CN110445247B - High-reliability redundant power supply system and method - Google Patents

Abstract

The invention discloses a high-reliability redundant power supply system and a method, which comprises the following steps: the UPS monitoring system comprises a first commercial power port, a second commercial power port, a switching module, a control module, a UPS standby machine unit, a first UPS common machine unit, a first load, a second UPS common machine unit, a second load, a monitoring module and a timing switch module; the first commercial power port and the second commercial power port are electrically connected with the switching module, the switching module is electrically connected with the control module and the UPS standby machine unit respectively, and the UPS standby machine unit is electrically connected with the first UPS common machine unit and the second UPS common machine unit; the monitoring module is used for monitoring the power supply state and the current operation parameters of the high-reliability redundant power supply system, and the timing switch module is used for performing timing on-off control on the UPS standby machine unit, the first UPS common machine unit and the second UPS. The invention has the advantages of good fault isolation function and high reliability.

Description

High-reliability redundant power supply system and method

Technical Field

The invention relates to the technical field of power supplies, in particular to a high-reliability redundant power supply system and a high-reliability redundant power supply method.

Background

In modern plants, the DCS system (i.e., distributed control system) is a very important system. The prior art DCS systems are all provided with a UPS (uninterruptible power supply). When the UPS is provided with commercial power, the AC power supply is rectified into a DC power supply, wherein part of energy is transmitted to the inverter to be converted into AC power to supply power to the DCS, and part of energy is used for charging the storage battery. When the commercial power is cut off, the energy stored in the storage battery is released and changed into alternating current through the inverter to supply power to the DCS.

The alternating current supplied to the DCS system by the online UPS is a regenerative alternating current output by the inverter. After the mains supply is rectified, inverted and filtered by the UPS, the fluctuation, the surge, the frequency drift, the harmonic distortion and various interferences of the mains supply are eliminated. However, although the UPS solves the problem of power failure of the utility power, it also causes the problem of the failure of the UPS itself. The application of the UPS to the chemical device does not completely solve the problem of power supply reliability.

Disclosure of Invention

The embodiment of the invention provides a high-reliability redundant power supply system and a method thereof, which are used for solving the problem of low reliability of a redundant power supply system in the prior art.

In a first aspect, an embodiment of the present invention provides a high-reliability redundant power supply system, including:

the UPS monitoring system comprises a first commercial power port, a second commercial power port, a switching module, a control module, a UPS standby machine unit, a first UPS common machine unit, a first load, a second UPS common machine unit, a second load, a monitoring module and a timing switch module; the first commercial power port is electrically connected with a first input end of the switching module, and the second commercial power port is electrically connected with a second input end of the switching module; the switching module is electrically connected with the control module; the output end of the switching module is electrically connected with a main power input end of the UPS standby machine unit, a first bypass power input end of the UPS standby machine unit, a main power input end of the first UPS common machine unit and a main power input end of the second UPS common machine unit respectively; the output end of the UPS standby machine unit is electrically connected with the first bypass power supply input end of the first UPS common machine unit and the first bypass power supply input end of the second UPS common machine unit respectively, the output end of the first UPS common machine unit is electrically connected with the first load, and the output end of the second UPS common machine unit is electrically connected with the second load; the monitoring module is used for monitoring the power supply state and the current operation parameters of the high-reliability redundant power supply system, and the timing switch module is used for controlling the timing switch of the UPS standby machine unit, the first UPS common machine unit and the second UPS common machine unit.

Preferably, the high-reliability redundant power supply system further includes:

the switching module is electrically connected with a second bypass power input end of the UPS standby machine unit, and an output end of the UPS standby machine unit is electrically connected with a second bypass power input end of the first UPS common machine unit and a second bypass power input end of the second UPS common machine unit respectively.

Preferably, the output power frequency of the UPS standby unit is equal to the first bypass power input frequency and the second bypass power input frequency of the UPS standby unit, the output power frequency of the first UPS normal use unit is equal to the first bypass power input frequency and the second bypass power input frequency of the first UPS normal use unit, and the output power frequency of the second UPS normal use unit is equal to the first bypass power input frequency and the second bypass power input frequency of the second UPS normal use unit.

Preferably, the monitoring module is connected to the UPS standby unit, the first UPS normal use unit, and the second UPS normal use unit through RS-485 buses.

Preferably, the first bypass power supply of the UPS standby machine unit is provided with a first bypass switch, the second bypass power supply of the UPS standby machine unit is provided with a second bypass switch, and the third bypass power supply of the UPS standby machine unit is provided with a third bypass switch.

Preferably, the first UPS common machine unit includes a first storage battery, a first rectifier, a first inverter, a first static switch, a first UPS common machine input switch, and a first UPS common machine output switch.

Preferably, the running state of the first UPS general-purpose machine unit includes a non-return mode and a straight-through mode; when the first UPS common machine unit is in a non-return mode, the first storage battery is in a standby state; the first storage battery is charged at the voltage when the first UPS utility unit is in the pass-through mode.

Preferably, the UPS standby machine unit, the second UPS normal machine unit 6 and the first UPS normal machine unit 7 are identical in structure.

In a second aspect, an embodiment of the present invention provides a high-reliability redundant power supply method, where the method includes:

acquiring a first mains voltage and a second mains voltage;

acquiring the voltage of the UPS standby machine unit according to the first commercial power voltage and the second commercial power voltage;

acquiring the voltage of the first UPS normal machine unit and the voltage of the second UPS normal machine unit according to the first commercial power voltage and the second commercial power voltage, and monitoring the voltages in real time;

when any one of the main power input end of the first UPS normal use machine unit and the main power input end of the second UPS normal use machine unit is abnormal, the corresponding bypass power input end is switched to supply power;

when the main power supply input end of the UPS standby machine unit is abnormal, switching a first bypass power supply or a second bypass power supply of the UPS standby machine unit to supply power to the first UPS normal machine unit and the second UPS normal machine unit;

when the main power input end of the UPS standby machine unit, the main power input end of the first UPS common machine unit and the main power input end of the second UPS common machine unit all have faults, supplying power through the first mains voltage or the second mains voltage;

when the first mains voltage is abnormal, the switching module automatically switches to the second mains voltage, and power is supplied through the storage battery in the switching process.

In summary, the high-reliability redundant power supply system and method provided in the embodiments of the present invention include: the UPS monitoring system comprises a first commercial power port, a second commercial power port, a switching module, a control module, a UPS standby machine unit, a first UPS common machine unit, a first load, a second UPS common machine unit, a second load, a monitoring module and a timing switch module; the first commercial power port is electrically connected with a first input end of the switching module, and the second commercial power port is electrically connected with a second input end of the switching module; the switching module is electrically connected with the control module; the output end of the switching module is electrically connected with a main power input end of the UPS standby machine unit, a first bypass power input end of the UPS standby machine unit, a main power input end of the first UPS common machine unit and a main power input end of the second UPS common machine unit respectively; the output of UPS standby machine unit respectively with the first bypass power input of first UPS machine unit commonly used reaches the first bypass power input of second UPS machine unit commonly used electricity is connected, the output of first UPS machine unit commonly used with first load electricity is connected, the output of second UPS machine unit commonly used with the second load electricity is connected. Therefore, when any one of the main power input end of the first UPS normal machine unit and the main power input end of the second UPS normal machine unit is abnormal, the corresponding bypass power input end is switched to supply power; when the main power supply input end of the UPS standby machine unit is abnormal, switching a first bypass power supply or a second bypass power supply of the UPS standby machine unit to supply power to the first UPS normal machine unit and the second UPS normal machine unit; and when the main power input end of the UPS standby machine unit, the main power input end of the first UPS common machine unit and the main power input end of the second UPS common machine unit all have faults, the power is supplied by the first mains voltage or the second mains voltage. The monitoring module is used for monitoring the power supply state and the current operation parameters of the high-reliability redundant power supply system, and the timing switch module is used for controlling the timing switch of the UPS standby machine unit, the first UPS common machine unit and the second UPS common machine unit. In addition, the output power ends of the UPS standby machine unit, the first UPS common machine unit and the second UPS common machine unit are mutually independent, so the invention has the advantages of good fault isolation function and high reliability.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of a high reliability redundant power supply system according to a preferred embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a high-reliability redundant power supply method according to another preferred embodiment of the present invention;

fig. 3 is a flow chart of a high reliability redundant power supply method according to a preferred embodiment of the present invention.

Detailed Description

Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Referring to fig. 1 and fig. 2, an embodiment of the invention provides a high-reliability redundant power supply system, including: the UPS monitoring system comprises a first commercial power port 1, a second commercial power port 2, a switching module 3, a control module 4, a UPS standby machine unit 5, a first UPS common machine unit 6, a first load, a second UPS common machine unit 7, a second load, a monitoring module 8 and a timing switch module 9; the first commercial power port 1 is electrically connected with a first input end of the switching module 3, and the second commercial power port 2 is electrically connected with a second input end of the switching module 3; the switching module 3 is electrically connected with the control module 4; the output end of the switching module 3 is electrically connected to the main power input end of the UPS standby unit 5, the first bypass power input end of the UPS standby unit 5, the main power input end of the first UPS normal use unit 6, and the main power input end of the second UPS normal use unit 7, respectively; the output of the UPS standby unit 5 is respectively connected to the first bypass power input of the first UPS common unit 6 and the first bypass power input of the second UPS common unit 7, the output of the first UPS common unit 6 is electrically connected to the first load, and the output of the second UPS common unit 7 is electrically connected to the second load. Therefore, when any one of the main power input end of the first UPS normal use machine unit 6 and the main power input end of the second UPS normal use machine unit 7 is abnormal, the corresponding bypass power input end is switched to supply power; when the main power input end of the UPS standby unit 5 is abnormal, switching the first bypass power supply or the second bypass power supply of the UPS standby unit 5 to supply power to the first UPS normal use unit 6 and the second UPS normal use unit 7; when the main power input end of the UPS standby machine unit 5, the main power input end of the first UPS normal machine unit 6 and the main power input end of the second UPS normal machine unit 7 all fail, power is supplied by the first mains voltage or the second mains voltage. The monitoring module 8 is used for monitoring the power supply state and the current operation parameters of the high-reliability redundant power supply system, and the timing switch module is used for controlling the timing switch of the UPS standby machine unit 5, the first UPS common machine unit 6 and the second UPS common machine unit 7. In addition, the output power ends of the UPS standby machine unit, the first UPS common machine unit and the second UPS common machine unit are mutually independent, so the invention has the advantages of good fault isolation function and high reliability.

Preferably, the high-reliability redundant power supply system further includes:

the switching module 3 is electrically connected to a second bypass power input terminal of the UPS standby unit 5, and an output terminal of the UPS standby unit 5 is electrically connected to a second bypass power input terminal of the first UPS common use unit 6 and a second bypass power input terminal of the second UPS common use unit 7, respectively. It can be understood that, in the present embodiment, the second bypass power input terminal of the UPS standby unit 5, the second bypass power input terminal of the first UPS normal use unit 6, and the second bypass power input terminal of the second UPS normal use unit 7 are used as backup power input terminals, and function when the main power input terminal is abnormal, so as to improve the reliability of the redundant power supply system.

Preferably, the high-reliability redundant power supply system further includes a third UPS general-purpose machine unit and a third load. The output end of the UPS standby machine unit is electrically connected with the third UPS common machine unit, and the third UPS common machine unit is electrically connected with the third load. It is understood that the number of UPS general-purpose machine units may be set according to the need, and is not limited in particular.

Preferably, the switching module 3 includes a first switch Q1 and a second switch Q2. The first switch Q1 is electrically connected to the first mains port 1, and the second switch Q2 is electrically connected to the second mains port 2. When the first commercial power or the second commercial power has power failure, the switching module 3 realizes automatic switching of the first commercial power or the second commercial power. The switching process includes a 1S blackout time. And in the 1 second, the UPS automatically and uninterruptedly switches to the storage battery power supply state, and after 1 second, the UPS automatically and uninterruptedly switches to the commercial power supply state.

Preferably, the output power frequency of the UPS standby unit 5 is equal to the first bypass power input frequency and the second bypass power input frequency of the UPS standby unit 5, the output power frequency of the first UPS general-purpose unit 6 is equal to the first bypass power input frequency and the second bypass power input frequency of the first UPS general-purpose unit 6, and the output power frequency of the second UPS general-purpose unit 7 is equal to the first bypass power input frequency and the second bypass power input frequency of the second UPS general-purpose unit 7. It can be understood that the first UPS general machine unit 6 and the second UPS general machine unit are synchronized with the first utility power and the second utility power. Therefore, the switching among the UPS standby machine unit 5, the first UPS normal machine unit 6 and the second UPS normal machine unit can realize uninterrupted switching, and has efficient operability.

Preferably, the monitoring module 4 is connected to the UPS standby unit 5, the first UPS normal use unit 6 and the second UPS normal use unit 7 through RS-485 buses, respectively. And the monitoring module monitors the power supply state, the current alarm state and the operation parameters of the UPS standby machine unit 5, the first UPS common machine unit 6 and the second UPS common machine unit in real time, and improves safety warning.

Preferably, the first bypass power supply of the UPS standby unit 5 is provided with a first bypass switch K1, the first bypass power supply of the UPS standby unit 5 is provided with a second bypass switch K2, and the second bypass power supply of the UPS standby unit is provided with a third bypass switch K3.

In another preferred embodiment the second bypass power supply of the UPS-standby unit 5 is provided with a fourth bypass switch K4, the second bypass power supply of the UPS-standby unit 5 is provided with a fifth bypass switch K5, and the second bypass power supply of the UPS-standby unit is provided with a sixth bypass switch K6. It can be understood that, in this embodiment, the first bypass switch, the second bypass switch, the third bypass switch, the fourth bypass switch, the fifth bypass switch and the sixth bypass switch provide a safe environment for the worker for the regular maintenance and repair of the high-reliability redundant power supply system according to the present invention.

Preferably, the first UPS common machine unit includes a first storage battery a1, a first rectifier D1, a first inverter N1, a first static switch Q3, a first UPS common machine input switch T1, and a first UPS common machine output switch T2.

Preferably, the running states of the first UPS general-purpose machine unit 6 include a non-return mode and a straight-through mode; when the first UPS general-use machine unit 6 is in the non-return mode, the first storage battery a1 is in a standby state; the first storage battery a1 is charged at the voltage when the first UPS general machine unit 6 is in the pass-through mode.

Specifically, when the first UPS normal use machine unit 6 is in the non-return mode, the first rectifier D1 and the first inverter N1 both operate, the first static switch connects the first inverter N1 to the first load, and the first storage battery is closed and in the standby state. When the UPS normal machine unit 6 is in the shoot-through mode, the first rectifier D1 and the first inverter N1 are both active, the first static switch connects the first inverter N1 to the first load and the first storage battery is charged at the bus voltage.

Specifically, when any one of the main power input end of the first UPS normal use machine unit 6 and the main power input end of the second UPS normal use machine unit 7 is abnormal, the corresponding bypass power input end is switched to supply power to the load;

when the main power input end of the UPS standby unit 5 is abnormal, switching the first bypass power supply or the second bypass power supply of the UPS standby unit 5 to supply power to the loads of the first UPS normal use unit 6 and the second UPS normal use unit 7;

when the main power input end of the UPS standby machine unit 5, the main power input end of the first UPS normal machine unit 6 and the main power input end of the second UPS normal machine unit 7 all fail, the load is powered by the first mains voltage or the second mains voltage.

Preferably, the UPS standby machine unit, the second UPS normal machine unit 6 and the first UPS normal machine unit 7 are identical in structure.

Example 2

Referring to fig. 3, an embodiment of the present invention provides a high-reliability redundant power supply method, including:

s1, acquiring a first mains voltage and a second mains voltage;

s2, obtaining the voltage of the UPS standby machine unit according to the first commercial power voltage and the second commercial power voltage;

s3, acquiring the voltage of the first UPS normal machine unit and the voltage of the second UPS normal machine unit according to the first commercial power voltage and the second commercial power voltage and monitoring the voltages in real time;

s4, when any one of the main power input end of the first UPS normal use machine unit and the main power input end of the second UPS normal use machine unit is abnormal, the corresponding bypass power input end is switched to supply power;

s5, when the main power input end of the UPS standby machine unit is abnormal, switching the first bypass power supply or the second bypass power supply of the UPS standby machine unit to supply power to the first UPS normal machine unit and the second UPS normal machine unit;

s6, when the main power input end of the UPS standby machine unit, the main power input end of the first UPS normal machine unit and the main power input end of the second UPS normal machine unit all have faults, supplying power through the first mains voltage or the second mains voltage;

and S7, when the first mains supply voltage is abnormal, the switching module automatically switches to the second mains supply voltage, and the power is supplied by the storage battery in the switching process.

In summary, the high-reliability redundant power supply system and method provided in the embodiments of the present invention include: the UPS monitoring system comprises a first commercial power port 1, a second commercial power port 2, a switching module 3, a control module 4, a UPS standby machine unit 5, a first UPS common machine unit 6, a first load, a second UPS common machine unit 7, a second load, a monitoring module 8 and a timing switch module 9; the first commercial power port 1 is electrically connected with a first input end of the switching module 3, and the second commercial power port 2 is electrically connected with a second input end of the switching module 3; the switching module 3 is electrically connected with the control module 4; the output end of the switching module 3 is electrically connected to the main power input end of the UPS standby unit 5, the first bypass power input end of the UPS standby unit 5, the main power input end of the first UPS normal use unit 6, and the main power input end of the second UPS normal use unit 7, respectively; the output of the UPS standby unit 5 is respectively connected to the first bypass power input of the first UPS common unit 6 and the first bypass power input of the second UPS common unit 7, the output of the first UPS common unit 6 is electrically connected to the first load, and the output of the second UPS common unit 7 is electrically connected to the second load. Therefore, when any one of the main power input end of the first UPS normal use machine unit 6 and the main power input end of the second UPS normal use machine unit 7 is abnormal, the corresponding bypass power input end is switched to supply power; when the main power input end of the UPS standby unit 5 is abnormal, switching the first bypass power supply or the second bypass power supply of the UPS standby unit 5 to supply power to the first UPS normal use unit 6 and the second UPS normal use unit 7; when the main power input end of the UPS standby machine unit 5, the main power input end of the first UPS normal machine unit 6 and the main power input end of the second UPS normal machine unit 7 all fail, power is supplied by the first mains voltage or the second mains voltage. The monitoring module 8 is used for monitoring the power supply state and the current operation parameters of the high-reliability redundant power supply system, and the timing switch module is used for controlling the timing switch of the UPS standby machine unit 5, the first UPS common machine unit 6 and the second UPS common machine unit 7. In addition, the output power ends of the UPS standby machine unit, the first UPS common machine unit and the second UPS common machine unit are mutually independent, so the invention has the advantages of good fault isolation function and high reliability.

It should also be noted that the exemplary embodiments mentioned in this patent describe some methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the above-described steps, that is, the steps may be performed in the order mentioned in the embodiments, may be performed in an order different from the order in the embodiments, or may be performed simultaneously.

As described above, only the specific embodiments of the present invention are provided, and it can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the system, the module and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again. It should be understood that the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present invention, and these modifications or substitutions should be covered within the scope of the present invention.

Claims (5)

1. A high reliability redundant power supply system, comprising: the UPS monitoring system comprises a first commercial power port, a second commercial power port, a switching module, a control module, a UPS standby machine unit, a first UPS common machine unit, a first load, a second UPS common machine unit, a second load, a monitoring module and a timing switch module; the first commercial power port is electrically connected with a first input end of the switching module, and the second commercial power port is electrically connected with a second input end of the switching module; the switching module is electrically connected with the control module; the output end of the switching module is electrically connected with a main power input end of the UPS standby machine unit, a first bypass power input end of the UPS standby machine unit, a main power input end of the first UPS common machine unit and a main power input end of the second UPS common machine unit respectively; the output end of the UPS standby machine unit is electrically connected with the first bypass power supply input end of the first UPS common machine unit and the first bypass power supply input end of the second UPS common machine unit respectively, the output end of the first UPS common machine unit is electrically connected with the first load, and the output end of the second UPS common machine unit is electrically connected with the second load; the monitoring module is used for monitoring the power supply state and the current operation parameters of the high-reliability redundant power supply system, and the timing switch module is used for performing timing switch control on the UPS standby machine unit, the first UPS normal machine unit and the second UPS normal machine unit;

the switching module is electrically connected with a second bypass power supply input end of the UPS standby machine unit, and an output end of the UPS standby machine unit is electrically connected with a second bypass power supply input end of the first UPS common machine unit and a second bypass power supply input end of the second UPS common machine unit respectively;

the output power frequency of the UPS standby machine unit is equal to the first bypass power input frequency and the second bypass power input frequency of the UPS standby machine unit, the output power frequency of the first UPS common machine unit is equal to the first bypass power input frequency and the second bypass power input frequency of the first UPS common machine unit, and the output power frequency of the second UPS common machine unit is equal to the first bypass power input frequency and the second bypass power input frequency of the second UPS common machine unit;

the monitoring module is respectively connected with the UPS standby machine unit, the first UPS common machine unit and the second UPS common machine unit through RS-485 buses;

the switching module comprises a first change-over switch and a second change-over switch, and the first change-over switch is electrically connected with the first commercial power port; the second change-over switch is electrically connected with the second commercial power port; when the first commercial power or the second commercial power is powered off, the switching module realizes automatic switching of the first commercial power or the second commercial power, the switching process comprises 1S power off time, the UPS is automatically and uninterruptedly switched to a storage battery power supply state within 1 second, and the UPS is automatically and uninterruptedly switched to the commercial power supply state after 1 second; the output power ends of the UPS standby machine unit, the first UPS common machine unit and the second UPS common machine unit are mutually independent.

2. The redundant power supply system according to claim 1, wherein the first UPS common machine unit comprises a first storage battery, a first rectifier, a first inverter, a first static switch, a first UPS common machine input switch, and a first UPS common machine output switch.

3. The redundant power supply system of claim 2, wherein the operational status of the first UPS utility unit includes a non-return mode and a pass-through mode; when the first UPS common machine unit is in a non-return mode, the first storage battery is in a standby state; the first storage battery is charged when the first UPS general machine unit is in a pass-through mode.

4. The redundant power supply system according to claim 3, wherein the UPS backup unit, the second UPS normal use unit and the first UPS normal use unit are identical in mechanism.

5. A high-reliability redundant power supply method, characterized in that the high-reliability redundant power supply system according to any one of claims 1 to 4, the method comprises:

acquiring a first mains voltage and a second mains voltage;

acquiring the voltage of the UPS standby machine unit according to the first commercial power voltage and the second commercial power voltage;

acquiring the voltage of the first UPS normal machine unit and the voltage of the second UPS normal machine unit according to the first commercial power voltage and the second commercial power voltage, and monitoring the voltages in real time;

when any one of the main power input end of the first UPS normal use machine unit and the main power input end of the second UPS normal use machine unit is abnormal, the corresponding bypass power input end is switched to supply power;

when the main power supply input end of the UPS standby machine unit is abnormal, switching a first bypass power supply or a second bypass power supply of the UPS standby machine unit to supply power to the first UPS normal machine unit and the second UPS normal machine unit;

when the main power input end of the UPS standby machine unit, the main power input end of the first UPS common machine unit and the main power input end of the second UPS common machine unit all have faults, supplying power through the first mains voltage or the second mains voltage;

when the first mains voltage is abnormal, the switching module automatically switches to the second mains voltage, and power is supplied through the storage battery in the switching process.

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