CN114142499A - System and method for producing hydrogen by using new energy - Google Patents

System and method for producing hydrogen by using new energy Download PDF

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Publication number
CN114142499A
CN114142499A CN202111487738.1A CN202111487738A CN114142499A CN 114142499 A CN114142499 A CN 114142499A CN 202111487738 A CN202111487738 A CN 202111487738A CN 114142499 A CN114142499 A CN 114142499A
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energy storage
storage system
hydrogen production
reference value
new energy
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CN202111487738.1A
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Inventor
柏杨
李江松
李晓光
陈梦婷
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Sunshine Hydrogen Energy Technology Co Ltd
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Sungrow Power Supply Co Ltd
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Priority to CN202111487738.1A priority Critical patent/CN114142499A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • 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
    • H02J15/00—Systems for storing electric energy
    • H02J15/008—Systems for storing electric energy using hydrogen as energy vector
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
    • 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
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The application discloses a system and a control method for hydrogen production by new energy, which comprises the following steps: the system comprises a controller, a new energy system hydrogen production system and an energy storage system; the new energy system outputs new energy electric energy; the energy storage system stores the new energy electric energy and provides the stored electric energy for the hydrogen production system; the hydrogen production system is used for producing hydrogen by using new energy electric energy or electric energy of the energy storage system; the controller is used for determining the minimum capacity configuration of the energy storage system according to the response time of the hydrogen production system and the power fluctuation of the new energy system in the response time; obtaining the rated capacity of the energy storage system according to the minimum capacity configuration, and obtaining the rated power of the energy storage system according to power fluctuation; the rated capacity is greater than or equal to the minimum capacity configuration, and the rated power is greater than or equal to the power fluctuation. According to the scheme, the rated capacity and the rated power of the energy storage system are determined according to the response time of the hydrogen production system and the power fluctuation of the new energy system, the power fluctuation can be balanced, and the energy storage system with large capacity does not need to be arranged.

Description

System and method for producing hydrogen by using new energy
Technical Field
The application relates to the technical field of new energy, in particular to a system and a method for producing hydrogen by using new energy.
Background
At present, hydrogen is widely applied in various industries, and water electrolysis hydrogen production is an efficient, mature and clean hydrogen production mode, but the hydrogen production cost is higher. In areas with abundant renewable energy sources such as wind power, photoelectricity and the like, the phenomena of wind abandonment and light abandonment in the renewable energy power generation are serious. If the hydrogen is produced by water electrolysis by utilizing the residual resources, the problem of renewable energy consumption can be solved, and the electricity consumption cost of hydrogen production by water electrolysis can be reduced.
However, the new energy power generation has unstable characteristics, and when the new energy is directly connected to the electrolytic cell as a power supply, the input fluctuating current and voltage cause the random drift of the working point of the electrolytic cell, thereby affecting the internal mass transfer of the electrolytic cell, and affecting the hydrogen production, the service life and the efficiency of the electrolytic cell, and the like.
Disclosure of Invention
In order to solve the technical problems, the application provides a system and a method for producing hydrogen by using new energy, which can effectively utilize the new energy to produce hydrogen by water electrolysis and avoid the influence of the power fluctuation of the new energy on an electrolytic cell.
In order to achieve the above purpose, the technical solutions provided in the embodiments of the present application are as follows:
the application provides a system for hydrogen production from new energy, including: the system comprises a controller, a new energy system hydrogen production system and an energy storage system;
the new energy system is used for outputting new energy electric energy;
the energy storage system is used for storing the new energy electric energy and providing the stored electric energy to the hydrogen production system;
the hydrogen production system is used for producing hydrogen by using new energy electric energy or electric energy of the energy storage system;
the controller is used for determining the minimum capacity configuration of the energy storage system according to the response time of the hydrogen production system and the power fluctuation of the new energy system in the response time; obtaining rated capacity of the energy storage system according to the minimum capacity configuration, and obtaining rated power of the energy storage system according to the power fluctuation; the rated capacity is greater than or equal to the minimum capacity configuration, and the rated power is greater than or equal to the power fluctuation.
Preferably, the controller is specifically configured to configure a product of the response time and the power fluctuation as a minimum capacity of the energy storage system.
Preferably, the energy storage system or the controller is further configured to obtain a bus voltage reference value according to a maximum power point of the new energy system, and control an output voltage of the energy storage system according to the bus voltage reference value;
the controller is also used for controlling the input power of the hydrogen production system until the electric quantity of the energy storage system is in a preset proportion, so that the energy storage system absorbs the power fluctuation of the new energy system.
Preferably, the energy storage system or the controller is further configured to obtain a bus voltage reference value according to a maximum power point of the new energy system, and control an output voltage of the energy storage system according to the bus voltage reference value;
the hydrogen production system is also used for controlling the input voltage of the hydrogen production system according to the bus voltage reference value and obtaining a first target value of a current loop reference value according to the bus voltage loop; the power control device is also used for obtaining a second target value of a current loop reference value according to the preset proportion electric quantity of the energy storage system and the actual electric quantity of the energy storage system, obtaining a current reference value of the hydrogen production system according to the first target value of the current loop reference value and the second target value of the current loop reference value, and controlling the input power of the hydrogen production system according to the current reference value.
Preferably, the energy storage system or the controller is further configured to obtain a bus voltage reference value according to a maximum power point of the new energy system, and control an output voltage of the energy storage system according to the bus voltage reference value;
the controller is further used for controlling the input voltage of the hydrogen production system according to the bus voltage reference value and obtaining a first target value of a current loop reference value according to the bus voltage loop; the power control device is also used for obtaining a second target value of a current loop reference value according to the preset proportion electric quantity of the energy storage system and the actual electric quantity of the energy storage system, obtaining a current reference value of the hydrogen production system according to the first target value of the current loop reference value and the second target value of the current loop reference value, and controlling the input power of the hydrogen production system according to the current reference value.
The application also provides a control method of the new energy hydrogen production system, which is applied to the new energy hydrogen production system; the new energy hydrogen production system comprises: a new energy system, a hydrogen production system and an energy storage system;
the control method comprises the following steps:
determining the minimum capacity configuration of the energy storage system according to the response time of the hydrogen production system and the power fluctuation of the new energy system in the response time;
obtaining rated capacity of the energy storage system according to the minimum capacity configuration, and obtaining rated power of the energy storage system according to the power fluctuation; the rated capacity is greater than or equal to the minimum capacity configuration, and the rated power is greater than or equal to the power fluctuation.
Preferably, the determining the minimum capacity configuration of the energy storage system according to the response time of the hydrogen production system and the power fluctuation of the new energy system in the response time specifically includes:
and taking the product of the response time of the hydrogen production system and the power fluctuation of the new energy system in the response time as the minimum capacity configuration of the energy storage system.
Preferably, the method further comprises the following steps: obtaining a bus voltage reference value according to the maximum power point of the new energy system, and controlling the output voltage of the energy storage system according to the bus voltage reference value;
and controlling the input power of the hydrogen production system until the electric quantity of the energy storage system is in a preset proportion, so that the energy storage system absorbs the power fluctuation of the new energy system.
Preferably, the method further comprises the following steps:
obtaining a bus voltage reference value according to the maximum power point of the new energy system, and controlling the output voltage of the energy storage system according to the bus voltage reference value;
controlling the input voltage of the hydrogen production system according to the bus voltage reference value, and obtaining a first target value of a current loop reference value according to the bus voltage loop;
obtaining a second target value of the reference value of the current loop according to the preset proportion electric quantity of the energy storage system and the actual electric quantity of the energy storage system;
and obtaining a current reference value of the hydrogen production system according to the first target value of the current loop reference value and the second target value of the current loop reference value, and controlling the input power of the hydrogen production system according to the current reference value.
Preferably, the preset proportion of the electric quantity of the energy storage system is in a proportion range of 40% -60%.
According to the technical scheme, the method has the following beneficial effects:
according to the system for producing hydrogen by using new energy, in order to enable the new energy system to provide stable energy for the hydrogen production system, the energy storage system is arranged to balance power fluctuation generated by the new energy system, and the energy storage system can work in a charging mode to absorb redundant power generated by the new energy system; the energy storage system can work in a discharge mode to make up for the insufficient power provided by the new energy system to support the operation of the hydrogen production system. According to the embodiment, the rated capacity and the rated power of the energy storage system can be determined according to the response time of the hydrogen production system and the power fluctuation of the new energy system, so that the proper energy storage system is set, the requirements of the new energy hydrogen production system can be met, and the energy storage system with overlarge capacity does not need to be set, so that the resource waste is caused.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a system for producing hydrogen from a new energy source provided by an embodiment of the present application;
FIG. 2 is a flow chart of a control method of a new energy hydrogen production system provided by an embodiment of the application;
FIG. 3 is a flow chart of another control method for a new energy hydrogen production system provided by an embodiment of the application;
fig. 4 is a flowchart of a control method of another new energy hydrogen production system according to an embodiment of the present disclosure.
Detailed Description
In order to help better understand the scheme provided by the embodiment of the present application, before introducing the method provided by the embodiment of the present application, an application scenario of the scheme provided by the embodiment of the present application is introduced.
System embodiment
Referring to fig. 1, the figure is a schematic diagram of a system for producing hydrogen from a new energy source according to an embodiment of the present application.
The system for producing hydrogen from new energy provided by this embodiment includes not only the new energy system 100 and the hydrogen production system 300, but also the energy storage system 200, and the energy storage system 200 is added in this embodiment to smooth the power fluctuation of the new energy system 100 and absorb the transient fluctuation generated by the new energy system 100. The embodiment of the present application can solve the fluctuation generated by the new energy system 100 by using the energy storage system 200 with low power and capacity.
The hydrogen production is performed by using the electric energy provided by the new energy system 100, so that the electric energy of the new energy can be effectively used, but the new energy system 100 sometimes has power fluctuation, for example, when the new energy system 100 is a photovoltaic system, the power generated by the new energy system 100 may be different according to different illumination. However, hydrogen production system 300 requires a stable power supply when operating properly. The larger power change of the new energy system can cause the diaphragm between the small chambers in the electrolytic cell of the hydrogen production system to receive larger stress, and the service life and the efficiency of the electrolytic cell are influenced. Secondly, the control of the electrolytic cell mainly comprises temperature control, liquid level control and pressure control, and rapid power change can cause instability of parameters such as temperature, liquid level and pressure, and even possibly cause system failure to influence the yield of hydrogen. Under the above circumstances, a method of increasing the power change slope is generally adopted, that is, the rising slope or the falling slope of the power change is controlled, but the period of the power change may be 10s-1min, while the power change of the new energy system is random and rapid, and multiple changes may be completed within 1s, so that the generated power of the new energy system is not matched with the consumed power of the electrolytic cell, and the working efficiency of the system is reduced without the influence of other factors.
Therefore, in the system provided by the embodiment of the present application, in order to provide a stable power supply for hydrogen production system 300, energy storage system 200 is added, and energy storage system 200 is utilized to absorb power fluctuation generated by new energy system 100, wherein energy storage system 200 may operate in a discharging mode or a charging mode. When the output power of the new energy system 100 is reduced, the energy storage system 200 may operate in a discharging mode, thereby compensating for the reduced power of the new energy system 100; when the output power of the new energy system 100 is increased, the energy storage system 200 can work in a charging mode to absorb the increased power of the new energy system 100.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the drawings are described in detail below.
The system for producing hydrogen from new energy provided in this embodiment includes, in addition to the new energy system 100, the hydrogen production system 300, and the energy storage system 200, further includes: a controller (not shown).
And the new energy system 100 is used for outputting new energy electric energy.
The energy storage system 200 is used for storing the new energy electric energy and providing the stored electric energy to the hydrogen production system 300;
and the hydrogen production system 300 is used for producing hydrogen by using new energy electric energy or electric energy of the energy storage system.
A controller (not shown) for determining a minimum capacity configuration of energy storage system 200 based on a response time of hydrogen production system 300 and a power fluctuation of new energy system 100 during the response time; obtaining the rated capacity of the energy storage system 200 according to the minimum capacity configuration, and obtaining the rated power of the energy storage system 200 according to power fluctuation; the rated capacity is greater than or equal to the minimum capacity configuration, and the rated power is greater than or equal to the power fluctuation.
In order to leave a certain margin, the rated capacity of the energy storage system 200 needs to be configured to be equal to or greater than the minimum capacity configuration, for example, a proportionality coefficient may be preset, the proportionality coefficient is multiplied by the minimum capacity configuration to be used as the rated capacity, the proportionality coefficient is greater than 1, and for example, the proportionality coefficient may be 1.5 or 1.8. Similarly, the relationship between the rated power and the power fluctuation may also be set according to a preset coefficient, and it should be understood that the preset coefficient is greater than 1, for example, 1.5 may also be adopted, that is, the rated power is 1.5 times of the power fluctuation. The above values are only examples, and those skilled in the art can set them according to the requirements of the actual system.
The response time of hydrogen production system 300 refers to a response parameter of hydrogen production system 300, such as the time from when the controller sends a preset instruction to hydrogen production system 300 to when hydrogen production system 300 actually executes the preset instruction. The specific content and form of the preset instruction are not limited in the present application, and for example, the preset instruction may be any one of the following: voltage, current, or power. Response time refers to the time difference between the time that hydrogen production system 300 receives the preset command and the time that the preset command is executed.
Response time of hydrogen production system 300 is generally fixed after each parameter of hydrogen production system 300 is fixed, and the response time is a known quantity for hydrogen production system 300.
The controller is specifically configured to use a product of the response time and the power fluctuation as a minimum capacity configuration of the energy storage system, that is, the power fluctuation of the energy storage system in a period of the response time needs to be determined. The power fluctuation may be obtained by big data analysis of the generated power of the new energy system 100, or may be obtained from an empirical value.
In general, the power fluctuation may take the maximum value of the power fluctuation of the new energy system 100. When the new energy system 100 is a photovoltaic system, power fluctuation is related to both illumination and temperature.
In the system for producing hydrogen by using new energy provided by the embodiment of the application, in order to enable the new energy system to provide stable energy for the hydrogen production system, the energy storage system is arranged to balance power fluctuation generated by the new energy system, and the energy storage system can work in a charging mode to absorb redundant power generated by the new energy system; the energy storage system can work in a discharge mode to make up for the insufficient power provided by the new energy system to support the operation of the hydrogen production system. According to the embodiment, the rated capacity and the rated power of the energy storage system can be determined according to the response time of the hydrogen production system and the power fluctuation of the new energy system, so that the proper energy storage system is set, the requirements of the new energy hydrogen production system can be met, and the energy storage system with overlarge capacity does not need to be set, so that the resource waste is caused.
According to the control method provided by the embodiment, the parameters of the energy storage system needing to be configured can be determined according to the new energy system and the hydrogen production system, the influence of the power fluctuation of the new energy system on the hydrogen production system can be reduced only by configuring the energy storage system with small power and small capacity, the bus voltage reference value can be obtained by the maximum power point of the new energy system, and the power generation of the new energy system can be optimized; and the overall cost of the configured energy storage system with smaller capacity is smaller than that of the whole system for producing hydrogen by using new energy, so that the system cost is reduced as much as possible on the premise of effectively utilizing the electric energy of the new energy.
The system provided by the application not only can be used for configuring a proper energy storage system for a new energy hydrogen production system, but also can be used for controlling the bus voltage of the system, and a specific implementation mode is introduced below. When the real-time power of the new energy system changes, the fluctuation of the bus voltage is shown to fluctuate along with the fluctuation of the real-time power before the energy storage system and the hydrogen production system do not respond, so that the bus voltage can be controlled to enable the system to tend to be stable. The mode of regulating the bus voltage comprises two modes, wherein the first mode is a master-slave mode, namely the energy storage system controls the bus voltage, and the hydrogen production system controls the input power. The second is a competitive mode, i.e., the energy storage system controls the bus voltage, the hydrogen production system also controls the bus voltage at the same time, but the energy storage system is required to absorb the high-frequency fluctuation on the bus, and the hydrogen production system absorbs the low-frequency fluctuation on the bus.
The first method comprises the following steps: master-slave mode.
The energy storage system or the controller is also used for obtaining a bus voltage reference value according to the maximum power point of the new energy system and controlling the output voltage of the energy storage system according to the bus voltage reference value; namely, the energy storage system adjusts the output voltage of the energy storage system to be consistent with the bus voltage reference value according to the bus voltage reference value. The energy storage system can work in a charging mode and can work in a discharging mode when controlling the bus voltage.
And the controller is also used for controlling the input power of the hydrogen production system until the electric quantity of the energy storage system is in a preset proportion, so that the energy storage system absorbs the power fluctuation of the new energy system.
The preset proportion electric quantity is not specifically limited in the application, for example, the preset proportion electric quantity can be 50% of the total electric quantity of the energy storage system, and other preset proportion electric quantities can also be set, but the preset proportion electric quantity is smaller than the total electric quantity of the energy storage system, so that the energy storage system is provided with a margin, the energy storage system can be discharged and charged, and the power fluctuation of the new energy system is balanced. For example, the proportional range of the preset proportional amount of electricity may set 40% -60% of the total amount of electricity.
It should be appreciated that the energy storage system performs bus voltage control as a cyclic process, and the output voltage is typically controlled to the bus voltage reference without a control period. Similarly, the input power of the hydrogen production system also needs to be circulated for a plurality of cycles, so that the electric quantity of the energy storage system can reach the preset proportion electric quantity.
A second way of controlling the bus voltage provided by the present application is described below.
And the second method comprises the following steps: a contention mode.
The energy storage system or the controller is also used for obtaining a bus voltage reference value according to the maximum power point of the new energy system and controlling the output voltage of the energy storage system according to the bus voltage reference value; it should be understood that obtaining the reference value of the bus voltage from the maximum power point of the new energy system is a mature technology and will not be described herein. For example, when the new energy system is a photovoltaic system, the bus voltage reference value can be obtained according to the maximum power point of the photovoltaic system.
The hydrogen production system is also used for controlling the input voltage of the hydrogen production system according to the bus voltage reference value and obtaining a first target value of the current loop reference value according to the bus voltage loop; the power control device is also used for obtaining a second target value of the current loop reference value according to the preset proportion electric quantity of the energy storage system and the actual electric quantity of the energy storage system, obtaining a current reference value of the hydrogen production system according to the first target value of the current loop reference value and the second target value of the current loop reference value, and controlling the input power of the hydrogen production system according to the current reference value. It should be understood that the input power is equal to the input voltage multiplied by the input current of the hydrogen production system, the input voltage of the hydrogen production system is the bus voltage, and the input current of the hydrogen production system can be controlled according to the current reference value, so that the input power of the hydrogen production system can be controlled by controlling the input current of the hydrogen production system on the premise that the bus voltage is controlled.
In this embodiment, the hydrogen production system also needs to control the bus voltage, and therefore, a current reference value can be obtained according to the bus voltage, that is, the hydrogen production system includes two control loops, a voltage loop and a current loop. The hydrogen production system obtains a first target value according to the bus voltage loop, obtains a second target value according to the preset proportion electric quantity and the actual electric quantity of the energy storage system, and obtains a final current reference value according to the first target value and the second target value.
It should be understood that the first target value and the second target value may be added together to obtain the current reference value, and it is also understood that the current reference value may be obtained by subtracting the second target value from the first target value, mainly considering whether the second target value is positive or negative, for example, the first target value is 50%, the second target value is 40%, and the difference between the two is 50% -40%, which is 10%. When the power of the hydrogen production system needs to be increased, the current reference value is increased, and then the energy storage system discharges.
From the current loop reference I of the hydrogen production systemH_refdesAnd from current loop step size I of the hydrogen production system_stepAnd calculating to obtain a real-time current loop reference value I of the hydrogen production systemH_ref(ii) a Step length I of current loop_stepCan be adjusted as required, i.e. the current cannot be changed too quicklyGradually increasing or decreasing is required. For example, if the real-time current loop reference value IH_refGreater than the current loop reference value IH_refdesThen real-time current loop reference value IH_ref＝IH_ref-I_step(ii) a If the real-time current loop reference value IH_refLess than the current loop reference value IH_refdesThen real-time current loop reference value IH_ref；＝IH_ref+I_step。
It should be understood that when the hydrogen production system adjusts the system power according to the current reference value, the power variation of the hydrogen production system can be controlled according to the current reference value and the actual current value of the hydrogen production system, for example, the power of the hydrogen production system is controlled to rise or fall according to a fixed slope.
Because the input power of the hydrogen production system provided by the embodiment of the application is increased or reduced according to the fixed slope, the power fluctuation of the hydrogen production system is relatively fixed, and the hydrogen production system can absorb the low-frequency fluctuation on the bus. Because the power of the energy storage system is the power of the new energy system, namely the power of the hydrogen production system, the energy storage system is used for absorbing high-frequency fluctuation on the bus.
It should be noted that, in the second mode described above, the input power of the hydrogen production system is controlled by the hydrogen production system, where various parameters required by the hydrogen production system may be sent to the hydrogen production system by the energy storage system, that is, the hydrogen production system and the energy storage system may communicate with each other.
In addition, the input power of the hydrogen production system can also be controlled by a controller, wherein the controller can be a controller independent of the hydrogen production system, for example, the controller can be a controller of an energy storage system, a controller of a new energy system, or a controller independent of the new energy system, the hydrogen production system and the energy storage system, namely, the controller is realized by an upper computer. In addition, in addition to the controller controlling the input power of the hydrogen production system, the controller may also be controlled by the energy storage system, and the process of controlling the input power of the hydrogen production system by the controller or the energy storage system is described below.
The energy storage system or the controller is also used for obtaining a bus voltage reference value according to the maximum power point of the new energy system and controlling the output voltage of the energy storage system according to the bus voltage reference value;
the controller is also used for controlling the input voltage of the hydrogen production system according to the bus voltage reference value and obtaining a first target value of the current loop reference value according to the bus voltage loop; the power control device is also used for obtaining a second target value of the current loop reference value according to the preset proportion electric quantity of the energy storage system and the actual electric quantity of the energy storage system, obtaining a current reference value of the hydrogen production system according to the first target value of the current loop reference value and the second target value of the current loop reference value, and controlling the input power of the hydrogen production system according to the current reference value.
Method embodiment
Based on the system for producing hydrogen from new energy provided by the above embodiment, the embodiment of the application also provides a control method of the system for producing hydrogen from new energy, which is described in detail below with reference to the accompanying drawings.
Referring to fig. 2, the figure is a flowchart of a control method of a new energy hydrogen production system provided by an embodiment of the present application.
The control method of the new energy hydrogen production system provided by the embodiment is applied to the new energy hydrogen production system; the new energy hydrogen production system comprises: a new energy system, a hydrogen production system and an energy storage system;
the control method comprises the following steps:
s201: determining the minimum capacity configuration of the energy storage system according to the response time of the hydrogen production system and the power fluctuation of the new energy system in the response time;
the method comprises the following steps of determining the minimum capacity configuration of an energy storage system according to the response time of a hydrogen production system and the power fluctuation of a new energy system in the response time, and specifically comprises the following steps:
and taking the product of the response time of the hydrogen production system and the power fluctuation of the new energy system in the response time as the minimum capacity configuration of the energy storage system.
S202: obtaining the rated capacity of the energy storage system according to the minimum capacity configuration, and obtaining the rated power of the energy storage system according to power fluctuation; the rated capacity is greater than or equal to the minimum capacity configuration, and the rated power is greater than or equal to the power fluctuation.
Therefore, in the control method provided by the embodiment of the application, in order to provide a stable power supply for the hydrogen production system, an energy storage system is added, and the energy storage system is used for absorbing power fluctuation generated by a new energy system, wherein the energy storage system can work in a discharge mode and can also work in a charge mode. When the output power of the new energy system is reduced, the energy storage system can work in a discharging mode, so that the reduced power of the new energy system is made up; when the output power of the new energy system is increased, the energy storage system can work in a charging mode so as to absorb the increased power of the new energy system.
The control method provided by the application not only can be used for configuring a proper energy storage system for a new energy hydrogen production system, but also can be used for controlling the bus voltage of the system, and a specific implementation mode is introduced below. When the real-time power of the new energy system changes, the fluctuation of the bus voltage is shown to fluctuate along with the fluctuation of the real-time power before the energy storage system and the hydrogen production system do not respond, so that the bus voltage can be controlled to enable the system to tend to be stable. The mode of regulating the bus voltage comprises two modes, wherein the first mode is a master-slave mode, namely the energy storage system controls the bus voltage, and the hydrogen production system controls the input power. The second is a competitive mode, i.e., the energy storage system controls the bus voltage, the hydrogen production system also controls the bus voltage at the same time, but the energy storage system is required to absorb the high-frequency fluctuation on the bus, and the hydrogen production system absorbs the low-frequency fluctuation on the bus.
The first control mode will be described.
Referring to fig. 3, a flow chart of another control method for a new energy hydrogen production system provided by the present application is shown.
This embodiment mainly describes an implementation manner in which the bus voltage is controlled by the energy storage system.
The control method provided by the embodiment comprises the following steps:
s301: and obtaining a bus voltage reference value according to the maximum power point of the new energy system.
S302: and controlling the output voltage of the energy storage system according to the bus voltage reference value.
S303: and controlling the hydrogen production input power of the hydrogen production system until the electric quantity of the energy storage system is in a preset proportion, so that the energy storage system absorbs the power fluctuation of the new energy system.
The specific value of the preset proportion electric quantity is not specifically limited in the embodiment of the application, for example, the preset proportion may be 50% or 60%, and the proportion range of the preset proportion electric quantity of the energy storage system is 40% -60%, so that the energy storage system has enough capacity to absorb power and release power, thereby balancing the power fluctuation generated by the new energy system.
The second control mode is described below.
Referring to fig. 4, a flow chart of a control method of another new energy hydrogen production system provided by the present application is shown.
The control method provided by the embodiment comprises the following steps:
s401: and obtaining a bus voltage reference value according to the maximum power point of the new energy system, and controlling the output voltage of the energy storage system according to the bus voltage reference value. At this time, the energy storage system can work in a charging mode and can also work in a discharging mode.
S402: and controlling the input voltage of the hydrogen production system according to the bus voltage reference value, and obtaining a first target value of the current loop reference value according to the bus voltage loop.
In this embodiment, the hydrogen production system also needs to control the bus voltage, and therefore, a current reference value can be obtained according to the bus voltage, that is, the hydrogen production system includes two control loops, a voltage loop and a current loop. The hydrogen production system obtains a first target value according to the bus voltage loop, obtains a second target value according to the preset proportion electric quantity and the actual electric quantity of the energy storage system, and obtains a final current reference value according to the first target value and the second target value.
S403: and obtaining a second target value of the reference value of the current loop according to the preset proportion electric quantity of the energy storage system and the actual electric quantity of the energy storage system. For example, the preset percentage of the electric quantity may be 50%.
S404: obtaining a current reference value of the hydrogen production system according to the first target value of the current loop reference value and the second target value of the current loop reference value; and controlling the hydrogen production input power of the hydrogen production system according to the current reference value.
From the current loop reference I of the hydrogen production systemH_refdesAnd from current loop step size I of the hydrogen production system_stepAnd calculating to obtain a real-time current loop reference value I of the hydrogen production systemH_ref(ii) a Step length I of current loop_stepIt can be adjusted as desired, i.e. the current change must not be too fast, and needs to be gradually increased or decreased. For example, if the real-time current loop reference value IH_refGreater than the current loop reference value IH_refdesThen real-time current loop reference value IH_ref＝IH_ref-I_step(ii) a If the real-time current loop reference value IH_refLess than the current loop reference value IH_refdesThen real-time current loop reference value IH_ref；＝IH_ref+I_step(ii) a Namely, the current becomes larger and smaller, and the current becomes smaller and larger.
It should be understood that the first target value and the second target value may be added together to obtain the current reference value, and it is also understood that the current reference value may be obtained by subtracting the second target value from the first target value, mainly considering whether the second target value is positive or negative, for example, the first target value is 50%, the second target value is 40%, and the difference between the two is 50% -40%, which is 10%. When the power of the hydrogen production system needs to be increased, the current reference value is increased, and then the energy storage system discharges.
It should be understood that when the hydrogen production system adjusts the system power according to the current reference value, the power variation of the hydrogen production system can be controlled according to the current reference value and the actual current value of the hydrogen production system, for example, the power of the hydrogen production system is controlled to rise or fall according to a fixed slope.
Because the input power of the hydrogen production system provided by the embodiment of the application is increased or reduced according to the fixed slope, the power fluctuation of the hydrogen production system is relatively fixed, and the hydrogen production system can absorb the low-frequency fluctuation on the bus. Because the power of the energy storage system is the power of the new energy system, namely the power of the hydrogen production system, the energy storage system is used for absorbing high-frequency fluctuation on the bus.
It should be noted that, in the second mode described above, the input power of the hydrogen production system is controlled by the hydrogen production system, where various parameters required by the hydrogen production system may be sent to the hydrogen production system by the energy storage system, that is, the hydrogen production system and the energy storage system may communicate with each other.
According to the control method provided by the embodiment, the parameters of the energy storage system needing to be configured can be determined according to the new energy system and the hydrogen production system, the influence of the power fluctuation of the new energy system on the hydrogen production system can be reduced only by configuring the energy storage system with small power and small capacity, the bus voltage reference value can be obtained by the maximum power point of the new energy system, and the power generation of the new energy system can be optimized; and the overall cost of the configured energy storage system with smaller capacity is smaller than that of the whole system for producing hydrogen by using new energy, so that the system cost is reduced as much as possible on the premise of effectively utilizing the electric energy of the new energy.
As can be seen from the above description of the embodiments, those skilled in the art can clearly understand that all or part of the steps in the above embodiment methods can be implemented by software plus a necessary general hardware platform. Based on such understanding, the technical solution of the present application may be essentially or partially implemented in the form of a software product, which may be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network communication device such as a media gateway, etc.) to execute the method according to the embodiments or some parts of the embodiments of the present application.
It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. The method disclosed by the embodiment corresponds to the system disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the system part for description.
It should also be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing description of the disclosed embodiments will enable those skilled in the art to make or use the invention in various modifications to these embodiments, which will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A system for producing hydrogen from new energy, which is characterized by comprising: the system comprises a controller, a new energy system hydrogen production system and an energy storage system;
the new energy system is used for outputting new energy electric energy;
the energy storage system is used for storing the new energy electric energy and providing the stored electric energy to the hydrogen production system;
the hydrogen production system is used for producing hydrogen by using new energy electric energy or electric energy of the energy storage system;
the controller is used for determining the minimum capacity configuration of the energy storage system according to the response time of the hydrogen production system and the power fluctuation of the new energy system in the response time; obtaining rated capacity of the energy storage system according to the minimum capacity configuration, and obtaining rated power of the energy storage system according to the power fluctuation; the rated capacity is greater than or equal to the minimum capacity configuration, and the rated power is greater than or equal to the power fluctuation.
2. The system according to claim 1, wherein the controller is configured, in particular, to configure a product of the response time and the power fluctuation as a minimum capacity of the energy storage system.
3. The system according to claim 1 or 2, wherein the energy storage system or the controller is further configured to obtain a bus voltage reference value according to a maximum power point of the new energy system, and control an output voltage of the energy storage system according to the bus voltage reference value;
the controller is also used for controlling the input power of the hydrogen production system until the electric quantity of the energy storage system is in a preset proportion, so that the energy storage system absorbs the power fluctuation of the new energy system.
4. The system according to claim 1 or 2, wherein the energy storage system or the controller is further configured to obtain a bus voltage reference value according to a maximum power point of the new energy system, and control an output voltage of the energy storage system according to the bus voltage reference value;
the hydrogen production system is also used for controlling the input voltage of the hydrogen production system according to the bus voltage reference value and obtaining a first target value of a current loop reference value according to the bus voltage loop; the power control device is also used for obtaining a second target value of a current loop reference value according to the preset proportion electric quantity of the energy storage system and the actual electric quantity of the energy storage system, obtaining a current reference value of the hydrogen production system according to the first target value of the current loop reference value and the second target value of the current loop reference value, and controlling the input power of the hydrogen production system according to the current reference value.
5. The system of claim 1, wherein the energy storage system or the controller is further configured to obtain a bus voltage reference according to a maximum power point of the new energy system, and control an output voltage of the energy storage system according to the bus voltage reference;
the controller is further used for controlling the input voltage of the hydrogen production system according to the bus voltage reference value and obtaining a first target value of a current loop reference value according to the bus voltage loop; the power control device is also used for obtaining a second target value of a current loop reference value according to the preset proportion electric quantity of the energy storage system and the actual electric quantity of the energy storage system, obtaining a current reference value of the hydrogen production system according to the first target value of the current loop reference value and the second target value of the current loop reference value, and controlling the input power of the hydrogen production system according to the current reference value.
6. A control method of a new energy hydrogen production system is characterized by being applied to the new energy hydrogen production system; the new energy hydrogen production system comprises: a new energy system, a hydrogen production system and an energy storage system;
the control method comprises the following steps:
determining the minimum capacity configuration of the energy storage system according to the response time of the hydrogen production system and the power fluctuation of the new energy system in the response time;
obtaining rated capacity of the energy storage system according to the minimum capacity configuration, and obtaining rated power of the energy storage system according to the power fluctuation; the rated capacity is greater than or equal to the minimum capacity configuration, and the rated power is greater than or equal to the power fluctuation.
7. The method according to claim 6, wherein determining the minimum capacity configuration of the energy storage system based on the response time of the hydrogen production system and the power fluctuation of the new energy system during the response time comprises:
and taking the product of the response time of the hydrogen production system and the power fluctuation of the new energy system in the response time as the minimum capacity configuration of the energy storage system.
8. The method of claim 6 or 7, further comprising: obtaining a bus voltage reference value according to the maximum power point of the new energy system, and controlling the output voltage of the energy storage system according to the bus voltage reference value;
and controlling the input power of the hydrogen production system until the electric quantity of the energy storage system is in a preset proportion, so that the energy storage system absorbs the power fluctuation of the new energy system.
9. The method of claim 6 or 7, further comprising:
obtaining a bus voltage reference value according to the maximum power point of the new energy system, and controlling the output voltage of the energy storage system according to the bus voltage reference value;
controlling the input voltage of the hydrogen production system according to the bus voltage reference value, and obtaining a first target value of a current loop reference value according to the bus voltage loop;
obtaining a second target value of the reference value of the current loop according to the preset proportion electric quantity of the energy storage system and the actual electric quantity of the energy storage system;
and obtaining a current reference value of the hydrogen production system according to the first target value of the current loop reference value and the second target value of the current loop reference value, and controlling the input power of the hydrogen production system according to the current reference value.
10. The method according to claim 8 or 9, wherein the preset proportion of the electric quantity of the energy storage system is in a proportion range of 40% -60%.
CN202111487738.1A 2021-12-07 2021-12-07 System and method for producing hydrogen by using new energy Pending CN114142499A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114938010A (en) * 2022-06-29 2022-08-23 中国计量大学现代科技学院 New energy hydrogen production control method and system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114938010A (en) * 2022-06-29 2022-08-23 中国计量大学现代科技学院 New energy hydrogen production control method and system

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