CN114825393A - Hybrid energy and hydrogen storage device for new energy station - Google Patents

Hybrid energy and hydrogen storage device for new energy station Download PDF

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Publication number
CN114825393A
CN114825393A CN202210718842.5A CN202210718842A CN114825393A CN 114825393 A CN114825393 A CN 114825393A CN 202210718842 A CN202210718842 A CN 202210718842A CN 114825393 A CN114825393 A CN 114825393A
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power
energy storage
storage system
hydrogen
energy
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CN114825393B (en
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罗桂平
王志强
苏森
韩坤
陈胜林
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Hebei Maglev Energy Technology Co ltd
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Huachi Kinetic Energy Beijing Technology 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
    • H02J3/28—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
    • H02J15/003—Systems for storing electric energy in the form of hydraulic 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
    • H02J15/006—Systems for storing electric energy in the form of pneumatic energy, e.g. compressed air energy storage [CAES]
    • 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
    • H02J15/007—Systems for storing electric energy involving storage in the form of mechanical energy, e.g. fly-wheels
    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • H02J3/241—The oscillation concerning frequency
    • 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
    • H02J3/30—Arrangements for balancing of the load in a network by storage of energy using dynamo-electric machines coupled to flywheels
    • 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
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • 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
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/28—The renewable source being wind energy
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/40—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously
    • 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 invention provides a hybrid energy and hydrogen storage device for a new energy station, wherein a hybrid energy storage system and a hydrogen production system which are composed of a wind power system, a photovoltaic power generation system and a long-time and short-time energy storage system are connected to the same alternating current power grid, and electric energy generated by the wind power system and the photovoltaic power generation system is selectively charged into the hybrid energy storage system or applied to the hydrogen production system to generate hydrogen energy for storage under the control of an energy storage and hydrogen storage control module. According to the invention, on one hand, the short-time energy storage system is utilized to optimize the power grid frequency and stabilize the fluctuation of new energy, and on the other hand, the energy storage system can provide long-time energy storage guarantee and shift peaks and fill valleys by utilizing more than 1 hour; during the peak period of power generation, hydrogen is generated by methods of hydrogen production by water electrolysis and the like and is stored in a hydrogen storage alloy hydrogen storage system, thereby reducing wind and light abandonment and promoting new energy consumption.

Description

Hybrid energy and hydrogen storage device for new energy station
Technical Field
The invention relates to the technical field of power generation equipment, in particular to a hybrid energy and hydrogen storage device for a new energy station.
Background
Power systems have high stability requirements. The electric energy is transmitted at the speed of light, and can not be stored in large scale, and the transmission, distribution and distribution are completed by instantaneous synchronization, and the whole electric power system is in a dynamic balance state at all times. In steady state operation, the active power generated by the generator and the active power consumed by the load in the power system are balanced, and the system frequency maintains a rated value. When the power of the power supply is larger than the power of the load, the frequency of the system is increased; otherwise the system frequency decreases. Therefore, the power grid needs to ensure that the frequency is in a qualified range through means of primary frequency modulation, secondary frequency modulation and the like, otherwise, the influence on the operation of loads or power generation equipment is generated, and even the frequency breakdown is caused in serious conditions, so that large-area power failure is caused.
Renewable energy power generation has strong intermittency and fluctuation. Renewable energy power generation relies on natural conditions, with intermittent and fluctuating characteristics in nature. For example, in wind power generation, natural wind blows blades of a fan to drive a transmission shaft to rotate, so that kinetic energy of the wind is converted into mechanical kinetic energy and then into electric energy, and the electric energy output by the wind power generation is intermittent due to the intermittent characteristic of the wind power; the photovoltaic power generation utilizes the photovoltaic effect to directly convert light energy into electric energy, the power generation power of the photovoltaic power generation is directly influenced by the illumination intensity, although the illumination intensity of a region is generally unchanged in the whole year, the illumination intensity generally gradually increases from morning to noon to be the strongest, then gradually decreases to night to be the weakest, and meanwhile, the illumination intensity has certain randomness within an hour period, so the photovoltaic power generation output also has the characteristics of intermittence and volatility.
The high proportion of intermittent renewable energy sources is connected to the grid, which will impact the stability of the grid. After the high-proportion intermittent new energy is connected into the power system, the conventional power supply not only needs to follow the load change, but also needs to balance the output fluctuation of the new energy, and the power grid adjustment difficulty is increased.
The existing energy storage technologies generally include electrochemical energy storage, compressed air energy storage, hydrogen storage, and other forms. The different types of energy storage technologies are mainly distinguished by different charging and discharging efficiencies, energy storage capacities, energy storage time spans, charging and discharging cycle lives and the like. According to different characteristics of energy storage technologies, the application of the energy storage technology in the scenes of peak regulation, frequency modulation, voltage regulation, standby and the like of a power system is different. Electrochemical energy storage is mainly based on lithium batteries, but has the disadvantages of easy combustion and explosion, poor cycle life, high maintenance cost, environmental pollution and the like. In the aspect of hydrogen storage, the prior art generally adopts a high-pressure hydrogen storage tank for storage, and has the defects of low hydrogen storage density, insecurity, low hydrogen purity and the like.
Disclosure of Invention
The invention provides a hybrid energy storage and hydrogen storage device for a new energy station, aiming at optimizing the frequency of a power grid by using a short-time energy storage system and stabilizing the fluctuation of new energy, and providing long-time energy storage guarantee and shifting peaks and valleys by using the energy storage system for more than 1 hour; during the peak period of power generation, hydrogen is generated by methods of hydrogen production by water electrolysis and the like and is stored in a hydrogen storage alloy hydrogen storage system, thereby reducing wind and light abandonment and promoting new energy consumption.
To this end, the invention proposes a hybrid energy and hydrogen storage device for a new energy station, comprising:
one end of the first parallel branch is connected to a power generation system of the new energy station, and the other end of the first parallel branch is connected to an alternating current power grid;
one end of the second parallel branch is connected with the long-time and/or short-time energy storage system, and the other end of the second parallel branch is connected to the alternating current power grid;
one end of the third parallel branch is connected with the hydrogen production system, and the other end of the third parallel branch is connected with the alternating current power grid;
and the energy storage and hydrogen storage control module is used for controlling the long-term and/or short-term energy storage system to charge and discharge energy and controlling the hydrogen production system to produce hydrogen according to the real-time power generation state of the power generation system and the real-time power utilization state of the alternating current power grid.
The first parallel branch comprises a first transformer and a first converter, one end of the first transformer is connected with one end of the first converter, the other end of the first transformer is connected with an alternating current power grid, and the other end of the first converter is connected with a power generation system; the power generation system is a wind power system and/or a photovoltaic power generation system of the new energy station, and when the wind power system and the photovoltaic power generation system exist simultaneously, the wind power system and the photovoltaic power generation system are connected with an alternating current power grid through a first parallel branch.
The second parallel branch comprises a second converter, one end of the second converter is connected with the long-time and/or short-time energy storage system, the other end of the second converter is connected with an energy and hydrogen storage control module, and the energy and hydrogen storage control module is connected to an alternating current power grid through a second transformer; the alternating current power grid is a 10kV or 350kV alternating current power grid.
The short-time energy storage system comprises at least one of flywheel energy storage, a super capacitor and superconducting energy storage, and the continuous charging and discharging time is not more than 15 minutes; the long-term energy storage system comprises at least one of a lithium battery, a lead-acid battery, a sodium-sulfur battery, a flow battery, compressed air energy storage and pumped storage, and the charge-discharge duration is not less than 1 hour; when the short-term energy storage system and the long-term energy storage system exist at the same time, a hybrid energy storage system is formed.
In the third parallel branch, the hydrogen production system is connected to an alternating current power grid through an energy storage and hydrogen storage control module and a second transformer.
Wherein, when the short-time energy storage system is a flywheel energy storage system, the rotation energy of the flywheel is
Figure 435148DEST_PATH_IMAGE001
Wherein J is the moment of inertia of the flywheel rotor,
Figure 742633DEST_PATH_IMAGE002
is the rotor angular velocity; for a rotor with a uniform mass distribution,
Figure DEST_PATH_IMAGE003
wherein R is the radius of the rotor, and n is the rotating speed of the rotor;
the rotating speed of the rotor when the flywheel is fully charged is n in the running process max The rotor speed in standby is n min Then, then
The energy storage capacity of the flywheel energy storage system is represented as:
Figure 570911DEST_PATH_IMAGE004
the energy storage and hydrogen storage control module acquires the frequency of the grid-connected AC power grid according to the real-time power utilization state of the AC power grid, judges whether the frequency is in the primary frequency modulation dead zone range of the new energy station, and sets the dead zone range to be-f according to the power grid requirement DB ≤f≤f DB Rated frequency f of the grid 0 ；
At the peak of power generation, if the power required by the power grid dispatching AGC instruction is less than the power generated by the wind power station and the photovoltaic station, the power generated by the wind power station and the photovoltaic station can generate excessive electric energy, so that a part of electric energy can not be on line, and the phenomenon of power limitation exists, at the moment:
(1) if the frequency of the AC mains is-f DB ≤f≤f DB And f < -f DB And then, the hybrid energy storage system does not carry out power grid frequency optimization and adjustment, and executes the following strategies:
if in the hybrid energy storage system, the short-time energy storage system stores the electric quantity
Figure DEST_PATH_IMAGE005
1 and long-term energy storage system
Figure 367966DEST_PATH_IMAGE005
Figure 367966DEST_PATH_IMAGE005
2 satisfies the condition that 95 percent is less than or equal to
Figure 648906DEST_PATH_IMAGE006
Less than or equal to 100 percent and less than or equal to 95 percent
Figure DEST_PATH_IMAGE007
Less than or equal to 100 percent of hybrid energy storage systemWhen the system does not work, the hydrogen production system starts to work to produce hydrogen;
if the short-time energy storage system stores the electric quantity
Figure 822398DEST_PATH_IMAGE005
1 and long-term energy storage system
Figure 36342DEST_PATH_IMAGE005
Figure 36342DEST_PATH_IMAGE005
2 satisfies 0 ≤
Figure 4298DEST_PATH_IMAGE005
1 is less than 95 percent and less than or equal to 95 percent
Figure 100430DEST_PATH_IMAGE007
If the charging power is less than or equal to 100%, the short-time energy storage system starts to charge according to the requirement, and the charging power = min { power generation of a wind power station, power required by a power grid dispatching AGC instruction, maximum charging power of the short-time energy storage system };
if the short-time energy storage system stores the electric quantity
Figure 749717DEST_PATH_IMAGE005
1 and long-term energy storage system
Figure 614905DEST_PATH_IMAGE005
Figure 614905DEST_PATH_IMAGE005
2 satisfies 0 ≤
Figure 753762DEST_PATH_IMAGE005
2 is less than 95 percent and is less than or equal to 95 percent
Figure 997575DEST_PATH_IMAGE006
The charging power is = min { power generation of wind power and photovoltaic stations-power required by a power grid dispatching AGC instruction, maximum charging power of the long-term energy storage system };
if the short-time energy storage system stores the electric quantity
Figure 247291DEST_PATH_IMAGE005
1 and long-term energy storage system
Figure 232565DEST_PATH_IMAGE005
Figure 232565DEST_PATH_IMAGE005
2 satisfies 0 ≤
Figure 745586DEST_PATH_IMAGE005
1 is less than 95 percent and less than or equal to 0
Figure 816310DEST_PATH_IMAGE005
When the charging power is less than 2% and less than 95%, the short-time energy storage system starts charging preferentially, and the charging power = min { power generation of a wind power station, power required by a power grid dispatching AGC instruction, and maximum charging power of the short-time energy storage system };
when the short-time energy storage system stores the electric quantity
Figure 807400DEST_PATH_IMAGE005
When the charging power is 1=100%, the long-term energy storage system starts to be charged according to the requirement, and the charging power = min { power generated by a wind power station, a photovoltaic station-power generation-power required by a power grid dispatching AGC instruction, and the maximum charging power of the long-term energy storage system };
when the short-time energy storage system stores the electric quantity
Figure 647180DEST_PATH_IMAGE005
1=100% long-term energy storage system power storage
Figure 127839DEST_PATH_IMAGE007
After the hydrogen production system is operated for generating hydrogen after the hydrogen production system is operated for 100 percent;
(2) if the grid frequency f > f DB During the process, the hybrid energy storage system preferentially carries out power grid frequency optimization adjustment, the energy storage and hydrogen storage control module analyzes and calculates the power demand, and sends an instruction to preferentially absorb power by the short-time energy storage system until the power grid frequency approaches to the power grid rated frequency f 0 Or short-time energy storage system power storage
Figure 357964DEST_PATH_IMAGE008
1= 100%; at this time:
if the stored energy of the energy storage system is long
Figure 215061DEST_PATH_IMAGE007
Satisfies the condition that the content is more than or equal to 0
Figure 909348DEST_PATH_IMAGE007
Less than or equal to 5 percent, and the long-term energy storage system does not work;
if the electricity storage capacity of the energy storage system is 5% <fora long time
Figure 498592DEST_PATH_IMAGE007
The charging power is less than or equal to 100%, the long-term energy storage system is charged as required, and the charging power is = min { power generation of a wind power station and a photovoltaic station-power required by a power grid dispatching AGC instruction, and the maximum charging power of the long-term energy storage system };
when long term energy storage system electric quantity
Figure 543908DEST_PATH_IMAGE007
After the hydrogen production system is operated for generating hydrogen after the hydrogen production system is operated for 100 percent;
if the power required by the power grid dispatching AGC instruction = the wind power and the power generation of the photovoltaic station, the wind power and the photovoltaic station can generate power according to the power generation, and the phenomena of wind abandon and light abandon do not exist, and at the moment, the hybrid energy storage system and the hydrogen production system do not work;
if the power required by the power grid dispatching AGC instruction is larger than the power which can be generated by the wind power station and the photovoltaic station, the wind power station and the photovoltaic station can generate power according to the generated power, the phenomena of wind abandoning and light abandoning do not exist, and a certain power generation internet space also exists, at the moment:
(1) if the frequency of the network-f DB ≤f≤f DB And the hybrid energy storage system does not perform power grid frequency optimization adjustment, and executes the following strategies:
if the stored energy of the energy storage system is long
Figure 939118DEST_PATH_IMAGE005
2 satisfies 0 ≤
Figure 160015DEST_PATH_IMAGE007
Less than or equal to 5 percent, and the hybrid energy storage system and the hydrogen production system do not work;
if the electricity storage capacity of the energy storage system is 5% <fora long time
Figure 248056DEST_PATH_IMAGE007
Less than or equal to 100%, discharging the long-term energy storage system as required, wherein the discharging power = min { power-wind power, power generation of a photovoltaic station, maximum discharging power of the long-term energy storage system, required by a power grid dispatching AGC instruction }, until the electricity storage quantity of the long-term energy storage system is up
Figure 515090DEST_PATH_IMAGE007
=0, the long-term energy storage system stops working; during which the hydrogen production system is not operating;
(2) if the grid frequency f < -f DB The hybrid energy storage system preferentially carries out power grid frequency optimization adjustment, the energy storage and hydrogen storage control module analyzes and calculates power demand, and sends an instruction to preferentially output power by the short-time energy storage system until the power grid frequency approaches to the power grid rated frequency f 0 Or short-time energy storage system electric quantity storage
Figure 917252DEST_PATH_IMAGE005
1= 0; at this time:
if the stored energy of the energy storage system is long
Figure 320552DEST_PATH_IMAGE005
2 satisfies 0 ≤
Figure 517178DEST_PATH_IMAGE007
Less than or equal to 5 percent, and the hybrid energy storage system and the hydrogen production system do not work;
if the electricity storage capacity of the long-term energy storage system is 5% <
Figure 271507DEST_PATH_IMAGE007
Less than or equal to 100%, discharging the long-term energy storage system as required, wherein the discharging power = min { power-wind power, power generation of a photovoltaic station, maximum discharging power of the long-term energy storage system, required by a power grid dispatching AGC instruction }, until the electricity storage quantity of the long-term energy storage system is up
Figure 8519DEST_PATH_IMAGE007
=0, the long-term energy storage system stops working; during which the hydrogen production system is not operating;
(3) if the grid frequency f > f DB The hybrid energy storage system preferentially carries out power grid frequency optimization adjustmentThe energy storage and hydrogen storage control module analyzes and calculates the power demand, sends an instruction to preferentially absorb power by the short-time energy storage system until the power grid frequency approaches the power grid rated frequency f 0 Or short-time energy storage system power storage
Figure 204008DEST_PATH_IMAGE005
1= 100%; at this time:
if the stored energy of the energy storage system is long
Figure 633852DEST_PATH_IMAGE005
2 satisfies 0 ≤
Figure 609899DEST_PATH_IMAGE007
Less than or equal to 5 percent, and the hybrid energy storage system and the hydrogen production system do not work;
if the electricity storage capacity of the energy storage system is 5% <fora long time
Figure 353864DEST_PATH_IMAGE005
Figure 353864DEST_PATH_IMAGE005
2 is less than or equal to 100 percent, the long-term energy storage system discharges according to the requirement, and the discharge power = min { power required by a power grid dispatching AGC instruction-wind power, power which can be generated by a photovoltaic station, and the maximum discharge power of the long-term energy storage system } is carried out until the electricity storage quantity of the long-term energy storage system
Figure 997335DEST_PATH_IMAGE007
=0, the long-term energy storage system stops working; during which the hydrogen production system is not operating.
The hydrogen production system is connected with the purification and separation system, and the purification and separation system is used for purifying and separating hydrogen generated by the hydrogen production system so as to prevent impurities from poisoning hydrogen storage alloy of the hydrogen storage system and ensure safe and reliable storage of the hydrogen.
Wherein the purification and separation system is connected with the hydrogen storage system; when the hydrogen storage system stores hydrogen, the hydrogen storage alloy is used as a hydrogen storage medium, so that low-pressure and high-density storage of the hydrogen is realized.
When the hydrogen storage system stores hydrogen, the hydrogen storage alloy is used as a hydrogen storage medium, so that low-pressure and high-density storage of the hydrogen is realized; the hydrogen storage alloy is powder and the material is AB 5 、AB 2 、A 2 B one of hydrogen storage alloys; the hydrogen storage density reaches 1.5% -2.5%, the hydrogen storage pressure is not higher than 1MPa, and the hydrogen purity is high and is higher than 99.999%.
Different from the prior art, the hybrid energy storage and hydrogen storage device for the new energy station provided by the invention has the advantages that the hybrid energy storage system and the hydrogen production system, which are composed of the wind power system, the photovoltaic power generation system and the long-time and short-time energy storage systems, are connected into the same alternating current power grid, and the electric energy generated by the wind power system and the photovoltaic power generation system is selectively charged into the hybrid energy storage system or applied to the hydrogen production system to generate hydrogen energy for storage under the control of the energy storage and hydrogen storage control module. According to the invention, on one hand, the short-time energy storage system is utilized to optimize the power grid frequency and stabilize the fluctuation of new energy, and on the other hand, the energy storage system can provide long-time energy storage guarantee and shift peaks and fill valleys by utilizing more than 1 hour; during the peak period of power generation, hydrogen is generated by methods of hydrogen production by water electrolysis and the like and is stored in a hydrogen storage alloy hydrogen storage system, thereby reducing wind and light abandonment and promoting new energy consumption.
Drawings
The invention and/or additional aspects and advantages will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a hybrid energy-storing and hydrogen-storing device for a new energy station provided by the invention.
Fig. 2 is a schematic exploded view of a hybrid energy-storing and hydrogen-storing device for a new energy station according to the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Fig. 1 is a hybrid energy and hydrogen storage device for a new energy station according to an embodiment of the present invention. The method comprises the following steps: one end of the first parallel branch 1 is connected to a power generation system 5 of the new energy station, and the other end of the first parallel branch 1 is connected to an alternating current power grid 4;
one end of the second parallel branch 2 is connected with the long-time and/or short-time energy storage system, and the other end of the second parallel branch 2 is connected with the alternating current power grid 4;
one end of the third parallel branch 3 is connected with a hydrogen production system 7, and the other end of the third parallel branch 3 is connected with an alternating current power grid 4;
and the energy storage and hydrogen storage control module 10 is used for controlling the long-term and short-term energy storage system to charge and discharge energy and controlling the hydrogen production system 7 to produce hydrogen according to the real-time power generation state of the power generation system 5 and the real-time power utilization state of the alternating current power grid 4.
According to the International Energy Agency (IEA), four stages are divided according to the proportion of the power grid absorbing intermittent renewable energy (mainly wind power and photovoltaic):
(1) the first stage is as follows: the intermittent renewable energy content is less than 3%, and the fluctuation of the power demand per se exceeds the fluctuation range of the intermittent renewable power supply, so that the operation of the power grid is basically not influenced.
(2) And a second stage: the intermittent renewable energy accounts for 3% -15%, the impact on a power grid is small, the fluctuation and the intermittence of the renewable energy can be stabilized by predicting the power generation of the intermittent renewable energy unit and enhancing the dispatching mode, and the renewable energy is easy to absorb.
(3) And a third stage: the intermittent renewable energy accounts for 15-25%, the impact on the power grid is large, the flexibility requirement of the power grid is greatly increased, a frequency modulation power station needs to be added in a short term, and the application of demand side management and energy storage technology needs to be introduced in a medium-long term.
(4) A fourth stage: the proportion of intermittent renewable energy sources is between 25% and 50%, the stability of a power grid faces challenges, 100% of power is provided by the intermittent renewable energy sources in a part of time period, and all power plants must be configured with energy storage to operate flexibly so as to cope with random changes of power supply ends and load ends.
Under the big background that intermittent type nature renewable energy power generation ratio constantly promoted, the configuration energy storage not only can reduce and abandon wind and abandon the optical rate through the quick storage and the release to the electric energy, and more important effect can stabilize new forms of energy fluctuation, tracks the plan and exports power to participate in the system peak regulation frequency modulation, strengthen the stability of electric wire netting.
As shown in fig. 2, the first parallel branch 1 includes a first transformer 11 and a first converter 12, one end of the first transformer 11 is connected to one end of the first converter 12, the other end of the first transformer 11 is connected to the ac power grid 4, and the other end of the first converter 12 is connected to the power generation system 5; the power generation system 5 is a wind power system and/or a photovoltaic power generation system of the new energy station, and when the wind power system and the photovoltaic power generation system exist simultaneously, the wind power system and the photovoltaic power generation system are connected with the alternating current power grid 4 through a first parallel branch 1. The wind power and photovoltaic system of the power generation system 5 receives wind energy and solar energy, converts the wind energy and the solar energy into electric energy, and after the electric energy is subjected to variable current conversion and is boosted to a voltage level of 10kV or 35kV, the electric energy is merged into the alternating current power grid 4.
The second parallel branch 2 comprises a second converter 22, one end of the second converter 22 is connected with a long-time and/or short-time energy storage system, the other end of the second converter 22 is connected with an energy and hydrogen storage control module 10, and the energy and hydrogen storage control module 10 is connected to the alternating current power grid 4 through a second transformer 21; the alternating current power grid is a 10kV or 350kV alternating current power grid.
The short-time energy storage system comprises at least one of flywheel energy storage, a super capacitor and superconducting energy storage, and the continuous charging and discharging time is not more than 15 minutes; the long-term energy storage system comprises at least one of a lithium battery, a lead-acid battery, a sodium-sulfur battery, a flow battery, compressed air energy storage and pumped storage, and the continuous charging and discharging time is not less than 1 hour; when the short-term energy storage system and the long-term energy storage system exist at the same time, a hybrid energy storage system 6 is formed.
In the third parallel branch 3, the hydrogen production system 7 is connected to the ac power grid 4 through the energy storage and hydrogen storage control module 10 and the second transformer 21.
Wherein, when the short-time energy storage system is a flywheel energy storage system, the rotation energy of the flywheel is
Figure 332501DEST_PATH_IMAGE001
Wherein J is the moment of inertia of the flywheel rotor,
Figure 999106DEST_PATH_IMAGE002
is the rotor angular velocity; for a rotor with a uniform mass distribution,
Figure 77920DEST_PATH_IMAGE003
wherein R is the radius of the rotor, and n is the rotating speed of the rotor;
the rotating speed of the rotor when the flywheel is fully charged is n in the running process max The rotor speed in standby is n min Then, then
The energy storage capacity of the flywheel energy storage system is represented as:
Figure 575898DEST_PATH_IMAGE004
except for faults or other abnormal conditions, the flywheel energy storage system always works between standby and the highest rotating speed, and the standby rotating speed is the lowest rotating speed n min The flywheel energy storage system can be in an empty state by using electric quantity, and can not discharge outwards any more and only charge at the rotating speed. Maximum speed n max The flywheel energy storage system is in a fully charged state, and the flywheel energy storage system can only discharge outwards and cannot be charged at the rotating speed.
Wherein, the energy-storing and hydrogen-storing control module 10 is used for controlling the power consumption of the AC power grid,
the energy storage and hydrogen storage control module 10 acquires the frequency of the grid-connected AC power grid according to the real-time power utilization state of the AC power grid 4, judges whether the frequency is in the primary frequency modulation dead zone range of the new energy station, and sets the dead zone range to be-f according to the power grid requirement DB ≤f≤f DB Rated frequency f of the grid 0 ；
At the peak of power generation, if the power required by the power grid dispatching AGC instruction is less than the power generated by the wind power station and the photovoltaic station, the power generated by the wind power station and the photovoltaic station can generate excessive electric energy, so that a part of electric energy can not be on line, and the phenomenon of power limitation exists, at the moment:
(1) if the frequency of the AC mains is-f DB ≤f≤f DB And f < -f DB In the meantime, the hybrid energy storage system 6 does not perform power grid frequency optimization adjustment, and executes the following strategy:
if in the hybrid energy storage system 6, the short-time energy storage system stores the electric quantity
Figure 19648DEST_PATH_IMAGE005
1 and long-term energy storage system
Figure 235866DEST_PATH_IMAGE005
Figure 235866DEST_PATH_IMAGE005
2 satisfies the condition that 95 percent is less than or equal to
Figure 118371DEST_PATH_IMAGE006
Less than or equal to 100 percent and less than or equal to 95 percent
Figure 408539DEST_PATH_IMAGE007
The hybrid energy storage system 6 does not work when the hydrogen production system is less than or equal to 100 percent, and the hydrogen production system 7 starts to work to produce hydrogen;
if the short-time energy storage system stores the electric quantity
Figure 351087DEST_PATH_IMAGE005
1 and long-term energy storage system
Figure 461125DEST_PATH_IMAGE005
Figure 461125DEST_PATH_IMAGE005
2 satisfies 0 ≤
Figure 881742DEST_PATH_IMAGE005
1 is less than 95 percent and is more than or equal to 95 percent
Figure 354312DEST_PATH_IMAGE007
If the charging power is less than or equal to 100%, the short-time energy storage system starts to charge according to the requirement, and the charging power = min { power generation of a wind power station, power required by a power grid dispatching AGC instruction, maximum charging power of the short-time energy storage system };
if the short-time energy storage system stores the electric quantity
Figure 405445DEST_PATH_IMAGE005
1 and long-term energy storage system
Figure 330675DEST_PATH_IMAGE005
Figure 330675DEST_PATH_IMAGE005
2 satisfies 0 ≤
Figure 554983DEST_PATH_IMAGE005
2 is less than 95 percent and is less than or equal to 95 percent
Figure 819742DEST_PATH_IMAGE006
The charging power is = min { power generation of wind power and photovoltaic stations-power required by a power grid dispatching AGC instruction, maximum charging power of the long-term energy storage system };
if the short-time energy storage system stores the electric quantity
Figure 104093DEST_PATH_IMAGE005
1 and long-term energy storage system
Figure 516620DEST_PATH_IMAGE005
Figure 516620DEST_PATH_IMAGE005
2 satisfies 0 ≤
Figure 951144DEST_PATH_IMAGE005
1 is less than 95 percent and less than or equal to 0
Figure 132726DEST_PATH_IMAGE005
When the charging power is less than 2% and less than 95%, the short-time energy storage system starts charging preferentially, and the charging power = min { power generation of a wind power station, power required by a power grid dispatching AGC instruction, and maximum charging power of the short-time energy storage system };
when the short-time energy storage system stores the electric quantity
Figure 587978DEST_PATH_IMAGE005
When the charging power is 1=100%, the long-term energy storage system starts to be charged according to the requirement, and the charging power = min { power generated by a wind power station, a photovoltaic station-power generation-power required by a power grid dispatching AGC instruction, and the maximum charging power of the long-term energy storage system };
when the short-time energy storage system stores the electric quantity
Figure 691063DEST_PATH_IMAGE005
1=100% long-term energy storage system power storage
Figure 257174DEST_PATH_IMAGE005
After 2=100%, the hydrogen production system 7 starts to operate to produce hydrogen;
(2) if the grid frequency f > f DB During the process, the hybrid energy storage system 6 preferentially carries out power grid frequency optimization adjustment, the energy storage and hydrogen storage control module 10 analyzes and calculates the power demand, and sends an instruction to preferentially absorb power by the short-time energy storage system until the power grid frequency approaches the power grid rated frequency f 0 Or short-time energy storage system power storage
Figure 293263DEST_PATH_IMAGE008
1= 100%; at this time:
if the stored energy of the energy storage system is long
Figure 857100DEST_PATH_IMAGE005
2 satisfies 0 ≤
Figure 244219DEST_PATH_IMAGE007
Less than or equal to 5 percent, and the long-term energy storage system does not work;
if the electricity storage capacity of the energy storage system is 5% <fora long time
Figure 286124DEST_PATH_IMAGE007
The charging power is less than or equal to 100%, the long-term energy storage system is charged as required, and the charging power is = min { power generation of a wind power station and a photovoltaic station-power required by a power grid dispatching AGC instruction, and the maximum charging power of the long-term energy storage system };
when long term energy storage system electric quantity
Figure 442299DEST_PATH_IMAGE007
After =100%, the hydrogen production system 7 starts to operate to produce hydrogen;
if the power required by the power grid dispatching AGC instruction = the wind power and the power generation of the photovoltaic station, the wind power and the photovoltaic station can generate power according to the power generation, and the phenomena of wind abandon and light abandon do not exist, and at the moment, the hybrid energy storage system 6 and the hydrogen production system 7 do not work;
if the power required by the power grid dispatching AGC instruction is larger than the power which can be generated by the wind power station and the photovoltaic station, the wind power station and the photovoltaic station can generate power according to the generated power, the phenomena of wind abandoning and light abandoning do not exist, and a certain power generation internet space also exists, at the moment:
(1) if the frequency of the network-f DB ≤f≤f DB The hybrid energy storage system 6 does not perform grid frequency optimization adjustment, and executes the following strategy:
if the stored energy of the energy storage system is long
Figure 239354DEST_PATH_IMAGE005
2 satisfies 0 ≤
Figure 785873DEST_PATH_IMAGE007
Less than or equal to 5 percent, and the hybrid energy storage system 6 and the hydrogen production system 7 do not work;
if the electricity storage capacity of the energy storage system is 5% <fora long time
Figure 959365DEST_PATH_IMAGE007
Less than or equal to 100%, discharging the long-term energy storage system as required, wherein the discharging power = min { power-wind power, power generation of a photovoltaic station, maximum discharging power of the long-term energy storage system, required by a power grid dispatching AGC instruction }, until the electricity storage quantity of the long-term energy storage system is up
Figure 970046DEST_PATH_IMAGE007
=0, the long-term energy storage system stops working; during which the hydrogen production system 7 is not operating;
(2) if the grid frequency f < -f DB The hybrid energy storage system 6 preferentially carries out power grid frequency optimization adjustment, the energy storage and hydrogen storage control module 10 analyzes and calculates power demand, and sends an instruction to preferentially output power by the short-time energy storage system until the power grid frequency approaches to the power grid rated frequency f 0 Or short-time energy storage system power storage
Figure 610106DEST_PATH_IMAGE005
1= 0; at this time:
if the stored energy of the energy storage system is long
Figure 706238DEST_PATH_IMAGE005
2 satisfies 0 ≤
Figure 152263DEST_PATH_IMAGE007
Less than or equal to 5 percent, and the hybrid energy storage system 6 and the hydrogen production system 7 do not work;
if the electricity storage capacity of the long-term energy storage system is 5% <
Figure 486292DEST_PATH_IMAGE007
Less than or equal to 100%, discharging the long-term energy storage system as required, wherein the discharging power = min { power-wind power, power generation of a photovoltaic station, maximum discharging power of the long-term energy storage system, required by a power grid dispatching AGC instruction }, until the electricity storage quantity of the long-term energy storage system is up
Figure 625150DEST_PATH_IMAGE007
=0, the long-term energy storage system stops working; during which the hydrogen production system 7 is not operating;
(3) if the grid frequency f > f DB The hybrid energy storage system 6 preferentially carries out power grid frequency optimization adjustment, the energy storage and hydrogen storage control module 10 analyzes and calculates power demand, and sends an instruction to preferentially absorb power by the short-time energy storage system until the power grid frequency approaches to the power grid rated frequency f 0 Or short-time energy storage system power storage
Figure 208578DEST_PATH_IMAGE005
1= 100%; at this time:
if the stored energy of the energy storage system is long
Figure 395977DEST_PATH_IMAGE007
Satisfies the condition that the concentration is less than or equal to 0
Figure 381250DEST_PATH_IMAGE007
Less than or equal to 5 percent, and the hybrid energy storage system 6 and the hydrogen production system 7 do not work;
if the electricity storage capacity of the energy storage system is 5% <fora long time
Figure 363113DEST_PATH_IMAGE007
Less than or equal to 100%, discharging the long-term energy storage system as required, wherein the discharging power = min { power-wind power, power generation of a photovoltaic station, maximum discharging power of the long-term energy storage system, required by a power grid dispatching AGC instruction }, until the electricity storage quantity of the long-term energy storage system is up
Figure 433837DEST_PATH_IMAGE007
=0, the long-term energy storage system stops working; during which the hydrogen production system 7 is not operating.
The hydrogen production system is connected with the purification and separation system, and the purification and separation system is used for purifying and separating hydrogen generated by the hydrogen production system so as to prevent impurities from poisoning hydrogen storage alloy of the hydrogen storage system and ensure safe and reliable storage of the hydrogen.
Wherein the purification and separation system is connected with the hydrogen storage system; when the hydrogen storage system stores hydrogen, the hydrogen storage alloy is used as a hydrogen storage medium, so that low-pressure and high-density storage of the hydrogen is realized.
When the hydrogen storage system stores hydrogen, the hydrogen storage alloy is used as a hydrogen storage medium, so that low-pressure and high-density storage of the hydrogen is realized; the hydrogen storage alloy is powder and the material is AB 5 、AB 2 、A 2 B one of hydrogen storage alloys; the hydrogen storage density reaches 1.5% -2.5%, the hydrogen storage pressure is not higher than 1MPa, and the hydrogen purity is high and is higher than 99.999%.
Different from the prior art, the hybrid energy storage and hydrogen storage device for the new energy station provided by the invention has the advantages that the hybrid energy storage system and the hydrogen production system, which are composed of the wind power system, the photovoltaic power generation system and the long-time and short-time energy storage systems, are connected into the same alternating current power grid, and the electric energy generated by the wind power system and the photovoltaic power generation system is selectively charged into the hybrid energy storage system or applied to the hydrogen production system to generate hydrogen energy for storage under the control of the energy storage and hydrogen storage control module. According to the invention, on one hand, the short-time energy storage system is utilized to optimize the power grid frequency and stabilize the fluctuation of new energy, and on the other hand, the energy storage system can provide long-time energy storage guarantee and shift peaks and fill valleys by utilizing more than 1 hour; during the peak period of power generation, hydrogen is generated by methods of hydrogen production by water electrolysis and the like and is stored in a hydrogen storage alloy hydrogen storage system, thereby reducing wind and light abandonment and promoting new energy consumption.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic representation of the terms does not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

Claims (10)

1. A hybrid energy and hydrogen storage device for a new energy station, comprising:
one end of the first parallel branch is connected to a power generation system of the new energy station, and the other end of the first parallel branch is connected to an alternating current power grid;
one end of the second parallel branch is connected with the long-time and/or short-time energy storage system, and the other end of the second parallel branch is connected to the alternating current power grid;
one end of the third parallel branch is connected with the hydrogen production system, and the other end of the third parallel branch is connected with the alternating current power grid;
and the energy storage and hydrogen storage control module is used for controlling the long-term and/or short-term energy storage system to charge and discharge energy and controlling the hydrogen production system to produce hydrogen according to the real-time power generation state of the power generation system and the real-time power utilization state of the alternating current power grid.
2. The hybrid energy and hydrogen storage device for the new energy station as claimed in claim 1, wherein the first parallel branch comprises a first transformer and a first converter, one end of the first transformer is connected with one end of the first converter, the other end of the first transformer is connected with an ac power grid, and the other end of the first converter is connected with a power generation system; the power generation system is a wind power system and/or a photovoltaic power generation system of the new energy station, and when the wind power system and the photovoltaic power generation system exist simultaneously, the wind power system and the photovoltaic power generation system are connected with the alternating current power grid through a first parallel branch.
3. The hybrid energy and hydrogen storage device for the new energy station as claimed in claim 1, wherein the second parallel branch comprises a second converter, one end of the second converter is connected to the long-term and/or short-term energy storage system, the other end of the second converter is connected to the energy and hydrogen storage control module, and the energy and hydrogen storage control module is connected to an ac power grid through a second transformer; the alternating current power grid is a 10kV or 350kV alternating current power grid.
4. The hybrid energy and hydrogen storage device for the new energy station according to claim 3, wherein the short-time energy storage system comprises at least one of flywheel energy storage, super capacitor and superconducting energy storage, and the charging and discharging time is not more than 15 minutes; the long-term energy storage system comprises at least one of a lithium battery, a lead-acid battery, a sodium-sulfur battery, a flow battery, compressed air energy storage and pumped storage, and the charge-discharge duration is not less than 1 hour; when the short-term energy storage system and the long-term energy storage system exist simultaneously, a hybrid energy storage system is formed.
5. The hybrid energy and hydrogen storage device for the new energy station as claimed in claim 1, wherein in the third parallel branch, the hydrogen production system is connected to the ac power grid through the energy and hydrogen storage control module and the second transformer.
6. The hybrid energy and hydrogen storage device for the new energy station as claimed in claim 4, wherein when the short-time energy storage system is a flywheel energy storage system, the rotation energy of the flywheel is
Figure 453304DEST_PATH_IMAGE001
Wherein J is the rotational inertia of the flywheel rotor,
Figure 308128DEST_PATH_IMAGE002
is the rotor angular velocity; for a rotor with a uniform mass distribution,
Figure 87865DEST_PATH_IMAGE003
wherein R is the radius of the rotor, and n is the rotating speed of the rotor;
the rotor speed is n when the flywheel is fully charged in the running process max The rotor speed in standby is n min Then, then
The energy storage capacity of the flywheel energy storage system is represented as:
Figure 483074DEST_PATH_IMAGE004
。
7. the hybrid energy and hydrogen storage device for the new energy station as claimed in claim 4, wherein the energy and hydrogen storage control module obtains the frequency of the AC power grid at the grid-connected point according to the real-time power utilization state of the AC power grid, and determines whether the frequency is within the dead zone range of the primary frequency modulation of the new energy station, and the dead zone range is set to-f according to the power grid requirement DB ≤f≤f DB Rated frequency f of the grid 0 ；
At the peak of power generation, if the power required by the power grid dispatching AGC instruction is less than the power generated by the wind power station and the photovoltaic station, the power generated by the wind power station and the photovoltaic station can generate excessive electric energy, so that a part of electric energy can not be on line, and the phenomenon of power limitation exists, at the moment:
(1) if the frequency of the AC mains is-f DB ≤f≤f DB And f < -f DB And then, the hybrid energy storage system does not carry out power grid frequency optimization and adjustment, and executes the following strategies:
if in the hybrid energy storage system, the short-time energy storage system stores the electric quantity
Figure 969551DEST_PATH_IMAGE005
1 and long-term energy storage system
Figure 792013DEST_PATH_IMAGE005
2 satisfies the condition that 95 percent is less than or equal to
Figure 262309DEST_PATH_IMAGE006
Less than or equal to 100 percent and less than or equal to 95 percent
Figure 461209DEST_PATH_IMAGE007
The hybrid energy storage system does not work when the hydrogen production system is less than or equal to 100 percent, and the hydrogen production system starts to work to produce hydrogen;
if the short-time energy storage system stores the electric quantity
Figure 67771DEST_PATH_IMAGE005
1 and long-term energy storage system
Figure 61134DEST_PATH_IMAGE005
2 satisfies 0 ≤
Figure 815464DEST_PATH_IMAGE005
1 is less than 95 percent and less than or equal to 95 percent
Figure 224580DEST_PATH_IMAGE007
If the charging power is less than or equal to 100%, the short-time energy storage system starts to charge according to the requirement, and the charging power = min { power generation of a wind power station, power required by a power grid dispatching AGC instruction, maximum charging power of the short-time energy storage system };
if the short-time energy storage system stores the electric quantity
Figure 747965DEST_PATH_IMAGE005
1 and longPower storage of time energy storage system
Figure 177809DEST_PATH_IMAGE005
2 satisfies 0 ≤
Figure 622697DEST_PATH_IMAGE005
2 is less than 95 percent and is less than or equal to 95 percent
Figure 897820DEST_PATH_IMAGE006
The charging power is = min { power generation of wind power and photovoltaic stations-power required by a power grid dispatching AGC instruction, maximum charging power of the long-term energy storage system };
if the short-time energy storage system stores the electric quantity
Figure 478975DEST_PATH_IMAGE005
1 and long-term energy storage system
Figure 814141DEST_PATH_IMAGE005
2 satisfies 0 ≤
Figure 543063DEST_PATH_IMAGE005
1 is less than 95 percent and less than or equal to 0
Figure 559560DEST_PATH_IMAGE005
When the charging power is less than 2% and less than 95%, the short-time energy storage system starts charging preferentially, and the charging power = min { power generation of a wind power station, power required by a power grid dispatching AGC instruction, and maximum charging power of the short-time energy storage system };
when the short-time energy storage system stores the electric quantity
Figure 57537DEST_PATH_IMAGE005
When the charging power is 1=100%, the long-term energy storage system starts to be charged according to the requirement, and the charging power = min { power generated by a wind power station, a photovoltaic station-power generation-power required by a power grid dispatching AGC instruction, and the maximum charging power of the long-term energy storage system };
when the short-time energy storage system stores the electric quantity
Figure 766868DEST_PATH_IMAGE005
1=100% long-term energy storage system power storage
Figure 717506DEST_PATH_IMAGE005
After 2=100%, the hydrogen production system starts to work to produce hydrogen;
(2) if the grid frequency f > f DB During the process, the hybrid energy storage system preferentially carries out power grid frequency optimization adjustment, the energy storage and hydrogen storage control module analyzes and calculates the power demand, and sends an instruction to preferentially absorb power by the short-time energy storage system until the power grid frequency approaches to the power grid rated frequency f 0 Or short-time energy storage system power storage
Figure 600011DEST_PATH_IMAGE008
1= 100%; at this time:
if the stored energy of the energy storage system is long
Figure 624599DEST_PATH_IMAGE005
2 satisfies 0 ≤
Figure 567147DEST_PATH_IMAGE007
Less than or equal to 5 percent, and the long-term energy storage system does not work;
if the electricity storage capacity of the energy storage system is 5% <fora long time
Figure 208344DEST_PATH_IMAGE005
2% or less than 100%, charging the long-term energy storage system as required, wherein the charging power = min { power generation of a wind power station, power generation of a photovoltaic station-power required by a power grid dispatching AGC instruction, maximum charging power of the long-term energy storage system };
when long term energy storage system electric quantity
Figure 628961DEST_PATH_IMAGE007
After the hydrogen production system is operated for generating hydrogen after the hydrogen production system is operated for 100 percent;
if the power required by the power grid dispatching AGC instruction = the wind power and the power generation of the photovoltaic station, the wind power and the photovoltaic station can generate power according to the power generation, and the phenomena of wind abandon and light abandon do not exist, and at the moment, the hybrid energy storage system and the hydrogen production system do not work;
if the power required by the power grid dispatching AGC instruction is larger than the power which can be generated by the wind power station and the photovoltaic station, the wind power station and the photovoltaic station can generate power according to the generated power, the phenomena of wind abandoning and light abandoning do not exist, and a certain power generation internet space also exists, at the moment:
(1) if the frequency of the network-f DB ≤f≤f DB And the hybrid energy storage system does not perform power grid frequency optimization adjustment, and executes the following strategies:
if the stored energy of the energy storage system is long
Figure 101531DEST_PATH_IMAGE005
2 satisfies 0 ≤
Figure 152664DEST_PATH_IMAGE007
Less than or equal to 5 percent, and the hybrid energy storage system and the hydrogen production system do not work;
if the electricity storage capacity of the energy storage system is 5% <fora long time
Figure 77894DEST_PATH_IMAGE005
2 is less than or equal to 100 percent, the long-term energy storage system discharges according to the requirement, and the discharge power = min { power required by a power grid dispatching AGC instruction-wind power, power which can be generated by a photovoltaic station, and the maximum discharge power of the long-term energy storage system } is carried out until the electricity storage quantity of the long-term energy storage system
Figure 302202DEST_PATH_IMAGE007
=0, the long-term energy storage system stops working; during which the hydrogen production system is not operating;
(2) if the grid frequency f < -f DB The hybrid energy storage system preferentially carries out power grid frequency optimization adjustment, the energy storage and hydrogen storage control module analyzes and calculates power demand, and sends an instruction to preferentially output power by the short-time energy storage system until the power grid frequency approaches to the power grid rated frequency f 0 Or short-time energy storage system power storage
Figure 24084DEST_PATH_IMAGE005
1= 0; at this time:
if the stored energy of the energy storage system is long
Figure 308435DEST_PATH_IMAGE005
2 satisfies 0 ≤
Figure 924224DEST_PATH_IMAGE007
Less than or equal to 5 percent, and the hybrid energy storage system and the hydrogen production system do not work;
if the electricity storage capacity of the energy storage system is 5% <fora long time
Figure 952223DEST_PATH_IMAGE005
2 is less than or equal to 100 percent, the long-term energy storage system discharges according to the requirement, and the discharge power = min { power required by a power grid dispatching AGC instruction-wind power, power which can be generated by a photovoltaic station, and the maximum discharge power of the long-term energy storage system } is carried out until the electricity storage quantity of the long-term energy storage system
Figure 133806DEST_PATH_IMAGE007
=0, the long-term energy storage system stops working; during which the hydrogen production system is not operating;
(3) if the grid frequency f > f DB The hybrid energy storage system preferentially carries out power grid frequency optimization adjustment, the energy storage and hydrogen storage control module analyzes and calculates power demand, and sends an instruction to preferentially absorb power by the short-time energy storage system until the power grid frequency approaches to the power grid rated frequency f 0 Or short-time energy storage system power storage
Figure 261162DEST_PATH_IMAGE005
1= 100%; at this time:
if the stored energy quantity of the energy storage system is long
Figure 160985DEST_PATH_IMAGE005
2 satisfies 0 ≤
Figure 727095DEST_PATH_IMAGE007
Less than or equal to 5 percent and mixingThe energy storage system and the hydrogen production system do not work;
if the electricity storage capacity of the energy storage system is 5% <fora long time
Figure 966447DEST_PATH_IMAGE007
Less than or equal to 100%, discharging the long-term energy storage system as required, wherein the discharging power = min { power-wind power, power generation of a photovoltaic station, maximum discharging power of the long-term energy storage system, required by a power grid dispatching AGC instruction }, until the electricity storage quantity of the long-term energy storage system is up
Figure 327021DEST_PATH_IMAGE007
=0, the long-term energy storage system stops working; during which the hydrogen production system is not operating.
8. The hybrid energy and hydrogen storage device for the new energy station as claimed in claim 5, wherein the hydrogen production system is connected to a purification and separation system, and the purification and separation system is used for purifying and separating hydrogen generated by the hydrogen production system, so as to prevent impurities from poisoning hydrogen storage alloy of the hydrogen storage system and ensure safe and reliable storage of the hydrogen.
9. The hybrid energy and hydrogen storage device for the new energy station as claimed in claim 8, wherein the purification and separation system is connected to a hydrogen storage system; when the hydrogen storage system stores hydrogen, the hydrogen storage alloy is used as a hydrogen storage medium, so that low-pressure and high-density storage of the hydrogen is realized.
10. The hybrid energy and hydrogen storage device for new energy stations of claim 9, wherein the hydrogen storage alloy is in powder form and the material is AB 5 、AB 2 、A 2 B one of hydrogen storage alloys; the hydrogen storage density reaches 1.5% -2.5%, the hydrogen storage pressure is not higher than 1MPa, and the hydrogen purity is high and is higher than 99.999%.
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