Hand-in-hand power supply system

Abstract

The utility model relates to a hand-in-hand power supply system. The system comprises a first high-voltage bus, a second high-voltage bus, a working power supply, a standby power supply, a hand-held power supply, a first microcomputer synchronous switching device, a second microcomputer synchronous switching device, a first high-voltage switch, a second high-voltage switch, a third high-voltage switch, a first voltage transformer, a second voltage transformer and a third voltage transformer. According to the embodiment of the invention, undisturbed switching of the high-voltage power supply of the plant load can be realized, namely the high-voltage power supply of the plant load can be switched among the working power supply, the standby power supply and the hand-held power supply in an undisturbed manner; as the factory load can maintain normal power supply and operation without operation such as shutdown, switching and re-input, the equipment safety risk and the personnel injury risk are reduced, and as the factory equipment does not need to be shut down, the production efficiency is improved.

Description

Technical Field

[0001] This disclosure relates to the field of power plant technology, and more specifically, to a tandem power supply system. Background Technology

[0002] Large power plants typically have two or more generator units, each equipped with a 6kV plant auxiliary power system to supply power to the plant transformers and high- and low-voltage auxiliary equipment. During operation, the 6kV busbar supplies power from the generator output via the plant transformer. When the unit is shut down, if continued power is needed for equipment maintenance, repairs, lighting, or other plant utilities, the power is supplied from the grid busbar via a backup switch to the 6kV busbar. When power plants use the grid bus for power supply, the following shortcomings exist: 1. The purchased electricity load is large and the price is high, increasing the operating costs of enterprises; 2. After a unit is shut down, the common plant load power supply of the shut-down unit is transferred to the operating unit. During the switching process, the load switching of low-voltage transformers such as heat pump transformers, water island transformers, and common transformers is also involved. When operating personnel perform load switching, they need to consider load redistribution, which is difficult to implement and involves a large workload; 3. The process of transferring the common plant load power supply of the shut-down unit to the operating unit involves the shutdown and commissioning of 6kV bus, low-voltage transformers, and 380V low-voltage bus. The operation is complex, and the safety risks during electrical switching operations are high, which may lead to personal injury, equipment damage, and other accidents. Utility Model Content

[0003] The purpose of this disclosure is to provide a tandem power supply system that enables seamless switching of high-voltage power supply for plant loads. Specifically, the high-voltage power supply for plant loads can seamlessly switch between the working power supply (first generator set), the backup power supply (public grid high-voltage power supply), and the tandem power supply (second generator set). When the working power supply fails or is under maintenance, the plant loads can maintain normal power supply and operation without the need for shutdown, switching, or restarting operations. This reduces equipment safety risks and personnel injury risks. Since the plant equipment does not need to be shut down, production efficiency is improved.

[0004] To achieve the above objectives, this disclosure provides a tandem power supply system, which includes: a first high-voltage busbar, a second high-voltage busbar, a working power supply, a backup power supply, a tandem power supply, a first microcomputer synchronization switching device, a second microcomputer synchronization switching device, a first high-voltage switch, a second high-voltage switch, a third high-voltage switch, a first voltage transformer, a second voltage transformer, and a third voltage transformer.

[0005] The first high-voltage switch and the first voltage transformer are connected in series between the first high-voltage bus and the first port of the first microcomputer synchronous switching device.

[0006] The second high-voltage switch and the second voltage transformer are connected in series between the first high-voltage bus and the second port of the first microcomputer synchronous switching device.

[0007] The third high-voltage switch and the third voltage transformer are connected in series between the first high-voltage bus and the second port of the second microcomputer synchronous switching device.

[0008] The second port of the first microcomputer synchronization switching device is connected to the first port of the second microcomputer synchronization switching device;

[0009] The power supply is connected to the first high-voltage bus via the first high-voltage switch;

[0010] The backup power supply is connected to the first high-voltage bus via the second high-voltage switch;

[0011] The hand-in-hand power supply is connected to the second high-voltage bus, and the second high-voltage bus is connected to the first high-voltage bus through the third high-voltage switch.

[0012] Optionally, the system further includes a fourth high-voltage switch;

[0013] The fourth high-voltage switch is connected in series between the second high-voltage bus and the third high-voltage switch.

[0014] Optionally, the system further includes: a first fuse, a second fuse, and a third fuse;

[0015] The first fuse is connected in series between the first high-voltage switch and the first voltage transformer;

[0016] The second fuse is connected in series between the second high-voltage switch and the second voltage transformer;

[0017] The third fuse is connected in series between the third high-voltage switch and the third voltage transformer.

[0018] Optionally, the system further includes a low-voltage transformer;

[0019] The low-voltage transformer is connected to the first high-voltage bus.

[0020] Optionally, the system further includes a high-voltage load;

[0021] The high-voltage load is connected to the first high-voltage bus.

[0022] Optionally, the first microcomputer synchronization switching device is used to detect any one of the electrical parameters among the voltage amplitude, phase sequence, frequency and phase of the working power supply and the backup power supply, and when the electrical parameters of the working power supply and the backup power supply are consistent, to control the opening and closing state of the first high-voltage switch and the second high-voltage switch to switch the working power supply or the backup power supply to supply power to the first high-voltage bus.

[0023] Optionally, the second microcomputer synchronization switching device is used to detect any one of the electrical parameters among the voltage amplitude, phase sequence, frequency and phase of the tandem power supply and the backup power supply, and when the electrical parameters of the tandem power supply and the backup power supply are consistent, to control the opening and closing state of the second high-voltage switch and the third high-voltage switch, so as to switch the tandem power supply or the backup power supply to supply power to the first high-voltage bus.

[0024] Optionally, the power supply includes a first generator set.

[0025] Optionally, the backup power supply includes public grid power.

[0026] Optionally, the hand-in-hand power supply includes a second generator set.

[0027] In summary, this disclosure provides a tandem power supply system, comprising: a first high-voltage busbar, a second high-voltage busbar, a working power supply, a backup power supply, a tandem power supply, a first microcomputer synchronization switching device, a second microcomputer synchronization switching device, a first high-voltage switch, a second high-voltage switch, a third high-voltage switch, a first voltage transformer, a second voltage transformer, and a third voltage transformer; the first high-voltage switch and the first voltage transformer are sequentially connected in series between the first high-voltage busbar and the first port of the first microcomputer synchronization switching device; the second high-voltage switch and the second voltage transformer are sequentially connected in series between the first high-voltage busbar and the second port of the first microcomputer synchronization switching device; the third high-voltage switch and the third voltage transformer are sequentially connected in series between the first high-voltage busbar and the second port of the second microcomputer synchronization switching device; the second port of the first microcomputer synchronization switching device is connected to the first port of the second microcomputer synchronization switching device; the working power supply is connected to the first high-voltage busbar through the first high-voltage switch; the backup power supply is connected to the first high-voltage busbar through the second high-voltage switch; the tandem power supply is connected to the second high-voltage busbar, and the second high-voltage busbar is connected to the first high-voltage busbar through the third high-voltage switch. The embodiments disclosed herein enable seamless switching of high-voltage power supply for plant loads. Specifically, the high-voltage power supply for plant loads can seamlessly switch between the working power supply (first generator set), the backup power supply (public grid high-voltage power supply), and the tandem power supply (second generator set). When the working power supply fails or is under maintenance, the plant loads can maintain normal power supply and operation without the need for shutdown, switching, or reconnection operations. This reduces equipment safety risks and personnel injury risks. Since the plant equipment does not need to be shut down, production efficiency is improved.

[0028] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0029] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0030] Figure 1 This is a schematic diagram of a hand-in-hand power supply system according to an exemplary embodiment.

[0031] Figure 2 This is a schematic diagram of a hand-in-hand power supply system according to an exemplary embodiment.

[0032] Figure 3 This is a schematic diagram of a hand-in-hand power supply system according to an exemplary embodiment.

[0033] Figure 4 This is a schematic diagram of a hand-in-hand power supply system according to an exemplary embodiment.

[0034] Figure 5 This is a schematic diagram of a hand-in-hand power supply system according to an exemplary embodiment. Detailed Implementation

[0035] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0036] It should be noted that the microcomputer synchronization switching device in this disclosure is prior art and can be obtained commercially.

[0037] It should be understood that the term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". Definitions of other terms will be given in the following description.

[0038] It should be noted that the concepts of "first," "second," etc., mentioned in this disclosure are used only to distinguish different devices, modules, or units, and are not used to limit the order of functions performed by these devices, modules, or units or their interdependencies. The modifiers "a" and "a plurality of" mentioned in this disclosure are illustrative rather than restrictive, and those skilled in the art should understand that, unless explicitly stated in the context, they should be understood as "one or more." In the description of this disclosure, unless otherwise stated, "a plurality of" means two or more, and other quantifiers are similar; "at least one," "one or more," or similar expressions refer to any combination of these items, including any combination of single or multiple items.

[0039] Although operations or steps are described in a specific order in the accompanying drawings in the embodiments of this disclosure, it should not be construed as requiring these operations or steps to be performed in the specific order or serial order shown, or requiring all of the shown operations or steps to be performed to obtain the desired result. In the embodiments of this disclosure, these operations or steps may be performed serially; they may be performed in parallel; or a portion of these operations or steps may be performed.

[0040] The names of messages or information exchanged between multiple devices in the embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of these messages or information. It is understood that before using the technical solutions disclosed in the embodiments of this disclosure, users should be informed of the types, scope of use, and usage scenarios of the personal information involved in this disclosure in an appropriate manner in accordance with relevant laws and regulations, and user authorization should be obtained.

[0041] First, the application scenarios of this disclosure will be explained. Large power plants typically have two or more generator units, each equipped with a 6kV plant auxiliary power system to supply power to the plant transformer and high- and low-voltage auxiliary equipment. During unit operation, the 6kV busbar is supplied by the generator output from the unit via the high-voltage plant transformer. When the unit is shut down, power may still be needed for equipment maintenance, repairs, lighting, and other plant utilities. In this case, power is supplied from the grid busbar via a backup switch to the 6kV busbar.

[0042] When power plants use the grid bus for power supply, the following shortcomings exist: 1. The purchased electricity load is large and the price is high, increasing the operating costs of enterprises; 2. After a unit is shut down, the common plant load power supply of the shut-down unit is transferred to the operating unit. During the switching process, the load switching of low-voltage transformers such as heat pump transformers, water island transformers, and common transformers is also involved. When operating personnel perform load switching, they need to consider load redistribution, which is difficult to implement and involves a large workload; 3. The process of transferring the common plant load power supply of the shut-down unit to the operating unit involves the shutdown and commissioning of 6kV bus, low-voltage transformers, and 380V low-voltage bus. The operation is complex, and the safety risks during electrical switching operations are high, which may lead to personal injury, equipment damage, and other accidents.

[0043] Therefore, there is an urgent need for a daisy-chain power supply system to solve the aforementioned practical problems, reduce safety risks to plant equipment and personnel injury risks, and improve production efficiency. The present disclosure will be described below with reference to specific embodiments.

[0044] Figure 1 This is a schematic diagram illustrating a tethered power supply system according to an exemplary embodiment. For example... Figure 1 As shown, this embodiment of the disclosure provides a tandem power supply system, which includes: a first high-voltage bus, a second high-voltage bus, a working power supply 1, a backup power supply 2, a tandem power supply 3, a first microcomputer synchronization switching device Q1, a second microcomputer synchronization switching device Q2, a first high-voltage switch K1, a second high-voltage switch K2, a third high-voltage switch K3, a first voltage transformer PT1, a second voltage transformer PT2, and a third voltage transformer PT3.

[0045] The first high-voltage switch K1 and the first voltage transformer PT1 are connected in series between the first high-voltage bus and the first port of the first microcomputer synchronization switching device Q1. The second high-voltage switch K2 and the second voltage transformer PT2 are connected in series between the first high-voltage bus and the second port of the first microcomputer synchronization switching device Q1. The third high-voltage switch K3 and the third voltage transformer PT3 are connected in series between the first high-voltage bus and the second port of the second microcomputer synchronization switching device Q2.

[0046] The second port of the first microcomputer synchronization switching device Q1 is connected to the first port of the second microcomputer synchronization switching device Q2. The working power supply 1 is connected to the first high-voltage bus via the first high-voltage switch K1. The backup power supply 2 is connected to the first high-voltage bus via the second high-voltage switch K2. The tandem power supply 3 is connected to the second high-voltage bus, and the second high-voltage bus is connected to the first high-voltage bus via the third high-voltage switch K3. For example, either the first or second high-voltage bus can be a 6kV high-voltage bus.

[0047] The first microcomputer synchronization switching device Q1 is used to detect any one of the electrical parameters among the voltage amplitude, phase sequence, frequency and phase of the working power supply 1 and the backup power supply 2, and when the electrical parameters of the working power supply 1 and the backup power supply 2 are consistent, it controls the opening and closing state of the first high-voltage switch K1 and the second high-voltage switch K2 to switch the working power supply 1 or the backup power supply 2 to supply power to the first high-voltage bus.

[0048] The second microcomputer synchronous switching device Q2 is used to detect any one of the electrical parameters among the voltage amplitude, phase sequence, frequency and phase of the tandem power supply 3 and the backup power supply 2, and when the electrical parameters of the tandem power supply 3 and the backup power supply 2 are consistent, it controls the opening and closing states of the second high-voltage switch K2 and the third high-voltage switch K3 to switch the tandem power supply 3 or the backup power supply 2 to supply power to the first high-voltage bus.

[0049] Among them, the working power source 1 can be the first generator set, the backup power source 2 can be the public grid power source, and the tandem power source 3 can be the second generator set.

[0050] The system operates as follows: Under normal circumstances, the first high-voltage switch K1 is closed, and the first high-voltage bus is powered by the working power source 1 (usually the plant's first generator set), driving the plant's auxiliary equipment (not shown in the diagram) to operate normally. When the working power source 1 fails or is under maintenance, the first microcomputer synchronization switching device Q1 controls the second high-voltage switch K2 to close first, and then opens the first high-voltage switch K1. In this way, the first high-voltage bus is powered by the backup power source 2, driving the plant's auxiliary equipment to operate normally. However, since the backup power source 2 generally uses public grid power, which needs to be purchased by the power plant at a high cost, it cannot be used for a long time. Therefore, the first high-voltage bus needs to be further switched to the tandem power source 3 (usually the plant's second generator set) for power supply. At this time, when the second microcomputer synchronization switching device Q2 detects that the electrical parameters (including voltage amplitude, phase, frequency, and phase sequence) of the backup power source 2 and the tandem power source 3 are consistent, it controls the third high-voltage switch K3 to close first, and then opens the second high-voltage switch K2, so as to achieve a seamless switching between the backup power source 2 and the tandem power source 3. In this way, since normal power supply and operation can be maintained without the need for plant load to be shut down, switched, and restarted, the risks to equipment safety and personnel injury are reduced. Since plant equipment does not need to be shut down, production efficiency is also improved.

[0051] In summary, this disclosure provides a tandem power supply system, comprising: a first high-voltage busbar, a second high-voltage busbar, a working power supply, a backup power supply, a tandem power supply, a first microcomputer synchronization switching device, a second microcomputer synchronization switching device, a first high-voltage switch, a second high-voltage switch, a third high-voltage switch, a first voltage transformer, a second voltage transformer, and a third voltage transformer; the first high-voltage switch and the first voltage transformer are sequentially connected in series between the first high-voltage busbar and the first port of the first microcomputer synchronization switching device; the second high-voltage switch and the second voltage transformer are sequentially connected in series between the first high-voltage busbar and the second port of the first microcomputer synchronization switching device; the third high-voltage switch and the third voltage transformer are sequentially connected in series between the first high-voltage busbar and the second port of the second microcomputer synchronization switching device; the second port of the first microcomputer synchronization switching device is connected to the first port of the second microcomputer synchronization switching device; the working power supply is connected to the first high-voltage busbar through the first high-voltage switch; the backup power supply is connected to the first high-voltage busbar through the second high-voltage switch; the tandem power supply is connected to the second high-voltage busbar, and the second high-voltage busbar is connected to the first high-voltage busbar through the third high-voltage switch. The embodiments disclosed herein enable seamless switching of high-voltage power supply for plant loads. Specifically, the high-voltage power supply for plant loads can seamlessly switch between the working power supply (first generator set), the backup power supply (public grid high-voltage power supply), and the tandem power supply (second generator set). When the working power supply fails or is under maintenance, the plant loads can maintain normal power supply and operation without the need for shutdown, switching, or reconnection operations. This reduces equipment safety risks and personnel injury risks. Since the plant equipment does not need to be shut down, production efficiency is improved.

[0052] Figure 2 This is a schematic diagram illustrating a tethered power supply system according to an exemplary embodiment. For example... Figure 2 As shown, the system may also include a fourth high-voltage switch K4.

[0053] The fourth high-voltage switch K4 is connected in series between the second high-voltage bus and the third high-voltage switch K3. The presence of the fourth high-voltage switch K4 prevents potential damage caused by the accidental closing of the third high-voltage switch K3. If the electrical parameters of the backup power supply 2 and the tandem power supply 3 are inconsistent (e.g., inconsistent voltage amplitude, voltage phase, frequency, or phase sequence), then closing the third high-voltage switch K3 while the second high-voltage switch K2 is closed would cause a serious accident. Therefore, the correct operating sequence is to first close the fourth high-voltage switch K4, then have the second microcomputer synchronization switching device Q2 determine the correct timing (when the electrical parameters of the backup power supply 2 and the tandem power supply 3 are consistent) to close the third high-voltage switch K3, and finally open the second high-voltage switch K2. This ensures a seamless switching between the backup power supply 2 and the tandem power supply 3.

[0054] Figure 3 This is a schematic diagram illustrating a tethered power supply system according to an exemplary embodiment. For example... Figure 3 As shown, the system may also include: a first fuse D1, a second fuse D2, and a third fuse D3.

[0055] The first fuse D1 is connected in series between the first high-voltage switch K1 and the first voltage transformer PT1. The second fuse D2 is connected in series between the second high-voltage switch K2 and the second voltage transformer PT2. The third fuse D3 is connected in series between the third high-voltage switch K3 and the third voltage transformer PT3. The presence of fuses D1-D3 prevents accidental high-voltage or short-circuit currents in the system from damaging the microcomputer-based synchronous switching devices Q1-Q2.

[0056] Figure 4 This is a schematic diagram illustrating a tethered power supply system according to an exemplary embodiment. For example... Figure 4 As shown, the system may also include a low-voltage transformer B.

[0057] Low-voltage transformer B is connected to the first high-voltage busbar. For example, low-voltage transformer B can be a group of low-voltage transformers, such as heat pump transformers, water island transformers, and utility transformers, which can also supply some 380V AC electrical equipment via a 380V AC busbar.

[0058] Figure 5 This is a schematic diagram illustrating a tethered power supply system according to an exemplary embodiment. For example... Figure 5 As shown, the system may also include a high-voltage load F.

[0059] The high-voltage load F is connected to the first high-voltage busbar. For example, the high-voltage load F can be a high-voltage mechanical load, such as a high-voltage motor, crane, hoist, or other heavy equipment.

[0060] In some embodiments, the first microcomputer synchronous switching device Q1 is used to detect any one of the electrical parameters among the voltage amplitude, phase sequence, frequency and phase of the working power supply 1 and the backup power supply 2, and when the electrical parameters of the working power supply 1 and the backup power supply 2 are consistent, to control the opening and closing state of the first high-voltage switch K1 and the second high-voltage switch K2, so as to switch the working power supply 1 or the backup power supply 2 to supply power to the first high-voltage bus.

[0061] In some embodiments, the second microcomputer synchronous switching device Q2 is used to detect any one of the electrical parameters among the voltage amplitude, phase sequence, frequency and phase of the tandem power supply 3 and the backup power supply 2, and when the electrical parameters of the tandem power supply 3 and the backup power supply 2 are consistent, to control the opening and closing states of the second high-voltage switch K2 and the third high-voltage switch K3, so as to switch the tandem power supply 3 or the backup power supply 2 to supply power to the first high-voltage bus.

[0062] In some embodiments, the operating power source 1 includes a first generator set.

[0063] In some embodiments, the backup power supply 2 includes a public grid power supply.

[0064] In some embodiments, the hand-held power supply 3 includes a second generator set.

[0065] In summary, this disclosure provides a tandem power supply system, comprising: a first high-voltage busbar, a second high-voltage busbar, a working power supply, a backup power supply, a tandem power supply, a first microcomputer synchronization switching device, a second microcomputer synchronization switching device, a first high-voltage switch, a second high-voltage switch, a third high-voltage switch, a first voltage transformer, a second voltage transformer, and a third voltage transformer; the first high-voltage switch and the first voltage transformer are sequentially connected in series between the first high-voltage busbar and the first port of the first microcomputer synchronization switching device; the second high-voltage switch and the second voltage transformer are sequentially connected in series between the first high-voltage busbar and the second port of the first microcomputer synchronization switching device; the third high-voltage switch and the third voltage transformer are sequentially connected in series between the first high-voltage busbar and the second port of the second microcomputer synchronization switching device; the second port of the first microcomputer synchronization switching device is connected to the first port of the second microcomputer synchronization switching device; the working power supply is connected to the first high-voltage busbar through the first high-voltage switch; the backup power supply is connected to the first high-voltage busbar through the second high-voltage switch; the tandem power supply is connected to the second high-voltage busbar, and the second high-voltage busbar is connected to the first high-voltage busbar through the third high-voltage switch. The embodiments disclosed herein enable seamless switching of high-voltage power supply for plant loads. Specifically, the high-voltage power supply for plant loads can seamlessly switch between the working power supply (first generator set), the backup power supply (public grid high-voltage power supply), and the tandem power supply (second generator set). When the working power supply fails or is under maintenance, the plant loads can maintain normal power supply and operation without the need for shutdown, switching, or reconnection operations. This reduces equipment safety risks and personnel injury risks. Since the plant equipment does not need to be shut down, production efficiency is improved.

[0066] In addition, before the first generator unit is disconnected, the first high-voltage bus is switched from working power supply to standby power supply; after the first generator unit is disconnected, there is no need to stop the load and perform complicated switching operations. The first high-voltage bus can be switched from standby power supply to hand-to-hand power supply through the microcomputer synchronization switching device. This not only eliminates the risk of human error operation but also reduces the amount of electricity purchased from the grid, thereby improving the economic efficiency of the unit.

[0067] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0068] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0069] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A hand-in-hand power supply system, characterized in that, The system includes: a first high-voltage busbar, a second high-voltage busbar, a working power supply, a backup power supply, a tandem power supply, a first microcomputer synchronization switching device, a second microcomputer synchronization switching device, a first high-voltage switch, a second high-voltage switch, a third high-voltage switch, a first voltage transformer, a second voltage transformer, and a third voltage transformer. The first high-voltage switch and the first voltage transformer are connected in series between the first high-voltage bus and the first port of the first microcomputer synchronous switching device. The second high-voltage switch and the second voltage transformer are connected in series between the first high-voltage bus and the second port of the first microcomputer synchronous switching device. The third high-voltage switch and the third voltage transformer are connected in series between the first high-voltage bus and the second port of the second microcomputer synchronous switching device. The second port of the first microcomputer synchronization switching device is connected to the first port of the second microcomputer synchronization switching device; The power supply is connected to the first high-voltage bus via the first high-voltage switch; The backup power supply is connected to the first high-voltage bus via the second high-voltage switch; The hand-in-hand power supply is connected to the second high-voltage bus, and the second high-voltage bus is connected to the first high-voltage bus through the third high-voltage switch.

2. The hand-in-hand power supply system according to claim 1, characterized in that, The system also includes a fourth high-voltage switch; The fourth high-voltage switch is connected in series between the second high-voltage bus and the third high-voltage switch.

3. The hand-in-hand power supply system according to claim 1, characterized in that, The system also includes: a first fuse, a second fuse, and a third fuse; The first fuse is connected in series between the first high-voltage switch and the first voltage transformer; The second fuse is connected in series between the second high-voltage switch and the second voltage transformer; The third fuse is connected in series between the third high-voltage switch and the third voltage transformer.

4. The hand-in-hand power supply system according to claim 1, characterized in that, The system also includes a low-voltage transformer; The low-voltage transformer is connected to the first high-voltage bus.

5. The hand-in-hand power supply system according to claim 1, characterized in that, The system also includes a high-voltage load; The high-voltage load is connected to the first high-voltage bus.

6. The hand-in-hand power supply system according to claim 1, characterized in that, The first microcomputer synchronization switching device is used to detect any one of the electrical parameters among the voltage amplitude, phase sequence, frequency and phase of the working power supply and the backup power supply, and when the electrical parameters of the working power supply and the backup power supply are consistent, to control the opening and closing state of the first high-voltage switch and the second high-voltage switch to switch the working power supply or the backup power supply to supply power to the first high-voltage bus.

7. The hand-in-hand power supply system according to claim 1, characterized in that, The second microcomputer synchronization switching device is used to detect any one of the electrical parameters among the voltage amplitude, phase sequence, frequency and phase of the tandem power supply and the backup power supply, and when the electrical parameters of the tandem power supply and the backup power supply are consistent, to control the opening and closing state of the second high-voltage switch and the third high-voltage switch to switch the tandem power supply or the backup power supply to supply power to the first high-voltage bus.

8. The hand-in-hand power supply system according to any one of claims 1-7, characterized in that, The power source includes a first generator set.

9. The hand-in-hand power supply system according to any one of claims 1-7, characterized in that, The backup power source includes public grid power.

10. The hand-in-hand power supply system according to any one of claims 1-7, characterized in that, The hand-in-hand power supply includes a second generator set.

Images