Evaluation method and device for green ionization network hydrogen production system

Abstract

The invention relates to an evaluation method and device for a green ionization network hydrogen production system, and the method comprises the steps: obtaining the power supply power of power generation equipment at the t-th time step, the charge state of energy storage equipment at the (t-1)-th time step, and the equipment parameters of the green ionization network hydrogen production system; the electrolysis power of the electrolytic bath and the electric power of the energy storage equipment under the t-th time step length are determined; according to the electric power of the energy storage equipment under the t-th time step and the charge state of the energy storage equipment under the (t-1)-th time step, the charge state of the energy storage equipment under the t-th time step is determined, and according to the electrolysis power of the electrolytic bath under the t-th time step, the hydrogen yield under the t-th time step is determined; and determining the total hydrogen yield according to the sum result of the hydrogen yields of the T time steps in the preset time range. In this way, the hydrogen yield of each time step can be accurately calculated, and making of a reasonable production plan is facilitated.

Description

Technical Field

[0001] The present disclosure relates to the field of renewable energy power generation, and in particular to an evaluation method and device for a green electricity off-grid hydrogen production system. Background Art

[0002] Using green electricity to produce hydrogen (such as wind power to produce hydrogen) to solve the problem of new energy consumption in the power system will promote the transformation of energy-consuming terminals such as transportation and industry and high-energy-consuming and high-emission industries to green and low-carbon. Therefore, large-scale new energy integrated hydrogen production is expected to become the mainstream of hydrogen energy supply, and building a hydrogen energy system with green hydrogen as the main body is an important direction for the development of the power and energy industry.

[0003] However, an important factor restricting the rapid advancement of the current green hydrogen project is grid access. On the one hand, the high-voltage access of wind, solar and hydrogen integration (for example, high-voltage access above 220kV) may impact the safety and stability of the power grid, and the pre-approval process is complicated; on the other hand, various fees of the power grid, such as capacity fees and network access fees, cause the cost of the green hydrogen production process to increase significantly. If green electricity can be used to produce hydrogen off the grid without drawing electricity from the grid, it will not only enable green electricity to be consumed locally without being drawn from the grid, but it may also reduce capacity fee expenditures and drive a significant drop in the cost of electricity for hydrogen production. Green electricity off-grid hydrogen production is generally considered to be an effective way to improve the cost competitiveness of green hydrogen. In order to better analyze the feasibility and economy of green hydrogen projects, it is necessary to improve the accuracy of the output assessment of green electricity off-grid hydrogen production systems. Summary of the invention

[0004] In view of this, the present disclosure proposes an evaluation method and device for a green electricity off-grid hydrogen production system.

[0005] According to one aspect of the present disclosure, an evaluation method is provided, the method being used to evaluate the total hydrogen production of a green electricity off-grid hydrogen production system within a preset time range, the green electricity off-grid hydrogen production system comprising a power generation device, an electrolyzer and an energy storage device, the preset time range comprising T time steps, T being an integer greater than 1, the method comprising: determining the total hydrogen production of the electrolyzer at the t-th time step according to the power supply power of the power generation device at the t-th time step, the charge state of the energy storage device at the t-1th time step, and the device parameters of the green electricity off-grid hydrogen production system; The electrolysis power of the electrolytic cell and the electric power of the energy storage device, wherein the electric power includes charging power and discharging power, and t is any integer from 1 to T; according to the electric power of the energy storage device at the t-th time step and the charge state of the energy storage device at the t-1th time step, the charge state of the energy storage device at the t-th time step is determined, and according to the electrolysis power of the electrolytic cell at the t-th time step, the hydrogen production at the t-th time step is determined; the total hydrogen production is determined according to the sum of the hydrogen production of T time steps within a preset time range.

[0006] In one possible implementation, the device parameters include the minimum state of charge and the maximum discharge power of the energy storage device, and the electrolysis power range of the electrolyzer. According to the power supply power of the power generation device at the t-th time step, the state of charge of the energy storage device at the t-1th time step, and the device parameters of the green electricity off-grid hydrogen production system, the electrolysis power of the electrolyzer and the electric power of the energy storage device at the t-th time step are determined, including: when the power supply power is within the electrolysis power range of the electrolyzer, judging whether the state of charge of the energy storage device at the t-1th time step is greater than the minimum state of charge, and obtaining a first judgment result; when the first judgment result indicates that the energy storage device at the t-1th time step is In the case where the state of charge is greater than the minimum state of charge, it is determined whether the sum of the power supply power of the power generation equipment and the maximum discharge power of the energy storage equipment at the t-th time step is greater than or equal to the upper limit of the electrolysis power of the electrolyzer, and a second judgment result is obtained; in the case where the second judgment result indicates that the sum of the power supply power of the power generation equipment and the maximum discharge power of the energy storage equipment at the t-th time step is greater than or equal to the upper limit of the electrolysis power of the electrolyzer, the upper limit of the electrolysis power of the electrolyzer is determined as the electrolysis power of the electrolyzer at the t-th time step, and the difference between the upper limit of the electrolysis power of the electrolyzer and the power supply power of the power generation equipment at the t-th time step is determined as the discharge power of the energy storage equipment at the t-th time step.

[0007] In a possible implementation, the method further includes: when the first judgment result indicates that the state of charge of the energy storage device at the t-1th time step is less than or equal to the minimum state of charge, the power supply power of the power generation device at the tth time step is determined as the electrolysis power of the electrolyzer at the tth time step, and zero is determined as the discharge power of the energy storage device at the tth time step; when the second judgment result indicates that the sum of the power supply power of the power generation device at the tth time step and the maximum discharge power of the energy storage device is less than the upper limit of the electrolysis power of the electrolyzer, the sum of the power supply power of the power generation device at the tth time step and the maximum discharge power of the energy storage device is determined as the electrolysis power of the electrolyzer at the tth time step, and the maximum discharge power of the energy storage device is determined as the discharge power of the energy storage device at the tth time step.

[0008] In a possible implementation, the device parameters include the maximum state of charge and the maximum charging power of the energy storage device, and the electrolysis power range of the electrolyzer. According to the power supply power of the power generation equipment at the t-th time step, the state of charge of the energy storage device at the t-1th time step, and the equipment parameters of the green electricity off-grid hydrogen production system, the electrolysis power of the electrolyzer and the electric power of the energy storage device at the t-th time step are determined, including: when the power supply power is greater than the upper limit of the electrolysis power of the electrolyzer, the upper limit of the electrolysis power of the electrolyzer is determined as the electrolysis power of the electrolyzer at the t-th time step; judging the storage device at the t-1th time step. The third judgment result is obtained by determining whether the state of charge of the energy storage device is greater than or equal to the maximum state of charge at the t-1th time step; when the third judgment result indicates that the state of charge of the energy storage device is greater than or equal to the maximum state of charge at the t-1th time step, zero is determined as the discharge power of the energy storage device at the t-1th time step; or, when the third judgment result indicates that the state of charge of the energy storage device is less than the maximum state of charge at the t-1th time step, the minimum value of the difference between the power supply power of the power generation device at the tth time step and the upper limit of the electrolysis power of the electrolytic cell and the maximum charging power of the energy storage device is determined as the charging power of the energy storage device at the tth time step.

[0009] In one possible implementation, the device parameters include the maximum state of charge, maximum discharge power, maximum charging power of the energy storage device, and the electrolysis power range of the electrolyzer. According to the power supply power of the power generation device at the t-th time step, the state of charge of the energy storage device at the t-1th time step, and the equipment parameters of the green electricity off-grid hydrogen production system, the electrolysis power of the electrolyzer and the electric power of the energy storage device at the t-th time step are determined, including: when the power supply power is less than the lower limit of the electrolysis power of the electrolyzer, judging whether the state of charge of the energy storage device at the t-1th time step is less than the maximum state of charge, and obtaining a fourth judgment result; the fourth judgment result indicates that at the t-1th time step When the state of charge of the energy storage device is less than the maximum state of charge, determine whether the sum of the power supply power of the power generation device and the maximum discharge power of the energy storage device at the t-th time step is less than or equal to the lower limit of the electrolysis power of the electrolytic cell, and obtain a fifth judgment result; when the fifth judgment result indicates that the sum of the power supply power of the power generation device and the maximum discharge power of the energy storage device at the t-th time step is less than or equal to the lower limit of the electrolysis power of the electrolytic cell, 0 is determined as the electrolysis power of the electrolytic cell at the t-th time step, and the minimum value of the power supply power of the power generation device and the maximum charging power of the energy storage device at the t-th time step is determined as the charging power of the energy storage device at the t-th time step.

[0010] In a possible implementation, the device parameters include the minimum state of charge of the energy storage device, and the method further includes: when the fifth judgment result indicates that the sum of the power supply power of the power generation device and the maximum discharge power of the energy storage device at the t-th time step is greater than the lower limit of the electrolysis power of the electrolytic cell, judging whether the state of charge of the energy storage device at the t-1th time step is greater than the minimum state of charge, and obtaining a sixth judgment result; when the sixth judgment result indicates that the state of charge of the energy storage device at the t-1th time step is greater than the minimum state of charge, summing the power supply power of the power generation device at the t-th time step and the maximum discharge power of the energy storage device. The sum of the maximum discharge powers of the energy storage devices is determined as the electrolysis power of the electrolytic cell at the t-th time step, and the maximum discharge power of the energy storage device is determined as the discharge power of the energy storage device at the t-th time step; or, when the sixth judgment result indicates that the state of charge of the energy storage device at the t-1th time step is less than or equal to the minimum state of charge, zero is determined as the electrolysis power of the electrolytic cell at the t-th time step, and the minimum value between the power supply power of the power generation device at the t-1th time step and the maximum charging power of the energy storage device is determined as the charging power of the energy storage device at the t-th time step.

[0011] In a possible implementation, the method further includes: when the fourth judgment result indicates that the state of charge of the energy storage device at the t-1th time step is greater than or equal to the maximum state of charge, judging whether the sum of the power supply power of the power generation device and the maximum discharge power of the energy storage device at the tth time step is less than or equal to the lower limit of the electrolysis power of the electrolytic cell, and obtaining a seventh judgment result; when the seventh judgment result indicates that the sum of the power supply power of the power generation device and the maximum discharge power of the energy storage device at the tth time step is less than or equal to the lower limit of the electrolysis power of the electrolytic cell, determining zero as the tth time step. The electrolysis power of the electrolytic cell at the t-th time step is determined as the electrolysis power of the electrolytic cell at the t-th time step, and zero is determined as the charging power of the energy storage device at the t-th time step; or, when the seventh judgment result indicates that the sum of the power supply power of the power generation device and the maximum discharge power of the energy storage device at the t-th time step is greater than the lower limit of the electrolysis power of the electrolytic cell, the sum of the power supply power of the power generation device and the maximum discharge power of the energy storage device at t time steps is determined as the electrolysis power of the electrolytic cell at the t-th time step, and the maximum discharge power of the energy storage device is determined as the discharge power of the energy storage device at the t-th time step.

[0012] In one possible implementation, the green electricity off-grid hydrogen production system includes a wind power off-grid hydrogen production system, the power generation equipment includes a wind turbine, the power supply includes wind power, and obtaining the power supply of the power generation equipment at the tth time step includes: obtaining wind speed data at the tth time step; inputting the wind speed data at the tth time step into a preset wind power generation model to obtain the wind power of the wind turbine at the tth time step; after determining the total hydrogen production based on the sum of the hydrogen production of T time steps within a preset time range, the method also includes: determining the levelized cost of hydrogen based on the ratio of the sum of the capital cost and the operating cost of the wind power off-grid hydrogen production system within the preset time range to the total hydrogen production.

[0013] According to one aspect of the present disclosure, an evaluation device is provided, the device being used to evaluate the total hydrogen production of a green electricity off-grid hydrogen production system within a preset time range, the green electricity off-grid hydrogen production system comprising a power generation device, an electrolyzer and an energy storage device, the preset time range comprising T time steps, T being an integer greater than 1, the device comprising: a first determination module, being used to determine the electrolysis power of the electrolyzer at the t-th time step according to the power supply power of the power generation device at the t-th time step, the charge state of the energy storage device at the t-1th time step, and the equipment parameters of the green electricity off-grid hydrogen production system rate and the electric power of the energy storage device, wherein the electric power includes charging power and discharging power, and t is any integer from 1 to T; a second determination module, used to determine the state of charge of the energy storage device at the t-th time step according to the electric power of the energy storage device at the t-th time step and the state of charge of the energy storage device at the t-1th time step, and determine the hydrogen production at the t-th time step according to the electrolysis power of the electrolyzer at the t-th time step; a third determination module, used to determine the total hydrogen production according to the sum of the hydrogen production of T time steps within a preset time range.

[0014] In a possible implementation, the device parameters include the minimum state of charge and the maximum discharge power of the energy storage device, and the electrolysis power range of the electrolytic cell. The first determination module is used to: when the power supply power is within the electrolysis power range of the electrolytic cell, determine whether the state of charge of the energy storage device is greater than the minimum state of charge at the t-1th time step to obtain a first judgment result; when the first judgment result indicates that the state of charge of the energy storage device is greater than the minimum state of charge at the t-1th time step, determine whether the power supply power of the power generation device at the t-1th time step is within the electrolysis power range of the electrolytic cell. The second judgment result is obtained by determining whether the sum of the power supply power of the power generation equipment and the maximum discharge power of the energy storage equipment at the t-th time step is greater than or equal to the upper limit of the electrolysis power of the electrolyzer; when the second judgment result indicates that the sum of the power supply power of the power generation equipment and the maximum discharge power of the energy storage equipment at the t-th time step is greater than or equal to the upper limit of the electrolysis power of the electrolyzer, the upper limit of the electrolysis power of the electrolyzer is determined as the electrolysis power of the electrolyzer at the t-th time step, and the difference between the upper limit of the electrolysis power of the electrolyzer and the power supply power of the power generation equipment at the t-th time step is determined as the discharge power of the energy storage equipment at the t-th time step.

[0015] In a possible implementation, the first determination module is further used for: when the first judgment result indicates that the state of charge of the energy storage device at the t-1th time step is less than or equal to the minimum state of charge, determining the power supply power of the power generation device at the tth time step as the electrolysis power of the electrolyzer at the tth time step, and determining zero as the discharge power of the energy storage device at the tth time step; when the second judgment result indicates that the sum of the power supply power of the power generation device at the tth time step and the maximum discharge power of the energy storage device is less than the upper limit of the electrolysis power of the electrolyzer, determining the sum of the power supply power of the power generation device at the tth time step and the maximum discharge power of the energy storage device as the electrolysis power of the electrolyzer at the tth time step, and determining the maximum discharge power of the energy storage device as the discharge power of the energy storage device at the tth time step.

[0016] In a possible implementation, the device parameters include the maximum state of charge and the maximum charging power of the energy storage device, and the electrolysis power range of the electrolytic cell. The first determination module is used to: when the power supply power is greater than the upper limit of the electrolysis power of the electrolytic cell, determine the upper limit of the electrolysis power of the electrolytic cell as the electrolysis power of the electrolytic cell at the t-th time step; determine whether the state of charge of the energy storage device is greater than or equal to the maximum state of charge at the t-1th time step, and obtain a third judgment result; when the third judgment result indicates that the state of charge of the energy storage device at the t-1th time step is greater than or equal to the maximum state of charge, determine zero as the discharge power of the energy storage device at the t-th time step; or, when the third judgment result indicates that the state of charge of the energy storage device at the t-1th time step is less than the maximum state of charge, determine the minimum value of the difference between the power supply power of the power generation device at the t-th time step and the upper limit of the electrolysis power of the electrolytic cell and the maximum charging power of the energy storage device as the charging power of the energy storage device at the t-th time step.

[0017] In a possible implementation, the device parameters include the maximum state of charge, maximum discharge power, maximum charging power of the energy storage device, and the electrolysis power range of the electrolytic cell. The first determination module is used to: when the power supply power is less than the lower limit of the electrolysis power of the electrolytic cell, determine whether the state of charge of the energy storage device is less than the maximum state of charge at the t-1th time step to obtain a fourth judgment result; when the fourth judgment result indicates that the state of charge of the energy storage device is less than the maximum state of charge at the t-1th time step, determine whether the power supply power of the power generation device at the t-1th time step is less than the maximum state of charge. The fifth judgment result is obtained by determining whether the sum of the power supply power of the power generation device and the maximum discharge power of the energy storage device at the t-th time step is less than or equal to the lower limit of the electrolysis power of the electrolyzer; when the fifth judgment result indicates that the sum of the power supply power of the power generation device and the maximum discharge power of the energy storage device at the t-th time step is less than or equal to the lower limit of the electrolysis power of the electrolyzer, 0 is determined as the electrolysis power of the electrolyzer at the t-th time step, and the minimum value of the power supply power of the power generation device and the maximum charging power of the energy storage device at the t-th time step is determined as the charging power of the energy storage device at the t-th time step.

[0018] In one possible implementation, the device parameters include the minimum state of charge of the energy storage device, and the first determination module is further used to: when the fifth judgment result indicates that the sum of the power supply power of the power generation device and the maximum discharge power of the energy storage device at the t-th time step is greater than the lower limit of the electrolysis power of the electrolytic cell, determine whether the state of charge of the energy storage device at the t-1th time step is greater than the minimum state of charge, and obtain a sixth judgment result; when the sixth judgment result indicates that the state of charge of the energy storage device at the t-1th time step is greater than the minimum state of charge, the power supply power of the power generation device at the t-th time step is The sum of the sixth judgment result and the maximum discharge power of the energy storage device is determined as the electrolysis power of the electrolytic cell at the t-th time step, and the maximum discharge power of the energy storage device is determined as the discharge power of the energy storage device at the t-th time step; or, when the sixth judgment result indicates that the charge state of the energy storage device at the t-1th time step is less than or equal to the minimum charge state, zero is determined as the electrolysis power of the electrolytic cell at the t-th time step, and the minimum value between the power supply power of the power generation device at the t-1th time step and the maximum charging power of the energy storage device is determined as the charging power of the energy storage device at the t-th time step.

[0019] In a possible implementation, the first determination module is further used to: when the fourth judgment result indicates that the state of charge of the energy storage device at the t-1th time step is greater than or equal to the maximum state of charge, determine whether the sum of the power supply power of the power generation device and the maximum discharge power of the energy storage device at the tth time step is less than or equal to the lower limit of the electrolysis power of the electrolytic cell, and obtain a seventh judgment result; when the seventh judgment result indicates that the sum of the power supply power of the power generation device and the maximum discharge power of the energy storage device at the tth time step is less than or equal to the lower limit of the electrolysis power of the electrolytic cell, determine zero as The electrolysis power of the electrolytic cell at the t-th time step, and zero is determined as the charging power of the energy storage device at the t-th time step; or, when the seventh judgment result indicates that the sum of the power supply power of the power generation device and the maximum discharge power of the energy storage device at the t-th time step is greater than the lower limit of the electrolysis power of the electrolytic cell, the sum of the power supply power of the power generation device and the maximum discharge power of the energy storage device at t time steps is determined as the electrolysis power of the electrolytic cell at the t-th time step, and the maximum discharge power of the energy storage device is determined as the discharge power of the energy storage device at the t-th time step.

[0020] In one possible implementation, the green electricity off-grid hydrogen production system includes a wind power off-grid hydrogen production system, the power generation equipment includes a wind turbine, the power supply includes wind power, and the first determination module is used to: obtain wind speed data at the tth time step; input the wind speed data at the tth time step into a preset wind power generation model to obtain the wind power of the wind turbine at the tth time step; after determining the total hydrogen production based on the sum of the hydrogen production of T time steps within a preset time range, the device also includes a fourth determination module, which is used to: determine the levelized cost of hydrogen based on the ratio of the sum of the capital cost and the operating cost of the wind power off-grid hydrogen production system within the preset time range to the total hydrogen production.

[0021] According to another aspect of the present disclosure, an electronic device is provided, comprising: a processor; and a memory for storing processor-executable instructions; wherein the processor is configured to implement the above method when executing the instructions stored in the memory.

[0022] According to another aspect of the present disclosure, a non-volatile computer-readable storage medium is provided, on which computer program instructions are stored, wherein the computer program instructions implement the above method when executed by a processor.

[0023] According to another aspect of the present disclosure, a computer program product is provided, including a computer-readable code, or a non-volatile computer-readable storage medium carrying the computer-readable code. When the computer-readable code runs in a processor of an electronic device, the processor in the electronic device executes the above method.

[0024] Through the evaluation method of the embodiment of the present disclosure, the electrolysis power of the electrolyzer and the charging power or discharging power of the energy storage device can be dynamically adjusted in real time according to the power supply power of the power generation equipment, the charge state of the energy storage device, and the equipment parameters of the green power off-grid hydrogen production system, with the set time step as the unit. This response mechanism helps to maximize the use of renewable energy and improve the operating efficiency and service life of the green power off-grid hydrogen production system. In addition, based on the electrolysis power of the electrolyzer at the current time step, the hydrogen production at each time step can be accurately calculated, which helps to formulate a reasonable production plan.

[0025] Further features and aspects of the present disclosure will become apparent from the following detailed description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features, and aspects of the disclosure and, together with the description, serve to explain the principles of the disclosure.

[0027] Figure 1A schematic diagram of a green electricity off-grid hydrogen production system according to an embodiment of the present disclosure is shown.

[0028] Figure 2 A flow chart showing an evaluation method according to an embodiment of the present disclosure.

[0029] Figure 3 A schematic diagram of determining the electrolytic power of an electrolytic cell and the electric power of an energy storage device according to an embodiment of the present disclosure is shown.

[0030] Figure 4 A schematic diagram is shown of another method for determining the electrolytic power of an electrolytic cell and the electric power of an energy storage device according to an embodiment of the present disclosure.

[0031] Figure 5 A schematic diagram is shown of another method for determining the electrolytic power of an electrolytic cell and the electric power of an energy storage device according to an embodiment of the present disclosure.

[0032] Figure 6 A schematic diagram of a curve showing wind power and electrolysis power according to an embodiment of the present disclosure.

[0033] Figure 7 A graph schematically shows the hydrogen production according to an embodiment of the present disclosure.

[0034] Figure 8 A schematic diagram of a curve showing the state of charge according to an embodiment of the present disclosure.

[0035] Fig. 9 A block diagram of an evaluation device according to an embodiment of the present disclosure is shown.

[0036] Fig.10 It is a block diagram of an electronic device according to an exemplary embodiment. DETAILED DESCRIPTION

[0037] Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0038] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0039] In addition, in order to better illustrate the present disclosure, numerous specific details are given in the following specific embodiments. It should be understood by those skilled in the art that the present disclosure can also be implemented without certain specific details. In some examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the main purpose of the present disclosure.

[0040] Figure 1 A schematic diagram of a green electricity off-grid hydrogen production system according to an embodiment of the present disclosure is shown. Figure 1 As shown, the green electricity off-grid hydrogen production system includes a power generation device 1, an electrolyzer 2 and an energy storage device 3. The electricity generated by the power generation device 1 can be directly supplied to the electrolyzer 2 without passing through the power grid, so as to drive the electrolyzer 2 to electrolyze water into hydrogen. The hydrogen produced by the electrolyzer 2 can be compressed by a gas compressor and then transported to a gas storage tank. In order to provide stable electricity to the electrolyzer 2, an energy storage device 3 can be equipped in the green electricity off-grid hydrogen production system, so that the energy storage device 3 can be charged when the electricity provided by the power generation device 1 is abundant, and the energy storage device 3 can supplement the electricity when the electricity provided by the power generation device 1 is insufficient.

[0041] For example, green electricity refers to electricity with zero or close to zero carbon dioxide emissions during the production process, which has a lower impact on the environment than electricity produced by other means (such as thermal power generation). The source of green electricity can be solar energy, wind power, biomass energy, geothermal energy, etc., and the embodiments of the present disclosure are not limited to this.

[0042] For example, the green electricity off-grid hydrogen production system can be a wind power off-grid hydrogen production system, and the power generation equipment 1 can be a wind turbine; for example, the green electricity off-grid hydrogen production system can be a hydropower off-grid hydrogen production system, and the power generation equipment 1 can be a hydropower generator; for another example, the green electricity off-grid hydrogen production system can also be a photovoltaic off-grid hydrogen production system, and the power generation equipment 1 can be a solar generator; for another example, the green electricity off-grid hydrogen production system can also be a photovoltaic and wind complementary off-grid hydrogen production system, and the power generation equipment 1 can be a unit composed of a wind turbine and a solar generator; the embodiments of the present disclosure do not specifically limit the type of the power generation equipment 1 in the green electricity off-grid hydrogen production system.

[0043] Exemplarily, the energy storage device 3 can realize the mutual conversion between electrical energy and chemical energy, and is used to store electrical energy in chemical form and release it when needed. It may include batteries, battery packs, supercapacitors, etc. The embodiments of the present disclosure do not limit the specific type of the energy storage device 3.

[0044] Figure 2 A flow chart of an evaluation method according to an embodiment of the present disclosure is shown. Figure 2 As shown, the method is used to evaluate the total hydrogen production of the green electricity off-grid hydrogen production system within a preset time range, the preset time range includes T time steps, and the method includes:

[0045] In step S11, the electrolysis power of the electrolyzer 2 and the electric power of the energy storage device 3 at the t-th time step are determined according to the power supply power of the power generation device 1 at the t-th time step, the charge state of the energy storage device 3 at the t-1th time step, and the equipment parameters of the green electricity off-grid hydrogen production system, wherein the electric power includes charging power and discharging power, t is any integer from 1 to T, and T is an integer greater than 1;

[0046] In step S12, the state of charge of the energy storage device 3 at the t-th time step is determined according to the electric power of the energy storage device 3 at the t-th time step and the state of charge of the energy storage device 3 at the t-1th time step, and the hydrogen production at the t-th time step is determined according to the electrolysis power of the electrolyzer 2 at the t-th time step;

[0047] In step S13, the total hydrogen production is determined according to the sum of the hydrogen production of T time steps within the preset time range.

[0048] In this way, the electrolysis power of the electrolyzer 2 and the charging power or discharging power of the energy storage device 3 can be dynamically adjusted in real time according to the power supply power of the power generation equipment 1, the charge state of the energy storage device 3, and the equipment parameters of the green power off-grid hydrogen production system, with the set time step as the unit. This response mechanism helps to maximize the use of renewable energy and improve the operating efficiency and service life of the green power off-grid hydrogen production system. In addition, based on the electrolysis power of the electrolyzer 2 at the current time step, the hydrogen production at each time step can be accurately calculated, which helps to formulate a reasonable production plan.

[0049] In a possible implementation, the preset time range may include T time steps, that is, from the first time step to the Tth time step, and the tth time step represents a time step from the first time step to the Tth time step. For example, assuming that the preset time range is one year, 15 minutes is one time step, and the number of time steps that can be included in the time range of one year is T=365×24×60÷15=35040, where t is any integer from 1 to 35040. It should be understood that the embodiments of the present disclosure do not limit the specific values ​​of the preset time range and the number of time steps T, and can be set according to the actual application scenario.

[0050] In one possible implementation, the power supply of the power generation device 1 represents the average power of the power generation device 1 supplying electric energy in the current (e.g., t-th) time step. The state of charge (SOC) of the energy storage device 3 represents the ratio of the current power of the energy storage device 3 to the power of its fully charged state, usually expressed as a percentage. The higher the state of charge of the energy storage device 3, the more sufficient the power of the energy storage device 3; the lower the state of charge of the energy storage device 3, the more insufficient the power of the energy storage device 3. The equipment parameters of the green electricity off-grid hydrogen production system may include the maximum charge state, minimum charge state, maximum discharge power, maximum charging power of the energy storage device 3, the electrolysis power range of the electrolyzer 2, and the hardware performance parameters of the power generation device 1 itself.

[0051] In a possible implementation, for the first (t=1) time step, in step S11, the green electricity off-grid hydrogen production system has just started, there is no previous time step, and the state of charge SOC(0) of the energy storage device 3 can be initialized to 100%.

[0052] The power supply of the power generation device 1 in the first time step can be determined by the green energy intensity (such as wind speed, sunlight intensity, etc.) in the time step and the hardware performance parameters of the power generation device 1 itself. For example, the green energy intensity (such as wind speed) in the current time step can be input into a preset mathematical model to determine the power supply of the power generation device 1 in the time step. Among them, the preset data model can be constructed based on the hardware performance parameters of the power generation device 1 itself, and the embodiments of the present disclosure do not limit the specific form of the mathematical model.

[0053] The equipment parameters of the green electricity off-grid hydrogen production system, such as the maximum charge state, minimum charge state, maximum discharge power, and maximum charging power of the energy storage device 3, the electrolysis power range of the electrolyzer 2, and the hardware performance parameters of the power generation equipment 1 itself, are determined by the hardware equipment of the green electricity off-grid hydrogen production system, and most of them are fixed values. As the equipment of the green electricity off-grid hydrogen production system ages (or equipment components are replaced), the equipment parameters of the green electricity off-grid hydrogen production system may change. The values ​​of the equipment parameters of the green electricity off-grid hydrogen production system can be set according to the specific application scenario, and the embodiments of the present disclosure do not impose specific restrictions on this.

[0054] According to the power supply power of the power generation equipment 1 at the first time step, the initially set state of charge SOC(0)=100% of the energy storage device 3, and the equipment parameters of the green electricity off-grid hydrogen production system, the electrolysis power of the electrolyzer 2 and the electric power of the energy storage device 3 at the first time step are determined, wherein the electric power includes charging power and discharging power.

[0055] If the power supply power of the power generation device 1 is within the electrolysis power range at the first time step, combined with the state of charge SOC(0) of the energy storage device 3, it is determined that the energy storage device 3 has the discharge capacity at the first time step. The electrolysis power of the electrolyzer 2 can be supplied by the power generation device 1 and the energy storage device 3 together, or only by the power generation device 1. The electrolysis power of the electrolyzer 2 and the power of the energy storage device 3 can be determined according to the specific supply situation.

[0056] If the power supply power of the power generation device 1 is greater than the upper limit of the electrolysis power in the first time step, the power generation device 1 itself can provide sufficient power supply power to the electrolytic cell 2, and the electrolysis power of the electrolytic cell 2 is the upper limit of the electrolysis power. At the same time, since the state of charge SOC(0) of the energy storage device 3 is in a fully charged state, the energy storage device 3 does not need to be charged or discharged, and the charging power and discharging power of the energy storage device 3 are the same, both of which are 0.

[0057] If the power supply power of the power generation device 1 is less than the lower limit of the electrolysis power in the first time step, it is also necessary to combine the charge state SOC(0) of the energy storage device 3 to determine whether the energy storage device 3 has the discharge capacity in the first time step or neither discharges nor charges, so as to decide whether the green electricity off-grid hydrogen production system is shut down, or whether the power generation device 1 and the energy storage device 3 jointly supply power to the electrolyzer 2. The electrolysis power of the electrolyzer 2 and the power of the energy storage device 3 can be determined according to the specific supply situation.

[0058] In a possible implementation, for the first (t=1) time step, in step S12, the state of charge SOC(1) of the energy storage device 3 at the first time step can be determined according to the electric power of the energy storage device 3 at the first time step and the state of charge SOC(0) of the energy storage device 3, where SOC(1)=SOC(0)+[P c (1)·△t] / Q-[P disc (1)·△t] / Q, where P c (1) represents the charging power of energy storage device 3 at the first time step, P disc (1) represents the discharge power of the energy storage device 3 in the first time step, Q represents the total capacity of the energy storage device 3, and △t represents the length of the time step.

[0059] And the hydrogen production per minute at the first time step can be determined according to the electrolysis power of electrolyzer 2 at the first time step Thus, the hydrogen production at the first time step is obtained Among them, P elz (1) represents the electrolysis power of electrolyzer 2 at the first time step, △t represents the length of the time step, η represents the electric-hydrogen conversion efficiency, and the specific value of η is determined by the equipment performance of electrolyzer 2. The embodiments of the present disclosure do not limit the specific value of η.

[0060] In a possible implementation, for the second (t=2) time step, the electrolysis power of the electrolyzer 2 and the electric power of the energy storage device 3 at the second time step can be determined according to the power supply power of the power generation device 1 at the second time step, the state of charge SOC(1) of the energy storage device 3 at the first time step, and the equipment parameters of the green electricity off-grid hydrogen production system. Among them, the state of charge SOC(1) of the energy storage device 3 can be obtained in the first time step stage, and the power supply power of the power generation device 1 at the second time step and the equipment parameters of the green electricity off-grid hydrogen production system can be obtained by referring to the power supply power of the power generation device 1 at the first time step and the equipment parameters of the green electricity off-grid hydrogen production system, which will not be repeated here.

[0061] If the power supply power of the power generation device 1 in the second time step is within the electrolysis power range, combined with the charge state SOC(1) of the energy storage device 3 in the previous time step, it is determined whether the energy storage device 3 has the discharge capacity in the second time step, thereby determining whether the electrolysis power of the electrolytic cell 2 is supplied by the power generation device 1 and the energy storage device 3 together, or only by the power generation device 1. The electrolysis power of the electrolytic cell 2 and the electric power of the energy storage device 3 can be determined according to the specific supply situation.

[0062] If the power supply of the power generation device 1 is greater than the upper limit of the electrolysis power in the second time step, the power generation device 1 itself can provide sufficient power supply to the electrolytic cell 2, and the electrolysis power of the electrolytic cell 2 is the upper limit of the electrolysis power. At the same time, the state of charge SOC(1) of the energy storage device 3 in the previous time step can be combined to determine whether the energy storage device 3 is allowed to charge in this time step. If the state of charge SOC(1) of the energy storage device 3 is in a fully charged state, the charging power and the discharging power of the energy storage device 3 are the same, both of which are 0; if the state of charge SOC(1) of the energy storage device 3 is not in a fully charged state, the charging power of the energy storage device 3 can be determined as the minimum value of the difference between the power supply power and the upper limit of the electrolysis power and the maximum charging power.

[0063] If the power supply power of the power generation device 1 in the second time step is less than the lower limit of the electrolysis power, it is also necessary to combine the charge state SOC(1) of the energy storage device 3 in the previous time step to determine whether the energy storage device 3 has the ability to charge or discharge in the second time step, so as to decide whether the green electricity off-grid hydrogen production system is shut down, or the electrolyzer 2 is shut down and the energy storage device 3 is charged, or the power generation device 1 and the energy storage device 3 jointly supply power to the electrolyzer 2. The electrolysis power of the electrolyzer 2 and the power of the energy storage device 3 can be determined according to the specific supply situation.

[0064] In a possible implementation, for the second time step, in step S12, the state of charge SOC(2) of the energy storage device 3 at the second time step can be determined according to the electric power of the energy storage device 3 at the second time step and the state of charge SOC(1) of the energy storage device at the previous time step, where SOC(2)=SOC(1)+[P c (2)·△t] / Q-[P disc (2)·△t] / Q, where P c (2) represents the charging power of energy storage device 3 at the second time step, P disc (2) represents the discharge power of the energy storage device 3 in the second time step, Q represents the total capacity of the energy storage device 3, and △t represents the length of the time step.

[0065] And the hydrogen production per minute at the second time step can be determined according to the electrolysis power of electrolyzer 2 at the second time step Thus, the hydrogen production at the second time step is obtained Among them, P elz (2) represents the electrolysis power of electrolyzer 2 at the second time step, △t represents the length of the time step, η represents the electric-hydrogen conversion efficiency, and the specific value of η is determined by the equipment performance of electrolyzer 2. The embodiments of the present disclosure do not limit the specific value of η.

[0066] By analogy, for the t-th time step, the electrolysis power of the electrolyzer 2 and the electric power of the energy storage device 3 at the t-th time step can be determined according to the power supply power of the power generation device 1 at the t-th time step, the state of charge SOC(t-1) of the energy storage device 3 at the t-1th time step, and the equipment parameters of the green electricity off-grid hydrogen production system. Among them, the state of charge SOC(t-1) of the energy storage device 3 can be obtained at the t-1th time step stage, and the power supply power of the power generation device 1 at the t-th time step and the equipment parameters of the green electricity off-grid hydrogen production system can be obtained by referring to the power supply power of the power generation device 1 at the first time step and the equipment parameters of the green electricity off-grid hydrogen production system, which will not be repeated here.

[0067] If the power supply power of the power generation device 1 at the t-th time step is within the electrolysis power range, combined with the charge state SOC(t-1) of the energy storage device 3 at the previous time step, it is determined whether the energy storage device 3 has the discharge capacity at the t-th time step, thereby determining whether the electrolysis power of the electrolytic cell 2 is supplied by both the power generation device 1 and the energy storage device 3, or only by the power generation device 1. The electrolysis power of the electrolytic cell 2 and the electric power of the energy storage device 3 can be determined according to the specific supply situation.

[0068] If the power supply power of the power generation device 1 at the t-th time step is greater than the upper limit of the electrolysis power, the power generation device 1 itself can provide sufficient power supply power to the electrolytic cell 2, and the electrolysis power of the electrolytic cell 2 is the upper limit of the electrolysis power. At the same time, the state of charge SOC (t-1) of the energy storage device 3 at the previous time step can be combined to determine whether the energy storage device 3 is allowed to charge at this time step. If the state of charge SOC (t-1) of the energy storage device 3 is fully charged, the charging power and discharge power of the energy storage device 3 are the same, both 0; if the state of charge SOC (t-1) of the energy storage device 3 is not fully charged, the charging power of the energy storage device 3 can be determined as the minimum value of the difference between the power supply power and the upper limit of the electrolysis power and the maximum charging power.

[0069] If the power supply power of the power generation device 1 at the t-th time step is less than the lower limit of the electrolysis power, it is also necessary to combine the charge state SOC(t-1) of the energy storage device 3 at the previous time step to determine whether the energy storage device 3 has the ability to charge or discharge at the t-th time step, thereby deciding whether the green electricity off-grid hydrogen production system is shut down, or the electrolyzer 2 is shut down and the energy storage device 3 is charged, or the power generation device 1 and the energy storage device 3 jointly supply power to the electrolyzer 2. The electrolysis power of the electrolyzer 2 and the power of the energy storage device 3 can be determined according to the specific supply situation.

[0070] In a possible implementation, for the t-th time step, in step S12, the state of charge SOC(t) of the energy storage device 3 at the t-th time step can be determined according to the electric power of the energy storage device 3 at the t-th time step and the state of charge SOC(t-1) of the energy storage device at the previous time step, SOC(t)=SOC(t-1)+[P c (t)·△t] / Q-[P disc (t)·△t] / Q, where P c (t) represents the charging power of energy storage device 3 at the tth time step, P disc (t) represents the discharge power of the energy storage device 3 at the t-th time step, Q represents the total capacity of the energy storage device 3, and Δt represents the length of the time step.

[0071] And the hydrogen production per minute at the tth time step can be determined according to the electrolysis power of electrolyzer 2 at the tth time step Thus, the hydrogen production at the tth time step is obtained Among them, P elz (t) represents the electrolysis power of electrolyzer 2 at the tth time step, △t represents the length of the time step, η represents the electricity-to-hydrogen conversion efficiency, and the specific value of η is determined by the equipment performance of electrolyzer 2. The embodiments of the present disclosure do not limit the specific value of η.

[0072] Until the Tth (t=T) time step is executed, the electrolysis power of the electrolyzer 2 and the electric power of the energy storage device 3 at the Tth time step can be determined based on the power supply power of the power generation equipment 1 at the Tth time step, the state of charge SOC(T-1) of the energy storage device 3 at the T-1th time step, and the equipment parameters of the green electricity off-grid hydrogen production system.

[0073] For the Tth (t=T) time step, in step S12, the state of charge SOC(T) of the energy storage device 3 at the Tth time step can be determined according to the electric power of the energy storage device 3 at the Tth time step and the state of charge SOC(T-1) of the energy storage device at the previous time step, SOC(T)=SOC(T-1)+[P c (T)·△t] / Q-[P disc (T)·△t] / Q, where P c (T) represents the charging power of energy storage device 3 at the Tth time step, P disc (T) represents the discharge power of the energy storage device 3 at the Tth time step, Q represents the total capacity of the energy storage device 3, and Δt represents the length of the time step.

[0074] And the hydrogen production per minute at the Tth time step can be determined according to the electrolysis power of electrolyzer 2 at the Tth time step Thus, the hydrogen production at the Tth time step is obtained Among them, P elz (T) represents the electrolysis power of electrolyzer 2 at the Tth time step, △t represents the length of the time step, η represents the electricity-to-hydrogen conversion efficiency, and the specific value of η is determined by the equipment performance of electrolyzer 2. The embodiments of the present disclosure do not limit the specific value of η.

[0075] In step S13, the sum of the hydrogen production of T time steps within the preset time range can be Determined as the total hydrogen production.

[0076] The following uses a wind power off-grid hydrogen production system as an example to explain the evaluation method of the embodiment of the present disclosure.

[0077] In a possible implementation, the green electricity off-grid hydrogen production system includes a wind power off-grid hydrogen production system, the power generation equipment 1 includes a wind turbine, the power supply includes wind power, and step S11 obtains the power supply of the power generation equipment 1 at the t-th time step, including: obtaining the wind speed data v at the t-th time step w ; The wind speed data v at the tth time step w , input the preset wind power generation model, and obtain the wind power P of the wind turbine generator at the tth time step w (t).

[0078] For example, the preset wind power generation model can be expressed as:

[0079]

[0080] Among them, v w is the wind speed data at the tth time step; v ci is the cut-in wind speed, i.e. the minimum wind speed for wind turbines to generate electricity; v r is the rated wind speed, that is, the wind speed that the wind turbine can withstand when it works normally under the matching power belt and runs at the best efficiency; v co is the cut-out wind speed, i.e. the maximum wind speed at which the wind turbine is connected to the grid for power generation; P w (t) is the wind power of the wind turbine at the tth time step; ρ is the air mass density; A w is the swept area, that is, the area swept by the blades of the wind turbine when they rotate: C p is the wind energy capture coefficient, which indicates the conversion efficiency of wind turbines in converting wind energy into electrical energy, and its value range is [0,1]; p r It is the rated power of the wind turbine, that is, the maximum output power that the wind turbine can achieve.

[0081] In this way, the wind speed data v at the tth time step can be input according to the wind power generation model. w , calculate the wind power P of the wind turbine at the tth time step w (t), which is conducive to obtaining the wind power P of the wind turbine more efficiently and accurately w (t).

[0082] Then, the wind power P of the wind turbine generator at the tth time step can be obtained. w (t), the state of charge SOC(t-1) of energy storage device 3 at the t-1th time step, and the minimum state of charge SOC of energy storage device 3 min , the maximum state of charge SOC of energy storage device 3 max 、The maximum discharge power P of energy storage device 3 disc,max , the maximum charging power P of energy storage device 3 c,max , the electrolysis power range of the electrolytic cell 2 [P elz,min ,P elz,max ], determined as the electrolysis power P of electrolytic cell 2 at the tth time step elz (t) and the electric power of the energy storage device 3. The electric power of the energy storage device 3 at the t-th time step may include the discharge power P of the energy storage device 3 disc (t) and charging power P c (t).

[0083] In a possible implementation, step S11 may include: when the power supply power is within the electrolysis power range of the electrolytic cell 2, determining whether the state of charge of the energy storage device 3 is greater than the minimum state of charge at the t-1th time step, and obtaining a first determination result;

[0084] Optionally, when the first judgment result indicates that the state of charge of the energy storage device 3 at the t-1th time step is less than or equal to the minimum state of charge, the power supply power of the power generation device 1 at the tth time step is determined as the electrolysis power of the electrolytic cell 2 at the tth time step, and zero is determined as the discharge power of the energy storage device 3 at the tth time step; in this way, the energy storage device 3 can be prevented from operating under excessive discharge, thereby protecting the energy storage device 3 from damage and extending its service life.

[0085] Optionally, when the first judgment result indicates that the state of charge of the energy storage device 3 at the t-1th time step is greater than the minimum state of charge, it is determined whether the sum of the power supply power of the power generation device 1 and the maximum discharge power of the energy storage device 3 at the tth time step is greater than or equal to the upper limit of the electrolysis power of the electrolytic cell 2 to obtain a second judgment result;

[0086] Optionally, when the second judgment result indicates that the sum of the power supply power of the power generation equipment 1 and the maximum discharge power of the energy storage device 3 at the t-th time step is greater than or equal to the upper limit of the electrolysis power of the electrolytic cell 2, the upper limit of the electrolysis power of the electrolytic cell 2 is determined as the electrolysis power of the electrolytic cell 2 at the t-th time step, and the difference between the upper limit of the electrolysis power of the electrolytic cell 2 and the power supply power of the power generation equipment 1 at the t-th time step is determined as the discharge power of the energy storage device 3 at the t-th time step.

[0087] Optionally, when the second judgment result indicates that the sum of the power supply power of the power generation device 1 and the maximum discharge power of the energy storage device 3 at the t-th time step is less than the upper limit of the electrolysis power of the electrolytic cell 2, the sum of the power supply power of the power generation device 1 and the maximum discharge power of the energy storage device 3 at the t-th time step is determined as the electrolysis power of the electrolytic cell 2 at the t-th time step, and the maximum discharge power of the energy storage device 3 is determined as the discharge power of the energy storage device 3 at the t-th time step.

[0088] In this way, the time step can be used as an adjustment unit, and the green electricity off-grid hydrogen production system is adjusted once per time step. In each time step, the electrolysis power of electrolyzer 2 and the discharge power of energy storage device 3 are adjusted according to energy supply (such as the power supply of power generation equipment 1 and the charge state of energy storage device 3) and demand conditions (such as electrolyzer 2 produces as much hydrogen as possible), thereby improving the flexibility and response speed of the system, thereby better coping with the uncertainty of energy supply, optimizing energy utilization efficiency and reducing energy waste. In addition, by limiting the electrolysis power of electrolyzer 2 to not exceed its electrolysis power upper limit and reasonably allocating the power output of power generation equipment 1 and energy storage device 3, it is helpful for the safe operation of electrolyzer 2 and preventing equipment damage or safety accidents caused by power overload.

[0089] Figure 3 A schematic diagram of determining the electrolytic power of an electrolytic cell and the electric power of an energy storage device according to an embodiment of the present disclosure is shown, as shown in FIG. Figure 3 As shown, it is assumed that the green electricity off-grid hydrogen production system is a wind power off-grid hydrogen production system, the power generation equipment 1 of the wind power off-grid hydrogen production system is a wind turbine, and its power supply power is wind power. The wind power P of the wind turbine at the current t-th time step is w (t) can be determined by formula (1); the electrolysis power range of the electrolyzer 2 of the wind power off-grid hydrogen production system is [P elz,min ,P elz,max ] is determined by the structural design of the electrolytic cell 2, the electrode material, the electrode spacing and other factors. The embodiment of the present disclosure has an electrolysis power range of [P elz,min ,P elz,max The specific value of ] is not limited; the minimum state of charge of the energy storage device 3 (such as a battery) of the wind power off-grid hydrogen production system is SOC min , the maximum state of charge is SOC max , the maximum discharge power is P disc,max , the maximum charging power is P c,max , which can be determined by the hardware performance (such as capacity, aging degree, etc.) of the energy storage device 3 itself. In the embodiment of the present disclosure, the minimum state of charge of the energy storage device 3 is SOC min , the maximum state of charge is SOC max , the maximum discharge power is P disc,max And the maximum charging power is P c,max There is no restriction on the specific value of .

[0090] like Figure 3 As shown, if the wind power P of the wind turbine at the current t-th time step is w (t), in the electrolysis power range of electrolytic cell 2 [P elz,min ,P elz,max ], the wind power P of the wind turbine w(t) can all be supplied to the electrolyzer 2. At the same time, in order to make the electrolyzer 2 produce as much hydrogen as possible, the energy storage device 3 can be used in conjunction with the wind turbine to jointly power the electrolyzer 2.

[0091] However, only when the state of charge of the energy storage device 3 is greater than the minimum state of charge SOC min The energy storage device 3 has the ability to supply power to the electrolyzer 2 only when t is reached. Therefore, the state of charge of the energy storage device 3 at the last time step (i.e., the t-1 time step) can be obtained as SOC(t-1), and it is determined whether the state of charge SOC(t-1) of the energy storage device 3 at the t-1 time step is greater than the minimum state of charge SOC min , and obtain the first judgment result. Among them, the state of charge SOC(t-1) of the energy storage device 3 at the t-1th time step can be obtained by the charging power P of the energy storage device 3 at the t-1th time step. c (t-1) or discharge power P disc (t-1), and the state of charge SOC(t-2) of the energy storage device 3 at the t-2th time step is determined.

[0092] If the first judgment result indicates that: SOC(t-1)≤SOC min , indicating that the energy storage device 3 has no ability to provide power for the electrolyzer 2. The wind power P of the wind turbine at the tth time step can be directly w (t) is determined as the electrolysis power P of electrolytic cell 2 at the tth time step elz (t), that is: P elz (t) = P w (t), and zero is determined as the discharge power P of the energy storage device 3 at the t-th time step disc (t) = 0; at this time, due to the wind power P of the wind turbine w (t) All the energy is supplied to the electrolytic cell 2, and the energy storage device 3 cannot be charged. The charging power P of the energy storage device 3 is c (t)=0.

[0093] If the first judgment result indicates that: SOC(t-1)>SOC min , indicating that the energy storage device 3 can provide power for the electrolyzer 2. Next, the wind power P of the wind turbine generator at the tth time step can be determined. w (t) and the maximum discharge power P of the energy storage device 3 disc,max The sum of the results P w (t)+P disc,max , is it greater than or equal to the upper limit P of electrolytic power of electrolytic cell 2? elz,max , and obtain the second judgment result.

[0094] If the second judgment result indicates that:w (t)+P disc,max ≥P elz,max , indicating that at the current t-th time step, the power provided by the wind turbine and the energy storage device 3 can reach or even exceed the upper limit of the electrolysis power of the electrolyzer 2 P elz,max Considering the excessive electrolysis power (for example, exceeding the electrolysis power upper limit P elz,max The power of electrolytic cell 2 will damage the electrolytic cell 2, and the electrolytic power upper limit P of electrolytic cell 2 can be set. elz,max Determined as the electrolysis power P of electrolytic cell 2 at the tth time step elz (t), that is: P elz (t) = P elz,max , and the electrolysis power upper limit P of electrolytic cell 2 elz,max The wind power P of the wind turbine at the tth time step w (t) is determined as the discharge power P of the energy storage device 3 at the tth time step. disc (t), that is: P disc (t) = P elz,max -P w (t), the discharge power P of the energy storage device 3 disc (t) is also the part of the electrolysis power provided by the energy storage device 3 to the electrolytic cell 2.

[0095] If the second judgment result indicates that: w (t)+P disc,max <P elz,max , indicating that at the current t-th time step, the power provided by the wind turbine and the energy storage device 3 cannot reach the upper limit P of the electrolysis power of the electrolyzer 2 elz,max , will not damage electrolyzer 2. In order to make electrolyzer 2 produce as much hydrogen as possible, the wind power P of the wind turbine generator at the tth time step can be w (t) and the maximum discharge power P of the energy storage device 3 disc,max The sum of the results P w (t)+P disc,max , determined as the electrolysis power P of electrolytic cell 2 at the tth time step elz (t), that is: P elz (t) = P w (t)+P disc,max , and the maximum discharge power P of the energy storage device 3 disc,max Determined as the discharge power P of energy storage device 3 at the tth time step disc (t), that is: P disc (t) = P disc,max .

[0096] In this way, the wind power P of the wind turbine generator can be adjusted according to different conditions (such as the state of charge SOC(t-1) of the energy storage device 3, w (t) and the power limits of electrolyzer 2 and energy storage device 3) to dynamically adjust the electrolysis power P of electrolyzer 2 elz (t) and the discharge power P of the energy storage device disc (t). This dynamic adjustment helps to optimize the energy distribution of the wind power off-grid hydrogen production system so that the safety of the wind power off-grid hydrogen production system is taken into account while meeting the electrolysis demand.

[0097] In a possible implementation, step S11 may include: when the power supply power is greater than the upper limit of the electrolysis power of the electrolytic cell 2, determining the upper limit of the electrolysis power of the electrolytic cell 2 as the electrolysis power of the electrolytic cell 2 at the t-th time step; judging whether the state of charge of the energy storage device 3 at the t-1th time step is greater than or equal to the maximum state of charge, and obtaining a third judgment result; when the third judgment result indicates that the state of charge of the energy storage device 3 at the t-1th time step is greater than or equal to the maximum state of charge, determining zero as the discharge power of the energy storage device 3 at the t-th time step; or, when the third judgment result indicates that the state of charge of the energy storage device 3 at the t-1th time step is less than the maximum state of charge, determining the minimum value of the difference between the power supply power of the power generation device 1 at the t-th time step and the upper limit of the electrolysis power of the electrolytic cell 2 and the maximum charging power of the energy storage device 3 as the charging power of the energy storage device 3 at the t-th time step.

[0098] In this way, when the power supply of the power generation equipment 1 exceeds the upper limit of the electrolysis power of the electrolytic cell 2, the electrolysis power of the electrolytic cell 2 can be set to the upper limit of the electrolysis power, so that the electrolytic cell 2 can operate at maximum efficiency, avoiding energy waste or equipment damage that may be caused by excessive power supply. Moreover, the charging power or discharging power of the energy storage device 3 will be dynamically adjusted according to the charge state of the energy storage device 3. When the energy storage device 3 is fully charged, it is not necessary to charge it unnecessarily, which is conducive to extending the life of the energy storage device 3. When the energy storage device 3 is not fully charged, the optimal charging power can be determined based on the remaining power supply of the power generation equipment 1 (for example, the difference between the power supply power of the power generation equipment 1 and the upper limit of the electrolysis power of the electrolytic cell 2) and the maximum charging power of the energy storage device 3, so as to reduce the probability of overheating or damage of the energy storage device 3 due to excessive charging power.

[0099] Figure 4 Another schematic diagram of determining the electrolytic power of the electrolytic cell and the electric power of the energy storage device according to an embodiment of the present disclosure is shown as follows: Figure 4As shown, it is assumed that the green electricity off-grid hydrogen production system is a wind power off-grid hydrogen production system, the power generation equipment 1 of the wind power off-grid hydrogen production system is a wind turbine, and its power supply power is wind power. The wind power P of the wind turbine at the current t-th time step is w (t) can be determined by formula (1); the electrolysis power range of the electrolyzer 2 of the wind power off-grid hydrogen production system is [P elz,min ,P elz,max ] is determined by the structural design of the electrolytic cell 2, the electrode material, the electrode spacing and other factors. The embodiment of the present disclosure has an electrolysis power range of [P elz,min ,P elz,max The specific value of ] is not limited; the minimum state of charge of the energy storage device 3 (such as a battery) of the wind power off-grid hydrogen production system is SOC min , the maximum state of charge is SOC max , the maximum discharge power is P disc,max , the maximum charging power is P c,max , which can be determined by the hardware performance (such as capacity, aging degree, etc.) of the energy storage device 3 itself. In the embodiment of the present disclosure, the minimum state of charge of the energy storage device 3 is SOC min , the maximum state of charge is SOC max , the maximum discharge power is P disc,max And the maximum charging power is P c,max There is no restriction on the specific value of .

[0100] like Figure 4 As shown, if the wind power P of the wind turbine at the current t-th time step is w (t) is greater than the upper limit P of electrolysis power of electrolytic cell 2 elz,max , that is: P w (t)>P elz,max , the electrolysis power upper limit P of electrolytic cell 2 can be elz,max Determined as the electrolysis power P of electrolytic cell 2 at the tth time step elz (t), that is: P elz (t) = P disc,max This means that even if more power is available for electrolyzer 2, electrolyzer 2 can only work at its maximum processing capacity. w (t)-P elz,max It can be used to charge the energy storage device 3.

[0101] In this case, it can be determined whether the state of charge SOC(t-1) of the energy storage device 3 at the t-1th time step is greater than or equal to the maximum state of charge SOC max, and obtain the third judgment result; wherein, the state of charge SOC(t-1) of the energy storage device 3 at the t-1 time step can be obtained by the charging power P of the energy storage device 3 at the t-1 time step c (t-1) or discharge power P disc (t-1), and the state of charge SOC(t-2) of the energy storage device 3 at the t-2th time step is determined.

[0102] If the third judgment result indicates that: SOC(t-1)≥SOC max , which means that the charge of energy storage device 3 is full and can no longer receive more power. The charging power P of energy storage device 3 is c (t) = 0, and, due to the wind power P of the wind turbine at the current t-th time step w (t) The demand of electrolytic cell 2 has been met, and the upper limit of electrolytic power P of electrolytic cell 2 has been reached. elz,max , the energy storage device 3 does not need to discharge, so the discharge power P of the energy storage device 3 at the tth time step disc (t) = P c (t)=0.

[0103] If the third judgment result indicates that: SOC(t-1)<SOC max , the energy storage device 3 has the capacity to receive more power, and the charging power P of the energy storage device 3 at the tth time step is c (t) = min{P c,max , P w (t)-P elz,max}, where P c,max represents the maximum charging power of energy storage device 3, P w (t) represents the wind power of the wind turbine at the current t-th time step, P elz,max It represents the upper limit of electrolysis power of electrolytic cell 2, and min{} represents the minimum function.

[0104] In a possible implementation, step S11 may include: when the power supply power is less than the lower limit of the electrolysis power of the electrolytic cell 2, determining whether the state of charge of the energy storage device 3 is less than the maximum state of charge at the t-1th time step, and obtaining a fourth determination result;

[0105] When the fourth judgment result indicates that the state of charge of the energy storage device 3 at the t-1th time step is less than the maximum state of charge, it is determined whether the sum of the power supply power of the power generation device 1 and the maximum discharge power of the energy storage device 3 at the tth time step is less than or equal to the lower limit of the electrolysis power of the electrolytic cell 2 to obtain a fifth judgment result;

[0106] When the fifth judgment result indicates that the sum of the power supply power of the power generation equipment 1 and the maximum discharge power of the energy storage device 3 at the tth time step is less than or equal to the lower limit of the electrolysis power of the electrolytic cell 2, 0 is determined as the electrolysis power of the electrolytic cell 2 at the tth time step, and the minimum value of the power supply power of the power generation equipment 1 and the maximum charging power of the energy storage device 3 at the tth time step is determined as the charging power of the energy storage device 3 at the tth time step.

[0107] In this way, when the energy storage device 3 is not fully charged, it can be determined whether the insufficient power supply can be supplemented by the discharge of the energy storage device 3 according to the power supply power of the power generation device 1 and the maximum discharge power of the energy storage device 3. If the total power of the energy storage device 3 after discharge is still insufficient to meet the needs of the electrolyzer 2, the electrolyzer 2 can be stopped and the energy storage device 3 will be charged to reserve energy for subsequent use. This strategy ensures the effective use of the energy storage device 3 and reduces energy waste.

[0108] Alternatively, when the fifth judgment result indicates that the sum of the power supply power of the power generation device 1 and the maximum discharge power of the energy storage device 3 at the t-th time step is greater than the lower limit of the electrolysis power of the electrolytic cell 2, it is determined whether the state of charge of the energy storage device 3 at the t-1th time step is greater than the minimum state of charge to obtain a sixth judgment result;

[0109] When the sixth judgment result indicates that the state of charge of the energy storage device 3 at the t-1th time step is greater than the minimum state of charge, the sum of the power supply power of the power generation device 1 at the tth time step and the maximum discharge power of the energy storage device 3 is determined as the electrolysis power of the electrolytic cell 2 at the tth time step, and the maximum discharge power of the energy storage device 3 is determined as the discharge power of the energy storage device 3 at the tth time step; or, when the sixth judgment result indicates that the state of charge of the energy storage device 3 at the t-1th time step is less than or equal to the minimum state of charge, zero is determined as the electrolysis power of the electrolytic cell 2 at the tth time step, and the minimum value between the power supply power of the power generation device 1 at the tth time step and the maximum charging power of the energy storage device 3 is determined as the charging power of the energy storage device 3 at the tth time step.

[0110] By monitoring the state of charge of the energy storage device 3, the probability of damage to the energy storage device 3 due to over-discharge can be reduced. When the state of charge of the energy storage device 3 is lower than the minimum state of charge, the discharge of the energy storage device 3 can be stopped, the electrolytic cell 2 can be stopped, and the energy storage device 3 can be charged instead, so as to protect the service life of the energy storage device 3 and reduce energy waste.

[0111] Optionally, when the fourth judgment result indicates that the state of charge of the energy storage device 3 at the t-1th time step is greater than or equal to the maximum state of charge, it is determined whether the sum of the power supply power of the power generation device 1 and the maximum discharge power of the energy storage device 3 at the tth time step is less than or equal to the lower limit of the electrolysis power of the electrolytic cell 2 to obtain a seventh judgment result;

[0112] When the seventh judgment result indicates that the sum of the power supply power of the power generation device 1 and the maximum discharge power of the energy storage device 3 at the t-th time step is less than or equal to the lower limit of the electrolysis power of the electrolyzer 2, zero is determined as the electrolysis power of the electrolyzer 2 at the t-th time step, and zero is determined as the charging power of the energy storage device 3 at the t-th time step; or, when the seventh judgment result indicates that the sum of the power supply power of the power generation device 1 and the maximum discharge power of the energy storage device 3 at the t-th time step is greater than the lower limit of the electrolysis power of the electrolyzer 2, the sum of the power supply power of the power generation device 1 and the maximum discharge power of the energy storage device 3 at t time steps is determined as the electrolysis power of the electrolyzer 2 at the t-th time step, and the maximum discharge power of the energy storage device 3 is determined as the discharge power of the energy storage device 3 at the t-th time step.

[0113] In this way, if the sum of the maximum discharge powers of the power generation device 1 and the energy storage device 3 cannot meet the power demand of the electrolyzer 2, the electrolyzer 2 can be stopped and the charging of the fully charged energy storage device 3 can be stopped at the same time, which can reduce the damage of the energy storage device 3 due to overcharging and extend the service life of the energy storage device 3. If the sum of the maximum discharge powers of the power generation device 1 and the energy storage device 3 can meet the power demand of the electrolyzer 2, the energy storage device 3 can be made to supply power to the electrolyzer 2 at the maximum discharge power so that the electrolyzer 2 can produce as much hydrogen as possible.

[0114] Figure 5 Another schematic diagram of determining the electrolytic power of the electrolytic cell and the electric power of the energy storage device according to an embodiment of the present disclosure is shown as follows: Figure 5 As shown, it is assumed that the green electricity off-grid hydrogen production system is a wind power off-grid hydrogen production system, the power generation equipment 1 of the wind power off-grid hydrogen production system is a wind turbine, and its power supply power is wind power. The wind power P of the wind turbine at the current t-th time step is w (t) can be determined by formula (1); the electrolysis power range of the electrolyzer 2 of the wind power off-grid hydrogen production system is [P elz,min ,P elz,max ] is determined by the structural design of the electrolytic cell 2, the electrode material, the electrode spacing and other factors. The embodiment of the present disclosure has an electrolysis power range of [P elz,min ,P elz,maxThe specific value of ] is not limited; the minimum state of charge of the energy storage device 3 (such as a battery) of the wind power off-grid hydrogen production system is SOC min , the maximum state of charge is SOC max , the maximum discharge power is P disc,max , the maximum charging power is P c,max , which can be determined by the hardware performance (such as capacity, aging degree, etc.) of the energy storage device 3 itself. In the embodiment of the present disclosure, the minimum state of charge of the energy storage device 3 is SOC min , the maximum state of charge is SOC max , the maximum discharge power is P disc,max And the maximum charging power is P c,max There is no restriction on the specific value of .

[0115] like Figure 5 As shown, if the wind power P of the wind turbine at the current t-th time step is w (t) is less than the lower limit P of electrolysis power of electrolytic cell 2 elz,min , that is: P w (t)<P elz,max , which means the wind power P provided by the wind turbine w (t) It is impossible to drive the electrolytic cell 2 to work alone. In order to make the electrolytic cell 2 work normally, the state of charge of the energy storage device 3 also needs to be considered. It can be determined whether the state of charge SOC(t-1) of the energy storage device 3 is less than the maximum state of charge SOC at the t-1th time step. max , and obtain the fourth judgment result;

[0116] If the fourth judgment result indicates that: SOC(t-1)<SOC max , indicating that the energy storage device 3 is not fully charged, and the wind power P of the wind turbine generator at the tth time step can be determined. w (t) and the maximum discharge power P of the energy storage device 3 disc,max The sum of the results P w (t)+P disc,max , is it less than or equal to the lower limit P of electrolytic power of electrolytic cell 2? elz,min , and obtain the fifth judgment result;

[0117] If the fifth judgment result indicates that: w (t)+P disc,max ≤P elz,min , indicating that even if the wind turbine and the energy storage device 3 jointly power the electrolyzer 2, they cannot drive the electrolyzer 2 to work. At this time, the electrolyzer 2 can be stopped. The electrolysis power P of the electrolyzer 2 at the tth time step is elz (t) = 0, and the wind power P of the wind turbine generator at the tth time step w(t) supplies energy storage device 3 with charging power P of energy storage device 3 at the tth time step c (t) = min{P w (t), P c,max}, where P c,max represents the maximum charging power of energy storage device 3, P w (t) represents the wind power of the wind turbine at the current t-th time step, and min{} represents the minimum function. w (t) and maximum charging power P c,max The minimum value of c (t), which can reduce the overcharging operation on the energy storage device 3, and is beneficial to prolonging the service life of the energy storage device 3.

[0118] If the fifth judgment result indicates: P w (t)+P disc,max >P elz,min , indicating that the wind turbine and the energy storage device 3 jointly power the electrolyzer 2 and can drive the electrolyzer 2 to work. However, in order to reduce the probability of over-discharge of the energy storage device 3, it is possible to continue to determine whether the state of charge SOC(t-1) of the energy storage device 3 at the t-1th time step is greater than the minimum state of charge SOC min , and obtain the sixth judgment result;

[0119] If the sixth judgment result indicates that: SOC(t-1)>SOC min , indicating that the energy storage device 3 will not be over-discharged, and the energy storage device 3 can cooperate with the wind turbine to provide power for the electrolyzer 2, and the wind power P of the wind turbine at the tth time step can be w (t) and the maximum discharge power P of the energy storage device 3 disc,max The sum of the results P w (t)+P disc,max , determined as the electrolysis power P of electrolytic cell 2 at the tth time step elz (t) = P w (t)+P disc,max , and the maximum discharge power P of the energy storage device 3 disc,max Determine the discharge power P of energy storage device 3 at the tth time step disc (t), that is: P disc (t) = P disc,max ;

[0120] If the sixth judgment result indicates that: SOC(t-1)≤SOC min, indicating that the energy storage device 3 will be over-discharged, and the energy storage device 3 cannot cooperate with the wind turbine to provide power for the electrolyzer 2. The electrolyzer 2 stops working. The electrolysis power P of the electrolyzer 2 at the tth time step is elz (t) = 0, and the wind power P of the wind turbine generator at the tth time step w (t) supplies energy storage device 3 with charging power P of energy storage device 3 at the tth time step c (t) = min{P w (t), P c,max}, where P c,max represents the maximum charging power of energy storage device 3, P w (t) represents the wind power of the wind turbine at the current t-th time step, and min{} represents the minimum function. w (t) and maximum charging power P c,max The minimum value of c (t), which can reduce the overcharging operation on the energy storage device 3, and is beneficial to prolonging the service life of the energy storage device 3.

[0121] Optionally, if the fourth judgment result indicates that: SOC(t-1)≥SOC max , indicating that the energy storage device 3 is fully charged, and the wind power P of the wind turbine generator at the tth time step can be further determined. w (t) and the maximum discharge power P of the energy storage device 3 disc,max The sum of the results P w (t)+P disc,max , is it less than or equal to the lower limit P of electrolysis power of electrolytic cell 2? elz,min , and obtain the seventh judgment result;

[0122] If the seventh judgment result indicates that: w (t)+P disc,max ≤P elz,min , indicating that even if the wind turbine and the energy storage device 3 jointly power the electrolyzer 2, they cannot drive the electrolyzer 2 to work. At this time, the electrolyzer 2 can be stopped. The electrolysis power P of the electrolyzer 2 at the tth time step is elz (t) = 0. Since the energy storage device 3 is also fully charged, the charging power P of the energy storage device 3 at the tth time step can be c (t) = 0; it should be understood that since the energy storage device 3 does not supply power to the electrolytic cell 2, the discharge power P of the energy storage device 3 disc (t) is also 0.

[0123] Or, if the seventh judgment result indicates: P w (t)+P disc,max >Pelz,min , indicating that the wind turbine and the energy storage device 3 jointly supply power to the electrolyzer 2, which can drive the electrolyzer 2 to work, and the wind power P of the wind turbine at the tth time step can be w (t) and the maximum discharge power P of the energy storage device 3 disc,max The sum of the results P w (t)+P disc,max , determined as the electrolysis power P of electrolytic cell 2 at the tth time step elz (t) = P w (t)+P disc,max , and the maximum discharge power P of the energy storage device 3 disc,max Determine the discharge power P of energy storage device 3 at the tth time step disc (t), that is: P disc (t) = P disc,max .

[0124] It can be seen that the evaluation method of the embodiment of the present disclosure, during the evaluation process, will w (t) When the output is insufficient, the electrolyzer 2 is shut down and the wind power P w When (t) is large enough, the electrolyzer 2 is restarted to produce hydrogen, which can be based on the wind power P w (t) can be used to adjust the production rhythm according to the real-time changes in the wind power, thereby reducing operating costs and improving economic benefits. For example, it can be determined how wind energy is allocated between charging the energy storage device 3, charging the electrolyzer 2, and power restriction, and whether to charge or discharge the energy storage device 3 according to different conditions. w (t) In the electrolysis power range [P elz,min ,P elz,max ], combined with the monitoring of the state of charge SOC(t-1) of the energy storage device 3, it is determined whether the energy storage device 3 has the discharge capacity at the tth time step, thereby determining the electrolysis power P of the electrolytic cell 2. elz (t) whether it is supplied by the wind turbine and the energy storage device 3 together, or only by the wind turbine; if the wind power P of the wind turbine w (t) is greater than the upper limit of electrolysis power P elz,max , then electrolyzer 2 operates at the electrolysis power upper limit P elz,max At the same time, the state of charge SOC(t-1) of the energy storage device 3 must also be detected to determine whether the energy storage device 3 is allowed to charge at this time step; if the wind power P w (t) is less than the lower limit of electrolysis power P elz,minIt is also necessary to combine the monitoring of the charge state SOC(t-1) of the energy storage device 3 to determine whether the energy storage device 3 has the charging or discharging capability at the tth time step, so as to decide whether the wind power off-grid hydrogen production system should be shut down, or the electrolyzer 2 should be shut down and the energy storage device 3 should be charged, or the wind turbine and the energy storage device 3 should jointly supply power to the electrolyzer 2 for operation.

[0125] Figure 6 A schematic diagram showing a curve of wind power and electrolysis power according to an embodiment of the present disclosure is shown in FIG. Figure 6 As shown in the figure, the preset time range is one year, each time step is 15 minutes, the horizontal axis represents the number of time steps, and the vertical axis represents power, in units of per unit (pu). Among them, the red curve represents the electrolysis power P elz (t), the blue curve represents the wind power P w (t). Figure 6 The curve graph shown can more intuitively obtain the annual wind power output and the electrolysis power of the electrolytic cell 2.

[0126] Figure 7 A schematic diagram showing the hydrogen production according to an embodiment of the present disclosure is shown in FIG. Figure 7 As shown, the preset time range is one year, each time step is 15 minutes, the horizontal axis represents the number of time steps, and the vertical axis represents the hydrogen production The unit is kilograms per minute (kg / min). I will not go into details here. Figure 7 The curve chart shown can provide a more intuitive picture of the annual hydrogen production.

[0127] Figure 8 A schematic diagram showing a state of charge curve according to an embodiment of the present disclosure is shown in FIG. Figure 8 As shown, the preset time range is one year, each time step is 15 minutes, the horizontal axis represents the number of time steps, and the vertical axis represents the state of charge SOC(t), in %. Figure 8 The curve graph shown can more intuitively show the output of the energy storage device 3.

[0128] It should be understood that the hydrogen production per minute produced by the electrolyzer 2 is As for the state of charge SOC(t) of the energy storage device 3, please refer to the above step S12, which will not be repeated here.

[0129] In one possible implementation, after determining the total hydrogen production based on the sum of the hydrogen production of T time steps within a preset time range, the method further includes: determining the levelized cost of hydrogen based on the ratio of the sum of the capital cost and the operating cost of the wind power off-grid hydrogen production system within the preset time range to the total hydrogen production.

[0130] For example, the levelized cost of hydrogen production (LCOH) may be used to measure the cost of hydrogen production. The levelized cost of hydrogen production may be defined as the ratio of annual capital cost and annual operating cost (eg, including fixed and variable parts) to the total hydrogen production within a preset time frame (eg, one year).

[0131]

[0132] Among them, the subscript i represents the set of devices involved, crf i represents the relevant capital recovery rate, which can convert the investment cost into annuity, and depends on the discount rate r and the equipment life T i , of the following form:

[0133]

[0134] CAPEX i is the capital cost of equipment i, represents the fixed cost of equipment i, represents the variable operating cost of equipment i. is the hydrogen production per minute at the t-th time step, △t represents the length of the time step (e.g. 15 minutes), and the preset time range may include T time steps. In practical applications, the wind power off-grid hydrogen production system as a whole can be regarded as owned by a certain user, and the fixed cost CAPEX and variable operating cost OPEX should include all components in the wind power off-grid hydrogen production system.

[0135] For example, refer to Figure 6 to Figure 8 It can be seen that the equivalent annual utilization hours of wind power are 2911. Without considering the cost of hydrogen storage and transportation to downstream hydrogen users, the calculated levelized hydrogen production cost is 15.86 yuan / kg.

[0136] Compared with the calculation of life cycle-based costs and production, the economic evaluation model of the embodiment of the present disclosure can be established within a shorter time frame (for example, the preset time frame is an annual range), can fully consider the operational details, and obtain more accurate results.

[0137] Fig. 9 FIG. 2 is a block diagram of an evaluation device according to an embodiment of the present disclosure. Fig. 9 As shown, the device is used to evaluate the total hydrogen production of a green electricity off-grid hydrogen production system within a preset time range, the green electricity off-grid hydrogen production system includes a power generation device, an electrolyzer and an energy storage device, the preset time range includes T time steps, T is an integer greater than 1, and the device includes:

[0138] The first determination module 91 is used to determine the electrolysis power of the electrolyzer and the electric power of the energy storage device at the t-th time step according to the power supply power of the power generation device at the t-1th time step, the charge state of the energy storage device at the t-1th time step, and the equipment parameters of the green electricity off-grid hydrogen production system, wherein the electric power includes charging power and discharging power, and t is any integer from 1 to T;

[0139] A second determination module 92 is used to determine the state of charge of the energy storage device at the t-th time step according to the electric power of the energy storage device at the t-th time step and the state of charge of the energy storage device at the t-1-th time step, and to determine the hydrogen production at the t-th time step according to the electrolysis power of the electrolyzer at the t-th time step;

[0140] The third determination module 93 is used to determine the total hydrogen production according to the sum of the hydrogen production of T time steps within a preset time range.

[0141] In a possible implementation, the device parameters include the minimum state of charge and the maximum discharge power of the energy storage device, and the electrolysis power range of the electrolytic cell. The first determination module 91 is used to: when the power supply power is within the electrolysis power range of the electrolytic cell, determine whether the state of charge of the energy storage device is greater than the minimum state of charge at the t-1th time step to obtain a first judgment result; when the first judgment result indicates that the state of charge of the energy storage device is greater than the minimum state of charge at the t-1th time step, determine whether the power supply power of the power generation device at the tth time step is within the electrolysis power range of the electrolytic cell. A second judgment result is obtained by determining whether the sum of the maximum discharge power of the energy storage device is greater than or equal to the upper limit of the electrolysis power of the electrolytic cell; when the second judgment result indicates that the sum of the power supply power of the power generation device and the maximum discharge power of the energy storage device at the t-th time step is greater than or equal to the upper limit of the electrolysis power of the electrolytic cell, the upper limit of the electrolysis power of the electrolytic cell is determined as the electrolysis power of the electrolytic cell at the t-th time step, and the difference between the upper limit of the electrolysis power of the electrolytic cell and the power supply power of the power generation device at the t-th time step is determined as the discharge power of the energy storage device at the t-th time step.

[0142] In a possible implementation, the first determination module 91 is further used for: when the first judgment result indicates that the state of charge of the energy storage device at the t-1th time step is less than or equal to the minimum state of charge, determining the power supply power of the power generation device at the tth time step as the electrolysis power of the electrolytic cell at the tth time step, and determining zero as the discharge power of the energy storage device at the tth time step; when the second judgment result indicates that the sum of the power supply power of the power generation device at the tth time step and the maximum discharge power of the energy storage device is less than the upper limit of the electrolysis power of the electrolytic cell, determining the sum of the power supply power of the power generation device at the tth time step and the maximum discharge power of the energy storage device as the electrolysis power of the electrolytic cell at the tth time step, and determining the maximum discharge power of the energy storage device as the discharge power of the energy storage device at the tth time step.

[0143] In a possible implementation, the device parameters include the maximum state of charge and the maximum charging power of the energy storage device, and the electrolysis power range of the electrolytic cell. The first determination module 91 is used to: when the power supply power is greater than the upper limit of the electrolysis power of the electrolytic cell, determine the upper limit of the electrolysis power of the electrolytic cell as the electrolysis power of the electrolytic cell at the t-th time step; determine whether the state of charge of the energy storage device is greater than or equal to the maximum state of charge at the t-1th time step, and obtain a third judgment result; when the third judgment result indicates that the state of charge of the energy storage device at the t-1th time step is greater than or equal to the maximum state of charge, determine zero as the discharge power of the energy storage device at the t-th time step; or, when the third judgment result indicates that the state of charge of the energy storage device at the t-1th time step is less than the maximum state of charge, determine the minimum value of the difference between the power supply power of the power generation device at the t-th time step and the upper limit of the electrolysis power of the electrolytic cell and the maximum charging power of the energy storage device as the charging power of the energy storage device at the t-th time step.

[0144] In a possible implementation, the device parameters include the maximum state of charge, maximum discharge power, maximum charging power of the energy storage device, and the electrolysis power range of the electrolytic cell. The first determination module 91 is used to: when the power supply power is less than the lower limit of the electrolysis power of the electrolytic cell, determine whether the state of charge of the energy storage device is less than the maximum state of charge at the t-1th time step to obtain a fourth judgment result; when the fourth judgment result indicates that the state of charge of the energy storage device is less than the maximum state of charge at the t-1th time step, determine the power supply of the power generation device at the tth time step. A fifth judgment result is obtained by determining whether the sum of the power supply power of the power generation device and the maximum discharge power of the energy storage device is less than or equal to the lower limit of the electrolysis power of the electrolytic cell; when the fifth judgment result indicates that the sum of the power supply power of the power generation device and the maximum discharge power of the energy storage device at the t-th time step is less than or equal to the lower limit of the electrolysis power of the electrolytic cell, 0 is determined as the electrolysis power of the electrolytic cell at the t-th time step, and the minimum value of the power supply power of the power generation device and the maximum charging power of the energy storage device at the t-th time step is determined as the charging power of the energy storage device at the t-th time step.

[0145] In a possible implementation, the device parameters include the minimum state of charge of the energy storage device, and the first determination module 91 is further used to: when the fifth judgment result indicates that the sum of the power supply power of the power generation device and the maximum discharge power of the energy storage device at the t-th time step is greater than the lower limit of the electrolysis power of the electrolytic cell, determine whether the charge state of the energy storage device at the t-1th time step is greater than the minimum state of charge, and obtain a sixth judgment result; when the sixth judgment result indicates that the charge state of the energy storage device at the t-1th time step is greater than the minimum state of charge, the power supply power of the power generation device at the t-th time step is greater than the minimum state of charge. The sum of the rate and the maximum discharge power of the energy storage device is determined as the electrolysis power of the electrolytic cell at the t-th time step, and the maximum discharge power of the energy storage device is determined as the discharge power of the energy storage device at the t-th time step; or, when the sixth judgment result indicates that the state of charge of the energy storage device at the t-1th time step is less than or equal to the minimum state of charge, zero is determined as the electrolysis power of the electrolytic cell at the t-th time step, and the minimum value between the power supply power of the power generation device at the t-1th time step and the maximum charging power of the energy storage device is determined as the charging power of the energy storage device at the t-th time step.

[0146] In a possible implementation, the first determination module 91 is further used to: when the fourth judgment result indicates that the state of charge of the energy storage device at the t-1th time step is greater than or equal to the maximum state of charge, determine whether the sum of the power supply power of the power generation device and the maximum discharge power of the energy storage device at the tth time step is less than or equal to the lower limit of the electrolysis power of the electrolytic cell, and obtain a seventh judgment result; when the seventh judgment result indicates that the sum of the power supply power of the power generation device and the maximum discharge power of the energy storage device at the tth time step is less than or equal to the lower limit of the electrolysis power of the electrolytic cell, determine zero. is the electrolysis power of the electrolytic cell at the t-th time step, and zero is determined as the charging power of the energy storage device at the t-th time step; or, when the seventh judgment result indicates that the sum of the power supply power of the power generation device and the maximum discharge power of the energy storage device at the t-th time step is greater than the lower limit of the electrolysis power of the electrolytic cell, the sum of the power supply power of the power generation device and the maximum discharge power of the energy storage device at t time steps is determined as the electrolysis power of the electrolytic cell at the t-th time step, and the maximum discharge power of the energy storage device is determined as the discharge power of the energy storage device at the t-th time step.

[0147] In one possible implementation, the green electricity off-grid hydrogen production system includes a wind power off-grid hydrogen production system, the power generation equipment includes a wind turbine, the power supply power includes wind power, and the first determination module 91 is used to: obtain wind speed data at the tth time step; input the wind speed data at the tth time step into a preset wind power generation model to obtain the wind power of the wind turbine at the tth time step; after determining the total hydrogen production based on the sum of the hydrogen production of T time steps within a preset time range, the device also includes a fourth determination module, which is used to: determine the levelized cost of hydrogen based on the ratio of the sum of the capital cost and the operating cost of the wind power off-grid hydrogen production system within the preset time range to the total hydrogen production.

[0148] In some embodiments, the functions or modules included in the device provided by the embodiments of the present disclosure can be used to execute the method described in the above method embodiments. The specific implementation can refer to the description of the above method embodiments, and for the sake of brevity, it will not be repeated here.

[0149] The embodiment of the present disclosure also provides a computer-readable storage medium on which computer program instructions are stored, and the computer program instructions implement the above method when executed by a processor. The computer-readable storage medium can be a volatile or non-volatile computer-readable storage medium.

[0150] An embodiment of the present disclosure further proposes an electronic device, comprising: a processor; and a memory for storing instructions executable by the processor; wherein the processor is configured to implement the above method when executing the instructions stored in the memory.

[0151] The embodiments of the present disclosure also provide a computer program product, including a computer-readable code, or a non-volatile computer-readable storage medium carrying the computer-readable code. When the computer-readable code runs in a processor of an electronic device, the processor in the electronic device executes the above method.

[0152] Fig.10 1 is a block diagram of an electronic device 1900 according to an exemplary embodiment. For example, the electronic device 1900 may be provided as a server or a terminal device. Fig.10 , the electronic device 1900 includes a processing component 1922, which further includes one or more processors, and a memory resource represented by a memory 1932 for storing instructions executable by the processing component 1922, such as an application. The application stored in the memory 1932 may include one or more modules, each corresponding to a set of instructions. In addition, the processing component 1922 is configured to execute instructions to perform the above method.

[0153] The electronic device 1900 may also include a power supply component 1926 configured to perform power management of the electronic device 1900, a wired or wireless network interface 1950 configured to connect the electronic device 1900 to a network, and an input / output interface 1958 (I / O interface). The electronic device 1900 may operate based on an operating system stored in the memory 1932, such as Windows Server 2003. TM , Mac OS X TM , Unix TM ,Linux TM , FreeBSD TM or similar.

[0154] In an exemplary embodiment, a non-volatile computer-readable storage medium is also provided, such as a memory 1932 including computer program instructions, which can be executed by the processing component 1922 of the electronic device 1900 to perform the above method.

[0155] The present disclosure may be a system, a method and / or a computer program product. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for causing a processor to implement various aspects of the present disclosure.

[0156] Computer readable storage medium can be a tangible device that can hold and store instructions used by an instruction execution device. Computer readable storage medium can be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination thereof. More specific examples (non-exhaustive list) of computer readable storage medium include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disk read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanical encoding device, for example, a punch card or a convex structure in a groove on which instructions are stored, and any suitable combination thereof. The computer readable storage medium used here is not interpreted as a transient signal itself, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagated by a waveguide or other transmission medium (for example, a light pulse by an optical fiber cable), or an electrical signal transmitted by a wire.

[0157] The computer-readable program instructions described herein can be downloaded from a computer-readable storage medium to each computing / processing device, or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network can include copper transmission cables, optical fiber transmissions, wireless transmissions, routers, firewalls, switches, gateway computers, and / or edge servers. The network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in the computer-readable storage medium in each computing / processing device.

[0158] The computer program instructions for performing the operation of the present disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages, such as Smalltalk, C++, etc., and conventional procedural programming languages, such as "C" language or similar programming languages. Computer-readable program instructions may be executed completely on a user's computer, partially on a user's computer, as an independent software package, partially on a user's computer, partially on a remote computer, or completely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., using an Internet service provider to connect via the Internet). In some embodiments, an electronic circuit, such as a programmable logic circuit, a field programmable gate array (FPGA), or a programmable logic array (PLA), may be customized by utilizing the state information of the computer-readable program instructions, and the electronic circuit may execute the computer-readable program instructions, thereby realizing various aspects of the present disclosure.

[0159] Various aspects of the present disclosure are described herein with reference to the flowcharts and / or block diagrams of the methods, devices (systems) and computer program products according to the embodiments of the present disclosure. It should be understood that each box in the flowchart and / or block diagram and the combination of each box in the flowchart and / or block diagram can be implemented by computer-readable program instructions.

[0160] These computer-readable program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, thereby producing a machine, so that when these instructions are executed by the processor of the computer or other programmable data processing device, a device that implements the functions / actions specified in one or more boxes in the flowchart and / or block diagram is generated. These computer-readable program instructions can also be stored in a computer-readable storage medium, and these instructions cause the computer, programmable data processing device, and / or other equipment to work in a specific manner, so that the computer-readable medium storing the instructions includes a manufactured product, which includes instructions for implementing various aspects of the functions / actions specified in one or more boxes in the flowchart and / or block diagram.

[0161] Computer-readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other device so that a series of operating steps are performed on the computer, other programmable data processing apparatus, or other device to produce a computer-implemented process, thereby causing the instructions executed on the computer, other programmable data processing apparatus, or other device to implement the functions / actions specified in one or more boxes in the flowchart and / or block diagram.

[0162] The flow chart and block diagram in the accompanying drawings show the possible architecture, function and operation of the system, method and computer program product according to multiple embodiments of the present disclosure. In this regard, each square box in the flow chart or block diagram can represent a part of a module, program segment or instruction, and a part of the module, program segment or instruction includes one or more executable instructions for realizing the specified logical function. In some alternative implementations, the function marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two continuous square boxes can actually be executed substantially in parallel, and they can sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs the specified function or action, or can be implemented with a combination of special hardware and computer instructions.

[0163] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. An evaluation method, characterized in that: The method is used to evaluate the total hydrogen production of a green electricity off-grid hydrogen production system within a preset time range, wherein the green electricity off-grid hydrogen production system includes a power generation device, an electrolyzer, and an energy storage device, wherein the preset time range includes T time steps, where T is an integer greater than 1, and the method includes: According to the power supply power of the power generation equipment at the t-th time step, the charge state of the energy storage equipment at the t-1th time step, and the equipment parameters of the green electricity off-grid hydrogen production system, the electrolysis power of the electrolyzer and the electric power of the energy storage equipment at the t-th time step are determined, wherein the electric power includes the charging power and the discharging power, and t is any integer from 1 to T; Determine the state of charge of the energy storage device at the t-th time step according to the electric power of the energy storage device at the t-th time step and the state of charge of the energy storage device at the t-1-th time step, and Determining the hydrogen production at the t-th time step according to the electrolysis power of the electrolyzer at the t-th time step; The total hydrogen production is determined based on the sum of the hydrogen production of T time steps within the preset time range.

2. The method according to claim 1, characterized in that The equipment parameters include the minimum state of charge and maximum discharge power of the energy storage device, the electrolysis power range of the electrolytic cell, According to the power supply power of the power generation equipment at the t-th time step, the charge state of the energy storage equipment at the t-1th time step, and the equipment parameters of the green electricity off-grid hydrogen production system, the electrolysis power of the electrolyzer and the electric power of the energy storage equipment at the t-th time step are determined, including: When the power supply power is within the electrolysis power range of the electrolytic cell, determining whether the state of charge of the energy storage device is greater than the minimum state of charge at the t-1th time step to obtain a first determination result; When the first judgment result indicates that the state of charge of the energy storage device at the t-1th time step is greater than the minimum state of charge, determine whether the sum of the power supply power of the power generation device and the maximum discharge power of the energy storage device at the tth time step is greater than or equal to the upper limit of the electrolysis power of the electrolytic cell to obtain a second judgment result; When the second judgment result indicates that the sum of the power supply power of the power generation equipment and the maximum discharge power of the energy storage equipment at the t-th time step is greater than or equal to the upper limit of the electrolysis power of the electrolytic cell, the upper limit of the electrolysis power of the electrolytic cell is determined as the electrolysis power of the electrolytic cell at the t-th time step, and the difference between the upper limit of the electrolysis power of the electrolytic cell and the power supply power of the power generation equipment at the t-th time step is determined as the discharge power of the energy storage device at the t-th time step.

3. The method according to claim 2, characterized in that The method further includes: when the first judgment result indicates that the state of charge of the energy storage device at the t-1th time step is less than or equal to the minimum state of charge, determining the power supply power of the power generation device at the tth time step as the electrolysis power of the electrolytic cell at the tth time step, and determining zero as the discharge power of the energy storage device at the tth time step; When the second judgment result indicates that the sum of the power supply power of the power generation equipment and the maximum discharge power of the energy storage equipment at the t-th time step is less than the upper limit of the electrolysis power of the electrolytic cell, the sum of the power supply power of the power generation equipment and the maximum discharge power of the energy storage equipment at the t-th time step is determined as the electrolysis power of the electrolytic cell at the t-th time step, and the maximum discharge power of the energy storage equipment is determined as the discharge power of the energy storage equipment at the t-th time step.

4. The method according to claim 1, characterized in that The equipment parameters include the maximum state of charge and maximum charging power of the energy storage device, the electrolysis power range of the electrolytic cell, According to the power supply power of the power generation equipment at the t-th time step, the charge state of the energy storage equipment at the t-1th time step, and the equipment parameters of the green electricity off-grid hydrogen production system, the electrolysis power of the electrolyzer and the electric power of the energy storage equipment at the t-th time step are determined, including: When the power supply power is greater than the upper limit of the electrolysis power of the electrolytic cell, the upper limit of the electrolysis power of the electrolytic cell is determined as the electrolysis power of the electrolytic cell at the t-th time step; Determine whether the state of charge of the energy storage device at the t-1th time step is greater than or equal to the maximum state of charge, and obtain a third determination result; When the third judgment result indicates that the state of charge of the energy storage device at the t-1th time step is greater than or equal to the maximum state of charge, zero is determined as the discharge power of the energy storage device at the tth time step; or When the third judgment result indicates that the state of charge of the energy storage device at the t-1th time step is less than the maximum state of charge, the minimum value of the difference between the power supply power of the power generation equipment at the tth time step and the upper limit of the electrolysis power of the electrolytic cell and the maximum charging power of the energy storage device is determined as the charging power of the energy storage device at the tth time step.

5. The method according to claim 1, characterized in that The equipment parameters include the maximum state of charge, maximum discharge power, maximum charge power of the energy storage device, and the electrolysis power range of the electrolytic cell. According to the power supply power of the power generation equipment at the t-th time step, the charge state of the energy storage equipment at the t-1th time step, and the equipment parameters of the green electricity off-grid hydrogen production system, the electrolysis power of the electrolyzer and the electric power of the energy storage equipment at the t-th time step are determined, including: When the power supply power is less than the lower limit of the electrolysis power of the electrolytic cell, determining whether the state of charge of the energy storage device is less than the maximum state of charge at the t-1th time step, and obtaining a fourth determination result; When the fourth judgment result indicates that the state of charge of the energy storage device at the t-1th time step is less than the maximum state of charge, determine whether the sum of the power supply power of the power generation device and the maximum discharge power of the energy storage device at the tth time step is less than or equal to the lower limit of the electrolysis power of the electrolytic cell to obtain a fifth judgment result; When the fifth judgment result indicates that the sum of the power supply power of the power generation equipment and the maximum discharge power of the energy storage equipment at the tth time step is less than or equal to the lower limit of the electrolysis power of the electrolytic cell, 0 is determined as the electrolysis power of the electrolytic cell at the tth time step, and the minimum value of the power supply power of the power generation equipment and the maximum charging power of the energy storage equipment at the tth time step is determined as the charging power of the energy storage device at the tth time step.

6. The method according to claim 5, characterized in that The device parameters include a minimum state of charge of the energy storage device, and the method further includes: When the fifth judgment result indicates that the sum of the power supply power of the power generation device and the maximum discharge power of the energy storage device at the t-th time step is greater than the lower limit of the electrolysis power of the electrolytic cell, determine whether the state of charge of the energy storage device at the t-1th time step is greater than the minimum state of charge to obtain a sixth judgment result; When the sixth judgment result indicates that the state of charge of the energy storage device at the t-1th time step is greater than the minimum state of charge, the sum of the power supply power of the power generation device at the tth time step and the maximum discharge power of the energy storage device is determined as the electrolysis power of the electrolytic cell at the tth time step, and the maximum discharge power of the energy storage device is determined as the discharge power of the energy storage device at the tth time step; or, When the sixth judgment result indicates that the state of charge of the energy storage device at the t-1th time step is less than or equal to the minimum state of charge, zero is determined as the electrolysis power of the electrolytic cell at the tth time step, and the minimum value between the power supply power of the power generation device at the tth time step and the maximum charging power of the energy storage device is determined as the charging power of the energy storage device at the tth time step.

7. The method according to claim 5, characterized in that The method further includes: when the fourth judgment result indicates that the state of charge of the energy storage device at the t-1th time step is greater than or equal to the maximum state of charge, judging whether the sum of the power supply power of the power generation device and the maximum discharge power of the energy storage device at the tth time step is less than or equal to the lower limit of the electrolysis power of the electrolytic cell, to obtain a seventh judgment result; In the case where the seventh judgment result indicates that the sum of the power supply power of the power generation device and the maximum discharge power of the energy storage device at the t-th time step is less than or equal to the lower limit of the electrolysis power of the electrolytic cell, zero is determined as the electrolysis power of the electrolytic cell at the t-th time step, and zero is determined as the charging power of the energy storage device at the t-th time step; or, When the seventh judgment result indicates that the sum of the power supply power of the power generation equipment and the maximum discharge power of the energy storage equipment at the t-th time step is greater than the lower limit of the electrolysis power of the electrolytic cell, the sum of the power supply power of the power generation equipment and the maximum discharge power of the energy storage equipment at t time steps is determined as the electrolysis power of the electrolytic cell at the t-th time step, and the maximum discharge power of the energy storage equipment is determined as the discharge power of the energy storage equipment at the t-th time step.

8. The method according to any one of claims 1 to 7, characterized in that: The green electricity off-grid hydrogen production system includes a wind power off-grid hydrogen production system, the power generation equipment includes a wind turbine generator, and the power supply includes wind power. Obtaining the power supply power of the power generation equipment at the tth time step, including: Get the wind speed data at the tth time step; Input the wind speed data at the t-th time step into a preset wind power generation model to obtain the wind power of the wind turbine at the t-th time step; After determining the total hydrogen production according to the sum of the hydrogen production of T time steps within the preset time range, the method further includes: The levelized cost of hydrogen is determined based on the ratio of the sum of the capital cost and the operating cost of the wind power off-grid hydrogen production system within a preset time range to the total hydrogen production.

9. An evaluation device, characterized in that The device is used to evaluate the total hydrogen production of a green electricity off-grid hydrogen production system within a preset time range, the green electricity off-grid hydrogen production system includes a power generation device, an electrolyzer and an energy storage device, the preset time range includes T time steps, T is an integer greater than 1, and the device includes: A first determination module is used to determine the electrolysis power of the electrolyzer and the electric power of the energy storage device at the t-th time step according to the power supply power of the power generation equipment at the t-1th time step, the charge state of the energy storage device at the t-1th time step, and the equipment parameters of the green electricity off-grid hydrogen production system, wherein the electric power includes charging power and discharging power, and t is any integer from 1 to T; A second determination module is used to determine the state of charge of the energy storage device at the t-th time step according to the electric power of the energy storage device at the t-th time step and the state of charge of the energy storage device at the t-1-th time step, and determine the hydrogen production at the t-th time step according to the electrolysis power of the electrolyzer at the t-th time step; The third determination module is used to determine the total hydrogen production according to the sum of the hydrogen production of T time steps within a preset time range.

10. An electronic device, characterized in that: include: processor; a memory for storing processor-executable instructions; The processor is configured to implement the method described in any one of claims 1 to 8 when executing the instructions stored in the memory.

11. A non-volatile computer-readable storage medium having computer program instructions stored thereon, characterized in that: When the computer program instructions are executed by a processor, the method according to any one of claims 1 to 8 is implemented.

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