CN114142533B - Energy scheduling method and device for offshore floating hydrogen plant - Google Patents
Energy scheduling method and device for offshore floating hydrogen plant Download PDFInfo
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- CN114142533B CN114142533B CN202111449620.XA CN202111449620A CN114142533B CN 114142533 B CN114142533 B CN 114142533B CN 202111449620 A CN202111449620 A CN 202111449620A CN 114142533 B CN114142533 B CN 114142533B
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- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 58
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 58
- 239000001257 hydrogen Substances 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000000446 fuel Substances 0.000 claims abstract description 120
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 92
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 92
- 238000012544 monitoring process Methods 0.000 claims description 4
- 238000002955 isolation Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000004458 analytical method Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000006467 substitution reaction 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
- H02J3/381—Dispersed generators
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q10/00—Administration; Management
- G06Q10/06—Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
- G06Q10/063—Operations research, analysis or management
- G06Q10/0631—Resource planning, allocation, distributing or scheduling for enterprises or organisations
- G06Q10/06312—Adjustment or analysis of established resource schedule, e.g. resource or task levelling, or dynamic rescheduling
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q50/00—Information and communication technology [ICT] specially adapted for implementation of business processes of specific business sectors, e.g. utilities or tourism
- G06Q50/06—Energy or water supply
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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
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0075—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source according to economic or energy efficiency considerations, e.g. economic dispatch
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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
- H02J3/32—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
- H02J3/46—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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
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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
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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
-
- 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
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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
- H02J2300/30—The power source being a fuel cell
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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 discloses an energy scheduling method and device for an offshore floating hydrogen plant. The energy scheduling method of the offshore floating hydrogen plant comprises the following steps: collecting the total load demand power of the electric appliance and the propulsion motor in the electric power system and the charge state of the lithium battery pack; in the event that the total load demand power reaches an operating power point of the fuel cell, the total load demand power is provided solely by the fuel cell stack; and determining the operating power of the fuel cell stack and the lithium battery stack according to the state of charge and the total load demand power under the condition that the total load demand power is between any two adjacent operating power points. According to the technical scheme, the power fluctuation of the power system of the offshore floating hydrogen factory is reduced, and the power supply reliability is improved.
Description
Technical Field
The embodiment of the invention relates to the technology of an electric power system, in particular to an energy scheduling method and device of an offshore floating hydrogen plant.
Background
The green production mode of hydrogen energy has become a research hotspot in various countries. The ocean area is wide, solar energy, wind energy and water resources are rich, and the on-site hydrogen production by utilizing solar energy or wind energy on the ocean is a new trend of future green hydrogen development.
The supply of electricity at an offshore hydrogen production plant is a problem that must be addressed. However, due to changeable sea weather and more influencing factors, the reliability of the power supply scheme adopted by the current sea hydrogen production factory is often insufficient.
Disclosure of Invention
The invention provides an energy scheduling method and device for an offshore floating hydrogen plant, which are used for reducing power fluctuation of a system and improving power supply reliability.
In a first aspect, an embodiment of the present invention provides a method for energy scheduling of an offshore floating hydrogen plant, an electric power system of the offshore floating hydrogen plant including: the power supply module, the direct-current power distribution module, the alternating-current power distribution module, the propulsion motor, the electric appliance and the energy management module; the power supply module comprises a fuel cell group and a lithium battery group and is used for providing power; the direct current distribution module is respectively and electrically connected with the fuel cell set and the lithium battery set, and is used for converting direct current input by the fuel cell set and the lithium battery set into alternating current and supplying power to the propulsion motor; the alternating current distribution module is electrically connected with the direct current distribution module through an isolation transformer and is used for supplying power to the electric appliance; the energy management module is respectively and electrically connected with the power supply module, the direct current distribution module, the alternating current distribution module and the electric appliance and is used for monitoring and controlling the working states of the power supply module, the direct current distribution module, the alternating current distribution module and the electric appliance;
the energy scheduling method comprises the following steps: collecting the total load demand power of the electric appliance and the propulsion motor in the electric power system and the charge state of the lithium battery pack; in the event that the total load demand power reaches an operating power point of the fuel cell, the total load demand power is provided solely by the fuel cell stack; and determining the operating power of the fuel cell stack and the lithium battery stack according to the state of charge and the total load demand power under the condition that the total load demand power is between any two adjacent operating power points.
Optionally, the total load demand power is provided by the fuel cell stack alone, including:
the operating power of the fuel cell stack is equal to the operating power point, and the operating power of the lithium cell stack is 0, wherein the operating power point is equal to the total load demand power.
Optionally, determining the operating power of the fuel cell stack and the lithium battery stack according to the state of charge and the total load demand power includes:
determining the operating power of the fuel cell stack and the lithium cell stack according to the relative relation between the state of charge and the boundary point of the preset range when the state of charge is not within the preset range;
and under the condition that the charge state is in the preset range, determining the operating power of the fuel cell stack and the lithium cell stack according to the relative relation between the total load required power and the intermediate value of the two adjacent operating power points.
Optionally, determining the operating power of the fuel cell stack and the lithium battery stack according to the relative relationship between the state of charge and the boundary point of the preset range includes:
in the case that the state of charge is less than a first preset value, the operating power of the fuel cell stack is at the minimum operating power point above the total load demand, and the lithium cell stack absorbs the excess power of the fuel cell stack for charging;
if the state of charge is greater than a second preset value, the operating power of the fuel cell stack is at the maximum operating power point below the total load demand, and the operating power of the lithium cell stack is equal to the total load demand minus the operating power of the fuel cell stack; wherein the first preset value is smaller than the second preset value.
Optionally, determining the operating power of the fuel cell stack and the lithium battery stack according to the relative relation between the total load demand power and the intermediate value of two adjacent operating power points includes:
in the event that the total load demand is less than the intermediate value, the fuel cell stack selects the maximum operating power point below the total load demand, the operating power of the lithium cell stack being equal to the total load demand minus the operating power of the fuel cell stack;
in the case where the total load demand is not less than the intermediate value, the operating power of the fuel cell stack is at the minimum operating power point higher than the total load demand, and the lithium cell stack absorbs the excess power of the fuel cell stack for charging.
Optionally, the operating power point includes: 0. 25% rated power point, 50% rated power, 75% rated power, and 100% rated power.
Optionally, the preset range is 20% to 80%, the first preset value is 20%, and the second preset value is 80%.
Optionally, the lithium battery pack is routinely charged with at least one of wind power equipment, tidal power equipment, and light energy power equipment; the fuel cell stack is supplied with hydrogen from the offshore floating hydrogen plant.
In a second aspect, an embodiment of the present invention further provides an energy scheduling apparatus for an electric power system, where the energy scheduling apparatus for an electric power system includes: the system comprises an acquisition module, a first power determination module and a second power determination module; the acquisition module is used for acquiring the total load demand power of the electric appliance and the propulsion motor in the electric power system and the charge state of the lithium battery pack; a first power determination module for determining that the total load demand power is provided solely by the fuel cell stack if the total load demand power reaches an operating power point of the fuel cell; the second power determining module is used for determining the operating power of the fuel battery pack and the lithium battery pack according to the charge state and the total load demand power under the condition that the total load demand power is between any two adjacent operating power points.
In a third aspect, an embodiment of the present invention further provides an offshore floating hydrogen plant, which comprises the energy scheduling device of the electrical power system according to the second aspect.
The energy scheduling method and the energy scheduling device for the offshore floating hydrogen factory can collect the total load demand power and the charge state of the lithium battery pack, when the load demand power reaches the operation power point of the fuel cell, the fuel battery pack is only used for supplying power, when the load demand power is not equal to the operation power point of the fuel cell, the operation power of the fuel battery pack and the lithium battery pack is determined according to the charge state and the total load demand power, the energy scheduling for the offshore floating hydrogen factory is realized, the lithium battery pack can play a role in peak clipping and valley filling, the power fluctuation of a system is reduced, and the power supply reliability is improved.
Drawings
FIG. 1 is a schematic diagram of an electrical power system of an offshore floating hydrogen plant according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for energy scheduling for an offshore floating hydrogen plant provided by an embodiment of the present invention;
FIG. 3 is a schematic illustration of another method of energy scheduling for an offshore floating hydrogen plant in accordance with an embodiment of the present invention;
FIG. 4 is a schematic diagram of an energy scheduling method for an offshore floating hydrogen plant according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an energy scheduling device of an electric power system according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
The embodiment of the invention provides an electric power system of an offshore floating hydrogen plant. Fig. 1 is a schematic structural diagram of an electric power system of an offshore floating hydrogen plant according to an embodiment of the present invention, and referring to fig. 1, an electric power system 100 includes: a power supply module 101, a direct current power distribution module 102, an alternating current power distribution module 103, a propulsion motor 104, an electric appliance 105, and an energy management module 106 (connection relation with other modules is not shown); the power supply module 101 comprises a fuel cell stack 107 and a lithium battery stack 108, and the power supply module 101 is used for providing power; the direct current power distribution module 102 comprises a first input port a1, a second input port a2, a first output port b1 and a first power supply port c1, wherein the first input port a1 and the second input port a2 are respectively and electrically connected with the fuel cell stack 107 and the lithium cell stack 108 and are used for converting direct current input by the fuel cell stack 107 and the lithium cell stack 108 into alternating current and respectively outputting the alternating current to the first output port b1 and the first power supply port c1, and the first power supply port c1 supplies power for the propulsion motor 104; the ac power distribution module 103 includes a third input port a3, a second power supply port c2, and a third power supply port c3, where the third input port a3 is electrically connected to the first output port b1, and the ac power distribution module 103 is configured to output ac power through the second power supply port c2, convert the ac power into a preset voltage level, and output the ac power through the third power supply port c3, where the second power supply port c2 and the third power supply port c3 supply power to the electric appliance 105; the energy management module 106 is electrically connected to the power supply module 101, the dc power distribution module 102, the ac power distribution module 103, and the electrical appliance 105, respectively, and is configured to monitor and control the operating states of the power supply module 101, the dc power distribution module 102, the ac power distribution module 103, and the electrical appliance 105.
Specifically, the direct current power distribution module 102 includes a first direct current converter DC1, a second direct current converter DC2, a first inverter DA1, a second inverter DA2, a direct current bus DCBUS, at least five fuses, at least five circuit breakers, and a direct current bus DCBUS. The first circuit breaker s1, the first direct current converter DC1 and the first fuse FU1 are sequentially connected in series between the first input port a1 and the direct current bus DCBUS, the second circuit breaker s2, the second direct current converter DC2 and the second fuse FU2 are sequentially connected in series between the second input port a2 and the direct current bus DCBUS, the third circuit breaker s3, the first inverter DA1 and the third fuse FU3 are sequentially connected in series between the first output port b1 and the direct current bus DCBUS, and the fourth circuit breaker s4, the second inverter DA2 and the fourth fuse FU4 are sequentially connected in series between the first power supply port c1 and the direct current bus DCBUS. The fifth fuse FU5 and the fifth circuit breaker s5 are sequentially connected in series between the dc bus DCBUS and the fuel cell stack 107, and the dc distribution module 102 is further configured to supply power to the auxiliary units of the fuel cell stack 107. The auxiliary unit may be a radiator or the like. The dc power distribution module 102 includes at least two dc buses DCBUS, each of which is connected to at least one fuel cell stack 107, at least one lithium cell stack 108, and at least one propulsion motor 104. The direct current buses DCBUS are electrically connected through the circuit breaker and the fuse with the power operating mechanism, the plurality of straight buses are mutually standby, and if one row of direct current buses DCBUS breaks down, the circuit breaker and the fuse can ensure that the fault buses can not influence the normal work of other direct current buses DCBUS.
The alternating current distribution module 103 is electrically connected with the direct current distribution module 102 through an isolation transformer, the alternating current distribution module 103 comprises a daily transformer MT, a first alternating current bus AC380V, a second alternating current bus AC220V and at least five circuit breakers, a fifth circuit breaker s5 is connected in series between a third input port a3 and the first alternating current bus AC380V, a sixth circuit breaker s6 is connected in series between a second power supply port c2 and the first alternating current bus AC380V, a seventh circuit breaker s7, a daily transformer MT and an eighth circuit breaker s8 are connected in series between the first alternating current bus AC380V and the second alternating current bus AC220V in sequence, and a ninth circuit breaker s9 is connected in series between the second alternating current bus AC220V and the third power supply port c 3. The AC power distribution module 103 includes at least two first AC buses AC380V, the first AC buses AC380V are electrically connected through a breaker with a power operating mechanism, the first AC buses AC380V are standby, and if one row of the first AC buses AC380V fails, the breaker can ensure that the failure bus does not affect the normal operation of other first AC buses AC 380V. Fifth circuit breakers s5 are connected between each first alternating current bus AC380V and the corresponding third input port a3, an interlock is arranged between each fifth circuit breaker s5, an eighth circuit breaker s8 is arranged between each first alternating current bus AC380V and the corresponding second alternating current bus AC220V, and an interlock is also arranged between each eighth circuit breaker s8, so that the two first alternating current buses AC380V are prevented from being used simultaneously. The first AC bus AC380V may be a 380V AC bus, and may be connected to the electrical appliance 105 through the second power supply port c2 to supply power to the hydrogen liquefying device, the liquid hydrogen filling device and other electrical appliances 105 for hydrogen production in the hydrogen production plant. The second AC bus AC220V may be a 220V AC bus, and may be connected to the electrical consumer 105 through the third power supply port c3 to supply power to lighting devices and other daily electrical consumers 105 in the hydrogen production plant.
The energy management module 106 may be a management device with analysis, calculation, and monitoring functions, and is capable of monitoring each device in the fuel cell stack 107, the lithium battery stack 108, the propulsion motor 104, the electrical appliance 105, and the electrical power system, and performing comprehensive scheduling on energy distribution of the electrical power system.
The power system of the offshore floating hydrogen factory can utilize the energy management module to realize comprehensive dispatching of energy distribution of the power system, and ensure safe, stable and economical operation of the power system of the offshore floating hydrogen factory.
Optionally, the power system of the offshore floating hydrogen plant further comprises at least one of wind power equipment, tidal power equipment and light energy power equipment, the lithium battery pack is electrically connected with the wind power equipment, the tidal power equipment and/or the light energy power equipment, and the lithium battery pack is subjected to daily charging by using the at least one of the wind power equipment, the tidal power equipment and the light energy power equipment; the fuel cell stack can supply hydrogen from an offshore floating hydrogen plant, low emission and green power supply of an electric power system are realized, and the environment friendliness degree of the electric power system of the offshore floating hydrogen plant is improved.
The embodiment of the invention also provides an energy scheduling method of the offshore floating hydrogen plant, which can be implemented by adopting the power system of the offshore floating hydrogen plant. Fig. 2 is a flowchart of an energy scheduling method for an offshore floating hydrogen plant according to an embodiment of the present invention, and referring to fig. 2, the energy scheduling method for an offshore floating hydrogen plant includes:
s201, collecting total load demand power of an electric appliance and a propulsion motor in an electric power system and the charge state of a lithium battery pack.
Specifically, the total load demand power is the total power consumed in the power system, and can be the sum of the real-time power of the electric appliance, the real-time power of the propulsion motor and the power of other electric equipment in the power system. Real-time power of all electric appliances and propulsion motors in the electric power system is monitored in real time, and total load demand power is counted for use. The state of charge of the lithium battery pack connected to the working dc bus in the power system is collected and may be the ratio of the remaining capacity of the lithium battery pack to the capacity of the lithium battery pack in its fully charged state.
S202, in a case where the total load demand power reaches the operation power point of the fuel cell stack, the total load demand power is individually supplied by the fuel cell stack.
Specifically, the power value of the operation power point is the rated power of the fuel cell stack multiplied by a preset percentage, the fuel cell stack can be operated at several operation power points at a constant power, and when the power of the fuel cell stack needs to be switched, the fuel cell stack is only required to be switched from one operation power point to another operation power point. When the total load demand power is equal to a certain operation power point, the fuel cell stack is switched to the operation power point, and at this time, the operation power of the fuel cell stack is equal to the total load demand power, which may be separately provided by the fuel cell stack, and the output power of the lithium cell stack may be 0.
And S203, determining the operating power of the fuel cell stack and the lithium battery stack according to the charge state and the total load demand power under the condition that the total load demand power is between any two adjacent operating power points.
Specifically, under the condition that the total load demand power is not equal to any operation power point, the operation power of the fuel cell stack and the lithium cell stack is determined according to the state of charge of the lithium cell stack and the total load demand power through comprehensive analysis. If the state of charge of the lithium battery pack is lower than the preset value, the available electric quantity of the lithium battery pack is lower, at the moment, an operation power point slightly higher than the total load demand power can be selected for the fuel battery pack, and the lithium battery pack can absorb the redundant power for charging. If the state of charge of the lithium battery pack is higher than the preset value, the available electric quantity of the lithium battery pack is higher, and charging is not needed temporarily, and at the moment, an operation power point slightly lower than the total load required power can be selected for the fuel battery pack. The lithium battery pack can assist the fuel battery pack to supply power, and the running power of the lithium battery pack can be equal to the difference value between the total load required power and the running power of the fuel battery pack, so that the peak clipping and valley filling effects are achieved.
According to the energy scheduling method for the offshore floating hydrogen plant, provided by the embodiment, the total load demand power and the charge state of the lithium battery pack can be collected, when the load demand power reaches the operation power point of the fuel cell, the fuel battery pack is only used for supplying power, when the load demand power is not equal to the operation power point of the fuel cell, the operation power of the fuel battery pack and the lithium battery pack is determined according to the charge state and the total load demand power, the energy scheduling for the offshore floating hydrogen plant is realized, the lithium battery pack can play a role in peak clipping and valley filling, the power fluctuation of a system is reduced, and the power supply reliability is improved.
Fig. 3 is a schematic diagram of another energy scheduling method for an offshore floating hydrogen plant according to an embodiment of the present invention, and fig. 4 is a schematic diagram of an energy scheduling method for an offshore floating hydrogen plant according to an embodiment of the present invention, where the energy scheduling method for an offshore floating hydrogen plant includes, in combination with fig. 3 and 4:
s301, collecting total load demand power Pload of an electric appliance and a propulsion motor in an electric power system and the state of charge SOC of a lithium battery pack.
Specifically, the content of step S301 is the same as that of step S201, and will not be described here again.
And S302, when the total load demand power Pload reaches the operating power Pfc point of the fuel cell stack, the operating power Pfc of the fuel cell stack is equal to the operating power point, and the operating power Pbatt of the lithium cell stack is 0.
Specifically, when the total load demand power Pload is equal to any operating power point of the fuel cell stack, the operating power Pfc of the fuel cell stack may be equal to the operating power point, and all the electric appliances in the electric power system are powered by the fuel cell, and the operating power Pbatt of the lithium cell stack is 0. For example, the operating power Pfc point of the fuel cell stack may include a 0% rated power point, a 25% rated power point, a 50% rated power point, a 70% rated power point, and a 100% rated power point. When the fuel cell stack is operated at 25% of rated power, the output power is 25% of rated power Pefc.
S303, under the condition that the total load demand power Pload is between any two adjacent operation power points, if the state of charge SOC is not in a preset range, the operation power of the fuel cell stack and the lithium cell stack is determined according to the relative relation between the state of charge SOC and the boundary point of the preset range.
Specifically, the preset range may be between a first preset value and a second preset value, and the boundary point of the preset range is the first preset value and the second preset value, where the second preset value is greater than the first preset value. If the SOC is not within the preset range, the SOC of the lithium battery may be low, requiring charging, or high, to provide a larger power supply. If the SOC is smaller than the first preset value, it indicates that the available power of the lithium battery pack is low and needs to be charged, the operating power Pfc of the fuel battery pack may select a minimum operating power point higher than the total load demand, and the lithium battery pack may absorb the excess power of the fuel battery pack for charging. If the state of charge SOC is greater than the second preset value, which indicates that the available power of the lithium battery pack is higher, the lithium battery pack may be powered with a higher operating power, the operating power Pfc of the fuel battery pack may be selected to be lower than the maximum operating power point of the total load demand, and the operating power Pbatt of the lithium battery pack is equal to the total load demand minus the operating power Pfc of the fuel battery pack. The lithium battery pack can be charged quickly by using the redundant power of the fuel battery pack when the electric quantity is low, and can also assist the fuel battery to supply power when the electric quantity is high. For example, the first preset value may be 20% and the second preset value may be 80%, and the preset range is less than 80% and greater than 20%.
And S304, under the condition that the total load demand power Pload is between any two adjacent operation power points, if the state of charge SOC is in a preset range, determining the operation power of the fuel cell stack and the lithium cell stack according to the relative relation between the total load demand power Pload and the intermediate value of the two adjacent operation power points.
In particular, the intermediate value is the intermediate value of any two operating power points, and the intermediate value of the 0% rated power point and the 25% rated power point is, for example, 12.5% rated power point. At a total load demand between any two adjacent operating power points and less than the intermediate value of the two operating power points, the fuel cell stack selects the largest of all operating power points that is lower than the total load demand. The operating power of the lithium battery pack, pbatt, is equal to the total load demand minus the operating power of the fuel battery pack, pfc. Illustratively, if the total load demand is 27% of the fuel cell stack rated power Pefc and the state of charge SOC of the lithium battery is within the preset range, because the total load demand is between 25% rated power point and 50% rated power point and less than 37.5% rated power point, the operating power Pfc of the fuel cell stack is equal to 25% rated power point and the operating power Pbatt of the lithium battery stack is equal to 2% of the rated power Pefc of the fuel cell stack. Similarly, in the case where the total load demand is between any two adjacent operating power points and not less than the intermediate value, the operating power Pfc of the fuel cell stack is the minimum operating power point higher than the total load demand, and the lithium cell stack absorbs the surplus power of the fuel cell stack for charging. Illustratively, if the total load demand is 72% of the fuel cell stack rated power Pefc and the state of charge SOC of the lithium battery is within the preset range, because the total load demand is between 50% rated power point and 75% rated power point and not less than 62.5% rated power point, the operating power Pfc of the fuel cell stack is equal to 75% rated power point, and the lithium battery stack absorbs the remaining power of the fuel cell stack for charging itself.
According to the energy scheduling method for the offshore floating hydrogen plant, total load demand power and the charge state of the lithium battery pack can be collected, when the load demand power reaches the operation power point of the fuel cell, the fuel cell pack is only used for supplying power, when the load demand power is not equal to the operation power point of the fuel cell, the operation power of the fuel cell pack and the operation power of the lithium battery pack are determined according to the charge state and the total load demand power, the energy scheduling for the offshore floating hydrogen plant is achieved, the fuel cell pack is operated with constant power, the lithium battery pack can perform power compensation and load fluctuation response, scheduling and distribution of power grid energy is completed according to power load demands of different working conditions, response speed of energy scheduling is improved, power fluctuation of a system is reduced, and power supply reliability is improved.
The embodiment of the invention also provides an energy scheduling device of the power system. Fig. 5 is a schematic structural diagram of an energy scheduling device of an electric power system according to an embodiment of the present invention, and referring to fig. 5, an energy scheduling device 500 of an electric power system includes: the system comprises an acquisition module 501, a first power determination module 502 and a second power determination module 503, wherein the acquisition module 501 is used for acquiring total load required power of an electric appliance and a propulsion motor in an electric power system and the charge state of a lithium battery pack; the first power determining module 502 is configured to determine that the total load demand power is separately provided by the fuel cell stack if the total load demand power reaches an operating power point of the fuel cell; the second power determining module 503 is configured to determine the operating power of the fuel cell stack and the lithium cell stack according to the state of charge and the total load demand power in a case where the total load demand power is between any two adjacent operating power points.
The embodiment of the invention also provides an offshore floating hydrogen plant, which comprises the energy scheduling device of any power system.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, and that various obvious changes, rearrangements, combinations, and substitutions can be made by those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (9)
1. An energy scheduling method for an offshore floating hydrogen plant, characterized in that the power system comprises: the power supply module, the direct-current power distribution module, the alternating-current power distribution module, the propulsion motor, the electric appliance and the energy management module; the power supply module comprises a fuel cell group and a lithium battery group and is used for providing power; the direct current distribution module is respectively and electrically connected with the fuel cell set and the lithium battery set, and is used for converting direct current input by the fuel cell set and the lithium battery set into alternating current and supplying power to the propulsion motor; the alternating current distribution module is electrically connected with the direct current distribution module through an isolation transformer and is used for supplying power to the electric appliance; the energy management module is respectively and electrically connected with the power supply module, the direct current distribution module, the alternating current distribution module and the electric appliance and is used for monitoring and controlling the working states of the power supply module, the direct current distribution module, the alternating current distribution module and the electric appliance;
the energy scheduling method comprises the following steps:
collecting the total load demand power of the electric appliance and the propulsion motor in the electric power system and the charge state of the lithium battery pack;
in the event that the total load demand power reaches an operating power point of the fuel cell, the total load demand power is provided solely by the fuel cell stack;
determining the operating power of the fuel cell stack and the lithium battery stack according to the state of charge and the total load demand power, if the total load demand power is between any two adjacent operating power points;
the determining the operating power of the fuel cell stack and the lithium battery stack according to the state of charge and the total load demand power comprises:
determining the operating power of the fuel cell stack and the lithium cell stack according to the relative relation between the state of charge and the boundary point of the preset range when the state of charge is not within the preset range;
and under the condition that the charge state is in the preset range, determining the operating power of the fuel cell stack and the lithium cell stack according to the relative relation between the total load required power and the intermediate value of the two adjacent operating power points.
2. The method of energy scheduling for an offshore floating hydrogen plant of claim 1 wherein the total load demand power is provided solely by the fuel cell stack, comprising:
the operating power of the fuel cell stack is equal to the operating power point, and the operating power of the lithium cell stack is 0, wherein the operating power point is equal to the total load demand power.
3. The method of energy scheduling for an offshore floating hydrogen plant according to claim 1, wherein determining the operating power of the fuel cell stack and the lithium cell stack from the relative relationship of the state of charge and the boundary point of the preset range comprises:
in the case that the state of charge is less than a first preset value, the operating power of the fuel cell stack is at the minimum operating power point above the total load demand, and the lithium cell stack absorbs the excess power of the fuel cell stack for charging;
if the state of charge is greater than a second preset value, the operating power of the fuel cell stack is at the maximum operating power point below the total load demand, and the operating power of the lithium cell stack is equal to the total load demand minus the operating power of the fuel cell stack; wherein the first preset value is smaller than the second preset value.
4. The method of energy scheduling for an offshore floating hydrogen plant according to claim 1, wherein determining the operating power of the fuel cell stack and the lithium cell stack from the relative relationship of the total load demand power to the intermediate value of the adjacent two operating power points comprises:
in the event that the total load demand is less than the intermediate value, the fuel cell stack selects the maximum operating power point below the total load demand, the operating power of the lithium cell stack being equal to the total load demand minus the operating power of the fuel cell stack;
in the case where the total load demand is not less than the intermediate value, the operating power of the fuel cell stack is at the minimum operating power point higher than the total load demand, and the lithium cell stack absorbs the excess power of the fuel cell stack for charging.
5. The method of energy scheduling for an offshore floating hydrogen plant of claim 1, wherein the operating power point comprises: 0. 25% rated power point, 50% rated power, 75% rated power, and 100% rated power.
6. The method of energy scheduling for an offshore floating hydrogen plant according to claim 3, wherein the preset range is 20% to 80%, the first preset value is 20%, and the second preset value is 80%.
7. The energy scheduling method of an offshore floating hydrogen plant according to claim 1, wherein the lithium battery pack is daily charged with at least one of wind power plant, tidal power plant and light energy power plant;
the fuel cell stack is supplied with hydrogen from the offshore floating hydrogen plant.
8. An energy scheduling apparatus for an electric power system, comprising:
the collecting module is used for collecting the total load demand power of the electric appliances and the propulsion motor in the electric power system and the charge state of the lithium battery pack;
a first power determination module configured to determine that the total load demand power is provided by the fuel cell stack alone, if the total load demand power reaches an operating power point of a fuel cell;
a second power determining module, configured to determine, in a case where the total load demand power is between any two adjacent operating power points, operating powers of the fuel cell stack and the lithium cell stack according to the state of charge and the total load demand power;
the determining the operating power of the fuel cell stack and the lithium battery stack according to the state of charge and the total load demand power comprises:
determining the operating power of the fuel cell stack and the lithium cell stack according to the relative relation between the state of charge and the boundary point of the preset range when the state of charge is not within the preset range;
and under the condition that the charge state is in the preset range, determining the operating power of the fuel cell stack and the lithium cell stack according to the relative relation between the total load required power and the intermediate value of the two adjacent operating power points.
9. An offshore floating hydrogen plant comprising the energy scheduling apparatus of the electrical power system of claim 8.
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