Integrated energy control method for electricity-hydrogen-ammonia integrated microgrid system, and device

Abstract

Disclosed in the present application are an integrated energy control method for an electricity-hydrogen-ammonia integrated microgrid system, and a device. The microgrid system comprises a direct-current busbar, an energy router, a photovoltaic power generation system, a hydrogen fuel cell system, an electrochemical energy storage system, and a new energy load consisting of a water electrolysis hydrogen production system, an ammonia cracking hydrogen production system and a hydrogen storage system, wherein the direct-current busbar is connected to an external alternating-current busbar by means of the energy router, and the ammonia cracking hydrogen production system and the hydrogen storage system are connected to the external alternating-current busbar. The method comprises: acquiring an actual output curve of a photovoltaic power generation system in the current measurement period and a planned output power of a new energy load at the current moment, so as to determine an energy deviation; when the energy deviation is less than zero, using a first planned output power, which is determined on the basis of the actual output curve, to perform discharging control on a microgrid system; and when the energy deviation is greater than zero, using the planned output power to perform charging control on the microgrid system. The present application can improve the output stability of the photovoltaic power generation system.

Description

A comprehensive energy control method and device for a micro-grid system integrating electricity, hydrogen and ammonia TECHNICAL FIELD

[0001] The present application relates to the technical field of micro-grid, in particular to a comprehensive energy control method and device for a micro-grid system integrating electricity, hydrogen and ammonia. BACKGROUND

[0002] In a micro-grid system, the cooperation of a photovoltaic power generation system and a related energy storage system can solve the problem of unstable output of the photovoltaic power generation system to some extent. However, when the actual output power of the photovoltaic power generation system is less than the planned output power for new energy load, the related energy storage system is difficult to discharge for a long time due to its limited storage capacity, resulting in the difficulty of stable output of the photovoltaic power generation system.

[0003] SUMMARY

[0004] The present application provides a comprehensive energy control method and device for a micro-grid system integrating electricity, hydrogen and ammonia to solve one or more technical problems existing in the prior art and at least provide a beneficial choice or create conditions.

[0005] In a first aspect, a comprehensive energy control method for a micro-grid system integrating electricity, hydrogen and ammonia is provided. The micro-grid system includes a DC bus, an energy router, an ammonia cracking hydrogen production system, a hydrogen storage system, a photovoltaic power generation system, a water electrolysis hydrogen production system, a hydrogen fuel cell system and an electrochemical energy storage system connected to the DC bus through the energy router. The DC bus is connected to an external AC bus through the energy router. The ammonia cracking hydrogen production system and the hydrogen storage system are connected to the external AC bus. The ammonia cracking hydrogen production system and the water electrolysis hydrogen production system are connected to the hydrogen storage system. The hydrogen storage system is connected to the hydrogen fuel cell system. The water electrolysis hydrogen production system, the ammonia cracking hydrogen production system and the hydrogen storage system constitute a new energy load. The method comprises:

[0006] Obtaining an actual output curve of the photovoltaic power generation system in a current measurement period and a planned output power of the new energy load at a current time to determine an electricity deviation;

[0007] When the electricity deviation is less than zero, a first planned output power is determined according to the actual output curve, and the micro-grid system is discharged by using the first planned output power;

[0008] When the electricity deviation is greater than zero, the micro-grid system is charged by using the planned output power.

[0009] Further, the discharging of the micro-grid system by using the first planned output power comprises:

[0010] Step 11: Obtain the SOC value of the electrochemical energy storage system and record it as SOC(t), and determine whether the SOC requirement is met. min ≤SOC(t)≤SOC max Or SOC(t) > SOC max Among them (SOC) min SOC max If the value is within the normal SOC range of the electrochemical energy storage system, proceed to step 13; otherwise, proceed to step 12.

[0011] Step 12: Obtain the SOH value of the hydrogen storage system and record it as SOH(t), and determine whether the SOH requirement is met. min ≤SOH(t)≤SOH max Or SOH(t)>SOH max , of which (SOH min SOH max If the SOH range is within the normal range of the hydrogen storage system, then control the hydrogen fuel cell system to charge the electrochemical energy storage system and proceed to step 13; otherwise, control the water electrolysis hydrogen production system or the ammonia cracking hydrogen production system to supply hydrogen to the hydrogen storage system and return to step 11.

[0012] Step 13: Control the electrochemical energy storage system to discharge, then determine the first power to be compensated for the microgrid system based on the first planned output power, and execute step 14 if the first power to be compensated is less than zero;

[0013] Step 14: Control the hydrogen fuel cell system to generate electricity, then determine the second power to be supplemented by the microgrid system based on the first planned output power, and if the second power to be supplemented is less than zero, execute step 15;

[0014] Step 15: Determine the third power to be supplemented for the microgrid system based on the first planned output power, and then use the third power to be supplemented to control the microgrid system to draw power from the external AC bus.

[0015] Furthermore, the first power to be compensated is determined in the following way:

[0016] The current operating power of the photovoltaic power generation system and the current operating power of the electrochemical energy storage system are obtained to determine the first total operating power, and the difference between the first total operating power and the first planned output power is taken as the first power to be supplemented.

[0017] Furthermore, the second power to be compensated is determined in the following manner:

[0018] The current operating power of the photovoltaic power generation system, the current operating power of the electrochemical energy storage system, and the current operating power of the hydrogen fuel cell system are obtained to determine the second total operating power. The difference between the second total operating power and the first planned output power is then used as the second power to be supplemented.

[0019] Furthermore, the third power to be compensated is determined in the following manner:

[0020] The current operating power of the photovoltaic power generation system, the current operating power of the electrochemical energy storage system, and the current operating power of the hydrogen fuel cell system are obtained to determine the third total operating power. The difference between the first planned output power and the third total operating power is then used as the third power to be supplemented.

[0021] Furthermore, the charging control of the microgrid system using the planned output power includes:

[0022] Step 21: Obtain the SOC value of the electrochemical energy storage system and record it as SOC(t), and determine whether the SOC requirement is met. min ≤SOC(t)≤SOC max Or SOC(t) > SOC max Among them (SOC) min SOC max If the value is within the normal SOC range of the electrochemical energy storage system, proceed to step 22; otherwise, proceed to step 23.

[0023] Step 22: Control the electrochemical energy storage system to charge, then determine the first power to be discharged of the microgrid system according to the planned output power, and execute step 23 if the first power to be discharged is less than zero;

[0024] Step 23: Determine the second power to be discharged by the microgrid system based on the planned output power, and then use the second power to discharge to control the microgrid system to feed back electrical energy to the external AC bus.

[0025] Furthermore, the first power to be amplified is determined in the following way:

[0026] The current operating power of the photovoltaic power generation system and the current operating power of the electrochemical energy storage system are obtained to determine the fourth total operating power, and the difference between the fourth total operating power and the planned output power is taken as the first power to be discharged.

[0027] Furthermore, the second power to be amplified is determined in the following manner:

[0028] The current operating power of the photovoltaic power generation system and the current operating power of the electrochemical energy storage system are obtained to determine the fifth total operating power, and the difference between the planned output power and the fifth total operating power is used as the second power to be discharged.

[0029] Furthermore, the method also includes: maintaining the operating state of the microgrid system unchanged when the power deviation is equal to zero.

[0030] In a second aspect, a computer device is provided, including a memory and a processor, wherein a computer program is stored on the memory, and the processor executes the computer program to implement the integrated energy control method for a microgrid system integrating electricity, hydrogen, and ammonia as described in the first aspect.

[0031] This application has at least the following beneficial effects: Considering the limited storage capacity of the energy storage systems included in the microgrid system, the planned output power of the renewable energy load is adaptively adjusted based on the power deviation between the actual output power of the photovoltaic power generation system and the planned output power of the renewable energy load. At the same time, by combining the SOC value of the electrochemical energy storage system and the SOH value of the hydrogen storage system, and by dynamically adjusting the charging and discharging state of the electrochemical energy storage system and the operating state of the renewable energy load, the output stability of the photovoltaic power generation system can be effectively improved, thereby maintaining the power balance of the microgrid system. Attached Figure Description

[0032] The accompanying drawings are used to provide a further understanding of the technical solutions of this application and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of this application and do not constitute a limitation on the technical solutions of this application.

[0033] Figure 1 is a schematic diagram of the composition of a microgrid system integrating electricity, hydrogen, and ammonia in an embodiment of this application;

[0034] Figure 2 is a flowchart illustrating a comprehensive energy control method for a microgrid system integrating electricity, hydrogen, and ammonia in an embodiment of this application.

[0035] Figure 3 is a schematic diagram of the hardware structure of the computer device in an embodiment of this application. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0037] It should be noted that although a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than that shown in the flowchart. The terms "first," "second," etc., in the specification, claims, and the foregoing drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0039] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0040] The flowchart shown in the attached figures is merely illustrative and does not necessarily include all content and operations / steps, nor does it require them to be performed in the described order. For example, some operations / steps may be broken down, while others may be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0041] Please refer to Figure 1. Figure 1 is a schematic diagram of the composition of a microgrid system integrating hydrogen and ammonia provided in an embodiment of this application. The microgrid system includes an energy router, a DC bus, a hydrogen storage system, an ammonia cracking hydrogen production system, a water electrolysis hydrogen production system, a photovoltaic power generation system, an electrochemical energy storage system, and a hydrogen fuel cell system. The hydrogen storage system, the ammonia cracking hydrogen production system, and the water electrolysis hydrogen production system constitute a new energy load.

[0042] Basically, the water electrolysis hydrogen production system is connected to the DC bus via the energy router, the photovoltaic power generation system is connected to the DC bus via the energy router, the electrochemical energy storage system is connected to the DC bus via the energy router, the hydrogen fuel cell system is connected to the DC bus via the energy router, the DC bus is connected to an external AC bus via the energy router, the ammonia cracking hydrogen production system is connected to the external AC bus, the hydrogen storage system is connected to the external AC bus, the ammonia cracking hydrogen production system is connected to the hydrogen storage system, the water electrolysis hydrogen production system is connected to the hydrogen storage system, and the hydrogen storage system is connected to the hydrogen fuel cell system.

[0043] More specifically, the energy router includes a first DC / DC converter, a second DC / DC converter, a third DC / DC converter, a bidirectional DC / DC converter, and a bidirectional DC / AC converter. The photovoltaic power generation system is connected to the DC bus via the first DC / DC converter, the water electrolysis hydrogen production system is connected to the DC bus via the second DC / DC converter, the hydrogen fuel cell system is connected to the DC bus via the third DC / DC converter, the electrochemical energy storage system is connected to the DC bus via the bidirectional DC / DC converter, and the DC bus is connected to the external AC bus via the bidirectional DC / AC converter. The energy router can achieve electrical isolation, voltage conversion, and bidirectional flow of electrical energy, providing a standardized "plug-and-play" interface for different levels and forms of source loads, and can adjust the voltage and current of each converter in real time.

[0044] In practical applications, the photovoltaic power generation system uses the photovoltaic effect to convert the solar energy it captures into electrical energy. This electrical energy is then processed by the first DC / DC converter and directly connected to the DC bus, thereby providing power to the water electrolysis hydrogen production system and storing it through the electrochemical energy storage system.

[0045] The electrical energy provided by the DC bus is converted to the voltage level by the second DC / DC converter to power the water electrolysis hydrogen production system for consumption. The hydrogen produced by the water electrolysis hydrogen production system during operation will be stored in the hydrogen storage system, and the hydrogen produced by the ammonia cracking hydrogen production system during operation will also be stored in the hydrogen storage system. Both the hydrogen storage system and the ammonia cracking hydrogen production system are powered by the external AC bus.

[0046] The hydrogen fuel cell system can convert the hydrogen stored in the hydrogen storage system into electrical energy, and then convert the electrical energy into voltage level via the third DC / DC converter before connecting it to the DC bus for compensation.

[0047] The electrical energy supplied by the DC bus is converted to a higher voltage level by the bidirectional DC / DC converter and then input into the electrochemical energy storage system for storage and consumption; conversely, the electrochemical energy storage system converts the stored electrical energy to a higher voltage level by the bidirectional DC / DC converter and then feeds it into the DC bus for compensation.

[0048] The bidirectional DC / AC converter can be understood as a grid connection port, used to realize the AC / DC conversion and bidirectional flow of electrical energy between the DC bus and the external AC bus.

[0049] In this embodiment, a lithium battery is preferably used as the energy storage unit of the electrochemical energy storage system, and its mathematical model is as follows:

[0050] The ratio of the remaining capacity of the lithium battery to its maximum capacity is defined as the State of Charge (SOC) value of the electrochemical energy storage system. This value reflects the actual availability of the lithium battery (i.e., how long it can currently provide power), and can be calculated using the following mathematical expression:

[0051] In the formula, when the lithium battery is in a charging state, U BAT (t) represents the input voltage of the lithium battery, I BAT (t) represents the input current of the lithium battery. When the lithium battery is in a discharging state, U BAT (t) is the output voltage of the lithium battery, I BAT (t) represents the output current of the lithium battery, E0 is the voltage constant of the lithium battery, and K e Let I be the polarization constant of the lithium battery, Q be the maximum capacity of the lithium battery, and I be the maximum capacity of the lithium battery. t I represents the extractable electrical energy of the lithium battery. * A is the low-frequency dynamic current of the lithium battery. b Let B be the amplitude in the exponential region, B be the time inverse ratio in the exponential region, and R be the amplitude in the exponential region. res R is the polarization resistance of the lithium battery. b Let SOC(t) be the internal resistance of the lithium battery, and SOC(t) be the SOC value of the electrochemical energy storage system at time t. When SOC(t) = 0, it means that the lithium battery is fully discharged, and when SOC(t) = 1, it means that the lithium battery is fully charged.

[0052] In this embodiment, a hydrogen storage tank is preferably used as the energy storage unit of the hydrogen storage system. The ratio of the maximum internal pressure of the hydrogen storage system to the total internal pressure of the hydrogen storage system is defined as the SOH value of the hydrogen storage system, which can be calculated using the following mathematical expression:

[0053] In the formula, SOH(t) is the SOH value of the hydrogen storage system at time t, and P ST (t) represents the internal pressure of the hydrogen storage system at time t, P STmax The maximum internal pressure of the hydrogen storage system is m. ST (t) represents the hydrogen storage capacity of the hydrogen storage system at time t, R is the gas constant, and T is the hydrogen storage capacity of the system. ST (t) represents the internal gas thermodynamic temperature of the hydrogen storage system at time t, V ST Let m be the geometric volume of the hydrogen storage system. ST (t-1) represents the hydrogen storage capacity of the hydrogen storage system at time t-1, v STin (t) represents the hydrogen charging rate of the hydrogen storage system at time t, v STout (t) represents the hydrogen release rate of the hydrogen storage system at time t.

[0054] It should be noted that the microgrid system can be configured in industrial parks, residential communities, isolated power supply sites and backup sites, or other locations.

[0055] In the microgrid system, the photovoltaic (PV) power generation system, as a new energy application, exhibits significant uncertainties. Influenced by factors such as weather and temperature, its predicted and actual power outputs can deviate unpredictably. Therefore, there may be a discrepancy between the planned power output for the new energy load and the actual power output of the PV system. When the actual power output exceeds the planned output, the PV system can meet the original plan for normal operation. However, when the actual power output is less than the planned output, to ensure the stability of the PV system's output, the stored energy from the energy storage system within the microgrid needs to be utilized for regulation. But when this stored energy is depleted, the actual power output provided by the PV system after grid connection cannot be guaranteed to be stable, thus affecting the stable operation of the power grid. To ensure stable power output from the PV system, adaptive adjustments need to be made to the planned power output of the new energy load, and corresponding charge and discharge control measures need to be implemented in the microgrid system.

[0056] Based on this, Figure 2 is a flowchart illustrating a comprehensive energy control method for a microgrid system integrating electricity, hydrogen, and ammonia, provided in an embodiment of this application. The method includes the following:

[0057] Step S110: Obtain the actual output curve of the photovoltaic power generation system in the current measurement period and the planned output power of the new energy load at the current moment to determine the power deviation;

[0058] Step S120: Determine whether the power deviation is equal to zero; if yes, proceed to step S160; if no, proceed to step S130.

[0059] Step S130: Determine whether the power deviation is less than zero; if yes, proceed to step S140; if no, proceed to step S150.

[0060] Step S140: Determine the first planned output power based on the actual output curve, and then use the first planned output power to perform discharge control on the microgrid system;

[0061] Step S150: Use the planned output power to perform charging control on the microgrid system;

[0062] Step S160: Keep the operating state of the microgrid system unchanged.

[0063] In this embodiment of the application, the power deviation mentioned in step S110 above can be calculated using the following mathematical expression:

[0064] In the formula, △Q(t) represents the electrical deviation, T represents the current measurement cycle, and P represents the current measurement cycle. f P0(t) is the actual output curve of the photovoltaic power generation system, and P0(t) is the planned output power of the new energy load.

[0065] In this embodiment of the application, the implementation process of step S140 includes, but is not limited to, the following:

[0066] Step S141: Based on the actual output curve, the first planned output power is calculated using the following mathematical expression:

[0067] In the formula, P HN (t) represents the first planned output power, T is the current measurement cycle, and P... f (t) represents the actual output curve of the photovoltaic power generation system;

[0068] Step S142: Obtain the SOC value of the electrochemical energy storage system and record it as SOC(t), then determine whether it meets the SOC requirement. min ≤SOC(t)≤SOC max Or SOC(t) > SOC max If the condition is met, proceed to step S144; otherwise (i.e., SOC(t) is not met). <SOC min If the condition is met, then proceed to step S143;

[0069] Among them, (SOC) min SOC maxThe SOC range of the electrochemical energy storage system is defined as follows: Considering the operating life and performance of the electrochemical energy storage system, a minimum SOC limit is preferably set at SOC. min =0.2 and the maximum SOC limit is SOC max =0.8;

[0070] Step S143: Obtain the SOH value of the hydrogen storage system and record it as SOH(t), then determine whether it meets the SOH requirement. min ≤SOH(t)≤SOH max Or SOH(t) > SOH max conditions;

[0071] If the conditions are met, the hydrogen fuel cell system is controlled to charge the electrochemical energy storage system (i.e., the hydrogen fuel cell system is controlled to discharge to the DC bus to provide electrical energy, and then the DC bus is controlled to transfer the electrical energy to the electrochemical energy storage system for charging), until the SOC value of the electrochemical energy storage system gradually rises to k. T (SOC min +SOC max Then proceed to step S144;

[0072] If it does not meet the requirements (i.e., SOH(t)...) <SOH min If the ammonia cracking hydrogen production system or the water electrolysis hydrogen production system is controlled to supply hydrogen to the hydrogen storage system, the SO4 value of the hydrogen storage system will gradually rise to (SO4). min SOH max Within the range, return to execute step S142 above;

[0073] Among them, (SOH) min SOH max The normal SOH range of the hydrogen storage system is defined as follows. Considering the service life and performance of the hydrogen storage system, a minimum SOH limit is preferably set at SOH. min =0.2 and the maximum SOH limit is SOH max =0.8; k T For the adjustment coefficient, it is preferable to set its value range to 0.5 to 0.7;

[0074] Step S144: Control the electrochemical energy storage system to discharge, then determine the first power to be supplemented in the microgrid system based on the first planned output power, and determine whether the first power to be supplemented is greater than or equal to zero; if yes, it means that the current comprehensive energy of the microgrid system has reached a balanced state, and at this time control the electrochemical energy storage system to stop discharging; if no, proceed to step S145.

[0075] The method for determining the first power to be supplemented is explained as follows: the current operating power (i.e., current power generation) of the photovoltaic power generation system and the current operating power (i.e., current power discharge) of the electrochemical energy storage system are obtained and their sum is defined as the first total operating power. The difference between the first total operating power and the first planned output power is defined as the first power to be supplemented.

[0076] Step S145: Control the hydrogen fuel cell system to generate electricity, then determine the second power to be supplemented by the microgrid system based on the first planned output power, and determine whether the second power to be supplemented is greater than or equal to zero; if yes, it means that the current comprehensive energy of the microgrid system has reached a balanced state, and at this time control the hydrogen fuel cell system to stop generating electricity; if no, proceed to step S146.

[0077] The method for determining the second power to be supplemented is explained as follows: the current operating power (i.e., current power generation) of the photovoltaic power generation system, the current operating power (i.e., current power discharge) of the electrochemical energy storage system, and the current operating power (i.e., current power generation) of the hydrogen fuel cell system are obtained, and their sum is defined as the second total operating power. The difference between the second total operating power and the first planned output power is defined as the second power to be supplemented.

[0078] Step S146: Determine the third power to be supplemented for the microgrid system based on the first planned output power, and then control the microgrid system to draw power from the external AC bus using the third power to be supplemented;

[0079] The method for determining the third power to be supplemented is explained as follows: the current operating power (i.e., current power generation) of the photovoltaic power generation system, the current operating power (i.e., current power discharge) of the electrochemical energy storage system, and the current operating power (i.e., current power generation) of the hydrogen fuel cell system are obtained, and their sum is defined as the third total operating power. The difference between the first planned output power and the third total operating power is defined as the third power to be supplemented.

[0080] In this embodiment of the application, the implementation process of step S150 includes, but is not limited to, the following:

[0081] Step S151: Obtain the SOC value of the electrochemical energy storage system and record it as SOC(t), then determine whether it meets the SOC requirement. min ≤SOC(t)≤SOC max Or SOC(t) > SOC max If the condition is met, proceed to step S152; otherwise (i.e., SOC(t) is not met). <SOC minIf the condition is met, then proceed to step S153;

[0082] Among them, (SOC) min SOC max The SOC range of the electrochemical energy storage system is defined as follows: Considering the operating life and performance of the electrochemical energy storage system, a minimum SOC limit is preferably set at SOC. min =0.2 and the maximum SOC limit is SOC max =0.8;

[0083] Step S152: Control the electrochemical energy storage system to charge, then determine the first power to be discharged of the microgrid system based on the planned output power, and determine whether the first power to be discharged is greater than or equal to zero; if yes, it means that the current comprehensive energy of the microgrid system has reached a balanced state, and at this time control the electrochemical energy storage system to stop charging; if no, proceed to step S153.

[0084] The method for determining the first power to be released is explained as follows: the current operating power (i.e., current power generation power) of the photovoltaic power generation system and the current operating power (i.e., current charging power) of the electrochemical energy storage system are obtained and their sum is defined as the fourth total operating power. The difference between the fourth total operating power and the planned output power is defined as the first power to be released.

[0085] Step S153: Determine the second power to be released by the microgrid system based on the planned output power, and then control the microgrid system to feed back electrical energy to the external AC bus with the second power to be released;

[0086] The method for determining the second power to be released is explained as follows: the current operating power (i.e., current power generation) of the photovoltaic power generation system and the current operating power (i.e., current charging power) of the electrochemical energy storage system are obtained and their sum is defined as the fifth total operating power. The difference between the planned output power and the fifth total operating power is defined as the second power to be released.

[0087] In this embodiment, considering the limited storage capacity of the energy storage systems included in the microgrid system, the planned output power of the renewable energy load is adaptively adjusted based on the power deviation between the actual output power of the photovoltaic power generation system and the planned output power of the renewable energy load. At the same time, by combining the SOC value of the electrochemical energy storage system and the SOH value of the hydrogen storage system, and by dynamically adjusting the charging and discharging state of the electrochemical energy storage system and the operating state of the renewable energy load, the output stability of the photovoltaic power generation system can be effectively improved, thereby maintaining the power balance of the microgrid system.

[0088] Furthermore, this application embodiment also provides a computer-readable storage medium storing a computer program. When executed by a processor, the computer program implements a comprehensive energy control method for a microgrid system integrating electricity, hydrogen, and ammonia as described in the above embodiments. The computer-readable storage medium includes, but is not limited to, any type of disk (including floppy disks, hard disks, optical disks, CD-ROMs, and magneto-optical disks), ROM (Read-Only Memory), RAM (Random Access Memory), EPROM (Erasable Programmable Read-Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory), flash memory, magnetic cards, or optical cards. In other words, the storage device includes any medium on which a device (e.g., a computer, mobile phone, etc.) stores or transmits information in a readable form, and can be a read-only memory, a disk, or an optical disk, etc.

[0089] Furthermore, Figure 3 is a schematic diagram of the hardware structure of a computer device provided in an embodiment of this application. The computer device includes a processor 220, a memory 230, an input unit 240, and a display unit 250, among other devices. Those skilled in the art will understand that the device structure shown in Figure 3 does not constitute a limitation on all devices and may include more or fewer components than shown, or combine certain components. The memory 230 can be used to store the computer program 210 and various functional modules. The processor 220 runs the computer program 210 stored in the memory 230, thereby executing various functional applications and data processing of the device. The memory can be internal memory or external memory, or include both internal and external memory. Internal memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), flash memory, or random access memory. External memory may include hard disks, floppy disks, USB flash drives, magnetic tapes, etc. The memory 230 disclosed in the embodiments of this application includes, but is not limited to, these types of memory. The memory 230 disclosed in the embodiments of this application is only an example and not a limitation.

[0090] Input unit 240 is used to receive signal input and user-input keywords. Input unit 240 may include a touch panel and other input devices. The touch panel can collect user touch operations on or near it (such as operations performed by the user using a finger, stylus, or any suitable object or accessory on or near the touch panel) and drive the corresponding connection device according to a pre-set program; other input devices may include, but are not limited to, one or more of physical keyboards, function keys (such as play control buttons, power buttons, etc.), trackballs, mice, joysticks, etc. Display unit 250 can be used to display user-input information or information provided to the user, as well as various menus of the terminal device. Display unit 250 may be in the form of a liquid crystal display, organic light-emitting diode, etc. Processor 220 is the control center of the terminal device, connecting various parts of the entire device through various interfaces and lines, performing various functions and processing data by running or executing software programs and / or modules stored in memory 230, and calling data stored in memory 230.

[0091] As one embodiment, the computer device includes a processor 220, a memory 230, and a computer program 210, wherein the computer program 210 is stored in the memory 230 and configured to be executed by the processor 220, and the computer program 210 is configured to execute an integrated energy control method for a microgrid system integrating electricity, hydrogen, and ammonia as described in the above embodiment.

[0092] The terms “comprising” and “having”, and any variations thereof, in the specification and accompanying drawings of this application are intended to cover non-exclusive inclusion, such that a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that are expressly listed, but may include other steps or units that are not expressly listed or that are inherent to such process, method, product, or apparatus.

[0093] In this application, it should be understood that "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0094] Although the description of this application has been quite detailed and particularly focused on several of the described embodiments, it is not intended to limit itself to any of these details or embodiments or any particular embodiment. Rather, it should be considered as effectively covering the intended scope of this application by referring to the appended claims and taking into account the broad possible interpretations of these claims provided by the prior art. Furthermore, the foregoing description of this application with respect to embodiments foreseeable by the inventors is intended to provide a useful description, and non-substantial modifications to this application that have not yet been foreseen may still represent equivalent modifications.

Claims

1. A method for integrated energy control of a hybrid hydrogen-ammonia microgrid system, the microgrid system comprising a DC bus, an energy router, an ammonia cracking hydrogen production system, a hydrogen storage system, a photovoltaic power generation system, a water electrolysis hydrogen production system, a hydrogen fuel cell system and an electrochemical energy storage system connected to the DC bus through the energy router, the DC bus being connected to an external AC bus through the energy router, the ammonia cracking hydrogen production system and the hydrogen storage system being connected to the external AC bus, the ammonia cracking hydrogen production system and the water electrolysis hydrogen production system being connected to the hydrogen storage system, the hydrogen storage system being connected to the hydrogen fuel cell system, the water electrolysis hydrogen production system, the ammonia cracking hydrogen production system and the hydrogen storage system constituting a new energy load; the method comprising: obtaining an actual output curve of the photovoltaic power generation system in a current measurement period and a planned output power of the new energy load at a current time to determine an electricity deviation; when the electricity deviation is less than zero, determining a first planned output power according to the actual output curve, and then discharging the microgrid system using the first planned output power; and when the electricity deviation is greater than zero, charging the microgrid system using the planned output power. The discharging of the microgrid system using the first planned output power comprises: step 13, discharging the electrochemical energy storage system, then determining a first power to be supplied of the microgrid system according to the first planned output power, and executing step 14 when the first power to be supplied is less than zero; step 14, generating electricity by the hydrogen fuel cell system, then determining a second power to be supplied of the microgrid system according to the first planned output power, and executing step 15 when the second power to be supplied is less than zero; and step 15, determining a third power to be supplied of the microgrid system according to the first planned output power, and then controlling the microgrid system to take electricity from the external AC bus using the third power to be supplied. The first power to be supplied is determined by: obtaining a current operating power of the photovoltaic power generation system and a current operating power of the electrochemical energy storage system to determine a first total operating power, and then taking a difference between the first total operating power and the first planned output power as the first power to be supplied. The second power to be supplied is determined by: obtaining the current operating power of the photovoltaic power generation system, the current operating power of the electrochemical energy storage system and a current operating power of the hydrogen fuel cell system to determine a second total operating power, and then taking a difference between the second total operating power and the first planned output power as the second power to be supplied.

2. The integrated energy control method of the hybrid microgrid system of power-to-hydrogen-to-ammonia according to claim 1, wherein, The third power to be supplied is determined by: obtaining the current operating power of the photovoltaic power generation system, the current operating power of the electrochemical energy storage system and the current operating power of the hydrogen fuel cell system to determine a third total operating power, and then taking a difference between the first planned output power and the third total operating power as the third power to be supplied. Step 11, obtain the SOC value of the electrochemical energy storage system and record it as SOC(t), determine whether the following condition is met: SOC min ≤ SOC(t) ≤ SOC max or SOC(t) > SOC max , wherein (SOC min , SOC max ) is the normal SOC range of the electrochemical energy storage system; if yes, execute Step 13; if no, execute Step 12; Step 12, obtaining the SOH value of the hydrogen storage system and recording it as SOH(t), judging whether the following condition is met: SOH min ≤ SOH(t) ≤ SOH max or SOH(t) > SOH max , wherein (SOH min , SOH max ) is the normal SOH range of the hydrogen storage system; if yes, controlling the hydrogen fuel cell system to charge the electrochemical energy storage system, and then executing Step 13; if no, controlling the water electrolysis hydrogen production system or the ammonia cracking hydrogen production system to supply hydrogen to the hydrogen storage system, and then returning to execute Step 11; ​ ​ ​ 3. The integrated energy control method of the hybrid microgrid system of power-to-hydrogen-to-ammonia according to claim 2, wherein, ​ ​ 4. The integrated energy control method of the hybrid microgrid system of power-to-hydrogen-to-ammonia according to claim 2, wherein, ​ ​ 5. The integrated energy control method of the hybrid power hydrogen-ammonia microgrid system according to claim 2, wherein, ​ ​ 6. The integrated energy control method of the hybrid power hydrogen-ammonia microgrid system according to claim 1, wherein, The charging control of the micro-grid system by the planned output power comprises: Step 21, obtain the SOC value of the electrochemical energy storage system and record it as SOC(t), determine whether the following condition is met: SOC min ≤ SOC(t) ≤ SOC max or SOC(t) > SOC max , wherein (SOC min , SOC max ) is the normal SOC range of the electrochemical energy storage system; if yes, execute Step 22; if no, execute Step 23; Step 22, controlling the electrochemical energy storage system to charge, and determining a first discharging power of the micro-grid system according to the planned output power, and if the first discharging power is less than zero, executing step 23; Step 23, determining a second discharging power of the micro-grid system according to the planned output power, and controlling the micro-grid system to feedback power to the external AC bus by the second discharging power.

7. The integrated energy control method of the hybrid microgrid system of power-to-hydrogen-to-ammonia according to claim 6, wherein, The first discharging power is determined by: obtaining the current operating power of the photovoltaic power generation system and the current operating power of the electrochemical energy storage system to determine a fourth total operating power, and taking the difference between the fourth total operating power and the planned output power as the first discharging power.

8. The integrated energy control method of the hybrid microgrid system of power-to-hydrogen-to-ammonia according to claim 6, wherein, The second discharging power is determined by: obtaining the current operating power of the photovoltaic power generation system and the current operating power of the electrochemical energy storage system to determine a fifth total operating power, and taking the difference between the planned output power and the fifth total operating power as the second discharging power. The method further comprises: when the power deviation is equal to zero, keeping the operating state of the micro-grid system unchanged.

9. The integrated energy control method of the hybrid microgrid system of power-to- hydrogen-to-ammonia according to claim 1, wherein, 10. A computer device comprising a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to realize the integrated energy control method of the micro-grid system of the fusion of electricity, hydrogen and ammonia according to any one of claims 1 to 9. ​

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