Frequency modulation method for photovoltaic power station

Abstract

The invention discloses a frequency modulation method for a photovoltaic power station in the technical field of photovoltaic power stations. The frequency modulation method comprises the following steps: S1, acquiring power station parameters of a target photovoltaic power station; s2, analyzing according to the photovoltaic parameters to obtain a frequency modulation trigger mechanism; judging a power station operation mode of the target photovoltaic power station according to the frequency modulation trigger mechanism and the power grid parameters; s3, if the operation mode of the power station is the maximum power generation mode, the target photovoltaic power station operates according to the maximum output power; s4, if the power station operation mode is a frequency modulation mode, power station adjustment power of the target photovoltaic power station is obtained through analysis according to the power grid parameters and the power grid parameter threshold value; s5, setting a time scale interval, and analyzing according to the power adjustment time of the power station adjustment power and the time scale interval to obtain a target power station frequency modulation strategy of the power station adjustment power; and S6, the target photovoltaic power station carries out photovoltaic power station frequency modulation according to the power station adjustment power and the target power station frequency modulation strategy. The frequency modulation accuracy of the photovoltaic power station is improved.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic power plant technology, and specifically to a frequency regulation method for photovoltaic power plants. Background Technology

[0002] As the global energy structure transitions towards clean and low-carbon energy, photovoltaic (PV) power generation, with its clean and renewable advantages, has seen its installed capacity and grid penetration rate continuously increase, becoming an important power source in the power system. However, PV power output is significantly affected by natural factors such as solar irradiance, cloud cover, temperature, and precipitation, exhibiting inherent characteristics of intermittency, fluctuation, and randomness. For example, short-term strong cloud cover can cause a sharp drop in PV power plant output within a short period, while output quickly recovers after the clouds dissipate. Furthermore, at night or during cloudy or rainy weather, PV output can even approach zero. This output fluctuation affects the balance of active power supply and demand in the PV power grid, causing the grid frequency to deviate from its rated value. When the frequency deviation exceeds the allowable range, it will cause abnormal operation of electrical equipment, and in severe cases, even lead to major accidents such as grid disconnection and large-scale power outages.

[0003] The frequency regulation methods for photovoltaic power plants in related technologies often fail to accurately determine whether frequency regulation is needed based on the power plant parameters, nor can they determine the frequency regulation power value and frequency regulation method based on the power plant parameters. This results in low accuracy of frequency regulation for photovoltaic power plants and requires improvement. Summary of the Invention

[0004] The purpose of this application is to provide a frequency regulation method for photovoltaic power plants, so as to improve the problem that the frequency regulation methods of photovoltaic power plants in the related art often cannot accurately determine whether the photovoltaic power plant needs to be regulated based on the power plant parameters, nor can they determine the frequency regulation power value and frequency regulation method of the photovoltaic power plant based on the power plant parameters, resulting in low accuracy of frequency regulation of photovoltaic power plants.

[0005] This application provides a frequency regulation method for photovoltaic power plants, including: Step S1: Obtain the power station parameters of the target photovoltaic power station, including the grid parameters of the power grid in the target photovoltaic power station and the photovoltaic parameters of the photovoltaic inverter; Step S2: Based on the photovoltaic parameters, the frequency regulation triggering mechanism of the target photovoltaic power station is obtained; the frequency regulation triggering mechanism and the grid parameters are compared and analyzed to determine and obtain the power station operation mode of the target photovoltaic power station, wherein the power station operation mode includes the maximum power generation mode and the frequency regulation mode; Step S3: If the target photovoltaic power station operates in maximum power generation mode, then the target photovoltaic power station operates according to the maximum output power in the photovoltaic parameters; Step S4: If the target photovoltaic power station operates in frequency regulation mode, the grid parameters are compared and analyzed with the preset grid parameter thresholds to obtain the power station adjustment power of the target photovoltaic power station. Step S5: Set a time scale interval, each time scale interval corresponding to a power supply strategy; obtain the power adjustment time corresponding to the power adjustment of the power station, and analyze the target power station frequency regulation strategy based on the power adjustment time and the time scale interval. Step S6: Based on the power adjustment of the power station and the frequency regulation strategy of the target power station, perform frequency regulation of the target photovoltaic power station.

[0006] Furthermore, the power plant parameters include the grid parameters of the power grid in the target photovoltaic power plant and the photovoltaic parameters of the photovoltaic inverter, specifically: The photovoltaic parameters include real-time output power and maximum output power; the grid parameters include grid frequency change rate and grid frequency change deviation.

[0007] Furthermore, based on the photovoltaic parameters, the frequency regulation triggering mechanism of the target photovoltaic power station is obtained, specifically as follows: Set an output power benchmark range, and each output power benchmark range has a corresponding frequency modulation triggering mechanism; The real-time output power of the target photovoltaic power station is compared with the output power benchmarking range to obtain the output power benchmarking range corresponding to the real-time output power, and the frequency modulation triggering mechanism corresponding to the output power benchmarking range is recorded as the frequency modulation triggering mechanism of the target photovoltaic power station. The frequency regulation triggering mechanism includes the range of the power grid frequency change rate, the range of the power grid frequency change deviation, and the threshold of the change duration period.

[0008] Furthermore, by comparing and analyzing the frequency regulation triggering mechanism and grid parameters, the operating mode of the target photovoltaic power station is determined and obtained, specifically as follows: Obtain the duration of the rate of change of the power grid frequency change rate in the power grid parameters; obtain the duration of the deviation of the power grid frequency change in the power grid parameters; If the grid frequency change rate in the grid parameters is within the range of the grid frequency change rate and the duration of the change rate is greater than the change duration period threshold, then the target photovoltaic power station is determined to meet the first frequency regulation triggering condition. If the grid frequency change deviation in the grid parameters is within the range of grid frequency change deviation, and the duration of the change deviation is greater than the change duration period threshold, then the target photovoltaic power station is determined to meet the second frequency regulation triggering condition. If the target photovoltaic power station does not simultaneously meet the first frequency regulation triggering condition and the second frequency regulation triggering condition, then the power station operation mode of the target photovoltaic power station is determined to be the maximum power generation mode; if the target photovoltaic power station simultaneously meets the first frequency regulation triggering condition and the second frequency regulation triggering condition, then the power station operation mode of the target photovoltaic power station is determined to be the frequency regulation mode.

[0009] Furthermore, if the target photovoltaic power station operates in frequency regulation mode, the grid parameters are compared and analyzed with preset grid parameter thresholds to obtain the power station adjustment power of the target photovoltaic power station, specifically: The power grid parameter thresholds include the power grid frequency change rate threshold and the power grid frequency change deviation threshold; The first output power of the target photovoltaic power station is obtained by comparing the grid frequency change rate in the grid parameters with the frequency change rate threshold; the second output power of the target photovoltaic power station is obtained by comparing the grid frequency change deviation in the grid parameters with the frequency change deviation threshold. The power adjustment power of the target photovoltaic power station is obtained by integrating the first output power and the second output power.

[0010] Furthermore, the grid frequency change rate in the grid parameters is compared with the frequency change rate threshold to obtain the first output power of the target photovoltaic power station, specifically: If the grid frequency change rate of the target photovoltaic power station is less than or equal to the grid frequency change rate threshold, then the first output frequency regulation of the target photovoltaic power station is not required; if the grid frequency change rate of the target photovoltaic power station is greater than the frequency change rate threshold, then the first output frequency regulation of the target photovoltaic power station is required. The inertial time constant and inverter rated capacity of the target photovoltaic power station are obtained, and the first output power of the target photovoltaic power station is obtained by multiplying the inertial time constant, inverter rated capacity and grid frequency change rate. When the grid frequency change rate of the target photovoltaic power station is negative, the first output frequency regulation of the target photovoltaic power station is to increase the first output power; when the grid frequency change rate of the target photovoltaic power station is positive, the first output frequency regulation of the target photovoltaic power station is to decrease the first output power.

[0011] Furthermore, by comparing the grid frequency variation deviation from the grid parameters with the frequency variation deviation threshold, the second output power of the target photovoltaic power station is obtained, specifically: If the grid frequency variation deviation of the target photovoltaic power station is less than or equal to the grid frequency variation deviation threshold, then no second output frequency regulation is required for the target photovoltaic power station; if the grid frequency variation deviation of the target photovoltaic power station is greater than the grid frequency variation deviation threshold, then the second output frequency regulation is required for the target photovoltaic power station. Obtain the damping coefficient of the target photovoltaic power station, and obtain the second output power of the target photovoltaic power station based on the product of the damping coefficient and the deviation of the grid frequency change; Obtain the rated deviation value of the target photovoltaic power station; if the deviation of the grid frequency change of the target photovoltaic power station is less than the rated deviation value, the second output frequency regulation of the target photovoltaic power station is to increase the second output power; if the deviation of the grid frequency change of the target photovoltaic power station is greater than the rated deviation value, the second output frequency regulation of the target photovoltaic power station is to decrease the second output power.

[0012] Further, step S5 specifically includes: The target photovoltaic power plant includes at least one time scale interval, and the time scale interval also corresponds to an adjustment power category, which corresponds to the power supply strategy. The adjustment power categories include instantaneous adjustment power, continuous adjustment power, and long-term adjustment power; The power adjustment time is compared with the time scale interval to obtain the time comparison result. Based on the time comparison result, the power adjustment power of the power station corresponding to the power adjustment time is classified into adjustment power categories to obtain the adjustment power category corresponding to the power station adjustment power. The power supply strategy corresponding to the power adjustment category is recorded as the target power station frequency regulation strategy for power station power adjustment.

[0013] Furthermore, the power supply strategy corresponding to the adjusted power category is denoted as the target power station frequency regulation strategy for power station power adjustment, specifically: If the power adjustment category corresponding to the power adjustment power of the power station is instantaneous power adjustment, then the power value corresponding to the power station adjustment power is output according to the energy storage unit of the target photovoltaic power station. If the power adjustment category corresponding to the power adjustment of the power station is continuous power adjustment, then the power value corresponding to the power adjustment of the power station is output according to the energy storage unit and photovoltaic inverter of the target photovoltaic power station. If the power adjustment category corresponding to the power adjustment power of the power station is long-term adjustment power, then the power value corresponding to the power station adjustment power output by the photovoltaic inverter of the target photovoltaic power station shall be based on the power value of the power station adjustment power.

[0014] Further, step S6 specifically includes: Obtain the frequency regulation time corresponding to the power adjustment of the power station, and construct the frequency regulation power trajectory of the target photovoltaic power station based on the frequency regulation time and the power adjustment power of the power station; Frequency regulation of the target photovoltaic power station is carried out based on the frequency regulation power trajectory and the target power station frequency regulation strategy.

[0015] In summary, the beneficial effects of this application are as follows: This application obtains the power plant parameters of the target photovoltaic power plant, including the grid parameters of the power grid and the photovoltaic parameters of the photovoltaic inverter; analyzes the photovoltaic parameters to obtain the frequency regulation triggering mechanism of the target photovoltaic power plant; and compares and analyzes the frequency regulation triggering mechanism with the grid parameters to determine and obtain the power plant operation mode of the target photovoltaic power plant, wherein the power plant operation mode includes maximum power generation mode and frequency regulation mode; wherein, if the power plant operation mode of the target photovoltaic power plant is maximum power generation mode, the target photovoltaic power plant operates according to the maximum output power in the photovoltaic parameters; if the power plant operation mode of the target photovoltaic power plant is frequency regulation mode, the grid... The parameters are compared and analyzed with preset grid parameter thresholds to obtain the power adjustment power of the target photovoltaic power station; a time scale interval is set, and each time scale interval corresponds to a power supply strategy; the power adjustment time corresponding to the power adjustment power is obtained, and the target power station frequency regulation strategy is obtained based on the power adjustment time and the time scale interval analysis; the target photovoltaic power station performs frequency regulation based on the power adjustment power and the target power station frequency regulation strategy, so as to accurately determine whether the photovoltaic power station needs frequency regulation based on the power station parameters, and also to determine the frequency regulation power value and frequency regulation method required for the photovoltaic power station based on the power station parameters, thereby improving the accuracy of photovoltaic power station frequency regulation. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, some of the accompanying drawings in the embodiments of this application will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be considered as a limitation on the scope of this application.

[0017] Figure 1 This is a flowchart illustrating a frequency regulation method for a photovoltaic power plant provided in this application. Detailed Implementation

[0018] The following examples and... Figure 1 This application will be described in further detail, but the implementation of this application is not limited thereto.

[0019] Reference Figure 1 The diagram shown is a flowchart illustrating a frequency regulation method for a photovoltaic power station provided in an embodiment of this application.

[0020] A frequency regulation method for a photovoltaic power plant, comprising: Step S1: Obtain the power plant parameters of the target photovoltaic power plant, including the grid parameters of the power grid in the target photovoltaic power plant and the photovoltaic parameters of the photovoltaic inverter; Step S2: Based on the photovoltaic parameter analysis, obtain the frequency regulation triggering mechanism of the target photovoltaic power station; compare and analyze the frequency regulation triggering mechanism and the grid parameters to determine and obtain the power station operation mode of the target photovoltaic power station, wherein the power station operation mode includes the maximum power generation mode and the frequency regulation mode; Step S3: If the target photovoltaic power station operates in maximum power generation mode, the target photovoltaic power station will operate according to the maximum output power in the photovoltaic parameters. Step S4: If the target photovoltaic power station operates in frequency regulation mode, the grid parameters are compared and analyzed with the preset grid parameter thresholds to obtain the power station adjustment power of the target photovoltaic power station. Step S5: Set time scale intervals, each time scale interval corresponds to a power supply strategy; obtain the power adjustment time corresponding to the power adjustment of the power plant, and analyze the target power plant frequency regulation strategy based on the power adjustment time and time scale interval. Step S6: Based on the power adjustment of the power station and the frequency regulation strategy of the target power station, perform frequency regulation of the target photovoltaic power station.

[0021] The power plant parameters include the grid parameters of the power grid in the target photovoltaic power plant and the photovoltaic parameters of the photovoltaic inverter, specifically: Photovoltaic parameters include real-time output power and maximum output power; grid parameters include grid frequency change rate and grid frequency change deviation.

[0022] Based on photovoltaic parameter analysis, the frequency regulation triggering mechanism of the target photovoltaic power station is obtained as follows: Set the output power benchmark range, and each output power benchmark range has a corresponding frequency modulation trigger mechanism; The real-time output power of the target photovoltaic power station is compared with the output power benchmarking range to obtain the output power benchmarking range corresponding to the real-time output power, and the frequency modulation triggering mechanism corresponding to the output power benchmarking range is recorded as the frequency modulation triggering mechanism of the target photovoltaic power station. The frequency regulation triggering mechanism includes the range of the power grid frequency change rate, the range of the power grid frequency change deviation, and the threshold of the change duration period.

[0023] In some embodiments, the output power benchmark range can be set to be greater than or equal to 80% of the rated power or less than or equal to 30% of the rated power, where the rated power can be obtained based on the actual operating parameters of the photovoltaic power station. In practical applications, when the output power benchmark range is greater than or equal to 80% of the rated power, the frequency modulation triggering mechanism can be set to a grid frequency change rate range where the absolute value of the grid frequency change rate is greater than 0.02Hz, a grid frequency change deviation range where the absolute value of the grid frequency change deviation is greater than 0.1Hz / s, and a change duration period threshold of two grid cycles. When the output power benchmark range is less than or equal to 30% of the rated power, the frequency modulation triggering mechanism can be set to a grid frequency change rate range where the absolute value of the grid frequency change rate is greater than 0.07Hz, a grid frequency change deviation range where the absolute value of the grid frequency change deviation is greater than 0.5Hz / s, and a change duration period threshold of 6 grid cycles.

[0024] By comparing and analyzing the frequency regulation triggering mechanism and grid parameters, the operating mode of the target photovoltaic power station is determined and obtained, specifically: Obtain the duration of the rate of change of the power grid frequency change rate in the power grid parameters; obtain the duration of the deviation of the power grid frequency change in the power grid parameters; If the grid frequency change rate in the grid parameters is within the range of the grid frequency change rate and the duration of the change rate is greater than the change duration period threshold, then the target photovoltaic power station is judged to meet the first frequency regulation triggering condition. If the grid frequency change deviation in the grid parameters is within the range of grid frequency change deviation, and the duration of the change deviation is greater than the change duration period threshold, then the target photovoltaic power station is judged to meet the second frequency regulation triggering condition. If the target photovoltaic power station does not simultaneously meet the first frequency regulation triggering condition and the second frequency regulation triggering condition, then the power station operation mode of the target photovoltaic power station is determined to be the maximum power generation mode; if the target photovoltaic power station simultaneously meets the first frequency regulation triggering condition and the second frequency regulation triggering condition, then the power station operation mode of the target photovoltaic power station is determined to be the frequency regulation mode.

[0025] In some embodiments, the duration of the rate of change and the duration of the deviation are both measured in grid cycles. For example, the duration of the rate of change can be two grid cycles, and the duration of the deviation can be four grid cycles. The grid cycle is preset according to the actual operating parameters of the target photovoltaic power station, such as 1 hour or 2 hours.

[0026] If the target photovoltaic power station operates in frequency regulation mode, the grid parameters are compared and analyzed with preset grid parameter thresholds to obtain the power station adjustment power of the target photovoltaic power station, specifically: Grid parameter thresholds include the grid frequency change rate threshold and the grid frequency change deviation threshold; The first output power of the target photovoltaic power station is obtained by comparing the grid frequency change rate in the grid parameters with the frequency change rate threshold; the second output power of the target photovoltaic power station is obtained by comparing the grid frequency change deviation in the grid parameters with the frequency change deviation threshold. The power adjustment power of the target photovoltaic power station is obtained by integrating the first output power and the second output power.

[0027] In some embodiments, the inertial response of the target photovoltaic power station is initiated based on the first output power; the damping control of the target photovoltaic power station is initiated based on the second output power, working in conjunction with the inertial response. Power integration based on the first output power and the second output power means adding the first output power and the second output power together. In addition, if the first output power needs to be increased in actual application, the power value of the first output power is positive; if the first output power needs to be decreased in actual application, the power value of the first output power is negative. Similarly, if the second output power needs to be increased in actual application, the power value of the second output power is positive; if the second output power needs to be decreased in actual application, the power value of the second output power is negative.

[0028] The first output power of the target photovoltaic power station is obtained by comparing the grid frequency change rate in the grid parameters with the frequency change rate threshold. Specifically: If the grid frequency change rate of the target photovoltaic power station is less than or equal to the grid frequency change rate threshold, then no first output frequency regulation is required for the target photovoltaic power station; if the grid frequency change rate of the target photovoltaic power station is greater than the frequency change rate threshold, then the first output frequency regulation is required for the target photovoltaic power station. The inertial time constant and inverter rated capacity of the target photovoltaic power station are obtained, and the first output power of the target photovoltaic power station is obtained by multiplying the inertial time constant, inverter rated capacity and grid frequency change rate. When the grid frequency change rate of the target photovoltaic power station is negative, the first output frequency regulation of the target photovoltaic power station is to increase the first output power; when the grid frequency change rate of the target photovoltaic power station is positive, the first output frequency regulation of the target photovoltaic power station is to decrease the first output power.

[0029] In some embodiments, the first output power of the target photovoltaic power station can be calculated using the calculation function: First output power = Inertial time constant * Inverter rated capacity * Grid frequency change rate, where the inertial time constant can be taken as 1s, and the inverter rated capacity is obtained based on the actual configuration parameters of the photovoltaic inverter. Furthermore, the first output frequency regulation of the photovoltaic inverter for increasing the first output power means increasing the input power value so that the increased input power value is consistent with the first output power value; the first output frequency regulation of the photovoltaic inverter for decreasing the first output power means decreasing the input power value so that the decreased input power value is consistent with the first output power value.

[0030] The second output power of the target photovoltaic power station is obtained by comparing the frequency variation deviation generated in the grid parameters with the frequency variation deviation threshold. Specifically: If the grid frequency variation deviation of the target photovoltaic power station is less than or equal to the grid frequency variation deviation threshold, then no second output frequency regulation is required for the target photovoltaic power station; if the grid frequency variation deviation of the target photovoltaic power station is greater than the grid frequency variation deviation threshold, then the second output frequency regulation is required for the target photovoltaic power station. The damping coefficient of the target photovoltaic power station is obtained, and the second output power of the target photovoltaic power station is obtained by multiplying the damping coefficient by the deviation of the grid frequency change. Obtain the rated deviation value of the target photovoltaic power station; if the deviation of the grid frequency change of the target photovoltaic power station is less than the rated deviation value, the second output frequency regulation of the target photovoltaic power station is to increase the second output power; if the deviation of the grid frequency change of the target photovoltaic power station is greater than the rated deviation value, the second output frequency regulation of the target photovoltaic power station is to decrease the second output power.

[0031] In some embodiments, the second output power of the target photovoltaic power station can be calculated using the calculation function: Second Output Power = Damping Coefficient * Grid Frequency Variation Deviation. Furthermore, for the photovoltaic inverter, increasing the second output frequency to increase the second output power means increasing the input power value so that the increased input power value is consistent with the second output power value; for the photovoltaic inverter, decreasing the second output frequency to decrease the second output power means decreasing the input power value so that the decreased input power value is consistent with the second output power value. Additionally, the damping coefficient is generally set to 5-20%S_n / Hz, and the specific value of the damping coefficient can be determined according to the actual grid requirements of the photovoltaic power station.

[0032] Step S5 is as follows: The target photovoltaic power plant includes at least one time scale interval, and the time scale interval also corresponds to an adjustment power category, which corresponds to the power supply strategy. The power adjustment categories include instantaneous power adjustment, continuous power adjustment, and long-term power adjustment. The power adjustment time is compared with the time scale interval to obtain the time comparison result. Based on the time comparison result, the power adjustment power of the power station corresponding to the power adjustment time is classified into adjustment power categories to obtain the adjustment power category corresponding to the power station adjustment power. The power supply strategy corresponding to the power adjustment category is recorded as the target power station frequency regulation strategy for power station power adjustment.

[0033] The power supply strategy corresponding to the adjusted power category is recorded as the target power station frequency regulation strategy for the power station's power adjustment, specifically: If the power adjustment category corresponding to the power adjustment of the power station is instantaneous power adjustment, then the power value corresponding to the power adjustment of the power station is output according to the energy storage unit of the target photovoltaic power station. If the power adjustment category corresponding to the power adjustment of the power station is continuous power adjustment, then the power value corresponding to the power adjustment of the power station is based on the energy storage unit and the photovoltaic inverter output of the target photovoltaic power station. If the power adjustment category corresponding to the power adjustment of the power station is long-term adjustment power, then the power value corresponding to the power adjustment power output of the photovoltaic inverter of the target photovoltaic power station shall be used.

[0034] In some embodiments, the target power plant frequency regulation strategy is actually the power supply method corresponding to the power adjustment power of the power plant. The specific power supply method is determined by the power adjustment type corresponding to the power adjustment power of the power plant. When the power adjustment category corresponding to the power adjustment power of the power plant is instantaneous power adjustment, the power adjustment power of the power plant is supplied only through the energy storage unit. When the power adjustment category corresponding to the power adjustment power of the power plant is continuous power adjustment, the power adjustment power of the power plant is supplied simultaneously through the energy storage unit and the photovoltaic inverter. When the power adjustment category corresponding to the power adjustment power of the power plant is long-term power adjustment, the power adjustment power of the power plant is supplied only through the photovoltaic inverter.

[0035] Step S6 is as follows: Obtain the frequency regulation time corresponding to the power adjustment of the power station, and construct the frequency regulation power trajectory of the target photovoltaic power station based on the frequency regulation time and the power adjustment of the power station; Frequency regulation of the target photovoltaic power station is carried out based on the frequency regulation power trajectory and the frequency regulation strategy of the target power station.

[0036] In some embodiments, the frequency modulation power trajectory is constructed with frequency modulation time as the horizontal axis and power adjustment of the power station as the vertical axis. The frequency modulation power trajectory can be used to obtain the trend of the power station's adjustment frequency changing over time. Frequency modulation of the target photovoltaic power station based on the frequency modulation power trajectory and the target power station's frequency modulation strategy refers to supplying power to the power station's frequency modulation power in the frequency modulation power trajectory within the frequency modulation time through the power supply method of the target power station's frequency modulation strategy, thereby achieving frequency modulation of the photovoltaic power station through power supply.

[0037] The above are merely preferred embodiments of this application. The scope of protection of this application is not limited to the above embodiments. All technical solutions within the scope of this application's concept are within the scope of protection of this application. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of this application should also be considered within the scope of protection of this application.

Claims

1. A frequency regulation method for a photovoltaic power station, characterized in that, include: Step S1: Obtain the power station parameters of the target photovoltaic power station, including the grid parameters of the power grid in the target photovoltaic power station and the photovoltaic parameters of the photovoltaic inverter; Step S2: Based on the photovoltaic parameters, the frequency regulation triggering mechanism of the target photovoltaic power station is obtained; the frequency regulation triggering mechanism and the grid parameters are compared and analyzed to determine and obtain the power station operation mode of the target photovoltaic power station, wherein the power station operation mode includes the maximum power generation mode and the frequency regulation mode; Step S3: If the target photovoltaic power station operates in maximum power generation mode, then the target photovoltaic power station operates according to the maximum output power in the photovoltaic parameters; Step S4: If the target photovoltaic power station operates in frequency regulation mode, the grid parameters are compared and analyzed with the preset grid parameter thresholds to obtain the power station adjustment power of the target photovoltaic power station. Step S5: Set a time scale interval, each time scale interval corresponding to a power supply strategy; obtain the power adjustment time corresponding to the power adjustment of the power station, and analyze the target power station frequency regulation strategy based on the power adjustment time and the time scale interval. Step S6: Based on the power adjustment of the power station and the frequency regulation strategy of the target power station, perform frequency regulation of the target photovoltaic power station.

2. The frequency regulation method for a photovoltaic power station according to claim 1, characterized in that, The power plant parameters include the grid parameters of the power grid in the target photovoltaic power plant and the photovoltaic parameters of the photovoltaic inverter, specifically: The photovoltaic parameters include real-time output power and maximum output power; the grid parameters include grid frequency change rate and grid frequency change deviation.

3. The frequency regulation method for a photovoltaic power station according to claim 2, characterized in that, Based on the analysis of the photovoltaic parameters, the frequency regulation triggering mechanism of the target photovoltaic power station is obtained as follows: Set an output power benchmark range, and each output power benchmark range has a corresponding frequency modulation triggering mechanism; The real-time output power of the target photovoltaic power station is compared with the output power benchmarking range to obtain the output power benchmarking range corresponding to the real-time output power, and the frequency modulation triggering mechanism corresponding to the output power benchmarking range is recorded as the frequency modulation triggering mechanism of the target photovoltaic power station. The frequency regulation triggering mechanism includes the range of the power grid frequency change rate, the range of the power grid frequency change deviation, and the threshold of the change duration period.

4. The frequency regulation method for a photovoltaic power station according to claim 3, characterized in that, By comparing and analyzing the frequency regulation triggering mechanism and grid parameters, the operating mode of the target photovoltaic power station is determined and obtained, specifically: Obtain the duration of the rate of change of the power grid frequency change rate in the power grid parameters; obtain the duration of the deviation of the power grid frequency change in the power grid parameters; If the grid frequency change rate in the grid parameters is within the range of the grid frequency change rate and the duration of the change rate is greater than the change duration period threshold, then the target photovoltaic power station is determined to meet the first frequency regulation triggering condition. If the grid frequency change deviation in the grid parameters is within the range of grid frequency change deviation, and the duration of the change deviation is greater than the change duration period threshold, then the target photovoltaic power station is determined to meet the second frequency regulation triggering condition. If the target photovoltaic power station does not simultaneously meet the first frequency regulation triggering condition and the second frequency regulation triggering condition, then the power station operation mode of the target photovoltaic power station is determined to be the maximum power generation mode; if the target photovoltaic power station simultaneously meets the first frequency regulation triggering condition and the second frequency regulation triggering condition, then the power station operation mode of the target photovoltaic power station is determined to be the frequency regulation mode.

5. A frequency regulation method for a photovoltaic power station according to claim 4, characterized in that, If the target photovoltaic power station operates in frequency regulation mode, the grid parameters are compared and analyzed with preset grid parameter thresholds to obtain the power station adjustment power of the target photovoltaic power station, specifically: The power grid parameter thresholds include the power grid frequency change rate threshold and the power grid frequency change deviation threshold; The first output power of the target photovoltaic power station is obtained by comparing the grid frequency change rate in the grid parameters with the frequency change rate threshold; the second output power of the target photovoltaic power station is obtained by comparing the grid frequency change deviation in the grid parameters with the frequency change deviation threshold. The power adjustment power of the target photovoltaic power station is obtained by integrating the first output power and the second output power.

6. The frequency regulation method for a photovoltaic power station according to claim 5, characterized in that, The first output power of the target photovoltaic power station is obtained by comparing the grid frequency change rate in the grid parameters with the frequency change rate threshold. Specifically: If the grid frequency change rate of the target photovoltaic power station is less than or equal to the grid frequency change rate threshold, then the first output frequency regulation of the target photovoltaic power station is not required; if the grid frequency change rate of the target photovoltaic power station is greater than the frequency change rate threshold, then the first output frequency regulation of the target photovoltaic power station is required. The inertial time constant and inverter rated capacity of the target photovoltaic power station are obtained, and the first output power of the target photovoltaic power station is obtained by multiplying the inertial time constant, inverter rated capacity and grid frequency change rate. When the grid frequency change rate of the target photovoltaic power station is negative, the first output frequency regulation of the target photovoltaic power station is to increase the first output power; when the grid frequency change rate of the target photovoltaic power station is positive, the first output frequency regulation of the target photovoltaic power station is to decrease the first output power.

7. A frequency regulation method for a photovoltaic power station according to claim 6, characterized in that, The second output power of the target photovoltaic power station is obtained by comparing the grid frequency variation deviation with the frequency variation deviation threshold in the grid parameters. Specifically: If the grid frequency variation deviation of the target photovoltaic power station is less than or equal to the grid frequency variation deviation threshold, then no second output frequency regulation is required for the target photovoltaic power station; if the grid frequency variation deviation of the target photovoltaic power station is greater than the grid frequency variation deviation threshold, then the second output frequency regulation is required for the target photovoltaic power station. Obtain the damping coefficient of the target photovoltaic power station, and obtain the second output power of the target photovoltaic power station based on the product of the damping coefficient and the deviation of the grid frequency change; Obtain the rated deviation value of the target photovoltaic power station; if the deviation of the grid frequency change of the target photovoltaic power station is less than the rated deviation value, the second output frequency regulation of the target photovoltaic power station is to increase the second output power; if the deviation of the grid frequency change of the target photovoltaic power station is greater than the rated deviation value, the second output frequency regulation of the target photovoltaic power station is to decrease the second output power.

8. A frequency regulation method for a photovoltaic power station according to claim 7, characterized in that, Step S5 is as follows: The target photovoltaic power plant includes at least one time scale interval, and the time scale interval also corresponds to an adjustment power category, which corresponds to the power supply strategy. The adjustment power categories include instantaneous adjustment power, continuous adjustment power, and long-term adjustment power; The power adjustment time is compared with the time scale interval to obtain the time comparison result. Based on the time comparison result, the power adjustment power of the power station corresponding to the power adjustment time is classified into adjustment power categories to obtain the adjustment power category corresponding to the power station adjustment power. The power supply strategy corresponding to the power adjustment category is recorded as the target power station frequency regulation strategy for power station power adjustment.

9. A frequency regulation method for a photovoltaic power station according to claim 8, characterized in that, The power supply strategy corresponding to the adjusted power category is denoted as the target power station frequency regulation strategy for power station power adjustment, specifically: If the power adjustment category corresponding to the power adjustment power of the power station is instantaneous power adjustment, then the power value corresponding to the power station adjustment power is output according to the energy storage unit of the target photovoltaic power station. If the power adjustment category corresponding to the power adjustment of the power station is continuous power adjustment, then the power value corresponding to the power adjustment of the power station is output according to the energy storage unit and photovoltaic inverter of the target photovoltaic power station. If the power adjustment category corresponding to the power adjustment power of the power station is long-term adjustment power, then the power value corresponding to the power station adjustment power output by the photovoltaic inverter of the target photovoltaic power station shall be based on the power value of the power station adjustment power.

10. A frequency regulation method for a photovoltaic power station according to claim 9, characterized in that, Step S6 is as follows: Obtain the frequency regulation time corresponding to the power adjustment of the power station, and construct the frequency regulation power trajectory of the target photovoltaic power station based on the frequency regulation time and the power adjustment power of the power station; Frequency regulation of the target photovoltaic power station is carried out based on the frequency regulation power trajectory and the target power station frequency regulation strategy.

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