CN113862728B - Pressure control method, system, equipment and medium for PEM pure water electrolysis hydrogen production - Google Patents
Pressure control method, system, equipment and medium for PEM pure water electrolysis hydrogen production Download PDFInfo
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- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 84
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 84
- 239000001257 hydrogen Substances 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 238000005868 electrolysis reaction Methods 0.000 title claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- 230000033228 biological regulation Effects 0.000 claims abstract description 54
- 230000001105 regulatory effect Effects 0.000 claims abstract description 31
- 238000004364 calculation method Methods 0.000 claims abstract description 21
- 230000001276 controlling effect Effects 0.000 claims abstract description 8
- 230000008859 change Effects 0.000 claims description 28
- 230000015654 memory Effects 0.000 claims description 14
- 238000004590 computer program Methods 0.000 claims description 12
- 238000012937 correction Methods 0.000 claims description 12
- 238000005070 sampling Methods 0.000 claims description 8
- 238000005259 measurement Methods 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000004422 calculation algorithm Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B15/00—Operating or servicing cells
- C25B15/02—Process control or regulation
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/02—Hydrogen or oxygen
- C25B1/04—Hydrogen or oxygen by electrolysis of water
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B15/00—Operating or servicing cells
- C25B15/02—Process control or regulation
- C25B15/023—Measuring, analysing or testing during electrolytic production
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B11/00—Automatic controllers
- G05B11/01—Automatic controllers electric
- G05B11/36—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential
- G05B11/42—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential for obtaining a characteristic which is both proportional and time-dependent, e.g. P. I., P. I. D.
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
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- Chemical Kinetics & Catalysis (AREA)
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- Automation & Control Theory (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
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- General Physics & Mathematics (AREA)
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
Abstract
The invention discloses a pressure control method, a system, equipment and a medium for PEM pure water electrolysis hydrogen production; the method comprises the following steps: the method comprises the steps of regularly obtaining the pressure value of a hydrogen outlet of an electrolytic tank, and calculating the parameter value of the pressure influence parameter of each obtaining period; establishing a fuzzy rule base storing fuzzy rules, inputting pressure influence parameters into the fuzzy rule base, calculating PID regulation parameters of each acquisition period, taking the weight calculation result of the PID regulation parameters of at least two adjacent acquisition periods as the PID regulation parameters of an output period, and outputting the PID regulation parameters; and controlling the opening of a valve of a hydrogen outlet of the electrolytic tank according to the output PID regulating parameters. The invention utilizes fuzzy logic and optimizes PID regulating parameters in real time according to a certain fuzzy rule, and further carries out weight calculation on the PID regulating parameters obtained by fuzzy calculation, thereby overcoming the defect that the PID regulating parameters cannot be regulated in real time and the hydrogen outlet valve of the electrolytic tank is greatly changed by the traditional PID parameters.
Description
Technical Field
The invention relates to the technical field of hydrogen production by water electrolysis, in particular to a pressure control method, a system, equipment and a medium for hydrogen production by PEM pure water electrolysis.
Background
The PEM pure water electrolytic hydrogen production technology is a clean and environment-friendly electrolytic water hydrogen production technology, has the characteristics of high efficiency, high hydrogen purity, no pollution, low energy consumption and the like, and has wide development prospect in the field of renewable energy sources. In the hydrogen production process of the PEM pure water electrolysis hydrogen production, hydrogen and oxygen are continuously generated in the electrolytic tank, and the control of the pressure parameter stability of the electrolytic tank is particularly important, so that the pressure stability of the electrolytic tank is ensured, and the pressure of the electrolytic tank needs to be monitored and controlled in real time.
In order to achieve the technical effects, the prior art generally adopts a mode of controlling the back pressure of a mechanical back pressure valve, however, the method is difficult to change the pressure of an electrolytic cell in real time according to the requirement of a hydrogen production system, in addition, the mechanical back pressure valve is difficult to determine the back pressure value, multiple times of adjustment according to experience are needed, and the requirement of controlling the pressure of a PEM electrolytic cell in real time cannot be met.
Disclosure of Invention
The invention aims to provide a pressure control method, a system, equipment and a medium for preparing hydrogen by electrolysis of PEM pure water, which solve one or more technical problems in the prior art and at least provide a beneficial choice or creation condition.
In a first aspect, a pressure control method for producing hydrogen by pure water electrolysis of a PEM is provided, comprising:
the method comprises the steps of regularly obtaining the pressure value of a hydrogen outlet of an electrolytic tank, and calculating the parameter value of the pressure influence parameter of each obtaining period; the pressure influencing parameters comprise pressure deviation and pressure deviation change rate;
establishing a fuzzy rule base storing fuzzy rules, inputting pressure influence parameters into the fuzzy rule base, calculating PID regulation parameters of each acquisition period, taking the weight calculation result of the PID regulation parameters of at least two adjacent acquisition periods as the PID regulation parameters of an output period, and outputting the PID regulation parameters; the PID regulation parameters comprise a proportion regulation coefficient, an integral regulation coefficient and a differential regulation coefficient;
and controlling the opening of a valve of a hydrogen outlet of the electrolytic tank according to the output PID regulating parameters.
Further, the step of obtaining the pressure value of the hydrogen outlet of the electrolytic tank at fixed time comprises the following steps:
the method comprises the steps of regularly obtaining a pressure actual measurement value of a hydrogen outlet of an electrolytic cell, which is collected by a pressure transmitter;
judging whether the measured value of the pressure of the hydrogen outlet of the electrolytic cell exceeds a critical pressure threshold value;
if so, taking the measured pressure value of the hydrogen outlet of the electrolytic cell as the pressure value of the hydrogen outlet of the electrolytic cell;
if not, the critical pressure threshold value is used as the pressure value of the hydrogen outlet of the electrolytic cell.
Further, the calculation formula of the pressure influence parameter is as follows:
e(k)＝P(k)-P * ，
wherein e (k) represents the pressure deviation at time k, e (k-1) represents the pressure deviation at time k-1, P (k) represents the actual pressure value at time k, and P * Let ec (k) be the pressure set value, ec (k) be the pressure deviation change rate at time k, and t be the acquisition cycle.
Further, the inputting the pressure influencing parameter into the fuzzy rule base and calculating the PID regulating parameter of each acquisition period comprises the following steps:
determining the membership degree of the pressure deviation and the pressure deviation change rate;
inquiring a fuzzy rule base, and determining the membership degree of the PID regulation parameter according to the membership degrees of the pressure deviation and the pressure deviation change rate;
determining the membership value of the PID regulating parameter according to the value range and the membership degree of the PID regulating parameter, and multiplying the membership degree of the PID regulating parameter by the membership value to obtain the PID regulating parameter of the acquisition period;
and correcting the PID regulating parameter by using a preset correcting parameter.
Further, the formula for correcting the PID adjustment parameters by using the preset correction parameters is as follows:
wherein K is P 、K I And K D Respectively represent a corrected proportional adjustment coefficient, an integral adjustment coefficient and a differential adjustment coefficient, K' P 、K′ I And K' D Respectively representing a preset proportional adjustment correction coefficient, an integral adjustment correction coefficient and a differential adjustment correction coefficient, delta K P 、ΔK I And DeltaK D Respectively representing a proportional adjustment coefficient, an integral adjustment coefficient and a differential adjustment coefficient obtained by membership degree operation.
Further, the outputting the PID adjustment parameters with the weight calculation result of the PID adjustment parameters of at least two adjacent acquisition periods as the PID adjustment parameters of an output period includes:
in the output period, a first weight is given according to the membership degree of the PID regulation parameters of each acquisition period, and a second weight is given according to the sequence of the PID regulation parameters of each acquisition period;
and calculating the weighted value sum of the PID regulating parameters of each acquisition period in the output period, and outputting the weighted value sum as the PID regulating parameter of the corresponding output period.
Further, the actual pressure value of the hydrogen outlet of the timed sampling electrolytic cell comprises: and respectively collecting actual pressure values of the hydrogen outlets of the plurality of timing sampling electrolytic tanks.
In a second aspect, a pressure control system for producing hydrogen by pure water electrolysis of PEM is provided, comprising:
the first module is used for acquiring the pressure value of the hydrogen outlet of the electrolytic tank at fixed time and calculating the parameter value of the pressure influence parameter of each acquisition period; the pressure influencing parameters comprise pressure deviation and pressure deviation change rate;
the second module is used for establishing a fuzzy rule base storing fuzzy rules, inputting pressure influence parameters into the fuzzy rule base, calculating PID adjustment parameters of each acquisition period, taking the weight calculation result of the PID adjustment parameters of at least two adjacent acquisition periods as the PID adjustment parameters of an output period and outputting the PID adjustment parameters; the PID regulation parameters comprise a proportion regulation coefficient, an integral regulation coefficient and a differential regulation coefficient;
and the third module is used for controlling the valve opening of the hydrogen outlet of the electrolytic tank according to the output PID regulating parameter.
In a third aspect, there is provided a computer device comprising:
a memory storing a computer program;
a processor which when executing the computer program implements the pressure control method for PEM pure water electrolysis hydrogen production as described in the first aspect.
In a fourth aspect, a computer storage medium is provided, on which a computer program is stored, characterized in that the computer program, when executed by a processor, implements the pressure control method for producing hydrogen by pure water electrolysis of PEM according to the first aspect.
The invention has the beneficial effects that: the PID regulation parameters are controlled in real time based on the fuzzy control principle, the PID regulation parameters are optimized in real time by utilizing fuzzy logic according to a certain fuzzy rule, and further weight calculation is carried out on the PID regulation parameters obtained by fuzzy operation, so that the defect that the PID regulation parameters cannot be regulated in real time and the hydrogen outlet valve of the electrolytic tank is greatly changed in the conventional PID parameters is overcome.
Drawings
FIG. 1 is a flow chart illustrating a method of pressure control for pure water electrolysis hydrogen production of a PEM according to one embodiment.
FIG. 2 is a flow chart illustrating a method of periodically acquiring a pressure value at a hydrogen outlet of an electrolyzer, according to one embodiment.
FIG. 3 is a flow chart illustrating a method of calculating PID tuning parameters of an acquisition cycle based on fuzzy rules, according to an embodiment.
FIG. 4 is a flow chart illustrating a method of weighting PID tuning parameters according to an embodiment.
FIG. 5 is a block diagram illustrating a pressure control system for producing hydrogen by pure water electrolysis of a PEM, according to one embodiment.
FIG. 6 is an internal block diagram of a computer device, according to one embodiment
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more clear, the present invention will be further described with reference to the embodiments and the accompanying drawings.
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present disclosure as detailed in the accompanying claims.
According to a first aspect of the present invention, a pressure control method for producing hydrogen by pure water electrolysis of PEM is provided.
Referring to fig. 1, fig. 1 is a flow chart illustrating a pressure control method for pure water electrolysis hydrogen production of a PEM according to one embodiment. As shown in fig. 1, the method comprises the steps of:
and S101, acquiring the pressure value of the hydrogen outlet of the electrolytic tank at fixed time, and calculating the parameter value of the pressure influence parameter of each acquisition period.
The pressure influence parameters comprise pressure deviation and pressure deviation change rate which are respectively used as two input variables in fuzzy control operation, wherein the pressure deviation reflects the error of the actual pressure relative to the pressure set value of the PID controller, and the pressure deviation change rate reflects the change trend of the pressure deviation.
In this embodiment, the calculation formula of the pressure influence parameter is:
e(k)＝P(k)-P * ，
wherein e (k) represents the pressure deviation at time k, e (k-1) represents the pressure deviation at time k-1, P (k) represents the actual pressure value at time k, and P * Let ec (k) be the pressure set value, ec (k) be the pressure deviation change rate at time k, and t be the acquisition cycle.
S102, establishing a fuzzy rule base storing fuzzy rules, inputting pressure influence parameters into the fuzzy rule base, calculating PID adjustment parameters of each acquisition period, and taking weight calculation results of the PID adjustment parameters of at least two adjacent acquisition periods as the PID adjustment parameters of an output period to output.
The PID tuning parameters include a proportional tuning coefficient, an integral tuning coefficient, and a differential tuning coefficient. The system response is quickened by increasing the proportion adjustment coefficient, the output value of the system response is quicker, but the system response cannot be well stabilized at an ideal value, the bad result is that although the influence of disturbance can be effectively overcome, the surplus difference occurs, and the system is greatly overshoot due to the overlarge proportion coefficient, oscillation is generated, and the stability is deteriorated. The integral regulating coefficient is increased to eliminate residual error based on proportion, and the system with accumulated error after stabilization can be error trimmed to reduce steady state error. The differential regulating coefficient has an advance function, and for a control channel with capacity hysteresis, differential participation control is introduced, and under the condition that differential terms are properly set, the differential regulating coefficient has a remarkable effect on improving the dynamic performance index of a system, and can reduce the overshoot of the system, increase the stability and reduce the dynamic error.
In this embodiment, the PID adjustment parameters are controlled in real time based on the fuzzy control principle, and when in actual use, the actual use scenario is analyzed first, that is, how to perform real-time PID control according to the received pressure value of the hydrogen outlet of the electrolytic tank, so as to form a fuzzy rule about the pressure influence parameters and the PID adjustment parameters, thereby finding the corresponding fuzzy PID adjustment parameters according to the fuzzy pressure influence parameters. For example, when the pressure deviation and the pressure deviation change rate are both excessively large in the forward direction, the current air pressure error is large and unstable, the system stability is poor, and the control strategy of reducing the proportional adjustment coefficient and increasing the integral adjustment coefficient can be adopted to effectively stabilize the system and reduce the pressure error.
Since each output of the PID control algorithm is related to the past state, errors are accumulated during calculation, if the controlled object is controlled according to the PID adjustment parameters obtained in each acquisition period, the control quantity of the calculation output can be greatly changed to cause the great change of the controlled object, and the performance and the service life of the controlled object are seriously affected. Based on the above, the embodiment performs weight calculation on the PID adjustment parameters of at least two sampling periods, outputs the calculated weight, calculates a more suitable PID adjustment parameter based on the weight calculation values of the PID adjustment parameters of a plurality of continuous sampling periods, and reduces the variation amplitude of the controlled object and the response times of the controlled object to a certain extent.
And S103, controlling the valve opening of the hydrogen outlet of the electrolytic tank according to the output PID regulating parameter.
In this embodiment, the PID adjustment parameters are controlled in real time based on the fuzzy control principle, that is, the PID adjustment parameters are optimized in real time by using fuzzy logic according to a certain fuzzy rule, and further weight calculation is performed on the PID adjustment parameters obtained by fuzzy calculation, so as to overcome the defect that the conventional PID parameters cannot be adjusted in real time and the controlled object varies greatly.
Referring to fig. 2, fig. 2 is a flow chart illustrating a method for periodically acquiring a pressure value at a hydrogen outlet of an electrolytic cell according to an embodiment. As shown in fig. 2, the method comprises the steps of:
and S201, acquiring a pressure actual measurement value of a hydrogen outlet of the electrolytic tank acquired by the pressure transmitter at fixed time.
And S202, judging whether the measured pressure value of the hydrogen outlet of the electrolytic tank exceeds a critical pressure threshold value. If yes, go to step S203; if not, step S204.
And S203, taking the measured pressure value of the hydrogen outlet of the electrolytic cell as the pressure value of the hydrogen outlet of the electrolytic cell.
And S204, taking the critical pressure threshold value as the pressure value of the hydrogen outlet of the electrolytic cell.
The method provided by the embodiment is used for determining the value of the pressure value of the hydrogen outlet of the electrolytic tank, and under the conventional condition, the pressure value of the hydrogen outlet of the electrolytic tank is considered to be in a pressure value interval, so that the membership value of the pressure deviation and the pressure deviation change rate in the fuzzy control operation process is also convenient to confirm. When the measured pressure value of the hydrogen outlet of the electrolytic cell collected by the pressure transmitter exceeds a critical pressure threshold value, judging that the measured pressure value is within a pressure value interval, otherwise, judging that the measured pressure value is not within the pressure value interval, and treating by taking the critical pressure threshold value as the pressure value of the hydrogen outlet of the electrolytic cell.
Referring to fig. 3, fig. 3 is a flowchart illustrating a method of calculating PID tuning parameters of an acquisition period according to a fuzzy rule, according to an embodiment. As shown in fig. 3, the method comprises the steps of:
and S301, determining the membership degree of the pressure deviation and the pressure deviation change rate.
Membership is a concept introduced to describe fuzzy relationships. When the pressure deviation and the pressure deviation change rate are subjected to blurring, the value intervals of the pressure deviation and the pressure deviation change rate are respectively divided into a plurality of intervals in a linear mode, the divided intervals are membership degrees, the values of the pressure deviation and the pressure deviation change rate are membership values, membership degrees of PID adjustment parameters can be determined according to membership degrees of the pressure deviation and the pressure deviation change rate according to the set relation between the pressure deviation and the pressure deviation change rate and the PID adjustment parameters, and therefore a blurring rule base is generated.
Illustratively, the value intervals of the pressure deviation and the pressure deviation change rate are divided into seven linear intervals, respectively, NB (negative large), NM (negative medium), NS (negative small), ZO (zero), PS (positive small), PM (medium), and PB (positive large), respectively, and the membership degree of the PID adjustment parameters also corresponds to the above-described division rule, and the fuzzy rule base of table 1 below is generated.
TABLE 1
S302, inquiring a fuzzy rule base, and determining the membership degree of the PID regulation parameter according to the membership degree of the pressure deviation and the pressure deviation change rate.
And S303, determining the membership value of the PID regulation parameter according to the value range and the membership degree of the PID regulation parameter, and multiplying the membership degree of the PID regulation parameter by the membership value to obtain the PID regulation parameter of the acquisition period.
And S304, correcting the PID regulating parameters by using preset correcting parameters.
In this embodiment, the formula for correcting the PID adjustment parameters using the preset correction parameters is:
wherein K is P 、K I And K D Respectively represent a corrected proportional adjustment coefficient, an integral adjustment coefficient and a differential adjustment coefficient, K' P 、K′ I And K' D Respectively representing a preset proportional adjustment correction coefficient, an integral adjustment correction coefficient and a differential adjustment correction coefficient, delta K P 、ΔK I And DeltaK D Respectively representing a proportional adjustment coefficient, an integral adjustment coefficient and a differential adjustment coefficient obtained by membership degree operation.
Referring to fig. 4, fig. 4 is a flowchart illustrating a method for weighting PID tuning parameters according to an embodiment. As shown in fig. 4, the method comprises the steps of:
s401, in the output period, a first weight is given according to the membership degree of the PID regulation parameters of each acquisition period, and a second weight is given according to the sequence of the PID regulation parameters of each acquisition period.
The first weight is used for measuring the weight of the membership degree of the PID regulation parameter, and the second weight is used for measuring the weight of the generation sequence of the PID regulation parameter.
The first weight and the second weight may be set according to actual control requirements, for example, when the PID adjustment parameter is PB, the pressure error and the pressure error change rate indicating the acquisition period are large, the first weight corresponding to PB is set to be the largest, for example, the PID adjustment parameter corresponding to the last acquisition period in the output period is closest to the PID adjustment parameter currently required to be output, and the second weight corresponding to the PID adjustment parameter of the last acquisition period is set to be the largest.
And S402, calculating the sum of weighted values of PID regulating parameters of each acquisition period in the output period, and outputting the sum as the PID regulating parameter of the corresponding output period.
In the present embodiment, five adjacent acquisition periods are taken as one output period. In one output period, the sum of the first weights is equal to 1, and the sum of the second weights is equal to 1.
In some embodiments, the timing sampling the actual pressure value at the hydrogen outlet of the electrolyzer comprises: and respectively collecting actual pressure values of the hydrogen outlets of the plurality of timing sampling electrolytic tanks. The pressure transmitters are sequentially arranged at the hydrogen outlets of the plurality of electrolytic tanks, the actual pressure values acquired by the pressure transmitters are subjected to fuzzy processing and operation respectively by adopting the pressure control method, and the PID regulating parameters are optimized in real time so as to control the valve opening of the hydrogen outlets simultaneously.
According to a second aspect of the present invention, a pressure control system for producing hydrogen by pure water electrolysis of PEM is provided.
Referring to fig. 5, fig. 5 is a block diagram illustrating a pressure control system for pure water electrolysis hydrogen production from a PEM according to one embodiment. As shown in fig. 5, the system includes:
a first module 501, configured to obtain a pressure value of a hydrogen outlet of the electrolytic tank at regular time, and calculate parameter values of pressure influence parameters of each obtaining period; the pressure influencing parameters comprise pressure deviation and pressure deviation change rate;
the second module 502 is configured to establish a fuzzy rule base storing fuzzy rules, input pressure influencing parameters into the fuzzy rule base, calculate PID adjustment parameters of each acquisition period, and take a weight calculation result of the PID adjustment parameters of at least two adjacent acquisition periods as a PID adjustment parameter of an output period for output; the PID regulation parameters comprise a proportion regulation coefficient, an integral regulation coefficient and a differential regulation coefficient;
and a third module 503, configured to control the valve opening of the hydrogen outlet of the electrolyzer according to the output PID adjustment parameter.
The pressure control system for producing hydrogen by pure water electrolysis of PEM performs the pressure control method for producing hydrogen by pure water electrolysis of PEM according to the first aspect, and the specific limitation of the pressure control system for producing hydrogen by pure water electrolysis of PEM may be referred to the limitation of the pressure control method for producing hydrogen by pure water electrolysis of PEM hereinabove, and will not be repeated herein.
The various modules in the pressure control system for producing hydrogen by pure water electrolysis of the PEM can be fully or partially realized by software, hardware and combinations thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules. Illustratively, the first module 501 may be a PLC controller, the second module 502 may be a fuzzy controller, and the third module 503 may be a PID controller.
According to a third aspect of the present invention, a computer device is provided.
Referring to fig. 6, fig. 6 is an internal structural diagram of a computer device according to an embodiment. As shown in fig. 6, the computer device includes a processor, a memory, and a database connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The computer program when executed by the processor implements a pressure control method for PEM pure water electrolysis hydrogen production.
According to a fourth aspect of the present invention, there is also provided a computer storage medium having a computer program stored therein, the computer storage medium may be a magnetic random access memory, a read-only memory, a programmable read-only memory, an erasable programmable read-only memory, an electrically erasable programmable read-only memory, a flash memory, a magnetic surface memory, a compact disc read-only, or the like; but may be a variety of devices including one or any combination of the above-described memories, such as a mobile phone, computer, tablet device, personal digital assistant, or the like. The computer program when executed by the processor realizes the pressure control method for producing hydrogen by electrolysis of PEM pure water.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
In this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a list of elements is included, and may include other elements not expressly listed.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. A pressure control method for producing hydrogen by pure water electrolysis of PEM, comprising:
the method comprises the steps of regularly obtaining the pressure value of a hydrogen outlet of an electrolytic tank, and calculating the parameter value of the pressure influence parameter of each obtaining period; the pressure influencing parameters comprise pressure deviation and pressure deviation change rate;
establishing a fuzzy rule base storing fuzzy rules, inputting pressure influence parameters into the fuzzy rule base, calculating PID regulation parameters of each acquisition period, taking the weight calculation result of the PID regulation parameters of at least two adjacent acquisition periods as the PID regulation parameters of an output period, and outputting the PID regulation parameters; the PID regulation parameters comprise a proportion regulation coefficient, an integral regulation coefficient and a differential regulation coefficient;
controlling the opening of a valve of a hydrogen outlet of the electrolytic tank according to the output PID regulating parameters;
the step of taking the weight calculation result of the PID adjustment parameters of at least two adjacent acquisition periods as the PID adjustment parameter of an output period and outputting the PID adjustment parameter comprises the following steps:
in the output period, a first weight is given according to the membership degree of the PID regulation parameters of each acquisition period, and a second weight is given according to the sequence of the PID regulation parameters of each acquisition period;
calculating the weighted sum of the PID regulation parameters of each acquisition period in the output period, and outputting the weighted sum as the PID regulation parameter of the corresponding output period;
the time-based acquisition of the pressure value of the hydrogen outlet of the electrolytic tank comprises the following steps:
the method comprises the steps of regularly obtaining a pressure actual measurement value of a hydrogen outlet of an electrolytic cell, which is collected by a pressure transmitter;
judging whether the measured value of the pressure of the hydrogen outlet of the electrolytic cell exceeds a critical pressure threshold value;
if so, taking the measured pressure value of the hydrogen outlet of the electrolytic cell as the pressure value of the hydrogen outlet of the electrolytic cell;
if not, taking the critical pressure threshold value as the pressure value of the hydrogen outlet of the electrolytic cell;
the calculation formula of the pressure influence parameter is as follows:
wherein e (k) represents the pressure deviation at time k, e (k-1) represents the pressure deviation at time k-1, P (k) represents the actual pressure value at time k, and P * Let ec (k) be the pressure set value, ec (k) be the pressure deviation change rate at time k, and t be the acquisition period;
the step of inputting the pressure influence parameters into a fuzzy rule base and calculating PID regulation parameters of each acquisition period comprises the following steps:
determining the membership degree of the pressure deviation and the pressure deviation change rate;
inquiring a fuzzy rule base, and determining the membership degree of the PID regulation parameter according to the membership degrees of the pressure deviation and the pressure deviation change rate;
determining the membership value of the PID regulating parameter according to the value range and the membership degree of the PID regulating parameter, and multiplying the membership degree of the PID regulating parameter by the membership value to obtain the PID regulating parameter of the acquisition period;
and correcting the PID regulating parameter by using a preset correcting parameter.
2. The pressure control method for producing hydrogen by pure water electrolysis of PEM according to claim 1, wherein said formula for correcting the PID adjustment parameters using preset correction parameters is:
wherein K is P 、K I And K D Respectively represent a corrected proportional adjustment coefficient, an integral adjustment coefficient and a differential adjustment coefficient, K' P 、K I 'and K' D Respectively representing a preset proportional adjustment correction coefficient, an integral adjustment correction coefficient and a differential adjustment correction coefficient, delta K P 、ΔK I And DeltaK D Respectively representing a proportional adjustment coefficient, an integral adjustment coefficient and a differential adjustment coefficient obtained by membership degree operation.
3. The pressure control method for producing hydrogen by pure water electrolysis of PEM according to claim 1, wherein said periodically sampling the actual pressure value at the hydrogen outlet of the electrolyzer comprises: and respectively collecting actual pressure values of the hydrogen outlets of the plurality of timing sampling electrolytic tanks.
4. A pressure control system for producing hydrogen by pure water electrolysis of PEM, wherein the pressure control system comprises:
the first module is used for acquiring the pressure value of the hydrogen outlet of the electrolytic tank at fixed time and calculating the parameter value of the pressure influence parameter of each acquisition period; the pressure influencing parameters comprise pressure deviation and pressure deviation change rate;
the second module is used for establishing a fuzzy rule base storing fuzzy rules, inputting pressure influence parameters into the fuzzy rule base, calculating PID adjustment parameters of each acquisition period, taking the weight calculation result of the PID adjustment parameters of at least two adjacent acquisition periods as the PID adjustment parameters of an output period and outputting the PID adjustment parameters; the PID regulation parameters comprise a proportion regulation coefficient, an integral regulation coefficient and a differential regulation coefficient;
and the third module is used for controlling the valve opening of the hydrogen outlet of the electrolytic tank according to the output PID regulating parameter.
5. A computer device, comprising:
a memory storing a computer program;
a processor which when executing the computer program implements the pressure control method of PEM pure water electrolysis hydrogen production as claimed in any one of claims 1-3.
6. A computer storage medium having stored thereon a computer program, which when executed by a processor implements a pressure control method of PEM pure water electrolysis hydrogen production as claimed in any one of claims 1-3.
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