A frequency control method, apparatus, device and storage medium

Abstract

This application discloses a frequency regulation method, apparatus, device, and storage medium, relating to the field of primary frequency regulation control technology for power grids. The method includes: setting a preset number of numerical points to divide the power grid frequency into corresponding frequency intervals based on different numerical points; acquiring the current power grid frequency and determining the frequency interval corresponding to the current power grid frequency to obtain a target frequency interval; selecting a corresponding preset control strategy based on the target frequency interval to obtain a target control strategy; generating a corresponding frequency regulation control command based on the target control strategy and sending the frequency regulation control command to the substation control layer so that the substation control layer executes the frequency regulation control command. This application regulates the power grid frequency by setting multiple levels of frequency dead zones and comprehensively utilizing multiple energy sources such as energy storage, photovoltaic, wind power, and thermal power, thereby improving the grid's ability to connect to new energy sources while enhancing grid stability and power generation economics.

Description

Technical Field

[0001] This invention relates to the field of primary frequency regulation control technology for power grids, and particularly to a frequency regulation method, device, equipment, and storage medium. Background Technology

[0002] Under the "dual-carbon" vision, the grid-connected scale of wind power, photovoltaics, and energy storage will reach new heights. With the rapid development of ultra-high-voltage power transmission and the construction of new energy sources such as wind power and solar energy, the regional power grid structure is becoming increasingly complex, and the technical requirements for the safe and stable operation of the power grid are also becoming increasingly stringent. In order to limit the frequency variation of the power grid and ensure the balance of active power and the stability of the power grid frequency while the grid is developing rapidly, the power grid has put forward the function requirement of primary frequency regulation for generating units.

[0003] Traditional primary frequency regulation control of power grids determines whether frequency fluctuations exceed the grid's specified dead zone value. Once the dead zone value is exceeded, the control systems of the generating units automatically adjust the increase or decrease of their active power to stabilize the grid frequency near its rated frequency. However, this method of adjusting the generating load through a fixed dead zone is relatively coarse and can easily lead to grid frequency fluctuations near the dead zone, causing under- or over-adjustment.

[0004] Furthermore, in my country's major regional power grids, thermal power units are primarily used as the power source for grid frequency regulation, responding to system frequency changes by adjusting the output of these units. However, thermal power units have certain limitations in frequency regulation. For example, thermal power units have long energy conversion times (coal grinding, combustion), have insensitive speed regulation zones, long response time lags, low ramp rates, are unsuitable for short-term frequency regulation, and have low frequency regulation accuracy. Sometimes, they can even cause reverse frequency regulation. Moreover, participating in frequency regulation exacerbates wear and tear on thermal power units, thus shortening their lifespan, increasing fuel consumption, raising operating costs, increasing waste emissions and system thermal reserve capacity, and failing to fully leverage the advantages of renewable energy green power generation. Summary of the Invention

[0005] In view of this, the purpose of this invention is to provide a frequency regulation method, apparatus, device, and storage medium that can more accurately regulate the power grid frequency, fully utilize the advantages of new energy sources, and improve power grid stability and power generation economics. The specific solution is as follows:

[0006] In a first aspect, this application discloses a frequency regulation method applied to a scheduling control layer, comprising:

[0007] A preset number of numerical points are set so that the power grid frequency can be divided into corresponding frequency intervals based on different numerical points;

[0008] Obtain the current power grid frequency and determine the frequency range corresponding to the current power grid frequency to obtain the target frequency range;

[0009] Based on the target frequency range, a corresponding preset control strategy is selected to obtain the target control strategy;

[0010] Based on the target control strategy, a corresponding frequency modulation control command is generated and sent to the station control layer so that the station control layer can execute the frequency modulation control command.

[0011] Optionally, setting a preset number of numerical points to divide the power grid frequency into corresponding frequency intervals based on different numerical points includes:

[0012] Set a preset number of numerical points, and divide the preset number of numerical points into two parts to obtain a first set of numerical points and a second set of numerical points;

[0013] Obtain the total value of adding all the numerical points in the first set of numerical points to the rated frequency to obtain the corresponding high-frequency value; obtain the absolute value of the difference between all the numerical points in the second set of numerical points and the rated frequency to obtain the corresponding low-frequency value.

[0014] The power grid frequency is divided into a corresponding number of frequency intervals based on the high-frequency value and the low-frequency value.

[0015] Optionally, dividing the power grid frequency into a corresponding number of frequency intervals based on the high-frequency value and the low-frequency value includes:

[0016] The power grid frequency is divided into a corresponding number of frequency intervals based on the disturbance value; wherein the disturbance value includes a first disturbance value, a second disturbance value, a third disturbance value, and a fourth disturbance value; the largest value among the high-frequency values ​​is determined as the first disturbance value, the smallest value among the high-frequency values ​​is determined as the second disturbance value, the largest value among the low-frequency values ​​is determined as the third disturbance value, and the smallest value among the low-frequency values ​​is determined as the fourth disturbance value.

[0017] Optionally, dividing the power grid frequency into a corresponding number of frequency intervals based on the disturbance value includes:

[0018] The set of frequency values ​​that are greater than or equal to the first disturbance value is defined as the first frequency range;

[0019] The set of frequency values ​​that are less than the first disturbance value and greater than or equal to the second disturbance value is determined as the second frequency range;

[0020] The set of frequency values ​​that are less than the second disturbance value and greater than or equal to the third disturbance value is determined as the third frequency interval;

[0021] The set of frequency values ​​that are less than the third perturbation value and greater than or equal to the fourth perturbation value is determined as the fourth frequency interval;

[0022] The set of frequency values ​​less than the fourth disturbance value is determined as the fifth frequency range.

[0023] Optionally, obtaining the current power grid frequency and determining the frequency range corresponding to the current power grid frequency to obtain the target frequency range includes:

[0024] The current power grid frequency is obtained, and the current power grid frequency is compared with all disturbance values ​​to obtain the corresponding comparison results;

[0025] Based on the comparison results, the frequency range corresponding to the current power grid frequency is determined to obtain the target frequency range.

[0026] Optionally, before selecting a corresponding preset control strategy based on the target frequency range to obtain the target control strategy, the method further includes:

[0027] Different preset control strategies are formulated based on different frequency ranges; wherein, the preset control strategies include controlling the thermal power units to reduce load and adjust frequency when the current grid frequency is in the first frequency range or the second frequency range, controlling the wind, solar and energy storage units to increase load and adjust frequency when the current grid frequency is in the fourth frequency range or the fifth frequency range, and not performing adjustment operations when the current grid frequency is in the third frequency range.

[0028] Optionally, the step of generating a corresponding frequency modulation control command based on the target control strategy and sending the frequency modulation control command to the station control layer so that the station control layer executes the frequency modulation control command includes:

[0029] Based on the target control strategy, a corresponding frequency regulation control command is generated and sent to the station control layer. The station control layer then sends the decomposed frequency regulation control command to the corresponding generator set to complete the corresponding adjustment operation. At the same time, the operating information of each device is uploaded to the dispatch control layer in real time.

[0030] Secondly, this application discloses a frequency regulation device applied to a scheduling control layer, comprising:

[0031] The interval division module is used to set a preset number of numerical points so as to divide the power grid frequency into corresponding frequency intervals based on different numerical points.

[0032] The target frequency range determination module is used to obtain the current power grid frequency and determine the frequency range corresponding to the current power grid frequency in order to obtain the target frequency range.

[0033] The strategy selection module is used to select a corresponding preset control strategy based on the target frequency range to obtain the target control strategy;

[0034] The instruction generation module is used to generate corresponding frequency modulation control instructions based on the target control strategy;

[0035] The instruction sending module is used to send the frequency modulation control instruction to the station control layer so that the station control layer can execute the frequency modulation control instruction.

[0036] Thirdly, this application discloses an electronic device, including:

[0037] Memory, used to store computer programs;

[0038] A processor is used to execute the computer program to implement the steps of the frequency control method disclosed above.

[0039] Fourthly, this application discloses a computer-readable storage medium for storing a computer program; wherein, when the computer program is executed by a processor, it implements the frequency control method disclosed above.

[0040] As can be seen, this application provides a frequency regulation method, including: setting a preset number of numerical points to divide the power grid frequency into corresponding frequency intervals based on different numerical points; obtaining the current power grid frequency and determining the frequency interval corresponding to the current power grid frequency to obtain a target frequency interval; selecting a corresponding preset control strategy based on the target frequency interval to obtain a target control strategy; generating a corresponding frequency regulation control command based on the target control strategy and sending the frequency regulation control command to the power station control layer so that the power station control layer executes the frequency regulation control command. Therefore, this application, by setting multiple frequency intervals, helps to more accurately and effectively regulate the power grid frequency dynamically, reduces the amplitude of power grid frequency fluctuations, improves the power system's anti-disturbance capability, and enhances the safety and reliability of power grid operation. At the same time, it fully utilizes the significant advantages of new energy sources and battery energy storage, such as rapid response and flexible control, to set different control strategies for different frequency intervals. After determining the current power grid frequency, it selects the control strategy corresponding to the frequency interval in which the current power grid frequency is located, realizing intelligent complementary integrated frequency regulation of multiple energy sources, promoting energy transformation and green development. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0042] Figure 1 This is a flowchart of a frequency control method disclosed in this application;

[0043] Figure 2 This is a specific system architecture diagram disclosed in this application;

[0044] Figure 3 This is a flowchart of a specific frequency control method disclosed in this application;

[0045] Figure 4 This is a schematic diagram of a frequency range division disclosed in this application;

[0046] Figure 5 This is a flowchart of a specific frequency control method disclosed in this application;

[0047] Figure 6 A schematic diagram of the frequency control device provided in this application;

[0048] Figure 7 This application provides a structural diagram of an electronic device. Detailed Implementation

[0049] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0050] This invention discloses a frequency modulation method, see [link to relevant documentation]. Figure 1 As shown, applied to the scheduling control layer, the method includes:

[0051] Step S11: Set a preset number of numerical points so that the power grid frequency can be divided into corresponding frequency ranges based on different numerical points.

[0052] In this embodiment, a preset number of numerical points are set to divide the power grid frequency into corresponding frequency intervals based on different numerical points. It is understood that the number of numerical points determines the level of detail in the frequency interval division; for more precise frequency control, the number of numerical points can be increased. It should be noted that the power grid frequency in the context of dividing the power grid frequency into corresponding frequency intervals based on different numerical points refers to the frequency value. For example, if four numerical points are set, the power grid frequency can be divided into five frequency intervals.

[0053] Step S12: Obtain the current power grid frequency and determine the frequency range corresponding to the current power grid frequency to obtain the target frequency range.

[0054] In this embodiment, after dividing the power grid frequency into corresponding frequency intervals based on different numerical points, the current power grid frequency is obtained, and the frequency interval corresponding to the current power grid frequency is determined to obtain the target frequency interval. It can be understood that after dividing the power grid frequency into corresponding frequency intervals based on different numerical points, a critical value for each frequency interval of the power grid frequency can be obtained. The obtained current power grid frequency is compared with these critical values ​​to determine the frequency interval corresponding to the current power grid frequency, and then the obtained frequency interval is determined as the target frequency interval.

[0055] Step S13: Select the corresponding preset control strategy based on the target frequency range to obtain the target control strategy.

[0056] In this embodiment, after obtaining the target frequency range corresponding to the current grid frequency, a corresponding preset control strategy is selected based on the target frequency range to obtain the target control strategy. It is understood that before selecting the corresponding preset control strategy based on the target frequency range, control strategies corresponding to different frequency ranges are pre-set. It is also understood that the control strategy combines thermal power units with new energy sources, fully utilizing the significant advantages of new energy sources (green and environmentally friendly) and battery energy storage (rapid response, flexible control, bidirectional adjustment) to flexibly adjust and improve the primary frequency regulation effect.

[0057] Step S14: Generate a corresponding frequency modulation control command based on the target control strategy, and send the frequency modulation control command to the station control layer so that the station control layer can execute the frequency modulation control command.

[0058] In this embodiment, after obtaining the target control strategy, a corresponding frequency modulation control command is generated based on the target control strategy, and the frequency modulation control command is sent to the station control layer so that the station control layer executes the frequency modulation control command. It can be understood that, for example... Figure 2As shown, the integrated frequency regulation control system comprises a two-layer architecture: a dispatch control layer and a power station control layer. The dispatch control layer performs operations such as data acquisition, frequency configuration, power generation forecasting, power load forecasting, analysis and decision-making, and coordinated control. It acts as a bridge between the upper-level dispatch center and various power generation systems. By collecting data from subsystems such as thermal power units, wind power units, photovoltaic units, energy storage systems, power prediction systems, and substations, it forecasts the regional power grid's power generation margin and power load. Simultaneously, as the control center of the entire system, it performs intelligent analysis and decision-making, providing frequency regulation control analysis support and generating hierarchical commands to be issued to thermal power units, wind power units, photovoltaic units, and energy storage systems for execution, achieving comprehensive monitoring and integrated frequency regulation control of thermal power, wind power, photovoltaic power, and energy storage. The power station control layer includes control systems for thermal power units, wind power units, photovoltaic units, and energy storage systems. Therefore, after generating corresponding frequency regulation control commands based on the target control strategy, these commands need to be sent to the power station control layer. It should be noted that the station control layer is deployed in each station, uploading the operating information of each device in real time, and simultaneously receiving frequency modulation control commands issued by the dispatch control layer. These frequency modulation control commands are then distributed to the corresponding areas to achieve individual control of each station's system. The corresponding areas include thermal power units, wind power units, photovoltaic inverters, and energy storage control units.

[0059] As can be seen, this application provides a frequency regulation method, including: setting a preset number of numerical points to divide the power grid frequency into corresponding frequency intervals based on different numerical points; obtaining the current power grid frequency and determining the frequency interval corresponding to the current power grid frequency to obtain a target frequency interval; selecting a corresponding preset control strategy based on the target frequency interval to obtain a target control strategy; generating a corresponding frequency regulation control command based on the target control strategy and sending the frequency regulation control command to the power station control layer so that the power station control layer executes the frequency regulation control command. Therefore, this application, by setting multiple frequency intervals, helps to more accurately and effectively regulate the power grid frequency dynamically, reduces the amplitude of power grid frequency fluctuations, improves the power system's anti-disturbance capability, and enhances the safety and reliability of power grid operation. At the same time, it fully utilizes the significant advantages of new energy sources and battery energy storage, such as rapid response and flexible control, to set different control strategies for different frequency intervals. After determining the current power grid frequency, it selects the control strategy corresponding to the frequency interval in which the current power grid frequency is located, realizing intelligent complementary integrated frequency regulation of multiple energy sources, promoting energy transformation and green development.

[0060] See Figure 3 As shown, this embodiment of the invention discloses a frequency control method. Compared with the previous embodiment, this embodiment further explains and optimizes the technical solution.

[0061] Step S21: Set a preset number of numerical points and divide the preset number of numerical points into two parts to obtain a first set of numerical points and a second set of numerical points.

[0062] In this embodiment, a preset number of numerical points are set, and these preset number of numerical points are divided into two equal parts to obtain a first set of numerical points and a second set of numerical points. It is understood that after setting the preset number of numerical points, when the number of numerical points is even, the numerical points are directly divided equally or customized into two parts according to actual conditions to obtain the first set of numerical points and the second set of numerical points. It should be noted that dividing the numerical points into two parts ensures that a certain number of numerical points exist in both frequency ranges above and below the rated grid frequency. When the number of numerical points is odd, the numerical points are customized according to actual conditions to obtain the first set of numerical points and the second set of numerical points. For example, when four numerical points fs1, fs2, fs3, and fs4 are set, these four numerical points are divided equally to obtain the first set of numerical points and the second set of numerical points, that is, each of the first and second sets of numerical points contains two numerical points; the first set of numerical points contains fs3 and fs4, and the second set of numerical points contains fs1 and fs2. It should be noted that the numerical points mentioned are all deviation values, not power grid frequency values.

[0063] Step S22: Obtain the total value of adding all the numerical points in the first set of numerical points to the rated frequency to obtain the corresponding high-frequency value; obtain the absolute value of the difference between all the numerical points in the second set of numerical points and the rated frequency to obtain the corresponding low-frequency value.

[0064] In this embodiment, after obtaining the first set of numerical points and the second set of numerical points, the total value of adding all the numerical points in the first set to the rated frequency is obtained to obtain the corresponding high-frequency value. Similarly, the absolute value of the difference between all the numerical points in the second set and the rated frequency is obtained to obtain the corresponding low-frequency value. It is understood that since the numerical points are all deviation values, it is necessary to use these deviation values ​​and the rated frequency to perform corresponding calculations to obtain the final frequency value. For example, in the first set of numerical points, fs3 has a value of 0.02 and fs4 has a value of 0.04. In the second set of numerical points, fs1 has a value of 0.05 and fs2 has a value of 0.03. Adding all the numerical points in the first set to the rated frequency, the value obtained by adding fs3 to the rated frequency is 50.02, and the value obtained by adding fs4 to the rated frequency is 50.04. Since the frequency value obtained by adding all the numerical points in the first set to the rated frequency is greater than the rated frequency value, this frequency value is determined as the high-frequency value. The absolute values ​​of the differences between all the numerical points in the second set of numerical points and the rated frequency are obtained. The absolute value of the difference between fs1 and the rated frequency is 49.95, and the absolute value of the difference between fs2 and the rated frequency is 49.97. Since the absolute values ​​of the differences between all the numerical points in the second set of numerical points and the rated frequency are less than the rated frequency, the obtained frequency value is determined as the low frequency value.

[0065] Step S23: Divide the power grid frequency into a corresponding number of frequency intervals based on the high-frequency value and the low-frequency value.

[0066] In this embodiment, after obtaining the corresponding high-frequency and low-frequency values, the power grid frequency is divided into a corresponding number of frequency intervals based on the high-frequency and low-frequency values. It can be understood that the power grid frequency is divided into a corresponding number of frequency intervals based on disturbance values; wherein, the disturbance values ​​include a first disturbance value, a second disturbance value, a third disturbance value, and a fourth disturbance value. It should be noted that the high-frequency and low-frequency values ​​are respectively determined as different disturbance values. The largest value among the high-frequency values ​​is determined as the first disturbance value, the smallest value among the high-frequency values ​​is determined as the second disturbance value, the largest value among the low-frequency values ​​is determined as the third disturbance value, and the smallest value among the low-frequency values ​​is determined as the fourth disturbance value. For example, 50.04 is determined as the first disturbance value, 50.02 as the second disturbance value, 49.97 as the third disturbance value, and 49.95 as the fourth disturbance value.

[0067] like Figure 4Specifically, the set of frequency values ​​greater than or equal to the first disturbance value is determined as the first frequency interval; the set of frequency values ​​less than the first disturbance value and greater than or equal to the second disturbance value is determined as the second frequency interval; the set of frequency values ​​less than the second disturbance value and greater than or equal to the third disturbance value is determined as the third frequency interval; the set of frequency values ​​less than the third disturbance value and greater than or equal to the fourth disturbance value is determined as the fourth frequency interval; and the set of frequency values ​​less than the fourth disturbance value is determined as the fifth frequency interval. For example, the frequency range greater than or equal to 50.04 is determined as the first frequency interval; the frequency range less than 50.04 and greater than or equal to 50.02 is determined as the second frequency interval; the frequency range less than 50.02 and greater than or equal to 49.97 is determined as the third frequency interval; the frequency range less than 49.97 and greater than or equal to 49.95 is determined as the fourth frequency interval; and the frequency range less than 49.95 is determined as the fifth frequency interval.

[0068] Step S24: Obtain the current power grid frequency and determine the frequency range corresponding to the current power grid frequency to obtain the target frequency range.

[0069] Step S25: Select the corresponding preset control strategy based on the target frequency range to obtain the target control strategy.

[0070] Step S26: Generate a corresponding frequency modulation control command based on the target control strategy, and send the frequency modulation control command to the station control layer so that the station control layer can execute the frequency modulation control command.

[0071] For details regarding steps S24 to S26, please refer to the corresponding content disclosed in the foregoing embodiments, which will not be repeated here.

[0072] As can be seen, this application's embodiment divides the numerical points into a first set and a second set. Then, it performs corresponding calculations with the rated frequency using the numerical points in each set to obtain the calculated frequency value. Based on the calculated frequency value, it divides the corresponding frequency interval to determine the frequency interval corresponding to the current grid frequency, thus obtaining the target frequency interval. Finally, based on the target frequency interval, it selects the corresponding preset control strategy and generates the corresponding frequency regulation control command. This application, by setting multi-level frequency intervals, helps to more accurately and effectively regulate the grid frequency dynamically, reducing the amplitude of grid frequency fluctuations and improving the stability, safety, and reliability of grid operation. It achieves integrated frequency regulation of multiple energy sources with intelligent complementarity, promoting energy transformation and green development, and improving the economic efficiency of grid power generation.

[0073] See Figure 5As shown, this embodiment of the invention discloses a frequency control method. Compared with the previous embodiment, this embodiment further explains and optimizes the technical solution.

[0074] Step S31: Set a preset number of numerical points so that the power grid frequency can be divided into corresponding frequency ranges based on different numerical points.

[0075] Step S32: Obtain the current power grid frequency and compare the current power grid frequency with all disturbance values ​​to obtain the corresponding comparison results.

[0076] In this embodiment, after dividing the power grid frequency into corresponding frequency intervals based on different numerical points, the current power grid frequency is obtained, and then compared with all disturbance values ​​to obtain corresponding comparison results. It can be understood that by comparing the current power grid frequency with all disturbance values, a final comparison result is obtained when the comparison results of the current power grid frequency with two adjacent disturbance values ​​are different. For example, if the current power grid frequency is compared with the first disturbance value, and if the current power grid frequency is less than the first disturbance value, then the current power grid frequency is further compared with the second disturbance value. If the current power grid frequency is greater than or equal to the second disturbance value, then the final comparison result is that the current power grid frequency is greater than or equal to the second disturbance value and less than the first disturbance value.

[0077] Step S33: Based on the comparison result, determine the frequency range corresponding to the current power grid frequency to obtain the target frequency range.

[0078] In this embodiment, the frequency range corresponding to the current power grid frequency is determined based on the comparison result to obtain the target frequency range. It is understood that the comparison process involves comparing the current power grid frequency with different disturbance values, resulting in different comparison results. Therefore, when the comparison results of the current power grid frequency with two adjacent disturbance values ​​are different, a final comparison result is obtained, and then the target frequency range corresponding to the current power grid frequency is determined based on the final comparison result.

[0079] Step S34: Formulate different preset control strategies based on different frequency ranges.

[0080] In this embodiment, different preset control strategies are formulated based on different frequency ranges. It can be understood that the preset control strategies include: when the current grid frequency is in the first or second frequency range, prioritizing load reduction and frequency regulation of thermal power units; when the current grid frequency is in the fourth or fifth frequency range, prioritizing load increase and frequency regulation of wind, solar, and energy storage units; and not performing any adjustment operation when the current grid frequency is in the third frequency range.

[0081] For example, when the current grid frequency is within the first frequency range (i.e., the current grid frequency is greater than or equal to the first disturbance value (50+fs4), the current frequency state is determined to be a high-frequency, large-disturbance situation. In this case, priority is given to controlling the load reduction of thermal power units to decrease their power output, thereby lowering the grid frequency. Due to the large frequency fluctuations, a joint frequency regulation control strategy involving wind turbines and photovoltaic inverters is selected to reduce the output power of both to maintain a balance between power generation and load demand, thus lowering the grid frequency. When the current grid frequency is within the second frequency range (i.e., the current grid frequency is less than the first disturbance value (50+fs4) and greater than or equal to the second disturbance value (50+fs3), the current frequency state is determined to be a high-frequency, small-disturbance situation. In this case, priority is given to controlling the load reduction of thermal power units to decrease their power output, thereby lowering the grid frequency. Simultaneously, a joint energy storage control unit is used to achieve the charging process, quickly smoothing out grid frequency fluctuations. It is understandable that prioritizing the reduction of thermal power unit load can effectively reduce coal consumption and promote energy conservation and emission reduction across society. When the current grid frequency is in the third frequency range, i.e., the current grid frequency is less than the second disturbance value (50+fs3) and greater than or equal to the third disturbance value (50-fs2), the grid frequency fluctuates within a small range around the rated frequency of 50Hz, and is basically stable near the rated value of 50Hz, in a relatively stable state of slight fluctuation. Therefore, in order to reduce the operation of the generator unit, the generator unit does not have a regulating effect on the slight fluctuations in the grid frequency. When the current grid frequency is in the fourth frequency range, i.e., the current grid frequency is less than the third disturbance value (50-fs2) and greater than or equal to the fourth disturbance value (50-fs1), the current frequency state is determined to be a low-frequency small disturbance. At this time, the energy storage control unit is preferentially used to discharge to achieve rapid regulation. In the case of system underfrequency, energy is released into the grid to suppress grid frequency disturbances. A control strategy of joint frequency regulation of wind turbines and photovoltaic inverters is adopted to increase the output power of wind turbines and photovoltaic inverters to maintain the balance between power generation and load demand. When the current grid frequency is within the fifth frequency range, i.e., when the current grid frequency is less than the fourth disturbance value (50-fs1), the current frequency state is determined to be a low-frequency, large-disturbance situation. In this case, a control strategy of joint frequency regulation by wind turbines and photovoltaic inverters is prioritized. This increases the load of new energy power generation, maintains a balance between power generation and load demand for frequency control, and simultaneously utilizes a joint energy storage control unit to achieve the discharge process. This effectively compensates for the intermittent and fluctuating nature of wind turbine and photovoltaic inverter power generation, quickly smooths grid frequency fluctuations, and improves environmental benefits while ensuring power quality and system stability by fully utilizing new energy resources. It is understandable that at high frequencies, prioritizing the reduction of thermal power unit load can effectively reduce coal consumption and promote energy conservation and emission reduction across society; at low frequencies, fully utilizing new energy resources improves environmental benefits while ensuring power quality and system stability.

[0082] Step S35: Select the corresponding preset control strategy based on the target frequency range to obtain the target control strategy.

[0083] Step S36: Generate a corresponding frequency modulation control command based on the target control strategy, and send the frequency modulation control command to the station control layer so that the station control layer can execute the frequency modulation control command.

[0084] In this embodiment, a corresponding frequency regulation control command is generated based on the target control strategy, and the frequency regulation control command is sent to the station control layer so that the station control layer can execute the frequency regulation control command. It can be understood that generating the corresponding frequency regulation control command based on the target control strategy and sending the frequency regulation control command to the station control layer allows the station control layer to send the decomposed frequency regulation control command to the corresponding generator set to complete the corresponding adjustment operation, and simultaneously upload the operating information of each device to the dispatch control layer in real time.

[0085] For details regarding steps S31 and S35, please refer to the corresponding content disclosed in the foregoing embodiments, which will not be repeated here.

[0086] As can be seen, this application embodiment sets a preset number of numerical points, divides the power grid frequency into corresponding frequency intervals based on different numerical points, obtains the current power grid frequency, and compares the current power grid frequency with all disturbance values ​​to obtain corresponding comparison results. Based on the comparison results, it determines the frequency interval corresponding to the current power grid frequency to obtain the target frequency interval. Then, it formulates different preset control strategies based on different frequency intervals, generates corresponding frequency regulation control commands based on the target control strategies, and sends the frequency regulation control commands to the station control layer so that the station control layer can execute the frequency regulation control commands. By reducing the power generation load of thermal power units, it improves the grid's access to new energy sources while also improving grid stability and power generation economy, reducing the amplitude of grid frequency fluctuations, improving the safety and reliability of grid operation, realizing integrated frequency regulation of multiple energy sources with intelligent complementarity, and promoting energy transformation and green development.

[0087] See Figure 6 As shown in the embodiments, this application also discloses a frequency regulation device applied to the scheduling control layer, comprising:

[0088] The interval division module 11 is used to set a preset number of numerical points so as to divide the power grid frequency into corresponding frequency intervals based on different numerical points;

[0089] The target frequency range determination module 12 is used to obtain the current power grid frequency and determine the frequency range corresponding to the current power grid frequency in order to obtain the target frequency range.

[0090] The strategy selection module 13 is used to select a corresponding preset control strategy based on the target frequency range to obtain the target control strategy;

[0091] Instruction generation module 14 is used to generate corresponding frequency modulation control instructions based on the target control strategy;

[0092] The instruction sending module 15 is used to send the frequency modulation control instruction to the station control layer so that the station control layer can execute the frequency modulation control instruction.

[0093] As can be seen, this application includes: setting a preset number of numerical points to divide the power grid frequency into corresponding frequency intervals based on different numerical points; obtaining the current power grid frequency and determining the frequency interval corresponding to the current power grid frequency to obtain a target frequency interval; selecting a corresponding preset control strategy based on the target frequency interval to obtain a target control strategy; generating a corresponding frequency regulation control command based on the target control strategy and sending the frequency regulation control command to the substation control layer so that the substation control layer executes the frequency regulation control command. Therefore, this application, by setting multiple frequency intervals, helps to more accurately and effectively adjust the power grid frequency dynamically, reduces the amplitude of power grid frequency fluctuations, improves the power system's anti-disturbance capability, and enhances the safety and reliability of power grid operation. At the same time, it fully utilizes the significant advantages of new energy sources and battery energy storage, such as rapid response and flexible control, to set different control strategies for different frequency intervals. After determining the current power grid frequency, it selects the control strategy corresponding to the frequency interval in which the current power grid frequency is located, realizing intelligent complementary integrated frequency regulation of multiple energy sources, promoting energy transformation and green development.

[0094] In some specific embodiments, the interval division module 11 specifically includes:

[0095] The numerical point setting unit is used to set a preset number of numerical points;

[0096] A numerical point set partitioning unit is used to divide a preset number of numerical points into two parts to obtain a first numerical point set and a second numerical point set.

[0097] A high-frequency value acquisition unit is used to acquire the total value of adding all the value points of the first set of value points to the rated frequency, so as to obtain the corresponding high-frequency value.

[0098] The low-frequency value acquisition unit is used to acquire the absolute value of the difference between all the value points of the second set of value points and the rated frequency, so as to obtain the corresponding low-frequency value.

[0099] A frequency interval division unit is used to divide the power grid frequency into a corresponding number of frequency intervals based on the high-frequency value and the low-frequency value.

[0100] In some specific embodiments, the interval division module 11 specifically includes:

[0101] The disturbance value determination unit is used to determine the largest value among the high-frequency values ​​as the first disturbance value, the smallest value among the high-frequency values ​​as the second disturbance value, the largest value among the low-frequency values ​​as the third disturbance value, and the smallest value among the low-frequency values ​​as the fourth disturbance value.

[0102] The first frequency interval determination unit is used to determine the set of frequency values ​​that are greater than or equal to the first disturbance value as the first frequency interval.

[0103] The second frequency range determination unit is used to determine the set of frequency values ​​that are less than the first disturbance value and greater than or equal to the second disturbance value as the second frequency range;

[0104] The third frequency range determination unit is used to determine the set of frequency values ​​that are less than the second disturbance value and greater than or equal to the third disturbance value as the third frequency range;

[0105] The fourth frequency range determination unit is used to determine the set of frequency values ​​that are less than the third disturbance value and greater than or equal to the fourth disturbance value as the fourth frequency range;

[0106] The fifth frequency range determination unit is used to determine the set of frequency values ​​that are less than the fourth disturbance value as the fifth frequency range.

[0107] In some specific embodiments, the target interval determination module 12 specifically includes:

[0108] A frequency comparison unit is used to acquire the current power grid frequency and compare the current power grid frequency with all disturbance values ​​to obtain the corresponding comparison results;

[0109] The target frequency range determination unit is used to determine the frequency range corresponding to the current power grid frequency based on the comparison result, so as to obtain the target frequency range.

[0110] Furthermore, embodiments of this application also provide an electronic device. Figure 7 This is a structural diagram of an electronic device 20 according to an exemplary embodiment. The content of the diagram should not be construed as limiting the scope of this application.

[0111] Figure 7This is a schematic diagram of the structure of an electronic device 20 provided in an embodiment of this application. Specifically, the electronic device 20 may include: at least one processor 21, at least one memory 22, a power supply 23, a communication interface 24, an input / output interface 25, and a communication bus 26. The memory 22 stores a computer program, which is loaded and executed by the processor 21 to implement the relevant steps in the frequency control method disclosed in any of the foregoing embodiments. Furthermore, the electronic device 20 in this embodiment may specifically be an electronic computer.

[0112] In this embodiment, the power supply 23 is used to provide operating voltage for each hardware device on the electronic device 20; the communication interface 24 can create a data transmission channel between the electronic device 20 and external devices, and the communication protocol it follows can be any communication protocol applicable to the technical solution of this application, and is not specifically limited here; the input / output interface 25 is used to acquire external input data or output data to the outside world, and its specific interface type can be selected according to specific application needs, and is not specifically limited here.

[0113] In addition, the memory 22, as a carrier for resource storage, can be a read-only memory, random access memory, disk or optical disk, etc. The resources stored thereon can include operating system 221, computer program 222, etc., and the storage method can be temporary storage or permanent storage.

[0114] The operating system 221 is used to manage and control the various hardware devices on the electronic device 20 and the computer program 222, which may be Windows Server, Netware, Unix, Linux, etc. In addition to including a computer program capable of performing the frequency modulation method executed by the electronic device 20 as disclosed in any of the foregoing embodiments, the computer program 222 may further include a computer program capable of performing other specific tasks.

[0115] Furthermore, this application also discloses a storage medium storing a computer program, which, when loaded and executed by a processor, implements the frequency control method steps disclosed in any of the foregoing embodiments.

[0116] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section.

[0117] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0118] The frequency regulation method, apparatus, device, and storage medium provided by the present invention have been described in detail above. Specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A frequency modulation method, characterized in that, Applied to the scheduling and control layer, including: A preset number of numerical points are set so that the power grid frequency can be divided into corresponding frequency intervals based on different numerical points; Obtain the current power grid frequency and determine the frequency range corresponding to the current power grid frequency to obtain the target frequency range; Based on the target frequency range, a corresponding preset control strategy is selected to obtain the target control strategy; Based on the target control strategy, a corresponding frequency modulation control command is generated and sent to the station control layer so that the station control layer can execute the frequency modulation control command. The setting of a preset number of numerical points, so as to divide the power grid frequency into corresponding frequency intervals based on different numerical points, includes: Set a preset number of numerical points, and divide the preset number of numerical points into two parts to obtain a first set of numerical points and a second set of numerical points; Obtain the total value of adding all the numerical points in the first set of numerical points to the rated frequency to obtain the corresponding high-frequency value; obtain the absolute value of the difference between all the numerical points in the second set of numerical points and the rated frequency to obtain the corresponding low-frequency value. Based on the high-frequency value and the low-frequency value, the power grid frequency is divided into a corresponding number of frequency intervals; The process of dividing the power grid frequency into a corresponding number of frequency intervals based on the high-frequency value and the low-frequency value includes: The power grid frequency is divided into a corresponding number of frequency intervals based on the disturbance value; wherein the disturbance value includes a first disturbance value, a second disturbance value, a third disturbance value, and a fourth disturbance value; the largest value among the high-frequency values ​​is determined as the first disturbance value, the smallest value among the high-frequency values ​​is determined as the second disturbance value, the largest value among the low-frequency values ​​is determined as the third disturbance value, and the smallest value among the low-frequency values ​​is determined as the fourth disturbance value; The process of dividing the power grid frequency into a corresponding number of frequency intervals based on the disturbance value includes: The set of frequency values ​​that are greater than or equal to the first disturbance value is defined as the first frequency range; The set of frequency values ​​that are less than the first disturbance value and greater than or equal to the second disturbance value is determined as the second frequency range; The set of frequency values ​​that are less than the second disturbance value and greater than or equal to the third disturbance value is determined as the third frequency interval; The set of frequency values ​​that are less than the third perturbation value and greater than or equal to the fourth perturbation value is determined as the fourth frequency interval; The set of frequency values ​​smaller than the fourth disturbance value is defined as the fifth frequency range; The preset control strategies corresponding to different frequency ranges include: When the current grid frequency is in the first frequency range, the thermal power units are controlled to reduce their load to decrease their power output, and the output power of the wind turbines and photovoltaic inverters is reduced. When the current grid frequency is in the second frequency range, the thermal power units are controlled to reduce their load to decrease their power output, and the charging process is achieved in conjunction with the energy storage control unit. When the current grid frequency is in the third frequency range, no adjustment operation is performed. When the current grid frequency is in the fourth frequency range, the energy storage control unit discharges and increases the output power of the wind turbines and photovoltaic inverters. When the current grid frequency is in the fifth frequency range, the power generation load of new energy sources, namely the wind turbines and photovoltaic inverters, is increased, and the discharge process is achieved in conjunction with the energy storage control unit.

2. The frequency control method according to claim 1, characterized in that, The step of obtaining the current power grid frequency and determining the frequency range corresponding to the current power grid frequency to obtain the target frequency range includes: The current power grid frequency is obtained, and the current power grid frequency is compared with all disturbance values ​​to obtain the corresponding comparison results; Based on the comparison results, the frequency range corresponding to the current power grid frequency is determined to obtain the target frequency range.

3. The frequency control method according to claim 1, characterized in that, Before selecting a corresponding preset control strategy based on the target frequency range to obtain the target control strategy, the method further includes: Different preset control strategies are formulated based on different frequency ranges; wherein, the preset control strategies include controlling the thermal power units to reduce load and adjust frequency when the current grid frequency is in the first frequency range or the second frequency range, controlling the wind, solar and energy storage units to increase load and adjust frequency when the current grid frequency is in the fourth frequency range or the fifth frequency range, and not performing adjustment operations when the current grid frequency is in the third frequency range.

4. The frequency control method according to any one of claims 1 to 3, characterized in that, The step of generating a corresponding frequency modulation control command based on the target control strategy and sending the frequency modulation control command to the station control layer so that the station control layer executes the frequency modulation control command includes: Based on the target control strategy, a corresponding frequency regulation control command is generated and sent to the station control layer. The station control layer then sends the decomposed frequency regulation control command to the corresponding generator set to complete the corresponding adjustment operation. At the same time, the operating information of each device is uploaded to the dispatch control layer in real time.

5. A frequency control device, characterized in that, Applied to the scheduling and control layer, including: The interval division module is used to set a preset number of numerical points so as to divide the power grid frequency into corresponding frequency intervals based on different numerical points. The target frequency range determination module is used to obtain the current power grid frequency and determine the frequency range corresponding to the current power grid frequency in order to obtain the target frequency range. The strategy selection module is used to select a corresponding preset control strategy based on the target frequency range to obtain the target control strategy; The instruction generation module is used to generate corresponding frequency modulation control instructions based on the target control strategy; The instruction sending module is used to send the frequency modulation control instruction to the station control layer so that the station control layer can execute the frequency modulation control instruction; The interval division module specifically includes: The numerical point setting unit is used to set a preset number of numerical points; A numerical point set partitioning unit is used to divide a preset number of numerical points into two parts to obtain a first numerical point set and a second numerical point set. A high-frequency value acquisition unit is used to acquire the total value of adding all the value points of the first set of value points to the rated frequency, so as to obtain the corresponding high-frequency value. The low-frequency value acquisition unit is used to acquire the absolute value of the difference between all the value points of the second set of value points and the rated frequency, so as to obtain the corresponding low-frequency value. A frequency interval division unit is used to divide the power grid frequency into a corresponding number of frequency intervals based on the high-frequency value and the low-frequency value, and specifically to divide the power grid frequency into a corresponding number of frequency intervals based on a disturbance value; wherein the disturbance value includes a first disturbance value, a second disturbance value, a third disturbance value, and a fourth disturbance value; The disturbance value determination unit is used to determine the largest value among the high-frequency values ​​as the first disturbance value, the smallest value among the high-frequency values ​​as the second disturbance value, the largest value among the low-frequency values ​​as the third disturbance value, and the smallest value among the low-frequency values ​​as the fourth disturbance value. The first frequency interval determination unit is used to determine the set of frequency values ​​that are greater than or equal to the first disturbance value as the first frequency interval. The second frequency range determination unit is used to determine the set of frequency values ​​that are less than the first disturbance value and greater than or equal to the second disturbance value as the second frequency range; The third frequency range determination unit is used to determine the set of frequency values ​​that are less than the second disturbance value and greater than or equal to the third disturbance value as the third frequency range; The fourth frequency range determination unit is used to determine the set of frequency values ​​that are less than the third disturbance value and greater than or equal to the fourth disturbance value as the fourth frequency range; The fifth frequency interval determination unit is used to determine the set of frequency values ​​that are less than the fourth disturbance value as the fifth frequency interval; The preset control strategies corresponding to different frequency ranges include: When the current grid frequency is in the first frequency range, the thermal power units are controlled to reduce their load to decrease their power output, and the output power of the wind turbines and photovoltaic inverters is reduced. When the current grid frequency is in the second frequency range, the thermal power units are controlled to reduce their load to decrease their power output, and the charging process is achieved in conjunction with the energy storage control unit. When the current grid frequency is in the third frequency range, no adjustment operation is performed. When the current grid frequency is in the fourth frequency range, the energy storage control unit discharges and increases the output power of the wind turbines and photovoltaic inverters. When the current grid frequency is in the fifth frequency range, the power generation load of new energy sources, namely the wind turbines and photovoltaic inverters, is increased, and the discharge process is achieved in conjunction with the energy storage control unit.

6. An electronic device, characterized in that, include: Memory, used to store computer programs; A processor for executing the computer program to implement the steps of the frequency control method as described in any one of claims 1 to 4.

7. A computer-readable storage medium, characterized in that, Used to store a computer program; wherein, when the computer program is executed by a processor, it implements the frequency control method as described in any one of claims 1 to 4.

Images