An uninterruptible power supply system and its control method

Abstract

The present invention discloses an uninterruptible power supply system and a control method thereof. The uninterruptible power supply system includes: a standby generator assembly, a dual-power switching device, an uninterruptible power supply energy storage device, a monitoring circuit, an uninterruptible power supply control device, and a central processing module. When the mains power is abnormal, the present invention uses the generator assembly to supply power to the uninterruptible power supply energy storage device, with a long power supply duration and no need to connect to a strong power grid, overcoming the technical defect of large power loss in the strong power grid power supply environment.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply for IT devices, and particularly to an uninterruptible power supply system and a control method thereof. Background Art

[0002] With the development of the IT industry in recent years, the requirement for uninterrupted power supply has been increasing day by day. For an uninterruptible power supply system (UPS) applied to a high-density data center, it not only needs to supply power to IT devices, but also needs to ensure power supply to auxiliary devices such as air conditioners for the operation of IT devices, and the power demand will continue to increase. In the traditional power supply mode of data centers, an online UPS power supply based on double conversion technology is generally adopted. The main disadvantage of this online UPS is that the power loss is large in a strong power grid power supply environment, the operation cost is high and the continuous time is short, and there may be a power failure risk when the mains power fails for a long time. Therefore, an intelligent new type of uninterruptible power supply system with low energy consumption and long sustainable time is needed. Summary of the Invention

[0003] The purpose of the present invention is to provide an uninterruptible power supply system and a control method thereof, so as to provide an uninterruptible power supply system with low energy consumption and long sustainable time.

[0004] To achieve the above purpose, the present invention provides the following solutions:

[0005] An uninterruptible power supply system, the uninterruptible power supply system includes:

[0006] A standby generator assembly, a dual-power switching device, an uninterruptible power supply energy storage device, a monitoring circuit, an uninterruptible power supply control device, and a central processing module;

[0007] The first input end of the dual-power switching device is connected to the mains power; the second input end of the dual-power switching device is connected to the standby generator assembly, the output end of the dual-power switching device is connected to the power input end of the uninterruptible power supply energy storage device, and the power output end of the uninterruptible power supply energy storage device is connected to the load;

[0008] The output end of the monitoring circuit is connected to the central processing module, and the monitoring circuit is used for monitoring whether the mains power is normal and sending the detection result to the central processing module;

[0009] The central processing module is connected to the control end of the dual-power switching device, and the central processing module is used for controlling the connection between the first input end of the dual-power switching device and the output end of the dual-power switching device when the detection result is that the mains power is normal;

[0010] The output end of the uninterruptible power supply control device is connected to the central processing module. The uninterruptible power supply control device is used to monitor the energy storage state of the uninterruptible power supply energy storage device. When the energy storage state value of the uninterruptible power supply energy storage device is lower than the lowest energy storage threshold, it sends a power shortage signal of the energy storage device to the central processing module;

[0011] The central processing module is connected to the control end of the standby generator assembly. The central processing module is used to control the second input end of the dual power supply switching device to be connected to the output end of the dual power supply switching device and control the standby generator assembly to generate electricity when it receives the power shortage signal of the energy storage device and the detection result is that the commercial power is abnormal.

[0012] Optionally, the uninterruptible power supply energy storage device includes an input switch, a plurality of uninterruptible power supplies, and an output switch;

[0013] The input end of the input switch is connected to the output end of the dual power supply switching device. The multiple output ends of the input switch are respectively connected to the power input ends of the plurality of uninterruptible power supplies. The power output ends of the plurality of uninterruptible power supplies are respectively connected to the multiple input ends of the output switch. The output end of the output switch is connected to the load;

[0014] The control end of the input switch and the control end of the output switch are respectively connected to the uninterruptible power supply control device;

[0015] The uninterruptible power supply control device is used to monitor the energy storage states of the plurality of uninterruptible power supplies, and control the input switch according to the energy storage state of each uninterruptible power supply to connect the power input end of the uninterruptible power supply with an energy storage state value lower than the lowest energy storage threshold to the output end of the dual power supply switching device, and control the output switch to connect the power output end of the uninterruptible power supply that meets the power output condition to the load.

[0016] Optionally, the uninterruptible power supply energy storage device further includes a maintenance switch. One end of the maintenance switch is connected to the input end of the input switch, and the other end of the maintenance switch is connected to the output end of the output switch.

[0017] Optionally, the number of the uninterruptible power supplies is three.

[0018] Optionally, the standby generator assembly includes a plurality of standby generator sets and a standby generator control system;

[0019] The standby generator control system is respectively connected to the central processing module and the control ends of the plurality of standby generator sets. The output ends of the plurality of standby generator sets are all connected to the second input end of the dual power supply switching device.

[0020] Optionally, the number of the standby generator sets is two.

[0021] A control method for an uninterruptible power supply system, the control method comprising the following steps:

[0022] Monitoring whether the mains power is normal through a monitoring circuit to obtain a detection result;

[0023] When the detection result is that the mains power is normal, the central processing module controls the first input end of the dual power supply switching device to be connected to the output end of the dual power supply switching device, and uses the mains power to supply power to the uninterruptible power supply energy storage device;

[0024] The uninterruptible power supply control device monitors the energy storage state of the uninterruptible power supply energy storage device. When the energy storage state value of the uninterruptible power supply energy storage device is lower than the lowest energy storage threshold, an energy storage device power shortage signal is sent to the central processing module;

[0025] When the central processing module receives the energy storage device power shortage signal and the detection result is that the mains power is abnormal, it controls the second input end of the dual power supply switching device to be connected to the output end of the dual power supply switching device, uses the standby generator assembly to supply power to the uninterruptible power supply energy storage device, and controls the standby generator assembly to generate electricity.

[0026] Optionally, when the detection result is that the mains power is normal, the central processing module controls the first input end of the dual power supply switching device to be connected to the output end of the dual power supply switching device, and uses the mains power to supply power to the uninterruptible power supply energy storage device; when the detection result is that the mains power is abnormal, it controls the second input end of the dual power supply switching device to be connected to the output end of the dual power supply switching device, and uses the standby generator assembly to supply power to the uninterruptible power supply energy storage device. After that, it further includes:

[0027] The uninterruptible power supply control device monitors the energy storage states of multiple said uninterruptible power supplies;

[0028] According to the energy storage state of each uninterruptible power supply, the input switch is controlled to connect the power input end of the uninterruptible power supply with an energy storage state value lower than the lowest energy storage threshold to the output end of the dual power supply switching device to charge the uninterruptible power supply with an energy storage state value lower than the lowest energy storage threshold;

[0029] The output switch is controlled to connect the power output end of the uninterruptible power supply that meets the power output condition to the load to supply power to the load.

[0030] According to the specific embodiments provided by the present invention, the following technical effects are disclosed by the present invention:

[0031] The present invention discloses an uninterruptible power supply system and a control method thereof. The uninterruptible power supply system includes: a standby generator assembly, a dual-power switching device, an uninterruptible power supply energy storage device, a monitoring circuit, an uninterruptible power supply control device, and a central processing module; a first input end of the dual-power switching device is connected to the commercial power; a second input end of the dual-power switching device is connected to the standby generator assembly, an output end of the dual-power switching device is connected to a power input end of the uninterruptible power supply energy storage device, a power output end of the uninterruptible power supply energy storage device is connected to a load; an output end of the monitoring circuit is connected to the central processing module; the central processing module is connected to a control end of the dual-power switching device; an output end of the uninterruptible power supply control device is connected to the central processing module; the central processing module is connected to a control end of the standby generator assembly. When the commercial power is abnormal, the present invention uses the generator assembly to supply power to the uninterruptible power supply energy storage device, with a long power supply duration and without the need to connect to a strong power grid, overcoming the technical defect of large power loss in the strong power grid power supply environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the following-described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0033] Figure 1 It is a structural diagram of an uninterruptible power supply system provided by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] The object of the present invention is to provide an uninterruptible power supply system and a control method thereof to provide an uninterruptible power supply system with low energy consumption and long sustainable time.

[0035] In order to make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0036] Such as Figure 1As shown in the figure, the present invention provides an uninterruptible power supply system, which includes: a standby generator assembly, a dual power supply switching device, an uninterruptible power supply energy storage device, a monitoring circuit, an uninterruptible power supply control device, and a central processing module; the first input end of the dual power supply switching device is connected to the commercial power; the second input end of the dual power supply switching device is connected to the standby generator assembly, the output end of the dual power supply switching device is connected to the power input end of the uninterruptible power supply energy storage device, and the power output end of the uninterruptible power supply energy storage device is connected to the load; the output end of the monitoring circuit is connected to the central processing module, and the monitoring circuit is used to monitor whether the commercial power is normal and send the detection result to the central processing module; the central processing module is connected to the control end of the dual power supply switching device, and the central processing module is used to control the connection between the first input end of the dual power supply switching device and the output end of the dual power supply switching device when the detection result is that the commercial power is normal; the output end of the uninterruptible power supply control device is connected to the central processing module, and the uninterruptible power supply control device is used to monitor the energy storage state of the uninterruptible power supply energy storage device. When the energy storage state value of the uninterruptible power supply energy storage device is lower than the lowest energy storage threshold, an energy storage device power shortage signal is sent to the central processing module; the central processing module is connected to the control end of the standby generator assembly, and the central processing module is used to control the connection between the second input end of the dual power supply switching device and the output end of the dual power supply switching device and control the standby generator assembly to generate electricity when receiving the energy storage device power shortage signal and the detection result is that the commercial power is abnormal.

[0037] Among them, the uninterruptible power supply energy storage device includes an input switch, a plurality of uninterruptible power supplies, and an output switch; the input end of the input switch is connected to the output end of the dual power supply switching device, the plurality of output ends of the input switch are respectively connected to the power input ends of the plurality of uninterruptible power supplies, the power output ends of the plurality of uninterruptible power supplies are respectively connected to the plurality of input ends of the output switch, and the output end of the output switch is connected to the load; the control ends of the input switch and the output switch are respectively connected to the uninterruptible power supply control device; the uninterruptible power supply control device is used to monitor the energy storage states of the plurality of uninterruptible power supplies and control the input switch according to the energy storage state of each uninterruptible power supply to connect the power input end of the uninterruptible power supply with an energy storage state value lower than the lowest energy storage threshold to the output end of the dual power supply switching device, and control the output switch to connect the power output end of the uninterruptible power supply that meets the power output condition to the load. The uninterruptible power supply of the present invention adopts the fourth-generation modular high-frequency uninterruptible power supply and can be hot-plugged for maintenance.

[0038] The uninterruptible power supply energy storage device further includes a maintenance switch, one end of the maintenance switch is connected to the input end of the input switch, and the other end of the maintenance switch is connected to the output end of the output switch.

[0039] The number of the uninterruptible power supplies is three, namely Figure 1 the uninterruptible power supply A, the uninterruptible power supply B and the uninterruptible power supply C in

[0040] The standby generator set assembly includes a plurality of standby generator sets and a standby generator control system; the standby generator control system is respectively connected to the central processing module and the control ends of the plurality of standby generator sets, and the output ends of the plurality of standby generator sets are all connected to the second input end of the dual-power switching device.

[0041] The number of the standby generator sets is two, namely Figure 1 the standby generator set A and the standby generator set B in

[0042] Each component of the present invention is connected by a cable.

[0043] The working principle of the uninterruptible power supply system of the present invention is as follows:

[0044] When the commercial power works normally, the dual-power switching device uses the commercial power for power supply, and the load obtains power normally; when the monitoring circuit monitors that the commercial power is abnormal, through the feedback of the central processing module and the uninterruptible power supply control device, the uninterruptible power supply energy storage device is enabled to continue to supply power to the load. At the same time, to prevent the uninterruptible power supply energy storage device from running out of power due to the long-term abnormality of the commercial power, the dual-power switching device switches to the standby generator set for power supply, and the standby generator set supplies power to the uninterruptible power supply energy storage device in an emergency.

[0045] The standby generator sets and the uninterruptible power supplies of the present invention are all plural (multiple) to prevent the inability to work when a single unit fails.

[0046] The uninterruptible power supply system of the present invention has stable power supply, can work for a long time, can be intelligently switched in dual modes, and is equipped with a maintenance circuit for hot pluggable maintenance and maintenance through the maintenance circuit.

[0047] The present invention also provides a control method for an uninterruptible power supply system, and the control method includes the following steps:

[0048] Monitor whether the commercial power is normal through the monitoring circuit to obtain a detection result.

[0049] When the detection result is that the commercial power is normal through the central processing module, control the first input end of the dual-power switching device to be connected to the output end of the dual-power switching device, and use the commercial power to supply power to the uninterruptible power supply energy storage device.

[0050] Monitor the energy storage state of the uninterruptible power supply energy storage device through the uninterruptible power supply control device. When the energy storage state value of the uninterruptible power supply energy storage device is lower than the lowest energy storage threshold, send a power shortage signal of the energy storage device to the central processing module.

[0051] When the central processing module receives a power shortage signal from the energy storage device and the detection result indicates that the mains power is abnormal, it controls the second input terminal of the dual-power switching device to be connected to the output terminal of the dual-power switching device, uses the standby generator assembly to supply power to the uninterruptible power supply energy storage device, and controls the standby generator assembly to generate electricity.

[0052] Among them, when the detection result indicates that the mains power is normal, the central processing module controls the first input terminal of the dual-power switching device to be connected to the output terminal of the dual-power switching device, and uses the mains power to supply power to the uninterruptible power supply energy storage device; when the detection result indicates that the mains power is abnormal, the central processing module controls the second input terminal of the dual-power switching device to be connected to the output terminal of the dual-power switching device, and uses the standby generator assembly to supply power to the uninterruptible power supply energy storage device. After that, it further includes:

[0053] The uninterruptible power supply control device monitors the energy storage status of multiple uninterruptible power supplies; according to the energy storage status of each uninterruptible power supply, it controls the input switch to connect the power input terminal of the uninterruptible power supply with an energy storage status value lower than the lowest energy storage threshold to the output terminal of the dual-power switching device to charge the uninterruptible power supply with an energy storage status value lower than the lowest energy storage threshold; it controls the output switch to connect the power output terminal of the uninterruptible power supply that meets the power output condition to the load to supply power to the load.

[0054] The working principle process of the control method of the uninterruptible power supply system of the present invention is as follows:

[0055] S1. Determine whether the voltage of the mains power is normal through the monitoring circuit. If it is normal, do not start the standby generator assembly and the uninterruptible power supply energy storage device;

[0056] S2. If the monitoring circuit determines that the mains power is abnormal, it transmits a signal to the central processing module. The central processing module coordinates to start the uninterruptible power supply energy storage device to maintain normal power supply to the load. The uninterruptible power supply control device monitors the remaining power of the uninterruptible power supply energy storage device. If the power is insufficient, proceed to the next step;

[0057] S3. If the uninterruptible power supply control device determines that the power of the uninterruptible power supply energy storage device is insufficient, it starts the standby generator set through the coordinated standby generator set control system to supply power to the uninterruptible power supply energy storage device;

[0058] S4. If the monitoring circuit monitors that the mains power has returned to normal, the dual-power switching device switches back to mains power supply, the system resumes to mains power supply, and the standby generator set is shut down.

[0059] In order to illustrate the technical effects of the uninterruptible power supply system and its control method of the present invention, the following specific embodiments are provided:

[0060] A set of uninterruptible power supply system described in this article is set up in a data center. Two uninterruptible power supplies (UPS) with 380V and 600kVA are used. The energy storage module of each UPS can supply power for 15 minutes. The standby generator set uses three 6-cylinder diesel generator sets with a single power of 625KVA. In addition, it also includes a monitoring circuit, a double power supply switching device, an input switch, a maintenance switch, an output switch, a standby generator control system, a central processing module, and a fourth-generation modular high-frequency uninterruptible power supply control system.

[0061] When the mains power is working normally, the double power supply switching device uses the mains power to supply power, and the load obtains power normally; when the monitoring circuit detects an abnormality in the mains power, through the feedback of the central processing module and the uninterruptible power supply control device, the uninterruptible power supply is enabled to continue to supply power to the load. At the same time, to prevent the energy storage module of the uninterruptible power supply from running out of power due to long-term abnormality of the mains power, after the power reserve reaches the warning level, the double power supply switching device switches to the standby generator set to supply power. The IT equipment, air conditioners for auxiliary cooling, lighting, etc. in the computer room work normally and stably. The dual-mode switching process is smooth and rapid, and there are no situations such as power outages or voltage instability.

[0062] The energy storage module of the uninterruptible power supply is replaced by hot plugging. The entire system still works stably and supplies power normally. Through the coordinated control of the input switch, output switch, and maintenance switch, maintenance is carried out through the maintenance circuit, and the power supply of the system is still stable and smooth. Subsequently, the mains power supply is restored, the standby generator set stops working, and the system returns to the normal working state.

[0063] The uninterruptible power supply system and its control method of the present invention have at least the following beneficial effects:

[0064] (1) The present invention uses a plurality of standby generator sets and a plurality of uninterruptible power supplies to prevent the entire system from failing when a single module fails, improving the stability of the entire system.

[0065] (2) The present invention realizes the intelligent switching of the dual power supply mode through the monitoring circuit, double power supply switching device, standby generator control system, uninterruptible power supply control device, and central processing module intelligent control circuit. The power supply of the standby generator set and the mains power supply are seamlessly connected, making the power supply stable.

[0066] (3) The uninterruptible power supply of the present invention uses a fourth-generation modular high-frequency uninterruptible power supply. The modular design allows for direct hot plugging maintenance and replacement, increasing the fault tolerance rate of the entire system; at the same time, in an emergency, maintenance can also be carried out through the coordinated control of the input switch, output switch, and maintenance switch through the maintenance circuit.

[0067] In this specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other.

[0068] Specific examples are used in this article to elaborate on the principles and implementation manners of the invention. The descriptions of the above embodiments are only for helping to understand the method of the present invention and its core idea. The described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

Claims

1. An uninterruptible power supply system, characterized in that, The uninterruptible power supply system includes: A standby generator assembly, a dual power supply switching device, an uninterruptible power supply energy storage device, a monitoring circuit, an uninterruptible power supply control device, and a central processing module; The first input end of the dual power supply switching device is connected to the commercial power; the second input end of the dual power supply switching device is connected to the standby generator assembly, the output end of the dual power supply switching device is connected to the power input end of the uninterruptible power supply energy storage device, and the power output end of the uninterruptible power supply energy storage device is connected to the load; The output end of the monitoring circuit is connected to the central processing module, and the monitoring circuit is used to monitor whether the commercial power is normal and send the detection result to the central processing module; The central processing module is connected to the control end of the dual power supply switching device. When the detection result shows that the commercial power is normal, the central processing module is used to control the connection between the first input end of the dual power supply switching device and the output end of the dual power supply switching device; The output end of the uninterruptible power supply control device is connected to the central processing module. The uninterruptible power supply control device is used to monitor the energy storage state of the uninterruptible power supply energy storage device. When the energy storage state value of the uninterruptible power supply energy storage device is lower than the lowest energy storage threshold, it sends a power shortage signal of the energy storage device to the central processing module; The central processing module is connected to the control end of the standby generator assembly. When receiving the power shortage signal of the energy storage device and the detection result shows that the commercial power is abnormal, the central processing module is used to control the connection between the second input end of the dual power supply switching device and the output end of the dual power supply switching device, and control the standby generator assembly to generate electricity; The uninterruptible power supply energy storage device includes an input switch, a plurality of uninterruptible power supplies, and an output switch; The input end of the input switch is connected to the output end of the dual power supply switching device. The multiple output ends of the input switch are respectively connected to the power input ends of the plurality of uninterruptible power supplies. The power output ends of the plurality of uninterruptible power supplies are respectively connected to the multiple input ends of the output switch, and the output end of the output switch is connected to the load; The control end of the input switch and the control end of the output switch are respectively connected to the uninterruptible power supply control device; The uninterruptible power supply control device is used to monitor the energy storage states of the plurality of uninterruptible power supplies, and control the input switch according to the energy storage state of each uninterruptible power supply to connect the power input end of the uninterruptible power supply with an energy storage state value lower than the lowest energy storage threshold to the output end of the dual power supply switching device, and control the output switch to connect the power output end of the uninterruptible power supply that meets the power output condition to the load.

2. The uninterruptible power supply system according to claim 1, characterized in that, The uninterruptible power supply energy storage device further includes a maintenance switch. One end of the maintenance switch is connected to the input end of the input switch, and the other end of the maintenance switch is connected to the output end of the output switch.

3. The uninterruptible power supply system according to claim 1, characterized in that, The number of the uninterruptible power supplies is three.

4. The uninterruptible power supply system according to claim 1, characterized in that, The standby generator assembly includes a plurality of standby generator sets and a standby generator control system; The standby generator control system is respectively connected to the central processing module and the control ends of the plurality of standby generator sets. The output ends of the plurality of standby generator sets are all connected to the second input end of the dual power supply switching device.

5. The uninterruptible power supply system according to claim 1, characterized in that, The number of the standby generator sets is two.

6. A control method for an uninterruptible power supply system, characterized in that, The control method is applied to the uninterruptible power supply system according to any one of claims 1-5, and the control method includes the following steps: Monitor whether the commercial power is normal through a monitoring circuit to obtain a detection result; When the detection result is that the commercial power is normal through a central processing module, control the first input end of the dual-power switching device to be connected to the output end of the dual-power switching device, and use the commercial power to supply power to the uninterruptible power supply energy storage device; Monitor the energy storage state of the uninterruptible power supply energy storage device through the uninterruptible power supply control device. When the energy storage state value of the uninterruptible power supply energy storage device is lower than the lowest energy storage threshold, send a power shortage signal of the energy storage device to the central processing module; When receiving the power shortage signal of the energy storage device and the detection result is that the commercial power is abnormal through the central processing module, control the second input end of the dual-power switching device to be connected to the output end of the dual-power switching device, use the standby generator assembly to supply power to the uninterruptible power supply energy storage device, and control the standby generator assembly to generate electricity; When the detection result is that the commercial power is normal through the central processing module, control the first input end of the dual-power switching device to be connected to the output end of the dual-power switching device, and use the commercial power to supply power to the uninterruptible power supply energy storage device; when the detection result is that the commercial power is abnormal, control the second input end of the dual-power switching device to be connected to the output end of the dual-power switching device, and use the standby generator assembly to supply power to the uninterruptible power supply energy storage device. After that, it further includes: Monitor the energy storage states of the multiple uninterruptible power supplies through the uninterruptible power supply control device; Control the input switch according to the energy storage state of each uninterruptible power supply to connect the power input end of the uninterruptible power supply with an energy storage state value lower than the lowest energy storage threshold to the output end of the dual-power switching device to charge the uninterruptible power supply with an energy storage state value lower than the lowest energy storage threshold; Control the output switch to connect the power output end of the uninterruptible power supply that meets the power output condition to the load to supply power to the load.

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