Inverter control methods, devices, equipment and media

Abstract

This application relates to the field of photovoltaic power generation technology, specifically providing an inverter control method, device, equipment, and medium. The aim is to solve the technical problem that excess electrical energy from photovoltaic modules, after passing through the DC bus, causes a voltage increase on the DC bus, leading to a voltage increase across the DC load and consequently preventing the DC load from operating normally. To this end, the photovoltaic power curtailment detection method includes: acquiring the DC bus voltage, the AC load power, and the curtailed power of the photovoltaic modules; determining whether the DC bus voltage is within a preset voltage range; if the DC bus voltage is determined to be within the preset voltage range, obtaining the inverter output power for the current operating cycle based on the curtailed power of the photovoltaic modules; determining the inverter's operating mode based on the relationship between the AC load power and the inverter's output power for the current operating cycle; and determining the inverter's output power for the next operating cycle based on the operating mode.

Description

Technical Field

[0001] This application relates to the field of photovoltaic power generation technology, specifically providing an inverter control method, device, equipment, and medium. Background Technology

[0002] Photovoltaic modules can convert solar energy into direct current (DC), and can also convert DC into alternating current (AC) through an inverter, thereby supplying power to electrical appliances.

[0003] In a photovoltaic and energy storage parallel application system, there are inverters, photovoltaic modules, energy storage batteries, DC-DC converters, energy managers, DC loads, AC loads, and a DC bus. The inverters and DC loads are connected to the DC bus, and the inverters and AC loads are connected. After passing through the DC-DC converter, the photovoltaic modules and energy storage batteries gather stable DC power onto the DC bus for use by the DC loads. The DC power can also be converted into AC power by the inverter for use by the AC loads.

[0004] In practical applications, when the power generation of photovoltaic (PV) modules exceeds the DC load power and the energy storage battery's absorption capacity, the DC-DC converter operates in power-limiting mode, resulting in a portion of the electrical energy generated by the PV modules being wasted. Current technology typically converts the DC-DC converter to maximum power point tracking (MPPT) mode, then the excess energy generated by the PV modules is absorbed by the AC load via an inverter. While this method can improve the utilization rate of PV capacity, the excess energy passing through the DC bus causes a voltage increase, leading to a voltage rise across the DC load and ultimately preventing the DC load from operating normally.

[0005] Accordingly, there is a need in the field for a new inverter control method to solve the above problems. Summary of the Invention

[0006] In order to overcome the above-mentioned defects, this application is made to provide a solution or at least a partial solution to the technical problem in the prior art where excess electrical energy generated by photovoltaic modules passes through the DC bus, causing the voltage of the DC bus to rise, which in turn causes the voltage across the DC load to rise, resulting in the DC load being unable to operate normally.

[0007] In a first aspect, this application provides an inverter control method, comprising:

[0008] Obtain the DC bus voltage, AC load power, and curtailed power of photovoltaic modules;

[0009] Determine whether the voltage of the DC bus is within the preset voltage range;

[0010] If it is determined that the voltage of the DC bus is within the preset voltage range, the output power of the inverter for the current operating cycle is obtained based on the curtailment power of the photovoltaic module.

[0011] The inverter's operating mode is determined based on the relationship between the power of the AC load and the output power of the inverter in the current operating cycle.

[0012] Based on the operating mode, the inverter's output power for the next operating cycle is determined.

[0013] In one technical solution of the above-mentioned inverter control method, determining the inverter's operating mode based on the relationship between the AC load power and the inverter's output power in the current operating cycle includes:

[0014] Determine whether the power of the AC load is greater than or equal to the output power of the inverter in the current operating cycle;

[0015] If it is determined that the power of the AC load is greater than or equal to the output power of the inverter, then the operating mode is determined to be operating mode 1;

[0016] The step of determining the inverter's output power for the next operating cycle according to the operating mode includes: using the inverter's output power for the current cycle as the inverter's output power for the next operating cycle according to the operating mode 1.

[0017] In one technical solution of the above-mentioned inverter control method, the method further includes determining the inverter's operating mode based on the relationship between the AC load power and the inverter's output power in the current operating cycle:

[0018] Determine whether the power of the AC load is greater than or equal to the output power of the inverter in the current operating cycle;

[0019] If it is determined that the power of the AC load is less than the output power of the inverter, then the operating mode is determined to be operating mode 2;

[0020] The step of determining the inverter's output power for the next operating cycle based on the operating mode includes:

[0021] Based on the operating mode 2, the inverter output power for the next operating cycle is obtained according to the preset minimum power of the power grid and the power of the AC load.

[0022] In one technical solution of the above-mentioned inverter control method, obtaining the inverter's output power for the next operating cycle based on the preset minimum grid power and the power of the AC load includes:

[0023] The difference between the preset grid power and the AC load power is used to obtain the difference power.

[0024] The difference in power is used as the output power of the inverter in the next operating cycle.

[0025] In one technical solution of the above-mentioned inverter control method, the method further includes:

[0026] Obtain the grid voltage;

[0027] The inverter current for the next operating cycle is obtained based on the inverter's output power and the grid voltage for the next operating cycle.

[0028] The inverter is adjusted according to the inverter current in the next operating cycle.

[0029] In one technical solution of the above-mentioned inverter control method, the step of adjusting the inverter according to the inverter current in the next operating cycle includes:

[0030] The modulation signal is obtained based on the inverter current in the next operating cycle;

[0031] The inverter is regulated according to the modulation signal.

[0032] In one technical solution of the above-mentioned inverter control method, the method further includes:

[0033] If it is determined that the voltage of the DC bus is not within the preset voltage range, the inverter will be put into standby mode.

[0034] Secondly, this application provides an inverter device, comprising:

[0035] The acquisition module is used to acquire the voltage of the DC bus, the power of the AC load, and the curtailed power of the photovoltaic modules;

[0036] The judgment module is used to determine whether the voltage of the DC bus is within a preset voltage range;

[0037] The determination module is used to determine the output power of the inverter for the current operating cycle based on the curtailment power of the photovoltaic module if the voltage of the DC bus is determined to be within a preset voltage range.

[0038] The analysis module is used to determine the operating mode of the inverter based on the relationship between the power of the AC load and the output power of the inverter in the current operating cycle.

[0039] The processing module is used to determine the inverter's output power for the next operating cycle based on the operating mode.

[0040] Thirdly, this application provides an inverter, including at least one processor and a memory; wherein,

[0041] The memory stores computer-executed instructions;

[0042] The at least one processor executes computer execution instructions stored in the memory, causing the at least one processor to perform the method described in any one of the first aspects.

[0043] In a second aspect, this application provides a computer-readable storage medium storing a plurality of program codes adapted to be loaded and run by a processor to perform the method described in any one of the first aspects.

[0044] This application provides an inverter control method, apparatus, device, and medium. The method specifically comprises: acquiring the voltage of the DC bus, the power of the AC load, and the curtailed power of the photovoltaic module; determining whether the voltage of the DC bus is within a preset voltage range; if the voltage of the DC bus is within the preset voltage range, obtaining the output power of the inverter for the current operating cycle based on the curtailed power of the photovoltaic module; determining the inverter's operating mode based on the relationship between the power of the AC load and the output power of the inverter for the current operating cycle; and determining the output power of the inverter for the next operating cycle based on the operating mode, thereby achieving effective utilization of the curtailed power while ensuring the normal operation of the DC load. Attached Figure Description

[0045] The disclosure of this application will become more readily understood with reference to the accompanying drawings. It will be readily understood by those skilled in the art that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this application. Furthermore, similar numbers in the drawings are used to denote similar components, wherein:

[0046] Figure 1 This is a schematic diagram of a photovoltaic and energy storage parallel system provided in an embodiment of this application;

[0047] Figure 2 This is a flowchart illustrating an embodiment of an inverter control method provided in this application.

[0048] Figure 3 This is a flowchart illustrating a second embodiment of an inverter control method provided in this application.

[0049] Figure 4 This is a flowchart illustrating a third embodiment of an inverter control method provided in this application.

[0050] Figure 5 This is a flowchart illustrating a fourth embodiment of an inverter control method provided in this application.

[0051] Figure 6 This is a flowchart illustrating a fifth embodiment of an inverter control method provided in this application.

[0052] Figure 7 This is a flowchart illustrating a sixth embodiment of an inverter control method provided in this application.

[0053] Figure 8 This is a flowchart illustrating a seventh embodiment of an inverter control method provided in this application.

[0054] Figure 9 This is a flowchart illustrating an eighth embodiment of an inverter control method provided in this application.

[0055] Figure 10 This is a schematic diagram of the structure of an inverter device provided in an embodiment of this application;

[0056] Figure 11 This is a schematic diagram of the structure of an inverter provided in an embodiment of this application.

[0057] List of reference numerals :

[0058] 11: Photovoltaic module; 12: Energy storage battery; 13: DC-DC conversion module; 14: DC bus; 15: Energy manager; 16: DC load; 17: Inverter; 18: AC load; 21: Acquisition module; 22: Judgment module; 23: Determination module; 24: Analysis module; 25: Processing module; 31: Processor; 32: Memory. Detailed Implementation

[0059] Some embodiments of this application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of this application and are not intended to limit the scope of protection of this application.

[0060] In the description of this application, "module" and "processor" can include hardware, software, or a combination of both. A module can include hardware circuitry, various suitable sensors, communication ports, memory, and can also include software components, such as program code, or a combination of software and hardware. A processor can be a central processing unit, microprocessor, image processor, digital signal processor, or any other suitable processor. The processor has data and / or signal processing capabilities. The processor can be implemented in software, in hardware, or a combination of both. Non-transitory computer-readable storage media includes any suitable medium capable of storing program code, such as magnetic disks, hard disks, optical disks, flash memory, read-only memory, random access memory, etc. The term "A and / or B" means all possible combinations of A and B, such as only A, only B, or A and B. The terms "at least one A or B" or "at least one of A and B" have a similar meaning to "A and / or B" and can include only A, only B, or A and B. The singular terms "a" or "this" can also include plural forms.

[0061] Currently, when photovoltaic modules are in maximum power point tracking mode, if the power generated by the photovoltaic modules is greater than the power of the DC load, the curtailed power generated by the photovoltaic modules will be transmitted to the AC load through the bus to make full use of solar energy. However, when the curtailed power is transmitted to the bus, the bus voltage increases, and the voltage across the DC load also increases, which leads to the technical problem of damage to the DC load.

[0062] Based on this, in order to solve the above-mentioned technical problems, the technical concept of this application is to provide a new inverter control method to ensure the safe operation of DC load while absorbing excessive photovoltaic power.

[0063] Figure 1 This is a schematic diagram of a photovoltaic and energy storage parallel system provided in an embodiment of this application. Figure 1As shown, the photovoltaic and energy storage system includes: multiple photovoltaic modules 11, multiple energy storage batteries 12, multiple DC-DC conversion modules 13, a DC bus 14, an energy manager 15, a DC load 16, an inverter 17, and an AC load 18. The energy manager 14 acquires the total power of the multiple photovoltaic modules 11 and multiple energy storage batteries 12. When the total power is greater than the rated power of the DC load, it sends a start-up command to the inverter 17. After receiving the start-up command, the inverter 17 starts up and acquires the voltage of the DC bus, the power of the AC load, and the curtailed power of the photovoltaic modules. Then, it determines whether the voltage of the DC bus is within the preset voltage range. If it is determined that the power of the DC bus is within the preset voltage range, the output power of the inverter for the current operating cycle is obtained based on the curtailed power of the photovoltaic modules. Then, based on the relationship between the power of the AC load and the output power of the inverter for the current operating cycle, the operating mode of the inverter is determined. Finally, based on the operating mode, the output power of the inverter for the next operating cycle is determined.

[0064] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0065] Figure 2 This is a flowchart illustrating an embodiment of an inverter control method provided in this application. Figure 2 As shown, specifically, the method includes:

[0066] Step S201: Obtain the voltage of the DC bus, the power of the AC load, and the curtailment power of the photovoltaic modules.

[0067] In this embodiment, for example, the voltage across the DC bus and the power of the AC load are measured using a multimeter.

[0068] In this embodiment, the curtailed power of the photovoltaic module is obtained from the DC-DC conversion module.

[0069] Step S202: Determine whether the voltage of the DC bus is within the preset voltage range.

[0070] In this embodiment, when the DC-DC conversion module is operating in maximum power point tracking mode, the voltage on the DC bus increases. At this time, it is necessary to determine whether the voltage on the DC bus is within the preset voltage range, which is the normal operating voltage range of the DC load.

[0071] Step S203: If it is determined that the voltage of the DC bus is within the preset voltage range, the output power of the inverter for the current operating cycle is obtained based on the curtailment power of the photovoltaic modules.

[0072] In this embodiment, when the voltage of the DC bus is determined to be within the preset voltage range, the curtailment power of the photovoltaic module is the output power of the inverter in the current operating cycle, and then the output power of the inverter is used as the actual power of the AC load.

[0073] In this embodiment, the inverter converts DC power to AC power at a certain frequency during operation, and the reciprocal of the frequency is taken as one operating cycle of the inverter.

[0074] Step S204: Determine the inverter's operating mode based on the relationship between the power of the AC load and the output power of the inverter in the current operating cycle.

[0075] In this embodiment, the inverter has multiple operating modes. The inverter needs to determine the operating mode based on the relationship between the power of the AC load and the output power of the inverter in the current operating cycle.

[0076] Step S205: Determine the inverter's output power for the next operating cycle based on the operating mode.

[0077] In this embodiment, the inverter's output power for the next cycle is obtained based on the operating mode, and the inverter operates according to this output power in the next cycle.

[0078] In this embodiment, the voltage of the DC bus, the power of the AC load, and the curtailed power of the photovoltaic modules are obtained; it is determined whether the voltage of the DC bus is within a preset voltage range; if the voltage of the DC bus is within the preset voltage range, the output power of the inverter for the current operating cycle is obtained based on the curtailed power of the photovoltaic modules; the operating mode of the inverter is determined based on the relationship between the power of the AC load and the output power of the inverter for the current operating cycle; and the output power of the inverter for the next operating cycle is determined based on the operating mode. Compared to the prior art, where excess electrical energy generated by the photovoltaic modules is absorbed by the AC load after passing through the inverter, thus leading to a decrease in the power consumption at both ends of the DC load, this method achieves a more efficient and efficient operation. This application addresses the technical problem of voltage rise leading to DC load malfunction. First, it obtains the DC bus voltage, AC load power, and curtailed photovoltaic (PV) power. Then, it determines whether the DC bus voltage is within a preset voltage range. If within the preset range, it obtains the inverter output power for the current operating cycle based on the PV power curtailed. Finally, it determines the inverter's operating mode based on the relationship between the AC load power and the inverter's output power for the current operating cycle. Based on the operating mode, it determines the inverter's output power for the next operating cycle, thereby effectively utilizing the curtailed power while ensuring the normal operation of the DC load.

[0079] Figure 3This is a flowchart illustrating a second embodiment of an inverter control method provided in this application. Based on the above embodiments, as follows... Figure 3 As shown, one specific implementation of step S204 is as follows:

[0080] Step S301: Determine whether the power of the AC load is greater than or equal to the output power of the inverter in the current operating cycle.

[0081] Step S302: If it is determined that the power of the AC load is greater than or equal to the output power of the inverter, then the operating mode is determined to be operating mode 1.

[0082] In this embodiment, if the power of the AC load is greater than or equal to the output power of the inverter, it is determined that the output power of the inverter does not exceed the power of the AC load, and the inverter operates in working mode 1.

[0083] One specific implementation of step S205 is as follows:

[0084] Step S303: According to operating mode 1, the output power of the inverter in the current cycle is used as the output power of the inverter in the next operating cycle.

[0085] In this embodiment, in operating mode 1, when it is determined that the power of the AC load is greater than or equal to the output power of the inverter, the output power of the inverter in the current cycle is used as the output power of the inverter in the next operating cycle.

[0086] In this embodiment, it is determined whether the power of the AC load is greater than or equal to the output power of the inverter in the current operating cycle. If it is determined that the power of the AC load is greater than or equal to the output power of the inverter, the operating mode is determined to be operating mode 1. According to operating mode 1, the output power of the inverter in the current cycle is used as the output power of the inverter in the next operating cycle to ensure the continuous operation of the inverter.

[0087] Figure 4 This is a flowchart illustrating a third embodiment of an inverter control method provided in this application. Based on the above embodiments, as follows... Figure 4 As shown, another specific implementation of step S204 is as follows:

[0088] Step S401: Determine whether the power of the AC load is greater than or equal to the output power of the inverter in the current operating cycle.

[0089] In this embodiment, the operating mode of the inverter is determined by judging the relationship between the power of the AC load and the output power of the inverter in the current operating cycle.

[0090] Step S402: If it is determined that the power of the AC load is less than the output power of the inverter, then the operating mode is determined to be operating mode 2.

[0091] In this embodiment, if the power of the AC load is less than the output power of the inverter, the inverter operates in operating mode 2.

[0092] One specific implementation of step S205 is as follows:

[0093] Step S403: Based on operating mode 2, and according to the preset minimum power of the power grid and the power of the AC load, obtain the output power of the inverter for the next operating cycle.

[0094] In this embodiment, the AC load is powered by both the power grid and photovoltaic power. The sum of the power supplied by the power grid to the AC load and the output power of the inverter is the power of the AC load. Therefore, in operating mode 2, the output power of the inverter for the next operating cycle is obtained based on the preset minimum power of the power grid and the power of the AC load.

[0095] In this embodiment, it is determined whether the power of the AC load is greater than or equal to the output power of the inverter in the current operating cycle. If it is determined that the power of the AC load is less than the output power of the inverter, the operating mode is determined to be operating mode 2. According to operating mode 2, the output power of the inverter in the next operating cycle is obtained based on the preset minimum power of the grid and the power of the AC load, thereby ensuring the continuous and stable operation of the inverter.

[0096] Figure 5 This is a flowchart illustrating a fourth embodiment of an inverter control method provided in this application. Based on the above embodiments, as... Figure 5 As shown, one specific implementation of step S403 is as follows:

[0097] Step S501: Subtract the preset grid power from the AC load power to obtain the difference power.

[0098] In this embodiment, the power difference is obtained by subtracting the preset grid power from the power of the AC load. Alternatively, the power of the AC load can be obtained by adding the grid output power to the inverter output power.

[0099] In this embodiment, the preset grid power is a value greater than 0 to ensure that photovoltaic power does not flow into the grid.

[0100] Step S502: Use the differential power as the output power of the inverter for the next operating cycle.

[0101] In this embodiment, the power difference is the output power of the inverter in the next operating cycle.

[0102] In this embodiment, the difference between the preset grid power and the AC load power is obtained; the difference power is used as the output power of the inverter in the next operating cycle.

[0103] Figure 6 This is a flowchart illustrating Embodiment 5 of a photovoltaic curtailment power detection method provided in this application. Based on the above embodiments, as follows... Figure 6 As shown, specifically, after step S205, the method further includes:

[0104] Step S601: Obtain the grid voltage.

[0105] Step S602: Based on the inverter's output power and grid voltage for the next operating cycle, obtain the inverter's current for the next operating cycle.

[0106] In this embodiment, the inverter current for the next operating cycle is obtained by dividing the output power of the inverter in the next operation by the grid voltage.

[0107] Step S603: Adjust the inverter according to the inverter current in the next operating cycle.

[0108] In this embodiment, the inverter controls the switching state of the power switching device by the difference between the output current and the inverter current in the next operating cycle, so that the output current is consistent with the inverter current in the next operating cycle.

[0109] In this embodiment, the grid voltage is obtained; based on the inverter's output power and grid voltage for the next operating cycle, the inverter current for the next operating cycle is obtained; based on the inverter current for the next operating cycle, the inverter is regulated to ensure its normal operation, thereby ensuring that the curtailed solar power can be effectively utilized by the AC load.

[0110] Figure 7 This is a flowchart illustrating a sixth embodiment of a photovoltaic curtailment power detection method provided in this application. Based on the above embodiments, as... Figure 7 As shown, a specific implementation of step S603 includes:

[0111] Step S701: Obtain the modulation signal based on the inverter current in the next operating cycle.

[0112] In this embodiment, the switching time of the power switching devices is controlled according to the inverter current in the next operating cycle.

[0113] In this embodiment, the modulation signal is the switching time of the power switching device.

[0114] Step S702: Adjust the inverter according to the modulation signal.

[0115] In this embodiment, the switching time of the power switching devices of the inverter is adjusted according to the modulation signal.

[0116] In this embodiment, a modulation signal is obtained based on the inverter current in the next operating cycle; the inverter is adjusted according to the modulation signal to obtain accurate output power.

[0117] Figure 8 This is a flowchart illustrating Embodiment 5 of a photovoltaic curtailment power detection method provided in this application. Based on the above embodiments, as follows... Figure 8 As shown, specifically, after step S202, the method further includes:

[0118] Step S801: If it is determined that the voltage of the DC bus is not within the preset voltage range, the inverter will be put into standby mode.

[0119] In this embodiment, if the voltage of the DC bus is not within the preset voltage range, the inverter will not operate in order to ensure the normal operation of the DC load.

[0120] In this embodiment, the voltage of the DC bus, the power of the AC load, and the curtailment power of the photovoltaic module are obtained; it is determined whether the voltage of the DC bus is within the preset voltage range; if it is determined that the voltage of the DC bus is not within the preset voltage range, the inverter is put into standby mode to enable the DC load to operate normally.

[0121] Figure 9 This is a flowchart illustrating an eighth embodiment of an inverter control method provided in this application. Figure 9 As shown, it includes:

[0122] Step S901: Obtain the DC bus voltage, AC load power, curtailed power of photovoltaic modules, and grid voltage.

[0123] Step S902: Determine whether the voltage of the DC bus is within the preset voltage range.

[0124] Step S903: If it is determined that the voltage of the DC bus is within the preset voltage range, the output power of the inverter for the current operating cycle is obtained based on the curtailment power of the photovoltaic modules.

[0125] Step S904: If it is determined that the voltage of the DC bus is not within the preset voltage range, the inverter will be put into standby mode.

[0126] Step S905: Determine whether the power of the AC load is greater than or equal to the output power of the inverter in the current operating cycle.

[0127] Step S906: If it is determined that the power of the AC load is greater than or equal to the output power of the inverter, the output power of the inverter in the current cycle is used as the output power of the inverter in the next operating cycle.

[0128] Step S907: If it is determined that the power of the AC load is less than the output power of the inverter, the output power of the inverter for the next operating cycle is obtained based on the preset minimum power of the power grid and the power of the AC load.

[0129] Step S908: Based on the inverter's output power and grid voltage for the next operating cycle, obtain the inverter's current for the next operating cycle.

[0130] Step S909: Obtain the modulation signal based on the inverter current in the next operating cycle.

[0131] Step S910: Adjust the inverter according to the modulation signal.

[0132] In this embodiment, the following parameters are obtained: DC bus voltage, AC load power, curtailed photovoltaic power, and grid voltage; whether the DC bus voltage is within a preset voltage range; if the DC bus voltage is within the preset voltage range, the inverter output power for the current operating cycle is obtained based on the curtailed photovoltaic power; if the DC bus voltage is outside the preset voltage range, the inverter is put into standby mode; whether the AC load power is greater than or equal to the inverter output power for the current operating cycle; if the AC load power is greater than or equal to the inverter output power, the inverter output power for the current cycle is used as the inverter output power for the next operating cycle; if the AC load power is less than the inverter output power, the inverter output power for the next operating cycle is obtained based on the preset minimum grid power and the AC load power; the inverter current for the next operating cycle is obtained based on the inverter output power and grid voltage; a modulation signal is obtained based on the inverter current for the next operating cycle; and the inverter is adjusted based on the modulation signal to effectively utilize the curtailed photovoltaic power while ensuring the normal operation of the DC load.

[0133] It should be noted that although the steps in the above embodiments are described in a specific order, those skilled in the art will understand that in order to achieve the effect of this application, different steps do not necessarily have to be executed in such an order. They can be executed simultaneously (in parallel) or in other orders, and these variations are all within the scope of protection of this application.

[0134] Furthermore, this application also provides an inverter device.

[0135] Figure 10This is a schematic diagram of the structure of an inverter device provided in an embodiment of this application. Figure 10 As shown, the inverter device in this embodiment mainly includes an acquisition module 21, a judgment module 22, a determination module 23, an analysis module 24, and a processing module 25. In some embodiments, one or more of the acquisition module 21, judgment module 22, determination module 23, analysis module 24, and processing module 25 can be combined into a single module. In some embodiments, the acquisition module 21 can be configured to acquire the voltage of the DC bus, the power of the AC load, and the curtailed power of the photovoltaic module. The judgment module 22 can be configured to determine whether the voltage of the DC bus is within a preset voltage range. The determination module 23 can be configured to, if the voltage of the DC bus is determined to be within the preset voltage range, obtain the output power of the inverter for the current operating cycle based on the curtailed power of the photovoltaic module. The analysis module 24 can be configured to determine the operating mode of the inverter based on the relationship between the power of the AC load and the output power of the inverter for the current operating cycle. The processing module 25 can be configured to determine the output power of the inverter for the next operating cycle based on the operating mode.

[0136] The aforementioned inverter is used for performing Figure 2 The inverter control method embodiments shown are similar in technical principle, the technical problems solved and the technical effects produced. Those skilled in the art can clearly understand that, for the sake of convenience and brevity, the specific working process of the inverter device and related descriptions can be found in the embodiments of the inverter control method, which will not be repeated here.

[0137] Those skilled in the art will understand that all or part of the processes in the method of the above-described embodiment can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable file, or some intermediate form. The computer-readable storage medium can include any entity or device capable of carrying the computer program code, a medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory, a random access memory, an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc. It should be noted that the content included in the computer-readable storage medium can be appropriately added or removed according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable storage medium does not include electrical carrier signals and telecommunication signals.

[0138] Furthermore, this application also provides an inverter.

[0139] Figure 11 This is a schematic diagram of an inverter provided in an embodiment of this application. Figure 11 As shown, in one embodiment of an inverter according to this application, the inverter includes a processor 31 and a memory 32. The memory 32 can be configured to store a program for executing the inverter control method of the above-described method embodiments, and the processor 31 can be configured to execute the program stored in the memory, including but not limited to a program for executing the inverter control method of the above-described method embodiments. For ease of explanation, only the parts related to the embodiments of this application are shown; for specific technical details not disclosed, please refer to the method section of the embodiments of this application. The inverter can be a control device device comprising various electronic devices.

[0140] Furthermore, this application also provides a computer-readable storage medium. In one embodiment of the computer-readable storage medium according to this application, the computer-readable storage medium can be configured to store a program that performs the inverter control method of the above-described method embodiments. This program can be loaded and run by a processor to implement the above-described inverter control method. For ease of explanation, only the parts related to the embodiments of this application are shown; for specific technical details not disclosed, please refer to the method section of the embodiments of this application. The computer-readable storage medium can be a storage device device comprising various electronic devices. Optionally, in the embodiments of this application, the computer-readable storage medium is a non-transitory computer-readable storage medium.

[0141] Furthermore, it should be understood that since the various modules are only provided to illustrate the functional units of the device described in this application, the physical devices corresponding to these modules may be the processor itself, or a part of the processor's software, hardware, or a combination of both. Therefore, the number of modules shown in the figures is merely illustrative.

[0142] Those skilled in the art will understand that the various modules in the device can be adaptively split or combined. Such splitting or combining of specific modules will not cause the technical solution to deviate from the principles of this application; therefore, the technical solutions after splitting or combining will fall within the protection scope of this application.

[0143] The technical solutions of this application have been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of this application is obviously not limited to these specific embodiments. Without departing from the principles of this application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of this application.

Claims

1. An inverter control method characterized by, include: Obtain the DC bus voltage, AC load power, and curtailed power of photovoltaic modules; Determine whether the voltage of the DC bus is within the preset voltage range; If it is determined that the voltage of the DC bus is within the preset voltage range, the output power of the inverter for the current operating cycle is obtained based on the curtailment power of the photovoltaic module. The inverter's operating mode is determined based on the relationship between the power of the AC load and the output power of the inverter in the current operating cycle. Based on the operating mode, the inverter's output power for the next operating cycle is determined.

2. The method of claim 1, wherein, The step of determining the inverter's operating mode based on the relationship between the AC load power and the inverter's output power in the current operating cycle includes: Determine whether the power of the AC load is greater than or equal to the output power of the inverter in the current operating cycle; If it is determined that the power of the AC load is greater than or equal to the output power of the inverter, then the operating mode is determined to be operating mode 1; The step of determining the inverter's output power for the next operating cycle according to the operating mode includes: using the inverter's output power for the current cycle as the inverter's output power for the next operating cycle according to the operating mode 1.

3. The method of claim 1, wherein, The method for determining the inverter's operating mode based on the relationship between the AC load power and the inverter's output power during the current operating cycle further includes: Determine whether the power of the AC load is greater than or equal to the output power of the inverter in the current operating cycle; If it is determined that the power of the AC load is less than the output power of the inverter, then the operating mode is determined to be operating mode 2; The step of determining the inverter's output power for the next operating cycle based on the operating mode includes: Based on the operating mode 2, the inverter output power for the next operating cycle is obtained according to the preset minimum power of the power grid and the power of the AC load.

4. The method of claim 3, wherein, The step of obtaining the inverter's output power for the next operating cycle based on the preset minimum grid power and the power of the AC load includes: The difference between the preset grid power and the AC load power is used to obtain the difference power. The difference in power is used as the output power of the inverter in the next operating cycle.

5. The method of claim 1, wherein, The method further includes: Obtain the grid voltage; The inverter current for the next operating cycle is obtained based on the inverter's output power and the grid voltage for the next operating cycle. The inverter is adjusted according to the inverter current in the next operating cycle.

6. The method of claim 5, wherein, The step of adjusting the inverter based on the inverter current in the next operating cycle includes: The modulation signal is obtained based on the inverter current in the next operating cycle; The inverter is regulated according to the modulation signal.

7. The method of claim 1, wherein, The method further includes: If it is determined that the voltage of the DC bus is not within the preset voltage range, the inverter will be put into standby mode.

8. An inverter device, characterized by comprising: include: The acquisition module is used to acquire the voltage of the DC bus, the power of the AC load, and the curtailed power of the photovoltaic modules; The judgment module is used to determine whether the voltage of the DC bus is within a preset voltage range; The determination module is used to determine the output power of the inverter for the current operating cycle based on the curtailment power of the photovoltaic module if the voltage of the DC bus is determined to be within a preset voltage range. The analysis module is used to determine the operating mode of the inverter based on the relationship between the power of the AC load and the output power of the inverter in the current operating cycle. The processing module is used to determine the inverter's output power for the next operating cycle based on the operating mode.

9. An inverter comprising at least one processor and a memory; wherein, The memory stores computer-executed instructions; The at least one processor executes computer execution instructions stored in the memory, causing the at least one processor to perform the method of any one of claims 1 to 7.

10. A computer readable storage medium having stored therein a plurality of program codes, characterized in that, The program code is adapted to be loaded and run by a processor to perform the method of any one of claims 1 to 7.

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