Distributed direct-current power device and power equipment

Abstract

The utility model provides a distributed DC power device and power equipment, and relates to the technical field of power electronics. The distributed direct-current power device comprises a direct-current power supply module, a control module, a switch module and a plurality of driving devices, the direct-current power supply module comprises a plurality of battery units; the switch module comprises a plurality of switch assemblies; each battery unit corresponds to one switch assembly; any battery unit is connected with each driving device through a corresponding switch assembly. Each driving device corresponds to one load; the control module is connected with the control end of each switch assembly. Wherein the control module is used for sending a control instruction to any switch assembly at the same working moment, so that only the battery unit corresponding to the current switch assembly supplies power to the driving device. According to the utility model, the technical problems of complex structure, low redundancy and difficulty in maintenance in the prior art can be solved, and the requirements of various large ships on an electric power system can be met.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of power electronics, especially to a distributed direct current power device and power equipment. BACKGROUND

[0002] In the design of traditional electric ships, the stability, safety and efficiency of the battery system as the core energy supply part directly affect the overall performance and operating cost of the ship. Moreover, the traditional battery management system is mostly designed in a centralized manner, which has the problems of complex structure, low redundancy and difficult maintenance, and is difficult to meet the needs of large ships.

[0003] Therefore, there is an urgent need for a ship power supply scheme to overcome the problems of complex structure, low redundancy and difficult maintenance under the demand of green energy saving, and to adapt to the needs of large ships for power systems. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a distributed direct current power device and power equipment, which can overcome the technical problems of complex structure, low redundancy and difficult maintenance in the prior art, and can meet the needs of various large ships for power systems.

[0005] In a first aspect, the utility model provides a distributed direct current power device applied to a ship equipment, which comprises a direct current power supply module, a control module, a switch module and a plurality of driving devices; the direct current power supply module comprises a plurality of battery units; the switch module comprises a plurality of switch components; each battery unit corresponds to a switch component; for any battery unit, each driving device is connected through the corresponding switch component; the control module is connected with the control end of each switch component;

[0006] The control module is used to send a control instruction to any switch component at the same working time, so as to supply power to the driving device only through the battery unit corresponding to the current switch component.

[0007] Optionally, the switch module comprises a plurality of power supply buses, and each power supply bus supplies power to one driving device;

[0008] Any switch component comprises a plurality of switch tubes, the first end of each switch tube is connected with the output end of the direct current power supply module; the second end of each switch tube is connected with one of the power supply buses, and the second end of each switch tube is connected with a different power supply bus;

[0009] The number of power supply buses is the same as the number of switch tubes.

[0010] Optionally, the direct current power supply module further comprises a direct current charging unit, the direct current charging unit is electrically connected with each battery unit, and the control end of the direct current charging unit is further connected with the control module.

[0011] The control module is configured to send a control instruction to the DC charging unit at the same working time to supply power to any battery unit through the DC charging unit.

[0012] Optionally, for any driving device, a fuse and a circuit breaker are connected in series; one end of the series connection of the fuse and the circuit breaker is connected to the corresponding power supply bus; and the other end is connected to the corresponding driving device.

[0013] Optionally, in the ship equipment, the AC bus includes a bus tie switch, and the bus tie switch is in a normally closed state; a first AC bus is the AC bus corresponding to the first end of the bus tie switch; a second AC bus is the AC bus corresponding to the second end of the bus tie switch; and the distributed DC power device further includes an AC power supply module, which at least includes a main power supply unit and an auxiliary power supply unit.

[0014] The main power supply unit and the auxiliary power supply unit are respectively connected through the first AC bus and the second AC bus; and control ends of the main power supply unit and the auxiliary power supply unit are connected to the control module.

[0015] The control module is configured to send a control instruction to the main power supply unit and / or the auxiliary power supply unit to switch the access state of the main power supply unit and / or the auxiliary power supply unit.

[0016] Optionally, in the case that the AC power supply module further includes a photovoltaic power supply unit, the main power supply unit and the auxiliary power supply unit each include a daily-use inverter and a transformer; an output end of the daily-use inverter is connected to an input end of the transformer; an output end of the transformer is connected to the AC bus; an input end of the daily-use inverter is connected to a power supply bus of the switch module; and an output end of the photovoltaic power supply unit is connected to the AC bus.

[0017] Optionally, the photovoltaic power supply unit includes a photovoltaic power generation panel and a photovoltaic inverter; an output end of the photovoltaic power generation panel is connected to an input end of the photovoltaic inverter; and an output end of the photovoltaic inverter is connected to the AC bus.

[0018] Optionally, the AC power supply module further includes a plurality of circuit breakers; the output end of the photovoltaic power supply unit and one end of the series connection of the daily-use inverter and the transformer are each connected to the AC bus through one circuit breaker.

[0019] Optionally, the AC power supply module further includes an AC shore power box; and the AC shore power box is connected to the AC bus.

[0020] In a second aspect, the utility model also provides a kind of electric power equipment, including the distributed DC power device of any one of the above first aspect.

[0021] The utility model provides a kind of distributed direct current power device and power equipment, with following beneficial effects:

[0022] The utility model discloses a distributed direct current power device is applied to ship equipment, including direct current power supply module, control module, switch module and multiple drive devices;Direct current power supply module includes multiple battery units;Switch module includes multiple switch components;Each battery unit is correspondingly one switch component;For any battery unit, it is connected with each drive device by corresponding switch component respectively;Each drive device corresponds one load;Control module is connected with the control end of each switch component. Among them, control module is used to send control instruction to any switch component under same working time, to only pass through the battery unit corresponding to current switch component and power supply for drive device. Based on this, the distributed direct current power device provided by the utility model can overcome the technical problems of complex structure, low redundancy and difficult maintenance in the prior art, and can meet the demand of various large ships on power system. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the specific embodiment of the utility model or the technical scheme in the prior art, the drawings needed to be used in the specific embodiment or the prior art description will be briefly introduced as follows. Obviously, the drawings described below are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0024] Figure 1 One of the module structure diagrams of the distributed direct current power device provided by the utility model embodiment is provided;

[0025] Figure 2 The module structure diagram of the switch module in the utility model embodiment is provided;

[0026] Figure 3 One of the circuit principle diagrams of the distributed direct current power device in the utility model embodiment is provided;

[0027] Figure 4 The second module structure diagram of the distributed direct current power device provided by the utility model embodiment is provided;

[0028] Figure 5 The second circuit principle diagram of the distributed direct current power device in the utility model embodiment is provided;

[0029] Figure 6 The third module structure diagram of the distributed direct current power device provided by the utility model embodiment is provided;

[0030] Figure 7 The fourth module structure diagram of the distributed direct current power device provided by the utility model embodiment is provided.

[0031] Figure 8 It is the structure schematic view of AC power supply module in the utility model embodiment;

[0032] Figure 9 It is the structure schematic view of photovoltaic power supply unit in the utility model embodiment;

[0033] Figure 10 It is the third circuit principle diagram of distributed direct current power device in the utility model embodiment.

[0034] Icon: 10-distributed direct current power device;101-direct current power supply module;102-control module;103-switch module;104-driving device;105-AC power supply module;201-battery unit;202-switch assembly;203-power supply bus;205-switch tube;206-direct current charging unit;207-main power supply unit;208-assistant power supply unit;301-first battery unit;302-second battery unit;303-third battery unit;401-first switch assembly;402-second switch assembly;403-third switch assembly;501-first driving device;502-second driving device;503-third driving device;601-photovoltaic power supply unit;602-daily inverter;603-transformer;K1-first switch tube;K2-second switch tube;K3-third switch tube;K4-fourth switch tube;K5-fifth switch tube;K6-sixth switch tube;K7-seventh switch tube;K8-eighth switch tube;K9-ninth switch tube;A1-first power supply bus;A2-second power supply bus;A3-third power supply bus;AC1-first AC bus;AC2-second AC bus;PV-photovoltaic power generation board;PV-INV-photovoltaic inverter;AC-SC-AC shore power box;DC-SC-direct current shore power box;INV1-first daily inverter;MT1-first transformer;INV2-second daily inverter;MT2-second transformer. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantage of the utility model embodiment more clear, the technical scheme in the utility model embodiment will be described clearly and completely below with the drawings in the utility model embodiment, obviously, the described embodiment is a part of the embodiment of the utility model, rather than all the embodiment. The components of the utility model embodiment described and shown in the drawings here can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the application.

[0037] It should be noted that similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0038] In the description of the application, it should be noted that the terms "first", "second", "third" and the like are only used to distinguish description, and cannot be understood as indicating or implying relative importance.

[0039] In the description of the application, it should also be noted that unless otherwise specified and limited, the term "connection" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above-mentioned terms in the application can be understood according to the specific circumstances.

[0040] Some embodiments of the application will be described in detail below with reference to the accompanying drawings. In the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

[0041] As described in the background, the traditional battery management system mostly adopts centralized design, which has problems such as complex structure, low redundancy, difficult maintenance, etc., and is difficult to meet the needs of large ships for high reliability and high flexibility.

[0042] Based on this, the application provides a ship power supply scheme to overcome the above technical problems.

[0043] The following will introduce in detail the ship power supply scheme provided by the application, that is, a distributed direct current power device and a power equipment.

[0044] Please refer to Figure 1 , Figure 1A module structure diagram of a distributed direct-current power device is shown in the embodiment; the distributed direct-current power device 10 is applied to a ship equipment, and at least includes: a direct-current power supply module 101, a control module 102, a switch module 103, and a plurality of driving devices 104; the direct-current power supply module 101 includes a plurality of battery units 201; the switch module 103 includes a plurality of switch assemblies 202; each battery unit 201 corresponds to one switch assembly 202 respectively; for any battery unit 201, each driving device 104 is connected through the corresponding switch assembly 202 respectively; the control module 102 is connected with the control end of each switch assembly 202.

[0045] The control module 102 is configured to send a control instruction to any switch assembly 202 at the same working time, so as to supply power to the driving device 104 through only the battery unit 201 corresponding to the current switch assembly 202.

[0046] In the embodiment, each battery unit of the distributed direct-current power device corresponds to one switch assembly, that is, the battery units are completely independent and are not connected in series or in parallel, so that the stability and safety of power supply are ensured, and the interference of a single fault on the entire ship equipment power system is reduced. The control module sends a control instruction to any switch assembly, so as to supply power to the driving device through only the battery unit corresponding to the current switch assembly, that is, a one-to-one power supply relationship is adopted, that is, a specific battery group supplies power to the driving device in the same time period, so that the rational use of power resources and the stable operation of the equipment are ensured.

[0047] In order to reduce the structural complexity, improve the operation efficiency and detection efficiency, the switch assembly in the embodiment can adopt a direct-current switch cabinet, and each direct-current switch cabinet is adjusted through the control module. In a possible implementation manner, the control module can adopt a power management system (PMS), so as to accurately adjust the turn-on and / or turn-off of the direct-current switch cabinet, and realize the switching between the battery unit and the driving device.

[0048] Please refer to Figure 1 on the basis of Figure 2 , Figure 2 A module structure diagram of the switch module in the embodiment is shown, and the switch module 103 further includes a plurality of power supply buses 203, each power supply bus 203 supplies power to one driving device 104.

[0049] Any switch assembly 202 includes a plurality of switch tubes 205, and the first end of each switch tube 205 is connected with the output end of the corresponding battery unit 201 under the direct-current power supply module; the second end of each switch tube 205 is connected with one of the power supply buses 203 respectively, and the second end of each switch tube 205 is connected with different power supply buses 203.

[0050] In the embodiment, each switch assembly 202 includes a plurality of switch tubes 205, each of which is connected to a power supply bus 203, and correspondingly, different power supply buses 203 correspond to a driving device 104 respectively, so that in the same switch assembly 202, through the control instruction of the control module 102, only the corresponding driving device 104 is turned on after any switch tube 205 is turned on, and through the one-to-one power supply relationship, the specific battery pack is realized to supply power to only one DC load.

[0051] In the embodiment, each switch assembly 202 is independent of each other between different switch tubes 205, and does not interfere with each other. Each power supply bus 203 is connected to the corresponding battery unit 201 through the corresponding number of switch tubes 205.

[0052] It should be noted that in the embodiment, the number of power supply buses 203 is the same as the number of switch tubes 205.

[0053] In a possible implementation manner, on the basis of Figure 2 , reference is made to Figure 3 , Figure 3 a circuit schematic diagram of the distributed DC power device is shown; when the number of battery units 201 is 3, correspondingly, the number of switch assemblies 202 is also 3, when the number of switch tubes 205 is 3, the number of power supply buses 203 is also 3, for the convenience of description, the three battery units 201 are respectively represented as a first battery unit 301, a second battery unit 302 and a third battery unit 303; the three switch assemblies 202 are also represented as a first switch assembly 401, a second switch assembly 402 and a third switch assembly 403; wherein the first switch assembly 401 includes a first switch tube K1, a second switch tube K2 and a third switch tube K3; the second switch assembly 402 includes a fourth switch tube K4, a fifth switch tube K5 and a sixth switch tube K6; the third switch assembly 403 includes a seventh switch tube K7, an eighth switch tube K8 and a ninth switch tube K9. Correspondingly, the three power supply buses 203 are respectively represented as a first power supply bus A1, a second power supply bus A2 and a third power supply bus A3.

[0054] Among them, the first battery unit 301 is connected to the first end of the first switch tube K1, the second switch tube K2 and the third switch tube K3 respectively; the second end of the first switch tube K1 is connected to the first power supply bus A1; the second end of the second switch tube K2 is connected to the second power supply bus A2; the second end of the third switch tube K3 is connected to the third power supply bus A3. Among them, the first power supply bus A1, the second power supply bus A2 and the third power supply bus A3 supply power to different driving devices 104 respectively.

[0055] Similarly to the first battery unit 301, the second battery unit 302 is connected with the first end of the fourth switch tube K4, the fifth switch tube K5 and the sixth switch tube K6 respectively; the second end of the fourth switch tube K4 is connected with the first power supply bus A1; the second end of the fifth switch tube K5 is connected with the second power supply bus A2; and the second end of the sixth switch tube K6 is connected with the third power supply bus A3.

[0056] Similarly to the first battery unit 301, the third battery unit 303 is connected with the first end of the seventh switch tube K7, the eighth switch tube K8 and the ninth switch tube K9 respectively; the second end of the seventh switch tube K7 is connected with the first power supply bus A1; the second end of the eighth switch tube K8 is connected with the second power supply bus A2; and the second end of the ninth switch tube K9 is connected with the third power supply bus A3.

[0057] Based on this, the embodiment realizes that a single battery unit supplies power for a driving device through the control module, simplifies the structure of the direct current power distribution system and provides power supply efficiency.

[0058] In the embodiment, for any driving device 104, a fuse and a circuit breaker connected in series are included; one end of the fuse and the circuit breaker connected in series is connected with the corresponding power supply bus 203; and the other end is connected with the corresponding driving device 104.

[0059] Please continue to refer to Figure 3 On the basis of including three power supply buses 203, when three driving devices 104 are included, the three driving devices are respectively represented as a first driving device 501, a second driving device 502 and a third driving device 503; the first driving device 501 is connected with the first power supply bus; the second driving device 502 is connected with the second power supply bus; and the third driving device 503 is connected with the third power supply bus.

[0060] Among them, each driving device is connected with the corresponding power supply bus through the fuse and the circuit breaker connected in series.

[0061] In order to avoid the loss of battery unit power, in the embodiment, on the basis of Figure 1 , please refer to Figure 4 , Figure 4 Another structural schematic diagram of the distributed direct current power device is shown; in the embodiment, the direct current power supply module 101 further includes a direct current charging unit 206; the direct current charging unit 206 is electrically connected with each battery unit 201; and the control end of the direct current charging unit 206 is further connected with the control module 102.

[0062] Among them, the control module 102 is used to send a control instruction to the direct current charging unit 206 at the same working time, so as to supply power for any battery unit 201 through the direct current charging unit 206.

[0063] To simplify the structure of DC power distribution systems, Figure 2 Based on this, please refer to Figure 5 , Figure 5 Another circuit diagram of a distributed DC power device is shown. In this embodiment, the DC charging unit 206 can be connected to any power supply bus 203 via a circuit breaker to charge any battery unit 201 through the current power supply bus 203. In this embodiment, the DC charging unit 206 can be a DC shore power box (DC-SC).

[0064] To meet the needs of large ship equipment, in this embodiment, the drive device 104 can supply power to at least the main propulsion device and the bow propulsion device. When the large ship equipment includes propulsion devices on both the left and right sides, that is, the left main propulsion device, the bow propulsion device and the right main propulsion device, the left main propulsion device, the bow propulsion device and the right main propulsion device can all be powered one-to-one by the drive device 104.

[0065] Please Figure 6 On this basis, Figure 6 This diagram illustrates another module structure of the distributed DC power device. For convenient power supply, in this embodiment, the components such as the battery units 201 under the distributed DC power device 10 are divided into a left power supply component and a right power supply component, according to the equipment requiring power in the left and right propulsion devices. Both the left and right power supply components include the aforementioned DC power supply module 101, control module 102, and switch module 103, so that the left and right power supply components respectively supply power to the aforementioned equipment requiring power. The specific connection relationship is consistent with the previous embodiment and will not be repeated here. To simplify the device structure, a single DC charging unit 206 can supply power to both the right and left power supply components.

[0066] In this embodiment, when the AC busbar in the ship's equipment includes a bus tie switch, and the bus tie switch is in a normally closed state, the AC busbar corresponding to the first end closest to the bus tie switch is designated as the first AC busbar AC1; when the AC busbar corresponding to the second end closest to the bus tie switch is designated as the second AC busbar AC2, please... Figure 1 Based on, refer to Figure 7 , Figure 7 This diagram illustrates another structural feature of the distributed DC power device in this embodiment. The distributed DC power device 10 further includes an AC power supply module 105, which includes at least a main power supply unit 207 and an auxiliary power supply unit 208. The main power supply unit 207 is connected to the first AC bus AC1, and the auxiliary power supply unit 208 is connected to the second AC bus AC2. The control terminals of both the main power supply unit 207 and the auxiliary power supply unit 208 are connected to the control module 102.

[0067] The control module 102 is configured to send control instructions to the main power supply unit 207 and / or the auxiliary power supply unit 208 to switch the access state of the main power supply unit 207 and / or the auxiliary power supply unit 208.

[0068] When the large ship equipment includes left and right propulsion devices, i.e., a left main propulsion device, a bow side propulsion device, and a right main propulsion device, two sets of power supply units can be used to supply power to the AC bus in the large ship equipment, and one of the two sets of power supply units is used as the main power supply unit, and the other set is used as the auxiliary power supply unit, i.e., the main power supply unit and the auxiliary power supply unit are used to supply power to the left propulsion device and / or the right propulsion device.

[0069] Please refer to Figure 7 on the basis of Figure 8 , Figure 8 The structure of the AC power supply module in the embodiment is shown in the schematic diagram. In the condition that the AC power supply module 105 further includes the photovoltaic power supply unit 601, the main power supply unit 207 and the auxiliary power supply unit 208 each include a daily-use inverter 602 and a transformer 603, the output end of the daily-use inverter 602 is connected to the input end of the transformer 603; the output end of the transformer 603 is connected to the AC bus; the input end of the daily-use inverter 602 is connected to the power supply bus 203; and the output end of the photovoltaic power supply unit 601 is connected to the AC bus.

[0070] In the embodiment, please refer to Figure 9 , Figure 9 The structure of the photovoltaic power supply unit in the embodiment is shown in the schematic diagram. The photovoltaic power supply unit 601 includes a photovoltaic power generation panel PV and a photovoltaic inverter PV-INV; the output end of the photovoltaic power generation panel PV is connected to the input end of the photovoltaic inverter PV-INV; and the output end of the photovoltaic inverter PV-INV is connected to the AC bus.

[0071] The AC power supply module further includes a plurality of circuit breakers. One end of the output end of the photovoltaic power supply unit, the daily-use inverter, and the transformer connected in series is connected to the AC bus through one circuit breaker.

[0072] Please continue to refer to Figure 8 In the embodiment, the AC power supply module further includes an AC shore power box AC-SC, and the AC shore power box AC-SC is connected to the AC bus.

[0073] Based on this, please refer to Figure 10 , Figure 10 Another circuit principle diagram of the distributed DC power device is shown. In the diagram, the daily-use inverter and the transformer under the main power supply unit 207 are denoted as a first daily-use inverter INV1 and a first transformer MT1; and the daily-use inverter and the transformer under the auxiliary power supply unit 208 are denoted as a second daily-use inverter INV2 and a second transformer MT2.

[0074] To sum up, the embodiment provides a kind of distributed direct current power device, including direct current power supply module, control module, switch module and multiple drive devices;Direct current power supply module includes multiple battery units;Switch module includes multiple switch components;Each battery unit is respectively corresponding one switch component;For any battery unit, it is respectively connected with each drive device by corresponding switch component;Each drive device corresponds one load;Control module is connected with the control end of each switch component.Wherein, control module is used to send control instruction to any switch component at the same working time, to only pass through the battery unit corresponding to current switch component to drive device power supply.

[0075] The distributed direct current power device provided by the utility model can overcome the technical problems of complex structure, low redundancy and difficult maintenance in the prior art, and can meet the demand of various large ships for power systems.

[0076] The same as the previous embodiment, the utility model also provides a kind of power equipment, including the distributed direct current power device of any one of the first aspect described above.

[0077] The power equipment can overcome the technical problems of complex structure, low redundancy and difficult maintenance in the prior art, and can meet the demand of various large ships for power systems.

[0078] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the utility model, and not to limit them;Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all technical features;And these modifications or replacements do not make the essence of corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A distributed DC power plant applied to a ship equipment, characterized by, The application relates to a DC power supply module, a control module, a switch module and a plurality of driving devices. The DC power supply module comprises a plurality of battery units; the switch module comprises a plurality of switch components; each battery unit corresponds to a switch component; each driving device is connected to any battery unit through the corresponding switch component; the control module is connected to the control end of each switch component. The control module sends a control instruction to any switch component at the same working time to supply power to the driving device through the battery unit corresponding to the current switch component. The switch module comprises a plurality of power supply buses, each of which supplies power to a driving device.

2. The distributed DC power device of claim 1, wherein, Any switch component comprises a plurality of switch tubes, the first end of each switch tube is connected to the output end of the DC power supply module; the second end of each switch tube is connected to one of the power supply buses; the second end of each switch tube is connected to a different power supply bus. The number of power supply buses is the same as the number of switch tubes. The DC power supply module further comprises a DC charging unit, the DC charging unit is electrically connected to each battery unit, and the control end of the DC charging unit is further connected to the control module.

3. The distributed DC power device according to claim 1 or 2, characterized by The control module sends a control instruction to the DC charging unit at the same working time to supply power to any battery unit through the DC charging unit. Any driving device comprises a fuse and a circuit breaker connected in series; one end of the fuse and the circuit breaker connected in series is connected to the corresponding power supply bus; the other end is connected to the corresponding driving device.

4. The distributed DC power device according to claim 1 or 2, characterized by In the ship equipment, the AC bus comprises a bus tie switch, and the bus tie switch is in a normally closed state; the AC bus corresponding to the first end close to the bus tie switch is a first AC bus; the AC bus corresponding to the second end close to the bus tie switch is a second AC bus; the distributed DC power device further comprises an AC power supply module, the AC power supply module at least comprises a main power supply unit and an auxiliary power supply unit; 5. The distributed DC power device of claim 1 or 2, wherein, The main power supply unit is connected to the first AC bus, and the auxiliary power supply unit is connected to the second AC bus; the control ends of the main power supply unit and the auxiliary power supply unit are connected to the control module; The control module sends a control instruction to the main power supply unit and / or the auxiliary power supply unit to switch the access state of the main power supply unit and / or the auxiliary power supply unit. When the AC power supply module further comprises a photovoltaic power supply unit, the main power supply unit and the auxiliary power supply unit both comprise a daily-use inverter and a transformer, the output end of the daily-use inverter is connected to the input end of the transformer; the output end of the transformer is connected to the AC bus; the input end of the daily-use inverter is connected to the power supply bus of the switch module; the output end of the photovoltaic power supply unit is connected to the AC bus.

6. The distributed DC power device of claim 5, wherein, ​ 7. The distributed DC power device of claim 6, wherein, The photovoltaic power supply unit comprises a photovoltaic power generation panel and a photovoltaic inverter; an output end of the photovoltaic power generation panel is connected with an input end of the photovoltaic inverter, and an output end of the photovoltaic inverter is connected with the AC bus.

8. The distributed DC power device of claim 7, wherein, The AC power supply module further comprises a plurality of circuit breakers; an output end of the photovoltaic power supply unit, one end of the series connection of the daily-use inverter and the transformer are connected with the AC bus through a circuit breaker.

9. The distributed DC power device of claim 5, wherein, The AC power supply module further comprises an AC shore power box, which is connected with the AC bus.

10. An electrical power device, characterized by The distributed DC power device comprises the distributed DC power device according to any one of claims 1 to 9.

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