CN118318369A - Power supply terminal, power supply system, power supply control method, and storage medium - Google Patents

Power supply terminal, power supply system, power supply control method, and storage medium

Info

Publication number
CN118318369A
CN118318369A CN202280007183.2A CN202280007183A CN118318369A CN 118318369 A CN118318369 A CN 118318369A CN 202280007183 A CN202280007183 A CN 202280007183A CN 118318369 A CN118318369 A CN 118318369A
Authority
CN
China
Prior art keywords
power supply
input
load
bidirectional converter
energy storage
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
Application number
CN202280007183.2A
Other languages
Chinese (zh)
Inventor
宫新光
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hangpei Technology Shenzhen Co ltd
Original Assignee
Hangpei Technology Shenzhen Co ltd
Filing date
Publication date
Application filed by Hangpei Technology Shenzhen Co ltd filed Critical Hangpei Technology Shenzhen Co ltd
Publication of CN118318369A publication Critical patent/CN118318369A/en
Pending legal-status Critical Current

Links

Abstract

A power supply terminal, a power supply system, a power supply control method, and a storage medium. The power supply terminal (200) is used for forming a power grid interaction loop through a first input power supply (101), a first bidirectional converter (201) and an energy storage unit (104), and the second input power supply (102) and the load (103) are used for forming a load power supply loop; the controller (205) controls the first switching switch (204) to be opened so as to isolate the power grid interaction loop from the load power supply loop; the controller (205) controls the first switch (204) to be conducted so as to conduct the power grid interaction loop and the load power supply loop, load power supply and power grid interaction can be simultaneously realized in the same set of device, the usability of the load power supply is improved, the equipment cost is reduced, and meanwhile, the power quality and the stability of the power grid are improved.

Description

Power supply terminal, power supply system, power supply control method, and storage medium Technical Field
The present invention relates to the technical field of power supplies, and in particular, to a power supply terminal, a power supply system, a power supply control method, and a storage medium.
Background
UPS (Uninterruptible Power System) is an ac power source that includes an energy storage device, such as a battery, that can be used to provide uninterrupted power to a load during a power outage. As a power supply guarantee device, it is very widely used in the power supply and distribution field.
At present, the field of data centers actively develops 'source network charge storage', takes the data centers as loads to consume new energy for power supply, and simultaneously builds a local energy storage system to adjust unbalance between power consumption and power generation of a power grid caused by instability of new energy power supply. But in general, two sets of completely independent systems are used for load power supply and peak regulation and frequency modulation, the usability of the load power supply is poor, and the equipment cost is high.
Disclosure of Invention
The invention provides a power supply terminal, a power supply system, a power supply control method and a storage medium, which can simultaneously realize load power supply and power grid interaction in the same set of device, increase the usability of load power supply, reduce the equipment cost and improve the power quality and stability of a power grid.
In order to solve the technical problems, the invention adopts a technical scheme that: provided is a power supply terminal including:
The first bidirectional converter comprises a direct current side and an alternating current side, and the direct current side of the first bidirectional converter is used for being connected with the energy storage unit;
a first ac bus including a first end for connecting a first input power source and a second end for connecting an ac side of the first bidirectional converter;
The second alternating current bus comprises an alternating current input end used for being connected with a second input power supply and an alternating current output end used for being connected with a load;
One end of the first change-over switch is connected with the first end, and the other end of the first change-over switch is connected with the alternating current input end; and
The controller is connected with the first bidirectional converter and the first change-over switch;
The first input power supply, the first bidirectional converter and the energy storage unit are used for forming a power grid interaction loop, the second input power supply and the load are used for forming a load power supply loop, the power grid interaction loop is used for converting alternating current input by the first end into direct current through the first bidirectional converter so as to charge the energy storage unit or converting direct current of the energy storage unit into alternating current through the first bidirectional converter so as to feed the first end, and the load power supply loop is used for supplying alternating current input by the alternating current input end to the load; the controller controls the first change-over switch to be disconnected so as to isolate the power grid interaction loop from the load power supply loop; the controller controls the first switching switch to be conducted so as to conduct the power grid interaction loop and the load power supply loop.
According to one embodiment of the invention, the power supply terminal further comprises a second bidirectional converter and a second change-over switch, wherein the second bidirectional converter and the second change-over switch are respectively connected with the controller, the second bidirectional converter comprises a direct current side and an alternating current side, the direct current side of the second bidirectional converter is connected with the energy storage unit, the alternating current side of the second bidirectional converter is commonly connected with the first change-over switch, the second change-over switch and the alternating current output end, the second change-over switch is arranged between the alternating current input end and the alternating current output end and used for conducting/disconnecting the load power supply loop, and the energy storage unit, the second bidirectional converter and the load form an uninterrupted power supply loop which is used for converting direct current of the energy storage unit into alternating current through the second bidirectional converter to supply power for the load.
According to one embodiment of the invention, the first and second switches are static or mechanical switches.
According to one embodiment of the invention, the energy storage unit comprises a first energy storage unit and a second energy storage unit, the first energy storage unit is connected with the direct current side of the first bidirectional converter, the second energy storage unit is connected with the direct current side of the second bidirectional converter, the first input power source, the first bidirectional converter and the first energy storage unit form a power grid interaction loop, and the second energy storage unit, the second bidirectional converter and the load form an uninterrupted power supply loop.
According to one embodiment of the invention, the power supply terminal further comprises a rectifier connected to the controller, the rectifier comprising a dc side and an ac side, the dc side of the rectifier being connected to the dc side of the second bi-directional converter, the ac side of the rectifier being connected to the second input power source.
In order to solve the technical problems, the invention adopts another technical scheme that: there is provided a power supply system including:
The power supply terminal;
the first input power supply is connected to the first end of the power supply terminal;
the second input power supply is connected to the alternating current input end of the power supply terminal;
The load is connected to the alternating current output end of the power supply terminal;
An energy storage unit connected to a direct current side of the first bidirectional converter at the power supply terminal;
the first input power supply supplies power for output and input in a bidirectional mode, and the second input power supply supplies power for unidirectional output.
According to one embodiment of the invention, the load comprises a first input terminal connected to the ac input terminal and a second input terminal connected to the ac side of the second bidirectional converter.
According to one embodiment of the invention, the load comprises a first input terminal connected to the ac input terminal and a second input terminal connected to the dc side of the second bidirectional converter.
According to one embodiment of the invention, the load comprises a first input terminal connected to the ac side of the second bi-directional converter and a second input terminal connected to the dc side of the second bi-directional converter.
According to one embodiment of the invention, the load comprises a first input and a second input, both connected to the ac side of the second bidirectional converter.
According to one embodiment of the invention, a plurality of power grid interaction loops are arranged, the power grid interaction loops are mutually independent, and the load power supply loop is connected with each power grid interaction loop through the first change-over switch.
According to one embodiment of the invention, a plurality of load power supply loops are arranged, the load power supply loops are mutually independent, and the power grid interaction loop is connected with each load power supply loop through the first change-over switch.
In order to solve the technical problems, the invention adopts another technical scheme that: the power supply control method is applied to a power supply terminal, the power supply terminal comprises a first bidirectional converter, a first alternating current bus, a second alternating current bus, a first change-over switch and a controller, the first bidirectional converter comprises a direct current side and an alternating current side, the direct current side of the first bidirectional converter is used for being connected with an energy storage unit, the first alternating current bus comprises a first end used for being connected with a first input power source and a second end used for being connected with the alternating current side of the first bidirectional converter, the second alternating current bus comprises an alternating current input end used for being connected with a second input power source and an alternating current output end used for being connected with a load, one end of the first change-over switch is connected with the first end, the other end of the first change-over switch is connected with the alternating current input end, the controller is connected with the first bidirectional converter and the first change-over switch, the first input power source, the first bidirectional converter and the energy storage unit form an electric network interaction loop, the second input power source and the load form a load power supply loop, and the electric network interaction loop is used for inputting alternating current to the first power source through the first power converter to the first alternating current power supply unit through the energy storage unit to the first alternating current input power supply loop; the power supply control method comprises the following steps:
acquiring the state of a first change-over switch;
When the state of the first change-over switch is in an off state, the controller controls the power grid interaction loop and the load power supply loop to work independently;
When the state of the first change-over switch is in a conducting state, the first input power supply or the second input power supply supplies power to the load, and/or the controller controls the direct current of the energy storage unit to be converted into alternating current through the first bidirectional converter and supplies power to the load through the first change-over switch.
According to an embodiment of the present invention, the power supply terminal further includes a second bidirectional converter and a second change-over switch respectively connected to the controller, the second bidirectional converter including a dc side and an ac side, the dc side of the second bidirectional converter being connected to the energy storage unit, the ac side of the second bidirectional converter being commonly connected to the first change-over switch, the second change-over switch, and the ac output, the second change-over switch being provided between the ac input and the ac output for turning on/off the load power supply loop, the energy storage unit, the second bidirectional converter, and the load forming an uninterruptible power supply loop for converting dc power of the energy storage unit into ac power through the second bidirectional converter to supply power to the load, the power supply control method includes:
acquiring the state of the first change-over switch and the state of the second change-over switch;
If the state of the first change-over switch is in an off state and the state of the second change-over switch is in an on state, when the input of the first input power supply and the second input power supply is normal, the controller controls the power grid interaction loop and the load power supply loop to work independently;
if the state of the first change-over switch is in a conducting state and the state of the second change-over switch is in a disconnecting state, judging whether the energy storage unit can feed the first input power supply and supply the load when the input of the first input power supply and the second input power supply is normal;
if so, when the capacity value of the energy storage unit reaches a preset value, the controller controls the first bidirectional converter to stop feeding the direct current of the energy storage unit to the first input power supply, and the load is powered through the energy storage unit and/or the first input power supply.
According to an embodiment of the present invention, after the state of the first switch is an on state and the state of the second switch is an off state, the method further includes:
When the input of the first input power supply is normal and the input of the second input power supply is abnormal, the controller controls the first bidirectional converter to be in a dormant mode, so that alternating current output by the first input power supply supplies power to the load through the first change-over switch.
According to an embodiment of the present invention, after the state of the first switch is an on state and the state of the second switch is an off state, the method further includes:
When the input of the first input power supply and the second input power supply is abnormal, the controller controls the direct current of the energy storage unit to supply power to the load through the first bidirectional converter and/or the second bidirectional converter.
According to an embodiment of the present invention, after the state of the first switch is an off state and the state of the second switch is an on state, the method further includes:
When the input of the first input power supply is normal and the input of the second input power supply is abnormal, the controller controls the alternating current output by the first input power supply to supply power to the load through the first bidirectional converter and the second bidirectional converter.
According to an embodiment of the present invention, after the state of the first switch is an off state and the state of the second switch is an on state, the method further includes:
when the input of the first input power supply and the second input power supply is abnormal, the controller controls the second bidirectional converter to convert the direct current of the energy storage unit into alternating current to supply power for the load.
According to one embodiment of the present invention, the energy storage unit includes a first energy storage unit and a second energy storage unit, the first energy storage unit is connected to the dc side of the first bidirectional converter, the second energy storage unit is connected to the dc side of the second bidirectional converter, the first input power source, the first bidirectional converter and the first energy storage unit form a power grid interaction loop, the second energy storage unit, the second bidirectional converter and the load form an uninterruptible power supply loop, and if the state of the first switch is an off state and the state of the second switch is an on state, the method further includes:
When the input of the first input power supply and the second input power supply is normal, the controller controls the power grid interaction loop and the load power supply loop to work independently;
when the input of the first input power supply is normal and the input of the second input power supply is abnormal, the controller controls the second energy storage unit of the uninterruptible power supply loop to supply power to the load.
In order to solve the technical problems, the invention adopts a further technical scheme that: there is provided a computer storage medium having stored thereon a computer program which, when executed by a processor, implements the above-described power supply control method.
The beneficial effects of the invention are as follows: the first input power supply, the first bidirectional converter and the energy storage unit are used for forming a power grid interaction loop, and the second input power supply and the load are used for forming a load power supply loop; the controller controls the first change-over switch to be disconnected so as to isolate the power grid interaction loop from the load power supply loop; the controller controls the first switch to be conducted so as to conduct the power grid interaction loop and the load power supply loop, load power supply and power grid interaction can be simultaneously realized in the same set of device, the usability of load power supply is improved, the equipment cost is reduced, and meanwhile, the power quality and the stability of the power grid are improved.
Drawings
FIG. 1 is a schematic diagram of a power supply system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a power supply system according to another embodiment of the present invention;
FIG. 3 is a schematic diagram of a power supply system according to another embodiment of the present invention;
FIG. 4 is a schematic diagram of a connection mode of a load in a power supply system according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a power supply system according to another embodiment of the present invention;
FIG. 6 is a schematic diagram of a power supply system according to another embodiment of the present invention;
FIG. 7 is a schematic diagram of a power supply system according to another embodiment of the present invention;
FIG. 8 is a flow chart of a power supply control method according to an embodiment of the invention;
FIG. 9 is a flow chart of a power supply control method according to an embodiment of the invention;
FIG. 10 is a flow chart of a power supply control method according to an embodiment of the invention;
FIG. 11 is a flow chart of a power supply control method according to an embodiment of the invention;
Fig. 12 is a schematic structural view of a computer storage medium according to an embodiment of the present invention.
The meaning of the reference numerals in the drawings are:
100-a power supply system; 200-a power supply terminal; 101-a first input power source; 102-a second input power source; 103-loading; 104-an energy storage unit; 201-a first bidirectional converter; 202-a first ac busbar; 203-a second ac busbar; 204-a first switch; 205-a controller; 206-a second bidirectional converter; 207-a second change-over switch; 1041-a first energy storage unit; 1042-a second energy storage unit; 208-rectifier; 105-a grid interactive loop; 106-load supply loop.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The terms "first," "second," "third," and the like in this disclosure are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", and "a third" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise. All directional indications (such as up, down, left, right, front, back … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular gesture (as shown in the drawings), and if the particular gesture changes, the directional indication changes accordingly. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the invention. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
Fig. 1 is a schematic structural diagram of a power supply system according to an embodiment of the invention, please refer to fig. 1, the power supply system 100 includes: power supply terminal 200, first input power source 101, second input power source 102, load 103, and energy storage unit 104.
Further, the first input power source 101 and the second input power source 102 are independent from each other, and the first input power source 101 and the second input power source 102 may have different voltages, frequencies, or phases. Wherein the first input power 101 supplies power to both the output and the input and the second input power 102 supplies power to the unidirectional output.
Further, the energy storage unit 104 may be an electrochemical energy storage, such as an energy storage battery, or may be a mechanical energy storage, such as an energy storage flywheel.
Further, the load 103 may be a single power load or a dual power load. If the load 103 is a single power load, the load 103 has only one input terminal; if the load 103 is a dual-power load, the load 103 has two input terminals, which include a first input terminal and a second input terminal, where both the first input terminal and the second input terminal can support input of alternating current or direct current, and the first input terminal and the second input terminal are redundant backups.
In one implementation, referring to fig. 1, the power terminal 200 includes a first bidirectional converter 201, a first ac bus 202, a second ac bus 203, a first switch 204, and a controller 205. The first bidirectional converter 201 includes a dc side and an ac side, and the dc side of the first bidirectional converter 201 is used to connect to the energy storage unit 104. The first ac bus 202 includes a first end (not shown) for connecting to the first input power source 101 and a second end (not shown) for connecting to the ac side of the first bidirectional converter 201. The second ac bus 203 includes an ac input terminal (not shown) for connecting to the second input power source 102 and an ac output terminal (not shown) for connecting to the load 103. One end of the first switch 204 is connected to the first end, and the other end of the first switch 204 is connected to the ac input end. The controller 205 is connected to the first bidirectional converter 201 and the first switch 204, respectively.
In this embodiment, the first input power source 101, the first bi-directional converter 201 and the energy storage unit 104 form a grid interaction loop, and the second input power source 102 and the load 103 form a load power supply loop. The power grid interaction loop is used for converting alternating current input by the first end into direct current through the first bidirectional converter 201 to charge the energy storage unit 104 or converting direct current output by the energy storage unit 104 into alternating current through the first bidirectional converter 201 to feed active power and/or reactive power to the first end, so that dynamic balance of power consumption and power generation of a power grid is adjusted, and the power quality and stability of the power grid are improved; the load power supply circuit is used for supplying the load 103 with alternating current input by the alternating current input end. The controller 205 controls the first switch 204 to be turned off to isolate the grid interaction loop from the load power supply loop; the controller 205 controls the first switch 204 to be turned on to turn on the power grid interaction loop and the load power supply loop, so that power supply of the load 103 and power grid interaction are realized in the same set of device, power supply availability of the load 103 is increased, and equipment cost is reduced.
Based on the above embodiment, in an implementation manner, referring to fig. 2, the power supply terminal 200 further includes a second bidirectional converter 206 and a second change-over switch 207, which are respectively connected to the controller 205, the second bidirectional converter 206 includes a dc side and an ac side, the dc side of the second bidirectional converter 206 is connected to the energy storage unit 104, the ac side of the second bidirectional converter 206 is commonly connected to the first change-over switch 204, the second change-over switch 207, and the ac output terminal, the second change-over switch 207 is disposed between the ac input terminal and the ac output terminal, and is used for turning on/off a load power supply circuit, and the energy storage unit 104, the second bidirectional converter 206, and the load 103 form an uninterruptible power supply circuit, where the uninterruptible power supply circuit is used for converting the dc power output by the energy storage unit 104 into ac through the second bidirectional converter 206 to supply the load 103 when the second input power source 102 fails.
Further, the first and second switches 204, 207 are static or mechanical switches, preferably static switches, which have a very short switching time (less than 10 ms) so that the power supply to the switching process load 103 is not interrupted.
Based on the above embodiment, in one implementation manner, referring to fig. 3, the energy storage unit 104 includes a first energy storage unit 1041 and a second energy storage unit 1042, the first energy storage unit 1041 is connected to the dc side of the first bidirectional converter 201, the second energy storage unit 1042 is connected to the dc side of the second bidirectional converter 206, the first input power source 101, the first bidirectional converter 201 and the first energy storage unit 1041 form a power grid interaction loop, and the second energy storage unit 1042, the second bidirectional converter 206 and the load 103 form an uninterruptible power supply loop.
Further, the first energy storage unit 1041 and the second energy storage unit 1042 of the present embodiment may be electrochemical energy storage, such as an energy storage battery, or mechanical energy storage, such as an energy storage flywheel.
Based on the above embodiment, in an implementation manner, when the load 103 includes a first input terminal (not shown in the figure) and a second input terminal (not shown in the figure), there may be the following connection manner, please refer to fig. 4 (a), where the first input terminal is connected to the ac input terminal, and the second input terminal is connected to the ac side of the second bidirectional converter 206; referring to fig. 4 (b), a first input terminal is connected to the ac input terminal, and a second input terminal is connected to the dc side of the second bidirectional converter 206; referring to fig. 4 (c), a first input terminal is connected to the ac side of the second bidirectional converter 206, and a second input terminal is connected to the dc side of the second bidirectional converter 206; referring to fig. 4 (d), the first input terminal and the second input terminal are both connected to the ac side of the second bidirectional converter 206.
Based on the above embodiment, in one implementation, referring to fig. 5, the power supply terminal 200 further includes a rectifier 208 connected to the controller 205, where the rectifier 208 includes a dc side and an ac side, the dc side of the rectifier 208 is connected to the dc side of the second bidirectional converter 206, and the ac side of the rectifier 208 is connected to the second input power source 102. The second input power source 102 may supply power to the load 103 through the second change-over switch 207, or convert the ac power of the second input power source 102 into dc power through the rectifier 208 and invert the dc power into ac power through the second converter 206 to supply power to the load 103, or invert the dc power of the second energy storage unit 1042 into ac power through the second bidirectional converter 206 to supply uninterrupted power to the load 103 when the second input power source 102 fails. On the basis of an uninterruptible power supply loop, the first energy storage unit 1041 and the first bidirectional converter 201 are used as backup uninterruptible power supplies, so that the usability of load power supply is improved.
Based on the above embodiment, in one possible implementation, referring to fig. 6, a plurality of power grid interaction circuits 105 are provided, the power grid interaction circuits 105 are independent from each other, and the load power supply circuit 103 is connected to each power grid interaction circuit 105 through a first switch 204. As shown in fig. 6, two power grid interaction loops 105 are provided, the power supply system 100 can expand a plurality of power grid interaction loops 105, the load power supply loop 106 is connected with each power grid interaction loop 105 through the first switch 204, uninterrupted power supply of the load power supply loop 106 is realized by turning on/off the first switch 204 of any power grid interaction loop 105, and the multi-loop redundant power supply capability of the load power supply loop 106 can be improved.
Based on the above embodiment, in one possible implementation, referring to fig. 7, a plurality of load power supply circuits 106 are provided, and the plurality of load power supply circuits 106 are independent from each other, and the grid interaction circuit 105 is connected to each load power supply circuit 106 through the first switch 204. As shown in fig. 7, two load power supply circuits 106 are provided, the power supply system 100 can expand a plurality of load power supply circuits 106, each load power supply circuit 106 is connected to the power grid interaction circuit 105 through the first switch 204, uninterrupted power supply is realized by turning on/off the first switch 204 of any load power supply circuit 106, and redundant power supply capacity of each load power supply circuit 106 is improved.
Fig. 8 is a flowchart of a power supply control method according to an embodiment of the invention. It should be noted that, if there are substantially the same results, the method of the present invention is not limited to the flow sequence shown in fig. 8. The power supply control method is applied to the power supply terminal shown in fig. 1, and as shown in fig. 8, the power supply control method includes the following steps:
step S800: the state of the first change-over switch is acquired.
In step S800, the state of the first change-over switch is controlled by the controller, including an off state and an on state.
Step S801: when the state of the first change-over switch is in an off state, the controller controls the power grid interaction loop and the load power supply loop to work independently.
In step S801, the controller controls the first switch to be turned off, and if the input of the first input power source and the second input power source is normal, the controller controls the power grid interaction loop and the load power supply loop to work independently. In the power grid interactive loop, alternating current input by the first input power supply is converted into direct current through the first bidirectional converter to charge the energy storage unit or the direct current of the energy storage unit is converted into alternating current through the first bidirectional converter to feed active power and/or reactive power to the first end of the first input power supply. In the load power supply loop, the load is supplied with power through the second input power supply, and the energy storage unit cannot supply power to the load under the condition that the second input power supply is normal.
If the input of the first input power supply is abnormal, the power grid interaction loop cannot work normally, and if the input of the second input power supply is abnormal, the load power supply loop cannot work normally, and the load is supplied with power through the energy storage unit.
Step S802: when the state of the first change-over switch is in a conducting state, the first input power supply or the second input power supply supplies power to the load, and/or the controller controls the direct current of the energy storage unit to be converted into alternating current through the first bidirectional converter and supplies power to the load through the first change-over switch.
In step S802, the controller controls the first switch to be turned on, and if the input of the first input power supply and the second input power supply is normal, the first input power supply or the second input power supply supplies power to the load; if the input of the first input power supply is normal and the input of the second input power supply is abnormal, the controller controls the first bidirectional converter to enter a sleep mode, and the alternating current input by the first input power supply supplies power to the load through the first switch; if the input of the first input power supply is abnormal and the input of the second input power supply is normal, the alternating current input by the second input power supply supplies power to the load, and at the moment, the energy storage unit cannot supply power to the load under the condition that the second input power supply is normal; if the input of the first input power supply and the second input power supply is abnormal, the first input power supply and the second input power supply cannot supply power to the load, and the controller controls the direct current of the energy storage unit to be converted into alternating current through the first bidirectional converter to supply power to the load.
In an implementation manner, the power supply control method is applied to the power supply terminal shown in fig. 2, referring to fig. 9, and the power supply control method further includes the following steps:
Step S901: the state of the first change-over switch and the state of the second change-over switch are obtained.
In step S901, the state of the first switch is controlled by the controller, including an off state and an on state, and the state of the second switch is controlled by the controller, including an off state and an on state.
Step S902: whether the state of the first change-over switch is an off state and the state of the second change-over switch is an on state is judged.
Step S903: if so, when the input of the first input power supply and the second input power supply is normal, the controller controls the power grid interaction loop and the load power supply loop to work independently.
In step S903, in the grid interactive loop, the ac power input by the first input power source is converted into dc power by the first bidirectional converter to charge the energy storage unit or the dc power of the energy storage unit is converted into ac power by the first bidirectional converter to feed the first terminal with active power and/or reactive power. In the load power supply loop, the load is supplied with power through the second input power supply, and the uninterrupted power supply loop can not supply power to the load under the condition that the second input power supply is normal.
Step S904: if not, judging whether the state of the first change-over switch is an on state and the state of the second change-over switch is an off state.
Step S905: if so, when the input of the first input power supply and the second input power supply is normal, judging whether the energy storage unit can feed the first input power supply and supply power to the load.
In step S905, when the state of the second switch is the off state, the second input power supply cannot supply power to the load, and the energy storage unit and/or the first input power supply power to the load. Specifically, when the first input power supply allows to output electric power, if the energy storage unit needs to be charged, the alternating current output by the first input power supply charges the energy storage unit through the first bidirectional converter, meanwhile, the alternating current output by the first input power supply supplies power to the load through the first change-over switch, and if the energy storage unit allows to discharge, the alternating current output by the first input power supply and the direct current of the energy storage unit are jointly output to supply power to the load through the alternating current inverted by the second bidirectional converter. The energy storage unit may feed the first input power source and power the load if the energy storage unit allows discharging when the first input power source does not allow the output power.
Step S906: if so, when the capacity value of the energy storage unit reaches a preset value, the controller controls the first bidirectional converter to stop feeding the direct current of the energy storage unit to the first input power supply, and the energy storage unit and/or the first input power supply are/is used for supplying power to the load.
In step S906, the preset value is a minimum capacity value that the energy storage unit can simultaneously feed the first input power source and supply power to the load, and when the capacity value of the energy storage unit reaches the preset value, the energy storage unit cannot simultaneously feed the first input power source and supply power to the load.
In one embodiment, the second bidirectional converter is controlled to be in a sleep mode, and when the load is a single-power load or a double-power load and one end of the load is connected with the alternating-current side of the second bidirectional converter, the first input power source supplies power to the load; when the load is a dual-power load and one end of the load is connected with the direct current side of the second bidirectional converter, the energy storage unit can provide direct current for the load.
In another possible embodiment, the second bidirectional converter is controlled in a normal operating mode, the load being supplied by the first input power source or by a combination of the energy storage unit and the first input power source. When the load is a dual-power load and one end of the load is connected with the direct current side of the second bidirectional converter, and the other end of the load is connected with the alternating current side of the second bidirectional converter, the first input power supply provides alternating current for the load, meanwhile, the first input power supply provides direct current for the load through the second bidirectional converter, and when the required power of the load exceeds the allowed input power of the second bidirectional converter (the input current of the bidirectional converter), the first input power supply provides direct current for the load through the second bidirectional converter and the energy storage unit together.
On the basis of the above embodiment, in one implementation manner, referring to fig. 10, after step S904, the power supply control method further includes:
step S907: if so, when the input of the first input power supply is normal and the input of the second input power supply is abnormal, the controller controls the first bidirectional converter to be in a dormant mode, so that the alternating current output by the first input power supply supplies power to the load through the first change-over switch.
In step S907, when the input of the second input power is abnormal, the second input power cannot supply power to the load, and the first input power and/or the energy storage unit may supply power to the load. When the load is a single-power load or a double-power load and one end of the load is connected with the alternating-current side of the second bidirectional converter, alternating current output by the first input power supply supplies power to the load through the first change-over switch, and the energy storage unit is not used as a backup power supply; when the load is a dual-power load and one end of the load is connected with the direct current side of the second bidirectional converter, the alternating current output by the first input power supply supplies power to the load through the first change-over switch and the second bidirectional converter, and the energy storage unit is used as a backup power supply.
Further, when the input of the first input power supply is normal and the input of the second input power supply is abnormal, the controller controls the first bidirectional converter and the second bidirectional converter to be in the sleep mode at the same time, and the first input power supply supplies power to the load. When the load is a single-power load or a double-power load and one end of the load is connected with the alternating-current side of the second bidirectional converter, the first input power supply provides alternating current for the load; when the load is a dual-power load and one end of the load is connected with the direct current side of the second bidirectional converter, the energy storage unit supplies direct current to the load.
On the basis of the above embodiment, in one implementation manner, referring to fig. 10, after step S904, the power supply control method further includes:
Step S908: if so, when the input of the first input power supply and the second input power supply is abnormal, the controller controls the direct current of the energy storage unit to supply power to the load through the first bidirectional converter and/or the second bidirectional converter.
In step S908, when the input of the first input power source and the second input power source is abnormal, neither the first input power source nor the second input power source can supply power to the load, and the load may be supplied with power by the energy storage unit, specifically, when the load is a single power load or a dual power load and one end of the load is connected to the ac side of the second bidirectional converter, in one embodiment, the controller controls the dc power of the energy storage unit to supply power to the load through the first bidirectional converter, in another embodiment, the controller controls the dc power of the energy storage unit to supply power to the load through the second bidirectional converter, and in yet another embodiment, the controller controls the dc power of the energy storage unit to supply power to the load through the first bidirectional converter and the second bidirectional converter, respectively. When the load is a dual-power load and one end of the load is connected with the direct current side of the second bidirectional converter, the energy storage unit can directly supply power to the load.
On the basis of the above embodiment, in one implementation manner, referring to fig. 10, after step S902, the power supply control method further includes:
step S909: if so, when the input of the first input power supply is normal and the input of the second input power supply is abnormal, the controller controls the alternating current output by the first input power supply to supply power to the load through the first bidirectional converter and the second bidirectional converter.
In step S909, when the input of the second input power supply is abnormal, the load cannot be supplied with power, and the load can be supplied with power by the first input power supply and/or the energy storage unit, but if the energy storage unit does not allow the load to be supplied with power, the controller controls the ac power output by the first input power supply to supply power to the load through the first bidirectional converter and the second bidirectional converter.
On the basis of the above embodiment, in one implementation manner, referring to fig. 10, after step S902, the power supply control method further includes:
Step S910: if so, when the input of the first input power supply and the second input power supply is abnormal, the controller controls the second bidirectional converter to convert the direct current of the energy storage unit into alternating current to supply power for the load.
In step S910, when the input of the first input power source and the second input power source is abnormal, the first input power source and the second input power source cannot supply power to the load, and when the load is a single power load or a dual power load and one end of the load is connected to the ac side of the second bidirectional converter, the controller controls the second bidirectional converter to convert the dc power of the energy storage unit into ac power to supply power to the load. When the load is a dual-power load and one end of the load is connected with the direct current side of the second bidirectional converter, the energy storage unit can directly supply power to the load.
In an implementation manner, the power supply control method is applied to the power supply terminal shown in fig. 3, please refer to fig. 11, and after step S902, the power supply control method further includes the following steps:
Step S911: when the input of the first input power supply and the second input power supply is normal, the controller controls the power grid interaction loop and the load power supply loop to work independently.
In step S911, in the grid interactive loop, the alternating current input by the first input power source is converted into direct current by the first bidirectional converter to charge the first energy storage unit or the direct current of the first energy storage unit is converted into alternating current by the first bidirectional converter to feed the first end with active power and/or reactive power. In the load power supply loop, the load is powered by the second input power supply, and the second energy storage unit of the uninterrupted power supply loop cannot power the load under the condition that the second input power supply is normal.
Step S912: when the input of the first input power supply is normal and the input of the second input power supply is abnormal, the controller controls the second energy storage unit of the uninterrupted power supply loop to supply power to the load.
In step S912, when the input of the second input power is abnormal, the second input power cannot supply power to the load, and the second energy storage unit of the uninterruptible power supply circuit supplies power to the load. When the input of the first input power supply is normal, the power grid interaction loop works normally.
In other embodiments, if the state of the first switch is an on state and the state of the second switch is an off state, one or more of the first input power, the first energy storage unit, and the second energy storage unit supplies power to the load when the input of the first input power is normal. When the input of the first input power supply is abnormal, the first energy storage unit and/or the second energy storage unit supply power to the load.
According to the power supply control method provided by the embodiment of the invention, the load power supply and the power grid interaction are realized in the same set of device, so that the usability of the load power supply is increased, the equipment cost is reduced, and the power quality and the stability of the power grid are improved.
Referring to fig. 12, fig. 12 is a schematic structural diagram of a computer storage medium according to an embodiment of the present invention. The computer storage medium according to the embodiment of the present invention stores a program file 121 capable of implementing all the methods described above, where the program file 121 may be stored in the form of a software product in the computer storage medium, and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) to execute all or part of the steps of the methods described in the embodiments of the present invention. And the aforementioned computer storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, an optical disk, or other various media capable of storing program codes, or a terminal device such as a computer, a server, a mobile phone, a tablet, or the like.
In the several embodiments provided in the present invention, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of elements is merely a logical functional division, and there may be additional divisions of actual implementation, e.g., multiple elements 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.
In addition, each functional unit in the embodiments of the present invention 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 foregoing is only the embodiments of the present invention, and therefore, the patent scope of the invention is not limited thereto, and all equivalent structures or equivalent processes using the descriptions of the present invention and the accompanying drawings, or direct or indirect application in other related technical fields, are included in the scope of the invention.

Claims (20)

  1. A power supply terminal, characterized by comprising:
    The first bidirectional converter comprises a direct current side and an alternating current side, and the direct current side of the first bidirectional converter is used for being connected with the energy storage unit;
    a first ac bus including a first end for connecting a first input power source and a second end for connecting an ac side of the first bidirectional converter;
    The second alternating current bus comprises an alternating current input end used for being connected with a second input power supply and an alternating current output end used for being connected with a load;
    One end of the first change-over switch is connected with the first end, and the other end of the first change-over switch is connected with the alternating current input end; and
    The controller is connected with the first bidirectional converter and the first change-over switch;
    The first input power supply, the first bidirectional converter and the energy storage unit are used for forming a power grid interaction loop, the second input power supply and the load are used for forming a load power supply loop, the power grid interaction loop is used for converting alternating current input by the first end into direct current through the first bidirectional converter so as to charge the energy storage unit or converting direct current of the energy storage unit into alternating current through the first bidirectional converter so as to feed the first end, and the load power supply loop is used for supplying alternating current input by the alternating current input end to the load; the controller controls the first change-over switch to be disconnected so as to isolate the power grid interaction loop from the load power supply loop; the controller controls the first switching switch to be conducted so as to conduct the power grid interaction loop and the load power supply loop.
  2. The power supply terminal according to claim 1, further comprising a second bidirectional converter and a second change-over switch respectively connected to the controller, wherein the second bidirectional converter comprises a direct current side and an alternating current side, the direct current side of the second bidirectional converter is connected to the energy storage unit, the alternating current side of the second bidirectional converter is commonly connected to the first change-over switch, the second change-over switch and the alternating current output end, the second change-over switch is arranged between the alternating current input end and the alternating current output end and is used for switching on/off the load power supply loop, and the energy storage unit, the second bidirectional converter and the load form an uninterrupted power supply loop, and the uninterrupted power supply loop is used for converting direct current of the energy storage unit into alternating current through the second bidirectional converter to supply power for the load.
  3. The power terminal of claim 2, wherein the first and second switches are static or mechanical switches.
  4. The power terminal of claim 2, wherein the energy storage unit comprises a first energy storage unit and a second energy storage unit, the first energy storage unit is connected with the dc side of the first bidirectional converter, the second energy storage unit is connected with the dc side of the second bidirectional converter, the first input power source, the first bidirectional converter and the first energy storage unit form a grid interaction loop, and the second energy storage unit, the second bidirectional converter and the load form an uninterruptible power supply loop.
  5. The power terminal of claim 4, further comprising a rectifier coupled to the controller, the rectifier comprising a dc side and an ac side, the dc side of the rectifier coupled to the dc side of the second bidirectional converter, the ac side of the rectifier coupled to the second input power source.
  6. A power supply system, comprising:
    The power supply terminal according to any one of claims 1 to 5;
    the first input power supply is connected to the first end of the power supply terminal;
    the second input power supply is connected to the alternating current input end of the power supply terminal;
    The load is connected to the alternating current output end of the power supply terminal;
    An energy storage unit connected to a direct current side of the first bidirectional converter at the power supply terminal;
    the first input power supply supplies power for output and input in a bidirectional mode, and the second input power supply supplies power for unidirectional output.
  7. The power supply system of claim 6, wherein the load comprises a first input terminal and a second input terminal, the first input terminal being connected to the ac input terminal, the second input terminal being connected to the ac side of the second bidirectional converter.
  8. The power supply system of claim 6, wherein the load comprises a first input terminal and a second input terminal, the first input terminal being connected to the ac input terminal, the second input terminal being connected to the dc side of the second bidirectional converter.
  9. The power supply system of claim 6, wherein the load comprises a first input terminal and a second input terminal, the first input terminal being connected to the ac side of the second bi-directional converter, the second input terminal being connected to the dc side of the second bi-directional converter.
  10. The power supply system of claim 6, wherein the load comprises a first input and a second input, the first input and the second input each connected to an ac side of the second bi-directional converter.
  11. The power supply system according to claim 6, wherein a plurality of power grid interaction loops are provided, the plurality of power grid interaction loops are independent from each other, and the load power supply loop is connected with each power grid interaction loop through the first change-over switch.
  12. The power supply system according to claim 6, wherein a plurality of load power supply loops are provided, the plurality of load power supply loops are independent from each other, and the power grid interaction loop is connected with each load power supply loop through the first change-over switch.
  13. The power supply control method is characterized by being applied to a power supply terminal, wherein the power supply terminal comprises a first bidirectional converter, a first alternating current bus, a second alternating current bus, a first change-over switch and a controller, the first bidirectional converter comprises a direct current side and an alternating current side, the direct current side of the first bidirectional converter is used for being connected with an energy storage unit, the first alternating current bus comprises a first end used for being connected with a first input power supply and a second end used for being connected with the alternating current side of the first bidirectional converter, the second alternating current bus comprises an alternating current input end used for being connected with a second input power supply and an alternating current output end used for being connected with a load, one end of the first change-over switch is connected with the first end, the other end of the first change-over switch is connected with the alternating current input end, the controller is connected with the first bidirectional converter and the first change-over switch, the first input power supply, the first bidirectional converter and the energy storage unit form an interactive loop, the second input power supply and the load form a load power supply loop, and the power loop is used for inputting alternating current to the first power supply loop to the first direct current through the first input power supply loop to the first alternating current power supply unit through the energy storage unit; the power supply control method comprises the following steps:
    acquiring the state of a first change-over switch;
    When the state of the first change-over switch is in an off state, the controller controls the power grid interaction loop and the load power supply loop to work independently;
    When the state of the first change-over switch is in a conducting state, the first input power supply or the second input power supply supplies power to the load, and/or the controller controls the direct current of the energy storage unit to be converted into alternating current through the first bidirectional converter and supplies power to the load through the first change-over switch.
  14. The power supply control method according to claim 13, wherein the power supply terminal further includes a second bidirectional converter and a second change-over switch respectively connected to the controller, the second bidirectional converter including a dc side and an ac side, the dc side of the second bidirectional converter being connected to the energy storage unit, the ac side of the second bidirectional converter being commonly connected to the first change-over switch, the second change-over switch, the ac output, the second change-over switch being provided between the ac input and the ac output for turning on/off the load power supply circuit, the energy storage unit, the second bidirectional converter, and the load forming an uninterruptible power supply circuit for converting dc power of the energy storage unit into ac power through the second bidirectional converter to supply power to the load, the power supply control method comprising:
    acquiring the state of the first change-over switch and the state of the second change-over switch;
    If the state of the first change-over switch is in an off state and the state of the second change-over switch is in an on state, when the input of the first input power supply and the second input power supply is normal, the controller controls the power grid interaction loop and the load power supply loop to work independently;
    if the state of the first change-over switch is in a conducting state and the state of the second change-over switch is in a disconnecting state, judging whether the energy storage unit can feed the first input power supply and supply the load when the input of the first input power supply and the second input power supply is normal;
    if so, when the capacity value of the energy storage unit reaches a preset value, the controller controls the first bidirectional converter to stop feeding the direct current of the energy storage unit to the first input power supply, and the load is powered through the energy storage unit and/or the first input power supply.
  15. The power supply control method according to claim 14, wherein after the state of the first change-over switch is an on state and the state of the second change-over switch is an off state, further comprising:
    When the input of the first input power supply is normal and the input of the second input power supply is abnormal, the controller controls the first bidirectional converter to be in a dormant mode, so that alternating current output by the first input power supply supplies power to the load through the first change-over switch.
  16. The power supply control method according to claim 14, wherein after the state of the first change-over switch is an on state and the state of the second change-over switch is an off state, further comprising:
    When the input of the first input power supply and the second input power supply is abnormal, the controller controls the direct current of the energy storage unit to supply power to the load through the first bidirectional converter and/or the second bidirectional converter.
  17. The power supply control method according to claim 14, wherein after the state of the first change-over switch is an off state and the state of the second change-over switch is an on state, further comprising:
    When the input of the first input power supply is normal and the input of the second input power supply is abnormal, the controller controls the alternating current output by the first input power supply to supply power to the load through the first bidirectional converter and the second bidirectional converter.
  18. The power supply control method according to claim 14, wherein after the state of the first change-over switch is an off state and the state of the second change-over switch is an on state, further comprising:
    when the input of the first input power supply and the second input power supply is abnormal, the controller controls the second bidirectional converter to convert the direct current of the energy storage unit into alternating current to supply power for the load.
  19. The power supply control method according to claim 14, wherein the energy storage unit includes a first energy storage unit and a second energy storage unit, the first energy storage unit is connected to a dc side of the first bidirectional converter, the second energy storage unit is connected to a dc side of the second bidirectional converter, the first input power source, the first bidirectional converter, and the first energy storage unit form a power grid interactive loop, the second energy storage unit, the second bidirectional converter, and the load form an uninterruptible power supply loop, and further comprising, after the state of the first switch is an off state and the state of the second switch is an on state:
    When the input of the first input power supply and the second input power supply is normal, the controller controls the power grid interaction loop and the load power supply loop to work independently;
    when the input of the first input power supply is normal and the input of the second input power supply is abnormal, the controller controls the second energy storage unit of the uninterruptible power supply loop to supply power to the load.
  20. A computer storage medium having stored thereon a computer program, which when executed by a processor implements the power supply control method according to any one of claims 13-19.
CN202280007183.2A 2022-11-17 Power supply terminal, power supply system, power supply control method, and storage medium Pending CN118318369A (en)

Publications (1)

Publication Number Publication Date
CN118318369A true CN118318369A (en) 2024-07-09

Family

ID=

Similar Documents

Publication Publication Date Title
KR102110799B1 (en) Terminal and device
KR102213689B1 (en) Charging standby equipment and charging method
US11394211B2 (en) Charging method and apparatus for multiple cells, and electronic device
CN112379300A (en) Full-power operation test system, method and control method for power electronic transformer
CN118318369A (en) Power supply terminal, power supply system, power supply control method, and storage medium
JP2003319572A (en) Power control system for indoor equipment
WO2024103329A1 (en) Power supply terminal, power supply system, power supply control method, and storage medium
CN110544933A (en) control method and device of distributed direct current power supply system
CN114256956B (en) DC power supply system
CN114899936A (en) Power distribution circuit, method for controlling power supply of power distribution circuit and power supply system
CN114454720A (en) Train power supply control device, system and method
CN114243789A (en) Microgrid control method and device, microgrid main controller and storage medium
CN113381430A (en) Battery energy storage circuit based on UPS
CN118318367A (en) Power supply terminal, power supply system, power supply control method, and storage medium
WO2024103328A1 (en) Power supply terminal, power supply system, power supply control method, and storage medium
CN112366807A (en) Input current-limiting control method and device of uninterruptible power supply
EP4350943A1 (en) Operating with secondary power sources
CN110932348A (en) Electronic device charging system and charging method
US20240113553A1 (en) Reversed power and grid support with a modular approach
JP2003339127A (en) Uninterruptible power supply
CN210517893U (en) Diesel generator set control system for communication and data machine room
CN116436145A (en) Power supply device, power supply control method, and storage medium
CN114189010A (en) Charging circuit control method and device and computer readable storage medium
JP2022073548A (en) DC power supply system
CN116868467A (en) Power supply device, apparatus, control method, and storage medium

Legal Events

Date Code Title Description
PB01 Publication