A method for controlling power of a light hydrogen storage system, the light hydrogen storage system, and a storage medium

Abstract

The embodiment of the present application relates to the photovoltaic hydrogen production technical field, especially to a kind of power control method of light hydrogen storage system, light hydrogen storage system and storage medium.The embodiment of the present application obtains photovoltaic power generation power by smoothing filtering to the output power of photovoltaic module, determines the working power regulation value of electrolytic cell according to the state of charge value and expected charge interval of energy storage battery, to determine the target working power value of smooth and stable electrolytic cell according to photovoltaic power generation power and working power regulation value, the target working power value of electrolytic cell can be used to adjust the working power of electrolytic cell smoothly and stably, reduce or avoid the situation that power fluctuation is relatively large in the power control process of electrolytic cell, prolong the service life of electrolytic cell, without configuring high-performance super capacitor and energy storage battery, reduce system cost and complexity, improve system operation efficiency.

Description

Technical Field

[0001] The present invention relates to the field of photovoltaic hydrogen production technology, and in particular to a power control method for a photovoltaic hydrogen storage system, a photovoltaic hydrogen storage system and a storage medium. Background Technology

[0002] With the transformation of the global energy structure and the severe challenges of climate change, the development and utilization of renewable energy has become a focus of international attention. Solar energy, as one of the richest and cleanest renewable energy sources, has seen significant progress in photovoltaic power generation technology in recent years and has been widely applied globally.

[0003] With the decreasing cost of photovoltaic (PV) power generation, PV-based hydrogen production / storage is considered a crucial pathway to achieving "green hydrogen" production. Hydrogen production equipment or devices (such as electrolyzers) are expected to operate at stable power levels to extend their lifespan and improve efficiency. However, the intermittent and fluctuating nature of PV power generation poses a significant challenge to the stable operation of hydrogen production equipment. Related technologies incorporate batteries as energy storage systems, forming a photovoltaic-hydrogen storage system together with the PV power generation system and hydrogen production equipment. Among these technologies, power control in hydrogen production equipment primarily suffers from the following two methods and their inherent drawbacks:

[0004] 1) Photovoltaic power tracking method: This method allows the power of the hydrogen production equipment to follow the changes in photovoltaic power as closely as possible in real time. The drawback of this method is that the hydrogen production equipment is sensitive to power fluctuations. Frequent and drastic power changes will accelerate the aging of the hydrogen production equipment, affecting its service life and hydrogen production efficiency. To alleviate this problem, it is necessary to configure supercapacitors with extremely fast response speeds, which increases the complexity and cost of the photovoltaic hydrogen storage system.

[0005] 2) Power Supply After Full Smoothing Through Energy Storage System: This method involves configuring large-capacity batteries to fully smooth the photovoltaic power generation before supplying highly stable power to the hydrogen production equipment. The drawbacks of this method are: extremely high battery capacity requirements, leading to a significant increase in system costs; and the batteries need to absorb or release all the fluctuating energy from the photovoltaic power generation, acting as the primary energy buffer rather than a power regulator. Furthermore, the batteries are prone to extreme states of being fully charged or discharged, at which point the system must limit photovoltaic power generation or shut down the hydrogen production equipment, reducing the overall system operating efficiency and energy utilization rate. Summary of the Invention

[0006] In view of this, one objective of the embodiments of the present invention is to provide a power control method for a photohydrogen storage system, a photohydrogen storage system and a storage medium, aiming to solve the technical problem of large power fluctuations during the power control process of the electrolyzer in the photohydrogen storage system.

[0007] To address the aforementioned technical problems, the embodiments of the present invention provide the following technical solutions:

[0008] In a first aspect, embodiments of the present invention provide a power control method for a photovoltaic hydrogen storage system, comprising:

[0009] The output power of the photovoltaic module at the current moment is filtered to obtain the photovoltaic power generation power of the photovoltaic module at the current moment;

[0010] Based on the current state of charge of the energy storage battery and the preset expected charge range of the energy storage battery, determine the current operating power adjustment value of the electrolyzer.

[0011] The target operating power value of the electrolytic cell is determined based on the current photovoltaic power generation and the current operating power adjustment value.

[0012] In some embodiments, determining the current operating power adjustment value of the electrolyzer based on the current state of charge (SOC) value of the energy storage battery and a preset desired SOC range for the energy storage battery includes:

[0013] Based on the desired charge range, the target charge value of the energy storage battery is determined;

[0014] In response to the fact that the state of charge of the energy storage battery at the current moment is within the desired charge range, the operating power adjustment value at the current moment is calculated based on the state of charge value at the current moment, the target charge value, and the first adjustment coefficient.

[0015] In response to the fact that the state of charge of the energy storage battery at the current moment is greater than the maximum value of the expected charge range, the operating power adjustment value at the current moment is calculated based on the state of charge value at the current moment, the target charge value, the maximum value, the first adjustment coefficient, and the second adjustment coefficient.

[0016] In response to the fact that the current state of charge (SOC) value of the energy storage battery is less than the minimum value of the desired charge range, the operating power adjustment value at the current moment is calculated based on the current SOC value, the target charge value, the minimum value, the first adjustment coefficient, and the second adjustment coefficient.

[0017] The first adjustment coefficient is smaller than the second adjustment coefficient.

[0018] In some embodiments, in response to the current state of charge (SOC) value of the energy storage battery being within a desired charge range, the operating power adjustment value at the current moment is calculated based on the current SOC value, the target charge value, and a first adjustment coefficient, including:

[0019] When the current state of charge value is greater than the target value of charge and less than or equal to the maximum value, the operating power adjustment value at the current moment is obtained based on the product of the first adjustment coefficient and the first charge difference, wherein the first charge difference is the difference between the current state of charge value and the target value of charge.

[0020] When the current state of charge value is greater than or equal to the minimum value and less than the target value, the operating power adjustment value at the current moment is obtained based on the product of the first value and the second charge difference. The second charge difference is the difference between the target value and the current state of charge value, and the first value is the opposite of the first adjustment coefficient.

[0021] In some embodiments, in response to the current state of charge (SOC) value of the energy storage battery being greater than the maximum value of the desired charge range, the operating power adjustment value at the current moment is calculated based on the current SOC value, the target charge value, the maximum value, a first adjustment factor, and a second adjustment factor, including:

[0022] The first power value is obtained by multiplying the first adjustment coefficient and the first charge difference, where the first charge difference is the difference between the current state of charge value and the target charge value.

[0023] The second power value is obtained by multiplying the second adjustment coefficient and the third charge difference. The third charge difference is the difference between the current state of charge value and the maximum value.

[0024] The operating power adjustment value at the current moment is obtained by summing the first power value and the second power value.

[0025] In some embodiments, in response to the current state of charge (SOC) value of the energy storage battery being less than the minimum value of the desired charge range, the operating power adjustment value at the current moment is calculated based on the current SOC value, the target charge value, the minimum value, a first adjustment factor, and a second adjustment factor, including:

[0026] The third power value is obtained by multiplying the first value and the second charge difference. The second charge difference is the difference between the target charge value and the current state of charge value. The first value is the opposite of the first adjustment coefficient.

[0027] The fourth power value is obtained by multiplying the second value and the fourth charge difference. The fourth charge difference is the difference between the minimum value and the current state of charge value. The second value is the opposite of the second adjustment coefficient.

[0028] The operating power adjustment value at the current moment is obtained by summing the third power value and the fourth power value.

[0029] In some embodiments, the method further includes:

[0030] Based on the rated power of the electrolyzer, the target charge value, and the current state of charge value of the energy storage battery, the first adjustment coefficient and the second adjustment coefficient are determined.

[0031] In some embodiments, determining a first adjustment coefficient and a second adjustment coefficient based on the rated power of the electrolyzer, the target charge value, and the current state of charge value of the energy storage battery includes:

[0032] Determine the absolute difference between the current state of charge and the target state of charge;

[0033] The ratio is determined based on the quotient of the absolute difference and the target charge value;

[0034] The first coefficient is determined based on the product of the rated power of the electrolytic cell and the first preset ratio value;

[0035] The second coefficient is determined based on the product of the rated power of the electrolytic cell and the second preset ratio value;

[0036] The first adjustment coefficient is determined based on the product of the ratio and the first coefficient;

[0037] The second adjustment coefficient is determined based on the product of the ratio and the second coefficient.

[0038] Wherein, both the first preset ratio value and the second preset ratio value are greater than 0, and the first preset ratio value is less than the second preset ratio value.

[0039] In some embodiments, after determining the target operating power value of the electrolytic cell, the method further includes: gradually adjusting the operating power of the electrolytic cell to the target operating power value during at least one adjustment cycle, including:

[0040] Obtain the absolute power difference between the actual operating power of the electrolytic cell at the current moment and the target operating power value at the current moment;

[0041] When the absolute power difference at the current moment is greater than the power change threshold, the sum of the power change threshold and the actual working power at the current moment shall be used as the adjusted working power of the electrolytic cell for the current adjustment cycle.

[0042] When the absolute power difference at the current moment is less than or equal to the power change threshold, the working power of the electrolytic cell is adjusted to the target working power value.

[0043] In some embodiments, filtering the output power of the photovoltaic module at the current moment to obtain the photovoltaic power generation of the photovoltaic module at the current moment includes:

[0044] Obtain the N photovoltaic power generation values ​​of the photovoltaic module N times ago;

[0045] Calculate the average of the output power of N photovoltaic power units and the output power of the photovoltaic module at the current moment to obtain the photovoltaic power generation at the current moment.

[0046] In a second aspect, embodiments of the present invention provide a photoelectric hydrogen storage system, comprising:

[0047] A DC-DC converter and a photovoltaic module, energy storage battery and electrolytic cell connected to the DC-DC converter;

[0048] The processor, connected to the photovoltaic module, the energy storage battery, and the electrolyzer, is used to acquire the output power of the photovoltaic module, the state of charge value of the energy storage battery, and the operating power of the electrolyzer, and to execute any of the photovoltaic hydrogen storage system power control methods proposed in the first aspect.

[0049] Thirdly, embodiments of the present invention provide a computer-readable storage medium storing processor-executable computer program instructions, which, when executed by a processor, cause the computer to perform any of the power control methods for a photovoltaic hydrogen storage system proposed in the first aspect.

[0050] The embodiments of the present invention have the following beneficial effects: Unlike related technologies, the power control method for a photovoltaic hydrogen storage system provided in the embodiments of the present invention includes: filtering the output power of the photovoltaic module at the current moment to obtain the photovoltaic power generation of the photovoltaic module at the current moment; determining the working power adjustment value of the electrolyzer at the current moment based on the state of charge value of the energy storage battery at the current moment and the preset desired charge range of the energy storage battery; and determining the target working power value of the electrolyzer based on the photovoltaic power generation and the working power adjustment value at the current moment.

[0051] This invention provides a method to smooth and filter the output power of photovoltaic modules to obtain photovoltaic power generation. Based on the state of charge (SOC) value of the energy storage battery and the desired charge range, the operating power adjustment value of the electrolyzer is determined. Thus, based on the photovoltaic power generation and the operating power adjustment value, a smooth and stable target operating power value for the electrolyzer is determined. This allows for smooth and stable adjustment of the electrolyzer's operating power, reducing or even avoiding large power fluctuations during power control, extending the electrolyzer's lifespan, eliminating the need for high-performance supercapacitors and energy storage batteries, reducing system cost and complexity, and improving system operating efficiency. Attached Figure Description

[0052] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the prior art or embodiments will be briefly introduced below. Obviously, the drawings described below only show some embodiments of the present invention and should not be considered as limiting the scope of protection. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0053] Figure 1 This is a schematic diagram illustrating the application scenario of the power control method for the photovoltaic hydrogen storage system in some embodiments of the present invention;

[0054] Figure 2These are schematic diagrams of the structure of a photoelectric hydrogen storage system provided in some embodiments of the present invention;

[0055] Figure 3 This is a schematic flowchart of a power control method for a photovoltaic hydrogen storage system provided in some embodiments of the present invention;

[0056] Figure 4 yes Figure 3 A schematic diagram of a sub-process of step S41 in the power control method of the photovoltaic hydrogen storage system shown in the embodiment;

[0057] Figure 5 yes Figure 3 A schematic diagram of a sub-process of step S42 in the power control method of the photovoltaic hydrogen storage system shown in the embodiment;

[0058] Figure 6 This is a schematic diagram of the correspondence curve between the working power adjustment value of the electrolytic cell and the state of charge value of the energy storage battery in some embodiments of the present invention, wherein the working power adjustment value of the electrolytic cell does not change abruptly;

[0059] Figure 7 This is a schematic diagram of the correspondence curve between the working power adjustment value of the electrolytic cell and the state of charge value of the energy storage battery in some embodiments of the present invention, wherein the working power adjustment value of the electrolytic cell shows a jump.

[0060] Figure 8 This is a schematic diagram of the correspondence curve between the working power adjustment value of the electrolytic cell and the state of charge value of the energy storage battery in some other embodiments of the present invention, wherein the working power adjustment value of the electrolytic cell does not change abruptly;

[0061] Figure 9a This is a schematic diagram illustrating the operation of the photovoltaic module, electrolytic cell, and energy storage battery in some embodiments of the present invention, wherein the capacity of the energy storage battery is 10kWh;

[0062] Figure 9b This is a schematic diagram illustrating the operation of the photovoltaic module, electrolytic cell, and energy storage battery in some embodiments of the present invention, wherein the capacity of the energy storage battery is 5kWh;

[0063] Figure 10a This is a schematic diagram of the operation of the photovoltaic module, electrolytic cell and energy storage battery in some other embodiments of the present invention, wherein the capacity of the energy storage battery is 10kWh;

[0064] Figure 10b This is a schematic diagram of the operation of the photovoltaic module, electrolytic cell and energy storage battery in some other embodiments of the present invention, wherein the capacity of the energy storage battery is 10kWh;

[0065] Figure 10cThis is a schematic diagram illustrating the operation of the photovoltaic module, electrolytic cell, and energy storage battery in other embodiments of the present invention, wherein the capacity of the energy storage battery is 10kWh. Detailed Implementation

[0066] To make the objectives and advantages of the embodiments of the present invention more readily understood, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. The detailed description of the embodiments of the present invention in the accompanying drawings is not intended to limit the scope of protection claimed by the present invention, but only to illustrate selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0067] It should be noted that, unless there is a conflict, the various technical features involved in the embodiments of the present invention described below can be combined with each other, and all are within the protection scope of the present invention. Furthermore, although functional modules are divided in the device or structural schematic diagram and a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. In addition, the terms "first," "second," "third," and other similar expressions used herein do not limit the data or execution order, but are only for illustrative purposes and to distinguish identical or similar items with substantially the same function and effect, and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features.

[0068] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. It should be understood that the term "and / or" as used herein includes any and all combinations of one or more of the listed items.

[0069] In related technologies, the power control strategies for electrolyzers in photovoltaic hydrogen storage systems mainly fall into two categories and their inherent drawbacks:

[0070] 1) Direct Photovoltaic Power Tracking Strategy: This strategy aims to make the electrolyzer power follow changes in photovoltaic power as closely as possible in real time. However, this strategy has a drawback: the electrolyzer is highly sensitive to power fluctuations. Frequent and drastic power changes accelerate the aging of the electrolyzer, affecting its lifespan and hydrogen production efficiency. To mitigate this problem, high-performance supercapacitors with extremely fast response times are required, increasing system complexity and cost.

[0071] 2) Power Supply Strategy Through Complete Energy Storage Smoothing: This strategy involves configuring large-capacity, high-performance batteries to completely smooth the photovoltaic power before supplying highly stable power to the electrolyzer. The drawback of this strategy is that it places extremely high demands on the capacity and performance of the batteries, leading to a significant increase in cost. The batteries need to absorb or release all the fluctuating energy from the photovoltaic power generation, acting as the primary energy buffer rather than a power regulator. Furthermore, the batteries are prone to extreme states of being fully charged or discharged, at which point the system must limit photovoltaic power or shut down the electrolyzer, reducing overall operating efficiency and energy utilization.

[0072] In summary, the core problem with the relevant technologies lies in the failure to effectively coordinate and decouple the short-term power fluctuation management of photovoltaics from the long-term energy balance management of the system, and the inability to achieve a good balance among the three objectives of "reducing the cost of energy storage configuration", "smoothing the power of electrolyzers" and "maximizing the utilization of photovoltaic energy".

[0073] In view of this, embodiments of the present invention provide a power control method for a photovoltaic hydrogen storage system. The method obtains the photovoltaic power generation by smoothing and filtering the output power of the photovoltaic module. It then determines the operating power adjustment value of the electrolyzer based on the state of charge value of the energy storage battery and the desired charge range. This allows for the determination of a smooth and stable target operating power value for the electrolyzer based on the photovoltaic power generation and the operating power adjustment value. By adjusting the electrolyzer's operating power smoothly and stably according to the target operating power value, the method reduces or even avoids large power fluctuations during power control, extends the electrolyzer's service life, and eliminates the need for high-performance supercapacitors and energy storage batteries, thus reducing system cost and complexity and improving system operating efficiency.

[0074] Please refer to the following: Figure 1 and Figure 2 , Figure 1 The schematic diagram illustrates an application scenario of the power control method for a photovoltaic hydrogen storage system provided in some embodiments of the present invention. Figure 2 The schematic diagram illustrates the structure of a photohydrogen storage system provided in some embodiments of the present invention.

[0075] See Figure 1 or Figure 2 As shown, the photovoltaic hydrogen storage system 100 includes an energy storage battery 110, a photovoltaic module 120, a DC-DC converter 130, an electrolyzer 140, and a processor 150. The energy storage battery 110, photovoltaic module 120, and electrolyzer 140 are all electrically connected to the DC-DC converter 130, and the processor 150 is communicatively connected to the energy storage battery 110, photovoltaic module 120, and electrolyzer 140.

[0076] For example, the photovoltaic module 120 serves as the energy source for the photovoltaic hydrogen storage system 100, converting solar energy into electrical energy and outputting the electrical energy to the DC-DC converter 130. The output power of the photovoltaic module 120 dynamically changes with the light intensity. The electrical energy is output from the DC-DC converter 130 to the electrolyzer 140 for use or to the energy storage battery 110 for storage.

[0077] In some embodiments of the present invention, the DC-DC converter 130 serves as an energy dispatching device. It dynamically adjusts impedance matching using the MPPT (Maximum Power Point Tracking) algorithm to maximize photovoltaic power generation efficiency and converts photovoltaic output power into stable DC power required by the electrolyzer 140 and the energy storage battery 110, and outputs the converted DC power to the electrolyzer 140 or the energy storage battery 110.

[0078] As an energy buffer device, the energy storage battery 110 can be a standard-performance battery, without the need for high-capacity or high-performance configurations. The energy storage battery 110 compensates for the fluctuations in photovoltaic power generation and the response delay of the photovoltaic-hydrogen storage system 100 through its rapid charge-discharge characteristics, ensuring the stable operation and efficient energy utilization of the photovoltaic-hydrogen storage system 100. When the output power of the photovoltaic module 120 is insufficient, the energy storage battery 110 discharges instantaneously to compensate for the power shortfall, maintaining the continuous operation of the electrolyzer 140. When the output power of the photovoltaic module 120 is excessive, the energy storage battery 110 stores surplus energy to prevent wasted solar power. In this way, large power fluctuations in the electrolyzer 140 are reduced or avoided, ensuring a continuous and stable power supply to the electrolyzer 140.

[0079] In this embodiment, the electrolyzer 140 serves as a hydrogen production terminal, receiving stable electrical energy from the DC converter 130 to drive the water electrolysis reaction to produce hydrogen. The produced hydrogen can be supplied to other industries.

[0080] For example, the processor 150 is configured to acquire the output power of the photovoltaic module 120, the state of charge (SOC) value of the energy storage battery 110, and the operating power of the electrolyzer 140, and coordinate the various components in the photovoltaic hydrogen storage system 100 to work together to complete the adjustment and control of the operating power of the electrolyzer 140.

[0081] For example, in this embodiment of the invention, after obtaining the output power of the photovoltaic module 120, the output power of the photovoltaic module 120 at the current moment is filtered to obtain the photovoltaic power generation of the photovoltaic module 120 at the current moment. After obtaining the state of charge (SOC) value of the energy storage battery 110 at the current moment, this embodiment of the invention determines the operating power adjustment value of the electrolytic cell 140 at the current moment based on the SOC value of the energy storage battery 110 at the current moment and a preset desired SOC range for the energy storage battery 110. It should be understood that engineers can customize and set the desired SOC range based on engineering experience and battery characteristics. After obtaining the photovoltaic power generation of the photovoltaic module 120 at the current moment and the operating power adjustment value of the electrolytic cell 140 at the current moment, this embodiment of the invention determines the target operating power value of the electrolytic cell 140 at the current moment based on the photovoltaic power generation of the photovoltaic module 120 at the current moment and the operating power adjustment value of the electrolytic cell 140 at the current moment. In this way, this embodiment of the invention can smoothly and stably adjust the operating power of the electrolytic cell 140 according to the target operating power value of the electrolytic cell 140 at the current moment.

[0082] It should be understood that Figure 1 and Figure 2 This illustration merely demonstrates one scenario of power control for the photovoltaic hydrogen storage system 100 in some embodiments of the present invention. It does not limit the structure, type, or quantity of the photovoltaic hydrogen storage system 100 in other application scenarios. Other embodiments of the photovoltaic hydrogen storage system may also include... Figure 1 and Figure 2 The structure shown has more or fewer components, or has the same as Figure 1 and Figure 2 The diagram shows different configurations of the structure.

[0083] As can be understood from the above, the implementing entity of the power control method for the photovoltaic hydrogen storage system provided in this embodiment of the invention can be any suitable type of processor with certain computing and control capabilities, such as the processor 150 mentioned above.

[0084] The power control method for a photoelectric hydrogen storage system provided in this invention will be described in detail below, taking into account exemplary applications and implementations of the processor provided in the embodiments of this invention.

[0085] Please see Figure 3 , Figure 3 The schematic diagram illustrates a flow chart of a power control method for a photohydrogen storage system provided in some embodiments of the present invention.

[0086] like Figure 3 As shown, the power control method for the photovoltaic hydrogen storage system includes, but is not limited to, the following steps S41-S43.

[0087] S41: Filter the output power of the photovoltaic module at the current moment to obtain the photovoltaic power generation of the photovoltaic module at the current moment.

[0088] In some embodiments of the present invention, the output power of the photovoltaic module at the current moment is obtained, and the output power at the current moment is filtered using a first-order low-pass filter. That is, based on the output power of the photovoltaic module at the current moment and the power filtering result at the previous moment, the output power at the current moment is updated according to a preset filtering coefficient to obtain the filtered output result at the current moment. The filtered output result at the current moment is the photovoltaic power generation power of the photovoltaic module at the current moment.

[0089] In some embodiments, the output power at the current moment is filtered using a median filtering method. That is, the median of the output power of the photovoltaic module is taken within a fixed time window, the output power of the photovoltaic module at the current moment and the nearby moments are sorted, and the median value of the sorted output power is taken as the photovoltaic power generation of the photovoltaic module at the current moment.

[0090] Please see Figure 4 , Figure 4 The illustration shows a sub-process diagram of step S41 in the power control method of the photovoltaic hydrogen storage system provided in some embodiments of the present invention.

[0091] like Figure 4 As shown, the output power of the photovoltaic module at the current moment is filtered to obtain the photovoltaic power generation of the photovoltaic module at the current moment, specifically including but not limited to the following steps S411-S412:

[0092] S411: Obtain the N photovoltaic power generation of the photovoltaic module N times ago.

[0093] S412: Calculate the average of the output power of N photovoltaic power units and the output power of the photovoltaic module at the current moment to obtain the photovoltaic power generation at the current moment.

[0094] In step S411, based on the timestamp of the current time, determine the N timestamps that are before the current timestamp, and obtain the photovoltaic power generation of the photovoltaic module at each of the N timestamps (i.e., the power obtained after smoothing and filtering the output power at each time), thus obtaining the N photovoltaic power generation of the photovoltaic module at the first N timestamps.

[0095] In step S412, the average of the N photovoltaic power generation values ​​and the current output power of the photovoltaic module is calculated, and this average value is used as the photovoltaic power generation value of the photovoltaic module at the current moment. For example, the N photovoltaic power generation values ​​and the current output power of the photovoltaic module are substituted into the formula: Calculate the photovoltaic power generation of the photovoltaic module at the current time t. Wherein, Let t be the photovoltaic power generation of the photovoltaic module at the current time t. The sum of the power generated by N photovoltaic cells. The output power of the photovoltaic module at the current moment. This represents the number of moments preceding the current moment.

[0096] In this embodiment, the purpose of filtering the output power of the photovoltaic module at the current moment is to remove high-frequency noise from the output power, extract its changing trend, and use it as a reference for subsequent calculation of the target working power value of the electrolytic cell, thereby improving the accuracy of the calculation.

[0097] S42: Based on the current state of charge of the energy storage battery and the preset expected charge range of the energy storage battery, determine the current operating power adjustment value of the electrolyzer.

[0098] Specifically, the current state of charge (SOC) value of the energy storage battery is compared with the expected SOC range of the energy storage battery. Based on the relationship between the current SOC value and the expected SOC range of the energy storage battery, different calculation methods are used to calculate the current operating power adjustment value of the electrolyzer.

[0099] Understandably, engineers can customize the desired charge range of the energy storage battery based on engineering experience and experimental data, such as a desired charge range of [40%, 60%]. This embodiment of the invention does not impose any limitations on this.

[0100] Please see Figure 5 , Figure 5 The illustration shows a sub-process diagram of step S42 in the power control method of the photovoltaic hydrogen storage system provided in some embodiments of the present invention.

[0101] like Figure 5 As shown, based on the current state of charge of the energy storage battery and the preset desired charge range of the energy storage battery, the current working power adjustment value of the electrolyzer is determined, including but not limited to the following steps S421-S424.

[0102] S421: Determine the target charge value of the energy storage battery based on the desired charge range.

[0103] In this embodiment, any one of the charge values ​​within the desired charge range is determined as the target charge value of the energy storage battery. For example, when the desired charge range is [40%, 60%], a charge value of 50% is determined as the target charge value of the energy storage battery. Of course, engineers can use other charge values ​​within the desired charge range as the target charge values ​​of the energy storage battery based on engineering experience and experimental data.

[0104] S422: In response to the fact that the state of charge of the energy storage battery at the current moment is within the desired charge range, calculate the operating power adjustment value at the current moment based on the state of charge value at the current moment, the target charge value, and the first adjustment coefficient.

[0105] Where t represents the current time. The minimum value of the expected charge interval is the lower limit of charge. And the maximum value of the expected charge range is the upper limit of the charge range. For example, when the desired charge range is [40%, 60%], the lower and upper limits of charge are 40% and 60%, respectively. It is understandable that the first adjustment coefficient... The power regulation coefficient is the first regulation coefficient. The value is a first preset multiple of the rated power of the electrolytic cell, such as 0.1%, 0.2% or any other suitable value.

[0106] In step S422 above, the state of charge value of the energy storage battery at the current moment. When the battery is within the desired charge range, the current state of charge (SOC) value of the energy storage battery is displayed. With upper limit of charge Target value of charge Lower limit of charge A comparison is made, and the working power adjustment value is calculated in different ways based on the different comparison results. .

[0107] In one embodiment, if the current state of charge value Greater than the target charge value And less than or equal to the maximum value When, that is, if Solve for the operating power adjustment value The specific process is as follows:

[0108] Based on the first adjustment coefficient Difference from the first charge Multiply to obtain the current operating power adjustment value. Among them, the first charge difference The current state of charge value With target charge value The difference;

[0109] Right now: .

[0110] Understandably, in this situation, the current operating power adjustment value It is the state of charge value of the energy storage battery at the current moment. A small adjustment that moves the device closer to the target charge value, and the current operating power adjustment value. It is a positive value.

[0111] In another embodiment, the current state of charge value Greater than or equal to the minimum value And less than the target charge value That is, if Solve for the operating power adjustment value The specific process is as follows:

[0112] Based on the first value and the second charge difference Multiply to obtain the current operating power adjustment value. Second charge difference For the target value of charge Compared with the current state of charge value The difference, the first value is the first adjustment coefficient. The opposite number;

[0113] Right now: .

[0114] Understandably, in this situation, the current operating power adjustment value It is the state of charge value of the energy storage battery at the current moment. A small adjustment that moves the device closer to the target charge value, and the current operating power adjustment value. It is a negative value.

[0115] S423: In response to the current state of charge (SOC) value of the energy storage battery being greater than the maximum value of the desired charge range, calculate the operating power adjustment value at the current moment based on the current SOC value, the target charge value, the maximum value, the first adjustment coefficient, and the second adjustment coefficient.

[0116] In this embodiment of the invention, the first adjustment coefficient Less than the second adjustment coefficient Second adjustment coefficient The value is a second preset multiple of the rated power of the electrolytic cell, such as 1%, 2%, or any other suitable value.

[0117] In this embodiment of the invention, the first adjustment coefficient Second adjustment coefficient The regression rate of the state of charge (SOC) value of the energy storage battery at the current moment and the fluctuation range of the electrolyzer's operating power need to be determined using actual test data to establish the first adjustment coefficient. Second adjustment coefficient The final value is determined, and the fixed first adjustment coefficient is used. Second adjustment coefficient Calculate the operating power adjustment value at the current moment. .

[0118] In this embodiment of the invention, when the current state of charge value of the energy storage battery... Greater than the maximum value of the desired charge range When the battery is overcharged, the electrolytic cell's operating power is increased to consume more of the photovoltaic module's generated energy, thereby reducing the charging pressure on the battery. This is determined based on the battery's current state of charge (SOC). Target value of charge The maximum value of the desired charge range First adjustment coefficient and the second adjustment coefficient Calculate the operating power adjustment value at the current moment.

[0119] In one embodiment, if the current state of charge value of the energy storage battery... Greater than the maximum value of the desired charge range That is, if Solve for the operating power adjustment value The specific process is as follows:

[0120] Based on the first adjustment coefficient Difference from the first charge Multiply to obtain the first power value. Among them, the first charge difference The current state of charge value With target charge value The difference;

[0121] Right now: .

[0122] Based on the second adjustment coefficient Difference with the third charge Multiply to obtain the second power value. Among them, the third charge difference The current state of charge value With the maximum value The difference;

[0123] Right now: .

[0124] Based on the first power value With the second power value Summing these values ​​yields the current operating power adjustment value. ;

[0125] Right now: .

[0126] Understandably, in this situation, the current operating power adjustment value It is the state of charge value of the energy storage battery at the current moment. The adjustment amount that moves the device closer to the desired charge range, and the current operating power adjustment value. It is a positive value. This represents the current operating power adjustment value under this condition. Used for long-term energy dispatch to prevent energy storage batteries from entering an extreme SOC state (i.e., fully charged state) due to cumulative charging.

[0127] S424: In response to the fact that the state of charge of the energy storage battery at the current moment is less than the minimum value of the desired charge range, calculate the operating power adjustment value at the current moment based on the state of charge value at the current moment, the target charge value, the minimum value, the first adjustment coefficient, and the second adjustment coefficient.

[0128] In this embodiment of the invention, when the current state of charge value of the energy storage battery... Less than the minimum value of the desired charge range When the battery discharges excessively, the electrolytic cell's operating power is reduced to recharge the battery and allow it to draw energy from the photovoltaic modules. This process is based on the battery's current state of charge (SOC). Target value of charge Minimum value of the desired charge range First adjustment coefficient and the second adjustment coefficient Calculate the operating power adjustment value at the current moment.

[0129] In one embodiment, if the current state of charge value of the energy storage battery... Less than the minimum value of the desired charge range That is, if Solve for the operating power adjustment value The specific process is as follows:

[0130] Based on the first value and the second charge difference Multiply to obtain the third power value Second charge difference For the target value of charge Compared with the current state of charge value The difference;

[0131] Right now: .

[0132] Based on the difference between the second and fourth charge values Multiply to obtain the fourth power value The fourth charge difference Minimum value Compared with the current state of charge value The difference, the second value is the second adjustment coefficient. The opposite number;

[0133] Right now: .

[0134] Based on the third power value With the fourth power value Summing these values ​​yields the current operating power adjustment value. :

[0135] Right now: .

[0136] Understandably, in this situation, the current operating power adjustment value It is the state of charge value of the energy storage battery at the current moment. The adjustment amount that moves the device closer to the desired charge range, and the current operating power adjustment value. A negative value indicates the current operating power adjustment value in this case. Used for long-term energy dispatch to prevent energy storage batteries from accumulating discharge and entering an extreme SOC state (i.e., a discharged state).

[0137] Please see Figure 6 , Figure 6 The diagram illustrates the relationship between the current operating power adjustment value of the electrolyzer and the current state of charge value of the energy storage battery.

[0138] according to Figure 6 First, the target operating area / target working zone (i.e., the desired charge range) is set to be the healthier operating area of ​​the energy storage battery, allowing it to both discharge and charge. Second, when the energy storage battery is in a high or low SOC region, to quickly adjust to the target operating area and achieve minor adjustments within that area, the first adjustment coefficient... Second adjustment coefficient The value must satisfy the following conditions when setting it: Less than That is, when the SOC of the energy storage battery is within the desired charge range At this point, the energy storage battery is already operating within a reasonable charge range. corresponding The value (i.e., the current operating power adjustment value) will be compared to corresponding The value is relatively small, thus enabling fine-tuning within the desired charge range. Furthermore, when the energy storage battery is outside the target operating region, The value (i.e., the current operating power adjustment value) includes the first adjustment coefficient. Second adjustment coefficient The weighted summation is used to prevent the electrolyzer's operating power adjustment value from occurring at the junction of the target working area and the high SOC area or at the junction of the target working area and the low SOC area. Appearance Figure 7 The jump problem shown (i.e. Figure 7 In the high SOC region starting from point A with a state of charge of 60%, the operating power regulation value is represented by curve L1. The jump to the operating power adjustment value represented by curve L3 Alternatively, the operating power regulation value represented by curve L2, starting from point B where the state of charge (SOC) is 40%. The jump to the operating power adjustment value represented by curve L4. According to the embodiments of the present invention, the rated power and target charge value of the electrolytic cell are used as the basis for the invention. and the current state of charge (SOC) value of the energy storage battery. Calculate the first adjustment coefficient dynamically and accurately. Second adjustment coefficient .

[0139] exist Figure 6 and Figure 7 In this context, the lower limit of state of charge (SOC) refers to the minimum value of the desired charge range. The upper limit of SOC refers to the maximum value of the expected charge range. SOC target value refers to the target value of charge. (That is, any charge value within the desired charge range, which is taken as a value in this embodiment) The target operating area refers to the state of charge (SOC) range of an energy storage battery during operation. Figure 6 and Figure 7 It is based on using a fixed first adjustment coefficient. Second adjustment coefficient Calculated operating power adjustment value at the current moment The resulting curve.

[0140] In the above embodiments, the operating power adjustment value at the current moment is calculated. In several different situations, the first adjustment coefficient Second adjustment coefficient A calculated fixed value can be used. In other embodiments, the operating power adjustment value at the current moment is calculated. In several different situations, the current state of charge value can be used as a reference. The first adjustment coefficient is calculated dynamically according to the specific circumstances. Second adjustment coefficient So that the calculated current operating power adjustment value of the electrolyzer can be adjusted. It is smoother and more fluid.

[0141] In some embodiments, the power control method for a photovoltaic hydrogen storage system provided by the present invention further includes, but is not limited to, the following step S42A:

[0142] S42A: Determine the first adjustment coefficient and the second adjustment coefficient based on the rated power of the electrolyzer, the target charge value, and the current state of charge value of the energy storage battery.

[0143] In one embodiment, for the rated power based on the electrolyzer The target charge value and the current state of charge value of the energy storage battery. The first adjustment coefficient is dynamically calculated and determined. Second adjustment coefficient The specific process is as follows:

[0144] Determine the current state of charge. and target value of charge absolute difference ;

[0145] Right now: .

[0146] Based on absolute difference and target value of charge The quotient determines the ratio. ;

[0147] Right now: .

[0148] Based on the rated power of the electrolytic cell and the first preset ratio value The product of the first coefficient is used to determine the first coefficient. ;

[0149] Right now: .

[0150] Based on the rated power of the electrolytic cell Second preset ratio value The product of and determines the second coefficient. Among them, the first preset ratio value Second preset ratio value All are greater than 0, and the first preset ratio value Less than the second preset ratio value In this embodiment, the first preset ratio value For the range of values Any value in the second preset ratio value For the range of values Any value in the range.

[0151] Right now: .

[0152] Based on ratio and the first coefficient The product of these factors determines the first adjustment coefficient. ;

[0153] Right now: .

[0154] Based on ratio Second coefficient The product of these factors determines the second adjustment coefficient. ;

[0155] Right now: .

[0156] For example, please see Figure 8 , Figure 8 The diagram schematically illustrates the relationship between the current operating power adjustment value of the electrolyzer and the current state of charge value of the energy storage battery. Figure 8 The curve shown is based on the rated power of the electrolytic cell. Target value of charge and the current state of charge (SOC) value of the energy storage battery. The first adjustment coefficient is determined dynamically. Second adjustment coefficient The operating power adjustment value at the current moment is obtained through calculation. The drawing, based on Figure 8 The first adjustment coefficient is dynamically determined using the embodiments of the present invention. Second adjustment coefficient This method can obtain a smoother and more consistent adjustment of the electrolyzer's operating power at the current moment. The current state of charge (SOC) of the energy storage battery The corresponding curve allows for a smoother and more stable adjustment of the target operating power value of the electrolyzer. .

[0157] S43: Determine the target operating power value of the electrolytic cell based on the current photovoltaic power generation and the current operating power adjustment value.

[0158] For example, the photovoltaic power generation at the current moment Power adjustment value at the current moment Adding them together, we obtain the target operating power value of the electrolytic cell. ,Right now: It is understandable that the target operating power value of the electrolytic cell is... It needs to be limited to the operating power range of the electrolyzer, that is, the target operating power value of the electrolyzer. Greater than or equal to the lower limit of the electrolytic cell's operating power And less than or equal to the upper limit of the working power of the electrolytic cell. .

[0159] In some embodiments, after determining the target operating power value of the electrolyzer, the power control method for the photovoltaic hydrogen storage system further includes, but is not limited to, the following step S44:

[0160] S44: Gradually adjust the operating power of the electrolytic cell to the target operating power value during at least one adjustment cycle. .

[0161] Among them, the target operating power value of the electrolytic cell is obtained. Subsequently, to avoid the impact of sudden power changes on the electrolytic cell, the target operating power value of the electrolytic cell was set. A gradual change process is implemented. Specifically, a power change threshold is set. (For example, not exceeding 5% of the electrolyzer's rated power per second), calculate the current actual power of the electrolyzer during each power adjustment cycle. With the target operating power value The difference If the difference Exceeding the power change threshold Allowable range (i.e., difference) Greater than the power change threshold Then, according to the power change threshold Gradually adjust the operating power of the electrolytic cell so that it gradually approaches the target operating power value. If the difference At the power change threshold Within the allowable range (i.e., the difference) Less than or equal to the power change threshold If so, the operating power of the electrolytic cell will be directly adjusted to the target operating power value. .

[0162] The aforementioned power variation control ensures a smooth change in the electrolytic cell's operating power, protecting it from damage caused by sudden power fluctuations and improving system stability and reliability. It should be understood that the power variation threshold... Related to the performance parameters of the electrolytic cell itself, the change in the operating power of the electrolytic cell per second is not allowed to exceed the power threshold (i.e., the power change threshold). In some embodiments, the power change threshold Set as the rated power of the electrolytic cell The preset multiple value, such as 1.2%, is used to set the power change threshold. 1.2% × rated power of the electrolytic cell .

[0163] In one embodiment, the operating power of the electrolyzer is gradually adjusted to the target operating power value during at least one adjustment cycle. The specific process is as follows:

[0164] Obtain the actual operating power of the electrolyzer at the current moment. and the target operating power value at the current moment absolute power difference ;

[0165] Right now: .

[0166] When the absolute power difference at the current moment Greater than the power change threshold At that time, that is At that time, based on the power change threshold and the actual operating power at the current moment The sum of these values ​​represents the adjusted operating power of the electrolyzer during the current adjustment cycle. ,Right now: .

[0167] When the absolute power difference at the current moment Less than or equal to the power change threshold At that time, that is At that time, adjust the working power of the electrolytic cell to the target working power value. .

[0168] In general, the embodiments of the present invention have at least the following significant beneficial effects:

[0169] 1. Significantly Reduced Battery Capacity and Cost of Photovoltaic-Hydrogen Storage Systems: Because the control strategy automatically maintains the battery's State of Charge (SOC) within the desired range, the battery only needs to handle short-term power fluctuations, eliminating the need to store hours' worth of electricity generated by the photovoltaic modules. This significantly reduces the required battery capacity, substantially lowering the cost of the most expensive component in photovoltaic-hydrogen storage systems. (See also...) Figure 9a and Figure 9b As shown, the operating conditions are basically the same when the energy storage battery capacity is 10kWh and 5kWh. Figure 9a and Figure 9b In this context, the upper limit of electrolytic cell power refers to the upper limit of the electrolytic cell's operating power. The lower limit of electrolytic cell power refers to the lower limit of the operating power of the electrolytic cell. The SOC upper limit refers to the maximum value of the expected charge range of an energy storage battery. The lower limit of state of charge (SOC) refers to the minimum value of the expected charge range of an energy storage battery. .

[0170] 2. Optimize system operation and extend equipment life:

[0171] For energy storage batteries: Active control prevents the battery from entering extreme operating conditions such as "no-charge" (i.e., overcharging, full charging) or "no-discharge" (i.e., over-discharging, emptying), reducing deep charge-discharge cycles and effectively extending the battery's lifespan. See also... Figure 10a and Figure 10b As shown, when the SOC of the energy storage battery deviates from the desired charge range (i.e., the middle charge range) When the power is adjusted, the SOC of the energy storage battery returns to the desired charge range. Figure 10a and Figure 10b In this context, the upper limit of electrolytic cell power refers to the upper limit of the electrolytic cell's operating power. The lower limit of electrolytic cell power refers to the lower limit of the operating power of the electrolytic cell. The SOC upper limit refers to the maximum value of the expected charge range of an energy storage battery. The lower limit of state of charge (SOC) refers to the minimum value of the expected charge range of an energy storage battery. .

[0172] For electrolyzers: Compared to direct photovoltaic (PV) power tracking, power command fluctuations after smoothing filtering are smoother, reducing power stress on the electrolyzer. If PV power is not smoothed, the PV power curve will exhibit spikes and glitches. Since the electrolyzer's operating power follows the PV power, this would result in an uneven, non-smooth operating power curve. After smoothing filtering, the PV power curve becomes smoother, allowing the electrolyzer's operating power to change smoothly, thus reducing power stress. Compared to completely smooth power supply (where the electrolyzer's operating power remains at a fixed value), this approach maintains necessary power variation flexibility, which is beneficial for improving adaptability and direct PV absorption rate. See also... Figure 10c As shown, the short-term photovoltaic power generation fluctuates significantly, while the operating power of the electrolytic cell remains stable. Figure 10c In this context, the SOC upper limit refers to the maximum value of the expected charge range of an energy storage battery. The lower limit of state of charge (SOC) refers to the minimum value of the expected charge range of an energy storage battery. .

[0173] 3. Improve the direct utilization rate of photovoltaic power generation and the operating efficiency of photovoltaic hydrogen storage system: The working power of the electrolyzer mainly follows the change of photovoltaic power generation, realizing the direct coupling of the "generation-use" end, reducing the two conversion losses in the "storage-release" process of energy in the energy storage battery, and improving the overall energy efficiency of the system.

[0174] 4. Simple control logic, easy to implement in engineering: No need for complex power prediction models and optimization algorithms, low computational load, high reliability, easy to implement on existing PLC controllers, embedded controllers and other hardware platforms.

[0175] This invention provides a computer-readable storage medium storing processor-executable computer program instructions. When executed by a processor, the computer program instructions cause the computer to perform any of the power control methods for a photovoltaic hydrogen storage system provided in this invention, or to perform the steps in any possible implementation of any of the power control methods for a photovoltaic hydrogen storage system provided in this invention.

[0176] Those skilled in the art will understand that the embodiments provided by this invention are merely illustrative. The order in which the steps in the methods of the embodiments are written does not imply a strict execution order and does not constitute any limitation on the implementation process. The order can be adjusted, merged, and deleted according to actual needs. Modules or sub-modules, units or sub-units in the apparatus or system of the embodiments can be merged, divided, and deleted according to actual needs. For example, the division of units is only a logical functional division, and there may be other division methods in actual implementation. For another example, multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed.

[0177] Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented using software plus a general-purpose hardware platform, and of course, it can also be implemented using hardware. Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. This computer program can be stored in a computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. It should be understood that the storage medium can be flash memory, hard disk, optical disk, register, magnetic surface memory, removable disk, CD-ROM, random access memory (RAM), read-only memory (ROM), electrically programmable ROM, and electrically erasable programmable ROM, etc.

[0178] It should be noted that the above embodiments are for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. Those skilled in the art can understand that all or part of the processes of the above embodiments can be implemented by modifying the technical solutions described in the embodiments of the present invention, or by making equivalent substitutions for some of the technical features. It is understood that these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and should be considered as equivalent changes and modifications made based on the embodiments of the present invention, all of which should fall within the scope of the claims of the present invention.

Claims

1. A power control method for a photovoltaic hydrogen storage system, characterized in that, include: The output power of the photovoltaic module at the current moment is filtered to obtain the photovoltaic power generation power of the photovoltaic module at the current moment; Based on the current state of charge (SOC) value of the energy storage battery and a preset desired SOC range for the energy storage battery, the operating power adjustment value of the electrolyzer at the current moment is determined, including: determining a target SOC value for the energy storage battery based on the desired SOC range; in response to the current SOC value of the energy storage battery being within the desired SOC range, calculating the operating power adjustment value at the current moment based on the current SOC value, the target SOC value, and a first adjustment coefficient; in response to the current SOC value of the energy storage battery being greater than the maximum value of the desired SOC range, calculating the operating power adjustment value at the current moment based on the current SOC value, the target SOC value, the maximum value, the first adjustment coefficient, and a second adjustment coefficient; in response to the current SOC value of the energy storage battery being less than the minimum value of the desired SOC range, calculating the operating power adjustment value at the current moment based on the current SOC value, the target SOC value, the minimum value, the first adjustment coefficient, and the second adjustment coefficient; wherein, the first adjustment coefficient is less than the second adjustment coefficient; The target operating power value of the electrolytic cell is determined based on the current photovoltaic power generation and the current operating power adjustment value.

2. The power control method for a photovoltaic hydrogen storage system according to claim 1, characterized in that, The response is that the state of charge (SOC) value of the energy storage battery at the current moment is within the desired charge range. The calculation of the operating power adjustment value at the current moment, based on the SOC value, the target charge value, and the first adjustment coefficient, includes: When the state of charge value at the current moment is greater than the target value of charge and less than or equal to the maximum value, the operating power adjustment value at the current moment is obtained based on the product of the first adjustment coefficient and the first charge difference, wherein the first charge difference is the difference between the state of charge value at the current moment and the target value of charge; When the state of charge value at the current moment is greater than or equal to the minimum value and less than the target value of charge, the operating power adjustment value at the current moment is obtained based on the product of the first value and the second charge difference. The second charge difference is the difference between the target value of charge and the state of charge value at the current moment, and the first value is the opposite of the first adjustment coefficient.

3. The power control method for a photovoltaic hydrogen storage system according to claim 1, characterized in that, The response is that the state of charge (SOC) value of the energy storage battery at the current moment is greater than the maximum value of the desired charge range. Based on the SOC value at the current moment, the target charge value, the maximum value, the first adjustment coefficient, and the second adjustment coefficient, the calculation of the operating power adjustment value at the current moment includes: A first power value is obtained based on the product of the first adjustment coefficient and the first charge difference, wherein the first charge difference is the difference between the charge state value at the current moment and the charge target value. The second power value is obtained by multiplying the second adjustment coefficient and the third charge difference, wherein the third charge difference is the difference between the current state of charge value and the maximum value. The operating power adjustment value at the current moment is obtained by summing the first power value and the second power value.

4. The power control method for a photovoltaic hydrogen storage system according to claim 1, characterized in that, The response is that the state of charge (SOC) value of the energy storage battery at the current moment is less than the minimum value of the desired charge range. Based on the SOC value at the current moment, the target charge value, the minimum value, the first adjustment coefficient, and the second adjustment coefficient, the calculation of the operating power adjustment value at the current moment includes: A third power value is obtained by multiplying the first value and the second charge difference, where the second charge difference is the difference between the target charge value and the current state of charge value, and the first value is the opposite of the first adjustment coefficient. A fourth power value is obtained by multiplying the second value and the fourth charge difference, wherein the fourth charge difference is the difference between the minimum value and the state of charge value at the current time, and the second value is the opposite of the second adjustment coefficient. The operating power adjustment value at the current moment is obtained by summing the third power value and the fourth power value.

5. The power control method for a photovoltaic hydrogen storage system according to any one of claims 1-4, characterized in that, The method further includes: The first adjustment coefficient and the second adjustment coefficient are determined based on the rated power of the electrolytic cell, the target charge value, and the current state of charge value of the energy storage battery.

6. The power control method for a photovoltaic hydrogen storage system according to claim 5, characterized in that, The determination of the first adjustment coefficient and the second adjustment coefficient based on the rated power of the electrolyzer, the target charge value, and the current state of charge value of the energy storage battery includes: Determine the absolute difference between the current state of charge value and the target state of charge value; The ratio is determined based on the quotient of the absolute difference and the target charge value; The first coefficient is determined based on the product of the rated power of the electrolytic cell and the first preset ratio value; The second coefficient is determined based on the product of the rated power of the electrolytic cell and the second preset ratio value; The first adjustment coefficient is determined based on the product of the ratio and the first coefficient; The second adjustment coefficient is determined based on the product of the ratio and the second coefficient; Wherein, both the first preset ratio value and the second preset ratio value are greater than 0, and the first preset ratio value is less than the second preset ratio value.

7. The power control method for a photovoltaic hydrogen storage system according to any one of claims 1-4, characterized in that, After determining the target operating power value of the electrolytic cell, the method further includes: gradually adjusting the operating power of the electrolytic cell to the target operating power value during at least one adjustment cycle, including: Obtain the absolute power difference between the actual operating power of the electrolytic cell at the current moment and the target operating power value at the current moment; When the absolute power difference at the current moment is greater than the power change threshold, the sum of the power change threshold and the actual working power at the current moment shall be used as the adjusted working power of the electrolytic cell in the current adjustment cycle. When the absolute power difference at the current moment is less than or equal to the power change threshold, the working power of the electrolytic cell is adjusted to the target working power value.

8. The power control method for a photovoltaic hydrogen storage system according to any one of claims 1-4, characterized in that, The step of filtering the output power of the photovoltaic module at the current moment to obtain the photovoltaic power generation of the photovoltaic module at the current moment includes: Obtain the N photovoltaic power generation capacities of the photovoltaic module for the N moments prior to the current moment; Calculate the average of the N photovoltaic power generation capacities and the output power of the photovoltaic module at the current moment to obtain the photovoltaic power generation capacity at the current moment.

9. A photoelectric hydrogen storage system, characterized in that, include: A DC-DC converter and a photovoltaic module, energy storage battery and electrolytic cell connected to the DC-DC converter; The processor, connected to the photovoltaic module, the energy storage battery, and the electrolyzer, is used to acquire the output power of the photovoltaic module, the state of charge value of the energy storage battery, and the operating power of the electrolyzer, and to execute the power control method of the photovoltaic hydrogen storage system as described in any one of claims 1 to 8.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores processor-executable computer program instructions, which, when executed by the processor, cause the computer to perform the power control method for the photovoltaic hydrogen storage system as described in any one of claims 1 to 8.

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