CN114597938A - Aluminum-air battery hybrid power supply system and control method thereof - Google Patents

Abstract

The invention belongs to the technical field of new energy, and particularly relates to an aluminum-air battery hybrid power supply system and a control method thereof, which comprise a centralized power supply unit, a distributed power supply unit and a comprehensive management platform, wherein the centralized power supply unit comprises a diesel engine power station, a mains supply power supply module, a UPS controller and a lead-acid battery pack, the UPS controller is electrically connected with the diesel engine power station, the mains supply power supply module and the lead-acid battery pack, the distributed power supply unit comprises a plurality of aluminum-air power supplies, a plurality of DC-DC converters, a plurality of aluminum-air power supply detection modules, a lithium iron phosphate battery pack and a DC-AC conversion pack, the system has reasonable design, can temporarily supply power through the lead-acid battery pack when the mains supply and the diesel engine are switched, ensure normal power supply, and can ensure power through distributed power supply when the mains supply and the diesel engine are in failure, and the output power is distributed and adjusted according to the output power and the load power required by the load unit, so that the energy utilization rate is improved.

Description

A kind of aluminum-air battery hybrid power supply system and control method thereof

technical field

The invention belongs to the technical field of new energy, and in particular relates to an aluminum-air battery hybrid power supply system and a control method thereof.

Background technique

Electric energy is the material basis for the survival and development of human society and the strategic focus of all countries. In order to ensure the power supply reliability of important loads, emergency power generation equipment is usually installed in national defense underground projects and key civil facilities, that is, the dual power supply mode of "mains power + emergency power station" is adopted. Use the mains power supply, and use the emergency power station to supply power when the mains is interrupted or at an important time. There are many types of emergency power stations. If the combination of diesel engine + AC synchronous generator is used, it is called diesel power station. Its main advantages are high efficiency, fast start-up, low water consumption, compact equipment, convenient transportation, small civil engineering, fast construction and simple operation and maintenance. In mines, enterprises, towns, etc. far away from the power grid, diesel power plants are often used as emergency power and lighting power; in national defense projects, military bases and some important enterprises and institutions, diesel power plants are often used as emergency preparedness power and backup power.

However, the above-mentioned "mains + diesel power station" dual power supply adopts the "centralized power supply" method, that is, the mains and emergency power stations are centrally arranged, and the "backbone network" is radially supplied to the load for long-distance power supply. Once the centralized layout area of mains and emergency power stations is abnormal or destroyed, all load areas will not be able to provide power protection, and will need to be repaired to restore, and automatic isolation and transfer of fault areas cannot be achieved. In addition, there is a switching time of 15 seconds for automatic switching between mains and diesel power plants, and a switching time of 3 minutes for manual switching. During dual power switching, except for some equipment equipped with emergency power sources such as UPS and EPS, most loads will be in a state of no power guarantee. state.

With the development of electrochemistry, material science and other technologies, following new energy sources such as nuclear energy, solar energy, and wind energy, new high-efficiency chemical energy sources represented by aluminum-air batteries have received widespread attention and application. Aluminum-air batteries not only have high energy density, work Low temperature, fast start-up speed, long storage life, flexible use and partitionable layout, based on this, how to effectively and rationally use the above characteristics of aluminum-air batteries to overcome the traditional "mains + diesel power plant" dual power supply. The defect of the "type power supply" method is a key problem that needs to be solved in the field of new energy.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an aluminum-air battery hybrid power supply system and a control method thereof. By arranging multiple groups of aluminum-air batteries in a local area, multiple power supply "local area networks" are constructed, so that faults occur in the main line or in the local area. When the power supply is used, the energy dispatching between the aluminum-air batteries is arranged in partitions to ensure that the power supply of equipment in a single area is not affected; by rationally designing the topology structure and control method of the power supply system, a hybrid power supply mode combining "centralized + distributed" organically is formed, effectively Enhance power supply reliability and improve energy efficiency.

For realizing the above-mentioned technical purpose, the technical scheme adopted in the present invention is as follows:

An aluminum-air battery hybrid power supply system, including a centralized power supply unit, a distributed power supply unit and an integrated management platform, the centralized power supply unit includes a diesel engine power station, a commercial power supply module, a UPS controller and a lead-acid battery pack, the UPS controller It is electrically connected with the diesel engine power station, the mains power supply module and the lead-acid battery pack, and the distributed power supply unit includes a number of aluminum-air power supplies, a number of DC-DC converters, a number of aluminum-air power supply detection modules, a lithium iron phosphate battery pack and A DC-AC conversion group, a plurality of the aluminum-air power sources are respectively electrically connected with a plurality of DC-DC converters, and a plurality of the DC-DC converters are all electrically connected with the DC-AC conversion group, and the DC-AC conversion group and The UPS controller is electrically connected with a load unit, and the lithium iron phosphate battery pack is electrically connected with the DC-AC conversion group, the load unit and the UPS controller; the integrated management platform is connected with the UPS controller and the DC-AC conversion group. Control connection, the integrated management platform can monitor the power of the lead-acid battery pack and the lithium iron phosphate battery pack, the aluminum-air power detection module can monitor the status of the aluminum-air power supply, and the aluminum-air power detection module is connected with the integrated The signal connection of the management platform, the integrated management platform can detect the power jointly output by multiple aluminum-air power sources, and can also detect the load power of the load unit; the UPS controller can be connected or disconnected under the control of the integrated management platform Open the electrical connection with the diesel engine power station, the mains power supply module, the lead-acid battery pack and the load unit; the DC-AC conversion group can be connected or disconnected with the lithium iron phosphate battery pack and the load unit under the control of the integrated management platform electrical connection.

The UPS controller has a built-in transfer switch, and the transfer switch is electrically connected with the diesel engine power station and the commercial power supply module. The UPS controller can switch the connection with the diesel engine power station and the mains power supply module through the transfer switch.

The UPS controller is electrically connected with a transformer cabinet, and the transformer cabinet is electrically connected with the load unit.

The lithium iron phosphate battery pack is electrically connected with a bidirectional converter, and the bidirectional converter is electrically connected with the DC-AC conversion group and the load unit.

The staff can control the whole system through the integrated management platform. The diesel engine power station 3 can generate power for the load. The mains power supply module is connected to the mains for this system. The UPS controller can be switched and connected under the control of the comprehensive management platform, and the aluminum-air power supply detection module is used for real-time monitoring of the aluminum-air power supply. Power supply to ensure normal power supply, and can ensure power through distributed power supply when the mains and diesel engines fail, and distribute and adjust the output power according to the output power and the load power required by the load unit to improve energy utilization Rate.

When the centralized power supply unit is in normal working state, the staff can operate the integrated management platform to control the distributed power supply unit to stand by, control the centralized power supply unit to start working, and supply power to the load unit. When the mains power supply module in the centralized power supply unit is in normal working state , the integrated management platform controls the UPS controller to connect to the mains power supply module, directly supplies power to the UPS controller through the mains power supply module, and supplies power to the load unit through the UPS controller;

When the mains power supply module fails and needs to be switched to the diesel engine power station for power supply, the UPS controller cuts off the connection with the mains power supply module and connects with the diesel engine power station. In the switching project, the UPS controller establishes a connection with the lead-acid battery pack. Connect, discharge to the UPS controller through the lead-acid battery pack, and then transmit power to the load unit. When the mains power supply module can work normally, the UPS controller cuts off the electrical connection with the diesel power station and connects with the mains power supply module. The mains power supply module supplies power to the load unit. In the same way as the above, the load unit is temporarily supplied with power through the lead-acid battery pack;

When the mains power supply module is supplying power or the diesel engine power station is supplying power, the integrated management platform can monitor the power of the lead-acid battery pack and the lithium iron phosphate battery pack. When it is at the maximum value, it controls the UPS controller to supply power to the lead-acid battery pack and the lithium iron phosphate battery pack, so as to charge the lead-acid battery pack and the lithium iron phosphate battery pack;

When the mains power supply module supplies power or the diesel engine power station fails to supply power normally, the staff can control the centralized power supply unit to be in a standby state through the integrated management platform, and the UPS controller disconnects the mains power supply module from the diesel engine power station. The unit starts to work, so that multiple aluminum-air power supplies start to supply power at the same time, and the power is transmitted to the DC-DC converters for boosting, and the multiple DC-DC converters transmit the power to the DC-AC conversion group, which converts the direct current into AC current, and then transmit the power to the load unit through the DC-AC conversion group;

The integrated management platform detects the power output by multiple aluminum-air power supplies, and can detect the load power of the load unit. The power output by multiple aluminum-air power supplies is marked as P1, and the load power of the load unit is marked as P2. The number of aluminum-air power supplies is N. When the integrated management platform detects P1, the power is equally distributed to each aluminum-air power supply for output, and a single DC-DC converter is controlled to output the power of P1/N to a single aluminum-air power supply;

When P1>P2, the integrated management platform controls the common output power of several aluminum-air power supplies to output with P2 as the standard, and the output power of a single aluminum-air power supply is P2/N. At this time, when the integrated management platform detects the lithium iron phosphate battery When the power storage of the group does not reach the maximum value, the DC-AC conversion group transfers the power of multiple aluminum-air power sources to the lithium iron phosphate battery pack with the power of P1-P2 for charging;

When P1 < P2, and the integrated management platform detects that the remaining power of the lithium iron phosphate battery pack is greater than the minimum value, the single aluminum-air power supply will output the power of the output power P1/N, and the lithium iron phosphate battery pack will be output at the power of P2- The power of P1 is discharged. At this time, several aluminum-air power sources and lithium iron phosphate battery packs are used as load power sources to supply power to the load unit;

When P1 < P2, and the integrated management platform detects that the remaining power of the lithium iron phosphate battery pack is less than the minimum value, and the integrated management platform detects that the power of the lead-acid battery pack is greater than the minimum value, the output power of a single aluminum-air power supply will be The power of P1/N is output, and the lead-acid battery pack is discharged with the power of P2-P1. At this time, several aluminum-air power sources and lead-acid battery packs work together as the load power source to supply power to the load unit;

When P1 < P2, when the remaining power of the lead-acid battery pack and the lithium iron phosphate battery pack is less than the minimum value, the integrated management platform controls the centralized power supply unit and the distributed power supply unit to stop working and stop supplying power to the load unit.

Description of drawings

The present invention may be further illustrated by the non-limiting examples given in the accompanying drawings;

FIG. 1 is a schematic system flow diagram 1 of an embodiment of an aluminum-air battery hybrid power supply system and a control method thereof according to the present invention;

2 is a second system flow diagram of an embodiment of an aluminum-air battery hybrid power supply system and a control method thereof according to the present invention;

FIG. 3 is a third schematic system flow diagram of an embodiment of an aluminum-air battery hybrid power supply system and a control method thereof according to the present invention;

The main component symbols are explained as follows:

Integrated management platform 1, diesel power station 3, mains power supply module 31, UPS controller 32, transfer switch 321, transformer cabinet 322, lead-acid battery pack 33, aluminum-air power supply 4, DC-DC converter 41, aluminum-air power supply detection Module 42 , lithium iron phosphate battery pack 43 , bidirectional converter 431 , DC-AC conversion group 44 , load unit 45 .

Detailed ways

In order to enable those skilled in the art to better understand the present invention, the technical solutions of the present invention are further described below with reference to the accompanying drawings and embodiments.

As shown in Figures 1-3, an aluminum-air battery hybrid power supply system of the present invention includes a centralized power supply unit, a distributed power supply unit, and an integrated management platform 1. The centralized power supply unit includes a diesel engine power station 3, a mains power supply module 31, The UPS controller 32 and the lead-acid battery pack 33, the UPS controller 32 is electrically connected with the diesel engine power station 3, the commercial power supply module 31 and the lead-acid battery pack 33, and the distributed power supply unit includes several aluminum-air power supplies 4, Several DC-DC converters 41, several aluminum-air power supply detection modules 42, one lithium iron phosphate battery pack 43 and one DC-AC conversion group 44, several of the aluminum-air power supplies 4 are respectively electrically connected to several DC-DC converters 41 , a plurality of the DC-DC converters 41 are all electrically connected to the DC-AC conversion group 44, the DC-AC conversion group 44 and the UPS controller 32 are electrically connected with a load unit 45, the lithium iron phosphate battery group 43 It is electrically connected with the DC-AC conversion group 44, the load unit 45 and the UPS controller 32; the integrated management platform 1 is controlled and connected with the UPS controller 32 and the DC-AC conversion group 44, and the integrated management platform 1 can The electricity of the lead-acid battery pack 33 and the lithium iron phosphate battery pack 43 is monitored, the aluminum-air power supply detection module 42 can monitor the status of the aluminum-air power supply 4 , and the aluminum-air power supply detection module 42 is connected to the integrated management platform 1 by signal , the integrated management platform 1 can detect the power jointly output by a plurality of aluminum-air power sources 4, and can also detect the load power of the load unit 45; the UPS controller 32 can be connected or connected under the control of the integrated management platform 1. Disconnect the electrical connection with the diesel power station 3, the mains power supply module 31, the lead-acid battery pack 33 and the load unit 45; the DC-AC conversion group 44 can be connected or disconnected with the phosphoric acid under the control of the integrated management platform 1 Electrical connection between the iron-lithium battery pack 43 and the load unit 45 . The UPS controller 32 has a built-in transfer switch 321 , and the transfer switch 321 is electrically connected to the diesel engine power station 3 and the commercial power supply module 31 . The UPS controller 32 can switch the connection with the diesel engine power station 3 and the commercial power supply module 31 through the transfer switch 321 . The UPS controller 32 is electrically connected to a transformer cabinet 322 , and the transformer cabinet 322 is electrically connected to the load unit 45 . The lithium iron phosphate battery pack 43 is electrically connected with a bidirectional converter 431 , and the bidirectional converter 431 is electrically connected with the DC-AC conversion group 44 and the load unit 45 .

When the centralized power supply unit is in normal working state, the staff can operate the integrated management platform 1 to control the distributed power supply unit to stand by, control the centralized power supply unit to start working, and supply power to the load unit 45. When the mains power supply module 31 in the centralized power supply unit is in normal state In the working state, the integrated management platform 1 controls the UPS controller 32 to connect to the mains power supply module 31, directly supplies power to the UPS controller 32 through the mains power supply module 31, and supplies power to the load unit 45 through the UPS controller 32; When the 31 fails and needs to be switched to the diesel engine power station 3 for power supply, the UPS controller 32 cuts off the connection with the mains power supply module 31 and connects with the diesel engine power station 3. In the switching project, the UPS controller 32 establishes a connection with the lead-acid battery pack. The connection of 33 is discharged to the UPS controller 32 through the lead-acid battery pack 33, and then transmitted to the load unit 45 to supply power. When the commercial power supply module 31 can work normally, the UPS controller 32 cuts off the electrical connection with the diesel engine power station 3, and The mains power supply module 31 is connected to supply power to the load unit 45 through the mains power supply module 31. In the same way as above, during the switching process, the load unit 45 is temporarily supplied with power through the lead-acid battery pack 33; when the mains power supply module 31 When supplying power or the diesel power station 3 is supplying power, the integrated management platform 1 can monitor the power of the lead-acid battery pack 33 and the lithium iron phosphate battery pack 43, and when the power of the lead-acid battery pack 33 and the lithium iron phosphate battery pack 43 is detected When it is not at the maximum value, the UPS controller 32 is controlled to supply power to the lead-acid battery pack 33 and the lithium iron phosphate battery pack 43, thereby charging the lead-acid battery pack 33 and the lithium iron phosphate battery pack 43; when the mains power supply module 31 When power is supplied or the diesel power station 3 cannot perform power supply work normally, the staff can control the centralized power supply unit to be in a standby state through the integrated management platform 1, and the UPS controller 32 disconnects the mains power supply module 31 from the diesel power station 3. The connection of the power supply is distributed. The unit starts to work, so that the plurality of aluminum air power sources 4 start to supply power at the same time, and the power is respectively transmitted to the DC-DC converter 41 for boosting, and the plurality of DC-DC converters 41 transmit the power to the DC-AC conversion group 44, The direct current is changed into alternating current, and then the power is transmitted to the load unit 45 through the DC-AC conversion group 44; Detection, the power output by multiple aluminum air power sources 4 is marked as P1, the load power of the load unit 45 is marked as P2, and the number of several aluminum air power sources 4 is N. When the integrated management platform 1 detects P1, the power is averaged. Output each aluminum-air power supply 4, and control a single DC-DC converter 41 to output the single aluminum-air power supply 4 with the power of P1/N; when P1>P2, the integrated management platform 1 controls the power of several aluminum-air power supplies 4. The common output power is output with P2 as the standard, and the output power of a single aluminum-air power supply 4 is P2/N, At this time, when the integrated management platform 1 detects that the power storage of the lithium iron phosphate battery pack 43 has not reached the maximum value, the DC-AC conversion group 44 transfers the power of the multiple aluminum-air power sources 4 to the phosphoric acid with the power of P1-P2. The iron-lithium battery pack 43 is charged; when P1 < P2, and the integrated management platform 1 detects that the remaining power of the lithium-iron phosphate battery pack 43 is greater than the minimum value, the output power of the single aluminum-air power supply 4 is P1/N. Output, the lithium iron phosphate battery pack 43 is discharged with the power of P2-P1, and at this time several aluminum-air power sources 4 and the lithium iron phosphate battery pack 43 are used together as the load power supply to supply power to the load unit 45; when P1<P2, And the integrated management platform 1 detects that the remaining power of the lithium iron phosphate battery pack 43 is less than the minimum value, and when the integrated management platform 1 detects that the power level of the lead-acid battery pack 33 is greater than the minimum value, the output power of the single aluminum-air power supply 4 is P1. The power of /N is output, and the lead-acid battery 33 is discharged with the power of P2-P1. At this time, several aluminum-air power sources 4 and the lead-acid battery 33 are jointly used as the load power to supply power to the load unit 45; when P1<P2 When the remaining power of the lead-acid battery pack 33 and the lithium iron phosphate battery pack 43 is less than the minimum value, the integrated management platform 1 controls both the centralized power supply unit and the distributed power supply unit to stop working, and stops supplying power to the load unit 45 .

The present invention has a reasonable design, can temporarily supply power through the lead-acid battery pack 33 when the mains and the diesel engine are switched to ensure normal power supply, and can guarantee the power through distributed power supply when the mains and the diesel engine fail, and The output power is distributed and adjusted according to the output power and the load power required by the load unit, so as to improve the energy utilization rate.

The above-mentioned embodiments merely illustrate the principles and effects of the present invention, but are not intended to limit the present invention. Anyone skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed in the present invention should still be covered by the claims of the present invention.

Claims (5)

1. an aluminum-air battery hybrid power supply system, it is characterized in that: comprise centralized power supply unit and distributed power supply unit and integrated management platform, described centralized power supply unit comprises diesel engine power station, mains power supply module, UPS controller and lead-acid battery pack , the UPS controller is electrically connected with the diesel engine power station, the mains power supply module and the lead-acid battery pack, and the distributed power supply unit includes several aluminum-air power supplies, several DC-DC converters, several aluminum-air power supply detection modules, a A lithium iron phosphate battery pack and a DC-AC conversion group, a plurality of the aluminum-air power sources are respectively electrically connected with a plurality of DC-DC converters, and a plurality of the DC-DC converters are all electrically connected with the DC-AC conversion group, and the The DC-AC conversion group and the UPS controller are electrically connected with a load unit, and the lithium iron phosphate battery group is electrically connected with the DC-AC conversion group, the load unit and the UPS controller; The integrated management platform is connected to the UPS controller and the DC-AC conversion group. The integrated management platform can monitor the power of the lead-acid battery pack and the lithium iron phosphate battery pack. The aluminum-air power detection module can To monitor the status of the aluminum air power supply, the aluminum air power supply detection module is connected to the integrated management platform. detection; The UPS controller can connect or disconnect the electrical connection with the diesel engine power station, the commercial power supply module, the lead-acid battery pack and the load unit under the control of the integrated management platform; The DC-AC conversion group can connect or disconnect the electrical connection with the lithium iron phosphate battery pack and the load unit under the control of the integrated management platform. 2 . The aluminum-air battery hybrid power supply system according to claim 1 , wherein the UPS controller has a built-in transfer switch, and the transfer switch is electrically connected to the diesel engine power station and the commercial power supply module. 3 . 3 . The aluminum-air battery hybrid power supply system according to claim 1 , wherein the UPS controller is electrically connected with a transformer cabinet, and the transformer cabinet is electrically connected with the load unit. 4 . 4. An aluminum-air battery hybrid power supply system according to claim 1, wherein the lithium iron phosphate battery pack is electrically connected with a bidirectional converter, and the bidirectional converter and the DC-AC conversion group are The load cells are electrically connected. 5. An aluminum-air battery hybrid power supply control method, the aluminum-air battery hybrid power supply system according to any one of claims 1-4, wherein the method comprises the following steps: Step 1: When the centralized power supply unit is in normal working state, the staff can operate the integrated management platform to control the distributed power supply unit to stand by, control the centralized power supply unit to start working, and supply power to the load unit. When the mains power supply module in the centralized power supply unit is in normal state In the working state, the integrated management platform controls the UPS controller to connect to the mains power supply module, directly supplies power to the UPS controller through the mains power supply module, and supplies power to the load unit through the UPS controller; Step 2: When the mains power supply module fails and needs to be switched to the diesel engine power station for power supply, the UPS controller cuts off the connection with the mains power supply module and connects with the diesel engine power station. The connection of the battery pack is discharged to the UPS controller through the lead-acid battery pack, and then transmitted to the load unit to supply power. When the mains power supply module can work normally, the UPS controller cuts off the electrical connection with the diesel engine power station, and communicates with the mains power supply module. Connect, supply power to the load unit through the mains power supply module, and in the same way as above during the switching process, temporarily supply power to the load unit through the lead-acid battery pack; Step 3: When the mains power supply module is supplying power or the diesel engine power station is supplying power, the integrated management platform can monitor the power of the lead-acid battery pack and the lithium iron phosphate battery pack. When the lead-acid battery pack and the lithium iron phosphate battery pack are detected When the power of the UPS is not at the maximum value, control the UPS controller to supply power to the lead-acid battery pack and the lithium iron phosphate battery pack, so as to charge the lead-acid battery pack and the lithium iron phosphate battery pack; Step 4: When the mains power supply module is supplying power or the diesel engine power station cannot supply power normally, the staff can control the centralized power supply unit to be in a standby state through the integrated management platform, and the UPS controller disconnects the mains power supply module and the diesel engine power station. , the distributed power supply unit starts to work, so that multiple aluminum-air power supplies start to supply power at the same time, and the power is respectively transmitted to the DC-DC converter for boosting, and the multiple DC-DC converters transmit the power to the DC-AC conversion group. The direct current is converted into alternating current, and then the power is transmitted to the load unit through the DC-AC conversion group; Step 4: The integrated management platform detects the power output by multiple aluminum-air power sources, and can detect the load power of the load unit. The power output by multiple aluminum-air power sources is marked as P1, and the load power of the load unit is marked as P2. , the number of several aluminum-air power supplies is N. When the integrated management platform detects P1, the power is evenly distributed to each aluminum-air power supply for output, and a single DC-DC converter is controlled to power a single aluminum-air power supply with the power of P1/N. output; Step 5: When P1>P2, the integrated management platform controls the common output power of several aluminum-air power supplies to output with P2 as the standard, and the output power of a single aluminum-air power supply is P2/N. At this time, when the integrated management platform detects phosphoric acid When the power storage of the lithium iron battery pack does not reach the maximum value, the DC-AC conversion group transfers the power of multiple aluminum-air power sources to the lithium iron phosphate battery pack with the power of P1-P2 for charging; Step 6: When P1 < P2, and the integrated management platform detects that the remaining power of the lithium iron phosphate battery pack is greater than the minimum value, the single aluminum-air power supply will output the power of the output power P1/N, and the lithium iron phosphate battery pack will output the power of P1/N. Discharge with the power of P2-P1. At this time, several aluminum-air power sources and lithium iron phosphate battery packs are used as load power sources to supply power to the load unit; Step 7: When P1 < P2, and the integrated management platform detects that the remaining power of the lithium iron phosphate battery pack is less than the minimum value, and the integrated management platform detects that the power of the lead-acid battery pack is greater than the minimum value, then the single aluminum-air power supply The output power is output with the power of P1/N, and the lead-acid battery pack is discharged with the power of P2-P1. At this time, several aluminum-air power sources and lead-acid battery packs are jointly used as the load power source to supply power to the load unit; Step 8: When P1 < P2, when the remaining power of the lead-acid battery pack and the lithium iron phosphate battery pack is less than the minimum value, the integrated management platform controls both the centralized power supply unit and the distributed power supply unit to stop working and stop supplying power to the load unit.

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