to a diesel generator or a power grid and receiving energy of the diesel generator or the power grid; the direct current input end is used for being connected with a direct current power supply (namely a battery) and receiving the energy of the direct current power supply; the output end is used for connecting with a load and supplying energy to the load; the uninterruptible power supply further comprises a controller, wherein the controller is used for judging whether the mains supply input end can supply power or not, and controlling the uninterruptible power supply to be switched from the current state to the power supply state of the mains supply input end based on a preset first delay time period when the mains supply input end can supply power.
In another embodiment of the uninterruptible power supply, the controller further determines whether the utility power input end is powered by the diesel generator, and controls the uninterruptible power supply to be switched from the current state to the power supply state of the utility power input end based on a preset first delay period when the diesel generator is powered, and controls the uninterruptible power supply to be switched from the current state to the power supply state of the utility power input end when the utility power input end is not powered by the diesel generator.
Further, in this embodiment, the address may be used to obtain the first delay period, and the following formula may be used to confirm the first delay period, but is not limited to:
t= (uninterruptible power supply address-1) ×x;
wherein, T is the first delay time period, and x is the interval duration. The interval duration may be designed according to actual needs, and may be the same or different, and is not limited herein.
In this embodiment, when the UPS is applied to a diesel engine power generation scenario, the UPS can perform time delay switching into a diesel engine power supply state according to a preset rule, so that when a plurality of UPS share a diesel engine to generate power, the UPS is connected to the diesel engine at the same time, so that the output voltage of the diesel engine is pulled, and normal power supply cannot be performed.
Referring to fig. 5, the present invention provides a system embodiment including a plurality of uninterruptible power supplies as described above, wherein the system includes a diesel generator, an automatic transfer switch, and a plurality of uninterruptible power supplies, and the uninterruptible power supplies do not communicate with each other. The input end of the automatic transfer switch is respectively used for connecting the diesel generator and the power grid, the output end of the automatic transfer switch is connected with the mains supply input ends of a plurality of uninterruptible power supplies, and the output end of the uninterruptible power supplies is used for connecting loads and supplying energy to the loads.
The utility power supply or the diesel generator supply can be selected by controlling the automatic transfer switch, and the uninterrupted power supplies are respectively connected with the loads so as to supply power to the corresponding loads. The number of uninterruptible power supplies is not limited, and can be selected according to actual requirements and objective conditions, and the uninterruptible power supplies are not limited in specific.
In this embodiment, since the system includes a plurality of uninterruptible power supplies, each UPS corresponds to a different first delay time, that is, each UPS performs switching at a different point in time, so as to switch from the current state to the mains supply state. Therefore, when the current state is switched to the mains supply energy supply state, the voltage of the mains supply input end is not pulled down to be out of the normal voltage range, repeated switching is avoided, and the power supply stability of the system is ensured.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.
It should be noted that, although the steps in the flowcharts of the embodiments are drawn sequentially as indicated by arrows, the steps are not strictly limited to the order in which the steps are executed unless explicitly stated in the present disclosure. Moreover, at least some of the steps in the flowcharts in accordance with the embodiments may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily performed sequentially, but may be performed alternately or alternately with at least a part of the steps or stages in other steps or other steps.
In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods may be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., 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 with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
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 each embodiment 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 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 technical solution of the present application may be embodied in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a storage medium, including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk, or the like, which can store program codes.
Claims (9)
1. A method of controlling a system comprising a plurality of uninterruptible power supplies, the system comprising a diesel generator, an output of the diesel generator being connected to a utility input of the uninterruptible power supplies, the utility input being further for connection to a power grid, the plurality of uninterruptible power supplies not communicating with one another, the method comprising:
judging whether the commercial power input end can supply power or not;
if so, the uninterrupted power supplies are controlled to be switched from the current state to the power supply state of the mains supply input end one by one based on preset different first delay time periods, and the current state is a standby state or a battery power supply state.
2. The control method according to claim 1, wherein if the utility power input terminal is capable of supplying power, the method further comprises, before the plurality of uninterruptible power supplies are controlled to switch from the current state to the utility power input terminal power supply state one by one based on a preset different first delay period:
judging whether the commercial power input end is powered by the diesel generator or not;
if yes, executing the step of controlling the uninterrupted power supplies to be switched from the current state to the energy supply state of the mains supply input end one by one based on the preset different first time delay time periods;
if not, the uninterrupted power supplies are controlled to be switched from the current state to the energy supply state of the mains supply input end.
3. The control method according to claim 1, wherein the determining whether the utility power input terminal can supply power includes:
acquiring the voltage of a mains supply input end and the frequency of the mains supply input end;
judging whether the voltage of the mains supply input end is in a preset first voltage range and the frequency of the mains supply input end is in a preset first frequency range at present;
if yes, determining that the commercial power input end can supply power;
if not, the uninterruptible power supply is controlled to be in the standby state or the battery energy supply state.
4. A control method according to claim 3, wherein if the mains input is not available, the method further comprises, prior to controlling the uninterruptible power supply to be in the standby state or the battery-powered state:
judging whether a battery of the uninterruptible power supply can supply power or not;
the controlling the uninterruptible power supply in the standby state or the battery-powered state includes:
if the battery can supply power, the uninterruptible power supply is controlled to be in the battery energy supply state;
and if the battery can not supply power, controlling the uninterrupted power supply to be in the standby state.
5. The control method according to claim 4, wherein the determining whether the battery of the uninterruptible power supply can supply power specifically comprises:
judging whether the acquired battery voltage is in a preset second voltage range;
if yes, determining that the battery can supply power;
if not, determining that the battery cannot supply power.
6. The control method according to claim 1, wherein the controlling the plurality of uninterruptible power supplies to switch from a current state to a mains input powered state comprises:
and controlling the switch connected with the mains supply input end to be turned on, and delaying to disconnect the switch connected with the direct current input end of the uninterrupted power supply based on a preset second delay time period so as to supply energy to a load through the mains supply input end.
7. The control method of claim 1, wherein after the controlling the plurality of uninterruptible power supplies to switch from the current state to the mains input energized state, the method further comprises:
and reducing loop parameters of a conversion module of the uninterruptible power supply connected with the mains supply input end.
8. An uninterruptible power supply, characterized in that: the uninterruptible power supply performs the method of any of claims 1 to 7.
9. A system including a plurality of uninterruptible power supplies, the system comprising: a diesel generator, an automatic transfer switch, a plurality of uninterruptible power supplies as claimed in claim 8, wherein the uninterruptible power supplies are not in communication with each other;
the input end of the automatic transfer switch is respectively used for connecting the diesel generator and the power grid, the output end of the automatic transfer switch is connected with the mains supply input ends of a plurality of uninterruptible power supplies, and the output end of the uninterruptible power supplies is used for connecting loads and supplying energy to the loads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310336588.7A CN116436149A (en) | 2023-03-31 | 2023-03-31 | Uninterruptible power supply, system including a plurality of uninterruptible power supplies, and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310336588.7A CN116436149A (en) | 2023-03-31 | 2023-03-31 | Uninterruptible power supply, system including a plurality of uninterruptible power supplies, and control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116436149A true CN116436149A (en) | 2023-07-14 |
Family
ID=87090098
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310336588.7A Pending CN116436149A (en) | 2023-03-31 | 2023-03-31 | Uninterruptible power supply, system including a plurality of uninterruptible power supplies, and control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116436149A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116885802A (en) * | 2023-07-19 | 2023-10-13 | 屹晶微电子(台州)有限公司 | Bidirectional inverter charging power coordination control method, system and storage medium |
-
2023
- 2023-03-31 CN CN202310336588.7A patent/CN116436149A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116885802A (en) * | 2023-07-19 | 2023-10-13 | 屹晶微电子(台州)有限公司 | Bidirectional inverter charging power coordination control method, system and storage medium |
| CN116885802B (en) * | 2023-07-19 | 2024-02-27 | 屹晶微电子(台州)有限公司 | Bidirectional inverter charging power coordination control method, system and storage medium |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2846437B1 (en) | Uninterrupted power supply method and uninterrupted power supply | |
| CN105406580B (en) | A kind of electric power system and method | |
| WO2022166289A1 (en) | Off-grid start method and system for new energy power generation system | |
| CN116436149A (en) | Uninterruptible power supply, system including a plurality of uninterruptible power supplies, and control method | |
| CN103502649B (en) | A kind of system and method for the accessory power supply of the frequency changer being remotely connected and disconnected from for the variable displacement compressor used in a cooling system | |
| CN106611997B (en) | Electric power supply system and method are not powered off | |
| CN109274088B (en) | Energy control method, energy control device, energy management system and storage medium | |
| CN111725879A (en) | Light-storage combined power supply mobile energy storage system and control method thereof | |
| CN112060940B (en) | Method for prolonging discharge of motor train unit storage battery | |
| CN109378897A (en) | A kind of ups system and its control method of CB common battery group | |
| CN110266100A (en) | Power supply switch circuit and power-supply switching method | |
| WO2010111828A1 (en) | Power supply system and method | |
| CN110445421B (en) | Starting circuit of motor, control method of starting circuit and engineering machinery | |
| CN111817416A (en) | Wireless charging system starting control method and device and wireless charging system | |
| CN112039060B (en) | Control method and device applied to power supply circuit, terminal and storage medium | |
| CN113708405B (en) | Energy storage off-grid inverter, control method thereof and energy storage off-grid inverter system | |
| CN110661293B (en) | Sleep control and quick wake-up method for inverter parallel operation system | |
| CN112366812A (en) | Energy-saving mode control method and device of uninterruptible power supply | |
| CN113179011B (en) | Power supply circuit, control method thereof, capacitor discharge circuit and power conversion circuit | |
| CN110768254B (en) | Power supply circuit, control method and device of power supply circuit and air conditioner | |
| CN212875397U (en) | A pass through control circuit for unusual voltage | |
| EP4152550A1 (en) | Non-current-sharing ups apparatus, shunting method, and ups parallel connection system | |
| CN116865346B (en) | Energy storage inverter grid-connected and off-grid switching method, system, electronic equipment and storage medium | |
| CN112003362B (en) | Control method of power supply system and related device | |
| RU63615U1 (en) | TWO-MACHINE POWER UNIT |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |