Active power regulation methods, devices, equipment and media for photovoltaic power plants

Abstract

This invention discloses a method, device, equipment, and medium for regulating the active power of a photovoltaic power station, belonging to the technical field of photovoltaic power generation. First, the power to be allocated is determined based on the target power for regulating the active power of the photovoltaic power station and the current active power of a preset fully-powered unit. Then, the actual regulating power of each power generation unit within the photovoltaic power station is determined based on the power to be allocated and the weighting coefficients of each power generation unit. Finally, the current active power of each power generation unit is adjusted to the actual regulating power. This reduces the number of allocation corrections (reducing the number of allocations to one) when regulating the power generation of the photovoltaic power station, accurately, quickly, and reasonably allocating the power generation of each power generation unit within the photovoltaic power station, tracking the target power for regulation, significantly reducing power generation losses caused by multiple adjustments required by the average allocation scheme, and improving the power generation revenue of the photovoltaic power station.

Description

Technical Field

[0001] This invention relates to the technical field of photovoltaic power generation, and in particular to a method for regulating the active power of a photovoltaic power station, a device for regulating the active power of a photovoltaic power station, an equipment for regulating the active power of a photovoltaic power station, and a computer-readable storage medium. Background Technology

[0002] As more and more photovoltaic (PV) power plants are connected to the grid, the acceptance standards for AGC (Automatic Generation Control) commissioning of PV power plants are becoming increasingly stringent. Currently, the standard for AGC commissioning testing requires completing a closed-loop adjustment of active power multiple times within 25 seconds, and the actual active power curve must match the target curve with an error within 1% of the rated value. For flat-land PV power plants without shading or other influences, the output levels of each power generation unit (inverter or PV subarray) are very similar, and an average-distribution open-loop control method can quickly meet the AGC commissioning requirements. However, for PV power plants with significant differences in output between power generation units, such as mountainous PV power plants, the power generation of each unit at any given time is different. A single adjustment is unlikely to achieve the target, and too many adjustments are too time-consuming.

[0003] Because each power generation unit has a different power generation capacity, and the average distribution regulation scheme cannot know the power generation capacity of each unit during power regulation, multiple corrections are required within the allowable regulation cycle. This leads to two problems: firstly, waveform jitter and easy resonance interference to the power grid; secondly, when increasing power, it takes multiple corrections to track the target value, resulting in a non-negligible loss of power generation. Summary of the Invention

[0004] The main objective of this invention is to provide a method, device, equipment, and computer-readable storage medium for regulating the active power of a photovoltaic power station, thereby solving the technical problem in the prior art of accurately and quickly allocating the power generation of each power generation unit within a photovoltaic power station when regulating its power generation.

[0005] To achieve the above objectives, the present invention provides a method for regulating the active power of a photovoltaic power station, comprising the following steps:

[0006] Determine the weighting coefficients of each power generation unit within the photovoltaic power station;

[0007] The power to be allocated is determined based on the adjustment target power of the photovoltaic power station's active power and the current active power of the preset full-power unit;

[0008] The actual adjustment power of each power generation unit in the photovoltaic power station is determined based on the power to be allocated and the weighting coefficient, and the current active power of each power generation unit is adjusted to the actual adjustment power.

[0009] Optionally, the step of determining the weighting coefficients of each power generation unit within the photovoltaic power station includes:

[0010] Determine the current adjustment scenario corresponding to the target power, and determine historical similar days that are similar to the current adjustment scenario;

[0011] The weighting coefficient of each power generation unit in the photovoltaic power station is determined based on the similar daily power of each power generation unit in the photovoltaic power station on the historical similar days.

[0012] Optionally, the step of determining historical similar days similar to the current adjustment scenario includes:

[0013] Obtain the current electrical parameters and current environmental parameters under the current adjustment scenario;

[0014] Based on the current electrical parameters and the current environmental parameters, determine historical similar days that are similar to the current adjustment scenario.

[0015] Optionally, the step of determining the weighting coefficient of each power generation unit in the photovoltaic power station based on the similar daily power of each power generation unit in the photovoltaic power station on the historical similar days includes:

[0016] Based on the similar daily power of a preset fully-powered unit, the power ratio between the similar daily power of the preset fully-powered unit and the similar daily power of each other power generation unit in the photovoltaic power station other than the preset fully-powered unit is determined, and the power ratio is used as the weighting coefficient of each other power generation unit.

[0017] The weight coefficient of the preset full-output unit is 1.

[0018] Optionally, the step of determining the actual regulating power of each power generation unit in the photovoltaic power station based on the power to be allocated and the weighting coefficient includes:

[0019] If the power generation unit is a preset full-power unit, then the actual adjustment power of the preset full-power unit is determined to be the current active power of the preset full-power unit.

[0020] Optionally, the step of determining the actual regulating power of each power generation unit in the photovoltaic power station based on the power to be allocated and the weighting coefficient includes:

[0021] If the power generation unit is not a preset full-power unit, then the weight ratio between the weight coefficient of the non-preset full-power unit and the sum of the weight coefficients of all non-preset full-power units is determined, and the actual adjustment power of each power generation unit in the photovoltaic power station is determined according to the power to be allocated and the weight ratio corresponding to each power generation unit.

[0022] Optionally, before the step of adjusting the current active power of each power generation unit to the actual adjusted power, the method further includes:

[0023] Determine the maximum adjustable active power of each power generation unit in the photovoltaic power station;

[0024] If the actual regulated power of each power generation unit is not greater than the corresponding maximum active power, then the step of adjusting the current active power of each power generation unit to the actual regulated power is executed.

[0025] Optionally, the step of determining the maximum adjustable active power of each power generation unit in the photovoltaic power station includes:

[0026] The maximum adjustable active power of each power generation unit in the photovoltaic power station is determined based on the current active power of the preset full-power unit and the weighting coefficient of each power generation unit.

[0027] Optionally, before the step of determining the weighting coefficients of each power generation unit within the photovoltaic power station, the method further includes:

[0028] If the power regulation instruction corresponding to the active power regulation target power of the photovoltaic power station is an instruction to increase the active power of the photovoltaic power station, then the step of determining the weight coefficient of each power generation unit in the photovoltaic power station is executed.

[0029] Furthermore, to achieve the above objectives, the present invention also provides a photovoltaic power station active power regulation device, which is used for:

[0030] The weighting coefficient determination module is used to determine the weighting coefficient of each power generation unit in the photovoltaic power station;

[0031] The power to be allocated module is used to determine the power to be allocated based on the adjustment target power of the active power of the photovoltaic power station and the current active power of the preset full-power unit;

[0032] The actual adjustment power determination module is used to determine the actual adjustment power of each power generation unit in the photovoltaic power station based on the power to be allocated and the weighting coefficient, and adjust the current active power of each power generation unit to the actual adjustment power.

[0033] In addition, to achieve the above objectives, the present invention also provides a photovoltaic power plant active power regulation device, the photovoltaic power plant active power regulation device comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the photovoltaic power plant active power regulation method as described above.

[0034] In addition, to achieve the above objectives, the present invention also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the photovoltaic power plant active power regulation method as described above.

[0035] This invention provides a method, device, equipment, and computer-readable storage medium for regulating the active power of a photovoltaic power station. The method determines the weighting coefficient of each power generation unit within the photovoltaic power station; determines the power to be allocated based on the target power for regulating the active power of the photovoltaic power station and the current active power of a preset fully-powered unit; determines the actual regulating power of each power generation unit within the photovoltaic power station based on the power to be allocated and the weighting coefficient, and regulates the current active power of each power generation unit to the actual regulating power.

[0036] First, the power to be allocated is determined based on the target power of the active power of the photovoltaic power station and the current active power of the preset full-power unit; then, the actual adjustment power of each power generation unit in the photovoltaic power station is determined based on the power to be allocated and the weight coefficient of each power generation unit in the photovoltaic power station; finally, the current active power of each power generation unit is adjusted to the actual adjustment power.

[0037] Compared to the average allocation strategy used in photovoltaic power plants with significant differences in the power generation capacity of individual units, which requires multiple adjustments to the power generation capacity and active power of each unit, ensuring that the preset fully-powered unit always operates at full capacity, and calculating the actual adjusted power of each unit based on its power generation capacity and the power to be allocated, this approach proposes a non-average allocation strategy. This strategy fixes the preset fully-powered unit from participating in power limiting control, uses the preset fully-powered unit as a benchmark to solve for the power generation capacity of the remaining units, and formulates an allocation scheme for the power to be allocated based on this capacity, distributing the power to be allocated to the remaining units. This reduces the number of allocation corrections (reducing the allocation to one) when adjusting the power generation of the photovoltaic power plant, accurately, quickly, and reasonably allocating the power generation capacity of each unit within the photovoltaic power plant, tracking the target power of the photovoltaic power plant, significantly reducing the power generation losses caused by the average allocation scheme requiring multiple adjustments, and improving the power generation revenue of the photovoltaic power plant. Attached Figure Description

[0038] Figure 1This is a schematic diagram of the structure of the operating device of the hardware operating environment involved in the embodiments of the present invention;

[0039] Figure 2 This is a flowchart illustrating an embodiment of a photovoltaic power station active power regulation method according to the present invention;

[0040] Figure 3 This is a schematic diagram illustrating an embodiment of the active power regulation method for a photovoltaic power station according to the present invention.

[0041] Figure 4 This is a schematic diagram showing the specific power values ​​of each power generation unit at the current time and at the corresponding time of a similar historical day, according to an embodiment of the active power regulation method for a photovoltaic power station of the present invention.

[0042] Figure 5 This is a weighting coefficient and active power capacity (maximum active power Pmax) of an embodiment of a photovoltaic power plant active power regulation method of the present invention. i ) and power allocation values ​​(actual regulating power P of each power generation unit) i ) Schematic diagram;

[0043] Figure 6 This is a schematic diagram of the average distribution strategy of an embodiment of a photovoltaic power plant active power regulation method according to the present invention;

[0044] Figure 7 This is a schematic diagram of average strategy and non-average strategy power tracking in an embodiment of a photovoltaic power plant active power regulation method according to the present invention.

[0045] Figure 8 This is a schematic diagram of an embodiment of a photovoltaic power station active power regulation method according to the present invention.

[0046] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0047] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0048] Reference Figure 1 , Figure 1 This is a schematic diagram of the operating device of the hardware operating environment involved in the embodiments of the present invention.

[0049] like Figure 1As shown, the operating device may include: a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is used to enable communication between these components. The user interface 1003 may include a display screen or an input unit such as a keyboard; optionally, the user interface 1003 may also include a standard wired interface or a wireless interface. The network interface 1004 may optionally include a standard wired interface or a wireless interface (such as a Wi-Fi interface). The memory 1005 may be a high-speed random access memory (RAM) or a stable non-volatile memory (NVM), such as a disk drive. The memory 1005 may also optionally be a storage device independent of the aforementioned processor 1001.

[0050] Those skilled in the art will understand that Figure 1 The structure shown does not constitute a limitation on the operating equipment and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0051] like Figure 1 As shown, the memory 1005, which serves as a storage medium, may include an operating system, a data storage module, a network communication module, a user interface module, and computer programs.

[0052] exist Figure 1 In the illustrated operating device, the network interface 1004 is mainly used for data communication with other devices; the user interface 1003 is mainly used for data interaction with the user; the processor 1001 and memory 1005 in the operating device of the present invention can be installed in the operating device, and the operating device calls the computer program stored in the memory 1005 through the processor 1001 and performs the following operations:

[0053] Determine the weighting coefficients of each power generation unit within the photovoltaic power station;

[0054] The power to be allocated is determined based on the adjustment target power of the photovoltaic power station's active power and the current active power of the preset full-power unit;

[0055] The actual adjustment power of each power generation unit in the photovoltaic power station is determined based on the power to be allocated and the weighting coefficient, and the current active power of each power generation unit is adjusted to the actual adjustment power.

[0056] Furthermore, the processor 1001 can call a computer program stored in the memory 1005 and also perform the following operations:

[0057] The step of determining the weighting coefficients of each power generation unit within the photovoltaic power station includes:

[0058] Determine the current adjustment scenario corresponding to the target power, and determine historical similar days that are similar to the current adjustment scenario;

[0059] The weighting coefficient of each power generation unit in the photovoltaic power station is determined based on the similar daily power of each power generation unit in the photovoltaic power station on the historical similar days.

[0060] Furthermore, the processor 1001 can call a computer program stored in the memory 1005 and also perform the following operations:

[0061] The step of determining historical similar days that are similar to the current adjustment scenario includes:

[0062] Obtain the current electrical parameters and current environmental parameters under the current adjustment scenario;

[0063] Based on the current electrical parameters and the current environmental parameters, determine historical similar days that are similar to the current adjustment scenario.

[0064] Furthermore, the processor 1001 can call a computer program stored in the memory 1005 and also perform the following operations:

[0065] The step of determining the weighting coefficient of each power generation unit in the photovoltaic power station based on the similar daily power of each power generation unit in the photovoltaic power station on the historical similar days includes:

[0066] Based on the similar daily power of a preset fully-powered unit, the power ratio between the similar daily power of the preset fully-powered unit and the similar daily power of each other power generation unit in the photovoltaic power station other than the preset fully-powered unit is determined, and the power ratio is used as the weighting coefficient of each other power generation unit.

[0067] The weight coefficient of the preset full-output unit is 1.

[0068] Furthermore, the processor 1001 can call a computer program stored in the memory 1005 and also perform the following operations:

[0069] The step of determining the actual adjustable power of each power generation unit in the photovoltaic power station based on the power to be allocated and the weighting coefficient includes:

[0070] If the power generation unit is a preset full-power unit, then the actual adjustment power of the preset full-power unit is determined to be the current active power of the preset full-power unit.

[0071] Furthermore, the processor 1001 can call a computer program stored in the memory 1005 and also perform the following operations:

[0072] The step of determining the actual adjustable power of each power generation unit in the photovoltaic power station based on the power to be allocated and the weighting coefficient includes:

[0073] If the power generation unit is not a preset full-power unit, then the weight ratio between the weight coefficient of the non-preset full-power unit and the sum of the weight coefficients of all non-preset full-power units is determined, and the actual adjustment power of each power generation unit in the photovoltaic power station is determined according to the power to be allocated and the weight ratio corresponding to each power generation unit.

[0074] Furthermore, the processor 1001 can call a computer program stored in the memory 1005 and also perform the following operations:

[0075] Before the step of adjusting the current active power of each power generation unit to the actual adjusted power, the method further includes:

[0076] Determine the maximum adjustable active power of each power generation unit in the photovoltaic power station;

[0077] If the actual regulated power of each power generation unit is not greater than the corresponding maximum active power, then the step of adjusting the current active power of each power generation unit to the actual regulated power is executed.

[0078] Furthermore, the processor 1001 can call a computer program stored in the memory 1005 and also perform the following operations:

[0079] The step of determining the maximum adjustable active power of each power generation unit in the photovoltaic power station includes:

[0080] The maximum adjustable active power of each power generation unit in the photovoltaic power station is determined based on the current active power of the preset full-power unit and the weighting coefficient of each power generation unit.

[0081] Furthermore, the processor 1001 can call a computer program stored in the memory 1005 and also perform the following operations:

[0082] Before the step of determining the weighting coefficients of each power generation unit within the photovoltaic power station, the method further includes:

[0083] If the power regulation instruction corresponding to the active power regulation target power of the photovoltaic power station is an instruction to increase the active power of the photovoltaic power station, then the step of determining the weight coefficient of each power generation unit in the photovoltaic power station is executed.

[0084] Currently, most AGC commands issued to power generation units adopt an average allocation strategy, without considering the differences in power generation capacity among the units. This is partly because the power grid assessment mechanism has different requirements for positive and negative assessments of active power tracking target deviations; the assessment severity for tracking values ​​exceeding the target value is far greater than for tracking values ​​falling below the target value, meaning power loss has a certain acceptable level. On the other hand, tracking algorithms are mostly based on limited current operating data, making it difficult to assess the power generation capacity of power generation units. Given these reasons, some tracking control strategies shorten the single command closed-loop cycle and increase the adjustment frequency through communication methods to optimize the active power tracking control method for photovoltaic power plants. While this can reduce power generation losses to some extent, it does not fundamentally solve the problems caused by differences in power generation capacity among power generation units and the average allocation strategy. When power is limited (the target power of the photovoltaic power plant corresponding to the AGC command is reduced compared to the previous one), it is easy to quickly track the target value. However, when power is increased (the target power of the photovoltaic power plant corresponding to the AGC command is increased compared to the previous one), because the power generation capacity of each power generation unit is unknown, multiple corrections are needed before tracking the target value, obviously resulting in power generation losses.

[0085] Therefore, in this embodiment, when the AGC power is increased, the power generation capacity ranking of each power generation unit is obtained by sorting the historical power generation data of all power generation units under the AGC command; one of the power generation units is controlled to be a preset full-power unit and always operate at full power, and then the power generation capacity of each power generation unit is calculated based on the power generation capacity ranking; the active power tracking value (actual adjusted power) of each power generation unit is calculated based on the power generation capacity of each power generation unit and the AGC command target value (the adjustment target power of the photovoltaic power station's active power). This realizes a rapid adjustment method for the active power of a photovoltaic power station based on the power generation capacity assessment of the power generation unit, rejecting the average allocation of the tracking target, reducing the number of allocation corrections, and improving the power generation revenue of the photovoltaic power station.

[0086] Reference Figure 2 , Figure 2 This is a flowchart illustrating an embodiment of a photovoltaic power plant active power regulation method according to the present invention. This embodiment of the present invention provides a photovoltaic power plant active power regulation method, which includes the following steps:

[0087] Step S10: Determine the weighting coefficient of each power generation unit in the photovoltaic power station.

[0088] The photovoltaic power station can be a photovoltaic power station with significant differences in the output of its power generation units, such as a mountain photovoltaic power station; or it can be a photovoltaic power station with smaller differences in the output of its power generation units, unaffected by shading or other factors, such as a flatland photovoltaic power station. A photovoltaic power station typically contains multiple power generation units of different types, such as inverters or photovoltaic subarrays, each with a different power generation capacity. In this embodiment, a weighting coefficient is used to characterize the power generation capacity of a power generation unit. The larger the weighting coefficient, the stronger the power generation capacity of the corresponding power generation unit, and the more power generation capacity a power generation unit can or needs to be allocated.

[0089] Optionally, before the step of determining the weighting coefficients of each power generation unit within the photovoltaic power station, the method further includes:

[0090] If the power regulation instruction corresponding to the active power regulation target power of the photovoltaic power station is an instruction to increase the active power of the photovoltaic power station, then the step of determining the weight coefficient of each power generation unit in the photovoltaic power station is executed.

[0091] Before allocating the power generation of each power generation unit in the photovoltaic power station using a non-average allocation strategy, it is first determined whether the AGC active power command is an instruction to increase the active power of the photovoltaic power station. If it is an instruction to increase the active power of the photovoltaic power station, the allocation is carried out according to the non-average allocation strategy proposed in this embodiment; if it is an instruction to limit the active power of the photovoltaic power station, the allocation is carried out directly according to the average allocation strategy.

[0092] Step S20: Determine the power to be allocated based on the adjustment target power of the photovoltaic power station's active power and the current active power of the preset full-power unit.

[0093] The preset full-power unit is one of the pre-selected power generation units among all power generation units in the photovoltaic power station. In this embodiment, when using the non-average allocation strategy for power distribution, the preset full-power unit always maintains its active power at the start of the allocation process, operating at full capacity. Furthermore, the power generation unit with the largest power generation capacity among all power generation units in the photovoltaic power station is selected as the preset full-power unit, thereby reducing the actual regulation power allocated to the remaining power generation units, thus reducing power allocation errors and improving the accuracy of power allocation. Further, the target regulation power of the photovoltaic power station's active power is determined based on the received AGC active power command. The power to be allocated is determined by comparing the target regulation power with the current active power of the preset full-power unit, and the difference between the target regulation power and the current active power of the preset full-power unit is the power to be allocated.

[0094] Step S30: Determine the actual adjustment power of each power generation unit in the photovoltaic power station according to the power to be allocated and the weighting coefficient, and adjust the current active power of each power generation unit to the actual adjustment power.

[0095] When allocating the power to be allocated, the actual regulating power of each power generation unit in the photovoltaic power station is determined based on the power to be allocated and the weighting coefficient. The power to be allocated is then distributed with reference to the power generation capacity of each power generation unit other than the preset fully-powered units, thereby determining the actual regulating power of each power generation unit in the photovoltaic power station. The current active power of each power generation unit is adjusted to the actual regulating power, and each allocation unit is controlled to operate according to the allocated power generation capacity.

[0096] In this embodiment, the weighting coefficient of each power generation unit in the photovoltaic power station is determined; the power to be allocated is determined based on the adjustment target power of the active power of the photovoltaic power station and the current active power of the preset full-power unit; the actual adjustment power of each power generation unit in the photovoltaic power station is determined based on the power to be allocated and the weighting coefficient, and the current active power of each power generation unit is adjusted to the actual adjustment power.

[0097] First, the power to be allocated is determined based on the target power of the active power of the photovoltaic power station and the current active power of the preset full-power unit; then, the actual adjustment power of each power generation unit in the photovoltaic power station is determined based on the power to be allocated and the weight coefficient of each power generation unit in the photovoltaic power station; finally, the current active power of each power generation unit is adjusted to the actual adjustment power.

[0098] Compared to the average allocation strategy used in photovoltaic power plants with significant differences in the power generation capacity of individual units, which requires multiple adjustments to the power generation capacity and active power of each unit, ensuring that the preset fully-powered unit always operates at full capacity, and calculating the actual adjusted power of each unit based on its power generation capacity and the power to be allocated, this approach proposes a non-average allocation strategy. This strategy fixes the preset fully-powered unit from participating in power limiting control, uses the preset fully-powered unit as a benchmark to solve for the power generation capacity of the remaining units, and formulates an allocation scheme for the power to be allocated based on this capacity, distributing the power to be allocated to the remaining units. This reduces the number of allocation corrections (reducing the allocation to one) when adjusting the power generation of the photovoltaic power plant, accurately, quickly, and reasonably allocating the power generation capacity of each unit within the photovoltaic power plant, tracking the target power of the photovoltaic power plant, significantly reducing the power generation losses caused by the average allocation scheme requiring multiple adjustments, and improving the power generation revenue of the photovoltaic power plant.

[0099] In another embodiment of the active power regulation method for a photovoltaic power station provided by the present invention, the step of determining the weight coefficient of each power generation unit in the photovoltaic power station includes:

[0100] Determine the current adjustment scenario corresponding to the target power, and determine historical similar days that are similar to the current adjustment scenario;

[0101] The weighting coefficient of each power generation unit in the photovoltaic power station is determined based on the similar daily power of each power generation unit in the photovoltaic power station on the historical similar days.

[0102] The current regulation scenario refers to the electrical and environmental environment in which the photovoltaic (PV) power station operates when it receives an AGC (Automatic Generation Control) active power command to increase the active power of the PV power station to the target regulation power. By determining the similar historical dates in the current regulation scenario based on the electrical and environmental scenarios, and then determining the weighting coefficients of each power generation unit within the PV power station based on the similar daily power of each power generation unit on those historical similar dates, different regulation scenarios correspond to different historical similar dates, and different regulation scenarios correspond to different weighting coefficients for the power generation units.

[0103] Optionally, the step of determining historical similar days similar to the current adjustment scenario includes:

[0104] Obtain the current electrical parameters and current environmental parameters under the current adjustment scenario;

[0105] Based on the current electrical parameters and the current environmental parameters, determine historical similar days that are similar to the current adjustment scenario.

[0106] The current electrical parameters under the current regulation scenario include, but are not limited to, current and power generation. The current environmental parameters under the current regulation scenario include, but are not limited to, time, temperature and irradiance. Based on the data of the current electrical parameters and the current environmental parameters, historical similar days similar to the current regulation scenario are found. The similarity determination method is mostly through multidimensional data Euclidean distance or other clustering algorithms. In this embodiment, the method for determining historical similar days similar to the current regulation scenario is not limited.

[0107] Optionally, the step of determining the weighting coefficient of each power generation unit in the photovoltaic power station based on the similar daily power of each power generation unit in the photovoltaic power station on the historical similar days includes:

[0108] Based on the similar daily power of a preset fully-powered unit, the power ratio between the similar daily power of the preset fully-powered unit and the similar daily power of each other power generation unit in the photovoltaic power station other than the preset fully-powered unit is determined, and the power ratio is used as the weighting coefficient of each other power generation unit.

[0109] The weight coefficient of the preset full-output unit is 1.

[0110] After determining the historical similar days, the similar daily power of each power generation unit in the photovoltaic power station on the historical similar days can be obtained. First, based on the similar daily power of the preset full-power unit, the weight coefficient of the preset full-power unit is set to 1, that is, the preset full-power unit is set as a unit that always generates power at full power; then, the power ratio between the similar daily power of the preset full-power unit and the similar daily power of each other power generation unit is determined, and the calculated power ratio is used as the weight coefficient of each other power generation unit.

[0111] In this embodiment, the average allocation strategy of conventional AGC active power commands is optimized and improved to achieve the goal of reducing the number of adjustments and achieving rapid tracking. Because photovoltaic power output is a typical intermittent energy source, it is strongly correlated with weather conditions and exhibits significant fluctuations. Therefore, the challenge lies in determining the allocation value for the power generation capacity of each generating unit at the current moment during non-average allocation. To address this challenge, a strategy is proposed to solve for the power allocation value of each generating unit based on historical power generation data from similar days and a strategy of ensuring that each unit is always operating at full capacity. That is, upon receiving an AGC power increase command, a non-average allocation scheme is adopted to achieve rapid adjustment of active power. The determination of the non-average allocation scheme mainly includes: determining the conversion weight of the power generation capacity of each generating unit based on historical power generation data; fixing that a single generating unit does not participate in power limiting control, using this generating unit as a benchmark to solve for the power generation capacity of each generating unit, and formulating an AGC command allocation scheme based on the power generation capacity. Therefore, the weighting of the power generation capacity assessment based on the historical power generation data of the power generation unit is more accurate and reasonable than assessment based solely on instantaneous power. By controlling each power generation unit to always operate at full capacity, the current power generation capacity of each power generation unit can be obtained through the weighting method. The non-average allocation strategy can effectively reduce the initial tracking error and the number of adjustments, thereby reducing power tracking loss. Moreover, the non-average allocation strategy is an optimized power allocation scheme with no hardware cost and no risk of tracking failure, resulting in a significant improvement in power generation over a long period.

[0112] In another embodiment of the active power regulation method for a photovoltaic power station provided by the present invention, the step of determining the actual regulation power of each power generation unit in the photovoltaic power station based on the power to be allocated and the weighting coefficient includes:

[0113] If the power generation unit is a preset full-power unit, then the actual adjustment power of the preset full-power unit is determined to be the current active power of the preset full-power unit.

[0114] In this embodiment, the power generation units in the photovoltaic power station are divided into preset full-power units and other non-full-power units. Different power generation units correspond to different regulation strategies and are set with different actual regulation powers. When determining the actual regulation power of each power generation unit in the photovoltaic power station based on the power to be allocated and the weighting coefficient, if the power generation unit to be regulated is a preset full-power unit, the current active power of the preset full-power unit is determined when the power regulation command is received, and the actual regulation power of the preset full-power unit is set as the current active power of the preset full-power unit. Thus, in the process of regulating the active power of the photovoltaic power station to reach the regulation target power of the photovoltaic power station, the current active power of the preset full-power unit is kept unchanged, with the preset full-power unit as the regulation benchmark.

[0115] Optionally, the step of determining the actual adjustable power of each power generation unit in the photovoltaic power station based on the power to be allocated and the weighting coefficient includes:

[0116] If the power generation unit is not a preset full-power unit, then the weight ratio between the weight coefficient of the non-preset full-power unit and the sum of the weight coefficients of all non-preset full-power units is determined, and the actual adjustment power of each power generation unit in the photovoltaic power station is determined according to the power to be allocated and the weight ratio corresponding to each power generation unit.

[0117] When determining the actual adjustable power of each power generation unit in a photovoltaic power station based on the power to be allocated and the weighting coefficient, if the power generation unit to be adjusted is one of the remaining power generation units that are not preset to full capacity, it is necessary to first determine the weight ratio between the weighting coefficient of the non-preset full capacity unit and the sum of the weighting coefficients of all non-preset full capacity units, and then determine the actual adjustable power of each power generation unit in the photovoltaic power station based on the power to be allocated and the corresponding weighting ratio of each power generation unit. In this embodiment, the following formula is proposed for the allocation method of the power to be allocated and the method for determining the actual adjustable power:

[0118]

[0119] Among them, P i P1 represents the actual adjustable power of each power generation unit within the photovoltaic power station (taking the first power generation unit as an example), P represents the target power for adjusting the active power of the photovoltaic power station, P-P1 represents the power to be allocated, and K represents the actual adjustable power of the preset full-power unit. i This represents the weighting coefficient of each power generation unit within the photovoltaic power station. This is the sum of the weighting coefficients for all non-preset full-output units.

[0120] In this embodiment, a non-average allocation strategy is proposed. A preset fully-powered unit is excluded from power limiting control. The power generation capacity of the remaining units is calculated based on this preset fully-powered unit, and an allocation scheme for the power to be allocated is formulated according to this capacity, distributing the power to be allocated to the remaining units. This reduces the number of allocation corrections (reducing the allocation to one) when adjusting the photovoltaic power plant's output. It accurately, quickly, and reasonably allocates the power generation capacity of each unit within the photovoltaic power plant, tracks the target power of the photovoltaic power plant, significantly reduces power generation losses caused by multiple adjustments required by the average allocation scheme, and improves the power generation revenue of the photovoltaic power plant.

[0121] In another embodiment of the active power regulation method for a photovoltaic power station provided by the present invention, before the step of regulating the current active power of each power generation unit to the actual regulated power, the method further includes:

[0122] Determine the maximum adjustable active power of each power generation unit in the photovoltaic power station;

[0123] If the actual regulated power of each power generation unit is not greater than the corresponding maximum active power, then the step of adjusting the current active power of each power generation unit to the actual regulated power is executed.

[0124] In the actual operation of a photovoltaic power station, various parameters in the formulas for the allocation method of the power to be allocated and the determination method of the actual regulating power may be incorrect. For example, the actual regulating power of the preset full-power unit may be incorrect due to data acquisition errors, the regulating target power of the photovoltaic power station may be incorrect due to transmission or determination errors, and the weight coefficients of each power generation unit in the photovoltaic power station may be incorrect due to errors in determining the historical similar days or similar day power. All these factors can lead to errors in the calculated actual regulating power.

[0125] Therefore, before calculating the actual adjustable power to be allocated to each power generation unit and adjusting the current active power of each power generation unit to the actual adjustable power, it is necessary to determine whether the actual adjustable power exceeds the theoretical upper limit of the adjustable power of each power generation unit, i.e., the maximum active power. If the actual adjustable power exceeds the current adjustable maximum active power of each power generation unit, and the current active power of each power generation unit is still adjusted to the actual adjustable power under this condition, then each power generation unit will need to be maintained at the maximum power generation condition for a long time, which may cause irreversible damage or unpredictable problems to the power generation unit. Furthermore, the current active power of each power generation unit also needs to be determined to be no greater than the corresponding maximum active power. Through the above settings, it is possible to avoid various possible reasons causing the power generation units in the photovoltaic power station to be in an abnormal overload operation state, thus ensuring its safe operation.

[0126] Optionally, the step of determining the maximum adjustable active power of each power generation unit in the photovoltaic power station includes:

[0127] The maximum adjustable active power of each power generation unit in the photovoltaic power station is determined based on the current active power of the preset full-power unit and the weighting coefficient of each power generation unit.

[0128] In this embodiment, a method is proposed to determine the maximum adjustable active power of each power generation unit in a photovoltaic power station. This method determines the maximum adjustable active power of each power generation unit in the photovoltaic power station by pre-setting the current active power of a fully powered unit and the weighting coefficient of each unit.

[0129] Pmax i =P1*K i , i∈[2,N]

[0130] Wherein, Pmax i P1 represents the maximum adjustable active power of each power generation unit within the photovoltaic power station, P1 represents the actual adjustable power of the preset fully-powered unit, and K represents the maximum adjustable active power. i This represents the weighting coefficient of each power generation unit within the photovoltaic power station.

[0131] Therefore, even in the most extreme case, if the actual adjustment power and weighting coefficient of the preset full-power unit are wrong, it can prevent the power generation units in the photovoltaic power station from being in an abnormal overload state due to the error in the adjustment target power of the active power of the photovoltaic power station, thus ensuring its safe operation.

[0132] Reference Figure 3 , Figure 3 This is a schematic diagram illustrating an embodiment of the active power regulation method for a photovoltaic power station according to the present invention. The main contents of this embodiment include:

[0133] Step 1: Obtain the target value P of the AGC active power command (the adjustment target power of the photovoltaic power station's active power);

[0134] Step 2: Determine if it is a boost command (a command to boost the active power of the photovoltaic power station). If it is not a boost command, implement the average distribution strategy. If it is a boost command, proceed to Step 3.

[0135] Step 3: Based on the current electrical parameters and environmental parameters under the current adjustment scenario, find historically similar days;

[0136] Step 4: Using the preset full-power unit as a benchmark, calculate the weighting coefficient K of each power generation unit within similar historical days. i ;

[0137] Step 5: Based on the current active power P1 of the preset full-capacity generating unit and the weighting coefficient K of each generating unit. i Solve for the maximum adjustable active power Pmax of each power generation unit at the current moment. i ;

[0138] Step 6: Based on the command target value (adjust target power) P, the preset full-power unit's actual adjusted power P1, and the weighting coefficient K... i Calculate the power allocation value (actual regulating power of each power generation unit) P for each power generation unit. i And ensure that the actual regulating power of each power generation unit does not exceed the corresponding maximum active power Pmax. i .

[0139] To verify the rationality of the non-average distribution strategy during power boosting in this embodiment, a photovoltaic power station is used as an example for calculation to determine the reduction in power generation loss compared to the average distribution scheme. The photovoltaic power station has a total of 8 power generation units. At a certain moment, a power boosting command is issued, with a command target value (adjustment target power) P = 575kW.

[0140] Reference Figures 4 to 7 Taking power generation unit 1 and power generation unit 2 as examples, the current power of power generation unit 1 is 39.23 (units ignored), and the similar daily power is 36.86. The current power of power generation unit 2 is 69.46, and the similar daily power is 66.38. Therefore, the conversion factor for power generation unit 2 is determined to be 66.38 ÷ 36.86 ≈ 1.8, and the current active power of power generation unit 2 is determined to be 39.23 × 1.8 ≈ 70.61. Based on the allocation method of the power to be allocated and the formula of the actual adjustment power determination method proposed in the above embodiment, the power allocation value of power generation unit 2 is calculated to be 69.78 < 70.61. Therefore, the power allocation value of 69.78 is taken as the actual adjustment power of power generation unit 2, and the current active power of power generation unit 2 is adjusted from 69.46 to 69.78. Figure 7 The horizontal axis represents the number of adjustments, and the vertical axis represents the target power P. The current target power P is represented by the thick straight line, 575. The three-line diagram in the lower right represents the power ramp-up state under the average distribution strategy, and the thin straight line in the upper left represents the power ramp-up state under the non-average distribution strategy in this embodiment. Figure 7 It can be seen that the photovoltaic power plant active power rapid adjustment method based on the power generation capacity of the power generation units can reach the target value P in one tracking cycle, compared with the traditional average distribution method, while the average distribution strategy requires three cycles of tracking and adjustment to reach the target value P. Therefore, this embodiment can achieve faster tracking and significantly reduce the power generation loss caused by the average distribution strategy when multiple adjustments are required. The loss reduction effect is particularly significant when the power generation capacity of each power generation unit differs greatly.

[0141] In addition, refer to Figure 8 This invention also provides a photovoltaic power plant active power regulation device, the photovoltaic power plant active power regulation device comprising:

[0142] The weighting coefficient determination module M1 is used to determine the weighting coefficient of each power generation unit in the photovoltaic power station;

[0143] The power to be allocated module M2 is used to determine the power to be allocated based on the adjustment target power of the active power of the photovoltaic power station and the current active power of the preset full-power unit.

[0144] The actual adjustment power determination module M3 is used to determine the actual adjustment power of each power generation unit in the photovoltaic power station based on the power to be allocated and the weighting coefficient, and adjust the current active power of each power generation unit to the actual adjustment power.

[0145] Optionally, the weighting coefficient determination module is further configured to determine the current adjustment scenario corresponding to the adjustment target power, and to determine historical similar days similar to the current adjustment scenario;

[0146] The weighting coefficient of each power generation unit in the photovoltaic power station is determined based on the similar daily power of each power generation unit in the photovoltaic power station on the historical similar days.

[0147] Optionally, the weighting coefficient determination module is also used to obtain the current electrical parameters and current environmental parameters under the current adjustment scenario;

[0148] Based on the current electrical parameters and the current environmental parameters, determine historical similar days that are similar to the current adjustment scenario.

[0149] Optionally, the weighting coefficient determination module is further configured to determine the power ratio between the similar daily power of the preset full-power unit and the similar daily power of each other power generation unit in the photovoltaic power station other than the preset full-power unit, based on the similar daily power of the preset full-power unit, and use the power ratio as the weighting coefficient of each other power generation unit.

[0150] The weight coefficient of the preset full-output unit is 1.

[0151] Optionally, the actual adjustment power determination module is further configured to determine the actual adjustment power of the preset full-power unit as the current active power of the preset full-power unit if the power generation unit is a preset full-power unit.

[0152] Optionally, the actual adjustment power determination module is further configured to, if the power generation unit is not a preset full-power unit, determine the weight ratio between the weight coefficient of the non-preset full-power unit and the sum of the weight coefficients of all non-preset full-power units, and determine the actual adjustment power of each power generation unit in the photovoltaic power station according to the power to be allocated and the weight ratio corresponding to each power generation unit.

[0153] Optionally, the actual adjustable power determination module is also used to determine the maximum adjustable active power of each power generation unit in the photovoltaic power station.

[0154] If the actual regulated power of each power generation unit is not greater than the corresponding maximum active power, then the step of adjusting the current active power of each power generation unit to the actual regulated power is executed.

[0155] Optionally, the actual adjustable power determination module is further configured to determine the maximum adjustable active power of each power generation unit in the photovoltaic power station based on the current active power of the preset full-power unit and the weighting coefficient of each power generation unit.

[0156] Optionally, the active power regulation device of the photovoltaic power station further includes an instruction judgment module, which is used to execute the step of determining the weight coefficient of each power generation unit in the photovoltaic power station if the power regulation instruction corresponding to the adjustment target power of the active power of the photovoltaic power station is an instruction to increase the active power of the photovoltaic power station.

[0157] The photovoltaic power plant active power regulation device provided by this invention adopts the photovoltaic power plant active power regulation method in the above embodiments, solving the technical problem in the prior art that it is difficult to accurately and quickly allocate the power generation of each power generation unit in a photovoltaic power plant when regulating the power generation of the photovoltaic power plant. Compared with the prior art, the beneficial effects of the photovoltaic power plant active power regulation device provided by this invention are the same as the beneficial effects of the photovoltaic power plant active power regulation method provided in the above embodiments, and other technical features in this photovoltaic power plant active power regulation device are the same as the features disclosed in the method of the above embodiments, and will not be repeated here.

[0158] Furthermore, this embodiment of the invention also provides a photovoltaic power plant active power regulation device, which includes: a memory, a processor, and a computer program stored in the memory and executable on the processor. The computer program is configured to implement the steps of the photovoltaic power plant active power regulation method described above.

[0159] Furthermore, embodiments of the present invention also provide a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the photovoltaic power plant active power regulation method as described above.

[0160] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0161] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0162] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0163] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A method for regulating the active power of a photovoltaic power station, characterized in that, The active power regulation method for the photovoltaic power station includes the following steps: Determine the weighting coefficients of each power generation unit within the photovoltaic power station; The power to be allocated is determined based on the adjustment target power of the photovoltaic power station's active power and the current active power of the preset full-power unit; The actual adjustment power of each power generation unit in the photovoltaic power station is determined based on the power to be allocated and the weighting coefficient, and the current active power of each power generation unit is adjusted to the actual adjustment power. The step of determining the weighting coefficients of each power generation unit within the photovoltaic power station includes: Determine the current adjustment scenario corresponding to the target power, and determine historical similar days that are similar to the current adjustment scenario; The weighting coefficient of each power generation unit in the photovoltaic power station is determined based on the similar daily power of each power generation unit in the photovoltaic power station on the historical similar days. The step of determining the weighting coefficient of each power generation unit in the photovoltaic power station based on the similar daily power of each power generation unit in the photovoltaic power station on the historical similar days includes: Based on the similar daily power of a preset fully-powered unit, the power ratio between the similar daily power of the preset fully-powered unit and the similar daily power of each other power generation unit in the photovoltaic power station other than the preset fully-powered unit is determined, and the power ratio is used as the weighting coefficient of each other power generation unit. The weight coefficient of the preset full-output unit is 1.

2. The active power regulation method for a photovoltaic power station as described in claim 1, characterized in that, The step of determining historical similar days that are similar to the current adjustment scenario includes: Obtain the current electrical parameters and current environmental parameters under the current adjustment scenario; Based on the current electrical parameters and the current environmental parameters, determine historical similar days that are similar to the current adjustment scenario.

3. The active power regulation method for a photovoltaic power station as described in claim 1, characterized in that, The step of determining the actual adjustable power of each power generation unit in the photovoltaic power station based on the power to be allocated and the weighting coefficient includes: If the power generation unit is a preset full-power unit, then the actual adjustment power of the preset full-power unit is determined to be the current active power of the preset full-power unit.

4. The active power regulation method for a photovoltaic power station as described in claim 1, characterized in that, The step of determining the actual adjustable power of each power generation unit in the photovoltaic power station based on the power to be allocated and the weighting coefficient includes: If the power generation unit is not a preset full-power unit, then the weight ratio between the weight coefficient of the non-preset full-power unit and the sum of the weight coefficients of all non-preset full-power units is determined, and the actual adjustment power of each power generation unit in the photovoltaic power station is determined according to the power to be allocated and the weight ratio corresponding to each power generation unit.

5. The active power regulation method for a photovoltaic power station as described in claim 1, characterized in that, Before the step of adjusting the current active power of each power generation unit to the actual adjusted power, the method further includes: Determine the maximum adjustable active power of each power generation unit in the photovoltaic power station; If the actual regulated power of each power generation unit is not greater than the corresponding maximum active power, then the step of adjusting the current active power of each power generation unit to the actual regulated power is executed.

6. The active power regulation method for a photovoltaic power station as described in claim 5, characterized in that, The step of determining the maximum adjustable active power of each power generation unit in the photovoltaic power station includes: The maximum adjustable active power of each power generation unit in the photovoltaic power station is determined based on the current active power of the preset full-power unit and the weighting coefficient of each power generation unit.

7. The active power regulation method for a photovoltaic power station as described in claim 1, characterized in that, Before the step of determining the weighting coefficients of each power generation unit within the photovoltaic power station, the method further includes: If the power regulation instruction corresponding to the active power regulation target power of the photovoltaic power station is an instruction to increase the active power of the photovoltaic power station, then the step of determining the weight coefficient of each power generation unit in the photovoltaic power station is executed.

8. A photovoltaic power station active power regulation device, characterized in that, The active power regulation device for the photovoltaic power station includes: The weighting coefficient determination module is used to determine the weighting coefficient of each power generation unit in the photovoltaic power station; The power to be allocated module is used to determine the power to be allocated based on the adjustment target power of the active power of the photovoltaic power station and the current active power of the preset full-power unit; The actual adjustment power determination module is used to determine the actual adjustment power of each power generation unit in the photovoltaic power station based on the power to be allocated and the weighting coefficient, and adjust the current active power of each power generation unit to the actual adjustment power. The weight coefficient determination module is also used to determine the current adjustment scenario corresponding to the adjustment target power, and to determine the historical similar days similar to the current adjustment scenario; and to determine the weight coefficient of each power generation unit in the photovoltaic power station based on the similar day power of each power generation unit in the photovoltaic power station on the historical similar days. The weighting coefficient determination module is further configured to determine the power ratio between the similar daily power of the preset full-power unit and the similar daily power of each other power generation unit in the photovoltaic power station other than the preset full-power unit, based on the similar daily power of the preset full-power unit, and use the power ratio as the weighting coefficient of each other power generation unit; wherein, the weighting coefficient of the preset full-power unit is 1.

9. A photovoltaic power station active power regulation device, characterized in that, The photovoltaic power plant active power regulation device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the photovoltaic power plant active power regulation method as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the steps of the photovoltaic power plant active power regulation method as described in any one of claims 1 to 7.

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