Control method and system for photovoltaic power generating system, and related device

Abstract

The present disclosure relates to the technical field of photovoltaic power generation, and relates to a control method and system for a photovoltaic power generation system, and a related device. The control method for a photovoltaic power generation system comprises: monitoring the remaining amount of a power generation power of a photovoltaic power generation system, wherein the photovoltaic power generation system comprises one or more photovoltaic modules, and each photovoltaic module drives one or more photovoltaic direct-drive devices; in response to the remaining amount of the power generation power being greater than a threshold value, determining the operating state of the one or more photovoltaic direct-drive devices; and on the basis of the operating state of the one or more photovoltaic direct-drive devices, controlling the power generation power of at least one photovoltaic module.

Description

Control methods, systems and related equipment for photovoltaic power generation systems

[0001] Cross-reference to related applications

[0002] This application is based on and claims priority to Chinese application No. 202411597820.3, filed on November 11, 2024, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0003] This disclosure relates to the field of photovoltaic power generation technology, and in particular to a control method, system and related equipment for a photovoltaic power generation system. Background Technology

[0004] Photovoltaic power generation and consumption systems utilize the electricity generated by photovoltaic panels to drive user equipment. For example, photovoltaic air conditioning systems use direct-drive photovoltaic technology to directly supply the direct current generated by solar panels to the air conditioner, reducing losses during energy conversion and improving energy efficiency. With the continuous development of photovoltaic air conditioning technology, the performance of photovoltaic air conditioners, as the interface between distributed energy sources and the power grid, will directly determine the quality of distributed energy generation, and the quality of power generation will affect whether it can be successfully connected to the grid. Summary of the Invention

[0005] According to a first aspect of some embodiments of the present disclosure, a control method for a photovoltaic power generation system is provided, comprising: monitoring the remaining power output of the photovoltaic power generation system, the photovoltaic power generation system including one or more photovoltaic modules, each photovoltaic module driving one or more photovoltaic direct drive devices; determining the operating state of the one or more photovoltaic direct drive devices in response to the remaining power output being greater than a threshold; and controlling the power output of at least one photovoltaic module based on the operating state of the one or more photovoltaic direct drive devices.

[0006] In some embodiments, controlling the power generation of at least one photovoltaic module based on the operating state of one or more photovoltaic direct drive devices includes: determining a target photovoltaic module from one or more photovoltaic modules used to drive unpowered photovoltaic direct drive devices; and reducing the power generation of the target photovoltaic module.

[0007] In some embodiments, reducing the power generation of a target photovoltaic module includes: determining a target value based on the difference between the remaining power generation and a threshold; and reducing the power generation of the target photovoltaic module, wherein the power generation is reduced by the target value.

[0008] In some embodiments, controlling the power generation of at least one photovoltaic module according to the operating state of one or more photovoltaic direct drive devices further includes: after reducing the power generation of the target photovoltaic module, if the remaining power generation of the photovoltaic power generation system is not greater than a threshold, the power generation of the photovoltaic module used to drive the activated photovoltaic direct drive device remains unchanged.

[0009] In some embodiments, controlling the power generation of at least one photovoltaic module according to the operating state of one or more photovoltaic direct drive devices further includes: reducing the power generation of the photovoltaic module used to drive the photovoltaic direct drive device if the remaining power generation of the photovoltaic power generation system is still greater than a threshold after reducing the power generation of the target photovoltaic module.

[0010] In some embodiments, reducing the power generation of the photovoltaic module used to drive the activated photovoltaic direct drive device includes: determining an adjustable range of the first photovoltaic module based on the difference between the power generation of the first photovoltaic module used to drive the activated photovoltaic direct drive device and the power consumption of the activated photovoltaic direct drive device; and reducing the power generation of the first photovoltaic module based on the adjustable range.

[0011] In some embodiments, reducing the power generation of the photovoltaic modules used to drive the activated photovoltaic direct drive equipment further includes: in response to the fact that the remaining power generation of the photovoltaic power generation system is still greater than a threshold after reducing the power generation of the first photovoltaic module, identifying a second photovoltaic module from the first photovoltaic module; and reducing the power generation of the second photovoltaic module.

[0012] In some embodiments, the control method further includes: after controlling the power generation of at least one photovoltaic module, in response to the remaining power generation of the photovoltaic power generation system being greater than 0, transmitting the remaining power generation to the grid.

[0013] According to a second aspect of some embodiments of the present disclosure, a control device for a photovoltaic power generation system is provided, comprising: a monitoring module configured to monitor the remaining power output of the photovoltaic power generation system, the photovoltaic power generation system including one or more photovoltaic modules, each photovoltaic module driving one or more photovoltaic direct drive devices; a determination module configured to determine the operating state of the one or more photovoltaic direct drive devices in response to the remaining power output being greater than a threshold; and a control module configured to control the power output of at least one photovoltaic module based on the operating state of the one or more photovoltaic direct drive devices.

[0014] According to a third aspect of some embodiments of the present disclosure, a control device for a photovoltaic power generation system is provided, comprising: a memory; and a processor coupled to the memory, the processor being configured to execute a control method for a photovoltaic power generation system according to any embodiment of the present disclosure based on instructions stored in the memory.

[0015] According to a fourth aspect of some embodiments of the present disclosure, a photovoltaic power generation system is provided, comprising: a control device for a photovoltaic power generation system according to any embodiment of the present disclosure; one or more photovoltaic direct drive devices; and one or more photovoltaic modules, each photovoltaic module driving at least one photovoltaic direct drive device.

[0016] In some embodiments, the photovoltaic power generation system further includes: a power acquisition module, configured to acquire the power consumption of the photovoltaic power generation system and send the power consumption to the control device of the photovoltaic power generation system.

[0017] In some embodiments, one or more photovoltaic direct drive devices include a master device and one or more slave devices, and the control device of the photovoltaic power generation system is deployed on the master device.

[0018] In some embodiments, the photovoltaic direct-drive device is a photovoltaic air conditioner.

[0019] According to a fifth aspect of some embodiments of the present invention, a computer-readable storage medium is provided having a computer program stored thereon, wherein the program, when executed by a processor, implements the control method of any of the aforementioned photovoltaic power generation systems.

[0020] According to a sixth aspect of some embodiments of the present invention, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the control method of any of the aforementioned photovoltaic power generation systems.

[0021] According to a seventh aspect of some embodiments of the present invention, a computer program product is provided that, when the computer program product is run on a computer, causes the computer to implement any of the aforementioned control methods for a photovoltaic power generation system.

[0022] According to a seventh aspect of some embodiments of the present invention, a computer program is provided, comprising: instructions that, when executed by a processor, cause the processor to perform any of the aforementioned control methods for a photovoltaic power generation system.

[0023] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 shows a schematic diagram of the structure of a photovoltaic power generation system according to some embodiments of the present disclosure.

[0026] Figure 2 shows a flowchart illustrating a control method for a photovoltaic power generation system according to some embodiments of the present invention.

[0027] Figure 3 shows a schematic flowchart of a method for controlling power generation according to some embodiments of the present disclosure.

[0028] Figure 4 shows a schematic flowchart of a method for controlling power generation according to some embodiments of the present disclosure.

[0029] Figure 5 shows a schematic flowchart of a control method for a photovoltaic power generation system according to other embodiments of the present disclosure.

[0030] Figure 6 shows a schematic diagram of the structure of a control device for a photovoltaic power generation system according to some embodiments of the present disclosure.

[0031] Figure 7 shows a schematic diagram of the structure of a photovoltaic air conditioning system according to some embodiments of the present disclosure.

[0032] Figure 8 shows a schematic diagram of the structure of a control device for a photovoltaic power generation system according to other embodiments of the present invention.

[0033] Figure 9 shows a schematic diagram of the structure of the control device of a photovoltaic power generation system according to some embodiments of the present invention. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention.

[0036] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0037] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0038] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0039] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0040] Because excess electricity from photovoltaic power generation systems can cause instability and harmonic pollution when fed into the public power grid, and because photovoltaic power is not dispatchable, some regions have high requirements for grid connection, which affects the normal grid connection of photovoltaic air conditioners.

[0041] With the widespread adoption of distributed photovoltaic (PV) power stations, some regional power systems are unable to withstand the impact of these stations, highlighting serious issues such as aging AC systems and insufficient capacity. Power grid companies require that in self-consumption grid-connected modes, reverse power protection devices should be installed on the user's incoming line to prevent power flow changes caused by backfeeding from affecting upstream substations.

[0042] Figure 1 shows a schematic diagram of a photovoltaic power generation system according to some embodiments of the present disclosure. As shown in Figure 1, the system 1 includes one or more photovoltaic modules 11-1, 11-2...11-N, and one or more photovoltaic direct drive devices 12-1, 12-2...12-N, with each photovoltaic module driving at least one photovoltaic direct drive device. Thus, the photovoltaic direct drive devices can directly utilize the direct current generated by the photovoltaic modules to operate.

[0043] System 1 may also include one or more AC loads 13 (only one is shown as an example in the figure), and the remaining power generated after the photovoltaic direct drive device 12 is consumed can be supplied to the AC load 13.

[0044] Afterwards, if there is still residual power in the entire system, it can be fed into the AC power grid 14.

[0045] When performing reverse power control on a photovoltaic (PV) power generation system, it is also necessary to consider the power generation efficiency of the PV system itself. This disclosure provides a control method for a PV power generation system to improve the grid integration rate of PV power generation and the power generation efficiency of the PV system.

[0046] In the embodiments of this disclosure, the power generation of the photovoltaic modules is controlled according to the operating state of the photovoltaic direct-drive equipment. An embodiment of the control method for the photovoltaic power generation system of this disclosure is described below with reference to FIG2.

[0047] Figure 2 shows a flowchart illustrating a control method for a photovoltaic power generation system according to some embodiments of the present invention. As shown in Figure 2, the control method for the photovoltaic power generation system in this embodiment includes steps S202 to S206.

[0048] In step S202, the remaining power output of the photovoltaic power generation system is monitored. The photovoltaic power generation system includes one or more photovoltaic modules, each of which drives one or more photovoltaic direct-drive devices. An example of a photovoltaic power generation system can be found in Figure 1.

[0049] The surplus power refers to the difference between the total power generated and the total power consumed by a photovoltaic power generation system. This surplus can be determined by monitoring the power generation and consumption of each device within the photovoltaic power generation system.

[0050] For example, photovoltaic (PV) direct-drive systems can be distributed, meaning the system may include one master PV direct-drive unit and one or more slave PV direct-drive units. The master PV direct-drive unit can obtain the power generation or remaining power of the PV modules associated with it (i.e., the PV modules used to drive the master PV direct-drive unit). Furthermore, the master PV direct-drive unit can obtain the power generation or remaining power of each slave PV direct-drive unit through the communication lines between the master and slave PV direct-drive units (which can be wired or wireless). In addition, other monitoring devices in the system can send the power consumption of other loads (e.g., AC loads) to the master PV direct-drive unit. Therefore, the master PV direct-drive unit can calculate the remaining power of the PV power generation system.

[0051] The remaining power output of a photovoltaic power generation system can be periodically acquired at specified time intervals.

[0052] In step S204, in response to the remaining amount of power generation being greater than a threshold, the operating status of one or more photovoltaic direct drive devices is determined.

[0053] The threshold is a preset value that can be set as needed. For example, if the power grid does not accept any power from the photovoltaic system, the threshold can be set to 0. If the power grid can appropriately accept power from the photovoltaic system, the threshold can be determined based on the grid's acceptable capacity.

[0054] The operating status of a photovoltaic (PV) direct-drive device indicates whether it is turned on. For a non-activated PV direct-drive device, the power generated by the associated PV modules will not be consumed by the device, but will instead be supplied to other AC loads in the system or fed back to the grid.

[0055] In step S206, the power generation of at least one photovoltaic module is controlled according to the operating status of one or more photovoltaic direct drive devices.

[0056] That is, for photovoltaic direct-drive equipment in different operating states, a control strategy for the photovoltaic modules driving the equipment can be determined based on the operating state of each photovoltaic direct-drive device. This strategy may include whether to control the power generation and how to control the power generation. Based on this control strategy, the power generation of the photovoltaic modules can then be controlled, for example, by reducing it or keeping it unchanged.

[0057] Since photovoltaic (PV) modules directly drive PV direct-drive equipment, the power generated by the PV modules is directly used for the equipment they drive, reducing intermediate power conversion steps. For example, if PV direct-drive equipment in the startup state requires electricity, its power generation will be kept constant; if PV direct-drive equipment in the non-starting state does not require electricity, its power generation will be reduced.

[0058] The embodiments of this disclosure control the power generation of photovoltaic modules by utilizing the operating state of photovoltaic direct drive equipment. This allows for the prior consideration of the impact of controlling the power generation on photovoltaic direct drive equipment under different states, thereby reducing losses and improving the power generation efficiency of photovoltaic power generation system while controlling the remaining power generation of photovoltaic power generation system.

[0059] When controlling the power generation of a photovoltaic power generation system, the photovoltaic modules corresponding to the photovoltaic direct-drive equipment that is not started can be preferentially reduced. Figure 3 shows a schematic flowchart of a power generation control method according to some embodiments of the present disclosure. As shown in Figure 3, the control method of this embodiment includes steps S302 to S304.

[0060] In step S302, a target photovoltaic module is determined from one or more photovoltaic modules used to drive an unactivated photovoltaic direct drive device.

[0061] The photovoltaic modules corresponding to some or all of the photovoltaic direct drive equipment that are not turned on can be identified as the target photovoltaic modules.

[0062] In step S304, the power generation of the target photovoltaic module is reduced.

[0063] The purpose of reducing power generation is to control the remaining power output of the photovoltaic power generation system below a threshold. Therefore, a target value can be determined first based on the difference between the current remaining power output and the threshold. The target value can be this difference, or it can be a value determined based on this difference and a preset fluctuation value, allowing for more flexible adjustments.

[0064] In some embodiments, the power generation of target photovoltaic (PV) modules is reduced, wherein the power generation is reduced by a target value. If multiple PV modules have their power generation reduced, the sum of the power generation reductions for these multiple PV modules equals the target value. In this way, the remaining power generation of the system can be reduced below a threshold simply by reducing the power generation of the PV modules corresponding to the non-activated PV direct-drive equipment. Effective control of the system's power generation is achieved without affecting the power consumption of the activated PV direct-drive equipment.

[0065] When selecting photovoltaic modules, the target value can be allocated to a first number (a larger number) of photovoltaic modules, or the target value can be concentrated and allocated to a second number (a smaller number) of photovoltaic modules, where the first number is greater than the second number.

[0066] The above embodiments, by reducing the power generation of the photovoltaic modules used to drive the unactivated photovoltaic direct-drive equipment, enable control over the remaining power generation of the system. Since the equipment corresponding to these photovoltaic modules is not activated, reducing the power generation of these modules does not affect the operation of the equipment in the system or energy loss, thereby improving power generation efficiency.

[0067] The embodiments of this disclosure can also perform multiple controls on photovoltaic modules corresponding to photovoltaic direct drive equipment in different operating states.

[0068] In some embodiments, if the remaining power output of the photovoltaic power generation system after reducing the power output of the target photovoltaic module does not exceed a threshold, the power output of the photovoltaic module used to drive the activated photovoltaic direct-drive equipment remains unchanged. That is, the power output of the photovoltaic module corresponding to the non-activated equipment is first reduced, and then it is checked whether the adjustment meets the threshold requirement. If the adjustment of the photovoltaic module corresponding to the non-activated equipment already meets the requirement, the power output of the photovoltaic module used to drive the activated photovoltaic direct-drive equipment remains unchanged. In cases where the threshold requirement can be met simply by reducing the power output of the photovoltaic module corresponding to the non-activated photovoltaic direct-drive equipment, this embodiment does not adjust the power output of the photovoltaic module used to drive the activated photovoltaic direct-drive equipment. Thus, effective control of the system's power output is achieved without affecting the power consumption of the activated photovoltaic direct-drive equipment.

[0069] In some cases, most devices in the system are running, while only a small number are not. In this situation, controlling only the photovoltaic modules used to drive the non-started devices is insufficient to meet the set threshold for remaining power consumption. Therefore, the power generation of the photovoltaic modules corresponding to the started devices can be further adjusted. Figure 4 shows a flowchart illustrating a power generation control method according to some embodiments of this disclosure. As shown in Figure 4, the control method of this embodiment includes steps S402 to S406.

[0070] In step S402, a target photovoltaic module is determined from one or more photovoltaic modules used to drive an unactivated photovoltaic direct drive device.

[0071] In step S404, the power generation of the target photovoltaic module is reduced.

[0072] In step S406, if the remaining power generation of the photovoltaic power generation system is still greater than the threshold after reducing the power generation power of the target photovoltaic module, the power generation power of the photovoltaic module used to drive the photovoltaic direct drive equipment that has been turned on is reduced.

[0073] The power reduction operations in steps S404 and S406 can be performed sequentially or simultaneously. For example, after step S404 is executed, the remaining power generation of the current system can be monitored again, and then step S406 can be executed. Alternatively, after determining the power reduction required for the target photovoltaic module, the further power reduction value can be calculated, and then steps S404 and S406 can be executed according to the determined power values, and in any order.

[0074] The above embodiments prioritize adjusting the photovoltaic modules used to drive the inactive direct-drive photovoltaic (PV) equipment. If this adjustment is insufficient to meet the requirements, the power output of the photovoltaic modules used to drive the active PV direct-drive equipment is then reduced. This approach satisfies the system's power reserve requirements while minimizing the impact on the active PV direct-drive equipment.

[0075] The following describes, exemplarily, how to adjust the power output used to drive an already activated photovoltaic direct-drive device.

[0076] In some embodiments, an adjustable range for the first photovoltaic module is determined based on the difference between the power generation of the first photovoltaic module used to drive the activated photovoltaic direct-drive equipment and the power consumption of the activated photovoltaic direct-drive equipment. Based on this adjustable range, the power generation of the first photovoltaic module is reduced. For example, the difference between the power generation of the first photovoltaic module and the power consumption of the activated photovoltaic direct-drive equipment can be used as the upper limit of the adjustable range, and the lower limit of the adjustable range is 0. The reduction value can be selected from this range. In this way, the power generation of the adjusted photovoltaic module can be greater than the power consumption of the equipment it drives, allowing the power generated by the adjusted photovoltaic module to still be directly used for the equipment, reducing intermediate energy conversion steps, reducing losses, and improving the system's power generation efficiency.

[0077] If this method still fails to meet the system's remaining power generation requirements, the power generation of the photovoltaic modules used to drive the activated direct-drive photovoltaic equipment can be further reduced. In some embodiments, in response to the situation where the remaining power generation of the photovoltaic power generation system is still greater than a threshold after reducing the power generation of the first photovoltaic module, a second photovoltaic module is identified from the first photovoltaic modules; the power generation of the second photovoltaic module is then reduced. When reducing the power generation of the second photovoltaic module, the limitation of the adjustable range on the adjustment value can be disregarded. That is, there may be situations where the power generation of the photovoltaic module cannot fully meet the usage requirements of the equipment it drives. However, since the equipment can also be driven based on the power from the grid or other photovoltaic modules, it will not have a significant impact on the normal use of the equipment. Furthermore, this method maximizes the direct supply of the electrical energy generated by the photovoltaic modules to the equipment they directly drive, thus maximizing power generation efficiency in special scenarios.

[0078] In some embodiments, the various embodiments described above can be combined to address a variety of possible situations. Figure 5 shows a schematic flowchart of a control method for a photovoltaic power generation system according to other embodiments of the present disclosure. As shown in Figure 5, the control method of this embodiment includes steps S502 to S510.

[0079] In step S502, in response to the remaining amount of power generation being greater than a threshold, the operating status of one or more photovoltaic direct drive devices is determined.

[0080] In step S504, a target photovoltaic module is identified from one or more photovoltaic modules used to drive an unactivated photovoltaic direct drive device, and the power generation of the target photovoltaic module is reduced.

[0081] Then, if the remaining power generation capacity is not greater than the threshold, step S506 is executed; otherwise, step S504 is executed again, or step S508 is executed.

[0082] In step S506, the power generation of the photovoltaic modules used to drive the activated photovoltaic direct drive equipment remains unchanged.

[0083] In step S508, the adjustable range of the first photovoltaic module is determined based on the difference between the power generation of the first photovoltaic module used to drive the activated photovoltaic direct drive equipment and the power consumption of the activated photovoltaic direct drive equipment, and the power generation of the first photovoltaic module is reduced based on the adjustable range.

[0084] Subsequently, in response to the remaining amount of power generation being greater than the threshold, step S510 is executed.

[0085] In step S510, a second photovoltaic module is determined from the first photovoltaic module, and the power generation of the second photovoltaic module is reduced.

[0086] Through the above embodiments, the power generation of the photovoltaic modules used to drive the unactivated photovoltaic direct-drive equipment can be reduced first. If the threshold requirement cannot be met, the power generation of the first photovoltaic module of the activated photovoltaic direct-drive equipment can be reduced while ensuring photovoltaic direct drive capability. If the threshold requirement still cannot be met, the power generation of the second photovoltaic module of some activated photovoltaic direct-drive equipment can be further reduced. Therefore, the embodiments of this disclosure can minimize losses and improve system power generation efficiency while reducing the impact of the photovoltaic power generation system on the power grid.

[0087] In some embodiments, after controlling the power generation of at least one photovoltaic module, in response to the remaining power generation of the photovoltaic power generation system being greater than 0, the remaining power generation is transmitted to the grid. Because the embodiments of this disclosure can control the remaining power generation to ensure it does not exceed a preset threshold, the impact of the power generation transmitted to the grid on the grid is reduced, and the grid absorption rate and power generation efficiency of the photovoltaic power generation system are improved.

[0088] The methods of various embodiments of this disclosure have been described above. The apparatus for performing the methods described above is described below.

[0089] Figure 6 shows a schematic diagram of the structure of a control device for a photovoltaic power generation system according to some embodiments of the present disclosure. As shown in Figure 6, the control device 60 of this embodiment includes: a monitoring module 610 configured to monitor the remaining power output of the photovoltaic power generation system, the photovoltaic power generation system including one or more photovoltaic modules, each photovoltaic module driving one or more photovoltaic direct drive devices; a determination module 620 configured to determine the operating state of one or more photovoltaic direct drive devices in response to the remaining power output being greater than a threshold; and a control module 630 configured to control the power output of at least one photovoltaic module based on the operating state of the one or more photovoltaic direct drive devices.

[0090] In some embodiments, the control module 630 is further configured to: determine a target photovoltaic module from one or more photovoltaic modules used to drive an unactivated photovoltaic direct drive device; and reduce the power generation of the target photovoltaic module.

[0091] In some embodiments, the control module 630 is further configured to: determine a target value based on the difference between the remaining amount of current power generation and a threshold; and reduce the power generation of the target photovoltaic module, wherein the power generation is reduced by the target value.

[0092] In some embodiments, the control module 630 is further configured to maintain the power generation of the photovoltaic module used to drive the activated photovoltaic direct drive device if the remaining power generation of the photovoltaic power generation system is not greater than a threshold after the power generation power of the target photovoltaic module is reduced.

[0093] In some embodiments, the control module 630 is further configured to: reduce the power generation of the photovoltaic module used to drive the photovoltaic direct drive device if the remaining power generation of the photovoltaic power generation system is still greater than a threshold after reducing the power generation of the target photovoltaic module.

[0094] In some embodiments, the control module 630 is further configured to: determine an adjustable range of the first photovoltaic module based on the difference between the power generation of the first photovoltaic module used to drive the activated photovoltaic direct drive device and the power consumption of the activated photovoltaic direct drive device; and reduce the power generation of the first photovoltaic module based on the adjustable range.

[0095] In some embodiments, the control module 630 is further configured to: in response to the fact that the remaining amount of the current power generation of the photovoltaic power generation system is still greater than a threshold after reducing the power generation power of the first photovoltaic module, identify a second photovoltaic module from the first photovoltaic module; and reduce the power generation power of the second photovoltaic module.

[0096] In some embodiments, the control device 60 further includes a transmission module 604 configured to transmit the remaining power to the grid after controlling the power generation of at least one photovoltaic module, in response to the remaining power generation of the photovoltaic power generation system being greater than 0.

[0097] Embodiments of this disclosure also provide a photovoltaic power generation system, including: a control device for a photovoltaic power generation system according to any embodiment of this disclosure; one or more photovoltaic direct drive devices; and one or more photovoltaic modules, each photovoltaic module driving at least one photovoltaic direct drive device.

[0098] In some embodiments, the photovoltaic power generation system further includes: a power acquisition module, configured to acquire the power consumption of the photovoltaic power generation system and send the power consumption to the control device of the photovoltaic power generation system.

[0099] In some embodiments, one or more photovoltaic direct-drive devices include a master device and one or more slave devices, with the control device of the photovoltaic power generation system deployed on the master device. Thus, centralized decision-making and control can be performed through the master device, and the power generation can be controlled using existing communication and control mechanisms between the master and slave devices.

[0100] In some embodiments, the photovoltaic direct-drive device is a photovoltaic air conditioner. Therefore, the solutions disclosed herein can be applied to photovoltaic air conditioning systems to improve the power generation efficiency and reduce losses.

[0101] Figure 7 shows a schematic diagram of a photovoltaic air conditioning system according to some embodiments of the present disclosure. As shown in Figure 7, the system 7 includes one or more photovoltaic modules 71-1, 71-2...71-N, and one or more photovoltaic air conditioners 72-1, 72-2...72-N. Each photovoltaic module drives at least one photovoltaic direct-drive device. Thus, the photovoltaic direct-drive device can directly utilize the direct current generated by the photovoltaic modules for operation. Photovoltaic air conditioner 72-1 is the master unit, and photovoltaic air conditioners 71-2...71-N are slave units. Communication lines can be deployed between the photovoltaic air conditioners (as shown by the dotted lines in the figure). Photovoltaic air conditioner 72-1, as the master unit, can collect the operating information, working status, and power generation or remaining power of the photovoltaic modules used to drive these slave units from the slave units. Therefore, the master unit can control the slave units and their corresponding photovoltaic modules.

[0102] System 7 may also include one or more AC loads 73 (only one is shown as an example in the figure), and the remaining power generated after the photovoltaic direct drive equipment is consumed can be supplied to the AC loads 73.

[0103] In addition, system 7 may also include a reverse power control device 74 for acquiring power consumption information in the system.

[0104] In the photovoltaic air conditioning system, the remaining electricity is fed back to the AC power grid 75.

[0105] Figure 8 shows a schematic diagram of the structure of a control device for a photovoltaic power generation system according to some other embodiments of the present invention. As shown in Figure 8, the control device 80 of the photovoltaic power generation system in this embodiment includes: a memory 810 and a processor 820 coupled to the memory 810. The processor 820 is configured to execute the control method of the photovoltaic power generation system in any of the foregoing embodiments based on instructions stored in the memory 810.

[0106] The memory 810 may include, for example, system memory, fixed non-volatile storage media, etc. The system memory may store, for example, the operating system, application programs, boot loader, and other programs.

[0107] Figure 9 shows a schematic diagram of the structure of a control device for a photovoltaic power generation system according to some embodiments of the present invention. As shown in Figure 9, the control device 90 of the photovoltaic power generation system in this embodiment includes a memory 910 and a processor 920, and may also include an input / output interface 930, a network interface 940, a storage interface 950, etc. These interfaces 930, 940, 950, and the memory 910 and processor 920 can be connected, for example, via a bus 960. The input / output interface 930 provides a connection interface for input / output devices such as a display, mouse, keyboard, and touchscreen. The network interface 940 provides a connection interface for various networked devices. The storage interface 950 provides a connection interface for external storage devices such as SD cards and USB flash drives.

[0108] Embodiments of the present invention also provide a computer-readable storage medium having a computer program stored thereon, characterized in that the program, when executed by a processor, implements any of the aforementioned control methods for a photovoltaic power generation system.

[0109] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable non-transitory storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0110] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in one or more blocks of the flowchart illustrations and / or one or more blocks of the block diagrams.

[0111] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means that implement the functions specified in one or more flowcharts and / or one or more block diagrams.

[0112] These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, such that the instructions, which execute on the computer or other programmable apparatus, provide steps for implementing the functions specified in one or more flowcharts and / or one or more block diagrams.

[0113] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. Control methods for photovoltaic power generation systems, including: Monitor the remaining power output of a photovoltaic power generation system, which includes one or more photovoltaic modules, each of which drives one or more photovoltaic direct drive devices; In response to the remaining amount of power generation being greater than a threshold, the operating status of the one or more photovoltaic direct drive devices is determined; The power generation of at least one photovoltaic module is controlled according to the operating status of the one or more photovoltaic direct drive devices.

2. The control method according to claim 1, wherein, The step of controlling the power generation of at least one photovoltaic module according to the operating status of the one or more photovoltaic direct drive devices includes: Identify the target photovoltaic module from one or more photovoltaic modules used to drive an unactivated direct-drive photovoltaic device; Reduce the power generation of the target photovoltaic module.

3. The control method according to claim 2, wherein, The reduction of the power generation of the target photovoltaic module includes: The target value is determined based on the difference between the current remaining power generation capacity and the threshold. Reduce the power generation of the target photovoltaic module, wherein the power generation is reduced by the target value.

4. The control method according to claim 2 or 3, wherein, The step of controlling the power generation of at least one photovoltaic module according to the operating status of the one or more photovoltaic direct drive devices further includes: After reducing the power generation of the target photovoltaic module, if the remaining power generation of the photovoltaic power generation system is not greater than the threshold, the power generation of the photovoltaic module used to drive the activated photovoltaic direct drive equipment remains unchanged.

5. The control method according to any one of claims 2 to 4, wherein, The step of controlling the power generation of at least one photovoltaic module according to the operating status of the one or more photovoltaic direct drive devices further includes: If, after reducing the power generation of the target photovoltaic module, the remaining power generation of the photovoltaic power generation system is still greater than the threshold, the power generation of the photovoltaic module used to drive the activated photovoltaic direct drive equipment is reduced.

6. The control method according to claim 5, wherein, The reduction of the power generation of the photovoltaic modules used to drive the activated photovoltaic direct-drive equipment includes: The adjustable range of the first photovoltaic module is determined based on the difference between the power generation of the first photovoltaic module used to drive the activated photovoltaic direct drive equipment and the power consumption of the activated photovoltaic direct drive equipment. Based on the adjustable range, the power generation of the first photovoltaic module is reduced.

7. The control method according to claim 6, wherein, The reduction of the power generation of the photovoltaic modules used to drive the activated photovoltaic direct-drive equipment also includes: In response to the fact that the remaining power generation of the photovoltaic power generation system is still greater than a threshold after reducing the power generation power of the first photovoltaic module, a second photovoltaic module is determined from the first photovoltaic module; Reduce the power generation of the second photovoltaic module.

8. The control method according to any one of claims 1 to 7, further comprising: After controlling the power generation of at least one photovoltaic module, in response to the remaining power generation of the photovoltaic power generation system being greater than 0, the remaining power generation is transmitted to the grid.

9. A control device for a photovoltaic power generation system, comprising: The monitoring module is configured to monitor the remaining power output of a photovoltaic power generation system, which includes one or more photovoltaic modules, each of which drives one or more photovoltaic direct drive devices. The determination module is configured to determine the operating status of the one or more photovoltaic direct drive devices in response to the remaining amount of the generated power being greater than a threshold. The control module is configured to control the power generation of at least one photovoltaic module based on the operating status of the one or more photovoltaic direct drive devices.

10. A control device for a photovoltaic power generation system, comprising: Memory; as well as A processor coupled to the memory, the processor being configured to execute a control method for a photovoltaic power generation system as described in any one of claims 1 to 8 based on instructions stored in the memory.

11. A photovoltaic power generation system, comprising: Control device for photovoltaic power generation system according to claim 9 or 10; One or more photovoltaic direct drive devices; as well as One or more photovoltaic modules, each photovoltaic module driving at least one photovoltaic direct drive device.

12. The photovoltaic power generation system according to claim 11, further comprising: The power acquisition module is configured to acquire the power consumption of the photovoltaic power generation system and send the power consumption to the control device of the photovoltaic power generation system.

13. The photovoltaic power generation system according to claim 11 or 12, wherein, The one or more photovoltaic direct-drive devices include a master device and one or more slave devices, and the control device of the photovoltaic power generation system is deployed on the master device.

14. The photovoltaic power generation system according to any one of claims 11 to 13, wherein, The photovoltaic direct-drive device is a photovoltaic air conditioner.

15. A computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the control method of the photovoltaic power generation system according to any one of claims 1 to 8.

16. A computer program product, when run on a computer, causes the computer to implement the control method of the photovoltaic power generation system according to any one of claims 1 to 8.

17. A computer program comprising: Instructions, when executed by a processor, cause the processor to perform the control method for a photovoltaic power generation system according to any one of claims 1 to 8.

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