CN117614000A - Control method and system for hydrogen production by using new energy sources in off-grid mode - Google Patents

Control method and system for hydrogen production by using new energy sources in off-grid mode Download PDF

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Publication number
CN117614000A
CN117614000A CN202311536726.2A CN202311536726A CN117614000A CN 117614000 A CN117614000 A CN 117614000A CN 202311536726 A CN202311536726 A CN 202311536726A CN 117614000 A CN117614000 A CN 117614000A
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China
Prior art keywords
power
converter
wind turbine
photovoltaic panel
electrolytic tank
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CN202311536726.2A
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Chinese (zh)
Inventor
唐叔贤
金方润
�田�浩
朱船辉
邹志刚
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Chinese University of Hong Kong Shenzhen
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Chinese University of Hong Kong Shenzhen
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Priority to CN202311536726.2A priority Critical patent/CN117614000A/en
Publication of CN117614000A publication Critical patent/CN117614000A/en
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Classifications

    • 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
    • H02J3/388—Islanding, i.e. disconnection of local power supply from the network
    • 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
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/66—Regulating electric power
    • G05F1/67—Regulating electric power to the maximum power available from a generator, e.g. from solar cell
    • 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
    • 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
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • 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
    • H02J2300/26—The renewable source being solar energy of photovoltaic origin involving maximum power point tracking control for photovoltaic sources
    • 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
    • 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 discloses a control method and a system for hydrogen production by using new energy sources which are connected in parallel and disconnected from a network, wherein the method comprises the steps of analyzing and configuring optimal capacities of a photovoltaic panel and a wind turbine generator set based on meteorological data, acquiring current output power of the photovoltaic panel and the wind turbine generator set in real time, and judging whether the working condition of the lowest power of an electrolytic tank is met; if the voltage and the current meet the requirements, the second AC/DC converter is controlled to be not operated, and the output voltage and the output current of the photovoltaic panel and the wind turbine generator are regulated through the DC/DC converter and the first AC/DC converter, so that the voltage and the current relationship input into the electrolytic tank accords with the IV characteristic curve of the electrolytic tank; if the power is not met, tracking the maximum power point of the photovoltaic panel through the DC/DC converter, tracking the maximum power point of the wind turbine generator through the first AC/DC converter, outputting the corresponding voltage with the lowest power of the set electrolytic cell to the electrolytic cell, and adjusting the output current through the second AC/DC converter based on the set minimum power and the set maximum power point to access the power of the power grid to the electrolytic cell. The embodiment realizes high-efficiency hydrogen production, minimizes the power taking scale of the power grid and improves the green hydrogen ratio.

Description

Control method and system for hydrogen production by using new energy sources in off-grid mode
Technical Field
The invention relates to the field of new energy power generation hydrogen production, in particular to a control method and a system for off-grid new energy hydrogen production.
Background
The technology of producing hydrogen by electrolyzing water is an important path for realizing zero carbon emission of hydrogen economy. Among the numerous water electrolysis technologies, alkaline water electrolysis technology has been commercialized for over 100 years, is the most mature and economical technology, and is the best choice for large-scale water electrolysis hydrogen production application at present. However, due to the fluctuation of renewable energy sources, the current large-scale water electrolysis hydrogen production application still depends on stable power grid power supply, and the requirement of green electricity production by renewable energy sources cannot be met.
In the off-grid hydrogen production application, in order to adapt to the fluctuation of new energy input, the existing scheme mostly makes the electrolytic tank work under rated voltage through system configuration to avoid the problem of unstable input, and besides the configuration of a large-capacity energy storage system, the method for changing the number of connected electrolytic tanks or connecting electrolytic tanks with different powers is also included to match the fluctuation of input power, such as connecting electrolytic tanks with different powers in different input ranges, or adjusting the connection number of hydrogen production units in the electrolytic water hydrogen production module according to real-time power generation. However, the capacity of the energy storage unit in the pure off-grid hydrogen production system is difficult to evaluate and often requires a large amount of overdriving, so that the system cost is greatly increased and additional potential safety hazards are increased. The strategy of changing the access quantity and the power of the super-distribution electrolytic tank according to the input power causes low utilization efficiency of the electrolytic tank, causes the idling of equipment, and has no advantages in terms of cost and resource allocation.
In contrast, the off-grid hydrogen production system can control the cost and ensure higher green hydrogen yield ratio, in the prior art, the required power of the hydrogen production unit is obtained through detection and calculation, the control of the off-grid coupling hydrogen production is carried out by adopting different modes, the required power of the hydrogen production unit is obtained through calculation by corresponding resistors under the working voltage and different working temperatures of the electrolytic tank, and the required power is used as the basis for switching different operation modes. However, this calculation method does not take into account the possibility of operating the electrolyzer at different voltages. If the electrolytic tank only works under rated voltage, the electrolytic tank is in an operation mode of jointly supplying power to the photovoltaic wind power and the commercial power for a long time under the condition that the capacity of the new energy side is not greatly over-matched, the green power supply ratio is not high, the green hydrogen output is less, and if the capacity of the new energy is still required to be greatly over-matched, the cost advantage of the system is not as expected.
Disclosure of Invention
The invention provides a control method and a system for hydrogen production by using new energy which is connected and disconnected from a grid, which realize high-efficiency hydrogen production by using new energy which is connected and disconnected from the grid, minimize the scale of electricity taken from the grid and improve the duty ratio of green hydrogen.
In order to solve the technical problems, the embodiment of the invention provides a control method for producing hydrogen by using new energy sources which are connected in parallel and disconnected with each other, which comprises the following steps:
The off-grid new energy hydrogen production control method is executed on an off-grid new energy hydrogen production control system, wherein the off-grid new energy hydrogen production control system comprises the following steps: the photovoltaic power generation system comprises a photovoltaic panel, a DC/DC converter, an electrolytic tank, a wind turbine, a first AC/DC converter, a second AC/DC converter and a power grid;
the photovoltaic panel is connected with the electrolytic tank through a DC/DC converter, the wind turbine generator is connected with the electrolytic tank through a first AC/DC converter, and the electrolytic tank is connected with the power grid through a second AC/DC converter;
the off-grid new energy hydrogen production control method comprises the following steps:
acquiring current output power of the photovoltaic panel and the wind power generation set in real time, acquiring current new energy output power, and judging whether the current new energy output power meets the minimum power working condition; the lowest power working condition is that the current new energy output power is enough to maintain the electrolytic tank to work under the set lowest power;
if the voltage and current relationship of the photovoltaic panel and the wind turbine generator set is met, the second AC/DC converter is controlled to be not operated, and the output voltage and current of the photovoltaic panel and the wind turbine generator set are regulated through the DC/DC converter and the first AC/DC converter, so that the voltage and current relationship of the input electrolytic tank is in accordance with the IV characteristic curve of the electrolytic tank, and the electrolytic tank is controlled to couple the photovoltaic panel and the wind turbine generator set to perform hydrogen production operation;
If the power is not met, tracking the maximum power point of the photovoltaic panel through the DC/DC converter, tracking the maximum power point of the wind turbine generator through the first AC/DC converter, outputting the power point to the electrolytic tank with the corresponding voltage with the set minimum power, adjusting the output current through the second AC/DC converter based on the set minimum power, the maximum power point of the photovoltaic panel and the maximum power point of the wind turbine generator, and accessing the power of the power grid to the electrolytic tank to control the electrolytic tank to perform hydrogen production under the set minimum power.
By implementing the embodiment of the invention, the current output power of the photovoltaic panel and the wind turbine generator system is obtained in real time, the current new energy output power is obtained, and whether the current new energy output power meets the minimum power working condition is judged; the lowest power working condition is that the current new energy output power is enough to maintain the electrolytic tank to work under the set lowest power; if the voltage and current relationship of the photovoltaic panel and the wind turbine generator set is met, the second AC/DC converter is controlled to be not operated, and the output voltage and current of the photovoltaic panel and the wind turbine generator set are regulated through the DC/DC converter and the first AC/DC converter, so that the voltage and current relationship of the input electrolytic tank is in accordance with the IV characteristic curve of the electrolytic tank, and the electrolytic tank is controlled to couple the photovoltaic panel and the wind turbine generator set to perform hydrogen production operation; if the power is not met, tracking the maximum power point of the photovoltaic panel through the DC/DC converter, tracking the maximum power point of the wind turbine generator through the first AC/DC converter, outputting the power point to the electrolytic tank with the corresponding voltage with the set minimum power, adjusting the output current through the second AC/DC converter based on the set minimum power, the maximum power point of the photovoltaic panel and the maximum power point of the wind turbine generator, and accessing the power of the power grid to the electrolytic tank to control the electrolytic tank to perform hydrogen production under the set minimum power. The power supply of a small amount of power grid reaches the working mode that the power supply is not turned off after the power-on of the electrolytic cell, the scale of taking power from the power grid is minimized, the energy waste and the structural damage caused by frequent start and stop of the electrolytic cell in one day are avoided, the power taking from the power grid is stopped when the normal operation of the electrolytic cell can be ensured by the input of a new energy side, and only the power grid is used for supporting the lower limit power (the minimum power is set) of the electrolytic cell which can safely operate. When the input power of the new energy side fluctuates, the power electronic converter is used for quickly matching the voltage and current output by the new energy with the IV characteristic curve of the electrolytic tank, so that the efficient off-grid new energy hydrogen production is realized, the energy for hydrogen production is mainly provided by renewable energy, the green hydrogen duty ratio is greatly improved, the new energy power can be efficiently output to the electrolytic tank when the novel energy side operates under the non-rated voltage, and compared with the existing off-grid hydrogen production system scheme, the operation mode of the off-grid hydrogen production system is more optimized, and the green hydrogen output duty ratio is higher.
As a preferred scheme, before obtaining current output power of the photovoltaic panel and the wind turbine generator system in real time and obtaining current new energy output power, the method further comprises:
carrying out data analysis on the local historical meteorological data, configuring the optimal capacity of the photovoltaic panel and the wind turbine generator so that the sum of the maximum output power of the photovoltaic panel and the maximum output power of the wind turbine generator is lower than the maximum load allowed by the electrolytic cell, and optimizing new energy power available for the operation of the electrolytic cell in one day;
wherein the local historical meteorological data includes wind speed data and solar irradiance data.
As a preferred scheme, carrying out data analysis on local historical meteorological data, and configuring optimal capacities of a photovoltaic panel and a wind turbine generator, wherein the optimal capacities are specifically as follows:
analyzing the wind speed data and solar irradiance data of the past decade in the local area every hour, calculating the average value of the wind speed and the solar irradiance of the past decade every hour, and obtaining the relation between the capacity of the configured wind turbine generator set and the capacity of the photovoltaic panel and the expected output power according to the average value of the wind speed and the solar irradiance;
based on preset electrolytic tank capacity, photovoltaic cost, wind power cost and commercial power price, constraint conditions are applied to the configured capacity of the wind turbine generator and the capacity of the photovoltaic panel as variables, and the optimal solution of the configured capacity of the wind turbine generator and the capacity of the photovoltaic panel is solved with the minimum hydrogen production cost as a target, so that the optimal capacities of the configured photovoltaic panel and the wind turbine generator are obtained.
The constraint conditions comprise that the total annual hydrogen production amount is not smaller than the target hydrogen production amount designated by a user, the sum of the output power of the photovoltaic panel and the wind turbine generator set at any moment is not larger than the upper limit of the operable power of the electrolytic cell, and the annual power grid electricity taking amount is not larger than a preset electricity taking value.
As a preferable scheme, the output voltage and current of the photovoltaic panel and the wind turbine generator are regulated through the DC/DC converter and the first AC/DC converter, so that the voltage-current relationship of the input electrolytic tank accords with the IV characteristic curve of the electrolytic tank, and the method specifically comprises the following steps:
controlling a front-stage tracking photovoltaic panel maximum power point of the DC/DC converter by using a disturbance observation method;
the output voltage and current of the photovoltaic panel are regulated through the rear stage of the DC/DC converter, so that the voltage and current input into the electrolytic tank accord with the I V characteristic curve of the electrolytic tank;
controlling a front stage of a first AC/DC converter to track a maximum power point of a wind turbine by using a preset fan tracking method; the preset fan tracking method comprises at least one of a power signal feedback method, an optimal torque method, a conductivity increment method and a disturbance observation method;
and adjusting the output voltage and current of the wind turbine generator set through the rear stage of the first AC/DC converter, so that the voltage and current input into the electrolytic tank accord with the IV characteristic curve of the electrolytic tank.
As a preferable scheme, the output voltage and current of the photovoltaic panel are adjusted to be in accordance with the IV characteristic curve of the electrolytic cell through the rear stage of the DC/DC converter, specifically:
the back stage of the DC/DC converter adjusts the output voltage and current of the photovoltaic panel by adjusting the duty ratio so as to maintain the balance between the output power and the input power of the DC/DC converter, and the voltage and the current input into the electrolytic tank are in accordance with the IV characteristic curve of the electrolytic tank.
As a preferable scheme, the output voltage and current of the wind turbine generator set are adjusted to be in accordance with the IV characteristic curve of the electrolytic tank through the rear stage of the first AC/DC converter, and the method specifically comprises the following steps:
the back stage of the first AC/DC converter adjusts the output voltage and current of the wind turbine generator set by adjusting the duty ratio so as to maintain the balance between the output power and the input power of the first AC/DC converter, and the voltage and the current input into the electrolytic tank are enabled to accord with the IV characteristic curve of the electrolytic tank.
As a preferred scheme, tracking the maximum power point of the photovoltaic panel through the DC/DC converter, tracking the maximum power point of the wind turbine generator through the first AC/DC converter, and outputting the maximum power point to the electrolytic cell with the corresponding voltage with the set minimum power, specifically:
controlling a front-stage tracking photovoltaic panel maximum power point of the DC/DC converter by using a disturbance observation method;
the output voltage of the photovoltaic panel is adjusted to be the corresponding voltage with the set minimum power through the rear stage of the DC/DC converter, and the voltage is input to the electrolytic tank with the corresponding voltage with the set minimum power; the corresponding voltage with the lowest power is set and obtained by testing the electrolytic tank;
Controlling a front stage of a first AC/DC converter to track a maximum power point of a wind turbine by using a preset fan tracking method; the preset fan tracking method comprises at least one of a power signal feedback method, an optimal torque method, a conductivity increment method and a disturbance observation method;
and adjusting the output voltage of the wind turbine generator to be the corresponding voltage with the set minimum power through the rear stage of the first AC/DC converter, and inputting the corresponding voltage with the set minimum power into the electrolytic tank.
In order to solve the same technical problems, the embodiment of the invention also provides a new energy hydrogen production control system which is connected with and disconnected from the network, comprising: the photovoltaic power generation system comprises a photovoltaic panel, a DC/DC converter, an electrolytic tank, a wind turbine generator, a first AC/DC converter, a second AC/DC converter, a power grid and a control module;
the photovoltaic panel is connected with the electrolytic tank through a DC/DC converter, the wind turbine generator is connected with the electrolytic tank through a first AC/DC converter, the electrolytic tank is connected with the power grid through a second AC/DC converter, and the control module is respectively connected with the photovoltaic panel, the DC/DC converter, the electrolytic tank, the wind turbine generator, the first AC/DC converter, the second AC/DC converter and the power grid;
the control module is used for executing the off-grid new energy hydrogen production control method.
Preferably, the control module includes: acquiring a power unit, a new energy power supply unit and a power grid participation power supply unit;
the power obtaining unit is used for obtaining current output power of the photovoltaic panel and the wind power generator set in real time, obtaining current new energy output power and judging whether the current new energy output power meets the minimum power working condition; the lowest power working condition is that the current new energy output power is enough to maintain the electrolytic tank to work under the set lowest power;
the new energy power supply unit is used for controlling the second AC/DC converter to be not operated if the current new energy output power meets the minimum power working condition, and regulating the output voltage and current of the photovoltaic panel and the wind turbine generator through the DC/DC converter and the first AC/DC converter to enable the voltage and current relationship of the input electrolytic tank to be in accordance with the IV characteristic curve of the electrolytic tank so as to control the electrolytic tank to couple the photovoltaic panel and the wind turbine generator to perform hydrogen production;
and the power grid participation power supply unit is used for tracking the maximum power point of the photovoltaic panel through the DC/DC converter if the current new energy output power does not meet the minimum power working condition, tracking the maximum power point of the wind turbine generator through the first AC/DC converter, outputting the voltage to the electrolytic cell with the corresponding voltage with the set minimum power, and switching the power of the power grid into the electrolytic cell through the second AC/DC converter by adjusting the output current based on the set minimum power, the maximum power point of the photovoltaic panel and the maximum power point of the wind turbine generator set so as to control the electrolytic cell to carry out hydrogen production work under the set minimum power.
Preferably, the control module further includes: a capacity allocation unit;
the capacity configuration unit is used for carrying out data analysis on the local historical meteorological data, configuring the optimal capacities of the photovoltaic panel and the wind turbine generator so that the sum of the maximum output power of the photovoltaic panel and the maximum output power of the wind turbine generator is lower than the maximum load allowed by the electrolytic cell, and optimizing new energy power available for the operation of the electrolytic cell in one day; wherein the local historical meteorological data includes wind speed data and solar irradiance data.
The invention has the following advantages:
(1) When the input of new energy power is too low, the basic power support can be obtained from the power grid to maintain the operation of the electrolytic tank, the effect that the electrolytic tank is not shut down after being started is achieved, and the energy waste and the structural damage caused by frequent start and stop of the system are avoided.
(2) Compared with the existing grid-connected hydrogen production system, the energy for producing hydrogen is mainly provided by renewable energy sources, and the green hydrogen duty ratio is greatly improved. Compared with the existing off-grid hydrogen production system scheme, the system operation mode is optimized, and the working range of the system is widened.
(3) Compared with the scheme of the existing superdistribution electrolytic tank and the energy storage system, the capacity of the energy storage system can be greatly reduced, even the introduction of the energy storage system is avoided, the electrolytic tank does not need superdistribution, the equipment utilization rate is improved, and the cost is reduced.
Drawings
Fig. 1: a flow diagram of one embodiment of the control method for producing hydrogen by using new energy sources which are connected in parallel and disconnected in the invention;
fig. 2: the connection schematic diagram of the off-grid new energy hydrogen production control system of one embodiment of the off-grid new energy hydrogen production control method is provided by the invention;
fig. 3: the invention provides a structural schematic diagram of an embodiment of a new energy hydrogen production control system which is connected with and disconnected from the network;
fig. 4: the invention provides a control module diagram of an embodiment of a new energy hydrogen production control system which is connected with and disconnected from the grid.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Referring to fig. 1, a flow chart of a control method for producing hydrogen from new energy in parallel and off-grid according to an embodiment of the invention is shown. According to the embodiment, the new energy output is combined with the control of the power taking state of the converter and the power grid, the new energy is efficiently used for hydrogen production, the power taking scale from the power grid is minimized, and the green hydrogen duty ratio is improved. The off-grid new energy hydrogen production control method is executed on an off-grid new energy hydrogen production control system, wherein the off-grid new energy hydrogen production control system comprises the following steps: the photovoltaic power generation system comprises a photovoltaic panel, a DC/DC converter, an electrolytic tank, a wind turbine, a first AC/DC converter, a second AC/DC converter and a power grid;
The photovoltaic panel is connected with the electrolytic tank through the DC/DC converter, the wind turbine generator is connected with the electrolytic tank through the first AC/DC converter, and the electrolytic tank is connected with the power grid through the second AC/DC converter.
In this embodiment, as shown in fig. 2, the connection schematic diagram of the off-grid new energy hydrogen production control system is that the photovoltaic panel, the DC/DC converter, the wind turbine generator and the first AC/DC converter are used as new energy sides to supply power to the electrolyzer, and the AC/DC converter in the wind power side corresponding to the wind turbine generator and the first AC/DC converter needs a wider voltage conversion range, so that a higher requirement is placed on the topology structure design. The second AC/DC converter and the grid serve as a grid side for supplying the electrolyzer, and the grid side AC/DC converter only needs to achieve a fixed voltage conversion, acting to maintain the minimum voltage required by the electrolyzer.
The off-grid new energy hydrogen production control method comprises steps 101 to 104, wherein the steps are as follows:
step 101: carrying out data analysis on the local historical meteorological data, configuring the optimal capacity of the photovoltaic panel and the wind turbine generator so that the sum of the maximum output power of the photovoltaic panel and the maximum output power of the wind turbine generator is lower than the maximum load allowed by the electrolytic cell, and optimizing new energy power available for the operation of the electrolytic cell in one day; wherein the local historical meteorological data includes wind speed data and solar irradiance data.
In this embodiment, the capacities of the photovoltaic panel and the wind turbine generator are determined according to the local historical meteorological data such as illumination and wind resources of the system location, and the sum of the maximum output power of the photovoltaic panel and the wind turbine generator is lower than the maximum load allowed by the electrolytic cell, such as 120% of the rated power of the electrolytic cell, due to the fact that the grid output is used as a support, and new energy power available for operation of the electrolytic cell in one day is optimized. When the system works, solar irradiance and wind speed information is measured in real time, and corresponding storage is carried out, so that the capacity of the photovoltaic panel, the wind turbine generator and the electrolytic tank can be adjusted by later-stage calling of historical meteorological data.
It should be noted that, wind power is lower at noon, photovoltaic output is higher at this moment, and photovoltaic output is lower at the morning and evening, and wind power output is higher at this moment. Through the summarization and analysis of the local historical meteorological data, the capacities of the wind power and the photovoltaic system are reasonably configured, so that the fluctuation of the wind power and the photovoltaic system can be mutually stabilized, and the frequency and the energy for taking electricity from a power grid are reduced.
Optionally, step 101 specifically includes steps 1011 to 1012, each of which specifically includes the following steps:
step 1011: and analyzing the wind speed data and solar irradiance data of the past decade in the local area every hour, calculating the average value of the wind speed and the solar irradiance of the past decade every hour, and obtaining the relation between the capacity of the configured wind turbine generator set and the capacity of the photovoltaic panel and the expected output power according to the average value of the wind speed and the solar irradiance.
In this embodiment, the average value of the wind speed and solar irradiance in each hour in the past decade can be estimated by analyzing the wind speed and solar irradiance data in each hour in the past decade, so that the expected output power of wind turbines and photovoltaic panels with different capacities can be obtained, namely, the relation between the capacity of the wind turbines and the capacity of the photovoltaic panels with the expected output power.
Step 1012: based on preset electrolytic tank capacity, photovoltaic cost, wind power cost and commercial power price, constraint conditions are applied to the configured capacity of the wind turbine generator and the capacity of the photovoltaic panel as variables, and the optimal solution of the configured capacity of the wind turbine generator and the capacity of the photovoltaic panel is solved with the minimum hydrogen production cost as a target, so that the optimal capacities of the configured photovoltaic panel and the wind turbine generator are obtained.
Optionally, the constraint condition includes that the total annual hydrogen production is not smaller than the target hydrogen production designated by the user, the sum of the output power of the photovoltaic panel and the wind turbine generator set at any moment is not larger than the upper limit of the operable power of the electrolytic cell, and the annual power grid electricity consumption does not exceed a preset electricity consumption value.
In this embodiment, the grid supports the electrolyzer at a minimum set power when the wind and photovoltaic output power is insufficient. Given the capacity of the electrolytic cell (preset capacity of the electrolytic cell), the capacity of the configured wind turbine generator set and the capacity of the photovoltaic system are used as variables under the conditions of known photovoltaic, wind power cost and commercial power price, and corresponding constraint conditions are applied, such as: the total annual hydrogen production is not less than the target hydrogen production designated by the user, the annual power grid power consumption is not more than a certain value, and the sum of the output power of the photovoltaic panel and the wind turbine generator set at any moment is not more than the upper limit of the operable power of the electrolytic cell. And (5) obtaining the optimal capacity of each wind power and photovoltaic system by taking the lowest hydrogen production cost as a target.
Step 102: acquiring current output power of the photovoltaic panel and the wind turbine generator in real time, acquiring current new energy output power, and judging whether the current new energy output power meets the minimum power working condition; the lowest power working condition is that the current new energy output power is enough to maintain the electrolytic tank to work under the set lowest power.
Step 103: and if the current new energy output power meets the minimum power working condition, controlling the second AC/DC converter to be not operated, and regulating the output voltage and current of the photovoltaic panel and the wind turbine generator through the DC/DC converter and the first AC/DC converter to enable the voltage and current relationship of the input electrolytic tank to be in accordance with the I V characteristic curve of the electrolytic tank so as to control the electrolytic tank to couple the photovoltaic panel and the wind turbine generator to perform hydrogen production.
In this embodiment, when the output power of the photovoltaic panel and the wind turbine generator system can meet the requirement that the electrolyzer works under the set minimum power, that is, the current new energy output power meets the minimum power working condition of the electrolyzer, the power grid side switch is turned off, that is, the second AC/DC converter is controlled to be not operated, the output voltages of the photovoltaic panel and the wind turbine generator system are regulated through the DC/DC converter and the first AC/DC converter, and characteristics of the electrolyzer are matched when the output of the new energy side fluctuates, so that the voltage and current relationship input into the electrolyzer accords with the IV characteristic curve of the electrolyzer. Since the electrolytic cell has its operating characteristics, and has a one-to-one correspondence between voltage, current and power under the same external conditions (temperature, etc.), it can be regarded as a resistive load when connected to a photovoltaic panel.
Optionally, the output voltage and current of the photovoltaic panel and the wind turbine generator are regulated through the DC/DC converter and the first AC/DC converter, so that the voltage-current relationship of the input electrolytic tank accords with the IV characteristic curve of the electrolytic tank, and the method specifically comprises the steps S31 to S34, and specifically comprises the following steps:
s31: and controlling the front stage of the DC/DC converter to track the maximum power point of the photovoltaic panel by using a disturbance observation method.
S32: and regulating the output voltage and current of the photovoltaic panel through the rear stage of the DC/DC converter, so that the regulated voltage and current accord with the I V characteristic curve of the electrolytic tank.
Optionally, step S32 specifically includes: the back stage of the DC/DC converter adjusts the output voltage and current of the photovoltaic panel by adjusting the duty ratio so as to maintain the balance between the output power and the input power of the DC/DC converter, and the voltage and the current input into the electrolytic tank are in accordance with the IV characteristic curve of the electrolytic tank.
In this embodiment, the DC/DC converter has a two-stage structure, the front stage tracks the maximum power point of the photovoltaic panel by a disturbance observation method, and the rear stage adjusts the output voltage and current by adjusting the duty ratio to maintain the balance between the output and input power. The voltage and current input into the cell can thus be adapted to the IV characteristic of the cell by means of a later adjustment in the event that the photovoltaic maximum power is already obtained in the preceding stage, but the voltage and current of the photovoltaic output does not match the cell.
S33: controlling a front stage of a first AC/DC converter to track a maximum power point of a wind turbine by using a preset fan tracking method; the preset fan tracking method comprises at least one of a power signal feedback method, an optimal torque method, a conductivity increment method and a disturbance observation method.
In this embodiment, since the maximum power tracking method of the wind turbine generator is classified into two types, i.e., direct and indirect, different methods may be configured differently, and the preset wind turbine tracking method includes a power signal feedback method, an optimal torque method, a conductance increment method, and a disturbance observation method, if the wind turbine performs maximum power tracking by the indirect methods such as the power signal feedback method, the optimal torque method, etc., the front stage only needs to perform AC/DC rectification. If the wind turbine generator tracks the maximum power through a disturbance observation method, a conductance increment method and other direct methods, the front stage may comprise a stage AC/DC and a stage DC/DC. The core idea of the AC/DC converter for the matching electrolytic tank of the wind turbine generator is the same as that of the DC/DC converter of the photovoltaic panel, namely, the maximum power tracking and the matching electrolytic tank are carried out separately, so that the voltage and the current input into the electrolytic tank accord with the IV characteristic curve of the electrolytic tank.
S34: and adjusting the output voltage and current of the wind turbine generator set to be in accordance with the IV characteristic curve of the electrolytic tank through the rear stage of the first AC/DC converter.
Optionally, step S34 specifically includes: the back stage of the first AC/DC converter adjusts the output voltage and current of the wind turbine generator set by adjusting the duty ratio so as to maintain the balance between the output power and the input power of the first AC/DC converter, and the voltage and the current input into the electrolytic tank are enabled to accord with the IV characteristic curve of the electrolytic tank.
In this embodiment, the first AC/DC converter is also of a multi-stage structure, and after the front stage tracks the maximum power of wind power by direct or indirect method, the DC/DC converter unit of the rear stage adjusts the output voltage and current to maintain the balance between the output and input power. When connected with the electrolytic tank, the DC/DC converter unit at the rear stage of the first AC/DC converter adjusts the output voltage and current so that the voltage and current input into the electrolytic tank conform to the IV characteristic curve of the electrolytic tank.
Step 104: if the current output power of the new energy does not meet the minimum power working condition, tracking the maximum power point of the photovoltaic panel through the DC/DC converter, tracking the maximum power point of the wind turbine generator through the first AC/DC converter, outputting the voltage to the electrolytic cell with the corresponding voltage with the set minimum power, and adjusting the output current through the second AC/DC converter based on the set minimum power, the maximum power point of the photovoltaic panel and the maximum power point of the wind turbine generator set, so as to control the electrolytic cell to perform hydrogen production under the set minimum power.
In this embodiment, when the output power of the photovoltaic panel and the wind turbine generator is insufficient to maintain the operation of the electrolyzer at the set minimum power, that is, the current output power of the new energy does not meet the operation condition of the minimum power of the electrolyzer, the maximum power point of the photovoltaic panel and the wind turbine generator is tracked and output at the corresponding voltage of the set minimum power, the power grid side switch is opened to control the second AC/DC converter to operate, at this time, the power grid power is connected to the electrolyzer through the second AC/DC converter to enable the electrolyzer to operate at the set minimum power, and the control that the renewable energy power is supported by the main power grid to produce hydrogen for the auxiliary coupling electrolyzer is performed, at this time, the renewable energy and the power grid supply power to the electrolyzer simultaneously. The DC/DC converter and the first AC/DC converter are output with the set minimum voltage (the voltage corresponding to the set minimum power), and the second AC/DC converter connected with the power grid can automatically adjust the output current for maintaining the set voltage because the output current is insufficient to maintain the set voltage, so that the photovoltaic power and the difference value between the wind turbine generator power and the set minimum power of the electrolytic tank can be output.
Optionally, tracking the maximum power point of the photovoltaic panel through the DC/DC converter, tracking the maximum power point of the wind turbine generator through the first AC/DC converter, and outputting the maximum power point to the electrolytic cell at a voltage corresponding to the set minimum power, wherein the steps comprise steps S41 to S44, and specifically the steps are as follows:
S41: and controlling the front stage of the DC/DC converter to track the maximum power point of the photovoltaic panel by using a disturbance observation method.
In this embodiment, the DC/DC converter has a two-stage structure, the front stage is responsible for tracking the maximum power point, and the rear stage automatically adjusts the output current according to the input power of the front stage to maintain the balance between the output and the input power.
S42: the output voltage of the photovoltaic panel is adjusted to be the corresponding voltage with the set minimum power through the rear stage of the DC/DC converter, and the voltage is input to the electrolytic tank with the corresponding voltage with the set minimum power; the corresponding voltage with the lowest power is set and obtained by testing the electrolytic tank;
in this embodiment, the voltage value corresponding to the set minimum power is found by testing the electrolytic cell, and the AC/DC converter (second AC/DC converter) connected to the power grid is maintained at the minimum voltage. When the voltage of the new energy input electrolytic tank is larger than or equal to a set value, the AC/DC converter connected with the power grid cannot output.
S43: controlling a front stage of a first AC/DC converter to track a maximum power point of a wind turbine by using a preset fan tracking method; the preset fan tracking method comprises at least one of a power signal feedback method, an optimal torque method, a conductivity increment method and a disturbance observation method.
S44: and adjusting the output voltage of the wind turbine generator to be the corresponding voltage with the set minimum power through the rear stage of the first AC/DC converter, and inputting the corresponding voltage with the set minimum power into the electrolytic tank.
By implementing the embodiment of the invention, the difficult problem that the large-scale hydrogen production equipment is difficult to adapt to the fluctuation renewable energy source can be solved, the illumination and wind resources are efficiently utilized by tracking and matching the characteristic curve of the electrolytic tank through the maximum power point, the power grid only plays a supporting role in a short time, the system flexibility is ensured, the green hydrogen ratio of the system output is ensured, and meanwhile, the use of an energy storage system can be reduced or even avoided, so that the hydrogen production cost is greatly reduced.
As an example of the embodiment, the hydrogen production system of the 100kW photovoltaic and power grid coupled electrolytic cell has the system capacity of 100kW of the alkaline electrolytic cell, the lowest power of the electrolytic cell is set to be 30kW, the corresponding voltage of the lowest power of the electrolytic cell is set to be V0, and the capacity of the photovoltaic panel is set to be 100kW. When the illumination condition is ideal, if the loss of the DC/DC converter is not considered, the DC/DC converter outputs 100kW, the running power of the electrolytic tank is 100kW, and electricity is not required to be taken from a power grid. When the illumination condition is poor, the output power of the photovoltaic panel is 20kW, and the system controller compares the photovoltaic output power with the lowest power set by the electrolytic cell, so that the current new energy output power is judged not to meet the lowest power working condition. The DC/DC converter needs to regulate its output voltage to V0 while 10kW is drawn from the grid through the AC/DC converter and fed into the electrolyzer at V0 voltage. When the illumination condition is good, the output power of the photovoltaic is 80kW, electricity taking from the power grid is stopped, and the DC/DC converter regulates the output voltage of the photovoltaic to enable the running power of the electrolytic tank to reach 80kW.
By implementing the embodiment of the invention, the invention has the following advantages:
(1) When the input of new energy power is too low, the basic power support can be obtained from the power grid to maintain the operation of the electrolytic tank, the effect that the electrolytic tank is not shut down after being started is achieved, and the energy waste and the structural damage caused by frequent start and stop of the system are avoided.
(2) Compared with the existing grid-connected hydrogen production system, the energy for producing hydrogen is mainly provided by renewable energy sources, and the green hydrogen duty ratio is greatly improved. Compared with the existing off-grid hydrogen production system scheme, the system operation mode is optimized, and the working range of the system is widened.
(3) Compared with the scheme of the existing superdistribution electrolytic tank and the energy storage system, the capacity of the energy storage system can be greatly reduced, even the introduction of the energy storage system is avoided, the electrolytic tank does not need superdistribution, the equipment utilization rate is improved, and the cost is reduced.
Example two
Correspondingly, referring to fig. 3, fig. 3 is a schematic structural diagram of a second embodiment of the off-grid new energy hydrogen production control system provided by the invention. As shown in fig. 3, the off-grid new energy hydrogen production control system comprises a photovoltaic panel, a DC/DC converter, an electrolytic cell, a wind turbine generator, a first AC/DC converter, a second AC/DC converter, a power grid and a control module;
The photovoltaic panel is connected with the electrolytic tank through a DC/DC converter, the wind turbine generator is connected with the electrolytic tank through a first AC/DC converter, the electrolytic tank is connected with the power grid through a second AC/DC converter, and the control module is respectively connected with the photovoltaic panel, the DC/DC converter, the electrolytic tank, the wind turbine generator, the first AC/DC converter, the second AC/DC converter and the power grid;
the control module is used for executing the off-grid new energy hydrogen production control method.
Optionally, the control module of the off-grid new energy hydrogen production control system, as shown in fig. 4, includes: a capacity configuration unit 401, an acquisition power unit 402, a new energy power supply unit 403 and a grid participation power supply unit 404;
the capacity configuration unit 401 is used for performing data analysis on the local historical meteorological data, configuring the optimal capacities of the photovoltaic panel and the wind turbine generator so that the sum of the maximum output power of the photovoltaic panel and the maximum output power of the wind turbine generator is lower than the maximum load allowed by the electrolytic cell, and optimizing new energy power available for the operation of the electrolytic cell in one day; wherein the local historical meteorological data includes wind speed data and solar irradiance data.
The power acquisition unit 402 is used for acquiring current output power of the photovoltaic panel and the wind turbine generator system in real time, acquiring current new energy output power, and judging whether the current new energy output power meets the minimum power working condition; the lowest power working condition is that the current new energy output power is enough to maintain the electrolytic tank to work under the set lowest power;
The new energy power supply unit 403 is configured to control the second AC/DC converter to be not operated if the current new energy output power meets the minimum power operating condition, and adjust the output voltage and current of the photovoltaic panel and the wind turbine generator through the DC/DC converter and the first AC/DC converter, so that the voltage-current relationship of the input electrolytic tank accords with the IV characteristic curve of the electrolytic tank, so as to control the electrolytic tank to couple the photovoltaic panel and the wind turbine generator to perform hydrogen production;
the grid participation power supply unit 404 is configured to track a maximum power point of the photovoltaic panel through the DC/DC converter if the current new energy output power does not meet the minimum power working condition, track the maximum power point of the wind turbine generator through the first AC/DC converter, output the voltage to the electrolyzer with a corresponding voltage with a set minimum power, and adjust the output current through the second AC/DC converter based on the set minimum power, the maximum power point of the photovoltaic panel and the maximum power point of the wind turbine generator set, so as to control the electrolyzer to perform hydrogen production operation under the set minimum power.
By implementing the embodiment of the invention, the working mode that the power supply of a small amount of power grids is achieved without shutdown after the power-on of the electrolytic tank is achieved, the scale of power taking from the power grids is minimized, the energy waste and the structural damage caused by frequent start-up and stop of the electrolytic tank in one day are avoided, the power taking from the power grids is stopped when the normal operation of the electrolytic tank can be ensured by the input of a new energy side, and only the power grids are used for supporting the lower limit power (the minimum power is set) of the electrolytic tank which can safely operate. When the input power of the new energy source side fluctuates, the power electronic converter is used for quickly matching the voltage and current output by the new energy source with the IV characteristic curve of the electrolytic tank, so that the efficient and off-grid new energy source hydrogen production is realized, the energy for hydrogen production is mainly provided by renewable energy sources, the green hydrogen duty ratio is greatly improved, the new energy source power and the like can be output to the electrolytic tank when the novel energy source side operates under the non-rated voltage, and compared with the existing off-grid hydrogen production system scheme, the operation mode of the off-grid hydrogen production system is optimized, and the working range of the system is widened.
The control system for producing hydrogen by using the new energy source in a parallel and off-grid mode can implement the control method for producing hydrogen by using the new energy source in a parallel and off-grid mode in the embodiment of the method. The options in the method embodiments described above are also applicable to this embodiment and will not be described in detail here. The rest of the embodiments of the present application may refer to the content of the method embodiments described above, and in this embodiment, no further description is given.
The foregoing embodiments have been provided for the purpose of illustrating the general principles of the present invention, and are not to be construed as limiting the scope of the invention. It should be noted that any modifications, equivalent substitutions, improvements, etc. made by those skilled in the art without departing from the spirit and principles of the present invention are intended to be included in the scope of the present invention.

Claims (10)

1. The control method for producing hydrogen by using the new energy source in a parallel and off-grid mode is characterized by comprising the following steps of: the online and offline new energy hydrogen production control method is executed on an online and offline new energy hydrogen production control system, wherein the online and offline new energy hydrogen production control system comprises the following steps: the photovoltaic power generation system comprises a photovoltaic panel, a DC/DC converter, an electrolytic tank, a wind turbine, a first AC/DC converter, a second AC/DC converter and a power grid;
The photovoltaic panel is connected with the electrolytic tank through the DC/DC converter, the wind turbine generator is connected with the electrolytic tank through the first AC/DC converter, and the electrolytic tank is connected with the power grid through the second AC/DC converter;
the control method for the hydrogen production by the new energy source of the off-grid system comprises the following steps:
acquiring current output power of the photovoltaic panel and the wind turbine generator in real time, acquiring current new energy output power, and judging whether the current new energy output power meets the minimum power working condition; the lowest power working condition is that the current new energy output power is enough to maintain the electrolytic tank to work under the set lowest power;
if yes, the second AC/DC converter is controlled to be not operated, and the output voltage and current of the photovoltaic panel and the wind turbine generator are regulated through the DC/DC converter and the first AC/DC converter, so that the voltage and current relationship input into the electrolytic tank accords with the IV characteristic curve of the electrolytic tank, and the electrolytic tank is controlled to be coupled with the photovoltaic panel and the wind turbine generator to produce hydrogen;
if the power is not met, tracking a maximum power point of a photovoltaic panel through the DC/DC converter, tracking a maximum power point of a wind turbine generator through the first AC/DC converter, outputting the voltage to the electrolytic cell with the corresponding voltage with the set minimum power, and adjusting output current through the second AC/DC converter to enable the power of the power grid to be connected into the electrolytic cell based on the set minimum power, the maximum power point of the photovoltaic panel and the maximum power point of the wind turbine generator so as to control the electrolytic cell to perform hydrogen production operation under the set minimum power.
2. The method for controlling hydrogen production by using new energy from off-grid as set forth in claim 1, further comprising, before the obtaining current output power of the photovoltaic panel and the wind turbine in real time and obtaining current output power of the new energy:
carrying out data analysis on local historical meteorological data, configuring the optimal capacity of the photovoltaic panel and the wind turbine generator so that the sum of the maximum output power of the photovoltaic panel and the maximum output power of the wind turbine generator is lower than the maximum load allowed by the electrolytic cell, and optimizing new energy power available for the operation of the electrolytic cell in one day;
wherein the local historical meteorological data comprises wind speed data and solar irradiance data.
3. The method for controlling hydrogen production by using new energy sources from the grid as claimed in claim 2, wherein the data analysis is performed on the local historical meteorological data, and the optimal capacities of the photovoltaic panel and the wind turbine generator are configured specifically as follows:
analyzing the wind speed data and the solar irradiance data of the past decade in the local area per hour, calculating the average value of the wind speed and the solar irradiance of the past decade per hour, and obtaining the relation between the capacity of the configured wind turbine generator and the capacity of the photovoltaic panel and the expected output power according to the average value of the wind speed and the solar irradiance;
Based on preset electrolytic tank capacity, photovoltaic cost, wind power cost and commercial power price, constraint conditions are applied to the configured capacity of the wind turbine generator and the capacity of the photovoltaic panel as variables, and optimal solutions of the configured capacity of the wind turbine generator and the capacity of the photovoltaic panel are solved with the minimum hydrogen production cost as a target, so that the configured optimal capacities of the photovoltaic panel and the wind turbine generator are obtained;
the constraint condition comprises that the total annual hydrogen production amount is not smaller than the target hydrogen production amount designated by a user, the sum of the output power of the photovoltaic panel and the wind turbine generator set at any moment is not larger than the upper limit of the operable power of the electrolytic cell, and the annual power grid electricity taking amount is not larger than a preset electricity taking value.
4. The method for controlling hydrogen production by using new energy sources from grid connection as claimed in claim 1, wherein the adjusting the output voltage and current of the photovoltaic panel and the wind turbine generator through the DC/DC converter and the first AC/DC converter to make the voltage-current relationship input into the electrolytic tank conform to the IV characteristic curve of the electrolytic tank comprises:
controlling a front stage of the DC/DC converter to track the maximum power point of the photovoltaic panel by using a disturbance observation method;
the output voltage and current of the photovoltaic panel are regulated through the rear stage of the DC/DC converter, so that the voltage and current input into the electrolytic tank accord with the IV characteristic curve of the electrolytic tank;
Controlling a front stage of the first AC/DC converter to track the maximum power point of the wind turbine by using a preset fan tracking method; the preset fan tracking method comprises at least one of a power signal feedback method, an optimal torque method, a conductivity increment method and the disturbance observation method;
and adjusting the output voltage and current of the wind turbine generator set through the rear stage of the first AC/DC converter, so that the voltage and current input into the electrolytic tank accord with the IV characteristic curve of the electrolytic tank.
5. The method for controlling hydrogen production by using new energy sources from grid connection as claimed in claim 4, wherein the output voltage and current of the photovoltaic panel are adjusted by the back stage of the DC/DC converter, so that the voltage and current input into the electrolytic cell are in accordance with the IV characteristic curve of the electrolytic cell, specifically:
the back stage of the DC/DC converter adjusts the output voltage and current of the photovoltaic panel by adjusting the duty ratio so as to maintain the balance between the output and the input power of the DC/DC converter, and the voltage and current input into the electrolytic tank are enabled to accord with the IV characteristic curve of the electrolytic tank.
6. The method for controlling hydrogen production by using new energy sources from grid connection as claimed in claim 4, wherein the step of adjusting the output voltage and current of the wind turbine generator set through the rear stage of the first AC/DC converter to make the voltage and current input into the electrolytic tank conform to the IV characteristic curve of the electrolytic tank comprises the following steps:
And the rear stage of the first AC/DC converter adjusts the output voltage and current of the wind turbine generator by adjusting the duty ratio so as to maintain the balance between the output power and the input power of the first AC/DC converter, and the voltage and current input into the electrolytic tank are enabled to be in accordance with the IV characteristic curve of the electrolytic tank.
7. The method for controlling hydrogen production from new energy sources on grid as claimed in claim 4, wherein tracking the maximum power point of the photovoltaic panel through the DC/DC converter, tracking the maximum power point of the wind turbine through the first AC/DC converter, and outputting the maximum power point to the electrolytic tank at the voltage corresponding to the set minimum power, specifically:
controlling a front stage of the DC/DC converter to track the maximum power point of the photovoltaic panel by using the disturbance observation method;
adjusting the output voltage of the photovoltaic panel to be the corresponding voltage with the set minimum power through the rear stage of the DC/DC converter, and inputting the voltage to the electrolytic tank; the corresponding voltage with the set minimum power is obtained by testing the electrolytic tank;
controlling a front stage of the first AC/DC converter to track the maximum power point of the wind turbine by using a preset fan tracking method; the preset fan tracking method comprises at least one of a power signal feedback method, an optimal torque method, a conductivity increment method and the disturbance observation method;
And adjusting the output voltage of the wind turbine generator to be the corresponding voltage with the set minimum power through the rear stage of the first AC/DC converter, and inputting the output voltage to the electrolytic tank with the corresponding voltage with the set minimum power.
8. The utility model provides a and off-grid new forms of energy hydrogen manufacturing control system which characterized in that includes: the photovoltaic power generation system comprises a photovoltaic panel, a DC/DC converter, an electrolytic tank, a wind turbine generator, a first AC/DC converter, a second AC/DC converter, a power grid and a control module;
the photovoltaic panel is connected with the electrolytic tank through the DC/DC converter, the wind turbine generator is connected with the electrolytic tank through the first AC/DC converter, the electrolytic tank is connected with the power grid through the second AC/DC converter, and the control module is respectively connected with the photovoltaic panel, the DC/DC converter, the electrolytic tank, the wind turbine generator, the first AC/DC converter, the second AC/DC converter and the power grid;
the control module is used for executing the off-grid new energy hydrogen production control method according to any one of claims 1 to 7.
9. The off-grid new energy hydrogen production control system of claim 8, wherein the control module comprises: acquiring a power unit, a new energy power supply unit and a power grid participation power supply unit;
The power acquisition unit is used for acquiring the current output power of the photovoltaic panel and the wind turbine generator in real time, acquiring the current new energy output power, and judging whether the current new energy output power meets the minimum power working condition; the lowest power working condition is that the current new energy output power is enough to maintain the electrolytic tank to work under the set lowest power;
the new energy power supply unit is used for controlling the second AC/DC converter to be not operated if the current new energy output power meets the minimum power working condition, and regulating the output voltage and current of the photovoltaic panel and the wind turbine generator through the DC/DC converter and the first AC/DC converter to enable the voltage and current relationship input into the electrolytic tank to be in accordance with an IV characteristic curve of the electrolytic tank so as to control the electrolytic tank to couple the photovoltaic panel and the wind turbine generator to perform hydrogen production operation;
and the power grid participation power supply unit is used for tracking the maximum power point of the photovoltaic panel through the DC/DC converter if the current new energy output power does not meet the minimum power working condition, tracking the maximum power point of the wind turbine generator through the first AC/DC converter, outputting the maximum power point to the electrolytic tank by the corresponding voltage with the set minimum power, and adjusting the output current through the second AC/DC converter to enable the power of the power grid to be connected into the electrolytic tank so as to control the electrolytic tank to perform hydrogen production working under the set minimum power based on the set minimum power, the maximum power point of the photovoltaic panel and the maximum power point of the wind turbine generator.
10. The off-grid new energy hydrogen production control system of claim 8, wherein the control module further comprises: a capacity allocation unit;
the capacity configuration unit is used for carrying out data analysis on local historical meteorological data, configuring the optimal capacities of the photovoltaic panel and the wind turbine generator so that the sum of the maximum output power of the photovoltaic panel and the maximum output power of the wind turbine generator is lower than the maximum load allowed by the electrolytic cell, and optimizing new energy power available for the operation of the electrolytic cell in one day; wherein the local historical meteorological data comprises wind speed data and solar irradiance data.
CN202311536726.2A 2023-11-17 2023-11-17 Control method and system for hydrogen production by using new energy sources in off-grid mode Pending CN117614000A (en)

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