CN113612260A - Electric-hydrogen island direct current micro-grid operation control method - Google Patents
Electric-hydrogen island direct current micro-grid operation control method Download PDFInfo
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- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 149
- 239000001257 hydrogen Substances 0.000 title claims abstract description 149
- 238000000034 method Methods 0.000 title claims abstract description 22
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 130
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 97
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 97
- 238000010248 power generation Methods 0.000 claims abstract description 68
- 238000004519 manufacturing process Methods 0.000 claims abstract description 61
- 238000004146 energy storage Methods 0.000 claims abstract description 20
- 238000011217 control strategy Methods 0.000 claims abstract description 15
- 230000002452 interceptive effect Effects 0.000 claims abstract description 5
- 238000004891 communication Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 2
- 230000006735 deficit Effects 0.000 description 2
- 238000005984 hydrogenation reaction Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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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
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
- 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
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
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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 an operation control method for a power-hydrogen island direct current micro-grid, which comprises the following steps: determining switching conditions between the operation mode of the system and different operation modes according to the difference between the wind-solar power generation system and the hydrogen production requirement, the charge state of the lithium battery and the hydrogen state of the hydrogen storage tank; determining control strategies of various interface devices corresponding to the wind turbine generator, the photovoltaic power generation system, the lithium battery energy storage system and the hydrogen production unit in different operation modes; and step three, determining the interactive information between the upper layer power management and the local equipment. The method can schedule the power of the distributed power generation unit and the power of the hydrogen production unit in real time according to the running state of each unit of the system through a power management algorithm, so as to realize the stable running of the system. The hydrogen production unit and the renewable energy are combined, so that the hydrogen production cost can be reduced, and the utilization rate of the renewable energy can be improved.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to an operation control method for a power-hydrogen island direct current micro-grid.
Background
The problems of energy crisis and environmental pollution are important factors for restricting the rapid development of the economy of all countries in the world. Optimizing energy configuration, improving the power generation proportion of clean energy, and realizing clean and low-carbon sustainable development is the main development trend in the field of electric power energy in the future. The rapid development and utilization of wind and light renewable energy sources is a major measure to solve the above problems. In recent years, wind and light power generation systems have been rapidly developed, and with the continuous increase of installed capacity, how to efficiently consume large-scale renewable energy sources has become a key technical problem.
Under the drive of factors such as carbon emission reduction, energy safety, promotion of economic growth and the like, hydrogen energy application is widely concerned. At present, the hydrogen production method is diversified, and the method for producing hydrogen by adopting renewable energy sources is a clean and green hydrogen production scheme and is an important development direction in the future. Because the output power of wind and light power generation systems has the characteristics of uncertainty and intermittency and cannot be matched with the power demand of a power grid or a load in real time, an energy storage system is required to be configured to absorb or compensate the unbalanced power between the renewable energy sources and the load. At present, the most commonly used energy storage unit is a lithium battery, although the lithium battery has a rapid dynamic response capability, the lithium battery belongs to short-term energy storage, and has high cost, and unbalanced power cannot be absorbed for a long time. The hydrogen is used as an energy carrier, has the characteristics of high energy density, large capacity, long service life, convenience in storage and transmission and the like, and the excess renewable energy is used for producing hydrogen, so that the hydrogen can be directly applied, and can form hydrogen energy storage with a hydrogen storage tank and a fuel cell to realize the complementary conversion of the hydrogen energy and the electric energy. The hydrogen production by water electrolysis is a long-term energy storage mode, and can well fill up the defect of low energy storage density of the lithium battery. Fuel-oil vehicles are the main contributors to carbon dioxide emission, and hydrogen fuel cell vehicles have been rapidly developed in order to realize clean, low-carbon, and green rail traffic. In order to meet the hydrogenation requirement of a hydrogen fuel cell automobile, a hydrogenation station needs to be quickly arranged. Because the hydrogen input cost is high, the method combines the renewable energy source and the electrolytic cell to realize local hydrogen production, is an effective mode for reducing the hydrogen production cost, can realize the complementary conversion of a power grid and a gas grid, and can improve the utilization rate of the renewable energy source. In addition, with the rapid development of hydrogen energy, the development of upstream and downstream industries can be driven, new power is provided for economic growth, and the employment demand can be increased.
Because the hydrogen production unit and the lithium battery energy storage both adopt a direct current input/output form, compared with an alternating current access scheme, the system overall efficiency can be better improved by adopting a direct current microgrid architecture, and the investment cost is reduced. A typical structure of the electricity-hydrogen island direct current micro-grid is shown in the figure.
According to fig. 1, a typical structure of an island direct current micro-grid comprises a wind and light renewable energy power generation system, a lithium battery energy storage unit and a hydrogen production unit, and all the units are converged into a direct current bus. The direct-drive permanent magnet synchronous generator set is connected to a direct current bus through a voltage source type PWM rectifier, and the photovoltaic power generation unit adopts a boost converter as an interface device. The lithium battery energy storage system is a main control unit of an island direct current micro-grid, and a bidirectional DC/DC converter is adopted to realize the charge and discharge control of the lithium battery. In order to enhance the redundancy and reliability of the hydrogen production system and increase the operation range of the hydrogen production system, a modular structure is adopted, each hydrogen production unit is composed of an electrolytic cell and a step-down converter, and hydrogen generated by the electrolytic cell is stored in a hydrogen storage tank. However, in the prior art, some technical problems still exist how to ensure the stable, safe and efficient operation of the electricity-hydrogen island direct current micro-grid.
Disclosure of Invention
In order to solve the technical problems and ensure the stable operation of the electric-hydrogen island direct current micro-grid, the invention provides an electric-hydrogen island direct current micro-grid operation control method, which fills up the blank of the related technology and has wide application prospect.
The technical scheme of the invention is as follows: a method for controlling the operation of a power-hydrogen island direct current micro-grid comprises the following steps:
determining switching conditions between the operation mode of the system and different operation modes according to the difference between the wind-solar power generation system and the hydrogen production requirement, the charge state of the lithium battery and the hydrogen state of the hydrogen storage tank;
determining control strategies of various interface devices corresponding to the wind turbine generator, the photovoltaic power generation system, the lithium battery energy storage system and the hydrogen production unit in different operation modes;
and step three, determining the interactive information between the upper layer power management and the local equipment.
Further, the first step of determining the switching conditions between the operation mode of the system and different operation modes according to the difference between the wind-solar power generation system and the hydrogen production requirement, the state of charge of the lithium battery and the hydrogen state of the hydrogen storage tank specifically comprises the following steps:
defining the difference power between the wind-solar power generation system and the hydrogen production requirement as follows:
Pe＝Ppv+Pw-Pae (1)
in the formula: peIs the difference power; ppvIs the photovoltaic power; pwIs the fan power; paeThe power requirement for hydrogen production.
The state of charge (SOC) of a lithium battery is:
in the formula: q is the lithium battery capacity; i.e. ibIs the current of a lithium battery.
The hydrogen state of the hydrogen storage tank is:
in the formula: psIs the hydrogen storage tank pressure; psmaxIs the upper limit of the pressure of the hydrogen storage tank.
According to the formula (1), when P iseGreater than or equal to 0 indicates a power excess, Pe<0 indicates insufficient power; the operation modes are divided according to the situations of power excess or power shortage respectively.
Further, in the case of the power excess state, the operation mode is divided as follows:
mode of operation 1, lithium battery SSOCAnd a hydrogen storage tank SSOHIn a safe working interval, when Pe<PbNWhen the wind and light power generation system works in a maximum power tracking mode, the lithium battery is charged with the difference power;
mode of operation 2, lithium battery SSOCAnd a hydrogen storage tank SSOHIn a safe working interval, when Pe≥PbNThen, the lithium battery will be at the rated power PbNCharging is carried out, and meanwhile, the wind-solar power generation system is switched to a power-limiting working mode, so that the output power of the wind-solar power generation system is reduced;
mode of operation 3, lithium battery SSOCIn the safe working interval, the pressure of the hydrogen storage tank reaches the upper limit, when P ise<PbNWhen the hydrogen production unit is in standby, the lithium battery is charged with the difference power;
operation mode 4, lithium battery SSOCIn the safe working interval, the pressure of the hydrogen storage tank reaches the upper limit, when P ise≥PbNIn the meantime, the hydrogen production unit is switched to standby, and the lithium battery is in rated power PbNCharging is carried out, and meanwhile, the power generation power of the wind-solar power generation system needs to be limited;
operation mode 5, hydrogen storage tank SSOHIn a safe working space, a lithium battery SSOCWhen the upper limit is reached, the wind-solar power generation system works in a power limiting mode, and the output power of the wind-solar power generation system is reduced until the lithium battery is converted into a discharging mode;
operating mode 6, lithium battery SSOCAnd a hydrogen storage tank SSOHThe renewable energy power generation system, the lithium battery and the hydrogen production unit are all switched to standby mode to wait for restarting.
Further, in the case of the deficit power state, the operation mode is divided as follows:
mode of operation 7, lithium battery SSOCAnd a hydrogen storage tank SSOHIn a safe working space, when | Pe|<PbNWhen the wind and light power generation system works in a maximum power tracking mode, the lithium battery discharges with the difference power;
mode of operation 8, lithium battery SSOCAnd a hydrogen storage tank SSOHIn a safe working space, when | Pe|≥PbNThen, the lithium battery will be at the rated power PbNDischarging is carried out, the requirement for hydrogen production is reduced, and power balance is maintained;
operation mode 9, hydrogen storage tank SSOHIn a safe working space, a lithium battery SSOCReaching a lower limit, at which point the need for hydrogen production needs to be reduced until the lithium battery is switched to charging;
and in the operation mode 10, when the pressure of the hydrogen storage tank reaches the upper limit, the renewable energy power generation system, the lithium battery and the hydrogen production unit are switched to the standby mode to wait for restarting.
Further, the second step of determining the control strategies of the interface devices corresponding to the different operation modes specifically includes:
(1) the control strategy of the wind turbine generator and the fan have three working modes, including: a standby mode, a maximum power tracking mode, and a limited power mode;
(2) the photovoltaic power generation system control strategy is characterized in that photovoltaic power generation coexists in three working modes, including a standby mode, a maximum power tracking mode and a limited power mode;
(3) lithium battery energy storage system control strategy, lithium battery energy storage system are island direct current microgrid's the main control unit, and its control mode includes: constant voltage control and standby mode;
(4) the hydrogen production unit is equivalent to controllable load, and the power balance of the system is maintained by loading and unloading, and the control mode comprises the following steps: constant power control and standby mode.
Further, the step three of determining the interaction information between the upper layer power management and the local device specifically includes:
(1) the electric information of each device of the stratum is collected through a communication mode, wherein the electric information comprises the following steps: output power P of fan setwOutput power P of photovoltaic power generation unitpvOutput power P of lithium battery unitbElectric power P required by hydrogen production unitaeDC bus voltage UdcLithium battery SSOCAnd a hydrogen storage tank SSOH(ii) a Realizing selection of an upper layer power management strategy and an operation mode;
(2) each interface converter has multiple control modes and can execute a mode conversion instruction and a power scheduling instruction issued by an upper layer power management system, so that each device in the stratum can stably and reliably run in multiple running modes;
(3) the wind and light power generation system needs to be provided with a power prediction module to predict the theoretical power generation of the wind and light power generation system and transmit the power to a power management system in a communication mode, so that the power management of the direct-current micro-grid is realized.
Has the advantages that:
the invention provides a double-layer control method for a power-hydrogen island direct-current microgrid, which comprises an upper-layer power management module and a local equipment layer cooperative control method. The method can schedule the power of the distributed power generation units and the hydrogen production units in real time according to the running state of each unit of the system through a power management algorithm, so as to realize the stable running of the system. The hydrogen production unit and the renewable energy are combined, so that the hydrogen production cost can be reduced, and the utilization rate of the renewable energy can be improved.
Drawings
FIG. 1 is a block diagram of a typical structure of an island DC microgrid;
fig. 2 is a general block diagram of the control system of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person skilled in the art based on the embodiments of the present invention belong to the protection scope of the present invention without creative efforts.
According to an embodiment of the invention, a double-layer control method for an electricity-hydrogen island direct current microgrid is provided, and comprises the following steps:
determining switching conditions between the operation mode of the system and different operation modes according to the difference between the wind-solar power generation system and the hydrogen production requirement, the charge state of the lithium battery and the hydrogen state of the hydrogen storage tank;
determining control strategies of various interface devices corresponding to the wind turbine generator, the photovoltaic power generation system, the lithium battery energy storage system and the hydrogen production unit in different operation modes;
and step three, determining the interactive information between the upper layer power management and the local equipment.
In the first step, a switching condition between an operation mode and different operation modes of a system is determined, and the operation mode and the switching condition are specifically analyzed as follows:
(1) according to the structure of fig. 1, the difference power between the wind-solar power generation system and the hydrogen production requirement is defined as:
Pe＝Ppv+Pw-Pae (1)
in the formula: peIs the difference power; ppvIs the photovoltaic power; pwIs the fan power; paeThe power requirement for hydrogen production.
The state of charge (SOC) of a lithium battery is:
in the formula: q is the lithium battery capacity; i.e. ibIs the current of a lithium battery.
The hydrogen state of the hydrogen storage tank is:
in the formula: psIs the hydrogen storage tank pressure; psmaxIs the upper limit of the pressure of the hydrogen storage tank.
According to the formula (1), when P iseGreater than or equal to 0 indicates a power excess, Pe<0 indicates insufficient power.
(2) In the power excess state, the power excess state is pattern-divided as follows.
Mode of operation 1, lithium battery SSOCAnd a hydrogen storage tank SSOHIn a safe working interval, when Pe<PbNAnd meanwhile, the lithium battery is charged with the difference power, and the wind-solar power generation system works in a maximum power tracking mode.
Mode of operation 2, lithium battery SSOCAnd a hydrogen storage tank SSOHIn a safe working interval, when Pe≥PbNThen, the lithium battery will be at the rated power PbNAnd charging is carried out, and meanwhile, the wind-solar power generation system is switched to a power-limiting working mode, so that the output power of the wind-solar power generation system is reduced.
Mode of operation 3, lithium battery SSOCIn the safe working interval, the pressure of the hydrogen storage tank reaches the upper limit, when P ise<PbNAnd meanwhile, the hydrogen production unit is switched to stand by, and the lithium battery is charged with the difference power.
Operation mode 4, lithium battery SSOCIn the safe working interval, the pressure of the hydrogen storage tank reaches the upper limit, when P ise≥PbNIn the meantime, the hydrogen production unit is switched to standby, and the lithium battery is in rated power PbNAnd charging is carried out, and meanwhile, the power generation power of the wind-solar power generation system needs to be limited.
Operation mode 5, hydrogen storage tank SSOHIn a safe working space, a lithium battery SSOCAnd when the upper limit is reached, the wind and light power generation system works in a power limiting mode, and the output power of the wind and light power generation system is reduced until the lithium battery is converted into a discharging mode.
Operating mode 6, lithium battery SSOCAnd a hydrogen storage tank SSOHThe renewable energy power generation system, the lithium battery and the hydrogen production unit are all switched to standby mode to wait for restarting.
(3) In the deficit power state, the operation mode is divided as follows.
Mode of operation 7, lithium battery SSOCAnd a hydrogen storage tank SSOHIn a safe working space, when | Pe|<PbNAnd meanwhile, the lithium battery discharges with the difference power, and the wind-solar power generation system works in a maximum power tracking mode.
Mode of operation 8, lithium battery SSOCAnd a hydrogen storage tank SSOHIn a safe working space, when | Pe|≥PbNThen, the lithium battery will be at the rated power PbNDischarge is carried out, hydrogen production requirements are reduced, and power balance is maintained.
Operation mode 9, hydrogen storage tank SSOHIn a safe working space, a lithium battery SSOCThe lower limit is reached at which point the need for hydrogen production needs to be reduced until the lithium battery is switched to charging.
And in the operation mode 10, when the pressure of the hydrogen storage tank reaches the upper limit, the renewable energy power generation system, the lithium battery and the hydrogen production unit are switched to the standby mode to wait for restarting.
In the second step, the control strategies of the corresponding interface devices in different operation modes are determined:
(1) and (5) controlling the wind turbine generator. According to the analysis, the blower coexists in three working modes, including: standby mode, maximum power tracking mode, and limited power mode.
(2) And (4) photovoltaic power generation system control strategy. Similar to a fan, the fan coexists in three working modes, including a standby mode, a maximum power tracking mode and a limited power mode.
(3) And (5) controlling a lithium battery energy storage system. The lithium battery energy storage system is a main control unit of an island direct current micro-grid, and the control mode of the lithium battery energy storage system comprises the following steps: constant voltage control and standby mode.
(4) Hydrogen production unit control strategy. The hydrogen production unit is equivalent to a controllable load, and can maintain the power balance of the system by loading and unloading, and the control mode comprises the following steps: constant power control and standby mode.
In the third step, the interactive information between the upper layer power management and the local device is determined:
(1) in order to implement selection of an upper layer power management strategy and an operation mode, electrical information of each device in a local stratum needs to be acquired in a communication mode, wherein the acquisition of the electrical information includes: output power P of fan setwOutput power P of photovoltaic power generation unitpvOutput power P of lithium battery unitbElectric power P required by hydrogen production unitaeDC bus voltage UdcLithium battery SSOCAnd a hydrogen storage tank SSOH。
(2) In order to realize that each device in the local stratum can stably and reliably operate in multiple operation modes, according to the second step, each interface converter needs to have multiple control modes and can execute a mode conversion instruction and a power scheduling instruction issued by an upper layer power management system.
(3) In order to better realize the power management of the direct-current micro-grid, a wind and light power generation system needs to be provided with a power prediction module to predict the theoretical power generation of the wind and light power generation system and transmit the power to a power management system in a communication mode.
The general block diagram of the system for implementing the control method is shown in fig. 2.
In summary, the invention provides a double-layer control method for a power-hydrogen island direct current microgrid, which comprises an upper layer power management module and a local equipment layer cooperative control method. The method can schedule the power of the distributed power generation units and the hydrogen production units in real time according to the running state of each unit of the system through a power management algorithm, so as to realize the stable running of the system. The hydrogen production unit and the renewable energy are combined, so that the hydrogen production cost can be reduced, and the utilization rate of the renewable energy can be improved.
Although illustrative embodiments of the present invention have been described above to facilitate the understanding of the present invention by those skilled in the art, it should be understood that the present invention is not limited to the scope of the embodiments, but various changes may be apparent to those skilled in the art, and it is intended that all inventive concepts utilizing the inventive concepts set forth herein be protected without departing from the spirit and scope of the present invention as defined and limited by the appended claims.
Claims (6)
1. A method for controlling the operation of a power-hydrogen island direct current micro-grid is characterized by comprising the following steps:
determining switching conditions between the operation mode of the system and different operation modes according to the difference between the wind-solar power generation system and the hydrogen production requirement, the charge state of the lithium battery and the hydrogen state of the hydrogen storage tank;
determining control strategies of various interface devices corresponding to the wind turbine generator, the photovoltaic power generation system, the lithium battery energy storage system and the hydrogen production unit in different operation modes;
and step three, determining the interactive information between the upper layer power management and the local equipment.
2. The method for controlling the operation of the electricity-hydrogen island direct current microgrid according to claim 1, wherein the step one of determining the switching conditions between the operation mode of the system and different operation modes according to the difference between the wind and solar power generation system and the hydrogen production requirement, the charge state of the lithium battery and the hydrogen state of the hydrogen storage tank specifically comprises the following steps:
defining the difference power between the wind-solar power generation system and the hydrogen production requirement as follows:
Pe＝Ppv+Pw-Pae (1)
in the formula: peIs the difference power; ppvIs the photovoltaic power; pwIs the fan power; paePower requirements for hydrogen production;
the state of charge (SOC) of a lithium battery is:
in the formula: q is the lithium battery capacity; i.e. ibIs the current of the lithium battery;
the hydrogen state of the hydrogen storage tank is:
in the formula: psIs the hydrogen storage tank pressure; psmaxIs the upper limit of the pressure of the hydrogen storage tank;
according to formula (1), when P iseGreater than or equal to 0 indicates a power excess, Pe<0 indicates insufficient power; the operation modes are divided according to the situations of power excess or power shortage respectively.
3. An electric-hydrogen island DC micro grid operation control method according to claim 2, characterized in that, in the power surplus state, the operation mode is divided as follows:
operation ofMode 1, lithium battery SSOCAnd a hydrogen storage tank SSOHIn a safe working interval, when Pe<PbNWhen the wind and light power generation system works in a maximum power tracking mode, the lithium battery is charged with the difference power;
mode of operation 2, lithium battery SSOCAnd a hydrogen storage tank SSOHIn a safe working interval, when Pe≥PbNThen, the lithium battery will be at the rated power PbNCharging is carried out, and meanwhile, the wind-solar power generation system is switched to a power-limiting working mode, so that the output power of the wind-solar power generation system is reduced;
mode of operation 3, lithium battery SSOCIn the safe working interval, the pressure of the hydrogen storage tank reaches the upper limit, when P ise<PbNWhen the hydrogen production unit is in standby, the lithium battery is charged with the difference power;
operation mode 4, lithium battery SSOCIn the safe working interval, the pressure of the hydrogen storage tank reaches the upper limit, when P ise≥PbNIn the meantime, the hydrogen production unit is switched to standby, and the lithium battery is in rated power PbNCharging is carried out, and meanwhile, the power generation power of the wind-solar power generation system needs to be limited;
operation mode 5, hydrogen storage tank SSOHIn a safe working space, a lithium battery SSOCWhen the upper limit is reached, the wind-solar power generation system works in a power limiting mode, and the output power of the wind-solar power generation system is reduced until the lithium battery is converted into a discharging mode;
operating mode 6, lithium battery SSOCAnd a hydrogen storage tank SSOHThe renewable energy power generation system, the lithium battery and the hydrogen production unit are all switched to standby mode to wait for restarting.
4. An electric-hydrogen island DC micro grid operation control method according to claim 2, characterized in that, in the condition of insufficient differential power, the operation mode is divided as follows:
mode of operation 7, lithium battery SSOCAnd a hydrogen storage tank SSOHIn a safe working space, when | Pe|<PbNIn time, the lithium battery discharges with the difference power, and the wind-solar power generation system works at the maximumA high-power tracking mode;
mode of operation 8, lithium battery SSOCAnd a hydrogen storage tank SSOHIn a safe working space, when | Pe|≥PbNThen, the lithium battery will be at the rated power PbNDischarging is carried out, the requirement for hydrogen production is reduced, and power balance is maintained;
operation mode 9, hydrogen storage tank SSOHIn a safe working space, a lithium battery SSOCReaching a lower limit, at which point the need for hydrogen production needs to be reduced until the lithium battery is switched to charging;
and in the operation mode 10, when the pressure of the hydrogen storage tank reaches the upper limit, the renewable energy power generation system, the lithium battery and the hydrogen production unit are switched to the standby mode to wait for restarting.
5. The method for controlling the operation of the power-hydrogen island direct current microgrid according to claim 1, wherein the second step of determining the control strategies of the interface devices corresponding to different operation modes specifically comprises:
(1) the control strategy of the wind turbine generator and the fan have three working modes, including: a standby mode, a maximum power tracking mode, and a limited power mode;
(2) the photovoltaic power generation system control strategy is characterized in that photovoltaic power generation coexists in three working modes, including a standby mode, a maximum power tracking mode and a limited power mode;
(3) lithium battery energy storage system control strategy, lithium battery energy storage system are island direct current microgrid's the main control unit, and its control mode includes: constant voltage control and standby mode;
(4) the hydrogen production unit is equivalent to controllable load, and the power balance of the system is maintained by loading and unloading, and the control mode comprises the following steps: constant power control and standby mode.
6. An electric-hydrogen island DC microgrid operation control method according to claim 1, characterized in that, the third step, determining the mutual information of upper layer power management and local equipment specifically includes:
(1) acquisition by communication meansThe electrical information of each device of the stratum comprises: output power P of fan setwOutput power P of photovoltaic power generation unitpvOutput power P of lithium battery unitbElectric power P required by hydrogen production unitaeDC bus voltage UdcLithium battery SSOCAnd a hydrogen storage tank SSOH(ii) a Realizing selection of an upper layer power management strategy and an operation mode;
(2) each interface converter has multiple control modes and can execute a mode conversion instruction and a power scheduling instruction issued by an upper layer power management system, so that each device in the stratum can stably and reliably run in multiple running modes;
(3) the wind and light power generation system needs to be provided with a power prediction module to predict the theoretical power generation of the wind and light power generation system and transmit the power to a power management system in a communication mode, so that the power management of the direct-current micro-grid is realized.
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