Energy storage capacity configuration method and system for off-grid renewable energy hydrogen production system

Abstract

The present application relates to the technical field of power system planning, and discloses a renewable energy off-grid hydrogen production system energy storage capacity configuration method and system, the energy storage capacity configuration includes: energy storage rated capacity configuration and determination of energy storage maximum charge and discharge power, the method comprises the following steps: obtaining the total power required for basic operation of the off-grid hydrogen production system, preset basic operation requirement duration, and determining the energy storage rated capacity of the energy storage unit according to the total power, the preset basic operation requirement duration, and the preset energy storage capacity configuration requirement; obtaining the lower limit of the operation power of the hydrogen production unit, and obtaining the energy storage maximum charge and discharge power according to the total power and the lower limit of the operation power of the hydrogen production unit. The renewable energy off-grid hydrogen production system energy storage capacity configuration method provided by the present application reduces the energy storage capacity calculation complexity through the collection and analysis of various data of the off-grid hydrogen production system, enhances the decision explanation, and improves the universality of the energy storage capacity configuration method.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power system planning, in particular to an energy storage capacity configuration method and system for a renewable energy off-grid hydrogen production system. BACKGROUND

[0002] In the current energy transition and sustainable development process, off-grid renewable energy hydrogen production systems have received widespread attention due to their potential in improving energy self-sufficiency, reducing greenhouse gas emissions, and promoting energy independence in areas far from the power grid. Energy storage capacity configuration plays a crucial role in off-grid renewable energy hydrogen production systems, as it directly affects the stability of energy supply, economic efficiency, and environmental impact. Reasonable energy storage capacity configuration can ensure that the system can meet the system demand when renewable energy output is unstable, while optimizing system investment and operating costs.

[0003] Existing technologies mainly focus on developing algorithms and decision support systems, involving algorithms such as genetic algorithms, machine learning techniques, but these methods have disadvantages such as high computational complexity of genetic algorithms, difficulty in parameter adjustment, poor reproducibility of results, strong dependence of machine learning on data, difficulty in obtaining high-quality and representative data in energy storage capacity configuration problems, limiting the accuracy and generalization ability of the model, poor model interpretability, difficult decision-making process, and poor universality. SUMMARY

[0004] Therefore, the present application provides an energy storage capacity configuration method and system for a renewable energy off-grid hydrogen production system to solve the problem of how to reasonably configure the energy storage capacity of an off-grid hydrogen production system.

[0005] In a first aspect, the present application provides an energy storage capacity configuration method for a renewable energy off-grid hydrogen production system, the off-grid hydrogen production system comprising an energy storage unit and a hydrogen production unit, the energy storage capacity configuration comprising configuration of an energy storage rated capacity and determination of an energy storage maximum charge and discharge power, the method comprising:

[0006] obtaining a total power required for basic operation of the off-grid hydrogen production system and a preset basic operation demand duration, and determining the energy storage rated capacity of the energy storage unit according to the total power and the preset basic operation demand duration and a preset energy storage capacity configuration requirement;

[0007] obtaining a lower limit of the operating power of the hydrogen production unit, and obtaining the energy storage maximum charge and discharge power according to the total power and the lower limit of the operating power of the hydrogen production unit.

[0008] The energy storage capacity configuration method for a renewable energy off-grid hydrogen production system provided by the present application reduces the complexity of energy storage capacity calculation by collecting and analyzing various data of the off-grid hydrogen production system, enhances the interpretability of the decision-making, and improves the universality of the energy storage capacity configuration method.

[0009] In one optional implementation, the preset basic operation requirement duration includes: preset basic operation maintenance duration and preset system restart duration;

[0010] Based on the total power and the preset basic operating time requirements, the rated energy storage capacity is determined according to the preset energy storage capacity configuration requirements, including:

[0011] The basic operation and maintenance capacity of the energy storage unit is determined based on the total power and the preset basic operation and maintenance duration.

[0012] The restart capacity of the energy storage unit is determined based on the total power and the preset system restart time.

[0013] The rated capacity of energy storage is determined based on the basic operating capacity, restart capacity, and the preset capacity ratio of energy storage units.

[0014] The energy storage capacity configuration method for the off-grid hydrogen production system of renewable energy provided by the present invention determines the capacity required for basic operation and the capacity required for restart based on the basic operation maintenance time and the preset system restart time, respectively. Considering that the state of charge of the energy storage unit should not be overcharged or over-discharged, the rated energy storage capacity is obtained by combining the preset capacity ratio, so as to ensure that the rated energy storage capacity can meet the basic operation maintenance without excessive redundancy, thus achieving energy storage balance.

[0015] In one optional implementation, the off-grid hydrogen production system further includes: a power generation unit and a plant auxiliary power unit, with a total power output including:

[0016] The first power is used to maintain the basic operation of the energy storage unit. The magnitude of the first power is determined by multiplying the rated capacity of the energy storage unit by the preset power ratio.

[0017] The second power source is used to maintain the basic operation of the power generation unit;

[0018] The third power source is used to maintain the basic operation of the hydrogen production unit.

[0019] The fourth power source is used to maintain the basic operation of the plant's power supply unit.

[0020] The energy storage capacity configuration method for the off-grid hydrogen production system provided by this invention includes the basic operating power of the four units that make up the off-grid hydrogen production system, which is required to maintain basic operation. The method for collecting the power of each unit and calculating the total power is simple and highly interpretable.

[0021] In one optional implementation, the basic operation maintenance capacity of the energy storage unit is determined based on the total power and a preset basic operation maintenance duration, including:

[0022] Multiply the total power by the preset basic operating duration to obtain the basic capacity.

[0023] The capacity amplification factor is determined based on the losses of the off-grid hydrogen production system.

[0024] The basic operational maintenance capacity of the energy storage unit is determined based on the maintenance capacity and the capacity expansion factor.

[0025] In one optional implementation, the restart capacity of the energy storage unit is determined based on the total power and a preset system restart duration, including:

[0026] Multiply the total power by the preset system restart time to obtain the basic restart capacity;

[0027] The restart capacity of the energy storage unit is determined based on the basic restart capacity and the capacity amplification factor.

[0028] The energy storage capacity configuration method for the off-grid hydrogen production system of renewable energy provided by this invention requires consideration of losses such as line and transformer losses when calculating the basic operation maintenance capacity and restart capacity, determining the capacity amplification factor, and then adding appropriate redundancy to the basic operation maintenance capacity and restart capacity according to the capacity amplification factor to ensure the normal operation of the basic operation and restart process.

[0029] In one optional implementation, the rated energy storage capacity is determined based on the basic operating capacity, restart capacity, and a preset capacity ratio of the energy storage units, including:

[0030] The basic operating capacity is added to the restart capacity to obtain the energy storage capacity;

[0031] Divide the energy storage capacity by the preset capacity ratio to obtain the rated energy storage capacity.

[0032] The energy storage capacity configuration method for an off-grid hydrogen production system provided by this invention considers the capacity required to maintain basic operation, the capacity required for restarting, and the state of charge of the energy storage unit during the configuration process, ensuring that the energy storage unit operates in a normal state, avoiding overcharging or over-discharging of the energy storage unit, and ensuring the stable operation of the energy storage unit.

[0033] In one optional implementation, the maximum charge / discharge power of the energy storage is obtained based on the total power and the lower limit of the operating power of the hydrogen production unit, including:

[0034] Calculate the sum of the total power and the lower limit of the operating power of the hydrogen production unit;

[0035] The power amplification factor is determined based on the losses of the off-grid hydrogen production system.

[0036] Multiplying the power by the power amplification factor yields the maximum charge and discharge power of the energy storage.

[0037] The present invention provides a method for configuring the energy storage capacity of an off-grid hydrogen production system for renewable energy. The power sum is determined based on the total power and the lower limit of the operating power of the hydrogen production unit, and the power amplification factor is determined in combination with the line loss. This method then obtains the maximum charging and discharging power of the energy storage unit, ensuring that the off-grid hydrogen production system can maintain stable operation for a certain period of time when renewable energy power generation is unstable.

[0038] Secondly, this invention provides an energy storage capacity configuration system for an off-grid hydrogen production system for renewable energy. The off-grid hydrogen production system includes an energy storage unit and a hydrogen production unit. The energy storage capacity configuration includes: configuring the rated capacity of the energy storage and determining the maximum charge and discharge power of the energy storage. The system includes:

[0039] The rated capacity configuration module for energy storage is used to obtain the total power required for the basic operation of the off-grid hydrogen production system and the preset basic operation requirement duration, and to determine the rated capacity of the energy storage unit according to the preset energy storage capacity configuration requirements based on the total power and the preset basic operation requirement duration.

[0040] The maximum power determination module is used to obtain the lower limit of the operating power of the hydrogen production unit, and to obtain the maximum charge and discharge power of the energy storage based on the total power and the lower limit of the operating power of the hydrogen production unit.

[0041] Thirdly, the present invention provides a computer device, comprising: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the computer instructions to perform the method described in the first aspect or any corresponding embodiment thereof.

[0042] Fourthly, the present invention provides a computer-readable storage medium storing computer instructions for causing a computer to perform the method described in the first aspect or any corresponding embodiment thereof. Attached Figure Description

[0043] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0044] Figure 1 This is a schematic diagram of an off-grid hydrogen production system according to an embodiment of the present invention;

[0045] Figure 2 This is a flowchart illustrating the energy storage capacity configuration method for an off-grid hydrogen production system based on an embodiment of the present invention.

[0046] Figure 3 This is a flowchart illustrating another method for configuring the energy storage capacity of an off-grid hydrogen production system for renewable energy according to an embodiment of the present invention;

[0047] Figure 4 This is a structural block diagram of the energy storage capacity configuration system of the off-grid hydrogen production system for renewable energy according to an embodiment of the present invention;

[0048] Figure 5 This is a schematic diagram of the hardware structure of a computer device according to an embodiment of the present invention. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0050] This invention provides a method for configuring the energy storage capacity of an off-grid hydrogen production system based on renewable energy sources. By collecting and analyzing various data from the off-grid hydrogen production system, the method aims to reduce the complexity of energy storage capacity calculation and improve its accuracy.

[0051] According to an embodiment of the present invention, an embodiment of a method for configuring the energy storage capacity of an off-grid hydrogen production system for renewable energy is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0052] This embodiment provides a method for configuring the energy storage capacity of an off-grid hydrogen production system based on renewable energy, which can be used in the aforementioned computer system, such as... Figure 1 As shown, the off-grid hydrogen production system includes an energy storage unit, a hydrogen production unit, a power generation unit, and a plant power supply unit. These units are interconnected via an AC bus. The energy storage capacity configuration includes: configuring the rated energy storage capacity and determining the maximum charge / discharge power of the energy storage. Figure 2 This is a flowchart of a method for configuring the energy storage capacity of an off-grid hydrogen production system based on an embodiment of the present invention, as shown below. Figure 2 As shown, the process includes the following steps:

[0053] Step S101: Obtain the total power required for the basic operation of the off-grid hydrogen production system and the preset basic operation duration, and determine the rated energy storage capacity of the energy storage unit according to the preset energy storage capacity configuration requirements based on the total power and the preset basic operation duration.

[0054] Specifically, the off-grid hydrogen production system comprises multiple units, each with a minimum basic operating power to maintain basic operation. The basic operating power of each unit is obtained, and the sum of the basic operating powers of all units is calculated as the total power. The preset basic operation maintenance duration can be the required time for the entire process from system startup to preheating completion. The duration can be adjusted according to actual conditions; this is just an example and is not a limitation.

[0055] Step S102: Obtain the lower limit of the operating power of the hydrogen production unit, and obtain the maximum charge and discharge power of the energy storage based on the total power and the lower limit of the operating power of the hydrogen production unit.

[0056] Specifically, the maximum charge and discharge power of the energy storage unit needs to match the rated power of a single electrolyzer in the hydrogen production unit to ensure that the energy storage unit has the ability to support the operation of a single electrolyzer at its rated power for short periods. The hydrogen production unit includes multiple hydrogen production devices (such as electrolyzers), and its lower limit of operating power includes the rated power of a single electrolyzer, the power of the matching gas-liquid separation frame, purification device, and auxiliary equipment such as hydrogen compressors.

[0057] The energy storage capacity configuration method for off-grid hydrogen production systems provided in this embodiment reduces the computational complexity of energy storage capacity by collecting and analyzing various data from the off-grid hydrogen production system, enhances the interpretability of decisions, and improves the versatility of the energy storage capacity configuration method.

[0058] This embodiment provides a method for configuring the energy storage capacity of an off-grid hydrogen production system based on renewable energy, which can be used in the aforementioned computer system. Figure 3 This is a flowchart of a method for configuring the energy storage capacity of an off-grid hydrogen production system based on an embodiment of the present invention, as shown below. Figure 3 As shown, the process includes the following steps:

[0059] Step S201: Obtain the total power required for the basic operation of the off-grid hydrogen production system and the preset basic operation duration, and determine the rated energy storage capacity of the energy storage unit according to the preset energy storage capacity configuration requirements based on the total power and the preset basic operation duration.

[0060] Specifically, the preset basic operation requirement duration includes: preset basic operation maintenance duration and preset system restart duration. Step S201 above includes:

[0061] Step S2011: Determine the basic operation maintenance capacity of the energy storage unit based on the total power and the preset basic operation maintenance duration.

[0062] In some optional implementations, step S2011 above includes:

[0063] Step a1: Multiply the total power by the preset basic operation duration to obtain the basic maintenance capacity.

[0064] Specifically, the duration for which the off-grid hydrogen production system maintains basic operation is set according to the actual situation. The total power for maintaining basic operation is multiplied by the preset duration for maintaining basic operation to obtain the basic capacity for maintaining basic operation, which is equivalent to the required basic capacity for maintaining basic operation when the off-grid hydrogen production system operates at total power for the preset duration for maintaining basic operation.

[0065] Step a2: Determine the capacity amplification factor based on the losses of the off-grid hydrogen production system.

[0066] Specifically, during system operation, energy conversion is not 100% complete; there will be basic energy losses due to lines, transformers, etc. Therefore, it is necessary to add appropriate redundancy on the basis of maintaining the basic capacity, and determine the capacity amplification factor based on the actual losses.

[0067] Step a3: Determine the basic operating maintenance capacity of the energy storage unit based on the basic maintenance capacity and the capacity amplification factor.

[0068] Specifically, the basic operating capacity is amplified by the capacity amplification factor determined by the actual losses, and the basic operating capacity is obtained by multiplying the basic operating capacity by the capacity amplification factor.

[0069] Step S2012: Determine the restart capacity of the energy storage unit based on the total power and the preset system restart time.

[0070] In some optional implementations, step S2012 above includes:

[0071] Step b1: Multiply the total power by the preset system restart duration to obtain the basic restart capacity.

[0072] Specifically, the preset system restart duration can be the restart duration of the power generation equipment in the power generation unit, such as the restart duration of a wind turbine. This is just an example and is not a limitation. The energy storage unit needs to maintain basic operation for a certain period of time before the system enters a shutdown state, waiting for the next wind speed to meet the conditions for wind turbine power generation. Therefore, the energy storage unit also needs to meet the capacity required for system restart.

[0073] Step b2: Determine the restart capacity of the energy storage unit based on the basic restart capacity and the capacity amplification factor.

[0074] Specifically, the restart capacity of the energy storage unit is obtained by multiplying the basic restart capacity by the capacity amplification factor.

[0075] The energy storage capacity configuration method for the off-grid hydrogen production system of renewable energy provided in this embodiment needs to consider the losses of lines and transformers when calculating the basic operation maintenance capacity and restart capacity, determine the capacity amplification factor, and then add appropriate redundancy to the basic operation maintenance capacity and restart capacity according to the capacity amplification factor to ensure the normal operation of the basic operation and restart process.

[0076] Step S2013: Determine the rated capacity of energy storage based on the basic operating capacity, restart capacity, and the preset capacity ratio of the energy storage unit.

[0077] In some optional implementations, step S2013 above includes:

[0078] Step c1: Add the basic operating capacity to the restart capacity to obtain the energy storage capacity.

[0079] Step c2: Divide the energy storage capacity by the preset capacity ratio to obtain the rated energy storage capacity.

[0080] Specifically, in this embodiment of the invention, the basic operating capacity is added to the restart capacity to obtain the energy storage capacity required by the energy storage unit to meet the basic operating time of the system and the restart after shutdown. However, since the state of charge (SOC) of the energy storage unit cannot be too low or too high during normal operation, there will be a ratio of the state of charge under normal operation to the rated capacity of the energy storage unit. This ratio is used as the preset capacity ratio. The energy storage capacity is divided by the preset capacity ratio to obtain the rated energy storage capacity.

[0081] The energy storage capacity configuration method for the off-grid hydrogen production system provided in this embodiment considers the capacity required for basic operation, the capacity required for restart, and the state of charge (SBC) of the energy storage units during the configuration process. This ensures that the energy storage units operate in a normal state, avoids overcharging or over-discharging, and guarantees stable operation. The required capacity for basic operation and the required capacity for restart are determined based on the basic operation maintenance duration and the preset system restart duration. Considering that the SBC of the energy storage units should not be overcharged or over-discharged, the rated energy storage capacity is obtained by combining this with a preset capacity ratio. This ensures that the rated energy storage capacity meets the basic operation maintenance needs without excessive redundancy, achieving energy storage balance.

[0082] In some alternative implementations, such as Figure 1 As shown, the off-grid hydrogen production system includes: an energy storage unit, a hydrogen production unit, a power generation unit, and a plant auxiliary power unit, with a total power output including:

[0083] 1. The first power is used to maintain the basic operation of the energy storage unit. It is determined by multiplying the rated capacity of the energy storage unit by a preset power ratio. Specifically, the energy storage unit includes energy storage batteries, energy storage inverters, fire protection systems, and auxiliary equipment such as air conditioning. The first power is the maximum power consumed by the air conditioning system (when meeting the charging and discharging temperature requirements of the energy storage battery) and the fire protection equipment (when meeting safety requirements). This is just an example and not a limitation. The maximum power of the auxiliary equipment is proportional to the rated capacity of the energy storage unit; the first power is obtained by multiplying the rated capacity of the energy storage unit by the preset power ratio. The rated capacity of the energy storage unit used here is an unknown variable.

[0084] 2. Secondary power is used to maintain the basic operation of the power generation unit. Specifically, the power generation unit is a renewable energy power generation unit, including: wind turbines, photovoltaic panels, and supporting converters, etc. The secondary power is the maximum power consumed to maintain the power generation equipment in a hot standby state. When the power generation unit is wind power generation, it is necessary to maintain the wind turbine gearbox oil temperature to meet the starting oil temperature. In this case, the secondary power is mainly the power of the wind turbine gearbox oil temperature heater. This is just an example and is not a limitation.

[0085] 3. The third power is used to maintain the basic operation of the hydrogen production unit. Specifically, the hydrogen production unit includes an electrolyzer, a gas-liquid separation frame, a purification unit, and auxiliary equipment such as a hydrogen compressor. The third power is the maximum power consumed by the air conditioning installed to maintain the temperature of the electrolyzer and the fire-fighting equipment installed to meet safety requirements. This is only an example and is not a limitation.

[0086] 4. The fourth power is used to maintain the basic operation of the plant's auxiliary power units. Specifically, the auxiliary power units mainly include the power supply for the control system, the power supply for fire protection loads, and the power consumption for personnel living in the plant, such as air conditioning and electric auxiliary heaters. The fourth power mainly refers to the maximum power consumed by the power supply for the control system, the power supply for fire protection loads, lighting, and the power consumption for personnel living in the plant, such as air conditioning and electric auxiliary heaters. This is only an example and is not a limitation.

[0087] The capacities of the renewable energy power generation unit, hydrogen production unit, and plant power supply unit have been determined, but the capacity of the energy storage unit needs to be determined based on the operating conditions of each unit. In the off-grid renewable energy hydrogen production system, the power consumed by the hydrogen production unit mainly comes from the real-time renewable energy power generation unit, meaning the load power changes with the power generation. The main role of the energy storage unit is to build the bus voltage, balance the power of the hydrogen production unit and the power generation unit, and when the output of the renewable energy power generation unit is insufficient, the electrolyzer reduces its power until it shuts down completely, and the energy storage unit discharges to maintain the basic operation of the system.

[0088] The energy storage capacity configuration method for the off-grid hydrogen production system provided in this embodiment includes the basic operating power of the four units that make up the off-grid hydrogen production system, and the method for collecting the power of each unit and calculating the total power is simple and highly interpretable.

[0089] Step S202: Obtain the lower limit of the operating power of the hydrogen production unit, and obtain the maximum charge and discharge power of the energy storage based on the total power and the lower limit of the operating power of the hydrogen production unit.

[0090] Specifically, step S202 includes:

[0091] Step S2021: Calculate the sum of the total power and the lower limit of the operating power of the hydrogen production unit.

[0092] Specifically, the lower limit of the operating power of a hydrogen production unit is the minimum power required for the unit to maintain hydrogen production. Generally, the power required for a single electrolyzer to operate at its rated power is used as the lower limit of the operating power of the hydrogen production unit. This mainly includes the rated power of the single electrolyzer, as well as the power of the associated gas-liquid separation frame, purification unit, and auxiliary equipment such as the hydrogen compressor. The total power is then added to the lower limit of the operating power of the hydrogen production unit to obtain the total power.

[0093] Step S2022: Determine the power amplification factor based on the losses of the off-grid hydrogen production system.

[0094] Specifically, after meeting the total power requirements for basic system operation and the lower limit of the operating power requirements of the hydrogen production unit, it is also necessary to consider the losses of lines and transformers, and to add appropriate redundancy. The power amplification factor is determined based on the actual losses, and usually the power amplification factor is the same as the capacity amplification factor.

[0095] Step S2023: Multiply the power by the power amplification factor to obtain the maximum charge and discharge power of the energy storage.

[0096] The energy storage capacity configuration method for the off-grid hydrogen production system provided in this embodiment determines the power sum based on the total power and the lower limit of the operating power of the hydrogen production unit, and then determines the power amplification factor in combination with line losses, thereby obtaining the maximum charging and discharging power of the energy storage unit. This ensures that when renewable energy power generation is unstable, the charging and discharging of the energy storage unit can maintain the stable operation of the off-grid hydrogen production system for a certain period of time.

[0097] In one specific embodiment, the renewable energy power generation unit mainly includes five 5MW wind turbines; the hydrogen production unit mainly includes three 1000Nm3 / h electrolyzers, three gas-liquid separation frames, two purification devices, and three hydrogen compressors and other auxiliary equipment; the energy storage unit mainly includes lithium iron phosphate batteries, energy storage converters, fire protection and air conditioning and other auxiliary equipment; and the plant power supply unit mainly includes the power supply for the control system, the power supply for the fire protection load, and the power supply for the station personnel's living quarters, such as air conditioning and electric auxiliary heaters.

[0098] The process for configuring the rated capacity of energy storage is as follows:

[0099] (1-1) Based on the preset power ratio between the rated power of the fire protection and air conditioning equipment in the energy storage unit and the rated capacity of the energy storage unit, the first power required by the energy storage unit to maintain basic operation is obtained. The formula for calculating the first power is as follows:

[0100] P1 = 0.02 × B rated

[0101] Where P1 represents the first power, Brated represents the rated capacity of the energy storage unit, and 0.02 represents the preset power ratio.

[0102] (1-2) Based on the capacity of the renewable power generation unit, obtain the second power required by the power generation unit to maintain the basic operation of the system. The second power is mainly the maximum power consumed to maintain the power generation equipment in hot standby state. When the power generation unit is wind power generation, it is necessary to maintain the oil temperature of the wind turbine gearbox to meet the starting oil temperature. At this time, the second power is mainly the power of the wind turbine gearbox oil temperature heater. The power of the wind turbine gearbox oil temperature heater is 4kW. Then the second power to maintain the basic operation of 5 wind turbines is: P2=5×4kW=20kW.

[0103] (1-3) Based on the rated capacity of the hydrogen production unit, obtain the third power required for the hydrogen production unit to maintain basic operation. Assume the third power is: P3 = 200kW.

[0104] (1-4) Based on the rated capacity of the plant power unit, the fourth power required by the plant power unit to maintain basic operation is obtained. Assume that the fourth power is: P4 = 150kW.

[0105] (1-5) The total power of the off-grid hydrogen production system is obtained by adding the first power, the second power, the third power, and the fourth power: P opt =0.02×B rated +370.

[0106] (1-6) Assuming the preset basic operation duration for maintaining the system's basic operation is 12 hours, multiplying the total power by the preset basic operation duration yields the basic maintenance capacity:

[0107] W cal =(0.02×B) rated +370)×12

[0108] Based on this, and considering the losses in lines and transformers, the capacity amplification factor is determined to be 1.2. Therefore, the basic operating maintenance capacity is determined based on the basic sustaining capacity and the capacity amplification factor.

[0109] W call =(0.02×B) rated +370)×12×1.2 (1).

[0110] (1-7) Multiply the total power by the preset system restart time (here, the wind turbine restart time) to obtain the basic restart capacity. Assuming the wind turbine restart time is 1 hour, the basic restart capacity is:

[0111] W res =(0.02×B) rated +370)×1

[0112] Based on this, and considering the losses in the lines and transformers, the capacity amplification factor is determined to be 1.2. Therefore, the restart capacity is determined based on the basic restart capacity and the capacity amplification factor.

[0113] W ress =(0.02×B) rated +370)×1×1.2 (2).

[0114] (1-8) Determine the rated energy storage capacity based on the basic operating capacity, restart capacity, and state-of-charge limitations of the energy storage units. Add the basic operating capacity and restart capacity to obtain the energy storage capacity: W con =W call +W ress .

[0115] The energy storage capacity corresponds to the capacity of the normal operating range of the energy storage unit. Based on the proportion of the normal operating range, the rated energy storage capacity is calculated. The energy storage unit has overcharge / over-discharge warning zones: the over-discharge warning line is 10%, and the overcharge warning line is 90%. The normal operating range of the energy storage is 10% to 90%, meaning the normal operating range accounts for 80% of the total capacity. Therefore, the rated energy storage capacity is: W conn =(W call +W ress Divide the equation by 0.8 and solve for the rated energy storage capacity to obtain the configuration result.

[0116] W conn =(W call +W ress 0.8 ÷ B rated (3)

[0117] Combining formulas (1), (2), and (3), the configuration result of the rated energy storage capacity is calculated as follows: B rated =11827.86885kW·h.

[0118] The process for configuring the maximum charge and discharge power of energy storage is as follows:

[0119] (2-1) Based on the total power required for the basic operation of the off-grid hydrogen production system and the lower limit of the operating power of the hydrogen production unit, and considering line and transformer losses, the maximum charging and discharging power of the energy storage is calculated.

[0120] Based on the above calculations, the rated energy storage capacity B is obtained. rated = 11827.86885 kW·h, according to the formula P opt =0.02×B rated +370 calculations yield the following total power required for the basic operation of the off-grid hydrogen production system:

[0121] P opt =0.02×B rated +370=606.557377kW (4).

[0122] The rated power of a single hydrogen production unit, along with the power of its associated gas-liquid separation frame, purification unit, cooling unit, and replica equipment such as the hydrogen compressor, are obtained as the lower limit of the operating power of the hydrogen production unit. Let's assume the obtained lower limit of the operating power of the hydrogen production unit is:

[0123] P5 = 5700kW (5).

[0124] (2-2) The total power required for the basic operation of the off-grid hydrogen production system is added to the lower limit of the operating power of the hydrogen production unit to obtain the power sum:

[0125] P dis =P opt +P5 (6)

[0126] Based on this, considering losses in the lines and transformers and adding appropriate redundancy, the power amplification factor is determined. Generally, the power amplification factor is the same as the capacity amplification factor, so it is also 1.2. Multiplying the power by the power amplification factor yields the maximum charge / discharge power of the energy storage.

[0127] P dismax =(P opt +P5)×1.2 (7)

[0128] Combining formulas (4), (5), (6), and (7), the maximum charge and discharge power of the energy storage is calculated as: P dismax =7567.8688524kW.

[0129] In practical applications, the calculated rated energy storage capacity and maximum charge / discharge power are usually rounded up. That is, the rated energy storage capacity is configured as 12MW·h and the maximum charge / discharge power is 8MW, and then fine-tuned according to the actual energy storage converter and battery specifications.

[0130] This embodiment also provides an energy storage capacity configuration system for an off-grid hydrogen production system based on renewable energy. This device is used to implement the above embodiments and preferred embodiments, and details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0131] This embodiment provides an energy storage capacity configuration system for an off-grid hydrogen production system of renewable energy. The off-grid hydrogen production system includes an energy storage unit and a hydrogen production unit. The energy storage capacity configuration includes: configuring the rated capacity of the energy storage and determining the maximum charge and discharge power of the energy storage, such as... Figure 4 As shown, the system includes:

[0132] The rated capacity configuration module 401 is used to obtain the total power required for the basic operation of the off-grid hydrogen production system and the preset basic operation requirement duration, and to determine the rated capacity of the energy storage unit according to the preset energy storage capacity configuration requirements based on the total power and the preset basic operation requirement duration.

[0133] The maximum power determination module 402 is used to obtain the lower limit of the operating power of the hydrogen production unit and to obtain the maximum charge and discharge power of the energy storage based on the total power and the lower limit of the operating power of the hydrogen production unit.

[0134] In some alternative implementations, the energy storage rated capacity configuration module 401 includes:

[0135] The basic operation maintenance capacity determination unit is used to determine the basic operation maintenance capacity of the energy storage unit based on the total power and the preset basic operation maintenance duration.

[0136] The restart capacity determination unit is used to determine the restart capacity of the energy storage unit based on the total power and the preset system restart time.

[0137] The rated capacity determination unit is used to determine the rated capacity of energy storage based on the basic operating capacity, restart capacity, and the preset capacity ratio of the energy storage unit.

[0138] In some alternative implementations, the basic operation maintenance capacity determination unit includes:

[0139] The basic capacity determination sub-unit is used to multiply the total power by the preset basic operation maintenance time to obtain the basic capacity.

[0140] The capacity amplification factor determination sub-unit is used to determine the capacity amplification factor based on the losses of the off-grid hydrogen production system.

[0141] The basic operation maintenance capacity determination sub-unit is used to determine the basic operation maintenance capacity of the energy storage unit based on the maintenance basic capacity and the capacity amplification factor.

[0142] In some optional implementations, the restart capacity determination unit includes:

[0143] The restart basic capacity determination sub-unit is used to multiply the total power by the preset system restart time to obtain the restart basic capacity.

[0144] The restart capacity determination sub-unit is used to determine the restart capacity of the energy storage unit based on the basic restart capacity and the capacity amplification factor.

[0145] In some optional implementations, the rated capacity determination unit includes:

[0146] The energy storage capacity determination sub-unit is used to add the basic operating capacity and the restart capacity to obtain the energy storage capacity.

[0147] The rated capacity determination sub-unit is used to divide the energy storage capacity by the preset capacity ratio to obtain the rated energy storage capacity.

[0148] In some alternative implementations, the maximum power determination module 402 includes:

[0149] The power and calculation unit is used to calculate the total power and the power sum of the lower limit of the operating power of the hydrogen production unit.

[0150] The power amplification factor determination unit is used to determine the power amplification factor based on the losses of the off-grid hydrogen production system.

[0151] The maximum charge / discharge power determination unit is used to multiply the power by the power amplification factor to obtain the maximum charge / discharge power of the energy storage.

[0152] Further functional descriptions of the above modules and units are the same as those in the corresponding embodiments described above, and will not be repeated here.

[0153] In this embodiment, the energy storage capacity configuration system of the off-grid hydrogen production system for renewable energy is presented in the form of functional units. Here, a unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that execute one or more software or fixed programs, and / or other devices that can provide the above functions.

[0154] This invention also provides a computer device having the above-described features. Figure 4 The energy storage capacity configuration system of the off-grid hydrogen production system for renewable energy is shown.

[0155] Please see Figure 5 , Figure 5 This is a schematic diagram of the structure of a computer device provided in an optional embodiment of the present invention, such as... Figure 5 As shown, the computer device includes one or more processors 10, memory 20, and interfaces for connecting the components, including high-speed interfaces and low-speed interfaces. The components communicate with each other via different buses and can be mounted on a common motherboard or otherwise installed as needed. The processors can process instructions executed within the computer device, including instructions stored in or on memory to display graphical information of a GUI on external input / output devices (such as display devices coupled to the interfaces). In some alternative implementations, multiple processors and / or multiple buses can be used with multiple memories and multiple memory modules, if desired. Similarly, multiple computer devices can be connected, each providing some of the necessary operations (e.g., as a server array, a group of blade servers, or a multiprocessor system). Figure 5 Take a processor 10 as an example.

[0156] Processor 10 may be a central processing unit, a network processor, or a combination thereof. Processor 10 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The programmable logic device may be a complex programmable logic device (CAMP), a field-programmable gate array (FPGA), a general-purpose array logic (GDA), or any combination thereof.

[0157] The memory 20 stores instructions executable by at least one processor 10 to cause the at least one processor 10 to perform the method shown in the above embodiments.

[0158] The memory 20 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on the use of the computer device. Furthermore, the memory 20 may include high-speed random access memory and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some alternative embodiments, the memory 20 may optionally include memory remotely located relative to the processor 10, and these remote memories may be connected to the computer device via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0159] The memory 20 may include volatile memory, such as random access memory; the memory may also include non-volatile memory, such as flash memory, hard disk or solid-state drive; the memory 20 may also include a combination of the above types of memory.

[0160] The computer device also includes a communication interface 30 for communicating with other devices or communication networks.

[0161] This invention also provides a computer-readable storage medium. The methods described above according to embodiments of the invention can be implemented in hardware or firmware, or implemented as computer code that can be recorded on a storage medium, or implemented as computer code downloaded via a network and originally stored on a remote storage medium or a non-transitory machine-readable storage medium and then stored on a local storage medium. Thus, the methods described herein can be processed by software stored on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. The storage medium can be a magnetic disk, optical disk, read-only memory, random access memory, flash memory, hard disk, or solid-state drive, etc.; further, the storage medium can also include combinations of the above types of memory. It is understood that computers, processors, microprocessor controllers, or programmable hardware include storage components capable of storing or receiving software or computer code, which, when accessed and executed by the computer, processor, or hardware, implements the methods shown in the above embodiments.

[0162] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A method for configuring the energy storage capacity of an off-grid hydrogen production system based on renewable energy, characterized in that, The off-grid hydrogen production system includes an energy storage unit and a hydrogen production unit. The energy storage capacity configuration includes: configuring the rated energy storage capacity and determining the maximum charge and discharge power of the energy storage. The method includes: The system obtains the total power required for the basic operation of the off-grid hydrogen production system and the preset basic operation requirement duration. Based on the total power and the preset basic operation requirement duration, it determines the rated energy storage capacity of the energy storage unit according to the preset energy storage capacity configuration requirements. The preset basic operation requirement duration includes: a preset basic operation maintenance duration and a preset system restart duration. Determining the rated energy storage capacity based on the total power and the preset basic operation requirement duration includes: determining the basic operation maintenance capacity of the energy storage unit based on the total power and the preset basic operation maintenance duration; determining the restart capacity of the energy storage unit based on the total power and the preset system restart duration; and determining the rated energy storage capacity based on the ratio of the basic operation maintenance capacity, the restart capacity, and the preset capacity of the energy storage unit. Obtain the lower limit of the operating power of the hydrogen production unit, and obtain the maximum charge and discharge power of the energy storage based on the total power and the lower limit of the operating power of the hydrogen production unit.

2. The method according to claim 1, characterized in that, The off-grid hydrogen production system also includes: a power generation unit and a plant power supply unit, the total power including: The first power is used to maintain the basic operation of the energy storage unit. The magnitude of the first power is determined by multiplying the rated capacity of the energy storage unit by the preset power ratio. The second power source is used to maintain the basic operation of the power generation unit; The third power source is used to maintain the basic operation of the hydrogen production unit. The fourth power source is used to maintain the basic operation of the plant's power supply unit.

3. The method according to claim 1, characterized in that, The determination of the basic operation maintenance capacity of the energy storage unit based on the total power and the preset basic operation maintenance duration includes: Multiply the total power by the preset basic operation duration to obtain the basic maintenance capacity; The capacity amplification factor is determined based on the losses of the off-grid hydrogen production system. The basic operational maintenance capacity of the energy storage unit is determined based on the maintenance capacity and the capacity expansion factor.

4. The method according to claim 3, characterized in that, The step of determining the restart capacity of the energy storage unit based on the total power and the preset system restart time includes: Multiply the total power by the preset system restart duration to obtain the basic restart capacity; The restart capacity of the energy storage unit is determined based on the basic restart capacity and the capacity amplification factor.

5. The method according to claim 1, characterized in that, The step of determining the rated energy storage capacity based on the basic operating capacity, the restart capacity, and the preset capacity ratio of the energy storage units includes: The basic operating capacity is added to the restart capacity to obtain the energy storage capacity; Divide the energy storage capacity by the preset capacity ratio to obtain the rated energy storage capacity.

6. The method according to claim 1, characterized in that, The maximum charge / discharge power of the energy storage is obtained based on the total power and the lower limit of the operating power of the hydrogen production unit, including: Calculate the sum of the total power and the lower limit of the operating power of the hydrogen production unit; The power amplification factor is determined based on the losses of the off-grid hydrogen production system. Multiplying the power by the power amplification factor yields the maximum charge / discharge power of the energy storage.

7. An energy storage capacity configuration system for an off-grid hydrogen production system based on renewable energy, characterized in that, The off-grid hydrogen production system includes an energy storage unit and a hydrogen production unit. The energy storage capacity configuration includes: configuring the rated energy storage capacity and determining the maximum charge and discharge power of the energy storage. The system includes: The energy storage rated capacity configuration module is used to obtain the total power required for the basic operation of the off-grid hydrogen production system and the preset basic operation requirement duration, and to determine the rated energy storage capacity of the energy storage unit according to the preset energy storage capacity configuration requirements based on the total power and the preset basic operation requirement duration. The preset basic operation requirement duration includes: a preset basic operation maintenance duration and a preset system restart duration. Determining the rated energy storage capacity according to the preset energy storage capacity configuration requirements based on the total power and the preset basic operation requirement duration includes: determining the basic operation maintenance capacity of the energy storage unit based on the total power and the preset basic operation maintenance duration; determining the restart capacity of the energy storage unit based on the total power and the preset system restart duration; and determining the rated energy storage capacity based on the ratio of the basic operation maintenance capacity, the restart capacity, and the preset capacity of the energy storage unit. The maximum power determination module is used to obtain the lower limit of the operating power of the hydrogen production unit, and to obtain the maximum charge and discharge power of the energy storage based on the total power and the lower limit of the operating power of the hydrogen production unit.

8. A computer device, characterized in that, include: A memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, the processor executing the computer instructions to perform the method of any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing a computer to perform the method of any one of claims 1 to 6.

Images