An optimal configuration method and device of a hydrogen-electricity coupling micro-grid system

Abstract

The application provides an optimal configuration method and device of a hydrogen-electricity coupling micro-grid system, relates to the technical field of power systems, and obtains an adjustment limiting parameter of a water electrolysis hydrogen production unit; obtains hydrogen production rated power of the water electrolysis hydrogen production unit, a battery rated power range and a battery rated capacity range of an energy storage battery unit according to the adjustment limiting parameter; collects historical power generation data corresponding to a power generation unit and historical power consumption load data corresponding to a power consumption load unit; performs cost optimization prediction according to the historical power generation data, the historical power consumption load data, the hydrogen production rated power, the battery rated power range and the battery rated capacity range, and a preset coordination working mode corresponding to the water electrolysis hydrogen production unit and the energy storage battery unit; obtains battery rated power and battery rated capacity corresponding to the lowest cost obtained after cost optimization; and optimally configures the hydrogen-electricity coupling micro-grid system according to the hydrogen production rated power, the battery rated power and the battery rated capacity.

Description

Technical Field

[0001] This application relates to the field of power system technology, and in particular to an optimized configuration method and apparatus for a hydrogen-electric coupled microgrid system. Background Technology

[0002] With the development of new power systems, the high proportion of fluctuating renewable energy sources has posed a significant challenge to grid stability. To maintain power system stability, most regions now require renewable energy power plants to be equipped with a certain proportion of battery energy storage. However, battery energy storage involves large initial investments and has a short lifespan, placing considerable economic pressure on renewable energy projects.

[0003] Electrolysis-based hydrogen production can absorb and utilize new energy sources, converting them into hydrogen for storage or transportation. Its fixed investment cost is only 1 / 10 of that of energy storage with the same capacity, making it a promising microgrid regulation technology. However, current operational experience with electrolysis-based hydrogen production equipment is mostly limited to steady-state conditions, and the dynamic characteristics of large-scale equipment are not yet fully understood. This makes it difficult to estimate the potential role of electrolysis-based hydrogen production equipment in microgrids, thus limiting the promotion of hydrogen energy microgrids. Summary of the Invention

[0004] This application aims to at least partially address one of the technical problems in the related art.

[0005] Therefore, one objective of this application is to propose an optimized configuration method for a hydrogen-electric coupling microgrid system. The hydrogen-electric coupling microgrid system includes a power generation unit, a water electrolysis hydrogen production unit, an energy storage battery unit, and an electrical load unit. The method includes: obtaining regulation and limiting parameters for the water electrolysis hydrogen production unit, including an upper power limit, a lower power limit, an upper limit for the power increase rate, and an upper limit for the power decrease rate; obtaining the rated hydrogen production power of the water electrolysis hydrogen production unit, the rated battery power range of the energy storage battery unit, and the rated battery capacity range based on the regulation and limiting parameters; collecting historical power generation data corresponding to the power generation unit and historical electrical load data corresponding to the electrical load unit; performing cost optimization prediction based on the historical power generation data, historical electrical load data, rated hydrogen production power, rated battery power range, and rated battery capacity range, according to a preset coordinated working mode corresponding to the water electrolysis hydrogen production unit and the energy storage battery unit; obtaining the rated battery power and rated battery capacity corresponding to the lowest cost obtained after cost optimization; and optimizing the configuration of the hydrogen-electric coupling microgrid system based on the rated hydrogen production power, rated battery power, and rated battery capacity.

[0006] The second objective of this application is to propose an optimized configuration device for a hydrogen-electric coupled microgrid system.

[0007] The third objective of this application is to propose an electronic device.

[0008] The fourth objective of this application is to provide a non-transitory computer-readable storage medium.

[0009] The fifth objective of this application is to provide a computer program product.

[0010] To achieve the above objectives, the first aspect of this application proposes an optimized configuration method for a hydrogen-electric coupling microgrid system. The hydrogen-electric coupling microgrid system includes a power generation unit, a water electrolysis hydrogen production unit, an energy storage battery unit, and an electrical load unit. The method includes: obtaining adjustment and limiting parameters for the water electrolysis hydrogen production unit, including an upper power limit, a lower power limit, an upper power increase rate limit, and an upper power decrease rate limit for the water electrolysis hydrogen production unit; obtaining, based on the adjustment and limiting parameters, the rated hydrogen production power of the water electrolysis hydrogen production unit, the rated battery power range of the energy storage battery unit, and the rated battery capacity range; collecting historical power generation data corresponding to the power generation unit and historical electrical load data corresponding to the electrical load unit; performing cost optimization prediction based on the historical power generation data, historical electrical load data, the rated hydrogen production power, the rated battery power range, and the rated battery capacity range, according to a preset coordinated working mode corresponding to the water electrolysis hydrogen production unit and the energy storage battery unit; obtaining the rated battery power and rated battery capacity corresponding to the lowest cost obtained after cost optimization; and optimizing the configuration of the hydrogen-electric coupling microgrid system based on the rated hydrogen production power, the rated battery power, and the rated battery capacity.

[0011] According to one embodiment of this application, when performing cost optimization prediction based on the preset coordinated operation mode corresponding to the water electrolysis hydrogen production unit and the energy storage battery unit, the corresponding cost optimization function is:

[0012] C = C H +C E +C G +C dPH -R H

[0013] Where: C is the cost calculated in the current optimization process, C H For the total lifecycle cost of a water electrolysis hydrogen production unit, C E For the cost of energy storage battery cells over their entire life cycle, C G C represents the total cost of electricity consumption over the entire lifecycle of the power grid. dPH The cost of all power regulation incurred throughout the entire lifecycle of the water electrolysis hydrogen production unit is the sum of all power regulation costs over the entire lifecycle. The cost of each power regulation is related to the magnitude and speed of the power regulation. H This refers to the revenue from the sale of hydrogen throughout its entire lifecycle.

[0014] According to one embodiment of this application, R H The corresponding calculation formula is:

[0015] C H =a×e H ×P H +b×∫p H dt

[0016] Where 'a' is the depreciation rate of the water electrolysis hydrogen production unit over its entire life cycle, and 'e' is the depreciation rate of the unit. H P is the fixed investment cost per unit capacity of a water electrolysis hydrogen production unit. H ∫p is the rated hydrogen production power of the water electrolysis hydrogen production unit, and b is the cost per unit of hydrogen production power consumption; H dt is the total energy consumption for hydrogen production via electrolysis over its entire lifecycle, expressed in kWh.

[0017] According to one embodiment of this application, C E The corresponding calculation formula is:

[0018] C E =c×e×Q E +d×∫|p E |dt

[0019] Where c is the depreciation rate of the battery over its entire life cycle, e is the fixed investment cost per unit capacity of the energy storage battery cell, and Q is... E Let d be the rated capacity of the energy storage battery cell, and ∫|p be the cost per unit charge / discharge capacity of the battery. E |dt is the total charge and discharge capacity of the energy storage battery unit throughout its entire life cycle, expressed in kWh.

[0020] According to one embodiment of this application, C G The corresponding calculation formula is:

[0021]

[0022] Where s1 is the cost of transmitting electricity to the grid, in yuan / kWh. If grid-connected electricity sales are permitted, then s1 < 0, and the absolute value of s1 is the grid-connected electricity sales price; if grid-connected electricity sales are not permitted, then s1 > 0, and the absolute value of s1 is the penalty value for excess electricity generated per unit of grid connection. s2 is the cost of transferring electricity from the grid, in yuan / kWh. If grid-connected electricity sales are permitted, then s2 > 0, and the absolute value of s2 is the price of purchasing electricity from the grid; if grid-connected electricity sales are not permitted, then s2 < 0, and the absolute value of s2 is the penalty value for the amount of electricity transferred to the grid. p G This represents the amount of electricity transmitted from the microgrid system to the main grid. Positive values ​​indicate power transmission to the grid, while negative values ​​indicate power being cut off from the grid.

[0023] According to one embodiment of this application, C dPH and R H The corresponding calculation formulas are as follows:

[0024] CdPH =∑(c1×△w+c2×△Lv+c3×△Q+c4×△Q) W +c5×△v)

[0025] Among them, C dPH This represents the cost of all power adjustments incurred throughout the entire lifecycle of the water electrolysis hydrogen production unit. For any single adjustment process, c1 is a coefficient considering the safety risks of gas post-treatment and gas contamination, with Δw representing the change in gas purity; c2 is a coefficient considering the safety risks of increased liquid level difference, with ΔLv representing the change in liquid level difference; c3 is the cost coefficient for adjusting the alkali flow rate, with ΔQ representing the change in alkali flow rate; and c4 is the cost coefficient for adjusting the cooling medium flow rate, with ΔQ representing the change in cooling medium flow rate. W For the change in cooling medium flow rate, c5 is a coefficient considering the valve operation cost, and Δv is the change in gas valve opening.

[0026] R H =k×e2×∫p H dt

[0027] Where k is the amount of hydrogen produced per unit of hydrogen production electricity; e2 is the selling price of hydrogen per unit.

[0028] According to one embodiment of this application, the preset coordinated operation mode corresponding to the water electrolysis hydrogen production unit and the energy storage battery unit includes: combining historical power generation data and historical power load data, and comparing the magnitude of power generation and power load in real time at set time points within the life cycle; if the power generation is greater than the power load, obtaining a first difference between the power generation and the power load; if the first difference is less than the power limit of the water electrolysis hydrogen production unit, controlling the water electrolysis hydrogen production unit to produce hydrogen according to the first difference; if the first difference is equal to the power limit of the water electrolysis hydrogen production unit, controlling the water electrolysis hydrogen production unit to produce hydrogen according to the power limit.

[0029] According to one embodiment of this application, the optimized configuration method of a hydrogen-electric coupled microgrid system further includes: if a first difference is greater than the power limit of the water electrolysis hydrogen production unit, then controlling the water electrolysis hydrogen production unit to produce hydrogen according to the power limit, and obtaining the difference between the first difference and the power limit as a second difference; obtaining the maximum charging power of the energy storage battery unit; if the second difference is less than the maximum charging power of the battery, then controlling the energy storage battery unit to charge according to the second difference; if the second difference is greater than or equal to the maximum charging power of the battery, then controlling the energy storage battery unit to charge according to the maximum charging power of the battery.

[0030] According to one embodiment of this application, the optimized configuration method of a hydrogen-electric coupled microgrid system further includes: if the power generation is less than the power load, controlling the power of the water electrolysis hydrogen production unit to be 0, and obtaining a third difference between the power generation and the power load; if the third difference is less than the rated power of the energy storage battery unit, controlling the energy storage battery unit to supply power to the power load unit according to the third difference and controlling the power generation unit to supply power according to the power generation; if the third difference is equal to the rated power of the energy storage battery unit, controlling the energy storage battery unit to supply power to the power load unit according to the rated power and controlling the power generation unit to supply power according to the power generation; if the third difference is greater than the rated power of the energy storage battery unit, obtaining a fourth difference between the third difference and the rated power; and cutting power from the grid based on the fourth difference, and controlling the energy storage battery unit to supply power to the power load unit according to the rated power, controlling the power generation unit to supply power according to the power generation, and combining the power cutting from the grid.

[0031] According to one embodiment of this application, in the process of cost optimization prediction based on the preset coordinated working mode corresponding to the water electrolysis hydrogen production unit and the energy storage battery unit, the following requirements need to be met:

[0032] p s +p E =p H +p L +p G ;

[0033] |p E |≤P E

[0034] p H ∈{P min ,P max}

[0035] v H ∈{v - P,max ,v + P,max}

[0036] Q 储能 ≤Q E

[0037] Where, p s p represents the output power of the power generation unit. E p represents the output power of the energy storage battery unit. H p represents the output power of the water electrolysis hydrogen production unit. L p is the power required by the electrical load unit. G P represents the incoming power from the power grid. E P is the rated power of the energy storage battery cell. minP is the lower limit of the power output of the water electrolysis hydrogen production unit. max v is the upper limit of the power of the water electrolysis hydrogen production unit. H The power regulation speed of the water electrolysis hydrogen production unit, v - P,max v is the upper limit of the power decrease rate of the water electrolysis hydrogen production unit. + P,max Q represents the upper limit of the power increase rate of the water electrolysis hydrogen production unit; 储能 Q represents the current energy storage capacity of the energy storage battery cell. E This refers to the rated capacity of the energy storage battery unit.

[0038] To achieve the above objectives, a second aspect of this application provides an optimized configuration device for a hydrogen-electric coupled microgrid system, comprising:

[0039] The first acquisition module is used to acquire the adjustment and limiting parameters of the water electrolysis hydrogen production unit. The adjustment and limiting parameters include the upper limit of power, the lower limit of power, the upper limit of power increase rate, and the upper limit of power decrease rate of the water electrolysis hydrogen production unit.

[0040] The second acquisition module is used to acquire the rated hydrogen production power of the water electrolysis hydrogen production unit, the rated power range of the energy storage battery unit, and the rated capacity range of the battery, based on the adjustment and limiting parameters.

[0041] The collection module is used to collect historical power generation data corresponding to the power generation unit and historical power load data corresponding to the power load unit.

[0042] The cost optimization module is used to predict the cost optimization based on historical power generation data, historical power load data, hydrogen production rated power, battery rated power range and battery rated capacity range, according to the preset coordinated working mode of the water electrolysis hydrogen production unit and the energy storage battery unit.

[0043] The third acquisition module is used to acquire the battery rated power and battery rated capacity corresponding to the lowest cost obtained after cost optimization.

[0044] The configuration module is used to optimize the configuration of the hydrogen-electric coupling microgrid system based on the rated hydrogen production power, rated battery power, and rated battery capacity.

[0045] To achieve the above objectives, a third aspect of this application provides an electronic device, comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to implement the optimized configuration method for a hydrogen-electric coupled microgrid system as described in the first aspect of this application.

[0046] To achieve the above objectives, a fourth aspect of this application provides a non-transitory computer-readable storage medium storing computer instructions, wherein the computer instructions are used to implement the optimized configuration method for a hydrogen-electric coupled microgrid system as described in the first aspect of this application.

[0047] To achieve the above objectives, a fifth aspect of this application provides a computer program product, including a computer program that, when executed by a processor, implements the optimized configuration method for a hydrogen-electric coupled microgrid system as described in the first aspect of this application.

[0048] This application achieves at least the following beneficial effects:

[0049] 1. Under the conditions of rising and falling power in the microgrid, the energy storage battery unit can bear the balance demand after the water electrolysis hydrogen production unit adjusts its power at the maximum power speed, thereby reducing the number of times the water electrolysis hydrogen production unit is shut down in an emergency.

[0050] 2. The microgrid is controlled in a coordinated manner by the water electrolysis hydrogen production unit and the energy storage battery unit, giving full play to the capacity regulation function of the water electrolysis hydrogen production unit and the rapid power regulation function of the energy storage battery unit.

[0051] 3. Based on the operating characteristics of the microgrid's power generation and consumption loads, determine the flexible adjustment range requirements of the electrolysis hydrogen production unit and the capacity requirements of the energy storage module to reduce the overall cycle cost.

[0052] 4. The operation mode of the microgrid was determined based on its structural characteristics, meeting the requirements for safe, stable, and efficient operation of the microgrid. Attached Figure Description

[0053] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0054] Figure 1 This is a schematic diagram of a hydrogen-electric coupling microgrid system shown in one embodiment of this application.

[0055] Figure 2 This is a schematic diagram illustrating an exemplary implementation of an optimized configuration method for a hydrogen-electric coupled microgrid system, as shown in one embodiment of this application.

[0056] Figure 3 This is a schematic diagram of an optimized configuration device for a hydrogen-electric coupling microgrid system, as shown in one embodiment of this application.

[0057] Figure 4 This is a schematic diagram of an electronic device according to one embodiment of this application. Detailed Implementation

[0058] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0059] It should be noted that the information (including but not limited to user device information, user personal information, etc.), data (including but not limited to data used for analysis, data stored, data displayed, etc.) and signals involved in this application are all authorized by the user or fully authorized by all parties, and the collection, use and processing of related data must comply with the relevant laws, regulations and standards of the relevant countries and regions.

[0060] Figure 1 This application illustrates a schematic diagram of a hydrogen-electric-coupled microgrid system, as shown below. Figure 1 As shown in this application, the hydrogen-electric coupled microgrid system includes a power generation unit, a water electrolysis hydrogen production unit, an energy storage battery unit, and an electrical load unit.

[0061] The power generation units are power generation systems with fluctuating output, such as solar photovoltaic power generation, wind power generation, and hydropower generation.

[0062] The water electrolysis hydrogen production unit serves as a power fluctuation mitigation unit for the microgrid. Through its fluctuating operation, the unit helps stabilize the system's power generation and consumption, and it features adjustable power output. The water electrolysis hydrogen production unit handles the remaining power generated by the power generation unit after supplying the load, thus maintaining system stability.

[0063] Energy storage battery units serve as a voltage stabilization source for microgrids, maintaining voltage and frequency stability during microgrid operation through their millisecond-level rapid response.

[0064] The power load unit is a fluctuating power load, powered by the generation unit. When the generation unit cannot handle the power load, the energy storage battery unit and the generation unit jointly power the power load. When the energy storage battery unit and the generation unit still cannot handle the power load, the external power grid, the energy storage battery unit, and the generation unit jointly power the power load. The power consumption priority of the power load is: generation system > energy storage battery > external power grid.

[0065] Figure 2 This is a schematic diagram of an exemplary embodiment of an optimized configuration method for a hydrogen-electric coupled microgrid system shown in this application, as illustrated below. Figure 2 As shown, the optimized configuration method for this hydrogen-electric coupled microgrid system includes the following steps:

[0066] S201, Obtain the adjustment and limiting parameters of the water electrolysis hydrogen production unit. The adjustment and limiting parameters include the upper limit of power, the lower limit of power, the upper limit of power increase rate, and the upper limit of power decrease rate of the water electrolysis hydrogen production unit.

[0067] S202, based on the adjustment and limiting parameters, obtain the rated hydrogen production power of the water electrolysis hydrogen production unit, the rated power range of the energy storage battery unit, and the rated capacity range of the battery.

[0068] S203, collect historical power generation data corresponding to the power generation unit and historical power load data corresponding to the power load unit.

[0069] S204. Based on historical power generation data, historical power load data, rated hydrogen production power, rated battery power range, and rated battery capacity range, cost optimization prediction is performed according to the preset coordinated working mode corresponding to the water electrolysis hydrogen production unit and the energy storage battery unit.

[0070] S205, obtain the lowest cost corresponding to the battery rated power and battery rated capacity after cost optimization.

[0071] S206 optimizes the configuration of the hydrogen-electric coupling microgrid system based on the rated power of hydrogen production, the rated power of the battery, and the rated capacity of the battery.

[0072] In S201, the power limit refers to the maximum power that the water electrolysis hydrogen production unit can stably output within its normal operating temperature range. This parameter represents the highest power level that the water electrolysis hydrogen production unit can achieve under normal operating conditions. The power limit is usually expressed in watts (W), and exceeding this power limit may lead to system overload, damage, or other adverse consequences. In this application, the power limit is denoted as P. max .

[0073] In S201, the power lower limit refers to the minimum power value that the water electrolysis hydrogen production unit can stably output within its normal operating temperature range. This parameter represents the lowest power level that the water electrolysis hydrogen production unit can achieve under normal operating conditions. The power lower limit is usually expressed in watts (W). Falling below this power lower limit may cause the system to malfunction, experience performance degradation, or other problems. In this application, the power lower limit is denoted as P. min .

[0074] In S201, the power rise rate refers to the rate at which the power value changes over time when the system transitions from a low-power state to a high-power state. It represents the amount of power increase per unit time, typically expressed in watts per second (W / s) or percentages per second. In this application, an upper limit for the power rise rate is obtained and denoted as v. + P,max .

[0075] In S201, the power decrease rate refers to the rate at which the power value changes over time when the system transitions from a high-power state to a low-power state. It represents the amount of power reduction per unit time, typically expressed in watts per second (W / s) or percentages per second. In this application, an upper limit for the power decrease rate is obtained and denoted as v. - P,max .

[0076] The following section details the methods for determining the four parameters: upper power limit, lower power limit, upper limit of power increase rate, and upper limit of power decrease rate.

[0077] 1. Lower power limit P min The determination method includes: obtaining the minimum allowable operating pressure of the water electrolysis hydrogen production system at the current moment; obtaining the minimum allowable alkaline flow rate of the water electrolysis hydrogen production system at the current moment; and determining the lower limit of power based on the minimum operating pressure and the minimum alkaline flow rate.

[0078] Specifically, the minimum permissible operating pressure p of the water electrolysis hydrogen production system at the current moment. min It is determined by the following formula:

[0079] p min =max{p l ,p(v m ,i),p(L)}

[0080] Where, p l The minimum permissible operating pressure for the system design is provided by the manufacturer; p(v m i) is the sum of the pressure drop generated by the gas flowing through the valve and the gas downstream pressure when operating at the lower power limit and the gas valve opening is at its maximum. (In this application, both the oxygen side and the hydrogen side of the system need to be considered, that is, at each moment p(v) m , i) has two values. ); p(L) is the pressure determined by the liquid level in the electrolytic hydrogen production gas-liquid separator.

[0081] Where p(v) m i) Determined by valve characteristics: p(v m i)=dp(v)+p exit .

[0082] v is the velocity of the gas passing through the valve when operating at the lower power limit, i is the operating current at the lower power limit, and dp(v) is the valve pressure drop at that velocity. (ρ is the gas density through the valve, and ζ is the valve characteristic coefficient, provided by the supplier); p exit This represents the gas outlet pressure.

[0083] Where p(L) = wgL + p0.

[0084] w is the density of the alkaline solution in the electrolytic cell system (determined by the density of the gas-liquid mixture), L is the difference between the liquid level in the gas-liquid separator and the reference height (such as the liquid level in the alkaline solution storage tank), p0 is the reference pressure (such as the surface pressure of the alkaline solution storage tank), and g is the acceleration due to gravity.

[0085] Because the formula requires the operating current i, p at the power lower limit. min The method for determining this requires iterative trial and error. Specifically: based on p... min =max{p l ,p(L)} determines p min Initial value; using this initial value, determine the lower power limit and the current i under this lower power limit through subsequent steps; verify p(v m i) and p min The magnitude of the initial value, if two p(v) m i) are all less than or equal to p min The lower power limit uses an initial value; if there exists any p(v m ,i)>p min The p(v) obtained by calculation m i) as p min And repeat the trial calculation process.

[0086] Specifically, the minimum allowable alkaline solution flow rate Q of the water electrolysis hydrogen production system at the current moment. min It is determined by the following formula:

[0087] Q min =max{q0,Q(n)}

[0088] Where q0 is the minimum operating flow rate of the alkali pump; n is the minimum number of alkali replacements per hour, Q(n) = V e *n, V e It is the effective liquid volume of the system, V = V c +V a n should not be too small, as a small n will lead to uneven heat distribution and the accumulation of impurities in the system. Preferably, n min Take 5-10. V c For the system hydrogen-side liquid volume, V a This represents the volume of the liquid on the oxygen side of the system.

[0089] Based on the above steps, the minimum allowable operating pressure and minimum alkali flow rate of the water electrolysis hydrogen production system at the current moment have been obtained. The next step is to determine the lower limit of power based on the minimum operating pressure and minimum alkali flow rate.

[0090] As one feasible approach, when determining the power lower limit based on the minimum operating pressure and minimum alkali flow rate, the mapping relationship between the hydrogen content in oxygen (which can be expressed as HTO, referring to the hydrogen content mixed in the gas-oxygen mixture at the outlet of the gas-liquid separator on the anode side (oxygen side) of the water electrolysis hydrogen production system) and the minimum operating pressure, minimum alkali flow rate, temperature, and current value is obtained. Based on the minimum operating pressure and minimum alkali flow rate, and combined with the mapping relationship, the current value I1 of the water electrolysis hydrogen production system is determined when the hydrogen content in oxygen is less than a preset content threshold (preferably 2%) at the current temperature. The number of cells N and the cell voltage U1 of the electrolyzer corresponding to the water electrolysis hydrogen production system are obtained. The power lower limit P is calculated based on the number of cells, cell voltage, and current value. min , where P min =N*U1*I1.

[0091] For example, one form of the mapping relationship between the hydrogen content in oxygen and the minimum operating pressure, minimum alkali flow rate, temperature, and current value in a water electrolysis hydrogen production system is as follows:

[0092]

[0093] The parameters a1-a5 are determined by the structure of the electrolytic hydrogen production system and the physicochemical properties of the electrolyte and gas. Specifically:

[0094] a1 = DSAN / d

[0095] a2 = S / 4

[0096]

[0097] a4=V s,an V l,a S O2 V g,a / R

[0098]

[0099] Where: D is the effective diffusion coefficient of hydrogen through the membrane of the electrolytic hydrogen production system, S is the solubility of hydrogen in alkaline solution, d is the membrane thickness of the electrolytic hydrogen production system, A is the effective area of ​​the electrolytic hydrogen production chamber, N is the number of chambers in the electrolytic hydrogen production system, K is the permeability coefficient of the membrane of the electrolytic hydrogen production system, ζ is the dynamic viscosity of the electrolyte, F is the Faraday constant, and V s,an V is the total liquid volume on the anode side of the electrolytic hydrogen production system, R is the ideal gas constant, and V is the total liquid volume on the anode side. g,a V is the sum of the volume of the container above the liquid surface in the oxygen-side (anode-side) gas-liquid separator and the volume between the gas outlet pipe and the gas valve of the separator. l,a It is the liquid volume (S) inside the oxygen-side (anode-side) gas-liquid separator. O2It is the solubility of oxygen in alkaline solution.

[0100] Optionally, the lower limit of system power can also be determined experimentally. The specific method is as follows: Adjust the system to operate stably under rated conditions; reduce the system power, and simultaneously reduce the system pressure and flow rate; obtain the lower limit of power when the purity approaches the safety limit of 2%.

[0101] 2. Maximum power P max The methods for determining this include:

[0102] Obtain the maximum allowable voltage U2 of the electrode catalyst layer material in the water electrolysis hydrogen production system. Based on the maximum voltage U2, look up the voltage and current curve corresponding to the water electrolysis hydrogen production system (the working curve of the electrolysis hydrogen production cell, provided by the electrolyzer manufacturer or obtained experimentally) to determine the maximum current value I2 corresponding to the water electrolysis hydrogen production system. Calculate the first power upper limit P1 based on the number of cells N, the cell voltage U2, and the maximum current value I2, where P1 = N × U2 × I2.

[0103] Obtain the highest permissible operating temperature of the membrane material in the water electrolysis hydrogen production system, and obtain the power value corresponding to the maximum permissible flow rate of the cooling medium in the water electrolysis hydrogen production system at the highest temperature as the second power upper limit P2.

[0104] Among them, the heat dissipation Q of the water electrolysis hydrogen production system 散热 It is equal to the maximum heat exchange capacity of the cooling equipment.

[0105] Q 散热 =N(U2-U rev )×I2=c 比热容 ×q m ×△T

[0106] In the above formula, c 比热容 q represents the specific heat capacity of the cooling medium. m U represents the maximum flow rate of the cooling medium; ΔT represents the temperature difference of the cooling medium; U rev The neutral voltage of the electrolytic cell is 1.48V, and N is the number of cells.

[0107] The maximum operating temperature is determined based on the temperature tolerance of the diaphragm material and is specified by the diaphragm material manufacturer; for example, the Zirfon membrane commonly used in alkaline electrolyzers can withstand a maximum long-term operating temperature of 100 degrees Celsius. The cooling medium flow rate limit is determined based on the economic operating range of the heat exchange equipment and is specified by the equipment manufacturer.

[0108] After determining the first and second power limits based on different approaches, the minimum of the first and second power limits is taken as the power limit. That is, P max =min{P1,P2}.

[0109] Optionally, the upper limit of system power can also be determined experimentally. The specific method is as follows: Adjust the system to operate stably under rated conditions, and adjust the pressure to the minimum allowable pressure; increase the system current and record the voltage / temperature; when the voltage / temperature approaches the maximum allowable voltage / temperature, the upper limit of power is obtained.

[0110] 3. Maximum power increase rate v + P,maa The methods for determining this include:

[0111] The difference between the maximum liquid level difference of the system and the initial liquid level difference of the water electrolysis hydrogen production system at the current moment is obtained as the allowable change value of the liquid level difference ΔLv. Combined with the mapping relationship between the allowable change value of the liquid level difference ΔLv and the power rise rate, the first power rise rate v of the water electrolysis hydrogen production system during the power rise process at the current moment is obtained. + P,1 .

[0112] For example, the mapping relationship between the allowable change in liquid level difference ΔLv and the power rise rate is expressed as follows:

[0113] △Lv=f1(v + P,1 ,P)

[0114] f1 represents the relationship between the change in liquid level difference between the hydrogen separator and the oxygen separator, the maximum rate of power change, the final value of power change P (amplitude), and the pressure setpoint at the moment of power change during the power change process. It can be obtained experimentally or through empirical formulas. For example, one form is as follows:

[0115] △Lv=(kRT×v + P,1 ×(△t 11 ) 2 +V g,a (p-p0))(1 / V g,a -2 / V g,c ) / ρg

[0116] in, N is the number of chambers in the electrolytic hydrogen production system, F is the Faraday constant, U is the chamber voltage (here, U is taken as a constant due to its low variation range, U = 1.6-2.0V), ρ is the electrolyte density, g is the acceleration due to gravity, and V is the total mass of the hydrogen produced. g,c V is the volume of the hydrogen-side gas in the system. g,a is the oxygen-side gas volume of the system, R is the ideal gas constant, T is the temperature, p is the pressure setpoint at the moment the power change occurs, and p0 is the initial pressure value.

[0117] Wherein, △t 11 =(P-P0) / v+ P,1 P-P0 is Δt 11 The power change before and after.

[0118] The difference between the maximum gas purity and the initial gas purity of the water electrolysis hydrogen production system at the current moment is obtained as the allowable change value Δw for gas purity. Combined with the mapping relationship between the allowable change value Δw and the power increase rate, the second power increase rate v of the water electrolysis hydrogen production system during the power increase process at the current moment is obtained. + P,2 .

[0119] For example, the mapping relationship between the allowable variation value of gas purity Δw and the rate of power increase is expressed as follows:

[0120] △w=f2(v + p,2 ,P,p,Q,τ p )

[0121] F2 represents the changes in gas purity (hydrogen in oxygen) and the maximum rate of power change during the power change process, the final value of power change P (amplitude), the pressure setpoint p at the moment the power change occurs, the alkali solution flow rate setpoint Q, and the alkali solution pump delay τ. p The relationship between them can be obtained through experiments or empirical formulas.

[0122] For example, one form is as follows:

[0123] △w=max{f(P1,p1,Q1),f(P2,p2,Q2),f(P3,p3,Q3)}

[0124] The form of f can be seen in the above text:

[0125]

[0126] (where P1, p1, Q1 represent τ respectively) p ,△t 21 Δt2, power, pressure, alkali flow rate, τ p ,△t 21 △t2 represents three time intervals in which p and Q change, where 0-τ p During the time period, due to the control delay, the flow rate of the alkali pump changes from Q0 to Q, at τ p The pressure changes to Q at time 0 and remains there. During the period from 0 to Δt2, after setting the pressure value to p, the pressure slowly changes from p0 to p. This change is influenced by the gas volume and power (i.e., the amount of gas produced) on the anode side. The pressure changes at time Δt2 become p. Pressure changes often lag behind power changes; therefore, Δt2 > Δt. 21 ,△t 21=(P-P0) / v + P,2 (This represents the time required for the power change to occur.)

[0127] in:

[0128] P1 = P0 + v + P,2 ×(τ e From this, the corresponding current can be obtained (based on the voltage and current curve of the water electrolysis hydrogen production system (the working curve of the electrolysis hydrogen production electrolyzer, provided by the electrolyzer manufacturer or obtained experimentally), the corresponding point on the curve where the product of voltage and current equals P1 is obtained), and the current value is substituted into f for calculation.

[0129] p1 = kRT × v + P,2 ×(τ e ) 2 / 2V g,a +p0;

[0130] Q1 = Q

[0131] P2 = P;

[0132] p2 = kRT × v + P,2 ×(△t 21 ) 2 / 2V g,a +p0, where △t 21 =(P-P0) / v + P,2 ;

[0133] Q2 = Q

[0134] P3 = P;

[0135] p3 = p;

[0136] Q3 = Q

[0137] Furthermore, the first power increase rate v + P,1 With the second power rise rate v + P,2 The minimum value is used as the upper limit of the power increase rate v at the current moment. + P,max 。 Represented as v + P,max =min{v + P,1 ,v + P,2}

[0138] 4. Maximum rate of power decrease v -P,max The methods for determining this include:

[0139] The first step is to obtain the difference between the maximum liquid level difference of the system and the initial liquid level difference of the water electrolysis hydrogen production system at the current moment as the allowable change value of the liquid level difference. Then, based on the mapping relationship between the allowable change value of the liquid level difference and the power decrease rate, the first power decrease rate v of the water electrolysis hydrogen production system during the power decrease process at the current moment is obtained. - P,1 The specific formula is the same as the method for determining the rate of power increase, except that the corresponding rate is changed to a decrease.

[0140] The second step involves obtaining the difference between the maximum gas purity and the initial gas purity of the water electrolysis hydrogen production system at the current moment as the allowable variation value of gas purity. Then, combining this allowable variation value with the power decrease rate, the second power decrease rate v of the water electrolysis hydrogen production system during the power decrease process at the current moment is obtained. - P,2 The specific formula is the same as the method for determining the rate of power increase, except that the corresponding rate is changed to a decrease.

[0141] The first power decrease rate v - P,1 With the second power decrease rate v - p,2 The minimum value is used as the upper limit of the power decrease rate v at the current moment. - P,max 。 Represented as v - P,max =min{v - P,1 ,v - P,2}

[0142] In S202, the rated hydrogen production power P of the water electrolysis hydrogen production unit is... H The calculation formula is:

[0143] P H =max(p s1 -p L1 ).

[0144] In the above formula, P H p is the rated hydrogen production power of the water electrolysis hydrogen production unit. s1 p represents the typical daily power output of the power generation unit. L1 This represents the typical daily power requirement of the electrical load unit.

[0145] That is, the rated hydrogen production capacity of the water electrolysis hydrogen production unit is equal to the maximum hourly difference between the power generation of the microgrid power generation system and the power consumption of the electricity load on a typical day, and the output capacity of the water electrolysis hydrogen production system has the ability to compensate for the mismatch between power generation and consumption. If the output of the microgrid power generation system and the electricity load are matched on multiple typical days, then P H The maximum value among these typical daily matching calculations should be taken.

[0146] In S202, the formula for calculating the rated power range of the energy storage battery unit is as follows:

[0147] P E >=P min

[0148] In the above formula, P E P is the rated power of the energy storage battery cell. min This is the lower power limit for the water electrolysis hydrogen production unit.

[0149] In S202, the formula for calculating the rated capacity range of the energy storage battery unit is as follows:

[0150] Q E >=max{Q +min Q -min}

[0151] in:

[0152]

[0153] P = t / t PH+ ×P min ;

[0154] t PH+ =P min / v + P,max

[0155]

[0156] p s -p l -P=t / t P- ×(p s -p l -P) tp-

[0157] t P- =(p s -p l -P) tp- / (△P (s-L)max- -p - P,max )

[0158] Among them, Q E The rated capacity of the energy storage battery cell, (p s -p l -P) tp- Based on typical daily curves of the power generation system and power load, this represents the maximum reduction in the power load difference and the adjustment deviation at the end of the load reduction process when the electrolytic hydrogen production system adjusts at its maximum rate of decline during the load reduction process; △P (s-L)max- This is the maximum rate at which the difference between power generation and consumption load decreases; p s -p l The initial value, final value, and t of -P p- , △P (s-L)max- This is determined by the characteristics of microgrid systems. Preferably, p s -p l The initial value of -P is 0.

[0159] That is: the rated power P of the energy storage battery unit E and battery rated capacity Q E It should be able to fully meet the following requirements:

[0160] 1) The rated power of the battery shall not be lower than the lower limit of the power of the water electrolysis hydrogen production unit;

[0161] 2) The rated capacity of the battery shall not be less than the power consumed by the water electrolysis hydrogen production unit from startup to minimum operating power.

[0162] 3) The rated capacity of the battery shall not be less than the amount of electricity that needs to be compensated after the electrolytic hydrogen production system has compensated at the maximum power drop rate under the maximum drop rate and depth of the difference between power generation and consumption load.

[0163] In S204, during the microgrid system capacity planning and operation scheduling process, based on the limitations of microgrid power generation system output and electricity demand, and considering the need for flexible control of the hydrogen electrolysis unit and the investment requirements of the energy storage battery unit, the most economical solution is selected. When predicting the cost optimization based on the preset coordinated working modes of the hydrogen electrolysis unit and the energy storage battery unit, the corresponding cost optimization function is:

[0164] C = C H +C E +C G +C dPH -R H

[0165] Where: C is the cost calculated in the current optimization process, C H For the total lifecycle cost of a water electrolysis hydrogen production unit, C E For the cost of energy storage battery cells over their entire life cycle, C G C represents the total cost of electricity consumption over the entire lifecycle of the power grid. dPHThe cost of all power regulation incurred during the entire lifecycle of the water electrolysis hydrogen production unit is the sum of all power regulation costs over the entire lifecycle. The cost of each power regulation is related to the magnitude and speed of the power regulation. R H This refers to the revenue from the sale of hydrogen throughout its entire lifecycle.

[0166] C H The corresponding calculation formula is:

[0167] C H =a×e H ×P H +b×∫p H dt

[0168] Where 'a' is the depreciation rate of the water electrolysis hydrogen production unit over its entire life cycle, a = 0.9 - 1; e H This refers to the fixed investment cost per unit capacity of a water electrolysis hydrogen production unit, typically e H =1500-3000 yuan / kW; P H ∫p represents the rated hydrogen production power of the water electrolysis hydrogen production unit, and b is the cost per unit of hydrogen production power consumption, typically 0.02-0.05 yuan / kWh; H dt is the total energy consumption for hydrogen production via electrolysis over its entire lifecycle, expressed in kWh.

[0169] C E The corresponding calculation formula is:

[0170] C E =c×e×Q E +d×∫|p E |dt

[0171] Where c is the depreciation rate of the battery over its entire life cycle, c = 1.5-2 (the battery needs to be replaced during its entire life cycle); e is the fixed investment cost per unit capacity energy storage battery cell, generally e = 900-1500 yuan / kWh; Q E Where d is the rated capacity of the energy storage battery cell, and d is the cost per unit charge / discharge capacity of the battery, typically 0.002-0.005 yuan / kWh; ∫|p E |dt is the total charge and discharge capacity of the energy storage battery unit throughout its entire life cycle, expressed in kWh.

[0172] C E The corresponding calculation formula is:

[0173] C E =c×e×Q E +d×∫|p E |dt

[0174] Where c is the depreciation rate of the battery over its entire life cycle, e is the fixed investment cost per unit capacity of the energy storage battery cell, and Q is the fixed investment cost per unit capacity of the energy storage battery cell.E Let d be the rated capacity of the energy storage battery cell, and ∫|p be the cost per unit charge / discharge capacity of the battery. E |dt is the total charge and discharge capacity of the energy storage battery unit throughout its entire life cycle, expressed in kWh.

[0175] C dPH The corresponding calculation formula is:

[0176] C dPH =∑(c1×△w+c2×△Lv+c3×△Q+c4×△Q) W +c5×△v)

[0177] Among them, C dPH This represents the cost of all power adjustments incurred throughout the entire lifecycle of the water electrolysis hydrogen production unit. For any single adjustment process, c1 is a coefficient considering the safety risks of gas post-treatment and gas contamination, with Δw representing the change in gas purity; c2 is a coefficient considering the safety risks of increased liquid level difference, with ΔLv representing the change in liquid level difference; c3 is the cost coefficient for adjusting the alkali flow rate, with ΔQ representing the change in alkali flow rate; and c4 is the cost coefficient for adjusting the cooling medium flow rate, with ΔQ representing the change in cooling medium flow rate. W The value represents the change in cooling medium flow rate, c5 is a coefficient considering valve operation costs, and Δv is the change in gas valve opening.

[0178] R H The corresponding calculation formula is:

[0179] R H =k×e2×∫p H dt

[0180] Where k is the amount of hydrogen produced per unit of hydrogen production electricity, generally k = 0.2 Nm3 / kWh; e2 is the selling price of hydrogen per unit, generally e2 = 1-5 yuan / Nm3.

[0181] Furthermore, in S204, the preset coordinated operating modes corresponding to the water electrolysis hydrogen production unit and the energy storage battery unit include:

[0182] This application requires combining historical power generation data and historical electricity load data to predict the total life cycle cost over the entire life cycle. That is, by combining historical power generation data and historical electricity load data, the relationship between power generation and electricity load is compared in real time at set points throughout the life cycle.

[0183] 1) If the power generation is greater than the power consumption, then obtain the first difference between the power generation and the power consumption.

[0184] If the first difference is less than the power limit of the water electrolysis hydrogen production unit, then the water electrolysis hydrogen production unit is controlled to produce hydrogen according to the first difference.

[0185] If the first difference is equal to the upper limit of the power of the water electrolysis hydrogen production unit, then the water electrolysis hydrogen production unit is controlled to produce hydrogen according to the upper limit of the power.

[0186] If the first difference is greater than the power limit of the water electrolysis hydrogen production unit, the water electrolysis hydrogen production unit is controlled to produce hydrogen according to the power limit, and the difference between the first difference and the power limit is obtained as the second difference.

[0187] Obtain the maximum charging power of the energy storage battery unit.

[0188] If the second difference is less than the battery's maximum charging power, the energy storage battery unit is controlled to charge according to the second difference.

[0189] If the second difference is greater than or equal to the battery's maximum charging power, then the energy storage battery unit is controlled to charge according to the battery's maximum charging power.

[0190] 2) If the power generation is less than the power load, the power of the water electrolysis hydrogen production unit is controlled to be 0, and the third difference between the power generation and the power load is obtained.

[0191] If the third difference is less than the rated power of the energy storage battery unit, then the energy storage battery unit is controlled to supply power to the electrical load unit according to the third difference and the power generation unit is controlled to supply power according to the power generation.

[0192] If the third difference is equal to the rated power of the energy storage battery unit, then the energy storage battery unit is controlled to supply power to the electrical load unit according to the rated power of the battery, and the power generation unit is controlled to supply power according to the power generation capacity.

[0193] If the third difference is greater than the rated power of the energy storage battery unit, then the fourth difference between the third difference and the rated power of the battery is obtained.

[0194] Power is cut off from the grid based on the fourth difference, and the energy storage battery unit is controlled to supply power according to the rated power of the battery, the power generation unit is controlled to supply power according to the power generation capacity, and the power load unit is supplied in conjunction with the grid power cut-off.

[0195] Furthermore, in S204, during the cost optimization prediction process based on the preset coordinated operating modes of the water electrolysis hydrogen production unit and the energy storage battery unit, the following requirements need to be met:

[0196] p s +p E =p H +p L +p G ;

[0197] |p E |≤P E

[0198] pH ∈{P min ,P max}

[0199] v H ∈{v - P,max ,v + P,max}

[0200] Q 储能 ≤Q E

[0201] Where, p s p represents the output power of the power generation unit. E p represents the output power of the energy storage battery unit. H p represents the output power of the water electrolysis hydrogen production unit. L p is the power required by the electrical load unit. G P represents the incoming power from the power grid. E P is the rated power of the energy storage battery cell. min P is the lower limit of the power output of the water electrolysis hydrogen production unit. max v is the upper limit of the power of the water electrolysis hydrogen production unit. H The power regulation speed of the water electrolysis hydrogen production unit, v - P,max v is the upper limit of the power decrease rate of the water electrolysis hydrogen production unit. + P,max Q represents the upper limit of the power increase rate of the water electrolysis hydrogen production unit; 储能 Q represents the current energy storage capacity of the energy storage battery cell. E This refers to the rated capacity of the energy storage battery unit.

[0202] Where: p s ,p L Determined by the availability of new energy resources and electricity demand, p H ,p E Adjust flexibly based on the changes in the two above.

[0203] This application achieves at least the following beneficial effects:

[0204] 1. Under the conditions of rising and falling power in the microgrid, the energy storage battery unit can bear the balance demand after the water electrolysis hydrogen production unit adjusts its power at the maximum power speed, thereby reducing the number of times the water electrolysis hydrogen production unit is shut down in an emergency.

[0205] 2. The microgrid is controlled in a coordinated manner by the water electrolysis hydrogen production unit and the energy storage battery unit, giving full play to the capacity regulation function of the water electrolysis hydrogen production unit and the rapid power regulation function of the energy storage battery unit.

[0206] 3. Based on the operating characteristics of the microgrid's power generation and consumption loads, determine the flexible adjustment range requirements of the electrolysis hydrogen production unit and the capacity requirements of the energy storage module to reduce the overall cycle cost.

[0207] 4. The operation mode of the microgrid was determined based on its structural characteristics, meeting the requirements for safe, stable, and efficient operation of the microgrid.

[0208] Figure 3 This application illustrates an optimized configuration device for a hydrogen-electric-coupled microgrid system, as shown in the schematic diagram. Figure 3 As shown, the optimized configuration device 300 for the hydrogen-electric coupled microgrid system includes a first acquisition module 301, a second acquisition module 302, a collection module 303, a cost optimization module 304, a third acquisition module 305, and a configuration module 306, wherein:

[0209] The first acquisition module 301 is used to acquire the adjustment and limiting parameters of the water electrolysis hydrogen production unit. The adjustment and limiting parameters include the upper limit of power, the lower limit of power, the upper limit of power increase rate, and the upper limit of power decrease rate of the water electrolysis hydrogen production unit.

[0210] The second acquisition module 302 is used to acquire the rated hydrogen production power of the water electrolysis hydrogen production unit, the rated power range of the energy storage battery unit, and the rated capacity range of the battery, based on the adjustment and limiting parameters.

[0211] The collection module 303 is used to collect historical power generation data corresponding to the power generation unit and historical power load data corresponding to the power load unit.

[0212] The cost optimization module 304 is used to predict costs based on historical power generation data, historical power load data, hydrogen production rated power, battery rated power range, and battery rated capacity range, according to the preset coordinated working mode corresponding to the water electrolysis hydrogen production unit and the energy storage battery unit.

[0213] The third acquisition module 305 is used to acquire the battery rated power and battery rated capacity corresponding to the lowest cost obtained after cost optimization.

[0214] Configuration module 306 is used to optimize the configuration of the hydrogen-electric coupling microgrid system based on the rated power of hydrogen production, the rated power of the battery, and the rated capacity of the battery.

[0215] To achieve the above embodiments, this application also proposes an electronic device 400, such as... Figure 4 As shown, the electronic device 400 includes a processor 401 and a memory 402 communicatively connected to the processor. The memory 402 stores instructions that can be executed by at least one processor. The instructions are executed by at least one processor 401 to implement the optimized configuration method of the hydrogen-electric coupling microgrid system as shown in the above embodiment.

[0216] To implement the above embodiments, this application also proposes a non-transitory computer-readable storage medium storing computer instructions, wherein the computer instructions are used to enable a computer to implement the optimized configuration method of the hydrogen-electric coupled microgrid system as shown in the above embodiments.

[0217] To implement the above embodiments, this application also proposes a computer program product, including a computer program that, when executed by a processor, implements the optimized configuration method for a hydrogen-electric coupled microgrid system as shown in the above embodiments.

[0218] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0219] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0220] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0221] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. An optimized configuration method for a hydrogen-electric coupled microgrid system, characterized in that, The hydrogen-electric coupling microgrid system includes a power generation unit, a water electrolysis hydrogen production unit, an energy storage battery unit, and an electrical load unit. The method includes: Obtain the adjustment and limiting parameters of the water electrolysis hydrogen production unit, the adjustment and limiting parameters including the upper limit of power, the lower limit of power, the upper limit of power increase rate, and the upper limit of power decrease rate of the water electrolysis hydrogen production unit; Based on the adjustment and limiting parameters, obtain the rated hydrogen production power of the water electrolysis hydrogen production unit, the rated power range of the energy storage battery unit, and the rated capacity range of the battery. Collect historical power generation data corresponding to the power generation unit and historical power load data corresponding to the power load unit; Based on the historical power generation data, the historical power load data, the rated power of hydrogen production, the rated power range of the battery, and the rated capacity range of the battery, cost optimization prediction is performed according to the preset coordinated working mode corresponding to the water electrolysis hydrogen production unit and the energy storage battery unit. The lowest cost corresponding to the battery's rated power and rated capacity is obtained after cost optimization. The hydrogen-electric coupling microgrid system is optimized and configured based on the rated hydrogen production power, the rated battery power, and the rated battery capacity. Wherein, when performing cost optimization prediction according to the preset coordinated working mode corresponding to the water electrolysis hydrogen production unit and the energy storage battery unit, the corresponding cost optimization function is: in: The cost calculated in the current optimization process. The cost of the water electrolysis hydrogen production unit over its entire lifecycle. The cost of the energy storage battery unit over its entire lifecycle. The cost of electricity consumption over the entire life cycle of the power grid. The cost of all power adjustments incurred by the water electrolysis hydrogen production unit throughout its entire lifecycle is the sum of all power adjustment costs over the entire lifecycle. The cost of each power adjustment is related to the magnitude and speed of the power adjustment. This refers to the revenue from the sale of hydrogen throughout its entire lifecycle.

2. The method according to claim 1, characterized in that, The The corresponding calculation formula is: =a e H P H +b Where 'a' is the depreciation rate of the water electrolysis hydrogen production unit over its entire life cycle, and 'e' is the depreciation rate of the unit. H P is the fixed investment cost per unit capacity of a water electrolysis hydrogen production unit. H b is the rated hydrogen production power of the water electrolysis hydrogen production unit, and b is the cost per unit hydrogen production power consumption. It is the total electricity consumption for hydrogen production via electrolysis throughout its entire lifecycle, expressed in kWh.

3. The method according to claim 2, characterized in that, The The corresponding calculation formula is: C E =c e Q E +d Where c is the depreciation rate of the battery over its entire life cycle, e is the fixed investment cost per unit capacity of the energy storage battery cell, and Q is the fixed investment cost per unit capacity of the energy storage battery cell. E Where d is the rated capacity of the energy storage battery unit, and d is the cost per unit charge / discharge capacity of the battery. It is the total charge and discharge capacity of the energy storage battery unit throughout its entire life cycle, expressed in kWh.

4. The method according to claim 3, characterized in that, The The corresponding calculation formula is: =s1 - s2 Where s1 is the cost of transmitting electricity to the grid, in yuan / kWh. If grid-connected electricity sales are permitted, then s1 < 0, and the absolute value of s1 is the grid-connected electricity sales price; if grid-connected electricity sales are not permitted, then s1 > 0, and the absolute value of s1 is the penalty value for excess electricity generated per unit of grid connection. s2 is the cost of transferring electricity from the grid, in yuan / kWh. If grid-connected electricity sales are permitted, then s2 > 0, and the absolute value of s2 is the price of purchasing electricity from the grid; if grid-connected electricity sales are not permitted, then s2 < 0, and the absolute value of s2 is the penalty value for the amount of electricity transferred to the grid. This represents the amount of electricity transmitted from the microgrid system to the main grid. Positive values ​​indicate power transmission to the grid, while negative values ​​indicate power being cut off from the grid.

5. The method according to claim 4, characterized in that, The and The corresponding calculation formulas are as follows: = (c1 △w+ c2 △Lv+c3 △Q+c4 △Q W +c5 △v) in, This represents the cost of all power adjustments incurred during the entire lifecycle of the water electrolysis hydrogen production unit. For any given adjustment process, c1 is a coefficient considering the safety risks of gas post-treatment and gas mixing, where Δw is the change in gas purity; c2 is a coefficient considering the safety risks of increased liquid level difference, where ΔLv is the change in liquid level difference; c3 is the cost coefficient for adjusting the alkali flow rate, where ΔQ is the change in alkali flow rate; and c4 is the cost coefficient for adjusting the cooling medium flow rate, where ΔQ is the change in cooling medium flow rate. W For the change in cooling medium flow rate, c5 is a coefficient considering the valve operation cost, and Δv is the change in gas valve opening. R H = k e2 Where k is the amount of hydrogen produced per unit of hydrogen production electricity; e2 is the selling price of hydrogen per unit.

6. The method according to claim 5, characterized in that, The preset coordinated operating modes corresponding to the water electrolysis hydrogen production unit and the energy storage battery unit include: By combining the historical power generation data and the historical power load data, the relationship between power generation and power load is compared in real time at set time points within the life cycle. If the power generation is greater than the power consumption, then the first difference between the power generation and the power consumption is obtained; If the first difference is less than the power limit of the water electrolysis hydrogen production unit, then the water electrolysis hydrogen production unit is controlled to produce hydrogen according to the first difference; If the first difference is equal to the upper limit of the power of the water electrolysis hydrogen production unit, then the water electrolysis hydrogen production unit is controlled to produce hydrogen according to the upper limit of the power.

7. The method according to claim 6, characterized in that, The method further includes: If the first difference is greater than the power limit of the water electrolysis hydrogen production unit, then the water electrolysis hydrogen production unit is controlled to produce hydrogen according to the power limit, and the difference between the first difference and the power limit is obtained as the second difference. Obtain the maximum charging power of the energy storage battery unit; If the second difference is less than the maximum charging power of the battery, then the energy storage battery unit is controlled to charge according to the second difference; If the second difference is greater than or equal to the maximum charging power of the battery, then the energy storage battery unit is controlled to charge according to the maximum charging power of the battery.

8. The method according to claim 7, characterized in that, The method further includes: If the power generation is less than the power load, the power of the water electrolysis hydrogen production unit is controlled to be 0, and the third difference between the power generation and the power load is obtained. If the third difference is less than the rated power of the energy storage battery unit, then the energy storage battery unit is controlled to supply power to the electrical load unit according to the third difference and the power generation unit is controlled to supply power according to the power generation power. If the third difference is equal to the rated power of the energy storage battery unit, then the energy storage battery unit is controlled to supply power to the electrical load unit according to the rated power of the battery, and the power generation unit is controlled to supply power to the electrical load unit according to the power generation power. If the third difference is greater than the rated power of the energy storage battery unit, then a fourth difference between the third difference and the rated power of the battery is obtained. Based on the fourth difference, power is cut off from the grid, and the energy storage battery unit is controlled to supply power to the power load unit in accordance with the rated power of the battery, the power generation unit is controlled to supply power in accordance with the power generation power, and the power is cut off from the grid.

9. The method according to claim 8, characterized in that, In the process of cost optimization prediction according to the preset coordinated working mode corresponding to the water electrolysis hydrogen production unit and the energy storage battery unit, the following requirements need to be met: p s +p E =p H +p L +p G ; |p E | P E p H {P min ,P max } v H } Q 储能 Q E Where, p s p represents the output power of the power generation unit. E p represents the output power of the energy storage battery unit. H p is the output power of the water electrolysis hydrogen production unit. L p represents the required power of the electrical load unit. G P represents the incoming power from the power grid. E P represents the rated power of the energy storage battery unit. min P is the lower limit of the power of the water electrolysis hydrogen production unit. max This is the upper limit of the power of the water electrolysis hydrogen production unit. v H The power adjustment speed of the water electrolysis hydrogen production unit. This is the upper limit of the power decrease rate of the water electrolysis hydrogen production unit. Q represents the upper limit of the power increase rate of the water electrolysis hydrogen production unit; 储能 Q represents the current energy storage capacity of the energy storage battery unit. E The rated capacity of the energy storage battery unit is given.

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