A Modeling Method for a Solid Oxide Fuel Cell and an Energy Hub for Power-to-Gas

Abstract

The present invention provides a method for modeling a solid oxide fuel cell and an energy hub for power-to-gas. The method for modeling the energy hub includes: predicting the change curve of the heat load demand and the total heat load demand in the heating area during the target period; constructing an energy hub model; testing the heat storage loss coefficient of the heat storage device in the target period of its environment; inputting the change curve of the heat load demand, the total heat load demand, and the heat storage loss coefficient to simulate the energy hub model; calculating the heat loss of the heat storage device; adjusting the first ratio of the first part of hydrogen and the second part of hydrogen in the first total amount of hydrogen, and the second ratio of the first part of methane and the second part of methane in the first total amount of methane, and solving for the values of the first ratio and the second ratio when the heat loss of the heat storage device is minimized. The present invention solves the problem of large heat storage loss when the energy hub stores heat to cope with high load demand.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and more specifically, to a solid oxide fuel cell and an energy hub modeling method for power-to-gas conversion. Background Art

[0002] In recent years, China has gradually focused its work in the energy field on building an economically efficient modern energy system, striving to increase the consumption of clean energy and promoting the healthy ecological development of the energy industry. The energy hub involves multiple energy forms, and its core is to achieve the economic and efficient utilization of energy. Due to the characteristics and development differences of different energy forms, energy supply systems are often independently planned, designed, and operated, lacking interaction with each other, and thus unable to ensure the efficient utilization and safe and reliable operation of energy. The energy hub can effectively integrate multiple energy forms, greatly improve the energy utilization efficiency while meeting the energy supply demand, and achieve the cascaded utilization of energy.

[0003] Currently, when the energy hub model performs electricity-gas-heat conversion in advance, it is unable to estimate the user's demand for heat load, resulting in a large waste due to the energy loss of the energy storage device itself. Summary of the Invention

[0004] The problem solved by the present invention is that when the energy hub model performs electricity-gas-heat conversion in advance, it is unable to estimate the user's demand for heat load, resulting in a large waste due to the energy loss of the energy storage device itself.

[0005] To solve the above problems, the present invention provides a method for modeling a solid oxide fuel cell and an electricity-to-gas energy hub. The energy hub modeling method includes: Step S1: Predict the heat load demand change curve and the total heat load demand in the heating area during the target period; Step S2: Construct an energy hub model. The energy hub model includes a hydrogen production device, a methane production device, a hydrogen gas turbine, a methane gas turbine, a gas boiler, a heat storage device, and a storage battery; Step S3: Test the heat storage loss coefficient of the heat storage device during the target period in its environment; Step S4: Input the heat load demand change curve, the total heat load demand, and the heat storage loss coefficient, and simulate the energy hub model. Simulating the energy hub model specifically includes: Before the peak period of heat load change, connect the energy hub to the power grid. The hydrogen production device obtains hydrogen by electrolyzing water, and according to the first total amount of hydrogen generated, the first part of hydrogen and the second part of hydrogen are respectively derived. The first part of hydrogen is introduced into the hydrogen gas turbine for power generation and heat production, and the second part of hydrogen is used for the methane production device to prepare methane. The first total amount of methane produced is respectively derived into the first part of methane and the second part of methane. The first part of methane is introduced into the methane gas turbine for power generation and heat production, and the second part of methane and the natural gas connected to the natural gas network are introduced into the gas boiler for heat production. The heat supplied by the hydrogen gas turbine, the methane gas turbine, and the gas boiler is at least partially stored in the heat storage device, and the rest is directly supplied to the heating area. The power generated by the hydrogen gas turbine and the methane gas turbine is stored in the storage battery; At the beginning of the peak period of heat load change, increase the direct heat supply of the hydrogen gas turbine, the methane gas turbine, and the gas boiler to the heating area and / or turn on the heat storage device to supply heat to the heating area; Before the end of the peak period of heat load change, turn off the energy hub, and only keep the heat storage device and the natural gas network to supply heat to the heating area; At the end of the peak period of heat load change, turn off the heat storage device; Step S5: Calculate the heat loss of the heat storage device during the period from when the energy hub is connected to the power grid this time to when the energy hub is connected to the power grid next time; Step S6: Adjust the first ratio of the first part of hydrogen and the second part of hydrogen in the first total amount of hydrogen, and the second ratio of the first part of methane and the second part of methane in the first total amount of methane, and solve for the values of the first ratio and the second ratio when the heat loss of the heat storage device is minimized.

[0006] Technical effects achieved after adopting this technical solution: Predict the change curve of the heat load demand in the heating area, which is convenient for analyzing the change of the actual heating demand, so as to adjust the heating method and heating time, reduce the subsequent waste of early heat storage, reduce the heat storage loss, and also avoid the insufficient load retention of the heat storage device when a high heat load is required; Predict the total heat load demand, which is convenient for reducing unnecessary excessive heat storage while meeting the heat load demand, thus avoiding the heat storage loss when the heat load demand decreases; Through the hydrogen production device and the methane production device, the energy storage of power-to-gas can be realized, which is convenient for subsequent energy storage in the energy storage device, so as to release heat when needed; Hydrogen production is a necessary step for methane production. On this basis, hydrogen combustion heats up faster, and the heat generated by the combustion of the produced methane is more than that generated by the combustion of the original hydrogen. Therefore, according to these two characteristics, the ratio of hydrogen and methane is allocated, which is convenient for adjusting the heat storage method in different heating stages, so as to meet the heat load demand while reducing heat loss; The electricity generated by the hydrogen gas turbine and the methane gas turbine is stored in the battery. The electricity of the battery can be used for additional power supply when the electricity load demand is high, or it can be used for heat production to further increase the heat load, which is equivalent to another heat storage method. Heat storage is carried out before the peak period of heat load change, so that the heat storage device can have enough heat load during the peak period of heat load change, which is convenient for heat release. During this stage, the hydrogen gas turbine, the methane gas turbine and the gas boiler directly supply heat to meet the basic heat load demand, and the heat storage device is turned off, which is convenient for improving its heat storage efficiency; When the peak period of heat load change starts, increasing the heat supply of the hydrogen gas turbine, the methane gas turbine and the gas boiler or turning on the heat supply of the heat storage device can further meet the heat load demand; Close before the end of the peak period of heat load change, that is, when the heat load of the heat storage device can meet the requirements, preferentially consume the heat stored in the heat storage device, and avoid the waste or natural loss of the remaining heat in the heat storage device after the end of the peak period of heat load change when the demand decreases.

[0007] Further, step S5 specifically includes: recording the change curve of the load retention of the heat storage device during the period from when the energy hub is connected to the power grid this time to the next time the energy hub is connected to the power grid, and combining the heat storage loss coefficient to solve the heat loss of the heat storage device.

[0008] Technical effects achieved after adopting this technical solution: The change curve of the load retention reflects the load retention of the energy storage device at each moment, and the more the load retention, the more the heat storage loss. Therefore, calculating the heat storage loss at each moment according to the load retention and the heat storage loss coefficient can obtain the total heat loss of the heat storage device. Except for the necessary heat storage load, adjusting the heat storage time and the heat storage amount is convenient for reducing the heat storage loss.

[0009] Further, in step S4, simulating the energy hub model further includes: when the meteorological condition change in the heating area on the current day does not meet the first meteorological condition, or the heating satisfaction degree in the heating area does not meet the first satisfaction condition, the battery is turned on for electric heating before the peak period of heat load change; the heat generated by the electric heating, as well as the heat supply of the hydrogen gas turbine, the methane gas turbine and the gas boiler, are at least partially stored in the heat storage device, and the rest is directly used for heating the heating area.

[0010] The technical effects achieved by adopting this technical solution: Meteorological conditions will bring significant changes in heat storage demand, and according to the heating satisfaction degree, it can be reflected whether the current heating meets the user's needs. Therefore, through comprehensive judgment, it can be obtained whether the energy hub needs to increase heat production; if the conditions are met, electric heating can further increase heat production and improve the heat load, or directly heat the heating area, thus further meeting the user's needs.

[0011] Further, in step S4, simulating the energy hub model further includes: the battery has a minimum preset power. When the power of the battery reaches the minimum preset power, the electric heating power of the battery is at most the sum of the power generation of the hydrogen gas turbine and the methane gas turbine.

[0012] The technical effects achieved by adopting this technical solution: When the power of the battery reaches the minimum preset power, it cannot supply emergency power when the electric load demand is high, nor can it supply emergency heating when the meteorological conditions are poor. Therefore, at this time, it is necessary to increase power storage and improve the power generation of the hydrogen gas turbine or the methane gas turbine.

[0013] Further, in step S4, simulating the energy hub model further includes: the battery has a maximum preset power. When the power of the battery reaches the maximum preset power, the hydrogen gas turbine and the methane gas turbine stop operating, and all the hydrogen obtained by the hydrogen production device through electrolysis of water is used for the methane production device to produce methane. The methane produced by the methane production device and the natural gas accessed from the natural gas network are fed into the gas boiler together for heat production.

[0014] The technical effects achieved by adopting this technical solution: When the power of the battery reaches the maximum preset power, there is no need to store power anymore. At this time, more chemical energy of hydrogen and methane can be converted into heat energy, that is, fed into the gas boiler for heat production, so as to be used for heat storage or direct heating.

[0015] Further, in step S4, the simulation of the energy hub model further includes: setting the maximum heat load retention capacity of the heat storage device; before the peak period of heat load change, when the heat storage device reaches the maximum heat load retention capacity, the hydrogen gas turbine, the methane gas turbine and the gas boiler supply heat to the heat storage device intermittently for heat preservation, and the rest directly supply heat to the heating area, and the heat storage device is prohibited from directly supplying heat; at the beginning of the peak period of heat load change, when the heat storage device reaches the maximum heat load retention capacity, the hydrogen gas turbine, the methane gas turbine, the gas boiler and the heat storage device directly supply heat to the heating area, and increase the proportion of the second part of methane in the total amount of methane in the first part; before the end of the peak period of heat load change, when the heat storage device reaches the maximum heat load retention capacity, the energy hub is shut down in advance, and only the heat storage device and the natural gas network supply heat to the heating area.

[0016] The technical effects achieved by adopting this technical solution: before the peak period of heat load change, the heat storage device reaches the maximum heat load retention capacity. At this time, the intermittent heat supply avoids the decrease of the heat load of the heat storage device and avoids coping with the peak of heat load change; and at this time, by calculating the heat loss of the heat storage device, the start time of heat storage of the heat storage device in the energy hub model is adjusted, and the situation that the heat storage device has reached the maximum heat load retention capacity before the peak period of heat load change can be reduced, and the heat loss during this period can be reduced, so as to achieve the effect of energy saving.

[0017] Further, in step S4, the simulation of the energy hub model further includes: setting the minimum heat load retention capacity of the heat storage device; before the peak period of heat load change and after the energy hub is connected to the power grid, when the heat storage device is lower than the minimum heat load retention capacity, increase the proportion of the first part of methane in the total amount of methane in the first part.

[0018] The technical effects achieved by adopting this technical solution: before the peak period of heat load change and after the energy hub is connected to the power grid, that is, the energy hub model has started to prepare for the energy storage of the energy storage device. At this time, if the energy storage device is at the minimum heat load retention capacity, it is necessary to quickly increase the heat load of the energy storage. Increasing the proportion of the first part of methane in the total amount of methane in the first part can increase the energy storage capacity brought by the methane gas turbine. This energy storage capacity includes the energy supply of the methane gas turbine directly generating heat to the energy storage device, and also includes the energy supply of the energy storage device generating electricity first and then generating heat to the energy storage device.

[0019] Further, step S6 specifically includes: if the duration of the peak period of heat load change meets the first duration condition and the peak value of heat load change does not meet the first peak condition, increase the proportion of the second part of hydrogen in the total amount of hydrogen; if the duration of the peak period of heat load change does not meet the first duration condition and the peak value of heat load change meets the first peak condition, increase the proportion of the first part of hydrogen in the total amount of hydrogen; if the duration of the peak period of heat load change meets the first duration condition and the peak value of heat load change meets the first peak condition, increase the total amount of hydrogen.

[0020] The technical effects achieved by adopting this technical solution: when the duration of the peak period of heat load change meets the first duration condition, the duration is relatively long, and at this time, continuous and more heat production is required. Therefore, the amount of hydrogen converted to methane is increased, thereby increasing the final total heat; when the peak value of heat load change meets the first peak condition, the peak value of heat load demand is relatively large, and at this time, rapid heating is required. Therefore, the amount of hydrogen directly burned and used for power generation is increased, thereby efficiently producing heat; when both conditions are met, further increasing the production amount of hydrogen can improve both the heat production efficiency and the heat production amount per unit time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a flowchart of a method for modeling an energy hub of a solid oxide fuel cell and power-to-gas

[0022] Figure 2 It is a schematic structural diagram of the energy hub model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The purpose of the present invention is to provide a flowchart of a method for modeling an energy hub of a solid oxide fuel cell and power-to-gas, which is used to achieve the effect of reducing heat storage loss when the energy hub stores heat to cope with high load demand.

[0024] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the specific embodiments of the present invention will be given with reference to the accompanying drawings.

[0025] See Figure 1 - Figure 2, the present invention provides a solid oxide fuel cell and an energy hub modeling method for power-to-gas. The energy hub modeling method includes: Step S1: Predict the change curve of the heat load demand and the total heat load demand in the heating area during the target period; Step S2: Construct an energy hub model. The energy hub model includes a hydrogen production device, a methane production device, a hydrogen gas turbine, a methane gas turbine, a gas boiler, a heat storage device, and a battery; Step S3: Test the heat storage loss coefficient of the heat storage device during the target period in its environment; Step S4: Input the heat load demand change curve, the total heat load demand, and the heat storage loss coefficient, and simulate the energy hub model. Simulating the energy hub model specifically includes: Before the peak period of heat load change, connect the energy hub to the power grid. The hydrogen production device obtains hydrogen by electrolyzing water, and according to the generated first total amount of hydrogen, the first part of hydrogen and the second part of hydrogen are respectively derived. The first part of hydrogen is introduced into the hydrogen gas turbine for power generation and heat production, and the second part of hydrogen is used for the methane production device to prepare methane. The first total amount of methane obtained is respectively derived into the first part of methane and the second part of methane. The first part of methane is introduced into the methane gas turbine for power generation and heat production, and the second part of methane and the natural gas connected to the natural gas network are introduced into the gas boiler for heat production. The heat supplied by the hydrogen gas turbine, the methane gas turbine, and the gas boiler is at least partially stored in the heat storage device, and the rest is directly supplied to the heating area. The power generated by the hydrogen gas turbine and the methane gas turbine is stored in the battery; At the beginning of the peak period of heat load change, increase the direct heat supply of the hydrogen gas turbine, the methane gas turbine, and the gas boiler to the heating area and / or turn on the heat storage device to supply heat to the heating area; Before the end of the peak period of heat load change, turn off the energy hub, and only keep the heat storage device and the natural gas network to supply heat to the heating area; At the end of the peak period of heat load change, turn off the heat storage device; Step S5: Calculate the heat loss of the heat storage device during the period from when the energy hub is connected to the power grid this time to when the energy hub is connected to the power grid next time; Step S6: Adjust the first ratio of the first part of hydrogen and the second part of hydrogen in the first total amount of hydrogen, and the second ratio of the first part of methane and the second part of methane in the first total amount of methane, and solve for the values of the first ratio and the second ratio when the heat loss of the heat storage device is minimized.

[0026] It should be noted that predicting the change curve of the heat load demand in the heating area facilitates the analysis of the changes in the actual heating demand, thereby adjusting the heating method and heating time, reducing situations such as subsequent waste of early heat storage, reducing heat storage loss, and also avoiding insufficient heat load retention in the heat storage device when a relatively high heat load is required; predicting the total heat load demand facilitates reducing unnecessary excessive heat storage while meeting the heat load demand, thereby avoiding heat storage loss when the heat load demand decreases; through the hydrogen production device and the methane production device, the energy storage of power-to-gas can be realized, which is convenient for subsequent energy storage in the energy storage device, and then releasing heat when needed; hydrogen production is a necessary step for methane production. On this basis, hydrogen combustion heats up faster, and the heat generated by the combustion of the produced methane is more than that generated by the combustion of the original hydrogen. Therefore, according to these two characteristics, the ratio of hydrogen and methane is allocated to facilitate the adjustment of the heat storage method in different heating stages, so as to meet the heat load demand while reducing heat loss; the electricity generated by the hydrogen gas turbine and the methane gas turbine is stored in the battery, and the electricity of the battery can be used for additional power supply when the electricity load demand is high, or it can also be used for heat production to further increase the heat load, which is equivalent to another heat storage method. Heat storage is carried out before the peak time period of the heat load change, so that the heat storage device can have sufficient heat load during the peak time period of the heat load change, which is convenient for heat release. During this stage, the hydrogen gas turbine, the methane gas turbine and the gas boiler directly supply heat to meet the basic heat load demand, and the heat storage device is turned off to improve its heat storage efficiency; when the peak time period of the heat load change starts, increasing the heat supply of the hydrogen gas turbine, the methane gas turbine and the gas boiler or turning on the heat supply of the heat storage device can further meet the heat load demand; it is turned off before the end of the peak time period of the heat load change, that is, when the heat load of the heat storage device can meet the requirements, the heat stored in the heat storage device is preferentially consumed to avoid waste or natural loss of the remaining heat in the heat storage device after the end of the peak time period of the heat load change when the demand decreases.

[0027] Preferably, in step S4, the simulation of the energy hub model specifically includes: screening the time periods with a heat load greater than the target heat load value in the heat load demand change curve, and when the interval between adjacent time periods is less than the interval threshold, merging the adjacent time periods to obtain the peak time period of the heat load change.

[0028] In a specific embodiment, step S5 specifically includes: recording the change curve of the load retention of the heat storage device during the period from when the energy hub is connected to the power grid this time to the next time the energy hub is connected to the power grid, and combining the heat storage loss coefficient to solve the heat loss of the heat storage device.

[0029] It should be noted that the load retention curve reflects the load retention of the energy storage device at each moment. The more the load retention, the more the heat storage loss. Therefore, by calculating the heat storage loss at each moment based on the load retention and the heat storage loss coefficient, the total heat loss of the heat storage device can be obtained. In addition to the necessary heat storage load, adjusting the heat storage time and the heat storage amount can help reduce the heat storage loss.

[0030] In a specific embodiment, in step S4, when simulating the energy hub model, it further includes: if the meteorological condition change in the heating area of the previous day does not meet the first meteorological condition, or the heating satisfaction degree of the heating area does not meet the first satisfaction condition, then before the peak period of the heat load change, the battery is turned on for electric heating; at least part of the heat generated by the electric heating, as well as the heat supplied by the hydrogen gas turbine, the methane gas turbine and the gas boiler, is stored in the heat storage device, and the rest is directly supplied to the heating area for heating.

[0031] It should be noted that the meteorological condition will bring significant changes in the heat storage demand, and according to the heating satisfaction degree, it can be reflected whether the current heating meets the user's demand. Therefore, through comprehensive judgment, it can be obtained whether the energy hub needs to increase heat production; if the condition is met, the electric heating can further increase heat production and improve the heat load, or directly supply heat to the heating area, so as to further meet the user's demand.

[0032] In a specific embodiment, in step S4, when simulating the energy hub model, it further includes: the battery has a minimum preset power. When the power of the battery reaches the minimum preset power, the electric heating power of the battery is at most the sum of the power generation of the hydrogen gas turbine and the methane gas turbine.

[0033] It should be noted that when the power of the battery reaches the minimum preset power, it cannot supply emergency power when the electric load demand is high, nor can it supply emergency heating when the meteorological condition is poor. Therefore, at this time, it is necessary to increase electricity storage and improve the power generation of the hydrogen gas turbine or the methane gas turbine.

[0034] In a specific embodiment, in step S4, when simulating the energy hub model, it further includes: the battery has a maximum preset power. When the power of the battery reaches the maximum preset power, the hydrogen gas turbine and the methane gas turbine stop operating, and all the hydrogen obtained by the electrolysis of water by the hydrogen production device is used by the methane production device to produce methane. The methane produced by the methane production device and the natural gas connected to the natural gas network are fed into the gas boiler together to produce heat.

[0035] It should be noted that when the power of the battery reaches the maximum preset power, there is no need to store electricity anymore. At this time, more chemical energy of hydrogen and methane can be converted into heat energy, that is, fed into the gas boiler to produce heat, so as to be used for heat storage or directly for heating.

[0036] In a specific embodiment, in step S4, when simulating the energy hub model, it further includes: setting the maximum heat load retention capacity of the heat storage device; before the peak time period of heat load change, when the heat storage device reaches the maximum heat load retention capacity, the hydrogen gas turbine, the methane gas turbine, and the gas boiler supply heat to the heat storage device intermittently for heat preservation, and the rest directly supply heat to the heating area, and the heat storage device is prohibited from directly supplying heat; at the beginning of the peak time period of heat load change, when the heat storage device reaches the maximum heat load retention capacity, the hydrogen gas turbine, the methane gas turbine, the gas boiler, and the heat storage device directly supply heat to the heating area, increasing the proportion of the second part of methane in the first total amount of methane; before the end of the peak time period of heat load change, when the heat storage device reaches the maximum heat load retention capacity, the energy hub is shut down in advance, and only the heat storage device and the natural gas network supply heat to the heating area.

[0037] It should be noted that before the peak time period of heat load change, when the heat storage device reaches the maximum heat load retention capacity, intermittent heat supply can avoid the decrease of the heat load of the heat storage device and cope with the peak of heat load change; and at this time, by calculating the heat loss of the heat storage device, the start time of heat storage of the heat storage device in the energy hub model can be adjusted, reducing the situation that the heat storage device has reached the maximum heat load retention capacity before the peak time period of heat load change, which can reduce the heat loss during this period, thereby achieving the effect of energy saving.

[0038] In a specific embodiment, in step S4, when simulating the energy hub model, it further includes: setting the minimum heat load retention capacity of the heat storage device; before the peak time period of heat load change and after the energy hub is connected to the power grid, when the heat storage device is lower than the minimum heat load retention capacity, increasing the proportion of the first part of methane in the first total amount of methane.

[0039] It should be noted that before the peak time period of heat load change and after the energy hub is connected to the power grid, that is, the energy hub model has started to prepare for the energy storage of the energy storage device. At this time, if the energy storage device is at the minimum heat load retention capacity, it is necessary to increase the heat load of the energy storage as soon as possible. Increasing the proportion of the first part of methane in the first total amount of methane can increase the stored energy brought by the methane gas turbine. The stored energy includes the energy supply to the energy storage device by the direct heat production of the methane gas turbine and the energy supply to the energy storage device by the energy storage device generating electricity first and then producing heat.

[0040] In a specific embodiment, step S6 specifically includes: if the duration of the peak period of heat load change meets the first duration condition and the peak value of heat load change does not meet the first peak condition, increase the proportion of the second part of hydrogen in the total amount of hydrogen; if the duration of the peak period of heat load change does not meet the first duration condition and the peak value of heat load change meets the first peak condition, increase the proportion of the first part of hydrogen in the total amount of hydrogen; if the duration of the peak period of heat load change meets the first duration condition and the peak value of heat load change meets the first peak condition, increase the total amount of hydrogen.

[0041] It should be noted that when the duration of the peak period of heat load change meets the first duration condition, the duration is relatively long, and at this time, continuous and more heat generation is required. Therefore, the amount of hydrogen converted into methane is increased, thereby increasing the final total heat; when the peak value of heat load change meets the first peak condition, the peak value of heat load demand is relatively large, and at this time, rapid heating is required. Therefore, the amount of hydrogen directly burned and used for power generation is increased, thereby efficiently generating heat; when both conditions are met, further increasing the amount of hydrogen production can improve both the heat generation efficiency and the heat generation amount per unit time.

[0042] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined by the claims.

Claims

1. A method for modeling a solid oxide fuel cell and an energy hub for power-to-gas, characterized in that, The energy hub modeling method includes: Step S1: Predict the heat load demand change curve and total heat load demand in the heating area during the target period; Step S2: Construct an energy hub model; the energy hub model includes a hydrogen production device, a methane production device, a hydrogen gas turbine, a methane gas turbine, a gas boiler, a heat storage device, and a storage battery; Step S3: Test the heat storage loss coefficient of the heat storage device during the target period in its environment; Step S4: Input the heat load demand change curve, total heat load demand, and heat storage loss coefficient, and simulate the energy hub model; the simulation of the energy hub model specifically includes: before the peak period of heat load change, connect the energy hub to the power grid. The hydrogen production device obtains hydrogen through electrolysis of water. According to the generated first total amount of hydrogen, the first part of hydrogen and the second part of hydrogen are respectively derived. The first part of hydrogen is introduced into the hydrogen gas turbine for power generation and heat production. The second part of hydrogen is used in the methane production device to prepare methane. The first total amount of methane produced is respectively derived into the first part of methane and the second part of methane. The first part of methane is introduced into the methane gas turbine for power generation and heat production. The second part of methane and the natural gas connected to the natural gas network are introduced into the gas boiler for heat production together. The heat generated by the hydrogen gas turbine, the methane gas turbine, and the gas boiler is at least partially stored in the heat storage device, and the rest is directly supplied to the heating area. The power generated by the hydrogen gas turbine and the methane gas turbine is stored in the storage battery; at the beginning of the peak period of heat load change, increase the direct heat supply of the hydrogen gas turbine, the methane gas turbine, and the gas boiler to the heating area and / or turn on the heat storage device to supply heat to the heating area; before the end of the peak period of heat load change, turn off the energy hub, and only keep the heat storage device and the natural gas network to supply heat to the heating area; at the end of the peak period of heat load change, turn off the heat storage device; Step S5: Calculate the heat loss of the heat storage device during the period from when the energy hub is connected to the power grid this time to the next time the energy hub is connected to the power grid; Step S6: Adjust the first ratio of the first part of hydrogen and the second part of hydrogen in the first total amount of hydrogen, and the second ratio of the first part of methane and the second part of methane in the first total amount of methane, and solve for the values of the first ratio and the second ratio when the heat loss of the heat storage device is minimized.

2. The energy hub modeling method according to claim 1, characterized in that The specific content of Step S5 includes: Record the change curve of the load retention of the heat storage device during the period from when the energy hub is connected to the power grid this time to the next time the energy hub is connected to the power grid, and combine the heat storage loss coefficient to solve for the heat loss of the heat storage device.

3. The energy hub modeling method according to claim 1, characterized in that In Step S4, the simulation of the energy hub model further includes: If the change in meteorological conditions in the heating area on the current day does not meet the first meteorological condition, or the heating satisfaction degree in the heating area does not meet the first satisfaction condition, then before the peak time period of heat load change, the storage battery is turned on for electric heating; the heat generated by the electric heating, and the heat supply of the hydrogen gas turbine, the methane gas turbine, and the gas boiler are at least partially stored in the heat storage device, and the rest is directly used for heating the heating area.

4. The energy hub modeling method according to claim 3, characterized in that, In the step S4, the simulation of the energy hub model further includes: The storage battery has a minimum preset power. When the power of the storage battery reaches the minimum preset power, the electric heating power of the storage battery is at most the sum of the power generation powers of the hydrogen gas turbine and the methane gas turbine.

5. The energy hub modeling method according to claim 1, characterized in that In the step S4, the simulation of the energy hub model further includes: The storage battery has a maximum preset power. When the power of the storage battery reaches the maximum preset power, the hydrogen gas turbine and the methane gas turbine stop operating, and all the hydrogen obtained by the electrolysis of water by the hydrogen production device is used for the methane production device to produce methane. The methane produced by the methane production device and the natural gas accessed from the natural gas network are fed into the gas boiler together for heat production.

6. The energy hub modeling method according to claim 1, characterized in that In the step S4, the simulation of the energy hub model further includes: The heat storage device sets a maximum heat load retention amount; Before the peak time period of heat load change, when the heat storage device reaches the maximum heat load retention amount, the hydrogen gas turbine, the methane gas turbine, and the gas boiler supply heat to the heat storage device intermittently for heat preservation, and the rest is directly used for heating the heating area. The heat storage device is prohibited from directly supplying heat; At the start of the peak time period of heat load change, when the heat storage device reaches the maximum heat load retention amount, the hydrogen gas turbine, the methane gas turbine, the gas boiler, and the heat storage device directly supply heat to the heating area, and increase the proportion of the second part of methane in the total amount of the first methane; Before the end of the peak time period of heat load change, when the heat storage device reaches the maximum heat load retention amount, the energy hub is closed in advance, and only the heat storage device and the natural gas network are used for heating the heating area.

7. The energy hub modeling method according to claim 1, wherein In the step S4, the simulation of the energy hub model further includes: The heat storage device sets a minimum heat load retention amount; Before the peak time period of heat load change, and after the energy hub is connected to the power grid, when the heat storage device is lower than the minimum heat load retention amount, increase the proportion of the first part of methane in the total amount of the first methane.

8. The energy hub modeling method according to claim 1, characterized in that The step S6 specifically includes: If the duration of the peak time period of heat load change meets the first duration condition and the peak value of heat load change does not meet the first peak condition, then increase the proportion of the second part of hydrogen in the total amount of the first hydrogen; If the duration of the peak time period of heat load change does not meet the first duration condition and the peak value of heat load change meets the first peak condition, then increase the proportion of the first part of hydrogen in the total amount of the first hydrogen; If the duration of the peak time period of heat load change meets the first duration condition and the peak value of heat load change meets the first peak condition, then increase the total amount of the first hydrogen.

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