Photovoltaic power station AGC instruction distribution method and device, AGC system and storage medium

Abstract

The invention relates to the field of photovoltaic power generation, discloses a photovoltaic power station AGC instruction distribution method and device, an AGC system and a storage medium, and aims to improve AGC instruction distribution accuracy. The method comprises the following steps: in response to a received photovoltaic power station AGC instruction, determining the corresponding estimated maximum power generation capacity of each inverter in the photovoltaic power station at the current moment through a plurality of preset power generation capacity evaluation models; obtaining reactive power and alternating-current line voltage of each inverter in the photovoltaic power station at the current moment; based on the reactive power, the AC line voltage, the maximum AC current threshold, the maximum apparent power threshold and the corresponding estimated maximum power generation capacity of each inverter at the current moment, determining the target maximum power generation capacity corresponding to each inverter at the current moment; and performing power distribution based on the AGC instruction of the photovoltaic power station, the minimum adjustable power threshold value corresponding to each inverter and the target maximum power generation capacity corresponding to each inverter at the current moment to obtain a power instruction distributed to each inverter at the current moment.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic power generation technology, and in particular to a method and device for allocating AGC instructions of a photovoltaic power station, an AGC system and a storage medium. Background Art

[0002] Automatic Generation Control (AGC) is one of the paid auxiliary services provided by grid-connected power plants. Within the prescribed output adjustment range, the generator sets track the instructions issued by the power dispatching and trading agency, and adjust the power generation output in real time at a certain adjustment rate to meet the power system frequency and interconnection line power control requirements.

[0003] After receiving the PV power station AGC instruction issued by the dispatcher, the PV power station needs to distribute the whole station power instruction carried in the PV power station AGC instruction to each array. After each array receives the corresponding array AGC instruction, it needs to distribute the corresponding array AGC instruction to each inverter under the array. If the inverter AGC instruction is not distributed reasonably, some inverters will still have power generation capacity, but the inverter AGC instruction will not fully utilize the inverter's power generation capacity; some inverters have reached the maximum power generation capacity, but the inverter AGC instruction exceeds the inverter's maximum power generation capacity, resulting in a loss of power generation. Summary of the invention

[0004] The present application provides a method, device, AGC system and storage medium for allocating AGC instructions of a photovoltaic power station, which are used to determine the estimated maximum power generation capacity of each inverter through a preset power generation capacity evaluation model, and correct the estimated maximum power generation capacity of each inverter through reactive power and AC line voltage to obtain a corrected target maximum power generation capacity, and allocate the AGC instructions of the photovoltaic power station according to the target maximum power generation capacity corresponding to each inverter, thereby solving the problem of unreasonable AGC instruction allocation of the photovoltaic power station due to different maximum power generation capacities of inverters, thereby causing power generation loss, and achieving the effect of improving the accuracy of AGC instruction allocation of the photovoltaic power station and reducing the power loss in the process of AGC instruction allocation of the photovoltaic power station.

[0005] A first aspect of an embodiment of the present application provides a method for allocating AGC instructions of a photovoltaic power station, wherein the photovoltaic power station includes multiple inverters, and the method for allocating AGC instructions of the photovoltaic power station includes: in response to a received AGC instruction of the photovoltaic power station, determining the estimated maximum power generation capacity corresponding to each inverter in the photovoltaic power station at the current moment through multiple preset power generation capacity evaluation models; obtaining the reactive power of each inverter in the photovoltaic power station at the current moment and the AC line voltage of each inverter at the current moment; determining the target maximum power generation capacity corresponding to each inverter at the current moment based on the reactive power of each inverter at the current moment, the AC line voltage of each inverter at the current moment, the maximum AC current threshold corresponding to each inverter, the maximum apparent power threshold corresponding to each inverter, and the estimated maximum power generation capacity corresponding to each inverter at the current moment; performing power allocation based on the AGC instruction of the photovoltaic power station, the minimum adjustable power threshold corresponding to each inverter, and the target maximum power generation capacity corresponding to each inverter at the current moment, to obtain the power instruction allocated to each inverter at the current moment.

[0006] A second aspect of an embodiment of the present application provides a device for distributing AGC instructions of a photovoltaic power station. The photovoltaic power station includes multiple inverters. The device for distributing AGC instructions of the photovoltaic power station includes: a first determination module, which is used to respond to the received photovoltaic power station AGC instructions and determine the estimated maximum power generation capacity corresponding to each inverter in the photovoltaic power station at the current moment through multiple preset power generation capacity evaluation models; an acquisition module, which is used to obtain the reactive power of each inverter in the photovoltaic power station at the current moment and the AC line voltage of each inverter at the current moment; a second determination module, which is used to determine the target maximum power generation capacity corresponding to each inverter at the current moment based on the reactive power of each inverter at the current moment, the AC line voltage of each inverter at the current moment, the maximum AC current threshold corresponding to each inverter, the maximum apparent power threshold corresponding to each inverter, and the estimated maximum power generation capacity corresponding to each inverter at the current moment; and an allocation module, which is used to perform power allocation based on the photovoltaic power station AGC instructions, the minimum adjustable power threshold corresponding to each inverter, and the target maximum power generation capacity corresponding to each inverter at the current moment, so as to obtain the power instructions allocated to each inverter at the current moment.

[0007] A third aspect of an embodiment of the present application provides an AGC system, the AGC system comprising: a memory and at least one processor, the memory storing instructions; at least one processor calling the instructions in the memory so that the AGC system executes the photovoltaic power station AGC instruction allocation method of the first aspect above.

[0008] A fourth aspect of the present application provides a computer-readable storage medium, in which instructions are stored. When the computer-readable storage medium is run on a computer, the computer executes the above-mentioned method for distributing AGC instructions of a photovoltaic power station.

[0009] In the technical solution provided by the present application, in response to the received AGC instruction of the photovoltaic power station, the estimated maximum power generation capacity corresponding to each inverter in the photovoltaic power station at the current moment is determined through multiple preset power generation capacity evaluation models; the reactive power of each inverter in the photovoltaic power station at the current moment and the AC line voltage of each inverter at the current moment are obtained; based on the reactive power of each inverter at the current moment, the AC line voltage of each inverter at the current moment, the maximum AC current threshold corresponding to each inverter, the maximum apparent power threshold corresponding to each inverter and the estimated maximum power generation capacity corresponding to each inverter at the current moment, the target maximum power generation capacity corresponding to each inverter at the current moment is determined; power allocation is performed based on the AGC instruction of the photovoltaic power station, the minimum adjustable power threshold corresponding to each inverter and the target maximum power generation capacity corresponding to each inverter at the current moment, so as to obtain the power instruction allocated to each inverter at the current moment. In the embodiment of the present application, the estimated maximum power generation capacity of each inverter is determined through a preset power generation capacity evaluation model, and the estimated maximum power generation capacity of each inverter is corrected by reactive power and AC line voltage to obtain the corrected target maximum power generation capacity, and the AGC instructions of the photovoltaic power station are allocated according to the target maximum power generation capacity corresponding to each inverter, thereby solving the problem of unreasonable AGC instruction allocation of the photovoltaic power station due to different maximum power generation capacities of the inverters, which in turn causes power generation loss, and achieves the effect of improving the accuracy of AGC instruction allocation of the photovoltaic power station and reducing the power loss in the process of AGC instruction allocation of the photovoltaic power station. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 A schematic diagram of an embodiment of a method for distributing AGC instructions of a photovoltaic power station in an embodiment of the present application;

[0011] Figure 2 This is another schematic diagram of an embodiment of a method for distributing AGC instructions of a photovoltaic power station in an embodiment of the present application;

[0012] Figure 3 This is another schematic diagram of an embodiment of a method for distributing AGC instructions of a photovoltaic power station in an embodiment of the present application;

[0013] Figure 4 This is another schematic diagram of an embodiment of a method for distributing AGC instructions of a photovoltaic power station in an embodiment of the present application;

[0014] Figure 5 A schematic diagram of a distribution device for AGC instructions of a photovoltaic power station in an embodiment of the present application;

[0015] Figure 6 A schematic diagram of the AGC system in an embodiment of the present application. DETAILED DESCRIPTION

[0016] The present application provides a method, device, AGC system and storage medium for allocating AGC instructions of a photovoltaic power station, which are used to determine the estimated maximum power generation capacity of each inverter through a preset power generation capacity evaluation model, and correct the estimated maximum power generation capacity of each inverter through reactive power and AC line voltage to obtain a corrected target maximum power generation capacity, and allocate AGC instructions according to the target maximum power generation capacity corresponding to each inverter, thereby solving the problem of unreasonable AGC instruction allocation due to different maximum power generation capacities of inverters in photovoltaic power stations, thereby causing power generation loss, and achieving the effect of improving the accuracy of AGC instruction allocation and reducing power loss in the AGC instruction allocation process of photovoltaic power stations.

[0017] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0018] See also Figure 1 , a flow chart of a method for distributing AGC instructions of a photovoltaic power station provided in an embodiment of the present application, the method for distributing AGC instructions of a photovoltaic power station specifically includes:

[0019] 101. In response to a received AGC instruction of a photovoltaic power station, an estimated maximum power generation capacity corresponding to each inverter in the photovoltaic power station at a current moment is determined by using a plurality of preset power generation capacity evaluation models.

[0020] A photovoltaic power station includes multiple photovoltaic arrays, which are referred to as arrays in the embodiments of this application. Each array includes multiple inverters. The execution subject of this application can be a distribution device for AGC instructions of the photovoltaic power station, or it can be an AGC system or other control device in the photovoltaic power station. For ease of understanding, the AGC system is used as the execution subject in this embodiment and subsequent embodiments, and will not be repeated in subsequent embodiments.

[0021] After receiving the AGC instruction of the photovoltaic power station issued by the scheduling system, the AGC system responds to the received AGC instruction of the photovoltaic power station and determines the estimated maximum power generation capacity corresponding to each inverter at the current moment through the power generation capacity evaluation model corresponding to each inverter in the photovoltaic power station, wherein the power generation capacity evaluation model is preset.

[0022] It should be noted that the power generation capacity evaluation model is trained based on the historical active power data of the corresponding inverter. It can be prepared to reflect the corresponding inverter at the current moment. According to the position of the corresponding inverter in the photovoltaic power station, the horizontal plane irradiance, solar altitude angle, solar azimuth angle, and component temperature at the current moment are determined. The horizontal plane irradiance, solar altitude angle, solar azimuth angle, and component temperature at the current moment are used as input parameters to calculate the estimated maximum power generation capacity of the corresponding inverter at the current moment. The maximum power generation capacity refers to the maximum value of the active power that the inverter can generate.

[0023] 102. Obtain the reactive power of each inverter in the photovoltaic power station at the current moment and the AC line voltage of each inverter at the current moment.

[0024] The AGC system obtains the reactive power of each inverter in the photovoltaic power station at the current moment and the AC line voltage of each inverter at the current moment.

[0025] It should be noted that the embodiment of the present application needs to correct the estimated maximum power generation capacity corresponding to each inverter at the current moment. Therefore, it is necessary to obtain reactive power and AC line voltage, that is, to calculate the actual power of each inverter at the current moment through reactive power and AC line voltage.

[0026] It is understandable that when calculating the actual power, the maximum AC current threshold of each inverter is also needed, and the maximum AC current threshold is a preset value. Among them, the reactive power, AC line voltage, and maximum AC current threshold corresponding to each inverter can be the same or different. For example, the maximum AC current threshold corresponding to the same model of inverter is the same, and the maximum AC current threshold corresponding to different models of inverter is different. Because the square array contains multiple inverters, there may be multiple models of inverters, which are not limited here.

[0027] 103. Determine the target maximum power generation capacity of each inverter at the current moment based on the reactive power of each inverter at the current moment, the AC line voltage of each inverter at the current moment, the maximum AC current threshold corresponding to each inverter, the maximum apparent power threshold corresponding to each inverter and the estimated maximum power generation capacity of each inverter at the current moment.

[0028] The AGC system determines the target maximum power generation capacity of each inverter at the current moment based on the reactive power of each inverter at the current moment, the AC line voltage of each inverter at the current moment, the maximum AC current threshold corresponding to each inverter, the maximum apparent power threshold corresponding to each inverter and the estimated maximum power generation capacity of each inverter at the current moment.

[0029] It should be noted that the actual power calculation value of each inverter is first calculated through the reactive power of each inverter at the current moment, the AC line voltage of each inverter at the current moment, and the maximum AC current threshold corresponding to each inverter. Then, the maximum apparent power that can be generated by each inverter is determined according to the actual power calculation value of each inverter and the maximum apparent power threshold corresponding to each inverter. The square root of the difference between the square of the maximum apparent power that can be generated and the reactive power of each inverter is taken to obtain the maximum value of the active power that can be generated by each inverter. Finally, the maximum value of the active power that can be generated by each inverter is compared with the estimated maximum power generation capacity of the inverter to determine the target maximum power generation capacity corresponding to each inverter at the current moment.

[0030] 104. Power is allocated based on the AGC instruction of the photovoltaic power station, the minimum adjustable power threshold corresponding to each inverter, and the target maximum power generation capacity corresponding to each inverter at the current moment, to obtain the power instruction allocated to each inverter at the current moment.

[0031] The AGC system allocates power based on the AGC instructions of the photovoltaic power station, the minimum adjustable power threshold corresponding to each inverter, and the target maximum power generation capacity corresponding to each inverter at the current moment, and obtains the power instructions allocated to each inverter at the current moment. Among them, the minimum adjustable power threshold corresponding to each inverter is a preset value and can be used directly.

[0032] It should be understood that the allocated power instruction is sent to each inverter in the form of an AGC instruction, which will not be described in detail in this embodiment and subsequent embodiments. The content of the AGC instruction includes the allocated power adjustment value (i.e., the power amplitude to be adjusted) and the active power at the current moment. The embodiment of the present application and subsequent embodiments do not limit the content of the AGC instruction.

[0033] By determining the exact value of the maximum power generation capacity corresponding to each inverter, that is, the target maximum power generation capacity, and then allocating the corresponding power command to each inverter according to its target maximum power generation capacity, the maximum power generation capacity of each inverter can be fully utilized to avoid the allocated power command exceeding the maximum power generation capacity of the inverter, or failing to reach the maximum power generation capacity of the inverter, resulting in power loss (the actual power does not reach the power command), resulting in poor AGC regulation accuracy. The power command includes the actual power and the power regulation value.

[0034] In the embodiment of the present application, the estimated maximum power generation capacity of each inverter is determined through a preset power generation capacity evaluation model, and the estimated maximum power generation capacity of each inverter is corrected by reactive power and AC line voltage to obtain the corrected target maximum power generation capacity, and the AGC instructions of the photovoltaic power station are allocated according to the target maximum power generation capacity corresponding to each inverter, thereby solving the problem of unreasonable AGC instruction allocation of the photovoltaic power station due to different maximum power generation capacities of the inverters, which in turn causes power generation loss, and achieves the effect of improving the accuracy of AGC instruction allocation of the photovoltaic power station and reducing the power loss in the process of AGC instruction allocation of the photovoltaic power station.

[0035] See also Figure 2 , another flow chart of the method for allocating AGC instructions of a photovoltaic power station provided in an embodiment of the present application, the method for allocating AGC instructions of a photovoltaic power station specifically includes:

[0036] 201. In response to a received AGC instruction of a photovoltaic power station, determine an estimated maximum power generation capacity corresponding to each inverter in the photovoltaic power station at a current moment through a plurality of preset power generation capacity evaluation models.

[0037] Specifically, in response to the received AGC instruction of the photovoltaic power station, the AGC system obtains the horizontal plane irradiance, solar altitude angle, solar azimuth angle and component temperature of each inverter in the photovoltaic power station at the current moment; the AGC system inputs the horizontal plane irradiance, solar altitude angle, solar azimuth angle and component temperature of each inverter at the current moment into the power generation capacity evaluation model corresponding to each inverter, and obtains the active power of each inverter at the current moment; the AGC system determines the active power of each inverter at the current moment as the estimated maximum power generation capacity of each inverter at the current moment.

[0038] It should be noted that each inverter corresponds to a power generation capacity evaluation model, and different power generation capacity evaluation models have different specific parameters.

[0039] 202. Obtain reactive power of each inverter in the photovoltaic power station at the current moment and AC line voltage of each inverter at the current moment.

[0040] Steps 201-202 are similar to steps 101-102 and will not be repeated here.

[0041] 203. Determine the target maximum power generation capacity corresponding to each inverter at the current moment based on the reactive power of each inverter at the current moment, the AC line voltage of each inverter at the current moment, the maximum AC current threshold corresponding to each inverter, the maximum apparent power threshold corresponding to each inverter and the estimated maximum power generation capacity corresponding to each inverter at the current moment.

[0042] Specifically, the AGC system calculates the product of a preset power factor, the AC line voltage of each inverter at the current moment, and the maximum AC current threshold corresponding to each inverter, to obtain the actual power calculation value of each inverter; the AGC system takes the smaller value between the actual power calculation value of each inverter and the maximum apparent power threshold corresponding to each inverter, to obtain the maximum apparent power that can be generated by each inverter; the AGC system determines the maximum value of the active power that can be generated by each inverter based on the maximum apparent power that can be generated by each inverter and the reactive power of each inverter at the current moment; the AGC system takes the smaller value between the maximum value of the active power that can be generated by each inverter and the maximum power generation capacity corresponding to each inverter at the current moment, to obtain the target maximum power generation capacity corresponding to each inverter at the current moment.

[0043] For example, the actual power calculation value can be expressed as S j =K×U×I max , where K is the power coefficient, for example, it can be S j Indicates the actual power calculation value, U indicates the AC line voltage, I max Indicates the maximum AC current threshold. The actual power calculation value and the maximum apparent power threshold S max Compare and take the smaller value as the maximum apparent power S that can be generated, S = min (S j ,S max ), where S j Indicates the actual power calculation value, S max Indicates the maximum apparent power threshold of the inverter, and min() indicates the minimum value.

[0044] For another example, the process of taking the square root of the square difference between the maximum apparent power S and reactive power Q that can be generated by each inverter can be expressed as: Among them, S is the maximum apparent power that can be generated, Q is the reactive power, P max Indicates the maximum value of the active power that can be generated. The maximum value of the active power that can be generated must also be compared with the estimated maximum power generation capacity of the inverter. If the maximum value of the active power that can be generated is less than the estimated maximum power generation capacity of the inverter, the target maximum power generation capacity of the inverter is determined to be equal to the maximum value of the active power that can be generated. If the maximum value of the active power that can be generated is greater than or equal to the estimated maximum power generation capacity of the inverter, the target maximum power generation capacity of the inverter is determined to be equal to the estimated maximum power generation capacity.

[0045] 204. Determine the downward adjustable capacity corresponding to each inverter, the upward adjustable capacity corresponding to each inverter, the downward adjustable capacity corresponding to each array, and the upward adjustable capacity corresponding to each array based on the minimum adjustable power threshold corresponding to each inverter and the target maximum power generation capacity corresponding to each inverter at the current moment.

[0046] Specifically, the AGC system obtains the active power of each inverter and the active power of each array at the current moment; the AGC system subtracts the minimum adjustable power threshold corresponding to each inverter from the active power of each inverter at the current moment, and obtains the downward adjustable capacity corresponding to each inverter; the AGC system subtracts the sum of the minimum adjustable power thresholds corresponding to each inverter in the corresponding array from the active power of each array at the current moment, and obtains the downward adjustable capacity corresponding to each array; the AGC system subtracts the active power of each inverter at the current moment from the target maximum power generation capacity corresponding to each inverter at the current moment, and obtains the upward adjustable capacity corresponding to each inverter; the AGC system subtracts the active power of the corresponding array at the current moment from the sum of the target maximum power generation capacity corresponding to each inverter in each array at the current moment, and obtains the upward adjustable capacity corresponding to each array.

[0047] It should be noted that the inverters acquired by the AGC system in this embodiment refer to inverters with normal communication, AGC regulation function and no faults. Therefore, the inverters in each array are in normal state. The maximum power generation capacity of all inverters in the array under normal state is summed to obtain the maximum power generation capacity of the array. The minimum adjustable power threshold (i.e., minimum power generation capacity) of all inverters in normal state in the array is summed to obtain the minimum power generation capacity of the array. Among them, the minimum adjustable power threshold of each inverter is preset and has nothing to do with the time.

[0048] It is understandable that the downward adjustable capacity and upward adjustable capacity corresponding to each inverter may be determined first, and then the downward adjustable capacity and upward adjustable capacity corresponding to each array may be determined. The specific determination order is not limited.

[0049] 205. Determine the power instruction assigned to each inverter at the current moment based on the AGC instruction of the photovoltaic power station, the downward adjustable capacity corresponding to each inverter, the upward adjustable capacity corresponding to each inverter, the downward adjustable capacity corresponding to each array, and the upward adjustable capacity corresponding to each array.

[0050] In a feasible implementation, it specifically includes: the AGC system parses the AGC instruction of the photovoltaic power station to obtain the total station power generation power required to be provided by the photovoltaic power station; the AGC system obtains the active power of the photovoltaic power station at the grid connection point and the active power of each inverter at the current moment; when the total station power generation power is less than the active power of the grid connection point at the current moment, the AGC system determines the downward adjustment amount of each array at the current moment according to the first difference and the first ratio, the first difference is the difference between the active power of the grid connection point and the total station power generation power, and the first ratio is the ratio of the downward adjustable capacity corresponding to each array to the sum of the downward adjustable capacities corresponding to each array; the AGC system determines the downward power adjustment value assigned to each inverter at the current moment based on the downward adjustment amount of each array at the current moment, the downward adjustable capacity corresponding to each inverter and the sum of the downward adjustable capacities corresponding to each inverter, and generates the power instruction assigned to each inverter at the current moment, the power instruction including the downward power adjustment value and the active power at the current moment.

[0051] Among them, each array is equipped with a digital collection device, and the downward adjustment amount of each array at the current moment will be sent from the AGC system to the digital collection device corresponding to each array. For example, the difference between the active power of the grid-connected point and the total station power generation power indicated by the AGC instruction is first calculated according to the downward adjustment capacity of the array to obtain the downward adjustment amount of each array, and allocated to the digital collection device of each array; then the downward adjustment amount of each array is used to determine the downward power adjustment value of each inverter according to the downward adjustment capacity of the inverter, and allocated to the corresponding inverter.

[0052] Then the downward adjustment amount (downward power adjustment value) allocated to the digital acquisition device of each array is: Among them, n represents the serial number of the square matrix, ΔP n_down represents the downward adjustment amount of the nth matrix, P s Indicates the active power of the grid connection point, P ALL It represents the total station power generation. represents the sum of the downward adjustable capabilities of n square matrices, P n_down represents the downward adjustable capacity of the nth array, k represents the loss coefficient, which is the equipment loss rate from the inverter to the grid connection point, and the loss coefficient includes the power consumed by the station. n_down =P n -P n_min , n represents the serial number of the square matrix, P n Represents the active power of the nth matrix, P n_min Represents the minimum power generation capacity corresponding to the nth matrix.

[0053] Then the downward adjustment amount (downward adjustment power value) allocated to the inverters of each array is:

[0054] Where n is the serial number of the matrix, m is the serial number of the inverter, ΔP n_down represents the downward adjustment amount of the nth matrix, It represents the sum of the downward adjustable capabilities of m inverters in n arrays, P n_down,m Indicates the downward adjustable capability of the mth inverter in the nth array, ΔP n_down,m It indicates the downward power adjustment value (ie, downward adjustment amount) allocated to the mth inverter in the nth array.

[0055] In this embodiment, the power generation power of the entire station indicated by the AGC instruction of the photovoltaic power station is less than the active power of the grid connection point at the current moment, which means that the entire station has entered a power-limited state and the power generation power of each inverter in the photovoltaic power station needs to be adjusted downward. It should also be noted that the power instruction assigned to each inverter at the current moment includes the power size that each inverter needs to reduce and the active power at the current moment.

[0056] In a feasible implementation, it specifically includes: the AGC system analyzes the AGC instruction of the photovoltaic power station to obtain the total power generation power required by the photovoltaic power station; the AGC system obtains the active power of the photovoltaic power station at the grid connection point at the current moment and the active power of each inverter at the current moment; when the total power generation power of the station is greater than the active power of the grid connection point at the current moment, and is less than the product of the preset coefficient and the sum of the target maximum power generation capacity corresponding to all arrays at the current moment, the AGC system determines the upward adjustment amount of each array at the current moment according to the second difference and the second ratio. The second difference is the difference between the total station power generation and the active power of the grid-connected point, and the second ratio is the ratio of the upward adjustable capacity corresponding to each array to the sum of the upward adjustable capacities corresponding to each array; the AGC system determines the upward power adjustment value assigned to each inverter at the current moment based on the upward adjustment amount of each array at the current moment, the upward adjustable capacity corresponding to each inverter and the sum of the upward adjustable capacities corresponding to each inverter, and generates a power instruction assigned to each inverter at the current moment, the power instruction including the upward power adjustment value and the active power at the current moment.

[0057] Among them, each array is equipped with a digital collection device, and the upward adjustment amount of each array at the current moment will be sent from the AGC system to the digital collection device corresponding to each array. For example, the difference between the total station power generation indicated by the AGC instruction and the active power of the grid-connected point is first calculated according to the upward adjustable capacity of the array to obtain the upward adjustment amount of each array, and distributed to the digital collection device of each array. Then, the upward adjustment amount of each array is distributed to each inverter in the form of an upward power adjustment value according to the upward adjustable capacity of the inverter.

[0058] Then the upward adjustment amount (upward power adjustment value) allocated to the digital acquisition device of each array is: Among them, n represents the serial number of the square matrix, ΔP n_up represents the upward adjustment of the nth matrix, P s Indicates the active power of the grid connection point, P ALL It represents the total station power generation. represents the sum of the upward adjustable capabilities of n square matrices, P n_up represents the upward adjustable capacity of the nth array, k represents the loss coefficient, which is the equipment loss rate from the inverter to the grid connection point, and the loss coefficient includes the power consumed by the station. n_up =P n_max -P n , n represents the serial number of the square matrix, P n Represents the active power of the nth matrix, P n_max Indicates the maximum power generation capacity corresponding to the nth matrix.

[0059] Then the upward adjustment amount (upward adjustment power value) allocated to the inverters of each array is:

[0060] Where n is the serial number of the matrix, m is the serial number of the inverter, ΔP n_up represents the upward adjustment amount of the nth matrix, represents the sum of the upward adjustable capabilities of m inverters in n arrays, P n_up,m represents the upward adjustable capability of the mth inverter in the nth array, ΔP n_up,m It indicates the upward power adjustment value (ie, upward adjustment amount) allocated to the mth inverter in the nth array.

[0061] In this implementation, the total power generation power indicated by the AGC instruction of the photovoltaic power station is greater than the active power of the grid connection point at the current moment, and is still less than the product of the preset coefficient and the sum of the target maximum power generation capacity corresponding to all arrays at the current moment. The preset coefficient is (1-k), k represents the loss coefficient, and the product can be expressed as It means that the whole station increases the power generation under the power-limited state, and the power generation power of each inverter in the PV power station needs to be adjusted upward.

[0062] It should also be noted that the power instruction allocated to each inverter at the current moment includes the power size that each inverter needs to increase and the active power at the current moment.

[0063] In a feasible implementation, it specifically includes: the AGC system parses the AGC instructions of the photovoltaic power station to obtain the total station power generation power required to be provided by the photovoltaic power station; the AGC system obtains the active power of the photovoltaic power station at the grid-connected point at the current moment and the active power of each inverter at the current moment; when the total station power generation power is greater than the product of the preset coefficient and the sum of the target maximum power generation capacity corresponding to all arrays at the current moment, the AGC system determines the power instruction assigned to each inverter at the current moment, the power instruction includes an upward power adjustment value and the active power at the current moment, and the upward power adjustment value is the difference between the maximum power threshold of the inverter and the active power at the current moment.

[0064] It should be noted that the total power generation of the photovoltaic power station indicated by the AGC instruction is greater than the product of the preset coefficient and the sum of the target maximum power generation capacity of all arrays at the current moment. The preset coefficient is (1-k), k represents the loss coefficient, and the product can be expressed as It means that the whole station has exited the power restriction state, and the power commands of all inverters are set to the maximum power threshold of the inverter to ensure that the inverter is not power restricted. The upward adjustment amount at this time is the difference between the maximum power threshold of the inverter and the active power.

[0065] In the embodiment of the present application, the estimated maximum power generation capacity of each inverter is determined through a preset power generation capacity evaluation model, and the estimated maximum power generation capacity of each inverter is corrected by reactive power and AC line voltage to obtain the corrected target maximum power generation capacity, and the AGC instructions of the photovoltaic power station are allocated according to the target maximum power generation capacity corresponding to each inverter. According to the size of the power generation power of the entire station in the AGC instructions of the photovoltaic power station, different calculation methods are used to determine the power instructions corresponding to each inverter, which solves the problem of unreasonable AGC instruction allocation of the photovoltaic power station due to different maximum power generation capacities of the inverters, thereby causing power generation loss, and achieves the effect of improving the accuracy of AGC instruction allocation of the photovoltaic power station and reducing the power loss in the AGC instruction allocation process of the photovoltaic power station.

[0066] See also Figure 3 , another flow chart of the method for distributing AGC instructions of a photovoltaic power station provided in an embodiment of the present application, the method for distributing AGC instructions of a photovoltaic power station specifically includes:

[0067] 301. In response to a received AGC instruction of a photovoltaic power station, an estimated maximum power generation capacity corresponding to each inverter in the photovoltaic power station at a current moment is determined by using a plurality of preset power generation capacity evaluation models.

[0068] 302. Obtain reactive power of each inverter in the photovoltaic power station at the current moment and AC line voltage of each inverter at the current moment.

[0069] 303. Determine the target maximum power generation capacity corresponding to each inverter at the current moment based on the reactive power of each inverter at the current moment, the AC line voltage of each inverter at the current moment, the maximum AC current threshold corresponding to each inverter, the maximum apparent power threshold corresponding to each inverter and the estimated maximum power generation capacity corresponding to each inverter at the current moment.

[0070] 304. Determine the downward adjustable capacity corresponding to each inverter, the upward adjustable capacity corresponding to each inverter, the downward adjustable capacity corresponding to each array, and the upward adjustable capacity corresponding to each array based on the minimum adjustable power threshold corresponding to each inverter and the target maximum power generation capacity corresponding to each inverter at the current moment.

[0071] 305. Determine the power instruction assigned to each inverter at the current moment based on the AGC instruction of the photovoltaic power station, the downward adjustable capacity corresponding to each inverter, the upward adjustable capacity corresponding to each inverter, the downward adjustable capacity corresponding to each array, and the upward adjustable capacity corresponding to each array.

[0072] Steps 301-305 are similar to steps 201-205 and are not described again here.

[0073] 306. When the actual power of any target inverter is less than a preset multiple of the allocated power command, the power command corresponding to the target inverter is adjusted to the actual power and the power difference to be increased is determined, where the power difference to be increased is the difference between the allocated power command and the actual power of the target inverter.

[0074] After the AGC system completes the AGC command allocation of a photovoltaic power station, if any target inverter changes its power due to an emergency (for example, a fault or maintenance, etc.), it fails to complete the a multiple of the allocated power command, where a is a constant value less than 1, for example, 0.9. Assuming that the power of inverter A in array 1 is the power command ΔP n_up,m 0.8 times of ΔP, then the power command (i.e., the allocated power) of inverter A is adjusted down to 0.8×ΔP n_up,m (i.e. actual power), then there will be 0.2×ΔP remaining n_up,m The power difference to be adjusted up.

[0075] 307. Determine a plurality of upward-adjusting inverters that belong to the same array as the target inverter, where the upward-adjusting inverters are inverters that participate in the allocation of the power difference to be upward-adjusted.

[0076] The AGC system determines multiple upward-adjusting inverters that belong to the same array as the target inverter. The upward-adjusting inverter is the inverter that participates in the allocation of the power difference to be increased. For example, because inverter A belongs to array No. 1, the remaining power difference to be increased of inverter A is shared by other upward-adjusting inverters in array No. 1. The upward-adjusting inverter refers to the inverter that is capable of sharing.

[0077] 308. Determine a power increase value of each upward inverter according to the power difference to be allocated, the upward adjustable capability of each upward inverter, and the sum of the upward adjustable capabilities of each upward inverter.

[0078] The AGC system determines the power increase value of each upward inverter according to the power difference to be allocated, the upward adjustable capacity of each upward inverter, and the sum of the upward adjustable capacity of each upward inverter. For example, for the square array to which the target inverter belongs, assuming that the square array contains (l+1) inverters, after the target inverter has not completed the allocated power instruction, the remaining l inverters all participate in the power increase, then there are l upward inverters, and the power increase value of each upward inverter is ΔP up,l Indicates the increase value of each increase inverter, P Δup Indicates the remaining power difference to be increased in the target inverter. The sum of the upward adjustable capabilities of the l upward-regulating inverters involved in power upward regulation, ΔP up,l Indicates the upward adjustable capability of the lth upward inverter.

[0079] 309. Adjust the power instructions assigned to each upward-regulated inverter based on the power upward-regulated value of each upward-regulated inverter to obtain the upward-regulated power instructions corresponding to each upward-regulated inverter.

[0080] The AGC system adjusts the power instructions assigned to each upward-regulated inverter based on the power upward-regulated value of each upward-regulated inverter, and obtains the upward-regulated power instructions corresponding to each upward-regulated inverter.

[0081] In this embodiment, the unused power instructions of any target inverter are shared to other inverters in the same array that can participate in the increase, completing the secondary distribution of the unused AGC instructions, and ensuring that the full station power generation power of each photovoltaic power station AGC instruction can be completely distributed to each inverter.

[0082] In the embodiment of the present application, the estimated maximum power generation capacity of each inverter is determined by a preset power generation capacity evaluation model, and the estimated maximum power generation capacity of each inverter is corrected by reactive power and AC line voltage to obtain the corrected target maximum power generation capacity, and the AGC instructions of the photovoltaic power station are allocated according to the target maximum power generation capacity corresponding to each inverter. According to the size of the power generation power of the entire station in the AGC instructions of the photovoltaic power station, different calculation methods are used to determine the power instructions corresponding to each inverter, which solves the problem of unreasonable AGC instruction allocation of the photovoltaic power station due to different maximum power generation capacities of the inverters, thereby causing power generation loss, and achieves the effect of improving the accuracy of AGC instruction allocation of the photovoltaic power station and reducing the power loss in the AGC instruction allocation process of the photovoltaic power station; at the same time, after one adjustment is completed, the unused power instructions are redistributed, which reduces the power loss in the adjustment process and improves the utilization rate of the AGC instructions of the photovoltaic power station.

[0083] See also Figure 4 , another flow chart of the method for allocating AGC instructions of a photovoltaic power station provided in an embodiment of the present application, the method for allocating AGC instructions of a photovoltaic power station specifically includes:

[0084] 401. Acquire the longitude and latitude data of the photovoltaic power station, and calculate the solar altitude angle and the solar azimuth angle of the photovoltaic power station at each moment based on the longitude and latitude data of the photovoltaic power station.

[0085] The AGC system obtains the longitude and latitude data of the photovoltaic power station, and calculates the solar altitude angle and solar azimuth angle of the photovoltaic power station at each moment based on the longitude and latitude data of the photovoltaic power station.

[0086] It should be noted that the solar altitude angle and solar azimuth angle corresponding to different longitudes and latitudes will be different. Similarly, for a photovoltaic power station, the corresponding solar altitude angle and solar azimuth angle will not change significantly. The solar altitude angle and solar azimuth angle data corresponding to each moment can be determined based on the longitude and latitude of the photovoltaic power station.

[0087] 402. Obtain historical active power data of each inverter, where the historical active power data includes horizontal plane irradiance, component temperature, and active power at each moment in a historical period.

[0088] The AGC system obtains the active power data of each inverter under normal conditions. The normal state means that the inverter is fault-free, has unlimited power, and the apparent power and AC current of the inverter are both less than the maximum threshold. The historical active power data includes the horizontal plane irradiance, component temperature and active power at each moment in the historical period. The historical period needs to cover a sufficient length of time for the photovoltaic power station, for example, it can be one year.

[0089] Among them, the horizontal plane irradiance, solar altitude angle, and solar azimuth angle can not only reflect the actual inclined plane irradiance that is difficult to measure directly due to the inconsistent orientation and inclination of different components, but also reflect the incident angle of sunlight relative to the component, which in turn reflects the reflection loss of the component, and can also reflect the fixed shading loss such as the shading of the front and rear rows of the component, thus accurately evaluating the actual power generation capacity of the inverter. Therefore, a targeted power generation capacity evaluation model can be trained through the horizontal plane irradiance data, solar altitude angle data, and solar azimuth angle data of the inverter.

[0090] 403. The horizontal irradiance of each inverter at each moment in the historical period, the solar altitude angle at each moment, the solar azimuth angle at each moment and the component temperature at each moment are used as input parameters of the preset evaluation model, the active power of each inverter at each moment in the historical period is used as the output parameter of the preset evaluation model, and the preset evaluation model is trained to obtain the power generation capacity evaluation model of each inverter.

[0091] The AGC system first uses the horizontal irradiance of each inverter at each moment in the historical period, the solar altitude angle at each moment, the solar azimuth angle at each moment, and the component temperature at each moment as the input parameters of the preset evaluation model, and uses the active power at each moment in the historical period as the output parameter of the preset evaluation model. Then, the system performs training based on the input parameters and output parameters to obtain the power generation capacity evaluation model of each inverter.

[0092] The preset evaluation model is an initial model. For different inverters, the same initial model or different initial models may be used. In this embodiment, the same initial model is used as an example for description.

[0093] For example, the horizontal irradiance of an inverter at each moment in a historical period, the solar altitude angle at each moment, the solar azimuth angle at each moment, and the component temperature at each moment are used as input parameters of a preset evaluation model, and the active power of the inverter at each moment in the historical period is used as the output parameter of the preset evaluation model. Then, the preset evaluation model corresponding to the inverter is trained to obtain a power generation capacity evaluation model of the inverter.

[0094] It is understandable that the power generation capacity evaluation model corresponding to each inverter only needs to be trained once and can be directly called later. The preset evaluation model can have various forms, such as neural networks, deep learning, etc., which are not limited here.

[0095] 404. In response to the received AGC instruction of the photovoltaic power station, the estimated maximum power generation capacity corresponding to each inverter in the photovoltaic power station at the current moment is determined by using a plurality of preset power generation capacity evaluation models.

[0096] 405. Obtain the reactive power of each inverter in the photovoltaic power station at the current moment and the AC line voltage of each inverter at the current moment.

[0097] 406. Determine the target maximum power generation capacity corresponding to each inverter at the current moment based on the reactive power of each inverter at the current moment, the AC line voltage of each inverter at the current moment, the maximum AC current threshold corresponding to each inverter, the maximum apparent power threshold corresponding to each inverter and the estimated maximum power generation capacity corresponding to each inverter at the current moment.

[0098] 407. Determine the downward adjustable capacity corresponding to each inverter, the upward adjustable capacity corresponding to each inverter, the downward adjustable capacity corresponding to each array, and the upward adjustable capacity corresponding to each array based on the minimum adjustable power threshold corresponding to each inverter and the target maximum power generation capacity corresponding to each inverter at the current moment.

[0099] 408. Determine the power instruction assigned to each inverter at the current moment based on the AGC instruction of the photovoltaic power station, the downward adjustable capacity corresponding to each inverter, the upward adjustable capacity corresponding to each inverter, the downward adjustable capacity corresponding to each array, and the upward adjustable capacity corresponding to each array.

[0100] Steps 404-408 are similar to steps 301-305 and are not described again here.

[0101] In the embodiment of the present application, a power generation capacity evaluation model corresponding to each inverter is first obtained by training the historical active power data, solar altitude angle data and solar azimuth angle data corresponding to each inverter, and then the estimated maximum power generation capacity of each inverter is determined by the power generation capacity evaluation model corresponding to each inverter, and the estimated maximum power generation capacity of each inverter is corrected by reactive power and AC line voltage to obtain the corrected target maximum power generation capacity, and the AGC instructions of the photovoltaic power station are allocated according to the target maximum power generation capacity corresponding to each inverter, and the power instructions corresponding to each inverter are determined by different calculation methods according to the size of the power generation power of the entire station in the AGC instructions of the photovoltaic power station, so as to solve the problem that the AGC instructions of the photovoltaic power station are unreasonable due to the different maximum power generation capacities of the inverters, thereby causing power generation loss, and achieves the effect of improving the accuracy of AGC instruction allocation of the photovoltaic power station and reducing the power loss in the AGC instruction allocation process of the photovoltaic power station.

[0102] The above describes the method for distributing the AGC command of the photovoltaic power station in the embodiment of the present application. The following describes the device for distributing the AGC command of the photovoltaic power station in the embodiment of the present application. Figure 5 , an embodiment of a distribution device for AGC instructions of a photovoltaic power station in an embodiment of the present application includes:

[0103] The first determination module 501 is used to determine the estimated maximum power generation capacity corresponding to each inverter in the photovoltaic power station at the current moment through a preset power generation capacity evaluation model in response to the received photovoltaic power station AGC instruction;

[0104] A first acquisition module 502 is used to acquire the reactive power of each inverter in the photovoltaic power station at the current moment and the AC line voltage of each inverter at the current moment;

[0105] The second determination module 503 is used to determine the target maximum power generation capacity corresponding to each inverter at the current moment based on the reactive power of each inverter at the current moment, the AC line voltage of each inverter at the current moment, the maximum AC current threshold corresponding to each inverter, the maximum apparent power threshold corresponding to each inverter and the estimated maximum power generation capacity corresponding to each inverter at the current moment;

[0106] The allocation module 504 is used to allocate power based on the AGC instruction of the photovoltaic power station, the minimum adjustable power threshold corresponding to each inverter and the target maximum power generation capacity corresponding to each inverter at the current moment, so as to obtain the power instruction allocated to each inverter at the current moment.

[0107] In a feasible implementation manner, the allocation module 504 includes:

[0108] The first determining unit 5041 is used to determine the downward adjustable capacity corresponding to each inverter, the upward adjustable capacity corresponding to each inverter, the downward adjustable capacity corresponding to each array, and the upward adjustable capacity corresponding to each array based on the minimum adjustable power threshold corresponding to each inverter and the target maximum power generation capacity corresponding to each inverter at the current moment;

[0109] The second determination unit 5042 is used to determine the power instruction assigned to each inverter at the current moment based on the AGC instruction of the photovoltaic power station, the downward adjustable capacity corresponding to each inverter, the upward adjustable capacity corresponding to each inverter, the downward adjustable capacity corresponding to each array and the upward adjustable capacity corresponding to each array.

[0110] In a feasible implementation manner, the first determining unit 5041 is specifically configured to:

[0111] Obtain the active power of each inverter and each array at the current moment;

[0112] Subtract the minimum adjustable power threshold corresponding to each inverter from the active power of each inverter at the current moment to obtain the downward adjustable capacity corresponding to each inverter;

[0113] Subtract the sum of the minimum adjustable power thresholds of each inverter in the corresponding array from the active power of each array at the current moment to obtain the downward adjustable capacity of each array;

[0114] Subtract the active power of each inverter at the current moment from the target maximum power generation capacity corresponding to each inverter at the current moment to obtain the upward adjustable capacity corresponding to each inverter;

[0115] The sum of the target maximum power generation capacity corresponding to each inverter in each array at the current moment is subtracted from the active power of the corresponding array at the current moment to obtain the upward adjustable capacity corresponding to each array.

[0116] In a feasible implementation manner, the second determining unit 5042 is specifically configured to:

[0117] Parsing the AGC command of the photovoltaic power station to obtain the total power generation power required by the photovoltaic power station;

[0118] Obtaining the active power of the grid-connected point of the photovoltaic power station at the current moment and the active power of each inverter at the current moment;

[0119] When the total station power generation is less than the grid connection point active power at the current moment, the downward adjustment amount of each square array at the current moment is determined according to the first difference and the first ratio, wherein the first difference is the difference between the grid connection point active power and the total station power generation, and the first ratio is the ratio of the downward adjustable capacity corresponding to each square array to the sum of the downward adjustable capacity corresponding to each square array;

[0120] Based on the downward adjustment amount of each array at the current moment, the downward adjustable capacity corresponding to each inverter and the sum of the downward adjustable capacity corresponding to each inverter, the downward power adjustment value assigned to each inverter at the current moment is determined, and the power instruction assigned to each inverter at the current moment is generated, and the power instruction includes the downward power adjustment value and the active power at the current moment.

[0121] In a feasible implementation manner, the second determining unit 5042 is further configured to:

[0122] Parsing the AGC command of the photovoltaic power station to obtain the total power generation power required by the photovoltaic power station;

[0123] Obtaining the active power of the grid-connected point of the photovoltaic power station at the current moment and the active power of each inverter at the current moment;

[0124] When the total station power generation is greater than the grid connection point active power at the current moment, and is less than the product of the preset coefficient and the sum of the target maximum power generation capacities corresponding to all arrays at the current moment, the upward adjustment amount of each array at the current moment is determined according to the second difference and the second ratio, wherein the second difference is the difference between the total station power generation and the grid connection point active power, and the second ratio is the ratio of the upward adjustable capacity corresponding to each array to the sum of the upward adjustable capacity corresponding to each array;

[0125] Based on the upward adjustment amount of each array at the current moment, the upward adjustable capacity corresponding to each inverter and the sum of the upward adjustable capacity corresponding to each inverter, the upward power adjustment value assigned to each inverter at the current moment is determined, and the power instruction assigned to each inverter at the current moment is generated, and the power instruction includes the upward power adjustment value and the active power at the current moment.

[0126] In a feasible implementation manner, the second determining unit 5042 is further configured to:

[0127] Parsing the AGC command of the photovoltaic power station to obtain the total power generation power required by the photovoltaic power station;

[0128] Obtaining the active power of the grid-connected point of the photovoltaic power station at the current moment and the active power of each inverter at the current moment;

[0129] When the total station power generation is greater than the product of the preset coefficient and the sum of the target maximum power generation capacity corresponding to all arrays at the current moment, the power instructions assigned to each inverter at the current moment are determined, and the power instructions include an upward power adjustment value and the active power at the current moment. The upward power adjustment value is the difference between the maximum power threshold of the inverter and the active power at the current moment.

[0130] In a feasible implementation manner, the second determining module 503 is specifically configured to:

[0131] Calculating the product of a preset power factor, the AC line voltage of each inverter at the current moment, and the maximum AC current threshold corresponding to each inverter to obtain an actual power calculation value of each inverter;

[0132] The smaller value is taken between the actual power calculation value of each inverter and the maximum apparent power threshold corresponding to each inverter, so as to obtain the maximum apparent power that can be generated by each inverter;

[0133] Determine the maximum value of the active power that can be generated by each inverter based on the maximum apparent power that can be generated by each inverter and the reactive power of each inverter at the current moment;

[0134] The smaller value is taken between the maximum value of the active power that can be generated by each inverter and the maximum power generation capacity corresponding to each inverter at the current moment, so as to obtain the target maximum power generation capacity corresponding to each inverter at the current moment.

[0135] In a feasible implementation manner, the photovoltaic power station AGC instruction distribution device further includes:

[0136] An adjustment determination module 505 is used to adjust the power instruction corresponding to the target inverter to the actual power and determine the power difference to be increased when the actual power of any target inverter is less than a preset multiple of the allocated power instruction, wherein the power difference to be increased is the difference between the power instruction allocated to the target inverter and the actual power;

[0137] A third determining module 506 is used to determine a plurality of upward-adjusting inverters belonging to the same matrix as the target inverter, wherein the upward-adjusting inverters are inverters participating in the allocation of the power difference to be upward-adjusted;

[0138] A fourth determining module 507, configured to determine a power increase value of each upward inverter according to the power difference to be allocated, the upward adjustable capacity of each upward inverter, and the sum of the upward adjustable capacity of each upward inverter;

[0139] The adjustment module 508 is used to adjust the power instructions assigned to each upward-regulated inverter based on the power upward-regulated value of each upward-regulated inverter, so as to obtain the upward-regulated power instructions corresponding to each upward-regulated inverter.

[0140] In a feasible implementation manner, the photovoltaic power station AGC instruction distribution device further includes:

[0141] The second acquisition module 509 is used to acquire the longitude and latitude data of the photovoltaic power station, and calculate the solar altitude angle and the solar azimuth angle of the photovoltaic power station at each moment based on the longitude and latitude data of the photovoltaic power station;

[0142] The second acquisition module 509 is further used to acquire historical active power data of each inverter, wherein the historical active power data includes horizontal plane irradiance, component temperature and active power at each moment in the historical period;

[0143] The training module 510 is used to use the horizontal plane irradiance of each inverter at each moment in the historical period, the solar altitude angle at each moment, the solar azimuth angle at each moment and the component temperature at each moment as the input parameters of the preset evaluation model, use the active power of each inverter at each moment in the historical period as the output parameter of the preset evaluation model, and train the preset evaluation model to obtain the power generation capacity evaluation model of each inverter.

[0144] In the embodiment of the present application, the power generation capacity evaluation model corresponding to each inverter is first obtained by training the historical active power data, solar altitude angle data and solar azimuth angle data corresponding to each inverter, and then the estimated maximum power generation capacity of each inverter is determined by the power generation capacity evaluation model corresponding to each inverter, and the estimated maximum power generation capacity of each inverter is corrected by reactive power and AC line voltage to obtain the corrected target maximum power generation capacity, and the photovoltaic power station AGC instructions are allocated according to the target maximum power generation capacity corresponding to each inverter, and the power instructions corresponding to each inverter are determined by different calculation methods according to the size of the power generation power of the whole station in the photovoltaic power station AGC instructions, which solves the problem that the photovoltaic power station AGC instructions are not allocated reasonably due to the different maximum power generation capacities of the inverters, thereby causing power loss, and achieves the effect of improving the accuracy of the photovoltaic power station AGC instruction allocation and reducing the power loss in the photovoltaic power station AGC instruction allocation process. At the same time, after one adjustment is completed, the unused power instructions are redistributed, which reduces the power loss in the adjustment process and improves the utilization rate of the photovoltaic power station AGC instructions.

[0145] See also Figure 6 As shown, the AGC system further includes a processor and a memory. The memory 601 stores machine executable instructions that can be executed by the processor 600. The processor 600 executes the machine executable instructions to implement the above-mentioned photovoltaic power station AGC instruction distribution method.

[0146] Further, Figure 6 The AGC system shown further includes a bus 602 and a communication interface 603 , and the processor 600 , the communication interface 603 and the memory 601 are connected via the bus 602 .

[0147] The memory 601 may include a high-speed random access memory (RAM), and may also include a non-volatile memory (non-volatile memory), for example, at least one disk storage. The communication connection between the system network element and at least one other network element is realized through at least one communication interface 603 (which may be wired or wireless), and the Internet, wide area network, local area network, metropolitan area network, etc. may be used. The bus 602 may be an ISA bus, a PCI bus, or an EISA bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 6 Only one bidirectional arrow is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0148] The processor 600 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the hardware integrated logic circuit or software instructions in the processor 600. The above processor 600 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The disclosed methods, steps and logic block diagrams in the embodiments of the present disclosure can be implemented or executed. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor. The steps of the method disclosed in conjunction with the embodiments of the present disclosure can be directly embodied as a hardware decoding processor to be executed, or a combination of hardware and software modules in the decoding processor can be executed. The software module can be located in a mature storage medium in the field such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory 601 , and the processor 600 reads the information in the memory 601 and completes the method steps of the above-mentioned embodiment in combination with its hardware.

[0149] The present application also provides a computer-readable storage medium, which may be a non-volatile computer-readable storage medium or a volatile computer-readable storage medium. The computer-readable storage medium stores instructions. When the instructions are executed on a computer, the computer executes the steps of allocating the photovoltaic power station AGC instructions. The steps specifically include:

[0150] In response to the received AGC instruction of the photovoltaic power station, the estimated maximum power generation capacity corresponding to each inverter in the photovoltaic power station at the current moment is determined through multiple preset power generation capacity evaluation models; the reactive power of each inverter in the photovoltaic power station at the current moment and the AC line voltage of each inverter at the current moment are obtained; based on the reactive power of each inverter at the current moment, the AC line voltage of each inverter at the current moment, the maximum AC current threshold corresponding to each inverter, the maximum apparent power threshold corresponding to each inverter and the estimated maximum power generation capacity corresponding to each inverter at the current moment, the target maximum power generation capacity corresponding to each inverter at the current moment is determined; power is allocated based on the AGC instruction of the photovoltaic power station, the minimum adjustable power threshold corresponding to each inverter and the target maximum power generation capacity corresponding to each inverter at the current moment, so as to obtain the power instruction allocated to each inverter at the current moment. In the embodiment of the present application, the estimated maximum power generation capacity of each inverter is determined through a preset power generation capacity evaluation model, and the estimated maximum power generation capacity of each inverter is corrected by reactive power and AC line voltage to obtain the corrected target maximum power generation capacity, and the AGC instructions of the photovoltaic power station are allocated according to the target maximum power generation capacity corresponding to each inverter, thereby solving the problem of unreasonable AGC instruction allocation of the photovoltaic power station due to different maximum power generation capacities of the inverters, which in turn causes power generation loss, and achieves the effect of improving the accuracy of AGC instruction allocation of the photovoltaic power station and reducing the power loss in the process of AGC instruction allocation of the photovoltaic power station.

[0151] The above-mentioned power allocation is performed based on the AGC instruction of the photovoltaic power station, the minimum adjustable power threshold corresponding to each inverter and the target maximum power generation capacity corresponding to each inverter at the current moment, and the power instruction assigned to each inverter at the current moment is obtained, including: determining the downward adjustable capacity corresponding to each inverter, the upward adjustable capacity corresponding to each inverter, the downward adjustable capacity corresponding to each array and the upward adjustable capacity corresponding to each array based on the minimum adjustable power threshold corresponding to each inverter and the target maximum power generation capacity corresponding to each inverter at the current moment; determining the power instruction assigned to each inverter at the current moment based on the AGC instruction of the photovoltaic power station, the downward adjustable capacity corresponding to each inverter, the upward adjustable capacity corresponding to each inverter, the downward adjustable capacity corresponding to each array and the upward adjustable capacity corresponding to each array.

[0152] The above-mentioned method determines the downward adjustable capacity corresponding to each inverter, the upward adjustable capacity corresponding to each inverter, the downward adjustable capacity corresponding to each array, and the upward adjustable capacity corresponding to each array based on the minimum adjustable power threshold corresponding to each inverter and the target maximum power generation capacity corresponding to each inverter at the current moment, including: obtaining the active power of each inverter at the current moment and the active power of each array at the current moment; subtracting the minimum adjustable power threshold corresponding to each inverter from the active power of each inverter at the current moment, and obtaining the active power corresponding to each inverter. The downward adjustable capacity of each array is obtained by subtracting the sum of the minimum adjustable power thresholds of each inverter in the corresponding array from the active power of each array at the current moment, and obtaining the downward adjustable capacity of each array; the target maximum power generation capacity corresponding to each inverter at the current moment is subtracted from the active power of each inverter at the current moment, and obtaining the upward adjustable capacity of each inverter; the sum of the target maximum power generation capacity corresponding to each inverter in each array at the current moment is subtracted from the active power of the corresponding array at the current moment, and obtaining the upward adjustable capacity of each array.

[0153] The above-mentioned method of determining the power instruction assigned to each inverter at the current moment based on the AGC instruction of the photovoltaic power station, the downward adjustable capacity corresponding to each inverter, the upward adjustable capacity corresponding to each inverter, the downward adjustable capacity corresponding to each array and the upward adjustable capacity corresponding to each array includes: parsing the AGC instruction of the photovoltaic power station to obtain the total station power generation power required to be provided by the photovoltaic power station; obtaining the grid-connected point active power of the photovoltaic power station at the current moment and the active power of each inverter at the current moment; when the total station power generation power is less than the grid-connected point active power at the current moment, according to the first difference and the first ratio Determine the downward adjustment amount of each array at the current moment, the first difference is the difference between the active power of the grid-connected point and the generated power of the entire station, and the first ratio is the ratio of the downward adjustable capacity corresponding to each array to the sum of the downward adjustable capacities corresponding to each array; determine the downward power adjustment value assigned to each inverter at the current moment based on the downward adjustment amount of each array at the current moment, the downward adjustable capacity corresponding to each inverter and the sum of the downward adjustable capacities corresponding to each inverter, and generate the power instruction assigned to each inverter at the current moment, the power instruction including the downward power adjustment value and the active power at the current moment.

[0154] The above-mentioned method of determining the power instruction assigned to each inverter at the current moment based on the AGC instruction of the photovoltaic power station, the downward adjustable capacity corresponding to each inverter, the upward adjustable capacity corresponding to each inverter, the downward adjustable capacity corresponding to each array and the upward adjustable capacity corresponding to each array also includes: parsing the AGC instruction of the photovoltaic power station to obtain the total station power generation power required to be provided by the photovoltaic power station; obtaining the grid-connected point active power of the photovoltaic power station at the current moment and the active power of each inverter at the current moment; when the total station power generation power is greater than the grid-connected point active power at the current moment, and less than the preset coefficient and the target maximum power generation capacity corresponding to all arrays at the current moment When the product of the sum of the second and the second difference is taken, the upward adjustment amount of each array at the current moment is determined according to the second difference and the second ratio, the second difference being the difference between the total station power generation and the active power of the grid-connected point, and the second ratio being the ratio of the upward adjustable capacity corresponding to each array to the sum of the upward adjustable capacities corresponding to each array; based on the upward adjustment amount of each array at the current moment, the upward adjustable capacity corresponding to each inverter and the sum of the upward adjustable capacities corresponding to each inverter, the upward power adjustment value assigned to each inverter at the current moment is determined, and the power instruction assigned to each inverter at the current moment is generated, the power instruction including the upward power adjustment value and the active power at the current moment.

[0155] The above-mentioned method of determining the power instruction assigned to each inverter at the current moment based on the AGC instruction of the photovoltaic power station, the downward adjustable capacity corresponding to each inverter, the upward adjustable capacity corresponding to each inverter, the downward adjustable capacity corresponding to each array and the upward adjustable capacity corresponding to each array also includes: parsing the AGC instruction of the photovoltaic power station to obtain the total station power generation power required to be provided by the photovoltaic power station; obtaining the grid-connected point active power of the photovoltaic power station at the current moment and the active power of each inverter at the current moment; when the total station power generation power is greater than the product of the preset coefficient and the sum of the target maximum power generation capacity corresponding to all arrays at the current moment, determining the power instruction assigned to each inverter at the current moment, the power instruction includes an upward power adjustment value and the active power at the current moment, and the upward power adjustment value is the difference between the maximum power threshold of the inverter and the active power at the current moment.

[0156] The above-mentioned method of determining the target maximum power generation capacity corresponding to each inverter at the current moment based on the reactive power of each inverter at the current moment, the AC line voltage of each inverter at the current moment, the maximum AC current threshold corresponding to each inverter, the maximum apparent power threshold corresponding to each inverter and the estimated maximum power generation capacity corresponding to each inverter at the current moment includes: calculating the product of a preset power factor, the AC line voltage of each inverter at the current moment and the maximum AC current threshold corresponding to each inverter to obtain the actual power calculation value of each inverter; taking the smaller value between the actual power calculation value of each inverter and the maximum apparent power threshold corresponding to each inverter to obtain the maximum apparent power that can be generated by each inverter; determining the maximum value of the active power that can be generated by each inverter based on the maximum apparent power that can be generated by each inverter and the reactive power of each inverter at the current moment; taking the smaller value between the maximum value of the active power that can be generated by each inverter and the maximum power generation capacity corresponding to each inverter at the current moment to obtain the target maximum power generation capacity corresponding to each inverter at the current moment.

[0157] After the power is allocated based on the AGC instruction of the photovoltaic power station, the minimum adjustable power threshold corresponding to each inverter and the target maximum power generation capacity corresponding to each inverter at the current moment, and the power instruction allocated to each inverter at the current moment is obtained, it also includes: when the actual power of any target inverter is less than the preset multiple of the allocated power instruction, the power instruction corresponding to the target inverter is adjusted to the actual power and the power difference to be increased is determined, and the power difference to be increased is the difference between the power instruction allocated to the target inverter and the actual power; multiple upward adjustment inverters belonging to the same array as the target inverter are determined, and the upward adjustment inverter is the inverter participating in the allocation of the power difference to be increased; the power increase value of each upward adjustment inverter is determined according to the power difference to be allocated, the upward adjustable capacity of each upward adjustment inverter, and the sum of the upward adjustable capacity of each upward adjustment inverter; the power increase value of each upward adjustment inverter is adjusted based on the power increase value of each upward adjustment inverter, and the increased power instruction corresponding to each upward adjustment inverter is obtained.

[0158] Before the above-mentioned response to the received AGC instruction of the photovoltaic power station, it also includes: obtaining the longitude and latitude data of the photovoltaic power station, and calculating the solar altitude angle and the solar azimuth angle of the photovoltaic power station at each moment based on the longitude and latitude data of the photovoltaic power station; obtaining the historical active power data of each inverter, the historical active power data includes the horizontal plane irradiance, component temperature and active power at each moment in the historical period; using the horizontal plane irradiance, solar altitude angle, solar azimuth and component temperature of each inverter at each moment in the historical period as input parameters of the preset evaluation model, using the active power of each inverter at each moment in the historical period as the output parameter of the preset evaluation model, and training the preset evaluation model to obtain the power generation capacity evaluation model of each inverter.

[0159] The above-mentioned response to the received photovoltaic power station AGC instruction determines the estimated maximum power generation capacity corresponding to each inverter in the photovoltaic power station at the current moment through multiple preset power generation capacity evaluation models, including: in response to the received photovoltaic power station AGC instruction, obtaining the horizontal plane irradiance, solar altitude angle, solar azimuth angle and component temperature of each inverter in the photovoltaic power station at the current moment; inputting the horizontal plane irradiance, solar altitude angle, solar azimuth angle and component temperature of each inverter at the current moment into the power generation capacity evaluation model corresponding to each inverter, and obtaining the active power of each inverter at the current moment; determining the active power of each inverter at the current moment as the estimated maximum power generation capacity of each inverter at the current moment.

[0160] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0161] In addition, in the description of the embodiments of the present application, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0162] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0163] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0164] Finally, it should be noted that the above embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the above embodiments, those skilled in the art should understand that any person skilled in the art who is familiar with the technical field can still modify the technical solutions recorded in the above embodiments within the technical scope disclosed in the present application, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A method for allocating AGC instructions for a photovoltaic power station, characterized in that: The photovoltaic power station includes a plurality of inverters, and the method for allocating AGC instructions of the photovoltaic power station includes: In response to the received AGC instruction of the photovoltaic power station, the estimated maximum power generation capacity corresponding to each inverter in the photovoltaic power station at the current moment is determined by using a plurality of preset power generation capacity evaluation models; Obtaining the reactive power of each inverter in the photovoltaic power station at the current moment and the AC line voltage of each inverter at the current moment; Determine the target maximum power generation capacity corresponding to each inverter at the current moment based on the reactive power of each inverter at the current moment, the AC line voltage of each inverter at the current moment, the maximum AC current threshold corresponding to each inverter, the maximum apparent power threshold corresponding to each inverter, and the estimated maximum power generation capacity corresponding to each inverter at the current moment; Power allocation is performed based on the AGC instruction of the photovoltaic power station, the minimum adjustable power threshold corresponding to each inverter and the target maximum power generation capacity corresponding to each inverter at the current moment, so as to obtain the power instruction allocated to each inverter at the current moment.

2. The method for distributing AGC instructions of a photovoltaic power station according to claim 1, characterized in that: The power allocation is performed based on the AGC instruction of the photovoltaic power station, the minimum adjustable power threshold corresponding to each inverter, and the target maximum power generation capacity corresponding to each inverter at the current moment, to obtain the power instruction allocated to each inverter at the current moment, including: Determine the downward adjustable capacity corresponding to each inverter, the upward adjustable capacity corresponding to each inverter, the downward adjustable capacity corresponding to each array, and the upward adjustable capacity corresponding to each array based on the minimum adjustable power threshold corresponding to each inverter and the target maximum power generation capacity corresponding to each inverter at the current moment; The power instructions assigned to each inverter at the current moment are determined based on the AGC instructions of the photovoltaic power station, the downward adjustable capacity corresponding to each inverter, the upward adjustable capacity corresponding to each inverter, the downward adjustable capacity corresponding to each array and the upward adjustable capacity corresponding to each array.

3. The method for distributing AGC instructions of a photovoltaic power station according to claim 2, characterized in that: The determining, based on the minimum adjustable power threshold corresponding to each inverter and the target maximum power generation capacity corresponding to each inverter at the current moment, the downward adjustable capacity corresponding to each inverter, the upward adjustable capacity corresponding to each inverter, the downward adjustable capacity corresponding to each array, and the upward adjustable capacity corresponding to each array includes: Obtain the active power of each inverter and each array at the current moment; Subtract the minimum adjustable power threshold corresponding to each inverter from the active power of each inverter at the current moment to obtain the downward adjustable capacity corresponding to each inverter; Subtract the sum of the minimum adjustable power thresholds of each inverter in the corresponding array from the active power of each array at the current moment to obtain the downward adjustable capacity of each array; Subtract the active power of each inverter at the current moment from the target maximum power generation capacity corresponding to each inverter at the current moment to obtain the upward adjustable capacity corresponding to each inverter; The upward adjustable capacity of each array is obtained by subtracting the active power of the corresponding array at the current moment from the sum of the target maximum power generation capacity of each inverter in each array at the current moment.

4. The method for distributing AGC instructions of a photovoltaic power station according to claim 2, characterized in that: The step of determining the power instruction assigned to each inverter at the current moment based on the AGC instruction of the photovoltaic power station, the downward adjustable capability corresponding to each inverter, the upward adjustable capability corresponding to each inverter, the downward adjustable capability corresponding to each array, and the upward adjustable capability corresponding to each array includes: Parsing the AGC command of the photovoltaic power station to obtain the total power generation power required by the photovoltaic power station; Obtaining the active power of the grid-connected point of the photovoltaic power station at the current moment and the active power of each inverter at the current moment; When the total station power generation is less than the grid connection point active power at the current moment, the downward adjustment amount of each square array at the current moment is determined according to the first difference and the first ratio, wherein the first difference is the difference between the grid connection point active power and the total station power generation, and the first ratio is the ratio of the downward adjustable capacity corresponding to each square array to the sum of the downward adjustable capacity corresponding to each square array; Based on the downward adjustment amount of each array at the current moment, the downward adjustable capacity corresponding to each inverter and the sum of the downward adjustable capacity corresponding to each inverter, the downward power adjustment value assigned to each inverter at the current moment is determined, and the power instruction assigned to each inverter at the current moment is generated, and the power instruction includes the downward power adjustment value and the active power at the current moment.

5. The method for distributing AGC instructions of a photovoltaic power station according to claim 2, characterized in that: The method of determining the power instruction assigned to each inverter at the current moment based on the AGC instruction of the photovoltaic power station, the downward adjustable capability corresponding to each inverter, the upward adjustable capability corresponding to each inverter, the downward adjustable capability corresponding to each array, and the upward adjustable capability corresponding to each array, further includes: Parsing the AGC command of the photovoltaic power station to obtain the total power generation power required by the photovoltaic power station; Obtaining the active power of the grid-connected point of the photovoltaic power station at the current moment and the active power of each inverter at the current moment; When the total station power generation is greater than the grid connection point active power at the current moment, and is less than the product of the preset coefficient and the sum of the target maximum power generation capacities corresponding to all arrays at the current moment, the upward adjustment amount of each array at the current moment is determined according to the second difference and the second ratio, wherein the second difference is the difference between the total station power generation and the grid connection point active power, and the second ratio is the ratio of the upward adjustable capacity corresponding to each array to the sum of the upward adjustable capacity corresponding to each array; Based on the upward adjustment amount of each array at the current moment, the upward adjustable capacity corresponding to each inverter and the sum of the upward adjustable capacity corresponding to each inverter, the upward power adjustment value assigned to each inverter at the current moment is determined, and the power instruction assigned to each inverter at the current moment is generated, and the power instruction includes the upward power adjustment value and the active power at the current moment.

6. The method for distributing AGC instructions of a photovoltaic power station according to claim 2, characterized in that: The method of determining the power instruction assigned to each inverter at the current moment based on the AGC instruction of the photovoltaic power station, the downward adjustable capability corresponding to each inverter, the upward adjustable capability corresponding to each inverter, the downward adjustable capability corresponding to each array, and the upward adjustable capability corresponding to each array, further includes: Parsing the AGC command of the photovoltaic power station to obtain the total power generation power required by the photovoltaic power station; Obtaining the active power of the grid-connected point of the photovoltaic power station at the current moment and the active power of each inverter at the current moment; When the total station power generation is greater than the product of the preset coefficient and the sum of the target maximum power generation capacity corresponding to all arrays at the current moment, the power instructions assigned to each inverter at the current moment are determined, and the power instructions include an upward power adjustment value and the active power at the current moment. The upward power adjustment value is the difference between the maximum power threshold of the inverter and the active power at the current moment.

7. The method for distributing AGC instructions of a photovoltaic power station according to claim 1, characterized in that: The determining of the target maximum power generation capacity corresponding to each inverter at the current moment based on the reactive power of each inverter at the current moment, the AC line voltage of each inverter at the current moment, the maximum AC current threshold corresponding to each inverter, the maximum apparent power threshold corresponding to each inverter and the estimated maximum power generation capacity corresponding to each inverter at the current moment comprises: Calculating the product of a preset power factor, the AC line voltage of each inverter at the current moment, and the maximum AC current threshold corresponding to each inverter to obtain an actual power calculation value of each inverter; The smaller value is taken between the actual power calculation value of each inverter and the maximum apparent power threshold corresponding to each inverter, so as to obtain the maximum apparent power that can be generated by each inverter; Determine the maximum value of the active power that can be generated by each inverter based on the maximum apparent power that can be generated by each inverter and the reactive power of each inverter at the current moment; The smaller value is taken between the maximum value of the active power that can be generated by each inverter and the maximum power generation capacity corresponding to each inverter at the current moment, so as to obtain the target maximum power generation capacity corresponding to each inverter at the current moment.

8. The method for allocating AGC instructions of a photovoltaic power station according to any one of claims 1 to 7, characterized in that: After performing power allocation based on the AGC instruction of the photovoltaic power station, the minimum adjustable power threshold corresponding to each inverter and the target maximum power generation capacity corresponding to each inverter at the current moment to obtain the power instruction allocated to each inverter at the current moment, the method further includes: When the actual power of any target inverter is less than a preset multiple of the allocated power command, the power command corresponding to the target inverter is adjusted to the actual power and the power difference to be increased is determined, where the power difference to be increased is the difference between the power command allocated to the target inverter and the actual power; Determine a plurality of upward-adjusting inverters that belong to the same array as the target inverter, wherein the upward-adjusting inverters are inverters that participate in the allocation of the power difference to be upward-adjusted; Determining a power increase value of each upward inverter according to the power difference to be allocated, the upward adjustable capacity of each upward inverter, and the sum of the upward adjustable capacity of each upward inverter; The power instructions assigned to each upward-regulated inverter are adjusted based on the power upward-regulated value of each upward-regulated inverter, so as to obtain the upward-regulated power instructions corresponding to each upward-regulated inverter.

9. The method for allocating AGC instructions of a photovoltaic power station according to any one of claims 1 to 7, characterized in that: Before responding to the received photovoltaic power station AGC instruction, the method further includes: Obtaining the longitude and latitude data of the photovoltaic power station, and calculating the solar altitude angle and the solar azimuth angle of the photovoltaic power station at each moment based on the longitude and latitude data of the photovoltaic power station; Acquire historical active power data of each inverter, wherein the historical active power data includes horizontal plane irradiance, component temperature and active power at each moment in a historical period; The horizontal irradiance of each inverter at each moment in the historical period, the solar altitude angle at each moment, the solar azimuth angle at each moment and the component temperature at each moment are used as input parameters of the preset evaluation model, and the active power of each inverter at each moment in the historical period is used as the output parameter of the preset evaluation model. The preset evaluation model is trained to obtain the power generation capacity evaluation model of each inverter.

10. The method for allocating AGC instructions of a photovoltaic power station according to any one of claims 1 to 7, characterized in that: The step of responding to the received AGC instruction of the photovoltaic power station and determining the estimated maximum power generation capacity corresponding to each inverter in the photovoltaic power station at the current moment through a plurality of preset power generation capacity evaluation models includes: In response to the received photovoltaic power station AGC instruction, the horizontal plane irradiance, solar altitude angle, solar azimuth angle and component temperature of each inverter in the photovoltaic power station at the current moment are obtained; Input the horizontal irradiance, solar altitude angle, solar azimuth angle and component temperature of each inverter at the current moment into the power generation capacity evaluation model corresponding to each inverter to obtain the active power of each inverter at the current moment; The active power of each inverter at the current moment is determined as the estimated maximum power generation capacity of each inverter at the current moment.

11. A device for distributing AGC instructions of a photovoltaic power station, characterized in that: The photovoltaic power station includes a plurality of inverters, and the distribution device of the AGC instruction of the photovoltaic power station includes: A first determination module is used to determine the estimated maximum power generation capacity corresponding to each inverter in the photovoltaic power station at the current moment through a preset power generation capacity evaluation model in response to the received photovoltaic power station AGC instruction; An acquisition module, used to acquire the reactive power of each inverter in the photovoltaic power station at the current moment and the AC line voltage of each inverter at the current moment; A second determination module is used to determine the target maximum power generation capacity corresponding to each inverter at the current moment based on the reactive power of each inverter at the current moment, the AC line voltage of each inverter at the current moment, the maximum AC current threshold corresponding to each inverter, the maximum apparent power threshold corresponding to each inverter and the estimated maximum power generation capacity corresponding to each inverter at the current moment; The allocation module is used to allocate power based on the AGC instruction of the photovoltaic power station, the minimum adjustable power threshold corresponding to each inverter and the target maximum power generation capacity corresponding to each inverter at the current moment, so as to obtain the power instruction allocated to each inverter at the current moment.

12. An AGC system, characterized in that: The AGC system includes a memory and at least one processor, the memory stores instructions, and the memory and the at least one processor are interconnected via a line; The at least one processor calls the instruction in the memory so that the AGC system executes the method for distributing AGC instructions for a photovoltaic power station as described in any one of claims 1 to 10.

13. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores instructions, and when the instructions are executed by the processor, the method for allocating AGC instructions for a photovoltaic power station according to any one of claims 1 to 10 is implemented.

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