Device control method, inverter and computer-readable storage medium

Abstract

The present application relates to the technical field of power. Provided are a device control method, an inverter and a computer-readable storage medium, which can improve the consistency of the SOCs of energy storage devices in a combined power grid, thereby improving the power output capacity of the combined power grid. The method is applied to an inverter of a master sub-power grid in a combined power grid, wherein the combined power grid further comprises a plurality of slave sub-power grids, each sub-power grid further comprises an energy storage device and a power generation device, and the combined power grid is used for supplying power to a load. The method comprises: acquiring the current power-supply power of a combined power grid supplying power to a load, a first load power of the load, and first information of each sub-power grid among a plurality of sub-power grids of the combined power grid, wherein the plurality of sub-power grids comprise a plurality of slave sub-power grids and a master sub-power grid, the first information comprises the state of an energy storage device, the current state of charge (SOC) of the energy storage device, and the power-generation power of a power generation device, and state information comprises a charging state or an idle state; and controlling a plurality of inverters on the basis of the current power-supply power, the first load power and a plurality of pieces of first information, such that the SOCs of a plurality of energy storage devices are the same.

Description

Equipment control methods, inverters and computer-readable storage media Technical Field

[0001] This application relates to the field of power technology, specifically to a device control method, an inverter, and a computer-readable storage medium. Background Technology

[0002] A combined power grid consists of multiple subgrids, each of which includes inverters, energy storage devices, and power generation devices. The combined power grid can supply power to the load.

[0003] To ensure the stability of the combined power grid, the state of charge (SOC) of the energy storage devices in each sub-grid needs to be consistent in order to improve the power output capacity of the combined power grid. Technical issues

[0004] One of the objectives of this application is to provide a device control method, an inverter, and a computer-readable storage medium. Technical solutions

[0005] The technical solution adopted in this application is as follows:

[0006] A first aspect provides a device control method, characterized in that the method is applied to an inverter in a master-sub-grid of a combined power grid, the combined power grid further including multiple slave sub-grids, each sub-grid further including energy storage devices and power generation devices, the combined power grid being used to supply power to a load, the method comprising: acquiring the current power supply of the combined power grid to the load, a first load power of the load, and first information of each sub-grid in the multiple sub-grids of the combined power grid; the multiple sub-grids including multiple slave sub-grids and a master sub-grid, the first information including the status of the energy storage devices, the state of charge (SOC) of the energy storage devices, and the power generation of the power generation devices, the status information including charging status or idle status; and controlling multiple inverters according to the current power supply, the first load power, and the multiple first information to make the SOC of the multiple energy storage devices the same.

[0007] Secondly, an inverter is provided for implementing the device control method of the first aspect described above. The inverter is included in a master sub-grid in a combined power grid, which also includes multiple slave sub-grids. Each sub-grid further includes energy storage devices and power generation devices. The combined power grid supplies power to a load. The inverter includes: an acquisition module and a processing module; the acquisition module is used to acquire the current power supply of the combined power grid to the load, the first load power of the load, and first information of each of the multiple sub-grids in the combined power grid; the multiple sub-grids include multiple slave sub-grids and a master sub-grid; the first information includes the status of the energy storage devices, the SOC of the energy storage devices, and the power generation power of the power generation devices; the status information includes charging status or idle status; the processing module is used to control multiple inverters according to the current power supply, the first load power, and the multiple first information, so that the SOC of the multiple energy storage devices is the same.

[0008] Thirdly, an inverter is provided, comprising: at least one processor and a memory for storing processor-executable instructions; wherein the processor is configured to execute the instructions to implement the methods provided by the first aspect and any possible implementation thereof.

[0009] Fourthly, a computer-readable storage medium is provided, which, when executed by a processor of an inverter, enables the inverter to perform the methods provided in the first aspect and any possible implementation thereof.

[0010] Fifthly, a computer program product containing instructions is provided that, when run on a computer, enables the computer to perform the methods provided in the first aspect and any possible implementation thereof.

[0011] In a sixth aspect, a chip system is provided, comprising: a processor and an interface circuit; the interface circuit being configured to receive a computer program or instructions and transmit them to the processor; the processor being configured to execute the computer program or instructions to cause the chip system to perform the methods provided in the first aspect and any of its possible embodiments. Beneficial effects

[0012] The beneficial effects of the method provided in this application embodiment are as follows: by acquiring the current power supply of the combined power grid to the load, the first load power of the load, and the first information of each sub-grid in the multiple sub-grids of the combined power grid. The multiple sub-grids include multiple slave sub-grids and a master sub-grid. The first information includes the status of the energy storage devices, the SOC of the energy storage devices, and the power generation of the generators. The status information includes charging status or idle status. Subsequently, multiple inverters can be controlled based on the current power supply, the first load power, and the multiple first information to ensure that the SOC of the multiple energy storage devices is the same, thereby improving the consistency of the SOC of the energy storage devices in the combined power grid and enhancing the power output capability of the combined power grid. Attached Figure Description

[0013] Figure 1 is a schematic diagram of the architecture of a device control system provided in this application;

[0014] Figure 2 is a flowchart illustrating a device control method provided in this application;

[0015] Figure 3 is a flowchart illustrating another equipment control method provided in this application;

[0016] Figure 4 is a flowchart illustrating another equipment control method provided in this application;

[0017] Figure 5 is a structural schematic diagram of an inverter provided in this application;

[0018] Figure 6 is a structural schematic diagram of another inverter provided in this application. Embodiments of the present invention

[0019] Figure 1 is a schematic diagram of the architecture of a device control system provided in this application. As shown in Figure 1, the device control system 10 includes a combined power grid 20 and a load 30. The combined power grid 20 is connected to the load 30 and supplies power to the load 30.

[0020] The combined power grid 20 includes a master sub-power grid 21, a first slave sub-power grid 22, and a second slave sub-power grid 23.

[0021] The main power grid 21 includes an inverter 211, an energy storage device 212, and a power generation device 213. The inverter 211 is connected to the energy storage device 212 and the power generation device 213, respectively.

[0022] The first slave power grid 22 includes an inverter 221, an energy storage device 222, and a power generation device 223. The inverter 221 is connected to the energy storage device 222 and the power generation device 223, respectively.

[0023] The second slave grid 23 includes an inverter 231, an energy storage device 232, and a power generation device 233. The inverter 231 is connected to the energy storage device 232 and the power generation device 233, respectively.

[0024] Inverter 211 is connected to inverter 221 and inverter 231 respectively, and inverter 221 is also connected to inverter 231.

[0025] In practical applications, the solutions provided in this application embodiment can be applied to the inverter 211 of the main grid 21, or to the devices included in the inverter 211 of the main grid 21.

[0026] The following description, with reference to the accompanying drawings, uses the inverter 211 of the main power grid 21 as an example to illustrate the device control method provided in this application embodiment.

[0027] Figure 2 is a flowchart illustrating a device control method provided in this application. As shown in Figure 2, the method includes the following steps:

[0028] S201, The inverter obtains the current power supply of the combined power grid to the load, the first load power of the load, and the first information of each subgrid in the multiple subgrids of the combined power grid.

[0029] The multiple sub-grids include multiple slave sub-grids and master sub-grids. The first information includes the status of the energy storage device, the current SOC of the energy storage device, and the power generation capacity of the power generation device. The status information includes charging status or idle status.

[0030] It should be noted that the state of an energy storage device can also include its discharge state.

[0031] Energy storage devices can be batteries, and power generation devices can be photovoltaic panels; this application does not impose specific restrictions on them.

[0032] As one possible implementation, referring to Figure 1, the inverter of the master subgrid receives a message sent by the inverter of each slave subgrid, which includes the first information of the slave subgrid. The inverter of the master subgrid obtains the first information of the slave subgrid from the message.

[0033] The inverter of the master grid receives a message from the load, which includes the current power supply of the combined grid to the load and the first load power of the load. The inverter of the master grid obtains the current power supply of the combined grid to the load and the first load power of the load from the message.

[0034] The inverter of the main grid detects the status of the energy storage devices, the current SOC of the energy storage devices, and the power generation of the generator devices in the main grid, and obtains the status of the energy storage devices, the current SOC of the energy storage devices, and the power generation of the generator devices.

[0035] S202, The inverter controls multiple inverters based on the current power supply, the first load power and multiple first information to make the SOC of multiple energy storage devices the same.

[0036] As one possible implementation, when the current power supply is not less than the first load power, multiple power generation capacities are the same, and the energy storage devices in the first subgrid are in a charging state, the inverter sends a first instruction message to the inverter of each of the multiple subgrids to obtain the adjusted power supply.

[0037] The first subgrid is any one of the multiple subgrids, and the first indication message is used to indicate that the energy storage device of the subgrid is fully charged, and the adjusted power supply is not less than the first load power.

[0038] As an example, the inverter of the main grid determines whether the current power supply is not less than the first load power and obtains the first judgment result; the inverter of the main grid determines whether multiple power generation powers are the same and obtains the second judgment result; the inverter of the main grid determines whether the state of each energy storage device is charging and obtains multiple third judgment results.

[0039] If the first judgment result is yes, the second judgment result is yes, and each third judgment result is yes, the inverter of the main sub-grid generates a first indication message and sends the first indication message to the inverter of each sub-grid in the multiple sub-grids.

[0040] Accordingly, the inverter of each subgrid receives the first instruction message from the inverter of the main subgrid.

[0041] Based on this possible implementation, under the conditions that the current power supply is not less than the first load power, multiple power generation capacities are the same, and the energy storage devices in each sub-grid are in a charging state, the adjusted power supply is obtained by sending a first instruction message to the inverter of each sub-grid. Since the first instruction message indicates that the energy storage devices in the sub-grid are fully charged, and the adjusted power supply is not less than the first load power, it is possible to fully charge the energy storage devices while ensuring that the load receives sufficient power, thereby improving the consistency of the SOC of the energy storage devices in the combined grid and enhancing the power output capability of the combined grid.

[0042] As another possible implementation, when the current power supply is less than the first load power, multiple power generation capacities are different, the current SOC of multiple energy storage devices is different, and the energy storage devices in the first subgrid are in a static state, the inverter sends a second instruction message to the inverter of the second subgrid, a third instruction message to the inverter of the third subgrid, and a fourth instruction message to the inverter of the fourth subgrid to obtain the adjusted power supply.

[0043] The first subgrid is any one of the multiple subgrids; the second subgrid is the subgrid whose corresponding power generation is greater than the first value; the third subgrid is the subgrid whose current SOC of the energy storage device is less than the second value; the fourth subgrid is the subgrid whose corresponding power generation is greater than the first value and whose current SOC of the energy storage device is not less than the second value; the second indication message is used to indicate that the corresponding power generation remains unchanged and the output power of the energy storage device is adjusted to the third value; the third indication message is used to indicate that the corresponding power generation remains unchanged and the output power of the inverter is adjusted to the fourth value; the fourth indication message is used to indicate that the corresponding power generation remains unchanged and the output power of the inverter is adjusted to the fifth value; if the third or fourth value is less than the fifth value, the adjusted power supply is not less than the first load power.

[0044] It should be noted that the specific values ​​of the first and second values ​​can be set independently, and this application does not impose specific restrictions on them.

[0045] As an example, the inverter of the main grid determines whether the current power supply is less than the first load power, and obtains the fourth judgment result; the inverter of the main grid determines whether multiple power generation powers are different, and obtains the fifth judgment result; the inverter of the main grid determines whether the current SOC of multiple energy storage devices are different, and obtains the sixth judgment result; the inverter of the main grid determines whether the state of each energy storage device is a static state, and obtains multiple seventh judgment results.

[0046] If the fourth, fifth, sixth, and each seventh judgment result are true, the inverter of the main sub-grid determines the sub-grid with a power generation capacity greater than the first value as the second sub-grid, then determines the third value, generates a second indication message, and sends the second indication message to the second sub-grid. The inverter of the main sub-grid determines the sub-grid with a current SOC of the energy storage device less than the second value as the third sub-grid, then determines the fourth value, generates a third indication message, and sends the third indication message to the third sub-grid. The inverter of the main sub-grid determines the sub-grid with a power generation capacity greater than the first value and a current SOC of the energy storage device not less than the second value as the fourth sub-grid, then determines the fifth value, generates a fourth indication message, and sends the fourth indication message to the fourth sub-grid.

[0047] Accordingly, the inverter of the second sub-grid receives the second instruction message from the inverter of the main sub-grid, maintains the corresponding power generation unchanged, and adjusts the output power of the energy storage device to the third value; the inverter of the third sub-grid receives the third instruction message from the inverter of the main sub-grid, maintains the corresponding power generation unchanged, and adjusts its own output power to the fourth value; the inverter of the fourth sub-grid receives the fourth instruction message from the inverter of the main sub-grid, maintains the corresponding power generation unchanged, and adjusts its own output power to the fifth value. Finally, the adjusted power supply is obtained.

[0048] It should be noted that the specific scheme for determining the third, fourth, and fifth values ​​of the inverter in the master and slave power grids in this example can refer to existing schemes, and will not be described in detail here.

[0049] Based on this possible implementation, under the following conditions: the current power supply is less than the first load power, multiple power generation capacities are different, the current SOC of multiple energy storage devices is different, and the energy storage devices in the first subgrid are in a static state, the power generation of the second subgrid is greater than the first value, the current SOC of the third subgrid is less than the second value, and the power generation of the fourth subgrid is greater than the first value while the current SOC of the energy storage devices is not less than the second value, a second indication message is sent to the inverter of the second subgrid to indicate that the corresponding power generation should remain unchanged and to adjust the output power of the energy storage devices to the third value. The inverter sends a third instruction message to keep the corresponding power generation unchanged and adjust the inverter's output power to the fourth value. It also sends a fourth instruction message to the inverter in the fourth subgrid to keep the corresponding power generation unchanged and adjust the inverter's output power to the fifth value. Since the third or fourth value is less than the fifth value, the subgrid with more power generation and more energy storage devices can output more power, while the subgrid with less energy storage devices can output less power. This can improve the consistency of the SOC of energy storage devices in the combined grid while ensuring that the load receives sufficient power, thereby improving the power output capacity of the combined grid.

[0050] As another possible implementation, when the current power supply is less than the first load power, multiple power generation capacities are different, multiple energy storage devices have the same current SOC, and the energy storage devices in the first subgrid are in a static state, the inverter sends a fifth instruction message to the inverter of each of the multiple subgrids to obtain the adjusted power supply.

[0051] The first subgrid is any one of the multiple subgrids, and the fifth indication message is used to indicate that the output power of the energy storage device is adjusted to the sixth value, and the adjusted power supply is not less than the first load power.

[0052] As an example, the inverter of the main grid determines whether the current power supply is less than the first load power, and obtains the eighth judgment result; the inverter of the main grid determines whether multiple power generation powers are different, and obtains the ninth judgment result; the inverter of the main grid determines whether the current SOC of multiple energy storage devices is the same, and obtains the tenth judgment result; the inverter of the main grid determines whether the state of each energy storage device is a static state, and obtains multiple eleventh judgment results.

[0053] If the eighth judgment result is yes, the ninth judgment result is yes, the tenth judgment result is yes, and each eleventh judgment result is yes, the inverter of the main sub-grid determines the sixth value, generates the fifth indication message, and sends the fifth indication message to the inverter of each sub-grid in the multiple sub-grids.

[0054] Correspondingly, the inverter of each sub-grid receives the fifth instruction message from the inverter of the main sub-grid and adjusts the output power of the energy storage device to the sixth value.

[0055] It should be noted that the specific scheme for determining the sixth value of the inverter in the master and slave power grids in this example can refer to existing schemes, and will not be described in detail here.

[0056] Based on this possible implementation, when the current power supply is less than the first load power, multiple power generation capacities are different, multiple energy storage devices have the same current SOC, and the energy storage devices in the first sub-grid are in a static state, a fifth instruction message is sent to the inverter of each sub-grid in multiple sub-grids to adjust the output power of the energy storage devices to the sixth value. Since the output power of each energy storage device is consistent and the adjusted power supply is not less than the first load power, it is possible to improve the consistency of the SOC of the energy storage devices in the combined grid while ensuring that the load receives sufficient power, thereby improving the power output capacity of the combined grid.

[0057] As another possible implementation, when the current power supply is not less than the first load power, the multiple power generation capacities are different, and the energy storage devices in the first subgrid are in a static state, the inverter sends a sixth instruction message to the inverter of the fourth subgrid, a seventh instruction message to the inverter of the fifth subgrid, and an eighth instruction message to the inverter of the sixth subgrid, and the adjusted power supply is not less than the first load power.

[0058] Among them, the first subgrid is any one of the multiple subgrids; the fourth subgrid is the subgrid whose corresponding power generation is greater than the first value and whose current SOC of the energy storage device is not less than the second value; the fifth subgrid is the subgrid whose corresponding power generation is greater than the first value and whose current SOC of the energy storage device is less than the second value; the sixth subgrid is the subgrid whose corresponding power generation is not greater than the first value and whose current SOC of the energy storage device is less than the second value; the sixth indication message is used to indicate that the corresponding power generation remains unchanged and the inverter output power is adjusted to the seventh value; the seventh indication message is used to indicate that the corresponding power generation remains unchanged and the inverter output power is adjusted to the eighth value; the eighth indication message is used to indicate that the corresponding power generation remains unchanged and the inverter output power is adjusted to the ninth value; the ninth value is less than the eighth value; the eighth value is less than the seventh value; and the adjusted power supply is not less than the first load power.

[0059] As an example, the inverter of the main grid determines whether the current power supply is not less than the first load power, and obtains the twelfth judgment result; the inverter of the main grid determines whether multiple power generation powers are different, and obtains the thirteenth judgment result; the inverter of the main grid determines whether the state of each energy storage device is in a static state, and obtains multiple fourteenth judgment results.

[0060] If the twelfth judgment result is yes, the thirteenth judgment result is yes, and each fourteenth judgment result is yes, the inverter of the main sub-grid determines the sub-grid whose corresponding power generation is greater than the first value and the current SOC of the energy storage device is not less than the second value as the fourth sub-grid, then determines the seventh value, generates the sixth indication message, and sends the sixth indication message to the fourth sub-grid; the inverter of the main sub-grid determines the sub-grid whose corresponding power generation is greater than the first value and the current SOC of the energy storage device is less than the second value as the fifth sub-grid, then determines the eighth value, generates the seventh indication message, and sends the seventh indication message to the fifth sub-grid; the inverter of the main sub-grid determines the sub-grid whose corresponding power generation is not greater than the first value and the current SOC of the energy storage device is less than the second value as the sixth sub-grid, then determines the ninth value, generates the eighth indication message, and sends the eighth indication message to the sixth sub-grid.

[0061] Accordingly, the inverter of the fourth sub-grid receives the sixth indication message from the inverter of the main sub-grid, maintains the corresponding power generation unchanged, and adjusts its own output power to the seventh value; the inverter of the fifth sub-grid receives the seventh indication message from the inverter of the main sub-grid, maintains the corresponding power generation unchanged, and adjusts its own output power to the eighth value; the inverter of the sixth sub-grid receives the eighth indication message from the inverter of the main sub-grid, maintains the corresponding power generation unchanged, and adjusts its own output power to the ninth value. Finally, the adjusted power supply is obtained.

[0062] It should be noted that the specific scheme for determining the seventh, eighth, and ninth values ​​of the inverter in the master and slave power grids in this example can refer to existing schemes, and will not be described in detail here.

[0063] Based on this possible implementation, under the conditions that the current power supply is not less than the first load power, multiple power generation capacities are different, and the energy storage devices in the first subgrid are in a static state, the fourth subgrid is the subgrid among multiple subgrids where the corresponding power generation is greater than the first value and the current SOC of the energy storage devices is not less than the second value, the fifth subgrid is the subgrid among multiple subgrids where the corresponding power generation is greater than the first value and the current SOC of the energy storage devices is less than the second value, and the sixth subgrid is the subgrid among multiple subgrids where the corresponding power generation is not greater than the first value and the current SOC of the energy storage devices is less than the second value. By sending a sixth indication message to the inverter of the fourth subgrid, a seventh indication message to the inverter of the fifth subgrid, and an eighth indication message to the inverter of the sixth subgrid, the adjusted power supply is obtained. The power output is adjusted as follows: the sixth indication message indicates that the corresponding power generation should remain unchanged, and the inverter output power is adjusted to the seventh value; the seventh indication message indicates that the corresponding power generation should remain unchanged, and the inverter output power is adjusted to the eighth value; the eighth indication message indicates that the corresponding power generation should remain unchanged, and the inverter output power is adjusted to the ninth value. The ninth value is less than the eighth value, and the eighth value is less than the seventh value. The adjusted power supply is not less than the first load power. This allows subgrids with higher power generation and more energy storage devices to output more power, while subgrids with lower power generation or less energy storage devices to output less power. This ensures that the load receives sufficient power while improving the consistency of the SOC of energy storage devices in the combined grid, thereby enhancing the power output capacity of the combined grid.

[0064] As another possible implementation, when the current power supply is not less than the first load power and the SOC of multiple energy storage devices is the same, the inverter obtains the ninth indication message, and then sends the tenth indication message to each of the multiple sub-grids to obtain the adjusted power supply.

[0065] Among them, the ninth indication message is used to indicate that the power of the load is adjusted from the first load power to the second load power, and the tenth indication message is used to indicate that the corresponding power generation is kept unchanged, and the output power of the energy storage device is adjusted to the tenth value, and the adjusted power supply is not less than the first load power.

[0066] It should be noted that for a detailed description of the possible implementation, please refer to the relevant description in the following sections of the specific implementation method of this application, which will not be repeated here.

[0067] Based on this scheme, the current power supply of the combined power grid to the load, the first load power of the load, and the first information of each sub-grid in the combined power grid are obtained. These sub-grids include multiple slave sub-grids and a master sub-grid. The first information includes the status of the energy storage devices, the state of charge (SOC) of the energy storage devices, and the power generation capacity of the generators. The status information includes charging status or idle status. Subsequently, multiple inverters can be controlled based on the current power supply, the first load power, and the multiple pieces of first information to ensure that the SOC of the multiple energy storage devices is the same, thereby improving the consistency of the SOC of the energy storage devices in the combined power grid and enhancing the power output capacity of the combined power grid.

[0068] The above is a general description of the equipment control method provided in this application. The following will provide a further description of the equipment control method provided in this application in conjunction with the accompanying drawings.

[0069] In one design, where the current power supply is not less than the first load power and the SOC of multiple energy storage devices is the same, Figure 3 is a flowchart illustrating another device control method provided in this application. As shown in Figure 3, S202 provided in the specific embodiment of this application may include the following steps:

[0070] S301, Inverter receives the ninth instruction message.

[0071] The ninth indication message is used to indicate that the load power is adjusted from the first load power to the second load power.

[0072] It should be noted that the power of the first load can be greater than the power of the second load, or the power of the first load can be less than the power of the second load; this application does not impose any specific restrictions on this.

[0073] As one possible implementation, referring to Figure 1, after the load power is adjusted from the first load power to the second load power, the load power detection device generates a ninth indication message and sends the ninth indication message to the inverter of the main grid. The inverter of the main grid receives the ninth indication message.

[0074] S302, the inverter sends the tenth instruction message to the inverter of each of the multiple sub-grids to obtain the adjusted power supply.

[0075] The tenth instruction message is used to indicate that the corresponding power generation power should remain unchanged, and the output power of the energy storage device should be adjusted to the tenth value. The adjusted power supply power should not be less than the first load power.

[0076] As one possible implementation, the inverter of the main subgrid determines the tenth value, generates a tenth indication message, and sends the tenth indication message to the inverter of each subgrid in the multiple subgrids.

[0077] Correspondingly, the inverter of each sub-grid receives the tenth instruction message from the inverter of the main sub-grid, adjusts the output power of the energy storage device to the tenth value, and obtains the adjusted power supply.

[0078] It should be noted that the specific scheme for determining the tenth value of the inverter of the master and slave power grids in this example can refer to existing schemes, and will not be described in detail here.

[0079] Based on this scheme, under the condition that the current power supply is not less than the first load power and the SOC of multiple energy storage devices is the same, a ninth indication message is obtained to indicate that the load power is adjusted from the first load power to the second load power. By sending a tenth indication message to the inverter of each sub-grid in multiple sub-grids, the adjusted power supply is obtained. Since the tenth indication message is used to indicate that the corresponding power generation is kept unchanged and the output power of the energy storage device is adjusted to the tenth value, the adjusted power supply is not less than the first load power. Therefore, when the load power changes, it can improve the consistency of the SOC of energy storage devices in the combined grid while ensuring that the load receives sufficient power, thereby improving the power output capacity of the combined grid.

[0080] In one design, Figure 4 is a flowchart illustrating another device control method provided in this application. As shown in Figure 4, the device control method provided in this application may further include the following steps:

[0081] S401, The inverter detected an abnormality in the inverter of the main grid.

[0082] As one possible implementation, if an inverter in the main grid malfunctions, the inverter in the subgrid can detect that it has malfunctioned.

[0083] S402, The inverter sends an eleventh instruction message to the inverter of each of the multiple slave subgrids.

[0084] Among them, the eleventh instruction message is used to instruct the inverters of multiple slave subgrids to determine a new master subgrid based on preset rules. The new master subgrid is any one of the multiple slave subgrids.

[0085] It should be noted that the preset rule can be determined randomly, or it can be determined based on the inverter's number size. This application does not impose any specific restrictions on this.

[0086] As one possible implementation, the inverter of the master subgrid generates an eleventh indication message and sends the eleventh indication message to the inverter of each of the multiple slave subgrids.

[0087] Correspondingly, each inverter of the slave subgrid receives the eleventh instruction message from the inverter of the master subgrid. Subsequently, multiple inverters of the slave subgrid determine a new master subgrid based on preset rules. The inverters of the new master subgrid can execute the schemes of S201-S202 provided in the specific implementation of this application.

[0088] Based on this scheme, when an inverter in the master subgrid is detected to be abnormal, an eleventh indication message is sent to the inverter in each of the multiple slave subgrids. Since the eleventh indication message is used to instruct the inverters of the multiple slave subgrids to determine a new master subgrid based on preset rules, and the new master subgrid is any one of the multiple slave subgrids, a new master subgrid can be determined when the inverter in the current master subgrid is abnormal, thereby improving the robustness of the scheme.

[0089] The embodiments of this application can divide the inverter into functional modules according to the above method examples.

[0090] Figure 5 shows a schematic diagram of an inverter structure using functional module division. As shown in Figure 5, the inverter 50 includes an acquisition module 501 and a processing module 502.

[0091] In some embodiments, the inverter 50 may further include a storage module (not shown in FIG5) for storing program instructions and data.

[0092] The acquisition module 501 is used to acquire the current power supply of the combined power grid to the load, the first load power of the load, and the first information of each sub-grid in the multiple sub-grids of the combined power grid; the multiple sub-grids include multiple slave sub-grids and master sub-grids, and the first information includes the status of the energy storage device, the SOC of the energy storage device and the power generation of the generator, and the status information includes charging status or idle status; the processing module 502 is used to control multiple inverters according to the current power supply, the first load power and the multiple first information to make the SOC of the multiple energy storage devices the same.

[0093] Optionally, the processing module 502 is used to control multiple inverters based on the current power supply, the first load power, and multiple first information, including: when the current power supply is not less than the first load power, multiple power generation capacities are the same, and the energy storage device in the first subgrid is in a charging state, sending a first indication message to the inverter of each subgrid in the multiple subgrids to obtain the adjusted power supply; the first subgrid is any one of the multiple subgrids, the first indication message is used to indicate that the energy storage device of the subgrid is fully charged, and the adjusted power supply is not less than the first load power.

[0094] Optionally, the processing module 502 is used to control multiple inverters based on the current power supply, the first load power, and multiple first pieces of information, including: when the current power supply is less than the first load power, the multiple power generation capacities are different, the current SOC of multiple energy storage devices is different, and the energy storage devices in the first sub-grid are in a static state, sending a second indication message to the inverter of the second sub-grid, a third indication message to the inverter of the third sub-grid, and a fourth indication message to the inverter of the fourth sub-grid to obtain the adjusted power supply; the first sub-grid is any one of the multiple sub-grids, and the second sub-grid is the sub-grid whose corresponding power generation capacity is greater than the first value. The power grid is divided into several subgrids. The third subgrid is a subgrid in which the current SOC of the energy storage device is less than the second value. The fourth subgrid is a subgrid in which the corresponding power generation is greater than the first value and the current SOC of the energy storage device is not less than the second value. The second indication message is used to indicate that the corresponding power generation is kept unchanged and the output power of the energy storage device is adjusted to the third value. The third indication message is used to indicate that the corresponding power generation is kept unchanged and the output power of the inverter is adjusted to the fourth value. The fourth indication message is used to indicate that the corresponding power generation is kept unchanged and the output power of the inverter is adjusted to the fifth value. If the third or fourth value is less than the fifth value, the adjusted power supply is not less than the first load power.

[0095] Optionally, the processing module 502 is used to control multiple inverters based on the current power supply, the first load power, and multiple first information, including: when the current power supply is less than the first load power, the multiple power generation capacities are different, the current SOC of multiple energy storage devices is the same, and the energy storage devices in the first subgrid are in a static state, sending a fifth indication message to the inverter of each of the multiple subgrids to obtain the adjusted power supply; the first subgrid is any one of the multiple subgrids, and the fifth indication message is used to indicate that the output power of the energy storage devices be adjusted to a sixth value, and the adjusted power supply is not less than the first load power.

[0096] Optionally, the processing module 502 is used to control multiple inverters based on the current power supply, the first load power, and multiple first pieces of information, including: when the current power supply is not less than the first load power, the multiple power generation capacities are different, and the energy storage device in the first sub-grid is in a static state, sending a sixth indication message to the inverter in the fourth sub-grid, a seventh indication message to the inverter in the fifth sub-grid, and an eighth indication message to the inverter in the sixth sub-grid, wherein the adjusted power supply is not less than the first load power; the first sub-grid is any one of the multiple sub-grids, and the fourth sub-grid is the sub-grid in which the corresponding power generation capacity is greater than a first value and the current SOC of the energy storage device is not less than a second value. The fifth subgrid is a subgrid among multiple grids whose corresponding power generation is greater than the first value and whose current SOC of the energy storage device is less than the second value. The sixth subgrid is a subgrid among multiple subgrids whose corresponding power generation is not greater than the first value and whose current SOC of the energy storage device is less than the second value. The sixth indication message is used to indicate that the corresponding power generation should remain unchanged and the inverter output power should be adjusted to the seventh value. The seventh indication message is used to indicate that the corresponding power generation should remain unchanged and the inverter output power should be adjusted to the eighth value. The eighth indication message is used to indicate that the corresponding power generation should remain unchanged and the inverter output power should be adjusted to the ninth value. The ninth value is less than the eighth value, the eighth value is less than the seventh value, and the adjusted power supply is not less than the first load power.

[0097] Optionally, the processing module 502 is used to control multiple inverters based on the current power supply, the first load power, and multiple first information, including: obtaining a ninth indication message when the current power supply is not less than the first load power and the SOC of multiple energy storage devices is the same; the ninth indication message is used to indicate that the load power is adjusted from the first load power to the second load power; sending a tenth indication message to the inverter of each sub-grid in the multiple sub-grids to obtain the adjusted power supply; the tenth indication message is used to indicate that the corresponding power generation is kept unchanged, and the output power of the energy storage device is adjusted to the tenth value, and the adjusted power supply is not less than the first load power.

[0098] Optionally, the processing module 502 is further configured to: detect an abnormality in the inverter of the master sub-grid; send an eleventh indication message to the inverter of each of the multiple slave sub-grids; the eleventh indication message is used to instruct the inverters of the multiple slave sub-grids to determine a new master sub-grid based on preset rules, wherein the new master sub-grid is any one of the multiple slave sub-grids.

[0099] All relevant content of each step involved in the above method embodiments can be referenced from the functional description of the corresponding functional module, and will not be repeated here.

[0100] Figure 6 shows a schematic diagram of another inverter structure when the functions of the above-mentioned modules are implemented in hardware. As shown in Figure 6, the inverter 60 includes a processor 601, a memory 602, and a bus 603. The processor 601 and the memory 602 can be connected via the bus 603.

[0101] As one embodiment, processor 601 may include one or more CPUs, such as CPU 0 and CPU 1 shown in FIG. 6.

[0102] In one possible implementation, the memory 602 can exist independently of the processor 601. The memory 602 can be connected to the processor 601 via a bus 603 and is used to store instructions or program code. When the processor 601 calls and executes the instructions or program code stored in the memory 602, it can implement the device control method provided in the embodiments of this application.

[0103] In another possible implementation, the memory 602 can also be integrated with the processor 601.

[0104] It should be noted that the structure shown in Figure 6 does not constitute a limitation on the inverter 60. In addition to the components shown in Figure 6, the inverter 60 may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0105] As an example, referring to Figure 5, the functions implemented by the acquisition module 501 and processing module 502 in inverter 50 are the same as those implemented by processor 601 in Figure 6.

[0106] Optionally, as shown in FIG6, the inverter 60 provided in this embodiment may further include a communication interface 604.

[0107] In one possible implementation, the communication interface 604 in the inverter 60 provided in this application embodiment can also be integrated into the processor 601, and this application embodiment does not specifically limit this.

[0108] This application also provides a computer-readable storage medium storing a computer program or instructions thereon, which, when executed, causes a computer to perform the various steps in the method flow shown in the above method embodiments.

[0109] Embodiments of this application provide a computer program product containing instructions that, when executed on a computer, cause the computer to perform the various steps in the method flow shown in the above-described method embodiments.

[0110] This application provides a chip system, including: a processor and an interface circuit; the interface circuit is used to receive computer programs or instructions and transmit them to the processor; the processor is used to execute the computer programs or instructions so that the chip system performs each step in the method flow shown in the above method embodiments.

[0111] Since the inverter, computer-readable storage medium, and computer program product provided in this embodiment can be applied to the device control method provided in this embodiment, the technical effects that can be obtained can also be referred to the above method embodiments. The embodiments of this application will not be repeated here.

Claims

1. A device control method, characterized in that, The method is applied to an inverter in a master-slave grid of a combined power grid, which further includes multiple slave grids, each slave grid including energy storage and power generation equipment. The combined power grid is used to supply power to loads, and the method includes: The system acquires the current power supply of the combined power grid to the load, the first load power of the load, and the first information of each sub-grid in the multiple sub-grids of the combined power grid; the multiple sub-grids include the multiple slave sub-grids and the master sub-grid, and the first information includes the status of the energy storage device, the current state of charge (SOC) of the energy storage device, and the power generation of the power generation device, and the status information includes charging status or idle status; Multiple inverters are controlled based on the current power supply, the first load power, and multiple first information to make the SOC of multiple energy storage devices the same.

2. The method according to claim 1, characterized in that, The step of controlling multiple inverters based on the current power supply, the first load power, and multiple first pieces of information includes: When the current power supply is not less than the first load power, multiple power generation capacities are the same, and the energy storage device in the first subgrid is in a charging state, a first indication message is sent to the inverter of each of the multiple subgrids to obtain the adjusted power supply; the first subgrid is any one of the multiple subgrids, and the first indication message is used to indicate that the energy storage device of the subgrid is fully charged, and the adjusted power supply is not less than the first load power.

3. The method according to claim 1, characterized in that, The step of controlling multiple inverters based on the current power supply, the first load power, and multiple first pieces of information includes: When the current power supply is less than the first load power, multiple power generation capacities are different, multiple energy storage devices have different current SOCs, and the energy storage devices in the first subgrid are in a static state, a second indication message is sent to the inverter of the second subgrid, a third indication message is sent to the inverter of the third subgrid, and a fourth indication message is sent to the inverter of the fourth subgrid to obtain the adjusted power supply; the first subgrid is any one of the multiple subgrids, the second subgrid is the subgrid whose corresponding power generation capacity is greater than the first value, and the third subgrid is the subgrid whose current SOC of the energy storage devices is less than the first value. For the subgrid with the second value, the fourth subgrid is the subgrid in the plurality of subgrids whose corresponding power generation is greater than the first value and whose current SOC of the energy storage device is not less than the second value. The second indication message is used to indicate that the corresponding power generation is kept unchanged and the output power of the energy storage device is adjusted to the third value. The third indication message is used to indicate that the corresponding power generation is kept unchanged and the output power of the inverter is adjusted to the fourth value. The fourth indication message is used to indicate that the corresponding power generation is kept unchanged and the output power of the inverter is adjusted to the fifth value. The third value or the fourth value is less than the fifth value, and the adjusted power supply is not less than the first load power.

4. The method according to claim 1, characterized in that, The step of controlling multiple inverters based on the current power supply, the first load power, and multiple first pieces of information includes: When the current power supply is less than the first load power, multiple power generation capacities are different, multiple energy storage devices have the same current SOC, and the energy storage devices in the first subgrid are in a quiescent state, a fifth indication message is sent to the inverter of each of the multiple subgrids to obtain the adjusted power supply; the first subgrid is any one of the multiple subgrids, and the fifth indication message is used to indicate that the output power of the energy storage device is adjusted to a sixth value, and the adjusted power supply is not less than the first load power.

5. The method according to claim 1, characterized in that, The step of controlling multiple inverters based on the current power supply, the first load power, and multiple first pieces of information includes: When the current power supply is not less than the first load power, the multiple power generation capacities are different, and the energy storage device in the first subgrid is in a static state, a sixth indication message is sent to the inverter of the fourth subgrid, a seventh indication message is sent to the inverter of the fifth subgrid, and an eighth indication message is sent to the inverter of the sixth subgrid. The adjusted power supply is not less than the first load power. The first subgrid is any one of the multiple subgrids, the fourth subgrid is the subgrid in which the corresponding power generation is greater than the first value and the current SOC of the energy storage device is not less than the second value, and the fifth subgrid is the subgrid in which the corresponding power generation is greater than the first value. The sixth subgrid is a subgrid whose current SOC of the energy storage device is less than the second value. The sixth subgrid is a subgrid in the plurality of subgrids whose corresponding power generation is not greater than the first value and whose current SOC of the energy storage device is less than the second value. The sixth indication message is used to indicate that the corresponding power generation is kept unchanged and the output power of the inverter is adjusted to the seventh value. The seventh indication message is used to indicate that the corresponding power generation is kept unchanged and the output power of the inverter is adjusted to the eighth value. The eighth indication message is used to indicate that the corresponding power generation is kept unchanged and the output power of the inverter is adjusted to the ninth value. The ninth value is less than the eighth value. The eighth value is less than the seventh value. The adjusted power supply is not less than the first load power.

6. The method according to claim 1, characterized in that, The step of controlling multiple inverters based on the current power supply, the first load power, and multiple first pieces of information includes: When the current power supply is not less than the first load power and the SOC of multiple energy storage devices is the same, a ninth indication message is obtained; the ninth indication message is used to indicate that the power of the load is adjusted from the first load power to the second load power. A tenth indication message is sent to the inverter of each of the plurality of sub-grids to obtain the adjusted power supply; the tenth indication message is used to indicate that the corresponding power generation is kept unchanged, and the output power of the energy storage device is adjusted to the tenth value, and the adjusted power supply is not less than the first load power.

7. The method according to any one of claims 1-6, characterized in that, The method further includes: An anomaly was detected in the inverter of the main power grid; An eleventh indication message is sent to the inverter of each of the plurality of slave sub-grids; the eleventh indication message is used to instruct the inverters of the plurality of slave sub-grids to determine a new master sub-grid based on a preset rule, wherein the new master sub-grid is any one of the plurality of slave sub-grids.

8. An inverter, characterized in that, The inverter is included in the master sub-grid in the combined grid, the combined grid also includes multiple slave sub-grids, the sub-grids also include energy storage devices and power generation devices, the combined grid is used to supply power to the load, and the inverter includes: an acquisition module and a processing module; The acquisition module is used to acquire the current power supply of the combined power grid to the load, the first load power of the load, and the first information of each sub-grid in the multiple sub-grids of the combined power grid; the multiple sub-grids include the multiple slave sub-grids and the master sub-grid, and the first information includes the status of the energy storage device, the current state of charge (SOC) of the energy storage device, and the power generation of the power generation device, and the status information includes charging status or idle status; The processing module is used to control multiple inverters based on the current power supply, the first load power, and multiple first information, so that the SOC of multiple energy storage devices is the same.

9. An inverter, characterized in that, The inverter includes a processor coupled to a memory for storing programs or instructions that, when executed by the processor, cause the inverter to perform the method as described in any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program or instructions stored thereon, characterized in that, When the computer program or instructions are executed, they cause the computer to perform the method as described in any one of claims 1 to 7.

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