CN114825318A - AC-DC hybrid uninterrupted power supply system - Google Patents

Abstract

The invention provides an AC-DC hybrid uninterruptible power supply system, which includes a mains power supply device, a DC power supply device, an AC power supply device and a DC/AC conversion device; the mains power supply device outputs a first line of mains and a second line of mains The DC power supply device is connected with the mains power supply device, and is used for converting the first mains power output by the mains power supply device into DC power, and while storing the DC power, the DC power is transported to the dual power supply load to carry out the dual power supply load. Power supply; the AC power supply device is connected to the mains power supply device, and is used to stabilize the second mains output from the mains power supply device and then send it to the dual power supply load to supply power to the dual power supply load; the DC/AC conversion device is connected to the DC power supply The device connection is used to convert the direct current converted by the direct current power supply device into alternating current power, and transmit the converted alternating current power to the alternating current power supply device. The invention can realize uninterrupted power supply for both AC and DC of dual power supply loads.

Description

An AC-DC hybrid uninterruptible power supply system

technical field

The invention relates to the technical field of power supply systems, and more particularly, to an AC-DC hybrid uninterruptible power supply system.

Background technique

The data center is the infrastructure supporting key digital services. Therefore, for the power supply system of the data center, it is necessary to ensure the high reliability and low cost of the power supply system at the same time. At present, IT equipment usually adopts dual power input. In order to ensure the high reliability of the operation of the power supply system of the data center, one method is to configure two uninterruptible power supply UPS to realize the uninterrupted power supply to the dual power supply load, but the operating cost of this system is very high; another method It adopts the power supply system of the first line of mains direct supply and one line of high-voltage DC power supply to supply power to the dual power supply load. Although this can improve the energy efficiency of the system and save operating costs, it cannot guarantee uninterrupted power supply and cannot meet the requirements of high reliability.

The Chinese patent CN210183090U published on July 17, 2019 provides an uninterruptible power supply circuit and an uninterruptible power supply device. The uninterruptible power supply circuit for continuously and uninterruptedly supplying power to a load includes: a main power supply circuit that outputs a power supply voltage; an output circuit, the output circuit is used to receive the power supply voltage output by the main power supply circuit to supply power to the load; a power supply module; a switch control circuit; a switch, the power supply module is connected to the output circuit through the switch, the The controlled end of the switch is connected to the control end of the switch control circuit; the switch control circuit is further configured to control the power supply module to output when the output voltage of the power supply module is greater than the output voltage of the output circuit circuit power supply; when the output voltage of the power supply module is lower than the output voltage of the output circuit, the power supply module is controlled to stop supplying power. This patent can realize uninterrupted power supply for a single type of load current, but cannot achieve uninterrupted power supply for both AC and DC loads with dual power sources.

SUMMARY OF THE INVENTION

The present invention provides an AC-DC mixed uninterruptible power supply system in order to overcome the above-mentioned defect that the prior art cannot guarantee both AC and DC uninterrupted power supply to dual power supply loads.

The technical scheme of the present invention is as follows:

The invention provides an AC-DC hybrid uninterruptible power supply system, the system includes a mains power supply device, a DC power supply device, an AC power supply device and a DC/AC conversion device;

The mains power supply device outputs the first mains power and the second mains, and the first mains and the second mains are mutually backup;

The DC power supply device is connected to the mains power supply device, and is used for converting the first mains power output from the mains power supply device into DC power, and while storing the DC power, the DC power is delivered to the dual power supply load to Power supply to dual power loads;

The AC power supply device is connected to the mains power supply device, and is used for stabilizing the second mains power output from the mains power supply device and then delivering it to the dual power supply load to supply power to the dual power supply load;

The DC/AC conversion device is connected to the DC power supply device, and is used for reconverting the DC power converted by the DC power supply device into AC power, and transmitting the converted AC power to the AC power supply device;

If the mains power supply device outputs the first mains power and the second mains power are normal, the DC power supply device converts the first mains power into DC power and transmits it to the dual power supply load; at the same time, the AC power supply device will The second mains power is delivered to the dual power load;

If any first mains power output from the mains power supply device fails, the other first mains power that is not faulty will be delivered to the DC power supply device and the AC power supply device at the same time, and then sent to the DC power supply device and the AC power supply device. to dual power loads;

If both the first mains and the second mains output by the mains power supply device are faulty, the DC power supply device transmits the stored DC power to the dual power supply load and the DC/AC conversion device at the same time, and the direct current /The AC conversion device converts the received DC power into AC power and sends it to the AC power supply device, and then sends it to the dual power load through the AC power supply device.

Preferably, the mains power supply device includes a first transformer, a first power distribution unit, a bus tie switch, a second transformer and a second power distribution unit;

The output end of the first transformer is connected to the DC power supply device through the first power distribution unit;

The output end of the second transformer is connected to the AC power supply device through a second power distribution unit;

The busbar tie switch connects the output end of the first transformer and the output end of the second transformer, and is used for mutual backup of the first line of commercial power and the second line of commercial power.

Preferably, the DC power supply device includes an AC/DC conversion unit, a battery pack and a DC power distribution unit;

The input end of the AC/DC conversion unit is connected to the first power distribution unit, the output end is connected to the input end of the DC power distribution unit, and the output end of the DC power distribution unit is connected to the DC input side of the dual power supply load ;

The output end of the AC/DC conversion unit is also connected to the DC/AC conversion device;

The battery pack is arranged between the AC/DC conversion unit and the DC power distribution unit.

Preferably, the AC power supply device includes a static switch, an inductor and an AC power distribution unit; the static switch is used to isolate the electrical fault of the input, and the inductor is used to stabilize the voltage of the second mains;

One end of the static switch is connected to the second power distribution unit, the other end of the static switch is connected to one end of the inductor, the other end of the inductor is connected to the input end of the AC power distribution unit, and the output end of the AC power distribution unit is connected to the dual power distribution unit. AC input side connection of power load;

The other end of the static switch is also connected with the DC/AC conversion device.

Preferably, the DC/AC conversion device includes a maintenance switch and a DC/AC conversion unit; the maintenance switch is a normally closed switch, which is disconnected when the DC/AC conversion unit needs maintenance;

One end of the maintenance switch is connected to the output end of the AC/DC conversion unit, the other end of the maintenance switch is connected to the input end of the DC/AC conversion unit, and the output end of the DC/AC conversion unit is connected to the other end of the static switch.

Preferably, the AC/DC conversion unit is a rectifier; the DC/AC conversion unit is an inverter.

Preferably, the bus tie switch is in an open state when both the first transformer and the second transformer have normal outputs; the bus tie switch is closed when the first transformer or the second transformer has no output.

Preferably, the static switch is in a closed state when the output of the second power distribution unit is normal; the static switch is turned off when the second power distribution unit has no output.

Preferably, the inverter is in an open state when the static switch is closed; the inverter is started when the static switch is opened.

Preferably, the battery pack is in a charged state when the output of the rectifier is normal; the battery pack is converted into a discharged state when the rectifier has no output, and outputs direct current to the input end of the direct current power distribution unit and the maintenance one end of the switch.

Compared with the prior art, the beneficial effects of the technical solution of the present invention are:

The present invention provides an AC-DC hybrid uninterruptible power supply system, which includes a mains power supply device, a DC power supply device, an AC power supply device and a DC/AC conversion device. When the mains power supply device outputs the first mains power and the second mains power are normal, the DC power supply device converts the first mains power into DC power and transmits it to the dual power supply load, while the AC power supply device transmits the second mains power to the dual power supply load; when any line of mains output from the mains power supply device fails, the other line of mains that is not faulty will be sent to the DC power supply device and the AC power supply device at the same time, and then sent to the DC power supply device and the AC power supply device. Dual power supply load; when both the first mains and the second mains output by the mains power supply device are faulty, the DC power supply device transmits the stored DC power to the dual power supply load and the DC/AC conversion device at the same time. The conversion device converts the received direct current into alternating current and transmits it to the alternating current power supply device, and then transmits it to the dual power supply load through the alternating current power supply device. The invention can realize uninterrupted power supply to both AC and DC of dual power supply loads.

Description of drawings

1 is a schematic structural diagram of an AC-DC hybrid uninterruptible power supply system according to Embodiment 1;

2 is a schematic structural diagram of an AC-DC hybrid uninterruptible power supply system according to Embodiment 2;

In the figure: 1-mains power supply device, 2-DC power supply device, 3-AC power supply device, 4-DC/AC conversion device, 10-first transformer, 11-first power distribution unit, 12-busbar tie switch, 13-Second Transformer, 14-Second Power Distribution Unit, 20-AC/DC Conversion Unit, 21-Battery Pack, 22-DC Power Distribution Unit, 30-Static Switch, 31-Inductor, 32-AC Power Distribution Unit , 40-maintenance switch, 41-direct/ac conversion unit.

Detailed ways

The accompanying drawings are for illustrative purposes only, and should not be construed as limitations on this patent;

In order to better illustrate this embodiment, some parts of the drawings are omitted, enlarged or reduced, which do not represent the size of the actual product;

It will be understood by those skilled in the art that some well-known structures and their descriptions may be omitted from the drawings.

The technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments.

Example 1

This embodiment provides an AC-DC hybrid uninterruptible power supply system. As shown in FIG. 1 , the system includes a mains power supply device 1 , a DC power supply device 2 , an AC power supply device 3 and a DC/AC conversion device 4 ;

The mains power supply device 1 outputs the first mains power and the second mains, and the first mains and the second mains are mutually backup;

The DC power supply device 2 is connected to the mains power supply device 1, and is used to convert the first mains power output by the mains power supply device 1 into DC power, and to deliver the converted DC power to the dual power supply load for power supply. Dual power load for power supply;

The AC power supply device 3 is connected to the mains power supply device 1, and is used to transmit the second mains power output from the mains power supply device 1 to the dual power supply load to supply power to the dual power supply load;

The DC/AC conversion device 4 is connected to the DC power supply device 2, and is used to convert the DC power converted by the DC power supply device 2 into AC power, and transmit the converted AC power to the AC power supply device 3;

If the mains power supply device 1 outputs the first mains power and the second mains power are normal, the DC power supply device 2 converts the first mains power into DC power and transmits it to the dual power supply load; at the same time, the AC power supply The device 3 transmits the second mains power to the dual power supply load;

If any one of the mains output by the mains power supply device 1 fails, another line of mains that is not faulty will be delivered to the DC power supply device 2 and the AC power supply device 3 at the same time, through the DC power supply device 2 and the AC power supply device 3. Delivered to dual power loads;

If both the first mains and the second mains output by the mains power supply device 1 are faulty, the DC power supply device 2 transmits the stored DC power to the dual power supply load and the DC/AC conversion device 4 at the same time, The DC/AC conversion device 4 converts the received DC power into AC power and transmits it to the AC power supply device 3 , and then transmits it to the dual power supply load through the AC power supply device 3 .

This embodiment can implement uninterrupted power supply for both AC and DC of the dual power supply load.

Example 2

This embodiment provides an AC-DC hybrid uninterruptible power supply system. As shown in FIG. 2 , the system includes a mains power supply device 1 , a DC power supply device 2 , an AC power supply device 3 and a DC/AC conversion device 4 ;

The mains power supply device 1 outputs the first mains power and the second mains, and the first mains and the second mains are mutually backup;

The DC power supply device 2 is connected to the mains power supply device 1, and is used to convert the first mains power output by the mains power supply device 1 into DC power, and to deliver the converted DC power to the dual power supply load for power supply. Dual power load for power supply;

The AC power supply device 3 is connected to the mains power supply device 1, and is used to transmit the second mains power output from the mains power supply device 1 to the dual power supply load to supply power to the dual power supply load;

The DC/AC conversion device 4 is connected to the DC power supply device 2 , and is used to convert the DC power converted by the DC power supply device 2 into AC power again, and transmit the converted AC power to the AC power supply device 3 .

The mains power supply device 1 includes a first transformer 10 , a first power distribution unit 11 , a bus tie switch 12 , a second transformer 13 and a second power distribution unit 14 ;

The output end of the first transformer 10 is connected to the DC power supply device 2 through the first power distribution unit 11;

The output end of the second transformer 13 is connected to the AC power supply device 3 through the second power distribution unit 14;

The busbar tie switch 12 is connected to the output end of the first transformer 10 and the output end of the second transformer 12, and the function is to make the first line of mains and the second line of mains backup mutually.

The DC power supply device 2 includes an AC/DC conversion unit 20, a battery pack 21 and a DC power distribution unit 22;

The input end of the AC/DC conversion unit 20 is connected to the first power distribution unit 11 , the output end of the AC/DC conversion unit 20 is connected to the input end of the DC power distribution unit 22 , and the output end of the DC power distribution unit 22 is connected. The output terminal is connected to the DC input side of the dual power supply load;

The output end of the AC/DC conversion unit 20 is also connected to the DC/AC conversion device 4;

The battery pack 21 is disposed between the AC/DC conversion unit 20 and the DC power distribution unit 22 .

The AC power supply device 3 includes a static switch 30, an inductor 31 and an AC power distribution unit 32;

One end of the static switch 30 is connected to the second power distribution unit 14, the other end of the static switch 30 is connected to one end of the inductor 31, the other end of the inductor 31 is connected to the input end of the AC power distribution unit 32, and the AC power distribution The output end of the unit 32 is connected to the AC input side of the dual power supply load;

The other end of the static switch 30 is also connected to the DC/AC conversion device 4 .

The DC/AC conversion device 4 includes a maintenance switch 40 and a DC/AC conversion unit 41; the maintenance switch 40 is a normally closed switch, which is disconnected when the DC/AC conversion unit 41 needs maintenance;

One end of the maintenance switch 40 is connected to the output end of the AC/DC conversion unit 20 , the other end of the maintenance switch 40 is connected to the input end of the DC/AC conversion unit 41 , and the output end of the DC/AC conversion unit 41 is connected to the static switch 30 the other end of the connection.

The AC/DC conversion unit 20 is a rectifier; the DC/AC conversion unit 41 is an inverter.

The bus tie switch 12 is in an open state when both the first transformer 10 and the second transformer 13 output normally; the bus tie switch 12 is closed when the first transformer 10 or the second transformer 13 has no output.

The static switch 30 is in a closed state when the output of the second power distribution unit 14 is normal; the static switch 30 is turned off when the second power distribution unit 14 has no output.

The inverter is in an open state when the static switch 30 is closed; the inverter is started when the static switch 30 is opened.

The battery pack 21 is in a charging state when the output of the rectifier is normal; the battery pack 21 is converted into a discharging state when the rectifier has no output, and outputs DC power to the input end of the DC power distribution unit 22 and the maintenance one end of the switch 40 .

In practical work:

In the normal mode, the bus tie switch 12 is in the open state, the static switch 30 is in the closed state, the maintenance switch 40 is in the closed state, the battery pack 21 is in the charging state, and the inverter is in the disconnected state; Transformer 10, first power distribution unit 11, rectifier, and DC power distribution unit 22 to the DC input side of the dual power supply load; the second mains power goes through the second transformer 13, the second power distribution unit 14, the static switch 30, and the inductor 31. The AC power distribution unit 32 is connected to the AC input side of the dual power supply load.

The failure mode includes the following situations: (1) any mains output failure; (2) the second power distribution unit 14 has no output, but the rectifier has output; (3) the rectifier has no output, and the second power distribution unit 14 has output; (4) ) rectifier and the second power distribution unit 14 have no output.

In case (1), the bus tie switch 12 is closed, the static switch 30 is closed, the maintenance switch 40 is closed, the battery pack 21 is in a charging state, and the inverter is in an open state. Taking the first mains failure as an example, the second mains goes through the second transformer 13, the bus tie switch 12, the first power distribution unit 11, the rectifier, and the DC power distribution unit 22 to the DC input side of the dual power supply load; The second mains power goes through the second transformer 13 , the second power distribution unit 14 , the static switch 30 , the inductor 31 , and the AC power distribution unit 32 to the AC input side of the dual power load.

In case (2), the static switch 30 is turned off, the maintenance switch 40 is turned on, the battery pack 21 is in a charging state, and the inverter is started. The first mains power goes through the first transformer 10 or the second mains via the second transformer 13, the first power distribution unit 11, the rectifier, and the DC power distribution unit 22 to the DC input side of the dual power supply load; The AC power from the first transformer 10 or the second mains power to the dual power load via the second transformer 13, the first power distribution unit 11, the rectifier, the maintenance switch 40, the inverter, the inductor 31, and the AC power distribution unit 32 input side.

In case (3), the static switch 30 is in a closed state, the maintenance switch 40 is in a closed state, the battery pack 21 is in a discharging state, and the inverter is in an open state. The DC power discharged by the battery pack 21 passes through the DC power distribution unit 22 to the DC input side of the dual power supply load; at the same time, the second mains power passes through the second transformer 13, the second power distribution unit 14, the static switch 30, the inductor 31, and the AC power distribution unit. Electric unit 32 to the AC input side of the dual power load.

In case (4), the static switch 30 is turned off, the maintenance switch 40 is turned on, the battery pack 21 is discharged, and the inverter is started. The DC power discharged from the battery pack 21 passes through the DC power distribution unit 22 to the DC input side of the dual power supply load; at the same time, the DC power discharged from the battery pack 21 passes through the maintenance switch 40, the inverter, the inductor 31, and the AC power distribution unit 32 to the dual power supply load. the AC input side.

The AC-DC hybrid uninterruptible power supply system provided in this embodiment can implement uninterrupted power supply for both AC and DC of dual power supply loads under various fault conditions.

The same or similar reference numbers correspond to the same or similar parts;

The terms describing the positional relationship in the accompanying drawings are only used for exemplary illustration, and should not be construed as a limitation on this patent;

Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limiting the embodiments of the present invention. For those of ordinary skill in the art, changes or modifications in other different forms can also be made on the basis of the above description. There is no need and cannot be exhaustive of all implementations here. Any modifications, equivalent replacements and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims (10)

1. an AC-DC hybrid uninterruptible power supply system, characterized in that the system comprises a mains power supply device (1), a DC power supply device (2), an AC power supply device (3) and a DC/AC conversion device (4) ); The mains power supply device (1) outputs the first mains power and the second mains, and the first mains and the second mains are mutually backup; The DC power supply device (2) is connected to the mains power supply device (1), converts the first mains power output by the mains power supply device (1) into DC power, and stores the DC power while converting the DC power is delivered to the dual power supply load to supply power to the dual power supply load; The AC power supply device (3) is connected to the mains power supply device (1), and the second mains power output from the mains power supply device (1) is delivered to the dual power supply load to supply power to the dual power supply load; The DC/AC conversion device (4) is connected to the DC power supply device (2), converts the DC power converted by the DC power supply device (2) into AC power, and transmits the converted AC power to the AC power supply device (3). 2. An AC-DC hybrid uninterruptible power supply system according to claim 1, wherein the mains power supply device (1) comprises a first transformer (10), a first power distribution unit (11), a busbar tie switch (12), a second transformer (13) and a second power distribution unit (14); The output end of the first transformer (10) is connected to the DC power supply device (2) through a first power distribution unit (11); The output end of the second transformer (13) is connected to the AC power supply device (3) through a second power distribution unit (14); The busbar tie switch (12) connects the output end of the first transformer (10) and the output end of the second transformer (12), and is used for mutual backup of the first line of commercial power and the second line of commercial power. 3. An AC-DC hybrid uninterruptible power supply system according to claim 2, characterized in that, the DC power supply device (2) comprises an AC/DC conversion unit (20), a battery pack (21) and a DC distribution unit electric unit (22); The input end of the AC/DC conversion unit (20) is connected to the first power distribution unit (11), and the output end of the AC/DC conversion unit (20) is connected to the input end of the DC power distribution unit (22) connection, the output end of the DC power distribution unit (22) is connected with the DC input side of the dual power supply load; The output end of the AC/DC conversion unit (20) is also connected to the DC/AC conversion device (4); The battery pack (21) is arranged between the AC/DC conversion unit (20) and the DC power distribution unit (22). 4. An AC-DC hybrid uninterruptible power supply system according to claim 3, wherein the AC power supply device (3) comprises a static switch (30), an inductor (31) and an AC power distribution unit ( 32); One end of the static switch (30) is connected to the second power distribution unit (14), the other end of the static switch (30) is connected to one end of the inductor (31), and the other end of the inductor (31) is connected to AC power distribution The input end of the unit (32) is connected, and the output end of the AC power distribution unit (32) is connected with the AC input side of the dual power supply load; The other end of the static switch (30) is also connected to the DC/AC conversion device (4). 5. An AC/DC hybrid uninterruptible power supply system according to claim 4, wherein the DC/AC conversion device (4) comprises a maintenance switch (40) and a DC/AC conversion unit (41); One end of the maintenance switch (40) is connected to the output end of the AC/DC conversion unit (20), and the other end of the maintenance switch (40) is connected to the input end of the DC/AC conversion unit (41). The output terminal of (41) is connected to the other terminal of the static switch (30). 6. An AC/DC hybrid uninterruptible power supply system according to claim 5, wherein the AC/DC conversion unit (20) is a rectifier; the DC/AC conversion unit (41) is an inverter device. 7. The AC-DC hybrid uninterruptible power supply system according to claim 6, wherein the bus tie switch (12) is normal when the output of the first transformer (10) and the second transformer (13) is normal is in an open state; the bus tie switch (12) is closed when the first transformer (10) or the second transformer (13) has no output. 8 . The AC-DC hybrid uninterruptible power supply system according to claim 7 , wherein the static switch ( 30 ) is in a closed state when the output of the second power distribution unit ( 14 ) is normal; The static switch (30) is turned off when the second power distribution unit (14) has no output. 9. The AC-DC hybrid uninterruptible power supply system according to claim 8, wherein the inverter is in an off state when the static switch (30) is closed; The static switch (30) is activated when it is opened. 10. The AC-DC hybrid uninterruptible power supply system according to claim 9, wherein the battery pack (21) is in a charging state when the output of the rectifier is normal; When the rectifier has no output, it is converted into a discharge state, and outputs direct current to the input end of the direct current power distribution unit (22) and one end of the maintenance switch (40).

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