Multi-source power supply system, switching control method and device thereof and terminal

Abstract

The invention discloses a multi-source power supply system and a switching control method, device and terminal thereof, the multi-source power supply system is connected with a load and is provided with a plurality of power supply loops and switch assemblies, and the power supply loops are connected with a mains supply end, a standby power supply end and at least one inverter end. The control method comprises the following steps: acquiring a communication state of an inverter connected with the inverter end and a power supply state of each port; determining an operation mode according to the communication state, entering an independent mode when the communication connection state is communication disconnection, and entering a cooperative mode when the communication connection state is communication connection; when the operation mode is an independent mode, the switch assembly is controlled according to the power supply state and preset mutual exclusion logic; and when the operation mode is the cooperative mode, the switch assembly is controlled according to the operation data fed back by the inverter end, the power supply state and the preset mutual exclusion logic. Manual operation risks are effectively reduced, operation is safe, stable and efficient, and meanwhile the range of combined equipment capable of being selected by a user is expanded.

Description

Technical Field

[0001] This invention relates to the field of junction box technology, and more specifically to multi-source power supply systems and their switching control methods, devices and terminals. Background Technology

[0002] In the current technological landscape, publicly available multi-channel on-grid and off-grid relay automatic switching control solutions possess certain basic functions. They typically involve setting up multiple manual control relays within the junction box, using circuit breakers or air switches, while also supporting multiple power supply connections. Data monitoring can be achieved through applications or web pages, and they are compatible with AC / DC hybrid wiring modes, meeting basic power connection and data viewing needs.

[0003] However, existing technologies do not support automatic relay control and lack a unified, systematic control capability. They largely rely on manual operation for relay switching, which is not only inefficient but also ill-suited to complex and ever-changing power supply scenarios. Furthermore, existing technologies cannot establish effective communication connections with devices such as inverters, failing to form a complete collaborative system. This results in insufficient overall coordination and efficiency in power dispatching, hindering optimal energy allocation. Users also need to manually set various parameters for AC / DC meters, increasing the operational threshold and making them susceptible to safety hazards due to human error. This also increases user difficulty and maintenance costs.

[0004] Therefore, how to overcome the shortcomings of existing technologies with effective methods has become an urgent technical problem to be solved. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a multi-source power supply system and its switching control method, device, and terminal.

[0006] The technical solution of this invention is: a switching control method for a multi-source power supply system, wherein the multi-source power supply system is connected to a load and is provided with a plurality of power supply circuits for supplying power to the load and a switching assembly for switching the power supply circuits, wherein the power supply circuit is connected to a mains power terminal, a backup power supply terminal and at least one inverter terminal; the control method includes the following steps:

[0007] S1: Obtain the communication status of the inverter connected to the inverter terminal and the power supply status of each port, wherein the communication status is either communication connected or communication disconnected; S2: Determine the operating mode based on the communication status. The operating mode includes a cooperative mode and an independent mode. When the communication connection status is disconnected, enter the independent mode. When the communication connection status is connected, enter the cooperative mode. S3: When the operating mode is independent mode, the switching component is controlled according to the power supply status and preset mutual exclusion logic; when the operating mode is cooperative mode, the switching component is controlled according to the operating data fed back from the inverter, the power supply status and preset mutual exclusion logic.

[0008] As an improvement of this embodiment of the invention, the power supply state is normal or power failure; the power supply circuit is also connected to the inverter black start terminal, which is used to close the switch component corresponding to the inverter black start terminal when the power supply state of both the mains power terminal and the backup power supply terminal is power failure and the inverter communication state is communication connection.

[0009] As an improvement of this embodiment of the invention, the preset mutual exclusion logic is a switching component that can only close one power supply circuit at a time.

[0010] As an improvement of this embodiment of the invention, the multi-source power supply system is also connected to a smart load, and the power supply circuit is also used to supply power to the smart load; in step S3, the user-set working mode is obtained, and the switching component is controlled based on the working mode, the running mode and the preset mutual exclusion logic.

[0011] As an improvement of this embodiment of the invention, the working mode includes a timed mode and a green mode; the timed mode controls the intelligent load to connect to the multi-source power supply system within a preset time period; the green mode controls the intelligent load to connect to the multi-source power supply system when the inverter is detected to have sufficient power and surplus power.

[0012] As an improvement of this embodiment of the invention, the multi-source power supply system is also connected to a monitoring device for monitoring the operating data of the load.

[0013] As an improvement to this embodiment of the invention, the monitoring device is a smart meter.

[0014] To achieve one of the above-mentioned objectives, one embodiment of the present invention provides a multi-source power supply system, comprising: multiple connection ports for connecting to mains power, backup power, and an inverter, respectively; a switching assembly for switching the connection between the connection ports and the load; and a controller connected to the switching assembly for executing the method described in any of the preceding embodiments.

[0015] To achieve one of the above-mentioned objectives, one embodiment of the present invention provides a control device for a multi-source power supply system. The multi-source power supply system is connected to a load and includes several power supply circuits for supplying power to the load and switching components for switching these power supply circuits. Each power supply circuit is connected to a mains power terminal, a backup power supply terminal, and at least one inverter terminal. The control device includes the following modules: The status acquisition module is used to acquire the communication status of the inverter connected to the inverter terminal and the power supply status of each port, wherein the communication status is either communication connected or communication disconnected. The mode determination module is used to determine the operating mode based on the communication status. The operating mode includes a cooperative mode and an independent mode. When the communication connection status is disconnected, the module enters the independent mode. When the communication connection status is connected, the module enters the cooperative mode. The switch control module is used to control the switch component according to the power supply status and preset mutual exclusion logic when the operating mode is independent mode; and to control the switch component according to the operating data fed back from the inverter, the power supply status and preset mutual exclusion logic when the operating mode is cooperative mode.

[0016] To achieve one of the above-mentioned objectives, one embodiment of the present invention provides an electronic terminal, including a processor and a memory, wherein the memory stores program instructions, and when the processor executes the program instructions, it implements the switching control method of the multi-source power supply system as described in any of the preceding claims.

[0017] The multi-source power supply system and its switching control method, device and terminal provided in the embodiments of the present invention have the following advantages: The present invention flexibly switches the operating mode by acquiring the communication status of the inverter end and the power supply status of each port, and controls the switching components based on preset mutual exclusion logic, thereby realizing the intelligent switching of mains power, backup power and inverter multi-power supply circuits, effectively reducing the risk of human operation, and ensuring safe, stable and efficient operation, while expanding the range of combination equipment that users can choose. Attached Figure Description

[0018] Figure 1 This is a flowchart illustrating the switching control method for the multi-source power supply system described in this invention. Figure 2 This is a connection diagram of an embodiment of the multi-source power supply system described in this invention; Figure 3 This is a connection diagram of another embodiment of the multi-source power supply system described in this invention; Figure 4 This is a schematic diagram of the circuit connection of the multi-source power supply system described in this invention; Figure 5 This is a schematic diagram of the control device for the multi-source power supply system described in this invention; Figure 6 This is a schematic diagram of the structure of the electronic terminal described in this invention. Detailed Implementation

[0019] The present invention will now be described in detail with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the scope of protection of the present invention.

[0020] If the present invention involves orientation (e.g., up, down, left, right, front, back, outside, inside, etc.) when described, then the orientations involved need to be defined.

[0021] The scope of the embodiments described herein includes the entire scope of the claims and all available equivalents thereof. Throughout this document, the terms “first,” “second,” etc., are used only to distinguish one element from another without requiring or implying any actual relationship or order between the elements. Indeed, a first element can also be referred to as a second element, and vice versa. Furthermore, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a structure, apparatus, or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a structure, apparatus, or device. Without further limitations, an element defined by the phrase “comprising one…” does not exclude the presence of other identical elements in the structure, apparatus, or device that includes said element. The various embodiments described herein are presented in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably.

[0022] The terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" used in this document to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing this document and simplifying the description. They 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, and therefore should not be construed as limiting the invention. In the description herein, unless otherwise specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two elements, or direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0023] This invention provides a switching control method for a multi-source power supply system, such as... Figure 2 and Figure 4As shown, a load Load is connected to the bus BUS of the multi-source power supply system, and several power supply circuits for supplying power to the load Load and switching components KM1~KMn+2 for switching the power supply circuits are provided. The power supply circuit is connected to the mains terminal GRID, the backup power terminal Gen and at least one inverter terminal INV. Here, the number of inverter terminals INV is n, which are INV1~INVn, and n is a positive integer. In some specific embodiments, the multi-source power supply system is also connected to a smart load monitoring device Mon and an inverter black start terminal. Specifically, the monitoring device of the present invention is a smart meter used to monitor the operating data of the load. The inverter black start terminal is used to close the switching component corresponding to the inverter black start terminal when the power supply status of both the mains power terminal and the backup power supply terminal is off and the inverter communication status is connected.

[0024] Here, the inverter's black start terminal is used to trigger the inverter to enter off-grid mode and initiate the black start procedure when both the mains port and the backup power port detect a power outage. The multi-source power supply system interacts with the inverter in real time via a communication module. When it determines that both the mains port and the backup power port are interrupted, it sends a black start request signal to the inverter. Upon receiving the signal, the inverter automatically outputs stable starting power and connects to the multi-source power supply system through the black start terminal. At this time, the relay management and control system of the multi-source power supply system will, according to preset logic, prioritize closing the relay corresponding to the black start terminal, while simultaneously disconnecting the switching components at the mains port and the backup power port.

[0025] During the power supply process, the multi-source power supply system monitors the power supply parameters of the black start terminal in real time through smart meters and feeds them back to the inverter and its own numerical calculation system to dynamically adjust the power supply output to match the load demand.

[0026] Once the mains or backup power supply is restored, the multi-source power supply system communicates with the inverter to confirm grid connection conditions. After the grid connection requirements are met, the power supply circuit is switched according to the collaborative mode logic: if the mains power is restored, the black start relay is disconnected, the mains relay is closed, and the inverter switches to grid-connected mode; if the backup power supply is restored, the system similarly switches to the backup power supply circuit, the black start relay automatically exits operation and enters standby mode, waiting for the next trigger. In essence, the inverter's black start terminal solves the problem of traditional junction boxes failing to start when there is no external power, improving power supply continuity.

[0027] like Figure 1 As shown, the control method includes the following steps: S1: Obtain the communication status of the inverter connected to the inverter terminal and the power supply status of each port. The communication status is either communication connected or communication disconnected, and the power supply status is either normal or power off.

[0028] In practice, the multi-source power supply system establishes a communication connection with the inverter through a built-in communication module, and monitors the continuity of the communication link in real time to determine the communication status. Simultaneously, the multi-source power supply system collects power parameters in real time from the mains power terminal, backup power terminal, inverter terminal, and inverter black start terminal through connected smart meters and voltage and current detection units at each port. The system determines the power supply status of each port based on whether the power parameters are within a preset normal range. When the parameters are within the preset range, the power supply status is considered normal; otherwise, it is considered a power outage.

[0029] S2: Determine the operating mode based on the communication status. Operating modes include cooperative mode and independent mode. Independent mode is entered when the communication status is disconnected, and cooperative mode is entered when the communication status is connected. Specifically, the central processing unit in the multi-source power supply system receives the communication status data obtained in step S1 and performs logical judgment. If a communication link is detected as disconnected and no valid communication signal is transmitted, an independent mode operating command is triggered. If a communication link is detected as unobstructed and signals from the inverter are continuously received, a cooperative mode operating command is triggered, completing the switching and determination of the operating mode.

[0030] S3: When the operating mode is independent, the switching components are controlled according to the power supply status and preset mutual exclusion logic; when the operating mode is cooperative, the switching components are controlled according to the power supply status and preset mutual exclusion logic based on the operating data fed back from the inverter. Specifically, the preset mutual exclusion logic means that the switching components can only close one power supply circuit at a time. This is to avoid circuit conflicts and safety risks caused by multiple power supply circuits being turned on simultaneously.

[0031] In independent mode, the multi-source power supply system prioritizes detecting the power supply status of the mains power supply. If the mains power supply status is normal, it controls the corresponding switch component to close, while keeping the corresponding switch components of the backup power supply, inverter, and inverter black start terminal open, supplying power to the load through the mains power. If the mains power supply status is down, it detects the power supply status of the backup power supply. If the backup power supply status is normal, it controls the corresponding switch component to close, while the other related switch components are open, supplying power to the load through the backup power supply. If both the mains power supply and backup power supply status are down, because it is in independent mode, the inverter black start terminal does not function, the multi-source power supply system keeps all power supply circuit switch components open, and issues a power supply abnormality prompt through the built-in alarm module.

[0032] In collaborative mode, the multi-source power supply system receives real-time operational data from the inverter, including the inverter's grid-connected status, off-grid status, and power output. If the inverter's operational data indicates normal grid connection and the mains power supply status is normal, the system controls the corresponding mains power switch to close. Simultaneously, according to preset mutual exclusion logic, the system disconnects the switch corresponding to the black start terminal of the inverter on the backup power supply side, allowing the inverter and mains power to collaboratively supply power to the load. If the inverter's operational data indicates normal grid connection to the backup power supply and the backup power supply status is normal, the system controls the corresponding backup power supply switch to close and disconnects the switch corresponding to the black start terminal of the inverter on the mains power supply side, allowing the inverter and backup power supply to collaboratively supply power. If both the mains power supply and backup power supply status are normal, the inverter selects the optimal power supply circuit based on its own operational data. The multi-source power supply system controls the corresponding switch to close based on the inverter's selection, while the others are disconnected. If the mains power supply status switches from normal to off-grid, the inverter instantly disconnects the corresponding switch on the mains side, and enters off-grid mode to supply power to the load. Simultaneously, if the user uses a backup power supply, it can be started automatically or manually. Once the backup power supply is running normally and stable, the inverter's feedback data shows that it can be normally connected to the grid, and the backup power supply status is normal. Then, the corresponding switch on the backup power supply side is closed, and the inverter and backup power supply work together to provide power. In practice, the backup power supply can be a generator. It is understood that after the mains power is disconnected, the inverter first enters off-grid mode, then starts the backup power supply and waits for it to stabilize before connecting to the backup power supply, ensuring continuous power supply to the load.

[0033] In some specific embodiments, such as Figure 3 As shown, the multi-source power supply system is also connected to a smart load EV, and the power supply circuit is also used to supply power to the smart load EV; here, the smart load EV can be a smart charging pile or a heat pump, etc.

[0034] In step S3, the user-defined operating mode is obtained, and the power supply equipment and switching components are controlled based on the operating mode and preset mutual exclusion logic. Here, the operating mode includes a timed mode and a green mode. The user can set the required operating mode through the external control terminal of the multi-source power supply system or a remote control platform. The central processing unit of the multi-source power supply system receives and stores the user-defined operating mode information.

[0035] When the user sets the system to timed mode, the central processing unit extracts the preset time period parameter and, in conjunction with the current operating mode and preset mutual exclusion logic, controls the connection between the smart load and the multi-source power supply system. In independent mode, within the preset time period, if the corresponding power supply circuit's switch is closed and the power supply status is normal, the switch corresponding to the smart load is closed to supply power to the smart load. After the preset time period ends, the switch corresponding to the smart load is opened. In collaborative mode, in addition to meeting the above conditions, it is also necessary to confirm that the inverter's operating data is normal and that the power supply is stable before controlling the switch corresponding to the smart load to close within the preset time period to achieve timed power supply. For example, if the smart load is a charging station, and the user sets the timed charging period to 10 PM to 6 AM the next day, during this period, the multi-source power supply system controls the connection between the charging station and the power supply circuit according to the operating mode and power supply status.

[0036] When the user sets the system to green mode, the multi-source power supply system monitors the inverter's power output in real time and uses smart meters to monitor the power generation data of renewable energy sources such as photovoltaics to determine if there is sufficient surplus power. In independent mode, if sufficient surplus power is detected from the photovoltaic system and the current power supply circuit is stable, the system controls the switch component corresponding to the smart load to close, supplying power to the smart load. In collaborative mode, the multi-source power supply system communicates with the inverter to obtain photovoltaic surplus power data. When the inverter reports sufficient surplus power, it uses preset mutual exclusion logic to control the switch component corresponding to the smart load to close, ensuring the stability of the current power supply circuit. Simultaneously, it establishes communication and mutual control with the smart load through digital input and output ports. For example, when the smart load is a heat pump, in green mode, if sufficient surplus power is detected from the photovoltaic system, the multi-source power supply system controls the switch component corresponding to the heat pump to close, supplying power to the heat pump.

[0037] The present invention also provides a multi-source power supply system, comprising: multiple connection ports for connecting to mains power, backup power, and inverter respectively; a switching assembly for switching the connection between the connection ports and the load; and a controller connected to the switching assembly for executing the method described in any of the preceding claims. In practice, the multi-source power supply system may be a smart junction box, and the controller may be a central processing unit located in the multi-source power supply system.

[0038] The present invention also provides a control device for a multi-source power supply system. The multi-source power supply system is connected to a load and includes several power supply circuits for supplying power to the load and switching components for switching these power supply circuits. Each power supply circuit is connected to a mains power terminal, a backup power terminal, and at least one inverter terminal. Figure 5 As shown, the control device includes the following modules: The status acquisition module 201 is used to acquire the communication status of the inverter connected to the inverter terminal and the power supply status of each port, wherein the communication status is either communication connected or communication disconnected. The mode determination module 202 is used to determine the operating mode according to the communication status. The operating mode includes a cooperative mode and an independent mode. When the communication connection status is disconnected, it enters the independent mode. When the communication connection status is connected, it enters the cooperative mode. The switch control module 203 controls the switch assembly according to the power supply status and preset mutual exclusion logic when the operating mode is independent mode; and controls the switch assembly according to the operating data fed back from the inverter, the power supply status and preset mutual exclusion logic when the operating mode is cooperative mode.

[0039] The present invention also provides an electronic terminal, such as Figure 6 As shown, it includes a processor and a memory, the memory storing program instructions, and when the processor executes the program instructions, it implements the switching control method of the multi-source power supply system as described in any of the above claims.

[0040] This invention can be an apparatus, method, and / or computer program product. A computer program product may include a readable storage medium having computer-readable program instructions loaded thereon for causing a processor to implement various aspects of the invention.

[0041] Storage media can be tangible devices that hold and store instructions for use by instruction execution devices. Storage media can include, but are not limited to, electrical storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, or any suitable combination thereof. More specific examples (a non-exhaustive list) of readable storage media include: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital multifunction disc (DVD), memory sticks, floppy disks, mechanical encoding devices, such as punch cards or recessed protrusions storing instructions thereon, and any suitable combination thereof.

[0042] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0043] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. All equivalent embodiments or modifications made without departing from the spirit of the present invention should be included within the scope of protection of the present invention.

Claims

1. A switching control method for a multi-source power supply system, characterized in that, A multi-source power supply system is connected to a load and is equipped with several power supply circuits for supplying power to the load and switching components for switching power supply circuits. Each power supply circuit is connected to a mains power terminal, a backup power terminal, and at least one inverter terminal. The control method includes the following steps: S1: Obtain the communication status of the inverter connected to the inverter terminal and the power supply status of each port, wherein the communication status is either communication connected or communication disconnected; S2: Determine the operating mode based on the communication status. The operating mode includes a cooperative mode and an independent mode. When the communication connection status is disconnected, enter the independent mode. When the communication connection status is connected, enter the cooperative mode. S3: When the operating mode is independent mode, the switching component is controlled according to the power supply status and preset mutual exclusion logic; when the operating mode is cooperative mode, the switching component is controlled according to the operating data fed back from the inverter, the power supply status and preset mutual exclusion logic.

2. The control method according to claim 1, characterized in that, The power supply status is normal or power failure; the power supply circuit is also connected to the inverter black start terminal, which is used to close the switch component corresponding to the inverter black start terminal when the power supply status of both the mains power terminal and the backup power terminal is power failure and the inverter communication status is communication connection.

3. The control method according to claim 1, characterized in that, The preset mutual exclusion logic is a switching component that can only close one power supply circuit at a time.

4. The control method according to claim 1, characterized in that, The multi-source power supply system is also connected to a smart load, and the power supply circuit is also used to supply power to the smart load; in step S3, the user-set working mode is obtained, and the switching component is controlled based on the working mode, the running mode and the preset mutual exclusion logic.

5. The control method according to claim 4, characterized in that, The operating modes include a timed mode and a green mode; the timed mode controls the intelligent load to connect to the multi-source power supply system within a preset time period; the green mode controls the intelligent load to connect to the multi-source power supply system when the inverter is detected to have sufficient power and surplus power.

6. The control method according to claim 1, characterized in that, The multi-source power supply system is also connected to monitoring equipment for monitoring the load's operating data.

7. The control method according to claim 1, characterized in that, The monitoring device is a smart meter.

8. A multi-source power supply system, characterized in that, include: Multiple connection ports are used to connect to mains power, backup power, and inverter, respectively; A switching assembly for switching the connection between the connection port and the load; A controller connected to the switching assembly for performing the method as described in any one of claims 1-7.

9. A control device for a multi-source power supply system, characterized in that, The multi-source power supply system is connected to a load and is equipped with several power supply circuits for supplying power to the load and switching components for switching power supply circuits. Each power supply circuit is connected to a mains power terminal, a backup power terminal, and at least one inverter terminal. The control device includes the following modules: The status acquisition module is used to acquire the communication status of the inverter connected to the inverter terminal and the power supply status of each port, wherein the communication status is either communication connected or communication disconnected. The mode determination module is used to determine the operating mode based on the communication status. The operating mode includes a cooperative mode and an independent mode. When the communication connection status is disconnected, the module enters the independent mode. When the communication connection status is connected, the module enters the cooperative mode. A switch control module is used to control the switch component according to the power supply status and preset mutual exclusion logic when the operating mode is independent mode. When the operating mode is cooperative mode, the switching components are controlled according to the operating data fed back from the inverter, the power supply status, and the preset mutual exclusion logic.

10. An electronic terminal, characterized in that, It includes a processor and a memory, the memory storing program instructions, and when the processor executes the program instructions, it implements the switching control method for a multi-source power supply system as described in any one of claims 1 to 7.

Images