CN117639069A - Light-hydrogen-storage comprehensive energy system suitable for remote agriculture and animal husbandry area - Google Patents
Light-hydrogen-storage comprehensive energy system suitable for remote agriculture and animal husbandry area Download PDFInfo
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- 238000003860 storage Methods 0.000 title claims abstract description 94
- 239000001257 hydrogen Substances 0.000 claims abstract description 99
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 99
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 97
- 239000000446 fuel Substances 0.000 claims abstract description 60
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
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- 239000007787 solid Substances 0.000 claims abstract description 10
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 228
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- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 3
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
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- 239000001301 oxygen Substances 0.000 claims description 3
- 230000002194 synthesizing effect Effects 0.000 claims description 3
- MYVIATVLJGTBFV-UHFFFAOYSA-M thiamine(1+) chloride Chemical compound [Cl-].CC1=C(CCO)SC=[N+]1CC1=CN=C(C)N=C1N MYVIATVLJGTBFV-UHFFFAOYSA-M 0.000 claims description 3
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Abstract
The invention relates to the technical field of energy storage and application, and discloses a light-hydrogen-storage integrated energy system suitable for remote agriculture and animal husbandry, which comprises a control system, a photovoltaic subsystem, an electrolytic cell, a fuel cell, a hydrogen storage subsystem, a load, a water circulation subsystem and other matched equipment; the control system is used for controlling the electrolytic cell, the fuel cell, the hydrogen storage subsystem, other matched equipment and hydrogen delivery pipeline valves and collecting real-time state information of each equipment; the photovoltaic subsystem comprises a photovoltaic power generation unit, an inverter unit, a photovoltaic power station weather station, a measurement and control unit and electrical equipment; the hydrogen storage subsystem comprises compressed gaseous hydrogen storage, low-temperature liquid hydrogen storage and solid hydrogen storage; the load includes an electrical load, a hydrogen load, and a gas load; the other matched equipment is power electronic equipment. The integrated energy system of the invention provides reliable, efficient, clean and sustainable energy supply for off-grid areas.
Description
Technical Field
The invention relates to the technical field of energy storage and application, in particular to a light-hydrogen-storage comprehensive energy system suitable for remote agriculture and animal husbandry.
Background
In order to solve the problem of common power service of farmers and herders in remote areas, respond to the notification of national energy and power bureau on the power construction task arrangement in Qinghai province and no-electricity areas of the national energy bureau, the limitation of centralized power supply of a large power grid is made up, and the Qinghai province sequentially builds and independently operates off-grid solar photovoltaic power stations from 2001, so that the problems of power shortage and no power in the areas are solved. But most of the grid photovoltaic power stations are simple in structure and operation control, power supply for 24 hours in the whole day is difficult to realize, and the problem of power supply quality and power supply reliability is serious due to poor operation environment and lack of professional operation and maintenance.
Most of the Qinghai Tibetan area is located in the natural protection area of Sanjiang river, is an important ecological barrier in China and even in the world, has heavy ecological environment protection and construction tasks, and is limited in power grid development. On the other hand, with the implementation of projects such as resource development, small town construction, centralized arrangement of farmers and herding citizens, new rural construction, home appliance rural areas and the like, the power supply range and the power load increase speed are faster, the early construction and transformation standards of off-grid photovoltaic power stations are obviously lower, the contradiction between ecological environment protection and energy consumption requirements of users is increasingly prominent, and the energy transformation requirement scale is continuously expanded.
Successful energy conversion means that the supply safety, economy and environmental protection are combined with innovative and intelligent climate protection. In the global new technological revolution and industrial revolution, advanced technologies such as the internet, the internet of things, big data, artificial intelligence and the like are fused with the trend of the energy industry, and the development of new technologies, new modes and new states of the energy industry is being promoted. The comprehensive energy system is characterized by deep combination of new energy technology and information technology, and is a distributed and open shared network based on renewable energy.
Disclosure of Invention
In view of the above, the invention provides a light-hydrogen-storage integrated energy system suitable for remote agriculture and animal husbandry areas, which solves the clean and efficient energy supply requirement of the remote agriculture and animal husbandry areas and provides reliable, efficient, clean and sustainable energy supply for remote agriculture and animal husbandry areas, isolated islands, frontier guard posts and other off-grid areas.
In order to solve the technical problems, the invention adopts the following technical scheme:
in one aspect, the invention provides a light-hydrogen-storage integrated energy system suitable for remote agriculture and animal husbandry, comprising a control system, a photovoltaic subsystem, an electrolytic cell, a fuel cell, a hydrogen storage subsystem, a load and other matched equipment; wherein,
The control system is used for controlling the electrolytic cell, the fuel cell, the hydrogen storage subsystem, other matched equipment and the hydrogen transmission pipeline valve and collecting real-time state information of the photovoltaic subsystem, the electrolytic cell, the fuel cell, the hydrogen storage subsystem, the load and other matched equipment;
the photovoltaic subsystem comprises a photovoltaic power generation unit, an inverter unit, a photovoltaic power station weather station, a measurement and control unit and electrical equipment, wherein the photovoltaic power generation unit comprises a string and a combiner box, the inverter unit comprises a direct current power distribution cabinet and an inverter, and the measurement and control unit comprises an electric energy metering device, an electric energy quality analysis device and a public connection point measurement and control device;
the electrolytic cell is any one of an alkaline electrolytic cell AEC, a solid oxide electrolytic cell SOEC and a proton exchange membrane electrolytic cell PEMEC, and is used for introducing direct current to a cathode and an anode to electrolyze water into hydrogen and oxygen.
The fuel cell is one of an alkaline fuel cell AFC, a phosphoric acid fuel cell PAFC, a solid oxide fuel cell SOFC, a molten carbonate fuel cell MCFC and a proton exchange membrane fuel cell PEMFC, and is used for respectively introducing oxide and fuel to a cathode and an anode, and generating a combination reaction in the cell to generate electric energy;
The hydrogen storage subsystem comprises compressed gaseous hydrogen storage, low-temperature liquid hydrogen storage and solid hydrogen storage, and is used for improving the volume energy density during hydrogen storage and reducing the volume occupied by hydrogen gas;
the load includes an electrical load, a hydrogen load, and a gas load;
the other matched equipment is power electronic equipment and is used for converting the electric energy form and providing electric energy for each equipment.
Preferably, in the above light-hydrogen-storage integrated energy system suitable for remote agriculture and animal husbandry, the light-hydrogen-storage integrated energy system further comprises a water circulation subsystem for collecting water generated by the fuel cell and supplying the water to the electrolytic cell.
Preferably, in the above light-hydrogen-storage integrated energy system suitable for remote agriculture and animal husbandry, the conversion electric energy form adopts P2G technology, and the P2G technology comprises electric hydrogen conversion energy and electric natural gas conversion, wherein the electric natural gas conversion process is to further convert hydrogen energy generated by electric hydrogen conversion energy into natural gas.
In another aspect, the invention provides an objective function of an optical-hydrogen-storage integrated energy system suitable for a remote agriculture and animal husbandry area, comprising an integrated energy system operation cost, an environment cost and an integrated energy system integrated operation cost; wherein,
The comprehensive energy system operation cost comprises ESSs operation cost, natural gas network operation cost and comprehensive energy system operation energy loss penalty cost; the operation cost of the comprehensive energy system is as follows: f (f) 1 ＝f 11 +f 12 +f 13 Wherein f 11 For ESSs running cost, f 12 For the natural gas network operation cost, f 13 Penalty cost for operating energy loss for the integrated energy system;
the ESSs are operated at the following cost:
wherein R is t Supplying cost coefficient r for ESSs to comprehensive energy system t A cost factor for the integrated energy system to power the ess,active power delivered to the integrated energy system for the period t ESSs +.>The active power which is transmitted to ESSs by the comprehensive energy system in the t period is given, and Deltat is the step length;
the natural gas network operation cost is as follows:
wherein K is Loss Is weight coefficient, K is more than or equal to 0 Loss ≤1，Penalty cost for cell operation energy loss, < >>Penalty cost for fuel cell operation energy loss, < >>Penalty cost for operating an electric power plant, < >>Penalty costs for gas turbine operation energy loss;
the said
The said
The said
The said
Wherein alpha is E2H Alpha is the efficiency of electrolytic hydrogen production H2E For fuel cell power generation efficiency, alpha H2G Efficiency for synthesizing natural gas from hydrogen, alpha MT For generating efficiency of gas turbine, N EL Is an electrolytic cellNumber of devices, N FC N is the number of fuel cell devices H2G For the total number of the electric conversion devices, N MT Is the number of the gas turbines to be used,for the power consumed by the ith electrolytic cell during period t,/->Power generation for fuel cell, < >>Generating natural gas power for P2G devices,/->Generating power for the gas turbine;
the environmental cost is:
wherein,average CO for unit power supply of comprehensive energy system 2 Emission coefficient, < >>Generating CO for MT 2 Emission coefficient, < >>Is CH 4 CO of (c) 2 Capturing coefficients;
the comprehensive operation cost of the comprehensive energy system is as follows:
wherein omega 1 +ω 2 ＝1，0≤ω 1 ，ω 2 ≤1，f 1 max For the maximum operating cost of the integrated energy system,to the maximum environmental cost of the comprehensive energy system omega 1 For the weight coefficient omega of the operation cost of the comprehensive energy system 2 The environmental cost weight coefficient of the comprehensive energy system is obtained.
On the other hand, the invention also provides a constraint of the light-hydrogen-storage comprehensive energy system suitable for remote agriculture and animal husbandry, which comprises hydrogen storage constraint, charge-discharge constraint, natural gas network tide constraint, electric power network constraint and other constraints; wherein,
the hydrogen storage constraint is as follows:
E T ＝E 0 (3)；
the formula (1) is that the charging and discharging power of the hydrogen energy storage system is balanced, the formula (2) is the limitation of the maximum capacity and the minimum capacity, and the formula (3) is that the starting state of the comprehensive energy system in the next scheduling period is consistent with the starting state of the previous scheduling period; in the middle of For the hydrogen energy stored by the hydrogen storage system in the period t, P t 1H Hydrogen energy consumed by hydrogen load of t-period comprehensive energy system, P t 2H Hydrogen energy consumed for electric conversion +.>As a maximum capacity limit value, the maximum capacity limit value,E H is the minimum capacity limit;
the charge-discharge constraint is as follows:
in the middle ofP EL For the minimum power of the electrolytic cell,for the maximum power of the electrolytic cell,P FC for minimum power of fuel cell, < > for>For the maximum power of the fuel cell,P H2G for the minimum power of the electric switching device, +.>Maximum power of electric conversion device, B EL For the electrolytic cell device set, B FC For fuel cell device assembly, B H2G For the electric switching device set, < >>And->Is a 0-1 variable.
Preferably, in the above optical-hydrogen-storage integrated energy system suitable for remote agriculture and animal husbandry, the natural gas network power flow constraint includes an air pressure constraint, a node flow balance constraint, an active pipeline internal natural gas network power flow constraint and a passive pipeline internal natural gas network power flow constraint; wherein,
the air pressure constraint is as follows:
in the middle ofB is the air pressure of the ith node in the air network in the period t gas Is the air pressure node set, P i max At maximum air pressure, P i m Is the minimum air pressure;
the node traffic balance constraint is:
in the middle ofFor the inflow of natural gas from the gas source to node i during period t, +. >CH injected into i node for electric conversion device 4 ，/>CH consumed for MT 4 ，/>For natural gas load, +.>Natural gas flowing to other nodes of the gas network for the i node;
the natural gas network tide constraint in the active pipeline is as follows:
βP in ＝P out (8)
Q min ≤Q ij ≤Q max (10)；
p in the formula in And P Out Is the air pressure at the inlet and outlet of the natural gas compressor, beta is the compression ratio, beta min Beta, the minimum compression ratio max For maximum compression ratio, Q ij Natural gas flow, Q, delivered for active natural gas pipeline min To minimize natural gas flow, Q max Is the maximum natural gas flow;
the natural gas network tide constraint in the passive pipeline is as follows:
in the middle ofK being the natural gas flow of the pipeline ij in the period t ij Is the tide parameter of the natural gas pipeline, S ij，t Is the natural gas flow direction in the natural gas pipeline ij, and the direction from i to j is positive,/is the direction from i to j>Is the air pressure of the air network node i->Is the air pressure of the air network node j, wherein,
preferably, in the above optical-hydrogen-storage integrated energy system suitable for remote agriculture and animal husbandry, the power network constraint includes an integrated energy system tide constraint and a power exchange constraint; wherein,
the flow constraint of the comprehensive energy system is as follows:
wherein r is ij And x ij G is the branch impedance j And b j Is the admittance of the node to ground, and r ij 、x ij 、g j And b j All are constant, V i And V j For node voltage, I ij And I i For the branch current, P jk 、P ij 、Q jk And Q ij For branch tidal current, p j 、q j Injecting power for the node;
the power exchange constraint is:
k in the formula in Is the proportionality coefficient of the segmentation weight coefficient and ESSs charge state, P in，max 、Q in，max Constraint upper limit for power exchange, -Q out，max A lower limit value for power exchange constraint;
the gas turbine is restrained when climbing a slope:
P MT (t)-P MT (t-1)≤P up，MT (20)；
p in the formula up，MT To limit the climbing power rising speed, P MT (t) is the climbing power in the period t, P MT (t-1) is the climbing power in the period t-1;
the gas turbine is constrained when sliding down:
P MT (t-1)-P MT (t)≤P down，MT (21)；
p in the formula down，MT P is the restriction of the power rising rate of landslide MT (t) is landslide power at time t, P MT (t-1) is the landslide power during period t-1;
the photovoltaic output constraint is as follows:
in the middle ofFor the photovoltaic t period out lower limit value, < ->And outputting a force upper limit value for the photovoltaic t period.
Preferably, in the above optical-hydrogen-storage integrated energy system suitable for remote agriculture and animal husbandry, the natural gas network tide constraint further comprises linearization conversion, specifically:
s1: will S ij，t Conversion to 0-1 auxiliary variable mu ij，t Sum mu ji，t ，μ ij，t Is 1 mu ji，t When the flow is 0, the actual direction of the air network flow flows from the i node to the j node, and the time subscript t and mu is omitted because the flow analysis principle of each period is the same ij Sum mu ji The constraints of (2) are: mu (mu) ij +μ ji ＝1；
Air network tide direction variable S ij The constraints of (2) are: s is S ij ＝μ ij -μ ji ；
When the air network tide flows from i to j, mu is added ij ＝1，μ ji ＝0，S ij =1 carry over to formula (11), get：
In the middle ofThe maximum passable flow of the ij pipeline is set;
when the air network tide flows from j to i, mu is added ji ＝1，μ ij ＝0，S ij = -1 brings into formula (11), yielding:
s2: will be in S1And P i And P j Is converted by piecewise linearization of the relation of>Equally dividing into 2n parts:
mu in the middle ij，m And mu ji，m Is an auxiliary variable of 0-1, and
wherein 0 to Q ij，max Aliquoting inton parts, to obtain Q ij，m Will Q ij，m Squaring to obtain
And Q is ij，m And->Are all constants;
s3: will beAnd->Obtaining:
in the middle ofAnd->Is the square of the air pressure at node i, j.
Preferably, in the above light-hydrogen-storage integrated energy system suitable for a remote agriculture and animal husbandry, the power network constraint further includes linearization conversion, wherein the linearization conversion is a second order cone relaxation method, specifically:
s1: will beAnd performing second order cone relaxation conversion to obtain:
s2: equivalent conversion of equation (30) to a standard form of second order cone relaxation of the type 2 norm expression yields:
and then will beSubstituting the formula (13) - (14) to obtain a converted optimal power flow constraint equation:
the invention provides a light-hydrogen-storage comprehensive energy system suitable for remote agriculture and animal husbandry, which has the following advantages:
(1) The light-hydrogen-storage comprehensive energy system suitable for the remote agriculture and animal husbandry comprises a control system, a photovoltaic subsystem, an electrolytic cell, a fuel cell, a hydrogen storage subsystem, a load and other matched equipment, and is used for providing reliable, efficient, clean and sustainable energy supply for off-grid areas such as the remote agriculture and animal husbandry, an isolated island, a frontier guard post and the like, and promoting the popularization and development of intelligent energy in the remote areas;
(2) The light-hydrogen-storage comprehensive energy system suitable for the remote agriculture and animal husbandry area determines that different constraint boundaries exist in each link, determines an objective function of the operation of the comprehensive energy system and corresponding state variables and control variables, can better realize the coordination balance of the operation economy and environmental protection of the comprehensive energy system, and is more suitable for a clean and efficient energy supply system in the remote agriculture and animal husbandry area.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the architecture of the light-hydrogen-storage integrated energy system of the present invention suitable for use in remote farming and pasture areas;
FIG. 2 is a schematic diagram of the architecture of a photovoltaic subsystem in a light-hydrogen-storage integrated energy system of the present invention suitable for use in remote farming and pasture areas;
FIG. 3 is a schematic diagram of the electrical load distribution of the light-hydrogen-storage integrated energy system 24h of the present invention adapted for use in remote farming and pasture areas;
FIG. 4 is a schematic diagram of the hydrogen load distribution of the light-hydrogen-storage integrated energy system 24h of the present invention suitable for use in remote farming and pastoral areas;
FIG. 5 is a schematic diagram of the gas load distribution of the light-hydrogen-storage integrated energy system 24h of the present invention suitable for use in remote farming and pastoral areas
FIG. 6 is a schematic diagram of a natural gas compressor of the light-hydrogen-storage integrated energy system of the present invention adapted for use in remote farming and pasture areas;
FIG. 7 is a schematic diagram of the present invention for piecewise linearization in a light-hydrogen-storage integrated energy system for use in remote farming and pasture areas;
FIG. 8 is a graph of photovoltaic output prediction in a light-hydrogen-storage integrated energy system suitable for use in remote farming and pastoral areas in accordance with the present invention.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
In a first aspect, the present invention provides an integrated light-hydrogen-storage energy system suitable for use in remote farming and pastoral areas, as shown in fig. 1, comprising a control system and photovoltaic, electrolysis, fuel cell, hydrogen storage, load, other ancillary equipment and water circulation subsystems.
In some embodiments of the invention, the control system is used to control the electrolytic cell, fuel cell, hydrogen storage subsystem, other ancillary equipment, and hydrogen transfer piping valves and to collect real-time status information of the photovoltaic subsystem, electrolytic cell, fuel cell, hydrogen storage subsystem, load, and other ancillary equipment.
In some embodiments of the present invention, as shown in fig. 2, the photovoltaic subsystem includes a photovoltaic power generation unit, an inverter unit, a photovoltaic power station weather station, a measurement and control unit, and an electrical device, where the photovoltaic power generation unit includes a string and a combiner box, the inverter unit includes a dc power distribution cabinet and an inverter, the measurement and control unit includes an electric energy metering device, an electric energy quality analysis device, and a common connection point measurement and control device, and the electrical device is a space switch.
In some embodiments of the invention, the electrolytic cell is any one of an alkaline electrolytic cell AEC, a solid oxide electrolytic cell SOEC and a proton exchange membrane electrolytic cell PEMEC, preferably the alkaline electrolytic cell AEC, and mainly comprises a cathode, an anode and an electrolyte, and water is electrolyzed into hydrogen and oxygen by introducing direct current to the cathode and the anode.
In some embodiments of the invention, the fuel cell is one of an alkaline fuel cell AFC, a phosphoric acid fuel cell PAFC, a solid oxide fuel cell SOFC, a molten carbonate fuel cell MCFC and a proton exchange membrane fuel cell PEMFC, preferably a proton exchange membrane fuel cell PEMFC, and has excellent dynamic regulation performance, can completely meet the requirements of a combined system, and is used for respectively introducing oxide and fuel into a cathode and an anode, and generating electric energy through a combination reaction in the cell.
In some embodiments of the invention, the hydrogen storage subsystem includes compressed gaseous hydrogen storage, liquid hydrogen storage (e.g., metal hydrides, carbon materials) and solid hydrogen storage, preferably compressed gaseous hydrogen storage and low temperature liquid hydrogen storage, more preferably compressed gaseous hydrogen storage, to reduce the volume occupied by the hydrogen gas by increasing the pressure to increase the volumetric energy density of the hydrogen gas when stored.
The effect of the hydrogen storage mode on energy loss and conversion efficiency is shown in the following table:
TABLE 1
As can be seen from the above Table 1, the compressed gaseous hydrogen storage mode has relatively less energy loss and higher conversion efficiency, and the activated carbon also has higher efficiency under the low temperature condition, and in the light-hydrogen-storage integrated energy system of the invention, the power generation and hydrogen production time is longer, so that the compressed gaseous hydrogen storage mode with lower energy loss and higher efficiency is more suitable for the light-hydrogen-storage integrated energy system of the remote agriculture and animal husbandry area.
In some embodiments of the invention, as shown in fig. 3-5, the loads include an electrical load, a hydrogen load, and a gas load, wherein the electrical load of the integrated energy system is distributed more evenly over 24 hours of the day, the hydrogen load is consumed more at 7-8 hours, the gas load is a natural gas load at 10-14 hours, the gas load is consumed more at 9-12 hours, and the consumption is lower at 13-16 hours.
In some embodiments of the present invention, other supporting devices are power electronic devices, which can flexibly transform the form of electric energy and provide electric energy for each device, so as to improve the quality of electric energy, and the power electronic device combined control system can quickly collect the real-time state of the system, and meanwhile, the control system can control the power electronic device to adjust the input and output electric power of each device.
In some embodiments of the invention, the conversion of the electric energy form adopts a P2G technology, the P2G technology process is divided into two types of conversion of electric hydrogen energy and electric natural gas, wherein the electric natural gas conversion process is to further convert the hydrogen energy generated by the electric hydrogen energy into natural gas, the electric hydrogen energy conversion process is to convert the electric energy into the hydrogen energy through electrolysis of water, the generated hydrogen energy cannot be directly injected into a natural gas network like the natural gas, the generated hydrogen energy needs to be pressurized and stored in a hydrogen storage tank, the conversion rate can reach 75% -85%, the electric natural gas conversion process is methanation, the conversion rate is only 45% -65%, and the generated natural gas can be directly injected into the existing natural gas network, so that the investment cost is low.
In some embodiments of the invention, the electrolytic cell continuously consumes water in the electrolytic process, the water must be replenished in time, the water generated by the fuel cell also needs to be discharged in time, the water circulation system can collect the water generated by the fuel cell and supply the collected water to the electrolytic cell, the water circulation utilization is realized, and the dependence of the comprehensive energy system on external water sources is reduced.
In a second aspect, the present invention provides an objective function of an optical-hydrogen-storage integrated energy system suitable for use in remote farming and pasture areas, comprising integrated energy system operating costs, environmental costs, and integrated energy system integrated operating costs; the comprehensive energy system operation cost comprises ESSs operation cost, natural gas network operation cost and comprehensive energy system operation energy loss penalty cost.
The operation cost of the comprehensive energy system is as follows:
f 1 ＝f 11 +f 12 +f 13 ，
wherein f 11 For ESSs running cost, f 12 For the natural gas network operation cost, f 13 Penalty cost for operating energy loss for the integrated energy system;
ESSs running cost is:
wherein R is t Supplying cost coefficient r for ESSs to comprehensive energy system t A cost factor for the integrated energy system to power the ess,active power delivered to the integrated energy system for the period t ESSs +. >For the active power which is transmitted to ESSs by the t-period comprehensive energy system, delta t is the step length, and the cost coefficient can be assigned in stages according to the requirement;
the natural gas network operation cost is as follows:
wherein C is n1 Cost coefficient for directly consuming and storing natural gas for comprehensive energy system, C n2 The cost coefficients of natural gas are stored for the integrated energy system,power obtained from natural gas storage for t-period integrated energy system, +.>The power transmitted to the natural gas storage equipment by the comprehensive energy system in the t period is that H is the high heat value of the natural gas and is generally 10.8 (KW.h)/m 3 ；
The operation energy loss punishment cost of the comprehensive energy system is as follows:
wherein K is Loss The weight coefficient represents the importance degree of the system to the energy loss, and K is more than or equal to 0 Loss ≤1，Penalty cost for cell operation energy loss, < >>Penalty cost for fuel cell operation energy loss, < >>Penalty cost for operating an electric power plant, < >>Penalty costs for gas turbine operation energy loss;
/>
wherein alpha is E2H Alpha is the efficiency of electrolytic hydrogen production H2E For fuel cell power generation efficiency, alpha H2G Efficiency for synthesizing natural gas from hydrogen, alpha MT For generating efficiency of gas turbine, N EL N is the number of electrolytic cell devices FC N is the number of fuel cell devices H2G For the total number of the electric conversion devices, N MT Is the number of the gas turbines to be used,for the power consumed by the ith electrolytic cell during period t,/->Power generation for fuel cell, < >>Generating natural gas power for P2G devices,/->Generating power for the gas turbine;
in the integrated energy system, harmful gases are not generated in the conversion of various energy forms, so the environmental cost is mainly composed of CO 2 The emission amount is formed, and the environmental cost is as follows:
wherein,average CO for unit power supply of comprehensive energy system 2 Emission coefficient, < >>Generating CO for MT 2 Emission coefficient, < >>Is CH 4 CO of (c) 2 Capturing coefficients;
according to the analysis, the comprehensive energy system optimizing operation objective function comprehensively considering economy and environmental protection is as follows:
wherein omega 1 +ω 2 ＝1，0≤ω 1 ，ω 2 ≤1，f 1 max For the maximum operating cost of the integrated energy system,to the maximum environmental cost of the comprehensive energy system omega 1 For the weight coefficient omega of the operation cost of the comprehensive energy system 2 And assigning the running cost and the environment cost of the comprehensive energy system for the environmental cost weight coefficient of the comprehensive energy system by a per unit value method.
In a third aspect, the present invention provides a constraint condition for an optical-hydrogen-storage integrated energy system suitable for use in remote farming and pastoral areas, including hydrogen storage constraints, charge-discharge constraints, natural gas network flow constraints, power network constraints, and other constraints.
The hydrogen storage constraint is:
F T ＝E 0 (3)；
the formula (1) represents the balance of the charge and discharge power of the hydrogen energy storage system, the formula (2) represents the limitation of the maximum capacity and the minimum capacity so as to ensure the normal operation of the hydrogen energy storage system, and the formula (3) represents the stable operation of the comprehensive energy system by taking the scheduling period as a unit, namely the comprehensive energy system is arranged at the next timeThe starting state of each scheduling period is consistent with the starting state of the previous scheduling period; in the middle ofFor the hydrogen energy stored by the hydrogen storage system in the period t, P t 1H Hydrogen energy consumed by hydrogen load of t-period comprehensive energy system, P t 2H Hydrogen energy consumed for electric conversion +.>As a maximum capacity limit value, the maximum capacity limit value,E H is the minimum capacity limit;
the charge and discharge constraints are as follows:
in the middle ofP EL For the minimum power of the electrolytic cell,for the maximum power of the electrolytic cell,P FC for minimum power of fuel cell, < > for>For the maximum power of the fuel cell,P H2G for the minimum power of the electric switching device, +.>Maximum power of electric conversion device, B EL For the electrolytic cell device set, B FC For fuel cell device assembly, B H2G For the electric switching device set, < >>And->And the variable is 0-1, which is used as logic constraint to ensure that the electrolytic hydrogen production of the comprehensive energy system and the fuel cell are not performed simultaneously.
The natural gas network tide constraints comprise air pressure constraints, node flow balance constraints, active pipeline natural gas network tide constraints and passive pipeline natural gas network tide constraints;
The air pressure constraint is as follows:
in the middle ofB is the air pressure of the ith node in the air network in the period t gas Is the air pressure node set, P i max At maximum air pressure, P i m Is the minimum air pressure;
at any moment, for any node of the gas network, the inflow amount of natural gas is equal to the outflow amount, and the node flow balance constraint is as follows:
in the middle ofFor the inflow of natural gas from the gas source to node i during period t, +.>CH injected into i node for electric conversion device 4 ，/>CH consumed for MT 4 ，/>For natural gas load, +.>Natural gas flowing to other nodes of the gas network for the i node;
the active pipeline refers to a pipeline provided with a compressor, and as shown in fig. 6, the pipeline has the capability of automatically adjusting the output air pressure of the pipeline through the compressor, so that the natural gas flow in the pipeline can be controlled; in the process of conveying natural gas through a natural gas network, pressurization treatment is carried out firstly, so that on one hand, the loss of air pressure caused by various losses of a natural gas pipeline can be compensated, and on the other hand, the air pressure of a natural gas pipeline node is improved, and the natural gas flow conveyed by the natural gas pipeline can be increased; the energy consumed by the compressor can be directly provided by the natural gas conveyed, or the energy can be selected to be used, and the energy consumed by the compressor is 3% -5% of the energy consumed by the natural gas conveyed;
For the active pipeline where the compressor is located, the air pressure at two ends and the delivered natural gas flow are constrained as follows:
βP in ＝P out (8)
Q min ≤Q ij ≤Q max (10)；
p in the formula in And P out Is the air pressure at the inlet and outlet of the natural gas compressor, beta is the compression ratio, beta min Beta, the minimum compression ratio max For maximum compression ratio, Q ij Natural gas flow, Q, delivered for active natural gas pipeline min To minimize natural gas flow, Q max Is the maximum natural gas flow;
for passive pipelines, the natural gas flow delivered by the pipeline is almost only related to the gas pressure at two ends of the pipeline, and the natural gas network flow constraint in the passive pipeline is as follows:
in the middle ofFor the natural gas flow of the pipeline ij (direction from i to j) in period t, K ij Is a natural gas pipeline tide parameter, which is complex and is simplified into a constant related to the pipeline length and the pipeline diameter, S ij，t Is the natural gas flow direction in the natural gas pipeline ij, and the direction from i to j is positive,/is the direction from i to j>Is the air pressure of the air network node i->Is the air pressure of the air network node j, wherein,
from the above expression, the passive pipeline natural gas flow direction is necessarily from the node with high air pressure to the node with low air pressure; whereas for the entire natural gas network (including both active and passive pipelines), natural gas flow always flows from the gas source and ultimately to the natural gas load.
The power network constraint comprises a comprehensive energy system tide constraint and a power exchange constraint; the flow constraint of the comprehensive energy system is as follows:
wherein r is ij And x ij G is the branch impedance j And b j Is the admittance of the node to ground, and r ij 、x ij 、g j And b j All are constant, V i And V j For node voltage, I ij And I i For the branch current, P jk 、P ij 、Q jk And Q ij For branch tidal current, p j 、q j Injecting power for the node; because the comprehensive energy system is a low-voltage network, the admittance to the ground g j And b j The influence on the system power flow is small, and the algorithm is simplified and can be ignored in the formula (13)And->Formulas (13) - (17) are constraint equations which are necessary for power flow analysis of the power grid, and formula (18) is a constraint condition which is specific to the comprehensive energy system and is determined by the power load, the distributed power supply and other internal parameters of the comprehensive energy system;
the power exchange constraints of the integrated energy systems and ESSs are mainly determined by two aspects: when ESSs are integratedWhen the energy system supplies power, there is a power exchange constraint upper limit P in，max The power exchange constraint is determined by the power flow constraint of the comprehensive energy system, namely under the condition that equations (13) - (18) are satisfied, ESSs supplement the power consumption requirement of the comprehensive energy system without reaching the upper limit constraint P in，max When the integrated energy system supplies power to the ess (i.e. the integrated energy system has residual electric energy), the power exchange constraint is mainly determined by the state of charge of the ess, and the power upper limit constraint of the integrated energy system supplying power to the ess can be approximately obtained according to the segmentation weight coefficient, namely the power exchange constraint is as follows:
K in the formula in Is the proportionality coefficient of the segmentation weight coefficient and ESSs charge state, P in，max 、Q in，max Constraint upper limit for power exchange, -Q out，max The lower limit value is constrained for power exchange.
Other constraints include gas turbine climbing constraints, landslide constraints, and photovoltaic output constraints; wherein, constraint when gas turbine climbs slope is:
P MT (t)-P MT (t-1)≤P up，MT (20)；
p in the formula up，MT To limit the climbing power rising speed, P MT (t) is the climbing power in the period t, P MT (t-1) is the climbing power in the period t-1;
the gas turbine is constrained when sliding down:
P MT (t-1)-P MT (t)≤P down，MT (21)；
p in the formula down，MT P is the restriction of the power rising rate of landslide MT (t) is landslide power at time t, P MT (t-1) is the landslide power during period t-1;
the photovoltaic output constraint is:
in the middle ofFor the photovoltaic t period out lower limit value, < ->The upper limit value of the output force of the photovoltaic t period is related to the predicted output force of the photovoltaic and the physical characteristics of the photovoltaic system, and the graph of the predicted output force of the photovoltaic is shown in fig. 8.
In some embodiments of the invention, nonlinear constraint boundary conditions exist for both natural gas network power flow constraints and power network constraints, and solving for nonlinear systems is complex and difficult. In order to realize the rapid and effective solution of the scheduling and planning problem of the comprehensive energy system, the nonlinear constraint condition in the light-hydrogen-storage comprehensive energy system suitable for the remote agriculture and animal husbandry area needs to be subjected to linear transformation treatment.
Specifically, the linearization conversion of natural gas network tide constraints:
s1: will S ij，t Conversion to 0-1 auxiliary variable mu ij，t Sum mu ji，t ，μ ij，t Is 1 mu ji，t When the flow is 0, the actual direction of the air network flow flows from the i node to the j node, and the time subscript t and mu is omitted because the flow analysis principle of each period is the same ij Sum mu ji The constraints of (2) are: mu (mu) ij +μ ji ＝1；
Air network tide direction variable S ij The constraints of (2) are: s is S ij ＝μ ij -μ ji ；
When the air network tide flows from i to j, mu is added ij ＝1，μ ji ＝0，S ij =1, carry over to equation (11), yield:
/>
in the middle ofThe maximum passable flow of the ij pipeline is set;
when the air network tide flows from j to i, mu is added ji ＝1，μ ij ＝0，S ij = -1 brings into equation (11) and squares both sides of the equation to get:
s2: will be in S1And P i And P j Is converted by piecewise linearization of the relation of>Equally dividing into 2n parts:
mu in the middle ij，m And mu ji，m Is an auxiliary variable of 0-1, and
wherein 0 to Q ij，max Equally dividing into n parts to obtain Q ij，m Will Q ij，m Squaring to obtainAnd Q is ij，m And->All are constants, and the piecewise linear transformation schematic is shown in figure 7;
s3: definition of the definitionObtaining the pipeline flow variable->Node barometric variable +.> The relation between:
in the middle ofAnd->Is the square of the air pressure of node i, j, and +.>As an intermediate variable, it is possible to omit the constraint of formulae (28) - (29) to add the pipe flow variable +.>The nonlinear relation between the pressure variable of the node ij and the pressure variable of the node ij is converted into a linear relation, and the formula (28) shows that +. >Only at Q ij，m N constants of (1.ltoreq.m.ltoreq.n) are each of which n is greater than n>The higher the value accuracy is, the more the optimization is performed>P i ，P j The closer to the optimal value is the value of (2), but the larger n is, the 0-1 auxiliary variable mu is introduced ij，m And mu ji，m The equal proportion is increased, and the excessive 0-1 variable can greatly reduce the solving speed and efficiency.
The linearization of the power network constraint is converted into a second order cone relaxation method, which comprises the following steps:
s1: subjecting formula (15) to conversion treatment to defineAnd performing second order cone relaxation conversion to obtain:
s2: equivalent conversion of equation (30) to a standard form of second order cone relaxation of the type 2 norm expression yields:
and then will beSubstituting the formula (13) - (14) to obtain a converted optimal power flow constraint equation:
in some embodiments of the invention, the light-hydrogen-storage integrated energy system suitable for remote agriculture and animal husbandry is subjected to simulation analysis, the running cost and the environmental cost of the integrated energy system are optimized in a single target mode, the time step delta T is 15min, the scheduling time T is 24h a day, the electric, hydrogen and gas loads of the integrated energy system are distributed as shown in fig. 3-5 a 24h day, the power factor is 0.85 for the electric load in the integrated energy system, and meanwhile, when the integrated energy system consumes power, namely ESSs transmit power to the integrated energy system, the power factor at a connecting line is required to be more than 0.9, and if the conditions are not met, a reactive compensation device is put into; according to national standard requirements, the voltage deviation of each node in the comprehensive energy system meets-5%; because the calculation example of the system is a low-voltage radial system, the line impedance is R=0.64 Ω/km, X=0.64 Ω/km, and the photovoltaic output prediction graph is carried out on the remote agriculture and animal husbandry area, as shown in fig. 8, the photovoltaic output is obviously characterized by no output at night and larger output in daytime.
In some embodiments of the present invention, when the photovoltaic output of the integrated energy system increases, the consumption of ESSs power by the integrated energy power load may be reduced first, the power cost is reduced, and thus the operation cost of the integrated energy system is reduced, and the integrated energy power load is directly supplied with power by the photovoltaic without generating CO 2 The environmental benefit is good; when the photovoltaic surplus is large, the HGESS system can store energy and convert the surplus electric energy into natural gas, and the process (methanation) can reduce CO 2 The method has good environmental benefit, reduces the requirement of comprehensive energy gas load on gas supply of the gas storage system, and reduces the running cost of the system.
When the total amount of the photovoltaic grid-connected system reaches the upper limit of the consumption, that is, the ESSs and the HGESS of the comprehensive energy source can not consume the surplus photovoltaic, the amount of the waste light is increased along with the larger total amount of the photovoltaic grid-connected system, as shown in the table 2:
TABLE 2 comprehensive energy System operating costs and environmental costs at different photovoltaic permeabilities
/>
As can be seen from table 2, as the photovoltaic output increases, the photovoltaic utilization also gradually decreases, and the light rejection occurs mainly in the midday period; the electric load in the comprehensive energy is small in the period, and the photovoltaic output is the largest in the day in the period, so that a large amount of surplus photovoltaic occurs in the system, ESSs have small residual energy absorption space for the electric energy of the comprehensive energy, and the surplus photovoltaic is basically stored by an energy storage subsystem (HGESS) of the comprehensive energy system; although the light rejection occurs when the photovoltaic output is increased, the light rejection ratio is smaller, and the HGESS is also proved to be beneficial to realizing the economic and environment-friendly operation of the comprehensive energy system, and the photovoltaic utilization rate can be improved and the light rejection is reduced.
In some embodiments of the invention, the comprehensive target optimization is performed on the operation cost and the environmental cost of the comprehensive energy system, and in the actual operation process of the comprehensive energy system, the economic operation of the comprehensive energy system is realized, and the environmental benefit of the comprehensive energy system is considered; because the environmental cost is difficult to be measured by price like the running cost, the invention adopts a per unit value method, and the weight coefficient is given to the running cost of the system and the environmental cost according to the importance degree, and the weight coefficient omega of the running cost of the system 1 And an environmental cost weighting coefficient omega 2 And assigning values, and respectively carrying out optimization solution on the comprehensive operation targets of the group of different coefficients to obtain 5 groups of optimization results, wherein the table 3 is shown.
TABLE 3 comprehensive energy System comprehensive objective optimization results under different weight coefficients
As can be seen from Table 3, with ω 1 And ω 2 The operating cost at the optimum target of integrated operation is gradually increased and the environmental cost is gradually reduced. At omega 1 When the cost is 1, the system achieves the minimum running cost, but the environmental cost is the maximum; while when omega 2 When the energy consumption is 1, the system achieves the minimum environmental cost, but the maximum running cost, and the weight coefficient is selected according to the characteristics and the requirements of the comprehensive energy system, so that the economical efficiency and the environmental protection comprehensive goal of the operation of the comprehensive energy system are realized.
In conclusion, the light-hydrogen-storage comprehensive energy system suitable for the remote agriculture and animal husbandry can better realize the coordinated balance of operation economy and environmental protection, and provides reliable, efficient, clean and sustainable energy supply for the remote agriculture and animal husbandry, isolated islands, frontier posts and other off-grid areas.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives, and variations may be made in the above embodiments by those skilled in the art without departing from the spirit and principles of the invention.
Claims (9)
1. The light-hydrogen-storage integrated energy system suitable for the remote agriculture and animal husbandry is characterized by comprising a control system, a photovoltaic subsystem, an electrolytic cell, a fuel cell, a hydrogen storage subsystem, a load and other matched equipment;
the control system is used for controlling the electrolytic cell, the fuel cell, the hydrogen storage subsystem, other matched equipment and the hydrogen transmission pipeline valve and collecting real-time state information of the photovoltaic subsystem, the electrolytic cell, the fuel cell, the hydrogen storage subsystem, the load and other matched equipment;
the photovoltaic subsystem comprises a photovoltaic power generation unit, an inverter unit, a photovoltaic power station weather station, a measurement and control unit and electrical equipment, wherein the photovoltaic power generation unit comprises a string and a combiner box, the inverter unit comprises a direct current power distribution cabinet and an inverter, and the measurement and control unit comprises an electric energy metering device, an electric energy quality analysis device and a public connection point measurement and control device;
the electrolytic cell is any one of an alkaline electrolytic cell AEC, a solid oxide electrolytic cell SOEC and a proton exchange membrane electrolytic cell PEMEC, and is used for introducing direct current to a cathode and an anode to electrolyze water into hydrogen and oxygen;
the fuel cell is one of an alkaline fuel cell AFC, a phosphoric acid fuel cell PAFC, a solid oxide fuel cell SOFC, a molten carbonate fuel cell MCFC and a proton exchange membrane fuel cell PEMFC, and is used for respectively introducing oxide and fuel to a cathode and an anode, and generating a combination reaction in the cell to generate electric energy;
The hydrogen storage subsystem comprises compressed gaseous hydrogen storage, low-temperature liquid hydrogen storage and solid hydrogen storage, and is used for improving the volume energy density during hydrogen storage and reducing the volume occupied by hydrogen gas;
the load includes an electrical load, a hydrogen load, and a gas load;
the other matched equipment is power electronic equipment and is used for converting the electric energy form and providing electric energy for each equipment.
2. The integrated light-hydrogen-storage energy system for use in remote farming and pasture areas of claim 1, further comprising a water circulation subsystem for collecting water produced by the fuel cell and supplying it to the electrolytic cell.
3. The integrated optical xi hydrogen storage energy system suitable for remote agriculture and animal husbandry according to claim 1, wherein said converted electrical energy is in the form of P2G technology, said P2G technology comprising electric conversion of hydrogen energy and electric conversion of natural gas, wherein the electric conversion of natural gas is the conversion of hydrogen energy generated by electric conversion of hydrogen energy into natural gas.
4. An objective function of an optical-hydrogen-storage integrated energy system suitable for use in remote farming and pasture areas as claimed in any one of claims 1-3, comprising integrated energy system operating costs, environmental costs and integrated energy system integrated operating costs, said integrated energy system operating costs comprising ESSs operating costs, natural gas network operating costs and integrated energy system operating energy loss penalty costs;
The operation cost of the comprehensive energy system is as follows:
f 1 ＝f 11 +f 12 +f 13 ，
wherein f 11 For ESSs running cost, f 12 For the natural gas network operation cost, f 13 Penalty cost for operating energy loss for the integrated energy system;
the ESSs are operated at the following cost:
wherein R is t Supplying cost coefficient r for ESSs to comprehensive energy system t A cost factor for the integrated energy system to power the ess,active power delivered to the integrated energy system for the period t ESSs +.>The active power which is transmitted to ESSs by the comprehensive energy system in the t period is obtained, and delta t is the step length;
the natural gas network operation cost is as follows:
wherein C is n1 Cost coefficient for directly consuming and storing natural gas for comprehensive energy system, C n2 The cost coefficients of natural gas are stored for the integrated energy system,power obtained from natural gas storage for t-period integrated energy system, +.>The power transmitted to the natural gas storage equipment by the comprehensive energy system in the t period is 10.8 (KW.h)/m, wherein H is the high heat value of the natural gas 3 ；
The operation energy loss punishment cost of the comprehensive energy system is as follows:
wherein K is Loss Is weight coefficient, K is more than or equal to 0 Loss ≤1，Penalty cost for cell operation energy loss, < >>Penalty cost for fuel cell operation energy loss, < >>Penalty cost for operating an electric power plant, < > >Penalty costs for gas turbine operation energy loss;
the said
The said
The said
The said
Wherein alpha is E2H Alpha is the efficiency of electrolytic hydrogen production H2E For fuel cell power generation efficiency, alpha H2G Efficiency for synthesizing natural gas from hydrogen, alpha MT For generating efficiency of gas turbine, N EL N is the number of electrolytic cell devices FC N is the number of fuel cell devices H2G For the total number of the electric conversion devices, N MT Is the number of the gas turbines to be used,for the power consumed by the ith electrolytic cell during period t,/->Power generation for fuel cell, < >>Generating natural gas power for P2G devices,/->Generating power for the gas turbine;
the environmental cost is:
wherein,average CO for unit power supply of comprehensive energy system 2 Emission coefficient, < >>Generating CO for MT 2 The coefficient of emission (f) is set,is CH 4 CO of (c) 2 Capturing coefficients;
the comprehensive operation cost of the comprehensive energy system is as follows:
wherein omega 1 +ω 2 ＝ 1 ，0≤ω 1 ，ω 2 ≤1，f 1 max For the maximum operating cost of the integrated energy system,to the maximum environmental cost of the comprehensive energy system omega 1 For the weight coefficient omega of the operation cost of the comprehensive energy system 2 The environmental cost weight coefficient of the comprehensive energy system is obtained.
5. A constraint for an optical-hydrogen-storage integrated energy system adapted for use in a remote farming area as claimed in any one of claims 1-4, comprising a hydrogen storage constraint and a charge-discharge constraint;
The hydrogen storage constraint is as follows:
E T ＝E 0 (3)；
the formula (1) is that the charging and discharging power of the hydrogen energy storage system is balanced, the formula (2) is the limitation of the maximum capacity and the minimum capacity, and the formula (3) is that the starting state of the comprehensive energy system in the next scheduling period is consistent with the starting state of the previous scheduling period;
in the middle ofFor the hydrogen energy stored by the hydrogen storage system in the period t, P t 1H Hydrogen energy consumed by hydrogen load of t-period comprehensive energy system, P t 2H Hydrogen energy consumed for electric conversion +.>As a maximum capacity limit value, the maximum capacity limit value,E H is the minimum capacity limit;
the charge-discharge constraint is as follows:
in the middle ofP EL For the minimum power of the electrolytic cell,for the maximum power of the electrolytic cell,P FC for minimum power of fuel cell, < > for>For the maximum power of the fuel cell,P H2G for the minimum power of the electric switching device, +.>Maximum power of electric conversion device, B EL For the electrolytic cell device set, B FC For fuel cell device assembly, B H2G For the electric switching device set, < >>And->Is a 0-1 variable.
6. The constraint condition of an optical-hydrogen-storage integrated energy system suitable for use in a remote farming and pastoral area of claim 5, further comprising a natural gas network power flow constraint comprising a barometric pressure constraint, a node flow balancing constraint, an active in-pipeline natural gas network power flow constraint, and a passive in-pipeline natural gas network power flow constraint;
The air pressure constraint is as follows:
in the middle ofB is the air pressure of the ith node in the air network in the period t gas Is the air pressure node set, P i max At maximum air pressure, P i m Is the minimum air pressure;
the node traffic balance constraint is:
in the middle ofFor the inflow of natural gas from the gas source to node i during period t, +.>CH injected into i node for electric conversion device 4 ，/>CH consumed for MT 4 ，/>For natural gas load, +.>Natural gas flowing to other nodes of the gas network for the i node;
the natural gas network tide constraint in the active pipeline is as follows:
βP in ＝P out (8)
Q min ≤Q ij ≤Q max (10)；
p in the formula in And P out Is the air pressure at the inlet and outlet of the natural gas compressor, beta is the compression ratio, beta min Beta, the minimum compression ratio max For maximum compression ratio, Q ij Natural gas flow, Q, delivered for active natural gas pipeline min To minimize natural gas flow, Q max Is the maximum natural gas flow;
the natural gas network tide constraint in the passive pipeline is as follows:
in the middle ofK being the natural gas flow of the pipeline ij in the period t ij Is the tide parameter of the natural gas pipeline, S ij，t Is the natural gas flow direction in the natural gas pipeline ij, and the direction from i to j is positive,/is the direction from i to j>Is the air pressure of the air network node i->Is the air pressure of the air network node j, wherein,
7. the light-hydrogen-storage integrated energy system constraint applicable to remote farming and pasture areas of claim 5, further comprising an electrical network constraint comprising integrated energy system tide constraint and power exchange constraint and other constraints comprising gas turbine climbing, landslide constraint and photovoltaic output constraint;
The flow constraint of the comprehensive energy system is as follows:
wherein r is ij And x ij G is the branch impedance j And b j Is the admittance of the node to ground, and r ij 、x ij 、g j And b j All are constant, V i And V j For node voltage, I ij And I i For the branch current, P jk 、P ij 、Q jk And Q ij For branch tidal current, p j 、q j Injecting power for the node;
the power exchange constraint is:
k in the formula in Is the proportionality coefficient of the segmentation weight coefficient and ESSs charge state, P in，max 、Q in，max Constraint upper limit for power exchange, -Q out，max A lower limit value for power exchange constraint;
the gas turbine is restrained when climbing a slope:
P MT (t)-P MT (t-1)≤P up，MT (20)；
p in the formula up，MT To limit the climbing power rising speed, P MT (t) is the climbing power in the period t, P MT (t-1) is the climbing power in the period t-1;
the gas turbine is constrained when sliding down:
P MT (t-1)-P MT (t)≤P down，MT (21)；
p in the formula down，MT P is the restriction of the power rising rate of landslide MT (t) is landslide power at time t, P MT (t-1) is the landslide power during period t-1;
the photovoltaic output constraint is as follows:
in the middle ofFor the photovoltaic t period out lower limit value, < ->And outputting a force upper limit value for the photovoltaic t period.
8. The constraint condition of an integrated light-hydrogen-storage energy system suitable for use in remote farming and pastoral areas according to claim 6, wherein the natural gas network tide constraint further comprises a linearization transformation, in particular:
S1: will S ij，t Conversion to 0-1 auxiliary variable mu ij，t Sum mu ji，t ，μ ij，t Is 1 mu ji，t When the flow is 0, the actual direction of the air network flow flows from the i node to the j node, and the time subscript t and mu is omitted because the flow analysis principle of each period is the same ij Sum mu ji The constraints of (2) are: mu (mu) ij +μ ji ＝1；
Air network tide direction variable S ij The constraints of (2) are: s is S ij ＝μ ij -μ ji ；
When the air network tide flows from i to j, mu is added ij ＝1，μ ji ＝0，S ij =1, carry over to equation (11), yield:
in the middle ofThe maximum passable flow of the ij pipeline is set;
when the air network tide flows from j to i, mu is added ji ＝1，μ ij ＝0，S ij = -1 brings into formula (11), yielding:
s2: will be in S1And P i And P j Is converted by piecewise linearization of the relation of>Equally dividing into 2n parts:
mu in the middle ij，m And mu ji，m Is an auxiliary variable of 0-1, and
wherein 0 to Q ij，max Equally dividing into n parts to obtain Q ij，m Will Q ij，m Squaring to obtainAnd Q is ij，m And->Are all constants;
s3: will beAnd->Obtaining:
in the middle ofAnd->Is the square of the air pressure at node i, j.
9. The constraint condition of an optical xi, hydrogen storage integrated energy system suitable for remote agriculture and animal husbandry area according to claim 7, wherein the power network constraint further comprises linearization conversion, wherein the linearization conversion is a second order cone relaxation method, specifically:
s1: will beAnd performing second order cone looseningRelaxation conversion to obtain:
s2: equivalent conversion of equation (30) to a standard form of second order cone relaxation of the type 2 norm expression yields:
And then will beSubstituting the formula (13) - (14) to obtain a converted optimal power flow constraint equation:
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