CN114825576A - Efficient alternating current-direct current hybrid uninterruptible power supply system - Google Patents
Efficient alternating current-direct current hybrid uninterruptible power supply system Download PDFInfo
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- CN114825576A CN114825576A CN202110087204.3A CN202110087204A CN114825576A CN 114825576 A CN114825576 A CN 114825576A CN 202110087204 A CN202110087204 A CN 202110087204A CN 114825576 A CN114825576 A CN 114825576A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
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Abstract
The invention provides a high-efficiency alternating current-direct current hybrid uninterruptible power supply system, which comprises a mains supply device, a direct current power supply device, an alternating current power supply device, a direct current/alternating current conversion device, a direct current static switch and an alternating current static switch, wherein the alternating current static switch is connected with the mains supply device; the commercial power supply device outputs a first commercial power and a second commercial power which are mutually prepared; the first path of commercial power is transmitted to a dual-power load through a commercial power supply device, a direct-current power supply device and a direct-current static switch; the second path of commercial power is transmitted to a dual-power load through a commercial power supply device, an alternating current static switch and an alternating current power supply device; the direct current/alternating current conversion device is connected with the direct current power supply device, and converts direct current converted by the direct current power supply device into alternating current and transmits the alternating current to the alternating current power supply device; the alternating current static switch is in a closed state when commercial power is input, and the direct current static switch is in an open state; the alternating current static switch is disconnected when no commercial power is input, and the direct current static switch is closed. The invention can ensure uninterrupted power supply to the dual-power load and improve the power supply efficiency.
Description
Technical Field
The invention relates to the technical field of power supply systems, in particular to a high-efficiency alternating current-direct current hybrid uninterruptible power supply system.
Background
The data center is an infrastructure supporting critical digital services, and therefore, for a power supply system of the data center, high reliability and low cost of the power supply system are ensured at the same time. At present, the IT equipment generally adopts double power supply input. In order to ensure high reliability of operation of a power supply system of a data center, one method is to configure two Uninterrupted Power Supplies (UPS) for commercial power to realize uninterrupted power supply to a dual-power load, and when one UPS stops supplying power, the other UPS independently utilizes the commercial power to supply power to IT equipment. Therefore, the working power of each UPS needs to be not less than the load power of the IT equipment, when the two UPSs work normally and supply power at the same time, the working power of each UPS is equal, the UPS works under half load, the power supply efficiency is low, and the operation cost is high; the other method is to adopt a power supply system with one path of commercial power direct supply and one path of high-voltage direct-current power supply to supply power to a dual-power load, the working power of the same commercial power direct supply branch and the working power of the same high-voltage direct-current power supply branch are both under half load, and the power supply system cannot guarantee uninterrupted power supply and cannot meet the requirement of high reliability.
Chinese patent CN210183090U published in 7, 17.2019 provides an uninterruptible power supply circuit and an uninterruptible power supply apparatus, where the uninterruptible power supply circuit for continuously and uninterruptedly supplying power to a load includes: a main power supply circuit outputting a power supply voltage; the output circuit is used for receiving the power supply voltage output by the main power supply circuit to supply power to a load; a power supply module; a switch control circuit; the power supply module is connected with the output circuit through the switch, and the controlled end of the switch is connected with the control end of the switch control circuit; the switch control circuit is further used for controlling the power supply module to supply power to the output circuit when the output voltage of the power supply module is greater than the output voltage of the output circuit; and when the output voltage of the power supply module is less than the output voltage of the output circuit, controlling the power supply module to stop supplying power. This patent can realize the uninterrupted power supply to load single type electric current, can't realize handing over to dual supply load, direct current is the uninterrupted power supply, and the reliability is not high to the power supply efficiency is low.
Disclosure of Invention
The invention provides a high-efficiency alternating current-direct current hybrid uninterruptible power supply system for overcoming the defect of low power supply efficiency when the prior art supplies power to a dual-power load uninterruptedly.
The technical scheme of the invention is as follows:
the invention provides a high-efficiency alternating current-direct current hybrid uninterruptible power supply system, which comprises a mains supply device, a direct current power supply device, an alternating current power supply device, a direct current/alternating current conversion device, a direct current static switch and an alternating current static switch, wherein the alternating current power supply device is connected with the alternating current static switch;
the commercial power supply device outputs a first path of commercial power and a second path of commercial power, and the first path of commercial power and the second path of commercial power are mutually standby;
the direct current power supply device is connected with the commercial power supply device and used for converting a first path of commercial power output by the commercial power supply device into direct current, storing the direct current, simultaneously transmitting the direct current to the direct current static switch, and supplying power to a dual-power load through the direct current static switch;
one end of the alternating current static switch is connected with a mains supply device, and the other end of the alternating current static switch is connected with the alternating current power supply device; the second path of commercial power is transmitted to the dual-power load through the commercial power supply device, the alternating current static switch and the alternating current power supply device to supply power to the dual-power load;
the direct current/alternating current conversion device is connected with the direct current power supply device and is used for converting direct current converted by the direct current power supply device into alternating current and transmitting the alternating current obtained by conversion to the alternating current power supply device;
the alternating current static switch is in a closed state when commercial power is input, and the direct current static switch is in an open state; the alternating current static switch is disconnected when no commercial power is input, and the direct current static switch is closed.
When commercial power is input into the alternating current static switch, the alternating current static switch is in a closed state, and the input commercial power is transmitted to a dual-power load through an alternating current power supply device; the direct current static switch is in a disconnected state, and the direct current power supply device converts the input commercial power into direct current and stores the direct current; at the moment, the alternating current power supply device bears the power supply task of 100% of the dual-power load.
When the alternating current static switch has no commercial power input, the alternating current static switch is switched off, and the direct current static switch is switched on, wherein the conditions comprise that: (1) the direct current power supply device is provided with a commercial power input; (2) the direct current power supply device has no commercial power input; in the case (1), the input commercial power is converted into direct current by the direct current power supply device and then is transmitted to the dual-power load from the direct current static switch; meanwhile, the input commercial power is converted into direct current by the direct current power supply device and then is transmitted to the direct current/alternating current conversion device, the direct current/alternating current conversion device converts the received direct current into alternating current which is transmitted to the alternating current power supply device, and the alternating current power supply device transmits the alternating current to the dual-power load. At the moment, the direct current power supply device and the alternating current power supply device respectively bear 50% of power supply tasks of the double power supply loads; in the case (2), the DC power supply device releases the stored DC power and transmits the DC power to a dual-power load through a DC static switch; and meanwhile, the direct current released and stored by the direct current power supply device is converted into alternating current by the direct current/alternating current conversion device and is transmitted to the alternating current power supply device, and the alternating current power supply device transmits the alternating current power to the dual-power-supply load. At the moment, the direct current power supply device and the alternating current power supply device respectively bear 50% of the power supply task of the double power supply load.
Preferably, the commercial power supply device comprises 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 with the direct current power supply device through a first power distribution unit;
the output end of the second transformer is connected with the alternating current static switch through a second power distribution unit;
the bus bar interconnection switch is connected with the output end of the first transformer and the output end of the second transformer and is used for enabling the first path of commercial power and the second path of commercial power to be mutually standby.
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 with the first power distribution unit, the output end of the AC/DC conversion unit is connected with the input end of the DC power distribution unit, and the output end of the DC power distribution unit is connected with the DC static switch;
the output end of the AC/DC conversion unit is also connected with the DC/AC conversion device;
the battery pack is arranged between the AC/DC conversion unit and the DC distribution unit.
Preferably, the ac power supply device includes an inductor and an ac power distribution unit;
one end of the inductor is connected with the other end of the alternating current static switch, the other end of the inductor is connected with the input end of the alternating current power distribution unit, and the output end of the alternating current power distribution unit is connected with the alternating current input side of the dual-power-supply load;
one end of the inductor is also connected with the direct/alternating current 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 and is disconnected when the direct current/alternating current conversion unit needs maintenance;
one end of the maintenance switch is connected with the output end of the AC/DC conversion unit, the other end of the maintenance switch is connected with the input end of the DC/AC conversion unit, and the output end of the DC/AC conversion unit is connected with one end of the inductor.
Preferably, the ac/dc conversion unit is a rectifier.
Preferably, the dc/ac conversion unit is an inverter.
Preferably, the bus tie switch is in an off state when the first transformer and the second transformer both normally output; the bus tie switch is closed when the first transformer or the second transformer has no output.
Preferably, the inverter is in an open state when the ac static switch is closed; the inverter is started when the AC static switch is turned off.
Preferably, the battery pack is in a charged state when the rectifier output is normal; and the battery pack is converted into a discharge state when the rectifier does not output, and outputs direct current to the input end of the direct current power distribution unit and one end of the maintenance switch.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
the invention provides an efficient alternating current-direct current hybrid uninterruptible power supply system which comprises a mains supply device, a direct current power supply device, an alternating current power supply device, a direct current/alternating current conversion device, a direct current static switch and an alternating current static switch. When commercial power is input into the alternating current static switch, the alternating current static switch is in a closed state, and the input commercial power is transmitted to a dual-power load through an alternating current power supply device; the direct current static switch is in a disconnected state, and the direct current power supply device converts the input commercial power into direct current and stores the direct current; at the moment, the alternating current power supply device bears 100% of power supply tasks of the dual-power load, and the working power of the alternating current power supply device is equal to the power of the dual-power load. When the alternating current static switch has no commercial power input, the alternating current static switch is switched off, and the direct current static switch is switched on, wherein the conditions comprise that: (1) the direct current power supply device is provided with a commercial power input; (2) the DC power supply device has no commercial power input. In the case (1), the input commercial power is converted into direct current by the direct current power supply device and then is transmitted to the dual-power load from the direct current static switch; meanwhile, the input commercial power is converted into direct current by the direct current power supply device and then is transmitted to the direct current/alternating current conversion device, the direct current/alternating current conversion device converts the received direct current into alternating current which is transmitted to the alternating current power supply device, and the alternating current power supply device transmits the alternating current to the dual-power load. At the moment, the direct current power supply device and the alternating current power supply device respectively bear 50% of power supply tasks of the dual-power load, and the working power of the direct current power supply device and the working power of the alternating current power supply device are half of the power of the dual-power load. In the case (2), the DC power supply device releases the stored DC power and transmits the DC power to a dual-power load through a DC static switch; and meanwhile, the direct current released and stored by the direct current power supply device is converted into alternating current by the direct current/alternating current conversion device and is transmitted to the alternating current power supply device, and the alternating current power supply device transmits the alternating current power to the dual-power-supply load. At the moment, the direct current power supply device and the alternating current power supply device respectively bear 50% of power supply tasks of the dual-power load, and the working power of the direct current power supply device and the working power of the alternating current power supply device are half of the power of the dual-power load.
The invention can ensure uninterrupted power supply to the dual-power load, and simultaneously, the working power of the direct current power supply device and the alternating current power supply device is enabled to run at half of the power of the dual-power load; when the commercial power is normal, the alternating current commercial power is preferably selected for direct supply, so that the working power of the alternating current power supply device is equal to the power of the dual-power-supply load, and the power supply efficiency is improved.
Drawings
Fig. 1 is a schematic structural diagram of an efficient ac/dc hybrid uninterruptible power supply system according to embodiment 1;
fig. 2 is a schematic structural diagram of an efficient ac/dc hybrid uninterruptible power supply system according to embodiment 2;
in the figure: the power supply system comprises a power supply device 1, a power supply device 2, a power supply device 3, a power supply device 4, a direct current/alternating current conversion device 5, a direct current static switch 6, an alternating current static switch 10, a first transformer 11, a first power distribution unit 12, a bus bar interconnection switch 13, a second transformer 14, a second power distribution unit 20, an alternating current/direct current conversion unit 21, a battery pack 22, a direct current power distribution unit 31, an inductor 32, an alternating current power distribution unit 40, a maintenance switch 41 and a direct current/alternating current conversion unit.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent;
for the purpose of better illustrating the present embodiments, certain elements of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product;
it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
Example 1
The embodiment provides a high-efficiency ac/dc hybrid uninterruptible power supply system, as shown in fig. 1, the system includes a utility power supply device 1, a dc power supply device 2, an ac power supply device 3, a dc/ac conversion device 4, a dc static switch 5, and an ac static switch 6;
the commercial power supply device 1 outputs a first commercial power and a second commercial power, and the first commercial power and the second commercial power are mutually standby;
the direct current power supply device 2 is connected with the commercial power supply device 1 and is used for converting a first path of commercial power output by the commercial power supply device 1 into direct current, storing the direct current, meanwhile, transmitting the direct current to the direct current static switch 5, and supplying power to a dual-power load through the direct current static switch 5;
one end of the alternating current static switch 6 is connected with the commercial power supply device 1, and the other end of the alternating current static switch 6 is connected with the alternating current power supply device 3; a second path of commercial power is transmitted to a dual-power load through the commercial power supply device 1, the alternating current static switch 6 and the alternating current power supply device 3 to supply power to the dual-power load;
the dc/ac conversion device 4 is connected to the dc power supply device 2, and is configured to convert the dc power converted by the dc power supply device 2 into ac power, and transmit the ac power obtained by conversion to the ac power supply device 3;
the alternating current static switch 6 is in a closed state when commercial power is input, and the direct current static switch 5 is in an open state; the AC static switch 6 is disconnected when no commercial power is input, and the DC static switch 5 is closed.
In actual operation:
when commercial power is input into the alternating current static switch 6, the alternating current static switch 6 is in a closed state, and the input commercial power is transmitted to a dual-power load through the alternating current power supply device 3; the direct current static switch 5 is in a disconnected state, and the direct current power supply device 2 converts the input commercial power into direct current and stores the direct current; at this time, the ac power supply device 3 assumes 100% of the power supply task of the dual power source load, and the working power of the ac power supply device 3 is equal to the power of the dual power source load.
When the alternating current static switch 6 has no commercial power input, the alternating current static switch 6 is switched off, and the direct current static switch 5 is switched on, including the following conditions: (1) the direct current power supply device 2 has commercial power input; (2) the direct current supply device 2 has no commercial power input;
in the case (1), the input commercial power is converted into direct current by the direct current supply device 2 and then is transmitted to the dual-power load from the direct current static switch 5; meanwhile, the input commercial power is converted into direct current by the direct current power supply device 2 and then is transmitted to the direct current/alternating current conversion device 4, the direct current/alternating current conversion device 4 converts the received direct current into alternating current and transmits the alternating current to the alternating current power supply device 3, and the alternating current is transmitted to a dual-power load by the alternating current power supply device 3. At the moment, the direct current power supply device 2 and the alternating current power supply device 3 respectively bear 50% of power supply tasks of a dual-power load, and the working power of the direct current power supply device 2 and the working power of the alternating current power supply device 3 are half of the power of the dual-power load;
in the case (2), the dc power supply device 2 releases the stored dc power and delivers the dc power to the dual-power load through the dc static switch 5; meanwhile, the direct current released and stored by the direct current power supply device 2 is converted into alternating current by the direct current/alternating current conversion device 4 and is transmitted to the alternating current power supply device 3, and the alternating current power supply device 3 transmits the alternating current power to a dual-power load. At this time, the direct current power supply device 2 and the alternating current power supply device 3 respectively undertake the power supply task of 50% of the dual-power load, and the working power of the direct current power supply device 2 and the working power of the alternating current power supply device 3 are half of the power of the dual-power load.
Example 2
The embodiment provides a high-efficiency ac/dc hybrid uninterruptible power supply system, as shown in fig. 2, the system includes a utility power supply device 1, a dc power supply device 2, an ac power supply device 3, a dc/ac conversion device 4, a dc static switch 5, and an ac static switch 6;
the commercial power supply device 1 outputs a first commercial power and a second commercial power, and the first commercial power and the second commercial power are mutually standby;
the direct current power supply device 2 is connected with the commercial power supply device 1 and is used for converting a first path of commercial power output by the commercial power supply device 1 into direct current, storing the direct current, meanwhile, transmitting the direct current to the direct current static switch 5, and supplying power to a dual-power load through the direct current static switch 5;
one end of the alternating current static switch 6 is connected with the commercial power supply device 1, and the other end of the alternating current static switch 6 is connected with the alternating current power supply device 3; a second path of commercial power is transmitted to a dual-power load through a commercial power supply device 1, an alternating current static switch 6 and an alternating current power supply device 3 to supply power to the dual-power load;
the dc/ac conversion device 4 is connected to the dc power supply device 2, and is configured to convert the dc power converted by the dc power supply device 2 into ac power, and transmit the ac power obtained by conversion to the ac power supply device 3;
the alternating current static switch 6 is in a closed state when commercial power is input, and the direct current static switch 5 is in an open state; the AC static switch 6 is disconnected when no commercial power is input, and the DC static switch 5 is closed.
The commercial power supply device 1 comprises 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 with the dc power supply device 2 through a first power distribution unit 11;
the output end of the second transformer 13 is connected with the alternating current static switch 6 through a second power distribution unit 14;
the bus bar interconnection switch 12 is connected with the output end of the first transformer 10 and the output end of the second transformer 12, and is used for enabling the first path of commercial power and the second path of commercial power to be mutually standby.
The direct current power supply device 2 comprises an alternating current/direct current conversion unit 20, a battery pack 21 and a direct current 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 to the dc static switch 5;
the output end of the ac/dc conversion unit 20 is further connected to the dc/ac conversion device 4;
the battery pack 21 is disposed between the ac/dc conversion unit 20 and the dc distribution unit 22.
The ac power supply device 3 includes an inductor 31 and an ac power distribution unit 32;
one end of the inductor 31 is connected with the other end of the alternating current static switch 6, the other end of the inductor 31 is connected with the input end of the alternating current distribution unit 32, and the output end of the alternating current distribution unit 32 is connected with the alternating current input side of the dual-power load;
one end of the inductor 31 is also connected to the dc/ac converting means 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, and is turned off 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 one end of the inductor 31.
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 a disconnected state when the first transformer 10 and the second transformer 13 both normally output; the bustie switch 12 is closed when there is no output from the first transformer 10 or the second transformer 13.
The inverter is in an open state when the ac static switch 6 is closed; the inverter is started when the ac static switch 6 is turned off.
The battery pack 21 is in a charged state when the rectifier output is normal; the battery pack 21 is switched to a discharge state when the rectifier has no output, and outputs a direct current to an input terminal of the direct current distribution unit 22 and one terminal of the maintenance switch 40.
In actual operation:
in the normal mode, the bus bar connection switch 12 is in an open state, the alternating current static switch 6 is in a closed state, the direct current static switch 5 is in an open state, the maintenance switch 40 is in a closed state, the battery pack 21 is in a charging state, and the inverter is in an open state; a first path of commercial power is charged to a battery pack 21 through a first transformer 10, a first power distribution unit 11 and a rectifier; the second path of commercial power passes through the second transformer 13, the second power distribution unit 14, the alternating current static switch 6, the inductor 31 and the alternating current power distribution unit 32 to the alternating current input side of the dual-power load.
Failure modes include the following: (1) any one-path mains supply output fault; (2) the second power distribution unit 14 has no output and the rectifier has an output; (3) neither the rectifier nor the second power distribution unit 14 has an output.
In case (1), the bus bar tie switch 12 is closed, the ac static switch 6 is closed, the dc static switch 5 is open, the maintenance switch 40 is closed, the battery pack 21 is charged, and the inverter is open. Taking the first path of commercial power as an example, the second path of commercial power is charged to the battery pack 21 through the second transformer 13, the bus bar interconnection switch 12, the first power distribution unit 11 and the rectifier; meanwhile, the second path of commercial power passes through the second transformer 13, the second power distribution unit 14, the alternating current static switch 6, the inductor 31 and the alternating current power distribution unit 32 to the alternating current input side of the dual-power load.
In the case (2), the ac static switch 6 is opened, the dc static switch 5 is closed, the maintenance switch 40 is closed, the battery pack 21 is charged, and the inverter is started. A first path of commercial power passes through a first transformer 10 or a second path of commercial power passes through a second transformer 13, a first power distribution unit 11, a rectifier, a direct current power distribution unit 22 and a direct current static switch 5 to a direct current input side of a dual-power load; meanwhile, the first path of commercial power passes through the first transformer 10 or the second path of commercial power passes through the second transformer 13, the first distribution unit 11, the rectifier, the maintenance switch 40, the inverter, the inductor 31 and the alternating current distribution unit 32 to reach the alternating current input side of the dual-power load.
In the case (3), the ac static switch 6 is opened, the dc static switch 5 is closed, the maintenance switch 40 is closed, the battery pack 21 is discharged, and the inverter is started. The direct current discharged by the battery pack 21 passes through the direct current distribution unit 22 and the direct current static switch 5 to the direct current input side of the dual-power load; meanwhile, the direct current discharged from the battery pack 21 passes through the maintenance switch 40, the inverter, the inductor 31, and the alternating current distribution unit 32 to the alternating current input side of the dual power load.
The efficient alternating current-direct current hybrid uninterruptible power supply system provided by the embodiment can ensure that the working power of a direct current power supply device and the working power of an alternating current power supply device both run at half of the power of a dual-power-supply load while the dual-power-supply load is uninterruptedly supplied with power; when the commercial power is normal, the alternating current commercial power is preferably selected for direct supply, so that the working power of the alternating current power supply device is equal to the power of the dual-power-supply load, and the power supply efficiency is improved. Meanwhile, after the alternating current static switch 6 is disconnected, the electrical fault of the second power distribution unit 14 can be isolated, the alternating current generated by the inverter is prevented from flowing backwards, and the alternating current static switch 6 plays a role in protecting the direct supply branch of the commercial power.
The same or similar reference numerals correspond to the same or similar parts;
the terms describing positional relationships in the drawings are for illustrative purposes only and are not to be construed as limiting the patent;
it should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A high-efficiency AC/DC hybrid uninterruptible power supply system is characterized by comprising a mains supply device (1), a DC power supply device (2), an AC power supply device (3), a DC/AC conversion device (4), a DC static switch (5) and an AC static switch (6);
the mains supply device (1) outputs a first path of mains supply and a second path of mains supply, and the first path of mains supply and the second path of mains supply are mutually standby;
the direct current power supply device (2) is connected with the commercial power supply device (1), converts a first path of commercial power output by the commercial power supply device (1) into direct current, stores the direct current, and simultaneously transmits the direct current to the direct current static switch (5), and the direct current passes through the direct current static switch (5) to a dual-power load so as to supply power to the dual-power load;
one end of the alternating current static switch (6) is connected with the commercial power supply device (1), and the other end of the alternating current static switch (6) is connected with the alternating current power supply device (3); a second path of commercial power output by the commercial power supply device (1) passes through the alternating current static switch (6) and the alternating current power supply device (3) to the dual-power load so as to supply power to the dual-power load;
the direct current/alternating current conversion device (4) is connected with the direct current power supply device (2), converts direct current converted by the direct current power supply device (2) into alternating current, and transmits the alternating current obtained by conversion to the alternating current power supply device (3);
the alternating current static switch (6) is in a closed state when commercial power is input, and the direct current static switch (5) is in an open state; the alternating current static switch (6) is disconnected when no commercial power is input, and the direct current static switch (5) is closed.
2. An efficient ac-dc hybrid uninterruptible power supply system according to claim 1, characterized in that the mains power supply device (1) comprises a first transformer (10), a first power distribution unit (11), a bussing switch (12), a second transformer (13) and a second power distribution unit (14);
the output end of the first transformer (10) is connected with the direct current power supply device (2) through a first power distribution unit (11);
the output end of the second transformer (13) is connected with the alternating current static switch (6) through a second power distribution unit (14);
the bus bar interconnection switch (12) is connected with the output end of the first transformer (10) and the output end of the second transformer (12) and is used for enabling the first path of commercial power and the second path of commercial power to be mutually standby.
3. An efficient 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 power distribution unit (22);
the input end of the alternating current/direct current conversion unit (20) is connected with the first power distribution unit (11), the output end of the alternating current/direct current conversion unit (20) is connected with the input end of the direct current distribution unit (22), and the output end of the direct current distribution unit (22) is connected with the direct current static switch (5);
the output end of the AC/DC conversion unit (20) is also connected with the DC/AC conversion device (4);
the battery pack (21) is disposed between the AC/DC conversion unit (20) and the DC distribution unit (22).
4. A high efficiency ac/dc hybrid uninterruptible power supply system according to claim 3, characterized in that the ac power supply unit (3) comprises an inductor (31) and an ac power distribution unit (32);
one end of the inductor (31) is connected with the other end of the alternating current static switch (6), the other end of the inductor (31) is connected with the input end of the alternating current distribution unit (32), and the output end of the alternating current distribution unit (32) is connected with the alternating current input side of the dual-power load;
one end of the inductor (31) is also connected with the direct/alternating current conversion device (4).
5. An efficient AC-DC hybrid uninterruptible power supply system according to claim 4, characterized in that 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 with the output end of the AC/DC conversion unit (20), the other end of the maintenance switch (40) is connected with the input end of the DC/AC conversion unit (41), and the output end of the DC/AC conversion unit (41) is connected with one end of the inductor (31).
6. An efficient AC-DC hybrid uninterruptible power supply system according to claim 5, wherein the AC/DC conversion unit (20) is a rectifier.
7. The system according to claim 5, wherein the DC/AC conversion unit (41) is an inverter.
8. An efficient AC/DC hybrid uninterruptible power supply system according to claim 7, characterized in that the bustie switch (12) is in an off state when the outputs of the first transformer (10) and the second transformer (13) are normal; the bus tie switch (12) is closed when the first transformer (10) or the second transformer (13) has no output.
9. An efficient ac-dc hybrid uninterruptible power supply system according to claim 8, wherein the inverter is in an open state when the ac static switch (6) is closed; the inverter is started when the AC static switch (6) is turned off.
10. An efficient ac-dc hybrid uninterruptible power supply system according to claim 9, wherein the battery pack (21) is in a charged state when the rectifier output is normal; the battery pack (21) is switched to a discharge state when the rectifier has no output, and outputs direct current to the input end of the direct current distribution unit (22) and one end of the maintenance switch (40).
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| CN202110087204.3A CN114825576A (en) | 2021-01-22 | 2021-01-22 | Efficient alternating current-direct current hybrid uninterruptible power supply system |
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| CN202110087204.3A CN114825576A (en) | 2021-01-22 | 2021-01-22 | Efficient alternating current-direct current hybrid uninterruptible power supply system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115864356A (en) * | 2023-02-17 | 2023-03-28 | 南方电网产业投资集团有限责任公司 | High-voltage direct-current power supply system |
| WO2024065075A1 (en) * | 2022-09-26 | 2024-04-04 | 航霈科技(深圳)有限公司 | Power supply apparatus, method and system |
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2021
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024065075A1 (en) * | 2022-09-26 | 2024-04-04 | 航霈科技(深圳)有限公司 | Power supply apparatus, method and system |
| CN115864356A (en) * | 2023-02-17 | 2023-03-28 | 南方电网产业投资集团有限责任公司 | High-voltage direct-current power supply system |
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