Photovoltaic power station multi-machine anti-flow adjustment method and system and storage medium

Abstract

The application discloses a photovoltaic power station multi-machine anti-reverse flow adjusting method and system and a storage medium, which can quickly and timely realize multi-machine anti-reverse flow and has low installation difficulty and cost. The method comprises the following steps: querying the communication state of each inverter slave machine; determining that the communication state is normal, and starting the anti-reverse flow function; according to the anti-reverse flow function, acquiring the public power grid end power data detected by a power detection device once every preset time; calculating the first anti-reverse flow deviation reference power according to the public power grid end power data; determining that the absolute value of the first anti-reverse flow deviation reference power is greater than a preset deviation value, and calculating the anti-reverse flow distribution power data of each inverter slave machine according to the first anti-reverse flow deviation reference power; sending the anti-reverse flow distribution power data to each inverter slave machine; calculating the maximum output power limit value of each inverter according to the anti-reverse flow distribution power data; each inverter comprises an inverter slave machine and an inverter master machine; and each inverter adjusts the output power according to the maximum output power limit value.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic power generation control technology, and in particular to a method, system and storage medium for multi-unit anti-reverse current adjustment in photovoltaic power plants. Background Technology

[0002] In the field of photovoltaic (PV) power generation systems, in some regions, to avoid impacting the public power grid and causing a decline in power quality, the electricity generated by PV systems can only be consumed by local loads, and excess electricity is prohibited from entering the public grid. Simultaneously, PV systems must be equipped with anti-reverse current functions and devices. Some regulations stipulate that when reverse current is detected, the PV system must respond within a short time. For example, the PV system needs to respond within 1 second and complete the adjustment of output power and anti-reverse current measures within 2 seconds. This is relatively easy to achieve for systems with only a single PV inverter. However, for PV systems with multiple inverters, traditional control and adjustment methods either spend too much time on the controller's round-robin communication with each inverter, making timely anti-reverse current response difficult, or require the installation of load power acquisition devices, leading to excessively high on-site installation difficulty and cost. Summary of the Invention

[0003] To address at least one of the aforementioned technical problems, this invention proposes a method, system, and storage medium for multi-unit anti-reverse current adjustment in photovoltaic power plants. This method enables rapid and timely anti-reverse current adjustment for multiple units without requiring the installation of load power acquisition devices as in traditional methods, resulting in lower installation difficulty and cost.

[0004] On one hand, embodiments of the present invention provide a method for adjusting the anti-reverse current of multiple photovoltaic power plants, including the following steps:

[0005] Check the communication status of each inverter slave unit;

[0006] Once the communication status is confirmed to be normal, activate the anti-backflow function;

[0007] According to the anti-reverse current function, the power data of the public power grid detected by the power detection device is acquired once every preset time.

[0008] The first anti-reverse current deviation reference power is calculated based on the power data of the public power grid.

[0009] Determine that the absolute value of the first anti-reverse current deviation reference power is greater than a preset deviation value, and calculate the anti-reverse current allocation power data of each inverter slave based on the first anti-reverse current deviation reference power;

[0010] The anti-reverse current distribution power data is sent to each inverter slave unit;

[0011] The maximum output power limit value of each inverter is calculated based on the anti-reverse current distribution power data; wherein, each inverter includes each inverter slave and inverter master;

[0012] Adjust the output power according to the maximum output power limit value.

[0013] A method for adjusting multi-unit anti-reverse current in a photovoltaic power station according to an embodiment of the present invention has at least the following beneficial effects: This embodiment first checks the communication status of each inverter slave to ensure normal communication between each inverter slave and the inverter master, thus alleviating the problem of untimely anti-reverse current response due to communication issues. After confirming normal communication status, the anti-reverse current function is activated. This embodiment acquires the power data detected by the power detection device at the public grid end every preset time interval, and calculates the first anti-reverse current deviation reference power, i.e., the power deviation from the set anti-reverse current power reference, based on the obtained public grid end power data. When the absolute value of the first anti-reverse current deviation from the reference power is determined to be greater than a preset deviation value, this embodiment calculates the anti-reverse current allocation power data for each inverter slave based on the first anti-reverse current deviation from the reference power, and sends the anti-reverse current allocation power data to each inverter slave so that each inverter slave can obtain its anti-reverse current allocation power data during the anti-reverse current process. This allows each inverter to calculate its corresponding maximum output power limit value based on the obtained anti-reverse current allocation power data. In other words, each inverter autonomously calculates its maximum output power using the anti-reverse current allocation power data, and then limits its maximum output power according to the maximum output power limit value, thus achieving the overall anti-reverse current effect. Furthermore, by autonomously calculating the maximum output power limit value by each inverter slave and inverter master, the response speed of anti-reverse current is improved, enabling rapid and timely multi-machine anti-reverse current implementation. Simultaneously, this embodiment obtains power data from the public grid by installing a power detection device at the public grid end, eliminating the need for installing load power acquisition devices as in traditional methods, thus reducing installation difficulty and cost.

[0014] According to some embodiments of the present invention, before performing the step of querying the communication status of each inverter slave, the method further includes:

[0015] Configure the communication address of each inverter slave, the total reverse current power reference data, and the rated power of each inverter slave.

[0016] According to some embodiments of the present invention, the step of calculating the first anti-reverse current deviation reference power based on the power data of the public power grid includes:

[0017] The first anti-reverse current deviation reference power is calculated based on the power data of the public power grid and the total reverse current power reference data.

[0018] According to some embodiments of the present invention, the step of calculating the anti-reverse current allocation power data of each inverter slave based on the first anti-reverse current deviation reference power includes:

[0019] The anti-reverse current distribution power data is calculated based on the ratio of the rated power and the first anti-reverse current deviation reference power.

[0020] According to some embodiments of the present invention, during the step of determining that the communication status is normal and activating the anti-reverse current function, the method further includes:

[0021] If the communication status is determined to be abnormal, wait a preset time before querying the communication status again;

[0022] Alternatively, if the communication status is determined to be abnormal, a communication abnormality alarm can be triggered.

[0023] According to some embodiments of the present invention, the step of calculating the maximum output power limit value of each inverter based on the anti-reverse current distribution power data includes:

[0024] The maximum output power limit is calculated based on the current output power of each inverter and the anti-reverse current distribution power data.

[0025] In some embodiments of the present invention, sending the anti-reverse current distribution power data to each inverter slave includes:

[0026] The anti-reverse current distribution power data is sent to each inverter slave unit by sending broadcast data packets.

[0027] On the other hand, embodiments of the present invention also provide a multi-unit anti-reverse current adjustment system for photovoltaic power plants, comprising:

[0028] The communication status query module is used to query the communication status of each inverter slave unit;

[0029] The function activation module is used to determine that the communication status is normal and activate the anti-backflow function;

[0030] The first detection module is used to acquire the power data of the public power grid detected by the power detection device at preset intervals according to the anti-reverse current function.

[0031] The first calculation module is used to calculate the first anti-reverse current deviation reference power based on the power data of the public power grid.

[0032] The second calculation module is used to determine that the absolute value of the first anti-reverse current deviation reference power is greater than a preset deviation value, and to calculate the anti-reverse current allocation power data of each inverter slave based on the first anti-reverse current deviation reference power.

[0033] The communication module is used to send the anti-reverse current distribution power data to each inverter slave unit;

[0034] The third calculation module is used to calculate the maximum output power limit value of each inverter based on the anti-reverse current distribution power data; wherein, each inverter includes each inverter slave and inverter master;

[0035] An output power limiting module is used to adjust the output power according to the maximum output power limit value.

[0036] On the other hand, embodiments of the present invention also provide a multi-unit anti-reverse current adjustment system for photovoltaic power plants, comprising:

[0037] At least one processor;

[0038] At least one memory for storing at least one program;

[0039] When the at least one program is executed by the at least one processor, the at least one processor implements the multi-machine anti-reverse flow adjustment method for photovoltaic power plants as described in the above embodiments.

[0040] On the other hand, embodiments of the present invention also provide a computer storage medium storing a processor-executable program, which, when executed by the processor, is used to implement the multi-machine anti-reverse flow adjustment method for photovoltaic power plants as described in the above embodiments. Attached Figure Description

[0041] Figure 1 This is a flowchart of the multi-unit anti-reverse current adjustment method for photovoltaic power plants provided in this embodiment of the invention;

[0042] Figure 2 This is a block diagram of the principle of the multi-machine anti-reverse flow adjustment system for photovoltaic power plants provided in an embodiment of the present invention. Detailed Implementation

[0043] The embodiments described in this application should not be considered as limitations on this application. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0044] In the following description, references are made to “some embodiments,” which describe a subset of all possible embodiments. However, it is understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0046] In the field of photovoltaic (PV) power generation systems, some regions have implemented regulations to avoid impacting the public power grid and causing a decline in power quality. These regulations stipulate that the electricity generated by PV systems can only be consumed by local loads, and excess electricity is prohibited from entering the public grid. Furthermore, to comply with these regulations, PV systems must be equipped with anti-reverse current functions and devices, and must complete output power adjustment and anti-reverse current measures within a short time. For example, when a reverse current situation is detected, the PV system needs to respond within one second and complete output power adjustment and anti-reverse current measures within two seconds. This is relatively easy to achieve for systems with only a single PV inverter, but traditional control and adjustment methods present significant challenges for power generation systems with multiple inverters. For instance, in related technologies, independent controllers or main units repeatedly query the current output power of each inverter, collect information, calculate the result, and then issue power limiting commands to each inverter. When there are many inverters, the back-and-forth communication consumes a large portion of the time, making it difficult to meet the time requirements for timely response and adjustment.

[0047] Based on this, one embodiment of the present invention provides a method for multi-unit anti-reverse current adjustment in photovoltaic power plants, which can quickly and timely achieve multi-unit anti-reverse current, and does not require the installation of load power acquisition devices as in traditional methods, thus reducing installation difficulty and cost. (Refer to...) Figure 1 The method in this embodiment of the invention includes, but is not limited to, steps S110, S120, S130, S140, S150, S160, S170 and S180.

[0048] Specifically, the application process of the method in this embodiment of the invention includes, but is not limited to, the following steps:

[0049] S110: Query the communication status of each inverter slave unit.

[0050] S120: Confirm that the communication status is normal and activate the anti-backflow function.

[0051] S130: Based on the anti-reverse current function, the power data of the public power grid detected by the power detection device is acquired once every preset time.

[0052] S140: The first anti-reverse current deviation reference power is calculated based on the power data of the public power grid.

[0053] S150: Determine that the absolute value of the first anti-reverse current deviation reference power is greater than the preset deviation value, and calculate the anti-reverse current distribution power data of each inverter slave based on the first anti-reverse current deviation reference power.

[0054] S160: Sends the anti-reverse current distribution power data to each inverter slave.

[0055] S170: Calculate the maximum output power limit for each inverter based on the anti-reverse current distribution power data. Each inverter includes both the inverter slave and the inverter master.

[0056] S180: Adjust the output power according to the maximum output power limit.

[0057] In this specific embodiment, the communication status of each inverter slave is first queried. Specifically, this embodiment sets one inverter in the photovoltaic system as the master, and the remaining inverters as slaves. Then, the communication status of each inverter slave is queried one by one by the inverter master to determine that all inverter slaves are online, that is, that the communication status of each inverter slave is normal. When it is determined that the communication status of each inverter slave is normal, the anti-reverse current function is activated. Based on the activated anti-reverse current function, this embodiment acquires the power data of the public grid detected by the power detection device at preset time intervals. For example, the power detection device is queried every 500 milliseconds to acquire the power information P of the public grid detected by the power detection device. g It should be noted that the power detection device can also be an electricity meter, which detects the power information at the public grid end. Further, in this embodiment, the first anti-reverse current deviation reference power is calculated based on the power data at the public grid end; that is, the power deviating from the set anti-reverse current power reference is calculated using the power data at the public grid end. It should be noted that when the first anti-reverse current deviation reference power is less than 0, it indicates that the photovoltaic system has excess power entering the public grid, and the inverter needs to adjust and reduce its output power. Conversely, when the first anti-reverse current deviation reference power is greater than 0, it indicates that the photovoltaic system is drawing power from the public grid, and the inverter needs to adjust and increase its output power. Further, determining that the absolute value of the first anti-reverse current deviation reference power is greater than a preset deviation value, this embodiment calculates the anti-reverse current allocation power data for each inverter slave based on the first anti-reverse current deviation reference power. For example, assuming the preset deviation value is ΔP, when it is determined that the absolute value of the first anti-reverse current deviation reference power is greater than the preset deviation value ΔP, it indicates that there is a reverse current situation and the output power of the inverter needs to be adjusted. At this time, this embodiment calculates the anti-reverse current allocation power data of each inverter slave through the first anti-reverse current deviation reference power, that is, the anti-reverse current power data allocated to each inverter slave.

[0058] Furthermore, in this embodiment, the anti-reverse current allocation power data is sent to each inverter slave. After calculating the anti-reverse current allocation power data for each inverter slave through the inverter master, this embodiment sends the anti-reverse current allocation power data to each inverter slave. Further, the maximum output power limit value for each inverter is calculated based on the anti-reverse current allocation power data. Each inverter includes both inverter slaves and the inverter master. Specifically, in this embodiment, the inverter master and inverter slaves calculate their respective maximum output power limit values ​​based on the anti-reverse current allocation power data. In this embodiment, by having the inverter master and each inverter slave autonomously calculate their corresponding maximum output power limit value based on the acquired anti-reverse current allocation power data, the anti-reverse current calculation is adjusted and distributed to each inverter for execution, greatly reducing the round-trip communication time and improving the anti-reverse current response speed. Further, the output power is adjusted according to the maximum output power limit value. Each inverter adjusts its output power based on its calculated maximum output power limit, thereby achieving overall anti-reverse current effect and realizing closed-loop control for overall anti-reverse current, with a rapid and timely response. Furthermore, this embodiment does not require additional load power acquisition devices; it only needs to acquire power data from the public power grid using a power detection device or meter installed at the public grid end. This eliminates the need for traditional load power acquisition devices, resulting in lower installation difficulty and cost.

[0059] In some embodiments of the present invention, before performing the step of querying the communication status of each inverter slave, the method provided by the embodiments of the present invention further includes, but is not limited to:

[0060] Configure the communication address of each inverter slave, the total reverse current power reference data, and the rated power of each inverter slave.

[0061] In this specific embodiment, before querying the communication status of each inverter slave via the inverter master, the communication address, total reverse current power reference data, and rated power of each inverter slave are first set. Specifically, in this embodiment, the inverter master communicates with each inverter slave and the power detection device via RS485 or CAN communication protocol. Therefore, before querying the communication status of each inverter slave, a communication address needs to be set for each inverter slave so that the inverter master can query each inverter slave one by one according to its communication address to confirm that all inverters are online. In addition, this embodiment also inputs the total reverse current power reference data P into the inverter master. mref (P mref ≤0), and the rated power value corresponding to each inverter slave unit.

[0062] In some embodiments of the present invention, the first anti-reverse current deviation reference power is calculated based on power data from the public power grid, including but not limited to:

[0063] The first anti-reverse current deviation reference power is calculated based on the power data of the public power grid and the total reverse current power reference data.

[0064] In this specific embodiment, the first anti-reverse current deviation reference power is calculated based on the power data at the public grid end and the total reverse current power reference data. Specifically, in this embodiment, the obtained power data P at the public grid end is used... g Subtract the total reverse power reference data P mref The first anti-reverse flow deviation reference power is obtained, and the calculation formula is shown in the following formula (1):

[0065] P r =P g -P mref (1)

[0066] Wherein, P g For power data at the public power grid end, P mref For total countercurrent power reference data, P r The first anti-reverse current deviation reference power is the power that deviates from the set anti-reverse current power reference.

[0067] In some embodiments of the present invention, the anti-reverse current allocation power data of each inverter slave is calculated based on the first anti-reverse current deviation reference power, including but not limited to:

[0068] The anti-reverse current distribution power data is calculated based on the ratio of rated power and the first anti-reverse current deviation reference power.

[0069] In this specific embodiment, the anti-reverse current allocation power data is calculated based on the ratio of rated power to rated power and the first anti-reverse current deviation reference power. Specifically, the inverter master first calculates the rated power ratio of each inverter using the input rated power of each inverter slave. Then, it calculates the anti-reverse current allocation power data using the ratio of rated power and the first anti-reverse current deviation reference power. For example, if the first anti-reverse current deviation reference power is P... r =-1000W indicates that the current photovoltaic system has an excess of 1000W of power flowing into the public grid. If there are three inverters, A, B, and C, with rated powers of 5kW, 3kW, and 2kW respectively, then the ratio of their rated powers is 5:3:2. Correspondingly, the anti-reverse current distribution power data is P. A = -500W, P B = -300W, P C = -200W.

[0070] In some embodiments of the present invention, during the step of determining that the communication status is normal and activating the anti-reverse current function, the method provided by the embodiments of the present invention further includes, but is not limited to:

[0071] If the communication status is found to be abnormal, wait for a preset time before checking the communication status again.

[0072] Alternatively, if an abnormal communication status is detected, a communication anomaly alert can be issued.

[0073] In this specific embodiment, when it is determined that the communication status of each inverter slave is abnormal, the system waits for a preset time before querying the communication status again, or issues a communication anomaly alarm. Specifically, during the process of querying the communication status of each inverter slave one by one, if the communication status of a certain inverter slave is determined to be abnormal, a delay is performed. After waiting for the preset time length, the system queries the communication status of that inverter slave again. Alternatively, if it is determined that a certain inverter slave is offline, i.e., its communication status is abnormal, a communication anomaly alarm is issued directly. It is easy to understand that in some embodiments of the present invention, if the inverter master waits for the preset time length and then queries again and finds that the communication status of the inverter slave is still offline, i.e., it is still in a communication anomaly state, a communication anomaly alarm is issued at this time. This embodiment repeatedly queries for communication status anomalies, and when it is determined that an inverter slave is offline or disconnected, i.e., its communication status is abnormal, a communication anomaly alarm is issued, thereby promptly reminding management personnel to handle the relevant anomalies and alleviating the problem of untimely anti-reverse current adjustments caused by communication problems.

[0074] In some embodiments of the present invention, the maximum output power limit value of each inverter is calculated based on the anti-reverse current distribution power data, including but not limited to:

[0075] The maximum output power limit is calculated based on the current output power and anti-reverse current distribution power data of each inverter.

[0076] In this specific embodiment, the maximum output power limit is calculated using the current output power of each inverter and the anti-reverse current allocation power data. Specifically, each inverter first obtains its current output power internally, and then each inverter calculates its own maximum output power limit based on the anti-reverse current allocation power data calculated by the inverter host. The calculation formula is shown in equation (2) below:

[0077] P limt =P out +P i (2)

[0078] Wherein, P limt P represents the maximum output power limit for each inverter. out P represents the current output power collected internally by each inverter. i P represents the anti-reverse current power allocated proportionally to the rated power of each inverter, i.e., the anti-reverse current allocation power data. i(i = 0, 1, 2, ..., n), P r =P0 + P1 + P2 + ... + P n .

[0079] In some embodiments of the present invention, reverse current distribution power data is sent to each inverter slave, including but not limited to:

[0080] The anti-reverse current distribution power data is sent to each inverter slave unit by sending broadcast data packets.

[0081] In this specific embodiment, the anti-reverse current allocation power data is sent to each inverter slave unit via broadcast data packets. Specifically, the inverter master unit calculates the anti-reverse current allocation power data for each inverter based on the rated power ratio of each inverter and the first anti-reverse current deviation reference power, and then fills the anti-reverse current allocation power data corresponding to each inverter slave unit into the standard broadcast packet. For example, the broadcast packet includes the contents shown in Table 1 below:

[0082] Table 1

[0083]

[0084] In this embodiment, the anti-reverse current allocation power data corresponding to each inverter slave is filled into a broadcast packet, and then broadcasted to each inverter slave. After receiving the broadcast packet, each inverter slave obtains its corresponding anti-reverse current allocation power data according to its own communication address, and then calculates its maximum output power limit value based on the anti-reverse current allocation power data to complete the output adjustment and anti-reverse current.

[0085] An embodiment of the present invention also provides a multi-unit anti-reverse current adjustment system for photovoltaic power plants, comprising:

[0086] The communication status query module is used to query the communication status of each inverter slave unit.

[0087] The function startup module is used to determine that the communication status is normal and to activate the anti-backflow function.

[0088] The first detection module is used to acquire the power data of the public power grid detected by the power detection device at preset intervals according to the anti-reverse current function.

[0089] The first calculation module is used to calculate the first anti-reverse current deviation reference power based on the power data of the public power grid.

[0090] The second calculation module is used to determine that the absolute value of the first anti-reverse current deviation reference power is greater than the preset deviation value, and to calculate the anti-reverse current allocation power data of each inverter slave based on the first anti-reverse current deviation reference power.

[0091] The communication module is used to send the anti-reverse current distribution power data to each inverter slave unit.

[0092] The third calculation module is used to calculate the maximum output power limit of each inverter based on the anti-reverse current power allocation data. Each inverter includes an inverter slave and an inverter master.

[0093] The output power limiting module is used to limit the output power according to the maximum output power limit value.

[0094] refer to Figure 2 An embodiment of the present invention also provides a multi-unit anti-reverse current adjustment system for photovoltaic power plants, comprising:

[0095] At least one processor 210.

[0096] At least one memory 220 is used to store at least one program.

[0097] When at least one program is executed by at least one processor 210, the at least one processor 210 implements the photovoltaic power plant multi-machine anti-reverse flow adjustment method as described in the above embodiments.

[0098] An embodiment of the present invention also provides a computer-readable storage medium storing computer-executable instructions that are executed by one or more control processors, for example, performing the steps described in the above embodiments.

[0099] It will be understood by those skilled in the art that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include computer storage media (or non-transitory media) and communication media (or transient media). As is known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, as is known to those skilled in the art, communication media typically contain computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0100] The above is a detailed description of the preferred embodiments of the present invention. However, the present invention is not limited to the above embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of the present invention.

Claims

1. A method for adjusting the anti-reverse current of multiple units in a photovoltaic power station, characterized in that, Includes the following steps: Check the communication status of each inverter slave unit; Once the communication status is confirmed to be normal, activate the anti-backflow function; According to the anti-reverse current function, the power data of the public power grid detected by the power detection device is acquired once every preset time. The first anti-reverse current deviation reference power is calculated based on the power data of the public power grid. Determine that the absolute value of the first anti-reverse current deviation reference power is greater than a preset deviation value, and calculate the anti-reverse current allocation power data of each inverter slave based on the first anti-reverse current deviation reference power; The anti-reverse current distribution power data is sent to each inverter slave unit; The maximum output power limit value of each inverter is calculated based on the anti-reverse current distribution power data; wherein, each inverter includes each inverter slave and inverter master; Adjust the output power according to the maximum output power limit value; The step of calculating the first anti-reverse current deviation reference power based on the power data of the public power grid includes: The first anti-reverse current deviation reference power is calculated based on the power data of the public power grid and the total reverse current power reference data. The step of calculating the anti-reverse current allocation power data of each inverter slave based on the first anti-reverse current deviation reference power includes: The anti-reverse current distribution power data is calculated based on the ratio of the rated power and the first anti-reverse current deviation reference power. The step of calculating the maximum output power limit value of each inverter based on the anti-reverse current distribution power data includes: The maximum output power limit is calculated based on the current output power of each inverter and the anti-reverse current distribution power data; wherein, each inverter slave and inverter master autonomously calculate the maximum output power limit.

2. The method for adjusting the multi-unit anti-reverse current of a photovoltaic power station according to claim 1, characterized in that, Before performing the step of querying the communication status of each inverter slave, the method further includes: Configure the communication address of each inverter slave, the total reverse current power reference data, and the rated power of each inverter slave.

3. The method for adjusting the multi-unit anti-reverse current of a photovoltaic power station according to claim 1, characterized in that, In the process of determining that the communication status is normal and activating the anti-backflow function, the method further includes: If the communication status is determined to be abnormal, wait a preset time before querying the communication status again; Alternatively, if the communication status is determined to be abnormal, a communication abnormality alarm can be triggered.

4. The method for adjusting the multi-unit anti-reverse current of a photovoltaic power station according to claim 1, characterized in that, The step of sending the anti-reverse current distribution power data to each inverter slave includes: The anti-reverse current distribution power data is sent to each inverter slave unit by sending broadcast data packets.

5. A multi-unit anti-reverse current adjustment system for a photovoltaic power station, characterized in that, include: The communication status query module is used to query the communication status of each inverter slave unit; The function activation module is used to determine that the communication status is normal and activate the anti-backflow function; The first detection module is used to acquire the power data of the public power grid detected by the power detection device at preset intervals according to the anti-reverse current function. The first calculation module is used to calculate the first anti-reverse current deviation reference power based on the power data of the public power grid. The second calculation module is used to determine that the absolute value of the first anti-reverse current deviation reference power is greater than a preset deviation value, and to calculate the anti-reverse current allocation power data of each inverter slave based on the first anti-reverse current deviation reference power; The communication module is used to send the anti-reverse current distribution power data to each inverter slave unit; The third calculation module is used to calculate the maximum output power limit value of each inverter based on the anti-reverse current distribution power data; wherein, each inverter includes each inverter slave and inverter master; An output power limiting module is used to adjust the output power according to the maximum output power limit value; The step of calculating the first anti-reverse current deviation reference power based on the power data of the public power grid includes: The first anti-reverse current deviation reference power is calculated based on the power data of the public power grid and the total reverse current power reference data. The step of calculating the anti-reverse current allocation power data of each inverter slave based on the first anti-reverse current deviation reference power includes: The anti-reverse current distribution power data is calculated based on the ratio of the rated power and the first anti-reverse current deviation reference power. The step of calculating the maximum output power limit value of each inverter based on the anti-reverse current distribution power data includes: The maximum output power limit is calculated based on the current output power of each inverter and the anti-reverse current distribution power data; wherein, each inverter slave and inverter master autonomously calculate the maximum output power limit.

6. A multi-unit anti-reverse current adjustment system for a photovoltaic power station, characterized in that, include: At least one processor; At least one memory for storing at least one program; When the at least one program is executed by the at least one processor, the at least one processor implements the photovoltaic power plant multi-machine anti-reverse flow adjustment method as described in any one of claims 1 to 4.

7. A computer storage medium storing a processor-executable program, characterized in that, The program executable by the processor is used, when executed by the processor, to implement the multi-machine anti-reverse flow adjustment method for photovoltaic power plants as described in any one of claims 1 to 4.

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