CN115579961A - Power supply load stability control method and system for hydrogen production and hydrogenation station - Google Patents

Power supply load stability control method and system for hydrogen production and hydrogenation station Download PDF

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Publication number
CN115579961A
CN115579961A CN202211576300.5A CN202211576300A CN115579961A CN 115579961 A CN115579961 A CN 115579961A CN 202211576300 A CN202211576300 A CN 202211576300A CN 115579961 A CN115579961 A CN 115579961A
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control switch
power supply
hydrogen production
hydrogen
control
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CN115579961B (en
Inventor
王宪民
明旭东
董武
孙维巍
胡纹溪
李忠恕
曹若涵
马金鹏
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Changchun Jidian Hydrogen Energy Co ltd
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Changchun Jidian Hydrogen Energy Co ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
    • C01B3/02—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen
    • C01B3/04—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by decomposition of inorganic compounds, e.g. ammonia
    • C01B3/042—Decomposition of water
    • 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
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
    • 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 relates to a method and a system for controlling the stability of a power supply load of a hydrogen production and hydrogenation station, and belongs to the field of hydrogen production. The power supply load stability control system of the hydrogen production and hydrogenation station comprises a photovoltaic power supply, a first conversion unit, an energy storage battery, a second conversion unit, a first control switch, a second control switch, a third control switch, a fourth control switch, a fifth control switch, a sixth control switch, an inversion module and a control module, wherein the control system is connected with the hydrogen production and hydrogenation station and a power grid. According to different ranges of hydrogen capacity values in the hydrogen storage units of the hydrogen production and hydrogenation station and different ranges of the power generation power of the photovoltaic power supply, the hydrogen capacity values in the hydrogen storage units of the hydrogen production and hydrogenation station are supplemented fastest, and the utilization efficiency of photovoltaic resources is improved.

Description

Power supply load stability control method and system for hydrogen production and hydrogenation station
Technical Field
The invention belongs to the field of hydrogen production, and particularly relates to a method and a system for controlling the stability of a power supply load of a hydrogen production and hydrogenation station.
Background
Currently, global fossil energy resources are increasingly in shortage, and environmental pressures such as climate change are increasing. Solar energy is used as a clean, safe and renewable green energy source, and has unique advantages in the aspects of relieving the shortage of world energy supply, optimizing the energy structure, protecting the environment and the like. The solar power generation does not need to consume conventional energy, is green and pollution-free clean energy and is valued by countries in the world. Photovoltaic power generation has been rapidly developed in recent years as a main form of utilization of solar power generation. Large-scale photovoltaic grid-connected power generation is an effective method for fully utilizing solar energy, is also the mainstream trend of photovoltaic power generation systems, and is applied to the current large-scale photovoltaic grid-connected systems.
Because the output of the photovoltaic grid connection is random, the photovoltaic grid connection system is an uncontrollable power supply relative to a large power grid, and the instability of the output of the photovoltaic grid connection system has influence on the safe and stable operation of the large power grid. Therefore, penetration access of large-scale photovoltaic power generation certainly brings a series of influences to a power grid, the photovoltaic power generation is an intermittent energy source and is influenced by solar radiation intensity, environmental temperature and the like, output power is uncertain, short-term load prediction accuracy of the large power grid is reduced after the photovoltaic power generation is incorporated into the power grid, voltage and frequency fluctuation of the whole system is inevitably caused by large-scale change of photovoltaic output, the power system has the problems of frequency and voltage stability, the difficulty of traditional power generation, control and operation plans is increased, and the conventional power supply and the coordinated scheduling of the conventional power supply are not facilitated for power grid scheduling personnel. And the instability of the output of the photovoltaic power generation hydrogen production will influence the stability of hydrogen production.
Disclosure of Invention
The invention aims to provide a method and a system for controlling the stability of a power supply load of a hydrogen production and hydrogenation station, which not only improve the rate of supplementing a hydrogen capacity value, but also improve the utilization efficiency of photovoltaic resources.
A power supply load stability control system of a hydrogen production and hydrogenation station comprises a photovoltaic power supply 1, a first conversion unit 2, an energy storage battery 3, a second conversion unit 4, a first control switch K1, a second control switch K2, a third control switch K3, a fourth control switch K4, a fifth control switch K5, a sixth control switch K6, an inverter module 5 and a control module 6, wherein the control system is connected with the hydrogen production and hydrogenation station 7 and a power grid 8;
the first ends of the first control switch K1 and the second control switch K2 are connected in parallel and then electrically connected with the photovoltaic power supply 1, the second end of the second control switch K2 is electrically connected with the input end of the first conversion unit 2, and the output end of the first conversion unit 2 is electrically connected with the energy storage battery 3; the first end of third control switch K3 with energy storage battery 3 electric connection, the second end of first control switch K1 with the second end of third control switch K3 parallelly connected back with the low pressure side electric connection of second converting unit 4, the high pressure side of second converting unit 4 with the input electric connection of contravariant module 5, the high pressure side of second converting unit 4 with the electric connection is equipped with unit formula capacitor module C between the input of contravariant module 5.
Optionally, the power supply load stability control system of the hydrogen production and hydrogenation station is a DCS integrated monitoring system.
A stability control method for a power supply load of a hydrogen production and hydrogenation station comprises a stability control system for the power supply load of the hydrogen production and hydrogenation station, wherein the stability control system for the power supply load of the hydrogen production and hydrogenation station comprises a photovoltaic power supply, a first conversion unit, an energy storage battery, a second conversion unit, a first control switch K1, a second control switch K2, a third control switch K3, a fourth control switch K4, a fifth control switch K5, a sixth control switch K6, an inversion module, a control module, the hydrogen production and hydrogenation station, a unit type capacitor module C and a power grid; the first ends of the first control switch K1 and the second control switch K2 are electrically connected with the photovoltaic power supply after being connected in parallel, the second end of the second control switch K2 is electrically connected with the input end of the first conversion unit, and the output end of the first conversion unit is electrically connected with the energy storage battery; the first end of the third control switch K3 is electrically connected with the energy storage battery, the second end of the first control switch K1 is electrically connected with the low-voltage side of the second conversion unit after being connected in parallel with the second end of the third control switch K3, the high-voltage side of the second conversion unit is electrically connected with the input end of the inversion module, and a unit capacitor module C is electrically connected between the high-voltage side of the second conversion unit and the input end of the inversion module; the first connecting end of the inversion module is electrically connected with one end of the fourth control switch K4, the second connecting end of the inversion module is electrically connected with one end of the fifth control switch K5, the other end of the fourth control switch K4 is electrically connected with a hydrogen production and hydrogenation station, the hydrogen production and hydrogenation station is connected with an electric automobile through a hydrogenation cabinet body, a hydrogen storage unit of the hydrogen production and hydrogenation station provides hydrogen for the electric automobile through the hydrogenation cabinet body, and the other end of the fifth control switch K5 is electrically connected with a power grid;
the hydrogen capacity value in the hydrogen storage unit of the hydrogen production and hydrogenation station accounts for 60-100% of the rated capacity percentage and is in a first interval, 40-60% of the rated capacity percentage is in a second interval, and 20-40% of the rated capacity percentage is in a third interval;
the range of 70-100% of the generated power of the photovoltaic power source in percentage of the rated power is a first range, the range of 40-70% is a second range, and the range of 0-40% is a third range;
comprises the following steps:
and controlling the photovoltaic power supply and the power grid to supply power to the hydrogen production and hydrogenation station by the control module according to different ranges of hydrogen capacity values in hydrogen storage units of the hydrogen production and hydrogenation station and different ranges of the power generation power of the photovoltaic power supply.
Optionally, the method comprises the following steps:
s1, when the hydrogen capacity value in the hydrogen storage unit of the hydrogen production and hydrogenation station is in a first interval,
when the generating power of the photovoltaic power supply is in a first range, if the generating power change rate of the photovoltaic power supply is smaller than 10%, the control module controls the first control switch K1, the fourth control switch K4 and the sixth control switch K6 to be closed, the second control switch K2, the third control switch K3 and the fifth control switch K5 to be disconnected, the photovoltaic power supply supplies power to the hydrogen production hydrogenation station through the first control switch K1, the second conversion unit and the fourth control switch K4 on one hand, and supplies power to the power grid through the sixth control switch K6 and the third conversion unit on the other hand.
Optionally, step S1 further includes the following steps:
when the generating power of the photovoltaic power supply is in a first range, if the generating power change rate of the photovoltaic power supply is smaller than 10%, the control module controls the first control switch K1, the fourth control switch K4 and the sixth control switch K6 to be closed, the second control switch K2, the third control switch K3 and the fifth control switch K5 to be disconnected, the photovoltaic power supply supplies power to the hydrogen production hydrogenation station through the first control switch K1, the second conversion unit and the fourth control switch K4 on one hand, and supplies power to the power grid through the sixth control switch K6 and the third conversion unit on the other hand.
Optionally, step S1 further includes the following steps:
when the generating power of the photovoltaic power supply is in a second range, the control module controls the first control switch K1 and the fourth control switch K4 to be closed, the second control switch K2, the third control switch K3, the fifth control switch K5 and the sixth control switch K6 to be disconnected, and the photovoltaic power supply supplies power to the hydrogen production and hydrogenation station through the first control switch K1, the second conversion unit and the fourth control switch K4.
Optionally, step S1 further includes the following steps:
when the generated power of the photovoltaic power supply is in a third range, the control module controls the first control switch K1, the second control switch K2, the third control switch K3 and the fourth control switch K4 to be closed, the fifth control switch K5 and the sixth control switch K6 to be disconnected, and the photovoltaic power supply supplies power to the hydrogen production and hydrogenation station through the first control switch K1, the second control switch K2, the first conversion unit, the energy storage battery, the third control switch K3, the second conversion unit and the fourth control switch K4.
Optionally, the method comprises the following steps:
s2, when the hydrogen capacity value in the hydrogen storage unit of the hydrogen production and hydrogenation station is in the second interval,
when the generating power of the photovoltaic power supply is located a first range, the control module controls the first control switch K1 and the fourth control switch K4 to be closed, the second control switch K2, the third control switch K3, the fifth control switch K5 and the sixth control switch K6 to be disconnected, and the photovoltaic power supply supplies power to the hydrogen production and hydrogenation station through the first control switch K1, the second conversion unit and the fourth control switch K4 to accelerate the hydrogen production of the hydrogen production and hydrogenation station.
Optionally, step S2 further includes the following steps:
when the generated power of the photovoltaic power supply is in the second range, the control module controls the first control switch K1, the second control switch K2, the third control switch K3 and the fourth control switch K4 to be closed, the fifth control switch K5 and the sixth control switch K6 to be disconnected, and the photovoltaic power supply supplies power to the hydrogen production and hydrogenation station through the first control switch K1, the second control switch K2, the first conversion unit, the energy storage battery, the third control switch K3, the second conversion unit and the fourth control switch K4.
Optionally, step S2 further includes the following steps:
when the generating power of the photovoltaic power supply is in a third range, the control module controls the fourth control switch K4, the fifth control switch K5 and the sixth control switch K6 to be closed, the first control switch K1, the second control switch K2 and the third control switch K3 to be disconnected, the photovoltaic power supply supplies power to the power grid through the sixth control switch K6 and the third conversion unit, and the power grid supplies power to the hydrogen production hydrogenation station through the fifth control switch K5, the inversion module and the fourth control switch K4.
Optionally, the method further comprises the following steps:
s3, when the hydrogen capacity value in the hydrogen storage unit of the hydrogen production and hydrogenation station is in the third interval,
when the power generation power of the photovoltaic power supply is in a first range, the control module controls the first control switch K1 and the fourth control switch K4 to be closed, the second control switch K2, the third control switch K3, the fifth control switch K5 and the sixth control switch K6 to be opened, and the photovoltaic power supply supplies power to the hydrogen production and hydrogenation station through the first control switch K1, the second conversion unit and the fourth control switch K4 to accelerate hydrogen production of the hydrogen production and hydrogenation station;
when the generating power of the photovoltaic power supply is in the second range or the third range, the control module controls the fourth control switch K4, the fifth control switch K5 and the sixth control switch K6 to be closed, the first control switch K1, the second control switch K2 and the third control switch K3 to be disconnected, the photovoltaic power supply supplies power to the power grid through the sixth control switch K6 and the third conversion unit, and the power grid supplies power to the hydrogen production hydrogenation station through the fifth control switch K5, the inversion module and the fourth control switch K4.
The utility model provides a hydrogen station power supply load stability control system, unit formula electric capacity module C includes the multiunit, and when arbitrary group unit formula electric capacity module trouble and report to the police to the control module group, dial out or cut out trouble unit formula electric capacity module, voltage fluctuation when the voltage switch-over is eliminated by remaining unit formula electric capacity module.
The first control switch, the second control switch, the third control switch, the fourth control switch, the fifth control switch and the sixth control switch are all load switches, contactors or circuit breakers and are in communication connection with the control module.
The beneficial technical effects are as follows:
according to the hydrogen capacity value in the hydrogen storage unit of the hydrogen production and hydrogenation station and the power generation power of the photovoltaic power supply, the hydrogen capacity value in the hydrogen storage unit of the hydrogen production and hydrogenation station is supplemented fastest, the photovoltaic power supply is in the maximum power value output state under different power generation conditions, and the utilization efficiency of photovoltaic resources is improved.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a structural diagram of a power supply load stability control system of a hydrogen production and hydrogenation station according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of power moments of photovoltaic, wind power and load according to an embodiment of the present invention.
FIG. 3 is a schematic diagram of a PEM hydrogen production unit according to an embodiment of the invention.
Fig. 4 is a schematic diagram of percentage division of photovoltaic power generation power according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should 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 a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
Example one
As shown in fig. 1 to 4, a power supply load stability control system for a hydrogen production and hydrogenation station includes a photovoltaic power supply 1, a first conversion unit 2, an energy storage battery 3, a second conversion unit 4, a first control switch K1, a second control switch K2, a third control switch K3, a fourth control switch K4, a fifth control switch K5, a sixth control switch K6, an inverter module 5 and a control module 6, wherein the control system is connected with a hydrogen production and hydrogenation station 7 and a power grid 8.
The first ends of the first control switch K1 and the second control switch K2 are connected in parallel and then electrically connected with the photovoltaic power supply 1, the second end of the second control switch K2 is electrically connected with the input end of the first conversion unit 2, and the output end of the first conversion unit 2 is electrically connected with the energy storage battery 3; the first end of the third control switch K3 is electrically connected to the energy storage battery 3, the second end of the first control switch K1 is electrically connected to the low-voltage side of the second conversion unit 4 after being connected in parallel with the second end of the third control switch K3, the high-voltage side of the second conversion unit 4 is electrically connected to the input end of the inverter module 5, and a unit capacitor module C is electrically connected between the high-voltage side of the second conversion unit 4 and the input end of the inverter module 5; on one hand, the unit type capacitor module C eliminates voltage fluctuation when the photovoltaic power supply 1 and the power grid 8 switch to supply power to the hydrogen production and hydrogenation station 7; on the other hand, the unit type capacitor modules C comprise a plurality of groups, such as 2-3 groups, when any one group of unit type capacitor modules has a fault and gives an alarm to the control module 6, the fault unit type capacitor modules are only needed to be pulled out or switched out, voltage fluctuation during voltage switching is eliminated by the rest unit type capacitor modules, and light abandonment or power loss of the hydrogen production hydrogen filling station 7 caused by system shutdown caused by the fault of the unit type capacitor modules C is eliminated; the cellular capacitive module C of the third aspect provides power compensation.
Optionally, the power supply load stability control system of the hydrogen production and hydrogenation station is an integrated control system, such as a DCS system, and selects a harmonious time comprehensive monitoring system to coordinate and collect relevant parameters such as power consumption, capacity, internet power generation fluctuation rate, minimum output, voltage fluctuation rate of the power grid, so as to supply power on the internet on the premise of meeting internet conditions, thereby improving the protection degree of stable operation of the power grid and the reasonable utilization degree of resources. The comprehensive monitoring system improves the convenience degree of overall scheduling, reduces the operation difficulty and improves the operation safety degree of the system.
Optionally, sensor units are added in the photovoltaic power supply 1, the first conversion unit 2, the energy storage battery 3, the second conversion unit 4, the first control switch K1, the second control switch K2, the third control switch K3, the fourth control switch K4, the fifth control switch K5, the sixth control switch K6, the inverter module 5, the control module 6, the hydrogen production and hydrogenation station 7, the power grid 8 and the third conversion unit 10, and sensor signals are accessed into the comprehensive monitoring system, so that monitoring feedback is performed on main environmental conditions (such as hydrogen content in air) of a system related to the whole process, devices, operation parameters (such as battery capacity, hydrogen content in a hydrogen storage unit or real-time power generation power of the photovoltaic power supply), and corresponding protection thresholds or protection parameters or early warning parameters are set, and equipment or modules which do not have operation conditions are shut down, so as to avoid operation risks.
The first connection end of the inversion module 5 is electrically connected with one end of the fourth control switch K4, the second connection end of the inversion module 5 is electrically connected with one end of the fifth control switch K5, the other end of the fourth control switch K4 is electrically connected with the hydrogen production and hydrogenation station 7, the hydrogen production and hydrogenation station 7 is connected with the electric automobile 9 through a hydrogenation cabinet body, a hydrogen storage unit of the hydrogen production and hydrogenation station 7 provides hydrogen for the electric automobile 9 through the hydrogenation cabinet body, and the other end of the fifth control switch K5 is electrically connected with the power grid 8; the inverter module 5 is provided with an inverter circuit 51 and a filter unit 52 electrically connected with the inverter circuit 51, one end of the inverter circuit 51 corresponds to the input end of the inverter module 5, and one end of the filter unit 52 corresponds to the other end of the inverter module 51.
One end of the sixth control switch K6 is electrically connected to the photovoltaic power supply 1, the other end of the sixth control switch K6 is electrically connected to the first end of the third converting unit 10, the second end of the third converting unit 10 is electrically connected to the power grid 8, and the third converting unit 10 can also operate in a DC/DC mode, an AC/DC mode or a DC/AC mode.
Since the sunlight intensity is in a state of continuous fluctuation, the stability of the dc power output from the photovoltaic power supply 1 is insufficient, and in this case, if the dc power output from the photovoltaic power supply 1 is directly supplied to the hydrogen production and hydrogenation station 7 or the power grid 8, the power supply quality is poor. In order to solve this problem, in an alternative embodiment, the unstable voltage is converted into a stable voltage by the first conversion unit, the second conversion unit or the third conversion unit. Wherein the second converter can also realize bidirectional flow of electric energy, and the first converter can also work in a DC/DC mode, such as: in the DC/DC mode, the first converter may convert the received DC input power to DC output power.
Optionally, the second conversion unit 4 is a bidirectional DC/DC unit.
Control module 6 with first control switch K1, second control switch K2, third control switch K3, fourth control switch K4, fifth control switch K5 and sixth control switch K6 electric connection, be used for control first control switch K1, second control switch K2, third control switch K3, fourth control switch K4, fifth control switch K5 and sixth control switch K6's break-make, inversion module 5 control end, first conversion unit 2 control end, second conversion unit 4 control end and third conversion unit 10 control end respectively with control module 6 electric connection, control module 6 control first conversion unit 2, second conversion unit 4 and third conversion unit 10 make corresponding drive conversion action.
As shown in fig. 3, the PEM hydrogen production and hydrogenation station 7 includes a hydrogen production unit, a power input terminal 71 and a hydrogen storage unit.
A hydrogen production unit: the hydrogen is prepared by directly decomposing water and can be realized by adopting a plurality of modes: the hydrogen production by water decomposition is specifically a water electrolysis hydrogen production technology, a photocatalytic water decomposition hydrogen production technology or a thermochemical cycle water decomposition hydrogen production technology and the like. Electrolyzing water by using electric energy to generate hydrogen and oxygen; thermochemical cycle decomposition of water by using solar energy, wind energy or geothermal energy to produce hydrogen; the light energy is utilized to directly decompose water through a catalyst to prepare hydrogen. The prepared hydrogen enters a hydrogen storage unit for storage. Hydrogen is mainly generated by water decomposition, and embodiments may be, but are not limited to, photolyzed water, electrolyzed water, pyrolyzed water, and the like.
A hydrogen storage unit: the hydrogen production unit mainly comprises a hydrogen storage material and a hydrogen storage tank for placing the hydrogen storage material, wherein the hydrogen storage tank is provided with a hydrogen input port and a hydrogen output port, and the hydrogen storage material is positioned in the hydrogen storage tank. The tank body of the hydrogen storage tank can be made of polytetrafluoroethylene materials, stainless steel and the like, and is characterized by high pressure resistance, seepage prevention and corrosion resistance.
Hydrogen storage materials mainly include the following: 1) Physical adsorption type hydrogen storage material-reversibly adsorbed on high specific surface area porous material by physical action mode, such as carbon-based material (graphite, activated carbon, carbon nano tube) or inorganic porous material (such as zeolite molecular sieve) and Metal Organic Framework (MOF) [ Metal Organic Framework (MOF) is Cu 2 (L 2 )(H 2 O) 2 IRMOF-11 or IRMOF-20, etc]. 2) Metal hydride hydrogen storage materials including light metal hydrides (such as Mg-based series, specifically elemental magnesium hydrogen storage materials, magnesium-based composite hydrogen storage materials and magnesium-based alloy hydrogen storage materials) or higher alloy hydrides (such as LaNi 5 Or a TiFe alloy, etc.). 3) Chemical hydride hydrogen storage materials including sodium alanate, lithium alanate, calcium alanate, lithium nitrogen hydrogen system or ammonia borane, and the like. 4) And organic liquid hydrogen storage materials including aromatic ring compounds such as benzene, toluene, naphthalene and the like, fused heterocyclic compounds and the like. The catalyst is noble metal catalyst, ni catalyst, homogeneous catalyst, etc.
The hydrogen storage unit of the hydrogen production and hydrogenation station 7 is provided with a hydrogen capacity measuring component, the hydrogen stored in the hydrogen storage unit of the hydrogen production and hydrogenation station 7 is consumed after the electric automobile 9 is hydrogenated so that the hydrogen capacity value in the hydrogen storage unit changes, and the hydrogen capacity measuring component monitors and measures the hydrogen capacity value and transmits the hydrogen capacity value to the control module 6 through a network. The hydrogen capacity value in the hydrogen storage unit of the hydrogen production and hydrogenation station 7 accounts for 60-100% of the rated capacity percentage and is set as a first interval, the range of 40-60% is set as a second interval and the range of 20-40% is set as a third interval.
The range of 70-100% of the generated power of the photovoltaic power source 1 in percentage of the rated power is set as a first range, the range of 40-70% is set as a second range, and the range of 0-40% is set as a third range.
The method for controlling the stability of the power supply load of the hydrogen production and hydrogenation station comprises the following steps:
s1, when the hydrogen capacity value in the hydrogen storage unit of the hydrogen production and hydrogenation station 7 is in a first interval,
when the generated power of the photovoltaic power supply 1 is in a first range, if the generated power change rate of the photovoltaic power supply 1 is less than 10%, the control module 6 controls the first control switch K1, the fourth control switch K4 and the sixth control switch K6 to be closed, the second control switch K2, the third control switch K3 and the fifth control switch K5 to be opened, on one hand, the photovoltaic power supply 1 supplies power to the hydrogen production and hydrogenation station 7 through the first control switch K1, the second conversion unit 4 and the fourth control switch K4, and on the other hand, the sixth control switch K6 and the third conversion unit 10 supply power to the power grid 8;
when the generated power of the photovoltaic power supply 1 is in a second range, the control module 6 controls the first control switch K1 and the fourth control switch K4 to be closed, the second control switch K2, the third control switch K3, the fifth control switch K5 and the sixth control switch K6 to be opened, and the photovoltaic power supply 1 supplies power to the hydrogen production and hydrogenation station 7 through the first control switch K1, the second conversion unit 4 and the fourth control switch K4;
when the generated power of the photovoltaic power supply 1 is in a third range, the control module 6 controls the first control switch K1, the second control switch K2, the third control switch K3 and the fourth control switch K4 to be closed, the fifth control switch K5 and the sixth control switch K6 to be opened, and the photovoltaic power supply 1 supplies power to the hydrogen production and hydrogenation station 7 through the first control switch K1, the second control switch K2, the first conversion unit 2, the energy storage battery 3, the third control switch K3, the second conversion unit 4 and the fourth control switch K4;
in step S1, when the hydrogen capacity value in the hydrogen storage unit of the hydrogen refueling station is in the first interval, according to different ranges of the power generation power of the photovoltaic power source, the hydrogen capacity value in the hydrogen storage unit of the hydrogen production refueling station is supplemented at the fastest speed, and the utilization efficiency of the photovoltaic resource is improved.
S2, when the hydrogen capacity value in the hydrogen storage unit of the hydrogen production and hydrogenation station 7 is in the second interval,
when the power generation power of the photovoltaic power supply 1 is in a first range, the control module 6 controls the first control switch K1 and the fourth control switch K4 to be closed, the second control switch K2, the third control switch K3, the fifth control switch K5 and the sixth control switch K6 to be opened, and the photovoltaic power supply 1 supplies power to the hydrogen production and hydrogenation station 7 through the first control switch K1, the second conversion unit 4 and the fourth control switch K4 to accelerate the hydrogen production of the hydrogen production and hydrogenation station 7;
when the generated power of the photovoltaic power supply 1 is in a second range, the control module 6 controls the first control switch K1, the second control switch K2, the third control switch K3 and the fourth control switch K4 to be closed, the fifth control switch K5 and the sixth control switch K6 to be opened, and the photovoltaic power supply 1 supplies power to the hydrogen production and hydrogenation station 7 through the first control switch K1, the second control switch K2, the first conversion unit 2, the energy storage battery 3, the third control switch K3, the second conversion unit 4 and the fourth control switch K4;
when the generated power of the photovoltaic power supply 1 is in a third range, the control module 6 controls the fourth control switch K4, the fifth control switch K5 and the sixth control switch K6 to be closed, the first control switch K1, the second control switch K2 and the third control switch K3 to be opened, the photovoltaic power supply 1 supplies power to the power grid 8 through the sixth control switch K6 and the third conversion unit 10, and the power grid 8 supplies power to the hydrogen production and hydrogenation station 7 through the fifth control switch K5, the inverter module 5 and the fourth control switch K4;
s3, when the hydrogen capacity value in the hydrogen storage unit of the hydrogen production and hydrogenation station 7 is in the third interval,
when the power generation power of the photovoltaic power supply 1 is in a first range, the control module 6 controls the first control switch K1 and the fourth control switch K4 to be closed, the second control switch K2, the third control switch K3, the fifth control switch K5 and the sixth control switch K6 to be opened, and the photovoltaic power supply 1 supplies power to the hydrogen production and hydrogenation station 7 through the first control switch K1, the second conversion unit 4 and the fourth control switch K4 to accelerate the hydrogen production of the hydrogen production and hydrogenation station 7;
when the generated power of the photovoltaic power supply 1 is in a second range or a third range, the control module 6 controls the fourth control switch K4, the fifth control switch K5 and the sixth control switch K6 to be closed, the first control switch K1, the second control switch K2 and the third control switch K3 to be opened, the photovoltaic power supply 1 supplies power to the power grid 8 through the sixth control switch K6 and the third conversion unit 10, and the power grid 8 supplies power to the hydrogen production and hydrogenation station 7 through the fifth control switch K5, the inverter module 5 and the fourth control switch K4;
example two
The difference between the second embodiment and the first embodiment is that the method further comprises the following steps:
s4, when the photovoltaic power supply 1 has no power output, the control module 6 controls the third control switch K3, the fourth control switch K4 and the fifth control switch K5 to be closed, the first control switch K1, the second control switch K2 and the sixth control switch K6 to be disconnected, the power grid 8 supplies power to the hydrogen production and hydrogenation station 7 through the fifth control switch K5, the inversion module 5 and the fourth control switch K4 on one hand, and the power grid 8 charges the energy storage battery 3 in a floating mode or in a uniform and constant mode through the inversion module 5, the second conversion unit 4 and the third control switch K3 on the second hand;
EXAMPLE III
The difference between the third embodiment and the second embodiment is that the power grid 8 or the energy storage battery 3 is used for supplying power to the hydrogen production and hydrogenation station 7 to improve the power supply reliability, and the method further comprises the following steps:
s5, the control module 6 controls the first control switch K1 and the second control switch K2 to be switched off, and the third control switch K3, the fourth control switch K4 and the fifth control switch K5 to be switched on;
when the power grid 8 works normally, the power grid 8 charges the energy storage battery 3 through the inverter module 5 and the second conversion unit 4, the inverter module 5 works in a rectification state, and the inverter circuit 51 and the filter unit 52 form a power factor correction circuit;
when the power grid 8 fails, the energy storage battery 3 provides a backup uninterrupted power supply for the hydrogen production and hydrogenation station 7 through the second conversion unit 4 and the inversion module 5;
example four
The difference between the fourth embodiment and the first embodiment is that the method includes the step of tracking the maximum output power value of the photovoltaic power source 1:
s6, the control module 6 controls the third control switch K3 and the fifth control switch K5 to be switched off, the first control switch K1, the second control switch K2 and the fourth control switch K4 are switched on, at the moment, the photovoltaic power supply 1, the second conversion unit 4, the unit type capacitor module C, the inverter module 5, the control module 6 and the hydrogen production and hydrogenation station 7 form a first photovoltaic off-grid inverter system, the second conversion unit 4 and the first conversion unit 2 work in an MPPT mode in a combined mode, the control module 6 measures the output voltage value and the output current value of the photovoltaic power supply 1 in real time and tracks the maximum output power value of the photovoltaic power supply 1 to ensure that the photovoltaic power supply 1 is in the maximum power value output state under different environmental conditions, the photovoltaic power supply 1 directly supplies power to the hydrogen production and hydrogenation station 7 and simultaneously charges the energy storage battery 3, so that the charging and discharging times of the energy storage battery 3 are reduced, and the service life of the energy storage battery 3 is prolonged;
s7, the control module 6 controls the first control switch K1 and the fifth control switch K5 to be switched off, the second control switch K2, the third control switch K3 and the fourth control switch K4 to be switched on, at the moment, the photovoltaic power supply 1, the first conversion unit 2, the energy storage battery 3, the second conversion unit 4, the unit type capacitor module C, the inversion module 5, the control module 6 and the hydrogen production and hydrogenation station 7 form a second photovoltaic off-grid inverter system, the first conversion unit 2 works in an MPPT mode, the control module 6 detects the output voltage value and the output current value of the photovoltaic power supply 1 in real time and tracks the maximum output power value of the photovoltaic power supply 1, the photovoltaic power supply 1 is ensured to be in the maximum output state under different environmental conditions, and at the moment, the photovoltaic power supply 1 and the energy storage battery 3 jointly supply power to the hydrogen production and hydrogenation station 7;
s8, the control module 6 controls the second control switch K2, the third control switch K3 and the fourth control switch K4 to be disconnected, the first control switch K1 and the fifth control switch K5 are closed, at the moment, the photovoltaic power supply 1, the second conversion unit 4, the unit capacitor module C, the inversion module 5, the control module 6 and the power grid 8 form a photovoltaic grid-connected inverter system, the second conversion unit 4 works in an MPPT mode, the control module 6 measures the output voltage value and the output current value of the photovoltaic power supply 1 in real time and tracks the maximum output power value of the photovoltaic power supply 1 to ensure that the photovoltaic power supply 1 is in a maximum power value output state under different environmental conditions, and the electric energy converted by the photovoltaic power supply 1 absorbing light energy and solar energy is boosted by the second conversion unit 4 and inverted by the inversion module 5 and then is connected to the power grid 8 in parallel to generate electricity.
In conclusion, according to the different ranges of the hydrogen capacity value in the hydrogen storage unit of the hydrogen production and hydrogenation station and the different ranges of the power generation power of the photovoltaic power supply, the hydrogen capacity value in the hydrogen storage unit of the hydrogen production and hydrogenation station is supplemented fastest, the photovoltaic power supply is in the maximum power value output state under different power generation conditions, and the utilization efficiency of the photovoltaic resource is improved.
Those of ordinary skill in the art will appreciate that the various illustrative components and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the components and steps of the various examples have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
It should be noted that the numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. A power supply load stability control system of a hydrogen production and hydrogenation station is characterized by comprising a photovoltaic power supply, a first conversion unit, an energy storage battery, a second conversion unit, a first control switch K1, a second control switch K2, a third control switch K3, a fourth control switch K4, a fifth control switch K5, a sixth control switch K6, an inversion module and a control module, wherein the control system is connected with the hydrogen production and hydrogenation station and a power grid;
the first ends of the first control switch K1 and the second control switch K2 are electrically connected with the photovoltaic power supply after being connected in parallel, the second end of the second control switch K2 is electrically connected with the input end of the first conversion unit, and the output end of the first conversion unit is electrically connected with the energy storage battery; the first end of the third control switch K3 is electrically connected with the energy storage battery, the second end of the first control switch K1 is electrically connected with the second end of the third control switch K3 in parallel and then is electrically connected with the low-voltage side of the second conversion unit, the high-voltage side of the second conversion unit is electrically connected with the input end of the inversion module, and the high-voltage side of the second conversion unit is electrically connected with the input end of the inversion module to form a unit type capacitor module C.
2. The hydrogen production hydrogenation station power supply load stability control system according to claim 1, characterized in that the control system further comprises a DCS integrated monitoring system.
3. A power supply load stability control method for a hydrogen production and hydrogenation station comprises the power supply load stability control system for the hydrogen production and hydrogenation station as claimed in any one of claims 1 to 2, and is characterized in that the hydrogen capacity value in the hydrogen storage unit of the hydrogen production and hydrogenation station accounts for 60-100% of the rated capacity percentage and is in a first interval, 40-60% of the hydrogen capacity value is in a second interval, and 20-40% of the hydrogen capacity value is in a third interval;
the range of the generated power of the photovoltaic power source accounting for 70-100% of the rated power percentage is a first range, the range of 40-70% is a second range, and the range of 0-40% is a third range;
the method comprises the following steps:
s1, when the hydrogen capacity value in the hydrogen storage unit of the hydrogen production and hydrogenation station is in a first interval,
when the generating power of the photovoltaic power supply is in a first range, if the generating power change rate of the photovoltaic power supply is smaller than 10%, the control module controls the first control switch K1, the fourth control switch K4 and the sixth control switch K6 to be closed, the second control switch K2, the third control switch K3 and the fifth control switch K5 to be disconnected, the photovoltaic power supply supplies power to the hydrogen production hydrogenation station through the first control switch K1, the second conversion unit and the fourth control switch K4 on one hand, and supplies power to the power grid through the sixth control switch K6 and the third conversion unit on the other hand.
4. The method of claim 3, wherein step S1 further comprises the steps of:
when the generated power of the photovoltaic power supply is in a third range, the control module controls the first control switch K1, the second control switch K2, the third control switch K3 and the fourth control switch K4 to be closed, the fifth control switch K5 and the sixth control switch K6 to be disconnected, and the photovoltaic power supply supplies power to the hydrogen production and hydrogenation station through the first control switch K1, the second control switch K2, the first conversion unit, the energy storage battery, the third control switch K3, the second conversion unit and the fourth control switch K4.
5. The method of claim 4, further comprising the steps of:
s2, when the hydrogen capacity value in the hydrogen storage unit of the hydrogen production and hydrogenation station is in the second interval,
when the generating power of the photovoltaic power supply is located a first range, the control module controls the first control switch K1 and the fourth control switch K4 to be closed, the second control switch K2, the third control switch K3, the fifth control switch K5 and the sixth control switch K6 to be disconnected, and the photovoltaic power supply supplies power to the hydrogen production and hydrogenation station through the first control switch K1, the second conversion unit and the fourth control switch K4 to accelerate the hydrogen production of the hydrogen production and hydrogenation station.
6. The method of claim 5, wherein step S2 further comprises the steps of:
when the generated power of the photovoltaic power supply is in the second range, the control module controls the first control switch K1, the second control switch K2, the third control switch K3 and the fourth control switch K4 to be closed, the fifth control switch K5 and the sixth control switch K6 to be disconnected, and the photovoltaic power supply supplies power to the hydrogen production and hydrogenation station through the first control switch K1, the second control switch K2, the first conversion unit, the energy storage battery, the third control switch K3, the second conversion unit and the fourth control switch K4.
7. The method of claim 6, wherein step S2 further comprises the steps of:
when the generated power of the photovoltaic power supply is in a third range, the control module controls the fourth control switch K4, the fifth control switch K5 and the sixth control switch K6 to be closed, the first control switch K1, the second control switch K2 and the third control switch K3 to be disconnected, the photovoltaic power supply supplies power to the power grid through the sixth control switch K6 and the third conversion unit, and the power grid supplies power to the hydrogen production hydrogenation station through the fifth control switch K5, the inversion module and the fourth control switch K4.
8. The method of claim 7, further comprising the steps of:
s3, when the hydrogen capacity value in the hydrogen storage unit of the hydrogen production and hydrogenation station is in the third interval,
when the generating power of the photovoltaic power supply is located a first range, the control module controls the first control switch K1 and the fourth control switch K4 to be closed, the second control switch K2, the third control switch K3, the fifth control switch K5 and the sixth control switch K6 to be disconnected, and the photovoltaic power supply supplies power to the hydrogen production and hydrogenation station through the first control switch K1, the second conversion unit and the fourth control switch K4 to accelerate the hydrogen production of the hydrogen production and hydrogenation station.
9. The method of claim 8, wherein step S3 further comprises the steps of:
when the generating power of the photovoltaic power supply is in the second range or the third range, the control module controls the fourth control switch K4, the fifth control switch K5 and the sixth control switch K6 to be closed, the first control switch K1, the second control switch K2 and the third control switch K3 to be disconnected, the photovoltaic power supply supplies power to the power grid through the sixth control switch K6 and the third conversion unit, and the power grid supplies power to the hydrogen production hydrogenation station through the fifth control switch K5, the inversion module and the fourth control switch K4.
10. The method of claim 9, wherein step S3 further comprises the steps of:
when the photovoltaic power supply has no power output, the control module controls the third control switch K3, the fourth control switch K4 and the fifth control switch K5 to be closed, the first control switch K1, the second control switch K2 and the sixth control switch K6 to be disconnected, the power grid supplies power to the hydrogen production hydrogenation station through the fifth control switch K5, the inversion module and the fourth control switch K4 on one hand, and the power grid floats to charge the energy storage battery or charges the energy storage battery uniformly and constantly through the inversion module, the second conversion unit and the third control switch K3 on the second hand.
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