CN114142533A - 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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- CN114142533A CN114142533A CN202111449620.XA CN202111449620A CN114142533A CN 114142533 A CN114142533 A CN 114142533A CN 202111449620 A CN202111449620 A CN 202111449620A CN 114142533 A CN114142533 A CN 114142533A
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- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 59
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 59
- 239000001257 hydrogen Substances 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000000446 fuel Substances 0.000 claims abstract description 116
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 88
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 88
- 238000012544 monitoring process Methods 0.000 claims description 4
- 238000002955 isolation Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000005611 electricity Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000011160 research Methods 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—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
- G06Q50/06—Electricity, gas 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
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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
- H02J2300/28—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
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 total load demand power of the electrical appliances and the propulsion motor in the power system and the state of charge of the lithium battery pack; the total load demand power is supplied by the fuel cell stack alone in a case where the total load demand power reaches an operating power point of the fuel cell; and under the condition that the total load required power is between any two adjacent operating power points, determining the operating power of the fuel battery pack and the lithium battery pack according to the state of charge and the total load required power. According to the technical scheme, the power fluctuation of the power system of the offshore floating hydrogen plant is reduced, and the power supply reliability is improved.
Description
Technical Field
The embodiment of the invention relates to the technology of power systems, in particular to an energy scheduling method and device for an offshore floating hydrogen plant.
Background
The green production mode of hydrogen energy has become a research hotspot of various countries. The ocean area is wide, solar energy, wind energy and water resources are rich, and the in-situ hydrogen production by utilizing solar energy or wind energy to generate electricity on the ocean is a new trend for the development of green hydrogen in the future.
The supply of electricity at an offshore hydrogen production plant is a problem that must be solved. However, because the weather at sea is variable and has more influence factors, the reliability of the power supply scheme adopted by the existing offshore hydrogen production plant is often insufficient.
Disclosure of Invention
The invention provides an energy scheduling method and device for an offshore floating hydrogen plant, which aim to reduce power fluctuation of a system and improve power supply reliability.
In a first aspect, an embodiment of the present invention provides an energy scheduling method for an offshore floating hydrogen plant, where an electric power system of the offshore floating hydrogen plant includes: the system comprises a power supply module, a direct current distribution module, an alternating current distribution module, a propulsion motor, an electric appliance and an energy management module; the power supply module comprises a fuel battery pack and a lithium battery pack and is used for providing power; the direct current distribution module is electrically connected with the fuel battery pack and the lithium battery pack respectively and is used for converting direct current input by the fuel battery pack and the lithium battery pack 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 used for supplying power to the electrical appliance; the energy management module is respectively electrically connected with the power supply module, the direct current distribution module, the alternating current distribution module and the electrical 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 electrical appliance;
the energy scheduling method comprises the following steps: collecting total load demand power of the electrical appliances and the propulsion motor in the power system and the state of charge of the lithium battery pack; the total load demand power is supplied by the fuel cell stack alone in a case where the total load demand power reaches an operating power point of the fuel cell; and under the condition that the total load required power is between any two adjacent operating power points, determining the operating power of the fuel battery pack and the lithium battery pack according to the state of charge and the total load required power.
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, the operating power of the lithium cell stack is 0, and 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 cell stack based on the state of charge and the total load demand power comprises:
determining the operating power of the fuel battery pack and the lithium battery pack according to the relative relation between the state of charge and the boundary point of the preset range under the condition that the state of charge is not in the preset range;
and under the condition that the state of charge is within the preset range, determining the operating power of the fuel battery pack and the lithium battery pack according to the relative relation between the total load required power and the intermediate value of two adjacent operating power points.
Optionally, determining the operating powers of the fuel cell stack and the lithium cell 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 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;
when the state of charge is larger than a second preset value, the operation power of the fuel cell stack is the maximum operation power point lower than the total load demand, and the operation power of the lithium cell stack is equal to the total load demand minus the operation 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 cell stack according to the relative relationship between the total load demand power and the intermediate value of two adjacent operating power points comprises:
in the case where the total load demand is less than the intermediate value, the fuel cell stack selects the maximum operating power point that is lower than 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 the minimum operating power point higher than the total load demand, and the lithium cell stack absorbs excess power of the fuel cell stack for charging.
Optionally, the operating power point comprises: 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 charged daily by at least one of a wind power plant, a tidal power plant and a photovoltaic power plant; 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 electrical power system, where the energy scheduling apparatus for an electrical power system includes: the device 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 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 by the fuel cell stack alone, in a case where the total load demand power reaches an operating power point of the fuel cell; and 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 state of charge and the total load required power under the condition that the total load required power is between any two adjacent operating power points.
In a third aspect, the embodiment of the present invention further provides an offshore floating hydrogen plant, where the offshore floating hydrogen plant includes the energy scheduling device of the power system in the second aspect.
The energy scheduling method and the energy scheduling device for the offshore floating hydrogen plant can adopt the total load required power and the charge state of the lithium battery pack, when the load required power reaches the operating power point of the fuel cell, the fuel battery pack only supplies power, and when the load required power is not equal to the operating power point of the fuel cell, the operating power of the fuel battery pack and the lithium battery pack is determined according to the charge state and the total load required power, so that 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.
Drawings
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;
fig. 2 is a flowchart of an energy scheduling method for an offshore floating hydrogen plant according to an embodiment of the present invention;
fig. 3 is another energy scheduling method for an offshore floating hydrogen plant according to an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating 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 apparatus of an electric power system according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The embodiment of the invention provides a 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, the electric power system 100 includes: a power supply module 101, a direct current distribution module 102, an alternating current distribution module 103, a propulsion motor 104, an electrical consumer 105, and an energy management module 106 (connections to other modules are not shown); the power supply module 101 comprises a fuel battery pack 107 and a lithium battery pack 108, and the power supply module 101 is used for supplying 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 electrically connected with the fuel battery pack 107 and the lithium battery pack 108 respectively and are used for converting direct current input by the fuel battery pack 107 and the lithium battery pack 108 into alternating current to be output to the first output port b1 and the first power supply port c1 respectively, and the first power supply port c1 is used for supplying power to the propulsion motor 104; the alternating current power distribution module 103 comprises a third input port a3, a second power supply port c2 and a third power supply port c3, the third input port a3 is electrically connected with the first output port b1, the alternating current power distribution module 103 is used for outputting alternating current through the second power supply port c2, converting the alternating current into a preset voltage level and outputting the preset voltage level through the third power supply port c3, and the second power supply port c2 and the third power supply port c3 both supply power to the electrical 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, and is configured to monitor and control 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 DC power distribution module 102 includes a first DC converter DC1, a second DC converter DC2, a first inverter DA1, a second inverter DA2, a DC bus DCBUS, at least five fuses, at least five circuit breakers, and a DC bus DCBUS. The first circuit breaker s1, the first DC converter DC1 and the first fuse FU1 are sequentially connected in series between the first input port a1 and the DC bus DCBUS, the second circuit breaker s2, the second DC converter DC2 and the second fuse FU2 are sequentially connected in series between the second input port a2 and the DC 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 DC 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 DC bus DCBUS. The fifth fuse FU5 and the fifth breaker s5 are sequentially connected in series between the dc bus DCBUS and the fuel cell stack 107, and the dc power 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 heat sink or the like. The dc distribution module 102 includes at least two dc buses, 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. Through taking electric operating mechanism's circuit breaker and fuse electricity to be connected between the direct current bus DCBUS, many sharp generating lines are each other for reserve, if one of them direct current bus DCBUS breaks down, circuit breaker and fuse can guarantee that the fault bus can not influence the normal work of other direct current bus 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 household 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 sequentially connected in series between the first alternating current bus AC380V and the second alternating current bus AC220V, 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 alternating current distribution module 103 comprises at least two first alternating current buses AC380V, the first alternating current buses AC380V are electrically connected through circuit breakers with electric operating mechanisms, the first alternating current buses AC380V are mutually standby, and if one row of the first alternating current buses AC380V breaks down, the circuit breakers can ensure that the normal work of other first alternating current buses AC380V cannot be influenced by the broken buses. 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, eighth circuit breakers s8 are arranged between each first alternating current bus AC380V and the second alternating current bus AC220V, and an interlock is also arranged between each eighth circuit breaker s8, so that two first alternating current buses AC380V are prevented from being used at the same time. 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 liquefaction equipment, the liquid hydrogen filling equipment, 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 consumer 105 through the third power port c3 to supply power to the lighting equipment and other household appliances 105 in the hydrogen plant.
The energy management module 106 may be a management device with analysis, calculation, and monitoring functions, and may monitor each device in the fuel cell stack 107, the lithium cell stack 108, the propulsion motor 104, the electrical appliance 105, and the power system, and perform comprehensive scheduling on energy distribution of the power system.
The power system of the offshore floating hydrogen plant can utilize the energy management module to realize comprehensive scheduling of power system energy distribution, and the power system of the offshore floating hydrogen plant is ensured to operate safely, stably and economically.
Optionally, the power system of the offshore floating hydrogen plant further comprises at least one of a wind power plant, a tidal power plant and a light power plant, the lithium battery pack is electrically connected with the wind power plant, the tidal power plant and/or the light power plant, and the lithium battery pack is charged daily by using at least one of the wind power plant, the tidal power plant and the light power plant; the fuel cell stack can be supplied with hydrogen by the offshore floating hydrogen plant, so that low emission and green power supply of the power system are realized, and the environment-friendly degree of the 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 of an offshore floating hydrogen plant according to an embodiment of the present invention, and referring to fig. 2, the energy scheduling method of an offshore floating hydrogen plant includes:
s201, collecting total load required power of electric appliances and a propulsion motor in the 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 may be the sum of the real-time power of the electrical appliance, the real-time power of the propulsion motor, and the power of other electrical appliances in the power system. And monitoring the real-time power of all electrical appliances and the propulsion motor in the power system in real time, and counting the total power required by the load. The charge state of the lithium battery pack connected with the working direct-current bus in the power system is collected and can be a ratio of the residual capacity of the lithium battery pack to the capacity of the lithium battery pack in a full charge state.
And S202, under the condition that the total load required power reaches the operating power point of the fuel cell stack, independently providing the total load required power by the fuel cell stack.
Specifically, the power value of the operating 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 operating power points at a constant power, and when the power of the fuel cell stack needs to be switched, the fuel cell stack only needs to be switched from one operating power point to another operating 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, at this time, the operation power of the fuel cell stack is equal to the total load demand power, the total load demand power can be provided by the fuel cell stack alone, and the output power of the lithium cell stack can be 0.
And S203, determining the operating power of the fuel battery pack and the lithium battery pack according to the state of charge and the total load required power under the condition that the total load required power is between any two adjacent operating power points.
Specifically, under the condition that the total load required power is not equal to any one operating power point, the operating power of the fuel battery pack and the operating power of the lithium battery pack are determined according to the state of charge of the lithium battery pack and the total load required power through comprehensive analysis. If the value of 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 low, at the moment, an operating power point slightly higher than the total load required power can be selected for the fuel battery pack, and the lithium battery pack can absorb redundant power to charge. If the value of 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, 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 operation power of the lithium battery pack can be equal to the difference value of the total load required power and the operation power of the fuel battery pack, so that the effects of peak clipping and valley filling are achieved.
The energy scheduling method for the offshore floating hydrogen plant can collect total load required power and the charge state of the lithium battery pack, when the load required power reaches the operating power point of the fuel cell, only the fuel battery pack supplies power, and when the load required power is not equal to the operating power point of the fuel cell, the operating power of the fuel battery pack and the lithium battery pack is determined according to the charge state and the total load required power, so that 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 another energy scheduling method for an offshore floating hydrogen plant according to an embodiment of the present invention, fig. 4 is a schematic diagram illustrating an energy scheduling method for an offshore floating hydrogen plant according to an embodiment of the present invention, and with reference to fig. 3 and fig. 4, the energy scheduling method for an offshore floating hydrogen plant includes:
s301, collecting total load required power Pload of electric appliances and a propulsion motor in the power system and the state of charge SOC of a lithium battery pack.
Specifically, step S301 is the same as step S201, and is not described herein again.
And S302, when the total load required 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 one of the operating power points of the fuel cell stack, the operating power Pfc of the fuel cell stack may be equal to the operating power point at which all the electrical loads in the power system are powered by the fuel cell, and the operating power Pbatt of the lithium cell stack is 0. Illustratively, 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 the 25% rated power point, the output power is 25% of the rated power Pefc.
S303, under the condition that the total load required power Pload is between any two adjacent operating power points, if the SOC is not in the preset range, determining the operating power of the fuel battery pack and the lithium battery pack according to the relative relation between the 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 state of charge SOC is not in the preset range, the state of charge SOC of the lithium battery may be lower and need to be charged or higher, and larger power can be supplied. If the state of charge (SOC) is smaller than the first preset value, it is indicated that the available electric quantity of the lithium battery pack is low and charging is needed, the operating power (Pfc) of the fuel battery pack can select a minimum operating power point higher than the total load demand, and the lithium battery pack can absorb the redundant power of the fuel battery pack for charging. If the state of charge SOC is greater than the second predetermined value, it indicates that the available charge of the lithium battery pack is high, the lithium battery pack may be powered with a large operating power, the operating power of the fuel battery pack Pfc may select a maximum operating power point that is lower than the total load demand, and 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. The lithium battery pack can be rapidly charged by utilizing the redundant power of the fuel battery pack at low electric quantity, and can also assist the fuel battery to supply power at high electric quantity. For example, the first preset value may be 20%, the second preset value may be 80%, and the preset range is less than 80% and greater than 20%.
S304, under the condition that the total load required power Pload is between any two adjacent operating power points, if the state of charge SOC is in a preset range, determining the operating power of the fuel battery pack and the operating power of the lithium battery pack according to the relative relation between the total load required power Pload and the intermediate value of the two adjacent operating power points.
Specifically, the median is the median of any two operating power points, illustratively, the median of the 0% rated power point and the 25% rated power point is the 12.5% rated power point. The fuel cell stack selects the largest of all operating power points below the total load demand, with the total load demand between any two adjacent operating power points and less than the median of the two operating power points. The operating power Pbatt of the lithium battery pack is equal to the total load demand minus the operating power Pfc of the fuel cell stack. Illustratively, if the total load demand is 27% of the rated power Pefc of the fuel cell stack and the state of charge SOC of the lithium battery is within the preset range, since the total load demand is between 25% and 50% of the rated power point and less than 37.5% of the rated power point, the operating power Pfc of the fuel cell stack is equal to 25% of the rated power point, and the operating power Pbatt of the lithium cell 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 is 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 excess power of the fuel cell stack for charging. Illustratively, if the total load demand is 72% of the rated power Pefc of the fuel cell stack and the state of charge SOC of the lithium battery is within the preset range, since the total load demand is between the 50% rated power point and the 75% rated power point and is not less than the 62.5% rated power point, the operating power Pfc of the fuel cell stack is equal to the 75% rated power point, and the lithium battery stack absorbs the remaining power of the fuel cell stack for charging itself.
The energy scheduling method for the offshore floating hydrogen plant, provided by the embodiment, can collect the total load demand power and the charge state of the lithium battery pack, when the load demand power reaches the operating power point of the fuel cell, only the fuel battery pack supplies power, and when the load demand power is not equal to the operating power point of the fuel cell, the operating power of the fuel battery pack and the lithium battery pack is determined according to the charge state and the total load demand power, so that the energy scheduling for the offshore floating hydrogen plant is realized.
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 apparatus of an electric power system according to an embodiment of the present invention, and referring to fig. 5, an energy scheduling apparatus 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 the total load demand power of electric appliances and a propulsion motor in the power system and the charge state of a lithium battery pack; the first power determination module 502 is used to determine that the total load demand power is provided by the fuel cell stack alone if the total load demand power reaches the operating power point of the fuel cell; the second power determination 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 demanded power when the total load demanded 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.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. An energy scheduling method for an offshore floating hydrogen plant, characterized in that an electric power system comprises: the system comprises a power supply module, a direct current distribution module, an alternating current distribution module, a propulsion motor, an electric appliance and an energy management module; the power supply module comprises a fuel battery pack and a lithium battery pack and is used for providing power; the direct current distribution module is electrically connected with the fuel battery pack and the lithium battery pack respectively and is used for converting direct current input by the fuel battery pack and the lithium battery pack 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 used for supplying power to the electrical appliance; the energy management module is respectively electrically connected with the power supply module, the direct current distribution module, the alternating current distribution module and the electrical 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 electrical appliance;
the energy scheduling method comprises the following steps:
collecting total load demand power of the electrical appliances and the propulsion motor in the power system and the state of charge of the lithium battery pack;
the total load demand power is supplied by the fuel cell stack alone in a case where the total load demand power reaches an operating power point of the fuel cell;
and under the condition that the total load required power is between any two adjacent operating power points, determining the operating power of the fuel battery pack and the lithium battery pack according to the state of charge and the total load required power.
2. The method for energy scheduling of an offshore floating hydrogen plant according to claim 1, wherein the total load demand power is provided by the fuel cell stack alone, comprising:
the operating power of the fuel cell stack is equal to the operating power point, the operating power of the lithium cell stack is 0, and the operating power point is equal to the total load demand power.
3. The method of claim 1, wherein determining the operating power of the fuel cell stack and the lithium cell stack based on the state of charge and the total load demand power comprises:
determining the operating power of the fuel battery pack and the lithium battery pack according to the relative relation between the state of charge and the boundary point of the preset range under the condition that the state of charge is not in the preset range;
and under the condition that the state of charge is within the preset range, determining the operating power of the fuel battery pack and the lithium battery pack according to the relative relation between the total load required power and the intermediate value of two adjacent operating power points.
4. The energy scheduling method of the offshore floating hydrogen plant according to claim 3, wherein determining the operating power of the fuel cell stack and the lithium cell stack according to the relative relationship between 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 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;
when the state of charge is larger than a second preset value, the operation power of the fuel cell stack is the maximum operation power point lower than the total load demand, and the operation power of the lithium cell stack is equal to the total load demand minus the operation power of the fuel cell stack; wherein the first preset value is smaller than the second preset value.
5. The energy scheduling method of the offshore floating hydrogen plant according to claim 3, wherein determining the operating power of the fuel cell stack and the lithium cell stack according to the relative relationship between the total load demand power and the intermediate value of the two adjacent operating power points comprises:
in the case where the total load demand is less than the intermediate value, the fuel cell stack selects the maximum operating power point that is lower than 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 the minimum operating power point higher than the total load demand, and the lithium cell stack absorbs excess power of the fuel cell stack for charging.
6. The method for energy scheduling of an offshore floating hydrogen plant according to claim 1, characterized in that the operating power points comprise: 0. 25% rated power point, 50% rated power, 75% rated power, and 100% rated power.
7. The energy scheduling method of an offshore floating hydrogen plant according to claim 4, wherein the preset range is 20% to 80%, the first preset value is 20%, and the second preset value is 80%.
8. The energy scheduling method of the offshore floating hydrogen plant according to claim 1, wherein the lithium battery pack is charged daily by at least one of a wind power plant, a tidal power plant and a photovoltaic power plant;
the fuel cell stack is supplied with hydrogen from the offshore floating hydrogen plant.
9. An energy scheduling apparatus of an electric power system, comprising:
the acquisition module is used for acquiring the total load demand power of the electric appliance and the propulsion motor in the 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 by the fuel cell stack alone, in a case where the total load demand power reaches an operating power point of the fuel cell;
and the second power determination module is used for determining the operating power of the fuel battery pack and the lithium battery pack according to the state of charge and the total load required power under the condition that the total load required power is between any two adjacent operating power points.
10. An offshore floating hydrogen plant, characterized in that it comprises an energy scheduling device of the power system according to claim 9.
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