CN113122879B - Hydrogen production control method and hydrogen production system - Google Patents
Hydrogen production control method and hydrogen production system Download PDFInfo
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- CN113122879B CN113122879B CN202110411207.8A CN202110411207A CN113122879B CN 113122879 B CN113122879 B CN 113122879B CN 202110411207 A CN202110411207 A CN 202110411207A CN 113122879 B CN113122879 B CN 113122879B
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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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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/133—Renewable energy sources, e.g. sunlight
Abstract
The invention provides a hydrogen production control method and a hydrogen production system, which are applied to the technical field of hydrogen production. According to the method, before formal hydrogen production, the hydrogen production time period with the highest hydrogen production electric quantity ratio of the new energy is determined through prediction of the output power of the new energy power supply, and the hydrogen production equipment is controlled to operate in the hydrogen production time period, so that the phenomenon that the hydrogen production equipment is started too early or too late to consume a large amount of electric quantity of a power grid in the whole hydrogen production process is avoided, the hydrogen production electric quantity ratio of the new energy is improved, and the hydrogen production cost is reduced.
Description
Technical Field
The invention relates to the technical field of hydrogen production, in particular to a hydrogen production control method and a hydrogen production system.
Background
Hydrogen energy belongs to renewable, zero-pollution and zero-emission energy, and is one of the most widely accepted clean energy sources with application prospects. Among the numerous hydrogen production methods, the hydrogen production by water electrolysis is widely applied due to the advantages of environmental friendliness, high hydrogen purity, low carbon emission in the hydrogen production process and the like. Referring to fig. 1, fig. 1 is a block diagram of a grid-connected hydrogen production system in the prior art, in the hydrogen production system, a new energy power supply is connected with an alternating current side of an AC/DC converter through a DC/AC converter, a direct current side of the AC/DC converter is connected with hydrogen production equipment, namely a water electrolyzer, and further, an alternating current grid is also connected with the alternating current side of the AC/DC converter.
When the hydrogen production system shown in fig. 1 is in operation, if the output power of the new energy power supply is less than the minimum power required by hydrogen production, the energy controller can control the new energy power supply and the alternating current power grid to simultaneously output the hydrogen production power to the hydrogen production equipment so as to meet the hydrogen production requirement.
However, in the hydrogen production control method implemented based on the grid-connected hydrogen production system shown in fig. 1 in the prior art, the hydrogen production cost is higher as a whole due to neglecting the control of the hydrogen production electric quantity ratio of new energy, namely the ratio of the hydrogen production electric quantity provided by the new energy power supply to the required hydrogen production electric quantity, and the popularization and application of the grid-connected hydrogen production system are limited.
Disclosure of Invention
The invention provides a hydrogen production control method and a hydrogen production system, wherein a hydrogen production time period with the highest hydrogen production electric quantity ratio of new energy is determined in a preset working time period corresponding to a new energy power supply, and hydrogen production equipment is controlled to operate in the hydrogen production time period, so that the use proportion of electric energy provided by the new energy power supply is increased, and the hydrogen production cost is reduced.
In order to achieve the purpose, the technical scheme provided by the application is as follows:
in a first aspect, the present invention provides a hydrogen production control method comprising:
acquiring the output power predicted values of the required hydrogen production electric quantity and the new energy power supply within a preset working time period;
determining a hydrogen production time period with the highest hydrogen production electric quantity ratio of new energy in the preset working time period according to the required hydrogen production electric quantity and the predicted value of the output power;
and controlling the hydrogen production equipment to produce hydrogen in the hydrogen production time period.
Optionally, the determining, according to the hydrogen production electric quantity required and the predicted output power value, a hydrogen production time period in which the hydrogen production electric quantity of the new energy accounts for the highest ratio in the preset working time period includes:
determining the electric quantity which is provided by the new energy power supply within the preset working time period and can be used for hydrogen production to obtain the available hydrogen production electric quantity;
determining a target constraint condition of a preset calculation model according to the magnitude relation between the available hydrogen production electric quantity and the required hydrogen production electric quantity;
and solving the preset calculation model based on the target constraint condition, the required hydrogen production electric quantity and the output power predicted value to obtain a hydrogen production time period determined to enable the hydrogen production electric quantity of the new energy to occupy the highest ratio in the preset working time period.
Optionally, the preset calculation model includes:
wherein eta (t) represents the hydrogen and electricity production ratio of the new energy;
W 1 representing the required hydrogen production capacity;
W 2 representing the practical hydrogen production capacity;
t shutdown Represents the end time of the hydrogen production time period;
t starting up Represents the start time of the hydrogen production time period;
p (t) represents the hydrogen production power.
Optionally, determining a target constraint condition of a preset calculation model according to the magnitude relation between the available hydrogen production electric quantity and the required hydrogen production electric quantity includes:
if the available hydrogen production electric quantity is larger than or equal to the required hydrogen production electric quantity, the target constraint conditions of the preset calculation model are as follows:
wherein, t 1 Representing the starting time of the preset working time period;
t 6 representing the end time of the preset working time period;
n number of start and stop Representing the number of start-stop times of the hydrogen production equipment, and N is more than 1.
Optionally, the determining a target constraint condition of a preset calculation model according to the magnitude relationship between the available hydrogen production electric quantity and the required hydrogen production electric quantity further includes:
if the available hydrogen production electric quantity is smaller than the required hydrogen production electric quantity, the target constraint conditions of the preset calculation model are as follows:
wherein, W 3 Representing the available hydrogen production capacity.
Optionally, the determining the amount of electricity available for hydrogen production provided by the new energy power supply in the preset operating time period to obtain the amount of available hydrogen production electricity includes:
obtaining the highest hydrogen production power of the hydrogen production equipment;
calculating the total electric quantity output by the new energy power supply within the preset working time period according to the predicted output power value;
calculating the residual electric quantity of the new energy power supply which cannot be used for hydrogen production within the preset working time period according to the output power predicted value and the highest hydrogen production power;
and taking the difference value of the total electric quantity and the residual electric quantity as the available hydrogen production electric quantity.
Optionally, the calculating, according to the predicted value of the output power and the maximum hydrogen production power, the remaining electric quantity of the new energy power supply that cannot be used for hydrogen production in the preset operating time period includes:
taking a time period corresponding to the time period when the predicted value of the output power is greater than the highest hydrogen production power in the preset working time period as a target time period;
and calculating the electric quantity output by the new energy power supply in the target time period based on the predicted output power value to obtain the residual electric quantity which cannot be used for hydrogen production by the new energy power supply.
Optionally, the controlling the hydrogen production equipment to produce hydrogen in the hydrogen production time period includes:
acquiring an actual value of the output power of the new energy power supply and the lowest hydrogen production power and the highest hydrogen production power of the hydrogen production equipment;
and adjusting the hydrogen production power output to the hydrogen production equipment by the AC/DC converter in the hydrogen production system according to the magnitude relation between the actual value of the output power and the minimum hydrogen production power and the maximum hydrogen production power.
Optionally, the adjusting hydrogen production power output from the AC/DC converter to the hydrogen production equipment in the hydrogen production system according to the magnitude relationship between the actual value of the output power and the minimum hydrogen production power and the maximum hydrogen production power includes:
if the actual value of the output power is smaller than the minimum hydrogen production power, taking the minimum hydrogen production power as the hydrogen production power output to the hydrogen production equipment by an AC/DC converter in a hydrogen production system;
if the actual value of the output power is larger than or equal to the lowest hydrogen production power and smaller than or equal to the highest hydrogen production power, taking the actual value of the output power as the hydrogen production power output by the AC/DC converter to the hydrogen production equipment;
and if the actual value of the output power is larger than the highest hydrogen production power, the highest hydrogen production power is used as the hydrogen production power output by the AC/DC converter to the hydrogen production equipment.
Optionally, if the available hydrogen production electric quantity is smaller than the required hydrogen production electric quantity, after the new energy power supply is shut down, the AC/DC converter in the hydrogen production system is controlled to output preset hydrogen production power to the hydrogen production equipment until the target hydrogen production quantity is reached.
Optionally, the minimum hydrogen production power and the maximum hydrogen production power are respectively set based on a rated hydrogen production power of the hydrogen production equipment.
Optionally, the new energy power supply includes a photovoltaic system, and the obtaining of the predicted value of the output power of the new energy power supply in the preset working time period includes:
acquiring an output power prediction curve of the photovoltaic system in a preset working time period;
and recording an output power predicted value corresponding to any working moment of the photovoltaic system in the preset working time period by the output power predicted curve.
In a second aspect, the present invention provides a hydrogen production system comprising: a new energy power supply, a DC/AC converter, an AC/DC converter, hydrogen production equipment and an energy controller, wherein,
the output end of the new energy power supply is connected with the direct current side of the DC/AC converter;
the alternating current side of the DC/AC converter is connected with the alternating current side of the AC/DC converter;
the direct current side of the AC/DC converter is connected with the hydrogen production equipment;
the alternating current grid is connected with the alternating current side of the AC/DC converter;
the energy controller is connected to the DC/AC converter and the AC/DC converter, respectively, and is configured to perform the hydrogen production control method according to any one of the first aspect of the present invention.
Optionally, the new energy power source comprises a photovoltaic system.
According to the hydrogen production control method provided by the invention, after the hydrogen production electric quantity required and the output power predicted value of the new energy power supply in the preset working time period are obtained, the hydrogen production time period with the highest hydrogen production electric quantity ratio of the new energy power supply is determined in the preset working time period according to the hydrogen production electric quantity required and the output power predicted value of the new energy power supply in the preset working time period, and hydrogen production equipment is controlled to produce hydrogen in the obtained hydrogen production time period. According to the hydrogen production control method provided by the invention, before formal hydrogen production, the hydrogen production time period with the highest hydrogen production electric quantity ratio of the new energy is determined through prediction of the output power of the new energy power supply, and the hydrogen production equipment is controlled to operate in the hydrogen production time period, so that the phenomenon that the electric quantity of a power grid consumed in the whole hydrogen production process is too much due to the early or late start of the hydrogen production equipment is avoided, the hydrogen production electric quantity ratio of the new energy is favorably improved, the hydrogen production cost is further reduced, and the popularization and application of a grid-connected hydrogen production system are promoted.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a topology of an N-level inverter in the prior art;
fig. 2 is a flowchart of a hydrogen production control method according to an embodiment of the present invention;
FIG. 3 is a schematic diagram showing a correlation between a predicted output power and a hydrogen production time according to an embodiment of the present invention;
FIG. 4 is a flow diagram of another hydrogen production control method provided by an embodiment of the present invention;
FIG. 5 is a graphical representation of another predicted output power versus hydrogen production time in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The hydrogen production control method provided by the embodiment of the invention is applied to an energy controller in a grid-connected hydrogen production system, can also be applied to other controllers capable of controlling and managing hydrogen production power in the hydrogen production system, and can also be applied to a server on a network side under certain conditions. Referring to fig. 2, fig. 2 is a flowchart of a hydrogen production control method according to an embodiment of the present invention, where the flowchart of the method may include:
s100, obtaining the predicted value of the output power of the hydrogen production electric quantity and the new energy power supply in the preset working time period.
The new energy power source described in this embodiment and subsequent embodiments may be any new energy power source that can be applied to a grid-connected hydrogen production system in the prior art, and in a specific application, the new energy power source may be a photovoltaic power generation system, a wind power generation system, or the like, which is not specifically limited in this respect.
Correspondingly, because the new energy power supply often has certain limitation or requirement on the working time, taking a photovoltaic power generation system as an example, the new energy power supply can only generate electric energy in the time period with the sunlight, therefore, if the new energy power supply is realized based on the photovoltaic power generation system, the corresponding preset working time period can be set based on the time period with the sunlight in any day; correspondingly, if the wind power generation system adopted by the new energy power supply is adopted, the preset working time period corresponds to the time period of wind power which can enable the wind power generation system to normally generate electric energy. Based on the foregoing, in practical applications, the preset working time period needs to be combined with specific type selection of the new energy power supply, and environmental conditions are flexibly selected.
And the predicted value of the output power of the new energy power supply in the preset working time period can be obtained based on historical power generation data of the new energy power supply or prediction of a related prediction system. Moreover, the output power predicted value of the new energy power supply in the preset working time period can be embodied in various forms, for example, a power prediction curve form can be embodied, and the output power predicted value corresponding to each working moment in the preset working time period can be definitely obtained through the curve; for another example, the recording may be performed in the form of an array, and each group of data records the working time and the predicted output power value corresponding to the working time, and of course, the recording may also be performed in other manners, which are not listed here.
Optionally, in a case that the new energy power supply adopts a photovoltaic system, the step may directly obtain an output power prediction curve of the photovoltaic system provided by the optical power prediction device within a preset working time period, and of course, an output power prediction value corresponding to any working time of the photovoltaic system within the preset working time period is recorded in the obtained output power prediction curve.
Further, in practical application, the hydrogen production amount of the hydrogen production system is determined every day or within a certain specified time period, and correspondingly, the required hydrogen production electric quantity corresponding to the hydrogen production amount is also determined.
And S110, determining a hydrogen production time period with the highest hydrogen production electric quantity ratio of the new energy in a preset working time period according to the hydrogen production electric quantity required and the output power predicted value.
According to the actual operation experience of the grid-connected hydrogen production system, under the condition that the hydrogen production electric quantity is required to be certain, the electric quantity provided by the new energy power supply for hydrogen production is higher, namely the proportion of the hydrogen production electric quantity of the new energy is higher, the total hydrogen production cost is lower, on the contrary, the hydrogen production electric quantity proportion of the new energy is lower, the total hydrogen production cost is higher, and the step aims to determine the hydrogen production time period with the highest hydrogen production electric quantity proportion of the new energy in the preset working time period.
In practical application, most hydrogen production equipment in the hydrogen production system corresponds to a power range capable of working normally, namely, the power range comprises the lowest hydrogen production power and the highest hydrogen production power, and the lowest hydrogen production power and the highest hydrogen production power are always set based on the rated hydrogen production power of the hydrogen production equipment. Optionally, a first scaling factor and a second scaling factor may be set according to the basic operating parameters and the overload capacity of the hydrogen production equipment, where the first scaling factor is less than 1, and a product of the first scaling factor and the rated hydrogen production power may be used as the minimum hydrogen production power; the second proportionality coefficient is larger than 1, and the product of the second proportionality coefficient and the rated hydrogen production power is used as the highest hydrogen production power. Of course, the specific selection of the first scaling factor and the second scaling factor may be determined in conjunction with the performance parameters of the hydrogen plant specifically used in the system.
Further, for a new energy power supply, the output power of the new energy power supply is often greatly influenced by environmental factors, the output power is unstable, and sometimes the output power of the new energy power supply exceeds the maximum hydrogen production power.
Based on the above, it is first required to determine the available hydrogen production electric quantity provided by the new energy power supply within the preset working time period, so as to obtain the available hydrogen production electric quantity.
Optionally, after the highest hydrogen production power of the hydrogen production equipment is determined, the total electric quantity output by the new energy power supply within the preset working time period is calculated further according to the output power predicted value obtained in the previous step, and then the remaining electric quantity which cannot be used for hydrogen production by the new energy power supply within the preset working time period is calculated according to the output power predicted value and the highest hydrogen production power.
Specifically, referring to fig. 3, fig. 3 is a schematic diagram of a corresponding relationship between a predicted output power value and hydrogen production time in an embodiment of the present invention, and the schematic diagram shows that the photovoltaic system operates in a preset operation time period (t) 1 -t 6 ) And (4) the output power predicted value corresponding to any working moment. Wherein the abscissa t represents the working time and the ordinate P 1 Represents the predicted value of the output power of the new energy power supply, P max Represents the aforementioned maximum hydrogen production power, P min Represents the aforementioned minimum hydrogen production power, t 2 -t 5 The meaning of each working moment is expanded in the following and will not be detailed here.
In the example shown in fig. 3, the area enclosed by the curve in the preset operating time period is the total electric quantity output by the new energy power supply in the preset operating time period, and as for the specific calculation process, reference may be made to the prior art, and details are not described here.
Accordingly, the output power prediction is greater than P max The part of (a) is the residual capacity that cannot be used for hydrogen production, shown as aw. In the specific calculation, the time period corresponding to the predicted value of the output power being greater than the maximum hydrogen production power in the preset working time period, that is, t in fig. 3, may be used as the target time period 3 To t 4 And calculating the electric quantity output by the new energy power supply in the target time period based on the predicted value of the output power in the target time period to obtain the residual electric quantity which cannot be used for hydrogen production by the new energy power supply. Of course, the specific calculation process of the remaining power may also be implemented based on the prior art, and the present invention is not limited thereto.
It is conceivable that the specific form of the output power prediction value is different, and the specific calculation method adopted when calculating the total electric quantity and the remaining electric quantity is also different, and the actual application needs to be selected in combination with the actual situation.
And after the total electric quantity and the residual electric quantity are obtained, the difference value of the obtained total electric quantity and the residual electric quantity is the available hydrogen production electric quantity. It should be noted that the available hydrogen production capacity calculated here is only the capacity that can be used for hydrogen production provided by the new energy power source, but in practical application, the capacity actually used for hydrogen production is most likely to be smaller than the available hydrogen production capacity obtained here.
Further, target constraint conditions of the preset calculation model are determined according to the size relation between the available hydrogen production electric quantity and the required hydrogen production electric quantity.
Optionally, the preset calculation model provided in the embodiment of the present invention may be characterized by using the following formula:
wherein eta (t) represents the ratio of the new energy hydrogen production electric quantity;
W 1 indicating the demand of hydrogen production electricity;
W 2 the practical hydrogen production electric quantity is represented, namely the electric quantity which can be really used for hydrogen production in the available hydrogen production electric quantity output by the new energy power supply;
t shutdown Represents the end time of the hydrogen production period;
t starting up Represents the start time of the hydrogen production time period;
p (t) represents the hydrogen production power.
Based on the expression of the preset calculation model, it can be seen that the preset calculation model provided in this embodiment takes the hydrogen production power demand and the output power predicted value of the new energy power supply as inputs, so that the start-stop time of the hydrogen production time period in which the hydrogen production power of the new energy accounts for the highest ratio is taken as an output, and of course, the corresponding target constraint condition is taken as a convergence basis.
If the available hydrogen production electric quantity is larger than or equal to the required hydrogen production electric quantity, the available hydrogen production electric quantity theoretically meets the hydrogen production requirement, and the total operation time of the hydrogen production equipment for completing the hydrogen production is within the range of the preset working time period. Meanwhile, the hydrogen production equipment has the lowest operating power, and the hydrogen production time period is determined, namely the least power supplied by the alternating current power grid is required in the time interval that the output power of the new energy power supply is less than the lowest operating power of the hydrogen production system, so that the hydrogen production electric quantity of the new energy used for hydrogen production is ensured to be the highest.
By combining the above conditions, under the condition that the available hydrogen production electric quantity is greater than or equal to the required hydrogen production electric quantity, the target constraint conditions of the preset calculation model are as follows:
wherein, t 1 Representing the starting time of a preset working time period;
t 6 representing the end time of the preset working time period;
n number of start and stop Representing the number of start-stop times of the hydrogen production equipment, and N is more than 1.
Correspondingly, if the available hydrogen production electric quantity is less than the required hydrogen production electric quantity, the available hydrogen production electric quantity of the new energy power supply does not meet the hydrogen production requirement. If it is guaranteed
Maximum, i.e. order W 2 ＝W 3 Namely, 100% of the available hydrogen production electric quantity generated by the new energy power supply is used for hydrogen production.
By combining the above conditions, under the condition that the available hydrogen production electric quantity is less than the required hydrogen production electric quantity, the target constraint conditions of the preset calculation model are as follows:
wherein, W 3 Representing the available hydrogen production capacity. The meanings of the remaining parameters can be found in the foregoing, and are not repeated here.
In practical application, the amount of hydrogen production electricity is selected and calculated according to the relation between the available hydrogen production electricity and the required hydrogen production electricityAfter the target constraint condition is matched with the actual situation, the preset calculation model can be solved based on the target constraint condition, the required hydrogen production electric quantity and the output power predicted value, and the obtained result comprises t Starting up And t Shutdown And obtaining the hydrogen production time period. As for the solving process of the preset calculation model, an intelligent optimization algorithm in the prior art such as a genetic algorithm can be used, which is not limited in the present invention.
And S120, controlling hydrogen production equipment to produce hydrogen in the hydrogen production time period.
After the hydrogen production time period with the highest hydrogen production electric quantity ratio of the new energy is determined, hydrogen production equipment is controlled to produce hydrogen in the time period, the hydrogen production electric quantity ratio of the new energy is improved, and the hydrogen production cost is reduced.
In conclusion, the hydrogen production control method provided by the invention determines the hydrogen production time period with the highest hydrogen production electric quantity ratio of the new energy through the prediction of the output power of the new energy power supply before formal hydrogen production, and controls the hydrogen production equipment to operate in the hydrogen production time period, so that the phenomenon that the electric quantity of a power grid consumed in the whole hydrogen production process is too much due to the early or late start of the hydrogen production equipment is avoided, the hydrogen production electric quantity ratio of the new energy is improved, the hydrogen production cost is reduced, and the popularization and application of a grid-connected hydrogen production system are promoted.
As previously described, the minimum hydrogen production power exists in the hydrogen production equipment, and when the hydrogen production power output from the AC/DC converter to the hydrogen production equipment in the system is less than the minimum hydrogen production power, the hydrogen production equipment cannot normally work, see FIG. 3, at t 1 -t 2 In the time period, the hydrogen production equipment cannot normally work by only depending on the electric energy of the new energy power supply, and under the condition, the alternating current power grid is required to simultaneously supply power to the system, so that the hydrogen production power output to the hydrogen production equipment by the AC/DC converter is ensured to be larger than or equal to the minimum hydrogen production power. In this case, a problem is involved if at t 1 -t 2 In the time period, the AC/DC converter is controlled to output the hydrogen production power at Pmax, the hydrogen production process is greatly accelerated, however, as the total hydrogen production quantity is determined, if a large amount of energy of an alternating current power grid is used for producing hydrogen in the former period, the electric quantity of the new energy power supply for producing hydrogen is used in the later hydrogen production processThe hydrogen production cost is increased, namely the ratio of the hydrogen production electric quantity of new energy is reduced. To solve this problem, another hydrogen production control method is provided in an embodiment of the present invention, and referring to fig. 4, a flow chart of the hydrogen production control method provided in this embodiment includes:
s200, acquiring the predicted values of the required hydrogen production electric quantity and the output power of the new energy power supply in the preset working time period.
Optionally, S200 may refer to an implementation process of S100 in the embodiment shown in fig. 2, and is not repeated here.
And S210, determining a hydrogen production time period with the highest hydrogen production electric quantity ratio of the new energy in a preset working time period according to the required hydrogen production electric quantity and the output power predicted value.
Optionally, S210 may refer to an implementation process of S110 in the embodiment shown in fig. 2, and is not repeated here.
And S220, acquiring an actual value of the output power of the new energy power supply and the lowest hydrogen production power and the highest hydrogen production power of the hydrogen production equipment.
The meaning of the lowest hydrogen production power and the highest hydrogen production power of the hydrogen production equipment and the selection in the practical application can be referred to the content of the embodiment shown in fig. 2, and the description is not repeated here.
It is emphasized that in this step, the actual value of the output power of the new energy power source needs to be obtained, and in the process of determining the hydrogen production time period in the foregoing step, the predicted value of the output power of the new energy power source is used, and a specific embodiment thereof may be the case shown in the embodiment shown in fig. 3 or fig. 5. On the basis, the hydrogen production process needs to be controlled by combining the actual value of the output power of the new energy power supply when the hydrogen production equipment is actually operated.
And S230, adjusting the hydrogen production power output to the hydrogen production equipment by the AC/DC converter in the hydrogen production system according to the magnitude relation between the actual value of the output power and the minimum hydrogen production power and the maximum hydrogen production power.
In particular, at the beginning of the time when the preset working time is reached, i.e. t 1 When the new energy power supply is started, the new energy power supply is started until t is reached Starting up The hydrogen production system is started up at all times, of course, in most casesUnder the condition of t Starting up ＝t 1 。
If the actual value of the output power of the new energy power supply is smaller than the minimum hydrogen production power, the minimum hydrogen production power is used as the hydrogen production power output to the hydrogen production equipment by the AC/DC converter in the hydrogen production system, namely the hydrogen production power is used as P min Electric energy which cannot be provided by the new energy power supply is supplemented by an alternating current power grid;
if the actual value of the output power of the new energy power supply is greater than or equal to the lowest hydrogen production power and less than or equal to the highest hydrogen production power, the actual value of the output power is used as the hydrogen production power which is output to the hydrogen production equipment by the AC/DC converter, namely, all electric energy of the new energy power supply is used for producing hydrogen;
and if the actual value of the output power of the new energy power supply is larger than the highest hydrogen production power, the highest hydrogen production power is used as the hydrogen production power output by the AC/DC converter to the hydrogen production equipment, the output power of the new energy power supply is fully utilized under the condition of ensuring the normal operation of the hydrogen production equipment, and the electric energy of the new energy power supply larger than the highest hydrogen production power is directly sent to the alternating current power grid.
The control process is suitable for the condition that the available hydrogen production electric quantity is more than or equal to the required hydrogen production electric quantity, and is also suitable for the condition that the available hydrogen production electric quantity is less than the required hydrogen production electric quantity. Different from the above, t is t when the available hydrogen production electric quantity is larger than or equal to the required hydrogen production electric quantity Shutdown T6 is less than or equal to, hydrogen production can be completed before the new energy power supply is shut down, and the new energy power supply and the hydrogen production equipment are shut down at the latest.
Further, referring to fig. 5, for the case that the available hydrogen production electric quantity is less than the required hydrogen production electric quantity, since the available hydrogen production electric quantity that the new energy power supply can be used for producing hydrogen is less than the required hydrogen production electric quantity, the new energy power supply reaches t Shutdown (t Shutdown ＝t 6 ) That is, at the end time of the preset operating time period, the preset hydrogen production amount is still not reached, and therefore, after the new energy power supply is stopped, the AC/DC converter in the hydrogen production system still needs to be controlled to output the preset hydrogen production power to the hydrogen production equipment until the target hydrogen production amount is reached, at t shown in fig. 5 Complete the process The hydrogen plant is stopped at that time.
It is conceivable that5, at t Stopping the machine To t Complete the process In a time period of P max As the hydrogen production power, the hydrogen production time can be effectively shortened, but in practical application, P can also be selected min -P max Any hydrogen production power therebetween, and the present invention is not particularly limited thereto.
In summary, according to the hydrogen production control method provided by the embodiment of the invention, after the hydrogen production time period in which the hydrogen production electric quantity of the new energy accounts for the highest is determined, the hydrogen production power output by the AC/DC converter to the hydrogen production equipment is flexibly adjusted according to the magnitude relation between the measured value of the output power of the new energy power supply and the lowest hydrogen production power and the highest hydrogen production power in the hydrogen production time period, so that the hydrogen production can be performed by fully utilizing the electric energy output by the new energy power supply, the hydrogen production electric quantity of the new energy power supply is remarkably improved, the hydrogen production cost is reduced, and the popularization and application of a grid-connected hydrogen production system are facilitated.
Optionally, an embodiment of the present invention further provides a hydrogen production system, including: a new energy power supply, a DC/AC converter, an AC/DC converter, hydrogen production equipment and an energy controller, wherein,
the output end of the new energy power supply is connected with the direct current side of the DC/AC converter;
the alternating current side of the DC/AC converter is connected with the alternating current side of the AC/DC converter;
the direct current side of the AC/DC converter is connected with the hydrogen production equipment;
the alternating current grid is connected with the alternating current side of the AC/DC converter;
the energy controller is respectively connected with the DC/AC converter and the AC/DC converter and is used for executing the hydrogen production control method provided by any one of the above embodiments.
Optionally, the new energy power source comprises a photovoltaic system.
The embodiments of the invention are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments can be referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present teachings, or modify equivalent embodiments to equivalent variations, without departing from the scope of the present teachings, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are within the scope of the technical solution of the present invention, unless the technical essence of the present invention is not departed from the content of the technical solution of the present invention.
Claims (13)
1. A hydrogen production control method characterized by comprising:
acquiring output power predicted values of the required hydrogen production electric quantity and the new energy power supply within a preset working time period;
determining a hydrogen production time period with the highest hydrogen production electric quantity ratio of new energy in the preset working time period according to the required hydrogen production electric quantity and the predicted value of the output power;
controlling hydrogen production equipment to produce hydrogen in the hydrogen production time period;
wherein, according to the hydrogen production electric quantity required and the output power predicted value, determining the hydrogen production time period with the highest hydrogen production electric quantity ratio of the new energy in the preset working time period comprises the following steps:
determining the electric quantity which is provided by the new energy power supply within the preset working time period and can be used for hydrogen production to obtain the available hydrogen production electric quantity;
determining a target constraint condition of a preset calculation model according to the magnitude relation between the available hydrogen production electric quantity and the required hydrogen production electric quantity;
and solving the preset calculation model based on the target constraint condition, the required hydrogen production electric quantity and the output power predicted value to obtain a hydrogen production time period determined to enable the hydrogen production electric quantity of the new energy to occupy the highest ratio in the preset working time period.
2. The hydrogen production control method according to claim 1, wherein the preset calculation model includes:
wherein eta (t) represents the hydrogen and electricity production ratio of the new energy;
W 1 representing the required hydrogen production capacity;
W 2 representing practical hydrogen production electric quantity;
t stopping the machine Represents the end time of the hydrogen production time period;
t starting up Represents the start time of the hydrogen production time period;
p (t) represents the hydrogen production power.
3. The hydrogen production control method according to claim 2, wherein the determining a target constraint condition of a preset calculation model according to the magnitude relation between the available hydrogen production capacity and the required hydrogen production capacity comprises:
if the available hydrogen production electric quantity is larger than or equal to the required hydrogen production electric quantity, the target constraint conditions of the preset calculation model are as follows:
wherein, t 1 Representing the starting time of the preset working time period;
t 6 representing the end time of the preset working time period;
n number of start and stop Representing the number of start-stop times of the hydrogen production equipment, and N is more than 1.
4. The hydrogen production control method according to claim 3, wherein the determining a target constraint condition of a preset calculation model according to the magnitude relation between the available hydrogen production capacity and the required hydrogen production capacity further comprises:
if the available hydrogen production electric quantity is smaller than the required hydrogen production electric quantity, the target constraint conditions of the preset calculation model are as follows:
wherein, W 3 Representing the available hydrogen production capacity.
5. The hydrogen production control method according to claim 1, wherein the determining the amount of power available for hydrogen production provided by the new energy power source in the preset operation time period to obtain an available amount of hydrogen production power comprises:
obtaining the highest hydrogen production power of the hydrogen production equipment;
calculating the total electric quantity output by the new energy power supply within the preset working time period according to the predicted value of the output power;
calculating the residual electric quantity of the new energy power supply which cannot be used for hydrogen production in the preset working time period according to the predicted value of the output power and the highest hydrogen production power;
and taking the difference value of the total electric quantity and the residual electric quantity as the available hydrogen production electric quantity.
6. The hydrogen production control method according to claim 5, wherein the calculating the remaining electric quantity of the new energy power supply that cannot be used for producing hydrogen in the preset operation time period according to the predicted output power value and the maximum hydrogen production power comprises:
taking the time period corresponding to the condition that the output power predicted value is greater than the highest hydrogen production power in the preset working time period as a target time period;
and calculating the electric quantity output by the new energy power supply in the target time period based on the predicted output power value to obtain the residual electric quantity which cannot be used for hydrogen production by the new energy power supply.
7. The hydrogen production control method according to claim 1, wherein the controlling the hydrogen production facility to produce hydrogen during the hydrogen production time period comprises:
acquiring an actual value of the output power of the new energy power supply and the lowest hydrogen production power and the highest hydrogen production power of the hydrogen production equipment;
and adjusting the hydrogen production power output to the hydrogen production equipment by the AC/DC converter in the hydrogen production system according to the magnitude relation between the actual value of the output power and the minimum hydrogen production power and the maximum hydrogen production power.
8. The hydrogen production control method according to claim 7, wherein the adjusting of the hydrogen production power output from the AC/DC converter to the hydrogen production equipment in the hydrogen production system according to the magnitude relationship between the actual value of the output power and the minimum hydrogen production power and the maximum hydrogen production power comprises:
if the actual value of the output power is smaller than the minimum hydrogen production power, taking the minimum hydrogen production power as the hydrogen production power output to the hydrogen production equipment by an AC/DC converter in a hydrogen production system;
if the actual value of the output power is larger than or equal to the lowest hydrogen production power and smaller than or equal to the highest hydrogen production power, taking the actual value of the output power as the hydrogen production power output by the AC/DC converter to the hydrogen production equipment;
and if the actual value of the output power is larger than the highest hydrogen production power, taking the highest hydrogen production power as the hydrogen production power output by the AC/DC converter to the hydrogen production equipment.
9. The hydrogen production control method according to claim 4, wherein if the available hydrogen production capacity is smaller than the required hydrogen production capacity, after the new energy power supply is shut down, an AC/DC converter in the hydrogen production system is controlled to output a preset hydrogen production power to the hydrogen production equipment until a target hydrogen production capacity is reached.
10. The hydrogen production control method according to claim 7, wherein the minimum hydrogen production power and the maximum hydrogen production power are each set based on a rated hydrogen production power of the hydrogen production plant.
11. The hydrogen production control method according to any one of claims 1 to 10, wherein the new energy power source comprises a photovoltaic system, and obtaining the predicted value of the output power of the new energy power source in a preset working period comprises:
acquiring an output power prediction curve of the photovoltaic system in a preset working time period;
and recording an output power predicted value corresponding to any working moment of the photovoltaic system in the preset working time period by the output power predicted curve.
12. A hydrogen production system, comprising: a new energy power supply, a DC/AC converter, an AC/DC converter, hydrogen production equipment and an energy controller, wherein,
the output end of the new energy power supply is connected with the direct current side of the DC/AC converter;
the alternating current side of the DC/AC converter is connected with the alternating current side of the AC/DC converter;
the direct current side of the AC/DC converter is connected with the hydrogen production equipment;
the alternating current grid is connected with the alternating current side of the AC/DC converter;
the energy controller is connected with the DC/AC converter and the AC/DC converter respectively, and is used for executing the hydrogen production control method of any one of claims 1-11.
13. The hydrogen generation system of claim 12, wherein the new energy source comprises a photovoltaic system.
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