CN113293396A - New energy hydrogen production system and control method thereof - Google Patents
New energy hydrogen production system and control method thereof Download PDFInfo
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- CN113293396A CN113293396A CN202110690698.4A CN202110690698A CN113293396A CN 113293396 A CN113293396 A CN 113293396A CN 202110690698 A CN202110690698 A CN 202110690698A CN 113293396 A CN113293396 A CN 113293396A
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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
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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
- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The invention provides a new energy hydrogen production system and a control method thereof, in the new energy hydrogen production system, the rated power of an electrolytic cell is smaller than the maximum power of a new energy power generation device, namely, the rated power of the electrolytic cell is reasonably reduced, and compared with the prior art, the initial investment cost of the system is reduced; after the power of the new energy power generation device is detected, if the power of the new energy power generation device is judged to be larger than or equal to the rated power of the electrolytic cell, the full-power operation of the electrolytic cell is controlled; then, providing operation electric energy for other electric equipment of the new energy hydrogen production system by using the residual power of the new energy power generation device; and then the maximization of the working efficiency of the electrolytic cell is realized, meanwhile, the reasonable distribution of the power of the new energy power generation device is realized, the additional electricity taking of other electric equipment in the system is avoided, the operation cost of the system is reduced, and the economic benefit of the system is improved.
Description
Technical Field
The invention relates to the technical field of new energy hydrogen production, in particular to a new energy hydrogen production system and a control method thereof.
Background
The photovoltaic power generation is used as green clean energy which is encouraged by the state, the installation scale is continuously increased in recent years, the competitiveness of photovoltaic hydrogen production is gradually enhanced along with the continuous reduction of the cost of the photovoltaic power generation, but the photovoltaic power generation has the problems of randomness, volatility, stage supply of running electric energy and the like, and certain waste is caused.
In the existing hydrogen production system, in order to bear the maximum output power of photovoltaic power generation, an electrolytic cell with corresponding rated power is matched according to the maximum power of the photovoltaic power generation; however, due to the randomness and the volatility of photovoltaic power generation, it is difficult to operate the electrolyzer at full load most of the time. The cost of the electrolytic cell accounts for a very large proportion in the whole hydrogen production system, so if the electrolytic cell cannot be fully utilized, the initial investment cost is large, the return on investment period is prolonged, the operation cost is increased, and the economic benefit of the system is reduced.
Disclosure of Invention
In view of the above, the invention provides a new energy hydrogen production system and a control method thereof, so as to reduce initial investment cost and operation cost.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
the invention provides a control method of a new energy hydrogen production system, wherein the new energy hydrogen production system comprises a new energy power generation device and an electrolytic cell, and the rated power of the electrolytic cell is less than the maximum power of the new energy power generation device; the control method comprises the following steps:
detecting the power of the new energy power generation device;
judging whether the power of the new energy power generation device is greater than or equal to the rated power of the electrolytic cell;
if the judgment result is yes, controlling the full-power operation of the electrolytic cell;
and providing operating electric energy for other electric equipment of the new energy hydrogen production system by using the residual power of the new energy power generation device.
Optionally, if the number of the other electric devices is greater than 1, providing operating electric energy for the other electric devices of the new energy hydrogen production system with the remaining power of the new energy power generation device, including:
and sequentially providing operating electric energy for the other electric equipment according to the priority of the other electric equipment by using the residual power.
Optionally, each of the other electric devices is: a water replenishing device and a heating device; in the control method, sequentially providing the operating electric energy for each of the other electric devices according to the priority of each of the other electric devices by using the remaining power, the method includes:
judging whether the residual power is greater than or equal to the rated power of the water replenishing device or not;
if the judgment result is yes, starting the water replenishing device and supplying power to the water replenishing device to replenish water for the water storage equipment of the new energy hydrogen production system until the liquid level in the water replenishing equipment reaches the upper limit of the liquid level;
judging whether the residual power is greater than or equal to the sum of the rated power of the water replenishing device and the rated power of the heating device;
and if so, starting the heating device and supplying power to the heating device to purify and regenerate the gas generated by the new energy hydrogen production system until the purification and regeneration are completed.
Optionally, each of the other electric devices is: a water replenishing device and an air compressor; in the control method, sequentially providing the operating electric energy for each of the other electric devices according to the priority of each of the other electric devices by using the remaining power, the method includes:
judging whether the residual power is greater than or equal to the rated power of the water replenishing device or not;
if the judgment result is yes, starting the water replenishing device and supplying power to the water replenishing device to replenish water for the water storage equipment of the new energy hydrogen production system until the liquid level in the water replenishing equipment reaches the upper limit of the liquid level;
judging whether the residual power is greater than or equal to the sum of the rated power of the water replenishing device and the rated power of the air compressor or not;
and if so, starting the air compressor and supplying power to the air compressor so as to supplement compressed air to compressed air storage equipment of the new energy hydrogen production system until the upper limit of the air pressure is reached.
Optionally, after determining whether the power of the new energy power generation device is greater than or equal to the rated power of the electrolytic cell, the method further includes:
if the judgment result is negative, controlling the electrolytic cell to operate by reducing power by a preset coefficient;
and then, providing operation electric energy for other electric equipment of the new energy hydrogen production system by using the residual power of the new energy power generation device.
Optionally, after determining whether the power of the new energy power generation device is greater than or equal to the rated power of the electrolytic cell, the method further includes:
and if the judgment result is negative, controlling the electrolytic cell to operate with the power of the new energy power generation device.
The invention provides a new energy hydrogen production system in a second aspect, which comprises: the system comprises a new energy power generation device, a power distribution device, an electrolytic cell, a controller and at least one other electric device; wherein:
the new energy power generation device is connected with the input end of the power distribution device;
the output end of the power supply distribution device is respectively connected with the electrolytic cell and each other electric equipment;
the rated power of the electrolytic cell is less than the maximum power of the new energy power generation device;
the power distribution device, the electrolytic cell and each of the other electric devices are controlled by the controller, so that the controller realizes the control method of the new energy hydrogen production system according to any one of the paragraphs of the first aspect of the invention.
Optionally, each of the other electric devices is: a water replenishing device, and a heating device or an air compressor;
in the process of distributing the residual power of the new energy power generation device, the priority of the water supplementing device is the highest;
the water replenishing device is used for replenishing water for water storage equipment of the new energy hydrogen production system, a liquid level meter is arranged in the water storage equipment, and the liquid level meter outputs a liquid level detection result to the controller;
the heating device is used for drying and regenerating the drying tower through heating, and purifying and regenerating the gas generated by the new energy hydrogen production system;
the air compressor is used for supplementing compressed air to compressed air storage equipment of the new energy hydrogen production system, an air pressure gauge is arranged in the compressed air storage equipment, and the air pressure gauge outputs an air pressure detection result to the controller.
Optionally, the new energy power generation device includes: at least one of a photovoltaic power generation device and a wind power generation device.
Optionally, the power distribution apparatus includes: at least two power conversion modules controlled by the controller;
the input end of each power conversion module receives corresponding power in the new energy power generation device;
the output end of one power conversion module is connected with the electrolytic bath;
and the output end of at least one power conversion module is connected with each other electric equipment.
Optionally, each of the other electric devices is connected to a corresponding one of the power conversion modules; alternatively, the first and second electrodes may be,
the other electric equipment shares the same power conversion module, and the power supply end of the other electric equipment is connected with the same power conversion module through the corresponding controllable switch; each controllable switch is controlled by the controller.
Optionally, when the new energy power generation device includes a photovoltaic power generation device, the power conversion module includes a plurality of DCDC converters having output ends connected in parallel, and an input end of each DCDC converter receives electric energy of a corresponding photovoltaic sub-array in the photovoltaic power generation device;
when the new energy power generation device comprises a wind power generation device, the power conversion module comprises a plurality of ACDC converters with output ends connected in parallel, and the input end of each ACDC converter receives the electric energy of a corresponding wind power generator in the wind power generation device.
According to the control method of the new energy hydrogen production system, in the new energy hydrogen production system, the rated power of the electrolytic cell is smaller than the maximum power of the new energy power generation device, namely the rated power of the electrolytic cell is reasonably reduced, and compared with the prior art, the initial investment cost of the system is reduced; after the power of the new energy power generation device is detected, if the power of the new energy power generation device is judged to be larger than or equal to the rated power of the electrolytic cell, the full-power operation of the electrolytic cell is controlled; then, providing operation electric energy for other electric equipment of the new energy hydrogen production system by using the residual power of the new energy power generation device; and then the maximization of the working efficiency of the electrolytic cell is realized, meanwhile, the reasonable distribution of the power of the new energy power generation device is realized, the additional electricity taking of other electric equipment in the system is avoided, the operation cost of the system is reduced, and the economic benefit of the system is improved.
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 embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flow chart of a control method of a new energy hydrogen production system provided by an embodiment of the invention;
fig. 2a and fig. 2b are schematic diagrams of two output power characteristic curves of a photovoltaic power generation device provided by an embodiment of the invention;
fig. 3, fig. 4, fig. 5 and fig. 6 are four flow charts of a control method of a new energy hydrogen production system according to an embodiment of the present invention;
fig. 7, fig. 8a, fig. 8b, fig. 9, fig. 10a and fig. 10b are schematic diagrams of six structures of a new energy hydrogen production system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention.
In this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
When the existing photovoltaic hydrogen production system is designed, a method of matching a corresponding electrolytic cell according to the maximum power of photovoltaic power generation is mostly adopted, so that the photovoltaic can be fully utilized, but the full-load operation of the electrolytic cell is difficult to realize most of the time due to the randomness and the volatility of the photovoltaic power generation, so that the problems of high initial investment cost, long investment return period, increased operation cost and the like are undoubtedly caused, and the economic benefit is low. Therefore, the invention provides a control method of a new energy hydrogen production system, so as to reduce the initial investment cost and the operation cost.
The new energy hydrogen production system comprises a new energy power generation device and an electrolytic cell, and the rated power of the electrolytic cell is smaller than the maximum power of the new energy power generation device; that is, compared with the situation that the rated power of the electrolytic cell is equal to the maximum power of the new energy power generation device in the prior art, the cost of the electrolytic cell is reduced, and the initial investment cost of the system is further reduced.
For the new energy hydrogen production system under the configuration of the electrolytic cell, the control method of the new energy hydrogen production system is shown in fig. 1 and comprises the following steps:
s101, detecting the power of the new energy power generation device.
In practical application, the new energy hydrogen production system is provided with corresponding detection equipment, so that the voltage and current information of the new energy power generation device can be detected, and the power of the new energy power generation device can be obtained.
In practical applications, the new energy power generation device may be at least one of a photovoltaic power generation device and a wind power generation device. The photovoltaic power generation device is taken as an example for explanation: assuming that the weather condition of a certain day can be sufficiently illuminated for a long time, the output power characteristic curve can be shown in fig. 2a, and the power Pm of the new energy power generation device is greater than the rated power Pe of the electrolytic cell during the photovoltaic stable output period. Assuming that the weather condition of a certain day is insufficient illumination, the output power characteristic curve can be seen in fig. 2b, and the power Pm of the new energy power generation device is always smaller than the rated power Pe of the electrolytic cell.
S102, judging whether the power of the new energy power generation device is larger than or equal to the rated power of the electrolytic cell.
If the determination result is yes, for example, if the output power characteristic curve of the new energy power generation device is as shown in fig. 2a, step S103 is executed.
S103, controlling the full-power operation of the electrolytic cell.
Controlling the full-power operation of the electrolytic cell, namely operating at the rated power Pe of the electrolytic cell; at this time, there will be a surplus of power of the new energy power generation device, that is, there is a surplus of power of the new energy power generation device, and the value of the surplus of power is specifically: the difference delta P between the power Pm of the new energy power generation device and the rated power Pe of the electrolytic cell is Pm-Pe.
And S104, providing operation electric energy for other electric equipment of the new energy hydrogen production system by using the residual power of the new energy power generation device.
In practical application, in the new energy hydrogen production system, besides the electrolytic bath, other electric devices such as a water replenishing device, a heating device, an air compressor and the like generally exist, and the other electric devices generally take electricity from an additional power supply, such as commercial power through respective DCDC converters. The water replenishing device is used for replenishing water to the water storage equipment of the new energy hydrogen production system; the heating device is used for drying and regenerating the drying tower by heating when the hydrogen is purified; the air compressor is used for supplementing compressed air to compressed air storage equipment of the new energy hydrogen production system.
In the embodiment, the rated power of the electrolytic cell is reduced, so that the electrolytic cell works at the rated power most of the time, and the new energy power generation device has residual power, so as to replace the extra power supply and provide running electric energy for other electric equipment; that is, the green energy provided by the new energy power generation device is used for maximizing the operation of the new energy hydrogen production system, so that the operation cost of the system is saved.
Therefore, the control method provided by the embodiment not only reasonably reduces the rated power of the electrolytic cell, but also reduces the initial investment cost of the system compared with the prior art; moreover, the maximization of the working efficiency of the electrolytic cell is realized, the reasonable distribution of the power of the new energy power generation device is realized, the additional electricity taking of other electric equipment in the system is avoided, the operation cost of the system is reduced, and the economic benefit of the system is improved.
On the basis of the previous embodiment, in the new energy hydrogen production system, if the number of the other electric devices is greater than 1, in step S104, the remaining power can be used to simultaneously supply power to at least two other electric devices, and the power consumption requirements of each electric device can also be sequentially met; the specific process of the latter can be seen in fig. 3:
and S400, sequentially providing operating electric energy for other electric equipment according to the priority of the other electric equipment by using the residual power.
In other electric devices receiving the surplus power supply, the priority levels set for the electric devices are different due to different functions, and two specific examples are provided as follows:
(1) suppose that the other electric devices powered by the remaining power are: a water replenishing device and a heating device, and at this time, the control method is as shown in fig. 4, wherein step S400 specifically includes:
s401, judging whether the residual power is larger than or equal to the rated power of the water replenishing device.
Assuming that the rated power of the water replenishing device is Pw, if Δ P is greater than or equal to Pw, that is, if the determination result is yes, step S402 is executed.
S402, starting the water replenishing device and supplying power to the water replenishing device to replenish water for the water storage equipment of the new energy hydrogen production system until the liquid level in the water replenishing equipment reaches the upper limit of the liquid level.
Referring to the new energy hydrogen production system shown in fig. 8a, when Δ P is greater than or equal to Pw, the water replenishing device 4 is started to operate to replenish water for the hydrogen production and water storage equipment 5, and when the liquid level meter 5-1 detects that the liquid level reaches the upper limit of the liquid level of the water storage equipment 5, the water replenishing is stopped.
And S403, judging whether the residual power is larger than or equal to the sum of the rated power of the water replenishing device and the rated power of the heating device.
Assuming that the rated power of the heating device is PH, if Δ P is greater than or equal to Pw + PH, i.e., if the determination result is yes, step S404 is executed.
And S404, starting the heating device and supplying power to the heating device to purify and regenerate the gas generated by the new energy hydrogen production system until the purification and regeneration are completed.
Referring to the new energy hydrogen production system shown in FIG. 8a, when Δ P is greater than or equal to Pw + PH, if the system is in purification operation, the heating device 6 is started to perform purification regeneration.
(2) Suppose that the other electric devices powered by the remaining power are: a water replenishing device and an air compressor; then, the control method is as shown in fig. 5, wherein step S400 specifically includes:
s411, judging whether the residual power is larger than or equal to the rated power of the water replenishing device.
If the rated power of the water replenishing device is Pw, if Δ P is greater than or equal to Pw, that is, if the determination result is yes, step S412 is executed.
And S412, starting the water replenishing device and supplying power to the water replenishing device to replenish water for the water storage equipment of the new energy hydrogen production system until the liquid level in the water replenishing equipment reaches the upper limit of the liquid level.
Referring to the new energy hydrogen production system shown in fig. 8b, when Δ P is greater than or equal to Pw, the water replenishing device 4 is started to operate to replenish water for the hydrogen production and water storage equipment 5, and when the liquid level meter 5-1 detects that the liquid level reaches the upper limit of the liquid level of the water storage equipment 5, the water replenishing is stopped.
And S413, judging whether the residual power is larger than or equal to the sum of the rated power of the water replenishing device and the rated power of the air compressor.
Assuming that the rated power of the air compressor is Pk, if Δ P is greater than or equal to Pw + Pk, i.e. if the determination result is yes, step S414 is executed.
And S414, starting the air compressor and supplying power to the air compressor, so that the air compressor supplements compressed air to compressed air storage equipment of the new energy hydrogen production system until the air pressure reaches the upper limit.
Referring to the new energy hydrogen production system shown in fig. 8b, when Δ P is greater than or equal to Pw + Pk, the air compressor 5 is started to supplement compressed air to the compressed air storage device 8; when the detection result of the barometer 8-1 shows that the air pressure in the compressed air storage device 8 reaches the upper limit of the air pressure, the supplementary compression control is stopped.
It should be noted that, in practical application, other electric devices in the new energy system are not limited to the above devices; for other electric equipment with different functions, the priority occupied by the electric equipment in the distribution process of the residual power is different; the above two cases are merely examples and are not limited thereto.
In addition to the above embodiments, the method for controlling a new energy hydrogen production system, after determining whether the power of the new energy power generation device is equal to or greater than the rated power of the electrolyzer in step S102, further includes the steps shown in fig. 6 (which is illustrated as an example based on fig. 1):
if the determination result is negative, that is, the output power characteristic curve of the new energy power generation device is the case shown in fig. 2b, step S105 is executed first, and then step S104 is executed.
And S105, controlling the electrolytic cell to operate at a reduced power by a preset coefficient.
During the stable photovoltaic output period, because Pm is less than Pe, the electrolytic cell 3 shown in fig. 8a or fig. 8b cannot operate at the full power of Pe, and at this time, the power of the electrolytic cell is reduced by a certain preset coefficient, and the preset coefficient is k, so that the operating power of the electrolytic cell Pe1 is k × Pe, and the hydrogen production system is maintained to operate continuously. At this time, the remaining power in step S104 is changed to Δ P1(Δ P1 ═ Pm-Pe 1), but the specific implementation process thereof can be referred to the above embodiment, and is not described in detail here.
In practical applications, if the determination result after step S102 is negative, that is, the output power characteristic curve of the new energy power generation device is the case shown in fig. 2b, an optional control manner is not excluded: and controlling the electrolytic cell to operate with the power of the new energy power generation device, and other electric equipment still obtains electricity from an additional power supply of the new energy power generation device. In this case, although the system operation cost cannot be saved, the initial investment cost of the system can be reduced.
Another embodiment of the present invention further provides a system for producing hydrogen from new energy, as shown in fig. 7, including: the system comprises a new energy power generation device 1, a power distribution device 2, an electrolytic cell 3, a controller 7 and at least one other electric device 10; wherein:
the new energy power generation device 1 is connected with the input end of the power distribution device 2 and provides a direct current power supply for the new energy hydrogen production system.
The output end of the power distribution device 2 is connected to the electrolytic bath 3 and each of the other electric devices 10.
The electrolytic cell 3 is a core device of the system, and the direct current electrolyzes water in the electrolytic cell 3 to generate hydrogen and oxygen; the rated power of the electrolytic cell 3 is smaller than the maximum power of the new energy power generation device 1.
The power distribution device 2, the electrolytic cell 3 and other electric devices 10 are controlled by the controller 7, so that the controller 7 can implement the control method of the new energy hydrogen production system according to any one of the embodiments, and can control the other electric devices 10 to operate according to different new energy generated power conditions and different control strategies under the condition of ensuring the operating efficiency of the electrolytic cell 3, and supply power to the other electric devices 10 by using the redundant electric energy of the new energy. The specific process and principle of the control method can be referred to the above embodiments, and are not described in detail herein. Under the control method, the hydrogen production energy control strategy is flexible, and the operation mode of the hydrogen production system can be flexibly switched according to different new energy power generation conditions, so that the hydrogen production system always works in the optimal state of fully utilizing the new energy power generation.
In practical applications, each of the other electric devices 10 may be: a water replenishing device 4, and a heating device 6 (as shown in fig. 8 a) or an air compressor 8 (as shown in fig. 8 b); wherein:
the water replenishing device 4 is used for replenishing water for a water storage device 5 of the new energy hydrogen production system, a liquid level meter 5-1 is arranged in the water storage device 5, and the liquid level meter 5-1 outputs a liquid level detection result to a controller 7.
The heating device 6 is used for drying and regenerating the drying tower by heating when the hydrogen purification operation is performed.
The air compressor 8 is used for supplementing compressed air to a compressed air storage device 9 of the new energy hydrogen production system, an air pressure gauge 8-1 is arranged in the compressed air storage device 8, and the air pressure gauge 8-1 outputs an air pressure detection result to the controller.
In the process of distributing the residual power of the new energy power generation device 1, the priority of the water supplementing device 4 is the highest; heating device 6 and air compressor 8 times. If the rated power configuration of the electrolytic cell 3 is further reduced by a part, other electric equipment with higher or lower priority can be additionally arranged, which is not limited at this time and depends on the application environment, and is within the protection scope of the application.
The new energy hydrogen production system discards the method of matching a high-power electrolytic tank according to the maximum power of photovoltaic power generation in the prior art and reasonably reduces the rated power of the electrolytic tank 3 aiming at the power generation characteristic of new energy; and the size of the electrolytic cell 3 is reasonably selected, so that the electrolytic cell can operate in a full-load state in most of time, and the utilization rate and the hydrogen production efficiency of the electrolytic cell 3 are greatly improved. Meanwhile, the balance distribution of the new energy power generation is realized through the allocation control of the controller 7, and the maximization of the working efficiency of the electrolytic cell 3 in the new energy hydrogen production system is realized. By the method, on one hand, the investment cost of the electrolytic cell 3 is reduced, so that the investment cost of a hydrogen production system is reduced, and the economic benefit of the system is improved; on the other hand, the energy consumption of a small hydrogen production system is relatively small, and meanwhile, the new energy power generation is fully utilized, so that compared with a large-power hydrogen production system, the energy consumption is better saved.
In practical application, the power distribution device 2 in the new energy hydrogen production system, as shown in fig. 9, includes: at least two power conversion modules 2-1 controlled by a controller 7; moreover, the input end of each power conversion module 2-1 receives the corresponding power in the new energy power generation device 1; the output end of one of the power conversion modules 2-1 is connected with the electrolytic bath; the output end of at least one other power conversion module 2-1 is connected with other electric equipment.
Specifically, each of the other electric devices 10 is connected to a corresponding power conversion module 2-1, as shown in fig. 10 a; or, each other electrical device 10 shares the same power conversion module 2-1, and the power supply terminals of each other electrical device 10 are connected to the same power conversion module 2-1 through the corresponding controllable switches K, respectively; each controllable switch K is controlled by the controller 7 as shown in fig. 10 b.
Optionally, the new energy power generation apparatus 1 includes: at least one of a photovoltaic power generation device (as shown in fig. 8a and 8 b) and a wind power generation device (not shown). Both have power fluctuation, so the new energy power generation device 1 can be only one of the two, or can be provided with both simultaneously, when both are provided, the power of the new energy power generation device 1 is the sum of the power of the two, and the rated power of the electrolytic cell 3 is less than the sum of the maximum power of the two; it is not limited herein, and is within the scope of the present application, depending on the specific application environment.
In practical application, when the new energy power generation device 1 comprises a photovoltaic power generation device, the power conversion module 2-1 comprises a plurality of DCDC converters with output ends connected in parallel, and the input end of each DCDC converter receives electric energy of a corresponding photovoltaic subarray in the photovoltaic power generation device respectively.
When the new energy power generation device 1 comprises a wind power generation device, the power conversion module 2-1 comprises a plurality of ACDC converters with output ends connected in parallel, and the input end of each ACDC converter receives the electric energy of a corresponding wind driven generator in the wind power generation device 1.
The same and similar parts among the various embodiments in the present specification are referred to each other, and each embodiment focuses on differences from other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the above description of the disclosed embodiments, the features described in the embodiments in this specification may be replaced or combined with each other to enable those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (12)
1. The control method of the new energy hydrogen production system is characterized in that the new energy hydrogen production system comprises a new energy power generation device and an electrolytic cell, and the rated power of the electrolytic cell is smaller than the maximum power of the new energy power generation device; the control method comprises the following steps:
detecting the power of the new energy power generation device;
judging whether the power of the new energy power generation device is greater than or equal to the rated power of the electrolytic cell;
if the judgment result is yes, controlling the full-power operation of the electrolytic cell;
and providing operating electric energy for other electric equipment of the new energy hydrogen production system by using the residual power of the new energy power generation device.
2. The method for controlling the new energy hydrogen production system according to claim 1, wherein if the number of the other electric devices is greater than 1, the method provides the operating electric energy for the other electric devices of the new energy hydrogen production system with the remaining power of the new energy power generation device, and comprises:
and sequentially providing operating electric energy for the other electric equipment according to the priority of the other electric equipment by using the residual power.
3. The control method of the new energy hydrogen production system according to claim 2, wherein each of the other electric devices is: a water replenishing device and a heating device; in the control method, sequentially providing the operating electric energy for each of the other electric devices according to the priority of each of the other electric devices by using the remaining power, the method includes:
judging whether the residual power is greater than or equal to the rated power of the water replenishing device or not;
if the judgment result is yes, starting the water replenishing device and supplying power to the water replenishing device to replenish water for the water storage equipment of the new energy hydrogen production system until the liquid level in the water replenishing equipment reaches the upper limit of the liquid level;
judging whether the residual power is greater than or equal to the sum of the rated power of the water replenishing device and the rated power of the heating device;
and if so, starting the heating device and supplying power to the heating device to purify and regenerate the gas generated by the new energy hydrogen production system until the purification and regeneration are completed.
4. The control method of the new energy hydrogen production system according to claim 2, wherein each of the other electric devices is: a water replenishing device and an air compressor; in the control method, sequentially providing the operating electric energy for each of the other electric devices according to the priority of each of the other electric devices by using the remaining power, the method includes:
judging whether the residual power is greater than or equal to the rated power of the water replenishing device or not;
if the judgment result is yes, starting the water replenishing device and supplying power to the water replenishing device to replenish water for the water storage equipment of the new energy hydrogen production system until the liquid level in the water replenishing equipment reaches the upper limit of the liquid level;
judging whether the residual power is greater than or equal to the sum of the rated power of the water replenishing device and the rated power of the air compressor or not;
and if so, starting the air compressor and supplying power to the air compressor so as to supplement compressed air to compressed air storage equipment of the new energy hydrogen production system until the upper limit of the air pressure is reached.
5. The method for controlling the new energy hydrogen production system according to any one of claims 1 to 4, further comprising, after determining whether the power of the new energy power generation device is equal to or greater than the rated power of the electrolytic cell:
if the judgment result is negative, controlling the electrolytic cell to operate by reducing power by a preset coefficient;
and then, providing operation electric energy for other electric equipment of the new energy hydrogen production system by using the residual power of the new energy power generation device.
6. The method for controlling the new energy hydrogen production system according to any one of claims 1 to 4, further comprising, after determining whether the power of the new energy power generation device is equal to or greater than the rated power of the electrolytic cell:
and if the judgment result is negative, controlling the electrolytic cell to operate with the power of the new energy power generation device.
7. A new energy hydrogen production system is characterized by comprising: the system comprises a new energy power generation device, a power distribution device, an electrolytic cell, a controller and at least one other electric device; wherein:
the new energy power generation device is connected with the input end of the power distribution device;
the output end of the power supply distribution device is respectively connected with the electrolytic cell and each other electric equipment;
the rated power of the electrolytic cell is less than the maximum power of the new energy power generation device;
the power distribution device, the electrolytic cell and each other electric device are controlled by the controller, so that the controller realizes the control method of the new energy hydrogen production system according to any one of claims 1 to 6.
8. The system for producing hydrogen from new energy according to claim 7, wherein each of the other electric devices is: a water replenishing device, and a heating device or an air compressor;
in the process of distributing the residual power of the new energy power generation device, the priority of the water supplementing device is the highest;
the water replenishing device is used for replenishing water for water storage equipment of the new energy hydrogen production system, a liquid level meter is arranged in the water storage equipment, and the liquid level meter outputs a liquid level detection result to the controller;
the heating device is used for drying and regenerating the drying tower through heating, and purifying and regenerating the gas generated by the new energy hydrogen production system;
the air compressor is used for supplementing compressed air to compressed air storage equipment of the new energy hydrogen production system, an air pressure gauge is arranged in the compressed air storage equipment, and the air pressure gauge outputs an air pressure detection result to the controller.
9. The system for producing hydrogen from new energy source of claim 7, wherein the new energy source power plant comprises: at least one of a photovoltaic power generation device and a wind power generation device.
10. The new energy hydrogen production system as claimed in any one of claims 7 to 9, wherein the power distribution means comprises: at least two power conversion modules controlled by the controller;
the input end of each power conversion module receives corresponding power in the new energy power generation device;
the output end of one power conversion module is connected with the electrolytic bath;
and the output end of at least one power conversion module is connected with each other electric equipment.
11. The system for producing hydrogen from new energy according to claim 10, wherein each of the other electrical devices is connected to a corresponding one of the power conversion modules; alternatively, the first and second electrodes may be,
the other electric equipment shares the same power conversion module, and the power supply end of the other electric equipment is connected with the same power conversion module through the corresponding controllable switch; each controllable switch is controlled by the controller.
12. The system for producing hydrogen from new energy resources of claim 10, wherein when the new energy power generation device comprises a photovoltaic power generation device, the power conversion module comprises a plurality of DCDC converters with output ends connected in parallel, and the input end of each DCDC converter receives the electric energy of a corresponding photovoltaic subarray in the photovoltaic power generation device;
when the new energy power generation device comprises a wind power generation device, the power conversion module comprises a plurality of ACDC converters with output ends connected in parallel, and the input end of each ACDC converter receives the electric energy of a corresponding wind power generator in the wind power generation device.
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