Power supply system

Abstract

The present application discloses a power supply system, which belongs to the field of power supply technology. The power supply system includes: at least two power supply modules, the power supply module includes a confluence device and a first power supply device, the confluence device is connected to the first power supply device; at least two of the first power supply devices are divided into a host and a slave, the host is used to obtain the current of each of the confluence devices, and based on the current of the confluence device, control the circuit state of the corresponding confluence device. Through the one-to-one connection between the confluence device and the first power supply device of the power supply module, a modular design is formed, and the power supply module can be added according to the power supply demand to gradually expand the system. When a power supply module fails, a single module can be maintained in a targeted manner without the need to modify or maintain the entire system, which can reduce the downtime of the power supply system and reduce maintenance costs.

Description

Technical Field

[0001] The present application belongs to the field of power supply technology, and in particular, relates to a power supply system. Background Art

[0002] In a power supply system, multiple integrated power supply units are usually connected together to work together to provide greater power supply capacity and power output. Currently, multiple integrated power supply units are usually connected to a convergence device. When expanding the system or maintaining the system, it is usually necessary to modify or maintain the power supply system at the system level, which results in long downtime and high maintenance costs. Summary of the invention

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a power supply system, which can perform targeted maintenance on a single module when a power supply module fails, without the need to modify or maintain the entire system, thereby reducing the downtime of the power supply system and reducing maintenance costs.

[0004] In a first aspect, the present application provides a power supply system, the power supply system comprising:

[0005] At least two power supply modules, each of which comprises a merging device and a first power supply device, wherein the merging device is connected to the first power supply device;

[0006] At least two of the first power supply devices are divided into a master and a slave, and the master is used to obtain the current of each of the convergence devices and control the circuit state of the corresponding convergence device based on the current of the convergence device.

[0007] According to the power supply system of the present application, a modular design is formed by a one-to-one connection between the convergence device of the power supply module and the first power supply device. The system can be gradually expanded by adding power supply modules according to power supply needs. When a power supply module fails, a single module can be maintained in a targeted manner without the need to modify or maintain the entire system. This can reduce the downtime of the power supply system and reduce maintenance costs.

[0008] According to one embodiment of the present application, the at least two power supply modules include a first power supply module and a second power supply module, and the host is used to send a power output instruction to the first power supply module, and send a first power input instruction to the second power supply module, so that the first power supply module transmits power to the second power supply module.

[0009] According to one embodiment of the present application, the host is used to send an output power adjustment instruction to the first power supply module and an input power adjustment instruction to the second power supply module based on the current of the convergence device in the second power supply module. The first power supply module is used to adjust its own output power when receiving the output power adjustment instruction, and the second power supply module is used to adjust its own input power when receiving the input power adjustment instruction.

[0010] According to one embodiment of the present application, the power supply system is connected to a power grid and / or a second power supply device, and the host is used to send a second power input instruction to the second power supply module so that the first power supply module, the power grid and / or the second power supply device transmit power to the second power supply module.

[0011] According to one embodiment of the present application, the power supply system is connected to a power grid, a switching device is provided in the convergence device, the first power supply device is connected to the power grid through the switching device, and the host is used to send switch control instructions to the switching devices in each of the convergence devices based on the power supply status of the power grid to control the on and off of the switching devices.

[0012] According to one embodiment of the present application, the host is used to send a disconnection instruction to each of the switching devices when the power grid is in an abnormal power supply state, and control each of the switching devices to disconnect, so that the power supply system can operate off-grid.

[0013] According to one embodiment of the present application, the host is used to send a closing instruction to each of the switching devices when the power grid is in a normal power supply state, and control each of the switching devices to close, so that the power supply system can be connected to the grid and operate.

[0014] According to an embodiment of the present application, a switch device is provided in the current converging device, and the current converging device is used to disconnect the switch device when the input current of the current converging device itself is greater than a preset current threshold.

[0015] According to one embodiment of the present application, the power supply system connects a power grid and a second power supply device, and a first switching device and a second switching device are provided in the convergence device. The first power supply device is connected to the power grid through the first switching device, and is connected to the second power supply device through the second switching device. The host is used to send a first switch control instruction to the first switch device in each of the convergence devices to control the on and off of the first switch device, and send a second switch control instruction to the second switch device in each of the convergence devices to control the on and off of the second switch device.

[0016] According to one embodiment of the present application, when each of the second switching devices is closed, each of the first switching devices is disconnected, and the power grid is in a normal power supply state, the host is used to send a second disconnection instruction to each of the second switching devices to control the second switching devices to disconnect, and send a first closing instruction to each of the first switching devices to control the first switching devices to close.

[0017] According to one embodiment of the present application, when each of the first switch devices is closed, each of the second switch devices is opened, and the second power supply device is in a normal power supply state, the host is used to send a first opening instruction to each of the first switch devices to control the first switch devices to open, and send a second closing instruction to each of the second switch devices to control the second switch devices to close.

[0018] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 It is one of the structural schematic diagrams of the power supply system provided in the embodiment of the present application;

[0021] Figure 2 This is the second structural diagram of the power supply system provided in the embodiment of the present application;

[0022] Figure 3 This is the third structural diagram of the power supply system provided in the embodiment of the present application;

[0023] Figure 4 This is the fourth structural diagram of the power supply system provided in the embodiment of the present application;

[0024] Figure 5 This is the fifth structural diagram of the power supply system provided in the embodiment of the present application.

[0025] Reference numerals:

[0026] Power supply module 110, converging device 111, first power supply device 112, load 120, power grid 130,

[0027] Switch device 140 , first switch device 141 , second switch device 142 , second power supply device 150 . DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0029] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0030] The power supply system provided in the embodiment of the present application is described in detail below through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0031] like Figure 1 As shown, the power supply system includes at least two power supply modules 110 .

[0032] The power supply module 110 includes a current converging device 111 and a first power supply device 112 , and the current converging device 111 is connected to the first power supply device 112 .

[0033] The first power supply device 112 may be a diesel generator or a new energy power generation device such as a wind power generation device or a photovoltaic power generation device. The first power supply device 112 may also be a power conversion system (PCS) integrated machine.

[0034] The converging device 111 is a device for converging and distributing electric energy. The converging device 111 is connected to the first power supply device 112 . The converging device 111 can converging electric energy of the connected first power supply device 112 and can distribute the converging electric energy to the load 120 .

[0035] In this embodiment, the convergence device 111 may include an integrated port and a load port, the first power supply device 112 can be connected to the integrated port of the convergence device 111, the load ports of multiple convergence devices 111 can be connected in parallel to the load 120, one convergence device 111 can be connected to one first power supply device 112, the convergence device 111 and the connected first power supply device 112 can form a modular design, corresponding to the power supply module 110, the power supply system can include multiple power supply modules 110, and the multiple power supply modules 110 are connected in parallel.

[0036] In this embodiment, at least two first power supply devices 112 are divided into a master and a slave. The master is used to obtain the current of each convergence device 111 and control the circuit state of the corresponding convergence device 111 based on the current of the convergence device 111.

[0037] It should be noted that the host can obtain the current sampling value, voltage sampling value, power value and device status of each convergence device 111 and each first power supply device 112, and adjust the circuit status of the convergence device 111 and the first power supply device 112 based on the obtained parameter control.

[0038] In this embodiment, one first power supply device 112 can be determined as a host among at least two first power supply devices 112, and other first power supply devices 112 can be determined as slaves. The current of the port or internal branch of each convergence device 111 can be collected by a current collection device such as a current transformer (CT), and the current of each convergence device 111 can be centrally transmitted to the host. The host can control the circuit state of the corresponding convergence device 111 according to the current size and current flow direction of the convergence device 111. The circuit state may include disconnecting the circuit connection, connecting the circuit connection, and adjusting the circuit current.

[0039] In this embodiment, the host may generate a control instruction according to the received current, and send the control instruction to the corresponding converging device 111. It can be understood that the host may send the control instruction to the slave device and itself.

[0040] In the related art, when performing system expansion or system maintenance, it is usually necessary to transform or maintain the power supply system at the system level, which results in long downtime of the power supply system and high maintenance costs.

[0041] According to the power supply system provided in the embodiment of the present application, a modular design is formed by connecting the convergence device 111 of the power supply module 110 and the first power supply device 112 one-to-one. The power supply module 110 can be added according to the power supply demand to gradually expand the system. When the power supply module 110 fails, the single module can be maintained in a targeted manner without the need to modify or maintain the entire system. The downtime of the power supply system can be reduced and the maintenance cost can be reduced.

[0042] In some embodiments, at least two power supply modules 110 include a first power supply module and a second power supply module, and the host is used to send a power output instruction to the first power supply module and send a first power input instruction to the second power supply module, so that the first power supply module transmits power to the second power supply module.

[0043] Among them, the first power supply module is a module for outputting electric energy, the second power supply module is a module for receiving electric energy input, the first power supply module is connected to the second power supply module, and the first power supply module can transmit electric energy to the second power supply module.

[0044] The power output instruction is an instruction for controlling the first power supply module to output power, and the first power input instruction is an instruction for controlling the second power supply module to receive power input.

[0045] It can be understood that any power supply module 110 can be used as a first power supply module or a second power supply module. The power supply module 110 that receives an electric energy output instruction serves as a first power supply module to output electric energy, and the power supply module 110 that receives a first electric energy input instruction serves as a second power supply module to receive electric energy input.

[0046] In some embodiments, the host is used to send an output power adjustment instruction to the first power supply module and an input power adjustment instruction to the second power supply module based on the current of the convergence device 111 in the second power supply module. The first power supply module is used to adjust its own output power when receiving the output power adjustment instruction, and the second power supply module is used to adjust its own input power when receiving the input power adjustment instruction.

[0047] The output power adjustment instruction is an instruction for controlling the first power supply module to adjust its own output power, and the input power adjustment instruction is an instruction for controlling the second power supply module to adjust its own input power.

[0048] In this embodiment, the output power adjustment instruction may include an output power increase instruction and an output power decrease instruction, and the input power adjustment instruction may include an input power increase instruction and an input power decrease instruction.

[0049] The host can compare the current of the convergence device 111 in the second power supply module with a preset current range, and send an output power adjustment instruction to the first power supply module and an input power adjustment instruction to the second power supply module when the current of the convergence device 111 in the second power supply module is not within the preset current range.

[0050] For example, when the current of the convergence device 111 in the second power supply module is greater than a preset current range, the host can send an output power reduction instruction to the first power supply module and an input power reduction instruction to the second power supply module to reduce the output power of the first power supply module and the input power of the second power supply module, thereby reducing the current of the convergence device 111 in the second power supply module to avoid overcurrent.

[0051] When the current of the convergence device 111 in the second power supply module is less than a preset current range, the host can send an output power increase instruction to the first power supply module and an input power increase instruction to the second power supply module to increase the output power of the first power supply module and the input power of the second power supply module, thereby increasing the current of the convergence device 111 in the second power supply module to meet the power supply requirements of the load 120.

[0052] In some embodiments, the power supply system is connected to the power grid 130 and / or the second power supply device 150, and the host is used to send a second power input instruction to the second power supply module so that the first power supply module, the power grid 130 and / or the second power supply device 150 transmit power to the second power supply module.

[0053] The second power supply device 150 may be a diesel generator, a battery, or the like.

[0054] In this embodiment, the power supply system can be connected to the power grid 130, or to the second power supply device 150, or to both the power grid 130 and the second power supply device 150. The power supply system can be connected to one second power supply device 150, or to multiple second power supply devices 150.

[0055] The second power input instruction is an instruction sent by the host to the second power supply module when the power supply system is connected to the power grid 130 and / or the second power supply device 150, so as to control the second power supply module to receive power from the first power supply module, the power grid 130 and the second power supply device 150.

[0056] For example, Figure 2As shown, take the power supply system including two power supply modules 110 as an example, wherein module a is the second power supply module, module b is the first power supply module, the first power supply device 112 of module a is the host, the power supply system is connected to the power grid 130, the first power supply device 112 in module a absorbs power from port 1 of the convergence device 111, and the first power supply device 112 in module b outputs power to port 1 of the convergence device 111. The first power supply device 112 of module a absorbs power from two sources, one part from the power grid 130, and the other part from the first power supply device 112 of module b. During the power transmission process, the branch current of the convergence device 111 of module a may exceed the preset current range, resulting in overcurrent.

[0057] The current transformer installed at the branch of the convergence device 111 of module a collects current in real time and transmits the branch current to the host. When the current absorbed by the first power supply device 112 in module a from port 1 of the convergence device 111 is close to or exceeds the current safety threshold, the host sends an input power reduction instruction to module a and an output power reduction instruction to module b, dynamically adjusts the power absorption of the first power supply device 112 of module a and the power output of the first power supply device 112 of module b, thereby dynamically adjusting the branch current of the convergence device 111 of module a to ensure that the branch current does not exceed the current safety threshold and avoid branch overcurrent.

[0058] In some embodiments, the power supply system is connected to the power grid 130, a switch device 140 is provided in the convergence device 111, and the first power supply device 112 is connected to the power grid 130 through the switch device 140. The host is used to send switch control instructions to the switch devices 140 in each convergence device 111 based on the power supply status of the power grid 130 to control the on and off of the switch devices 140.

[0059] Among them, the switching device 140 can be a relay, etc., the switch control instruction is an instruction to control the on and off of the switching device 140, and the switch control instruction can include a closing instruction and an opening instruction. The switching device 140 closes when receiving a closing instruction and opens when receiving an opening instruction.

[0060] It can be understood that when the switch device 140 between the first power supply device 112 and the power grid 130 is closed, the first power supply device 112 is connected to the power grid 130, and when the switch device 140 between the first power supply device 112 and the power grid 130 is opened, the first power supply device 112 is disconnected from the power grid 130.

[0061] In this embodiment, the power supply status of the power grid 130 may include a normal power supply status and an abnormal power supply status. The host sends different switch control instructions to the switch devices 140 in each convergence device 111 according to the normal power supply status and the abnormal power supply status.

[0062] In some embodiments, the host is used to send a disconnection instruction to each switch device 140 when the power grid 130 is in an abnormal power supply state, and control each switch device 140 to disconnect, so as to enable the power supply system to operate off-grid.

[0063] like Figure 1 As shown, the port1 ports of each power supply module 110 are connected in parallel to the Port1` port, and the Port1` port is connected to the power grid 130. When a fault occurs in the power grid 130, the host sends a disconnection instruction to the switch devices 140 in each convergence device 111, and each switch device 140 is quickly disconnected, and all the first power supply devices 112 in the power supply system are switched to off-grid operation.

[0064] like Figure 3 As shown, each first power supply device 112 in the power supply system operates off-grid, and the host can control the output voltage of the load port of each first power supply device 112 to be the rated voltage, the rated voltage can be 230V, and the output power can be the rated power, the rated power can be 50Hz, to ensure continuous power supply to the load 120.

[0065] In some embodiments, the host is used to send closing instructions to each switch device 140 when the power grid 130 is in a normal power supply state, and control each switch device 140 to close, so that the power supply system can be connected to the grid.

[0066] In this embodiment, when the power grid 130 is in a normal power supply state, each switch device 140 is in a closed state, and each first power supply device 112 is connected to the grid for operation.

[0067] After the power grid 130 switches from the abnormal power supply state to the normal power supply state, the host sends a closing instruction to each switch device 140, each switch device 140 is closed again, and the power supply system is connected to the grid and operated.

[0068] It is understandable that the power supply system may also be connected to other power generation equipment, and a switch device 140 may also be provided between each first power supply device 112 and the power generation equipment, and the state of each switch device 140 may be controlled according to the power supply state of the connected power generation equipment.

[0069] In some embodiments, a switch device 140 is provided in the converging device 111 , and the converging device 111 is used to disconnect the switch device 140 when the input current of the converging device 111 is greater than a preset current threshold.

[0070] The preset current threshold is a preset current value, which can represent the upper limit of the input current that the converging device 111 can withstand.

[0071] like Figure 1As shown, the switch device 140 provided in the convergence device 111 may not be able to carry excessive current due to hardware limitations. A corresponding preset current threshold is set for the port 1 of each convergence device 111. Taking module a as an example, when the first power supply device 112 in module a detects that the input current at port 1 of the convergence device 111 exceeds the corresponding preset current threshold, it immediately sends a disconnection instruction to the switch device 140 of the convergence device 111 to control the corresponding switch device 140 to disconnect. The first power supply device 112 can also provide real-time alarm information, which can effectively prevent current overload from causing damage to the convergence device 111 and the first power supply device 112.

[0072] In some embodiments, the power supply system connects the power grid 130 and the second power supply device 150, and the first switch device 141 and the second switch device 142 are provided in the convergence device 111. The first power supply device 112 is connected to the power grid 130 through the first switch device 141, and is connected to the second power supply device 150 through the second switch device 142. The host is used to send a first switch control instruction to the first switch device 141 in each convergence device 111 to control the on and off of the first switch device 141, and send a second switch control instruction to the second switch device 142 in each convergence device 111 to control the on and off of the second switch device 142.

[0073] In this embodiment, the first power supply device 112 is connected to the power grid 130 through the first switching device 141. When the first switching device 141 is closed, the first power supply device 112 is connected to the power grid 130. When the first switching device 141 is disconnected, the connection between the first power supply device 112 and the power grid 130 is disconnected. The first power supply device 112 is connected to the second power supply device 150 through the second switching device 142. When the second switching device 142 is closed, the first power supply device 112 is connected to the second power supply device 150. When the second switching device 142 is disconnected, the connection between the first power supply device 112 and the second power supply device 150 is disconnected.

[0074] The first switch control instruction is an instruction for controlling the on-off state of the first switch device 141 , and the second switch control instruction is an instruction for controlling the on-off state of the second switch device 142 .

[0075] It can be understood that the first switch control instruction may include a first closing instruction and a first opening instruction, the first closing instruction is used to control the first switch device 141 to close, and the first opening instruction is used to control the first switch device 141 to open, and the second switch control instruction may include a second closing instruction and a second opening instruction, the second closing instruction is used to control the second switch device 142 to close, and the second opening instruction is used to control the second switch device 142 to open.

[0076] In this embodiment, the first switch device 141 and the second switch device 142 can be closed at the same time, and the power grid 130, the second power supply device 150 and the first power supply device 112 supply power to the load 120 at the same time. The first switch device 141 and the second switch device 142 can also be closed based on priority. When the power grid 130 and the second power supply device 150 are in a normal power supply state at the same time, the first switch device 141 can be disconnected, the second switch device 142 can be closed, the second power supply device 150 and the first power supply device 112 supply power to the load 120, and the power supply system can operate off-grid. The second switch device 142 can also be disconnected, the first switch device 141 can be closed, the power supply system can operate in conjunction with the grid, the first power supply device 112 and the power grid 130 supply power to the load 120, and the second power supply device 150 can be shut down.

[0077] In some embodiments, when each second switch device 142 is closed, each first switch device 141 is disconnected, and the power grid 130 is in a normal power supply state, the host is used to send a second disconnection instruction to each second switch device 142 to control the second switch device 142 to disconnect, and send a first closing instruction to each first switch device 141 to control the first switch device 141 to close.

[0078] like Figure 4 As shown, port1 ports of multiple power supply modules 110 are connected to port1′ port, which is connected to the power grid 130 , and port2 ports of multiple power supply modules 110 are connected to port2′ port, which is connected to the second power supply device 150 .

[0079] The power supply priority of the power grid 130 is set to be higher than the power supply priority of the second power supply device 150. When the power grid 130 is in a normal power supply state, each first switch device 141 is closed, and each first power supply device 112 is connected to the grid and operates. When a fault occurs in the power grid 130, the host sends a first disconnection instruction to the first switch devices 141 in each convergence device 111, and all the first switch devices 141 in the convergence device 111 are quickly disconnected, and all the first power supply devices 112 in the system are switched to an off-grid state. Each first power supply device 112 is in an off-grid state and controls its own output port to a rated voltage, such as 230V, and maintains a rated frequency, such as 50Hz, to ensure continuous power supply to the load 120.

[0080] like Figure 5As shown, it is detected that the second power supply device 150 is in a normal state, the host sends a second closing instruction to control each second switch device 142 to close, and the power supply system is in a state of being connected to the second power supply device 150, and the priority of the power grid 130 is set higher than that of the second power supply device 150. When it is detected that the power grid 130 has returned to a normal state, the host sends a second disconnection instruction to each second switch device 142 to control the second switch device 142 to disconnect, and sends a first closing instruction to each first switch device 141 to control the first switch device 141 to close, and the power supply system is connected to the grid again.

[0081] In some embodiments, when each first switch device 141 is closed, each second switch device 142 is opened, and the second power supply device 150 is in a normal power supply state, the host is used to send a first opening instruction to each first switch device 141 to control the first switch device 141 to open, and send a second closing instruction to each second switch device 142 to control the second switch device 142 to close.

[0082] In this embodiment, the priority of the second power supply device 150 is higher than that of the power grid 130. When it is detected that the second power supply device 150 is in an abnormal power supply state and the power grid 130 is in a normal power supply state, the host sends a first closing instruction to control each first switch device 141 to close, and the power supply system is in a grid-connected state. When it is detected that the second power supply device 150 has returned to a normal state, the host sends a first disconnecting instruction to each first switch device 141 to control the first switch device 141 to disconnect, and sends a second closing instruction to each second switch device 142 to control the second switch device 142 to close, and the power supply system is in a state connected to the second power supply device 150.

[0083] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0084] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a computer software product, which is stored in a storage medium and includes a number of instructions for enabling a terminal to execute the methods described in each embodiment of the present application.

[0085] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

[0086] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0087] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A power supply system, characterized in that: include: At least two power supply modules, each of which comprises a merging device and a first power supply device, wherein the merging device is connected to the first power supply device; A converging device is connected to a first power supply device, and the converging device and the connected first power supply device form a modular design, corresponding to a power supply module; The load port of each current converging device is connected in parallel to the load; At least two of the first power supply devices are divided into a master and a slave, the master is used to obtain the current of each of the convergence devices, and control the circuit state of the corresponding convergence device based on the current of the convergence device; The at least two power supply modules include a first power supply module and a second power supply module, and the host is used to send an electric energy output instruction to the first power supply module, and send a first electric energy input instruction to the second power supply module, so that the first power supply module transmits electric energy to the second power supply module; The power supply system is connected to the power grid, the first switch device is provided in the converging device, the first power supply device is connected to the power grid through the first switch device, and the host is used to send a switch control instruction to the first switch device in each of the converging devices based on the power supply state of the power grid to control the on and off of the first switch device; The host is used to send an output power adjustment instruction to the first power supply module and an input power adjustment instruction to the second power supply module based on the current of the convergence device in the second power supply module. The first power supply module is used to adjust its own output power when receiving the output power adjustment instruction, and the second power supply module is used to adjust its own input power when receiving the input power adjustment instruction.

2. The power supply system according to claim 1, characterized in that: The power supply system is connected to the power grid and / or a second power supply device, and the host is used to send a second power input instruction to the second power supply module so that the first power supply module and / or the power grid transmits power to the second power supply module.

3. The power supply system according to claim 1, characterized in that: The host is used to send a disconnection instruction to each of the first switching devices when the power grid is in an abnormal power supply state, and control each of the first switching devices to disconnect, so as to enable the power supply system to operate off-grid.

4. The power supply system according to claim 1, characterized in that: The host is used to send a closing instruction to each of the first switching devices when the power grid is in a normal power supply state, and control each of the first switching devices to close, so that the power supply system can be connected to the grid and operate.

5. The power supply system according to any one of claims 1 to 4, characterized in that: The current converging device is used to disconnect the first switching device when its input current is greater than a preset current threshold.

6. The power supply system according to any one of claims 1 to 4, characterized in that: The power supply system is connected to a second power supply device, a second switch device is provided in the convergence device, the first power supply device is connected to the second power supply device via the second switch device, and the host is used to send a first switch control instruction to the first switch device in each of the convergence devices to control the on and off of the first switch device, and send a second switch control instruction to the second switch device in each of the convergence devices to control the on and off of the second switch device.

7. The power supply system according to claim 6, characterized in that: When each of the second switching devices is closed, each of the first switching devices is opened, and the power grid is in a normal power supply state, the host is used to send a second opening instruction to each of the second switching devices to control the second switching devices to open, and send a first closing instruction to each of the first switching devices to control the first switching devices to close.

8. The power supply system according to claim 6, characterized in that: When each of the first switch devices is closed, each of the second switch devices is opened, and the second power supply device is in a normal power supply state, the host is used to send a first opening instruction to each of the first switch devices to control the first switch devices to open, and send a second closing instruction to each of the second switch devices to control the second switch devices to close.

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