Automatic control method and device for hydrogen pressure of hydrogen fuel cell

Abstract

The invention discloses an automatic control method and device for hydrogen pressure of a hydrogen fuel cell. The method comprises the following steps: firstly, respectively constructing a combined differentiator, a noise filter and a first-order inertial filter; and combining the combined differentiator, the noise filter and the first-order inertial filter to generate the low-interference advanced observer. And finally, designing the low-interference advanced observer into an automatic control system for the hydrogen pressure of the hydrogen fuel cell, and controlling the hydrogen pressure of the hydrogen fuel cell. Experimental results show that the low-interference advanced observer designed by the invention can cope with the problem that the random noise interference amplitude in the hydrogen pressure process signal is relatively high. Therefore, the problem that the automatic control effect of the hydrogen pressure of the hydrogen fuel cell is not ideal due to the fact that an existing advanced observer can amplify random noise is solved.

Description

Technical Field

[0001] The present application relates to the technical field of industrial process control, and in particular to a method and device for automatically controlling the hydrogen pressure of a hydrogen fuel cell. Background Art

[0002] In the field of industrial process control, the use of advance observers can obtain advance information about the process, which is of great significance for improving process control performance. However, the advance observer has the problem of amplifying random noise interference. In some industrial environments, the random noise interference is high, such as the hydrogen pressure control system of a hydrogen fuel cell. The amplitude of random noise interference in the hydrogen pressure process signal is relatively high, requiring the advance observer not to amplify random noise interference. However, the existing advance observer will amplify the random noise, resulting in unsatisfactory effect of automatic control of hydrogen pressure in hydrogen fuel cells. Summary of the invention

[0003] The present application provides a method and device for automatically controlling the hydrogen pressure of a hydrogen fuel cell, which is used to solve the problem that the existing advance observer amplifies random noise, resulting in unsatisfactory automatic control effect of the hydrogen pressure of the hydrogen fuel cell.

[0004] In view of this, the first aspect of the present application provides a method for automatically controlling hydrogen pressure of a hydrogen fuel cell, the method comprising:

[0005] Construct a combined differentiator, a noise filter, and a first-order inertial filter respectively;

[0006] Combining the combined differentiator, the noise filter and the first-order inertia filter to generate a low-interference lead observer;

[0007] The low-interference advance observer is designed into a hydrogen fuel cell hydrogen pressure automatic control system to control the hydrogen pressure of the hydrogen fuel cell.

[0008] Optionally, the expression of the combined differentiator is:

[0009] ;

[0010] In the formula, is the Laplace transfer function of the combined differentiator; is the lead observation time constant.

[0011] Optionally, the noise filter is expressed as:

[0012] ;

[0013] In the formula, is the Laplace transfer function of the noise filter; is the lead observation time constant.

[0014] Optionally, the expression of the first-order inertia filter is:

[0015] ;

[0016] In the formula, is the Laplace transfer function of the first-order inertial filter; T LO is the lead observation time constant.

[0017] Optionally, the expression of the low-interference advance observer is:

[0018] ;

[0019] In the formula, is the Laplace transfer function of the low-disturbance look-ahead observer; is the Laplace transfer function of the combined differentiator; is the Laplace transfer function of the noise filter; is the Laplace transfer function of the first-order inertial filter.

[0020] A second aspect of the present application provides a hydrogen fuel cell hydrogen pressure automatic control device, the device comprising:

[0021] A construction unit, used for respectively constructing a combined differentiator, a noise filter and a first-order inertia filter;

[0022] A generating unit, configured to generate a low-interference lead observer by combining the combined differentiator, the noise filter and the first-order inertia filter;

[0023] The control unit is used to design the low-interference advance observer into the hydrogen pressure automatic control system of the hydrogen fuel cell to control the hydrogen pressure of the hydrogen fuel cell.

[0024] Optionally, the expression of the combined differentiator is:

[0025] ;

[0026] In the formula, is the Laplace transfer function of the combined differentiator; is the lead observation time constant.

[0027] Optionally, the noise filter is expressed as:

[0028] ;

[0029] In the formula, is the Laplace transfer function of the noise filter; is the lead observation time constant.

[0030] Optionally, the expression of the first-order inertia filter is:

[0031] ;

[0032] In the formula, is the Laplace transfer function of the first-order inertial filter; T LO is the lead observation time constant.

[0033] Optionally, the expression of the low-interference advance observer is:

[0034] ;

[0035] In the formula, is the Laplace transfer function of the low-disturbance look-ahead observer; is the Laplace transfer function of the combined differentiator; is the Laplace transfer function of the noise filter; is the Laplace transfer function of the first-order inertial filter.

[0036] It can be seen from the above technical solutions that this application has the following advantages:

[0037] The present application provides a method for automatic control of hydrogen pressure of a hydrogen fuel cell, comprising: first, constructing a combined differentiator, a noise filter and a first-order inertial filter respectively; combining the combined differentiator, the noise filter and the first-order inertial filter to generate a low-interference advance observer. Finally, the low-interference advance observer is designed into the automatic control system of hydrogen pressure of the hydrogen fuel cell to control the hydrogen pressure of the hydrogen fuel cell. It can be seen from the experimental results that the low-interference advance observer designed in the present application can cope with the problem of relatively high amplitude of random noise interference in the hydrogen pressure process signal. This solves the problem that the existing advance observer will amplify the random noise, resulting in unsatisfactory effect of automatic control of hydrogen pressure of the hydrogen fuel cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic flow chart of a method for automatically controlling hydrogen pressure in a hydrogen fuel cell provided in an embodiment of the present application;

[0039] Figure 2 A schematic diagram of a low-interference advance observer provided in an embodiment of the present application designed for a hydrogen fuel cell hydrogen pressure automatic control system;

[0040] Figure 3 A schematic diagram of the frequency characteristics of a low-interference advance observer provided in an embodiment of the present application;

[0041] Figure 4A schematic diagram of the noise interference input provided in an embodiment of the present application;

[0042] Figure 5 A schematic diagram of the noise interference output provided in an embodiment of the present application;

[0043] Figure 6 This is a schematic diagram of the structure of a hydrogen fuel cell hydrogen pressure automatic control system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0044] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0045] See also Figure 1 , a hydrogen fuel cell hydrogen pressure automatic control method provided in an embodiment of the present application includes:

[0046] Step 101: construct a combined differentiator, a noise filter, and a first-order inertia filter respectively.

[0047] Step 102: Combine the combined differentiator, the noise filter and the first-order inertia filter to generate a low-interference lead observer.

[0048] Step 103: Design a low-interference advance observer into the hydrogen fuel cell hydrogen pressure automatic control system to control the hydrogen pressure of the hydrogen fuel cell.

[0049] In one embodiment, the expression of the combined differentiator in step 101 is:

[0050] ;

[0051] In the formula, is the Laplace transfer function of the combined differentiator; is the lead observation time constant, in seconds.

[0052] The expression of the noise filter is:

[0053] ;

[0054] In the formula, is the Laplace transfer function of the noise filter; is the lead observation time constant, in seconds.

[0055] The expression of the first-order inertial filter is:

[0056] ;

[0057] In the formula, is the Laplace transfer function of the first-order inertial filter; T LO is the lead observation time constant, in seconds.

[0058] In one embodiment, the expression of the low-interference look-ahead observer in 102 is:

[0059] ;

[0060] In the formula, is the Laplace transfer function of the low-disturbance look-ahead observer; is the Laplace transfer function of the combined differentiator; is the Laplace transfer function of the noise filter; is the Laplace transfer function of the first-order inertial filter.

[0061] In one embodiment, step 103 designs a low-interference advance observer into a hydrogen fuel cell hydrogen pressure automatic control system to control the hydrogen pressure of the hydrogen fuel cell, such as Figure 2 shown.

[0062] It should be noted that the advance observation time constant T of the low-interference advance observer is set LO =100s, and the frequency characteristics of the low-interference advance observer are obtained. Figure 3 shown.

[0063] Figure 3 In, P LDLO (ω) is the phase-frequency phase of the low-interference advance observer, in degrees (°); G LDLO (ω) is the amplitude-frequency gain of the low-interference lead observer, in dB.

[0064] according to Figure 3 , the lead phase peak of the low-interference lead observer is +56.9°, and the gain peak is 10.68dB.

[0065] It should be noted that, those skilled in the art know that a noise power gain less than 1 means that random noise interference is not amplified.

[0066] Among them, the noise power gain calculation formula is:

[0067] ;

[0068] Where NPG is the noise power gain, unit is dimensionless; n out(t) is the noise interference output, unit is dimensionless; n int (t) is the noise interference input, unit is dimensionless; T npg is the time for calculating the noise power gain, in seconds.

[0069] Specifically calculate the noise power gain NPG, the noise interference input n int (t) Select a pseudo-random signal and take T npg =2000s.

[0070] The digital calculation interval is 0.5s, and a pseudo-random signal with zero mean and a peak-to-peak value range of ±0.01 is input at the input end of the low-interference advance observer of the present application, representing the noise interference input n int (t), such as Figure 4 As shown; in this application, the noise interference output n is obtained at the output end of the low interference advance observer out (t) results, such as Figure 5 shown.

[0071] Specifically, the noise power gain NPG of the low-interference advance observer of the present application is obtained to be 0.208, that is, the low-interference advance observer provided by the present application does not amplify random noise interference. Therefore, the low-interference advance observer is designed into the hydrogen pressure automatic control system of the hydrogen fuel cell to control the hydrogen pressure of the hydrogen fuel cell, which can cope with the problem of relatively high random noise interference amplitude in the hydrogen pressure process signal.

[0072] The above is a hydrogen fuel cell hydrogen pressure automatic control method provided in an embodiment of the present application, and the following is a hydrogen fuel cell hydrogen pressure automatic control device provided in an embodiment of the present application.

[0073] See also Figure 6 , a hydrogen fuel cell hydrogen pressure automatic control device provided in an embodiment of the present application comprises:

[0074] The construction unit 201 is used to respectively construct a combined differentiator, a noise filter and a first-order inertia filter.

[0075] The generating unit 202 is used to generate a low-interference advance observer by combining a combined differentiator, a noise filter and a first-order inertia filter.

[0076] The control unit 203 is used to design a low-interference advance observer into the hydrogen pressure automatic control system of the hydrogen fuel cell to control the hydrogen pressure of the hydrogen fuel cell.

[0077] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described devices and units can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0078] The terms "first", "second", "third", "fourth", etc. (if any) in the specification of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0079] It should be understood that in this application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0080] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0081] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0082] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0083] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (full name in English: Read-Only Memory, English abbreviation: ROM), random access memory (full name in English: Random Access Memory, English abbreviation: RAM), disk or optical disk and other media that can store program codes.

[0084] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for automatically controlling hydrogen pressure in a hydrogen fuel cell, characterized in that: include: Construct a combined differentiator, a noise filter, and a first-order inertial filter respectively; Combining the combined differentiator, the noise filter and the first-order inertia filter to generate a low-interference lead observer; The low-interference advance observer is designed into a hydrogen fuel cell hydrogen pressure automatic control system to control the hydrogen pressure of the hydrogen fuel cell.

2. The hydrogen fuel cell hydrogen pressure automatic control method according to claim 1, characterized in that: The expression of the combined differentiator is: ； In the formula, is the Laplace transfer function of the combined differentiator; is the lead observation time constant.

3. The hydrogen fuel cell hydrogen pressure automatic control method according to claim 1, characterized in that: The expression of the noise filter is: ； In the formula, is the Laplace transfer function of the noise filter; is the lead observation time constant.

4. The hydrogen fuel cell hydrogen pressure automatic control method according to claim 1, characterized in that: The expression of the first-order inertial filter is: ； In the formula, is the Laplace transfer function of the first-order inertial filter; T LO is the lead observation time constant.

5. The hydrogen fuel cell hydrogen pressure automatic control method according to claim 1, characterized in that: The expression of the low-interference advance observer is: ； In the formula, is the Laplace transfer function of the low-disturbance look-ahead observer; is the Laplace transfer function of the combined differentiator; is the Laplace transfer function of the noise filter; is the Laplace transfer function of the first-order inertial filter.

6. A hydrogen fuel cell hydrogen pressure automatic control device, characterized in that: include: A construction unit, used for respectively constructing a combined differentiator, a noise filter and a first-order inertia filter; A generating unit, configured to generate a low-interference lead observer by combining the combined differentiator, the noise filter and the first-order inertia filter; The control unit is used to design the low-interference advance observer into the hydrogen pressure automatic control system of the hydrogen fuel cell to control the hydrogen pressure of the hydrogen fuel cell.

7. The hydrogen fuel cell hydrogen pressure automatic control device according to claim 6, characterized in that: The expression of the combined differentiator is: ； In the formula, is the Laplace transfer function of the combined differentiator; is the lead observation time constant.

8. The hydrogen fuel cell hydrogen pressure automatic control device according to claim 6, characterized in that: The expression of the noise filter is: ； In the formula, is the Laplace transfer function of the noise filter; is the lead observation time constant.

9. The hydrogen fuel cell hydrogen pressure automatic control device according to claim 6, characterized in that: The expression of the first-order inertial filter is: ； In the formula, is the Laplace transfer function of the first-order inertial filter; T LO is the lead observation time constant.

10. The hydrogen fuel cell hydrogen pressure automatic control device according to claim 6, characterized in that: The expression of the low-interference advance observer is: ； In the formula, is the Laplace transfer function of the low-disturbance look-ahead observer; is the Laplace transfer function of the combined differentiator; is the Laplace transfer function of the noise filter; is the Laplace transfer function of the first-order inertial filter.

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