Capacity configuration method and device for off-grid wind-solar hydrogen production ammonia synthesis system

Abstract

The invention provides an off-grid wind and light hydrogen production synthetic ammonia system capacity configuration method and device, and the method comprises the steps: determining the new energy generating capacity of a wind and light hydrogen production synthetic ammonia system, and calculating the maximum number of electrolytic cells with the electricity abandoning rate of 0 of the wind and light hydrogen production synthetic ammonia system based on the new energy generating capacity; in the process of simulating operation of the wind-solar hydrogen production ammonia synthesis system based on the electrolytic bath-energy storage cooperative operation strategy, reducing the number of electrolytic baths on the basis of the maximum number of the electrolytic baths, and determining the optimal number of the electrolytic baths meeting the power abandoning rate constraint; calculating the amount of hydrogen prepared in each time period in the production cycle according to the new energy generating capacity, and determining the amount of hydrogen consumed by ammonia synthesis in each time period based on an ammonia synthesis load prediction adjustment strategy; and on the basis of the hydrogen amount prepared in each time period and the hydrogen amount consumed by ammonia gas synthesis, the optimal number of gas storage tanks is determined by simulating operation of the wind-solar hydrogen production ammonia synthesis system. Therefore, on the basis of guaranteeing efficient operation of the system, the cost of the wind-solar hydrogen production and ammonia synthesis system is reduced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of hydrogen production and ammonia synthesis from renewable energy, and in particular to a capacity configuration method and device for an off-grid wind-solar hydrogen production and ammonia synthesis system. Background Art

[0002] The off-grid wind-solar hydrogen-to-ammonia system uses renewable energy as the electricity for the production process of hydrogen and nitrogen raw gas, while the operation electricity is supplied by the grid to ensure the safety of chemical production. This design not only makes full use of renewable energy, but also ensures the stability of key operation links through grid power supply.

[0003] Another key element of the off-grid wind-solar hydrogen production and ammonia synthesis system is the configuration of electrochemical energy storage equipment and hydrogen storage equipment to achieve the balance of power and electricity within the system and the balance of production and sales of hydrogen and nitrogen raw gas, thereby ensuring the continuity and safety of chemical production. Summary of the invention

[0004] The present disclosure aims to solve one of the technical problems in the related art at least to some extent.

[0005] The first embodiment of the present disclosure provides a capacity configuration method for an off-grid wind-solar hydrogen production and ammonia synthesis system, comprising:

[0006] Determine the renewable energy power generation of the wind-solar hydrogen production and ammonia synthesis system, and calculate the maximum number of electrolyzers with a power abandonment rate of 0 for the wind-solar hydrogen production and ammonia synthesis system based on the renewable energy power generation;

[0007] In the process of simulating the operation of the wind-solar hydrogen production and ammonia synthesis system based on the electrolyzer-energy storage coordinated operation strategy, the number of electrolyzers is reduced on the basis of the maximum number of electrolyzers to determine the optimal number of electrolyzers that meets the power abandonment rate constraint;

[0008] Calculate the amount of hydrogen produced in each period of the production cycle based on the amount of electricity generated by renewable energy, and determine the amount of hydrogen consumed by ammonia synthesis in each period based on the synthetic ammonia load forecast adjustment strategy;

[0009] Based on the amount of hydrogen prepared in each time period and the amount of hydrogen consumed for synthesizing ammonia, the wind-solar hydrogen production and ammonia synthesis system is simulated and operated to determine the optimal number of gas storage tanks.

[0010] In a possible implementation of an embodiment of one aspect of the present application, the electrolyzer-energy storage coordinated operation strategy includes:

[0011] The electrolyzer is started by comparing the renewable energy power generation in each period with the rated power of the electrolyzer, and the energy storage charging and discharging is determined based on the status of the energy storage device.

[0012] In a possible implementation of an embodiment of one aspect of the present application, it also includes:

[0013] When the wind-solar hydrogen production and ammonia synthesis system is running after capacity configuration is completed, the actual amount of hydrogen consumed in each time period is determined to predict the amount of ammonia synthesized within the production cycle based on the actual amount of hydrogen consumed in each time period.

[0014] In a possible implementation of an embodiment of one aspect of the present application, the maximum number of electrolyzers for calculating the wind-solar hydrogen production and ammonia synthesis system with a power abandonment rate of 0 based on the renewable energy power generation includes:

[0015] In the process of simulating the operation of the wind-solar hydrogen production and ammonia synthesis system based on the electrolyzer-energy storage coordinated operation strategy, the charging and discharging actions of the energy storage equipment and the electrolyzer power are judged according to the new energy power generation power and the capacity status of the energy storage equipment, and the number of electrolyzers finally started is determined as the maximum number of electrolyzers with a power abandonment rate of 0 for the wind-solar hydrogen production and ammonia synthesis system.

[0016] The second embodiment of the present disclosure provides a capacity configuration device for an off-grid wind-solar hydrogen production and ammonia synthesis system, comprising:

[0017] The first determination module is used to determine the renewable energy power generation of the wind-solar hydrogen production and ammonia synthesis system, so as to calculate the maximum number of electrolyzers with a power abandonment rate of 0 for the wind-solar hydrogen production and ammonia synthesis system based on the renewable energy power generation;

[0018] The first simulation operation module is used to simulate the operation of the wind-solar hydrogen production and ammonia synthesis system based on the electrolyzer-energy storage coordinated operation strategy, reduce the number of electrolyzers on the basis of the maximum number of electrolyzers, and determine the optimal number of electrolyzers that meets the power abandonment rate constraint;

[0019] The second determination module is used to calculate the amount of hydrogen produced in each period of the production cycle according to the power generation of new energy, and determine the amount of hydrogen consumed by the synthesis of ammonia in each period based on the synthetic ammonia load prediction adjustment strategy;

[0020] The second simulation operation module is used to simulate the operation of the wind-solar hydrogen production and ammonia synthesis system to determine the optimal number of gas storage tanks based on the amount of hydrogen prepared in each time period and the amount of hydrogen consumed for synthesizing ammonia.

[0021] In a possible implementation of an embodiment of one aspect of the present application, the electrolyzer-energy storage coordinated operation strategy includes:

[0022] The electrolyzer is started by comparing the renewable energy power generation in each period with the rated power of the electrolyzer, and the energy storage charging and discharging is determined based on the status of the energy storage device.

[0023] In a possible implementation of an embodiment of one aspect of the present application, it also includes:

[0024] The prediction module is used to determine the actual amount of hydrogen consumed in each time period when the wind-solar hydrogen production and ammonia synthesis system is running after capacity configuration is completed, so as to predict the amount of ammonia synthesized within the production cycle based on the actual amount of hydrogen consumed in each time period.

[0025] In a possible implementation of an embodiment of an aspect of the present application, the first determining module is used to:

[0026] In the process of simulating the operation of the wind-solar hydrogen production and ammonia synthesis system based on the electrolyzer-energy storage coordinated operation strategy, the charging and discharging actions of the energy storage equipment and the electrolyzer power are judged according to the new energy power generation power and the capacity status of the energy storage equipment, and the number of electrolyzers finally started is determined as the maximum number of electrolyzers with a power abandonment rate of 0 for the wind-solar hydrogen production and ammonia synthesis system.

[0027] The third aspect embodiment of the present disclosure proposes an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the capacity configuration method of the off-grid wind-solar hydrogen production and ammonia synthesis system proposed in the first aspect embodiment of the present disclosure is implemented.

[0028] The fourth aspect embodiment of the present disclosure proposes a non-temporary computer-readable storage medium storing a computer program, which, when executed by a processor, implements the capacity configuration method of an off-grid wind-solar hydrogen production and ammonia synthesis system as proposed in the first aspect embodiment of the present disclosure.

[0029] The capacity configuration method, device and electronic equipment of the off-grid wind-solar hydrogen production and ammonia synthesis system provided by the present disclosure have the following characteristics:

[0030] Beneficial effects:

[0031] In the present application, the renewable energy power generation of the wind-solar hydrogen production and ammonia synthesis system is determined, and the maximum number of electrolyzers with a wind-solar hydrogen production and ammonia synthesis system abandonment rate of 0 is calculated based on the renewable energy power generation. Then, in the process of simulating the operation of the wind-solar hydrogen production and ammonia synthesis system based on the electrolyzer-energy storage coordinated operation strategy, the number of electrolyzers is reduced on the basis of the maximum number of electrolyzers to determine the optimal number of electrolyzers that meets the abandonment rate constraint. At the same time, the amount of hydrogen prepared in each time period during the production cycle is calculated based on the renewable energy power generation, and the amount of hydrogen consumed by ammonia synthesis in each time period is determined based on the ammonia synthesis load prediction adjustment strategy. Then, based on the amount of hydrogen prepared in each time period and the amount of hydrogen consumed by ammonia synthesis, the operation of the wind-solar hydrogen production and ammonia synthesis system is simulated to determine the optimal number of gas storage tanks. Therefore, the optimal number of electrolyzers is determined by simulating the operation system through the electrolyzer-energy storage coordinated operation strategy. At the same time, the wind-solar hydrogen production and ammonia synthesis system is simulated on the basis of determining the amount of hydrogen consumed by ammonia synthesis based on the ammonia load forecast adjustment strategy to determine the optimal number of gas storage tanks, achieve power balance and hydrogen-nitrogen raw gas production and sales balance, thereby reducing the cost of the wind-solar hydrogen production and ammonia synthesis system while ensuring the efficient operation of the system.

[0032] Additional aspects and advantages of the present disclosure will be given in part in the following description and in part will be obvious from the following description or learned through practice of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The above and / or additional aspects and advantages of the present disclosure will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0034] Figure 1 A schematic flow chart of a capacity configuration method for an off-grid wind-solar hydrogen production and ammonia synthesis system provided in an embodiment of the present disclosure;

[0035] Figure 2 A flowchart of a method for calculating the maximum number of electrolyzers to meet a system power abandonment rate of 0;

[0036] Figure 3 This is a schematic diagram of the corresponding relationship between the number of electrolytic cells and the power abandonment rate;

[0037] Figure 4 A flow chart of the method for determining the optimal number of electrolytic cells;

[0038] Figure 5 This is a schematic diagram of the relationship between the power and hydrogen production of a single electrolyzer;

[0039] Figure 6 A schematic flow chart of the synthetic ammonia load forecasting and adjustment strategy;

[0040] Figure 7 A schematic diagram of a capacity configuration device for an off-grid wind-solar hydrogen production and ammonia synthesis system provided in an embodiment of the present disclosure;

[0041] Figure 8 A block diagram of an exemplary computer device suitable for implementing embodiments of the present disclosure is shown. DETAILED DESCRIPTION

[0042] Embodiments of the present disclosure are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present disclosure, and should not be construed as limiting the present disclosure.

[0043] The following describes the capacity configuration method, device, computer equipment and storage medium of the off-grid wind-solar hydrogen production and ammonia synthesis system according to the embodiments of the present disclosure with reference to the accompanying drawings.

[0044] It should be noted that the executor of the off-grid wind-solar hydrogen production and ammonia synthesis system capacity configuration method in the embodiment of the present disclosure is an off-grid wind-solar hydrogen production and ammonia synthesis system capacity configuration device, which can be implemented by software and / or hardware, and the device can be configured in any electronic device.

[0045] In off-grid mode, the wind-solar hydrogen production and ammonia synthesis system consists of a photovoltaic power station model, a wind power station model, a water electrolysis hydrogen production model, a hydrogen ammonia synthesis model, and an energy storage device model.

[0046] Figure 1 This is a flow chart of the capacity configuration method of the off-grid wind-solar hydrogen production and ammonia synthesis system provided in the first embodiment of the present disclosure.

[0047] like Figure 1 As shown, the capacity configuration method of the off-grid wind-solar hydrogen production and ammonia synthesis system may include the following steps:

[0048] Step 101: Determine the renewable energy power generation of the wind-solar hydrogen production and ammonia synthesis system, and calculate the maximum number of electrolyzers with a power abandonment rate of 0 for the wind-solar hydrogen production and ammonia synthesis system based on the renewable energy power generation.

[0049] In this application, the wind-solar hydrogen production and ammonia synthesis system may include wind power stations, photovoltaic power stations, etc. Therefore, the renewable energy power generation includes the power output of wind power stations and photovoltaic power stations (i.e., output power or renewable energy power generation). For wind power stations that have been put into operation, their historical hourly power generation data is used as power generation data. For wind power stations that have not been put into operation, the power generation of the wind power station is calculated based on data such as wind speed, and its output power P wt It can be calculated by the following formula:

[0050]

[0051] Where: v is the real-time wind speed in the area where the wind power station is located; v ci is the cut-in wind speed; v co is the cut-out wind speed; v r is the rated wind speed; P wt,r is the rated power of the wind turbine; η1 and η2 are the mechanical transmission efficiency and power conversion efficiency respectively; ρ, A and C p They are air density, wind rotor area and wind energy utilization coefficient respectively.

[0052] The output power of a wind turbine is related to the wind speed, which basically follows the Weibull distribution:

[0053]

[0054] Where: v is the real-time wind speed; k is the shape parameter; c is the size parameter.

[0055] Using the principle of photovoltaic effect, photovoltaic array converts solar radiation into electrical energy through photoelectric effect. The power generation of photovoltaic power station is calculated based on temperature, solar irradiance and other data. Its output power P pv It can be calculated by the following formula:

[0056]

[0057] T C =T air +K*I t

[0058] Where: P pv For photovoltaic output; P sn is the rated output efficiency of photovoltaic; T c is the photovoltaic panel battery temperature; R c To set the light intensity to a specific intensity; I std is the light intensity per unit area; T stc is the battery temperature; I t is the actual light intensity at time t.

[0059] The output power of the photovoltaic array is related to the solar radiation intensity of the region, and the light intensity basically follows the Beta distribution:

[0060]

[0061] Where: I max is the maximum light intensity; α and β are shape parameters; μ is the average light intensity.

[0062] In the present application, the maximum number of electrolyzers for wind-solar hydrogen production and ammonia synthesis with a power abandonment rate of 0 is calculated based on the renewable energy power generation, including: in the process of simulating the operation of the wind-solar hydrogen production and ammonia synthesis system based on the electrolyzer-energy storage coordinated operation strategy, the charging and discharging action of the energy storage device and the electrolyzer power are judged according to the renewable energy power generation power and the capacity status of the energy storage device, and the number of electrolyzers finally started is determined as the maximum number of electrolyzers for wind-solar hydrogen production and ammonia synthesis with a power abandonment rate of 0.

[0063] For example, the planning strategy cycle is 8760 hours a year, and the renewable energy power generation and energy storage initial capacity are used as inputs. Through the coordinated operation of the electrolyzer and energy storage planning, the energy storage device charging and discharging and the electrolyzer power are judged according to the renewable energy power generation and energy storage device capacity status, and then the maximum number of electrolyzers n that can meet the system power abandonment rate of 0 is calculated. max .like Figure 2 As shown, whether the energy storage device is charged and discharged is determined according to the size of the new energy power generation. If the new energy power generation in period t is less than the minimum operating power of the electrolyzer and the energy storage device still cannot start the electrolyzer after discharging, the energy storage device is charged to store this part of the new energy power; otherwise, the energy storage device is discharged, and the electrolyzer is powered by the new energy power generation and energy storage device. If the new energy power generation in period t is between the upper and lower limits of the electrolyzer operating power and the capacity of the energy storage device does not reach the lower limit, the energy storage device is discharged, and the electrolyzer is powered by the new energy power generation and energy storage device; otherwise, the electrolyzer is powered by the new energy power generation. If the new energy power generation in period t is higher than the maximum operating power of the electrolyzer and the capacity of the energy storage device does not reach the lower limit, the energy storage device is discharged, and the electrolyzer is powered by the new energy power generation and energy storage device; otherwise, the electrolyzer is powered by the new energy power generation. Through the above cyclic judgment, the maximum number of electrolyzer startups within 8760 hours can be obtained. Figure 2 Medium new (t) is the power generated by renewable energy in period t, SOC(t) is the capacity of energy storage equipment in period t, P el,min is the lower limit of the electrolytic cell operating power, P el,max is the upper limit of the electrolytic cell operating power, P el (t) is the hydrogen production power during period t (i.e., electrolyzer load, electrolyzer output power).

[0064] Step 102: During the simulation of the operation of the wind-solar hydrogen production and ammonia synthesis system based on the electrolyzer-energy storage coordinated operation strategy, the number of electrolyzers is reduced on the basis of the maximum number of electrolyzers to determine the optimal number of electrolyzers that meets the power abandonment rate constraint.

[0065] In this application, the corresponding relationship between the number of electrolytic cells and the power abandonment rate is as follows: Figure 3As shown, the relationship can be described as follows: when the number of electrolyzers is sufficient, the utilization rate of renewable energy power generation in the hydrogen production system is 100%, that is, the power abandonment rate is 0. As the number of electrolyzer configurations gradually decreases, the power abandonment rate increases. Therefore, we can first solve the maximum number of electrolyzers that can make the system power abandonment rate 0, and then gradually reduce the number of electrolyzers. As the number of electrolyzers gradually decreases, the power abandonment rate increases, and the optimal number of electrolyzers that meet the power abandonment rate constraint can be calculated.

[0066] In the present application, the electrolyzer-energy storage coordinated operation strategy includes: starting the electrolyzer by comparing the renewable energy power generation in each time period with the rated power of the electrolyzer, and determining the energy storage charging and discharging according to the state of the energy storage device.

[0067] For example, based on the maximum number of electrolytic cells n max The calculation is performed with 8760 hours a year as the planning strategy cycle, and the number of electrolyzers, renewable energy power generation and initial energy storage capacity as input. The renewable energy power generation in different periods is compared with the rated power of n electrolyzers, and the charging and discharging of the energy storage equipment is judged according to the capacity status of the energy storage equipment, and the number of electrolyzers started and the power abandonment rate are calculated, and finally the corresponding power abandonment rate and hydrogen production under different numbers of electrolyzers are output. Figure 4 As shown in the figure, if the power generated by new energy in period t is less than the minimum operating power of the electrolyzer and the discharge of the energy storage device still cannot start the electrolyzer, the energy storage device is charged to store this part of the power generated by new energy; otherwise, it is determined whether the power supplied by the new energy power and the energy storage device exceeds the load of the electrolyzer. If it exceeds, the energy storage device is controlled to discharge so that the power generated by new energy and the power supplied by the energy storage device just meet the load demand of the electrolyzer. If it does not exceed, the energy storage device is discharged as much as possible to supply power to the electrolyzer. If the power generated by new energy in period t is between the lower limit of the operating power of the electrolyzer and the load of the electrolyzer and the capacity of the energy storage device has reached the lower limit, the power generated by new energy is supplied to the electrolyzer; otherwise, it is determined whether the power supplied by the new energy power and the energy storage device exceeds the load of the electrolyzer. If it exceeds, the energy storage device is controlled to discharge so that the power generated by new energy and the power supplied by the energy storage device just meet the load demand of the electrolyzer. If it does not exceed, the energy storage device is discharged as much as possible to supply power to the electrolyzer. If the power generated by renewable energy exceeds the load of the electrolyzer during time period t and the capacity of the energy storage device has reached the upper limit, the electrolyzer will be powered by renewable energy power, and the power generated by renewable energy exceeding the load of the electrolyzer will be abandoned; otherwise, it is determined whether the remaining capacity of the energy storage device can charge all the power generated by renewable energy exceeding the load of the electrolyzer. If it can, the energy storage device will charge this part of the power; if not, the energy storage device will charge the power to the upper limit and abandon the remaining power. During the electrolyzer-energy storage coordinated operation process, the abandoned power is counted to determine the abandonment rate corresponding to different numbers of electrolyzers, and then the optimal number of electrolyzers that meet the abandonment rate constraint can be determined. Figure 4 In, P new(t) is the power generated by renewable energy in period t, SOC(t) is the capacity of energy storage equipment in period t, P el,min is the lower limit of electrolytic cell operating power, P el,max is the upper limit of the electrolytic cell operating power, P el (t) is the electrolyzer load during period t (i.e., electrolyzer output power, electric hydrogen production power), P ess (t) is the discharge amount of the energy storage device during period t, P ess (t) is the discharge amount of the energy storage device during period t.

[0068] Step 103: Calculate the amount of hydrogen produced in each period of the production cycle based on the renewable energy power generation, and determine the amount of hydrogen consumed by the synthetic ammonia in each period based on the synthetic ammonia load forecast adjustment strategy.

[0069] The alkaline electrolyzer is the most critical equipment in the hydrogen production system. The working alkaline electrolyzer can be regarded as a nonlinear DC load, and the output voltage model is:

[0070]

[0071] U rev =U r0 -K rev (T el -298.15)

[0072] Where: U rev is the reversible voltage of the electrolytic cell; S el I is the surface area of ​​the electrolytic cell electrode; el is the electrolytic cell current; T el is the working temperature of the electrolytic cell; K el is the electrode overvoltage coefficient; K T is the electrolytic cell overvoltage empirical coefficient; U r0 is the reversible voltage under standard conditions; K rev is the temperature empirical coefficient.

[0073] The relationship between the power of a single electrolyzer and the amount of hydrogen produced is as follows:

[0074] P el,n =U el I el

[0075] Q(t)=0.1977P el,n (t)+96.9987

[0076] Where: P el,n is the output power of a single electrolyzer, and Q(t) is the hydrogen production in time period t.

[0077] Total power of electrolyzer:

[0078] Pel =nP el,n

[0079] Due to the different output powers of electrolyzers, the amount of hydrogen produced under different voltages and output powers is also different. The relationship between the power of a single electrolyzer and the amount of hydrogen produced is as follows: Figure 5 The relationship between electrolyzer power and hydrogen production can be described as:

[0080] 1): When the output power of the electrolyzer preset in this system increases, the hydrogen production also increases linearly.

[0081] 2): For the expected hydrogen production, the output power of the electrolyzer can be set according to the linear relationship, thereby further deriving the required new energy power generation. And vice versa.

[0082] The alkaline water electrolysis hydrogen production cluster system is composed of multiple electrolyzers. Generally, the scale of a single electrolyzer is 5MW, the power adjustment range of a single electrolyzer is [30%, 100%], and the hydrogen production efficiency is 5.0kWh / Nm 3 . When the electrolyzer is operating at low power, due to the characteristics of the internal materials of the electrolyzer, the operating power of the electrolyzer cannot be lower than a certain limit, otherwise there is a risk of hydrogen and oxygen cross-linking exceeding the explosion limit, and the limit is generally 20% to 25% of the rated power of the electrolyzer. At the same time, since the electrolyzer device is an electrical conversion device, its reaction has a certain buffer time, so in practice the electrolyzer can be operated below the hydrogen safety power limit for a short time, and the duration varies from a few minutes depending on the capacity of the electrolyzer.

[0083] In addition, according to the actual ammonia synthesis process, the ammonia synthesis equipment allows the ammonia synthesis load to be adjusted once every 24 hours, and the load remains unchanged within 24 hours. The process of determining the amount of hydrogen consumed by ammonia synthesis in each period based on the ammonia synthesis load prediction adjustment strategy is as follows: Figure 6 As shown, the new energy power generation power and energy storage equipment charging and discharging power every 24 hours are used as inputs to determine the size of the hydrogen supply power in each period of 24 hours, and the hydrogen supply power is summed up, and then the average hydrogen consumption in each period (that is, the amount of hydrogen consumed by synthetic ammonia) and the average synthetic ammonia load are calculated, and the average synthetic ammonia load in each period is determined as the amount of ammonia synthesized in each period.

[0084] Step 104: Based on the amount of hydrogen produced in each time period and the amount of hydrogen consumed for synthesizing ammonia, simulate the operation of the wind-solar hydrogen production and ammonia synthesis system to determine the optimal number of gas storage tanks.

[0085] In this application, the planning strategy cycle is 8760 hours a year, and the operation of the wind-solar hydrogen production and ammonia synthesis system is simulated. The above-predicted hydrogen production and consumption are input in each period of the simulated operation to obtain the optimal number of gas storage tanks.

[0086] In the present application, the renewable energy power generation of the wind-solar hydrogen production and ammonia synthesis system is determined, and the maximum number of electrolyzers with a wind-solar hydrogen production and ammonia synthesis system abandonment rate of 0 is calculated based on the renewable energy power generation. Then, in the process of simulating the operation of the wind-solar hydrogen production and ammonia synthesis system based on the electrolyzer-energy storage coordinated operation strategy, the number of electrolyzers is reduced on the basis of the maximum number of electrolyzers to determine the optimal number of electrolyzers that meets the abandonment rate constraint. At the same time, the amount of hydrogen prepared in each time period during the production cycle is calculated based on the renewable energy power generation, and the amount of hydrogen consumed by ammonia synthesis in each time period is determined based on the ammonia synthesis load prediction adjustment strategy. Then, based on the amount of hydrogen prepared in each time period and the amount of hydrogen consumed by ammonia synthesis, the operation of the wind-solar hydrogen production and ammonia synthesis system is simulated to determine the optimal number of gas storage tanks. Therefore, the optimal number of electrolyzers is determined by simulating the operation system through the electrolyzer-energy storage coordinated operation strategy. At the same time, the wind-solar hydrogen production and ammonia synthesis system is simulated on the basis of determining the amount of hydrogen consumed by ammonia synthesis based on the ammonia load forecast adjustment strategy to determine the optimal number of gas storage tanks, achieve power balance and hydrogen-nitrogen raw gas production and sales balance, thereby reducing the cost of the wind-solar hydrogen production and ammonia synthesis system while ensuring the efficient operation of the system.

[0087] In the present application, after configuring the off-grid wind-solar hydrogen production and ammonia synthesis system through the off-grid wind-solar hydrogen production and ammonia synthesis system capacity configuration method shown in any embodiment of the present application, the actual amount of hydrogen consumed in each time period can be determined, and the operation of the configured off-grid wind-solar hydrogen production and ammonia synthesis system can be simulated based on the actual amount of hydrogen consumed in each time period to predict the amount of ammonia synthesized during the production cycle.

[0088] It should be further explained that, further, the synthetic ammonia station mainly adopts the Haber-Bosch synthesis technology to synthesize liquid ammonia with hydrogen and nitrogen as raw materials. Among them, hydrogen comes from the water electrolysis hydrogen production station, and nitrogen comes from the air separation station. In the process flow of the synthetic ammonia station, the main power-consuming equipment includes compressors, pumps and other power equipment. Due to the limitations of chemical safety and economy, the operating conditions of the synthetic ammonia station have a certain quasi-steady-state operating condition adjustment capability. In order to cope with the raw material fluctuations of hydrogen produced by the water electrolysis hydrogen production station and nitrogen produced by the air separation station, the synthetic ammonia station maintains production stability by adjusting the quasi-steady-state conditions.

[0089] To maintain a certain ammonia yield in the synthetic ammonia section, a constant hydrogen consumption must be maintained, which is subject to constraints such as thermodynamic balance and catalyst activity. The synthetic ammonia yield should be maintained within a given range. The annual hourly ammonia yield is:

[0090]

[0091] Where: F NH3 is the production of synthetic ammonia; are the upper and lower limits of synthetic ammonia production, respectively; is the ramp rate of synthetic ammonia production; They are the upper and lower limits of the ramp rate of synthetic ammonia production respectively; is the hydrogen production; C h2ma is the conversion rate of hydrogen to synthetic ammonia.

[0092] In the wind-solar hydrogen-ammonia system, hydrogen and nitrogen are buffered by gas tanks. When the power of renewable energy generation is large and the ability of energy storage equipment to absorb renewable energy power is limited, the operating power of the water electrolysis hydrogen production station is increased, thereby increasing the production load of hydrogen. Excess hydrogen is stored in gas tanks for later use, so the process flow mainly considers the buffering effect of hydrogen tanks on synthesis gas.

[0093]

[0094] Where: n s is the amount of hydrogen in the gas tank; C hs,max , C hs,min They are the upper and lower limits of the gas tank capacity respectively.

[0095] In view of the volatility of renewable energy generation, energy storage devices are added to off-grid electric hydrogen and ammonia systems.

[0096]

[0097] Where: E ess (t) is the battery capacity during period t; P ess is the charge and discharge power; η cha , η dis are the battery charging and discharging efficiency respectively.

[0098] In addition, during the operation of the off-grid wind-solar hydrogen-to-ammonia system, the following constraints can also be established:

[0099] 1. Power balance constraints

[0100] In order to ensure the safe operation of the system, the system output and load are required to be balanced within the operation scheduling time, and the power abandonment loss is considered. The power balance constraint at time t can be expressed as follows:

[0101]

[0102] Where: P new is the wind power and photovoltaic power; P loss is the abandoned power; C w , C s are the installed capacity of wind power generation and photovoltaic power generation respectively; P wt，nis the power generation of a single wind turbine; P pv，n The power generated by a single photovoltaic machine.

[0103] 2. Electrolyzer operation constraints

[0104] The operating power of the alkaline electrolyzer is guaranteed to be within the operating range, as shown in the following formula:

[0105] P el,min ≤P el,n (t)≤P el,max

[0106] Where: P el,max , P el,min The upper and lower limits of the electrolytic cell operating power.

[0107] 3. Electrolyzer operation constraints

[0108] Ensure that the SOC (ratio of current battery storage capacity to rated storage capacity) of the energy storage device is within the allowable capacity range:

[0109]

[0110] Where: P cha is the charging power; P dis is the discharge power.

[0111] 4. Power curtailment rate constraints

[0112] In order to ensure the utilization rate of renewable energy power generation, the system is not allowed to abandon wind and solar power in large quantities, as shown in the following formula:

[0113]

[0114] Optionally, in order to comprehensively consider the economic efficiency and resource utilization efficiency of the wind-solar hydrogen production and ammonia synthesis system, the number of alkaline electrolyzers and gas storage tanks is taken as the optimization object of capacity configuration, and the minimum total system cost is taken as the objective function of capacity configuration, as shown in the following formula:

[0115] minC=C pv +C wt +C H +C HS +C NH3 +C BAT +C ss

[0116] Where: C is the total system cost; C pv is the photovoltaic cost; C wt is the cost of wind power; C H is the cost of hydrogen production; C HS is the cost of hydrogen storage tank; C NH3 is the cost of synthetic ammonia; C BAT is the energy storage cost; Css Invest costs in personnel.

[0117] The costs of photovoltaics, wind power, hydrogen production systems, hydrogen storage tanks, synthetic ammonia systems, energy storage equipment, etc. all include three parts: investment cost, operation and maintenance cost, and depreciation cost. The personnel input cost is based on the salary compensation given to personnel after producing each ton of synthetic ammonia, which is related to the output of synthetic ammonia.

[0118] In order to realize the above-mentioned embodiments, the present disclosure also proposes a capacity configuration device for an off-grid wind-solar hydrogen production and ammonia synthesis system.

[0119] Figure 7 This is a structural block diagram of the capacity configuration device of the off-grid wind-solar hydrogen production and ammonia synthesis system provided in the second embodiment of the present disclosure.

[0120] like Figure 7 As shown, the off-grid wind-solar hydrogen production and ammonia synthesis system capacity configuration device 700 may include:

[0121] The first determination module 710 is used to determine the renewable energy power generation of the wind-solar hydrogen production and ammonia synthesis system, so as to calculate the maximum number of electrolyzers with a power abandonment rate of 0 for the wind-solar hydrogen production and ammonia synthesis system based on the renewable energy power generation;

[0122] The first simulation operation module 720 is used to reduce the number of electrolyzers based on the maximum number of electrolyzers during the simulation operation of the wind-solar hydrogen production and ammonia synthesis system based on the electrolyzer-energy storage coordinated operation strategy, and determine the optimal number of electrolyzers that meets the power abandonment rate constraint;

[0123] The second determination module 730 is used to calculate the amount of hydrogen produced in each period of the production cycle according to the amount of electricity generated by the new energy, and determine the amount of hydrogen consumed by the synthesis of ammonia in each period based on the synthetic ammonia load prediction adjustment strategy;

[0124] The second simulation operation module 740 is used to simulate the operation of the wind-solar hydrogen production and ammonia synthesis system to determine the optimal number of gas storage tanks based on the amount of hydrogen prepared in each time period and the amount of hydrogen consumed for synthesizing ammonia.

[0125] Optionally, the electrolyzer-energy storage coordinated operation strategy includes:

[0126] The electrolyzer is started by comparing the renewable energy power generation in each period with the rated power of the electrolyzer, and the energy storage charging and discharging is determined based on the status of the energy storage device.

[0127] Optionally, also include:

[0128] The prediction module is used to determine the actual amount of hydrogen consumed in each time period when the wind-solar hydrogen production and ammonia synthesis system is running after capacity configuration is completed, so as to predict the amount of ammonia synthesized within the production cycle based on the actual amount of hydrogen consumed in each time period.

[0129] Optionally, the first determining module is used to:

[0130] In the process of simulating the operation of the wind-solar hydrogen production and ammonia synthesis system based on the electrolyzer-energy storage coordinated operation strategy, the charging and discharging actions of the energy storage equipment and the electrolyzer power are judged according to the new energy power generation power and the capacity status of the energy storage equipment, and the number of electrolyzers finally started is determined as the maximum number of electrolyzers with a power abandonment rate of 0 for the wind-solar hydrogen production and ammonia synthesis system.

[0131] In the present application, the renewable energy power generation of the wind-solar hydrogen production and ammonia synthesis system is determined, and the maximum number of electrolyzers with a wind-solar hydrogen production and ammonia synthesis system abandonment rate of 0 is calculated based on the renewable energy power generation. Then, in the process of simulating the operation of the wind-solar hydrogen production and ammonia synthesis system based on the electrolyzer-energy storage coordinated operation strategy, the number of electrolyzers is reduced on the basis of the maximum number of electrolyzers to determine the optimal number of electrolyzers that meets the abandonment rate constraint. At the same time, the amount of hydrogen prepared in each time period during the production cycle is calculated based on the renewable energy power generation, and the amount of hydrogen consumed by ammonia synthesis in each time period is determined based on the ammonia synthesis load prediction adjustment strategy. Then, based on the amount of hydrogen prepared in each time period and the amount of hydrogen consumed by ammonia synthesis, the operation of the wind-solar hydrogen production and ammonia synthesis system is simulated to determine the optimal number of gas storage tanks. Therefore, the optimal number of electrolyzers is determined by simulating the operation system through the electrolyzer-energy storage coordinated operation strategy. At the same time, the wind-solar hydrogen production and ammonia synthesis system is simulated on the basis of determining the amount of hydrogen consumed by ammonia synthesis based on the ammonia load forecast adjustment strategy to determine the optimal number of gas storage tanks, achieve power balance and hydrogen-nitrogen raw gas production and sales balance, thereby reducing the cost of the wind-solar hydrogen production and ammonia synthesis system while ensuring the efficient operation of the system.

[0132] In order to implement the above embodiments, the present disclosure also proposes a computer device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the capacity configuration method of the off-grid wind-solar hydrogen production and ammonia synthesis system proposed in the above embodiments of the present disclosure is implemented.

[0133] In order to implement the above embodiments, the present disclosure also proposes a non-temporary computer-readable storage medium storing a computer program. When the computer program is executed by a processor, it implements the capacity configuration method of the off-grid wind-solar hydrogen production and ammonia synthesis system proposed in the above embodiments of the present disclosure.

[0134] In order to implement the above embodiments, the present disclosure also proposes a computer program product. When the instruction processor in the computer program product is executed, the capacity configuration method of the off-grid wind-solar hydrogen production and ammonia synthesis system proposed in the above embodiments of the present disclosure is executed.

[0135] Figure 8 A block diagram of an exemplary computer device suitable for implementing embodiments of the present disclosure is shown. Figure 8The computer device 12 shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present disclosure.

[0136] like Figure 5 As shown, the computer device 12 is in the form of a general-purpose computing device. The components of the computer device 12 may include, but are not limited to: one or more processors or processing units 16, a system memory 28, and a bus 18 that connects various system components (including the system memory 28 and the processing unit 16).

[0137] The bus 18 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, a graphics acceleration port, a processor or a local bus using any of a variety of bus structures. For example, these architectures include but are not limited to Industry Standard Architecture (ISA) bus, Micro Channel Architecture (MAC) bus, Enhanced ISA bus, Video Electronics Standards Association (VESA) local bus and Peripheral Component Interconnection (PCI) bus.

[0138] The computer device 12 typically includes a variety of computer system readable media. These media can be any available media that can be accessed by the computer device 12, including volatile and non-volatile media, removable and non-removable media.

[0139] The memory 28 may include computer system readable media in the form of volatile memory, such as random access memory (RAM) 30 and / or cache memory 32. The computer device 12 may further include other removable / non-removable, volatile / non-volatile computer system storage media. By way of example only, the storage system 34 may be used to read and write non-removable, non-volatile magnetic media ( Figure 8 not shown, usually called a "hard drive"). Although Figure 8Not shown in the figure, a disk drive for reading and writing a removable non-volatile disk (e.g., a "floppy disk"), and an optical disk drive for reading and writing a removable non-volatile optical disk (e.g., a compact disc read-only memory (CD-ROM), a digital versatile disc read-only memory (DVD-ROM), or other optical media) may be provided. In these cases, each drive may be connected to the bus 18 via one or more data medium interfaces. The memory 28 may include at least one program product having a set (e.g., at least one) of program modules configured to perform the functions of the various embodiments of the present disclosure.

[0140] A program / utility 40 having a set (at least one) of program modules 42 may be stored, for example, in the memory 28, such program modules 42 including but not limited to an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment. The program modules 42 generally perform the functions and / or methods of the embodiments described in the present disclosure.

[0141] The computer device 12 may also communicate with one or more external devices 14 (e.g., keyboard, pointing device, display 24, etc.), one or more devices that enable a user to interact with the computer device 12, and / or any device that enables the computer device 12 to communicate with one or more other computing devices (e.g., network card, modem, etc.). Such communication may be performed via an input / output (I / O) interface 22. In addition, the computer device 12 may also communicate with one or more networks (e.g., a local area network (LAN), a wide area network (WAN), and / or a public network, such as the Internet) via a network adapter 20. As shown, the network adapter 20 communicates with other modules of the computer device 12 via a bus 18. It should be understood that, although not shown in the figure, other hardware and / or software modules may be used in conjunction with the computer device 12, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0142] The processing unit 16 executes various functional applications and data processing by running programs stored in the system memory 28, such as implementing the methods mentioned in the above embodiments.

[0143] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0144] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present disclosure, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0145] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present disclosure includes additional implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present disclosure belong.

[0146] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute the instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0147] It should be understood that the various parts of the present disclosure can be implemented in hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used to implement: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0148] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0149] In addition, each functional unit in each embodiment of the present disclosure may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0150] The storage medium mentioned above may be a read-only memory, a disk or an optical disk, etc. Although the embodiments of the present disclosure have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present disclosure. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present disclosure.

Claims

1. A capacity configuration method for an off-grid wind-solar hydrogen production and ammonia synthesis system, characterized in that: include: Determine the renewable energy power generation of the wind-solar hydrogen production and ammonia synthesis system, and calculate the maximum number of electrolyzers with a power abandonment rate of 0 for the wind-solar hydrogen production and ammonia synthesis system based on the renewable energy power generation; In the process of simulating the operation of the wind-solar hydrogen production and ammonia synthesis system based on the electrolyzer-energy storage coordinated operation strategy, the number of electrolyzers is reduced on the basis of the maximum number of electrolyzers to determine the optimal number of electrolyzers that meets the power abandonment rate constraint; Calculate the amount of hydrogen produced in each period of the production cycle based on the amount of electricity generated by renewable energy, and determine the amount of hydrogen consumed by ammonia synthesis in each period based on the synthetic ammonia load forecast adjustment strategy; Based on the amount of hydrogen prepared in each time period and the amount of hydrogen consumed for synthesizing ammonia, the wind-solar hydrogen production and ammonia synthesis system is simulated and operated to determine the optimal number of gas storage tanks.

2. The method according to claim 1, characterized in that The electrolyzer-energy storage coordinated operation strategy includes: The electrolyzer is started by comparing the renewable energy power generation in each period with the rated power of the electrolyzer, and the energy storage charging and discharging is determined based on the status of the energy storage device.

3. The method according to claim 1, characterized in that Also includes: When the wind-solar hydrogen production and ammonia synthesis system is running after capacity configuration is completed, the actual amount of hydrogen consumed in each time period is determined to predict the amount of ammonia synthesized within the production cycle based on the actual amount of hydrogen consumed in each time period.

4. The method according to claim 1, characterized in that The maximum number of electrolyzers for calculating the wind-solar hydrogen production and ammonia synthesis system with a power abandonment rate of 0 based on the renewable energy power generation includes: In the process of simulating the operation of the wind-solar hydrogen production and ammonia synthesis system based on the electrolyzer-energy storage coordinated operation strategy, the charging and discharging actions of the energy storage equipment and the electrolyzer power are judged according to the new energy power generation power and the capacity status of the energy storage equipment, and the number of electrolyzers finally started is determined as the maximum number of electrolyzers with a power abandonment rate of 0 for the wind-solar hydrogen production and ammonia synthesis system.

5. An off-grid wind-solar hydrogen production and ammonia synthesis system capacity configuration device, characterized in that: include: The first determination module is used to determine the renewable energy power generation of the wind-solar hydrogen production and ammonia synthesis system, so as to calculate the maximum number of electrolyzers with a power abandonment rate of 0 for the wind-solar hydrogen production and ammonia synthesis system based on the renewable energy power generation; The first simulation operation module is used to simulate the operation of the wind-solar hydrogen production and ammonia synthesis system based on the electrolyzer-energy storage coordinated operation strategy, reduce the number of electrolyzers on the basis of the maximum number of electrolyzers, and determine the optimal number of electrolyzers that meets the power abandonment rate constraint; The second determination module is used to calculate the amount of hydrogen produced in each period of the production cycle according to the power generation of new energy, and determine the amount of hydrogen consumed by the synthesis of ammonia in each period based on the synthetic ammonia load prediction adjustment strategy; The second simulation operation module is used to simulate the operation of the wind-solar hydrogen production and ammonia synthesis system to determine the optimal number of gas storage tanks based on the amount of hydrogen prepared in each time period and the amount of hydrogen consumed for synthesizing ammonia.

6. The device according to claim 5, characterized in that The electrolyzer-energy storage coordinated operation strategy includes: The electrolyzer is started by comparing the renewable energy power generation in each period with the rated power of the electrolyzer, and the energy storage charging and discharging is determined based on the status of the energy storage device.

7. The device according to claim 5, characterized in that Also includes: The prediction module is used to determine the actual amount of hydrogen consumed in each time period when the wind-solar hydrogen production and ammonia synthesis system is running after capacity configuration is completed, so as to predict the amount of ammonia synthesized within the production cycle based on the actual amount of hydrogen consumed in each time period.

8. The device according to claim 5, characterized in that The first determining module is used to: In the process of simulating the operation of the wind-solar hydrogen production and ammonia synthesis system based on the electrolyzer-energy storage coordinated operation strategy, the charging and discharging actions of the energy storage equipment and the electrolyzer power are judged according to the new energy power generation power and the capacity status of the energy storage equipment, and the number of electrolyzers finally started is determined as the maximum number of electrolyzers with a power abandonment rate of 0 for the wind-solar hydrogen production and ammonia synthesis system.

9. An electronic device, characterized in that: include: A processor, and a memory communicatively connected to the processor; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory to implement the method according to any one of claims 1 to 4.

10. A computer program product, characterized in that The invention comprises a computer program, which implements the method according to any one of claims 1 to 4 when being executed by a processor.

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