An intelligent standby power supply topology, control method and standby power supply system

Abstract

This invention relates to an intelligent backup power topology, control method, and backup power system, including a grid-connected input interface, an intelligent interface, a first grid-connected output interface, a second grid-connected output interface, a first off-grid output interface, a second off-grid output interface, a first load interface, a second load interface, a first relay, a second relay, a third relay, a fourth relay, a fifth relay, a sixth relay, and a control unit. The control unit controls the opening and closing of each relay by collecting voltage, current, and external device type data at each interface. This invention is compatible with both single-phase and three-phase systems, enabling seamless switching of load power supply, access to multiple types of inverters, parallel operation of multiple energy storage inverters, single-unit power supply of multiple energy storage inverters, and intelligent load management. It can automatically switch energy providers, offers diverse energy exchange methods, and achieves high energy utilization.

Description

Technical Field

[0001] This invention relates to the field of backup power technology, specifically to an intelligent backup power topology, control method, and backup power system. Background Technology

[0002] A backup power system is a system that provides temporary power to critical loads when the power grid fails. It typically integrates photovoltaics, batteries, energy storage inverters, etc., to achieve self-generation and emergency power supply.

[0003] Existing backup power systems mainly include backup power boxes, the power grid, photovoltaic panels, energy storage inverters, grid-connected inverters, batteries, and loads (household backup power loads, non-critical loads), etc. For example... Figure 1 As shown: The backup power box serves as the core hub. At the input end, the system has multiple power supply capabilities: it can draw power from the grid or receive power from the grid-connected inverter. At the energy storage and photovoltaic end, the DC power generated by the photovoltaic panels is converted into AC power by the energy storage inverter and then connected to the backup power box. At the same time, the energy storage inverter is also responsible for managing the charging and discharging of the battery, providing backup support for the system. Finally, the backup power box distributes the collected power to the end loads, such as household backup power loads and non-critical loads.

[0004] However, this architecture has a core drawback: it has strict limitations on the output form of energy storage inverters. It can only connect to either dual-output energy storage inverters or single-output energy storage inverters, resulting in a single form and low energy utilization. Summary of the Invention

[0005] One object of the present invention is to provide an intelligent backup power topology, particularly a system-level backup power topology.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A smart backup power topology includes: Grid-connected input interface: used to connect to the power grid, the grid-connected interface is connected to the AC bus via a first relay; Intelligent interface: The intelligent interface is connected to the AC bus via a second relay; The first grid-connected output interface, the second grid-connected output interface, the first off-grid output interface, and the second off-grid output interface are used to connect to the energy storage inverter. The first grid-connected output interface and the second grid-connected output interface are connected to the AC bus via a third relay. The first off-grid output interface is connected to the AC bus via a fourth relay. The second off-grid output interface is connected to the AC bus via a fifth relay. First load interface and second load interface: used to connect loads. The first load interface is directly connected to the AC bus, and the second load interface is connected to the AC bus through the sixth relay. Control unit: Used to collect voltage at each interface, collect current at the grid-connected input interface, smart interface, first load interface, and second load interface, obtain the type of external device, and control the opening and closing of each relay based on feedback of voltage, current, and device type.

[0007] In a preferred embodiment of the above technical solution, the fifth and sixth relays are simultaneously connected to the AC bus via the seventh relay.

[0008] Preferably, in the above technical solution, the grid-connected input interface, intelligent interface, first grid-connected output interface, second grid-connected output interface, first off-grid output interface, second off-grid output interface, first load interface, second load interface, first relay, second relay, third relay, fourth relay, fifth relay, and sixth relay are all three-phase structures; The L1 and L2 interfaces of the first off-grid output interface are connected by a first switch, and the L2 and L3 interfaces of the first off-grid output interface are connected by a second switch.

[0009] Preferably, in the above technical solution, the control unit includes: Voltage acquisition module: used to acquire the voltage at each interface; Current acquisition module: used to acquire the current at the grid-connected input interface, intelligent interface, first load interface, and second load interface; External communication module: used to obtain the type of external device; Drive control module: Connected to the voltage acquisition module, current acquisition module, and external communication module, it is used to control the opening and closing of each relay based on feedback of voltage, current, and external device type.

[0010] Preferably, in the above technical solution, the backup power topology further includes an auxiliary power module, which is connected to the control unit and is used to supply power to the control unit when it is off-grid.

[0011] Another objective of this invention is to provide an intelligent backup power control method.

[0012] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A smart backup power control method, implemented through a single-phase structure of the smart backup power topology, includes grid-connected mode and off-grid mode. When in grid-connected mode: close the first relay, second relay, third relay, sixth relay, and seventh relay, and open the fourth relay and fifth relay. The power grid supplies power to the load connected to the first load interface and / or the second load interface through the grid-connected input interface. When in off-grid mode: disconnect the first relay, the second relay, and the third relay, and close the fourth relay, the fifth relay, and the sixth relay. The energy storage inverter supplies power to the loads connected to the first load interface and / or the second load interface through the first off-grid output interface and the second off-grid output interface, respectively, or supplies power to the loads connected to the first load interface and / or the second load interface simultaneously.

[0013] Preferably, the above technical solution includes an independent offline mode and a parallel offline mode. When in standby mode: the seventh relay is disconnected, one energy storage inverter supplies power to the load connected to the first load interface through the first off-grid output interface, and the other energy storage inverter supplies power to the load connected to the second load interface through the second off-grid output interface; When in parallel off-grid mode: when the seventh relay is closed, the energy storage inverter supplies power to the loads connected to the first load interface and / or the second load interface simultaneously through the first off-grid output interface and the second off-grid output interface.

[0014] More preferably, when the smart interface is connected to a load and is in an independent off-grid mode, the second relay is closed, and the energy storage inverter supplies power to the load connected to the first load interface and the smart interface simultaneously through the first off-grid output interface; When the smart interface is connected to a load and is in parallel off-grid mode, the second relay is closed, and the energy storage inverter supplies power to the load connected to the first load interface and / or the second load interface and the smart interface simultaneously through the first off-grid output interface and the second off-grid output interface.

[0015] Preferably, in the above technical solution, when the smart interface is connected to the energy storage inverter and the second relay is closed, the energy storage inverter supplies power to the load connected to the first load interface and / or the second load interface through the smart interface.

[0016] Another objective of this invention is to provide an intelligent backup power control method.

[0017] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A smart backup power control method, implemented through the three-phase structure of the smart backup power topology, includes: When any phase in the three-phase structure is abnormal, disconnect the first and third relays of the abnormal phase, and close the first or second switch. When any two phases in the three-phase structure are abnormal, the first and third relays of the abnormal phases are disconnected, and the first and second switches are closed.

[0018] Another object of the present invention is to provide an intelligent backup power system.

[0019] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A smart backup power system includes a backup power box, an energy storage inverter, a battery and / or a photovoltaic panel, wherein the battery and / or photovoltaic panel are connected to the energy storage inverter, and the backup power box contains the smart backup power topology.

[0020] Preferably, in the above technical solution, the energy storage inverter is a single-output energy storage inverter or a dual-output energy storage inverter. The single-output energy storage inverter is connected to the first grid-connected output interface, the second grid-connected output interface, and the smart interface. The dual-output inverter is connected to the first grid-connected output interface, the second grid-connected output interface, the first off-grid output interface, the second off-grid output interface, and the smart interface.

[0021] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: The topology of this invention is compatible with both single-phase and three-phase power supply, enabling seamless switching of load power supply, access to multiple types of inverters, parallel operation of multiple energy storage inverters (including off-grid and grid-connected parallel operation), single-unit power supply of multiple energy storage inverters, and intelligent load management. This invention can automatically switch energy providers, offers diverse energy exchange methods, and achieves high energy utilization. Attached Figure Description

[0022] Figure 1 This is a schematic block diagram of the structure of a backup power system in the prior art; Figure 2 This is a schematic diagram of the topology of Example 1; Figure 3 This is a control schematic block diagram of Embodiment 1; Figure 4 This is a schematic diagram of the topology of Example 2; Figure 5 This is a block diagram illustrating the structure of Embodiment 3.

[0023] In the attached diagrams above: 1. Grid-connected input interface; 2. Intelligent interface; 30. First grid-connected output interface; 31. Second grid-connected output interface; 40. First off-grid output interface; 41. Second off-grid output interface; 50. First load interface; 51. Second load interface; 60. First relay; 61. Second relay; 62. Third relay; 63. Fourth relay; 64. Fifth relay; 65. Sixth relay; 66. Seventh relay. Detailed Implementation

[0024] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] Example 1: As Figure 2 As shown: A smart backup power topology includes a grid-connected input interface 1, a smart interface 2, a first grid-connected output interface 30, a second grid-connected output interface 31, a first off-grid output interface 40, a second off-grid output interface 41, a first load interface 50, a second load interface 51, and an AC bus.

[0027] The grid-connected input interface 1 is used to connect to the power grid, and the grid-connected input interface 1 is connected to the AC bus via the first relay 60.

[0028] Smart Interface 2 is a variable interface used to connect input sources such as grid-connected inverters, energy storage inverters, generators, and heat pumps, or to connect loads. When connected to an energy storage inverter, it can be used as a grid-connected output interface to connect a single-output energy storage inverter, or as an off-grid output interface to connect a dual-output energy storage inverter. Smart Interface 2 is connected to the AC bus via the second relay 61.

[0029] The first grid-connected output interface 30, the second grid-connected output interface 31, the first off-grid output interface 40, and the second off-grid output interface 41 are used to connect to the energy storage inverter. For a single-output energy storage inverter, only the first grid-connected output interface 30 and the second grid-connected output interface 31 are connected. For a dual-output energy storage inverter, both the first grid-connected output interface 30 and the first off-grid output interface 40, the second grid-connected output interface 31 and the second off-grid output interface 41 are connected. The first grid-connected output interface 30 and the second grid-connected output interface 31 are connected to the AC bus via a third relay 62, meaning that the first grid-connected output interface 30 and the second grid-connected output interface 31 are simultaneously controlled by a third relay 62 to switch on and off with the AC bus. The first off-grid output interface 40 is connected to the AC bus via a fourth relay 63, and the second off-grid output interface 41 is connected to the AC bus via a fifth relay 64.

[0030] The first load interface 50 and the second load interface 51 are used to connect loads. The first load interface 50 is connected to critical loads, and the second load interface 51 is connected to non-critical loads. The first load interface 50 is directly connected to the AC bus, and the second load interface 51 is connected to the AC bus through the sixth relay 65.

[0031] In one embodiment of this example: the fifth relay 64 and the sixth relay 65 are simultaneously connected to the AC bus via the seventh relay 66. That is, the seventh relay 66 can simultaneously control the connection and disconnection between the second off-grid output interface 41, the second load interface 51 and the AC bus. However, the connection and disconnection between the second off-grid output interface 41 and the second load interface 51 are controlled by the fifth relay 64 and the sixth relay 65 to achieve the switching between the standby power topology independent off-grid mode and the parallel off-grid mode.

[0032] In this embodiment, all interfaces and relays are single-phase structures.

[0033] like Figure 3 As shown: The intelligent topology also includes a control unit and an auxiliary power module, wherein: The control unit is used to collect voltage data at each interface, current data at the grid-connected input interface, smart interface, first load interface, and second load interface, and to obtain the type of external devices. External devices refer to devices connected to each interface, such as energy storage inverters, grid-connected inverters, generators, or heat pumps, or load devices. The control unit controls the opening and closing of each relay based on feedback from voltage, current, and device type, achieving system-level control. Specifically, the control unit includes a voltage acquisition module, a current acquisition module, an external communication module, and a drive control module. The voltage acquisition module collects voltage data at each interface; the current acquisition module collects current data at the grid-connected input interface, smart interface, first load interface, and second load interface; the external communication module obtains the type of external devices; and the drive control module is connected to the voltage acquisition module, current acquisition module, and external communication module, and is used to control the opening and closing of each relay based on feedback from voltage, current, and external device type.

[0034] The auxiliary power module is connected to the control unit and is used to power the control unit when it is off-grid. Specifically, it powers the voltage acquisition module, current acquisition module, external communication module, and drive control module to ensure that the control unit can still control the opening and closing of each relay when it is off-grid.

[0035] The control method of this embodiment is described in detail below, specifically including grid-connected mode and off-grid mode.

[0036] When only one load is connected, the load is preferentially connected to the first load interface 50.

[0037] When in grid-connected mode: close the first relay 60, the second relay 61, and the third relay 62, and open the fourth relay 63, the fifth relay 64, the sixth relay 65, and the seventh relay 66. The power grid supplies power to the load connected to the first load interface 50 through the grid-connected input interface 1.

[0038] When in off-grid mode: disconnect the first relay 60, the second relay 61, the third relay 62, and the seventh relay 66, and close the fourth relay 63. The energy storage inverter supplies power to the load connected to the first load interface 50 through the first off-grid output interface 40.

[0039] When the battery SOC (state of charge) is low and the first off-grid output interface 40 is unable to drive the load on the first load interface 50, the following methods can be used: Method 1: Disconnect the fourth relay 63, close the fifth relay 64 and the seventh relay 66, and supply power to the load connected to the first load interface 50 through the second off-grid output interface 41. Alternatively, the fourth relay 63, the fifth relay 64, and the seventh relay 66 can be closed simultaneously to supply power to the load connected to the first load interface 50 through the first off-grid output interface 40 and the second off-grid output interface 41.

[0040] Method 2: Connect the smart interface 2 to the energy storage inverter, disconnect the fourth relay 63, close the second relay 61, and supply power to the load connected to the first load interface 50 through the smart interface 2; Alternatively, the second relay 61 and the fourth relay 63 can be closed simultaneously to supply power to the load connected to the first load interface 50 through the first off-grid output interface 40 and the smart interface 2.

[0041] Alternatively, the second relay 61, the fourth relay 63, the fifth relay 64, and the seventh relay 66 can be closed simultaneously to supply power to the load connected to the first load interface 50 through the first off-grid output interface 40, the second off-grid output interface 41, and the smart interface 2.

[0042] When connecting two loads: When in grid-connected mode: close the first relay 60, the second relay 61, the third relay 62, the sixth relay 65, and the seventh relay 66, and open the fourth relay 63 and the fifth relay 64. The power grid supplies power to the loads connected to the first load interface 50 and the second load interface 51 through the grid-connected input interface 1.

[0043] When in off-grid mode: disconnect the first relay 60, the second relay 61, and the third relay 62, and close the fourth relay 63, the fifth relay 64, and the sixth relay 65. The energy storage inverter supplies power to the loads connected to the first load interface 50 and the second load interface 51 through the first off-grid output interface 40 and the second off-grid output interface 41, respectively, or supplies power to the loads connected to the first load interface 50 and the second load interface 51 simultaneously.

[0044] In this embodiment, the off-grid mode specifically includes independent off-grid mode and parallel off-grid mode, which can be switched by opening and closing the seventh relay 66.

[0045] When in standby mode: Disconnect the seventh relay 66, one energy storage inverter supplies power to the load connected to the first load interface 50 through the first off-grid output interface 40, and the other energy storage inverter supplies power to the load connected to the second load interface 51 through the second off-grid output interface 41.

[0046] When in parallel off-grid mode: when the seventh relay 66 is closed, the energy storage inverter supplies power to the loads connected to the first load interface 50 and the second load interface 51 simultaneously through the first off-grid output interface 40 and the second off-grid output interface 41.

[0047] When the battery SOC (state of charge) is low, prioritize power supply to critical loads (on the first load interface 50), which can be achieved using the following methods: Method 1: Disconnect the fourth relay 63 and the sixth relay 65, and close the fifth relay 64 and the seventh relay 66 to supply power to the load connected to the first load interface 50 through the second off-grid output interface 41. Alternatively, the sixth relay 65 can be disconnected, and the fifth relay 64 and the seventh relay 66 can be closed, simultaneously supplying power to the load connected to the first load interface 50 through the first off-grid output interface 40 and the second off-grid output interface 41. Alternatively, disconnect the fourth relay 63 and close the fifth relay 64, the sixth relay 65, and the seventh relay 66 to simultaneously supply power to the loads connected to the first load interface 50 and the second load interface 51 through the second off-grid output interface 41.

[0048] Method 2: Connect the smart interface 2 to the energy storage inverter, disconnect the fourth relay 63 and the fifth relay 64, and close the second relay 61, the sixth relay 65 and the seventh relay 66. Simultaneously supply power to the loads connected to the first load interface 50 and the second load interface 51 through the smart interface 2. Alternatively, disconnect the fifth relay 64 and close the second relay 61, the fourth relay 63, the sixth relay 65, and the seventh relay 66, and simultaneously supply power to the load connected to the first load interface 50 and the second load interface 51 through the first off-grid output interface 40 and the smart interface 2. Alternatively, disconnect the fourth relay 63 and close the second relay 61, the fifth relay 64, the sixth relay 65, and the seventh relay 66, and simultaneously supply power to the loads connected to the first load interface 50 and the second load interface 51 through the second off-grid output interface 41 and the smart interface 2. Alternatively, closing the second relay 61, the fourth relay 63, the fifth relay 64, and the seventh relay 66 simultaneously supplies power to the loads connected to the first load interface 50 and the second load interface 51 through the first off-grid output interface 40, the second off-grid output interface 41, and the smart interface 2.

[0049] In addition, when the smart interface 2 is connected to the load and is in independent off-grid mode, the second relay 61 is closed, and the energy storage inverter supplies power to the load connected to the first load interface 50 and the smart interface 2 simultaneously through the first off-grid output interface 40.

[0050] When the smart interface 2 is connected to a load and is in parallel off-grid mode, the second relay 61 is closed, and the energy storage inverter supplies power to the loads connected to the first load interface 50, the second load interface 51, and the smart interface 2 simultaneously through the first off-grid output interface 40 and the second off-grid output interface 41.

[0051] The above only lists the main control modes and does not represent all control modes of the backup power topology in this embodiment.

[0052] Example 2: Figure 4 As shown: This embodiment is basically the same as Embodiment 1, except that: in this embodiment, the grid-connected input interface 1, intelligent interface 2, first grid-connected output interface 30, second grid-connected output interface 31, first off-grid output interface 40, second off-grid output interface 41, first load interface 50, second load interface 51, first relay 60, second relay 61, third relay 62, fourth relay 63, fifth relay 64, sixth relay 65, and seventh relay 66 are all three-phase structures; the L1, L2, L3, and N of each interface and each relay are connected one by one according to the connection method of Embodiment 1.

[0053] In this embodiment: the L1 interface and L2 interface of the first off-grid output interface 40 are connected by a first switch K1, and the L2 interface and L3 interface of the first off-grid output interface 40 are connected by a second switch K2.

[0054] In practical applications, one of the three phases may experience abnormal voltage or frequency. In this case, the abnormal phase's relay can be disconnected by voltage or frequency detection, thus putting the abnormal phase into an off-grid state.

[0055] When any phase in the three-phase structure malfunctions, the first relay 60 and the third relay 62 of the malfunctioning phase are disconnected, and the first switch K1 or the second switch K2 is closed, as follows: L1 phase abnormality: Disconnect the first relay 60 and the third relay 62 of L1, close the first switch K1, and the L1 interface of the first off-grid output interface 40 is powered through the L2 interface of the grid-connected input interface 1. L2 phase abnormality: Disconnect the first relay 60 and the third relay 62 of L2, close the first switch K1, and the L2 interface of the first off-grid output interface 40 is powered through the L1 interface of the grid-connected input interface 1; or close the second switch K2, and the L2 interface of the first off-grid output interface 40 is powered through the L3 interface of the grid-connected input interface 1. L3 phase abnormality: Disconnect the first relay 60 and the third relay 62 of L3, close the second switch K2, and the L3 interface of the first off-grid output interface 40 is powered through the L4 interface of the grid-connected input interface 1.

[0056] When any two phases in the three-phase structure are abnormal, disconnect the first relay 60 and the third relay 62 of the abnormal phase, and close the first switch K1 and the second switch K2.

[0057] In this way, even in off-grid mode, power can still be supplied to the load normally through the first off-grid output interface 40.

[0058] Example 3: Figure 5 As shown: An intelligent backup power system includes a backup power box, an energy storage inverter, a battery and / or a photovoltaic panel, wherein the battery and / or photovoltaic panel are connected to the energy storage inverter. Wherein:

[0059] The backup power box includes a single-phase intelligent backup power topology of Embodiment 1 or a three-phase intelligent backup power topology of Embodiment 2, such that the backup power box has the above-mentioned grid-connected input interface 1, intelligent interface 2, first grid-connected output interface 30, second grid-connected output interface 31, first off-grid output interface 40, second off-grid output interface 41, first load interface 50, and second load interface 51.

[0060] The energy storage inverter can be a single-output energy storage inverter or a dual-output energy storage inverter. The single-output energy storage inverter is connected to any one of the first grid-connected output interface 30, the second grid-connected output interface 31, or the smart interface 2. The dual-output inverter is connected to the first grid-connected output interface 30 and the first off-grid output interface 40, the second grid-connected output interface 31 and the second off-grid output interface 41, or connected to the smart interface 2 and used as the off-grid output interface.

[0061] Batteries, photovoltaic panels, and energy storage inverters are connected to provide energy to the energy storage inverters.

[0062] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A smart backup power topology, characterized in that: include: Grid-connected input interface: used to connect to the power grid, the grid-connected interface is connected to the AC bus via a first relay; Intelligent interface: The intelligent interface is connected to the AC bus via a second relay; The first grid-connected output interface, the second grid-connected output interface, the first off-grid output interface, and the second off-grid output interface are used to connect to the energy storage inverter. The first grid-connected output interface and the second grid-connected output interface are connected to the AC bus via a third relay. The first off-grid output interface is connected to the AC bus via a fourth relay. The second off-grid output interface is connected to the AC bus via a fifth relay. First load interface and second load interface: used to connect loads. The first load interface is directly connected to the AC bus, and the second load interface is connected to the AC bus through the sixth relay. Control unit: Used to collect voltage at each interface, collect current at the grid-connected input interface, smart interface, first load interface, and second load interface, obtain the type of external device, and control the opening and closing of each relay based on feedback of voltage, current, and device type.

2. The intelligent backup power topology according to claim 1, characterized in that: The fifth and sixth relays are simultaneously connected to the AC bus via the seventh relay.

3. The intelligent backup power topology according to claim 1 or 2, characterized in that: The grid-connected input interface, intelligent interface, first grid-connected output interface, second grid-connected output interface, first off-grid output interface, second off-grid output interface, first load interface, second load interface, first relay, second relay, third relay, fourth relay, fifth relay, and sixth relay are all three-phase structures. The L1 and L2 interfaces of the first off-grid output interface are connected by a first switch, and the L2 and L3 interfaces of the first off-grid output interface are connected by a second switch.

4. The intelligent backup power topology according to claim 1, characterized in that: The control unit includes: Voltage acquisition module: used to acquire the voltage at each interface; Current acquisition module: used to acquire the current at the grid-connected input interface, intelligent interface, first load interface, and second load interface; External communication module: used to obtain the type of external device; Drive control module: connected to the voltage acquisition module, current acquisition module, and external communication module, used to control the opening and closing of each relay based on feedback of voltage, current, and external device type; Auxiliary power module: The auxiliary power module is connected to the control unit and is used to supply power to the control unit when it is off-grid.

5. A method for intelligent backup power control, characterized in that: It is achieved through the intelligent backup power topology described in claim 2, and the method includes grid-connected mode and off-grid mode. When in grid-connected mode: close the first relay, second relay, third relay, sixth relay, and seventh relay, and open the fourth relay and fifth relay. The power grid supplies power to the load connected to the first load interface and / or the second load interface through the grid-connected input interface. When in off-grid mode: disconnect the first relay, the second relay, and the third relay, and close the fourth relay, the fifth relay, and the sixth relay. The energy storage inverter supplies power to the loads connected to the first load interface and / or the second load interface through the first off-grid output interface and the second off-grid output interface, respectively, or supplies power to the loads connected to the first load interface and / or the second load interface simultaneously.

6. The intelligent backup power control method according to claim 5, characterized in that: The off-grid modes include independent off-grid mode and parallel off-grid mode. When in standby mode: the seventh relay is disconnected, one energy storage inverter supplies power to the load connected to the first load interface through the first off-grid output interface, and the other energy storage inverter supplies power to the load connected to the second load interface through the second off-grid output interface; When in parallel off-grid mode: when the seventh relay is closed, the energy storage inverter supplies power to the loads connected to the first load interface and / or the second load interface simultaneously through the first off-grid output interface and the second off-grid output interface.

7. The intelligent backup power control method according to claim 6, characterized in that: When the smart interface is connected to a load and is in independent off-grid mode, the second relay is closed, and the energy storage inverter supplies power to the load connected to the first load interface and the smart interface simultaneously through the first off-grid output interface. When the smart interface is connected to a load and is in parallel off-grid mode, the second relay is closed, and the energy storage inverter supplies power to the load connected to the first load interface and / or the second load interface and the smart interface simultaneously through the first off-grid output interface and the second off-grid output interface.

8. The intelligent backup power control method according to claim 5, characterized in that: When the smart interface is connected to the energy storage inverter, the second relay is closed, and the energy storage inverter supplies power to the load connected to the first load interface and / or the second load interface through the smart interface.

9. A method for intelligent backup power control, characterized in that: It is achieved through the intelligent backup power topology described in claim 3, the method comprising: When any phase in the three-phase structure is abnormal, disconnect the first and third relays of the abnormal phase, and close the first or second switch. When any two phases in the three-phase structure are abnormal, the first and third relays of the abnormal phases are disconnected, and the first and second switches are closed.

10. An intelligent backup power system, comprising a backup power box, an energy storage inverter, a battery and / or a photovoltaic panel, wherein the battery and / or photovoltaic panel are connected to the energy storage inverter, characterized in that: The backup power box includes the intelligent backup power topology as described in any one of claims 1 to 4. The energy storage inverter is a single-output energy storage inverter or a dual-output energy storage inverter. The single-output energy storage inverter is connected to the first grid-connected output interface, the second grid-connected output interface, and the intelligent interface. The dual-output inverter is connected to the first grid-connected output interface, the second grid-connected output interface, the first off-grid output interface, the second off-grid output interface, and the intelligent interface.

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