Evaluation method and device for green electricity off-grid hydrogen production system

Abstract

The present disclosure relates to an evaluation method and device for a green electricity off-grid hydrogen production system, comprising: determining 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-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; determining the charge state 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 charge state of the energy storage device at the t-1th 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; determining the total hydrogen production according to the sum of the hydrogen production of T time steps within a preset time range. In this way, the hydrogen production of each time step can be accurately calculated, which is helpful to formulate a reasonable production plan.

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 (including wind power, for example) to address the issue of renewable energy consumption within the power system will drive the transition of energy-intensive, high-emission sectors like transportation and industry toward green, low-carbon energy. Therefore, large-scale, integrated hydrogen production from renewable energy sources is expected to become the mainstream of hydrogen energy supply, and building a hydrogen energy system based on green hydrogen is a key development direction for the power and energy industries.

[0003] However, an important factor restricting the rapid advancement of green hydrogen projects is grid access. On the one hand, the high-voltage access of integrated wind, solar and hydrogen (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 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 off the grid, but it may also reduce capacity fee expenditures and drive a significant reduction in the electricity cost of 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 economic efficiency 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 off-grid hydrogen production system within a preset time range, the green 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, where T is an integer greater than 1, the method comprising: determining the total hydrogen production of the electrolyzer at the t-th time step based on 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 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; the state of charge of the energy storage device at the t-th time step is determined based on 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 the hydrogen production at the t-th time step is determined based on the electrolysis power of the electrolytic cell 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 a preset time range.

[0006] In one possible implementation, the device parameters include the minimum state of charge and 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 When the state of charge of the power generating device is greater than the minimum state of charge, determine whether the sum of the power supply power of the power generating 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 electrolyzer, and obtain a second judgment result; when the second judgment result indicates that the sum of the power supply power of the power generating 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 electrolyzer, determine the upper limit of the electrolysis power of the electrolyzer as the electrolysis power of the electrolyzer at the t-th time step, and determine the difference between the upper limit of the electrolysis power of the electrolyzer and the power supply power of the power generating device at the t-th time step as the discharge power of the energy storage device at the t-th time step.

[0007] In one 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, 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.

[0008] In one 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 upper limit of the electrolysis power of the electrolyzer at the t-1th time step. whether the state of charge of the energy storage device is greater than or equal to the maximum state of charge, and a third judgment result is obtained; 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 t-1th 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 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 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 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 between 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 one 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, to 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, 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 t-th time step includes: obtaining wind speed data at the t-th time step; inputting 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 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.

[0013] According to one aspect of the present disclosure, an evaluation device is provided, which 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, and the preset time range includes T time steps, where T is an integer greater than 1, and the device includes: a first determination module for determining the electrolysis power of the electrolyzer at the t-th time step based on 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-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; 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 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, and 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 power supply power of the power generation equipment 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 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 device 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 device at the t-th time step.

[0015] In one possible implementation, the first determination module is further configured to: 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, determine 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 determine 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, determine 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 determine 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 one possible implementation, the device parameters include the maximum state of charge and 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 at the t-1th time step is greater than or equal to the maximum state of charge, 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, and 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 tth time step is less than the maximum state of charge. 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 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, and the power supply power includes wind power. 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 or discharging power of the energy storage device can be dynamically adjusted in real time based on 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 maximize the utilization 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 flowchart illustrating an evaluation method according to an embodiment of the present disclosure is shown.

[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 illustrating 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 is shown.

[0031] Figure 5 A schematic diagram illustrating 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 is shown.

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

[0033] Figure 7 A graph schematically illustrates 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] Figure 9 A block diagram of an evaluation device according to an embodiment of the present disclosure is shown.

[0036] Figure 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 indicated.

[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, numerous specific details are provided in the following detailed description to better illustrate the present disclosure. Those skilled in the art will appreciate that the present disclosure can be practiced without certain specific details. In some instances, methods, means, components, and circuits well known to those skilled in the art are not described in detail in order to highlight the main points 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, driving 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. To provide a stable power supply to the electrolyzer 2, the green electricity off-grid hydrogen production system can be equipped with an energy storage device 3. When the power provided by the power generation device 1 is sufficient, the energy storage device 3 can be charged. When the power provided by the power generation device 1 is insufficient, the energy storage device 3 can supplement the power.

[0041] For example, green electricity refers to electricity that emits zero or near-zero carbon dioxide during its production process, and has a lower environmental impact than electricity produced by other means (such as thermal power generation). Green electricity can come from sources such as solar energy, wind power, biomass energy, and geothermal energy, and the embodiments of this disclosure are not limited thereto.

[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 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 energy storage device 3.

[0044] Figure 2 Flowchart showing the evaluation method according to the embodiment of the present disclosure. Figure 2 As shown, the method is used to evaluate the total hydrogen production of a green electricity off-grid hydrogen production system within a preset time range, where the preset time range includes T time steps. 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 based on the obtained 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 based on 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-1-th time step, and the hydrogen production at the t-th time step is determined based on the electrolysis power of the electrolyzer 2 at the t-th time step;

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

[0048] In this way, the electrolysis power of electrolyzer 2 and the charging or discharging power of energy storage device 3 can be dynamically adjusted in real time based on the power supply of power generation equipment 1, the charge state of energy storage device 3, and the equipment parameters of the green electricity off-grid hydrogen production system, with the set time step as the unit. This response mechanism helps maximize the utilization of renewable energy and improve the operating efficiency and service life of the green electricity off-grid hydrogen production system. In addition, based on the electrolysis power of 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 one possible implementation, the preset time range may include T time steps, i.e., from the first time step to the Tth time step, with the tth time step representing a time step from the first time step to the Tth time step. For example, assuming the preset time range is one year, and 15 minutes is one time step, the number of time steps that can be included in the one-year time range is T = 365 × 24 × 60 ÷ 15 = 35040, where t is any integer between 1 and 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 they can be set according to actual application scenarios.

[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, and 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 supplied by power generation equipment 1 during the first time step can be determined by the green energy intensity (e.g., wind speed, sunlight intensity, etc.) during that time step and the hardware performance parameters of power generation equipment 1. For example, the green energy intensity (e.g., wind speed) during the current time step can be input into a preset mathematical model to determine the power supplied by power generation equipment 1 during that time step. The preset data model can be constructed based on the hardware performance parameters of power generation equipment 1, and the embodiments of this 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 are mostly 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. 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 supplied by power generation device 1 at the first time step is within the electrolysis power range, combined with the state of charge (SOC(0)) of energy storage device 3, it is determined that energy storage device 3 has discharge capability at the first time step. The electrolysis power of electrolytic cell 2 can be supplied by both power generation device 1 and energy storage device 3, or only by power generation device 1. The electrolysis power of electrolytic cell 2 and the power of energy storage device 3 can be determined based on the specific supply conditions.

[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 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 fully charged, 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 0.

[0057] If the power supply of the power generation device 1 is less than the lower limit of the electrolysis power in the first time step, the state of charge SOC(0) of the energy storage device 3 should also be combined to determine whether the energy storage device 3 has the discharge capability or neither discharges nor charges in the first time step, thereby deciding whether to shut down the entire green electricity off-grid hydrogen production system 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 based on 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 in 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 Δt represents the length of the time step.

[0059] And the hydrogen production per minute at the first time step can be determined based on 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 in the first 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.

[0060] In one 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 based on 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. The state of charge SOC(1) of the energy storage device 3 can be obtained at the first time step. The method for obtaining the power supply power of the power generation device 1 and the equipment parameters of the green electricity off-grid hydrogen production system at the second time step can refer to the method for obtaining the power supply power of the power generation device 1 and the equipment parameters of the green electricity off-grid hydrogen production system at the first time step above, 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 judged whether the energy storage device 3 has the discharge capability 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 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 (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.

[0063] If the power supply 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 state of charge 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, thereby deciding whether to shut down the entire green electricity off-grid hydrogen production system, or shut down the electrolyzer 2 and charge the energy storage device 3, 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 based on 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 in 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 Δt represents the length of the time step.

[0065] And the hydrogen production per minute in the second time step can be determined according to the electrolysis power of electrolyzer 2 in 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 in the second 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.

[0066] Similarly, 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 based on 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. The method for obtaining the power supply power of the power generation device 1 and the equipment parameters of the green electricity off-grid hydrogen production system at the t-th time step can refer to the method for obtaining the power supply power of the power generation device 1 and the equipment parameters of the green electricity off-grid hydrogen production system at the first time step above, and 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 state of charge 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 capability 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 of power generation device 1 at the t-th time step is greater than the upper limit of electrolysis power, power generation device 1 itself can provide sufficient power supply to electrolytic cell 2, and the electrolysis power of electrolytic cell 2 is the upper limit of electrolysis power. At the same time, the state of charge SOC(t-1) of energy storage device 3 at the previous time step can be combined to determine whether energy storage device 3 is allowed to charge at this time step. If the state of charge SOC(t-1) of energy storage device 3 is fully charged, the charging power and discharge power of energy storage device 3 are the same, both 0; if the state of charge SOC(t-1) of energy storage device 3 is not fully charged, the charging power of energy storage device 3 can be determined as the minimum value of the difference between the power supply power and the upper limit of electrolysis power and the maximum charging power.

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

[0070] In one 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 t-th 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 t-th 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 based on 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-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 evaluation method of the embodiment of the present disclosure is described below using a wind power off-grid hydrogen production system as an example.

[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, and the power supply includes wind power. 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 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, which is also the minimum wind speed for wind turbines to be connected to the grid for power generation; 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, which is also the maximum wind speed for wind turbines to connect 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 represents 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 the energy storage device 3 at the t-1 time step, and the minimum state of charge SOC of the 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 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 a minimum state of charge at the t-1th time step, and obtaining a first judgment 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 the 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 helps to operate the electrolyzer 2 safely and prevent equipment damage or safety accidents caused by power overload.

[0089] Figure 3 A 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 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 factors such as the structural design of the electrolytic cell 2, the electrode material, and the electrode spacing. 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), is 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 electrolytic cell 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-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-2 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 to the electrolyzer 2. The wind power P of the wind turbine at the tth time step can be directly converted to 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 electrolytic cell 2, and the energy storage device 3 cannot be charged. The charging power P of the energy storage device 3 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 of electrolysis power P 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 electrolysis power upper limit P of the electrolyzer 2. elz,max Considering the excessive electrolysis power (for example, exceeding the upper limit of electrolysis power P elz,max The power of electrolytic cell 2 will be damaged, and the electrolytic power 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 and the wind power P of the wind turbine at the tth time step w The difference between (t) is determined as the discharge power P of the energy storage device 3 at the t-th 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 time step t, the power provided by the wind turbine and the energy storage device 3 cannot reach the upper limit of the electrolysis power of the electrolyzer 2, P elz,max , will not damage the electrolyzer 2. In order to make the 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 Determine the discharge power P of the 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 electrolytic cell 2 and energy storage device 3) to dynamically adjust the electrolysis power P of electrolytic cell 2 elz (t) and the discharge power P of the energy storage device disc (t). This dynamic adjustment helps 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 device 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 operates at maximum efficiency, avoiding energy waste or equipment damage that may be caused by excessive power supply. Moreover, the charging power or discharge 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 does not need to be charged 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 device 1 (for example, the difference between the power supply power of the power generation device 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, thereby reducing the probability of overheating or damage of the energy storage device 3 due to excessive charging power.

[0099] Figure 4 A schematic diagram showing another method for 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 factors such as the structural design of the electrolytic cell 2, the electrode material, and the electrode spacing. 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 there is more electricity 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-1 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-2 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 since the wind power P of the wind turbine at the current t-th time step is 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 is 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 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 judgment result;

[0105] If 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, determine 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 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 electrolytic cell 2, 0 is determined as the electrolysis power of the electrolytic cell 2 at the t-th time step, and the minimum value of the power supply power of the power generation device 1 and the maximum charging power of the energy storage device 3 at the t-th time step is determined as the charging power of the energy storage device 3 at the t-th time step.

[0107] In this way, if energy storage device 3 is not fully charged, the power supply of power generation device 1 and the maximum discharge power of energy storage device 3 can be used to determine whether the power shortage can be supplemented by discharging energy storage device 3. If the total power of energy storage device 3 after discharge is still insufficient to meet the needs of electrolyzer 2, electrolyzer 2 can be stopped and energy storage device 3 will be charged to reserve energy for subsequent use. This strategy ensures the effective utilization of 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-1-th 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 falls below the minimum state of charge, the discharge of the energy storage device 3 can be stopped, causing the electrolytic cell 2 to stop operating and the energy storage device 3 to be charged instead. This protects the service life of the energy storage device 3 and reduces 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 electrolytic cell 2, zero is determined as the electrolysis power of the electrolytic cell 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 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 t time steps 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.

[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. This can reduce damage to 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 used to supply power to the electrolyzer 2 at its maximum discharge power, so that the electrolyzer 2 can produce as much hydrogen as possible.

[0114] Figure 5 A schematic diagram showing another method for 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 factors such as the structural design of the electrolytic cell 2, the electrode material, and the electrode spacing. 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 judged whether the state of charge SOC(t-1) of the energy storage device 3 at the t-1 time step is less than the maximum state of charge SOC max , obtaining 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 , 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 electrolytic cell 2, they cannot drive the electrolytic cell 2 to work. At this time, the electrolytic cell 2 can be stopped. The electrolysis power P of the electrolytic cell 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) The energy storage device 3 is charged. The charging power P of the energy storage device 3 at the tth time step is 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. By selecting the wind power P w (t) and maximum charging power P c,max The minimum value among them is taken as the charging power P of energy storage device 3 c (t), which can reduce the overcharging operation of 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 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-1 time step is greater than the minimum state of charge SOC min , 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. The energy storage device 3 can cooperate with the wind turbine to provide power for the electrolyzer 2. 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 to 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) The energy storage device 3 is charged. The charging power P of the energy storage device 3 at the tth time step is 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. By selecting the wind power P w (t) and maximum charging power P c,max The minimum value among them is taken as the charging power P of energy storage device 3 c (t), which can reduce the overcharging operation of 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 of electrolysis power P of electrolytic cell 2? elz,min , get 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 electrolytic cell 2, they cannot drive the electrolytic cell 2 to work. At this time, the electrolytic cell 2 can be stopped. The electrolysis power P of the electrolytic cell 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 that: 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 electrolytic cell 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 calculated based on the wind power P w (t) can be used to adjust the production rhythm in real time, 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 limiting power, and whether to charge or discharge the energy storage device 3 according to different conditions. If the wind power P 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 judged 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) Is it 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 electrolytic cell 2 operates at the upper limit of electrolysis power P elz,max At the same time, the state of charge SOC(t-1) of the energy storage device 3 must be detected to determine whether the energy storage device 3 is allowed to charge in this time step; if the wind power P w (t) is less than the lower limit of electrolysis power P elz,min, it is also necessary to combine the monitoring of the state of charge 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 t-th time step, thereby deciding whether the entire 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 of a curve showing 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 the power, with the unit being 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 diagram shown can more intuitively obtain the annual wind power output and the electrolysis power of electrolyzer 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 understanding of the annual hydrogen production.

[0127] Figure 8 A schematic diagram showing the 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 diagram 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 and 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) can be used to measure the cost of hydrogen production. The LCOH can be defined as the ratio of annual capital costs and annual operating costs (e.g., including fixed and variable components) to the total hydrogen production within a predetermined timeframe (e.g., one year).

[0131]

[0132] Wherein, 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 tth time step, Δt 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 entire off-grid wind power hydrogen production system can be considered to be owned by a user. Therefore, the fixed cost CAPEX and variable operating cost OPEX should include all components in the off-grid wind power hydrogen production system.

[0135] For example, reference Figures 6 to 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 operational details, and obtain more accurate results.

[0137] Figure 9 FIG. 1 is a block diagram of an evaluation device according to an embodiment of the present disclosure. Figure 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, wherein 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, where T is an integer greater than 1. The device includes:

[0138] A first determining module 91 is configured to determine the electrolysis power of the electrolyzer and the electric power of the energy storage device at the t-th time step based on the acquired 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-1-th time step, and the equipment parameters of the green electricity off-grid hydrogen production system, wherein the electric power includes the charging power and the discharging power, and t is any integer between 1 and T;

[0139] a second determining module 92, configured to determine the state of charge of the energy storage device at the t-th time step based on 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 based on the electrolysis power of the electrolyzer at the t-th time step;

[0140] The third determining module 93 is configured 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 one possible implementation, the device parameters include the minimum state of charge and 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, and 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 powers of the energy storage device is greater than or equal to the upper limit of the electrolysis power of the electrolytic cell. If 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 one possible implementation, the first determination module 91 is further configured to: 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, determine 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 determine 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, determine 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 determine 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 one possible implementation, the device parameters include the maximum state of charge and 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 at the t-1th time step is greater than or equal to the maximum state of charge, 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 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 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, and 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 at the t-th time step 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 at the t-th 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.

[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 power 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-1-th 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-1-th 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, and the power supply power includes wind power. 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. For the sake of brevity, it will not be repeated here.

[0149] The present disclosure also provides a computer-readable storage medium having computer program instructions stored thereon, wherein the computer program instructions implement the above method when executed by a processor. The computer-readable storage medium may 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] An embodiment of the present disclosure also provides a computer program product, including computer-readable code, or a non-volatile computer-readable storage medium carrying 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] Figure 10 1 is a block diagram of an electronic device 1900 according to an exemplary embodiment. For example, the electronic device 1900 can be provided as a server or a terminal device. Figure 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 the instructions to perform the above-described method.

[0153] The electronic device 1900 may further 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 that 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, method and / or 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 keep and store the instructions used by the 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 disc 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 having instructions stored thereon, and any suitable combination thereof.Computer-readable storage medium used herein is not interpreted as a transient signal itself, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagated by waveguides or other transmission media (for example, light pulses by fiber optic cables), or electrical signals transmitted by wires.

[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, fiber optic transmission, wireless transmission, 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 to be stored in the computer-readable storage medium in each computing / processing device.

[0158] The computer program instructions for performing the operations of the present disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent 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++, and conventional procedural programming languages ​​such as "C" language or similar programming languages. Computer-readable program instructions may be executed entirely 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 entirely 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., utilizing 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 personalized by utilizing the state information of the computer-readable program instructions. 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 flowcharts and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present disclosure. It should be understood that each block of the flowcharts and / or block diagrams, and combinations of blocks in the flowcharts and / or block diagrams, 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 is generated that implements the functions / actions specified in one or more blocks in the flowchart and / or block diagram. These computer-readable program instructions can also be stored in a computer-readable storage medium, where these instructions cause the computer, programmable data processing device, and / or other device to operate in a specific manner. Thus, the computer-readable medium storing the instructions comprises an article of manufacture that includes instructions for implementing various aspects of the functions / actions specified in one or more blocks 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 operational 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 blocks in the flowchart and / or block diagram.

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

[0163] While various embodiments of the present disclosure have been described above, the foregoing description is intended to be illustrative, non-exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or technological improvements in the marketplace, or to enable others skilled 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. The preset time range includes T time steps, where T is an integer greater than 1. The method includes: Determine the electrolysis power of the electrolyzer and the electric power of the energy storage device at the t-th time step based on 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, wherein the electric power includes charging power and 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 based on 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 electrolytic cell 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, Determining the electrolysis power of the electrolyzer and the electric power of the energy storage device at the tth time step according to the obtained 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, including: When the power supply is within the electrolysis power range of the electrolytic cell, determining whether the state of charge of the energy storage device is greater than a minimum state of charge at the t-1th time step, and obtaining a first determination result; If 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 electrolysis power upper limit 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: if 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, wherein 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, Determining the electrolysis power of the electrolyzer and the electric power of the energy storage device at the tth time step according to the obtained 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, including: When the power supply 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; If 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 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.

5. The method according to claim 1, wherein The equipment 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. Determining the electrolysis power of the electrolyzer and the electric power of the energy storage device at the tth time step according to the obtained 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, including: When the power supply 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, to obtain a fourth determination result; If 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 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 equipment and the maximum charging power of the energy storage equipment at the t-th time step is determined as the charging power of the energy storage device at the t-th 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: If 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-1-th 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, 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 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; 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 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, and the power supply includes wind power. Obtaining the power supply power of the power generation equipment at the t-th time step includes: Get the wind speed data at the tth time step; Inputting 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 based on the sum of hydrogen production at 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 including 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 configured to determine the electrolysis power of the electrolyzer and the electric power of the energy storage device at the t-th time step based on the acquired 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, wherein the electric power includes charging power and discharging power, and t is any integer between 1 and T; a second determination module, configured to determine the state of charge of the energy storage device at the t-th time step based on 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 based on the electrolysis power of the electrolyzer at the t-th time step; The third determination module is configured 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 according to 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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