Control method and system of photovoltaic power generation system and related equipment

Abstract

The invention relates to a control method and system of a photovoltaic power generation system and related equipment, and relates to the technical field of photovoltaic power generation. The control method of the photovoltaic power generation system comprises the steps that the surplus of the generated power of the photovoltaic power generation system is monitored, the photovoltaic power generation system comprises one or more photovoltaic assemblies, and each photovoltaic assembly drives one or more photovoltaic direct drive devices; determining the working state of one or more pieces of photovoltaic direct drive equipment in response to the situation that the residual amount of the generated power is greater than a threshold value; and controlling the generated power of at least one photovoltaic module according to the working state of the one or more photovoltaic direct drive devices.

Description

Technical Field

[0001] The present disclosure relates to the technical field of photovoltaic power generation, and in particular to a control method, system and related equipment of a photovoltaic power generation system. Background Art

[0002] Photovoltaic power generation and power consumption systems use the electricity generated by photovoltaic panels to drive user equipment. For example, photovoltaic air conditioning systems use photovoltaic direct drive technology to directly supply the direct current generated by solar panels to air conditioners, reducing losses during energy conversion and improving energy efficiency. With the continuous development of photovoltaic air conditioning technology, photovoltaic air conditioning, as an interface between distributed energy and the power grid, its performance will directly determine the quality of distributed energy generation, and the quality of power generation will affect whether it can be normally connected to the grid. Summary of the invention

[0003] 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 amount of power generation of the photovoltaic power generation system, the photovoltaic power generation system comprising one or more photovoltaic components, each photovoltaic component driving one or more photovoltaic direct-drive devices; in response to the remaining amount of power generation being greater than a threshold, determining a working state of one or more photovoltaic direct-drive devices; and controlling the power generation power of at least one photovoltaic component according to the working state of the one or more photovoltaic direct-drive devices.

[0004] In some embodiments, controlling the power generation power of at least one photovoltaic component based on the working status of one or more photovoltaic direct-drive devices includes: determining a target photovoltaic component from one or more photovoltaic components used to drive an unturned photovoltaic direct-drive device; and reducing the power generation power of the target photovoltaic component.

[0005] In some embodiments, reducing the target photovoltaic component power generation includes: determining a target value according to a difference between a current remaining power generation amount and a threshold value; and reducing the target photovoltaic component power generation, wherein the power generation is reduced by the target value.

[0006] In some embodiments, based on the working status of one or more photovoltaic direct-drive devices, controlling the power generation power of at least one photovoltaic component also includes: after reducing the power generation power of the target photovoltaic component, when the current remaining power generation power of the photovoltaic power generation system is not greater than a threshold, the power generation power of the photovoltaic component used to drive the turned-on photovoltaic direct-drive device remains unchanged.

[0007] In some embodiments, based on the working status of one or more photovoltaic direct-drive devices, controlling the power generation power of at least one photovoltaic component also includes: after reducing the power generation power of the target photovoltaic component, if the current remaining power generation power of the photovoltaic power generation system is still greater than a threshold, reducing the power generation power of the photovoltaic component used to drive the turned-on photovoltaic direct-drive device.

[0008] In some embodiments, reducing the power generation power of a photovoltaic component used to drive a turned-on photovoltaic direct-drive device includes: determining an adjustable range of the first photovoltaic component based on a difference between the power generation power of the first photovoltaic component used to drive the turned-on photovoltaic direct-drive device and the power consumption of the turned-on photovoltaic direct-drive device; and reducing the power generation power of the first photovoltaic component based on the adjustable range.

[0009] In some embodiments, reducing the power generation power of a photovoltaic component used to drive a turned-on photovoltaic direct-drive device also includes: in response to the fact that after reducing the power generation power of a first photovoltaic component, the remaining power generation power of the photovoltaic power generation system is still greater than a threshold, determining a second photovoltaic component from the first photovoltaic component; and reducing the power generation power of the second photovoltaic component.

[0010] In some embodiments, the control method further includes: after controlling the power generation power of at least one photovoltaic component, in response to the remaining power generation power of the photovoltaic power generation system being greater than 0, transmitting the remaining power generation power to the power grid.

[0011] 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 amount of power generation of the photovoltaic power generation system, the photovoltaic power generation system comprising one or more photovoltaic components, each photovoltaic component driving one or more photovoltaic direct-drive devices; a determination module configured to determine the working state of one or more photovoltaic direct-drive devices in response to the remaining amount of power generation being greater than a threshold value; and a control module configured to control the power generation of at least one photovoltaic component according to the working state of the one or more photovoltaic direct-drive devices.

[0012] 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, wherein the processor is configured to execute a control method for the photovoltaic power generation system of any embodiment of the present disclosure based on instructions stored in the memory.

[0013] According to a fourth aspect of some embodiments of the present disclosure, a photovoltaic power generation system is provided, comprising: a control device of the photovoltaic power generation system of any embodiment of the present disclosure; one or more photovoltaic direct-drive devices; and one or more photovoltaic components, each photovoltaic component driving at least one photovoltaic direct-drive device.

[0014] In some embodiments, the photovoltaic power generation system further includes: an electricity acquisition module configured to acquire the power used by the photovoltaic power generation system and send the power used to a control device of the photovoltaic power generation system.

[0015] In some embodiments, one or more photovoltaic direct-drive devices include a master device and one or more slave devices, and a control device of the photovoltaic power generation system is deployed on the master device.

[0016] In some embodiments, the photovoltaic direct drive device is a photovoltaic air conditioner.

[0017] According to a fifth aspect of some embodiments of the present invention, there is provided a computer-readable storage medium having a computer program stored thereon, wherein the program, when executed by a processor, implements any of the aforementioned control methods for a photovoltaic power generation system.

[0018] According to a sixth aspect of some embodiments of the present invention, there is provided a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements any of the aforementioned control methods for a photovoltaic power generation system.

[0019] According to a seventh aspect of some embodiments of the present invention, a computer program product is provided. When the computer program product is executed on a computer, the computer implements any one of the aforementioned control methods for a photovoltaic power generation system.

[0020] Some embodiments of the above invention have the following advantages or beneficial effects. The embodiments of the present disclosure control the power generation of the photovoltaic module by utilizing the working state of the photovoltaic direct drive device, and can consider in advance the influence of controlling the power generation on the photovoltaic direct drive device in different states, thereby being able to reduce losses and improve the power generation efficiency of the photovoltaic power generation system while controlling the remaining power generation of the photovoltaic power generation system.

[0021] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 A schematic structural diagram of a photovoltaic power generation system according to some embodiments of the present disclosure is shown.

[0024] Figure 2 A schematic flow chart of a control method for a photovoltaic power generation system according to some embodiments of the present invention is shown.

[0025] Figure 3 A schematic flow chart of a method for controlling power generation according to some embodiments of the present disclosure is shown.

[0026] Figure 4 A schematic flow chart of a method for controlling power generation according to some embodiments of the present disclosure is shown.

[0027] Figure 5 A schematic flow chart of a control method for a photovoltaic power generation system according to other embodiments of the present disclosure is shown.

[0028] Figure 6 A schematic structural diagram of a control device for a photovoltaic power generation system according to some embodiments of the present disclosure is shown.

[0029] Figure 7 A schematic structural diagram of a photovoltaic air-conditioning system according to some embodiments of the present disclosure is shown.

[0030] Figure 8 The schematic diagrams of the structures of control devices of photovoltaic power generation systems according to other embodiments of the present invention are shown.

[0031] Fig. 9 A schematic structural diagram of a control device for a photovoltaic power generation system according to some further embodiments of the present invention is shown. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] The relative arrangement of components and steps, the numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

[0034] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0035] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0036] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0037] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0038] Since the excess electricity output by the photovoltaic power generation system will cause instability and harmonic pollution when connected to the public power grid, and photovoltaic electricity is undispatched, some areas have relatively high requirements for grid connection, which affects the normal grid connection of photovoltaic air conditioners.

[0039] With the widespread use of distributed photovoltaic power stations, the power systems in some areas can no longer withstand the impact of distributed photovoltaic power stations, and the problems of AC system aging and insufficient capacity have become serious. The power grid company requires that in the self-generation and self-use grid-connected mode, a reverse power protection device should be configured on the user's incoming line side to prevent the power flow changes caused by the reverse power transmission from affecting the upper-level substation.

[0040] Figure 1 The schematic diagram of the structure of the photovoltaic power generation system of some embodiments of the present disclosure is shown. Figure 1 As shown, 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, and each photovoltaic module drives at least one photovoltaic direct drive device. Therefore, the photovoltaic direct drive device can directly use the direct current generated by the photovoltaic module to operate.

[0041] The system 1 may further include one or more AC loads 13 (only one is shown in the figure as an example), and the remaining power generated by the photovoltaic direct-drive device 12 after consumption may be supplied to the AC load 13 .

[0042] Afterwards, if there is still surplus power in the entire system, it can be fed into the AC grid 14 .

[0043] When performing reverse power control on a photovoltaic power generation system, the power generation efficiency of the photovoltaic system itself needs to be taken into consideration. The present disclosure provides a control method for a photovoltaic power generation system to improve the consumption rate of photovoltaic power generation and the power generation efficiency of the photovoltaic system.

[0044] In the embodiments of the present disclosure, the power generation of the photovoltaic module is controlled according to the working state of the photovoltaic direct drive device. Figure 2 An embodiment of a control method of a photovoltaic power generation system of the present disclosure is described.

[0045] Figure 2 FIG. 1 is a flow chart showing a control method for a photovoltaic power generation system according to some embodiments of the present invention. Figure 2 As shown, the control method of the photovoltaic power generation system of this embodiment includes steps S202 to S206.

[0046] In step S202, the remaining amount of power generated by 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 referred to Figure 1 .

[0047] The surplus power refers to the difference between the total power generation and the total power consumption of the photovoltaic power generation system. The surplus power can be determined by monitoring the power generation and power consumption of each device in the photovoltaic power generation system.

[0048] For example, the photovoltaic direct drive device can be distributed, that is, the system can include a main photovoltaic direct drive device and one or more slave photovoltaic direct drive devices. The main photovoltaic direct drive device can obtain the power generation or remaining power generation of the photovoltaic assembly associated with itself (that is, the photovoltaic assembly used to drive the main photovoltaic direct drive device), and the main photovoltaic direct drive device can obtain the power generation or remaining power generation of each slave photovoltaic direct drive device through the communication line (which can be wired or wireless) between the main photovoltaic direct drive device and the slave photovoltaic direct drive device. In addition, other monitoring devices in the system can send the power consumption of other loads (such as AC loads) to the main photovoltaic direct drive device. Thereby, the main photovoltaic direct drive device can calculate the remaining power generation of the photovoltaic power generation system.

[0049] The remaining amount of power generated by the photovoltaic power generation system may be periodically acquired at designated time intervals.

[0050] In step S204, in response to the remaining amount of generated power being greater than a threshold, the operating state of one or more photovoltaic direct-drive devices is determined.

[0051] The threshold is a preset value and can be set as needed. For example, if the power grid does not accept power generation from the photovoltaic power generation system at all, the threshold can be set to 0. If the power grid can properly receive power generation from the photovoltaic power generation system, the threshold can be determined according to the acceptable capacity of the power grid.

[0052] The working state of the PV direct drive device indicates whether the PV direct drive device is turned on. For a PV direct drive device that is not turned on, the power generated by the PV modules associated with it will not be consumed by the PV direct drive device, but will be supplied to other AC loads in the system or fed back to the grid.

[0053] In step S206, the power generation power of at least one photovoltaic assembly is controlled according to the working status of one or more photovoltaic direct-drive devices.

[0054] That is, for photovoltaic direct-drive devices in different working states, the control strategy for driving the photovoltaic components of the photovoltaic direct-drive devices can be determined based on the working state of each photovoltaic direct-drive device, such as whether to control the power generation, how to control the power generation, etc. Based on the control strategy, the power generation of the photovoltaic components is controlled, such as reduced or kept unchanged.

[0055] Since photovoltaic modules directly drive photovoltaic direct-drive devices, the power generated by photovoltaic modules can be directly used for the devices directly driven by them, which can reduce the intermediate conversion of power generation. For example, if photovoltaic direct-drive devices in the startup state need electricity, it is prioritized to ensure that the power generation of these photovoltaic direct-drive devices remains unchanged; if photovoltaic direct-drive devices in the non-startup state do not need electricity, it is prioritized to reduce the power generation of these photovoltaic direct-drive devices.

[0056] The embodiments of the present disclosure control the power generation of the photovoltaic components by utilizing the working state of the photovoltaic direct-drive device, and can consider in advance the impact of controlling the power generation on the photovoltaic direct-drive device in different states, thereby reducing losses and improving the power generation efficiency of the photovoltaic power generation system while controlling the remaining power generation of the photovoltaic power generation system.

[0057] When controlling the power generation of a photovoltaic power generation system, the photovoltaic components corresponding to the photovoltaic direct-drive devices that have not been started can be preferentially reduced. Figure 3 FIG. 1 is a flow chart showing a method for controlling power generation according to some embodiments of the present disclosure. Figure 3 As shown, the control method of this embodiment includes steps S302 to S304.

[0058] In step S302, a target photovoltaic component is determined from one or more photovoltaic components used to drive a photovoltaic direct-drive device that is not turned on.

[0059] The photovoltaic modules corresponding to some or all of the photovoltaic direct-drive devices that are not turned on may be determined as target photovoltaic modules.

[0060] In step S304, the power generation power of the target photovoltaic assembly is reduced.

[0061] The purpose of reducing the power generation is to control the remaining power of the photovoltaic power generation system to below the threshold. Therefore, the target value can be determined first according to the difference between the current remaining power generation and the threshold. The target value can be the difference, or a value determined based on the difference and a preset floating value, so as to achieve more flexible adjustment.

[0062] In some embodiments, the power generation of the target photovoltaic module is reduced, wherein the power generation is reduced by a target value. If there are multiple photovoltaic modules whose power generation is reduced, the sum of the reduced power generation of the multiple photovoltaic modules is equal to the target value. In this way, the remaining power generation of the system can be reduced to below the threshold only by reducing the power generation of the photovoltaic modules corresponding to the unactivated photovoltaic direct-drive devices. Without affecting the power consumption of the activated photovoltaic direct-drive devices, effective control of the power generation of the system is achieved.

[0063] When selecting photovoltaic components, the target value may be allocated to a first number (larger number) of photovoltaic components, or the target value may be allocated more concentratedly to a second number (smaller number) of photovoltaic components, wherein the first number is greater than the second number.

[0064] The above embodiment can control the remaining amount of power generation of the system by reducing the power generation of the photovoltaic modules used to drive the photovoltaic direct drive devices that are not turned on. Since the devices corresponding to these photovoltaic modules are not turned on, the reduction of the power generation of these photovoltaic modules will not affect the operation of the devices in the system and the loss of energy, thereby improving the power generation efficiency.

[0065] The embodiments of the present disclosure can also perform multiple controls on photovoltaic components corresponding to photovoltaic direct-drive devices in different working states.

[0066] In some embodiments, after reducing the power generation power of the target photovoltaic component, if the remaining amount of the current power generation power of the photovoltaic power generation system is not greater than the threshold, the power generation power of the photovoltaic component used to drive the photovoltaic direct-drive device that has been turned on remains unchanged. That is, the power generation power of the photovoltaic component corresponding to the unstarted device is first lowered, and then it is seen whether the threshold requirement can be met after the adjustment. If the adjustment of the photovoltaic component corresponding to the unstarted device can already meet the demand, the power generation power of the photovoltaic component used to drive the photovoltaic direct-drive device that has been turned on remains unchanged. In the case where the threshold requirement can be met only by reducing the power generation power of the photovoltaic component corresponding to the unstarted photovoltaic direct-drive device, this embodiment does not adjust the power generation power of the photovoltaic component used to drive the started photovoltaic direct-drive device. Thereby, without affecting the power consumption of the started photovoltaic direct-drive device, effective control of the power generation power of the system is achieved.

[0067] In some cases, most of the devices in the system are in the activated state, while only a small number of devices are in the inactivated state. In this case, if only the photovoltaic modules used to drive the inactivated devices are controlled, it is difficult to meet the set threshold of the remaining power consumption. In this way, the power generation power of the photovoltaic modules corresponding to the activated devices can be further adjusted. Figure 4 FIG. 1 is a flow chart showing a method for controlling power generation according to some embodiments of the present disclosure. Figure 4 As shown, the control method of this embodiment includes steps S402 to S406.

[0068] In step S402, a target photovoltaic component is determined from one or more photovoltaic components used to drive a photovoltaic direct-drive device that is not turned on.

[0069] In step S404, the power generation power of the target photovoltaic assembly is reduced.

[0070] In step S406, after reducing the power generation power of the target photovoltaic component, if the remaining power generation power of the photovoltaic power generation system is still greater than the threshold, the power generation power of the photovoltaic component used to drive the turned-on photovoltaic direct drive device is reduced.

[0071] The power reduction operations of step S404 and step S406 may be performed sequentially or simultaneously. For example, after step S404 is performed, the remaining amount of power generated by the current system may be monitored again, and then step S406 may be performed. For another example, after determining the power that needs to be reduced for the target photovoltaic module, the power value that needs to be further reduced may be calculated, and then step S404 and step S406 may be performed respectively according to the determined power values, and in any order.

[0072] The above embodiment preferentially adjusts the photovoltaic components used to drive the photovoltaic direct drive devices that are not turned on, and when it is determined that the adjustment cannot meet the demand, the power generation power of the photovoltaic components used to drive the photovoltaic direct drive devices that have been turned on is reduced. In this way, the requirements for the remaining power generation of the system can be met, and the impact on the photovoltaic direct drive devices that have been turned on can be minimized.

[0073] The following describes, by way of example, a method for adjusting the generated power for driving a turned-on photovoltaic direct-drive device.

[0074] In some embodiments, the adjustable interval of the first photovoltaic component is determined according to the difference between the power generation power of the first photovoltaic component used to drive the photovoltaic direct-drive device that has been turned on and the power consumption of the photovoltaic direct-drive device that has been turned on; based on the adjustable interval, the power generation power of the first photovoltaic component is reduced. For example, the difference between the power generation power of the first photovoltaic component and the power consumption of the photovoltaic direct-drive device that has been turned on can be used as the upper limit of the adjustable interval, and the lower limit of the adjustable interval is 0. The reduced value can be selected from this interval. In this way, the power generation power of the adjusted photovoltaic component can be greater than the power consumption of the device it drives, so that the power generation of the adjusted photovoltaic component can still be directly used for the device, reducing the intermediate conversion link of electric energy, reducing losses, and improving the power generation efficiency of the system.

[0075] If this method still cannot meet the system's power generation surplus requirement, the power generation power of the photovoltaic module used to drive the turned-on photovoltaic direct-drive device can continue to be reduced. In some embodiments, in response to the current power generation surplus of the photovoltaic power generation system being greater than the threshold after the power generation power of the first photovoltaic module is reduced, a second photovoltaic module is determined from the first photovoltaic module; the power generation power of the second photovoltaic module is reduced. When reducing the power generation power of the second photovoltaic module, the restriction of the adjustable interval on the adjustment value may no longer be considered. That is, there may be a situation where the power generation power of the photovoltaic module cannot fully meet the use requirements of the device it drives. However, since the device can also be driven based on the power of the power grid or the power of other photovoltaic modules, it will not have too much impact on the normal use of the device. In addition, this method has maximized the direct supply of the electric energy generated by the photovoltaic module to the device it directly drives, so it can also improve the power generation efficiency as much as possible in special scenarios.

[0076] In some embodiments, the above-mentioned various embodiments of the present disclosure may be combined to cope with various situations that may occur. Figure 5 FIG. 2 is a flow chart showing a control method for a photovoltaic power generation system according to other embodiments of the present disclosure. Figure 5 As shown, the control method of this embodiment includes steps S502 to S510.

[0077] In step S502, in response to the remaining amount of generated power being greater than a threshold, the operating state of one or more photovoltaic direct-drive devices is determined.

[0078] In step S504, a target photovoltaic component is determined from one or more photovoltaic components used to drive the photovoltaic direct-drive device that is not turned on, and the power generation power of the target photovoltaic component is reduced.

[0079] Afterwards, in response to the remaining amount of generated power being not greater than the threshold, step S506 is executed; otherwise, step S504 is executed again, or step S508 is executed.

[0080] In step S506, the power generation power of the photovoltaic components used to drive the turned-on photovoltaic direct-drive device remains unchanged.

[0081] In step S508, the adjustable range of the first photovoltaic component is determined according to the difference between the power generation power of the first photovoltaic component used to drive the turned-on photovoltaic direct-drive device and the power consumption of the turned-on photovoltaic direct-drive device, and based on the adjustable range, the power generation power of the first photovoltaic component is reduced.

[0082] Thereafter, in response to the remaining amount of generated power being greater than the threshold, step S510 is executed.

[0083] In step S510, a second photovoltaic assembly is determined from among the first photovoltaic assemblies, and the power generation of the second photovoltaic assembly is reduced.

[0084] Through the above-mentioned embodiments, the photovoltaic components used to drive the photovoltaic direct-drive devices that are not turned on can be preferentially reduced. When the threshold requirement cannot be met, the power generation power of the first photovoltaic component of the photovoltaic direct-drive device that has been turned on can be reduced while ensuring photovoltaic direct drive. When the threshold requirement still cannot be met, the power generation power of the second photovoltaic component of some of the photovoltaic direct-drive devices that have been turned on continues to be reduced. It can be seen that the embodiments of the present disclosure can minimize losses and improve the power generation efficiency of the system while reducing the impact of the photovoltaic power generation system on the power grid.

[0085] 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 power grid. Since the embodiments of the present disclosure can control the remaining power generation so that it does not exceed a preset threshold, the impact of the power generation transmitted to the power grid on the power grid is reduced, and the power consumption rate and power generation efficiency of the photovoltaic power generation system are improved.

[0086] The above describes the methods of various embodiments of the present disclosure. The following describes the apparatus for executing the above methods.

[0087] Figure 6 FIG. 2 shows a schematic diagram of a control device for a photovoltaic power generation system according to some embodiments of the present disclosure. Figure 6As shown, the control device 60 of this embodiment includes: a monitoring module 610, configured to monitor the remaining power generation of the photovoltaic power generation system, the photovoltaic power generation system includes one or more photovoltaic components, each photovoltaic component drives one or more photovoltaic direct-drive devices; a determination module 620, configured to determine the working state of one or more photovoltaic direct-drive devices in response to the remaining power generation being greater than a threshold value; and a control module 630, configured to control the power generation of at least one photovoltaic component according to the working state of one or more photovoltaic direct-drive devices.

[0088] In some embodiments, the control module 630 is further configured to: determine a target photovoltaic component from one or more photovoltaic components used to drive the photovoltaic direct-drive device that is not turned on; and reduce the power generation power of the target photovoltaic component.

[0089] In some embodiments, the control module 630 is further configured to: determine a target value according to a difference between the current remaining amount of generated power and a threshold value; and reduce the generated power of the target photovoltaic module, wherein the generated power is reduced by the target value.

[0090] In some embodiments, the control module 630 is further configured to: after reducing the power generation power of the target photovoltaic component, when the current remaining power generation power of the photovoltaic power generation system is not greater than the threshold, the power generation power of the photovoltaic component used to drive the turned-on photovoltaic direct-drive device remains unchanged.

[0091] In some embodiments, the control module 630 is further configured to: after reducing the power generation power of the target photovoltaic component, if the current remaining power generation power of the photovoltaic power generation system is still greater than the threshold, reduce the power generation power of the photovoltaic component used to drive the turned-on photovoltaic direct-drive device.

[0092] In some embodiments, the control module 630 is further configured to: determine the adjustable range of the first photovoltaic component based on the difference between the power generation power of the first photovoltaic component used to drive the turned-on photovoltaic direct-drive device and the power consumption of the turned-on photovoltaic direct-drive device; and reduce the power generation power of the first photovoltaic component based on the adjustable range.

[0093] In some embodiments, the control module 630 is further configured to: in response to the fact that after reducing the power generation power of the first photovoltaic component, the remaining power generation power of the photovoltaic power generation system is still greater than the threshold, determine the second photovoltaic component from the first photovoltaic component; and reduce the power generation power of the second photovoltaic component.

[0094] In some embodiments, the control device 60 further includes a transmission module 604 configured to: after controlling the power generation of at least one photovoltaic component, in response to the remaining power generation of the photovoltaic power generation system being greater than 0, transmit the remaining power generation to the grid.

[0095] An embodiment of the present disclosure further provides a photovoltaic power generation system, comprising: a control device of the photovoltaic power generation system of any embodiment of the present disclosure; one or more photovoltaic direct-drive devices; and one or more photovoltaic components, each photovoltaic component driving at least one photovoltaic direct-drive device.

[0096] In some embodiments, the photovoltaic power generation system further includes: an electricity acquisition module configured to acquire the power used by the photovoltaic power generation system and send the power used to a control device of the photovoltaic power generation system.

[0097] 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. Therefore, centralized decision-making and control can be performed through the master device, and the existing communication and control mechanism between the master and slave devices can be used to control the power generation.

[0098] In some embodiments, the photovoltaic direct drive device is a photovoltaic air conditioner. Therefore, the solution of the present disclosure can be applied in the photovoltaic air conditioning system to improve the power generation efficiency of the photovoltaic air conditioning system and reduce losses.

[0099] Figure 7 FIG. 2 shows a schematic diagram of the structure of a photovoltaic air conditioning system according to some embodiments of the present disclosure. Figure 7 As shown, the system 7 includes one or more photovoltaic components 71-1, 71-2...71-N, and one or more photovoltaic air conditioners 72-1, 72-2...72-N, and each photovoltaic component drives at least one photovoltaic direct drive device. Thus, the photovoltaic direct drive device can directly use the direct current generated by the photovoltaic component to operate. Photovoltaic air conditioner 72-1 is the host, and photovoltaic air conditioners 71-2...71-N are slaves. Communication lines can be deployed between photovoltaic air conditioners (as shown by dotted lines in the figure). Photovoltaic air conditioner 72-1 is the host and can collect the operating information, working status, and power generation of the photovoltaic components used to drive these slaves, or the remaining power generation, etc. of the slaves. Thus, the slaves and the photovoltaic components corresponding to the slaves can be controlled by the host.

[0100] The system 7 may further include one or more AC loads 73 (only one is shown in the figure as an example), and the remaining power generated by the photovoltaic direct-drive device after consumption may be supplied to the AC load 73 .

[0101] In addition, the system 7 may also include a reverse power control device 74 for acquiring power usage information in the system.

[0102] In the photovoltaic air conditioning system, the remaining electricity is fed into the grid 75.

[0103] Figure 8FIG. 2 shows a schematic diagram of a control device for a photovoltaic power generation system according to some other embodiments of the present invention. Figure 8 As shown, the control device 80 of the photovoltaic power generation system of this embodiment includes: a memory 810 and a processor 820 coupled to the memory 810, and the processor 820 is configured to execute the control method of the photovoltaic power generation system in any of the aforementioned embodiments based on the instructions stored in the memory 810.

[0104] The memory 810 may include, for example, a system memory, a fixed non-volatile storage medium, etc. The system memory may store, for example, an operating system, an application program, a boot loader, and other programs.

[0105] Fig. 9 FIG. 2 shows a schematic diagram of a control device for a photovoltaic power generation system according to some other embodiments of the present invention. Fig. 9 As shown, the control device 90 of the photovoltaic power generation system of 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 the processor 920 may be connected, for example, via a bus 960. Among them, the input / output interface 930 provides a connection interface for input / output devices such as a display, a mouse, a keyboard, and a touch screen. 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.

[0106] An embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon, wherein the program, when executed by a processor, implements any of the aforementioned control methods for a photovoltaic power generation system.

[0107] It should be understood by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable non-transient storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0108] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0109] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0110] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0111] 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 principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A control method for a photovoltaic power generation system, comprising: Monitoring the remaining amount of power generated by a photovoltaic power generation system, wherein the photovoltaic power generation system includes one or more photovoltaic modules, each photovoltaic module driving one or more photovoltaic direct drive devices; In response to the remaining amount of the generated power being greater than a threshold, determining the operating state of the one or more photovoltaic direct-drive devices; The power generation power of at least one photovoltaic component is controlled according to the working status of the one or more photovoltaic direct-drive devices.

2. The control method according to claim 1, wherein: The controlling the power generation power of at least one photovoltaic assembly according to the working state of the one or more photovoltaic direct drive devices comprises: Determining a target photovoltaic component from one or more photovoltaic components used to drive an unactivated photovoltaic direct-drive device; The power generation power of the target photovoltaic module is reduced.

3. The control method according to claim 2, wherein: The reducing the target photovoltaic assembly power generation power comprises: Determining a target value according to a difference between the current remaining amount of generated power and the threshold value; The power generation power of the target photovoltaic assembly is reduced, wherein the power generation power is reduced by the target value.

4. The control method according to claim 2, wherein: The controlling the power generation power of at least one photovoltaic assembly according to the working state of the one or more photovoltaic direct drive devices further comprises: After reducing the power generation power of the target photovoltaic component, when the remaining power generation power of the photovoltaic power generation system is not greater than the threshold, the power generation power of the photovoltaic component used to drive the turned-on photovoltaic direct-drive device remains unchanged.

5. The control method according to claim 2, wherein: The controlling the power generation power of at least one photovoltaic assembly according to the working state of the one or more photovoltaic direct drive devices further comprises: After reducing the power generation power of the target photovoltaic component, if the remaining power generation power of the photovoltaic power generation system is still greater than the threshold, the power generation power of the photovoltaic component used to drive the turned-on photovoltaic direct drive device is reduced.

6. The control method according to claim 5, wherein: The step of reducing the power generation power of the photovoltaic components used to drive the turned-on photovoltaic direct drive device comprises: Determining an adjustable interval of the first photovoltaic component according to a difference between the power generation power of the first photovoltaic component used to drive the turned-on photovoltaic direct-drive device and the power consumption power of the turned-on photovoltaic direct-drive device; Based on the adjustable interval, the power generation power of the first photovoltaic component is reduced.

7. The control method according to claim 6, wherein: The reducing the power generation power of the photovoltaic components used to drive the turned-on photovoltaic direct drive device also includes: In response to the remaining amount of the current power generation of the photovoltaic power generation system still being greater than a threshold after the power generation of the first photovoltaic component is reduced, determining a second photovoltaic component from the first photovoltaic component; The power generation power of the second photovoltaic assembly is reduced.

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

9. A control device for a photovoltaic power generation system, comprising: A monitoring module is configured to monitor the remaining amount of power generated by a photovoltaic power generation system, wherein the photovoltaic power generation system includes one or more photovoltaic modules, each of which drives one or more photovoltaic direct-drive devices; a determination module, configured to determine the working state 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 component according to the working 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, wherein the processor is configured to execute the control method of the photovoltaic power generation system according to any one of claims 1 to 8 based on instructions stored in the memory.

11. A photovoltaic power generation system, comprising: The control device of the 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 drives 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, 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, wherein when the program is executed by a processor, the control method of the photovoltaic power generation system according to any one of claims 1 to 8 is implemented. 16 . A computer program product, when the computer program product is run on a computer, enables the computer to implement the control method of the photovoltaic power generation system according to any one of claims 1 to 8.

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