Control method, control device, power supply system, and storage medium

Abstract

The application discloses a control method, a control device, a power supply system and a storage medium, and belongs to the technical field of electrical control. The method is used for controlling the device, the control device is connected with a first port of a power supply equipment, the control device is powered by the power supply equipment, the power supply equipment is connected to a power grid through a grid-connected switch, the control device is connected with the grid-connected switch, and the method comprises the following steps: acquiring a first power supply voltage of the first port in the case that the power supply equipment operates in an off-grid mode; and in the case that the first power supply voltage meets a first preset condition, a closing signal is sent to the grid-connected switch to close the grid-connected switch. The method can automatically and safely reconnect the grid-connected switch, thereby realizing automatic recovery of the system to the grid, and significantly improving the continuity of system power supply.

Description

Technical Field

[0001] This application belongs to the field of electrical control technology, and in particular relates to a control method, control device, power supply system and storage medium. Background Technology

[0002] Photovoltaic and energy storage power supply systems typically have grid-connection capabilities, allowing them to operate directly on the public power grid. When a fault occurs in the public power grid (such as a grid outage or frequency anomaly), smart meters, smart gateways, and other control devices between the system's AC output and the public grid can control the grid-connection relay to disconnect, allowing the system to operate off-grid. However, during off-grid operation, if these control devices shut down due to power loss, even if the public power grid subsequently returns to normal, the grid-connection relay will not automatically close, and the system will lose its ability to automatically reconnect to the grid. Summary of the Invention

[0003] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a control method, control device, power supply system, and storage medium that can automatically and safely reconnect the grid-connected switch, thereby realizing automatic system restoration to grid connection and significantly improving the continuity of system power supply.

[0004] In a first aspect, this application provides a control method for controlling a device connected to a first port of a power supply device, the control device being powered by the power supply device, the power supply device being connected to a power grid via a grid-connected switch, and the control device being connected to the grid-connected switch. The method includes: When the power supply equipment is operating in off-grid mode, the first power supply voltage of the first port is obtained; When the first power supply voltage meets the first preset condition, a closing signal is sent to the grid-connected switch to close the grid-connected switch.

[0005] According to the control method of this application, the control device is connected to the first port of the power supply equipment. The control device is powered by the power supply equipment. By obtaining the first power supply voltage of the first port, the risk of power failure of the control device can be identified in advance. When the first power supply voltage meets the first preset condition, a closing signal is sent to the grid connection switch to automatically and safely reconnect the grid connection switch, thereby realizing the automatic restoration of grid connection of the system and significantly improving the continuity of power supply of the system.

[0006] According to one embodiment of this application, the second port of the power supply equipment is connected to the power grid via the grid-connected switch, and the method further includes: When the power supply equipment is operating in the off-grid mode, the second AC voltage of the second port is obtained; Sending a closing signal to the grid-connected switch includes: When the first power supply voltage meets the first preset condition and the second AC voltage meets the second preset condition, the closing signal is sent to the grid-connected switch.

[0007] According to one embodiment of this application, the first preset condition includes: the first power supply voltage is less than or equal to a first voltage threshold. The second preset condition includes: the second AC voltage is less than or equal to the second voltage threshold.

[0008] According to one embodiment of this application, sending the closing signal to the grid-connected switch includes: When the first supply voltage is less than or equal to the first voltage threshold and the second AC voltage is greater than the second voltage threshold, a first control signal is sent to the power supply device to reduce the second AC voltage at the second port. When the second AC voltage is less than or equal to the second voltage threshold, the closing signal is sent to the grid-connected switch.

[0009] According to one embodiment of this application, sending the closing signal to the grid-connected switch includes: The duration during which the first power supply voltage meets the first preset condition and the second AC voltage meets the second preset condition; In response to the duration reaching a first preset duration, the closing signal is sent to the grid-connected switch.

[0010] According to one embodiment of this application, after sending a closing signal to the grid-connected switch, the method further includes: When the power supply equipment meets the operating conditions of the off-grid mode, a disconnection signal is sent to the grid-connected switch to disconnect the grid-connected switch.

[0011] Secondly, this application provides a control device connected to a first port of a power supply device, the control device being powered by the power supply device, the power supply device being connected to the power grid via a grid-connected switch, and the control device being connected to the grid-connected switch. The control device includes: The first processing module is used to obtain the first power supply voltage of the first port when the power supply equipment is operating in off-grid mode; The second processing module is used to send a closing signal to the grid-connected switch to close the grid-connected switch when the first power supply voltage meets the first preset condition.

[0012] According to one embodiment of this application, the control device is a power metering device.

[0013] Thirdly, this application provides a power supply system, including: Power supply equipment, which is connected to the power grid via a grid-connected switch; As described in the second aspect above, the control device is connected to the first port of the power supply equipment, the control device is powered by the power supply equipment, and the control device is connected to the grid-connected switch.

[0014] Fourthly, this application provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the control method described in the first aspect above.

[0015] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0016] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is one of the flowcharts illustrating the control method provided in the embodiments of this application; Figure 2 This is a schematic diagram of the control device provided in the embodiments of this application; Figure 3 This is a schematic diagram of the power supply system provided in an embodiment of this application; Figure 4 This is a second schematic flowchart of the control method provided in the embodiments of this application; Figure 5 This is the third flowchart illustrating the control method provided in the embodiments of this application; Figure 6 This is a schematic diagram of the structure of the electronic device provided in the embodiments of this application.

[0017] Figure label: Control device 200, first processing module 210, second processing module 220, Power supply equipment 300, first port 310, second port 320, grid connection switch 400, power grid 500. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0019] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0020] The control method, control device 200, power supply system, electronic equipment, and readable storage medium provided in this application will be described in detail below with reference to the accompanying drawings and through specific embodiments and application scenarios.

[0021] The control method is used in the control device 200. The subject executing the control method can be the control device 200 or a functional module or functional entity in the control device 200 that can implement the control method.

[0022] In this embodiment of the application, the control device 200 is connected to the first port 310 of the power supply device 300, and the control device 200 is powered by the power supply device 300.

[0023] For example, the operating power of the control device 200 is taken from the auxiliary power of the power supply device 300.

[0024] The power supply equipment 300 is connected to the power grid 500 through the grid connection switch 400, which enables the power supply equipment 300 to switch between grid-connected and off-grid operation modes.

[0025] In some embodiments, the second port 320 of the power supply device 300 is connected to the power grid 500 via a grid connection switch 400.

[0026] It is understood that the power supply equipment 300 is provided with a first port 310 and a second port 320. The first port 310 is connected to the control device 200 and supplies power to the control device 200. The second port 320 is connected to the power grid 500. The first port 310 can output low voltage (such as 12V) and the second port 320 can output high voltage (such as 220V).

[0027] Among them, the power supply equipment 300 can be a photovoltaic inverter, a power storage converter (PCS) and other equipment, and has the function of off-grid operation. It can maintain power supply to the control device 200 when operating in off-grid mode.

[0028] For example, the power supply device 300 is an energy storage converter. The energy storage converter draws power from the DC bus and generates a stable 12V DC power supply to the control device 200 through a step-down chopper circuit.

[0029] In actual operation, the power supply equipment 300 and the control device 200 support communication interaction.

[0030] The control device 200 is connected to the grid-connected switch 400. The control device 200 can control the on / off state of the grid-connected switch 400, thereby realizing the switching between grid-connected operation and off-grid operation modes of the power supply equipment 300.

[0031] In some embodiments, the control device 200 may be a power metering device.

[0032] In this embodiment, the power metering device (such as a smart meter) can have functions of electrical parameter acquisition, power metering, data processing and control, and the power metering device can be used to control the on / off state of the grid-connected switch 400.

[0033] In some embodiments, the control device 200 may also be a smart gateway or other devices. A smart gateway is an edge communication and data aggregation and forwarding device deployed in a power supply system. It has functions such as multi-protocol adaptation, data aggregation, edge computing and control. The smart gateway can be used to control the on / off state of the grid-connected switch 400.

[0034] This application provides a control method that can automatically and safely reconnect the grid-connected switch 400, thereby enabling the system to automatically restore grid connection and significantly improving the continuity of system power supply.

[0035] like Figure 1 As shown, the control method includes steps 110 and 120.

[0036] Step 110: When the power supply equipment 300 is operating in off-grid mode, obtain the first power supply voltage of the first port 310.

[0037] In this embodiment, the power supply equipment 300 operates in off-grid mode, the electrical connection between the power supply equipment 300 and the power grid 500 is disconnected, and the grid connection switch 400 is in the off state.

[0038] In this step, the first power supply voltage of the first port 310, which is also the input power supply voltage of the control device 200, is obtained in real time. Based on the first power supply voltage, it can be determined whether the control device 200 is about to lose power.

[0039] It should be noted that factors such as insufficient energy storage capacity, system triggering of unexpected protection actions, abnormal wiring or poor contact between power supply equipment 300 and control device 200 may cause changes in the first power supply voltage, that is, changes in the power supply status of control device 200.

[0040] In actual implementation, a voltage acquisition device, such as a voltage sensor or voltage sampling circuit, can be installed at the first port 310 or on the side of the control device 200 to acquire the first power supply voltage in real time and identify the risk of power failure of the control device 200 in advance.

[0041] Step 120: When the first power supply voltage meets the first preset condition, send a closing signal to the grid-connected switch 400 to close the grid-connected switch 400.

[0042] In this step, if the first power supply voltage meets the first preset condition, it indicates that the control device 200 is at risk of losing power and may be about to lose power. At this time, a closing signal is sent to the grid connection switch 400 to automatically and safely reconnect the grid connection switch 400. When the power grid 500 is restored later, the system can automatically restore grid connection.

[0043] In related technologies, equipping smart meters with independent backup power supplies (such as uninterruptible power supplies, UPS) can prevent smart meters from shutting down due to power failure and avoid the system losing its ability to automatically recover from grid failure. However, this approach significantly increases the system's hardware cost, size, and complexity. Furthermore, the backup power supply itself also has issues with lifespan, maintenance, and eventual depletion.

[0044] In addition, some related technologies propose to change the electricity meter to obtain working power from the grid 500 side. When the grid 500 fails, the grid 500 side loses power, causing the electricity meter to lose power at the critical moment when it needs to perform the disconnection operation, thus failing to complete the anti-islanding protection and bringing serious safety hazards.

[0045] In this embodiment, the control device 200 is connected to the first port 310 of the power supply equipment 300. The control device 200 is powered by the power supply equipment 300 and obtains the first supply voltage (i.e., input power voltage) of the first port 310 in real time. Based on the first supply voltage, the control device 200 can identify the risk of power failure in advance and send a closing signal to the grid connection switch 400 when power failure is imminent. The grid connection switch 400 is automatically and safely reconnected, so that the system can automatically restore grid connection when the power grid 500 restores power supply. Without increasing any hardware costs, the problem of permanent disconnection caused by power failure is solved. The power supply system can intelligently and safely switch back from the planned island state to the normal grid connection state, which significantly improves the power supply continuity of the system.

[0046] According to the control method provided in the embodiments of this application, the control device 200 is connected to the first port 310 of the power supply equipment 300. The control device 200 is powered by the power supply equipment 300. By obtaining the first power supply voltage of the first port 310, the risk of power failure of the control device 200 can be identified in advance. When the first power supply voltage meets the first preset condition, a closing signal is sent to the grid connection switch 400 to automatically and safely reconnect the grid connection switch 400, thereby realizing the automatic restoration of grid connection of the system and significantly improving the continuity of system power supply.

[0047] In some embodiments, the second port 320 of the power supply device 300 is connected to the power grid 500 via a grid connection switch 400, and the control method further includes: When the power supply equipment 300 is operating in off-grid mode, the second AC voltage of the second port 320 is obtained; Step 120: Send a closing signal to the grid connection switch 400, including: When the first power supply voltage meets the first preset condition and the second AC voltage meets the second preset condition, a closing signal is sent to the grid-connected switch 400.

[0048] It is understandable that the second port 320 is connected to the power grid 500 through the grid connection switch 400, and the second AC voltage of the second port 320 is also the AC output voltage of the power supply equipment 300.

[0049] In this embodiment, when the power supply device 300 is operating in off-grid mode, it acquires the first power supply voltage of the first port 310 and the second AC voltage of the second port 320 in real time. Combining the first power supply voltage and the second AC voltage, it determines whether to send a closing signal to the grid-connected switch 400.

[0050] The first power supply voltage meets the first preset condition, indicating that the control device 200 is at risk of losing power and may lose power soon; the second AC voltage meets the second preset condition, which can ensure that the grid-connected switch 400 can be connected safely and reliably. The power supply equipment 300 currently has no AC output or the output voltage is small. Closing the grid-connected switch 400 will not cause impact or interference to the power grid 500. At the same time, it can also prevent the output voltage of the power supply equipment 300 from being sent back to the power grid 400, which could cause a safety accident.

[0051] In this embodiment, by using the dual criteria of the first power supply voltage and the second AC voltage, the grid-connected switch 400 is automatically and safely reconnected at the critical moment when the control device 200 is about to lose power, thereby realizing the automatic restoration of the system to the grid when the power grid 500 restores power supply, significantly improving the power supply continuity of the system.

[0052] In some embodiments, the first preset condition includes: the first supply voltage is less than or equal to the first voltage threshold.

[0053] The first voltage threshold can be set according to the power supply voltage provided by the power supply equipment 300 to the control device 200, and is used to determine whether the control device 200 is at risk of power failure. When the first power supply voltage is less than or equal to the first voltage threshold, the control device 200 is at risk of power failure.

[0054] In some embodiments, the second preset condition includes: the second AC voltage is less than or equal to the second voltage threshold.

[0055] The second voltage threshold can be set according to the voltage conditions required for the safe closing of the grid-connected switch 400, and is used to determine whether the grid-connected switch 400 has the conditions for safe closing.

[0056] For example, the preset first voltage threshold is V. input-thres，预 Let the second voltage threshold be V acout-thres .

[0057] When a fault occurs in the power grid 500, the control device 200 disconnects the grid connection switch 400, and the power supply equipment 300 enters off-grid mode, acquiring the first power supply voltage V in real time. input and the second AC voltage V acout If V input ≤V input-thres And V acout ≤V acout-thres The control device 200 closes the grid connection switch 400.

[0058] In some embodiments, step 120, sending a closing signal to the grid-connected switch 400, includes: When the first supply voltage is less than or equal to the first voltage threshold and the second AC voltage is greater than the second voltage threshold, a first control signal is sent to the power supply device 300 to reduce the second AC voltage of the second port 320. When the second AC voltage is less than or equal to the second voltage threshold, a closing signal is sent to the grid-connected switch 400.

[0059] The first control signal can be a power-off signal or a control signal to reduce output power. After receiving the first control signal, the power supply equipment 300 responds to the first control signal by powering off or reducing output power, thereby reducing the second AC voltage of the second port 320.

[0060] In this embodiment, if the first supply voltage is less than or equal to the first voltage threshold, the control device 200 is at risk of losing power. When the second AC voltage is greater than the second voltage threshold, a first control signal is sent to the power supply equipment 300 to reduce the second AC voltage at the second port 320. When the second AC voltage is reduced to less than or equal to the second voltage threshold, a closing signal is sent to the grid-connected switch 400 to automatically and safely reconnect the grid-connected switch 400, thus preventing the output voltage of the power supply equipment 300 from being reversed to the power grid 400 and causing a safety accident.

[0061] In some embodiments, step 120, sending a closing signal to the grid-connected switch 400, includes: The duration during which the first power supply voltage meets the first preset condition and the second AC voltage meets the second preset condition; In response to the duration reaching the first preset duration, a closing signal is sent to the grid-connected switch 400.

[0062] In this embodiment, the duration for which the first power supply voltage meets the first preset condition and the second AC voltage meets the second preset condition is accumulated. When the duration reaches the first preset duration, a closing signal is sent to the grid-connected switch 400 to avoid malfunction of the grid-connected switch 400 and improve the safety and reliability of the system.

[0063] In actual implementation, window counting, timers, and other methods can be used to determine whether the duration for which the first power supply voltage meets the first preset condition and the second AC voltage meets the second preset condition has reached the first preset duration.

[0064] For example, the preset first voltage threshold is V. input-thres The second voltage threshold is V acout-thres .

[0065] When the power supply equipment 300 is operating in off-grid mode, it obtains the first supply voltage V in real time. input and the second AC voltage V acout If V input ≤V input-thres And V acout ≤V acout-thres The system determines that it has entered the safe recovery window. The window count is continuously accumulated, which is the duration during which the first power supply voltage meets the first preset condition and the second AC voltage meets the second preset condition.

[0066] When the safety window count reaches the preset threshold, i.e., the duration reaches the first preset duration, the intelligent switching action is triggered, and a closing signal is sent to the grid-connected switch 400 to control the grid-connected switch 400 to switch from the open state to the closed state.

[0067] In some embodiments, after sending a closing signal to the grid-connected switch 400, the control method may further include: When the power supply equipment 300 meets the operating conditions of off-grid mode, a disconnection signal is sent to the grid-connected switch 400 to disconnect the grid-connected switch 400.

[0068] It should be noted that when there is a risk of power loss, the control device 200 sends a closing signal to the grid-connected switch 400. The presence of a risk of power loss indicates that the power supply to the power supply equipment 300 is abnormal and may not be able to continue to support the normal operation of the off-grid mode. The power supply equipment 300 and the control device 200 support communication interaction. The control device 200 can obtain the operating status information of the power supply equipment 300 and determine whether the power supply equipment 300 can be restored to the off-grid mode.

[0069] In this embodiment, after sending a closing signal to the grid-connected switch 400, when the power supply equipment 300 meets the operating conditions of the off-grid mode, that is, when the power supply equipment 300 has the off-grid output capability again, a disconnect signal is sent to the grid-connected switch 400 to disconnect the grid-connected switch 400, and the power supply equipment 300 restores the power supply to the control device 200 and the load in the system, while effectively reducing the safety risk of reverse power transmission.

[0070] Taking the control device 200 as a smart meter and the power supply equipment 300 as a PCS as an example.

[0071] like Figure 4 As shown, the power supply equipment 300 supports on-grid and off-grid switching. When the PCS is running on-grid, if the grid 500 fails, the grid connection switch 400 will be disconnected, and the PCS will run off-grid. If the grid 500 is restored later, the smart meter can connect the grid connection switch 400 to restore on-grid operation. If the PCS has off-grid output capability, the PCS will run off-grid.

[0072] Among them, the PCS having off-grid output capability means that the PCS can output AC voltage normally and the bus voltage is normal, the energy storage capacity is relatively healthy, and it can supply power to smart meters.

[0073] like Figure 5 As shown, during the grid-connected operation of the PCS, when a fault occurs in the power grid 500, the smart meter controls the grid connection switch 400 to open, and the PCS enters the off-grid operation mode, acquiring the first supply voltage V in real time. input and the second AC voltage V acout .

[0074] The preset first voltage threshold is V input-thres The second voltage threshold is V acout-thres .

[0075] The smart meter detected a drop in the input power voltage, i.e., V. input ≤V input-thres Determine whether the AC output voltage of the PCS is greater than the second voltage threshold.

[0076] If the PCS does not have off-grid output capability, the inverter output AC voltage will be lower than the detection threshold, i.e., V. acout ≤V acout-thres The system determines that the device has entered the safe recovery window. The window count continuously accumulates, and once the threshold is reached, the smart meter triggers the grid connection switch 400.

[0077] If the PCS still has off-network output capability, then V acout >V acout-thres The smart meter sends a shutdown command to the PCS, and then enters V again. acout With V acout-thres Comparison of size relationships.

[0078] If the grid 500 has been restored at this time, the grid 500 will supply power to the load through the closed switch, and the system will automatically restore grid connection. If the grid 500 continues to fail to restore, when the inverter has the ability to output off-grid again, the grid connection metering control device 200 will disconnect the grid connection switch 400, and the inverter will start off-grid to supply power to the load.

[0079] In this embodiment, the moment when the control device 200 is about to lose power can be predicted in advance. In scenarios such as insufficient energy storage, system triggering of unexpected protection actions, abnormal lines or poor contact between the power supply equipment 300 and the control device 200, the grid connection switch 400 can be automatically and safely reconnected, thereby realizing automatic system grid connection restoration, significantly improving the continuity of system power supply, and effectively reducing the safety risk of reverse power transmission.

[0080] This application embodiment also provides a control device 200, which is connected to the first port 310 of the power supply equipment 300. The control device 200 is powered by the power supply equipment 300, which is connected to the power grid 500 through a grid-connected switch 400. The control device 200 is connected to the grid-connected switch 400.

[0081] like Figure 2 As shown, the control device 200 includes: The first processing module 210 is used to obtain the first power supply voltage of the first port 310 when the power supply equipment 300 is operating in off-grid mode; The second processing module 220 is used to send a closing signal to the grid-connected switch 400 to close the grid-connected switch 400 when the first power supply voltage meets the first preset condition.

[0082] In some embodiments, the control device 200 may be a power metering device.

[0083] In this embodiment, the power metering device (such as a smart meter) can have functions of electrical parameter acquisition, power metering, data processing and control, and the power metering device can be used to control the on / off state of the grid-connected switch 400.

[0084] In some embodiments, the control device 200 may also be a smart gateway or other devices. A smart gateway is an edge communication and data aggregation and forwarding device deployed in a power supply system. It has functions such as multi-protocol adaptation, data aggregation, edge computing and control. The smart gateway can be used to control the on / off state of the grid-connected switch 400.

[0085] According to the control device 200 provided in the embodiments of this application, the control device 200 is connected to the first port 310 of the power supply equipment 300. The control device 200 is powered by the power supply equipment 300. By obtaining the first power supply voltage of the first port 310, the risk of power failure of the control device 200 can be identified in advance. When the first power supply voltage meets the first preset condition, a closing signal is sent to the grid connection switch 400 to automatically and safely reconnect the grid connection switch 400, thereby realizing the automatic restoration of grid connection of the system and significantly improving the continuity of system power supply.

[0086] In some embodiments, the second port 320 of the power supply device 300 is connected to the power grid 500 through the grid-connected switch 400, and the first processing module 210 is further configured to: obtain the second AC voltage of the second port 320 when the power supply device 300 is operating in off-grid mode; The second processing module 220 is used to send a closing signal to the grid-connected switch 400, including: When the first power supply voltage meets the first preset condition and the second AC voltage meets the second preset condition, a closing signal is sent to the grid-connected switch 400.

[0087] In some embodiments, the first preset condition includes: the first supply voltage is less than or equal to a first voltage threshold; The second preset condition includes: the second AC voltage is less than or equal to the second voltage threshold.

[0088] In some embodiments, the second processing module 220 is used to send a closing signal to the grid-connected switch 400, including: When the first supply voltage is less than or equal to the first voltage threshold and the second AC voltage is greater than the second voltage threshold, a first control signal is sent to the power supply device 300 to reduce the second AC voltage of the second port 320. When the second AC voltage is less than or equal to the second voltage threshold, a closing signal is sent to the grid-connected switch 400.

[0089] In some embodiments, the second processing module 220 is used to send a closing signal to the grid-connected switch 400, including: The duration during which the first power supply voltage meets the first preset condition and the second AC voltage meets the second preset condition; In response to the duration reaching the first preset duration, a closing signal is sent to the grid-connected switch 400.

[0090] In some embodiments, after sending a closing signal to the grid-connected switch 400, the second processing module 220 is further configured to: When the power supply equipment 300 meets the operating conditions of off-grid mode, a disconnection signal is sent to the grid-connected switch 400 to disconnect the grid-connected switch 400.

[0091] The control device 200 provided in this application embodiment can realize the various processes implemented in the above control method embodiment, and will not be described again here to avoid repetition.

[0092] This application also provides a power supply system.

[0093] like Figure 3 As shown, the power supply system includes a power supply device 300 and a control device 200 as described above. The power supply device 300 is connected to the power grid 500 through a grid connection switch 400. The control device 200 is connected to the first port 310 of the power supply device 300. The control device 200 is powered by the power supply device 300 and is connected to the grid connection switch 400.

[0094] According to the power supply system provided in the embodiments of this application, the control device 200 is connected to the first port 310 of the power supply equipment 300. The control device 200 is powered by the power supply equipment 300. By obtaining the first power supply voltage of the first port 310, the risk of power failure of the control device 200 can be identified in advance. When the first power supply voltage meets the first preset condition, a closing signal is sent to the grid connection switch 400 to automatically and safely reconnect the grid connection switch 400, thereby realizing the automatic restoration of grid connection of the system and significantly improving the continuity of system power supply.

[0095] The following are some specific implementation examples.

[0096] The power supply system includes a split-phase 12kW residential energy storage inverter with a DC bus voltage range of 400V-600V and a built-in auxiliary power module that can output 12V DC power to supply power to smart meters.

[0097] The smart meter operates within a voltage range of 1.7V-3.6V and is equipped with voltage detection circuit 1 and voltage detection circuit 2. Voltage detection circuit 1 monitors the 12V input supply voltage, and voltage detection circuit 2 detects the AC output voltage of the energy storage inverter. A magnetic latching relay is used as the grid-connected switch 400.

[0098] Example 1: 500-hour power outage in the power grid.

[0099] At time T0, the power grid experiences a 500 fault, the smart meter disconnects from the grid connection switch at 400, and the inverter disconnects from the grid.

[0100] From time T1 to time T2, the energy storage battery discharges, the inverter output is normal, and the smart meter detects the 12V auxiliary power supply voltage V. input normal.

[0101] At time T2, the energy storage battery has low power, the inverter stops AC output, the AC output voltage drops rapidly, and the smart meter V... acout The reading dropped rapidly.

[0102] At time T3, the battery energy is about to be depleted, the DC bus voltage begins to drop, and the inverter's 12V auxiliary power output V... input It begins to decline until it falls below the auxiliary source undervoltage threshold V. input-thres .

[0103] From time T3 to time T4, V input With V acout If all values ​​are below the corresponding threshold, the number of safety monitoring windows begins to accumulate. The duration of this window depends on the DC bus capacitance and load, and is typically tens to hundreds of milliseconds.

[0104] At time T4, when the number of safety windows reaches the preset number, the window is deemed valid, and the smart meter applies a positive pulse to the relay coil, driving the grid-connected switch 400 to close.

[0105] After time T4, sunlight returned the next day, and the inverter's DC bus voltage recovered. At this time, the smart meter's 12V power supply was normal, and a 500V continuous fault was detected in the power grid. The grid connection switch 400 was disconnected, the inverter started off-grid, and the load operated normally.

[0106] Example 2: Short-term power outage of the power grid.

[0107] At time T0, the power grid experiences a 500 fault, the smart meter disconnects from the grid connection switch at 400, and the inverter disconnects from the grid.

[0108] From time T1 to time T2, the energy storage battery discharges, the inverter output is normal, and the smart meter detects the 12V auxiliary power supply voltage V. input normal.

[0109] At time T2, the energy storage battery has low power, the inverter stops AC output, the AC output voltage drops rapidly, and the smart meter V... acout The reading dropped rapidly.

[0110] From time T3 to time T4, V input With V acout When all values ​​are below the corresponding threshold, the number of security monitoring windows begins to accumulate.

[0111] At time T4, when the number of safety windows reaches the preset number, the window is deemed valid, and the smart meter applies a positive pulse to the relay coil, driving the grid-connected switch 400 to close.

[0112] After time T4, the grid voltage drops to 500V, the inverter's DC bus voltage recovers, and the smart meter draws 12V power normally. It detects that the grid voltage has returned to normal and keeps the grid connection switch 400 connected. The inverter starts up and the load runs normally.

[0113] Example 3: The 12V input power line of the smart meter is open-circuited.

[0114] At time T0, the power grid experiences a 500 fault, the smart meter disconnects from the grid connection switch at 400, and the inverter disconnects from the grid.

[0115] From time T1 to time T2, the energy storage battery discharges, the inverter output is normal, and the smart meter detects the 12V auxiliary power supply voltage V. input normal.

[0116] At time T2, the 12V input power line of the smart meter is open-circuited, and the smart meter detects the 12V auxiliary power supply voltage V. input The inverter's AC output voltage V drops simultaneously. acout Normal. Immediately send a shutdown command to the inverter.

[0117] At time T3, the battery energy remains healthy, the DC bus voltage does not drop, the inverter receives a shutdown command and stops AC output, and the AC output voltage drops rapidly. acout Rapidly dropped below the detection threshold V acout-thres .

[0118] From time T3 to time T4, V input With V acout When all values ​​are below the corresponding threshold, the number of security monitoring windows begins to accumulate.

[0119] At time T4, when the number of safety windows reaches the preset number, the window is deemed valid, and the smart meter applies a positive pulse to the relay coil, driving the grid-connected switch 400 to close.

[0120] After T4, the grid voltage returned to 500, the inverter's DC bus voltage was normal, the smart meter's input power line was connected, the smart meter's 12V power supply was normal, the grid voltage was detected to have returned to normal, the grid connection switch 400 was kept connected, the inverter started up and connected to the grid, and the load operated normally.

[0121] In some embodiments, such as Figure 6As shown, this application embodiment also provides an electronic device 600, including a processor 601, a memory 602, and a computer program stored in the memory 602 and executable on the processor 601. When the program is executed by the processor 601, it implements the various processes of the above-described control method embodiments and can achieve the same technical effects. To avoid repetition, it will not be described again here.

[0122] It should be noted that the electronic devices in the embodiments of this application include the mobile electronic devices and non-mobile electronic devices described above.

[0123] This application also provides a non-transitory computer-readable storage medium storing a computer program. When the computer program is executed by a processor, it implements the various processes of the above-described control method embodiments and achieves the same technical effect. To avoid repetition, it will not be described again here.

[0124] The processor is the processor in the electronic device described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk.

[0125] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the above-described control method.

[0126] The processor is the processor in the electronic device described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk.

[0127] This application embodiment also provides a chip, which includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run programs or instructions to implement the various processes of the above control method embodiments and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0128] It should be understood that the chip mentioned in the embodiments of this application may also be referred to as a system-on-a-chip, system chip, chip system, or system-on-a-chip, etc.

[0129] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0130] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the related technology, can be embodied in the form of a computer software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0131] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

[0132] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0133] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A control method, characterized in that, The method is used for a control device, the control device being connected to a first port of a power supply device, the control device being powered by the power supply device, the power supply device being connected to the power grid via a grid-connected switch, and the control device being connected to the grid-connected switch. The method includes: When the power supply equipment is operating in off-grid mode, the first power supply voltage of the first port is obtained; When the first power supply voltage meets the first preset condition, a closing signal is sent to the grid-connected switch to close the grid-connected switch.

2. The control method according to claim 1, characterized in that, The second port of the power supply equipment is connected to the power grid via the grid-connected switch, and the method further includes: When the power supply equipment is operating in the off-grid mode, the second AC voltage of the second port is obtained; Sending a closing signal to the grid-connected switch includes: When the first power supply voltage meets the first preset condition and the second AC voltage meets the second preset condition, the closing signal is sent to the grid-connected switch.

3. The control method according to claim 2, characterized in that, The first preset condition includes: the first supply voltage is less than or equal to the first voltage threshold; The second preset condition includes: the second AC voltage is less than or equal to the second voltage threshold.

4. The control method according to claim 3, characterized in that, Sending the closing signal to the grid-connected switch includes: When the first supply voltage is less than or equal to the first voltage threshold and the second AC voltage is greater than the second voltage threshold, a first control signal is sent to the power supply device to reduce the second AC voltage at the second port. When the second AC voltage is less than or equal to the second voltage threshold, the closing signal is sent to the grid-connected switch.

5. The control method according to claim 2, characterized in that, Sending the closing signal to the grid-connected switch includes: The duration during which the first power supply voltage meets the first preset condition and the second AC voltage meets the second preset condition; In response to the duration reaching a first preset duration, the closing signal is sent to the grid-connected switch.

6. The control method according to any one of claims 1-5, characterized in that, After sending a closing signal to the grid-connected switch, the method further includes: When the power supply equipment meets the operating conditions of the off-grid mode, a disconnection signal is sent to the grid-connected switch to disconnect the grid-connected switch.

7. A control device, characterized in that, The control device is connected to the first port of the power supply equipment, and the control device is powered by the power supply equipment. The power supply equipment is connected to the power grid through a grid-connected switch, and the control device is connected to the grid-connected switch. The control device includes: The first processing module is used to obtain the first power supply voltage of the first port when the power supply equipment is operating in off-grid mode; The second processing module is used to send a closing signal to the grid-connected switch to close the grid-connected switch when the first power supply voltage meets the first preset condition.

8. The control device according to claim 7, characterized in that, The control device is a power metering device.

9. A power supply system, characterized in that, include: Power supply equipment, which is connected to the power grid via a grid-connected switch; The control device as described in claim 7 or 8 is connected to a first port of the power supply equipment, is powered by the power supply equipment, and is connected to the grid-connected switch.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the control method as described in any one of claims 1-6.

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