A power scheduling method and device and a wind-solar-hydrogen-storage coupled chemical system

Abstract

A power dispatching method, apparatus, and wind-solar-hydrogen-storage coupled chemical system are disclosed. The system includes an air separation unit and an electrolyzer. The method comprises: acquiring the current total wind and solar power generation, as well as the upper limit load power, lower limit load power, upper limit load power, and lower limit load power of the electrolyzer; determining a corresponding dispatching strategy based on the relationship between the current total wind and solar power generation and the total baseline load power; and then controlling the operation of the air separation unit and the electrolyzer according to the determined dispatching strategy. This scheme enables flexible adjustment of the operating power of each device in the wind-solar-hydrogen-storage coupled chemical system, thereby effectively improving the economic efficiency of the system.

Description

Technical Field

[0001] This disclosure relates to, but is not limited to, the field of integrated energy system optimization and dispatching technology, and particularly to a power dispatching method, device, and a wind-solar-hydrogen-storage coupled chemical system. Background Technology

[0002] The development of integrated energy systems, especially large-scale "wind-solar-storage-hydrogen + chemical" integrated energy systems, has become an important form of renewable energy development. It can significantly improve the absorption capacity and energy utilization efficiency of renewable energy, and has profound significance for promoting the in-depth development of renewable energy. However, "wind-solar-storage-hydrogen + chemical" integrated energy systems contain wind and solar power sources characterized by volatility, randomness, and intermittency, as well as electrolytic hydrogen production equipment (such as electrolyzers), energy storage batteries, and chemical equipment with varying regulation capabilities. How to coordinate these devices and fully utilize their flexible regulation characteristics is crucial for the stable and efficient operation of the integrated energy system. Summary of the Invention

[0003] The following is an overview of the subject matter described in detail herein. This overview is not intended to limit the scope of the claims.

[0004] This disclosure provides a power dispatching method, device, and wind-solar-hydrogen-storage coupled chemical system, which can coordinate various devices in the "wind-solar-storage-hydrogen + chemical" integrated energy system to achieve stable and efficient operation of the integrated energy system.

[0005] One embodiment of this disclosure provides a power dispatching method applied to a wind-solar-hydrogen-storage coupled chemical system, the wind-solar-hydrogen-storage coupled chemical system including an air separation unit and an electrolyzer; the method includes: obtaining the total wind and solar power generation at the current moment, as well as the upper limit load power of the air separation unit, the lower limit load power of the air separation unit, the upper limit load power of the electrolyzer, and the lower limit load power of the electrolyzer; determining a corresponding dispatching strategy based on the relationship between the total wind and solar power generation and the total reference load power at the current moment; and controlling the operation of the air separation unit and the electrolyzer according to the determined dispatching strategy.

[0006] One embodiment of this disclosure also provides a power dispatching device, including: a controller and a storage medium; the storage medium is used to store a program for power dispatching; the controller is used to read the program for power dispatching and execute the power dispatching method as described in any embodiment of this disclosure.

[0007] One embodiment of this disclosure also provides a wind-solar-hydrogen-storage coupled chemical system, including: an air separation unit, an electrolyzer, an energy storage battery, and a power dispatching device as described in any embodiment of this disclosure.

[0008] Compared with related technologies, the present application provides a power dispatching method, apparatus, and wind-solar-hydrogen-storage coupled chemical system. This solution identifies the air separation unit in the chemical equipment as a flexible load unit with independent operating characteristics and adjustable electrical load within a specific range, and integrates it into the wind-solar-hydrogen-storage coupled chemical system. Then, based on the relationship between the current total wind and solar power generation and the total reference load power, the dispatching strategy for the air separation unit and electrolyzer can be determined, and the operation of the air separation unit and electrolyzer can be controlled according to the determined dispatching strategy. This solution achieves flexible adjustment of the operating power of each device in the wind-solar-hydrogen-storage coupled chemical system, thereby effectively improving the economic efficiency of the system.

[0009] Other features and advantages of this disclosure will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the disclosure. Other advantages of this disclosure may be realized and obtained by means of the methods described in the description and the accompanying drawings. Attached Figure Description

[0010] The accompanying drawings are used to provide an understanding of the technical solutions of this disclosure and form part of the specification. They are used together with the embodiments of this disclosure to explain the technical solutions of this disclosure and do not constitute a limitation on the technical solutions of this disclosure.

[0011] Figure 1 This is a simplified flowchart of the power dispatching method according to an embodiment of the present disclosure; Figure 2 This is a schematic diagram of a power dispatching device according to an embodiment of the present disclosure; Figure 3 This is a schematic diagram of a wind-solar-hydrogen-storage coupled chemical system according to an embodiment of this disclosure; Figure 4 This is a flowchart illustrating the power dispatching method according to an embodiment of the present disclosure. Detailed Implementation

[0012] This disclosure describes several embodiments, but these descriptions are exemplary and not limiting, and it will be apparent to those skilled in the art that many more embodiments and implementations are possible within the scope of the embodiments described herein. Although many possible combinations of features are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are also possible. Unless specifically limited, any feature or element of any embodiment may be used in combination with, or may replace, any feature or element of any other embodiment.

[0013] This disclosure includes and contemplates combinations of features and elements known to those skilled in the art. The embodiments, features, and elements disclosed in this disclosure may also be combined with any conventional features or elements to form unique inventive solutions. Any feature or element of any embodiment may also be combined with features or elements from other inventive solutions to form another unique inventive solution. Therefore, it should be understood that any feature shown and / or discussed in this disclosure may be implemented individually or in any suitable combination. Therefore, the embodiments are not limited except by the limitations imposed by the appended claims and their equivalents. Furthermore, various modifications and changes may be made within the scope of the appended claims.

[0014] Furthermore, in describing representative embodiments, the specification may have presented methods and / or processes as a specific sequence of steps. However, the method or process should not be limited to the specific order of steps described herein, to the extent that the method or process does not depend on the specific order of steps described herein. As will be understood by those skilled in the art, other sequences of steps are also possible. Therefore, the specific order of steps set forth in the specification should not be construed as a limitation of the claims. Moreover, the claims relating to the method and / or process should not be limited to the steps performed in the order written, and those skilled in the art will readily understand that these orders can be varied and still remain within the spirit and scope of the embodiments disclosed herein.

[0015] One embodiment of this disclosure provides a power dispatching method applied to a wind-solar-hydrogen-storage coupled chemical system, wherein the wind-solar-hydrogen-storage coupled chemical system includes an air separation unit and an electrolyzer; for example... Figure 1 As shown, the method may include the following steps: Step S110: Obtain the total power of wind and solar power generation at the current moment, as well as the upper limit load power of the air separation unit, the lower limit load power of the air separation unit, the upper limit load power of the electrolyzer, and the lower limit load power of the electrolyzer. Step S120: Determine the corresponding scheduling strategy based on the relationship between the total wind and solar power generation and the total reference load power at the current moment; wherein, the total reference load power is calculated based on multiple factors including the upper limit load power of the air separation unit, the lower limit load power of the air separation unit, the upper limit load power of the electrolyzer, and the lower limit load power of the electrolyzer. Step S130: Control the operation of the air separation unit and the electrolytic cell according to the determined scheduling strategy.

[0016] For example, the air separation unit refers to a cryogenic air separation unit, which employs cryogenic separation technology.

[0017] The power dispatching method in this embodiment identifies the air separation unit in the chemical plant as a flexible load unit with independent operating characteristics and adjustable electrical load within a specific range. This unit is then integrated into the wind-solar-hydrogen-storage coupled chemical system. Based on the relationship between the current total wind and solar power generation and the total baseline load power, a dispatching strategy for the air separation unit and electrolyzer can be determined. The operation of the air separation unit and electrolyzer can then be controlled according to the determined dispatching strategy. This scheme achieves flexible adjustment of the operating power of each device in the wind-solar-hydrogen-storage coupled chemical system, thereby effectively improving the economic efficiency of the system.

[0018] In one exemplary embodiment, the total reference load power includes: a first total reference load power, which is the sum of the upper limit load power of the air separation unit and the upper limit load power of the electrolyzer; a second total reference load power, which is the sum of the upper limit load power of the air separation unit and the lower limit load power of the electrolyzer; and a third total reference load power, which is the sum of the lower limit load power of the air separation unit and the lower limit load power of the electrolyzer. The wind-solar-hydrogen-storage coupled chemical system also includes an energy storage battery; the determination of the corresponding scheduling strategy based on the relationship between the current total wind and solar power generation and the total baseline load power includes: When the total wind and solar power generation is greater than or equal to the first total reference load power at the current moment, the operating power of the air separation unit is set to the upper limit load power, the operating power of the electrolyzer is set according to the state of charge of the energy storage battery, and the energy storage battery is controlled to charge with the remaining power; wherein, the remaining power refers to the power surplus after the total wind and solar power generation supplies power to the air separation unit and the electrolyzer. If the total power of wind and solar power generation is greater than the second total reference load power and less than the first total reference load power at the current moment, the operating power of the air separation unit is set to the upper limit load power, the operating power of the electrolyzer is set to the average of the upper limit load power and the lower limit load power of the electrolyzer, and the energy storage battery is controlled to charge with the remaining power when there is remaining power, and the energy storage battery is controlled to discharge when there is no remaining power. If the total power of wind and solar power generation is greater than the third total reference load power and less than the second total reference load power at the current moment, the operating power of the air separation unit is set to the average of the upper limit load power and the lower limit load power of the air separation unit, the operating power of the electrolyzer is set to the lower limit load power, and the energy storage battery is controlled to charge with the remaining power when there is remaining power, and the energy storage battery is controlled to discharge when there is no remaining power. If the total power of wind and solar power generation at the current moment is less than or equal to the third total reference load power, the operating power of the air separation unit is set to the lower limit load power; the operating power of the electrolyzer is set to the lower limit load power, and the energy storage battery is controlled to discharge.

[0019] The power dispatching method in this embodiment identifies the air separation unit in the chemical equipment as a flexible load unit with independent operating characteristics and adjustable power load within a specific range. It dispatches the air separation unit, electrolyzer, and energy storage battery according to the relationship between the total power of wind and solar power generation and the total reference load power. By combining wind and solar power generation with energy storage battery, it can make full use of the electrical energy generated by wind and solar power generation while using energy storage battery for instantaneous power balancing. At the same time, it can reduce the installed capacity of electrolyzer and energy storage battery, which can effectively improve the economy and stability of the wind-solar-hydrogen-storage coupled chemical system.

[0020] In one example of this embodiment, the setting of the operating power of the electrolyzer based on the state of charge of the energy storage battery can be determined by the following formula: ; in, t Indicates the current moment. express t The operating power of the electrolytic cell at all times. This indicates the upper limit of the load power of the electrolytic cell. This indicates the lower limit load power of the electrolytic cell. Indicates the state of charge of the energy storage battery; This indicates the minimum state of charge of the energy storage battery. This indicates the intermediate state of charge of the energy storage battery. These represent the maximum state of charge of the energy storage battery.

[0021] The power dispatching method in this embodiment sets the operating power of the electrolyzer in the above manner. On the one hand, it can ensure that the electrolyzer can operate at a high load without exceeding the safe operating range. On the other hand, it can also ensure that the energy storage battery will not be overcharged, so as to ensure the stable and efficient operation of the wind-solar-hydrogen-storage coupled chemical system.

[0022] In one exemplary embodiment, the total wind and solar power generation is obtained by summing the wind turbine power generation and the photovoltaic power generation; obtaining the total wind and solar power generation at the current moment may include: Based on the preset installed capacity of the wind turbine, the wind power generation at the current moment is calculated according to the wind speed at the height of the wind turbine hub, the wind speed of the wind turbine, the wind speed cut-out of the wind turbine, and the rated power of the wind turbine. Based on the preset photovoltaic installed capacity, the photovoltaic power generation at the current moment is calculated according to the power derating factor of the photovoltaic system, the maximum output power of the photovoltaic array under standard conditions, the actual light intensity, the light intensity under standard conditions, the power temperature factor of the photovoltaic system, the actual surface temperature of the photovoltaic cell, and the surface temperature of the photovoltaic cell under standard conditions. The total power generated by wind and solar power is obtained by summing the power generated by the wind turbine and the power generated by the photovoltaic power.

[0023] In one example of this embodiment, calculating the wind turbine's power generation at the current moment based on the wind speed at the turbine hub height, the turbine's rated wind speed, the turbine's cut-off wind speed, and the turbine's rated power may include: The power generation of the wind turbine at the current moment is calculated using the following wind turbine output power model: ; in, express t The wind turbine's power generation capacity at any given time. v for t Wind speed at the height of the wind turbine hub at any given time. The cut-in wind speed for the fan. This refers to the rated wind speed of the wind turbine. To cut off the wind speed for the fan. This refers to the rated power of the fan.

[0024] In one example of this embodiment, calculating the photovoltaic power generation at the current moment based on the photovoltaic system's power derating factor, the maximum output power of the photovoltaic array under standard conditions, the actual illuminance, the illuminance under standard conditions, the photovoltaic system's power temperature factor, the actual surface temperature of the photovoltaic cells, and the surface temperature of the photovoltaic cells under standard conditions may include: The photovoltaic power generation at the current moment is calculated using the following photovoltaic array output power model: ; in, express t Photovoltaic power generation at any given time This represents the power derating factor of a photovoltaic system. This indicates the maximum output power of the photovoltaic array under standard conditions; express t The actual light intensity at any given time Indicates the light intensity under standard conditions. Indicates the power temperature factor of a photovoltaic system. express t The actual surface temperature of the photovoltaic cell at all times. This refers to the surface temperature of a photovoltaic cell under standard conditions.

[0025] The photovoltaic array output power model in the power dispatch method of this example takes into account the power derating factor of the photovoltaic system, which can correct for power loss caused by surface dirt, rain and snow covering, and aging of the photovoltaic panels. This makes the calculated photovoltaic power generation more accurate, thus more accurately reflecting the actual power generation capacity of the system under real operating conditions and providing a reliable data foundation for subsequent power dispatch.

[0026] In one exemplary embodiment, the upper limit load power and lower limit load power of the air separation unit are determined and pre-stored in the wind-solar-hydrogen-storage coupled chemical system in the following manner: Based on the energy consumption characteristics of the air separation unit, combined with oxygen and nitrogen production, energy consumption per unit of oxygen production, and the stable operating range of the air compressor and booster compressor, the upper limit load power and lower limit load power of the air separation unit are determined.

[0027] For example, the upper limit load power and lower limit load power of the air separation unit can be obtained through multiple experiments or through simulation, and this disclosure does not limit them.

[0028] The power dispatching method in this embodiment fully considers the energy consumption characteristics of the air separation unit, as well as various factors such as oxygen and nitrogen production, energy consumption per unit of oxygen production, and the stable operating range of the air compressor and booster compressor when determining the upper and lower load power of the air separation unit. This makes the determined upper and lower load power more accurate, thereby improving the accuracy of the dispatching strategy, allowing for more flexible adjustment of the equipment, and enhancing the economy and stability of the wind-solar-hydrogen-storage coupled chemical system.

[0029] In one exemplary embodiment, the upper limit load power and the lower limit load power of the electrolyzer are predetermined and stored in the wind-solar-hydrogen-storage coupled chemical system in the following manner: The efficiency characteristics of the electrolyzer are determined based on its type, and the power-efficiency relationship of the electrolyzer is obtained based on its efficiency characteristics. Based on the power-efficiency relationship, hydrogen production, and energy consumption per unit of hydrogen production, the upper limit load power and lower limit load power of the electrolyzer are determined.

[0030] For example, the upper limit load power and lower limit load power of the above-mentioned electrolytic cell can be obtained through multiple experiments or through simulation, and this disclosure does not limit them.

[0031] In the power dispatching method of this embodiment, when determining the upper limit load power and the lower limit load power of the empty electrolyzer, various factors such as the efficiency characteristics of the electrolyzer, the hydrogen production amount, and the energy consumption per unit of hydrogen production are fully considered, so that the determined upper limit load power and lower limit load power are more accurate. Furthermore, the accuracy of the dispatching strategy can be improved, the equipment can be adjusted more flexibly, and the economy and stability of the wind-solar-hydrogen-storage coupled chemical system can be enhanced.

[0032] An embodiment of the present disclosure also provides a power dispatching device, as Figure 2 shown, including: a controller and a storage medium; the storage medium is used to save a program for power dispatching; the controller is used to read the program for power dispatching and execute the power dispatching method as described in any embodiment of the present disclosure.

[0033] An embodiment of the present disclosure also provides a wind-solar-hydrogen-storage coupled chemical system, as Figure 3 shown, which may include: an air separation unit, an electrolyzer, a storage battery, other chemical equipment, and the power dispatching device as described in any embodiment of the present disclosure.

[0034] Among them, the other chemical equipment refers to the chemical equipment involved in the chemical process supporting the air separation unit.

[0035] In the wind-solar-hydrogen-storage coupled chemical system of this embodiment, the air separation unit in the chemical equipment is identified as a flexible load unit with independent operation characteristics and an adjustable power consumption load within a specific range, and it is integrated into the wind-solar-hydrogen-storage coupled chemical system. Furthermore, the flexible control of the air separation unit, the electrolyzer, and the storage battery can be achieved through the power dispatching device. By combining wind-solar power generation with the storage battery, while fully utilizing the electric energy generated by wind-solar power generation, the storage battery is used for instantaneous power balance, and at the same time, the installed capacity of the electrolyzer and the storage battery can be reduced, effectively enhancing the economy and stability of the wind-solar-hydrogen-storage coupled chemical system.

[0036] In an exemplary embodiment, the air separation unit refers to a cryogenic air separation unit, which adopts cryogenic separation technology.

[0037] Exemplarily, high-energy-consuming equipment such as the air compressor and booster of the air separation unit is driven by electric energy.

[0038] It should be noted that the operating power of the air separation unit disclosed herein includes the operating power of the air separation unit itself and the operating power of the chemical equipment involved in the associated chemical process. Furthermore, the associated chemical process operates stably for extended periods, and its operating power does not change over time; only the load of the air separation unit can be adjusted within a certain range. In other words, although the operating power of the air separation unit includes the total power of the air separation unit and the chemical equipment involved in the associated chemical process, the power of the chemical equipment involved in the associated chemical process is actually stable. Therefore, what is actually adjusted is only the power of the air separation unit. This identifies the air separation unit as a flexible load unit with independent operating characteristics and an adjustable electrical load within a specific range. This breaks with the conventional thinking that "in existing 'wind, solar, hydrogen storage + chemical' integrated energy systems, energy storage batteries and electrolysis hydrogen production equipment are usually considered adjustable devices for system scheduling, while chemical equipment is considered an unadjustable load." Furthermore, a power-load integrated scheduling strategy that integrates the adjustable load characteristics of air separation is realized, which can flexibly control the air separation unit, electrolyzer, and energy storage battery. By combining wind and solar power generation with energy storage battery, the power generated by wind and solar power generation can be fully utilized, while the energy storage battery can be used for instantaneous power balancing. At the same time, the installed capacity of electrolyzer and energy storage battery can be reduced, which can effectively improve the economy and stability of wind-solar-hydrogen-storage coupled chemical system.

[0039] In one exemplary embodiment, the electrolyzer can be an alkaline electrolyzer, a proton exchange membrane electrolyzer, or an electrolyzer formed by mixing an alkaline electrolyzer and a proton exchange membrane electrolyzer in a certain proportion.

[0040] In one exemplary embodiment, such as Figure 3 As shown, the wind-solar-hydrogen-storage coupled chemical system may also include a wind turbine controller, a photovoltaic controller, an energy storage controller, and an electrolyzer controller. The power dispatching device can control the wind power generation equipment, photovoltaic power generation equipment, energy storage battery, and electrolyzer respectively through the wind turbine controller, photovoltaic controller, energy storage controller, and electrolyzer controller.

[0041] For example, the wind power generation equipment may include a wind turbine, and the photovoltaic power generation equipment may include a photovoltaic array.

[0042] In one exemplary embodiment, the wind-solar-hydrogen-storage coupled chemical system may further include multiple power conversion components for converting and controlling the form, voltage level, or power flow of electrical energy at different stages within the system. For example, these components can be used to rectify AC power generated by wind turbines and photovoltaics into DC power for use in electrolytic cells, or to invert DC power from energy storage batteries into AC power to match grid or load demands.

[0043] It should be noted that, Figure 3The image only shows some of the components of the wind-solar-hydrogen-storage coupled chemical system, which may also include other components.

[0044] The power dispatching method of this disclosure will be explained in detail below with a specific example. For example... Figure 4 As shown, it may include the following steps S410-S440: Step S410: Obtain t The total power output of wind and solar power at any given moment.

[0045] For example, step S410 may include steps S411-S413.

[0046] Step S411: Based on the preset installed wind turbine capacity, calculate the wind turbine output power using a data-fitted wind turbine output power model. t Wind turbine power generation at any time .

[0047] For example, the output power of a wind turbine can be calculated using the following model. t Wind turbine power generation at any time : ; in, v for t Wind speed at the height of the wind turbine hub at any given time. The cut-in wind speed for the fan. This refers to the rated wind speed of the wind turbine. To cut off the wind speed for the fan. The rated power of the wind turbine (i.e., the preset installed capacity of the wind turbine, which can be in kW).

[0048] Step S412: Based on the preset photovoltaic installed capacity, calculate the output power of the photovoltaic array by using a photovoltaic array output power model that considers the effect of temperature. t Photovoltaic power generation at any time ; For example, the output power of a photovoltaic array can be calculated using the following photovoltaic array output power model. t Photovoltaic power generation at any time : ; in, This represents the power derating factor of a photovoltaic system. This indicates the maximum output power of the photovoltaic array under standard conditions (i.e., the preset photovoltaic installed capacity, which can be expressed in KW). express t The actual light intensity at any given time (the unit can be kW / m2). Indicates the light intensity under standard conditions. Indicates the power temperature factor of a photovoltaic system. express t The actual surface temperature of the photovoltaic cell at any given time (the unit can be ℃). This refers to the surface temperature of a photovoltaic cell under standard conditions.

[0049] For example, It can be 1 kW / m2, It can be taken as -0.47%. It can be 25℃.

[0050] The photovoltaic array output power model in step S412 takes into account the power derating factor of the photovoltaic system, which can correct for power loss caused by surface dirt, rain and snow covering, and aging of the photovoltaic panels, making the calculated photovoltaic power generation more accurate. This more accurately reflects the actual power generation capacity of the system under real operating conditions, providing a reliable data basis for subsequent power dispatch.

[0051] Step S413: For t The sum of the wind turbine power generation and the photovoltaic power generation at each moment is obtained. t The total power output of wind and solar power at any given moment.

[0052] Step S420: Obtain t Upper limit load power of the air separation unit at any time Lower limit load power of air separation unit Upper limit load power of electrolytic cells The lower limit load power of the electrolytic cell .

[0053] For example, the upper limit load power and lower limit load power of the air separation unit can be determined and pre-stored in the wind-solar-hydrogen-storage coupled chemical system in the following way: through multiple experiments or simulations, based on the energy consumption characteristics of the air separation unit, combined with oxygen and nitrogen production, energy consumption per unit of oxygen production, and the stable operating range of the air compressor and booster compressor, the maximum power at which the air separation unit can operate stably is determined as the upper limit load power of the air separation unit, and the minimum power at which the air separation unit can operate stably is determined as the lower limit load power of the air separation unit.

[0054] For example, the upper limit load power of the air separation unit can be 105% of the rated power, and the lower limit load power of the air separation unit can be 75% of the rated power. However, this disclosure does not limit it in this way.

[0055] For example, the upper limit load power and the lower limit load power of the electrolyzer are predetermined and stored in the wind-solar-hydrogen-storage coupled chemical system in the following manner: by analyzing the efficiency characteristics of different electrolyzers through multiple experiments or simulations, the power-efficiency correspondence of the electrolyzers is obtained. Then, taking into account the hydrogen production and energy consumption per unit of hydrogen production, the maximum power at which the electrolyzer can operate efficiently and stably is determined as the upper limit load power of the electrolyzer, and the minimum power at which the electrolyzer can operate efficiently and stably is determined as the lower limit load power of the electrolyzer.

[0056] Step S430: According to t The relationship between the total wind and solar power generation and the total reference load power at any given time is used to determine the corresponding dispatch strategy; wherein, the total reference load power is calculated based on multiple factors, including the upper limit load power of the air separation unit, the lower limit load power of the air separation unit, the upper limit load power of the electrolyzer, and the lower limit load power of the electrolyzer.

[0057] For example, step S430 may include: (1) When First, set the operating power of the air separation unit. Secondly, the operating power of the electrolyzer is set according to the state of charge of the energy storage battery; then, the energy storage battery is controlled to charge with the remaining power; wherein, the remaining power refers to the power surplus after the total power of wind and solar power generation supplies power to the air separation unit and the electrolyzer.

[0058] For example, the operating power of the electrolyzer can be set according to the state of charge of the energy storage battery using the following formula: ; in, t Indicates the current moment. express t The operating power of the electrolytic cell at all times. This indicates the upper limit of the load power of the electrolytic cell. This indicates the lower limit load power of the electrolytic cell. Indicates the state of charge of the energy storage battery; This indicates the minimum state of charge of the energy storage battery. This indicates the intermediate state of charge of the energy storage battery. These represent the maximum state of charge of the energy storage battery.

[0059] For example, It can be set to 0.2. It can be set to 0.5. It can be set to 0.9. It can also be adjusted according to the actual situation, and this application does not restrict it.

[0060] By setting the operating power of the electrolyzer according to the above formula, it can be ensured that the energy storage battery will not be overcharged, and that the electrolyzer can operate at a high load without exceeding the safe operating range.

[0061] (2) When First, set the operating power of the air separation unit. Secondly, the operating power of the electrolytic cell is set as follows: This ensures that the electrolyzer can operate at a high load without exceeding its safe operating range. Then, when there is surplus power, the energy storage battery is controlled to charge using that surplus power; when there is no surplus power, the energy storage battery is controlled to discharge to power the air separation unit and the electrolyzer. In other words, when there is surplus power after the total wind and solar power generation supplies the air separation unit and the electrolyzer, the energy storage battery charges to absorb the surplus power; when the total wind and solar power generation is insufficient to supply the air separation unit and the electrolyzer, the energy storage battery conveniently supplements the insufficient power.

[0062] (3) When First, set the operating power of the air separation unit. This ensures that the air separation unit can operate at a high load without exceeding the safe operating range; secondly, the operating power of the electrolytic cell is set to... Then, when there is residual power, the energy storage battery is controlled to charge with the residual power; when there is no residual power, the energy storage battery is controlled to discharge to power the air separation unit and the electrolyzer.

[0063] (4) When First, set the operating power of the air separation unit. Secondly, the operating power of the electrolytic cell is set as follows: Then, the energy storage battery is controlled to discharge in order to power the air separation unit and the electrolyzer.

[0064] As can be seen from steps (1)-(4) in S430, this scheme provides bidirectional power support through energy storage batteries, maintaining system power balance in steady state (charging to absorb excess wind and solar power and discharging to supplement insufficient power). Furthermore, this scheme also fully considers the transient processes during equipment operation: since the power regulation of the air separation unit and the electrolyzer is limited by the ramp rate and cannot respond instantaneously, the scheme utilizes the rapid charging and discharging characteristics of energy storage batteries to accurately compensate for power shortages or excesses in such dynamic processes, thereby ensuring the safe and stable operation of the system.

[0065] Step S440: Control the operation of the air separation unit and the energy storage battery of the electrolyzer according to the determined scheduling strategy.

[0066] In summary, this disclosure realizes a power dispatching method, device, and wind-solar-hydrogen-storage coupled chemical system. The scheme considers three types of regulation equipment: energy storage battery, electrolytic hydrogen production, and cryogenic air separation unit. It makes full use of wind and solar power generation and uses energy storage battery for instantaneous power balancing. At the same time, it can reduce the installed capacity of electrolyzer and energy storage battery, effectively improving the economy and stability of the wind-solar-hydrogen-storage coupled chemical system.

[0067] It will be understood by those skilled in the art that all or some of the steps, systems, or apparatuses disclosed above, and their functional modules / units, can be implemented as software, firmware, hardware, or suitable combinations thereof. In hardware implementations, the division between functional modules / units mentioned above does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed collaboratively by several physical components. Some or all components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit (ASIC). Such software may be distributed on a computer-readable medium, which may include computer storage media (or non-transitory media) and communication media (or transient media). As is known to those skilled in the art, the term "computer storage medium" includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically contain computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0068] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0069] Although embodiments of the present disclosure have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present disclosure.

Claims

1. A power dispatching method, characterized in that, The method is applied to a wind-solar-hydrogen-storage coupled chemical system, which includes an air separation unit and an electrolyzer; the method includes: Obtain the total power of wind and solar power generation at the current moment, as well as the upper limit load power of the air separation unit, the lower limit load power of the air separation unit, the upper limit load power of the electrolyzer, and the lower limit load power of the electrolyzer. Based on the relationship between the current total wind and solar power generation and the total reference load power, a corresponding dispatch strategy is determined; wherein, the total reference load power is calculated from multiple factors, including the upper limit load power of the air separation unit, the lower limit load power of the air separation unit, the upper limit load power of the electrolyzer, and the lower limit load power of the electrolyzer. The operation of the air separation unit and electrolytic cell is controlled according to the determined scheduling strategy.

2. The power dispatching method according to claim 1, characterized in that, The total reference load power includes: The first total reference load power is the sum of the upper limit load power of the air separation unit and the upper limit load power of the electrolyzer; The second total reference load power is the sum of the upper limit load power of the air separation unit and the lower limit load power of the electrolyzer. The third total reference load power is the sum of the lower limit load power of the air separation unit and the lower limit load power of the electrolyzer. The wind-solar-hydrogen-storage coupled chemical system also includes an energy storage battery; the determination of the corresponding scheduling strategy based on the relationship between the current total wind and solar power generation and the total baseline load power includes: When the total wind and solar power generation is greater than or equal to the first total reference load power at the current moment, the operating power of the air separation unit is set to the upper limit load power, the operating power of the electrolyzer is set according to the state of charge of the energy storage battery, and the energy storage battery is controlled to charge with the remaining power; wherein, the remaining power refers to the power surplus after the total wind and solar power generation supplies power to the air separation unit and the electrolyzer. If the total power of wind and solar power generation is greater than the second total reference load power and less than the first total reference load power at the current moment, the operating power of the air separation unit is set to the upper limit load power, the operating power of the electrolyzer is set to the average of the upper limit load power and the lower limit load power of the electrolyzer, and the energy storage battery is controlled to charge with the remaining power when there is remaining power, and the energy storage battery is controlled to discharge when there is no remaining power. If the total power of wind and solar power generation is greater than the third total reference load power and less than the second total reference load power at the current moment, the operating power of the air separation unit is set to the average of the upper limit load power and the lower limit load power of the air separation unit, the operating power of the electrolyzer is set to the lower limit load power, and the energy storage battery is controlled to charge with the remaining power when there is remaining power, and the energy storage battery is controlled to discharge when there is no remaining power. If the total power of wind and solar power generation at the current moment is less than or equal to the third total reference load power, the operating power of the air separation unit is set to the lower limit load power; the operating power of the electrolyzer is set to the lower limit load power, and the energy storage battery is controlled to discharge.

3. The power dispatching method according to claim 2, characterized in that, The operating power of the electrolyzer is set according to the state of charge of the energy storage battery, using the following formula: ； in, t Indicates the current moment. express t The operating power of the electrolytic cell at all times. This indicates the upper limit of the load power of the electrolytic cell. This indicates the lower limit load power of the electrolytic cell. Indicates the state of charge of the energy storage battery; This indicates the minimum state of charge of the energy storage battery. This indicates the intermediate state of charge of the energy storage battery. These represent the maximum state of charge of the energy storage battery.

4. The power dispatching method according to claim 1, characterized in that, The total wind and solar power generation is obtained by summing the wind turbine power generation and the photovoltaic power generation; obtaining the total wind and solar power generation at the current moment includes: Based on the preset installed capacity of the wind turbine, the wind power generation at the current moment is calculated according to the wind speed at the height of the wind turbine hub, the wind speed of the wind turbine, the wind speed cut-out of the wind turbine, and the rated power of the wind turbine. Based on the preset photovoltaic installed capacity, the photovoltaic power generation at the current moment is calculated according to the power derating factor of the photovoltaic system, the maximum output power of the photovoltaic array under standard conditions, the actual light intensity, the light intensity under standard conditions, the power temperature factor of the photovoltaic system, the actual surface temperature of the photovoltaic cell, and the surface temperature of the photovoltaic cell under standard conditions. The total power generated by wind and solar power is obtained by summing the power generated by the wind turbine and the power generated by the photovoltaic power.

5. The power dispatching method according to claim 4, characterized in that, The calculation of the wind turbine's power generation at the current moment, based on the wind speed at the turbine hub height, the turbine's rated wind speed, the turbine's cut-off wind speed, and the turbine's rated power, includes: The power generation of the wind turbine at the current moment is calculated using the following wind turbine output power model: ； in, express t The wind turbine's power generation capacity at any given time. v for t Wind speed at the height of the wind turbine hub at any given time. The cut-in wind speed for the fan. This refers to the rated wind speed of the wind turbine. To cut off the wind speed for the fan. This refers to the rated power of the fan.

6. The power dispatching method according to claim 4, characterized in that, The calculation of the photovoltaic power generation at the current moment, based on the photovoltaic system's power derating factor, the maximum output power of the photovoltaic array under standard conditions, the actual irradiance, the irradiance under standard conditions, the photovoltaic system's power temperature factor, the actual surface temperature of the photovoltaic cells, and the surface temperature of the photovoltaic cells under standard conditions, includes: The photovoltaic power generation at the current moment is calculated using the following photovoltaic array output power model: ； in, express t Photovoltaic power generation at any given time This represents the power derating factor of a photovoltaic system. This indicates the maximum output power of the photovoltaic array under standard conditions; express t The actual light intensity at any given time Indicates the light intensity under standard conditions. Indicates the power temperature factor of a photovoltaic system. express t The actual surface temperature of the photovoltaic cell at all times. This refers to the surface temperature of a photovoltaic cell under standard conditions.

7. The power dispatching method according to claim 1, characterized in that, The upper limit load power and lower limit load power of the air separation unit are determined and pre-stored in the wind-solar-hydrogen-storage coupled chemical system in the following manner: Based on the energy consumption characteristics of the air separation unit, combined with oxygen and nitrogen production, energy consumption per unit of oxygen production, and the stable operating range of the air compressor and booster compressor, the upper limit load power and lower limit load power of the air separation unit are determined.

8. The power dispatching method according to claim 1, characterized in that, The upper limit load power and lower limit load power of the electrolyzer are predetermined and stored in the wind-solar-hydrogen-storage coupled chemical system in the following manner: The efficiency characteristics of the electrolyzer are determined based on its type, and the power-efficiency relationship of the electrolyzer is obtained based on its efficiency characteristics. Based on the power-efficiency relationship, hydrogen production, and energy consumption per unit of hydrogen production, the upper limit load power and lower limit load power of the electrolyzer are determined.

9. A power dispatching device, characterized in that, include: Controller and storage media; The storage medium is used to store programs for power dispatching; The controller is configured to read the program for power dispatch and execute the power dispatch method as described in any one of claims 1 to 8.

10. A wind-solar-hydrogen-storage coupled chemical system, characterized in that, include: An air separation unit, an electrolyzer, an energy storage battery, and a power dispatching device as described in claim 9.

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