Frequency control method and device for hybrid energy storage power system containing sodium ion battery

Abstract

The invention discloses a frequency control method and equipment for a hybrid energy storage power system containing a sodium ion battery, the method is applied to a hybrid energy storage system, the hybrid energy storage system comprises a thermal power generating unit, a net-forming fan, the sodium ion battery, a water electrolysis hydrogen production device and a hydrogen fuel cell, and the method comprises the following steps: acquiring the frequency of a power grid, the power grid frequency is power grid real-time frequency; when the frequency of the power grid is smaller than the rated frequency of the power grid, controlling the thermal power generating unit, the net-forming fan, the sodium-ion battery and the hydrogen fuel battery to participate in frequency modulation and transmitting electric energy to the power grid to improve the frequency of the power grid; and when the power grid frequency is greater than the power grid rated frequency, controlling the thermal power generating unit, the sodium-ion battery and the water electrolysis hydrogen production device to participate in frequency modulation, and consuming electric energy from the power grid to reduce the power grid frequency. The frequency regulation control of the novel power system can be realized, the service life of the energy storage battery can be prolonged, and the safe and stable operation of the system can be better guaranteed.

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 batteries for hybrid energy storage. Background Art

[0002] At present, the transformation of energy structure is gradually advancing, and new power systems with a high proportion of new energy are developing rapidly. However, new energy is highly random and volatile, and is generally connected to the grid through power electronic devices, which brings huge challenges to the frequency stability of new power systems. Battery energy storage technology has a fast response speed and high power in a short time, but its service life will decay with the increase of the number of cycles. Hydrogen energy storage technology has a high energy density and a long energy release time. Therefore, the complementary participation of the two in the frequency regulation of the new power system can effectively enhance the active support capability of new energy for the safety and stability of the grid frequency.

[0003] At the same time, the current frequency control methods for new energy units and energy storage are all grid-following control methods, which are synchronized with the grid frequency through a phase-locked loop, which will lead to an inherent delay of 100ms in frequency measurement, command generation and other links, which greatly affects the frequency regulation effect. The grid-forming control has the ability to actively form a grid in voltage and frequency. When the system power disturbance occurs, the output power changes first, which can provide inertia support without delay. Therefore, it is necessary to introduce hydrogen energy storage technology and propose a new power system frequency control strategy for grid-forming control. Summary of the invention

[0004] The present invention aims to solve the technical problems in the related art at least to a certain extent. To this end, the first object of the present invention is to provide a method for controlling the frequency of a power system containing sodium-ion battery hybrid energy storage, which can realize the frequency regulation control of a new power system, and can improve the service life of the energy storage battery, and can better 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, wherein the hybrid energy storage system comprises a thermal power unit, a grid-type fan, a sodium ion battery, a water electrolysis hydrogen production device and a hydrogen fuel cell, and the method comprises:

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

[0009] When the grid frequency is lower than the grid rated frequency, the thermal power generation unit, the grid-forming wind turbine, the sodium ion battery and the hydrogen fuel cell are controlled 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 modulation; otherwise, each device in the hybrid energy storage system is controlled not to participate in frequency modulation.

[0014] Preferably, the grid frequency deviation is decomposed into a high-frequency component and a low-frequency component by 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.

[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 the frequency modulation are respectively expressed as follows:

[0016]

[0017] Among them, 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 fan, 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 grid-type wind turbines, sodium ion batteries, hydrogen fuel cells, and water electrolysis hydrogen production devices, respectively; s is a complex variable in Laplace transform; Δf is the grid frequency deviation; They respectively represent the maximum frequency modulation power of the grid-type wind turbine, sodium ion battery, hydrogen fuel cell, and water electrolysis hydrogen production device.

[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 H represents the equivalent inertia time constant of the grid-type fan; 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 the hydrogen state coefficient; K FC.max Indicates the maximum frequency modulation coefficient of hydrogen fuel cells; 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 high expected value of 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 respectively represent the state of charge, minimum state of charge and maximum state of charge of the sodium ion battery; 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 purpose, the second aspect of the present invention provides an electronic device, including 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-building control method adopted by the present invention can effectively solve the inherent delay problems existing in the frequency measurement, command generation and other links of the grid-following control method, so as to 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 complementing the advantages of hybrid energy storage and participating 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 engineering, 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 given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0039] Figure 2 This is a flow chart of a method for controlling frequency of an electric power system containing 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, and 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 be used to explain the present invention, and should not be construed as limiting the present invention.

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

[0044] The power system frequency control method containing sodium ion battery hybrid energy storage of this embodiment 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 Flow chart 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, where the grid frequency is the real-time grid frequency.

[0046] Step S102: When the grid frequency is less than the rated grid frequency, the thermal power units, grid-forming 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 active grid-forming capability of voltage and frequency. When a grid power disturbance occurs, the electromagnetic power of the grid-forming device changes first, and then causes the grid frequency to change, which can provide delay-free inertia support and can be regarded as a voltage source. The grid-forming 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-following control, so that the grid has stronger frequency support capabilities in high new energy penetration scenarios. The control framework of the grid-forming control and the grid-following control is as follows: Figure 3 shown.

[0049] During the frequency modulation 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 so, the hybrid energy storage system including the hydrogen fuel cell is controlled to participate in the frequency modulation 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 modulation to reduce the power grid frequency, thereby realizing 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 modulation. 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 modulation. The specific grid-type control framework based on hybrid energy storage participating in wind power frequency modulation is as follows: Figure 4 shown.

[0051] It should be noted that the grid frequency deviation is decomposed into high-frequency and low-frequency components by a low-pass filter. Based on the rapid response characteristics of sodium-ion batteries, it can be used to smooth high-frequency components; based on the characteristics of the hydrogen energy storage system, which has a large energy storage capacity but a slow response speed, it can be used to smooth low-frequency components. The hydrogen energy storage system includes a water electrolysis hydrogen production device and a hydrogen fuel cell. Among them, intelligent algorithms such as fuzzy control algorithms can be used to control and adjust the filter coefficients in real time, and the intelligent algorithms are not limited in this embodiment.

[0052] In the process of power system frequency regulation, the frequency regulation power of grid-type wind turbines, sodium ion batteries, hydrogen fuel cells and water electrolysis hydrogen production devices participating in frequency regulation grid-type control are expressed as follows:

[0053]

[0054] Among them, 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 fan, 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 grid-type wind turbines, sodium ion batteries, hydrogen fuel cells, and water electrolysis hydrogen production devices, respectively; s is a 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] In the formula, H W H represents the equivalent inertia time constant of the grid-type fan; 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. 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 the frequency modulation, and the hydrogen fuel cell does not work. H =H EL , H EL is the equivalent inertia time constant of the water electrolysis hydrogen production device.

[0059] It can be understood that the hydrogen produced by the water electrolysis hydrogen production device is stored in a high-pressure hydrogen storage tank after pressurization, and 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 power grid frequency deviation can be obtained by formula (5), and then compared to see whether it crosses the dead zone, so as to dynamically control which devices participate in frequency modulation in real time.

[0060] In one embodiment of the present invention, the working state of the water electrolysis hydrogen production device and the hydrogen fuel cell, that is, the frequency modulation coefficient can be adjusted according to the hydrogen state coefficient, thereby increasing the service life of the equipment and ensuring the safe and stable operation of the equipment. In this embodiment, the hydrogen state coefficient is the ratio of the remaining hydrogen reserves in the high-pressure hydrogen storage tank to the rated hydrogen reserves, and 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 storage capacity of hydrogen. Among them, 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 a hydrogen fuel cell.

[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 the hydrogen state coefficient; K FC.max Indicates the maximum frequency modulation coefficient of hydrogen fuel cells; SOH low Indicates that the hydrogen state coefficient is lower than expected.

[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 high expected value of hydrogen state coefficient; SOH max Indicates the maximum value of the hydrogen state coefficient.

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

[0078] Furthermore, in order to avoid over-charging and over-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, b represent the first to third constant values ​​of the Logistic smoothing function, and their values ​​are 0.01, 13, and 0.3 respectively.

[0081] Therefore, the frequency modulation coefficients of the sodium ion battery, the water electrolysis hydrogen production device and the hydrogen fuel cell can be adjusted in real time according to the charge state of the sodium ion battery, the hydrogen state coefficient of the water electrolysis hydrogen production device and 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 article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0084] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the present invention. After reading the above content, it will be apparent to those skilled in the art that various modifications and substitutions of the present invention will occur. Therefore, the protection scope of the present invention should be limited 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 fan, a sodium ion battery, a water electrolysis hydrogen production device and a hydrogen fuel cell, and the method includes: Obtaining a power grid frequency, where the power grid frequency is a real-time power grid frequency; When the grid frequency is lower than the grid rated frequency, the thermal power generation unit, the grid-forming wind turbine, the sodium ion battery and the hydrogen fuel cell are controlled 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, 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.

2. The method for controlling the frequency of a power system containing sodium-ion battery hybrid energy storage according to claim 1, characterized in that: 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 modulation; otherwise, each device in the hybrid energy storage system is controlled not to participate in frequency modulation.

3. The method for controlling the frequency of a power system containing sodium-ion battery hybrid energy storage as claimed in claim 2, characterized in that: 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, wherein 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, characterized in that: The frequency modulation powers of the grid-type wind turbine, sodium ion battery, hydrogen fuel cell and water electrolysis hydrogen production device when participating in frequency modulation are expressed as follows: Among them, 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 fan, 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 grid-type wind turbines, sodium ion batteries, hydrogen fuel cells, and water electrolysis hydrogen production devices, respectively; s is a complex variable in Laplace transform; Δf is the grid frequency deviation; They respectively represent the maximum frequency modulation power of the grid-type wind turbine, sodium ion battery, hydrogen fuel cell, and water electrolysis hydrogen production device.

5. The method for controlling the frequency of a power system containing sodium-ion battery hybrid energy storage as claimed in claim 4, characterized in that: 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 H represents the equivalent inertia time constant of the grid-type fan; 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.

6. The method for controlling the frequency of a power system containing sodium-ion battery hybrid energy storage as claimed in claim 4, characterized in that: The frequency modulation coefficient of the hydrogen fuel cell and the water electrolysis hydrogen production device is adjusted according to the hydrogen state coefficient.

7. The method for controlling the frequency of a power system containing sodium-ion battery hybrid energy storage as claimed in claim 6, characterized in that: The hydrogen state coefficient is the ratio of the remaining hydrogen reserves in the high-pressure hydrogen storage tank to the rated hydrogen reserves.

8. The method for controlling the frequency of a power system containing sodium-ion battery hybrid energy storage as claimed in claim 6, characterized in that: 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 the hydrogen state coefficient; K FC.max Indicates the maximum frequency modulation coefficient of hydrogen fuel cells; 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 high expected value of hydrogen state coefficient; SOH max Indicates the maximum value of the hydrogen state coefficient.

9. The method for controlling the frequency of a power system containing sodium-ion battery hybrid energy storage as claimed in claim 4, characterized in that: The frequency modulation coefficient of the sodium ion battery is dynamically adjusted in real time through 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 respectively represent the state of charge, minimum state of charge and maximum state of charge of the sodium ion battery; e represents a natural constant; a, r, and b represent the first to third constant values ​​of the Logistic smoothing function, respectively.

10. 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 as described in any one of claims 1 to 9 is implemented.

Images