Uninterruptible power supply system

Abstract

The invention provides an uninterruptible power supply system which comprises an energy storage module, a mains supply is electrically connected to the power supply end of the energy storage module, and the power supply end of the energy storage module is electrically connected to a load through a power supply inverter. A maintenance bypass is arranged between the commercial power and the load and comprises a bypass switch. And the bypass switch is closed when the energy storage module is overhauled, so that the mains supply supplies power to the load. Under the condition that the mains supply operates stably, the mains supply is input to the charging end of the energy storage module to charge the energy storage module. When the mains supply stops supplying power, the power supply end of the energy storage module outputs current, the current flows into the load through the inverter, and the energy storage module supplies power to the load. If the uninterruptible power supply system breaks down, the bypass switch is closed, the maintenance bypass plays a role in electrically connecting the commercial power and the load, and the current of the commercial power flows into the load through the maintenance bypass to supply power to the load. By adopting the uninterruptible power supply system disclosed by the invention, uninterruptible power supply can be realized when each module is overhauled.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply systems, and in particular to an uninterruptible power supply system. Background Art

[0002] Traditional lead-acid batteries are prone to degradation of battery performance and shortened battery life when in a long-term floating charge state. At the same time, lead-acid batteries have environmental pollution problems and do not meet the current green and environmental protection requirements. Therefore, finding a high-performance, long-life and environmentally friendly energy storage battery to replace lead-acid batteries has become the improvement direction of UPS systems, i.e. uninterruptible power supply systems.

[0003] The power quality problem has become one of the important issues facing the current power system, especially with the rapid development and widespread application of information technology, higher requirements have been put forward for the reliability and stability of the power system. In this context, the existing technology mainly uses the technical solution of uninterruptible power supply + battery. The uninterruptible power supply system is a kind of power equipment that can provide stable and high-quality power supply, and is widely used in many fields. By improving the power quality of the uninterruptible power supply system, the power supply reliability can be improved, and equipment failures and energy losses caused by power quality problems can be reduced. If the uninterruptible power supply system fails, the uninterruptible power supply system needs to be shut down for maintenance, and it cannot guarantee that the backup power supply will continuously supply power to the load, resulting in the need for power outages for important loads, making it impossible for the uninterruptible power supply system to achieve uninterruptible power supply.

[0004] Therefore, there is a need for a power supply system that can achieve uninterrupted power supply by allowing the mains power to supply power to the load when a failure occurs in the uninterruptible power supply system and each module is being repaired. Summary of the invention

[0005] In order to overcome the problems existing in the related art, the purpose of the present invention is to provide an uninterruptible power supply system, in which when a system failure occurs and each module is under repair, the mains power can still supply power to the load, thereby achieving uninterrupted power supply.

[0006] An uninterruptible power supply system comprises an energy storage module, wherein a mains supply is electrically connected to a power supply end of the energy storage module, and the power supply end of the energy storage module is electrically connected to a load via a power supply inverter; a maintenance bypass is also provided between the mains supply and the load, and the maintenance bypass comprises a bypass switch; the bypass switch is closed when the energy storage module is inspected to enable the mains supply to supply power to the load.

[0007] When the mains power is running stably, the mains power is input to the charging end of the energy storage module to charge the energy storage module. When the mains power stops supplying power, the power supply end of the energy storage module outputs current, and the current flows into the load through the inverter. At this time, the energy storage module supplies power to the load. When the energy storage battery supplies power to the load, if the uninterruptible power supply system is overloaded, short-circuited and / or the inverter fails, the bypass switch is closed, and the maintenance bypass plays the role of electrically connecting the mains power and the load. The mains power current flows into the load through the maintenance bypass to supply power to the load. With the uninterruptible power supply system of the present invention, when a system failure occurs and each module is under maintenance, the mains power can still supply power to the load, thereby achieving uninterruptible power supply.

[0008] In a preferred technical solution of the present invention, the energy storage module includes an energy storage battery group and an energy storage inverter, the energy storage battery group is electrically connected to the output end of the energy storage inverter, and the input end of the energy storage inverter is electrically connected to the mains.

[0009] The energy storage inverter is used to control the charging and discharging process of the energy storage battery pack. When charging the energy storage inverter, the energy storage inverter converts the AC power of the mains into DC power and uses DC power to charge the energy storage battery pack. When the energy storage battery pack discharges, the energy storage inverter disconnects the connection line between the mains and the energy storage battery pack, so that the energy storage battery pack outputs AC power to supply power to the load. The energy storage inverter consists of a DC / AC bidirectional converter and a control unit, which can realize bidirectional conversion of electric energy and conversion between AC and DC.

[0010] In a preferred technical solution of the present invention, the uninterruptible power supply system further comprises a rectifier module, an input end of the rectifier module is electrically connected to the mains power, and an output end of the rectifier module is electrically connected to the load.

[0011] The rectifier module first converts the AC power of the mains into DC power, filters the DC power, and then converts the filtered DC power into AC power to provide to the load.

[0012] In a preferred technical solution of the present invention, the rectifier module includes a rectifier and a power supply inverter, the input end of the rectifier is electrically connected to the AC power, the output end of the rectifier is electrically connected to the input end of the power supply inverter, and the output end of the power supply inverter is electrically connected to the load.

[0013] The mains power is input to the input end of the rectifier. The rectifier converts the mains power in the form of AC into DC, and then filters the DC. The output end of the rectifier outputs the filtered DC. The power inverter converts the filtered DC into AC, and then supplies the AC to the load. During the peak power consumption period, if the mains power supply is normal, the mains power is connected to the rectifier module, and the AC is supplied to the load after rectification by the rectifier module to drive the load to operate.

[0014] In a preferred technical solution of the present invention, a rectifier switch is provided between the rectifier and the mains power.

[0015] The rectifier switch is closed to connect the mains power to the input end of the rectifier; the rectifier switch is opened to disconnect the mains power from the input end of the rectifier.

[0016] In a preferred technical solution of the present invention, a main charging switch is provided between the power supply inverter and the load.

[0017] The main charging switch is closed to electrically connect the output end of the power supply inverter to the load; the main charging switch is opened to disconnect the output end of the power supply inverter from the load.

[0018] In a preferred technical solution of the present invention, the power supply end of the energy storage battery pack is electrically connected to the output end of the rectifier.

[0019] The output end of the rectifier is electrically connected to the input end of the power supply inverter. When the energy storage battery pack supplies power to the load, current flows out from the power supply end of the energy storage battery pack and then flows into the load through the power supply inverter to drive the load to operate.

[0020] In a preferred technical solution of the present invention, a diode is arranged between the energy storage battery pack and the rectifier, the anode of the diode is electrically connected to the power supply end of the energy storage battery pack, and the cathode of the diode is electrically connected to the output end of the rectifier.

[0021] When the anode voltage of the diode is greater than the cathode voltage of the diode, the diode is turned on; when the anode voltage of the diode is less than or equal to the cathode voltage of the diode, the diode is cut off. When the diode is in the on state, the difference between the anode voltage of the diode and the cathode voltage of the diode is greater than or equal to the on voltage.

[0022] In a preferred technical solution of the present invention, the uninterruptible power supply system further comprises a static switch, a first end of the static switch is electrically connected to the mains power, and a second end of the static switch is electrically connected to an output end of the power supply inverter.

[0023] A static bypass switch is provided between the static switch and the mains. When the static bypass switch, the static switch and the main charging switch are all closed, the mains is connected to the load to supply power to the load. The branch where the static switch is located is connected in parallel with the maintenance bypass. When the uninterruptible power supply system is overloaded, short-circuited and / or the power supply inverter fails, the static switch is closed to connect the mains to the load to prevent the circuit structure of the uninterruptible power supply system from being damaged and causing the power supply to the load to be terminated. Combined with the branch where the static switch is located and the maintenance bypass, uninterrupted power supply to the load can be guaranteed.

[0024] In a preferred technical solution of the present invention, the uninterruptible power supply system also includes an energy management module and a battery management module, the energy management module is electrically connected to the energy storage inverter, and the battery management module is electrically connected to the energy storage battery pack; the energy management module is used to control the charging and discharging of the energy storage battery pack, and the energy storage battery pack is used to monitor the working status of the energy storage battery pack.

[0025] The energy management module is used to monitor, manage and control the entire uninterruptible power supply system, including formulating charging and discharging strategies and executing charging and discharging strategies. The energy management module is also used to coordinate the uninterruptible power supply system of the present invention and other power equipment to operate together. The battery management module is used to detect the working state of the energy storage battery pack, which includes parameters such as the voltage, current and temperature of the energy storage battery pack to ensure the safe operation and efficient use of the energy storage battery pack.

[0026] The beneficial effects of the present invention are:

[0027] The present invention provides an uninterruptible power supply system, including an energy storage module, a mains supply is electrically connected to a power supply end of the energy storage module, and the power supply end of the energy storage module is electrically connected to a load through a power supply inverter; a maintenance bypass is also provided between the mains supply and the load, and the maintenance bypass includes a bypass switch; the bypass switch is closed when the energy storage module is overhauled, so that the mains supply supplies power to the load. When the mains supply is stable, the mains supply is input to the charging end of the energy storage module to charge the energy storage module. When the mains supply stops supplying power, the power supply end of the energy storage module outputs current, and the current flows into the load through the inverter, and the energy storage module supplies power to the load. When the energy storage battery supplies power to the load, if the uninterruptible power supply system is overloaded, short-circuited, and / or the inverter fails, the bypass switch is closed, and the maintenance bypass plays a role in electrically connecting the mains supply and the load, and the current of the mains supply flows into the load through the maintenance bypass to supply power to the load. With the uninterruptible power supply system of the present invention, when a system failure occurs and each module is overhauled, the mains supply can still supply power to the load, thereby achieving uninterruptible power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the present invention using an energy storage module or a maintenance bypass to supply power to a load;

[0029] Figure 2 is a schematic diagram of an uninterruptible power supply system of the present invention;

[0030] Figure 3 It is a control flow chart of the uninterruptible power supply system of the present invention.

[0031] Figure numerals: 1. Energy storage module; 2. AC power; 3. Power supply end; 4. Power supply inverter; 5. Load; 6. Maintenance bypass; 7. Bypass switch; 8. Energy storage battery pack; 9. Energy storage inverter; 10. Rectifier module; 11. Rectifier; 12. Rectifier switch; 13. Main charging switch; 14. Diode; 15. Static switch; 16. Energy management module; 17. Battery management module. DETAILED DESCRIPTION

[0032] The preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0033] Example 1

[0034] like Figure 1-Figure 2 As shown, this embodiment provides an uninterruptible power supply system, including an energy storage module 1, a mains power 2 electrically connected to a power supply end 3 of the energy storage module 1, and the power supply end 3 of the energy storage module 1 is electrically connected to a load 5 through a power supply inverter 4; a maintenance bypass 6 is also provided between the mains power 2 and the load 5, and the maintenance bypass 6 includes a bypass switch 7; the bypass switch 7 is closed when the energy storage module 1 is inspected, so that the mains power 2 supplies power to the load 5.

[0035] Energy storage module 1 is used to store electrical energy. Energy storage module 1 uses lithium batteries. Compared with lead-acid batteries, lithium batteries have higher energy density and can store more energy. Lithium batteries have a longer service life, that is, lithium batteries can undergo more charge and discharge cycles before their capacity is significantly reduced. Lithium batteries have higher charging efficiency, less energy loss during charging, and are lighter in weight.

[0036] The power supply end 3 of the energy storage module 1 is electrically connected to the mains 2 and the input end of the power supply inverter 4, and the output end of the power supply inverter 4 is electrically connected to the load 5. When the mains 2 is running stably, the mains 2 is used to charge the energy storage module 1 in the first time period of each day, such as the low power consumption period. In the second time period of each day, such as the peak power consumption period, the energy storage module 1 is used to supply power to the load 5.

[0037] During the charging process of the energy storage module 1, the current of the mains 2 flows into the power supply terminal 3 of the energy storage module 1 to charge the energy storage module 1. During the discharging process of the energy storage module 1, the current flows from the power supply terminal 3 of the energy storage module 1 through the power supply inverter 4 to the load 5 to supply power to the load 5.

[0038] During the discharge process of the energy storage module 1 , the power supply end 3 of the energy storage module 1 outputs alternating current, which is converted into direct current by the power supply inverter 4 , and then provided to the load 5 .

[0039] The first end of the maintenance bypass 6 is electrically connected to the mains 2, and the second end is electrically connected to the load 5. If the energy storage module 1 cannot supply power to the load 5 due to a fault, the uninterruptible power supply system is overloaded, the uninterruptible power supply system is short-circuited, and / or the power supply inverter 4 fails, the uninterruptible power supply system switches to the maintenance bypass 6, the mains 2 is electrically connected to the load 5, and the mains 2 is used to directly supply power to the load 5.

[0040] The present embodiment provides an uninterruptible power supply system, including an energy storage module 1, a mains power 2 electrically connected to a power supply end 3 of the energy storage module 1, and the power supply end 3 of the energy storage module 1 is electrically connected to a load 5 via a power supply inverter 4; a maintenance bypass 6 is also provided between the mains power 2 and the load 5, and the maintenance bypass 6 includes a bypass switch 7; the bypass switch 7 is closed when the energy storage module 1 is inspected, so that the mains power 2 supplies power to the load 5. When the mains power 2 is operating stably, the mains power 2 is input to the charging end of the energy storage module 1 to charge the energy storage module 1. When the mains power 2 stops supplying power, the power supply end 3 of the energy storage module 1 outputs current, and the current flows into the load 5 via the power supply inverter 4, and at this time the energy storage module 1 supplies power to the load 5. When the energy storage battery supplies power to the load 5, if the uninterruptible power supply system is overloaded, short-circuited and / or the power inverter 4 fails, the bypass switch 7 is closed, the maintenance bypass 6 plays a role in electrically connecting the mains 2 and the load 5, and the current of the mains 2 flows into the load 5 through the maintenance bypass 6 to supply power to the load 5. With the uninterruptible power supply system of the present invention, when the system fails and each module is repaired, the mains 2 can still supply power to the load 5, thereby achieving uninterrupted power supply.

[0041] Example 2

[0042] like Figure 1-Figure 2 As shown, this embodiment provides an uninterruptible power supply system, including an energy storage module 1, a mains power 2 electrically connected to a power supply end 3 of the energy storage module 1, and the power supply end 3 of the energy storage module 1 is electrically connected to a load 5 through a power supply inverter 4; a maintenance bypass 6 is also provided between the mains power 2 and the load 5, and the maintenance bypass 6 includes a bypass switch 7; the bypass switch 7 is closed when the energy storage module 1 is inspected, so that the mains power 2 supplies power to the load 5.

[0043] The energy storage module 1 includes an energy storage battery group 8 and an energy storage inverter 9 . The energy storage battery group 8 is electrically connected to the output end of the energy storage inverter 9 , and the input end of the energy storage inverter 9 is electrically connected to the mains 2 .

[0044] The energy storage battery group 8 is composed of a plurality of lithium batteries connected in series. The energy storage battery group 8 is small in size, occupies a small space, and has a long service life. The energy storage inverter 9 is used to control the charging and discharging process of the energy storage battery group 8. When charging the energy storage inverter 9, the energy storage inverter 9 converts the AC power of the mains 2 into DC power, and uses the DC power to charge the energy storage battery group 8; when the energy storage battery group 8 is discharged, the energy storage inverter 9 disconnects the connection line between the mains 2 and the energy storage battery group 8, so that the energy storage battery group 8 outputs AC power to supply power to the load 5. The energy storage inverter 9 is composed of a DC / AC bidirectional converter and a control unit, etc., which can realize bidirectional conversion of electric energy and conversion between AC and DC.

[0045] The uninterruptible power supply system further includes a rectifier module 10 , an input end of the rectifier module 10 is electrically connected to the mains 2 , and an output end of the rectifier module 10 is electrically connected to the load 5 .

[0046] The rectifier module 10 includes a rectifier 11 and a power supply inverter 4 , the input end of the rectifier 11 is electrically connected to the mains 2 , the output end of the rectifier 11 is electrically connected to the input end of the power supply inverter 4 , and the output end of the power supply inverter 4 is electrically connected to the load 5 .

[0047] The rectifier module 10 first converts the AC power of the mains 2 into DC power, filters the DC power, and then converts the filtered DC power into AC power and provides it to the load 5. The mains 2 is input to the input end of the rectifier 11, and the rectifier 11 converts the mains 2 in the form of AC power into DC power, and then filters the DC power. The output end of the rectifier 11 outputs the filtered DC power. The power inverter 4 converts the filtered DC power into AC power, and then provides the AC power to the load 5. During the peak power consumption period, if the mains 2 is supplying power normally, the mains 2 is connected to the rectifier module 10, and the AC power is provided to the load 5 after rectification by the rectifier module 10. To drive the load 5 to operate.

[0048] The types of rectifier 11 include unidirectional rectifier 11, three-phase rectifier 11 and switching rectifier 11. Rectifier 11 can be made of vacuum tube, ignition tube, solid silicon semiconductor diode 14 and mercury arc.

[0049] The energy storage module 1 of this embodiment includes an energy storage battery group 8 and an energy storage inverter 9, wherein the energy storage battery group 8 is electrically connected to the output end of the energy storage inverter 9, and the input end of the energy storage inverter 9 is electrically connected to the mains 2. The uninterruptible power supply system also includes a rectifier module 10, wherein the input end of the rectifier module 10 is electrically connected to the mains 2, and the output end of the rectifier module 10 is electrically connected to the load 5. The rectifier module 10 includes a rectifier 11 and a power supply inverter 4, wherein the input end of the rectifier 11 is electrically connected to the mains 2, the output end of the rectifier 11 is electrically connected to the input end of the power supply inverter 4, and the output end of the power supply inverter 4 is electrically connected to the load 5. The mains 2 is input to the input end of the rectifier 11, and the rectifier 11 converts the mains 2 in the form of AC into DC, and then filters the DC, and the output end of the rectifier 11 outputs the filtered DC. The power supply inverter 4 converts the filtered DC into AC, and then provides the AC to the load 5.

[0050] Example 3

[0051] like Figure 1-Figure 2 As shown, this embodiment provides an uninterruptible power supply system, including an energy storage module 1, a mains power 2 electrically connected to a power supply end 3 of the energy storage module 1, and the power supply end 3 of the energy storage module 1 is electrically connected to a load 5 through a power supply inverter 4; a maintenance bypass 6 is also provided between the mains power 2 and the load 5, and the maintenance bypass 6 includes a bypass switch 7; the bypass switch 7 is closed when the energy storage module 1 is inspected, so that the mains power 2 supplies power to the load 5.

[0052] A rectifier switch 12 is provided between the rectifier 11 and the mains 2 , and a main charging switch 13 is provided between the power supply inverter 4 and the load 5 .

[0053] The rectifier switch 12 is closed to electrically connect the mains 2 to the input end of the rectifier 11; the rectifier switch 12 is opened to disconnect the mains 2 from the input end of the rectifier 11. The main charging switch 13 is closed to electrically connect the output end of the power supply inverter 4 to the load 5; the main charging switch 13 is opened to disconnect the output end of the power supply inverter 4 from the load 5.

[0054] The rectifier switch 12 and the main charging switch 13 are closed at the same time to enable the AC power 2 to directly supply power to the load 5 ; the rectifier switch 12 and the main charging switch 13 are opened at the same time to disconnect the electrical connection between the AC power 2 and the load 5 .

[0055] In this embodiment, a rectifier switch 12 is provided between the rectifier 11 and the main power 2, and a main charging switch 13 is provided between the power supply inverter 4 and the load 5. The rectifier switch 12 and the main charging switch 13 are closed at the same time to realize that the main power 2 directly supplies power to the load 5; the rectifier switch 12 and the main charging switch 13 are opened at the same time to disconnect the electrical connection between the main power 2 and the load 5.

[0056] Example 4

[0057] like Figure 1-Figure 2 As shown, this embodiment provides an uninterruptible power supply system, including an energy storage module 1, a mains power 2 electrically connected to a power supply end 3 of the energy storage module 1, and the power supply end 3 of the energy storage module 1 is electrically connected to a load 5 through a power supply inverter 4; a maintenance bypass 6 is also provided between the mains power 2 and the load 5, and the maintenance bypass 6 includes a bypass switch 7; the bypass switch 7 is closed when the energy storage module 1 is inspected, so that the mains power 2 supplies power to the load 5.

[0058] The energy storage module 1 includes an energy storage battery group 8 and an energy storage inverter 9 . The energy storage battery group 8 is electrically connected to the output end of the energy storage inverter 9 , and the input end of the energy storage inverter 9 is electrically connected to the mains 2 .

[0059] The uninterruptible power supply system further includes a rectifier module 10 , an input end of the rectifier module 10 is electrically connected to the mains 2 , and an output end of the rectifier module 10 is electrically connected to the load 5 .

[0060] The rectifier module 10 includes a rectifier 11 and a power supply inverter 4 , the input end of the rectifier 11 is electrically connected to the mains 2 , the output end of the rectifier 11 is electrically connected to the input end of the power supply inverter 4 , and the output end of the power supply inverter 4 is electrically connected to the load 5 .

[0061] The power supply end 3 of the energy storage battery group 8 is electrically connected to the output end of the rectifier 11, and a diode 14 is arranged between the energy storage battery group 8 and the rectifier 11, the anode of the diode 14 is electrically connected to the power supply end 3 of the energy storage battery group 8, and the cathode of the diode 14 is electrically connected to the output end of the rectifier 11.

[0062] The uninterruptible power supply system further includes a static switch 15 , a first end of the static switch 15 is electrically connected to the mains 2 , and a second end of the static switch 15 is electrically connected to an output end of the power supply inverter 4 .

[0063] The diode 14 has unidirectional conductivity. When the anode voltage U2 of the diode 14 is greater than the cathode voltage U1 of the diode 14, the diode 14 is turned on; when the anode voltage U2 of the diode 14 is less than or equal to the cathode voltage U1 of the diode 14, the diode 14 is turned off. When the diode 14 is in the on state, the difference between the anode voltage U2 of the diode 14 and the cathode voltage U1 of the diode 14 is greater than or equal to the on voltage.

[0064] When the mains 2 is interrupted, the energy storage battery group 8 is used to supply power to the load 5. The power supply terminal 3 of the energy storage battery group 8 is electrically connected to the anode of the diode 14, and the cathode of the diode 14 is electrically connected to the output terminal of the rectifier 11 and the input terminal of the power supply inverter 4. When the electrical connection between the mains 2 and the input terminal of the rectifier 11 is disconnected, or the voltage at the input terminal of the rectifier 11 is 0, the output terminal voltage of the rectifier 11 is 0, and the voltage U1 at the cathode of the diode 14 is also 0. The voltage U2 at the anode of the diode 14 is the voltage of the energy storage battery group 8. At this time, the voltage difference between the anode of the diode 14 and the cathode of the diode 14 is greater than the conduction voltage, the diode 14 is turned on, and the energy storage battery group 8 is electrically connected to the input terminal of the power supply inverter 4.

[0065] The energy storage battery group 8 outputs AC power, and the power supply inverter 4 converts the AC power into DC power, and then provides the DC power to the load 5 to drive the load 5 to operate. During the discharge process of the energy storage battery group 8, the energy storage inverter 9 electrically connected to the power supply end 3 of the energy storage battery group 8 does not work, and the mains 2 at the input end of the energy storage inverter 9 is disconnected from the energy storage battery group 8.

[0066] The static switch 15 is a contactless switch, which is composed of a thyristor switch device. The switching time of a fast thyristor is in the microsecond level, which is only about one thousandth of the switching time of a small relay compared to the millisecond level of the switching time of a small relay.

[0067] A static bypass switch 7 is provided between the static switch 15 and the mains 2. When the static bypass switch 7, the static switch 15 and the main charging switch 13 are all closed, the mains 2 is electrically connected to the load 5 to supply power to the load 5. The branch where the static switch 15 is located is connected in parallel with the maintenance bypass 6. When the uninterruptible power supply system is overloaded, short-circuited and / or the power supply inverter 4 fails, the static switch 15 is closed to electrically connect the mains 2 to the load 5 to prevent the circuit structure of the uninterruptible power supply system from being damaged and causing the power supply to the load 5 to be terminated. In combination with the branch where the static switch 15 is located and the maintenance bypass 6, it can be ensured that the load 5 is supplied with power without interruption.

[0068] In this embodiment, a diode 14 is provided between the energy storage battery group 8 and the rectifier 11, the anode of the diode 14 is electrically connected to the power supply end 3 of the energy storage battery group 8, and the cathode of the diode 14 is electrically connected to the output end of the rectifier 11. The uninterruptible power supply system also includes a static switch 15, the first end of the static switch 15 is electrically connected to the mains 2, and the second end of the static switch 15 is electrically connected to the output end of the power supply inverter 4. The branch where the static switch 15 is located is connected in parallel with the maintenance bypass 6. When the uninterruptible power supply system is overloaded, short-circuited and / or the power supply inverter 4 fails, the static switch 15 is closed so that the mains 2 is electrically connected to the load 5 to prevent the circuit structure of the uninterruptible power supply system from being damaged and causing the power supply to the load 5 to be terminated. In combination with the branch where the static switch 15 is located and the maintenance bypass 6, it can be ensured that the load 5 is powered uninterruptedly.

[0069] Example 5

[0070] like Figure 1-Figure 2 As shown, this embodiment provides an uninterruptible power supply system, including an energy storage module 1, a mains power 2 electrically connected to a power supply end 3 of the energy storage module 1, and the power supply end 3 of the energy storage module 1 is electrically connected to a load 5 through a power supply inverter 4; a maintenance bypass 6 is also provided between the mains power 2 and the load 5, and the maintenance bypass 6 includes a bypass switch 7; the bypass switch 7 is closed when the energy storage module 1 is inspected, so that the mains power 2 supplies power to the load 5.

[0071] The energy storage module 1 includes an energy storage battery group 8 and an energy storage inverter 9 . The energy storage battery group 8 is electrically connected to the output end of the energy storage inverter 9 , and the input end of the energy storage inverter 9 is electrically connected to the mains 2 .

[0072] The uninterruptible power supply system also includes an energy management module 16 and a battery management module 17, the energy management module 16 is electrically connected to the energy storage inverter 9, and the battery management module 17 is electrically connected to the energy storage battery group 8; the energy management module 16 is used to control the charging and discharging of the energy storage battery group 8, and the energy storage battery group 8 is used to monitor the working status of the energy storage battery group 8.

[0073] The energy management module 16 is used to monitor, manage and control the entire uninterruptible power supply system, including formulating charging and discharging strategies, and executing charging and discharging strategies. The energy management module 16 is also used to coordinate the uninterruptible power supply system of the present invention to operate together with other power equipment.

[0074] The battery management module 17 is used to detect the working status of the energy storage battery pack 8. The working status of the energy storage battery pack 8 includes parameters such as voltage, current and temperature of the energy storage battery pack 8 to ensure safe operation and efficient use of the energy storage battery pack 8.

[0075] When the mains 2 is supplying power normally, the mains 2 supplies power to the load 5 and charges the energy storage battery 8. When the mains 2 is interrupted, the energy storage battery 8 supplies power to the load 5 through the power inverter 4, thereby providing uninterrupted power supply to the load 5.

[0076] Preferably, the battery management module 17 collects the overall operating parameters of the energy storage battery group 8 and the operating parameters of each energy storage battery in the energy storage battery group 8. When the energy storage battery group 8 as a whole fails, or one or more energy storage batteries in the energy storage battery group 8 fail, the failure of the energy storage battery group 8 or several energy storage batteries can be discovered in time by combining the overall operating parameters of the energy storage battery group 8 and the operating parameters of each energy storage battery, the energy storage battery group 8 can be disconnected from the uninterruptible power supply system, and the energy storage batteries can be replaced.

[0077] The present invention combines an uninterruptible power supply system and an energy storage module 1, and does not need to set up a large number of backup batteries. The present invention reduces the cost of battery manufacturing, and can achieve anti-power shaking and peak-shaving and valley-filling power supply.

[0078] Preferably, the input end of the energy storage inverter 9 can be connected to a solar power generation device or a wind power generation device to achieve green and low-carbon electricity supply.

[0079] The energy management module 16 is electrically connected to the energy storage inverter 9, and the energy management module 16 controls the energy storage inverter 9 to start or stop, so that the AC power 2 charges the energy storage battery group 8 through the energy storage inverter 9, or disconnects the AC power 2 from the energy storage battery group 8, and the energy storage battery group 8 discharges to the load 5 through the power supply inverter 4.

[0080] The energy management module 16 is electrically connected to the battery management module 17 . The battery management module 17 sends the collected voltage, current and power of the energy storage battery group 8 to the energy management module 16 . The energy management module 16 controls the battery management module 17 to monitor the working status of the energy storage battery group 8 .

[0081] The battery management module 17 is electrically connected to the energy storage battery group 8 , and the energy storage battery group 8 sends the collected voltage, current and power of the energy storage battery group 8 to the battery management module 17 , and the battery management module 17 controls the energy storage battery group 8 to charge and discharge.

[0082] The control flow chart of the uninterruptible power supply system of the present invention is as follows: Figure 3 As shown, the control method of the uninterruptible power supply system includes:

[0083] S1: Start the energy management module and the battery management module.

[0084] S2: Determine a power supply mode for supplying power to the load, where the power supply modes include normal mains power supply, energy storage battery pack power supply, and maintenance power supply.

[0085] S3: If the power supply mode is powered by the energy storage battery pack, the rectifier switch is disconnected, the main charging switch is closed, and the energy storage inverter is started.

[0086] S4: If the power supply mode is normal AC power supply, close the rectifier switch and the main charging switch.

[0087] S5: If the power supply mode is maintenance power supply, close the bypass switch, disconnect the rectifier switch, and turn off the energy storage inverter.

[0088] Step S3, step S4 and step S5 are parallel steps. After the uninterruptible power supply system is started, steps S1-S2 are first executed, and then one of steps S3-S5 is executed.

[0089] The uninterruptible power supply system of this embodiment also includes an energy management module 16 and a battery management module 17. The energy management module 16 is electrically connected to the energy storage inverter 9, and the battery management module 17 is electrically connected to the energy storage battery group 8. The energy management module 16 is used to control the charging and discharging of the energy storage battery group 8, and the energy storage battery group 8 is used to monitor the working state of the energy storage battery group 8. The battery management module 17 is used to detect the working state of the energy storage battery group 8. The working state of the energy storage battery group 8 includes parameters such as the voltage, current and temperature of the energy storage battery group 8 to ensure the safe operation and efficient use of the energy storage battery group 8. When the mains 2 is supplying power normally, the mains 2 supplies power to the load 5 and charges the energy storage battery group 8 at the same time. When the mains 2 is interrupted, the energy storage battery group 8 supplies power to the load 5 through the power supply inverter 4, thereby providing an uninterrupted power supply to the load 5.

[0090] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the application. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a restriction. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in the subsequent accompanying drawings.

[0091] It should be understood that spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would then be positioned "below" or "below" the other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used herein should be interpreted accordingly.

[0092] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0093] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An uninterruptible power supply system, characterized in that: It includes an energy storage module, the mains is electrically connected to the power supply end of the energy storage module, and the power supply end of the energy storage module is electrically connected to the load through a power supply inverter; a maintenance bypass is also provided between the mains and the load, and the maintenance bypass includes a bypass switch; the bypass switch is closed when the energy storage module is inspected to enable the mains to supply power to the load.

2. The uninterruptible power supply system according to claim 1, characterized in that: The energy storage module includes an energy storage battery group and an energy storage inverter. The energy storage battery group is electrically connected to the output end of the energy storage inverter, and the input end of the energy storage inverter is electrically connected to the mains.

3. The uninterruptible power supply system according to claim 2, characterized in that: It also includes a rectifier module, the input end of the rectifier module is electrically connected to the mains, and the output end of the rectifier module is electrically connected to the load.

4. The uninterruptible power supply system according to claim 3, characterized in that: The rectifier module includes a rectifier and a power supply inverter, the input end of the rectifier is electrically connected to the mains, the output end of the rectifier is electrically connected to the input end of the power supply inverter, and the output end of the power supply inverter is electrically connected to the load.

5. The uninterruptible power supply system according to claim 4, characterized in that: A rectifier switch is provided between the rectifier and the mains power.

6. The uninterruptible power supply system according to claim 4, characterized in that: A main charging switch is provided between the power supply inverter and the load.

7. The uninterruptible power supply system according to claim 4, characterized in that: The power supply end of the energy storage battery group is electrically connected to the output end of the rectifier.

8. The uninterruptible power supply system according to claim 7, characterized in that: A diode is provided between the energy storage battery pack and the rectifier, the anode of the diode is electrically connected to the power supply end of the energy storage battery pack, and the cathode of the diode is electrically connected to the output end of the rectifier.

9. The uninterruptible power supply system according to claim 4, characterized in that: It also includes a static switch, a first end of the static switch is electrically connected to the mains, and a second end of the static switch is electrically connected to the output end of the power supply inverter.

10. The uninterruptible power supply system according to claim 2, characterized in that: It also includes an energy management module and a battery management module, the energy management module is electrically connected to the energy storage inverter, and the battery management module is electrically connected to the energy storage battery pack; the energy management module is used to control the charging and discharging of the energy storage battery pack, and the energy storage battery pack is used to monitor the working status of the energy storage battery pack.

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