Photovoltaic grid-connected power control method and control system

Abstract

The invention discloses a photovoltaic grid-connected power control method and system, and belongs to the technical field of photovoltaic grid-connected, the photovoltaic grid-connected power control method is applied to an intelligent collector, and the method comprises the following steps: obtaining total grid-connected power data and a grid-connected strategy power maximum value; obtaining a grid-connected power difference value according to the total grid-connected power data and the grid-connected strategy power maximum value; operating a power control strategy according to the grid-connected power difference value; the power control strategy comprises the following steps: acquiring inverter data; when the grid-connected power difference value is greater than zero, reducing a limited power parameter of the inverter according to the grid-connected power difference value and the inverter data; and when the grid-connected power difference value is less than zero, increasing the limited power parameter of the inverter according to the grid-connected power difference value and the inverter data. The inverter is controlled through the intelligent collector, and the problem that the master station cannot quickly regulate and control the power of the inverter due to remote communication delay or communication failure is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of photovoltaic grid-connected technology, and in particular relates to a photovoltaic grid-connected power control method and control system. Background Art

[0002] Industrial and commercial power stations usually include the grid-connected inverters of multiple machines. In general, the smart collector and the master station are connected through a dedicated line to ensure reliable and stable communication. The smart collector is responsible for data collection and command forwarding, and strategy execution is calculated by the power station system. The power station system formulates the monitoring equipment data in real time according to the total power data of the gateway table to issue power control commands to the inverter, thereby realizing the regulation of inverter power.

[0003] For example, the Chinese patent with publication number CN113972746B discloses a low-voltage grid-connected distributed photovoltaic observation and control method and device, which includes: data collection and remote monitoring. It can use the protocol adaptive recognition function through the photovoltaic protocol converter to automatically identify the protocol type of the inverter interacting with it, parse the corresponding data, generate a standard message, reply to the collection terminal, and finally report it to the main station by the collection terminal to complete the entire communication process.

[0004] However, due to the existence of remote communication delays, the master station cannot quickly regulate the inverter power with low latency, and when the remote network is delayed or the communication fails, the regulation of the inverter power cannot be guaranteed, which may easily lead to grid-connected power errors, causing hidden dangers in grid-connected electricity use and public property losses, and seriously endangering social property safety.

[0005] Therefore, there is an urgent need to develop a photovoltaic grid-connected power control method and control system to solve the problems in the prior art. Summary of the invention

[0006] The purpose of the present invention is to provide a photovoltaic grid-connected power control method and control system, which controls the inverter through an intelligent collector to solve the problem raised in the above background technology that the master station cannot quickly adjust the inverter power due to remote communication delay or communication failure, which may easily cause hidden dangers in electricity use and even public property losses.

[0007] In order to solve the above technical problems, the specific technical solutions of the present invention are as follows:

[0008] A photovoltaic grid-connected power control method, applied to an intelligent collector, comprises the following steps:

[0009] Step S1: Obtaining total grid-connected power data and maximum grid-connected strategy power;

[0010] Step S2: Obtaining the grid-connected power difference according to the total grid-connected power data and the maximum grid-connected strategy power;

[0011] Step S3: Execute the power control strategy according to the grid-connected power difference;

[0012] The power control strategy includes the following:

[0013] Get inverter data;

[0014] When the grid-connected power difference is greater than zero, the inverter power limit parameter is reduced according to the grid-connected power difference and inverter data;

[0015] When the grid-connected power difference is less than zero, the inverter power limit parameter is increased according to the grid-connected power difference and inverter data.

[0016] The photovoltaic grid-connected power control method applied to the intelligent collector provided in the present application sets the power control strategy in the intelligent collector so that the intelligent collector can control the power parameters of the inverter offline without the main station, so as to realize real-time and rapid control of the inverter power when the remote communication is delayed or the communication fails, so that the inverter and the solar panel are connected to the grid for power generation and meet the requirements of the power grid company for the nature of the grid-connected power and the technical specifications of the power, thereby improving the real-time effective utilization rate of the power of multiple machines connected to the grid and ensuring the stability and security of the power grid.

[0017] At the same time, the grid-connected power generation business in the prior art includes application scenarios such as self-use, balance grid connection, full grid connection and grid-connected power limitation. Various application scenarios require the use of different control schemes of equipment and matching systems, etc., and one solution cannot cover all application scenarios. This application can directly update the power control strategy to the smart collector through local configuration, so that the smart collector can be completely separated from the main station, reducing the connection between the smart collector and the main station, so that the smart collector can directly execute the power control strategy in real time according to the total grid-connected power data and the maximum power of the grid-connected strategy, effectively improving the real-time control speed and meeting various grid-connected power generation laws and regulations.

[0018] Furthermore, the inverter data includes current power limit parameters, actual output power and rated power of each inverter;

[0019] The method of reducing the inverter power limit parameter according to the grid-connected power difference and the inverter data includes the following:

[0020] Compare the actual output powers of the inverters, and sequentially reduce the power limit parameters of the inverters according to the grid-connected power difference; wherein the order of reduction is from the inverter with the smallest actual output power to the inverter with the largest actual output power;

[0021] The method of increasing the inverter power limit parameter according to the grid-connected power difference and the inverter data includes the following:

[0022] Compare the output power differences of each inverter, and sequentially increase the power limit parameters of the inverter according to the grid-connected power difference; wherein the order of increase is from the inverter with the smallest output power difference to the inverter with the largest output power difference; the output power difference is the difference between the power limit parameter and the actual output power.

[0023] This application configures the order of reduction from the inverter with the smallest actual output power to the inverter with the largest actual output power to concentrate the power on one or several inverters, which helps to reduce the number of inverters and improve the control speed of the intelligent collector. At the same time, the order of increase is configured from the inverter with the smallest output power difference to the inverter with the largest output power difference, so that the grid-connected output power tends to be constant.

[0024] Furthermore, the grid-connected power difference is calculated by the following formula:

[0025] delta = MAX_P - M_P;

[0026] Among them, delta is the grid-connected power difference, MAX_P is the maximum power of the grid-connected strategy, and M_P is the total grid-connected power data;

[0027] The power control strategy according to the grid-connected power difference includes the following:

[0028] When the grid-connected power difference is less than zero or greater than the regulation threshold, the power control strategy is run.

[0029] The present application sets a control threshold. When the grid-connected power difference is between zero and the control threshold, the power control strategy is not run to avoid frequent fluctuations in the control of a power point, thereby reducing the number of adjustments and extending the service life of the system.

[0030] Furthermore, when the power control strategy is executed, the intelligent collector is connected to the inverter via a high-frequency data acquisition model.

[0031] The intelligent collector of the present application is connected to the inverter through a high-frequency data acquisition model to be compatible with equipment from different manufacturers and effectively improve the real-time control speed.

[0032] Furthermore, the high-frequency data acquisition model has at least two protocol data units.

[0033] Further, when the power limit parameter of the inverter is lowered according to the grid-connected power difference and the inverter data or when the power limit parameter of the inverter is increased according to the grid-connected power difference and the inverter data, the intelligent collector sends a splicing frame broadcast command to the inverter.

[0034] This application adopts frame broadcast commands to further improve the real-time control speed of the intelligent collector and meet various grid-connected power generation laws and regulations.

[0035] A photovoltaic grid-connected power control system, comprising:

[0036] Inverter;

[0037] An intelligent collector, the intelligent collector is communicatively connected to the inverter, and the intelligent collector is used to obtain total grid-connected power data and a maximum grid-connected power strategy; obtain a grid-connected power difference according to the total grid-connected power data and the maximum grid-connected power strategy; and operate a power control strategy according to the grid-connected power difference;

[0038] The power control strategy includes the following:

[0039] Get inverter data;

[0040] When the grid-connected power difference is greater than zero, the inverter power limit parameter is reduced according to the grid-connected power difference and inverter data;

[0041] When the grid-connected power difference is less than zero, the inverter power limit parameter is increased according to the grid-connected power difference and inverter data.

[0042] Furthermore, it also includes a photovoltaic management system and a gateway table;

[0043] The photovoltaic management system is communicatively connected with the intelligent collector;

[0044] The gateway table is in communication connection with the intelligent collector, and the gateway table is used to provide the total grid-connected power data for the intelligent collector;

[0045] The inverter is provided with a plurality of them, and the intelligent collector is respectively connected to the gateway table and the inverter in communication through a high-frequency data acquisition model.

[0046] A computer device comprises a memory, a processor and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the method.

[0047] A computer program product comprises a computer program, which implements the steps of the method when executed by a processor.

[0048] Other features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 This is a flowchart of the application;

[0050] Figure 2 This is a schematic diagram of the specific process of applying for the intelligent collector. DETAILED DESCRIPTION

[0051] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings.

[0052] A photovoltaic grid-connected power control method is applied to intelligent collectors, such as Figure 1 As shown, the following steps are included:

[0053] Step S1: Obtaining total grid-connected power data and maximum grid-connected strategy power;

[0054] Step S2: Obtaining the grid-connected power difference according to the total grid-connected power data and the maximum grid-connected strategy power;

[0055] Step S3: Execute the power control strategy according to the grid-connected power difference.

[0056] The power control strategy includes the following:

[0057] Get inverter data;

[0058] When the grid-connected power difference is greater than zero, the inverter power limit parameter is reduced according to the grid-connected power difference and inverter data;

[0059] When the grid-connected power difference is less than zero, the inverter power limit parameter is increased according to the grid-connected power difference and inverter data.

[0060] The inverter data includes the current power limit parameters, actual output power and rated power of each inverter.

[0061] The grid-connected power difference is calculated by the following formula:

[0062] delta = MAX_P - M_P;

[0063] Wherein, delta is the grid power difference, MAX_P is the maximum grid power, and M_P is the total grid power data. In this embodiment, the total grid power data can be obtained from the gateway table, and the maximum grid power can be set as needed.

[0064] The method of reducing the inverter power limit parameter according to the grid-connected power difference and the inverter data includes the following:

[0065] The actual output powers of the inverters are compared, and the power limit parameters of the inverters are sequentially reduced according to the grid-connected power difference; wherein the order of reduction is from the inverter with the smallest actual output power to the inverter with the largest actual output power.

[0066] Specifically, when the grid-connected power difference delta is 1500W, the current limit power parameter of inverter A is 2500W, the actual output power is 1000W, the current limit power parameter of inverter B is 3000W, and the actual output power is 2000W, the limit power of inverter A is configured to be 0W, and the limit power of inverter B is configured to be 1500W. By configuring the two inverters to reduce the power, the sum of the power parameters of inverters A and B is reduced by 1500W.

[0067] The method of increasing the inverter power limit parameter according to the grid-connected power difference and the inverter data includes the following:

[0068] Compare the output power differences of each inverter, and sequentially increase the power limit parameters of the inverters according to the grid-connected power difference; wherein, the order of increase is from the inverter with the smallest output power difference to the inverter with the largest output power difference; the output power difference is the difference between the power limit parameter and the actual output power. wherein, the actual output power of the increased inverter must be less than its maximum rated power. preferably, when the output power differences of multiple inverters are all zero, increase the inverter with a constant actual output power or a larger maximum rated power to improve the stability of the photovoltaic system and ensure that the grid-connected output tends to be constant.

[0069] When the user load power consumption increases, the grid-connected power decreases. If the grid-connected power difference delta is -1000W, for example, the rated power of inverter C is 5000W, the current power limit is 2000W, and the inverter output power is 2000W, then the power limit is lifted and adjusted upward, and the power generation is improved. The power limit of this inverter is configured to be 3000W.

[0070] Optionally, after the power limit parameter of the inverter is increased, if the grid-connected power difference delta is still negative, indicating that the power generation power needs to be increased, the inverter that meets the conditions is increased again according to the power control strategy to ensure that the maximum and optimal grid-connected output of the power generation power tends to be constant.

[0071] The power control strategy according to the grid-connected power difference includes the following:

[0072] When the grid-connected power difference delta is less than zero or greater than the regulation threshold, the power control strategy is executed.

[0073] The control threshold can be controlled based on experience according to site characteristics, etc., and is generally greater than 500W. In this embodiment, it is 1000W.

[0074] Specifically, if the maximum power value of the grid-connected strategy is 10000W, when the total grid-connected power data is greater than 10000W, the power control strategy is run; when the total grid-connected power data is less than 10000W and greater than 9000W, the power control strategy is not run; when the total grid-connected power data is less than 9000W, the power control strategy is run.

[0075] Optionally, in this embodiment, when the power control strategy is executed, the intelligent collector is connected to the inverter via a high-frequency data acquisition model.

[0076] The high-frequency data acquisition model is collected through an extended modbus model. Normally, modbus point table data is used to describe business data (such as a register for specific data description). However, due to differences in device types and manufacturers, the collector expects to read different business data point tables (register definitions are different for each manufacturer) or discontinuous data, resulting in the inability to obtain data efficiently and with low latency. This application improves the efficiency of the data collector by extending the modbus model.

[0077] Table 1:

[0078]

[0079] The intelligent collector of the present application is connected to the inverter through a high-frequency data acquisition model to be compatible with equipment from different manufacturers and effectively improve the real-time control speed.

[0080] As shown in Table 1, the specific parameters of the modbus model, the value of its function code is at least 128, and its protocol data unit PDU is at least set to two to realize the data transmission of multiple discontinuous registers. The other parameters of the high-frequency data acquisition model can be the same as the standard modbus protocol, set as needed, which is the prior art and will not be repeated in this application.

[0081] The standard modbus protocol can only read a single or multiple consecutive registers, but cannot read multiple discontinuous registers across registers. This application configures the function code and protocol data unit by extending the modbus model to realize random and flexible reading of multiple discontinuous registers across registers.

[0082] Furthermore, due to differences in device types and manufacturers, the business data point tables that the collector expects to read are generally different or discontinuous. Therefore, the standard modbus protocol cannot realize the reading of registers from multiple different manufacturers, resulting in the inability to obtain device data efficiently and with low latency. The present application extends the modbus model to realize the reading of any multiple continuous or discontinuous registers from the same manufacturer or different manufacturers on the basis of compatibility with the modbus data protocol, thereby improving the efficiency of acquiring device data and reducing data lag of the collector, so as to help the intelligent collector implement power control strategies. It solves the problem in the existing technical solution that the data collection cycle cannot meet the grid-connected control delay requirements due to the access of multiple devices from different manufacturers or different models, and realizes the mixed connection management of inverter devices with differences in point table data items from different manufacturers.

[0083] Specifically, for example, when obtaining the voltage, current, power and power limit parameters of the inverter, if the registers of this part of the data are not continuous, it may be necessary to interact through the modbus protocol communication four times. However, if the high-frequency data acquisition model after configuring the function code and protocol data unit of this application is used, it can be achieved that all the data required by a device can be read in one frame, thereby reducing the number of communication interactions between each device, improving communication efficiency, reducing communication delays, and facilitating the intelligent collector to read the inverter data in real time.

[0084] Optionally, in this embodiment, when the power limit parameter of the inverter is lowered according to the grid-connected power difference and the inverter data, or when the power limit parameter of the inverter is increased according to the grid-connected power difference and the inverter data, the intelligent collector sends a splicing broadcast command to the inverter.

[0085] This application adopts frame broadcast commands to further improve the real-time control speed of the intelligent collector and meet various grid-connected power generation laws and regulations.

[0086] Specifically, the inverter is connected to the collector through the RS485 bus, and the communication address, device serial number and device type of the inverter are configured to the collector through automatic discovery registration or manual entry during the early installation. The inverter supports intelligent collectors of the modbus protocol and supports broadcast configuration of power limit parameters. When the broadcast configuration is executed, it is necessary to match the device sequence in the broadcast data body. If the device sequence matches, it will be executed. If the device sequence does not match, it will not be executed, and the broadcast command will not be responded. Therefore, the execution command or data collection response processing is given priority, and the processing logic is executed as efficiently as possible. In all data interaction processes, a half-duplex low-latency communication processing mode should be used for fast data response, and high baud rate data collection should be supported.

[0087] The data content of the spliced ​​frame broadcast command message is: inverter serial number + power configuration information. When multiple devices are controlled, the collector will splice and send multiple configuration message frames. After the inverter receives the broadcast setting data, it will perform logical judgment. The inverter that matches the device serial number information will execute the power control of the configuration parameters, and process them one by one according to the multi-frame message, thereby efficiently ensuring the data control process.

[0088] The photovoltaic grid-connected power control method further includes: repeating step S1 to step S3. The intelligent collector determines and regulates the inverter in real time.

[0089] A photovoltaic grid-connected power control system comprises: a photovoltaic management system, an intelligent collector, a gateway meter, an inverter and other photovoltaic components.

[0090] The photovoltaic management system is deployed on the server and supports access to the intelligent collector for management, which is used for power station data display, user management and alarm file topology. In this embodiment, the photovoltaic management system is also used to issue power control strategies for the grid-connected strategies of the operational power stations. The photovoltaic management system communicates with the intelligent collector and provides other user business functions such as application settlement. This is a prior art and will not be described in detail in this application.

[0091] In this embodiment, the inverter is connected to other photovoltaic components, such as solar panels. The inverter is an important part of the grid-connected power station, supports the power station's requirements for equipment, supports RS485 communication, uses the modbus protocol for communication protocol, and also supports automatic discovery registration protocol and collector communication, supports high-frequency data collection models and broadcast power configuration framing message processing, and meets high-precision power control accuracy.

[0092] The gateway meter is a three-phase grid-connected meter for metering electric energy in the substation, and meets the high refresh and accuracy requirements of the data metering of the substation billing and grid-connected metering function, supports RS485 communication and modbus protocol and extended protocol, and supports high-frequency data acquisition models.

[0093] The intelligent collector is respectively connected to the gateway table and the inverter for communication. The intelligent collector is the master device, and the gateway table and the inverter are slave devices. In this embodiment, the intelligent collector is respectively connected to the inverter and the gateway table through the RS485 bus to manage the gateway table and the inverter. In this embodiment, the intelligent collector locally enters or automatically discovers the registered identification management equipment and the management equipment communication address, equipment type, and equipment serial number; and supports high baud rate and high frequency data collection, formulates high frequency data collection strategies according to the data required by the collector business on demand for different manufacturers or equipment types, and executes the broadcast power configuration frame to send control instructions, and communicates data through the modbus protocol. The intelligent collector is connected to Ethernet or GPRS to communicate with the photovoltaic management system to report the managed equipment information and data, and communicates with the photovoltaic management system in two-way real-time.

[0094] The intelligent collector is communicatively connected to the inverter, and is used to obtain total grid-connected power data and a maximum grid-connected power strategy value; obtain a grid-connected power difference value based on the total grid-connected power data and the maximum grid-connected power strategy value; and run a power control strategy based on the grid-connected power difference value.

[0095] The power control strategy includes the following:

[0096] Get inverter data;

[0097] When the grid-connected power difference is greater than zero, the inverter power limit parameter is reduced according to the grid-connected power difference and inverter data;

[0098] When the grid-connected power difference is less than zero, the inverter power limit parameter is increased according to the grid-connected power difference and inverter data.

[0099] On-site implementation includes the following:

[0100] Equipment is installed according to the power station plan. When installing equipment on site, the smart collector, inverter and grid-connected meter are connected through the RS485 bus to ensure the correct and optimal layout of the communication line. The smart collector is connected to the photovoltaic management system, and the equipment information is entered into the smart collector through automatic discovery registration and identification or local manual entry. The gateway meter, inverter, smart collector and photovoltaic management system are ensured to communicate through on-site wiring; users adjust the parameters of the power control strategy according to demand, the collector executes the power control strategy, the master station issues the strategy on demand according to the customer's new needs, and the system displays the data information and alarm information of the power station.

[0101] like Figure 2 As shown, the specific operation of the intelligent collector includes the following steps:

[0102] Step S401: determine whether to turn on the grid-connected power control; when the grid-connected power control is turned on, enter step S402; when the grid-connected power control is not turned on, perform equipment data collection, operation status diagnosis and report the power station operation status until the work is completed.

[0103] Step S402: Formulate a communication packaging strategy according to the device model type and the registers required for calculation. In this embodiment, the communication packaging strategy is to set the number of protocol data units (PDUs) of the high-frequency data acquisition model.

[0104] Step S403: cyclically read all device data according to the number of devices, wherein each device communicates in one frame.

[0105] Step S404: Determine whether all device data have been updated; when all device data have been updated, proceed to step S405; when all device data have not been updated, read the next device data and return to step S402.

[0106] Step S405: Execute the power control strategy.

[0107] Step S406: Determine whether the power needs to be regulated; when the power needs to be regulated, proceed to step S407; when the power does not need to be regulated, return to step S401.

[0108] Step S407: power control; when the limit is exceeded, the inverter power limit parameter is reduced according to the grid power difference and the inverter data; when the power generation needs to be increased, the inverter power limit parameter is increased according to the grid power difference and the inverter data.

[0109] Step S408: assemble frames and send frame assembly broadcast commands to the inverter, and then return to step S401.

[0110] The smart collector of the present application can enable grid-connected power control as needed. When the grid-connected power control is not enabled, it has the same functions as a common smart collector and has good adaptability.

[0111] A computer device comprises a memory, a processor and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the method.

[0112] A computer program product comprises a computer program, which implements the steps of the method when executed by a processor.

[0113] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A photovoltaic grid-connected power control method, characterized in that: Applied to the intelligent collector, including the following steps: Step S1: Obtaining total grid-connected power data and maximum grid-connected strategy power; Step S2: Obtaining the grid-connected power difference according to the total grid-connected power data and the maximum grid-connected strategy power; Step S3: Execute the power control strategy according to the grid-connected power difference; The power control strategy includes the following: Get inverter data; When the grid-connected power difference is greater than zero, the inverter power limit parameter is reduced according to the grid-connected power difference and inverter data; When the grid-connected power difference is less than zero, the inverter power limit parameter is increased according to the grid-connected power difference and inverter data.

2. The photovoltaic grid-connected power control method according to claim 1, characterized in that: The inverter data includes the current power limit parameters, actual output power and rated power of each inverter; The method of reducing the inverter power limit parameter according to the grid-connected power difference and the inverter data includes the following: Compare the actual output powers of the inverters, and sequentially reduce the power limit parameters of the inverters according to the grid-connected power difference; wherein the order of reduction is from the inverter with the smallest actual output power to the inverter with the largest actual output power; The method of increasing the inverter power limit parameter according to the grid-connected power difference and the inverter data includes the following: Compare the output power differences of each inverter, and sequentially increase the power limit parameters of the inverter according to the grid-connected power difference; wherein the order of increase is from the inverter with the smallest output power difference to the inverter with the largest output power difference; the output power difference is the difference between the power limit parameter and the actual output power.

3. The photovoltaic grid-connected power control method according to claim 2, characterized in that: The grid-connected power difference is calculated by the following formula: delta = MAX_P - M_P; Among them, delta is the grid-connected power difference, MAX_P is the maximum power of the grid-connected strategy, and M_P is the total grid-connected power data; The power control strategy according to the grid-connected power difference includes the following: When the grid-connected power difference is less than zero or greater than the regulation threshold, the power control strategy is run.

4. The photovoltaic grid-connected power control method according to claim 1, characterized in that: When the power control strategy is running, the intelligent collector is connected to the inverter through a high-frequency data acquisition model.

5. The photovoltaic grid-connected power control method according to claim 4, characterized in that: The high-frequency data acquisition model has at least two protocol data units.

6. The photovoltaic grid-connected power control method according to claim 1, characterized in that: When the inverter power limit parameter is lowered according to the grid-connected power difference and the inverter data or the inverter power limit parameter is increased according to the grid-connected power difference and the inverter data, the intelligent collector sends a splicing frame broadcast command to the inverter.

7. A photovoltaic grid-connected power control system, characterized in that: include: Inverter; An intelligent collector, the intelligent collector is communicatively connected to the inverter, and the intelligent collector is used to obtain total grid-connected power data and a maximum grid-connected strategy power; Obtaining a grid-connected power difference according to the total grid-connected power data and the maximum grid-connected strategy power; and operating a power control strategy according to the grid-connected power difference; The power control strategy includes the following: Get inverter data; When the grid-connected power difference is greater than zero, the inverter power limit parameter is reduced according to the grid-connected power difference and inverter data; When the grid-connected power difference is less than zero, the inverter power limit parameter is increased according to the grid-connected power difference and inverter data.

8. The photovoltaic grid-connected power control system according to claim 7, characterized in that: It also includes a photovoltaic management system and a gateway table; The photovoltaic management system is communicatively connected with the intelligent collector; The gateway table is in communication connection with the intelligent collector, and the gateway table is used to provide the total grid-connected power data for the intelligent collector; The inverter is provided with a plurality of them, and the intelligent collector is respectively connected to the gateway table and the inverter in communication through a high-frequency data acquisition model.

9. A computer device comprising a memory, a processor and a computer program stored in the memory, characterized in that: The processor executes the computer program to implement the steps of the method according to any one of claims 1 to 6.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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