A distributed photovoltaic power station power distribution method, system, device and medium

Abstract

The application relates to a distributed photovoltaic power station power distribution method, system, device and medium. The power regulation equipment is screened through a locking sign, so that only the equipment which is not locked and has actual regulation capacity participates in power distribution, and the problem that an invalid equipment is instructed is avoided. Meanwhile, the equipment with a large adjustable margin is preferentially arranged to undertake a regulation task through real-time adjustable margin descending order sorting and greedy iteration distribution, and the iteration is terminated immediately after total regulation amount distribution is completed, so that the regulation and control target is completed with as few equipment action times as possible, frequent small regulation of multiple equipment caused by full equipment participation is avoided, the switching action frequency of a power device of a photovoltaic inverter and a static var generator is effectively reduced, device loss is reduced, the service life of the equipment is prolonged, and the execution efficiency and accuracy of the power regulation and control of the power station are improved.

Description

Technical Field

[0001] This application belongs to the field of power system automatic control technology, and in particular relates to a method, system, equipment and medium for power distribution of distributed photovoltaic power plants. Background Technology

[0002] Distributed photovoltaic (PV) power plants typically require automatic generation control (AGC) and automatic voltage var control (AVC) systems to coordinate the active and reactive power output of power regulation equipment such as PV inverters and static var generators. Unlike traditional power sources such as hydropower and thermal power, PV power plants are characterized by equipment types concentrated in inverters and static var generators, and their output is significantly affected by natural conditions such as irradiance and temperature. Therefore, their AGC / AVC control faces unique technical challenges.

[0003] Existing AGC / AVC power allocation methods for photovoltaic power plants, whether based on proportional allocation according to equipment capacity, priority allocation based on prototypes, or optimal working area allocation aimed at minimizing grid losses, all tend to involve as many devices as possible in power regulation, i.e., an allocation logic of "full equipment participation." However, the physical characteristics of the power devices in photovoltaic inverters and static var generators mean that frequent small-amplitude movements are more likely to cause device damage and shorten equipment lifespan than occasional large-amplitude movements. In addition, the existing allocation process lacks effective linkage with the safety lockout status of the equipment, which can easily lead to situations where commands are issued to locked-out or non-regulating equipment, resulting in the ineffective execution of control commands.

[0004] It is worth noting that existing solutions in the wind power sector attempt to avoid issuing commands to equipment without regulation capabilities by calculating the effective reactive power capacity of wind turbines. However, assessing the power regulation capability of photovoltaic (PV) power plants faces entirely different technical challenges: the adjustability margin of PV inverters is not only affected by the equipment's own condition but is also strongly correlated with PV-specific parameters such as real-time irradiance, DC-side voltage, and module temperature; minute-level abrupt changes in irradiance can cause drastic changes in the equipment's adjustability margin within a short period, a unique problem not encountered in the wind power sector. Therefore, existing solutions in the wind power sector cannot be directly transferred to PV scenarios.

[0005] Therefore, how to achieve effective power distribution in photovoltaic scenarios, while avoiding the involvement of all equipment and reducing redundant actions, in conjunction with the unique operating parameters and actual adjustable state of photovoltaic equipment, is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0006] The purpose of this application is to provide a power allocation method, system, device, and medium for distributed photovoltaic (PV) power plants. The power allocation method, system, device, and medium provided in this application screen power regulation devices using a blocking flag to ensure that only devices that are not blocked and have actual regulation capabilities participate in power allocation, avoiding issuing commands to invalid devices. Simultaneously, by sorting devices in descending order of real-time adjustable margin and performing greedy iterative allocation, devices with larger adjustable margins are given priority to undertake regulation tasks, and the iteration terminates immediately after the total regulation amount is allocated. This achieves the regulation target with as few device actions as possible, avoiding frequent small-scale adjustments by multiple devices due to the participation of all devices.

[0007] This application provides a method for power allocation in a distributed photovoltaic power station, including: Obtain the lockout flag of each power regulation device in the corresponding regulation direction, and the real-time adjustable margin of each power regulation device in the corresponding regulation direction; Based on the lockout flag, select the power regulation devices whose corresponding adjustment direction is not locked to form an effective device set; The power regulation devices in the effective device set are sorted in descending order of the real-time adjustable margin to generate a greedy allocation sequence; Obtain the total adjustment amount and assign the total adjustment amount to the current remaining adjustment amount; Based on the current remaining adjustment amount and the real-time adjustable margin of each power adjustment device in the greedy allocation sequence, iterative allocation is performed according to the greedy allocation sequence. In each iteration, the smaller value between the adjustable margin of the power adjustment device in the current round and the current remaining adjustment amount is taken as the adjustment amount allocated to the power adjustment device in this round, and the current remaining adjustment amount is updated based on the adjustment amount. The iteration terminates when the current remaining adjustment amount meets the preset termination condition, and the target adjustment amount of each power adjustment device is output according to the adjustment amount allocated in each round.

[0008] Optionally, the power regulation device includes a photovoltaic inverter and / or a static var generator.

[0009] Optionally, the interlocking flags include active power increase interlocking flags, active power decrease interlocking flags, reactive power increase interlocking flags, and reactive power decrease interlocking flags.

[0010] Optionally, the locking flag is generated using at least one of the following criteria: Instruction-level criteria include target instruction value exceeding limits, instruction mutation, and / or instruction dead zone oscillation; Equipment-level criteria include abnormal DC-side voltage of photovoltaic inverter, sudden change in photovoltaic irradiance, attenuation of temperature drift capability of static var generator, real-time adjustable margin of power regulation equipment in the corresponding regulation direction being less than the preset regulation dead zone, equipment failure and / or equipment not configured to participate in the corresponding type of regulation. System-level criteria include abnormal grid connection point voltage, abnormal frequency, excessive grid connection point power change rate, and / or interruption of communication with dispatch. User-level criteria include user-defined locking conditions, which are determined based on the relationship between the telemetry data of the power regulation device and a preset threshold.

[0011] Optionally, For the photovoltaic inverter, the real-time adjustable margin includes active power upward adjustment margin, active power downward adjustment margin, reactive power upward adjustment margin, and reactive power downward adjustment margin. For the static var generator, the real-time adjustable margin includes reactive power upward adjustment margin and reactive power downward adjustment margin.

[0012] Optionally, The active power adjustment margin is obtained based on the rated capacity, theoretical active power, prediction offset coefficient, time decay coefficient, real-time active power, and active power adjustment dead zone of the photovoltaic inverter. The prediction offset coefficient is obtained based on the deviation between the actual active power and the predicted active power over multiple control cycles, and the time decay coefficient is obtained based on the ratio of the time from the start of the prediction period to the prediction cycle. The active power down-adjustment margin is obtained based on the real-time active power and active power adjustment dead zone of the photovoltaic inverter. The reactive power up-adjustment margin and reactive power down-adjustment margin of the photovoltaic inverter are obtained based on the real-time reactive power limit, predicted reactive power limit, real-time reactive power, and reactive power adjustment dead zone of the photovoltaic inverter. The real-time reactive power limit is obtained based on the rated capacity and real-time active power of the photovoltaic inverter, and the predicted reactive power limit is obtained based on the rated capacity of the photovoltaic inverter, the predicted active power of the current prediction period, and the prediction offset coefficient.

[0013] Optionally, The reactive power up-adjustment margin and reactive power down-adjustment margin of the static var generator are obtained based on the rated capacity, real-time reactive power, reactive power adjustment dead zone, and operating temperature correction coefficient of the static var generator. The operating temperature correction coefficient is determined based on the real-time operating temperature of the static var generator.

[0014] This application also provides a distributed photovoltaic power distribution system, including: The equipment information acquisition module is used to acquire the lockout flag of each power adjustment device in the corresponding adjustment direction, and the real-time adjustable margin of each power adjustment device in the corresponding adjustment direction. The filtering module is used to filter out the power regulation devices whose corresponding adjustment direction is not locked according to the lockout flag, so as to form a valid device set; The sorting module is used to sort the power regulation devices in the effective device set in descending order of the real-time adjustable margin, and generate a greedy allocation sequence. The adjustment amount acquisition module is used to acquire the total adjustment amount and assign the total adjustment amount to the current remaining adjustment amount. The allocation module is used to iteratively allocate power regulation according to the current remaining adjustment amount and the real-time adjustable margin of each power regulation device in the greedy allocation sequence. In each iteration, the smaller value between the adjustable margin of the power regulation device in the current round and the current remaining adjustment amount is used as the adjustment amount allocated to the power regulation device in this round, and the current remaining adjustment amount is updated according to the adjustment amount. The output module is used to terminate the iteration when the current remaining adjustment amount meets the preset termination condition, and output the target adjustment amount of each power adjustment device according to the adjustment amount allocated in each round.

[0015] This application also provides a distributed photovoltaic power distribution device, including: a processor and a memory; The memory is used to store the power allocation processing program for the distributed photovoltaic power station; The processor is configured to execute the distributed photovoltaic power distribution processing program to implement the steps of the distributed photovoltaic power distribution method as described in any of the above embodiments.

[0016] This application also provides a computer-readable storage medium storing computer-executable instructions, which, when loaded and executed by a processor, implement the steps of the distributed photovoltaic power distribution method as described in any of the above claims.

[0017] Compared with existing technologies, this application provides a distributed photovoltaic power allocation method, system, device, and medium. By acquiring the blocking flags for each power regulation device in its corresponding regulation direction, and the real-time adjustable margin of each power regulation device in that direction, the system filters out power regulation devices that are not blocked in their respective regulation directions based on the blocking flags, forming an effective device set. The power regulation devices in the effective device set are then sorted in descending order of their real-time adjustable margins to generate a greedy allocation sequence. The total adjustment amount is obtained and assigned to the current remaining adjustment amount. Based on the current remaining adjustment amount and the real-time adjustable margins of each power regulation device in the greedy allocation sequence, iterative allocation is performed according to the greedy allocation sequence. In each iteration, the smaller value between the adjustable margin of the current power regulation device and the current remaining adjustment amount is used as the adjustment amount allocated to that power regulation device in that round. The system updates the remaining adjustment amount based on this adjustment amount. The iteration terminates when the remaining adjustment amount meets the preset termination condition. Based on the adjustment amount allocated in each round, the target adjustment amount for each power adjustment device is output. In this application, power adjustment devices are screened by a blocking flag to ensure that only devices that are not blocked and have actual adjustment capabilities participate in power allocation, avoiding issuing instructions to invalid devices. At the same time, by sorting in descending order of real-time adjustable margin and performing greedy iterative allocation, devices with large adjustable margins are given priority to undertake adjustment tasks. The iteration terminates immediately after the total adjustment amount is allocated, thereby completing the control target with as few device actions as possible. This avoids frequent small adjustments by multiple devices due to the participation of all devices, effectively reducing the switching frequency of power devices in photovoltaic inverters and static var generators, reducing device losses, extending equipment lifespan, and improving the execution efficiency and accuracy of power control in the power plant. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a flowchart of a distributed photovoltaic power allocation method disclosed in an embodiment of this application; Figure 2 This is a structural block diagram of a distributed photovoltaic power distribution system disclosed in an embodiment of this application; Figure 3 This is a schematic diagram of the structure of a distributed photovoltaic power distribution device disclosed in an embodiment of this application. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly set on the other component; when a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to the other component.

[0022] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0023] like Figure 1 As shown in the figure, this application provides a method for power allocation in a distributed photovoltaic power station, including: S1. Obtain the lockout flag of each power regulation device in the corresponding regulation direction, and the real-time adjustable margin of each power regulation device in the corresponding regulation direction. In this embodiment, the lockout flag indicates whether the power regulation device is prohibited from participating in power regulation in a specific regulation direction. Each power regulation device corresponds to one or more regulation directions, which include at least one of the following: active power upward regulation direction, active power downward regulation direction, reactive power upward regulation direction, and reactive power downward regulation direction. If a power regulation device is locked in a certain regulation direction, the device should not be assigned any regulation amount in that direction. The real-time adjustable margin indicates the maximum regulation amount that the power regulation device can actually undertake at the current moment in the corresponding regulation direction, reflecting the device's real-time regulation capability.

[0024] The blocking flag and real-time adjustable margin can be obtained by reading from the site monitoring system or equipment management system, or by acquiring them in real time through the communication interface with each power regulation device.

[0025] By simultaneously acquiring the interlocking status and adjustability margin of each device in each direction, a complete data foundation is provided for subsequent device selection and power allocation, enabling the allocation process to make decisions based on the latest actual status of the devices.

[0026] S2. Based on the interlocking flag, select the power regulating devices that are not interlocked in the corresponding regulating direction to form a valid set of devices; In this embodiment, after obtaining the lockout flag of each power regulation device, for the current regulation direction to be executed, the lockout flag is used as the filtering condition to filter out the devices whose lockout flag is false (i.e. not locked) in the regulation direction from all power regulation devices, thus forming a valid device set.

[0027] The specific filtering logic is as follows: if the lockout flag of a certain power regulation device is true in the current regulation direction, then the device is excluded from the set of valid devices; otherwise, if the lockout flag is false, then the device is included in the set of valid devices.

[0028] This screening process ensures that each device participating in power distribution has the actual adjustable capability under the current conditions in the adjustment direction, thus preventing control failure caused by issuing adjustment commands to the interlocking device and preventing safety impacts on the interlocking device due to misoperation.

[0029] S3. Sort the power regulation devices in the effective device set in descending order of real-time adjustable margin to generate a greedy allocation sequence; In this embodiment, each power regulation device in the effective device set is sorted in descending order according to its real-time adjustable margin value in the current regulation direction, that is, the device with the largest real-time adjustable margin is placed at the front, and the device with the smallest real-time adjustable margin is placed at the back, resulting in a greedy allocation sequence. The purpose of this sorting step is to ensure that devices with larger adjustable margins are given priority in the subsequent allocation process for regulation tasks.

[0030] The larger the real-time adjustable margin, the stronger the ability of the device to undertake additional adjustment at the current moment. Prioritizing the device to undertake adjustment tasks can maximize the feasibility of a single allocation and help complete the total adjustment with as few devices as possible, thereby reducing the total number of devices involved in the adjustment and reducing the frequency of device actions.

[0031] S4. Obtain the total adjustment amount and assign it to the current remaining adjustment amount; In this embodiment, the total adjustment amount represents the total power regulation requirement that the distributed photovoltaic power station currently needs to perform. It can be determined based on the difference between the target command issued by the dispatch center and the current actual output of the power station. For example, for AGC active power regulation, the total adjustment amount is the difference between the active power target value issued by the dispatch center and the current total active power output of the power station; for AVC reactive power regulation, the total adjustment amount is the difference between the reactive power target value issued by the dispatch center and the current total reactive power output of the power station.

[0032] After obtaining the total adjustment amount, its value is assigned to the current remaining adjustment amount as the initial value for the iterative allocation process. The current remaining adjustment amount is used to record the adjustment amounts that have not yet been allocated during the iteration process.

[0033] S5. Based on the current remaining adjustment amount and the real-time adjustable margin of each power adjustment device in the greedy allocation sequence, perform iterative allocation according to the greedy allocation sequence. In each iteration, the smaller value between the adjustable margin of the power adjustment device in the current round and the current remaining adjustment amount is taken as the adjustment amount allocated to the power adjustment device in this round, and the current remaining adjustment amount is updated based on this adjustment amount. In this embodiment, the iterative allocation process proceeds sequentially according to the device order in the greedy allocation sequence. In each iteration, the device in the current round of the greedy allocation sequence is selected, and its real-time adjustable margin is compared with the current remaining adjustment amount. The smaller of the two values ​​is taken as the adjustment amount allocated to the device in this round. Subsequently, the current remaining adjustment amount is updated using this adjustment amount, specifically by subtracting the adjustment amount allocated in this round from the current remaining adjustment amount. In this way, the current remaining adjustment amount continuously decreases in each iteration based on the adjustment amount allocated in that round until the termination condition is met. If the current remaining adjustment amount decreases to zero after allocation, it indicates that the total adjustment amount has been fully allocated; if it is still greater than zero, the next iteration allocation is performed for the next device.

[0034] This "smallest value" allocation mechanism ensures that: on the one hand, the adjustment amount allocated to any device will not exceed the actual adjustable margin of that device, thus guaranteeing the executability of the instructions; on the other hand, the allocated amount will not exceed the remaining portion of the total adjustment amount, avoiding overshoot. Through the above iterative allocation method, the adjustment amount is concentrated on the few devices ranked first, thereby meeting the total adjustment requirements with the fewest number of device actions and effectively reducing the overall frequency of device actions.

[0035] S6. When the current remaining adjustment amount meets the preset termination condition, the iteration is terminated, and the target adjustment amount of each power adjustment device is output according to the adjustment amount allocated in each round.

[0036] In this embodiment, a preset termination condition is used to control the timing of the end of the iterative allocation. In one implementation, the preset termination condition is that the current remaining adjustment amount is less than or equal to zero, indicating that all adjustment demands have been allocated and further iteration is unnecessary. In another implementation, the preset termination condition is that all power adjustment devices in the greedy allocation sequence have been traversed. Even if the current remaining adjustment amount is still greater than zero (i.e., the total adjustment amount has not been fully allocated), the iteration terminates, and the unallocated remaining amount is recorded as an adjustment gap, to be processed in the next control cycle.

[0037] After the iteration terminates, based on the regulation amount allocated to each power regulation device in each iteration, and combined with the current actual value of each device, the target regulation amount for each device is calculated and output. Specifically, the current actual value of the device is added to the regulation amount allocated to that device to obtain the target regulation amount for that device. The output target regulation amount is used to send it to the corresponding power regulation device for execution, realizing closed-loop control of the power station.

[0038] Compared with existing technologies, this application provides a distributed photovoltaic power allocation method, system, device, and medium. By acquiring the blocking flags for each power regulation device in its corresponding regulation direction, and the real-time adjustable margin of each power regulation device in that direction, the system filters out power regulation devices that are not blocked in their respective regulation directions based on the blocking flags, forming an effective device set. The power regulation devices in the effective device set are then sorted in descending order of their real-time adjustable margins to generate a greedy allocation sequence. The total adjustment amount is obtained and assigned to the current remaining adjustment amount. Based on the current remaining adjustment amount and the real-time adjustable margins of each power regulation device in the greedy allocation sequence, iterative allocation is performed according to the greedy allocation sequence. In each iteration, the smaller value between the adjustable margin of the current power regulation device and the current remaining adjustment amount is used as the adjustment amount allocated to that power regulation device in that round. The system updates the remaining adjustment amount based on this adjustment amount. The iteration terminates when the remaining adjustment amount meets the preset termination condition. Based on the adjustment amount allocated in each round, the target adjustment amount for each power adjustment device is output. In this application, power adjustment devices are screened by a blocking flag to ensure that only devices that are not blocked and have actual adjustment capabilities participate in power allocation, avoiding issuing instructions to invalid devices. At the same time, by sorting in descending order of real-time adjustable margin and performing greedy iterative allocation, devices with large adjustable margins are given priority to undertake adjustment tasks. The iteration terminates immediately after the total adjustment amount is allocated, thereby completing the control target with as few device actions as possible. This avoids frequent small adjustments by multiple devices due to the participation of all devices, effectively reducing the switching frequency of power devices in photovoltaic inverters and static var generators, reducing device losses, extending equipment lifespan, and improving the execution efficiency and accuracy of power control in the power plant.

[0039] In one embodiment of this application, the power regulation device includes a photovoltaic inverter and / or a static var generator.

[0040] In this embodiment, the photovoltaic inverter is the core execution unit for AGC and AVC regulation in the photovoltaic power station, possessing both active power regulation and reactive power regulation capabilities. During AGC regulation, the inverter receives the active power setpoint from the station control system and precisely controls the output active power by adjusting the switching states of its power devices, ensuring that the total active power output of the power station tracks the scheduling target value. Simultaneously, the inverter monitors and reports key information such as its active power, operating status, and available capacity in real time, providing a data foundation for AGC power allocation. During AVC regulation, the inverter has four-quadrant operation capability, enabling it to independently generate or absorb reactive power while outputting active power. The AVC system coordinates and controls the reactive power output of each inverter to achieve the overall voltage / reactive power target of the power station.

[0041] Static var generators (SVAs) are dedicated dynamic reactive power compensation devices in photovoltaic (PV) power plants. They possess bidirectional reactive power regulation capabilities, enabling them to rapidly generate or absorb reactive power to compensate for system reactive power demands, improve the power factor at the connection point, and suppress voltage fluctuations. In AVC control, both SVAs and PV inverters are reactive power regulation devices and can be used as objects for reactive power distribution regulation.

[0042] In summary, photovoltaic inverters possess both active and reactive power regulation capabilities and are the core execution unit for AGC / AVC regulation; static var generators are dedicated to reactive power regulation. The power distribution method provided in this application can be uniformly applied to both types of power regulation equipment.

[0043] As one implementation method, in this embodiment of the application, the interlocking flags include active power increase interlocking flag, active power decrease interlocking flag, reactive power increase interlocking flag, and reactive power decrease interlocking flag.

[0044] In this embodiment, the lockout flag is an identifier used to indicate whether the power regulation device is prohibited from participating in power regulation in a specific regulation direction. This application refines the lockout flag into four independent flag bits, corresponding to the four regulation directions of the power regulation device: active power upward lockout flag, active power downward lockout flag, reactive power upward lockout flag, and reactive power downward lockout flag.

[0045] Specifically, the active power increase lockout flag is used to indicate whether the power regulation equipment is prohibited from performing active power increase regulation; the active power decrease lockout flag is used to indicate whether the power regulation equipment is prohibited from performing active power decrease regulation; the reactive power increase lockout flag is used to indicate whether the power regulation equipment is prohibited from performing reactive power increase regulation; and the reactive power decrease lockout flag is used to indicate whether the power regulation equipment is prohibited from performing reactive power decrease regulation.

[0046] The technical significance of setting the interlocking flags as four independent directional flags lies in the fact that, in actual operation, the availability of power regulation equipment may differ in different regulation directions. For example, a photovoltaic inverter may have insufficient active power up-regulation capacity because its current output is already close to its rated capacity. In this case, the active power up-regulation interlocking flag can be set to true, while the active power down-regulation interlocking flag remains false, so as to continue utilizing the equipment's down-regulation capacity. At the same time, the equipment's reactive power up-regulation interlocking flag and reactive power down-regulation interlocking flag can also remain false, so as to continue utilizing its reactive power regulation capacity.

[0047] By setting inter-directional blocking flags, this application can more precisely describe the actual availability of power regulation equipment, enabling the subsequent power allocation process to accurately screen and allocate power based on the specific availability of each device in each regulation direction, thereby maximizing the utilization of the regulation capabilities of each device within the site.

[0048] Each lockout flag can be either "True" or "False". When a lockout flag is true, it indicates that the power regulating device is locked in that direction and should not be allocated regulation in that direction. When a lockout flag is false, it indicates that the power regulating device is not locked in that direction and can be included in the candidate device set for subsequent power allocation. The initial value of the lockout flag can be set to false (i.e., the device is allowed to participate in regulation in all directions by default), and then the lockout flag for the corresponding direction is set to true according to the triggering of various lockout criteria.

[0049] By setting the above four locking indicators for each direction, this application can accurately depict the actual usability of each power regulation device in each regulation direction, providing a precise data basis for subsequent device selection and power allocation according to the regulation direction.

[0050] In one implementation, the lockout flag in this application embodiment is generated by at least one of the following criteria: command-level criteria, including target command value exceeding limits, command mutation, and / or command dead zone oscillation; equipment-level criteria, including abnormal DC-side voltage of photovoltaic inverter, sudden change in photovoltaic irradiance, attenuation of temperature drift capability of static var generator, real-time adjustable margin of power regulation equipment in the corresponding regulation direction being less than the preset regulation dead zone, equipment failure, and / or equipment not configured to participate in the corresponding type of regulation; system-level criteria, including abnormal grid connection point voltage, abnormal frequency, grid connection point power change rate exceeding limits, and / or communication interruption with dispatch; and user-level criteria, including user-defined lockout conditions, which are determined based on the relationship between telemetry data of power regulation equipment and preset thresholds.

[0051] In this embodiment, the four layers of criteria described above are used to comprehensively judge the blocking state of the power regulation device from different dimensions, ensuring that power distribution is performed only under safe and reasonable conditions. The specific meaning and function of each layer of criteria are described respectively below.

[0052] The instruction layer criteria are used to judge whether the target instruction value issued by the dispatch is reasonable, so as to avoid erroneous regulation of the device caused by abnormal instructions, and specifically include: Target instruction value out of limit: When the active power instruction value or reactive power instruction value issued by the dispatch exceeds the upper or lower instruction limit configured by the system, blocking is triggered. This criterion is used to prevent the device from performing regulation beyond the safe range caused by abnormal dispatch instructions (such as value errors, communication bit errors, etc.).

[0053] Instruction sudden change: When the difference between the current instruction and the previous instruction exceeds the maximum instruction variation range configured by the system, blocking is triggered. This criterion is used to prevent severe device operation caused by excessive instruction jump, which leads to power oscillation.

[0054] Instruction dead band oscillation: When the instruction value changes frequently and slightly between the upward regulation dead band and the downward regulation dead band of active power or reactive power, anti-shake blocking is triggered. This criterion is used to prevent frequent start and stop of the device caused by repeated fluctuation of the instruction near the dead band boundary, and avoid unnecessary device operation loss.

[0055] The device layer criteria are used for independent state diagnosis of each controllable device to identify the unique safety risks of photovoltaic devices, and specifically include: Abnormal DC side voltage of photovoltaic inverter: When the DC side voltage of the photovoltaic inverter exceeds the voltage threshold range exclusive to the photovoltaic scenario (lower than the lower limit or higher than the upper limit), the corresponding direction blocking of the inverter is triggered. Abnormal DC side voltage may be caused by photovoltaic module failure, shadow shading, poor line contact and other reasons. If the inverter continues to be regulated at this time, device damage may be aggravated or safety accidents may be caused.

[0056] Specifically, when the DC voltage of the photovoltaic inverter satisfies the following formula, all-direction (active power up / down regulation, reactive power up / down regulation) blocking of the photovoltaic inverter is triggered: Udc<Udc_min or Udc>Udc_max; Wherein, Udc is the DC voltage of the photovoltaic inverter, Udc_min is the preset DC voltage lower limit threshold; Udc_max is the preset DC voltage upper limit threshold.

[0057] Photovoltaic irradiance mutation: When the change in irradiance per unit time exceeds a preset threshold, the active power regulation of all photovoltaic inverters is locked out. Irradiance is the core influencing factor of photovoltaic power output. Drastic changes in irradiance (such as rapid cloud movement) will cause large fluctuations in the theoretical output of photovoltaics. Under such circumstances, active power regulation may cause the regulation command to fail or cause power oscillation.

[0058] Specifically, when the rate of change of irradiance per unit time satisfies the following formula, the active power regulation lockout of all inverters is triggered: ; Among them, G t G represents the irradiance at the current moment. t 1 represents the irradiance of the previous cycle, G Δmax This is the preset threshold for sudden changes in irradiance (typically 30%).

[0059] Static var generator (SVR) temperature drift capability degradation: When the operating ambient temperature of the SVR exceeds the standard and its reactive power output approaches the saturation threshold, the reactive power regulation lockout of the SVR is triggered. Most SVRs in photovoltaic power plants are deployed outdoors. High-temperature environments can cause performance degradation and reactive power compensation capability degradation in power devices such as insulated gate bipolar transistors (IGBTs). If reactive power regulation commands continue to be sent to the SVR under these conditions, it may fail to respond accurately or even overheat and shut down.

[0060] Specifically, when the operating temperature and reactive power output simultaneously satisfy the following formula, the static var generator reactive power regulation interlock is triggered: ; in, This refers to the real-time operating temperature of the static var generator. Q is the preset temperature threshold. SVG SVG represents the real-time reactive power of a static var generator. rated This refers to the rated capacity of the static var generator. This is the preset reactive power saturation threshold.

[0061] If the real-time adjustable margin of the power regulation device in the corresponding adjustment direction is less than the preset adjustment dead zone: For photovoltaic inverters, if the adjustable margin in the corresponding direction is less than the preset adjustment dead zone of the photovoltaic inverter, the lockout flag for that direction is set to true. The specific judgment is as follows: like ; like ; like ; like ; in, For the active power adjustment margin of photovoltaic inverters; For the active power reduction margin of photovoltaic inverters; For reactive power adjustment margin of photovoltaic inverters; For reactive power reduction margin of photovoltaic inverters; The preset active power regulation dead zone for photovoltaic inverters; This is the preset reactive power regulation dead zone for photovoltaic inverters.

[0062] Similarly, for a static var generator, which only involves reactive power regulation, it is only necessary to determine whether the reactive power upward and downward adjustment margins are less than the preset reactive power regulation dead zone, as follows: like ; like ; in, The reactive power margin for the static var generator; The reactive power reduction margin for the static var generator; This is the preset reactive power adjustment dead zone for the static var generator.

[0063] Equipment failure: When the power regulation equipment fails (such as communication interruption, damage to internal components, etc.), the omnidirectional interlock of the equipment is triggered.

[0064] Equipment not configured to participate in corresponding type of regulation: If a device is not configured to participate in AGC regulation, the active power regulation lockout of the device will be triggered; if it is not configured to participate in AVC regulation, the reactive power regulation lockout of the device will be triggered.

[0065] System-level criteria are used to check site-level safety constraints to ensure that power regulation does not jeopardize the stable operation of the entire photovoltaic power plant. Specifically, these include: Abnormal grid connection point voltage: When the voltage at the grid connection point of a photovoltaic power plant exceeds the normal operating range, the corresponding power regulation lockout is triggered. Abnormal grid connection point voltage may be caused by grid-side faults or reactive power imbalances within the power plant. Continuing to regulate in this situation may exacerbate the risk of voltage exceeding limits.

[0066] Frequency anomaly: When the grid frequency exceeds the normal range, power regulation lockout is triggered. Frequency anomalies are grid-level faults. In this case, photovoltaic power plants should prioritize emergency control in coordination with grid dispatch, rather than performing routine AGC / AVC regulation.

[0067] Grid connection point power change rate exceeds limit: When the rate of change of active or reactive power at the grid connection point exceeds the preset limit, a blocking mechanism is triggered. Exceeding the power change rate limit may be caused by tripping of internal equipment at the substation or grid disturbances; continuing to issue adjustment commands in this situation may exacerbate power fluctuations.

[0068] Interruption of communication with dispatch center: When communication between the photovoltaic power plant and the dispatch center is interrupted, power regulation is locked out. Communication interruption means that the power plant cannot receive dispatch instructions or cannot report the execution status. Continuing to perform regulation under these circumstances may lead to discrepancies between the power plant's output and the dispatch center's expectations, endangering grid security.

[0069] User-level criteria are used to support field stations in customizing interlocking logic according to specific on-site needs, enhancing the flexibility of safety protection. The judgment conditions of user-level criteria support multiple relational operations such as equal to, not equal to, less than, greater than, less than or equal to, and greater than or equal to. For example, users can configure personalized interlocking rules such as "when a certain telemetry measurement of a specific device reaches a preset threshold, the device is prohibited from performing active power regulation," thereby meeting the differentiated safety requirements of different field stations. User-defined interlocking conditions are determined based on the relationship between the telemetry measurement of the power regulation device and the preset threshold. Through this mechanism, field stations can flexibly expand safety interlocking strategies to adapt to the control needs under various special operating conditions.

[0070] The above four criteria constitute a complete interlocking protection system from four dimensions: instruction rationality, equipment health status, system security constraints, and user-specific needs. When any criterion is triggered, the system sets the interlocking flag of the corresponding equipment in the corresponding direction to true according to the criterion type, thereby completing a safety screening before the power allocation process starts and ensuring that only equipment that passes all safety checks is eligible to participate in power allocation.

[0071] As one implementation method, in this application embodiment, for a photovoltaic inverter, the real-time adjustable margin includes active power upward adjustment margin, active power downward adjustment margin, reactive power upward adjustment margin, and reactive power downward adjustment margin; for a static var generator, the real-time adjustable margin includes reactive power upward adjustment margin and reactive power downward adjustment margin.

[0072] In this embodiment, the photovoltaic inverter, as a core device with both total active power regulation and reactive power regulation capabilities, has its active power and reactive power regulation capabilities constrained by real-time operating conditions. Therefore, its adjustability margin needs to be evaluated from four directions: active power increase, active power decrease, reactive power increase, and reactive power decrease. The active power increase margin characterizes the upper limit of active power that the inverter can increase under the current operating conditions; the active power decrease margin characterizes the upper limit of active power that the inverter can decrease under the current operating conditions; the reactive power increase margin characterizes the upper limit of reactive power that the inverter can increase under the current operating conditions; and the reactive power decrease margin characterizes the upper limit of reactive power that the inverter can decrease under the current operating conditions.

[0073] Static var generators (SVAs) do not have active power regulation capabilities; their function is focused on dynamic reactive power compensation. Therefore, their adjustability margin only needs to be evaluated from two directions: reactive power increase and reactive power decrease. The reactive power increase margin characterizes the upper limit of reactive power that the SVA can increase under current operating conditions, while the reactive power decrease margin characterizes the upper limit of reactive power that the SVA can decrease under current operating conditions.

[0074] Based on the above distinctions, this application sets appropriate adjustable margin configurations for the physical characteristics of different types of power regulation devices, which not only fully covers the actual regulation capabilities of each device, but also avoids calculating invalid margins for devices that do not have the corresponding regulation capabilities, thereby improving calculation efficiency.

[0075] In one implementation method, the active power up-adjustment margin in this application embodiment is obtained based on the rated capacity of the photovoltaic inverter, theoretical active power, prediction offset coefficient, time decay coefficient, real-time active power, and active power regulation dead zone. The prediction offset coefficient is obtained based on the deviation between the actual active power and the predicted active power over multiple control cycles, and the time decay coefficient is obtained based on the ratio of the time elapsed from the start of the prediction period to the prediction cycle. The active power down-adjustment margin is obtained based on the real-time active power and active power regulation dead zone of the photovoltaic inverter. The reactive power up-adjustment margin and reactive power down-adjustment margin of the photovoltaic inverter are obtained based on the real-time reactive power limit, predicted reactive power limit, real-time reactive power, and reactive power regulation dead zone of the photovoltaic inverter. The real-time reactive power limit is obtained based on the rated capacity and real-time active power of the photovoltaic inverter, and the predicted reactive power limit is obtained based on the rated capacity of the photovoltaic inverter, the predicted active power of the current prediction cycle, and the prediction offset coefficient.

[0076] In this embodiment, the calculation basis for the adjustable margin in each direction is as follows: (i) Active power upsizing margin is used to characterize the upper limit of active power that a photovoltaic inverter can increase under current operating conditions. Specifically, in the actual operation of a photovoltaic inverter, its active power upsizing capability is constrained by three factors: First, the rated capacity of the inverter determines the absolute upper limit of its active power output; second, the theoretical active power calculated based on real-time irradiance reflects the maximum active power output that the inverter may achieve under current irradiance conditions; and third, the real-time active power of the inverter reflects the current output level. The farther the real-time active power is from the above-mentioned upper limit, the larger the active power upsizing margin; conversely, the closer the real-time active power is to the above-mentioned upper limit, the smaller the active power upsizing margin.

[0077] To further improve the foresight and accuracy of active power margin forecasting, this application introduces two correction parameters: a prediction offset coefficient and a time decay coefficient. The prediction offset coefficient corrects the system deviation between the actual and predicted power at the current moment, thereby eliminating margin estimation errors caused by prediction model errors or sudden weather changes. Specifically, the prediction offset coefficient is obtained statistically based on the deviation between actual and predicted active power over multiple control cycles. Its function is to correct the deviation of theoretical active power, making the margin calculation closer to actual operating conditions. The time decay coefficient adapts to the periodic characteristics of photovoltaic power forecasting, characterizing the power decay trend from the current moment to the end of the forecast period. Specifically, the time decay coefficient is obtained based on the ratio of the time from the current moment to the start of the forecast period to the forecast period. Its function is to compensate for the power change trend within the forecast period, avoiding deviations in margin estimation at the beginning and end of the forecast period due to a fixed forecast period (e.g., 15 minutes).

[0078] Specifically, the prediction offset coefficient is calculated using the following formula: ; in, Preal is the predicted offset coefficient; n represents the actual active power in the nth historical period; Ppred n represents the predicted active power for the nth historical period; The value range is constrained to [0.8, 1.2] to avoid the influence of extreme deviations.

[0079] The time decay factor is calculated using the following formula: ; in, t is the time decay coefficient; t is the time (in minutes) from the current time to the start of the prediction period; T is the prediction period (fixed at 15 minutes). The photovoltaic power stability coefficient (range [0.95, 1.0]) is determined by the equipment type and historical operating data; the more stable the output, the better. The closer it is to 1.0.

[0080] The active power up-adjustment margin of photovoltaic inverter i is calculated using the following formula: }; in, INVrated represents the active power margin of the photovoltaic inverter, Pcalc represents the rated capacity of the photovoltaic inverter, and Pcalc represents the theoretical active power calculated based on real-time irradiance. For prediction offset coefficients; Pinv is the time decay coefficient; Pinv is the real-time active power of the photovoltaic inverter; and Pinv_deadzone is the active power regulation dead zone of the photovoltaic inverter.

[0081] The active power down-regulation margin of photovoltaic inverter i is calculated using the following formula: }; in, Pinv represents the active power down-adjustment margin of the photovoltaic inverter, Pinv represents the real-time active power of the photovoltaic inverter, and Pinv_deadzone represents the active power regulation dead zone of the photovoltaic inverter.

[0082] The reactive power up-adjustment margin and reactive power down-adjustment margin of a photovoltaic inverter are calculated using the following formulas: }; }; in, For reactive power adjustment margin of photovoltaic inverters; For reactive power reduction margin of photovoltaic inverters ; The real-time reactive power limit of the photovoltaic inverter; The predicted reactive power limit for photovoltaic inverters; This refers to the real-time reactive power of the photovoltaic inverter. This refers to the reactive power regulation dead zone of a photovoltaic inverter.

[0083] The real-time reactive power limit of a photovoltaic inverter is calculated using the following formula: ; in, The real-time reactive power limit of a photovoltaic inverter. This refers to the rated capacity of the photovoltaic inverter. This represents the real-time active power of the photovoltaic inverter.

[0084] The predicted reactive power limit of a photovoltaic inverter is calculated using the following formula: ; in, The predicted reactive power limit for photovoltaic inverters. This refers to the rated capacity of the photovoltaic inverter. The predicted active power for the current forecast period. This is the predicted offset coefficient.

[0085] Through the above mechanism, the calculation of active power adjustment margin takes into account both real-time information such as equipment rated capacity, theoretical output, and real-time output, and forward-looking information such as prediction deviation correction and power trend compensation, so that the margin calculation results can more accurately reflect the actual adjustment capacity of the equipment in the future period.

[0086] (ii) Active power reduction margin is used to characterize the upper limit of active power reduction that a photovoltaic inverter can achieve under current operating conditions. Since the physical limit of active power reduction is constrained by the minimum stable operating power of the photovoltaic inverter, this minimum stable operating power is usually determined by the inverter's dead zone. When the real-time active power is higher than the dead zone, the inverter has the ability to reduce active power, and the difference between the real-time active power and the dead zone is the active power reduction margin; when the real-time active power is lower than or equal to the dead zone, the active power reduction margin is zero. Therefore, the active power reduction margin can be directly obtained from the real-time active power and active power dead zone of the photovoltaic inverter without the need to introduce prediction correction parameters.

[0087] (III) The reactive power up-adjustment margin and reactive power down-adjustment margin of a photovoltaic inverter are used to characterize the upper limit of reactive power that the inverter can increase or decrease under the current operating conditions. The reactive power output of a photovoltaic inverter is constrained by the apparent power limit: the sum of the squares of its total active power output and total reactive power output does not exceed the rated apparent capacity. Therefore, the upper limit of the inverter's reactive power regulation capability is different at different active power output levels, that is, the higher the active power output, the smaller the remaining available reactive power capacity. In calculating the reactive power margin, this application introduces two evaluation dimensions simultaneously: the real-time reactive power limit and the predicted reactive power limit. The real-time reactive power limit is calculated based on the inverter's rated capacity and real-time active power, reflecting the upper limit of reactive power capacity at the current moment; the predicted reactive power limit is calculated based on the inverter's rated capacity, the predicted active power of the current prediction period, and the prediction offset coefficient, reflecting the changing trend of the upper limit of reactive power capacity in the future period. When determining the reactive power margin, the smaller of the real-time reactive power limit and the predicted reactive power limit is taken as the upper limit of the constraint, so as to ensure that the reactive power adjustment command does not exceed the safe operating range of the equipment in the current time and future time period.

[0088] In this embodiment, the prediction offset coefficient is used in the above calculation of active power margin and reactive power margin. Its value can be dynamically updated according to the statistical deviation between the actual active power and the predicted active power in multiple control cycles, so as to adapt to the changing characteristics of photovoltaic power output under different seasons and weather conditions.

[0089] As one implementation method, in this embodiment of the application, the reactive power up-adjustment margin and reactive power down-adjustment margin of the static var generator are obtained based on the rated capacity, real-time reactive power, reactive power adjustment dead zone and operating temperature correction coefficient of the static var generator, wherein the operating temperature correction coefficient is determined based on the real-time operating temperature of the static var generator.

[0090] In this embodiment, the calculation of the reactive power up-adjustment margin and reactive power down-adjustment margin of the static var generator differs from that of the photovoltaic inverter in the following ways: First, the static var generator does not have active power regulation capability, so its upper limit of reactive power capability is not affected by changes in active power output, but is mainly constrained by its rated capacity; Second, static var generators are mostly deployed outdoors, and their operating environment temperature has a significant impact on the reactive power output capability of power devices. That is, an increase in temperature will lead to an increase in the on-resistance of power devices such as IGBTs and a decrease in heat dissipation efficiency, thereby reducing the actual reactive power compensation capability of the static var generator. Therefore, this application introduces an operating temperature correction coefficient in the reactive power margin calculation of the static var generator. This coefficient is determined based on the real-time operating temperature of the static var generator: when the operating temperature is within the normal range, the temperature correction coefficient is 1 (i.e., no correction); when the operating temperature increases, the temperature correction coefficient decreases accordingly to reflect the capacity attenuation effect caused by temperature drift.

[0091] Specifically, the temperature correction factor is calculated using the following formula: ; Where, k Temp This is the temperature correction factor. This refers to the real-time operating temperature of the static var generator.

[0092] The reactive power up-adjustment margin and reactive power down-adjustment margin of the static var generator are calculated using the following formulas: }; }; in, The reactive power margin for the static var generator; SVGrated represents the reactive power down-adjustment margin of the static var generator (SVA), Qsvg represents the rated capacity of the SVA, Qsvg represents the real-time reactive power of the SVA, and Qsvg_deadzone represents the reactive power regulation dead zone of the SVA. k Temp This is the temperature correction factor.

[0093] Through the above mechanism, the reactive power margin calculation of the static var generator can dynamically adapt to the actual operating environment of the outdoor deployment of photovoltaic power stations, avoiding the issuance of reactive power adjustment commands to the static var generator that exceed its actual capacity due to ignoring the influence of temperature, thereby improving the reliability of command execution and the safety of the equipment.

[0094] like Figure 2 As shown in the illustration, this application also provides a distributed photovoltaic power distribution system, including: The equipment information acquisition module 21 is used to acquire the lockout flag of each power regulation device in the corresponding adjustment direction, as well as the real-time adjustable margin of each power regulation device in the corresponding adjustment direction. The filtering module 22 is used to filter out power regulating devices that are not locked in the corresponding adjustment direction according to the lockout flag, forming a valid set of devices; The sorting module 23 is used to sort the power regulation devices in the effective device set in descending order of real-time adjustable margin, and generate a greedy allocation sequence. The adjustment amount acquisition module 24 is used to acquire the total adjustment amount and assign the total adjustment amount to the current remaining adjustment amount. The allocation module 25 is used to iteratively allocate power regulation according to the greedy allocation sequence based on the current remaining adjustment amount and the real-time adjustable margin of each power regulation device in the greedy allocation sequence. In each iteration, the smaller value between the adjustable margin of the power regulation device in the current round and the current remaining adjustment amount is used as the adjustment amount allocated to the power regulation device in this round, and the current remaining adjustment amount is updated based on the adjustment amount. The output module 26 is used to terminate the iteration when the current remaining adjustment amount meets the preset termination condition, and output the target adjustment amount of each power adjustment device according to the adjustment amount allocated in each round.

[0095] like Figure 3 As shown in the figure, this application embodiment also provides a distributed photovoltaic power distribution device, including: a processor 31 and a memory 32; Memory 32 is used to store the power allocation processing program for distributed photovoltaic power plants; Processor 31 is used to execute a distributed photovoltaic power distribution processing program to implement the steps of any of the distributed photovoltaic power distribution methods described above.

[0096] This application also provides a computer-readable storage medium storing computer-executable instructions, which, when loaded and executed by a processor, implement the steps of any of the above-described distributed photovoltaic power distribution methods.

[0097] The above description is merely an embodiment of the present invention. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of the present invention, but these improvements all fall within the protection scope of the present invention.

Claims

1. A method for power allocation in a distributed photovoltaic power station, characterized in that, include: Obtain the lockout flag of each power regulation device in the corresponding regulation direction, and the real-time adjustable margin of each power regulation device in the corresponding regulation direction; Based on the lockout flag, select the power regulation devices whose corresponding adjustment direction is not locked to form an effective device set; The power regulation devices in the effective device set are sorted in descending order of the real-time adjustable margin to generate a greedy allocation sequence; Obtain the total adjustment amount and assign the total adjustment amount to the current remaining adjustment amount; Based on the current remaining adjustment amount and the real-time adjustable margin of each power adjustment device in the greedy allocation sequence, iterative allocation is performed according to the greedy allocation sequence. In each iteration, the smaller value between the adjustable margin of the power adjustment device in the current round and the current remaining adjustment amount is taken as the adjustment amount allocated to the power adjustment device in this round, and the current remaining adjustment amount is updated based on the adjustment amount. The iteration terminates when the current remaining adjustment amount meets the preset termination condition, and the target adjustment amount of each power adjustment device is output according to the adjustment amount allocated in each round.

2. The distributed photovoltaic power distribution method according to claim 1, characterized in that, The power regulation equipment includes a photovoltaic inverter and / or a static var generator.

3. The distributed photovoltaic power distribution method according to claim 1, characterized in that, The interlocking indicators include active power increase interlocking indicator, active power decrease interlocking indicator, reactive power increase interlocking indicator, and reactive power decrease interlocking indicator.

4. The distributed photovoltaic power distribution method according to claim 2, characterized in that, The locking flag is generated based on at least one of the following criteria: Instruction-level criteria include target instruction value exceeding limits, instruction mutation, and / or instruction dead zone oscillation; Equipment-level criteria include abnormal DC-side voltage of photovoltaic inverter, sudden change in photovoltaic irradiance, attenuation of temperature drift capability of static var generator, real-time adjustable margin of power regulation equipment in the corresponding regulation direction being less than the preset regulation dead zone, equipment failure and / or equipment not configured to participate in the corresponding type of regulation. System-level criteria include abnormal grid connection point voltage, abnormal frequency, excessive grid connection point power change rate, and / or interruption of communication with dispatch. User-level criteria include user-defined locking conditions, which are determined based on the relationship between the telemetry data of the power regulation device and a preset threshold.

5. The distributed photovoltaic power distribution method according to claim 2, characterized in that, For the photovoltaic inverter, the real-time adjustable margin includes active power upward adjustment margin, active power downward adjustment margin, reactive power upward adjustment margin, and reactive power downward adjustment margin. For the static var generator, the real-time adjustable margin includes reactive power upward adjustment margin and reactive power downward adjustment margin.

6. The distributed photovoltaic power distribution method according to claim 5, characterized in that, The active power adjustment margin is obtained based on the rated capacity, theoretical active power, prediction offset coefficient, time decay coefficient, real-time active power, and active power adjustment dead zone of the photovoltaic inverter. The prediction offset coefficient is obtained based on the deviation between the actual active power and the predicted active power over multiple control cycles, and the time decay coefficient is obtained based on the ratio of the time from the start of the prediction period to the prediction cycle. The active power down-adjustment margin is obtained based on the real-time active power and active power adjustment dead zone of the photovoltaic inverter. The reactive power up-adjustment margin and reactive power down-adjustment margin of the photovoltaic inverter are obtained based on the real-time reactive power limit, predicted reactive power limit, real-time reactive power, and reactive power adjustment dead zone of the photovoltaic inverter. The real-time reactive power limit is obtained based on the rated capacity and real-time active power of the photovoltaic inverter, and the predicted reactive power limit is obtained based on the rated capacity of the photovoltaic inverter, the predicted active power of the current prediction period, and the prediction offset coefficient.

7. The distributed photovoltaic power distribution method according to claim 5, characterized in that, The reactive power up-adjustment margin and reactive power down-adjustment margin of the static var generator are obtained based on the rated capacity, real-time reactive power, reactive power adjustment dead zone, and operating temperature correction coefficient of the static var generator. The operating temperature correction coefficient is determined based on the real-time operating temperature of the static var generator.

8. A distributed photovoltaic power distribution system, characterized in that, include: The equipment information acquisition module is used to acquire the lockout flag of each power adjustment device in the corresponding adjustment direction, and the real-time adjustable margin of each power adjustment device in the corresponding adjustment direction. The filtering module is used to filter out the power regulation devices whose corresponding adjustment direction is not locked according to the lockout flag, so as to form a valid device set; The sorting module is used to sort the power regulation devices in the effective device set in descending order of the real-time adjustable margin, and generate a greedy allocation sequence. The adjustment amount acquisition module is used to acquire the total adjustment amount and assign the total adjustment amount to the current remaining adjustment amount. The allocation module is used to iteratively allocate power regulation according to the current remaining adjustment amount and the real-time adjustable margin of each power regulation device in the greedy allocation sequence. In each iteration, the smaller value between the adjustable margin of the power regulation device in the current round and the current remaining adjustment amount is used as the adjustment amount allocated to the power regulation device in this round, and the current remaining adjustment amount is updated according to the adjustment amount. The output module is used to terminate the iteration when the current remaining adjustment amount meets the preset termination condition, and output the target adjustment amount of each power adjustment device according to the adjustment amount allocated in each round.

9. A power distribution device for a distributed photovoltaic power station, characterized in that, include: Processor and memory; The memory is used to store the power allocation processing program for the distributed photovoltaic power station; The processor is configured to execute the distributed photovoltaic power distribution processing program to implement the steps of the distributed photovoltaic power distribution method as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The readable storage medium stores computer-executable instructions, which, when loaded and executed by a processor, implement the steps of the distributed photovoltaic power allocation method as described in any one of claims 1-7.

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