Load rejection stability control system and control method of compressed air energy storage power generation system

Abstract

The application provides a kind of compressed air energy storage power generation system load rejection stability control system and control method, gas storage tank;Air inlet of the air inlet regulating pipeline is communicated with gas storage tank;Heating expansion pipeline;Control terminal is used to obtain the real-time temperature of the air inlet of the second expander, at least one first expander respectively and the real-time rotating speed of the main shaft of generator, determines the rotating speed difference value based on the real-time rotating speed and rated rotating speed, generates target control strategy set based on the rotating speed difference value, the real-time temperature of the air inlet of the second expander and at least one first expander.The application solves the problem that the rotating speed is difficult to stabilize quickly after load rejection in the compressed air energy storage power generation of prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compressed air energy storage system design, in particular to a load rejection stability control system and control method for a compressed air energy storage power generation system. BACKGROUND

[0002] With the rapid development of renewable energy, the supply and demand fluctuations of the power grid are intensified, and the compressed air energy storage system (CAES) is valued for its large-scale energy storage capacity and peak shaving capability. The CAES system stores energy in the form of compressed air during periods of low electricity demand and releases the air to drive an expander to generate electricity during periods of high demand.

[0003] Energy storage systems are an important part of the power system, mainly used to store excess electricity and release it when needed. In the power grid, the energy storage stage and the energy release stage of the energy storage system are usually carried out separately. In the energy storage stage, when the electricity supply in the power grid exceeds the demand, the energy storage system will store the excess electricity; in the energy release stage, when the electricity demand in the power grid exceeds the supply, the energy storage system will release the stored electricity to meet the demand of the power grid.

[0004] Currently, with the rapid development of renewable energy, the supply and demand fluctuations of the power grid are intensified, and the compressed air energy storage system (CAES) is valued for its large-scale energy storage capacity and peak shaving capability. The CAES system stores energy in the form of compressed air during periods of low electricity demand and releases the air to drive an expander to generate electricity during periods of high demand. However, the existing CAES system may experience a sharp rise in expander speed when encountering load rejection caused by power grid failure or sudden demand drop due to the delay in closing the intake valve, resulting in an overspeed accident and endangering equipment safety and system stability. SUMMARY

[0005] The main purpose of the present application is to provide a load rejection stability control system and control method for a compressed air energy storage power generation system to solve the problem of difficulty in quickly stabilizing the speed after load rejection in the prior art.

[0006] To achieve the above objectives, according to one aspect of the present invention, a load shedding stability control system for a compressed air energy storage power generation system is provided, characterized in that it comprises: an air storage tank; an air inlet regulating pipeline, the air inlet of which is connected to the air storage tank; and a heating expansion pipeline, which includes a main heating expansion branch and at least one heating expansion sub-branch, the heating expansion sub-branch including a first plate heat exchanger, the gas inlet of which is connected to the outlet of the air inlet regulating pipeline, the gas outlet of which is connected to the inlet of a first expander inlet regulating valve, the outlet of which is connected to the inlet of the first expander, and the outlet of the first expander being connected to the outlet of the first expander. The valve and the inlet of the first exhaust valve are connected in parallel. The outlet of the first expander outlet regulating valve is connected to the gas inlet of the second plate heat exchanger in the main branch of the heating expansion circuit. The gas outlet of the second plate heat exchanger is connected to the inlet of the second expander inlet regulating valve. The outlet of the second expander inlet regulating valve is connected to the inlet of the second expander. The outlet of the second expander is connected to external equipment. The hot fluid inlet of the second plate heat exchanger and at least one of the first plate heat exchangers is connected to the hot fluid outlet of the corresponding second heat exchange valve and at least one of the first heat exchange valves in the heating expansion branch circuit. The hot fluid inlet of the second heat exchange valve and at least one of the first heat exchange valves in the heating expansion branch circuit is connected to the hot fluid outlet of the heat pump.

[0007] Further, the load shedding stabilization control system includes: a generator, the main shaft of which is coaxially arranged with the second expander, and the second expander being coaxially arranged with at least one first expander on the heating expansion branch; a speed measuring device, which is disposed on the main shaft of the generator for acquiring the real-time speed of the main shaft of the generator; a temperature sensor, including a first temperature sensor and at least one second temperature sensor, the first temperature sensor being disposed at the air inlet of the second expander for acquiring the real-time temperature of the air inlet of the second expander, and at least one second temperature sensor being disposed at the corresponding air inlet of the first expander for acquiring the real-time temperature of the air inlet of at least one first expander; and a control terminal, which is electrically connected to the speed measuring device, the second heat exchange valve, the first expander inlet regulating valve, the first expander outlet regulating valve, the first exhaust valve, the first temperature sensor, at least one second temperature sensor, and at least one first heat exchange valve, respectively.

[0008] Furthermore, the heat pump's hot fluid inlet is connected to the heat storage tank's hot fluid outlet.

[0009] Furthermore, the cold fluid inlets of the second plate heat exchanger and at least one of the first plate heat exchangers are respectively connected to the cold storage tank.

[0010] Furthermore, the air intake regulating pipeline includes a high-pressure main air valve whose air inlet is connected to the air outlet of the air storage tank. The air outlet of the high-pressure main air valve is connected to the air inlets of the rotation regulating valve and the power regulating valve, respectively. The air outlets of the rotation regulating valve and the power regulating valve are connected to the gas inlet of the first plate heat exchanger, respectively. The control terminal is electrically connected to the high-pressure main air valve, the rotation regulating valve and the power regulating valve, respectively.

[0011] Furthermore, a main heat exchange valve is provided between the hot fluid inlet of the second heat exchange valve and at least one of the first heat exchange valves and the heat pump.

[0012] Furthermore, the generator is electrically connected to the power grid via a grid-connected switch. When two or more heating expansion branches are provided, the two or more heating expansion branches are arranged in series respectively.

[0013] According to another aspect of the present invention, a load shedding stabilization control method for a compressed air energy storage power generation system is also provided, applied to a control terminal in the load shedding stabilization control system of the aforementioned compressed air energy storage power generation system, the method comprising:

[0014] In response to the disconnection of the grid-connected switch from the power grid, an overspeed prevention control strategy set is generated. The overspeed prevention control strategy set is used to control the high-pressure main gas valve, the surge regulating valve, the power regulating valve, the second heat exchange valve, at least one first expander inlet regulating valve, at least one first expander outlet regulating valve, and at least one first heat exchange valve to perform target actions. The target actions include at least one of the following: responding to the target opening degree and refusing to respond to the target opening degree.

[0015] Furthermore, in response to the real-time spindle speed being a first speed, a load shedding speed adjustment strategy set is executed. The load shedding speed adjustment strategy set is used to control the throttle regulating valve, power regulating valve, second heat exchange valve, at least one first expander inlet regulating valve, at least one first expander outlet regulating valve, and at least one first heat exchange valve to perform the target action. In response to the real-time spindle speed being a second speed, the execution of the target action is stopped to wait for the grid connection command to be received again, wherein the first speed is less than the second speed.

[0016] Further, in response to the real-time spindle speed being a first speed, the execution of the load shedding speed adjustment strategy set includes: generating a first control strategy in response to a target opening of 1 to control the load shedding speed adjustment strategy set, wherein the first control strategy is used to control the throttle regulating valve, the first expander inlet regulating valve, the first heat exchange valve, and the first exhaust valve to perform the target action; generating a second control strategy in response to a target opening of 0 to control the load shedding speed adjustment strategy set, wherein the second control strategy is used to control the first exhaust valve, and generating a command in response to a target opening of 1 to send to the first expander outlet regulating valve, the second expander inlet regulating valve, and the second heat exchange valve to perform the target action.

[0017] By applying the technical solution of this invention, the speed of the expander can be precisely controlled by controlling the inlet temperature of the expander. This allows the speed of the compressed air energy storage system to be quickly stabilized to the rated speed when a fault occurs or the load changes, thus solving the problem that the speed of compressed air energy storage power generation is difficult to stabilize quickly after load shedding. Attached Figure Description

[0018] Figure 1 A schematic diagram of an embodiment of the load shedding stability control system of the compressed air energy storage power generation system according to the present invention is shown.

[0019] Figure 2 A PID control diagram is shown as an embodiment of the load shedding stabilization control method for a compressed air energy storage power generation system according to the present invention.

[0020] The above figures include the following reference numerals:

[0021] 1. Gas storage tank;

[0022] 2. Heat storage tank;

[0023] 3. Cold storage tank;

[0024] 4. First expander;

[0025] 5. Third expander;

[0026] 6. Fourth expander;

[0027] 7. Second expander;

[0028] 8. First plate heat exchanger;

[0029] 9. Third plate heat exchanger;

[0030] 10. Fourth plate heat exchanger;

[0031] 11. Second plate heat exchanger;

[0032] 12. Main heat exchange valve;

[0033] 13. High-pressure main air valve;

[0034] 14. Rotation control valve;

[0035] 15. Power regulating valve;

[0036] 16. Inlet regulating valve of the first expander;

[0037] 17. First expander outlet regulating valve;

[0038] 18. Inlet regulating valve of the third expander;

[0039] 19. Second expander outlet regulating valve;

[0040] 20. Inlet regulating valve of the fourth expander;

[0041] 21. Third expander outlet regulating valve;

[0042] 22. Inlet regulating valve of the second expander;

[0043] 23. First exhaust valve;

[0044] 24. Second exhaust valve;

[0045] 25. Third exhaust valve;

[0046] 26. First heat exchange valve;

[0047] 27. Third heat exchange valve;

[0048] 28. Fourth heat exchange valve;

[0049] 29. Second heat exchange valve;

[0050] 30. Heat pump;

[0051] 31. Generator. Detailed Implementation

[0052] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0053] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0054] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0055] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of this application is thorough and complete, and that the concept of these exemplary embodiments is fully conveyed to those skilled in the art. In the drawings, for clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to denote the same devices, and therefore their description will be omitted.

[0056] Combination Figure 1 As shown in the specific embodiment of this application, a load shedding stability control system for a compressed air energy storage power generation system is provided, comprising:

[0057] The gas storage tank 1; the air inlet regulating pipeline includes a high-pressure main air valve 13 connected to the air outlet of the gas storage tank 1, and the air outlet of the high-pressure main air valve 13 is connected to the air inlet of the rotary regulating valve 14 and the power regulating valve 15 respectively.

[0058] The heating expansion pipeline includes a main heating expansion branch and at least one heating expansion branch. The heating expansion branch includes a first plate heat exchanger 8. The gas inlet of the first plate heat exchanger 8 is connected to the outlet of the throttle regulating valve 14 and the power regulating valve 15. The gas outlet of the first plate heat exchanger 8 is connected to the inlet of the first expander inlet regulating valve 16. The outlet of the first expander inlet regulating valve 16 is connected to the inlet of the first expander 4. The outlet of the first expander 4 is connected in parallel with the inlet of the first expander outlet regulating valve 17 and the first exhaust valve 23, respectively.

[0059] The outlet of the first expander outlet regulating valve 17 is connected to the gas inlet of the second plate heat exchanger 11 in the main branch of the heating expansion circuit. The gas outlet of the second plate heat exchanger 11 is connected to the inlet of the second expander inlet regulating valve 22. The outlet of the second expander inlet regulating valve 22 is connected to the inlet of the second expander 7. The outlet of the second expander 7 is connected to external equipment. The hot fluid inlets of the second plate heat exchanger 11 and at least one first plate heat exchanger 8 are respectively connected to the hot fluid outlets of the corresponding second heat exchange valve 29 and at least one first heat exchange valve 26. The hot fluid inlets of the second heat exchange valve 29 and at least one first heat exchange valve 26 are respectively connected to the heat pump 30. A heat exchange master valve 12 is installed between the hot fluid inlets of the second heat exchange valve 29 and at least one first heat exchange valve 26 and the heat pump 30.

[0060] The main shaft of the generator 31 is coaxially arranged with the second expander 7, and the second expander 7 is coaxially arranged with at least one first expander 4; a speed measuring device is installed on the main shaft of the generator 31 to obtain the real-time speed of the main shaft of the generator 31; a temperature sensor includes a first temperature sensor and at least one second temperature sensor, the first temperature sensor is installed at the air inlet of the second expander 7 to obtain the real-time temperature of the air inlet of the second expander 7, and at least one second temperature sensor is installed at the air inlet of the corresponding first expander 4 to obtain the real-time temperature of the air inlet of at least one first expander 4;

[0061] The control terminal is electrically connected to the high-pressure main air valve 13, the slewing regulating valve 14, the power regulating valve 15, the speed measuring device, the second heat exchange valve 29, at least one first expander inlet regulating valve 16, at least one first expander outlet regulating valve 17, at least one first exhaust valve 23, the first temperature sensor, at least one second temperature sensor, and at least one first heat exchange valve 26, respectively, for acquiring the real-time inlet temperature of the second expander 7 and at least one first expander 4, and the real-time main shaft speed of the generator 31, and determining the speed based on the real-time main shaft speed and the rated speed. A target control strategy set is generated based on the speed difference, the real-time temperature of the inlet of the second expander 7, and the real-time temperature of the inlet of at least one first expander 4. The target control strategy set is used to control the intake regulating pipeline, the second heat exchange valve 29, at least one first expander inlet regulating valve 16, the high-pressure main air valve 13, the surge regulating valve 14 and the power regulating valve 15, at least one first expander outlet regulating valve 17 and at least one first heat exchange valve 26 to perform target actions. The target actions include at least one of the following: responding to the target opening degree and refusing to respond to the target opening degree.

[0062] The hot fluid inlet of the heat pump 30 is connected to the hot fluid outlet of the heat storage tank 2, and the cold fluid inlets of the second plate heat exchanger 11 and at least one first plate heat exchanger 8 are respectively connected to the cold storage tank 3. The generator 31 is electrically connected to the power grid via a grid-connected switch. Applying the technical solution of this invention, when two or more of the aforementioned heating expansion branches are provided, the two or more heating expansion branches are connected separately.

[0063] like Figure 1 As shown, the outlet of the first expander outlet regulating valve 17 is connected to the gas inlet of the third plate heat exchanger 9; the gas outlet of the third plate heat exchanger 9 is connected to the inlet of the third expander inlet regulating valve 18; the outlet of the third expander inlet regulating valve 18 is connected to the inlet of the third expander 5; the outlet of the third expander 5 is connected in parallel with the inlets of the second expander outlet regulating valve 19 and the second exhaust valve 24; the outlet of the second expander outlet regulating valve 19 is connected to the gas inlet of the fourth plate heat exchanger 10; the gas outlet of the fourth plate heat exchanger 10 is connected to the inlet of the fourth expander inlet regulating valve 20; the outlet of the fourth expander inlet regulating valve 20 is connected to the inlet of the fourth expander 6; the outlet of the second expander 7 is connected in parallel with the inlets of the third expander outlet regulating valve 21 and the third exhaust valve 25; and the third expander outlet regulating valve 21 is connected to the gas inlet of the second plate heat exchanger 11 in the main heating and expansion branch.

[0064] Meanwhile, the hot fluid inlets of the second plate heat exchanger 11, the first plate heat exchanger 8, the third plate heat exchanger 9, and the fourth plate heat exchanger 10 are connected to the hot fluid outlets of the corresponding second heat exchange valve 29, the first heat exchange valve 26, the third heat exchange valve 27, and the fourth heat exchange valve 28. The hot fluid inlets of the second heat exchange valve 29, the first heat exchange valve 26, the third heat exchange valve 27, and the fourth heat exchange valve 28 are respectively connected to the heat exchange master valve 12, which is connected to the heat pump 30.

[0065] According to another embodiment of the present invention, a load shedding stabilization control method for a compressed air energy storage power generation system includes the following steps:

[0066] In response to the disconnection of the grid-connected switch from the power grid, an overspeed prevention control strategy set is generated. The overspeed prevention control strategy is used to control the high-pressure main gas valve 13, the surge regulating valve 14, the power regulating valve 15, the second heat exchange valve 29, at least one first expander inlet regulating valve 16, at least one first expander outlet regulating valve 17, and at least one first heat exchange valve 26 to perform target actions. The target actions include at least one of the following: responding to the target opening degree and refusing to respond to the target opening degree.

[0067] In response to the real-time spindle speed being the first speed, the load shedding speed regulation strategy set is executed. The load shedding speed regulation strategy set is used to control the throttle regulating valve 14, the power regulating valve 15, the second heat exchange valve 29, at least one first expander inlet regulating valve 16, at least one first expander outlet regulating valve 17 and at least one first heat exchange valve 26 to perform the target action.

[0068] In one embodiment of the present invention, the target opening degree is the target opening degree of the high-pressure main gas valve 13, the surge regulating valve 14, the power regulating valve 15, the second heat exchange valve 29, at least one first expander inlet regulating valve 16, at least one first expander outlet regulating valve 17, and at least one first heat exchange valve 26.

[0069] The target action is stopped when the real-time spindle speed is the second speed, in order to wait for the grid connection command to be received again, wherein the first speed is less than the second speed and the second speed is the rated speed.

[0070] The above-mentioned overspeed control strategies include:

[0071] The command to generate a target opening degree of 0 is sent to the throttle regulating valve 14, the power regulating valve 15, the second heat exchange valve 29, at least one first expander inlet regulating valve 16, at least one first expander outlet regulating valve 17 and at least one first heat exchange valve 26 respectively.

[0072] The above-mentioned load shedding speed regulation strategy includes:

[0073] The first control strategy in the control load shedding speed regulation strategy set is generated when the target opening degree is 1. The first control strategy is used to control the throttle regulating valve 14, the first expander inlet regulating valve 16, the first heat exchange valve 26 and the first exhaust valve 23 to perform the target action.

[0074] The second control strategy in the control load shedding speed adjustment strategy set is generated in response to the target opening degree of 0. The second control strategy is used to control the first exhaust valve 23 and generate a response target opening degree of 1 command to send to the first expander outlet regulating valve 17, the second expander inlet regulating valve 22 and the second heat exchange valve 29 to execute the target action.

[0075] In one embodiment of the present invention, the control terminal determines the speed difference based on the real-time speed of the spindle and the rated speed, obtains the inlet temperature through a first temperature sensor and at least one second temperature sensor, compares it with the set value, and controls the opening of the heat exchanger flow control valve to control the compressed air entering the expander to perform work, thereby achieving the purpose of controlling the speed.

[0076] PID control method Figure 2 As shown, the transfer function for speed regulation is:

[0077]

[0078] Where RS is the real-time spindle speed, Tm is the time constant of the temperature module, Kp, Ti and Td are the proportional coefficient, integral time and derivative time, respectively, Ti is the time constant of the valve system and Kr is the gain.

[0079] In one embodiment of the present invention, the above-mentioned load shedding speed adjustment strategy further includes: when there are two or more heating expansion branch circuits, the opening and closing commands of the valves in the main heating expansion branch circuit are repeated sequentially until the opening and closing command of the valves in the last main heating expansion branch circuit is executed.

[0080] In one embodiment of the present invention, the overspeed prevention control strategy includes:

[0081] The command to generate a target opening degree of 0 is sent to the following valves respectively: the slewing regulating valve 14, the power regulating valve 15, the first expander inlet regulating valve 16, the first expander outlet regulating valve 17, the third expander inlet regulating valve 18, the second expander outlet regulating valve 19, the fourth expander inlet regulating valve 20, the third expander outlet regulating valve 21, the first heat exchange valve 26, the third heat exchange valve 27, the fourth heat exchange valve 28, and the second heat exchange valve 29 to execute the target action.

[0082] In one embodiment of the present invention, the above-mentioned load shedding speed regulation strategy includes:

[0083] The command to respond to the target opening degree of 1 is sent to the spur control valve 14, the first expander inlet control valve 16, the first heat exchange valve 26 and the first exhaust valve 23 respectively;

[0084] When the target opening degree is 0, the first exhaust valve 23 is sent; when the target opening degree is 1, the first expander outlet regulating valve 17, the third expander inlet regulating valve 18, the third heat exchange valve 27, and the second exhaust valve 24 are sent to execute the target action.

[0085] When the target opening degree is 0, the second exhaust valve 24 is sent; when the target opening degree is 1, the fourth expander inlet regulating valve 20, the second expander outlet regulating valve 19, the fourth heat exchange valve 28 and the third exhaust valve 25 are sent to execute the target action respectively.

[0086] When the target opening degree is 0, the third exhaust valve 25 is sent; when the target opening degree is 1, the second expander inlet regulating valve 22, the third expander outlet regulating valve 21, and the second heat exchange valve 29 are sent to execute the target action.

[0087] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0088] This invention achieves precise control of the expander's rotational speed by controlling the expander's inlet temperature, enabling the compressed air energy storage system to quickly stabilize its speed back to the rated speed when a fault occurs or the load changes. Through an improved control strategy, it can respond rapidly under load shedding conditions, effectively controlling and stabilizing the expander's speed, thus improving the system's safety and reliability. The technical solution of this invention allows the CAES system to operate more stably in the face of grid fluctuations, playing a significant role in promoting the commercial application of compressed air energy storage technology.

[0089] According to an embodiment of the present invention, a method embodiment of a load shedding stability control method for a compressed air energy storage power generation system is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0090] This method embodiment can be executed in an electronic device or similar computing device that includes memory and a processor. Taking operation on a terminal as an example, the terminal may include one or more processors (processors may include, but are not limited to, central processing units (CPUs), graphics processing units (GPUs), digital signal processing (DSP) chips, microcontroller units (MCUs), field programmable gate arrays (FPGAs), neural network processors (NPUs), tensor processors (TPUs), artificial intelligence (AI) type processors, etc.) and memory for storing data. Optionally, the terminal may also include transmission devices, input / output devices, and display devices for communication functions. Those skilled in the art will understand that the above structural description is merely illustrative and does not limit the structure of the terminal. For example, the terminal may include more or fewer components than described above, or have a different configuration than described above.

[0091] The memory can be used to store computer programs, such as application software programs and modules, like the computer program corresponding to the load shedding stabilization control method of the compressed air energy storage power generation system in this embodiment of the invention. The processor executes various functional applications and data processing by running the computer program stored in the memory, thereby realizing the aforementioned load shedding stabilization control method of the compressed air energy storage power generation system. The memory may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory may further include memory remotely located relative to the processor, and these remote memories can be connected to a mobile terminal via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0092] The transmission device is used to receive or send data via a network. Specific examples of the network described above may include a wireless network provided by the mobile terminal's communication provider. In one example, the transmission device includes a Network Interface Controller (NIC), which can connect to other network devices via a base station to communicate with the Internet. In another example, the transmission device may be a Radio Frequency (RF) module, used for wireless communication with the Internet.

[0093] Display devices can be, for example, touchscreen liquid crystal displays (LCDs) and touch displays (also referred to as "touchscreens" or "touch displays"). The LCD allows users to interact with the user interface of the mobile terminal. In some embodiments, the mobile terminal has a graphical user interface (GUI), which allows users to interact with the GUI through finger contact and / or gestures on a touch-sensitive surface. Optional human-computer interaction functions include: creating web pages, drawing, word processing, creating electronic documents, playing games, video conferencing, instant messaging, sending and receiving emails, call interfaces, playing digital video, playing digital music, and / or web browsing, etc. Executable instructions for performing the above human-computer interaction functions are configured / stored in one or more processor-executable computer program products or readable storage media.

[0094] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods according to the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0095] This invention also provides a load shedding stabilization control device for a compressed air energy storage power generation system. This device is used to implement the above embodiments and preferred embodiments, and details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0096] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0097] In addition to the above, it should be noted that the terms "one embodiment," "another embodiment," and "embodiment" used in this specification refer to specific features, structures, or characteristics described in connection with that embodiment, which are included in at least one embodiment described in the general description of this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in connection with any embodiment, the intention is to suggest that implementing such a feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this invention.

[0098] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0099] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A load shedding stability control system for a compressed air energy storage power generation system, characterized in that, include: Gas storage tank (1); An air intake regulating pipe, wherein the air intake port of the air intake regulating pipe is connected to the air storage tank (1); The heating expansion pipeline includes a main heating expansion branch and at least one heating expansion sub-branch. The heating expansion sub-branch includes a first plate heat exchanger (8). The gas inlet of the first plate heat exchanger (8) is connected to the outlet of the inlet regulating pipeline. The gas outlet of the first plate heat exchanger (8) is connected to the inlet of the first expander inlet regulating valve (16). The outlet of the first expander inlet regulating valve (16) is connected to the inlet of the first expander (4). The outlet of the first expander (4) is connected in parallel with the inlets of the first expander outlet regulating valve (17) and the first exhaust valve (23). The outlet of the first expander outlet regulating valve (17) is connected to the second plate heat exchanger (1) of the main heating expansion branch. 1) The gas inlet of the second plate heat exchanger (11) is connected to the gas outlet of the second expander inlet regulating valve (22), the gas outlet of the second expander inlet regulating valve (22) is connected to the gas inlet of the second expander (7), the gas outlet of the second expander (7) is connected to the external equipment, the hot fluid inlet of the second plate heat exchanger (11) and at least one of the first plate heat exchangers (8) is connected to the corresponding second heat exchange valve (29) and at least one of the first heat exchange valves (26) on the heating expansion branch, the hot fluid inlet of the second heat exchange valve (29) and at least one of the first heat exchange valves (26) on the heating expansion branch is connected to the hot fluid outlet of the heat pump (30); The generator (31) has its main shaft coaxially arranged with the second expander (7), and the second expander (7) is coaxially arranged with at least one first expander (4) on the heating expansion branch. A speed measuring device is installed on the main shaft of the generator (31) to obtain the real-time speed of the main shaft of the generator (31); The temperature sensor includes a first temperature sensor and at least one second temperature sensor. The first temperature sensor is disposed at the air inlet of the second expander (7) to obtain the real-time temperature of the air inlet of the second expander (7). At least one second temperature sensor is disposed at the air inlet of the corresponding first expander (4) to obtain the real-time temperature of the air inlet of at least one first expander (4). The control terminal is electrically connected to the speed measuring device, the second heat exchange valve (29), the first expander inlet regulating valve (16), the first expander outlet regulating valve (17), the first exhaust valve (23), the first temperature sensor, at least one second temperature sensor, and at least one first heat exchange valve (26).

2. The load shedding stability control system for the compressed air energy storage power generation system according to claim 1, characterized in that, The heat pump (30) has a heat fluid inlet connected to the heat storage tank (2) with a heat fluid outlet.

3. The load shedding stability control system of the compressed air energy storage power generation system according to claim 2, characterized in that, The cold fluid inlets of the second plate heat exchanger (11) and at least one of the first plate heat exchangers (8) are respectively connected to the cold storage tank (3).

4. The load shedding stability control system of the compressed air energy storage power generation system according to claim 3, characterized in that, The air intake regulating pipeline includes a high-pressure main air valve (13) whose air inlet is connected to the air outlet of the air storage tank (1). The air outlet of the high-pressure main air valve (13) is connected to the air inlet of the rotary regulating valve (14) and the power regulating valve (15). The air outlets of the rotary regulating valve (14) and the power regulating valve (15) are connected to the gas inlet of the first plate heat exchanger (8). The control terminal is electrically connected to the high-pressure main air valve (13), the rotary regulating valve (14), and the power regulating valve (15).

5. The load shedding stability control system of the compressed air energy storage power generation system according to claim 4, characterized in that, A heat exchange master valve (12) is provided between the hot fluid inlet of the second heat exchange valve (29) and at least one of the first heat exchange valves (26) and the heat pump (30).

6. The load shedding stability control system for a compressed air energy storage power generation system according to claim 5, characterized in that, The generator (31) is electrically connected to the power grid through a grid-connected switch. When there are two or more heating expansion branches, the two or more heating expansion branches are arranged in series.

7. A load shedding stabilization control method for a compressed air energy storage power generation system, applied to the control terminal in the load shedding stabilization control system of the compressed air energy storage power generation system as described in claim 5, characterized in that, The method includes: In response to the disconnection of the grid-connected switch from the power grid, an overspeed prevention control strategy set is generated. The overspeed prevention control strategy set is used to control the high-pressure main gas valve (13), the slewing regulating valve (14), the power regulating valve (15), the second heat exchange valve (29), at least one first expander inlet regulating valve (16), at least one first expander outlet regulating valve (17), and at least one first heat exchange valve (26) to perform target actions. The target actions include at least one of the following: responding to the target opening degree and refusing to respond to the target opening degree.

8. The load shedding stability control method for a compressed air energy storage power generation system according to claim 7, characterized in that, In response to the real-time rotational speed of the main shaft being the first rotational speed, a load shedding speed adjustment strategy set is executed. The load shedding speed adjustment strategy set is used to control the throttle adjustment valve (14), the power adjustment valve (15), the second heat exchange valve (29), at least one first expander inlet adjustment valve (16), at least one first expander outlet adjustment valve (17), and at least one first heat exchange valve (26) to perform the target action. The target action is stopped when the real-time spindle speed is the second speed, in order to wait for the grid connection command to be received again, wherein the first speed is less than the second speed.

9. The load shedding stability control method for a compressed air energy storage power generation system according to claim 8, characterized in that, In response to the real-time spindle speed being a first speed, the load shedding speed adjustment strategy set is executed, including: The first control strategy in the load shedding speed regulation strategy set is generated in response to the target opening degree of 1. The first control strategy is used to control the throttle regulating valve (14), the first expander inlet regulating valve (16), the first heat exchange valve (26) and the first exhaust valve (23) to perform the target action. When the target opening is 0, a second control strategy is generated to control the load shedding speed adjustment strategy set. The second control strategy is used to control the first exhaust valve (23) and generate a response target opening of 1 command to send the first expander outlet regulating valve (17), the second expander inlet regulating valve (22) and the second heat exchange valve (29) to execute the target action.

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