CN111600376A - Uninterruptible power supply device - Google Patents
Uninterruptible power supply device Download PDFInfo
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- CN111600376A CN111600376A CN202010515898.1A CN202010515898A CN111600376A CN 111600376 A CN111600376 A CN 111600376A CN 202010515898 A CN202010515898 A CN 202010515898A CN 111600376 A CN111600376 A CN 111600376A
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- control switch
- converter
- input source
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- energy storage
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Stand-By Power Supply Arrangements (AREA)
Abstract
The invention provides an uninterruptible power supply device, which comprises a first input end, a second input end, an output end, a first control switch, a second control switch, an AC/DC converter and an energy storage battery, wherein the first input end is connected with the first control switch; one end of the first control switch is connected with the first input end, and the other end of the first control switch is respectively connected with the output end and an AC port of the AC/DC converter; one end of the second control switch is connected with the second input end, and the other end of the second control switch is respectively connected with the output end and an AC port of the AC/DC converter; the DC port of the AC/DC converter is connected with the energy storage battery; the first input end is connected with a first input source, the second input end is connected with a second input source, and the output end is connected with a load.
Description
Technical Field
The invention relates to the field of electric power, in particular to an uninterruptible power supply device.
Background
An Uninterruptible Power Supply (UPS) is a system device that connects a battery to a host and converts dc Power to utility Power through a module circuit such as a host inverter, and is widely used in communication devices, a single computer, computer network systems, or other Power electronic devices such as electromagnetic valves and pressure transmitters, to provide stable and uninterrupted Power Supply for these devices. When the AC mains supply is input normally, the UPS charges a standby battery arranged inside; when the commercial power is interrupted (such as power failure), the UPS immediately supplies the direct current electric energy of the battery to the load by an inversion zero switching conversion method to continuously supply alternating current to the load, so that the load keeps normal work and protects the software and hardware of the load from being damaged.
The conventional uninterruptible power supply system mostly adopts a double conversion technology, that is, an input source is firstly converted from alternating current to direct current through an AC/DC circuit, then converted from direct current to alternating current through a DC/AC circuit, and converted from alternating current to direct current through the AC/DC circuit, and then transformed by the DC/DC circuit to charge a storage battery, as shown in fig. 1. Through two-stage conversion, the power supply efficiency of the system is low. The system circuit is complex, resulting in low power supply reliability. Meanwhile, the number of conversion circuits is large, and the system cost is high.
Disclosure of Invention
In view of the problems in the prior art, the present invention provides an uninterruptible power supply device, which includes a first input terminal, a second input terminal, an output terminal, a first control switch, a second control switch, an AC/DC converter, and an energy storage battery; one end of the first control switch is connected with the first input end, and the other end of the first control switch is respectively connected with the output end and an AC port of the AC/DC converter; one end of the second control switch is connected with the second input end, and the other end of the second control switch is respectively connected with the output end and an AC port of the AC/DC converter; the DC port of the AC/DC converter is connected with the energy storage battery; the first input end is connected with a first input source, the second input end is connected with a second input source, and the output end is connected with a load.
Further, the first input source or the second input source is selected to supply power to the load through the control of the first control switch and the second control switch.
Further, the state of the AC/DC converter is set according to a time period when the first input source or the second input source supplies power to the load.
Further, a first time period is defined during which the AC/DC converter is set to an off state.
In a specific embodiment, the first time end is a power price flat period.
Further, a second time period is defined, and in the second time period, the AC/DC converter is set to work in an AC-to-DC state to charge the energy storage battery.
In a specific embodiment, the second time end is a power price valley period.
Further, a third time period is defined, in the third time period, the AC/DC converter is set to work in a direct current-to-alternating current state, the energy storage battery discharges, and the energy storage battery supplies power to the load through the AC/DC converter.
In a specific embodiment, the third time end is a power rate peak period.
Further, when the first input source and the second input source are both abnormal or as required, the first control switch and the second control switch are closed, the AC/DC converter is set to work in a direct current-to-alternating current state, the energy storage battery discharges, and the energy storage battery supplies power to the load through the AC/DC converter.
Further, the AC/DC converter is set to work in a direct current-to-alternating current state and is operated in parallel with the first input source or the second input source, so that the energy storage battery and the first input source or the second input source jointly supply power to the load.
Further, the first control switch and the second control switch are mechanical switches or electronic switches.
Preferably, the first control switch and the second control switch are bidirectional thyristors. The bidirectional thyristor comprises a first thyristor and a second thyristor, and the two thyristors are driven separately; when the first control switch or the second control switch is switched on, the first thyristor is driven to be switched on and the second thyristor is driven to be switched off in the positive half cycle of the input source voltage, and the second thyristor is driven to be switched on and the first thyristor is driven to be switched off in the negative half cycle of the input source voltage.
Further, when the first input source or the second input source supplies power to the load, the AC/DC converter is arranged to work in parallel with the first input source or the second input source so as to compensate reactive and harmonic currents of the load, improve current harmonic indexes of the input sources and reduce pollution to the input sources.
The invention also provides an uninterruptible power supply device which comprises a plurality of input ends, an output end, an AC/DC converter and an energy storage battery; a control switch is connected between any input end and the output end; one end of any control switch is connected with the corresponding input end, and the other end of the control switch is respectively connected with the output end and the AC port of the AC/DC converter; and the DC port of the AC/DC converter is connected with the energy storage battery.
The uninterrupted power supply device has the following technical effects:
1. the uninterrupted power system has high power supply reliability and high efficiency.
The system has at least two input sources, and any one input source can supply power to the load normally. When all input sources are abnormal, the energy storage battery is discharged through the AC/DC converter to supply power to the load, and the reliability of system power supply is improved.
When the input source is normal, only one switch is lost on a power supply loop from the input source to the load, and the system efficiency is high.
2. The reactive power and harmonic current of the load can be compensated through the AC/DC converter, and the pollution of the load to a power grid is reduced.
When any input source supplies power to the load, the AC/DC converter can work in parallel with the input source, and compensates reactive and harmonic currents of the load, improves current harmonic indexes of the input source, and reduces pollution to the input source.
3. The uninterruptible power supply device can realize energy storage and realize peak clipping and valley filling of a power grid.
In the valley period of the electricity price, the electricity price is low, and the system charges the energy storage battery through the AC/DC converter to absorb the electric energy of the power grid; in the electricity price balancing time period, the electricity price is at the intermediate value, and the energy storage battery is not charged or discharged; in the peak period of the electricity price, the electricity price is high, the energy storage battery is discharged through the AC/DC converter to supply power to the load, and the system can reduce the electric energy requirement on the power grid, so that the peak clipping and valley filling of the power grid are realized.
4. The influence of the short circuit on the input source side on the load power supply is avoided.
The control switch adopts a bidirectional thyristor, and the two thyristors (the first thyristor and the second thyristor) are driven separately. When the control switch is switched on, the first thyristor is driven to be switched on and the second thyristor is driven to be switched off in the positive half cycle of the input source voltage; and driving the second thyristor to be conducted and the first thyristor to be switched off in the negative half cycle of the input source voltage. Therefore, when the input source has a short-circuit fault, the output of the AC/DC converter cannot flow back to the input side, and the power supply safety of the load can be ensured.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
Fig. 1 is a schematic diagram of a system configuration of a conventional double conversion UPS;
FIG. 2 is a system architecture diagram of one embodiment of the present invention;
FIG. 3 is a dashed line on the structure of FIG. 2 indicating the power supply path when the system is operating in run mode 1;
FIG. 4 is a dashed line on the structure of FIG. 2 indicating the power supply path when the system is operating in run mode 2;
FIG. 5 is a dashed line on the structure of FIG. 2 indicating the power supply path when the system is operating in run mode 3;
FIG. 6 is a dashed line on the structure of FIG. 2 indicating the power supply path when the system is operating in run mode 4;
FIG. 7 is a dashed line on the structure of FIG. 2 indicating the power supply path when the system is operating in run mode 5;
FIG. 8 is a dashed line on the structure of FIG. 2 indicating the power supply path when the system is operating in run mode 6;
FIG. 9 is a dashed line on the structure of FIG. 2 indicating the power supply path when the system is operating in run mode 7;
FIG. 10 is a schematic diagram of the structure of a control switch in one embodiment of the invention;
FIG. 11 is a state diagram of the actuation of the control switch in one embodiment of the present invention;
figure 12 is a schematic illustration of a power usage strategy employed in one embodiment of the present invention.
Description of reference numerals:
1-an input source, 2-an input source,
3-load, 100-input,
the number of the transistors 101-thyristor, 102-thyristor,
110-a control switch, 200-an input terminal,
210-control switch, 300-output terminal,
400-AC/DC converter, 500-energy storage battery.
Detailed Description
In the description of the embodiments of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the invention. The drawings are schematic diagrams or conceptual diagrams, and the relationship between the thickness and the width of each part, the proportional relationship between the parts and the like are not completely consistent with actual values.
Fig. 2 is a schematic diagram of a system structure according to an embodiment of the present invention, which includes an input terminal 100, an input terminal 200, an output terminal 300, a control switch 110, a control switch 210, an AC/DC converter 400, and an energy storage battery 500.
One end of the control switch 110 is connected to the input terminal 100, and the other end is connected to the output terminal 300 and the AC port of the AC/DC converter 400; one end of the control switch 210 is connected to the input end 200, and the other end is connected to the output end 300 and the AC port of the AC/DC converter 400; the DC port of the AC/DC converter 400 is connected to the energy storage battery 500. Input 100 and input 200 are ac power input ports and output 300 is an ac power output port.
When in use, as shown in fig. 2, the input source 1 and the input source 2 are two different power supplies (such as commercial power), the input terminal 100 is connected to the input source 1, the input terminal 200 is connected to the input source 2, and the output terminal 300 is connected to the load 3.
The operation mode of the uninterruptible power supply device of the embodiment is as follows:
operation mode 1: when the input source 1 is normal, the control switch 110 is set to the on state, the control switch 210 is set to the off state, and the AC/DC converter 400 is set to the off state.
In this mode, the load 3 is supplied solely by the input source 1, as shown in fig. 3.
Operation mode 2: under the condition that the input source 1 is normal, the control switch 110 is set to be in an on state, the control switch 210 is set to be in an off state, and the AC/DC converter 400 is in an operating state, specifically, in an AC-to-DC state, to charge the energy storage battery 500.
In this mode, the load 3 is supplied by the input source 1 alone and the energy storage battery 500 is charged, and the AC/DC converter 400 can compensate the reactive and harmonic currents of the load 3 at the same time, reducing the current distortion of the input source 1, as shown in fig. 4.
Operation mode 3: when the input source 1 is normal, the control switch 110 is set to the on state, the control switch 210 is set to the off state, the AC/DC converter 400 is in the operating state, specifically, in the DC-to-AC state, and the energy storage battery 500 is discharged.
In this mode, the input source 1 and the AC/DC converter 400 operate in parallel, and the input source 1 and the energy storage battery 500 together supply power to the load 3, and at this time, the AC/DC converter 400 can compensate the reactive and harmonic currents of the load 3 at the same time, and reduce the current distortion of the input source 1, as shown in fig. 5.
Operation mode 4: the control switch 110 is set to the off state, the control switch 210 is set to the off state, the AC/DC converter 400 is set to the working state, specifically, the DC-AC state, and the energy storage battery 500 is discharged.
In this mode, the load 3 is supplied solely by the energy storage battery 500 through the AC/DC converter 400, as shown in fig. 6.
Operation mode 5: in the case where the input source 2 is normal, the control switch 110 is set to the off state, the control switch 210 is set to the on state, and the AC/DC converter 400 is set to the off state.
In this mode, the load 3 is supplied solely by the input source 2, as shown in fig. 7.
Operation mode 6: under the condition that the input source 2 is normal, the control switch 110 is set to be in an off state, the control switch 210 is set to be in an on state, and the AC/DC converter 400 is in an operating state, specifically, in an AC-to-DC state, to charge the energy storage battery 500.
In this mode, the load 3 is supplied by the input source 2 alone and the energy storage battery 500 is charged, and the AC/DC converter 400 can compensate the reactive and harmonic currents of the load 3 at the same time, reducing the current distortion of the input source 2, as shown in fig. 8.
Operation mode 7: when the input source 2 is normal, the control switch 110 is set to the off state, the control switch 210 is set to the on state, the AC/DC converter 400 is in the operating state, specifically, in the DC-to-AC state, and the energy storage battery 500 is discharged.
In this mode, the input source 2 and the AC/DC converter 400 operate in parallel, and the input source 2 and the energy storage battery 500 together supply power to the load 3, and at this time, the AC/DC converter 400 can compensate the reactive and harmonic currents of the load 3 at the same time, and reduce the current distortion of the input source 2, as shown in fig. 9.
In practical application, under the condition that the input source 1 and the input source 2 are normal, any one of the operation modes can be selected according to requirements; under the condition that the input source 1 is normal and the input source 2 is abnormal, the operation modes 1-4 can be selected according to requirements; under the condition that the input source 1 is abnormal and the input source 2 is normal, the operation modes 4-7 can be selected according to requirements; when an abnormality (e.g., a power failure) occurs in both the input source 1 and the input source 2, the above-described operation mode 4 is selected.
The uninterruptible power supply device of the embodiment adopts two input ends which are respectively connected with different input sources, and any one input source can supply power to a load when being normal. When the input source 1 and the input source 2 are both abnormal, the energy storage battery is discharged through the AC/DC converter 400 to supply power to the load 3, so that the power supply reliability of the system is improved. When the input source 1 or the input source 2 is normal, only one control switch is lost on a power supply loop from the input source to a load, and the system efficiency is high.
In the states of the operation modes 2, 3, 6 and 7, when the input source 1 or the input source 2 supplies power to the load 3, the AC/DC converter 400 can work in parallel with the input source 1 or the input source 2, compensate the reactive and harmonic currents of the load 3, improve the current harmonic indexes of the input source and reduce the pollution to the input source. In the operating mode 2, 6 state, the charging current may be 0.
The control switch 110 and the control switch 210 in this embodiment may be mechanical switches or electronic switches. Preferably, the control switch 110 and the control switch 210 may adopt a bidirectional thyristor, that is, a mode of connecting two unidirectional thyristors in anti-parallel, as shown in fig. 10, taking the control switch 110 as an example, which includes the thyristor 101 and the thyristor 102 connected in anti-parallel. The thyristor has the advantages of being capable of achieving millisecond-level on-off control and good in real-time performance.
In order to avoid the influence of the short circuit on the input source side on the load supply, and still taking fig. 9 as an example, thyristor 101 and thyristor 102 are driven separately. When the control switch 110 is turned on, the thyristor 101 is driven to be turned on and the thyristor 102 is driven to be turned off in the positive half cycle of the input source 1 voltage, and the thyristor 102 is driven to be turned on and the thyristor 101 is driven to be turned off in the negative half cycle of the input source voltage, as shown in fig. 11. Therefore, when the input source has a short-circuit fault, the output of the AC/DC converter cannot flow back to the input side, and the power supply safety of the load can be ensured. The same applies to the control switch 210.
In the present embodiment, the following policy is implemented for selection of each operation mode, see fig. 12.
1. In the valley period of the electricity price, the electricity price is low, the AC/DC converter 400 is set to be in a working state, specifically, to be in an AC-to-DC state, to charge the energy storage battery 500 and absorb the electric energy of the power grid, and the above operation mode 2 or operation mode 6 may be selected to implement;
2. in the electricity price average period, the electricity price is at the intermediate value, the AC/DC converter 400 is set to be in the off state, the energy storage battery 500 is neither charged nor discharged, and the above-mentioned operation mode 1 or operation mode 5 can be selected to implement;
3. in the peak period of the electricity price, the electricity price is high, the AC/DC converter 400 is in a working state, specifically, in a direct current to alternating current state, the energy storage battery 500 discharges, the load 3 is supplied with power through the AC/DC converter 400, the system can reduce the electric energy requirement on the power grid, and the above operation modes 3, 4 and 7 can be selected to realize the operation.
By implementing the strategy, peak clipping and valley filling of the power grid are realized.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. An uninterruptible power supply device is characterized by comprising a first input end, a second input end, an output end, a first control switch, a second control switch, an AC/DC converter and an energy storage battery; one end of the first control switch is connected with the first input end, and the other end of the first control switch is respectively connected with the output end and an AC port of the AC/DC converter; one end of the second control switch is connected with the second input end, and the other end of the second control switch is respectively connected with the output end and an AC port of the AC/DC converter; the DC port of the AC/DC converter is connected with the energy storage battery; the first input end is connected with a first input source, the second input end is connected with a second input source, and the output end is connected with a load.
2. The uninterruptible power supply apparatus of claim 1, wherein the first input source or the second input source is selected to power the load by control of the first control switch and the second control switch.
3. The uninterruptible power supply apparatus of claim 2, wherein the state of the AC/DC converter is set according to a period of time while the first input source or the second input source is supplying power to the load.
4. The uninterruptible power supply apparatus of claim 3, wherein a first time period is defined during which the AC/DC converter is set to an off state;
defining a second time period, and setting the AC/DC converter to work in an AC-to-DC state to charge the energy storage battery in the second time period;
and defining a third time period, setting the AC/DC converter to work in a direct current-to-alternating current state in the third time period, discharging the energy storage battery, and supplying power to the load through the AC/DC converter by the energy storage battery.
5. The uninterruptible power supply apparatus according to claim 1, wherein when the first input source and the second input source are both abnormal or as needed, the first control switch and the second control switch are turned off, the AC/DC converter is set to operate in a DC-to-AC state, the energy storage battery is discharged, and the energy storage battery supplies power to the load through the AC/DC converter.
6. The uninterruptible power supply apparatus of claim 1, wherein the AC/DC converter is configured to operate in a DC-to-AC state and operate in parallel with the first input source or the second input source, such that the energy storage battery and the first input source or the second input source together provide power to the load.
7. The uninterruptible power supply apparatus of claim 1, wherein the first control switch and the second control switch employ triacs.
8. The uninterruptible power supply apparatus of claim 7, wherein the triac includes a first thyristor and a second thyristor, the thyristors being driven separately; when the first control switch or the second control switch is switched on, the first thyristor is driven to be switched on and the second thyristor is driven to be switched off in the positive half cycle of the input source voltage, and the second thyristor is driven to be switched on and the first thyristor is driven to be switched off in the negative half cycle of the input source voltage.
9. The uninterruptible power supply apparatus of claim 2, wherein when the first input source or the second input source is supplying power to the load, the AC/DC converter is configured to operate in parallel with the first input source or the second input source to compensate for reactive and harmonic currents of the load, improve current harmonics of the input sources, and reduce pollution of the input sources.
10. An uninterrupted power supply device is characterized by comprising a plurality of input ends, an output end, an AC/DC converter and an energy storage battery; a control switch is connected between any input end and the output end; one end of any control switch is connected with the corresponding input end, and the other end of the control switch is respectively connected with the output end and the AC port of the AC/DC converter; and the DC port of the AC/DC converter is connected with the energy storage battery.
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| CN202010515898.1A CN111600376A (en) | 2020-06-09 | 2020-06-09 | Uninterruptible power supply device |
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| CN202010515898.1A CN111600376A (en) | 2020-06-09 | 2020-06-09 | Uninterruptible power supply device |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202424295U (en) * | 2012-01-19 | 2012-09-05 | 青岛经济技术开发区创统科技发展有限公司 | Inverter power supply and power supply system applying same |
| CN104917281A (en) * | 2015-06-01 | 2015-09-16 | 深圳市盛弘电气有限公司 | Zero-switching circuit for inverter and commercial power and method for the same |
| US20160134147A1 (en) * | 2013-06-13 | 2016-05-12 | Firebright1 Green Energy(Shanghai) Limited. | Battery Energy Storage System and Controlling Method |
| CN107332266A (en) * | 2017-08-25 | 2017-11-07 | 浙江南都电源动力股份有限公司 | User side energy-accumulating power station and its application model |
| CN110504687A (en) * | 2019-08-16 | 2019-11-26 | 深圳市伊力科电源有限公司 | Power quality harnessed synthetically system and method |
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2020
- 2020-06-09 CN CN202010515898.1A patent/CN111600376A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202424295U (en) * | 2012-01-19 | 2012-09-05 | 青岛经济技术开发区创统科技发展有限公司 | Inverter power supply and power supply system applying same |
| US20160134147A1 (en) * | 2013-06-13 | 2016-05-12 | Firebright1 Green Energy(Shanghai) Limited. | Battery Energy Storage System and Controlling Method |
| CN104917281A (en) * | 2015-06-01 | 2015-09-16 | 深圳市盛弘电气有限公司 | Zero-switching circuit for inverter and commercial power and method for the same |
| CN107332266A (en) * | 2017-08-25 | 2017-11-07 | 浙江南都电源动力股份有限公司 | User side energy-accumulating power station and its application model |
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Application publication date: 20200828 |