CN113315243B - Flywheel energy storage and hydrogen storage charging and discharging control method for new energy micro-grid - Google Patents
Flywheel energy storage and hydrogen storage charging and discharging control method for new energy micro-grid Download PDFInfo
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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
- 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
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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
- H02J15/00—Systems for storing electric energy
- H02J15/008—Systems for storing electric energy using hydrogen as energy vector
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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
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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
- H02J3/30—Arrangements for balancing of the load in a network by storage of energy using dynamo-electric machines coupled to flywheels
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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
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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- 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
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- 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
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
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- 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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Abstract
The invention relates to a flywheel energy storage and hydrogen storage charging and discharging control method for a new energy microgrid, and belongs to the technical field of new energy. Due to randomness and uncertainty of wind power and photovoltaic output, electric energy generated by the new energy has certain fluctuation, and the output power of new energy power generation is smoothed by using an energy storage device in a microgrid. Based on a flywheel energy storage and hydrogen storage charging and discharging control method, a hybrid storage system is adopted for energy storage, and different conditions of new energy power generation can be processed, so that the output power of the smooth new energy power generation is realized. The invention can combine the advantages of different energy storages, avoid the defects of different types of energy storages in charge and discharge control, simultaneously consider the coordination and coordination problems among different technologies, and can be suitable for the operation control of the new energy microgrid.
Description
Technical Field
The invention belongs to the technical field of new energy, and relates to a flywheel energy storage and hydrogen storage charging and discharging control method for a new energy microgrid.
Background
Due to randomness and uncertainty of wind power and photovoltaic output, electric energy generated by new energy has certain volatility. When large-scale new energy is merged into a power grid, the electric energy of the power grid is polluted, and an energy storage device can be connected into the new energy power station for smoothing the output power of the new energy power station. In a new energy microgrid, energy storage plays a vital role and can meet the requirements for extra capacity and flexibility. Energy storage mainly undertakes two important tasks in the new energy microgrid: long term storage to extend storage capacity; short term storage to cope with power peaks. Thus, multiple modes of operation are required to address these two different needs simultaneously.
The hybrid storage system is able to combine the advantages of different energy storage while avoiding the disadvantages of different types of energy storage. Hydrogen is a reliable storage medium, has extremely low self-discharge rate, can carry out electrolysis and hydrogen's regeneration in same equipment through reversible solid oxide battery, and to its working characteristic, reversible solid oxide battery's load following ability is relatively poor, needs an energy storage technique that can provide the regulation in the short time to mix the energy storage, and flywheel energy storage has great capacity density and power density, and the maintenance cycle is long, and system stability is strong, is applicable to peak regulation frequency modulation, and the electric energy quality adjusts. Therefore, the research provides a charging and discharging control method for mixing hydrogen storage with flywheel energy storage, solves the technical problem of how to comprehensively control flywheel energy storage and hydrogen storage charging and discharging, considers the coordination and coordination problems among different technologies, and can be suitable for operation control of a new energy microgrid.
Disclosure of Invention
In view of this, the present invention provides a flywheel energy storage and hydrogen storage charging and discharging control method for a new energy microgrid.
In order to achieve the purpose, the invention provides the following technical scheme:
a flywheel energy storage and hydrogen storage charging and discharging control method for a new energy micro-grid comprises the following steps:
classifying the photovoltaic power generation conditions in the new energy, wherein the photovoltaic power generation conditions comprise two conditions of excessive power generation and insufficient power generation;
when photovoltaic power generation in the new energy is excessive;
case 1: w is more than or equal to w up Now, the rotation speed of the flywheel reaches the upper limit value w up It cannot be charged;
in case 1, when hydrogen storage is inoperable, the hydrogen tank is full and the large-capacity storage cannot be charged by electrolysis, or the reversible solid oxide cell cannot be operated as a fuel cell; injecting the surplus energy of photovoltaic power generation into a microgrid, wherein the expression is shown as follows;
E grid ＝ΔE
in the formula, E grid Representing the energy flowing out or in from the microgrid, Δ E representing the difference between the photovoltaic output energy and the energy required by the load;
case 2: w is less than w up The flywheel energy storage can store energy;
under the condition 2, when hydrogen storage cannot work, the flywheel stores energy to absorb surplus energy of photovoltaic power generation, and the energy exceeding the energy storage capacity of the flywheel flows into a power grid, wherein the expression is shown as follows;
E grid ＝ΔE-E smooth
case 3: w > w lp The flywheel energy storage can release energy;
in case 3, when hydrogen storage is inoperable, the reversible solid oxide cell cannot operate in fuel cell mode, the flywheel stores energy and decelerates until it reaches its capacity limit; if the energy provided by the flywheel energy storage is insufficient, the micro-grid provides the rest part, and the expression is as follows;
E grid ＝|ΔE|-E smooth
case 4: w is less than or equal to w lp Now, the rotation speed of the flywheel has reached the lower limit value w lp Energy release cannot be performed;
under the condition 4, when the hydrogen storage can not work, the flywheel is under the operable rotating speed, and the load requirement is met through the microgrid, wherein the expression is as follows;
E grid ＝|ΔE|-E soe 。
optionally, in case 1, the hydrogen storage is performed in an energy storage mode, and the photovoltaic surplus energy can be stored in the hydrogen tank by electrolysis: the demand of hydrogen storage is less than the energy exceeding the photovoltaic power generation, the energy required by electrolysis is output from the photovoltaic power generation, and the residual energy exceeding the electrolysis demand can be injected into a power grid; the demand of hydrogen storage is greater than the energy exceeding the photovoltaic power generation, the whole exceeding energy can be stored in a hydrogen storage tank, and the flywheel releases energy to the reversible solid oxide cell according to the rotating speed condition of the flywheel, so that the power of the photovoltaic output is smoother, and the expression is shown in the specification;
E grid ＝ΔE-E soe
E grid ＝E soe -ΔE-E smooth
in the formula, E soe Represents the energy required for electrolysis, E smooth Representing the energy of the flywheel stored energy smoothing system.
Optionally, in the case 1, the energy storage is performed in an energy release working mode, and the energy injected into the power grid is equal to the excess energy of the photovoltaic power generation and the energy released by the hydrogen storage, and the expression is shown as follows;
E grid ＝ΔE+E sof
in the formula, E sof Representing the energy released by the hydrogen storage.
Optionally, in case 2, the hydrogen storage is performed in an energy storage mode, and the photovoltaic excess energy stores hydrogen for the hydrogen tank through electrolysis: the energy exceeding the energy storage capacity of the hydrogen storage can be absorbed by the energy storage of the flywheel, and if the maximum capacity of the flywheel is reached, the energy is injected into a power grid; if the energy exceeding the photovoltaic power generation does not meet the requirement of hydrogen storage, in order to fill the gap, the flywheel transmits the energy to the hydrogen storage through deceleration, and when the energy release of the flywheel reaches the maximum limit, the flywheel can also absorb the energy from the power grid, and the expression is shown in the specification;
E grid ＝ΔE-E soe -E smooth
E grid ＝E soe -ΔE-E smooth 。
optionally, in case 2, the energy storage is performed in an energy release mode, the energy injected into the power grid is equal to the excess energy of the photovoltaic power generation and the energy released by the hydrogen storage, and the energy absorbed by the flywheel is subtracted, wherein the expression is shown as follows;
E grid ＝ΔE+E sof -E smooth
photovoltaic power generation in new energy is insufficient.
Optionally, in the case 3, the hydrogen storage is performed in an energy storage working mode, when the reversible solid oxide battery is electrolyzed, the flywheel stores energy and releases energy according to a given power curve, and only when the maximum power of the flywheel generator is reached, the energy is absorbed from the microgrid, and the expression is shown as follows;
E grid ＝|ΔE|+E soe -E smooth 。
optionally, in the case 3, the hydrogen storage is in an energy release mode, the energy released by the hydrogen storage is greater than the required energy, the rest part is used for accelerating the flywheel, and when the maximum rotation speed of the flywheel is reached, the flywheel is injected into the microgrid; the energy released by the stored hydrogen is less than the required energy, the flywheel stores energy and decelerates until reaching the capacity limit, if the energy provided by the flywheel stored energy and the stored hydrogen is insufficient, the micro-grid provides the rest part, and the expression is as follows;
E grid ＝E sof -|ΔE|-E smooth
E grid ＝|ΔE|-E sof -E smooth 。
optionally, in case 4, hydrogen storage is performed in an energy storage working mode, and flywheel energy storage cannot reduce the energy burden introduced by electrolysis; the energy required by the reversible solid oxide battery in electrolysis is satisfied by the micro-grid, the flywheel keeps idling until the flywheel is completely decelerated due to the influence of kinetic energy loss, and the expression is shown in the specification;
E grid ＝|ΔE|。
optionally, in the case 4, the hydrogen storage is in an energy release working mode, the energy released by the hydrogen storage is greater than the required energy, the rest part is used for accelerating the flywheel, and when the maximum rotation speed of the flywheel is reached, the flywheel is injected into the microgrid; the energy released by hydrogen storage is less than the required energy, and the energy balance is carried out through a microgrid, wherein the expression is shown as follows;
E grid ＝|ΔE|-E sof -E smooth
E grid ＝|ΔE|-E sof 。
the invention has the beneficial effects that:
1. the invention adopts the energy storage device, can solve the problems of power fluctuation, energy waste and the like caused by high-proportion renewable energy in the micro-grid, and realizes the flexible and safe operation of the renewable energy in the micro-grid.
2. The invention adopts a flywheel energy storage and hydrogen storage hybrid energy storage system, can combine the advantages of different energy storage, and has the advantages of small environmental pollution, long-period energy storage, low energy storage cost and the like.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic diagram of the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Referring to fig. 1, in order to solve the problem caused by the new energy power generation in the micro-grid, the present invention provides a flywheel energy storage and hydrogen storage charging and discharging control method for a new energy micro-grid, which includes the following steps:
the method comprises the following steps that firstly, the photovoltaic power generation conditions in new energy are required to be classified, and the classification mainly comprises two conditions: excess and deficiency of power generation;
when photovoltaic power generation in the new energy is excessive;
case 1: w is more than or equal to w up When the rotation speed of the flywheel reaches the upper limit value w up It cannot be charged;
further, in case 1, when hydrogen storage is not available, either the hydrogen tank is full and the large-capacity storage cannot be charged by electrolysis, or the reversible solid oxide cell cannot be operated as a fuel cell. Therefore, the surplus energy of photovoltaic power generation can be injected into the microgrid, and the expression is shown as follows;
E grid ＝ΔE
in the formula, E grid Representing the energy flowing out or in from the microgrid, Δ E representing the difference between the photovoltaic output energy and the energy required by the load;
further, under case 1, the hydrogen storage is performed in an energy storage working mode, and the photovoltaic surplus energy can be stored in the hydrogen tank by electrolysis: the demand of hydrogen storage is less than the energy exceeding the photovoltaic power generation, the energy required by electrolysis is output from the photovoltaic power generation, and the residual energy exceeding the electrolysis demand can be injected into a power grid; the demand of hydrogen storage is greater than the energy exceeding the photovoltaic power generation, the whole exceeding energy can be stored in the hydrogen storage tank, and at the moment, the flywheel can release energy to the reversible solid oxide cell according to the rotating speed condition of the flywheel, so that the power of the photovoltaic output is smoother, and the expression is shown in the specification;
E grid ＝ΔE-E soe
E grid ＝E soe -ΔE-E smooth
in the formula, E soe Represents the energy required for electrolysis, E smooth Representing the energy of a flywheel energy storage smoothing system;
further, in case 1, the hydrogen storage is in an energy release working mode, and the energy injected into the power grid is equal to the excess energy of the photovoltaic power generation and the energy released by the hydrogen storage, and the expression is shown as follows;
E grid ＝ΔE+E sof
in the formula, E sof Energy representing hydrogen storage release;
case 2: w is less than w up The flywheel energy storage can store energy;
further, in case 2, when hydrogen storage cannot work, the flywheel stores energy to absorb excess energy of photovoltaic power generation, and the energy exceeding the flywheel energy storage capacity flows into a power grid, and the expression is shown in the specification;
E grid ＝ΔE-E smooth
further, under case 2, the hydrogen storage is performed in an energy storage working mode, and the photovoltaic surplus energy can be stored in the hydrogen tank by electrolysis: the energy exceeding the energy storage capacity of the hydrogen storage can be absorbed by the energy storage of the flywheel, and if the maximum capacity of the flywheel is reached, the energy is injected into a power grid; if the energy exceeding the photovoltaic power generation does not meet the requirement of hydrogen storage, in order to fill the gap, the flywheel transfers the energy to the hydrogen storage through deceleration, and when the energy release of the flywheel reaches the maximum limit, the flywheel can also absorb the energy from the power grid, and the expression is shown as follows;
E grid ＝ΔE-E soe -E smooth
E grid ＝E soe -ΔE-E smooth
further, in case 2, the energy storage is performed in an energy release working mode, the energy injected into the power grid is equal to the excess energy of the photovoltaic power generation and the energy released by the hydrogen storage, and the energy absorbed by the energy storage of the flywheel is subtracted, wherein the expression is shown as follows;
E grid ＝ΔE+E sof -E smooth
photovoltaic power generation in new energy is insufficient;
case 3: w > w lp The flywheel energy storage can release energy;
further, in case 3, when hydrogen storage is not operational, the reversible solid oxide cell cannot be operated in fuel cell mode, and the flywheel stores energy that decelerates until it reaches its capacity limit. If the energy provided by the flywheel energy storage is insufficient, the micro-grid provides the rest part, and the expression is as follows;
E grid ＝|ΔE|-E smooth
further, under the condition 3, hydrogen storage is carried out to store energy, when the reversible solid oxide battery is electrolyzed, flywheel energy storage is carried out to release energy according to a given power curve, and only when the maximum power of the flywheel generator is reached, the energy can be absorbed from the micro-grid, wherein the expression is shown as follows;
E grid ＝|ΔE|+E soe -E smooth
further, under the condition 3, the hydrogen storage is in an energy release working mode, the energy released by the hydrogen storage is larger than the required energy, the rest part is used for accelerating the flywheel, and when the maximum rotating speed of the flywheel is reached, the flywheel is injected into the micro-grid; the energy released by the stored hydrogen is less than the required energy, the flywheel stores energy and decelerates until reaching the capacity limit, if the energy provided by the flywheel stored energy and the stored hydrogen is insufficient, the micro-grid provides the rest part, and the expression is as follows;
E grid ＝E sof -|ΔE|-E smooth
E grid ＝|ΔE|-E sof -E smooth
case 4: w is less than or equal to w lp Now, the rotation speed of the flywheel has reached the lower limit value w lp Energy release cannot be performed;
further, in case 4, when hydrogen storage is not available, the load demand is met only by the microgrid due to the flywheel being below the operable speed, which is expressed as;
E grid ＝|ΔE|-E soe
further, in case 4, hydrogen storage is used for the energy storage mode, and flywheel energy storage cannot reduce the energy burden introduced by electrolysis. For this reason, the energy required by the reversible solid oxide cell in electrolysis is only satisfied by the microgrid, and the flywheel is kept idling until the reversible solid oxide cell is completely decelerated due to the influence of kinetic energy loss, and the expression is shown in the specification;
E grid ＝|ΔE|
further, under the condition 4, the hydrogen storage is in an energy release working mode, the energy released by the hydrogen storage is larger than the required energy, the rest part is used for accelerating the flywheel, and when the maximum rotating speed of the flywheel is reached, the flywheel is injected into the micro-grid; the energy released by hydrogen storage is less than the required energy, and the energy can only be balanced through a microgrid, and the expression is shown as follows;
E grid ＝|ΔE|-E sof -E smooth
E grid ＝|ΔE|-E sof
finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (9)
1. A flywheel energy storage and hydrogen storage charging and discharging control method for a new energy micro-grid is characterized by comprising the following steps: the method comprises the following steps:
classifying the photovoltaic power generation conditions in the new energy, wherein the photovoltaic power generation conditions comprise two conditions of excessive power generation and insufficient power generation;
when photovoltaic power generation in the new energy is excessive;
case 1: w is more than or equal to w up Now, the rotation speed of the flywheel reaches the upper limit value w up It cannot be charged;
in case 1, when hydrogen storage is inoperable, the hydrogen tank is full and the large-capacity storage cannot be charged by electrolysis, or the reversible solid oxide cell cannot be operated as a fuel cell; injecting the surplus energy of photovoltaic power generation into a microgrid, wherein the expression is shown as follows;
E grid ＝ΔE
in the formula, E grid Representing the energy flowing out or in from the microgrid, Δ E representing the difference between the photovoltaic output energy and the energy required by the load;
case 2: w is less than w up The flywheel energy storage can store energy;
under the condition 2, when hydrogen storage cannot work, the flywheel stores energy to absorb surplus energy of photovoltaic power generation, and the energy exceeding the energy storage capacity of the flywheel flows into a power grid, wherein the expression is shown as follows;
E grid ＝ΔE-E smooth
case 3: w > w lp The flywheel energy storage can release energy;
in case 3, when hydrogen storage is not working, the reversible solid oxide cell cannot operate in fuel cell mode, the flywheel stores energy and decelerates until it reaches its capacity limit; if the energy provided by the flywheel energy storage is insufficient, the micro-grid provides the rest part, and the expression is as follows;
E grid ＝|ΔE|-E smooth
case 4: w is less than or equal to w lp Now, the rotation speed of the flywheel has reached the lower limit value w lp Energy release cannot be performed;
under the condition 4, when the hydrogen storage can not work, the flywheel is under the operable rotating speed, and the load requirement is met through the microgrid, wherein the expression is as follows;
E grid ＝|ΔE|-E soe 。
2. the flywheel energy storage and hydrogen storage charging and discharging control method for the new energy microgrid as claimed in claim 1, characterized in that: in case 1, the hydrogen storage is performed in an energy storage mode, and the photovoltaic excess energy can store hydrogen in the hydrogen tank by electrolysis: the demand of hydrogen storage is less than the energy exceeding the photovoltaic power generation, the energy required by electrolysis is output from the photovoltaic power generation, and the residual energy exceeding the electrolysis demand can be injected into a power grid; the demand of hydrogen storage is greater than the energy exceeding the photovoltaic power generation, the whole exceeding energy can be stored in a hydrogen storage tank, and the flywheel releases energy to the reversible solid oxide cell according to the rotating speed condition of the flywheel, so that the power of the photovoltaic output is smoother, and the expression is shown in the specification;
E grid ＝ΔE-E soe
E grid ＝E soe -ΔE-E smooth
in the formula, E soe Represents the energy required for electrolysis, E smooth Representing the energy of the flywheel stored energy smoothing system.
3. The flywheel energy storage and hydrogen storage charging and discharging control method for the new energy microgrid according to claim 2, characterized in that: in the case 1, the energy storage and release working mode is carried out, the energy injected into the power grid is equal to the surplus energy of photovoltaic power generation and the energy released by the hydrogen storage, and the expression is shown as follows;
E grid ＝ΔE+E sof
in the formula, E sof Representing the energy released by the hydrogen storage.
4. The flywheel energy storage and hydrogen storage charging and discharging control method for the new energy microgrid according to claim 1, characterized in that: in case 2, the hydrogen storage is performed in an energy storage mode, and the photovoltaic excess energy stores hydrogen for the hydrogen tank by electrolysis: the energy exceeding the energy storage capacity of the hydrogen storage can be absorbed by the energy storage of the flywheel, and if the maximum capacity of the flywheel is reached, the energy is injected into a power grid; if the energy exceeding the photovoltaic power generation does not meet the requirement of hydrogen storage, in order to fill the gap, the flywheel transmits the energy to the hydrogen storage through deceleration, and when the energy release of the flywheel reaches the maximum limit, the flywheel can also absorb the energy from the power grid, and the expression is shown in the specification;
E grid ＝ΔE-E soe -E smooth
E grid ＝E soe -ΔE-E smooth 。
5. the flywheel energy storage and hydrogen storage charging and discharging control method for the new energy microgrid according to claim 4, characterized in that: under the condition 2, the energy storage and release working mode is carried out, the energy injected into the power grid is equal to the surplus energy of photovoltaic power generation and the energy released by the hydrogen storage, and the energy absorbed by the energy storage of the flywheel is subtracted, wherein the expression is shown as follows;
E grid ＝ΔE+E sof -E smooth
photovoltaic power generation in new energy is insufficient.
6. The flywheel energy storage and hydrogen storage charging and discharging control method for the new energy microgrid as claimed in claim 1, characterized in that: in the case 3, the hydrogen storage is performed in an energy storage working mode, when the reversible solid oxide battery is electrolyzed, the flywheel stores energy to release energy according to a given power curve, and the energy is absorbed from the microgrid only when the maximum power of the flywheel generator is reached, wherein the expression is shown as follows;
E grid ＝|ΔE|+E soe -E smooth 。
7. the flywheel energy storage and hydrogen storage charging and discharging control method for the new energy microgrid according to claim 6, characterized in that: in the case 3, the hydrogen storage is in an energy release working mode, the energy released by the hydrogen storage is larger than the required energy, the rest part is used for accelerating the flywheel, and when the maximum rotating speed of the flywheel is reached, the flywheel is injected into the microgrid; the energy released by the stored hydrogen is less than the required energy, the flywheel stores energy and decelerates until reaching the capacity limit, if the energy provided by the flywheel stored energy and the stored hydrogen is insufficient, the micro-grid provides the rest part, and the expression is as follows;
E grid ＝E sof -|ΔE|-E smooth
E grid ＝|ΔE|-E sof -E smooth 。
8. the flywheel energy storage and hydrogen storage charging and discharging control method for the new energy microgrid according to claim 1, characterized in that: in case 4, the hydrogen storage is in an energy storage working mode, and the flywheel energy storage cannot reduce the energy burden introduced by electrolysis; the energy required by the reversible solid oxide battery in the electrolysis is satisfied by the micro-grid, the flywheel keeps idling until the flywheel is completely decelerated due to the influence of kinetic energy loss, and the expression is shown;
E grid ＝|ΔE|。
9. the flywheel energy storage and hydrogen storage charging and discharging control method for the new energy microgrid according to claim 8, characterized in that: in the case 4, the hydrogen storage is carried out in an energy release working mode, the energy released by the hydrogen storage is more than the required energy, the rest part is used for accelerating the flywheel, and when the maximum rotating speed of the flywheel is reached, the flywheel is injected into the microgrid; the energy released by hydrogen storage is less than the required energy, and the energy balance is carried out through a microgrid, wherein the expression is shown as follows;
E grid ＝|ΔE|-E sof -E smooth
E grid ＝|ΔE|-E sof 。
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