Method for coupling molten salt-thermal electrochemical cell energy storage to assist steam supply and frequency modulation peak shaving operation

Abstract

The embodiment of the present disclosure provides a molten salt-thermochemical battery coupling energy storage auxiliary steam supply and frequency modulation peak regulation operation method, comprising: obtaining power grid dispatching information, steam supply demand information and energy storage state information; based on the power grid dispatching information, the steam supply demand information and the energy storage state information, a cooperative control strategy is generated; according to the cooperative control strategy, the molten salt heat storage system and the multi-reactor thermochemical energy storage system are controlled to perform corresponding energy storage and release operations; wherein the heat storage process and the heat release process of the molten salt heat storage system are configured to be independently controlled, the multi-reactor thermochemical energy storage system comprises at least three independently controllable reactors, and the cooperative control strategy is used for planning the operation mode of the molten salt heat storage system and assigning the energy storage, energy release or standby state of each reactor in the multi-reactor thermochemical energy storage system.

Description

Technical Field

[0001] The embodiments disclosed herein belong to the field of energy storage technology, specifically relating to a method, system, computer equipment, and storage medium for molten salt-thermochemical battery coupled energy storage to assist safe steam supply and frequency regulation / peak shaving operation of coal-fired power units. Background Technology

[0002] While the installed capacity of new energy sources, represented by wind and solar power, continues to grow rapidly, their output exhibits significant randomness, volatility, and intermittency, leading to increasing pressure on power system peak regulation and persistent "wind and solar curtailment" problems. Simultaneously, traditional power systems, centered on electricity, lack energy storage capabilities with large-scale, long-term regulation, hindering cross-period energy transfer and multi-energy synergy utilization. This has become a significant bottleneck restricting the high-proportion consumption of new energy sources. Therefore, developing energy storage technologies that combine large capacity, low cost, and long-term energy storage characteristics, and promoting their coordinated operation with conventional power sources, has become a key path for building a new type of power system.

[0003] Coal-fired power units, as a crucial supporting power source in the current power system, possess stable energy supply capabilities. However, due to the strong coupling characteristics of the boiler-turbine system, their peak-shaving and frequency regulation capabilities, as well as steam supply flexibility, are somewhat limited. Introducing energy storage systems to achieve thermoelectric decoupling is an important technological direction for improving the flexibility of coal-fired power units. Among these technologies, electric heating molten salt energy storage possesses the operational characteristic of "storage and release on demand," enabling the absorption of electrical energy and its conversion into heat energy during periods of low electricity prices, while simultaneously providing continuous steam supply through heat exchange. In contrast, thermochemical energy storage systems offer advantages such as high energy density and long storage periods. However, limited by their reaction mechanisms, the requirements for temperature, water vapor partial pressure, and reactant states differ significantly during energy storage (endothermic) and energy release (exothermic) processes. A single reactor cannot simultaneously achieve both energy storage and energy release processes, thus lacking the "storage and release on demand" capability.

[0004] Existing technologies are mostly focused on single energy storage systems or simple coupling methods, lacking in-depth research on the coordinated control of two different types of energy storage systems: molten salt thermal energy storage and thermochemical energy storage. In particular, there are still significant deficiencies in multi-mode switching, dynamic scheduling, and economic optimization.

[0005] Therefore, it is necessary to propose a collaborative operation optimization method oriented towards multiple constraints, so as to realize the complementary advantages of multiple energy storage systems and improve the flexible adjustment capability and operating economy of coal-fired units under complex electrothermal coupling conditions. Summary of the Invention

[0006] The embodiments disclosed herein aim to at least solve one of the technical problems existing in the prior art, and provide a method, system, computer equipment and storage medium for molten salt-thermal chemical battery coupled energy storage to assist safe steam supply and frequency regulation and peak shaving operation of coal-fired power units.

[0007] A first aspect of the embodiments of this disclosure provides a method for molten salt-thermochemical battery coupled energy storage to assist in steam supply and frequency regulation / peak shaving operation, comprising: The system acquires grid dispatch information, steam demand information, and energy storage status information. The energy storage status information includes one or more of the following: heat storage capacity, heat storage power, and remaining heat storage capacity of the molten salt thermal energy storage system; and one or more of the following: heat storage capacity, reaction conversion rate, temperature level, and remaining heat storage capacity of the thermochemical energy storage system. Based on the power grid dispatch information, the steam supply demand information, and the energy storage status information, a collaborative control strategy is generated. Based on the aforementioned collaborative control strategy, the molten salt thermal energy storage system and the multi-reactor thermochemical energy storage system are controlled to perform corresponding energy storage and release operations; The heat storage and heat release processes of the molten salt thermal energy storage system are configured to be independently controlled. The multi-reactor thermochemical energy storage system includes at least three independently controllable reactors. The collaborative control strategy is used to plan the operation mode of the molten salt thermal energy storage system and to allocate energy storage, energy release, or standby states to each reactor in the multi-reactor thermochemical energy storage system.

[0008] Optionally, generating a coordinated control strategy based on the grid dispatch information, the steam demand information, and the energy storage status information includes: Based on the electricity price signal in the power grid dispatch information, an initial operating mode is generated. The initial operating mode is used to specify the number of reactors in the multi-reactor thermochemical energy storage system that are in the energy storage state and the energy release state. Based on the steam supply demand information, the initial operating mode is modified for the first time to adjust the number of reactors in the energy release state. Based on the energy storage status information, the operating mode after the first correction is corrected a second time, and the energy storage and release power of the molten salt thermal energy storage system is determined to compensate for or coordinate with the operation of the thermochemical energy storage system.

[0009] Optionally, generating the initial operating mode based on the electricity price signal in the power grid dispatch information includes: When the electricity price signal indicates that it is currently a low electricity price period, the initial operating mode is configured to prioritize increasing the number of reactors in energy storage mode; When the electricity price signal indicates that the current period is a high electricity price period, the initial operating mode is configured to prioritize increasing the number of reactors in the energy release state.

[0010] Optionally, the first correction of the initial operating mode based on the steam supply demand information includes: During periods of low electricity prices, when the steam demand exceeds a preset threshold, the initial operating mode is modified to maintain at least one reactor in an energy release state. During periods of high electricity prices, when the steam demand exceeds a preset threshold, the initial operating mode is modified to maintain at least two reactors in an energy release state.

[0011] Optionally, the states assigned to each reactor in the multi-reactor thermochemical energy storage system can be combined to form a variety of predetermined operating modes, including three-discharge mode, three-storage mode, two-storage-one-discharge mode, one-storage-two-discharge mode, and one-storage-one-discharge-one-standby mode. When the predetermined operating mode is the three-release mode, all reactors are in the energy release state; When the predetermined operating mode is the three-storage mode, all reactors are in an energy storage state; When the predetermined operating mode is the two-storage-one-release mode, two reactors are in the energy storage state and one reactor is in the energy release state. When the predetermined operating mode is a one-storage-two-release mode, one reactor is in the energy storage state and the two reactors are in the energy release state. When the predetermined operating mode is a one-storage-one-release-standby mode, one reactor is in the energy storage state, one reactor is in the energy release state, and one reactor is in the standby state.

[0012] Optionally, the collaborative control strategy further includes: when it is necessary to extend the single steam supply time, controlling the multi-reactor thermochemical energy storage system to operate in a single-release dual-standby mode. In the single-release dual-standby mode, one reactor is in the energy release state, and the other reactors are in the standby state.

[0013] A second aspect of the embodiments of this disclosure provides a molten salt-thermochemical battery coupled energy storage and cooperative operation system, the system being used to implement the method described above, comprising: The molten salt thermal storage subsystem includes a molten salt storage tank, an electric heater, and a first heat exchange device, for storing heat through the electric heater and releasing heat through the first heat exchange device; A multi-reactor thermochemical energy storage subsystem includes at least three independent chemical reactors and a second heat exchange device. Each of the chemical reactors can be independently controlled to carry out a reversible thermochemical reaction to achieve heat storage or heat release. The collaborative control unit, which is communicatively connected to the power grid dispatching system, the steam demand monitoring unit, the molten salt thermal energy storage subsystem, and the multi-reactor thermochemical energy storage subsystem, is configured to execute the collaborative control strategy and send control commands to the molten salt thermal energy storage subsystem and the multi-reactor thermochemical energy storage subsystem, respectively.

[0014] Optionally, the molten salt thermal storage subsystem is connected to the multi-reactor thermochemical energy storage subsystem via thermal pipelines. The molten salt thermal storage subsystem is configured to provide an auxiliary heat source to maintain the reaction temperature when the reactors in the thermochemical energy storage subsystem are storing energy, and / or to provide a supplementary heat source when the thermochemical energy storage subsystem is releasing energy.

[0015] A third aspect of the embodiments of this disclosure provides a computer device including a memory and a processor, the memory storing a computer program, the processor executing the computer program to implement the method described above.

[0016] A fourth aspect of the embodiments of this disclosure provides a computer-readable storage medium having a computer program stored thereon that, when executed by a processor, implements the methods described above.

[0017] The beneficial effects of the embodiments of this disclosure include: In this application, by integrating the rapid response characteristics of molten salt thermal energy storage system with the high density and long-term characteristics of multi-reactor thermochemical energy storage system, and generating a collaborative control strategy based on multi-dimensional information such as electricity price, steam supply demand and real-time energy storage status, the problem of insufficient flexibility and difficulty in "storing and releasing" of single energy storage systems is solved, effectively improving the deep peak shaving, rapid frequency regulation and safe and economical steam supply capabilities of coal-fired units. Attached Figure Description

[0018] Figure 1 This is a schematic flowchart illustrating a method for molten salt-thermochemical battery coupled energy storage to assist in steam supply and frequency regulation / peak shaving operation, according to an embodiment of this disclosure. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solutions of this disclosure, the disclosure will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] The embodiments of this application will be further described in detail below with reference to the accompanying drawings and examples. The detailed descriptions and accompanying drawings of the following embodiments are used to exemplarily illustrate the principles of this application, but should not be used to limit the scope of this application; that is, this application is not limited to the described embodiments. In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," etc., indicating orientation or positional relationships are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range.

[0021] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application depending on the specific circumstances.

[0022] like Figure 1 As shown, a method for molten salt-thermochemical battery coupled energy storage to assist steam supply and frequency regulation / peak shaving operation includes: S101. Obtain grid dispatch information, steam demand information, and energy storage status information. The energy storage status information includes one or more of the following: heat storage capacity, heat storage power, and remaining heat storage capacity of the molten salt thermal energy storage system; and one or more of the following of the following: heat storage capacity, reaction conversion rate, temperature level, and remaining heat storage capacity of the thermochemical energy storage system.

[0023] S102. Based on the power grid dispatch information, the steam supply demand information, and the energy storage status information, a collaborative control strategy is generated.

[0024] S103. Based on the aforementioned collaborative control strategy, control the molten salt thermal storage system and the multi-reactor thermochemical energy storage system to perform corresponding energy storage and release operations.

[0025] The heat storage and heat release processes of the molten salt thermal energy storage system are configured to be independently controlled. The multi-reactor thermochemical energy storage system includes at least three independently controllable reactors. The collaborative control strategy is used to plan the operation mode of the molten salt thermal energy storage system and to allocate energy storage, energy release, or standby states to each reactor in the multi-reactor thermochemical energy storage system.

[0026] In this application, by integrating the rapid response characteristics of molten salt thermal energy storage system with the high density and long-term characteristics of multi-reactor thermochemical energy storage system, and generating a collaborative control strategy based on multi-dimensional information such as electricity price, steam supply demand and real-time energy storage status, the problem of insufficient flexibility and difficulty in "storing and releasing" of single energy storage systems is solved, effectively improving the deep peak shaving, rapid frequency regulation and safe and economical steam supply capabilities of coal-fired units.

[0027] In some embodiments, generating a coordinated control strategy based on the grid dispatch information, the steam demand information, and the energy storage status information includes: Based on the electricity price signal in the power grid dispatch information, an initial operating mode is generated. The initial operating mode is used to specify the number of reactors in the multi-reactor thermochemical energy storage system that are in the energy storage state and the energy release state.

[0028] Based on the steam demand information, the initial operating mode is modified for the first time to adjust the number of reactors in the energy release state.

[0029] Based on the energy storage status information, the operating mode after the first correction is corrected a second time, and the energy storage and release power of the molten salt thermal energy storage system is determined to compensate for or coordinate with the operation of the thermochemical energy storage system.

[0030] In some embodiments, generating the initial operating mode based on the electricity price signal in the power grid dispatch information includes: When the electricity price signal indicates that it is currently a low electricity price period, the initial operating mode is configured to prioritize increasing the number of reactors in energy storage mode.

[0031] When the electricity price signal indicates that the current period is a high electricity price period, the initial operating mode is configured to prioritize increasing the number of reactors in the energy release state.

[0032] In some embodiments, the first modification of the initial operating mode based on the steam supply demand information includes: During periods of low electricity prices, when the steam demand exceeds a preset threshold, the initial operating mode is modified to maintain at least one reactor in an energy release state.

[0033] During periods of high electricity prices, when the steam demand exceeds a preset threshold, the initial operating mode is modified to maintain at least two reactors in an energy release state.

[0034] In some embodiments, the states assigned to each reactor in a multi-reactor thermochemical energy storage system are combined to form a variety of predetermined operating modes, including a three-release mode, a three-storage mode, a two-storage-one-release mode, a one-storage-two-release mode, and a one-storage-one-release-one-standby mode.

[0035] When the predetermined operating mode is the three-release mode, all reactors are in the energy release state.

[0036] When the predetermined operating mode is the three-storage mode, all reactors are in an energy storage state.

[0037] When the predetermined operating mode is the two-storage-one-release mode, two reactors are in the energy storage state and one reactor is in the energy release state.

[0038] When the predetermined operating mode is a one-storage-two-release mode, one reactor is in the energy storage state and the two reactors are in the energy release state.

[0039] When the predetermined operating mode is a one-storage-one-release-standby mode, one reactor is in the energy storage state, one reactor is in the energy release state, and one reactor is in the standby state.

[0040] In some embodiments, the collaborative control strategy further includes: when it is necessary to extend the single steam supply time, controlling the multi-reactor thermochemical energy storage system to operate in a single-release dual-standby mode, in which one reactor is in the energy release state and the other reactors are in the standby state.

[0041] A second aspect of the embodiments of this disclosure provides a molten salt-thermochemical battery coupled energy storage and cooperative operation system, the system being used to implement the method described above, comprising: The molten salt thermal storage subsystem includes a molten salt storage tank, an electric heater, and a first heat exchange device, for storing heat through the electric heater and releasing heat through the first heat exchange device.

[0042] A multi-reactor thermochemical energy storage subsystem includes at least three independent chemical reactors and a second heat exchange device. Each of the chemical reactors can be independently controlled to carry out a reversible thermochemical reaction to achieve heat storage or heat release.

[0043] The collaborative control unit, which is communicatively connected to the power grid dispatching system, the steam demand monitoring unit, the molten salt thermal energy storage subsystem, and the multi-reactor thermochemical energy storage subsystem, is configured to execute the collaborative control strategy and send control commands to the molten salt thermal energy storage subsystem and the multi-reactor thermochemical energy storage subsystem, respectively.

[0044] In some embodiments, the molten salt thermal storage subsystem is connected to the multi-reactor thermochemical energy storage subsystem via thermal pipelines. The molten salt thermal storage subsystem is configured to provide an auxiliary heat source to maintain the reaction temperature when the reactors of the thermochemical energy storage subsystem are storing energy, and / or to provide a supplementary heat source when the thermochemical energy storage subsystem is releasing energy.

[0045] A third aspect of the embodiments of this disclosure provides a computer device including a memory and a processor, the memory storing a computer program, the processor executing the computer program to implement the method described above.

[0046] A fourth aspect of the embodiments of this disclosure provides a computer-readable storage medium having a computer program stored thereon that, when executed by a processor, implements the methods described above.

[0047] Specifically, the system described in this application mainly includes: a multi-reactor thermochemical energy storage system (also known as a multi-reactor thermochemical battery energy storage system), a molten salt thermal energy storage system, a brine heat exchanger, and a steam-water heat exchanger. Among them: As an auxiliary regulating unit, the molten salt thermal storage system participates in grid frequency regulation by utilizing the rapid response capability of the electric heater. On the other hand, it serves as a stable and controllable intermediate heat source, providing part of the steam supply to the system and maintaining the temperature stability of the thermochemical reaction bed.

[0048] The thermochemical energy storage system consists of three independent reactors, which combine different operating states to achieve parallel operation of energy storage and release.

[0049] Multi-reactor collaborative operation modes include, but are not limited to, the following typical modes: (1) Maximum energy release mode (three-release mode): The three reactors are in the energy release state at the same time, the system outputs the maximum heat supply capacity, and the reactor temperature is maintained by self-balancing or molten salt system.

[0050] (2) Maximum energy storage mode (three-storage mode): Three reactors are in the energy storage state at the same time. The reaction temperature is maintained by absorbing electrical energy and the energy storage process is completed. The low-grade heat generated by the reaction is used for heating network supply during the heating season and for other heat load utilization or system regulation during the non-heating season.

[0051] (3) Flexible operation mode to meet the needs of immediate storage and release: Dynamic adjustment is achieved through the combination of multiple reactor states, including but not limited to three operation modes: "two storage and one release", "one storage and two release" and "one storage, one release and one standby", to meet the needs of heating and steam supply regulation under different working conditions.

[0052] Among them, the two-storage-one-release mode can achieve simultaneous energy storage and steam release, while the two-release-one-storage mode requires energy release and steam release, and the one-storage-one-release-one-standby mode operates by releasing steam while maintaining the heat storage capacity.

[0053] (5) Longest energy release time mode: Only one group of reactors releases heat at the same time, while the other two groups are on standby. This operating mode has the longest energy release time.

[0054] Furthermore, this invention proposes a molten salt-thermochemical battery collaborative operation optimization control method based on multi-dimensional coupling constraints of electricity price signals, steam supply demand, and energy storage status. By coordinating the storage and release characteristics of the molten salt thermal storage system and the thermochemical energy storage system, it achieves synergistic optimization of system economy, flexibility, and steam supply reliability under different operating conditions. Specifically, it includes: (1) Formulation of initial operation strategy based on electricity price signal Using time-of-use pricing or real-time pricing as decision inputs, and combining grid dispatch information, time-of-use optimization planning is carried out for system operation.

[0055] 1) During periods of short-term low electricity prices, the maximum energy storage mode (three-stage storage) should be prioritized to fully utilize low-cost electricity to drive the thermochemical energy storage system to complete rapid energy storage and maximize energy storage capacity.

[0056] 2) During periods of prolonged low electricity prices, the two-storage-one-release model should be prioritized. While maintaining a high energy storage rate, the system continuously releases energy to produce steam through a single reactor, achieving coordinated operation of "storing energy while supplying steam". This improves the system's operational flexibility during periods of low electricity prices and reduces overall steam supply costs.

[0057] 3) During periods of high electricity prices, the maximum energy release mode (three-stage release) will be prioritized to release the heat stored in the thermochemical energy storage system, thereby increasing steam supply capacity and unit grid load, maximizing the use of the high electricity price window to obtain revenue, and reserving energy storage space for the next round of low electricity price energy storage.

[0058] (2) Operation strategy adjustment mechanism considering steam supply demand constraints Based on the initial operation plan, the load forecast results of heat users are introduced to dynamically adjust the operation mode for different electricity price stages.

[0059] 1) When electricity prices are low and steam demand is high, priority should be given to ensuring the number of reactors on the energy release side. The operation mode should be switched from three storage reactors to two storage reactors and one release reactor, or further switched from two storage reactors and one release reactor to one storage reactor and two release reactors, so as to improve the instantaneous steam supply capacity while ensuring energy storage capacity.

[0060] 2) When electricity prices are low and steam demand is low or fluctuates little, a one-storage-one-release-one-standby mode is adopted. Through the coordinated configuration of a single energy storage unit, a single energy release unit, and a single standby unit, the basic steam supply capacity of the system is maintained while ensuring the stability of the energy storage level.

[0061] 3) When electricity prices are high and steam demand is high, the maximum energy release mode (three-stage release) is adopted to release the stored heat in a concentrated manner, giving priority to meeting the high load steam demand and simultaneously increasing power generation revenue.

[0062] 4) When electricity prices are high and steam demand is low, the mode with the longest energy release time (single release and dual standby) should be given priority, or the number of energy release reactors should be dynamically adjusted according to the real-time load to achieve a balance between maximizing revenue and sustainable utilization of energy storage.

[0063] (3) Dynamic rolling correction mechanism based on energy storage state Real-time monitoring of energy storage status parameters of molten salt thermal storage system and thermochemical energy storage system, including heat storage, reaction conversion rate, reactor temperature level and remaining available capacity, and rolling optimization of operation plan based on energy storage status, and dynamic compensation for thermochemical energy storage capacity gap using molten salt thermal storage system.

[0064] 1) When electricity prices are low, steam demand is high, and the remaining capacity of thermochemical energy storage is insufficient, the thermochemical system shall prioritize charging; the molten salt system shall operate on an "instant charging and discharging" basis and undertake the main steam supply task.

[0065] 2) When electricity prices are low, steam demand is high, and the remaining capacity of thermochemical energy storage is sufficient, the thermochemical system adopts the "two storage and one release" mode to provide steam supply; the molten salt system stores energy simultaneously and provides auxiliary heating.

[0066] 3) When electricity prices are low, steam demand is low, and thermochemical energy storage capacity is insufficient, the "three-storage" approach is adopted to enhance energy storage, with the molten salt system undertaking all immediate steam supply tasks.

[0067] 4) When electricity prices are low, steam demand is low, and thermochemical energy storage capacity is sufficient, a "one-storage-one-release-one-standby" mode is adopted to maintain a high energy storage level, with the insufficient part being compensated by the molten salt system.

[0068] 5) When electricity prices are high, steam demand is high, and thermochemical energy storage capacity is insufficient, the molten salt system releases energy first to ensure continuous steam supply.

[0069] 6) When electricity prices are high, steam demand is high, and thermochemical energy storage capacity is sufficient, molten salt thermal energy storage and thermochemical energy storage release energy in synergy, thereby increasing the unit's on-grid load while meeting steam demand.

[0070] 7) When electricity prices are high, steam demand is low, and thermochemical energy storage capacity is insufficient, molten salt systems will release energy first to make up for the output capacity gap.

[0071] 8) When electricity prices are high, steam demand is low, and thermochemical energy storage capacity is sufficient, thermochemical energy storage should be released first to maximize the value of high-grade energy storage resources.

[0072] Through the above method, the present invention realizes multi-mode coordinated switching and dynamic optimization control of molten salt thermal energy storage system and thermochemical energy storage system under different electricity price ranges, different steam supply demands and different energy storage states, giving full play to the complementary advantages of the two types of energy storage systems in terms of response speed, energy storage density and operating economy, and improving the overall operating benefits, steam supply reliability and new energy consumption capacity of the system.

[0073] This application proposes a molten salt-thermochemical energy storage synergistic coupling operation system: constructing a molten salt thermal energy storage system and a multi-reactor thermochemical energy storage system to coordinate their operation. The rapid response characteristics of the molten salt system, which allows for "immediate storage and release," are used to compensate for the inability of thermochemical energy storage to store and release simultaneously, thereby achieving complementary advantages among multiple energy storage systems.

[0074] Establish a multi-reactor, multi-mode collaborative operation method: For thermochemical energy storage systems, propose multiple operation modes such as "three storage, three release, two storage and one release, one storage and two release, one storage, one release and one standby", and clarify the applicable scenarios under different modes to achieve flexible combination and dynamic adjustment of energy storage and release.

[0075] A collaborative optimization control strategy under multidimensional constraints is proposed: a multidimensional coupled decision-making mechanism is constructed with electricity price signals, steam supply demand and energy storage status as the core to realize time-sharing optimization and dynamic correction of the operation mode, taking into account system economy, steam supply stability and energy storage efficiency.

[0076] A rolling optimization scheduling method based on energy storage status is proposed: by monitoring the energy storage capacity and reaction status in real time, the operation strategy of molten salt and thermochemical energy storage systems is dynamically adjusted to achieve optimal allocation of energy storage resources and adaptive compensation for capacity gaps.

[0077] Achieving a synergistic improvement in the flexibility and economy of coal-fired power units: By coordinating the operation of multiple energy storage systems, the peak-shaving and frequency regulation capabilities and steam supply flexibility of the units are effectively enhanced, while the electricity price response strategy is optimized to improve the overall operating benefits of the system and the capacity for renewable energy consumption.

[0078] The computer-readable medium may be included in the system of this application or may exist independently.

[0079] The computer-readable storage medium may be any tangible medium that contains or stores a program, and may be an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device. More specific examples include, but are not limited to: an electrical connection having one or more wires, a portable computer disk, a hard disk, an optical fiber, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0080] The computer-readable storage medium may also include data signals propagated in baseband or as part of a carrier wave, carrying computer-readable program code, specific examples of which include, but are not limited to, electromagnetic signals, optical signals, or any suitable combination thereof.

[0081] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of this disclosure, and this disclosure is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and substance of this disclosure, and these modifications and improvements are also considered to be within the scope of protection of this disclosure.

Claims

1. A method for molten salt-thermochemical battery coupled energy storage to assist steam supply and frequency regulation / peak shaving operation, characterized in that, include: The system acquires grid dispatch information, steam demand information, and energy storage status information. The energy storage status information includes one or more of the following: heat storage capacity, heat storage power, and remaining heat storage capacity of the molten salt thermal energy storage system; and one or more of the following: heat storage capacity, reaction conversion rate, temperature level, and remaining heat storage capacity of the thermochemical energy storage system. Based on the power grid dispatch information, the steam supply demand information, and the energy storage status information, a collaborative control strategy is generated. Based on the aforementioned collaborative control strategy, the molten salt thermal energy storage system and the multi-reactor thermochemical energy storage system are controlled to perform corresponding energy storage and release operations; The heat storage and heat release processes of the molten salt thermal energy storage system are configured to be independently controlled. The multi-reactor thermochemical energy storage system includes at least three independently controllable reactors. The collaborative control strategy is used to plan the operation mode of the molten salt thermal energy storage system and to allocate energy storage, energy release, or standby states to each reactor in the multi-reactor thermochemical energy storage system.

2. The method according to claim 1, characterized in that, The step of generating a coordinated control strategy based on the power grid dispatch information, the steam supply demand information, and the energy storage status information includes: Based on the electricity price signal in the power grid dispatch information, an initial operating mode is generated. The initial operating mode is used to specify the number of reactors in the multi-reactor thermochemical energy storage system that are in the energy storage state and the energy release state. Based on the steam supply demand information, the initial operating mode is modified for the first time to adjust the number of reactors in the energy release state. Based on the energy storage status information, the operating mode after the first correction is corrected a second time, and the energy storage and release power of the molten salt thermal energy storage system is determined to compensate for or coordinate with the operation of the thermochemical energy storage system.

3. The method according to claim 2, characterized in that, The process of generating an initial operating mode based on the electricity price signal in the power grid dispatch information includes: When the electricity price signal indicates that it is currently a low electricity price period, the initial operating mode is configured to prioritize increasing the number of reactors in energy storage mode; When the electricity price signal indicates that the current period is a high electricity price period, the initial operating mode is configured to prioritize increasing the number of reactors in the energy release state.

4. The method according to claim 2, characterized in that, The first correction of the initial operating mode based on the steam supply demand information includes: During periods of low electricity prices, when the steam demand exceeds a preset threshold, the initial operating mode is modified to maintain at least one reactor in an energy release state. During periods of high electricity prices, when the steam demand exceeds a preset threshold, the initial operating mode is modified to maintain at least two reactors in an energy release state.

5. The method according to claim 1, characterized in that, The states assigned to each reactor in a multi-reactor thermochemical energy storage system are combined to form a variety of predetermined operating modes, including a three-discharge mode, a three-storage mode, a two-storage-one-discharge mode, a one-storage-two-discharge mode, and a one-storage-one-discharge-one-standby mode. When the predetermined operating mode is the three-release mode, all reactors are in the energy release state; When the predetermined operating mode is the three-storage mode, all reactors are in an energy storage state; When the predetermined operating mode is the two-storage-one-release mode, two reactors are in the energy storage state and one reactor is in the energy release state. When the predetermined operating mode is a one-storage-two-release mode, one reactor is in the energy storage state and the two reactors are in the energy release state. When the predetermined operating mode is a one-storage-one-release-standby mode, one reactor is in the energy storage state, one reactor is in the energy release state, and one reactor is in the standby state.

6. The method according to claim 5, characterized in that, The collaborative control strategy also includes: when it is necessary to extend the single steam supply time, controlling the multi-reactor thermochemical energy storage system to operate in a single-release dual-standby mode. In the single-release dual-standby mode, one reactor is in the energy release state, and the other reactors are in the standby state.

7. A molten salt-thermochemical battery coupled energy storage and cooperative operation system, said system being used to implement the method of any one of claims 1-6, characterized in that, include: The molten salt thermal storage subsystem includes a molten salt storage tank, an electric heater, and a first heat exchange device, for storing heat through the electric heater and releasing heat through the first heat exchange device; A multi-reactor thermochemical energy storage subsystem includes at least three independent chemical reactors and a second heat exchange device. Each of the chemical reactors can be independently controlled to carry out a reversible thermochemical reaction to achieve heat storage or heat release. The collaborative control unit, which is communicatively connected to the power grid dispatching system, the steam demand monitoring unit, the molten salt thermal energy storage subsystem, and the multi-reactor thermochemical energy storage subsystem, is configured to execute the collaborative control strategy and send control commands to the molten salt thermal energy storage subsystem and the multi-reactor thermochemical energy storage subsystem, respectively.

8. The system according to claim 7, characterized in that, The molten salt thermal storage subsystem is connected to the multi-reactor thermochemical energy storage subsystem via thermal pipelines. The molten salt thermal storage subsystem is configured to provide an auxiliary heat source to maintain the reaction temperature when the reactors of the thermochemical energy storage subsystem are storing energy, and / or to provide a supplementary heat source when the thermochemical energy storage subsystem is releasing energy.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the method as described in any one of claims 1 to 6.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the method as described in any one of claims 1 to 6.

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