CN115094433A - Hybrid hydrogen production system for coupling electrochemical power supply and super capacitor and control method - Google Patents
Hybrid hydrogen production system for coupling electrochemical power supply and super capacitor and control method Download PDFInfo
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- 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
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- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
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- 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
- H02J1/106—Parallel operation of dc sources for load balancing, symmetrisation, or sharing
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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
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- H02J1/109—Scheduling or re-scheduling the operation of the DC sources in a particular order, e.g. connecting or disconnecting the sources in sequential, alternating or in subsets, to meet a given demand
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- 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
- H02J1/14—Balancing the load in a network
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- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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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
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- 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
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- 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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- 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
- H02J2300/40—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously
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Abstract
The invention relates to a hybrid hydrogen production system for coupling an electrochemical power supply and a super capacitor and a control method, wherein the hybrid hydrogen production system comprises an alkaline electrolysis hydrogen production subsystem, a shunt module, the super capacitor, the electrochemical power supply and a power generation subsystem; the power generation subsystem is connected with the shunt module; the super capacitor, the electrochemical power supply and the alkaline electrolytic hydrogen production subsystem are respectively connected to a shunt module; the shunt module inputs stable current into the alkaline electrolytic hydrogen production subsystem according to whether current fluctuation exceeding a preset threshold exists or not, the fluctuation current is input into the super capacitor, and the current higher than the current of the alkaline electrolytic hydrogen production subsystem is input into the super capacitor and the electrochemical power supply. Compared with the prior art, the invention has the advantages of ensuring the efficient and stable work of the electrolytic hydrogen production system, improving the energy utilization rate, prolonging the service life of the alkaline electrolytic cell and the electrochemical power supply and the like.
Description
Technical Field
The invention relates to the technical field of hydrogen production, in particular to a hybrid hydrogen production system for coupling an electrochemical power supply and a supercapacitor and a control method.
Background
The major categories of new energy sources are mainly solar energy, nuclear energy, hydrogen energy, wind energy and the like, wherein the hydrogen energy is used as a product without any secondary pollution, and the cleanest energy source is expected to become one of the main energy sources in the future. The hydrogen production by water electrolysis is one of the most common hydrogen production technologies at present, wherein the hydrogen production technology by alkaline water electrolysis is relatively mature and has already been commercialized. For the electric energy source of the alkaline water electrolysis hydrogen production system, the electric energy source mainly comprises a power grid, renewable energy sources and the like, and the renewable energy sources can realize the intrinsic low carbonization and the carbon-free generation of the whole industrial chain.
Renewable energy sources mainly include wind power, solar cells and the like, but these renewable energy sources are affected by climatic environments, have intermittency and instability, such as changes in wind direction and wind speed, changes in sunlight angle and intensity, and the like, and thus there are fluctuations in the current entering the electrolysis system. According to the change characteristics of the current, the typical current change is mainly divided into two categories, one category is that the current is stable and fluctuates in a large range, so that the generated current changes rapidly, and the hydrogen production capacity of the electrolytic cell is directly changed; one is that the current oscillates within a small range, resulting in instantaneous high frequency fluctuations in the operating conditions of the cell system, resulting in a decrease in cell stability and service life. There is no system currently available in the art that takes into account the above-mentioned characteristics of renewable energy sources to produce hydrogen.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a hybrid hydrogen production system of a coupling electrochemical power supply and a super capacitor and a control method thereof, wherein the hybrid hydrogen production system can ensure the efficient and stable operation of an electrolytic hydrogen production system, improve the energy utilization rate and prolong the service lives of an alkaline electrolytic cell and an electrochemical power supply.
The purpose of the invention can be realized by the following technical scheme:
as a first aspect of the present invention, a hybrid hydrogen production system coupling an electrochemical power source and a supercapacitor is provided, where the hybrid hydrogen production system includes an alkaline electrolysis hydrogen production subsystem, a shunting module, a supercapacitor, an electrochemical power source, and a power generation subsystem; the power generation subsystem is connected to the shunt module; the super capacitor, the electrochemical power supply and the alkaline electrolytic hydrogen production subsystem are respectively connected to a shunt module; the shunt module inputs stable current into the alkaline electrolytic hydrogen production subsystem according to whether current fluctuation exceeding a preset threshold exists or not, the fluctuation current is input into the super capacitor, and the current higher than the current of the alkaline electrolytic hydrogen production subsystem is input into the super capacitor and the electrochemical power supply.
As a preferable technical scheme, the alkaline electrolysis hydrogen production subsystem comprises an alkaline water electrolysis hydrogen production device and an alkaline membrane electrolysis hydrogen production device; the alkaline water electrolysis hydrogen production device and the alkaline membrane electrolysis hydrogen production device are respectively connected to the shunting module.
As a preferable technical scheme, the alkaline water electrolysis hydrogen production device comprises an alkaline water electrolysis tank, alkaline water circulation equipment and gas-liquid separation equipment; the alkali liquor circulating equipment and the gas-liquid separating equipment are respectively connected to an alkali liquor electrolytic cell; the alkaline water electrolytic cell is formed by assembling a positive electrode, a negative electrode, a diaphragm and an end plate.
As a preferred technical scheme, the alkaline membrane electrolysis hydrogen production device comprises an alkaline water electrolytic tank, alkaline water circulating equipment and gas-liquid separation equipment; the alkali liquor circulating equipment and the gas-liquid separating equipment are respectively connected to an alkali liquor electrolytic cell; the alkaline water electrolytic cell is formed by assembling a positive electrode, a negative electrode, an alkaline membrane and an end plate.
As a preferable technical scheme, the number of the alkaline water electrolysis tanks is single or multiple.
As a preferred technical solution, the super capacitor specifically comprises: a high power density energy storage device.
As a preferable technical solution, the super capacitor is an electric double layer super capacitor, a pseudo-capacitor super capacitor or a battery-capacitor hybrid super capacitor.
As a preferred technical scheme, the electrochemical power supply specifically comprises: high energy density energy storage devices that store energy through electrochemistry.
According to a preferable technical scheme, the electrochemical power supply is a lead-acid battery, a nickel-hydrogen battery, a lithium ion battery, a lithium battery, a sodium ion battery, a sodium battery, a dual-ion battery and a water system battery.
As a second aspect of the present invention, there is provided a control method for the above-described hybrid hydrogen production system, the control method comprising:
step 1: the power generation subsystem converts renewable energy into direct current and inputs the direct current into the shunt module;
and 2, step: the shunt module detects the output current value of the power generation subsystem;
if the output current of the power generation subsystem exceeds the rated current of the electrolytic cell, the current is shunted, 100% of the current required by the working condition is distributed to the alkaline electrolysis hydrogen production subsystem, and the residual current is input into the electrochemical power supply;
when the electrochemical power supply is charged, if the high-frequency current fluctuation exceeding a preset threshold value is detected in the current, the fluctuation current is input to the super capacitor in a shunting manner, and the stable current is input to the electrochemical power supply in a shunting manner;
if the output current of the power generation subsystem is lower than the rated current of the electrolytic bath but higher than the lowest working current of the electrolytic bath, the output current of the power generation subsystem is input into the alkaline electrolysis hydrogen production subsystem, and if the current has high-frequency current fluctuation exceeding a preset threshold value, the fluctuation current is input into the super capacitor, or the super capacitor is called to supply power to the alkaline electrolysis hydrogen production subsystem so as to compensate the current fluctuation and stably supply power to the alkaline electrolysis hydrogen production subsystem;
if the output current of the power generation subsystem is lower than the lowest working current of the electrolytic cell, the output current of the power generation subsystem is input into the alkaline electrolysis hydrogen production subsystem, meanwhile, the electrochemical power system is called to supply power to the electrolytic cell system, if the current signal has high-frequency current fluctuation exceeding a preset threshold value, the fluctuation current is input into the super capacitor or the super capacitor is called to compensate the current fluctuation, and the alkaline electrolysis system is stably supplied with power.
Compared with the prior art, the invention has the following beneficial effects:
firstly, ensuring the efficient and stable work of an electrolytic hydrogen production system: when the current of the power generation subsystem is lower than the minimum current of the electrolysis system, the electrochemical power supply and the super capacitor can serve as the power supply to serve as the electrolysis system, so that the efficient and stable operation of the electrolysis system is ensured; when the current is lower than the rated current of the electrolysis system in the current period, the electrochemical power supply can provide electric energy to ensure that the electrolysis system works under the rated working condition; meanwhile, the super capacitor is adopted to eliminate the characteristic of high-frequency fluctuation of power generation of renewable energy sources, so that the current input into the electrolytic bath and the electrochemical power supply is kept in a stable state.
Secondly, improving the energy utilization rate: when the current of the hybrid hydrogen production system and the control method thereof is higher than the rated current of the electrolysis system, the electrochemical power supply and the super capacitor can effectively store electric energy, and the utilization rate of the electric energy generated by the power generation of renewable energy sources is improved.
And thirdly, prolonging the service life of the alkaline electrolytic cell and the electrochemical power supply: the hybrid hydrogen production system and the control method thereof adopt the characteristic that the super capacitor system can eliminate the high-frequency fluctuation of the power generation of the renewable energy source, so that the current input into the electrolytic cell and the electrochemical power supply keeps a stable state, and the service lives of the alkaline electrolytic cell and the electrochemical power supply are obviously prolonged.
Drawings
FIG. 1 is a schematic diagram of the structure of a hybrid hydrogen production system in an embodiment of the present invention;
FIG. 2 is a schematic diagram of another configuration of a hybrid hydrogen production system in 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 some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.
Reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic may be included in at least one implementation of the present application. In the description of the present application, it is to be understood that the terms "upper", "lower", "left", "right", "top", "bottom", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referenced devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Moreover, the terms "first," "second," and the like are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.
Fig. 1 and 2 are schematic structural diagrams of a hybrid hydrogen production system for coupling an electrochemical power source and a supercapacitor provided in an embodiment of the present application, including: the system comprises an alkaline electrolytic hydrogen production subsystem 1, a shunt module 2, a super capacitor 3, a power generation subsystem 4 and an electrochemical power supply 5. The power generation subsystem 4 is connected to the shunt module 2, the super capacitor 3, the electrochemical power supply 5 and the alkaline electrolysis hydrogen production subsystem 1 are respectively connected to the shunt module 2, the shunt module 2 inputs stable current to the alkaline electrolysis hydrogen production subsystem 1 according to whether current fluctuation exceeding a preset threshold exists or not, and the fluctuation current is input to the super capacitor 3.
Specifically, the alkaline electrolysis hydrogen production subsystem 1 comprises an alkaline water electrolysis hydrogen production device and an alkaline membrane electrolysis hydrogen production device, and the alkaline water electrolysis hydrogen production device and the alkaline membrane electrolysis hydrogen production device are respectively connected to the shunting module.
Optionally, the alkaline water electrolysis hydrogen production device comprises an alkaline water electrolytic cell, an alkaline water circulation device and a gas-liquid separation device, wherein the alkaline water circulation device and the gas-liquid separation device are respectively connected to the alkaline water electrolytic cell, and the alkaline water electrolytic cell is formed by assembling a positive electrode, a negative electrode, a diaphragm and an end plate. Common hydrogen-generating capabilities include, but are not limited to, 200Nm3/h, 500Nm3/h, 800Nm3/h, 1000Nm3/h, 1500Nm3/h, 3000Nm3/h, and the like.
Optionally, the alkaline membrane electrolysis hydrogen production device comprises an alkaline water electrolytic cell, an alkaline water circulation device and a gas-liquid separation device, wherein the alkaline water circulation device and the gas-liquid separation device are respectively connected to the alkaline water electrolytic cell, and the alkaline water electrolytic cell is formed by assembling a positive electrode, a negative electrode, an alkaline membrane and an end plate. Common hydrogen production capacity includes, but is not limited to, 50Nm3/h, 100Nm3/h, 200Nm3/h, 500Nm3/h and the like.
Optionally, the number of alkaline water electrolysis cells is single or multiple.
Specifically, the super capacitor is specifically: the high-power density energy storage device can be selected from a double electric layer super capacitor, a pseudo capacitor super capacitor or a battery-capacitor hybrid super capacitor.
Specifically, the electrochemical power supply specifically comprises: the high energy density energy storage device through electrochemical energy storage can be selected from lead-acid batteries, nickel-hydrogen batteries, lithium ion batteries, lithium batteries, sodium ion batteries, sodium batteries, bi-ion batteries and water-based batteries.
The above is a description of system embodiments, and the following is a further description of the solution of the present invention by way of method embodiments.
A method of controlling a hybrid hydrogen production system using the above, comprising:
step 1: the power generation subsystem converts renewable energy into direct current and inputs the direct current into the shunt module;
step 2: the shunt module detects the output current value of the power generation subsystem;
if the output current of the power generation subsystem exceeds the rated current of the electrolytic cell, the current is shunted, 100% of the current required by the working condition is distributed to the alkaline electrolysis hydrogen production subsystem, and the residual current is input into the electrochemical power supply;
when the electrochemical power supply is charged, if the high-frequency current fluctuation exceeding a preset threshold value is detected in the current, the fluctuation current is input to the super capacitor in a shunting manner, and the stable current is input to the electrochemical power supply in a shunting manner;
if the output current of the power generation subsystem is lower than the rated current of the electrolytic cell but higher than the lowest working current of the electrolytic cell, the output current of the power generation subsystem is input into the alkaline electrolytic hydrogen production subsystem, and if the current has high-frequency current fluctuation exceeding a preset threshold value, the fluctuation current is input into a super capacitor, or the super capacitor is called to supply power to the alkaline electrolytic hydrogen production subsystem, so as to compensate the current fluctuation and stably supply power to the alkaline electrolytic hydrogen production subsystem;
if the output current of the power generation subsystem is lower than the lowest working current of the electrolytic cell, the output current of the power generation subsystem is input into the alkaline electrolysis hydrogen production subsystem, meanwhile, the electrochemical power system is called to supply power to the electrolytic cell system, if the current signal has high-frequency current fluctuation exceeding a preset threshold value, the fluctuation current is input into the super capacitor or the super capacitor is called to compensate the current fluctuation, and the alkaline electrolysis system is stably supplied with power.
Three application examples are provided below to verify the effectiveness of the hybrid hydrogen production system and the control method thereof provided in the present embodiment:
aiming at the characteristics that the current density generated by power generation of renewable energy sources has intermittency and instability, a hybrid hydrogen production system of a coupling alkaline electrolysis system, an electrochemical power source and a super capacitor is provided, wherein the alkaline electrolysis system is an alkaline water electrolysis system, the rated power is 5MW, the hydrogen production efficiency is 1000Nm3/h, and the rated current is 6000A; the electrochemical power supply is a lithium ion battery with the rated power of 2 MW; the super capacitor is an electric double layer capacitor and has a rated power of 0.5 MW. When the current input of the power generation end of the renewable energy source is 8000A, the instantaneous current fluctuates by plus or minus 100A, 6000A stable current is used for hydrogen production of an electrolysis system through current distribution, 2000A charges a lithium ion battery, and the renewable energy source is consumed by high-frequency charge and discharge of a super capacitor to generate the instantaneous current fluctuation in the process.
Aiming at the characteristics that the current density generated by the power generation of the renewable energy source has intermittency and instability, a hybrid hydrogen production system of a coupling alkaline electrolysis system, an electrochemical power source and a super capacitor is provided, wherein the alkaline electrolysis system is an alkaline water electrolysis system, the rated power is 5MW, the hydrogen production efficiency is 1000Nm3/h, and the rated current is 6000A; the electrochemical power supply is a lithium ion battery, and the rated power is 2 MW; the super capacitor is an electric double layer capacitor and has a rated power of 0.5 MW. When the current input of the power generation end of the renewable energy source is 4000A, the instantaneous current fluctuates by plus or minus 100A, the working input current of the electrolysis system for generating hydrogen is stabilized at 5000A through current distribution, wherein the 1000A current is provided by a lithium ion battery, and the instantaneous current fluctuation is generated by using the high-frequency charge and discharge of a super capacitor to absorb the renewable energy source in the process.
Aiming at the characteristics that the current density generated by the power generation of the renewable energy source has intermittence and instability, a hybrid hydrogen production system of a coupling alkaline electrolysis system, an electrochemical power source and a super capacitor is provided, wherein the alkaline electrolysis system is an alkaline water electrolysis system, the rated power is 5MW, the hydrogen production efficiency is 1000Nm3/h, and the rated current is 6000A; the electrochemical power supply is a lithium ion battery with the rated power of 2 MW; the super capacitor is an electric double layer capacitor and has a rated power of 0.5 MW. When the current input of the power generation end of the renewable energy source is 1000A, the instantaneous current fluctuates by plus or minus 50A, the working input current of hydrogen production of the electrolysis system is stabilized at 1200A (the lowest working current) through current distribution, wherein the 200A current is provided by the lithium ion battery, and the instantaneous current fluctuation is generated by the renewable energy source through high-frequency charging and discharging of the super capacitor in the process.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A hybrid hydrogen production system for coupling an electrochemical power supply and a super capacitor is characterized by comprising an alkaline electrolysis hydrogen production subsystem, a shunting module, the super capacitor, the electrochemical power supply and a power generation subsystem; the power generation subsystem is connected with the shunt module; the super capacitor, the electrochemical power supply and the alkaline electrolytic hydrogen production subsystem are respectively connected to a shunt module; the shunt module inputs stable current into the alkaline electrolytic hydrogen production subsystem according to whether current fluctuation exceeding a preset threshold exists or not, the fluctuation current is input into the super capacitor, and the current higher than the current of the alkaline electrolytic hydrogen production subsystem is input into the super capacitor and the electrochemical power supply.
2. The hybrid hydrogen production system for coupling the electrochemical power supply and the supercapacitor as claimed in claim 1, wherein the alkaline electrolysis hydrogen production subsystem comprises an alkaline water electrolysis hydrogen production device and an alkaline membrane electrolysis hydrogen production device; the alkaline water electrolysis hydrogen production device and the alkaline membrane electrolysis hydrogen production device are respectively connected to the shunting module.
3. The system for hybrid hydrogen production by coupling an electrochemical power supply and a supercapacitor according to claim 2, wherein the alkaline water electrolysis hydrogen production device comprises an alkaline water electrolysis tank, an alkaline water circulation device and a gas-liquid separation device; the alkali liquor circulating equipment and the gas-liquid separating equipment are respectively connected to an alkali liquor electrolytic cell; the alkaline water electrolytic cell is formed by assembling a positive electrode, a negative electrode, a diaphragm and an end plate.
4. The system for hybrid hydrogen production by coupling an electrochemical power supply and a supercapacitor according to claim 3, wherein the alkaline membrane electrolysis hydrogen production device comprises an alkaline water electrolytic tank, an alkaline water circulation device and a gas-liquid separation device; the alkali liquor circulating equipment and the gas-liquid separating equipment are respectively connected to an alkali liquor electrolytic cell; the alkaline water electrolytic cell is formed by assembling a positive electrode, a negative electrode, an alkaline membrane and an end plate.
5. The hybrid hydrogen generation system coupling an electrochemical power source and a supercapacitor according to claim 3 or 4, wherein the number of alkaline water electrolysis cells is single or multiple.
6. The hybrid hydrogen production system by coupling an electrochemical power source and a supercapacitor according to claim 1, wherein the supercapacitor specifically is: a high power density energy storage device.
7. The system for hybrid hydrogen production coupling an electrochemical power source and a supercapacitor of claim 6, wherein the supercapacitor is an electric double layer supercapacitor, a pseudocapacitive supercapacitor, or a battery-capacitor hybrid supercapacitor.
8. The hybrid hydrogen production system by coupling an electrochemical power source and a supercapacitor according to claim 1, wherein the electrochemical power source is specifically: high energy density energy storage devices that store energy through electrochemistry.
9. The hybrid hydrogen generation system coupling an electrochemical power source and a supercapacitor according to claim 8, wherein the electrochemical power source is a lead-acid battery, a nickel-metal hydride battery, a lithium ion battery, a lithium battery, a sodium ion battery, a sodium battery, a bi-ion battery, or an aqueous battery.
10. A control method for the hybrid hydrogen production system of claim 1, wherein the control method comprises:
step 1: the power generation subsystem converts renewable energy into direct current and inputs the direct current into the shunt module;
step 2: the shunt module detects the output current value of the power generation subsystem;
if the output current of the power generation subsystem exceeds the rated current of the electrolytic cell, the current is shunted, 100% of the current required by the working condition is distributed to the alkaline electrolysis hydrogen production subsystem, and the residual current is input into the electrochemical power supply;
when the electrochemical power supply is charged, if the high-frequency current fluctuation exceeding a preset threshold value is detected in the current, the fluctuation current is input to the super capacitor in a shunting manner, and the stable current is input to the electrochemical power supply in a shunting manner;
if the output current of the power generation subsystem is lower than the rated current of the electrolytic bath but higher than the lowest working current of the electrolytic bath, the output current of the power generation subsystem is input into the alkaline electrolysis hydrogen production subsystem, and if the current has high-frequency current fluctuation exceeding a preset threshold value, the fluctuation current is input into the super capacitor, or the super capacitor is called to supply power to the alkaline electrolysis hydrogen production subsystem so as to compensate the current fluctuation and stably supply power to the alkaline electrolysis hydrogen production subsystem;
if the output current of the power generation subsystem is lower than the lowest working current of the electrolytic cell, the output current of the power generation subsystem is input into the alkaline electrolysis hydrogen production subsystem, meanwhile, the electrochemical power system is called to supply power to the electrolytic cell system, if the current signal has high-frequency current fluctuation exceeding a preset threshold value, the fluctuation current is input into the super capacitor or the super capacitor is called to compensate the current fluctuation, and the alkaline electrolysis system is stably supplied with power.
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