Compressed air energy storage system and control method thereof

Abstract

This specification relates to the field of electric energy storage technology, and in particular to a compressed air energy storage system and a control method thereof. The compressed air energy storage system may include: a main pipeline, connected to the main gas storage reservoir, for conveying the compressed air in the main gas storage reservoir to the power generation component; an auxiliary pipeline, connected to the auxiliary gas storage reservoir, for conveying the compressed air in the auxiliary gas storage reservoir to the power generation component; a power generation component, connected to the main pipeline and the auxiliary pipeline, for generating electricity only through the compressed air in the main gas storage reservoir when the compressed air in the main gas storage reservoir meets the first power generation condition; when the compressed air in the main gas storage reservoir does not meet the first power generation condition, generating electricity through the compressed air in the main gas storage reservoir and the compressed air in the auxiliary gas storage reservoir. The embodiment of this specification adds an auxiliary pipeline on the basis of the main pipeline, thereby realizing the addition of an auxiliary gas storage reservoir as a supplement on the basis of the main gas storage reservoir, thereby increasing the duration of power output.

Description

Technical Field

[0001] The present specification relates to the field of electric energy storage technology, and in particular to a compressed air energy storage system and a control method thereof. Background Art

[0002] With the large-scale use of new energy, energy storage has become an indispensable part of the global energy transformation process. Especially in scenarios such as large-scale energy bases, large-scale, long-term, efficient, and low-cost energy storage technology support is needed. Among the many energy storage technologies, it is generally believed that compressed air energy storage systems are obviously one of the most competitive large-scale power energy storage technology routes.

[0003] In the prior art, air can be sucked from the environment by an air compressor, compressed to a high pressure state and stored in an air storage reservoir. Then, power generation is performed using the compressed air in the air storage reservoir. However, the amount of compressed air stored in an air storage reservoir is limited. As a result, the power generation process is short and power output cannot be guaranteed for a long time. Summary of the invention

[0004] The embodiments of this specification provide a compressed air energy storage system and a control method thereof, which are used to increase the duration of power output.

[0005] The embodiment of this specification provides a compressed air energy storage system, including:

[0006] A main pipeline is connected to the main gas storage reservoir and is used to transport the compressed air in the main gas storage reservoir to the power generation component;

[0007] An auxiliary pipeline is connected to the auxiliary gas storage reservoir and is used to transport the compressed air in the auxiliary gas storage reservoir to the power generation component;

[0008] The power generation component is connected to the main pipeline and the auxiliary pipeline, and is used for generating electricity only by the compressed air in the main gas storage reservoir when the compressed air in the main gas storage reservoir meets the first power generation condition; when the compressed air in the main gas storage reservoir does not meet the first power generation condition, generating electricity by the compressed air in the main gas storage reservoir and the compressed air in the auxiliary gas storage reservoir.

[0009] The embodiment of this specification also provides a control method for a compressed air energy storage system, wherein the compressed air energy storage system includes a main pipeline, an auxiliary pipeline and a power generation component, wherein the main pipeline is connected to a main gas storage reservoir and is used to transport the compressed air in the main gas storage reservoir to the power generation component, and the auxiliary pipeline is connected to an auxiliary gas storage reservoir and is used to transport the compressed air in the auxiliary gas storage reservoir to the power generation component, wherein the power generation component is used to generate electricity through compressed air; the control method includes:

[0010] The power generation component generates electricity through compressed air in the main gas storage reservoir;

[0011] When it is detected that the power generation power of the power generation component is less than the first set threshold value, the power generation component is enabled to generate electricity through the compressed air in the main gas storage reservoir and the compressed air in the auxiliary gas storage reservoir.

[0012] The embodiments of the present specification also provide a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above control method when executing the computer program.

[0013] The embodiments of the present specification also provide a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and the computer program implements the above control method when executed by a processor.

[0014] The embodiments of the present specification also provide a computer program product, wherein the computer program product includes a computer program, and the computer program implements the above control method when executed by a processor.

[0015] The compressed air energy storage system of the embodiment of this specification adds an auxiliary pipeline on the basis of the main pipeline, thereby realizing the addition of an auxiliary gas storage reservoir as a supplement on the basis of the main gas storage reservoir, thereby extending the power generation process, so that the compressed air energy storage system can output electricity for a long time. It solves the system problems that may occur in the prior art, such as the gas source of a single gas storage reservoir cannot reach the rated power generation, the full-power power generation process is short, and the power generation efficiency of the compressed air energy storage system is low. In addition, under the condition that the main gas storage reservoir and the auxiliary gas storage reservoir are salt cavern gas storage reservoirs, the underground salt caverns that do not meet the set gas storage conditions can be fully utilized to improve the utilization rate of underground salt cavern resources, reduce the transformation cost of underground salt caverns, and improve power generation capacity, thereby increasing the income of the power station. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. The drawings described below are only some embodiments recorded in this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 This is a functional structure diagram of a compressed air energy storage system in an embodiment of this specification;

[0018] Figure 2 Schematic diagram of the control method of the compressed air energy storage system in the embodiment of this specification.

[0019] [Description of Reference Numerals]

[0020] 1. Main pipeline; 11. First switch valve; 12. Check valve; 13. Switch valve; 14. Heat exchanger; 15. Switch valve; 16. Gas regulating valve; 2. Auxiliary pipeline; 21. Second switch valve; 22. Check valve; 23. Switch valve; 24. Heat exchanger; 25. Switch valve; 26. Gas regulating valve; 3. Connecting pipeline; 31. Third switch valve; 41. Expander; 42. Generator; 5. Main gas storage reservoir; 6. Auxiliary gas storage reservoir. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, rather than all of the embodiments. The specific embodiments described herein are only used to explain the present disclosure, rather than to limit the present disclosure. Based on the described embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art are within the scope of protection of the present disclosure. In addition, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0022] Focusing on the strategic goal of the new power system, the development of renewable clean energy has become a trend in the energy field. Energy storage technology can smooth the output fluctuations of wind and solar power sources, improve and connect network users, and has become one of the key technologies to support the construction of new power systems. It has entered an important period of research and development and application, among which the demand for large-scale long-term energy storage technology is particularly urgent. Compressed air energy storage is an important form of energy storage. It is another technology suitable for large-scale power energy storage besides pumped storage. In addition to high storage energy, it also has the advantages of high energy density and power density, low operating cost and long service life. Taking the storage of electric energy as an example, the compressed air energy storage system can be mainly divided into two basic working processes: energy storage and energy release. When storing energy, the motor drives the air compressor to absorb air from the environment, compress it to a high pressure state and store it in the gas storage reservoir. In this process, the electric energy is converted into the internal energy of the compressed air; when releasing energy, the compressed air stored in the gas storage reservoir enters the power generation component to expand and generate electricity, and the internal energy and potential energy contained in the compressed air are converted back into electric energy.

[0023] Underground salt cavern gas storage has the advantages of small space occupation, relatively stable performance, large capacity, and low construction cost. A salt cavern gas storage can be formed by transforming the underground salt cavern. When the actual pressure range of the underground salt cavern is lower than the set pressure range, or the available space of the underground salt cavern is less than the set value, the underground salt cavern does not meet the set gas storage conditions, and the power generation components cannot achieve the set power generation. In practice, in addition to underground salt caverns that meet the set gas storage conditions, there are also underground salt caverns that do not meet the set gas storage conditions. How to make full use of underground salt caverns that do not meet the set gas storage conditions is also a technical problem that needs to be solved urgently.

[0024] See also Figure 1 The embodiments of this specification provide a compressed air energy storage system.

[0025] In some embodiments, the compressed air energy storage system may include a plurality of main pipelines 1, auxiliary pipelines 2, connecting pipelines 3, power generation components and control devices. The main pipeline 1 is connected to the main gas reservoir 5, and is used to transport the compressed air in the main gas reservoir 5 to the power generation components. The auxiliary pipeline 2 is connected to the auxiliary gas reservoir 6, and is used to transport the compressed air in the auxiliary gas reservoir 6 to the power generation components. The connecting pipeline 3 is used to connect the main pipeline 1 and the auxiliary pipeline 2. The power generation component is used to generate electricity through compressed air, for example, generating electricity only through the compressed air in the main gas reservoir 5, or generating electricity through the compressed air in the main gas reservoir 5 and the auxiliary gas reservoir 6 at the same time.

[0026] In some embodiments, a first switch valve 11 may be provided on the main pipeline 1. The first switch valve 11 is used to control the connection and disconnection between the main pipeline 1 and the power generation component. A second switch valve 21 may be provided on the auxiliary pipeline 2. The second switch valve 21 is used to control the connection and disconnection between the auxiliary pipeline 2 and the power generation component. A third switch valve 31 may be provided on the connecting pipeline 3. The third switch valve 31 is used to control the connection and disconnection between the main pipeline 1 and the auxiliary pipeline 2. The first switch valve 11, the second switch valve 21 and the third switch valve 31 may all have an open state and a closed state. The control device may include a host computer for controlling the switch states of the first switch valve 11, the second switch valve 21 and the third switch valve 31.

[0027] Of course, other components may also be arranged on the main pipeline 1, and the control device may control the other components.

[0028] For example, a check valve 12, a switch valve 13, a heat exchanger 14, a switch valve 15, and an air regulating valve 16 may be provided on the main pipeline 1. The check valve 12 is used to prevent gas backflow. The heat exchanger 14 is used to heat the gas. The switch valve 13 and the switch valve 15 are used to control the connection and disconnection between the heat exchanger 14 and the main pipeline 1, so as to facilitate the maintenance of the heat exchanger 14. The air regulating valve 16 is used to adjust the intake volume and pressure.

[0029] For example, the control device can collect the pressure signal of the gas at the inlet of the power generation component (such as the expander), and can adjust the opening of the gas regulating valve 16 according to the pressure signal to maintain the intake pressure at the rated pressure value. As the pressure of the compressed air in the main line 1 continues to decrease to the rated pressure, the opening of the gas regulating valve 16 continues to increase until it is fully opened, so that the power generation power of the power generation component is constant.

[0030] Of course, other components may also be provided on the auxiliary pipeline 2, and the control device may control the other components.

[0031] For example, a check valve 22, a switch valve 23, a heat exchanger 24, a switch valve 25, and an air regulating valve 26 may be provided on the auxiliary pipeline 2. The check valve 22 is used to prevent gas backflow. The heat exchanger 24 is used to heat the gas. The switch valve 23 and the switch valve 25 are used to control the connection and disconnection between the heat exchanger 24 and the auxiliary pipeline 2, so as to facilitate the maintenance of the heat exchanger 24. The air regulating valve 26 is used to adjust the intake volume and pressure.

[0032] For example, the control device can collect the pressure signal of the gas at the inlet of the power generation component (such as the expander), and adjust the opening of the gas regulating valve 26 according to the pressure signal to maintain the intake pressure at the rated pressure value. As the pressure of the compressed gas in the auxiliary pipeline 2 continues to decrease to the rated pressure, the opening of the gas regulating valve 26 continues to increase until it is fully opened, so that the power generation power of the power generation component is constant.

[0033] In some embodiments, the auxiliary gas storage reservoir 6 can be used as a supplementary gas storage reservoir for the main gas storage reservoir 5. Compared with the main gas storage reservoir 5, the auxiliary gas storage reservoir 6 can be a small gas storage reservoir. For example, the capacity of the auxiliary gas storage reservoir 6 is smaller than that of the main gas storage reservoir 5. The upper limit value of the pressure of the compressed air in the auxiliary gas storage reservoir 6 is lower than that of the main gas storage reservoir 5. For example, the upper limit value of the pressure of the compressed air in the main gas storage reservoir 5 is higher than the rated pressure of the power generation component, and the power generation component can generate electricity only by the compressed air in the main gas storage reservoir 5; the upper limit value of the pressure of the compressed air in the auxiliary gas storage reservoir 6 is lower than the rated pressure of the power generation component, and the power generation component cannot generate electricity only by the compressed air in the auxiliary gas storage reservoir 6.

[0034] In some examples, the compressed air in the main gas storage reservoir 5 meets the power generation demand of the power generation component. The compressed air in the auxiliary gas storage reservoir 6 does not meet the power generation demand. The sum of the compressed air in the main gas storage reservoir 5 and the auxiliary gas storage reservoir 6 meets the power generation demand of the power generation component.

[0035] In some examples, the main gas storage reservoir 5 and the auxiliary gas storage reservoir 6 may be salt cavern gas storage reservoirs. For example, the main gas storage reservoir 5 may be an underground salt cavern that meets the gas storage conditions, specifically with a higher actual pressure and available space. The auxiliary gas storage reservoir 6 may be an underground salt cavern that does not meet the gas storage conditions, specifically with a lower actual pressure and available space. Thus, the underground salt caverns are fully utilized.

[0036] In some embodiments, the power generation component may include an expander 41 and a generator 42. The expander 41 is used to convert the potential energy in the compressed air into mechanical energy. For example, the expander 41 can use compressed air to enter the expander 41 under high pressure and expand to low pressure. The high-pressure and low-speed gas is changed into low-pressure and high-speed gas, thereby driving the rotor of the expander 41 to rotate, thereby converting the potential energy in the compressed air into mechanical energy. The generator 42 is used to convert the mechanical energy output by the expander into electrical energy, for example, it can generate electricity driven by the rotor of the expander 41.

[0037] In some embodiments, the power generation component may be in communication with the main pipeline 1 and the auxiliary pipeline 2 .

[0038] When the compressed air in the main gas storage reservoir 5 meets the first power generation condition, the power generation component can generate electricity only through the compressed air in the main gas storage reservoir 5. When the compressed air in the main gas storage reservoir 5 does not meet the first power generation condition, the power generation component can generate electricity through the compressed air in the main gas storage reservoir 5 and the compressed air in the auxiliary gas storage reservoir 6. For example, when the compressed air in the main gas storage reservoir 5 does not meet the first power generation condition, and the sum of the compressed air in the main gas storage reservoir 5 and the auxiliary gas storage reservoir 6 meets the second power generation condition, the power generation component can generate electricity through the compressed air in the main gas storage reservoir 5 and the compressed air in the auxiliary gas storage reservoir 6. When the sum of the compressed air in the main gas storage reservoir 5 and the auxiliary gas storage reservoir 6 does not meet the second power generation condition, the power generation component can end power generation.

[0039] In this way, by adding an auxiliary pipeline 2 on the basis of the main pipeline 1, it is possible to add an auxiliary gas storage reservoir 6 as a supplement on the basis of the main gas storage reservoir 5, thereby extending the power generation process and enabling the compressed air energy storage system to output electricity for a long time. This solves system problems that may occur in the prior art, such as the gas source of a single gas storage reservoir cannot reach the rated power generation capacity, the full-power power generation process is short, and the power generation efficiency of the compressed air energy storage system is low. In addition, under the condition that the main gas storage reservoir 5 and the auxiliary gas storage reservoir 6 are salt cavern gas storage reservoirs, it is also possible to make full use of underground salt caverns that do not meet the set gas storage conditions, improve the utilization rate of underground salt cavern resources, reduce the transformation cost of underground salt caverns, and improve power generation capacity, thereby increasing the income of the power station.

[0040] Among them, the first power generation condition may include: the power generation power of the power generation component can reach the first set threshold. The first set threshold may include, for example, the rated power generation power. The compressed air in the main gas storage reservoir 5 satisfies the first power generation condition, which may include: when the power generation component generates power only through the compressed air in the main gas storage reservoir 5, the power generation power is greater than or equal to the first set threshold. The compressed air in the main gas storage reservoir 5 does not meet the first power generation condition, which may include: when the power generation component generates power only through the compressed air in the main gas storage reservoir 5, the power generation power is less than the first set threshold. The second power generation condition may include: the power generation power of the power generation component can reach the second set threshold. The second set threshold may be less than the first set threshold, for example, less than the rated power generation power. The compressed air in the main gas storage reservoir 5 and the auxiliary gas storage reservoir 6 satisfies the second power generation condition, which may include: when the power generation component generates power through the compressed air in the main gas storage reservoir 5 and the auxiliary gas storage reservoir 6, the power generation power is greater than or equal to the second set threshold. The compressed air in the main gas storage reservoir 5 and the auxiliary gas storage reservoir 6 does not meet the second power generation condition, which may include: when the power generation component generates electricity through the compressed air in the main gas storage reservoir 5 and the auxiliary gas storage reservoir 6, the power generation power is less than the second set threshold.

[0041] The main gas storage reservoir 5 and the auxiliary gas storage reservoir 6 may be filled with compressed air. The working process of the compressed air energy storage system is described below.

[0042] (1) In the energy-saving full-generation stage, the compressed air in the main gas storage reservoir 5 meets the first power generation condition. The control device can control the first switch valve 11 to be in an open state, and can control the second switch valve 21 and the third switch valve 31 to be in a closed state. In this way, the compressed air in the main gas storage reservoir 5 can be transported to the power generation component through the main pipeline 1. The compressed air in the auxiliary gas storage reservoir 6 cannot be transported to the power generation component, thereby saving the compressed air in the auxiliary gas storage reservoir 6, which is conducive to extending the power generation time.

[0043] The power generation component can generate electricity through the compressed air input from the main pipeline 1, thereby achieving full power generation.

[0044] As the power generation time increases, the compressed air in the main gas storage reservoir 5 gradually decreases, and the pressure of the compressed air in the main pipeline 1 gradually decreases. The pressure of the compressed air in the main pipeline 1 gradually decreases, causing the power generation of the power generation component to gradually decrease. The control device can monitor the power generation of the power generation component. When the power generation of the power generation component is less than the first set threshold, it indicates that the compressed air in the main gas storage reservoir 5 does not meet the first power generation condition, and the compressed air energy storage system enters the first sub-stage of the air replenishment full generation stage.

[0045] (2) In the first sub-stage of the air replenishment and full generation stage, the control device can control the first switch valve 11 and the third switch valve 31 to be in an open state, and can control the second switch valve 21 to be in a closed state. In this way, the compressed air in the main air storage reservoir 5 can be transported to the power generation component through the main pipeline 1. At the same time, the compressed air in the auxiliary air storage reservoir 6 can be transported to the power generation component through the connecting pipeline 3 and the main pipeline 1. The power generation component can generate electricity through the compressed air input from the main pipeline 1. As a result, the power generation component can generate electricity through the compressed air in the main air storage reservoir 5 and the compressed air in the auxiliary air storage reservoir 6 at the same time. In this way, air replenishment through the auxiliary air storage reservoir 6 can make the power generation power of the power generation component reach the first set threshold again, thereby achieving full power generation. In addition, by transporting compressed air to the power generation component through a pipeline (main pipeline 1), the amount of compressed air transported can also be saved, which is conducive to extending the power generation time.

[0046] As the power generation time increases, the compressed air in the main gas storage reservoir 5 and the auxiliary gas storage reservoir 6 gradually decreases, causing the pressure of the compressed air in the main pipeline 1 to gradually decrease. The pressure of the compressed air in the main pipeline 1 gradually decreases, thereby causing the power generation of the power generation component to gradually decrease. The control device can monitor the power generation of the power generation component. When the power generation of the power generation component is less than the first set threshold, the compressed air energy storage system enters the second sub-stage of the full-gas replenishment stage.

[0047] (3) In the second sub-stage of the air replenishment and full generation stage, the compressed air input by the main pipeline 1 does not meet the first power generation condition. The control device can control the first switch valve 11 and the second switch valve 21 to be in an open state, and can control the third switch valve 31 to be in a closed state. In this way, the compressed air in the main gas storage reservoir 5 can be transported to the power generation component through the main pipeline 1. At the same time, the compressed air in the auxiliary gas storage reservoir 6 can be transported to the power generation component through the auxiliary pipeline 2. The power generation component can generate electricity through the compressed air input by the main pipeline 1 and the compressed air input by the auxiliary pipeline 2. In this way, by transporting compressed air to the power generation component through multiple pipelines (main pipeline 1 and auxiliary pipeline 2), the amount of compressed air transported to the power generation component can be increased, so that the power generation power of the power generation component can reach the first set threshold again, thereby achieving full power generation.

[0048] As the power generation time increases, the compressed air in the main gas storage reservoir 5 and the auxiliary gas storage reservoir 6 gradually decreases, causing the pressure of the compressed air in the main pipeline 1 and the auxiliary pipeline 2 to gradually decrease. The pressure of the compressed air in the main pipeline 1 and the auxiliary pipeline 2 gradually decreases, causing the power generation of the power generation component to gradually decrease. The control device can monitor the power generation power of the power generation component. When the power generation power of the power generation component is less than the first set threshold, it indicates that the sum of the compressed air in the main gas storage reservoir 5 and the auxiliary gas storage reservoir 6 does not meet the first power generation condition, and full-power power generation cannot be achieved, and the compressed air energy storage system enters the stage of air replenishment and non-full power generation.

[0049] (4) In the stage of insufficient generation of gas, the control device can keep the first switch valve 11 and the second switch valve 21 in an open state, and can keep the third switch valve 31 in a closed state. In this way, although the power generation power of the power generation component is less than the first set threshold, the power generation component can still continue to generate electricity, so as to make full use of the compressed air in the main gas storage reservoir 5 and the auxiliary gas storage reservoir 6.

[0050] In the stage of insufficient power generation due to air replenishment, the sum of the compressed air in the main gas storage reservoir 5 and the auxiliary gas storage reservoir 6 does not meet the first power generation condition, but meets the second power generation condition. The control device can monitor the power generation power of the power generation component. When the power generation power of the power generation component is less than the second set threshold, it means that the sum of the compressed air in the main gas storage reservoir 5 and the auxiliary gas storage reservoir 6 does not meet the second power generation condition, and the power output by the power generation component can no longer meet the requirements. The control device can close the first switch valve 11, the second switch valve 21 and the third switch valve 31. In this way, the compressed air in the main gas storage reservoir 5 and the auxiliary gas storage reservoir 6 cannot be input into the power generation component, and the power generation component can stop power generation.

[0051] In some embodiments, the number of main pipelines 1 may be 1, which is connected to 1 main gas storage reservoir 5. The number of auxiliary pipelines 2 may be N, which are connected to N auxiliary gas storage reservoirs 6, and are used to transport the compressed air in the N auxiliary gas storage reservoirs 6 to the power generation components. Each auxiliary pipeline 2 may be connected to 1 auxiliary gas storage reservoir 6, and is used to transport the compressed air in 1 auxiliary gas storage reservoir 6 to the power generation components. The number of connecting pipelines 3 may be N. The N connecting pipelines 3 are used to connect the main pipeline 1 and N auxiliary pipelines 2. Each connecting pipeline 3 is used to connect the main pipeline 1 and 1 auxiliary pipeline 2. In this way, each connecting pipeline 3 can correspond to one auxiliary pipeline 2.

[0052] The N is a natural number greater than or equal to 1. For example, N is 1, 2, 3, etc.

[0053] The control device can control the components in the N auxiliary pipelines 2 (for example, the switching state of the second switching valve 21).

[0054] A specific example is described below.

[0055] The control device may execute the energy-saving full-generation phase (1). The control device may monitor the power generation of the power generation component. When the power generation of the power generation component is less than a first set threshold, the control device may execute the following iterative steps.

[0056] The control device may select an auxiliary pipeline 2 from the N auxiliary pipelines 2. For the selected auxiliary pipeline 2, the control device may execute the first sub-stage (2) of the gas replenishment and full-fire stage and the second sub-stage (3) of the gas replenishment and full-fire stage. The control device may monitor the power generation of the power generation component. When the power generation of the power generation component is less than the first set threshold, the control device may close the second switch valve 21 in the auxiliary pipeline 2 and the third switch valve 31 in the corresponding connecting pipeline 3.

[0057] The control device can reselect an auxiliary pipeline 2 from the remaining auxiliary pipelines 2, thereby iteratively executing the above steps. Until all N auxiliary pipelines 2 are selected. Then the control device can open the second switch valve 21 of the N auxiliary pipelines 2 and close the third switch valve 31 of the N connecting pipelines 3, so that the power generation component can generate electricity through the compressed air in the main gas storage reservoir 5 and the N auxiliary gas storage reservoirs 6 at the same time. The control device can monitor the power generation power of the power generation component. When the power generation power of the power generation component is less than the second set threshold, that is, when the sum of the compressed air in the main gas storage reservoir 5 and the N auxiliary gas storage reservoirs 6 does not meet the second power generation condition, the first switch valve 11 and the second switch valve 21 of the N auxiliary pipelines 2 can be closed. In this way, the power generation component can stop generating electricity.

[0058] See also Figure 2 Based on the compressed air energy storage system, the embodiment of this specification also provides a control method accordingly.

[0059] The control method may include the following steps.

[0060] Step 21: Enable the power generation component to generate electricity through the compressed air in the main gas storage reservoir.

[0061] In some embodiments, when the compressed air energy storage system starts to generate electricity, the main pipeline can be opened; the auxiliary pipeline and the connecting pipeline can be closed. In this way, the compressed air in the main air storage reservoir can be transported to the power generation component through the main pipeline. The power generation component can generate electricity only through the compressed air in the main air storage reservoir. For example, the control device can control the first switch valve to be in an open state, and can control the second switch valve and the third switch valve to be in a closed state. In this way, the compressed air in the main air storage reservoir can be transported to the power generation component through the main pipeline. The compressed air in the auxiliary air storage reservoir cannot be transported to the power generation component, which can save the compressed air in the auxiliary air storage reservoir and help extend the power generation time.

[0062] In some embodiments, when the power generation component generates electricity only through the compressed air in the main gas storage reservoir, as the power generation time increases, the compressed air in the main gas storage reservoir gradually decreases, causing the pressure of the compressed air in the main pipeline to gradually decrease. The pressure of the compressed air in the main pipeline gradually decreases, causing the power generation of the power generation component to gradually decrease. For this purpose, the control device can monitor the power generation of the power generation component. In order to timely control and adjust the compressed air energy storage system, the power generation of the power generation component can continue to reach the first set threshold. The compressed air energy storage system is in the energy-saving full-generation stage.

[0063] Step 22: When it is detected that the power generation power of the power generation component is less than the first set threshold value, the power generation component is enabled to generate electricity through the compressed air in the main gas storage reservoir and the compressed air in the auxiliary gas storage reservoir.

[0064] In some embodiments, when the control device detects that the power generation of the power generation component is less than the first set threshold, the power generation component can generate electricity through the compressed air in the main gas storage reservoir and the auxiliary gas storage reservoir. In this way, the power generation of the power generation component can reach the first set threshold again by replenishing air through the auxiliary gas storage reservoir. The compressed air energy storage system is in the full generation stage of replenishing air.

[0065] In some embodiments, when it is detected that the power generation power of the power generation component is less than the first set threshold value, the main pipeline and the connecting pipeline can be opened and the auxiliary pipeline can be closed, so that the compressed air in the main gas storage reservoir is transported to the power generation component through the main pipeline, and the compressed air in the auxiliary gas storage reservoir is transported to the power generation component through the connecting pipeline and the main pipeline. In this way, the power generation component can generate electricity through the compressed air input by the main pipeline. For example, the control device can control the first switch valve and the third switch valve to be in an open state, and can control the second switch valve to be in a closed state. In this way, the compressed air in the main gas storage reservoir can be transported to the power generation component through the main pipeline, and the compressed air in the auxiliary gas storage reservoir can be transported to the power generation component through the connecting pipeline and the main pipeline. By replenishing air through the auxiliary gas storage, the power generation power of the power generation component can reach the first set threshold value again. In addition, by transporting compressed air to the power generation component through a pipeline (main pipeline), the amount of compressed air transported can also be saved, which is conducive to extending the power generation time.

[0066] When the power generation component generates electricity through the compressed air input from the main pipeline, as the power generation time increases, the compressed air in the main gas storage reservoir and the auxiliary gas storage reservoir gradually decreases, causing the pressure of the compressed air in the main pipeline to gradually decrease. The pressure of the compressed air in the main pipeline gradually decreases, so that the power generation of the power generation component gradually decreases. For this purpose, the control device can monitor the power generation of the power generation component. In order to timely control and adjust the compressed air energy storage system, the power generation of the power generation component can continue to reach the first set threshold.

[0067] When it is detected that the power generation power of the power generation component is less than the first set threshold value, the main pipeline and the auxiliary pipeline can be opened and the connecting pipeline can be closed, so that the compressed air in the main gas storage reservoir is transported to the power generation component through the main pipeline, and the compressed air in the auxiliary gas storage reservoir is transported to the power generation component through the auxiliary pipeline. In this way, the power generation component can generate electricity through the compressed air input by the main pipeline and the compressed air input by the auxiliary pipeline. For example, the control device can control the first switch valve and the second switch valve to be in an open state, and can control the third switch valve to be in a closed state. In this way, the compressed air in the main gas storage reservoir can be transported to the power generation component through the main pipeline, and the compressed air in the auxiliary gas storage reservoir can be transported to the power generation component through the auxiliary pipeline. In this way, by transporting compressed air to the power generation component through multiple pipelines (main pipeline and auxiliary pipeline), the amount of compressed air transported to the power generation component can be increased, so that the power generation power of the power generation component can reach the first set threshold value again.

[0068] In some embodiments, when the power generation component generates electricity through compressed air input from the main pipeline and the auxiliary pipeline, as the power generation time increases, the compressed air in the main gas storage reservoir and the auxiliary gas storage reservoir gradually decreases, so that the pressure of the compressed air in the main pipeline and the auxiliary pipeline gradually decreases. The pressure of the compressed air in the main pipeline and the auxiliary pipeline gradually decreases, so that the power generation power of the power generation component gradually decreases. For this purpose, the control device can monitor the power generation power of the power generation component. When it is detected that the power generation power of the power generation component is less than the second set threshold, the main pipeline, the auxiliary pipeline and the connecting pipeline can be closed to stop the power generation of the power generation component. For example, the control device can control the first switch valve, the second switch valve and the third switch valve to be in the off state so that the power generation component stops generating electricity.

[0069] The control method of the embodiment of this specification can enable the power generation component to generate electricity through the compressed air in the main gas storage reservoir; when it is detected that the power generation power of the power generation component is less than the first set threshold, the power generation component can generate electricity through the compressed air in the main gas storage reservoir and the compressed air in the auxiliary gas storage reservoir, so that the power generation power of the power generation component reaches the first set threshold again. By adding an auxiliary pipeline on the basis of the main pipeline, the auxiliary gas storage reservoir is added as a supplement on the basis of the main gas storage reservoir, so that the power generation process can be extended, so that the compressed air energy storage system can output electricity for a long time. It solves the system problems that the gas source of a single gas storage reservoir cannot reach the rated power generation capacity, the full power power generation process is short, and the power generation efficiency of the compressed air energy storage system is low. In addition, under the condition that the main gas storage reservoir and the auxiliary gas storage reservoir are salt cavern gas storage reservoirs, the underground salt caverns that do not meet the set gas storage conditions can be fully utilized to improve the utilization rate of underground salt cavern resources, reduce the transformation cost of underground salt caverns, and improve the power generation capacity, thereby increasing the power station revenue. In addition, the compressed air energy storage system can meet the power generation requirements under various working conditions through the cooperation of multiple working stages, and achieve the stability of the power generation output of the unit.

[0070] Based on the compressed air energy storage system, the embodiments of this specification also provide a control device accordingly.

[0071] The control device may include the following units.

[0072] A first power generation unit, used to enable the power generation component to generate electricity through compressed air in the main gas storage reservoir;

[0073] The second power generation unit is used to enable the power generation component to generate electricity through the compressed air in the main gas storage reservoir and the compressed air in the auxiliary gas storage reservoir when it is detected that the power generation power of the power generation component is less than the first set threshold.

[0074] The embodiments of the present specification also provide a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above control method when executing the computer program.

[0075] The embodiments of the present specification also provide a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and the computer program implements the above control method when executed by a processor.

[0076] The embodiments of the present specification also provide a computer program product, wherein the computer program product includes a computer program, and the computer program implements the above control method when executed by a processor.

[0077] Those skilled in the art will appreciate that this specification may be provided as a method, system, or computer program product. Therefore, this specification may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, this specification may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0078] This specification is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products of the embodiments of this specification. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. The computer can be a personal computer, a laptop computer, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

[0079] The various functional units in the embodiments of this specification may be integrated into one processing unit, or each functional unit may exist physically separately, or two or more functional units may be integrated into one processing unit.

[0080] Those skilled in the art will understand that the description of each embodiment in this specification has its own emphasis. For parts not described in detail in a certain embodiment, reference can be made to the relevant description of other embodiments. In addition, it is understood that after reading this specification, those skilled in the art can think of any combination of some or all of the embodiments listed in this specification without creative work, and these combinations are also within the scope of disclosure and protection of this specification.

[0081] Although the present specification is described by way of examples, it is known to those skilled in the art that the above examples are only used to help understand the core idea of ​​the present specification. It is understood by those skilled in the art that there are many variations and changes in the present specification. It is hoped that the appended claims include these variations and changes without departing from the spirit of the present specification.

Claims

1. A compressed air energy storage system, characterized in that: include: A main pipeline is connected to the main gas storage reservoir and is used to transport the compressed air in the main gas storage reservoir to the power generation component; An auxiliary pipeline is connected to the auxiliary gas storage reservoir and is used to transport the compressed air in the auxiliary gas storage reservoir to the power generation component; A power generation component is connected to the main pipeline and the auxiliary pipeline, and is used to generate electricity only through the compressed air in the main gas storage when the compressed air in the main gas storage meets the first power generation condition; when the compressed air in the main gas storage does not meet the first power generation condition, generate electricity through the compressed air in the main gas storage and the compressed air in the auxiliary gas storage; A first switch valve is arranged on the main pipeline, and the first switch valve is used to control the connection and disconnection between the main pipeline and the power generation component; a second switch valve is arranged on the auxiliary pipeline, and the second switch valve is used to control the connection and disconnection between the auxiliary pipeline and the power generation component; the system also includes a connecting pipeline and a control device; the connecting pipeline is used to connect the main pipeline and the auxiliary pipeline; a third switch valve is arranged on the connecting pipeline; the third switch valve is used to control the connection and disconnection between the main pipeline and the auxiliary pipeline; The control device monitors the power generation of the power generation component in the energy-saving full-generation stage, and when the power generation of the power generation component is less than a first set threshold, controls the compressed air energy storage system to enter the first sub-stage of the air replenishment full-generation stage; In the first sub-stage of the air replenishment and full generation stage, the control device controls the first switch valve and the third switch valve to be in an open state, and controls the second switch valve to be in a closed state, so that the compressed air in the main air storage reservoir is transported to the power generation component through the main pipeline, and the compressed air in the auxiliary air storage reservoir is transported to the power generation component through the connecting pipeline and the main pipeline, and the power generation component generates electricity through the compressed air input from the main pipeline, and the power generation power of the power generation component reaches the first set threshold again; The control device monitors the power generation power of the power generation component in the first sub-stage of the gas replenishment and full generation stage, and controls the compressed air energy storage system to enter the second sub-stage of the gas replenishment and full generation stage when the power generation power is less than the first set threshold value; In the second sub-stage of the air replenishment and full generation stage, the control device controls the first switch valve and the second switch valve to be in an open state, and controls the third switch valve to be in a closed state, so that the compressed air in the main air storage reservoir is transported to the power generation component through the main pipeline, and the compressed air in the auxiliary air storage reservoir is transported to the power generation component through the auxiliary pipeline. The power generation component generates electricity through the compressed air input from the main pipeline and the compressed air input from the auxiliary pipeline, and the power generation power of the power generation component reaches the first set threshold again.

2. The system according to claim 1, characterized in that When the compressed air in the main gas storage reservoir meets the first power generation condition, the control device controls the first switch valve to be in an open state, and controls the second switch valve and the third switch valve to be in a closed state, so that the compressed air in the main gas storage reservoir is transported to the power generation component through the main pipeline, and the power generation component generates electricity through the compressed air input from the main pipeline.

3. The system according to claim 1, characterized in that When the compressed air in the main gas storage reservoir and the auxiliary gas storage reservoir does not meet the second power generation condition, the power generation component stops power generation.

4. A control method for a compressed air energy storage system, characterized in that: The compressed air energy storage system comprises a main pipeline, an auxiliary pipeline, a connecting pipeline and a power generation component, wherein the main pipeline is connected to the main gas storage reservoir and is used to transport the compressed air in the main gas storage reservoir to the power generation component, the auxiliary pipeline is connected to the auxiliary gas storage reservoir and is used to transport the compressed air in the auxiliary gas storage reservoir to the power generation component, the connecting pipeline is used to connect the main pipeline and the auxiliary pipeline, and the power generation component is used to generate electricity through compressed air; The control method comprises: The power generation component generates electricity through compressed air in the main gas storage reservoir; When it is detected that the power generation power of the power generation component is less than a first set threshold value, the power generation component is enabled to generate electricity through the compressed air in the main gas storage reservoir and the compressed air in the auxiliary gas storage reservoir; The method of making the power generation component generate electricity through compressed air in the main gas storage reservoir and compressed air in the auxiliary gas storage reservoir comprises: When it is detected that the power generation power of the power generation component is less than the first set threshold value, the main pipeline and the connecting pipeline are opened, and the auxiliary pipeline is closed, so that the compressed air in the main gas storage reservoir is transported to the power generation component through the main pipeline, and the compressed air in the auxiliary gas storage reservoir is transported to the power generation component through the connecting pipeline and the main pipeline, and the power generation component generates electricity through the compressed air input from the main pipeline, and the power generation power of the power generation component reaches the first set threshold value again; When the power generation component generates electricity through the compressed air input from the main pipeline, the power generation power of the power generation component is detected; When it is detected that the power generation power of the power generation component is less than the first set threshold value, the main pipeline and the auxiliary pipeline are opened and the connecting pipeline is closed, so that the compressed air in the main gas storage reservoir is transported to the power generation component through the main pipeline, and the compressed air in the auxiliary gas storage reservoir is transported to the power generation component through the auxiliary pipeline. The power generation component generates electricity through the compressed air input by the main pipeline and the compressed air input by the auxiliary pipeline, and the power generation power of the power generation component reaches the first set threshold value again.

5. The method according to claim 4, characterized in that The compressed air energy storage system further includes a connecting pipeline, which is used to connect the main pipeline and the auxiliary pipeline; the power generation component generates electricity through the compressed air in the main gas storage reservoir, including: The main pipeline is opened, and the auxiliary pipeline and the connecting pipeline are closed; so that the compressed air in the main gas storage reservoir is transported to the power generation component through the main pipeline, and the power generation component generates electricity through the compressed air in the main gas storage reservoir.

6. The method according to claim 4, characterized in that The control method further comprises: When it is detected that the power generation power of the power generation component is less than the second set threshold value, the main pipeline, the auxiliary pipeline and the connecting pipeline are closed to stop the power generation of the power generation component.

Images