Grid connection method and system of floating photovoltaic power station

Abstract

The invention discloses a grid connection method and system for a floating photovoltaic power station, and relates to the technical field of power grids, and the method comprises the following steps: analyzing the information of a power station, and determining a grid connection point; designing a preliminary connection scheme through grid-connected point information; and judging whether an accident occurs or not through simulation connection, and determining a final grid connection scheme. An encryption mechanism is introduced to protect data transmission between the input port and the output port, the safety problem of data in the transmission process is solved, the performance of the inverter is optimized by loading an MPPT mechanism and introducing an adjustment factor, the energy efficiency and output stability of the photovoltaic power station are improved, and the energy efficiency of the photovoltaic power station is improved. Innovative simulation environment setting can simulate diversified conditions in actual power grid operation, so that the grid connection scheme can adapt to different weather and load demand changes, an optimization strategy can be automatically developed and the grid connection scheme can be rapidly adjusted according to a simulation result, and the adaptability and flexibility of the grid connection scheme are improved.

Description

Technical Field

[0002] The present invention relates to the technical field of power grids, and in particular to a grid-connected method and system for a floating photovoltaic power station. Background Art

[0003] With the rapid development of renewable energy technology, floating photovoltaic power stations (also known as floating solar power stations) have gained increasing attention due to their ability to be deployed on water bodies. This deployment method effectively utilizes water space, reduces the occupation of land resources, and may bring additional benefits in terms of cooling effect and water quality protection.

[0004] However, the grid connection process of floating PV power stations faces a series of technical challenges. First, due to the intermittent and unstable nature of PV power generation, its grid connection may affect the stability of the power grid. Second, the existing grid connection point selection method may not fully consider the complexity and variability of the power grid, resulting in insufficient efficiency and reliability of the grid connection scheme. In addition, data security and transmission accuracy are also issues that need to be focused on during the grid connection process. Summary of the invention

[0005] In view of the problems existing in the grid connection and system of the existing floating photovoltaic power station, the present invention is proposed.

[0006] Therefore, the problem to be solved by the present invention is that the efficiency of the grid-connected solution is relatively poor.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0008] In a first aspect, an embodiment of the present invention provides a method for connecting a floating photovoltaic power station to a grid, which comprises the following steps:

[0009] Analyze power station information and determine grid connection points;

[0010] Design a preliminary connection plan based on the grid connection point information;

[0011] By simulating the connection, we can determine whether an accident has occurred and determine the final grid-connected plan.

[0012] As a preferred solution of the grid-connected method of the floating photovoltaic power station of the present invention, wherein: when analyzing the power station information, the power station information is collected;

[0013] The collected power station information includes the grid structure, substation distribution, and load distribution. The grid structure includes voltage level, load capacity, and substation capacity.

[0014] As a preferred solution of the grid-connected method of the floating photovoltaic power station of the present invention, the method of determining the grid-connected point includes:

[0015] Obtain the number of grid connection points around the power station. When the number of grid connection points is less than 2, analyze the grid connection point and the transmission network and select an appropriate grid connection method. When the number of grid connection points is not less than 2, make a secondary judgment.

[0016] Among them, the secondary judgment methods include:

[0017] Get the locations of all grid connection points, take the location of the power station as the center point, calculate the distances between all grid connection points and the power station, and arrange them in order from near to far. The distance between the farthest grid connection point and the power station is less than the distance between the transmission network and the power station.

[0018] Calculate the failure rate of all grid-connected points, where the failure rate is determined by: obtaining maintenance records of all grid-connected points, setting the query time to N days, querying the number of failures in the maintenance records within N days, and obtaining grid-connected points whose number of failures is less than the set value X;

[0019] Obtain the access point capacity of all grid connection points, determine whether the grid capacity can be increased for grid connection points with insufficient access point capacity, and remove grid connection points that cannot increase grid capacity;

[0020] A scoring mechanism is introduced to score the results of the secondary judgment, where the scoring is calculated as follows:

[0021]

[0022] Wherein, represents the total score of the grid connection point, λ represents the protection value, specifically 1 or 0, α, β and ο all represent weight values, J, G and R represent the distance score, failure rate score and access point capacity score of the grid connection point, respectively, and χ represents other scores;

[0023] Finally, based on the scores, the grid connection point with the highest score is obtained.

[0024] As a preferred solution of the grid-connected method of the floating photovoltaic power station of the present invention, the design method of the preliminary connection solution includes:

[0025] Enter the configuration end of the grid connection point, configure the input port, and configure the output port at the configuration end of the power station, and introduce an encryption mechanism for the correct transmission of the input port and the output port;

[0026] The DC power of the power station is converted into AC power through an inverter, and the MPPT mechanism is loaded to optimize the output of the power station;

[0027] Use cables to complete the transmission of electricity;

[0028] Among them, the voltage and current formula output by the MPPT mechanism is:

[0029]

[0030] Where V t and I t Represented as the voltage and current at the current time, V t+1 and I t+1 They are respectively represented as the voltage and current at the next time, ΔV and ΔI are represented as the disturbance amount;

[0031] To improve performance, the formula is updated as follows:

[0032]

[0033] In the formula, a and b represent adjustment factors. If a is greater than 1, it means increasing the step size, and if b is less than 1, it means decreasing the step size. t ) and P(I t ) represent the output power of the current voltage and current respectively, P(V t +ΔV t ) and P(I t +ΔI t ) represent the output power of the voltage and current after disturbance, ΔV t and ΔI t Expressed as the change in voltage and the change in current.

[0034] As a preferred solution of the grid-connected method of the floating photovoltaic power station of the present invention, the method of simulating connection includes:

[0035] Establish mathematical models of power plants, grid connection points and power grids in simulation software, and input the collected power plant information into the simulation software;

[0036] Then the grid connection scheme designed initially is input into the simulation software to simulate the operation of the power grid after the power station is connected to the grid;

[0037] Set up a simulation environment to analyze the operation of the power grid;

[0038] Based on the simulation results, the optimization strategy is developed and the grid connection scheme is adjusted.

[0039] As a preferred solution of the grid-connected method of the floating photovoltaic power station of the present invention, wherein: setting the simulation environment includes weather conditions, load demand and grid operation mode;

[0040] When setting the weather conditions of the simulation environment, the past weather information of the power station is collected, and the simulation environment is set according to the weather information;

[0041] Methods for analyzing power grid operation include:

[0042] Clean the data, remove outliers and noise, and perform data conversion and standardization;

[0043] By changing weather conditions, determine whether the parameters of power grid operation are stable;

[0044] By adjusting the load demand, it is possible to determine whether the parameters of the power grid operation are stable.

[0045] As a preferred solution of the grid-connected method of the floating photovoltaic power station of the present invention, the method of judging whether the parameters of the grid operation are stable includes:

[0046] Set the fluctuation range [x, y], set the test duration S, determine the maximum and minimum values ​​of the parameters of the power grid operation within the test duration S, and then calculate the difference between the maximum and minimum values. When the difference is within the fluctuation range [x, y], it is determined that the power grid is operating normally. When the difference is not within the fluctuation range [x, y], it is determined whether the difference that is not within the fluctuation range [x, y] is greater than 1. When it is not greater than 1, analyze the cause of the abnormality and give a solution. When it is greater than 1, adjust the preliminary connection plan and retest through the simulation software until the test passes.

[0047] In a second aspect, an embodiment of the present invention provides a grid-connected system for a floating photovoltaic power station, comprising:

[0048] In a third aspect, an embodiment of the present invention provides a computer device, including a memory and a processor, wherein the memory stores a computer program, wherein: when the processor executes the computer program, any step of the above-mentioned method for connecting a floating photovoltaic power station to the grid is implemented.

[0049] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein: when the computer program is executed by a processor, any step of the above-mentioned method for connecting a floating photovoltaic power station to the grid is implemented.

[0050] The beneficial effects of the present invention are as follows: an encryption mechanism is introduced to protect data transmission between the input port and the output port, the present invention solves the security problem of data during transmission, and optimizes inverter performance by loading the MPPT mechanism and introducing an adjustment factor. The present invention improves the energy efficiency and output stability of the photovoltaic power station. The innovative simulation environment setting can simulate the diverse conditions in actual power grid operation, so that the grid-connected solution can adapt to different weather and load demand changes, and according to the simulation results, it can automatically develop optimization strategies and quickly adjust the grid-connected solution, thereby improving the adaptability and flexibility of the grid-connected solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0052] Figure 1 Scenario diagram of the grid-connected method of a floating photovoltaic power station. DETAILED DESCRIPTION

[0053] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0054] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0055] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0056] The present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0057] At the same time, in the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper, lower, inner and outer" are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first, second or third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0058] In the present invention, unless otherwise clearly specified and limited, the terms "install, connect, connect" should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection or an integral connection; it can also be a mechanical connection, an electrical connection or a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] Example 1

[0060] Reference Figure 1 , which is the first embodiment of the present invention, and provides a method for connecting a floating photovoltaic power station to the grid, comprising the following steps:

[0061] S1. Analyze power station information and determine the grid connection point.

[0062] When analyzing the power station information, collecting the power station information;

[0063] The collected power station information includes the grid structure, substation distribution, and load distribution. The grid structure includes voltage level, load capacity, and substation capacity.

[0064] Methods for determining the grid connection point include:

[0065] Obtain the number of grid connection points around the power station. When the number of grid connection points is less than 2, analyze the grid connection point and the transmission network and select an appropriate grid connection method. When the number of grid connection points is not less than 2, make a secondary judgment.

[0066] Among them, the secondary judgment methods include:

[0067] Get the locations of all grid connection points, take the location of the power station as the center point, calculate the distances between all grid connection points and the power station, and arrange them in order from near to far. The distance between the farthest grid connection point and the power station is less than the distance between the transmission network and the power station.

[0068] Calculate the failure rate of all grid-connected points, where the failure rate is determined by: obtaining maintenance records of all grid-connected points, setting the query time to N days, querying the number of failures in the maintenance records within N days, and obtaining grid-connected points whose number of failures is less than the set value X;

[0069] Obtain the access point capacity of all grid connection points, determine whether the grid capacity can be increased for grid connection points with insufficient access point capacity, and remove grid connection points that cannot increase grid capacity;

[0070] A scoring mechanism is introduced to score the results of the secondary judgment, where the scoring is calculated as follows:

[0071]

[0072] Wherein, represents the total score of the grid connection point, λ represents the protection value, specifically 1 or 0, α, β and ο all represent weight values, J, G and R represent the distance score, failure rate score and access point capacity score of the grid connection point, respectively, and χ represents other scores;

[0073] Finally, according to the scores, the highest scoring grid connection point is obtained;

[0074] For example, the geographical coordinates of the power station are determined, and five possible grid connection points A, B, C, D and E are identified. The distance between each grid connection point and the power station is B (2km), C (3km), A (4km), D (5km) and E (10km). The distance from the transmission network to the power station is set to 7km, so the grid connection point E needs to be excluded, and the grid connection points are arranged in order according to the distance. The closer the distance, the higher the score. Then the maintenance records of each grid connection point in the past N days (180 days) are collected, and the number of faults is calculated. Assuming that the set number of faults is 3 times, the grid connection points with more than 3 faults are excluded. Then the access capacity of each grid connection point is checked to determine whether it meets the output requirements of the power station. If the capacity of grid connection points A and D is insufficient, they need to be upgraded. Assuming that grid connection point A cannot increase the grid capacity, it is removed from the candidate list. Finally, all grid connection points are scored to obtain the grid connection point with the highest score. When scoring, if a grid connection point is judged to be non-compliant, its protection value is set to 0, that is, no score.

[0075] S2. Design a preliminary connection plan based on the grid connection point information.

[0076] The design method of the preliminary connection scheme includes:

[0077] Enter the configuration end of the grid connection point, configure the input port, and configure the output port at the configuration end of the power station, and introduce an encryption mechanism for the correct transmission of the input port and the output port;

[0078] The DC power of the power station is converted into AC power through an inverter, and the MPPT mechanism is loaded to optimize the output of the power station;

[0079] Use cables to complete the transmission of electricity;

[0080] Among them, the voltage and current formula output by the MPPT mechanism is:

[0081]

[0082] Where V t and I t Represented as the voltage and current at the current time, V t+1 and I t+1They are respectively represented as the voltage and current at the next time, ΔV and ΔI are represented as the disturbance amount;

[0083] To improve performance, the formula is updated as follows:

[0084]

[0085] In the formula, a and b represent adjustment factors. If a is greater than 1, it means increasing the step size, and if b is less than 1, it means decreasing the step size. t ) and P(I t ) represent the output power of the current voltage and current respectively, P(V t +ΔV t ) and P(I t +ΔI t ) represent the output power of the voltage and current after disturbance, ΔV t and ΔI t Expressed as the change in voltage and the change in current.

[0086] S3. Through simulated connection, determine whether an accident occurs and determine the final grid connection plan.

[0087] The method of simulating connection includes:

[0088] Establish mathematical models of power plants, grid connection points and power grids in simulation software, and input the collected power plant information into the simulation software;

[0089] Then the grid connection scheme designed initially is input into the simulation software to simulate the operation of the power grid after the power station is connected to the grid;

[0090] Set up a simulation environment to analyze the operation of the power grid;

[0091] Setting up the simulation environment including weather conditions, load demands and grid operation modes;

[0092] When setting the weather conditions of the simulation environment, the past weather information of the power station is collected, and the simulation environment is set according to the weather information;

[0093] Methods for analyzing power grid operation include:

[0094] Clean the data, remove outliers and noise, and perform data conversion and standardization;

[0095] By changing weather conditions, determine whether the parameters of power grid operation are stable;

[0096] By adjusting the load demand, it is possible to determine whether the parameters of the power grid operation are stable.

[0097] Based on the simulation results, the optimization strategy is developed and the grid connection scheme is adjusted.

[0098] Methods for determining whether the parameters of power grid operation are stable include:

[0099] Set the fluctuation range [x, y], set the test duration S, determine the maximum and minimum values ​​of the parameters of the power grid operation within the test duration S, and then calculate the difference between the maximum and minimum values. When the difference is within the fluctuation range [x, y], it is determined that the power grid is operating normally. When the difference is not within the fluctuation range [x, y], it is determined whether the difference that is not within the fluctuation range [x, y] is greater than 1. If it is not greater than 1, analyze the cause of the abnormality and provide a solution. If it is greater than 1, adjust the preliminary connection plan and retest through the simulation software until the test passes.

[0100] For example, when judging the voltage, set the voltage fluctuation range, such as the maximum value is 1.05pu and the minimum is 0.9pu, and set the duration to 10 days. Compare the difference between each parameter and the set fluctuation range. If the difference is greater than 1 unit, it indicates that there are major problems in the operation of the power grid and the preliminary connection plan needs to be adjusted, such as changing the grid connection point, increasing reactive compensation, adjusting inverter settings, etc. After adjusting the connection plan, rerun the simulation software and perform stability testing again.

[0101] In summary, the encryption mechanism is introduced to protect the data transmission between the input port and the output port. The present invention solves the security problem of data during transmission. By loading the MPPT mechanism and introducing the adjustment factor to optimize the inverter performance, the present invention improves the energy efficiency and output stability of the photovoltaic power station. The innovative simulation environment setting can simulate the diverse conditions in the actual power grid operation, so that the grid-connected solution can adapt to different weather and load demand changes, and according to the simulation results, it can automatically develop optimization strategies and quickly adjust the grid-connected solution, thereby improving the adaptability and flexibility of the grid-connected solution.

[0102] Example 2

[0103] On the basis of the first embodiment, this embodiment further provides a grid-connected system for a floating photovoltaic power station, comprising an information collection module, an analysis module, an encryption transmission module, and a simulation module;

[0104] The information collection module collects infrastructure information related to the power station, including the grid structure, substation distribution, load distribution, etc., to provide basic data for the grid connection plan;

[0105] The analysis module is used to analyze the number and characteristics of grid connection points around the power station and determine the appropriate grid connection method;

[0106] The encryption transmission module ensures the security of data transmission between the power station and the grid connection point, preventing the data from being accessed or tampered with by unauthorized persons;

[0107] The simulation module establishes mathematical models of power stations, grid connection points and power grids in the simulation software, providing a basis for simulating the operation of the power grid after grid connection.

[0108] This embodiment also provides a computer device, which is applicable to the grid-connected method of a floating photovoltaic power station, and includes a memory and a processor; the memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions to implement the grid-connected method of the floating photovoltaic power station proposed in the above embodiment.

[0109] The computer device may be a terminal, and the computer device includes a processor, a memory, a communication interface, a display screen and an input device connected via a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be achieved through WIFI, an operator network, NFC (near field communication) or other technologies. The display screen of the computer device may be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device may be a touch layer covering the display screen, or a key, trackball or touchpad provided on the housing of the computer device, or an external keyboard, touchpad or mouse, etc.

[0110] This embodiment further provides a storage medium on which a computer program is stored. When the program is executed by a processor, the method for connecting a floating photovoltaic power station to the grid as proposed in the above embodiment is implemented.

[0111] The storage medium proposed in this embodiment and the data storage method proposed in the above embodiment belong to the same inventive concept. The technical details not fully described in this embodiment can be found in the above embodiment, and this embodiment has the same beneficial effects as the above embodiment.

[0112] Example 3

[0113] On the basis of the previous two embodiments, this embodiment provides a method for connecting a floating photovoltaic power station to the grid. In order to verify the beneficial effects of the present invention, scientific demonstration is carried out through economic benefit calculation and simulation experiments.

[0114] Solution A: Use the traditional method to select the grid connection point

[0115] Solution B: Using the grid connection point selected by the present invention

[0116] Test conditions: The fluctuation range is set to ±5%, the test duration is set to 10 days, and key parameters of power grid operation, such as node voltage, frequency, line load, etc., are collected;

[0117] The details are shown in the following table:

[0118] parameter Plan A Plan B Improvement rate Node voltage fluctuation range ±6.5％ ±4.5％ 30.77％ Frequency stability (max / min) 49.5Hz / 50.5Hz 49.9Hz / 50.1Hz 1.00％ Maximum line load difference 150MW 120MW 20.00％ Simulation test pass times 3 / 5 5 / 5 66.67％

[0119] It can be seen from the table that the grid connection point selected by the method of the present invention (Scheme B) is superior to the traditional method (Scheme A) in key parameters such as voltage fluctuation range, frequency stability, line load difference and number of faults. The improved Scheme B further optimizes the power grid performance, reduces the voltage fluctuation range, improves the frequency stability, makes the line load more balanced, reduces the number of faults, and significantly improves the simulation test pass rate, indicating that the method of the present invention can effectively improve the stability and reliability of the power grid.

[0120] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for connecting a floating photovoltaic power station to the grid, characterized in that: The following steps are included: Analyze power station information and determine grid connection points; Design a preliminary connection plan based on the grid connection point information; By simulating the connection, we can determine whether an accident has occurred and determine the final grid-connected plan.

2. The method for connecting a floating photovoltaic power station to the grid according to claim 1, characterized in that: When analyzing the power station information, collecting the power station information; The collected power station information includes the grid structure, substation distribution, and load distribution. The grid structure includes voltage level, load capacity, and substation capacity.

3. The grid-connected method of a floating photovoltaic power station according to claim 2, characterized in that: Methods for determining the grid connection point include: Obtain the number of grid connection points around the power station. When the number of grid connection points is less than 2, analyze the grid connection point and the transmission network and select an appropriate grid connection method. When the number of grid connection points is not less than 2, make a secondary judgment. Among them, the secondary judgment methods include: Get the locations of all grid connection points, take the location of the power station as the center point, calculate the distances between all grid connection points and the power station, and arrange them in order from near to far. The distance between the farthest grid connection point and the power station is less than the distance between the transmission network and the power station. Calculate the failure rate of all grid-connected points, where the failure rate is determined by: obtaining maintenance records of all grid-connected points, setting the query time to N days, querying the number of failures in the maintenance records within N days, and obtaining grid-connected points whose number of failures is less than the set value X; Obtain the access point capacity of all grid connection points, determine whether the grid capacity can be increased for grid connection points with insufficient access point capacity, and remove grid connection points that cannot increase grid capacity; A scoring mechanism is introduced to score the results of the secondary judgment, where the scoring is calculated as follows: Wherein, represents the total score of the grid connection point, λ represents the protection value, specifically 1 or 0, α, β and ο all represent weight values, J, G and R represent the distance score, failure rate score and access point capacity score of the grid connection point, respectively, and χ represents other scores; Finally, based on the scores, the grid connection point with the highest score is obtained.

4. The method for connecting a floating photovoltaic power station to the grid according to claim 3, characterized in that: The design method of the preliminary connection scheme includes: Enter the configuration end of the grid connection point, configure the input port, and configure the output port at the configuration end of the power station, and introduce an encryption mechanism for the correct transmission of the input port and the output port; The DC power of the power station is converted into AC power through an inverter, and the MPPT mechanism is loaded to optimize the output of the power station; Use cables to complete the transmission of electricity; Among them, the voltage and current formula output by the MPPT mechanism is: Where V t and I t Represented as the voltage and current at the current time, V t+1 and I t+1 They are respectively represented as the voltage and current at the next time, ΔV and ΔI are represented as the disturbance amount; To improve performance, the formula is updated as follows: In the formula, a and b represent adjustment factors. If a is greater than 1, it means increasing the step size, and if b is less than 1, it means decreasing the step size. t ) and P(I t ) represent the output power of the current voltage and current respectively, P(V t +ΔV t ) and P(I t +ΔI t ) represent the output power of the voltage and current after disturbance, ΔV t and ΔI t Expressed as the change in voltage and the change in current.

5. The grid-connected method of a floating photovoltaic power station according to claim 4, characterized in that: The method of simulating connection includes: Establish mathematical models of power plants, grid connection points and power grids in simulation software, and input the collected power plant information into the simulation software; Then the grid connection scheme designed initially is input into the simulation software to simulate the operation of the power grid after the power station is connected to the grid; Set up a simulation environment to analyze the operation of the power grid; Based on the simulation results, the optimization strategy is developed and the grid connection scheme is adjusted.

6. The method for connecting a floating photovoltaic power station to the grid according to claim 5, characterized in that: Setting up the simulation environment including weather conditions, load demands and grid operation modes; When setting the weather conditions of the simulation environment, the past weather information of the power station is collected, and the simulation environment is set according to the weather information; Methods for analyzing power grid operation include: Clean the data, remove outliers and noise, and perform data conversion and standardization; By changing weather conditions, determine whether the parameters of power grid operation are stable; By adjusting the load demand, it is possible to determine whether the parameters of the power grid operation are stable.

7. The grid-connected method of a floating photovoltaic power station according to claim 6, characterized in that: Methods for determining whether the parameters of power grid operation are stable include: Set the fluctuation range [x, y], set the test duration S, determine the maximum and minimum values ​​of the parameters of the power grid operation within the test duration S, and then calculate the difference between the maximum and minimum values. When the difference is within the fluctuation range [x, y], it is determined that the power grid is operating normally. When the difference is not within the fluctuation range [x, y], it is determined whether the difference that is not within the fluctuation range [x, y] is greater than 1. When it is not greater than 1, analyze the cause of the abnormality and give a solution. When it is greater than 1, adjust the preliminary connection plan and retest through the simulation software until the test passes.

8. A grid-connected system for a floating photovoltaic power station, based on the grid-connected method for a floating photovoltaic power station according to any one of claims 1 to 7, characterized in that: It includes information collection module, analysis module, encryption transmission module, and simulation module; The information collection module collects infrastructure information related to the power station, including the grid structure, substation distribution, load distribution, etc., to provide basic data for the grid connection plan; The analysis module is used to analyze the number and characteristics of grid connection points around the power station and determine the appropriate grid connection method; The encryption transmission module ensures the security of data transmission between the power station and the grid connection point, preventing the data from being accessed or tampered with by unauthorized persons; The simulation module establishes mathematical models of power stations, grid connection points and power grids in the simulation software, providing a basis for simulating the operation of the power grid after grid connection.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method for connecting a floating photovoltaic power station to the grid according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for connecting a floating photovoltaic power station to the grid according to any one of claims 1 to 7 are implemented.

Images