Power system frequency control method and device containing sodium ion battery hybrid energy storage

Abstract

The present invention discloses a method and device for controlling the frequency of an electric power system containing sodium-ion battery hybrid energy storage. The method is applied to a hybrid energy storage system comprising a thermal power unit, a grid-type wind turbine, a sodium-ion battery, a water electrolysis hydrogen production device, and a hydrogen fuel cell. The method comprises: obtaining the grid frequency, which is the real-time grid frequency; when the grid frequency is less than the rated grid frequency, controlling the thermal power unit, the grid-type wind turbine, the sodium-ion battery, and the hydrogen fuel cell to participate in frequency modulation and transmit electricity to the grid to increase the grid frequency; when the grid frequency is greater than the rated grid frequency, controlling the thermal power unit, the sodium-ion battery, and the water electrolysis hydrogen production device to participate in frequency modulation and consume electricity from the grid to reduce the grid frequency. The present invention can realize frequency regulation and control of a new type of power system, and can also increase the service life of the energy storage battery, thereby ensuring the safe and stable operation of the system.

Description

Technical Field

[0001] The present invention relates to the technical field of sodium ion energy storage batteries, and in particular to a method and device for controlling the frequency of an electric power system containing sodium ion battery hybrid energy storage. Background Art

[0002] Currently, energy structure transformation is gradually progressing, and new power systems with a high proportion of renewable energy are rapidly developing. However, renewable energy is characterized by high randomness and volatility, and is generally connected to the grid through power electronics, posing significant challenges to frequency stability in these new power systems. Battery energy storage technology offers fast response times and high power output in short bursts, but its service life decreases with increasing cycles. Hydrogen energy storage technology, on the other hand, has high energy density and a long energy release time. Therefore, the complementary participation of these two technologies in frequency regulation in new power systems can effectively enhance the ability of renewable energy to proactively support the security and stability of grid frequency.

[0003] At the same time, current frequency regulation control methods for renewable energy units and energy storage are all grid-following control methods, which achieve synchronization with the grid frequency through a phase-locked loop. This results in an inherent delay of 100ms in frequency measurement, command generation, and other frequency regulation steps, greatly affecting the frequency regulation effect. Grid-forming control, on the other hand, has the ability to actively form a grid in voltage and frequency. When system power disturbances occur, output power changes first, providing delay-free inertia support. Therefore, it is necessary to introduce hydrogen energy storage technology and propose a new power system frequency control strategy based on grid-forming control. Summary of the Invention

[0004] The present invention aims to, at least to some extent, address the technical problems encountered in the related art. To this end, a first object of the present invention is to provide a method for frequency control of a power system using hybrid energy storage using sodium-ion batteries. This method can achieve frequency regulation and control of a novel power system, extend the service life of the energy storage batteries, and further ensure the safe and stable operation of the system.

[0005] A second object of the present invention is to provide an electronic device.

[0006] To achieve the above object, the present invention is implemented through the following technical solutions:

[0007] A method for controlling the frequency of a power system containing sodium-ion battery hybrid energy storage is applied to a hybrid energy storage system comprising a thermal power unit, a grid-type wind turbine, a sodium-ion battery, a water electrolysis hydrogen production device, and a hydrogen fuel cell. The method comprises:

[0008] Obtaining a grid frequency, where the grid frequency is a real-time grid frequency;

[0009] When the grid frequency is lower than the rated grid frequency, controlling the thermal power generation units, grid-type wind turbines, sodium ion batteries and hydrogen fuel cells to participate in frequency modulation and transmit electric energy to the grid to increase the grid frequency;

[0010] When the grid frequency is greater than the rated grid frequency, the thermal power generation unit, the sodium ion battery and the water electrolysis hydrogen production device are controlled to participate in frequency modulation and consume electric energy from the grid to reduce the grid frequency.

[0011] Preferably, the method further comprises:

[0012] Obtaining a grid frequency deviation, and determining whether the grid frequency deviation exceeds a dead zone;

[0013] When the grid frequency deviation exceeds the dead zone, each device in the hybrid energy storage system is controlled to participate in frequency regulation; otherwise, each device in the hybrid energy storage system is controlled not to participate in frequency regulation.

[0014] Preferably, the grid frequency deviation is decomposed into high-frequency components and low-frequency components through a low-pass filter; wherein the high-frequency components are smoothed by a sodium-ion battery, and the low-frequency components are smoothed by a hydrogen energy storage system, and the hydrogen energy storage system includes the water electrolysis hydrogen production device and a hydrogen fuel cell.

[0015] Preferably, the frequency modulation powers of the grid-type fan, the sodium ion battery, the hydrogen fuel cell and the water electrolysis hydrogen production device when participating in frequency modulation are respectively expressed as follows:

[0016]

[0017] Where ΔP W,i , ΔP B,i , ΔP FC,i , ΔP EL,i They represent the frequency modulation power of the grid-type fan, sodium ion battery, hydrogen fuel cell, and water electrolysis hydrogen production device respectively; min is the minimum value function; K W,i , K B,i , K FC,i , K EL,i They represent the frequency modulation coefficients of the grid-type wind turbine, sodium ion battery, hydrogen fuel cell, and water electrolysis hydrogen production device respectively; T W,i 、T B,i 、T FC,i 、T EL,i They represent the frequency modulation inertia time constants of the grid-type wind turbine, sodium ion battery, hydrogen fuel cell, and water electrolysis hydrogen production device, respectively; s is the complex variable in Laplace transform; Δf is the grid frequency deviation; They represent the maximum frequency modulation power of the grid-type wind turbine, sodium ion battery, hydrogen fuel cell, and water electrolysis hydrogen production device respectively.

[0018] Preferably, there is an equality constraint between the grid frequency deviation and the grid disturbance power, and the equality constraint is expressed as follows:

[0019]

[0020] Among them, H W Represents the equivalent inertia time constant of the grid-type fan; H B represents the equivalent inertia time constant of sodium ion battery; H H represents the equivalent inertia time constant of the hydrogen energy storage system; D represents the equivalent damping coefficient; ΔP represents the grid disturbance power.

[0021] Preferably, the frequency modulation coefficients of the hydrogen fuel cell and the water electrolysis hydrogen production device are adjusted according to the hydrogen state coefficient.

[0022] Preferably, the hydrogen state coefficient is the ratio of the remaining hydrogen reserves in the high-pressure hydrogen storage tank to the rated hydrogen reserves.

[0023] Preferably, the relationship between the frequency modulation coefficient and the hydrogen state coefficient of the hydrogen fuel cell is expressed as follows:

[0024]

[0025] Wherein, SOH represents the hydrogen state coefficient; SOH min Indicates the minimum value of hydrogen state coefficient; K FC.max Indicates the maximum frequency modulation coefficient of the hydrogen fuel cell; SOH low Indicates a low expected value for the hydrogen state coefficient;

[0026] The relationship between the frequency modulation coefficient and the hydrogen state coefficient of the water electrolysis hydrogen production device is expressed as follows:

[0027]

[0028] Among them, K EL.max Indicates the maximum frequency modulation coefficient of the water electrolysis hydrogen production device, SOH high Indicates a high expected value of the hydrogen state coefficient; SOH max Indicates the maximum value of the hydrogen state coefficient.

[0029] Preferably, the frequency modulation coefficient of the sodium ion battery is dynamically adjusted in real time by a Logistic smoothing function, and the Logistic smoothing function is expressed as follows:

[0030]

[0031] Among them, K B.max Indicates the maximum frequency modulation coefficient of the sodium ion battery; SOC, SOC min , SOC maxThey represent the state of charge, minimum state of charge, and maximum state of charge of the sodium ion battery respectively; e represents a natural constant; a, r, and b represent the first to third constant values ​​of the logistic smoothing function respectively.

[0032] To achieve the above-mentioned objectives, the second aspect of the present invention provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the above-mentioned method for controlling the frequency of a power system containing sodium-ion battery hybrid energy storage is implemented.

[0033] The present invention has at least the following technical effects:

[0034] (1) The grid-forming control method adopted by the present invention can effectively solve the inherent delay problem existing in the frequency measurement, instruction generation and other links of the grid-following control method, and provide the power grid with stronger frequency support capabilities in the scenario of high new energy penetration.

[0035] (2) The present invention adopts a hybrid energy storage and frequency modulation method of sodium ion batteries and hydrogen energy storage, which can effectively solve the limitations of a single energy storage form in terms of energy storage capacity, response speed and other characteristics. By taking advantage of the complementary advantages of hybrid energy storage to participate in the frequency modulation of the new power system, it can effectively enhance the active support capability of new energy for the safe and stable frequency of the power grid. At the same time, the variable frequency modulation coefficient control method can ensure that the state of energy storage is always within the safe and stable threshold, which can not only increase the service life of the energy storage battery, but also ensure the safe and stable operation of the system.

[0036] (3) The liquid hydrogen and hydrogen produced by the water electrolysis hydrogen production device of the present invention can also be used in many fields such as chemical industry, aerospace, and hydrogen fuel cells / gas turbines, thereby promoting energy transformation and the economic development of upstream and downstream industries of hydrogen energy.

[0037] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 Schematic diagram of the hybrid energy storage system structure of an embodiment of the present invention.

[0039] Figure 2 This is a flow chart of a method for controlling the frequency of a power system using sodium-ion battery hybrid energy storage according to an embodiment of the present invention.

[0040] Figure 3 Schematic diagram of the control framework for network-building control and network-following control.

[0041] Figure 4 Schematic diagram of the grid-type control framework of hybrid energy storage participating in wind power frequency regulation according to an embodiment of the present invention. DETAILED DESCRIPTION

[0042] The present embodiment is described in detail below. Examples of the embodiment are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, but are not to be construed as limiting the present invention.

[0043] The following describes the power system frequency control method and device containing sodium-ion battery hybrid energy storage of this embodiment with reference to the accompanying drawings.

[0044] The power system frequency control method of the present embodiment containing sodium ion battery hybrid energy storage is applied to a hybrid energy storage system. Figure 1 As shown, the hybrid energy storage system includes a thermal power unit, a grid-type wind turbine, a sodium ion battery, a water electrolysis hydrogen production device, a hydrogen fuel cell and a high-pressure hydrogen storage tank. Figure 2 Flowchart of the method for controlling the frequency of a power system containing sodium-ion battery hybrid energy storage according to an embodiment of the present invention. Figure 2 As shown, the method includes:

[0045] Step S101: Acquire the grid frequency, which is the real-time grid frequency.

[0046] Step S102: When the grid frequency is lower than the rated grid frequency, the thermal power generation units, grid-type wind turbines, sodium ion batteries and hydrogen fuel cells are controlled to participate in frequency modulation and transmit electric energy to the grid to increase the grid frequency.

[0047] Step S103: When the grid frequency is greater than the rated grid frequency, the thermal power generation unit, the sodium ion battery and the water electrolysis hydrogen production device are controlled to participate in frequency modulation and consume electric energy from the grid to reduce the grid frequency.

[0048] The grid-type wind turbine, sodium ion battery, water electrolysis hydrogen production device, and hydrogen fuel cell in this embodiment all adopt a grid-type control method. The grid-type control method has the ability to actively grid-type the voltage and frequency. When a grid power disturbance occurs, the electromagnetic power of the grid-type device changes first, and then causes the grid frequency to change, which can provide inertia support without delay and can be regarded as a voltage source. The grid-type control simulates the motion equation of the synchronous machine rotor in the control algorithm. In theory, the dynamic characteristics are almost the same as those of the synchronous machine, without the inherent delay link of the grid-type control, so that the grid has a stronger frequency support capability in the scenario of high new energy penetration. The control framework of the grid-type control and the grid-type control is as follows. Figure 3 shown.

[0049] During the frequency regulation process of the power system, the real-time frequency of the power grid can be obtained first, and then it can be determined whether the real-time frequency of the power grid is less than the rated frequency of the power grid. If it is less than, the hybrid energy storage system including the hydrogen fuel cell is controlled to participate in the frequency regulation to increase the power grid frequency. Otherwise, the hybrid energy storage system including the water electrolysis hydrogen production device is controlled to participate in the frequency regulation to reduce the power grid frequency, thereby realizing the power grid frequency regulation.

[0050] Among them, when the grid frequency deviation exceeds the dead zone, the thermal power units, grid-type wind turbines, sodium ion batteries, water electrolysis hydrogen production devices, and hydrogen fuel cells are controlled to participate in frequency regulation. When the grid frequency deviation does not exceed the dead zone, the thermal power units, grid-type wind turbines, sodium ion batteries, water electrolysis hydrogen production devices, and hydrogen fuel cells are controlled not to participate in frequency regulation. The specific grid-type control framework based on hybrid energy storage participating in wind power frequency regulation is as follows: Figure 4 shown.

[0051] It should be noted that grid frequency deviation is decomposed into high-frequency and low-frequency components through a low-pass filter. The rapid response of sodium-ion batteries can be used to smooth out the high-frequency component; the large storage capacity but slow response of hydrogen energy storage systems, which include a water electrolysis hydrogen production device and a hydrogen fuel cell, can be used to smooth out the low-frequency component. Intelligent algorithms, such as fuzzy control algorithms, can be used for real-time control and adjustment of the filter coefficients; these intelligent algorithms are not limited in this embodiment.

[0052] During the frequency regulation process of the power system, the frequency regulation power of the grid-type wind turbine, sodium ion battery, hydrogen fuel cell and water electrolysis hydrogen production device participating in the frequency regulation grid-type control is expressed as follows:

[0053]

[0054] Where ΔP W,i , ΔP B,i , ΔP FC,i , ΔP EL,i They represent the frequency modulation power of the grid-type wind turbine, sodium ion battery, hydrogen fuel cell, and water electrolysis hydrogen production device respectively; min is the minimum value function; K W,i , K B,i , K FC,i , K EL,i They represent the frequency modulation coefficients of the grid-type wind turbine, sodium ion battery, hydrogen fuel cell, and water electrolysis hydrogen production device respectively; T W,i 、T B,i 、T FC,i 、T EL,i They represent the frequency modulation inertia time constants of the grid-type wind turbine, sodium ion battery, hydrogen fuel cell, and water electrolysis hydrogen production device, respectively; s is the complex variable in Laplace transform; Δf is the grid frequency deviation; They respectively represent the frequency regulation standby power, i.e. the maximum frequency regulation power, of the grid-type wind turbine, sodium ion battery, hydrogen fuel cell, and water electrolysis hydrogen production device.

[0055] In this embodiment, there is an equality constraint between the grid frequency deviation and the grid disturbance power, and the equality constraint is expressed as follows:

[0056]

[0057] Where H W Represents the equivalent inertia time constant of the grid-type fan; H B represents the equivalent inertia time constant of sodium ion battery; H H represents the equivalent inertia time constant of the hydrogen energy storage system; D represents the equivalent damping coefficient; ΔP represents the grid disturbance power.

[0058] Among them, when the grid frequency decreases, the hydrogen fuel cell participates in frequency modulation, and the water electrolysis hydrogen production device does not work. At this time, H H =H FC , H FC is the equivalent inertia time constant of the hydrogen fuel cell. When the grid frequency increases, the water electrolysis hydrogen production device participates in frequency modulation, and the hydrogen fuel cell does not operate. At this time, H H =H EL , H EL is the equivalent inertia time constant of the water electrolysis hydrogen production device.

[0059] It is understood that the hydrogen produced by the water electrolysis hydrogen production device is pressurized and stored in a high-pressure hydrogen storage tank. The hydrogen fuel cell device generates electricity by burning the hydrogen stored in the high-pressure hydrogen storage tank and returns it to the power grid. In this embodiment, the grid frequency deviation can be obtained using Equation (5), and then compared to see whether it has crossed the dead zone, thereby dynamically controlling which devices participate in frequency modulation in real time.

[0060] In one embodiment of the present invention, the operating state of the water electrolysis hydrogen production device and the hydrogen fuel cell, i.e., the frequency modulation coefficient, can be adjusted according to the hydrogen state coefficient, thereby increasing the service life of the equipment and ensuring safe and stable operation of the equipment. In this embodiment, the hydrogen state coefficient is the ratio of the remaining hydrogen reserve in the high-pressure hydrogen storage tank to the rated hydrogen reserve. The hydrogen state coefficient is expressed as follows:

[0061]

[0062] Where SOH is the hydrogen state coefficient, m H is the remaining hydrogen reserve in the high-pressure hydrogen storage tank, is the rated hydrogen storage capacity. The remaining hydrogen storage capacity in the compressed hydrogen storage tank is expressed as follows:

[0063] m H =m H.unit +∫mEL -∫m FC (7)

[0064] Among them, m H.unit is the initial hydrogen storage capacity in the high-pressure hydrogen storage tank, m EL is the amount of hydrogen produced by the water electrolysis hydrogen production device, m FC The amount of hydrogen consumed by hydrogen fuel cells.

[0065] The amount of hydrogen produced by the water electrolysis hydrogen production device is expressed as follows:

[0066]

[0067] Among them, η EL is the working efficiency of the water electrolysis hydrogen production device, Δt is the discretization time interval, and HHV is the higher heating value of hydrogen.

[0068] The amount of hydrogen consumed by a hydrogen fuel cell is expressed as follows:

[0069]

[0070] Among them, η FC The efficiency of hydrogen fuel cells.

[0071] In this embodiment, the relationship between the frequency modulation coefficient and the hydrogen state coefficient of the hydrogen fuel cell is expressed as follows:

[0072]

[0073] Wherein, SOH represents the hydrogen state coefficient; SOH min Indicates the minimum value of hydrogen state coefficient; K FC.max Indicates the maximum frequency modulation coefficient of the hydrogen fuel cell; SOH low Indicates that the hydrogen state coefficient has a low expected value.

[0074] The relationship between the frequency modulation coefficient and the hydrogen state coefficient of the water electrolysis hydrogen production device is expressed as follows:

[0075]

[0076] Among them, K EL.max Indicates the maximum frequency modulation coefficient of the water electrolysis hydrogen production device, SOH high Indicates a high expected value of the hydrogen state coefficient; SOH max Indicates the maximum value of the hydrogen state coefficient.

[0077] In this embodiment, the frequency modulation coefficients of the hydrogen fuel cell and the water electrolysis hydrogen production device can be adjusted using the above formula.

[0078] Furthermore, in order to avoid overcharging and discharging of sodium-ion batteries and to increase the service life of sodium-ion batteries, the frequency modulation coefficient of sodium-ion batteries can be dynamically adjusted in real time using a Logistic smoothing function. The Logistic smoothing function is expressed as follows:

[0079]

[0080] Among them, K B.max Indicates the maximum frequency modulation coefficient of the sodium ion battery; SOC, SOC min , SOC max They represent the state of charge, minimum state of charge, and maximum state of charge of the sodium ion battery respectively; e represents a natural constant; a, r, and b represent the first to third constant values ​​of the logistic smoothing function, which are 0.01, 13, and 0.3 respectively.

[0081] Therefore, the frequency modulation coefficients of the respective devices can be adjusted in real time according to the state of charge of the sodium ion battery, the hydrogen production device by electrolysis of water, and the hydrogen state coefficient of the hydrogen fuel cell, thereby increasing the service life of each energy storage device and ensuring the safe and stable operation of the power system.

[0082] Furthermore, the present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the above-mentioned method for controlling the frequency of a power system containing sodium-ion battery hybrid energy storage can be implemented.

[0083] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0084] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description is not intended to limit the present invention. After reading the above description, various modifications and substitutions of the present invention will become apparent to those skilled in the art. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A method for controlling the frequency of a power system containing sodium-ion battery hybrid energy storage, characterized in that: Applied to a hybrid energy storage system, the hybrid energy storage system includes a thermal power unit, a grid-type wind turbine, a sodium ion battery, a water electrolysis hydrogen production device and a hydrogen fuel cell, the method includes: Obtaining a grid frequency, where the grid frequency is a real-time grid frequency; When the grid frequency is lower than the rated grid frequency, controlling the thermal power generation units, grid-type wind turbines, sodium ion batteries and hydrogen fuel cells to participate in frequency modulation and transmit electric energy to the grid to increase the grid frequency; When the grid frequency is greater than the rated grid frequency, controlling the thermal power generation unit, the sodium ion battery and the water electrolysis hydrogen production device to participate in frequency modulation and consume electric energy from the grid to reduce the grid frequency; The frequency modulation power of the grid-type wind turbine, sodium ion battery, hydrogen fuel cell and water electrolysis hydrogen production device when participating in frequency modulation is expressed as follows: Where ΔP W,i , ΔP B,i , ΔP FC,i , ΔP EL,i They represent the frequency modulation power of the grid-type fan, sodium ion battery, hydrogen fuel cell, and water electrolysis hydrogen production device respectively; min is the minimum value function; K W,i , K B,i , K FC,i , K EL,i They represent the frequency modulation coefficients of the grid-type wind turbine, sodium ion battery, hydrogen fuel cell, and water electrolysis hydrogen production device respectively; T W,i 、T B,i 、T FC,i 、T EL,i They represent the frequency modulation inertia time constants of the grid-type wind turbine, sodium ion battery, hydrogen fuel cell, and water electrolysis hydrogen production device, respectively; s is the complex variable in Laplace transform; Δf is the grid frequency deviation; They represent the maximum frequency modulation power of the grid-type wind turbine, sodium ion battery, hydrogen fuel cell, and water electrolysis hydrogen production device respectively; There is an equality constraint between the grid frequency deviation and the grid disturbance power, and the equality constraint is expressed as follows: Among them, H W Represents the equivalent inertia time constant of the grid-type fan; H B represents the equivalent inertia time constant of sodium ion battery; H H represents the equivalent inertia time constant of the hydrogen energy storage system; D represents the equivalent damping coefficient; ΔP represents the grid disturbance power.

2. The method for controlling the frequency of a power system containing sodium-ion battery hybrid energy storage according to claim 1, wherein: The method further comprises: Obtaining a grid frequency deviation, and determining whether the grid frequency deviation exceeds a dead zone; When the grid frequency deviation exceeds the dead zone, each device in the hybrid energy storage system is controlled to participate in frequency regulation; otherwise, each device in the hybrid energy storage system is controlled not to participate in frequency regulation.

3. The method for controlling the frequency of a power system containing sodium-ion battery hybrid energy storage according to claim 2, wherein: The grid frequency deviation is decomposed into a high-frequency component and a low-frequency component through a low-pass filter; wherein the high-frequency component is smoothed by a sodium-ion battery, and the low-frequency component is smoothed by a hydrogen energy storage system, and the hydrogen energy storage system includes the water electrolysis hydrogen production device and a hydrogen fuel cell.

4. The method for controlling the frequency of a power system containing sodium-ion battery hybrid energy storage according to claim 1, wherein: The frequency modulation coefficients of the hydrogen fuel cell and the water electrolysis hydrogen production device are adjusted according to the hydrogen state coefficient.

5. The method for controlling the frequency of a power system containing sodium-ion battery hybrid energy storage according to claim 4, wherein: The hydrogen state coefficient is the ratio of the remaining hydrogen reserves in the high-pressure hydrogen storage tank to the rated hydrogen reserves.

6. The method for controlling the frequency of a power system containing sodium-ion battery hybrid energy storage according to claim 4, wherein: The relationship between the frequency modulation coefficient and the hydrogen state coefficient of a hydrogen fuel cell is expressed as follows: Wherein, SOH represents the hydrogen state coefficient; SOH min Indicates the minimum value of hydrogen state coefficient; K FC.max Indicates the maximum frequency modulation coefficient of the hydrogen fuel cell; SOH low Indicates a low expected value for the hydrogen state coefficient; The relationship between the frequency modulation coefficient and the hydrogen state coefficient of the water electrolysis hydrogen production device is expressed as follows: Among them, K EL.max Indicates the maximum frequency modulation coefficient of the water electrolysis hydrogen production device, SOH high Indicates a high expected value of the hydrogen state coefficient; SOH max Indicates the maximum value of the hydrogen state coefficient.

7. The method for controlling the frequency of a power system containing sodium-ion battery hybrid energy storage according to claim 1, wherein: The frequency modulation coefficient of the sodium ion battery is dynamically adjusted in real time by the Logistic smoothing function, which is expressed as follows: Among them, K B.max Indicates the maximum frequency modulation coefficient of the sodium ion battery; SOC, SOC min , SOC max They represent the state of charge, minimum state of charge, and maximum state of charge of the sodium ion battery respectively; e represents a natural constant; a, r, and b represent the first to third constant values ​​of the logistic smoothing function respectively.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the method for controlling the frequency of a power system containing sodium-ion battery hybrid energy storage according to any one of claims 1 to 7 is implemented.

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