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

Abstract

The invention provides a load shedding stability control system and method of a compressed air energy storage power generation system and an air storage tank. An air inlet of the air inlet adjusting pipeline is communicated with the air storage tank; heating the expansion pipeline; the control terminal is used for obtaining the real-time temperature of air inlets of the second expansion machine and the at least one first expansion machine and the real-time rotating speed of a main shaft of the generator and determining the rotating speed difference value based on the real-time rotating speed of the main shaft and the rated rotating speed. And generating a target control strategy set based on the rotating speed difference value and the real-time temperatures of the air inlets of the second expansion machine and the at least one first expansion machine. The problem that in the prior art, the rotating speed is difficult to quickly stabilize after compressed air energy storage power generation load shedding is solved.

Description

Technical Field

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

[0002] With the rapid development of renewable energy, the supply and demand fluctuations of the power grid have intensified. Compressed air energy storage system (CAES) has attracted attention for its large-scale energy storage and peak load regulation capabilities. CAES system compresses air to store energy when power demand is low, and releases air to drive expanders to drive generators to generate electricity when power demand is high.

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

[0004] At present, with the rapid development of renewable energy, the fluctuation of supply and demand in the power grid has intensified. Compressed air energy storage system (CAES) has attracted attention for its large-scale energy storage capacity and peak load regulation capacity. CAES system compresses air to store energy when power demand is low, and releases air to drive expander to drive generator to generate electricity at peak time. However, in the case of load shedding caused by power grid failure or sudden drop in demand, the speed of the expander may rise sharply due to the delay in closing the intake valve, resulting in overspeed accidents, endangering equipment safety and system stability. Summary of the invention

[0005] The main purpose of the present invention is to provide a load rejection stability control system and control method for a compressed air energy storage power generation system, so as to solve the problem in the prior art that the speed of compressed air energy storage power generation is difficult to quickly stabilize after load rejection.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided a load rejection stabilization control system for a compressed air energy storage power generation system, characterized in that it comprises: an air storage tank; an air intake regulating pipeline, the air intake of the air intake regulating pipeline is connected to the air storage tank; a heating expansion pipeline, which comprises a heating expansion main branch and at least one heating expansion branch, the heating expansion branch comprises a first plate heat exchanger, the gas inlet of the first plate heat exchanger is connected to the air outlet of the air intake regulating pipeline, the gas outlet of the first plate heat exchanger is connected to the air inlet of the first expander inlet regulating valve, the air outlet of the first expander inlet regulating valve is connected to the air inlet of the first expander, and the air outlet of the first expander is respectively connected to the outlet regulating valve of the first expander. The valve is connected in parallel with the air inlet of the first exhaust valve, the air outlet of the first expander outlet regulating valve is connected with the gas inlet of the second plate heat exchanger of the heating and expansion main branch, the gas outlet of the second plate heat exchanger is connected with the air inlet of the second expander inlet regulating valve, the air outlet of the second expander inlet regulating valve is connected with the air inlet of the second expander, the air outlet of the second expander is connected with external equipment, the hot fluid inlet of the second plate heat exchanger and at least one of the first plate heat exchangers is connected with the corresponding second heat exchange valve and the hot fluid outlet of at least one first heat exchange valve on the heating and expansion branch road, the second heat exchange valve and the hot fluid inlet of at least one first heat exchange valve on the heating and expansion branch road are connected with the hot fluid outlet of the heat pump.

[0007] Furthermore, the load rejection stabilization control system includes: a generator, wherein the main shaft of the generator is coaxially arranged with the second expander, and the second expander is coaxially arranged with at least one first expander on the heating and expansion branch line; a speed measuring device, which is arranged on the main shaft of the generator, and is used to obtain 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 is arranged at the air inlet of the second expander, and is used to obtain the real-time temperature of the air inlet of the second expander, and at least one second temperature sensor is arranged at the air inlet of the corresponding first expander, and is used to obtain the real-time temperature of the air inlet of at least one first expander; 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 hot fluid inlet of the heat pump is communicated with the hot fluid outlet of the heat storage tank.

[0009] Furthermore, the cold fluid inlets of the second plate heat exchanger and at least one of the first plate heat exchangers are respectively communicated with a 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 respectively connected to the air inlets of the rush control valve and the power control valve, the air outlets of the rush control valve and the power control valve are respectively connected to the gas inlet of the first plate heat exchanger, and the control terminal is electrically connected to the high-pressure main air valve, the rush control valve and the power control valve, respectively.

[0011] Furthermore, a heat exchange main 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 grid via a grid-connected switch, and when two or more heating and expansion branch paths are provided, the two or more heating and expansion branch paths are respectively arranged in series.

[0013] According to another aspect of an embodiment of the present invention, a load rejection stability control method for a compressed air energy storage power generation system is also provided, which is applied to a control terminal in the load rejection stability control system of the compressed air energy storage power generation system. The method includes:

[0014] In response to the grid-connected switch being disconnected from the power grid, an anti-overspeed control strategy set is generated, and the anti-overspeed 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 a target action, and the target action includes at least one of the following: responding to a target opening and refusing to respond to a target opening.

[0015] Further, in response to the real-time main shaft speed being a first speed, a load shedding speed regulation strategy set is executed, and the load shedding speed regulation strategy set is used to control the rush control valve, the power control valve, the second heat exchange valve, at least one first expander inlet control valve, at least one first expander outlet control valve and at least one first heat exchange valve to perform the target action; in response to the real-time main shaft speed being a second speed, the target action is stopped to wait for receiving a grid connection command again, wherein the first speed is less than the second speed.

[0016] Further, in response to the real-time main shaft speed being the first speed, the load rejection speed regulation strategy set is executed, including: generating a first control strategy in the load rejection speed regulation strategy set in response to a target opening of 1, wherein the first control strategy is used to control the rush control valve, the first expander inlet control valve, the first heat exchange valve and the first exhaust valve to perform the target action; generating a second control strategy in the load rejection speed regulation strategy set in response to a target opening of 0, wherein the second control strategy is used to control the first exhaust valve, and generating an instruction in response to the target opening of 1 to send the first expander outlet control valve, the second expander inlet control valve and the second heat exchange valve to perform the target action respectively.

[0017] By applying the technical solution of the present invention, precise control of the speed of the expander is achieved by controlling the inlet temperature of the expander, so that when a failure or load change occurs in the compressed air energy storage system, the speed can be quickly stabilized to the rated speed, thereby solving the problem that the speed of compressed air energy storage power generation is difficult to quickly stabilize after load shedding. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[0021] 1. Gas storage tank;

[0022] 2. Heat storage tank;

[0023] 3. Cold storage tank;

[0024] 4. The first expander;

[0025] 5. The third expander;

[0026] 6. The fourth expander;

[0027] 7. Second expander;

[0028] 8. The first plate heat exchanger;

[0029] 9. The third plate heat exchanger;

[0030] 10. Fourth plate heat exchanger;

[0031] 11. Second plate heat exchanger;

[0032] 12. Heat exchange main valve;

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

[0034] 14. Rush and turn the regulating valve;

[0035] 15. Power regulating valve;

[0036] 16. The first expander inlet regulating valve;

[0037] 17. The first expander outlet regulating valve;

[0038] 18. The third expander inlet regulating valve;

[0039] 19. Second expander outlet regulating valve;

[0040] 20. Fourth expander inlet regulating valve;

[0041] 21. The third expander outlet regulating valve;

[0042] 22. Second expander inlet regulating valve;

[0043] 23. First exhaust valve;

[0044] 24. Second exhaust valve;

[0045] 25. The third exhaust valve;

[0046] 26. The first heat exchange valve;

[0047] 27. The third heat exchange valve;

[0048] 28. The fourth heat exchange valve;

[0049] 29. Second heat exchange valve;

[0050] 30. Heat pump;

[0051] 31. Generator. DETAILED DESCRIPTION

[0052] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0053] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates 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 and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0055] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in a variety of different forms and should not be construed as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of the present application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the accompanying drawings, for the sake of clarity, the thickness of the layers and regions may be enlarged, and the same reference numerals are used to represent the same devices, and thus their descriptions will be omitted.

[0056] Combination Figure 1 As shown, according to a specific embodiment of the present application, a load rejection stability control system of a compressed air energy storage power generation system is provided, comprising:

[0057] The air tank 1; 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 tank 1, and the air outlet of the high-pressure main air valve 13 is connected to the air inlet of the rush control valve 14 and the power control valve 15 respectively.

[0058] The heating expansion pipeline includes a heating expansion main 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 rush control valve 14 and the power control valve 15. The gas outlet of the first plate heat exchanger 8 is connected to the inlet of the first expander inlet control valve 16. The outlet of the first expander inlet control 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 control valve 17 and the first exhaust valve 23, respectively.

[0059] The gas outlet of the first expander outlet regulating valve 17 is connected to the gas inlet of the second plate heat exchanger 11 of the heating expansion main branch, the gas outlet of the second plate heat exchanger 11 is connected to the gas inlet 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 first plate heat exchanger 8 is respectively connected to the corresponding second heat exchange valve 29 and the hot fluid outlet of at least one first heat exchange valve 26, the hot fluid inlet of the second heat exchange valve 29 and at least one first heat exchange valve 26 is respectively connected to the heat pump 30, and a heat exchange main valve 12 is installed between the hot fluid inlet 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, and is used 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, and is used 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, and is used 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 gas valve 13, the rush 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, and is used to obtain the real-time temperature of the air inlet of the second expander 7 and at least one first expander 4 and the real-time speed of the main shaft of the generator 31, and determine the speed of the main shaft based on the real-time speed of the main shaft and the rated speed. A fixed speed difference is used to generate a target control strategy set based on the speed difference, the real-time temperature of the air inlet of the second expansion machine 7 and the real-time temperature of the air inlet of at least one first expansion machine 4. The target strategy control set is used to control the air intake regulating pipeline, the second heat exchange valve 29, at least one first expansion machine inlet regulating valve 16, the high-pressure main air valve 13, the impulse regulating valve 14 and the power regulating valve 15, at least one first expansion machine outlet regulating valve 17 and at least one of the first heat exchange valves 26 to perform a target action. The target action includes at least one of the following: responding to the target opening and refusing to respond to the target opening.

[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 through a grid-connected switch. When two or more heating and expansion branches are provided, the two or more heating and expansion branches are respectively connected.

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

[0064] At the same time, 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, and 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 main heat exchange valve 12, and the main heat exchange valve 12 is connected to the heat pump 30.

[0065] According to another method for load rejection stability control of a compressed air energy storage power generation system according to one embodiment of the present invention, the method comprises the following steps:

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

[0067] In response to the main shaft real-time speed being the first speed, executing the load rejection speed regulation strategy set, the load rejection speed regulation strategy set is used to control the rush 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 is the target opening of the high-pressure main gas valve 13, the impulse 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] In response to the real-time rotation speed of the main shaft being a second rotation speed, the target action is stopped to wait for receiving a grid connection instruction again, wherein the first rotation speed is less than the second rotation speed, and the second rotation speed is the rated rotation speed.

[0070] The above-mentioned anti-overspeed control strategy includes:

[0071] Generate a response target opening instruction of 0 and send it to the rush control valve 14, the power control valve 15, the second heat exchange valve 29, at least one first expander inlet control valve 16, at least one first expander outlet control valve 17 and at least one first heat exchange valve 26 respectively.

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

[0073] In response to the target opening being 1, a first control strategy in the load rejection speed control strategy set is generated, wherein the first control strategy is used to control the rush control valve 14, the first expander inlet control valve 16, the first heat exchange valve 26 and the first exhaust valve 23 to perform the target action;

[0074] In response to the target opening being 0, a second control strategy in the load rejection speed control strategy set is generated, wherein the second control strategy is used to control the first exhaust valve 23, generating a response target opening instruction of 1 to send the first expander outlet regulating valve 17, the second expander inlet regulating valve 22 and the second heat exchange valve 29 respectively to perform 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 main shaft and the rated speed, obtains the inlet temperature PID control mode through the first temperature sensor and at least one second temperature sensor and compares it with the set value, and controls the working capacity of the compressed air entering the expander by controlling the opening of the heat exchanger flow control valve, thereby achieving the purpose of controlling the speed.

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

[0077]

[0078] Among them: RS is the real-time speed of the spindle, Tm is the time constant of the temperature module, Kp, Ti and Td are the proportional coefficient, integral time and differential 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 regulation strategy also includes: when two or two of the heating and expansion branch circuits are connected, the opening and closing instructions of the valves in the above-mentioned heating and expansion main branch circuits are repeated in sequence until the opening and closing instructions of the valves in the last heating and expansion main branch circuit are executed.

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

[0081] Generate a response target opening instruction of 0 and send it to the rush control valve 14, the power control valve 15, the first expander inlet control valve 16, the first expander outlet control valve 17, the third expander inlet control valve 18, the second expander outlet control valve 19, the fourth expander inlet control valve 20, the third expander outlet control 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 perform the target action.

[0082] In one embodiment of the present invention, the load rejection speed regulation strategy includes:

[0083] In response to the target opening being 1, the command is sent to the impulse regulating valve 14, the first expander inlet regulating valve 16, the first heat exchange valve 26 and the first exhaust valve 23 respectively;

[0084] In response to the target opening of 0, the command is sent to the first exhaust valve 23, and in response to the target opening of 1, the command is sent to 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 to perform the target action respectively;

[0085] In response to the target opening of 0, the second exhaust valve 24 is sent. In response to the target opening of 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 perform the target action respectively.

[0086] In response to the target opening being 0, the third exhaust valve 25 is sent. In response to the target opening being 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 perform target actions respectively.

[0087] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0088] The present invention achieves precise control of the speed of the expander by controlling the inlet temperature of the expander, so that when the compressed air energy storage system fails or changes load, the speed can be quickly stabilized to the rated speed. Through the improved control strategy, it can respond quickly under load shedding conditions, effectively control the expander speed and stabilize it, and improve the safety and reliability of the system. Through the technical solution of the present invention, the CAES system can operate more stably in the face of power grid fluctuations, which plays an important 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 rejection stabilization control method for a compressed air energy storage power generation system is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in an order different from that shown here.

[0090] The method embodiment can be executed in an electronic device or a similar computing device including a memory and a processor. Taking running 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 (CPU), graphics processing units (GPU), digital signal processing (DSP) chips, microprocessors (MCU), programmable logic devices (Field Programmable Gate Array, FPGA), neural network processors (Neural-network Processor Unit, NPU), tensor processors (Tensor Processing Unit, TPU), artificial intelligence (Artificial Intelligence, AI) type processors and other processing devices) and a memory for storing data. Optionally, the above terminal may also include a transmission device, an input and output device, and a display device for communication functions. It can be understood by those of ordinary skill in the art that the above structural description is only illustrative and does not limit the structure of the above terminal. For example, the terminal may also include more or fewer components than the above structural description, or have a configuration different from the above structural description.

[0091] The memory can be used to store computer programs, for example, software programs and modules of application software, such as the computer program corresponding to the load rejection stability control method of the compressed air energy storage power generation system in the embodiment of the present invention. The processor executes various functional applications and data processing by running the computer program stored in the memory, that is, the load rejection stability control method of the compressed air energy storage power generation system mentioned above is realized. The memory may include a high-speed random access memory, and may also include a 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 a memory remotely arranged relative to the processor, and these remote memories may be connected to the mobile terminal via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0092] The transmission device is used to receive or send data via a network. The specific example of the above network may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device includes a network adapter (Network Interface Controller, referred to as NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device can be a radio frequency (Radio Frequency, referred to as RF) module, which is used to communicate with the Internet wirelessly.

[0093] The display device may be, for example, a touch screen type liquid crystal display (LCD) and a touch display (also referred to as a "touch screen" or "touch display screen"). The liquid crystal display may enable a user to interact with a user interface of a mobile terminal. In some embodiments, the mobile terminal has a graphical user interface (GUI), and a user may interact with the GUI by finger contacts and / or gestures on a touch-sensitive surface, wherein the human-computer interaction functions here may optionally include the following interactions: creating web pages, drawing, word processing, making electronic documents, games, video conferencing, instant messaging, sending and receiving emails, call interfaces, playing digital videos, playing digital music and / or web browsing, etc. The executable instructions for executing the above human-computer interaction functions are configured / stored in a computer program product or readable storage medium executable by one or more processors.

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

[0095] In an embodiment of the present invention, a load rejection stabilization control device for a compressed air energy storage power generation system is also provided, which is used to implement the above-mentioned embodiments and preferred implementation modes, and will not be repeated hereafter. As used below, the term "module" can be a combination of software and / or hardware that implements a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

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

[0097] In addition to the above, it should be noted that "one embodiment", "another embodiment", "embodiment", etc. mentioned in this specification refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of the present invention.

[0098] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0099] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A load rejection stability control system for a compressed air energy storage power generation system, characterized in that: include: Gas tank (1); An air intake regulating pipeline, wherein the air intake of the air intake regulating pipeline is connected to the air storage tank (1); A heating expansion pipeline, comprising a heating expansion main branch and at least one heating expansion branch, wherein the heating expansion branch comprises a first plate heat exchanger (8), wherein the gas inlet of the first plate heat exchanger (8) is connected to the gas outlet of the gas inlet regulating pipeline, the gas outlet of the first plate heat exchanger (8) is connected to the gas inlet of a first expander inlet regulating valve (16), the gas outlet of the first expander inlet regulating valve (16) is connected to the gas inlet of a first expander (4), the gas outlet of the first expander (4) is connected in parallel to the gas inlets of a first expander outlet regulating valve (17) and a first exhaust valve (23), respectively, the gas outlet of the first expander outlet regulating valve (17) is connected to the gas inlet of a second plate heat exchanger (1 The gas inlet of the second plate heat exchanger (11) is connected to the gas inlet 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 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) are connected to the corresponding second heat exchange valve (29) and the hot fluid outlet of at least one first heat exchange valve (26) on the heating and expansion branch line, and the hot fluid inlet of the second heat exchange valve (29) and at least one first heat exchange valve (26) on the heating and expansion branch line is connected to the hot fluid outlet of the heat pump (30).

2. The load rejection stability control system of the compressed air energy storage power generation system according to claim 1 is characterized in that: The load rejection stability control system comprises: A generator (31), wherein a main shaft of the generator (31) is coaxially arranged with a second expander (7), and the second expander (7) is coaxially arranged with a first expander (4) on at least one of the heating and expansion branches; A rotation speed measuring device, which is arranged on the main shaft of the generator (31) and is used to obtain the real-time rotation speed of the main shaft of the generator (31); a temperature sensor, comprising a first temperature sensor and at least one second temperature sensor, wherein the first temperature sensor is arranged at the air inlet of the second expander (7) and is used to obtain the real-time temperature of the air inlet of the second expander (7), and at least one second temperature sensor is arranged at the air inlet of the corresponding first expander (4) and is used to obtain the real-time temperature of the air inlet of at least one first expander (4); A 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).

3. The load rejection stability control system of the compressed air energy storage power generation system according to claim 2 is characterized in that: The hot fluid inlet of the heat pump (30) is in communication with the hot fluid outlet of the heat storage tank (2).

4. The load rejection stability control system of the compressed air energy storage power generation system according to claim 3 is 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).

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

6. The load rejection stability control system of the compressed air energy storage power generation system according to claim 5, characterized in that: A heat exchange main 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).

7. A load rejection stability control system for a compressed air energy storage power generation system according to claim 6, characterized in that: The generator (31) is electrically connected to the power grid via a grid-connected switch. When two or more heating and expansion branch paths are provided, the two or more heating and expansion branch paths are respectively arranged in series.

8. A load rejection stability control method for a compressed air energy storage power generation system, applied to a control terminal in a load rejection stability control system for a compressed air energy storage power generation system according to claim 6, characterized in that: The method comprises: In response to the grid-connected switch being disconnected from the power grid, an anti-overspeed control strategy set is generated, wherein the anti-overspeed control strategy set 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 a target action, wherein the target action includes at least one of the following: responding to a target opening and refusing to respond to a target opening.

9. A load rejection stability control method for a compressed air energy storage power generation system according to claim 8, characterized in that: In response to the main shaft real-time speed being a first speed, executing a load rejection speed regulation strategy set, wherein the load rejection speed regulation strategy set is used to control the rush control valve (14), the power control valve (15), the second heat exchange valve (29), at least one first expander inlet control valve (16), at least one first expander outlet control valve (17) and at least one first heat exchange valve (26) to perform the target action; In response to the real-time rotation speed of the main shaft being a second rotation speed, the target action is stopped to wait for receiving a grid connection instruction again, wherein the first rotation speed is less than the second rotation speed.

10. The load rejection stability control method of the compressed air energy storage power generation system according to claim 9, characterized in that: In response to the real-time speed of the main shaft being the first speed, executing the load rejection speed adjustment strategy set, including: In response to the target opening being 1, a first control strategy in the load rejection speed control strategy set is generated, wherein the first control strategy is used to control the rush control valve (14), the first expander inlet control valve (16), the first heat exchange valve (26) and the first exhaust valve (23) to perform the target action; In response to the target opening being 0, a second control strategy in the load rejection speed control strategy set is generated, wherein the second control strategy is used to control the first exhaust valve (23), and generates a command in response to the target opening being 1 to send the first expander outlet control valve (17), the second expander inlet control valve (22) and the second heat exchange valve (29) to perform the target action.

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