Host power supply system and power supply method

Abstract

The invention belongs to the technical field of electrics, and relates to a host power supply system and method. The test system comprises four units, each unit is provided with three power supplies, two power supplies are working power supplies, and one power supply is a standby power supply. The power supply system is designed to be provided with three levels of standby power supplies, the standby power supplies are automatically switched on, and the priority is that the first-level standby power supply is first, the second-level standby power supply is second, and the third-level standby power supply is last. When output current protection, water flow protection, input power-loss protection and other protection except the output current protection, the water flow protection and the input power-loss protection occur to the working power supply and corresponding conditions are met, the working power supply is automatically switched and put into the standby power supply according to the priority. Each working power supply of the power supply system is provided with three standby power supplies, so that the standby coefficient is high; and when the standby power supply is completely occupied, one standby power supply can be manually operated to simultaneously drive two section loads to run, so that the surplus capacity of the power supply is fully utilized, and the reliability of the system is further improved.

Description

Technical Field

[0001] This application belongs to the field of electrical technology and relates to a host power supply system and power supply method. Background Technology

[0002] The existing power supply system for hysteresis motor-type mainframes uses two power supplies within the unit as primary backup power supplies for each other, and sets up an independent backup power supply as a secondary backup power supply. This power supply system has the following disadvantages: First, it requires high power supply capacity, because due to the mutual backup relationship, each power supply must be able to simultaneously power two load sections; second, it requires power supplies with strong surge protection to ensure that when one load section is running, the other load section can be switched on; third, the redundancy factor is low, with a maximum of only two backup power supplies for a single load section; and fourth, the degree of automation is low, with only the primary backup power supply automatically switching on, and the secondary backup power supply manually switching on. Summary of the Invention

[0003] The purpose of this application is to design a mainframe power supply system and method. According to production process requirements, the mainframe's hysteresis motor needs to operate continuously for extended periods. To ensure uninterrupted power supply to the mainframe motor, a highly reliable and safe power supply system and method are required. This power supply system can reduce power capacity requirements and investment costs; it features three levels of backup with a high backup coefficient; all three backup power supplies can be automatically activated, ensuring high power supply reliability.

[0004] Technical solution to achieve the purpose of this application:

[0005] This application provides a host power supply system, including:

[0006] First working power supply 1, second working power supply 2, third working power supply 3, fourth working power supply 4, fifth working power supply 5, sixth working power supply 6, seventh working power supply 7, eighth working power supply 8;

[0007] First backup power supply 9, second backup power supply 10, third backup power supply 11, fourth backup power supply 12;

[0008] And the first working power supply section cabinet 13, the second working power supply section cabinet 14, the third working power supply section cabinet 15, the fourth working power supply section cabinet 16, the fifth working power supply section cabinet 17, the sixth working power supply section cabinet 18, the seventh working power supply section cabinet 19, the eighth working power supply section cabinet 20, the first backup power supply section cabinet 21, the second backup power supply section cabinet 22, the third backup power supply section cabinet 23, and the fourth backup power supply section cabinet 24;

[0009] in:

[0010] The first working power supply 1, the second working power supply 2 and the first backup power supply 9 constitute the first unit;

[0011] The third working power supply 3, the fourth working power supply 4 and the second backup power supply 10 constitute the second unit;

[0012] The fifth working power supply 5, the sixth working power supply 6, and the third backup power supply 11 constitute the third unit;

[0013] The seventh working power supply 7, the eighth working power supply 8, and the fourth backup power supply 12 constitute the fourth unit.

[0014] Optionally, the power supply system comprises four units, each unit including two working power supplies and one backup power supply, wherein:

[0015] The backup power supply for each unit is used to provide backup for the two working power supplies in this unit;

[0016] Each unit's backup power supply is connected to the two working power supplies in that unit and can automatically switch between them, with each level of backup power supply having a different priority.

[0017] The backup power supply is divided into three levels according to priority from high to low: Level 1 backup power supply, Level 2 backup power supply and Level 3 backup power supply. Each level of backup power supply is in hot standby mode and can be automatically put into use.

[0018] When the main power supply fails, the backup power supply of each unit will automatically start according to the priority from high to low, and provide manual start operation in case the backup power supply fails to be put into operation.

[0019] Optionally, the backup power supply's backup relationship is as follows:

[0020] The primary backup power supply for the first working power supply 1 and the second working power supply 2 is the first backup power supply 9, the secondary backup power supply is the third backup power supply 11, and the tertiary backup power supply is the second backup power supply 10.

[0021] The first-level backup power supply for the third working power supply 3 and the fourth working power supply 4 is the second backup power supply 10, the second-level backup power supply is the fourth backup power supply 12, and the third-level backup power supply is the first backup power supply 9.

[0022] The first-level backup power supply for the fifth working power supply 5 and the sixth working power supply 6 is the third backup power supply 11, the second-level backup power supply is the first backup power supply 9, and the third-level backup power supply is the fourth backup power supply 12.

[0023] The primary backup power supply for the seventh working power supply 7 and the eighth working power supply 8 is the fourth backup power supply 12, the secondary backup power supply is the second backup power supply 10, and the tertiary backup power supply is the third backup power supply 11.

[0024] Optionally, the working power supply, primary backup power supply, secondary backup power supply and tertiary backup power supply of each unit can be switched through the section cabinet.

[0025] Optionally, each section cabinet in the power supply system also includes a single-pole double-throw disconnector and a circuit breaker with an electric operating mechanism for controlling the switching between the working power supply and the backup power supply.

[0026] A host power supply method includes the following steps:

[0027] S1: During normal operation, the working power supply provides power to the load in this section;

[0028] S2: When the power supply fails, the power supply will be automatically restarted first;

[0029] S3: If the working power supply fails to restart, the primary backup power supply will be automatically activated.

[0030] S4: If the primary backup power supply fails to start, the secondary backup power supply will be automatically started.

[0031] S5: If the secondary backup power supply fails to start, the tertiary backup power supply will be automatically started.

[0032] S6: Provides manual switching function when the third-level backup power supply fails to start;

[0033] S7: When the backup power supply is occupied, the unoccupied backup power supplies will be started in order of priority. If the primary backup power supply is occupied, the secondary backup power supply will be started first; if the secondary backup power supply is occupied, the tertiary backup power supply will be started.

[0034] Optionally, when the working section cabinet fails, the third-level backup power supply becomes the priority power supply and is automatically switched on to supply power to the load of this section.

[0035] Optionally, when the backup power supply of a certain section is completely occupied, a backup power supply can be manually operated to run the load of two sections simultaneously.

[0036] Optionally, this method executes different logic responses for different power protection types, specifically including:

[0037] When the working power supply experiences output current protection, the backup power supply will be automatically switched according to priority.

[0038] When the working power supply experiences water flow protection, if the cooling water flow is less than a certain value, an alarm will be triggered and the machine will be shut down for protection. If the cooling water flow fails to recover, the backup power supply will be automatically started according to priority.

[0039] When the working power supply experiences an input power failure protection event, if it is not restored within a certain period of time, the backup power supply will be automatically started according to priority.

[0040] When other types of protection occur, if the working power supply fails to be restored, the backup power supply will be automatically started according to priority.

[0041] Optionally, after a power protection action is triggered, the working power supply will attempt to restart automatically. If the restart fails after 3 attempts, the backup power supply will be automatically started according to priority. The working power supply is considered successful only if it runs normally for 1 minute after restarting. After that, the number of attempts and time will be reset and recalculated.

[0042] The beneficial technical effects of this application are as follows:

[0043] (1) Each working power source in this power supply system has three backup power sources, resulting in a high backup factor.

[0044] (2) All three levels of backup power supply of the power supply system can be automatically put into operation, which has very high reliability.

[0045] (3) When the backup power supply is fully occupied, a backup power supply can be manually operated to run two sections of load at the same time, making full use of the power supply's spare capacity and further improving the system's reliability.

[0046] (4) When the working section cabinet fails, the third-level backup power supply becomes the priority power supply and directly switches to the third-level backup power supply to supply power to the load of this section, which can prevent the failure from happening again when the first-level backup and second-level backup power supplies are put into operation.

[0047] (5) When the working power supply fails for various reasons, the working power supply will be automatically restarted to supply power to the load in this section, which can eliminate the accidental fault.

[0048] (6) When all three backup power supplies fail to start automatically, the backup power supply can be started manually on-site to prevent the backup power supply from failing to start due to the failure to meet the switching logic conditions. Attached Figure Description

[0049] Figure 1 This is a schematic diagram of a host power supply system;

[0050] Figure 2 A schematic diagram of a section cabinet structure for a host power supply system;

[0051] Figure 3 This is a schematic diagram of the backup section cabinet structure of a host power supply system.

[0052] In the picture:

[0053] 1-First working power supply, 2-Second working power supply, 3-Third working power supply, 4-Fourth working power supply, 5-Fifth working power supply, 6-Sixth working power supply, 7-Seventh working power supply, 8-Eighth working power supply;

[0054] 9-First backup power supply, 10-Second backup power supply, 11-Third backup power supply, 12-Fourth backup power supply;

[0055] 13-First working power supply section cabinet, 14-Second working power supply section cabinet, 15-Third working power supply section cabinet, 16-Fourth working power supply section cabinet, 17-Fifth working power supply section cabinet, 18-Sixth working power supply section cabinet, 19-Seventh working power supply section cabinet, 20-Eighth working power supply section cabinet.

[0056] 21-First backup power section cabinet, 22-Second backup power section cabinet, 23-Third backup power section cabinet, 24-Fourth backup power section cabinet;

[0057] 25-Disconnecting switch; 26-First single-pole double-throw disconnecting switch with electric operating mechanism; 27-First circuit breaker with electric operating mechanism; 28-Second circuit breaker with electric operating mechanism; 29-Second single-pole double-throw disconnecting switch with electric operating mechanism;

[0058] 30 - Single-pole double-throw disconnector with electric operating mechanism; 31 - Circuit breaker with electric operating mechanism. Detailed Implementation

[0059] To enable those skilled in the art to better understand this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only a part of the embodiments of this application, and not all of them. Based on the embodiments described in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0060] See Figures 1-3 This application provides a host power supply system, including:

[0061] First working power supply 1, second working power supply 2, third working power supply 3, fourth working power supply 4, fifth working power supply 5, sixth working power supply 6, seventh working power supply 7, eighth working power supply 8;

[0062] First backup power supply 9, second backup power supply 10, third backup power supply 11, fourth backup power supply 12;

[0063] And the first working power supply section cabinet 13, the second working power supply section cabinet 14, the third working power supply section cabinet 15, the fourth working power supply section cabinet 16, the fifth working power supply section cabinet 17, the sixth working power supply section cabinet 18, the seventh working power supply section cabinet 19, the eighth working power supply section cabinet 20, the first backup power supply section cabinet 21, the second backup power supply section cabinet 22, the third backup power supply section cabinet 23, and the fourth backup power supply section cabinet 24;

[0064] in:

[0065] The first working power supply 1, the second working power supply 2 and the first backup power supply 9 constitute the first unit;

[0066] The third working power supply 3, the fourth working power supply 4 and the second backup power supply 10 constitute the second unit;

[0067] The fifth working power supply 5, the sixth working power supply 6, and the third backup power supply 11 constitute the third unit;

[0068] The seventh working power supply 7, the eighth working power supply 8, and the fourth backup power supply 12 constitute the fourth unit.

[0069] Optionally, the power supply system comprises four units, each unit including two working power supplies and one backup power supply, wherein:

[0070] The backup power supply for each unit is used to provide backup for the two working power supplies in this unit;

[0071] Each unit's backup power supply is connected to the two working power supplies in that unit and can automatically switch between them, with each level of backup power supply having a different priority.

[0072] The backup power supply is divided into three levels according to priority from high to low: Level 1 backup power supply, Level 2 backup power supply and Level 3 backup power supply. Each level of backup power supply is in hot standby mode and can be automatically put into use.

[0073] When the main power supply fails, the backup power supply of each unit will automatically start according to the priority from high to low, and provide manual start operation in case the backup power supply fails to be put into operation.

[0074] Optionally, the backup power supply's backup relationship is as follows:

[0075] The primary backup power supply for the first working power supply 1 and the second working power supply 2 is the first backup power supply 9, the secondary backup power supply is the third backup power supply 11, and the tertiary backup power supply is the second backup power supply 10.

[0076] The first-level backup power supply for the third working power supply 3 and the fourth working power supply 4 is the second backup power supply 10, the second-level backup power supply is the fourth backup power supply 12, and the third-level backup power supply is the first backup power supply 9.

[0077] The first-level backup power supply for the fifth working power supply 5 and the sixth working power supply 6 is the third backup power supply 11, the second-level backup power supply is the first backup power supply 9, and the third-level backup power supply is the fourth backup power supply 12.

[0078] The primary backup power supply for the seventh working power supply 7 and the eighth working power supply 8 is the fourth backup power supply 12, the secondary backup power supply is the second backup power supply 10, and the tertiary backup power supply is the third backup power supply 11.

[0079] Optionally, the working power supply, primary backup power supply, secondary backup power supply and tertiary backup power supply of each unit can be switched through the section cabinet.

[0080] Optionally, each section cabinet in the power supply system also includes a single-pole double-throw disconnector and a circuit breaker with an electric operating mechanism for controlling the switching between the working power supply and the backup power supply.

[0081] Example

[0082] S1: During normal operation, the working power supply provides power to the load in this section;

[0083] During normal operation, taking the first working power supply section cabinet 13 as an example, the first working power supply 1 supplies power to the load of this section through the isolation switch 25 of the section cabinet 13, the first circuit breaker 27 with electric operating mechanism, and the left side of the second single-pole double-throw isolation switch 29 with electric operating mechanism.

[0084] S2: When the power supply fails, the power supply will be automatically restarted first;

[0085] When the first working power supply 1 fails and stops due to various reasons, the first circuit breaker 27 with electric operating mechanism of the first working power supply section cabinet 13 is disconnected, the fault of the first working power supply 1 is reset, the first circuit breaker 27 with electric operating mechanism of the first working power supply section cabinet 13 is closed, and the first working power supply 1 is automatically restarted to supply power to the load of this section.

[0086] S3: If the working power supply fails to restart, the primary backup power supply will be automatically activated.

[0087] When the first working power supply 1 fails to restart automatically, the first circuit breaker 27 with an electric operating mechanism of the first working power supply section cabinet 13 is disconnected, the second circuit breaker 28 with an electric operating mechanism of the first working power supply section cabinet 13 is closed, and the first backup power supply 9 is automatically started to supply power to the load of this section.

[0088] S4: If the primary backup power supply fails to start, the secondary backup power supply will be automatically started.

[0089] When the first backup power supply 9 fails to start automatically, disconnect the second circuit breaker 28 with an electric operating mechanism of the first working power supply section cabinet 13, place the first single-pole double-throw isolating switch 26 with an electric operating mechanism of the first working power supply section cabinet on the right side, close the second circuit breaker 28 with an electric operating mechanism of the first working power supply section cabinet 13, and the second backup power supply 11 will automatically start to supply power to the load of this section.

[0090] S5: If the secondary backup power supply fails to start, the tertiary backup power supply will be automatically started.

[0091] When the third backup power supply 11 fails to start automatically, disconnect the second circuit breaker 28 with an electric operating mechanism in the first working power supply section cabinet 13, place the first single-pole double-throw disconnector 26 with an electric operating mechanism in the first working power supply section cabinet to the left position, place the second single-pole double-throw disconnector 29 with an electric operating mechanism in the first working power supply section cabinet to the right position, place the single-pole double-throw disconnector 30 with an electric operating mechanism in the third backup power supply section cabinet 23 to the left position, close the circuit breaker 31 with an electric operating mechanism in the third backup power supply section cabinet 23, and automatically start the third backup power supply 11 to supply power to the load in this section.

[0092] S6: Provides manual switching function when the third-level backup power supply fails to start;

[0093] When the third backup power supply 11 fails to start automatically, a manual operator goes to the site to switch to local operation mode, closes the circuit breaker and disconnect switch, and starts the backup power supply 3.

[0094] S7: When the backup power supply is occupied, the unoccupied backup power supplies will be started in order of priority. If the primary backup power supply is occupied, the secondary backup power supply will be started first; if the secondary backup power supply is occupied, the tertiary backup power supply will be started.

[0095] When a backup power supply is occupied, the unoccupied backup power supplies are started sequentially according to priority. That is, if the primary backup power supply is occupied, the secondary backup power supply is started first. If the secondary backup power supply is occupied, the tertiary backup power supply is started. For example, if the primary working power supply 1 fails and the primary backup power supply 9 is occupied, the first circuit breaker 27 with an electric operating mechanism of the primary working power supply section cabinet 13 is automatically disconnected, the first single-pole double-throw disconnector 26 with an electric operating mechanism of the primary working power supply section cabinet is placed in the right position, the second circuit breaker 28 with an electric operating mechanism of the primary working power supply section cabinet 13 is closed, and the third backup power supply 11 is automatically started.

[0096] When the working power supply section cabinet fails, the backup power supply 3 becomes the priority power supply, directly switching to the backup power supply 3 to power the loads in this section. For example, when the first working power supply section cabinet 13 fails, the first circuit breaker 27 with an electric operating mechanism in the first working power supply section cabinet 13 is automatically disconnected, the second single-pole double-throw disconnector 29 with an electric operating mechanism in the first working power supply section cabinet 13 is placed in the right position, the single-pole double-throw disconnector 30 with an electric operating mechanism in the third backup power supply section cabinet 23 is placed in the left position, the circuit breaker 31 with an electric operating mechanism in the third backup power supply section cabinet 23 is closed, and the third backup power supply 11 of the three-level backup power supply is automatically started to power the loads in this section.

[0097] When the backup power supply of a certain section is completely occupied, a backup power supply is manually operated to run simultaneously with the loads of two sections. For example, if the first working power supply 1 fails, and at the same time the first backup power supply 9 of unit 1 is occupied due to the failure of the second working power supply 2, the second backup power supply 10 of unit 2 is occupied due to the failure of the third working power supply 3, and the third backup power supply 11 of the three-electric unit is occupied due to the failure of the fifth working power supply 5, the second circuit breaker 28 with the electric operating mechanism of the first working section cabinet 13 is manually closed, and the first backup power supply 9 simultaneously supplies power to the loads of the first working section cabinet 13 and the second working section cabinet 14.

[0098] This power supply system executes different logic for different types of power protection. For example:

[0099] When the first working power supply 1 experiences output current protection, it will automatically switch to the first backup power supply 9.

[0100] When the first working power supply 1 experiences a water flow protection alarm, an alarm is triggered when the cooling water flow rate is 4-6 L / min. After 10 minutes, the first working power supply 1 shuts down under protection. If the first working power supply 1 detects that the cooling water flow rate has recovered within 3 minutes after the protection action, it restarts automatically. If the cooling water flow rate does not recover within 3 minutes, the first backup power supply 9 automatically starts. When the cooling water flow rate is less than 4 L / min, an alarm is triggered. After 2 minutes, the first working power supply 1 trips under protection. If the first working power supply detects that the cooling water flow rate has recovered within 3 minutes after the protection action, it restarts automatically. If the cooling water flow rate does not recover within 3 minutes, the first backup power supply 9 automatically starts.

[0101] If the primary working power supply 1 experiences an input voltage loss protection event and recovers within 2 minutes, the primary working power supply 1 will automatically restart. If it fails to recover within 2 minutes, the primary backup power supply 9 will automatically start.

[0102] If the first working power supply 1 experiences any other protection action (excluding output current protection, water flow protection, and input voltage loss protection), it will automatically restart within 2 minutes. If it fails to restart after 3 attempts, it will switch to the first backup power supply 9. A successful restart requires 1 minute of normal operation; after that, the number of restart attempts and time will be reset and recalculated.

[0103] The power supply system structure under normal operation is as follows:

[0104] When the working power supply is in operation, taking the first working power supply section cabinet 13 as an example, the output terminal of the first working power supply 1 is connected to the upper end of the disconnect switch 25 of the first working power supply section cabinet 13, the lower end of the disconnect switch 25 is connected to the upper end of the first circuit breaker 27 with electric operating mechanism, the lower end of the first circuit breaker 27 with electric operating mechanism is simultaneously connected to the lower end of the second circuit breaker 28 with electric operating mechanism and the left side of the second single-pole double-throw disconnect switch 29 with electric operating mechanism, and the common terminal of the second single-pole double-throw disconnect switch 29 with electric operating mechanism is connected to the load.

[0105] When the backup power supply is in operation, taking the first working power supply section cabinet 13 as an example, the output terminal of the first backup power supply 9 is connected to the common terminal of the first electric operating mechanism single-pole double-throw disconnector 26 of the first backup power supply section cabinet 21. The right side of the first electric operating mechanism single-pole double-throw disconnector 26 of the first backup power supply section cabinet 21 is connected to the left side of the first electric operating mechanism single-pole double-throw disconnector 26 of the first working power supply section cabinet 13. The common terminal of the first electric operating mechanism single-pole double-throw disconnector 26 of the first working power supply section cabinet 13 is connected to the upper end of the second electric operating mechanism circuit breaker 28. The lower end of the second electric operating mechanism circuit breaker 28 is simultaneously connected to the lower end of the first electric operating mechanism circuit breaker 27 and the left side of the second electric operating mechanism single-pole double-throw disconnector 29. The common terminal of the second electric operating mechanism single-pole double-throw disconnector 29 is connected to the load.

[0106] When two power supplies are in operation, taking the first working power supply section cabinet 13 as an example, the output terminal of the third backup power supply 11 is connected to the common terminal of the single-pole double-throw disconnector 30 with electric operating mechanism in the third backup power supply section cabinet 23. The right side of the single-pole double-throw disconnector 30 with electric operating mechanism in the third backup power supply section cabinet 23 is connected to the right side of the first single-pole double-throw disconnector 26 with electric operating mechanism in the first working power supply section cabinet 13. The common terminal of the first single-pole double-throw disconnector 26 with electric operating mechanism in the first working power supply section cabinet 13 is connected to the upper end of the second circuit breaker 28 with electric operating mechanism. The lower end of the second circuit breaker 28 with electric operating mechanism is simultaneously connected to the lower end of the first circuit breaker 27 with electric operating mechanism and the left side of the second single-pole double-throw disconnector 29 with electric operating mechanism. The common terminal of the second single-pole double-throw disconnector 29 with electric operating mechanism is connected to the load.

[0107] When the power supply is provided by three backup power sources, taking the first working power supply section cabinet 13 as an example, the output terminal of the second backup power supply 10 is connected to the common terminal of the single-pole double-throw disconnector 30 with electric operating mechanism in the second backup power supply section cabinet 22. The left side of the single-pole double-throw disconnector 30 with electric operating mechanism in the second backup power supply section cabinet 22 is connected to the upper end of the circuit breaker 31 with electric operating mechanism. The lower end of the circuit breaker 31 with electric operating mechanism is connected to the right side of the second single-pole double-throw disconnector 29 with electric operating mechanism in the first working power supply section cabinet 13. The common terminal of the second single-pole double-throw disconnector 29 with electric operating mechanism is connected to the load.

[0108] The present application has been described in detail above with reference to the accompanying drawings and embodiments. However, the present application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present application. All content not described in detail in this application can be derived from existing technology.

Claims

1. A host power supply system, characterized in that, Including the first working power supply (1), the second working power supply (2), the third working power supply (3), the fourth working power supply (4), the fifth working power supply (5), the sixth working power supply (6), the seventh working power supply (7), and the eighth working power supply (8); First backup power supply (9), second backup power supply (10), third backup power supply (11), fourth backup power supply (12); And the first working power supply section cabinet (13), the second working power supply section cabinet (14), the third working power supply section cabinet (15), the fourth working power supply section cabinet (16), the fifth working power supply section cabinet (17), the sixth working power supply section cabinet (18), the seventh working power supply section cabinet (19), the eighth working power supply section cabinet (20), the first backup power supply section cabinet (21), the second backup power supply section cabinet (22), the third backup power supply section cabinet (23), and the fourth backup power supply section cabinet (24); in: The first working power supply (1), the second working power supply (2), and the first backup power supply (9) constitute the first unit; The third working power supply (3), the fourth working power supply (4), and the second backup power supply (10) constitute the second unit; The fifth working power supply (5), the sixth working power supply (6), and the third backup power supply (11) constitute the third unit; The seventh working power supply (7), the eighth working power supply (8), and the fourth backup power supply (12) constitute the fourth unit.

2. The host power supply system according to claim 1, characterized in that, The power supply system consists of four units, each containing two working power supplies and one backup power supply, wherein: The backup power supply for each unit is used to provide backup for the two working power supplies in this unit; Each unit's backup power supply is connected to the two working power supplies in that unit and can automatically switch between them, with each level of backup power supply having a different priority. The backup power supply is divided into three levels according to priority from high to low: Level 1 backup power supply, Level 2 backup power supply and Level 3 backup power supply. Each level of backup power supply is in hot standby mode and can be automatically put into use. When the main power supply fails, the backup power supply of each unit will automatically start according to the priority from high to low, and provide manual start operation in case the backup power supply fails to be put into operation.

3. A host power supply system according to claim 2, characterized in that, The backup power supply's backup relationship is as follows: The first-level backup power supply of the first working power supply (1) and the second working power supply (2) is the first backup power supply (9), the second-level backup power supply is the third backup power supply (11), and the third-level backup power supply is the second backup power supply (10). The first-level backup power supply of the third working power supply (3) and the fourth working power supply (4) is the second backup power supply (10), the second-level backup power supply is the fourth backup power supply (12), and the third-level backup power supply is the first backup power supply (9). The first-level backup power supply of the fifth working power supply (5) and the sixth working power supply (6) is the third backup power supply (11), the second-level backup power supply is the first backup power supply (9), and the third-level backup power supply is the fourth backup power supply (12). The first-level backup power supply of the seventh working power supply (7) and the eighth working power supply (8) is the fourth backup power supply (12), the second-level backup power supply is the second backup power supply (10), and the third-level backup power supply is the third backup power supply (11).

4. A host power supply system according to claim 3, characterized in that, The working power supply, primary backup power supply, secondary backup power supply and tertiary backup power supply of each unit are switched through the section cabinet.

5. A host power supply system according to claim 4, characterized in that, Each section cabinet in the power supply system also includes a single-pole double-throw disconnector and a circuit breaker with an electric operating mechanism, used to control the switching between the working power supply and the backup power supply.

6. A host power supply method, characterized in that, Includes the following steps: S1: During normal operation, the working power supply provides power to the load in this section; S2: When the power supply fails, the power supply will be automatically restarted first; S3: If the working power supply fails to restart, the primary backup power supply will be automatically activated. S4: If the primary backup power supply fails to start, the secondary backup power supply will be automatically started. S5: If the secondary backup power supply fails to start, the tertiary backup power supply will be automatically started. S6: Provides manual switching function when the third-level backup power supply fails to start; S7: When the backup power supply is occupied, the unoccupied backup power supplies will be started in order of priority. If the primary backup power supply is occupied, the secondary backup power supply will be started first; if the secondary backup power supply is occupied, the tertiary backup power supply will be started.

7. A host power supply method according to claim 6, characterized in that, When the working section cabinet fails, the third-level backup power supply takes priority and is automatically switched on to supply power to the load in this section.

8. A host power supply method according to claim 7, characterized in that, When the backup power supply of a certain section is completely occupied, a backup power supply is manually operated to run the load of two sections at the same time.

9. A host power supply method according to claim 8, characterized in that, This method executes different logic responses for different power protection types, specifically including: When the working power supply experiences output current protection, the backup power supply will be automatically switched according to priority. When the working power supply experiences water flow protection, if the cooling water flow is less than a certain value, an alarm will be triggered and the machine will be shut down for protection. If the cooling water flow fails to recover, the backup power supply will be automatically started according to priority. When the working power supply experiences an input power failure protection event, if it is not restored within a certain period of time, the backup power supply will be automatically started according to priority. When other types of protection occur, if the working power supply fails to be restored, the backup power supply will be automatically started according to priority.

10. A host power supply method according to claim 9, characterized in that, After a power protection action is triggered, the working power supply will attempt to restart automatically. If the restart fails after 3 attempts, the backup power supply will be automatically started according to priority. The working power supply is considered successful only if it runs normally for 1 minute after restarting. After that, the number of attempts and time will be reset and recalculated.

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