Humidity control method and device for hydrogen fuel cell power generation system

Abstract

The present application relates to a humidity control method and device for a hydrogen fuel cell power generation system, which is applied to the field of fuel cell technology. The method includes: after starting the startup program, setting the operating current density of the hydrogen fuel cell power generation system in real time according to the power demand of the hydrogen fuel cell power generation system, and setting the current density corresponding to the idle power to a first current density; if the operating current density of the hydrogen fuel cell power generation system is less than or equal to a preset high current density, setting the air inlet pressure to be greater than the hydrogen inlet pressure; if the operating current density is greater than the preset high current density, setting the hydrogen inlet pressure to be greater than the air inlet pressure; before starting the shutdown program, reducing the operating current density to the first current density, setting the hydrogen inlet pressure to be greater than the air inlet pressure, and starting the shutdown program after continuously running for a period greater than or equal to a preset time period. The present application can ensure that a high humidity is maintained inside the fuel cell stack at low current density.

Description

Technical Field

[0001] The present application relates to the field of fuel cell technology, and in particular to a humidity control method and device for a hydrogen fuel cell power generation system. Background Art

[0002] As a highly efficient and clean energy conversion technology, hydrogen fuel cell power generation systems hold broad application prospects in transportation, distributed power generation, and other fields. They directly convert the chemical energy of hydrogen and oxygen into electricity through an electrochemical reaction, emitting only water, offering advantages such as zero pollution and high efficiency. In recent years, hydrogen fuel cell technology has developed rapidly, particularly in heavy-duty trucks, buses, and stationary power generation systems.

[0003] However, hydrogen fuel cell power generation systems still face many challenges in actual operation, especially under low current density operating conditions, where the problem of humidity management inside the stack is particularly prominent. During low-power operation, due to the small amount of water generated by the electrochemical reaction, the membrane electrodes inside the stack are easily dried out due to insufficient humidity, resulting in a decrease in the proton conductivity of the proton exchange membrane and an increase in the internal resistance of the battery, which in turn causes performance degradation and shortened life. At the same time, uneven humidity may also cause an increase in the voltage deviation of a single cell, further exacerbating the unevenness of the stack. At present, traditional humidity control methods mainly rely on external humidification or exhaust gas circulation, but the system is complex and has high energy consumption, making it difficult to achieve precise control over a wide power range. Summary of the Invention

[0004] In order to solve the above technical problems, the present application provides a humidity control method, device, electronic device and storage medium for a hydrogen fuel cell power generation system.

[0005] According to a first aspect of the present application, a humidity control method for a hydrogen fuel cell power generation system is provided, comprising:

[0006] After starting the startup program, setting the operating current density of the hydrogen fuel cell power generation system in real time according to the power demand of the hydrogen fuel cell power generation system, and setting the current density corresponding to the idle power as the first current density;

[0007] detecting whether an operating current density of the hydrogen fuel cell power generation system is greater than a preset high current density; the preset high current density is greater than the first current density;

[0008] If the operating current density is less than or equal to the preset high current density, setting the air inlet pressure to be greater than the hydrogen inlet pressure;

[0009] If the operating current density is greater than the preset high current density, setting the hydrogen inlet pressure to be greater than the air inlet pressure;

[0010] Before starting the shutdown procedure, the operating current density is reduced to the first current density, the hydrogen inlet pressure is set to be greater than the air inlet pressure, and the shutdown procedure is started after continuous operation for a period greater than or equal to a preset time period.

[0011] Optionally, the humidity control method of the hydrogen fuel cell power generation system further includes:

[0012] If the operating current density is less than or equal to the preset high current density, the maximum cross pressure of air and hydrogen is set according to the interval range of the operating current density; the maximum cross pressure decreases as the interval range increases;

[0013] If the operating current density is greater than the preset high current density, the maximum crossover pressure is set to the first pressure;

[0014] Before initiating the shutdown procedure, the maximum crossover pressure is set to a second pressure; the second pressure is greater than the first pressure.

[0015] Optionally, setting the maximum cross pressure of air and hydrogen according to the interval range of the operating current density includes:

[0016] If the operating current density is less than or equal to the first current density, setting the maximum cross pressure of air and hydrogen to a third pressure; the third pressure is greater than the second pressure;

[0017] If the operating current density is greater than the first current density and less than or equal to the second current density, setting the maximum cross pressure of air and hydrogen to the second pressure;

[0018] If the operating current density is greater than the second current density and less than or equal to the preset high current density, the maximum cross pressure of air and hydrogen is set to the first pressure.

[0019] Optionally, after setting the maximum cross pressure of air and hydrogen according to the interval range of the operating current density, the method further includes:

[0020] If the operating current density is greater than the first current density and less than or equal to a preset high current density, calculating the voltage deviation of the stack according to the voltage value of the single chip of the stack;

[0021] When the voltage deviation is greater than a preset deviation, the maximum cross pressure is increased.

[0022] Optionally, when the voltage deviation is greater than a preset deviation, increasing the maximum cross pressure includes:

[0023] If the operating current density is greater than the first current density and less than or equal to the second current density, and if the voltage deviation is greater than a first preset deviation, increasing the maximum cross pressure of air and hydrogen;

[0024] If the operating current density is greater than the second current density and less than or equal to the preset high current density, the maximum cross pressure of air and hydrogen is increased when the voltage deviation is greater than the second preset deviation, and the second preset deviation is greater than the first preset deviation.

[0025] According to a second aspect of the present application, a humidity control device for a hydrogen fuel cell power generation system is provided, comprising:

[0026] a current density setting module, configured to set the operating current density of the hydrogen fuel cell power generation system in real time according to the power demand of the hydrogen fuel cell power generation system after starting the startup program, and set the current density corresponding to the idle power as a first current density;

[0027] a current density determination module, configured to detect whether the operating current density of the hydrogen fuel cell power generation system is greater than a preset high current density; the preset high current density is greater than the first current density;

[0028] a first inlet pressure setting module, configured to set the air inlet pressure to be greater than the hydrogen inlet pressure if the operating current density is less than or equal to a preset high current density;

[0029] a second inlet pressure setting module, configured to set the hydrogen inlet pressure to be greater than the air inlet pressure if the operating current density is greater than a preset high current density;

[0030] The shutdown setting module is used to reduce the operating current density to the first current density before starting the shutdown program, set the hydrogen inlet pressure to be greater than the air inlet pressure, and start the shutdown program after continuous operation for a period greater than or equal to a preset time period.

[0031] Optionally, the humidity control device of the hydrogen fuel cell power generation system further includes:

[0032] a post-startup maximum cross pressure setting module, configured to set the maximum cross pressure of air and hydrogen according to the range of the operating current density if the operating current density is less than or equal to a preset high current density; the maximum cross pressure decreases as the range increases; and if the operating current density is greater than the preset high current density, the maximum cross pressure is set to the first pressure;

[0033] The maximum cross pressure setting module before shutdown is used to set the maximum cross pressure to a second pressure before starting the shutdown program; the second pressure is greater than the first pressure.

[0034] Optionally, the maximum cross pressure setting module after startup is specifically used to, after setting the operating current density of the hydrogen fuel cell power generation system, if the operating current density is less than or equal to the first current density, set the maximum cross pressure of air and hydrogen to a third pressure; the third pressure is greater than the second pressure; if the operating current density is greater than the first current density and less than or equal to the second current density, set the maximum cross pressure of air and hydrogen to the second pressure; if the operating current density is greater than the second current density and less than or equal to the preset high current density, set the maximum cross pressure of air and hydrogen to the first pressure.

[0035] Optionally, the humidity control device of the hydrogen fuel cell power generation system further includes:

[0036] a voltage deviation calculation module, configured to calculate the voltage deviation of the stack based on the voltage value of the stack cell if the operating current density is greater than the first current density and less than or equal to a preset high current density;

[0037] The maximum cross pressure increasing module is configured to increase the maximum cross pressure when the voltage deviation is greater than a preset deviation.

[0038] Optionally, the maximum cross-pressure increasing module is specifically used to increase the maximum cross-pressure of air and hydrogen if the operating current density is greater than the first current density and less than or equal to the second current density, and the voltage deviation is greater than a first preset deviation; if the operating current density is greater than the second current density and less than or equal to the preset high current density, the maximum cross-pressure of air and hydrogen is increased if the voltage deviation is greater than a second preset deviation, and the second preset deviation is greater than the first preset deviation.

[0039] According to a third aspect of the present application, an electronic device is provided, comprising: a processor, wherein the processor is configured to execute a computer program stored in a memory, wherein the computer program implements the method described in the first aspect when executed by the processor.

[0040] According to a fourth aspect of the present application, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the method described in the first aspect is implemented.

[0041] According to a fifth aspect of the present application, a computer program product is provided. When the computer program product is run on a computer, the computer is caused to execute the method described in the first aspect.

[0042] The technical solution provided by the embodiments of the present application has the following advantages compared with the prior art:

[0043] At low current densities, the stack cathode produces relatively little water. If the anode pressure is greater than the cathode pressure, the water is difficult to diffuse back to the anode and is essentially carried out of the stack by air, resulting in low humidity. Therefore, when the operating current density of the hydrogen fuel cell power generation system is detected to be low, setting the air inlet pressure to be greater than the hydrogen inlet pressure (i.e., the cathode pressure is greater than the anode pressure) can enhance the diffusion of water generated by the cathode to the anode, thereby increasing the operating humidity of the stack. This in turn reduces the resistance of the proton exchange membrane to proton transfer, improving the performance output of the fuel cell power generation system. It also prevents rapid degradation of the stack performance and extends its service life. Reducing the current density to the current density corresponding to idle power before shutdown and maintaining it for at least a preset period of time (e.g., 30 seconds) ensures a smooth transition of the stack and avoids material stress damage caused by sudden shutdown. Setting the anode pressure to be greater than the cathode pressure prevents air diffusion to the anode, forming a hydrogen-air interface at the anode, and causing irreversible damage to stack components. The control strategy of the present embodiment can be flexibly adjusted to the power requirements of different fuel cell systems, making it suitable for a variety of scenarios, including automotive and stationary power generation, and offering strong compatibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0045] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0046] Figure 1 This is a flow chart of a humidity control method for a hydrogen fuel cell power generation system in an embodiment of the present application;

[0047] Figure 2 This is another flow chart of the humidity control method of the hydrogen fuel cell power generation system in the embodiment of the present application;

[0048] Figure 3 This is a structural schematic diagram of a humidity control device for a hydrogen fuel cell power generation system in an embodiment of the present application. DETAILED DESCRIPTION

[0049] In order to more clearly understand the above-mentioned objectives, features and advantages of the present application, the scheme of the present application will be further described below. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0050] In the following description, many specific details are set forth to facilitate a full understanding of the present application, but the present application can also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present application, not all of the embodiments.

[0051] See also Figure 1 , Figure 1 This is a flow chart of a humidity control method for a hydrogen fuel cell power generation system according to an embodiment of the present application, which may include the following steps:

[0052] Step S102 , after starting the startup program, setting the operating current density of the hydrogen fuel cell power generation system in real time according to the power demand of the hydrogen fuel cell power generation system, and setting the current density corresponding to the idle power as the first current density.

[0053] After the hydrogen fuel cell power generation system initiates the startup sequence, the operating current density can be set based on the actual power requirements. This operating current density can be continuously adjusted based on the power requirements. Within the peak power range, the operating current density is positively correlated with power; higher power levels result in higher operating current density. The current density corresponding to idle power is set as the first current density. Idle power is typically lower, so the first current density is also lower. Different products have different corresponding idle powers, and therefore, different first current densities.

[0054] When the hydrogen fuel cell power generation system is started, the current density will be lower than the first current density. After that, according to the actual power demand, the operating current density will continue to increase, and the operating current density of the hydrogen fuel cell power generation system will be greater than or equal to the first current density.

[0055] Step S104 , detecting whether the operating current density of the hydrogen fuel cell power generation system is greater than a preset high current density.

[0056] The operating current density of the hydrogen fuel cell power generation system is constantly changing. During low power (i.e. low current density) operation, the stack will become too dry, which will increase the resistance of the proton exchange membrane to transfer protons, affecting the performance output of the fuel cell power generation system. At the same time, long-term use will accelerate the performance degradation of the hydrogen fuel cell stack, affecting its service life. Therefore, during the operation of the hydrogen fuel cell power generation system, it is possible to detect in real time whether the operating current density of the hydrogen fuel cell power generation system is greater than the preset high current density (e.g. 1.0A / cm 2 ), the preset high current density is a preset higher current density, and the preset high current density is greater than the first current density. If the operating current density is less than or equal to the preset high current density, it is considered that the hydrogen fuel cell power generation system is operating at low power, and step S106 is executed; if the operating current density is greater than the preset high current density, it is considered that the hydrogen fuel cell power generation system is operating at high power, and step S108 is executed.

[0057] Step S106: setting the inlet pressure of air to be greater than the inlet pressure of hydrogen.

[0058] At low current density, setting the air inlet pressure higher than the hydrogen inlet pressure, that is, the cathode pressure higher than the anode pressure, can increase the diffusion of water generated by the cathode to the anode, increase the operating humidity of the fuel cell stack, and thus reduce the resistance of the proton exchange membrane to proton transfer, improving the performance output of the fuel cell power generation system.

[0059] Step S108: setting the hydrogen inlet pressure to be greater than the air inlet pressure.

[0060] At high current densities, the stack generates more water. Therefore, it is not necessary to set the air inlet pressure higher than the hydrogen inlet pressure to ensure reverse diffusion of water and maintain stack humidity. Since high power requires more air and the membrane becomes more moist, to prevent air from diffusing from the cathode to the anode, the hydrogen inlet pressure should be higher than the air inlet pressure, meaning the anode pressure is higher than the cathode pressure.

[0061] Step S110, before starting the shutdown procedure, the operating current density is reduced to a first current density, the hydrogen inlet pressure is set to be greater than the air inlet pressure, and after continuous operation for a period greater than or equal to a preset time period, the shutdown procedure is started.

[0062] Reducing the current density to that corresponding to the idle power before shutdown and maintaining it for at least a preset time period (e.g., 30 seconds) can ensure a smooth transition of the fuel cell stack and avoid material stress damage caused by sudden shutdown. At the same time, setting the anode pressure higher than the cathode pressure can avoid air diffusion to the anode and the formation of a hydrogen-air interface at the anode, which may cause irreversible damage to the fuel cell stack components.

[0063] The humidity control method for a hydrogen fuel cell power generation system in an embodiment of the present application sets the air inlet pressure to be greater than the hydrogen inlet pressure, i.e., the cathode pressure is greater than the anode pressure, when it detects that the operating current density of the hydrogen fuel cell power generation system is low. This increases the diffusion of water generated at the cathode to the anode, thereby increasing the operating humidity of the fuel cell stack. This, in turn, reduces the resistance of the proton exchange membrane to proton transfer, improving the performance output of the fuel cell power generation system. It also prevents rapid degradation of the fuel cell stack performance and extends its service life. Before shutdown, the current density is reduced to the current density corresponding to the idle power and maintained for at least a preset time period (e.g., 30 seconds). This ensures a smooth transition of the fuel cell stack and avoids material stress damage caused by sudden shutdown. Furthermore, setting the anode pressure to be greater than the cathode pressure prevents air from diffusing to the anode, forming a hydrogen-air interface at the anode, and causing irreversible damage to fuel cell stack components. The control strategy of the embodiment of the present application can be flexibly adjusted according to the power requirements of different fuel cell systems. It is suitable for a variety of scenarios, including automotive and stationary power generation, and has strong compatibility.

[0064] See also Figure 2 , Figure 2 This is another flow chart of a humidity control method for a hydrogen fuel cell power generation system according to an embodiment of the present application, which may include the following steps:

[0065] Step S202 , after starting the startup program, setting the operating current density of the hydrogen fuel cell power generation system in real time according to the power demand of the hydrogen fuel cell power generation system, and setting the current density corresponding to the idle power as the first current density.

[0066] Step S204 , detecting whether the operating current density of the hydrogen fuel cell power generation system is greater than a preset high current density; the preset high current density is greater than the first current density.

[0067] Steps S202 to S204 and Figure 1 Steps S102 to S104 in the embodiment are the same, see Figure 1 The description in the embodiment is sufficient and will not be repeated here.

[0068] If the operating current density is less than or equal to the preset high current density, step S206 is executed; if the operating current density is greater than the preset high current density, step S208 is executed.

[0069] Step S206 , setting the air inlet pressure to be greater than the hydrogen inlet pressure, and setting the maximum cross pressure of air and hydrogen according to the range of the operating current density.

[0070] Under low current density, in addition to setting the air inlet pressure to be greater than the hydrogen inlet pressure, the maximum cross pressure of air and hydrogen can also be set according to the range of the operating current density. The maximum cross pressure decreases as the range increases. By gradually tightening the maximum cross pressure, the risk of gas permeation can be reduced and the stability of the stack operation can be improved.

[0071] Optionally, if the operating current density is less than or equal to the first current density, the maximum cross pressure of air and hydrogen is set to a third pressure (e.g., 20 kPa). If the operating current density is greater than the first current density and less than or equal to the second current density, the maximum cross pressure of air and hydrogen is set to a second pressure (e.g., 10 kPa). The third pressure is greater than the second pressure. If the operating current density is greater than the second current density and less than or equal to the preset high current density, the maximum cross pressure of air and hydrogen is set to the first pressure (e.g., 5 kPa), and the second pressure is greater than the first pressure. Different gas pressure control strategies are adopted for the above three current density zones to ensure the stable performance output and reliable service life of the fuel cell under different power requirements.

[0072] Optionally, after setting the maximum cross pressure of air and hydrogen according to the range of the operating current density, if the operating current density is greater than the first current density and less than or equal to the preset high current density, the voltage deviation of the stack is calculated according to the single-chip voltage value of the stack, that is, the absolute value of the difference between the highest or lowest voltage of the single cell and the average single-chip voltage. When the voltage deviation is less than or equal to the preset deviation, the operation is continued. When the voltage deviation is greater than the preset deviation, the maximum cross pressure is increased. That is, in the medium power range, voltage deviation monitoring is introduced. When the voltage deviation exceeds the limit, the cross pressure limit is relaxed to ensure the back diffusion of cathode water to the anode, so as to ensure the humidity of the stack at low current density and slow down the life decay of the stack at low current density.

[0073] In some embodiments, if the operating current density is greater than the first current density and less than or equal to the second current density, when the voltage deviation is greater than the first preset deviation (e.g., 15mV), the maximum cross pressure of air and hydrogen is increased. For example, the pressure can be increased from the second pressure to the third pressure. If the operating current density is greater than the second current density and less than or equal to the preset high current density, when the voltage deviation is greater than the second preset deviation (e.g., 20mV), the maximum cross pressure of air and hydrogen is increased, for example, the pressure can be increased from the first pressure to the second pressure. The second preset deviation is greater than the first preset deviation, that is, within two specific current density ranges, as the current density range increases, the preset deviation also increases accordingly. The fault-tolerant control of the cross pressure is dynamically relaxed through voltage deviation feedback, thereby improving the performance consistency of the fuel cell stack.

[0074] Step S208 , setting the hydrogen inlet pressure to be greater than the air inlet pressure, and setting the maximum crossover pressure to the first pressure.

[0075] At high current density, in addition to setting the hydrogen inlet pressure to be greater than the air inlet pressure, the maximum crossover pressure may also be set to the first pressure.

[0076] Step S210, before starting the shutdown procedure, reduce the operating current density to the first current density, set the hydrogen inlet pressure to be greater than the air inlet pressure, set the maximum cross pressure to the second pressure, and start the shutdown procedure after running continuously for a period greater than or equal to the preset time period.

[0077] When the operating current density is greater than the second current density and less than or equal to the preset high current density, and when it is greater than the preset high current density, the maximum crossover pressure is set to the first pressure, that is, the maximum crossover pressure is lower. During the shutdown phase, in addition to setting the hydrogen inlet pressure greater than the air inlet pressure, the maximum crossover pressure can also be set to the second pressure, that is, relaxing the maximum crossover pressure. This can prevent air from diffusing into the anode to form a hydrogen-air interface, thereby reducing the irreversible degradation of the stack performance caused by the hydrogen-air interface.

[0078] It should be noted that although the steps of the method of the present application are described in a specific order in the drawings, this does not require or imply that the steps must be performed in this specific order, or that all steps must be performed to achieve the desired results. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into one step, and / or one step may be decomposed into multiple steps.

[0079] The present application also provides a humidity control device for a hydrogen fuel cell power generation system. Figure 3 , the humidity control device 300 of the hydrogen fuel cell power generation system includes:

[0080] The current density setting module 302 is used to set the operating current density of the hydrogen fuel cell power generation system in real time according to the power demand of the hydrogen fuel cell power generation system after starting the startup program, and set the current density corresponding to the idle power as the first current density;

[0081] The current density determination module 304 is used to detect whether the operating current density of the hydrogen fuel cell power generation system is greater than a preset high current density; the preset high current density is greater than the first current density;

[0082] A first inlet pressure setting module 306 is configured to set the air inlet pressure to be greater than the hydrogen inlet pressure if the operating current density is less than or equal to a preset high current density;

[0083] A second inlet pressure setting module 308 is configured to set the hydrogen inlet pressure to be greater than the air inlet pressure if the operating current density is greater than a preset high current density;

[0084] The shutdown setting module 310 is used to reduce the operating current density to a first current density before starting the shutdown procedure, set the hydrogen inlet pressure to be greater than the air inlet pressure, and start the shutdown procedure after continuous operation for a period greater than or equal to a preset time period.

[0085] Optionally, the humidity control device 300 of the hydrogen fuel cell power generation system further includes:

[0086] The maximum cross pressure setting module after startup is used to set the maximum cross pressure of air and hydrogen according to the range of the operating current density if the operating current density is less than or equal to the preset high current density; the maximum cross pressure decreases as the range increases; if the operating current density is greater than the preset high current density, the maximum cross pressure is set to the first pressure;

[0087] The maximum cross pressure setting module before shutdown is used to set the maximum cross pressure to a second pressure before starting the shutdown procedure; the second pressure is greater than the first pressure.

[0088] Optionally, the maximum cross pressure setting module after startup is specifically used to, after setting the operating current density of the hydrogen fuel cell power generation system, if the operating current density is less than or equal to the first current density, set the maximum cross pressure of air and hydrogen to a third pressure; the third pressure is greater than the second pressure; if the operating current density is greater than the first current density and less than or equal to the second current density, set the maximum cross pressure of air and hydrogen to the second pressure; if the operating current density is greater than the second current density and less than or equal to the preset high current density, set the maximum cross pressure of air and hydrogen to the first pressure.

[0089] Optionally, the humidity control device 300 of the hydrogen fuel cell power generation system further includes:

[0090] a voltage deviation calculation module, configured to calculate the voltage deviation of the stack based on the voltage value of the stack cell if the operating current density is greater than the first current density and less than or equal to a preset high current density;

[0091] The maximum cross pressure increasing module is used to increase the maximum cross pressure when the voltage deviation is greater than the preset deviation.

[0092] Optionally, the maximum cross pressure increasing module is specifically used to increase the maximum cross pressure of air and hydrogen if the operating current density is greater than the first current density and less than or equal to the second current density, when the voltage deviation is greater than the first preset deviation; if the operating current density is greater than the second current density and less than or equal to the preset high current density, when the voltage deviation is greater than the second preset deviation, increase the maximum cross pressure of air and hydrogen, and the second preset deviation is greater than the first preset deviation.

[0093] The specific details of each module or unit in the above device have been described in detail in the corresponding method, so they will not be repeated here.

[0094] It should be noted that, although several modules or units of the device for action execution are mentioned in the above detailed description, this division is not mandatory. In fact, according to the embodiment of the application, the features and functions of two or more modules or units described above can be concretized in one module or unit. On the contrary, the features and functions of one module or unit described above can be further divided into multiple modules or units to be concretized.

[0095] An embodiment of the present application also provides an electronic device, comprising: a processor; and a memory for storing instructions executable by the processor; wherein the processor is configured to execute the humidity control method for the hydrogen fuel cell power generation system described above in this example embodiment.

[0096] An embodiment of the present application further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the humidity control method of the above-mentioned hydrogen fuel cell power generation system.

[0097] It should be noted that the computer-readable storage media described herein may include, for example, but not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or components, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to, an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory, read-only memory, erasable programmable read-only memory (EPROM or flash memory), optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. As used herein, a computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, device, or component. The program code contained on the computer-readable storage medium may be transmitted using any suitable medium, including but not limited to wireless, wired, optical cable, radio frequency, or any suitable combination thereof.

[0098] An embodiment of the present application also provides a computer program product. When the computer program product is run on a computer, it enables the computer to execute the humidity control method of the hydrogen fuel cell power generation system.

[0099] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0100] The foregoing description is intended only to provide specific embodiments of the present application, which will enable those skilled in the art to understand and implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments described herein, but is intended to be construed in the broadest manner consistent with the principles and novel features disclosed herein.

Claims

1. A humidity control method for a hydrogen fuel cell power generation system, characterized in that: include: After starting the startup program, setting the operating current density of the hydrogen fuel cell power generation system in real time according to the power demand of the hydrogen fuel cell power generation system, and setting the current density corresponding to the idle power as the first current density; detecting whether an operating current density of the hydrogen fuel cell power generation system is greater than a preset high current density; the preset high current density is greater than the first current density; If the operating current density is less than or equal to the preset high current density, the air inlet pressure is set to be greater than the hydrogen inlet pressure; according to the range of the operating current density, the maximum cross pressure of air and hydrogen is set; the maximum cross pressure decreases as the range increases; If the operating current density is greater than the preset high current density, setting the hydrogen inlet pressure to be greater than the air inlet pressure; and setting the maximum crossover pressure to the first pressure; Before starting the shutdown procedure, reducing the operating current density to the first current density, setting the hydrogen inlet pressure to be greater than the air inlet pressure, and setting the maximum crossover pressure to the second pressure; After the machine continues to run for a period of time greater than or equal to a preset time period, a shutdown procedure is started, and the second pressure is greater than the first pressure.

2. The method according to claim 1, characterized in that The step of setting the maximum cross pressure of air and hydrogen according to the range of the operating current density includes: If the operating current density is less than or equal to the first current density, setting the maximum cross pressure of air and hydrogen to a third pressure; the third pressure is greater than the second pressure; If the operating current density is greater than the first current density and less than or equal to the second current density, setting the maximum cross pressure of air and hydrogen to the second pressure; If the operating current density is greater than the second current density and less than or equal to the preset high current density, the maximum cross pressure of air and hydrogen is set to the first pressure.

3. The method according to claim 1, characterized in that After setting the maximum cross pressure of air and hydrogen according to the range of the operating current density, the method further includes: If the operating current density is greater than the first current density and less than or equal to a preset high current density, calculating the voltage deviation of the stack according to the voltage value of the single chip of the stack; When the voltage deviation is greater than a preset deviation, the maximum cross pressure is increased.

4. The method according to claim 3, characterized in that When the voltage deviation is greater than a preset deviation, increasing the maximum cross pressure includes: If the operating current density is greater than the first current density and less than or equal to the second current density, and if the voltage deviation is greater than a first preset deviation, increasing the maximum cross pressure of air and hydrogen; If the operating current density is greater than the second current density and less than or equal to the preset high current density, the maximum cross pressure of air and hydrogen is increased when the voltage deviation is greater than the second preset deviation, and the second preset deviation is greater than the first preset deviation.

5. A humidity control device for a hydrogen fuel cell power generation system, characterized in that: include: a current density setting module, configured to set the operating current density of the hydrogen fuel cell power generation system in real time according to the power demand of the hydrogen fuel cell power generation system after starting the startup program, and set the current density corresponding to the idle power as a first current density; a current density determination module, configured to detect whether the operating current density of the hydrogen fuel cell power generation system is greater than a preset high current density; the preset high current density is greater than the first current density; a first inlet pressure setting module, configured to set the air inlet pressure to be greater than the hydrogen inlet pressure if the operating current density is less than or equal to a preset high current density; and to set a maximum crossover pressure between air and hydrogen according to the range of the operating current density; wherein the maximum crossover pressure decreases as the range increases; a second inlet pressure setting module, configured to set the hydrogen inlet pressure to be greater than the air inlet pressure if the operating current density is greater than a preset high current density; and to set the maximum crossover pressure to the first pressure; a shutdown setting module, configured to, before initiating a shutdown procedure, reduce the operating current density to the first current density, set the hydrogen inlet pressure to be greater than the air inlet pressure, and set the maximum crossover pressure to a second pressure; After the machine continues to run for a period of time greater than or equal to a preset time period, a shutdown procedure is started, and the second pressure is greater than the first pressure.

6. The device according to claim 5, characterized in that The post-startup maximum cross pressure setting module is specifically used to, after setting the operating current density of the hydrogen fuel cell power generation system, if the operating current density is less than or equal to the first current density, set the maximum cross pressure of air and hydrogen to a third pressure; the third pressure is greater than the second pressure; if the operating current density is greater than the first current density and less than or equal to the second current density, set the maximum cross pressure of air and hydrogen to the second pressure; if the operating current density is greater than the second current density and less than or equal to the preset high current density, set the maximum cross pressure of air and hydrogen to the first pressure.

7. The device according to claim 5, characterized in that The device further comprises: a voltage deviation calculation module, configured to calculate the voltage deviation of the stack based on the voltage value of the stack cell if the operating current density is greater than the first current density and less than or equal to a preset high current density; The maximum cross pressure increasing module is configured to increase the maximum cross pressure when the voltage deviation is greater than a preset deviation.

8. The device according to claim 7, characterized in that The maximum cross pressure increasing module is specifically used to increase the maximum cross pressure of air and hydrogen if the operating current density is greater than the first current density and less than or equal to the second current density, and the voltage deviation is greater than a first preset deviation; if the operating current density is greater than the second current density and less than or equal to the preset high current density, the maximum cross pressure of air and hydrogen is increased if the voltage deviation is greater than a second preset deviation, and the second preset deviation is greater than the first preset deviation.

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