Compressed air energy storage method, device, system and electronic equipment

Abstract

The present application provides a compressed air energy storage method, device, system and electronic equipment, the method comprising: obtaining the rated power of the compressed air energy storage system; according to the rated power, controlling the liquid pump to run at an initial speed, and at the same time connecting the liquid infusion pipeline between the first liquid storage tank and the second liquid storage tank, and connecting the gas transmission pipeline, so that based on the liquid pump according to the first preset flow rate, the liquid in the first liquid storage tank is injected into the second liquid storage tank through the liquid infusion pipeline, so that the gas in the second liquid storage tank enters the gas storage bottle through the gas transmission pipeline; after the liquid pump reaches the rated power, the gas in the gas storage bottle is input into the second liquid storage tank, so that the liquid in the second liquid storage tank is injected into the first liquid storage tank through the liquid infusion pipeline, so that the liquid pump drives the generator to generate electricity based on the current power. By compressing the air in the gas storage bottle, driving the liquid pump to rotate in the state of a hydraulic motor, and then driving the generator connected to the liquid pump to generate electricity, the cost demand of energy storage is reduced.

Description

Technical Field

[0001] The present application relates to the field of power management technology, and in particular to a compressed air energy storage method, device, system and electronic equipment. Background Art

[0002] At present, important large-scale hydropower stations are generally equipped with emergency energy storage systems for dam flood discharge equipment to ensure that the hydropower station can enter a safe operation mode in the event of a sudden power outage.

[0003] In the prior art, diesel generators or batteries are usually used as energy storage systems. However, the operation of diesel generators requires the consumption of fossil fuel energy, and batteries need to be manually charged regularly, both of which have high cost requirements. Summary of the invention

[0004] The present application provides a compressed air energy storage method, device, system and electronic equipment to solve the defects of the prior art such as high cost requirements.

[0005] The first aspect of the present application provides a method for compressed air energy storage, which is applied to a compressed air energy storage system, wherein the system comprises: a liquid pump, a first liquid storage tank, a second liquid storage tank, a gas storage bottle and a generator, wherein the installation position of the first liquid storage tank is higher than the installation position of the second liquid storage tank, a liquid infusion pipeline is provided between the first liquid storage tank and the second liquid storage tank, the liquid pump is on the liquid infusion pipeline, and a gas inlet and outlet of the second liquid storage tank and a gas inlet and outlet of the gas storage bottle are provided with a gas inlet and outlet, wherein the method comprises:

[0006] Obtaining the rated power of the compressed air energy storage system;

[0007] According to the rated power, the liquid pump is controlled to run at an initial speed, and at the same time, the liquid infusion pipeline between the first liquid storage tank and the second liquid storage tank is connected, and the gas transmission pipeline is connected, so that based on the liquid pump according to a first preset flow rate, the liquid in the first liquid storage tank is injected into the second liquid storage tank through the liquid infusion pipeline, and the gas in the second liquid storage tank enters the gas storage cylinder through the gas transmission pipeline;

[0008] Monitor the system temperature change value of the compressed air energy storage system during the operation of the liquid pump at the initial speed;

[0009] When the temperature change value of the system reaches a preset threshold, the liquid in the first liquid storage tank is injected into the second liquid storage tank through the liquid infusion pipeline based on the liquid pump at a second preset flow rate, the second preset flow rate is less than the first preset flow rate, and at the same time, the speed of the liquid pump is adjusted according to the current pressure of the liquid pump until the liquid pump reaches the rated power;

[0010] After the liquid pump reaches the rated power, if an energy storage call instruction is received, the gas in the gas cylinder is input into the second liquid storage tank based on the gas transmission pipeline, and the liquid in the second liquid storage tank is injected into the first liquid storage tank through the transmission pipeline, so that the liquid pump drives the generator to generate electricity based on the current power.

[0011] Optionally, adjusting the rotation speed of the liquid pump according to the current pressure of the liquid pump includes:

[0012] Obtaining a compression working efficiency characteristic curve of the liquid pump and a current pressure of the liquid pump; wherein the compression working efficiency characteristic curve represents a corresponding relationship among the liquid pump pressure, rotation speed and compression working efficiency;

[0013] Determining a target speed corresponding to the current pressure according to the compression working efficiency characteristic curve;

[0014] The rotation speed of the liquid pump is adjusted according to the target rotation speed.

[0015] Optionally, determining the target speed corresponding to the current pressure according to the compression work efficiency characteristic curve includes:

[0016] When the speed change value of the liquid pump within a preset time period does not exceed a preset threshold, the speed correction direction of the liquid pump is determined according to the compression efficiency of the liquid pump at the current speed and current pressure represented by the compression efficiency characteristic curve;

[0017] According to the rotation speed correction direction of the liquid pump and based on a preset rotation speed correction scale, the target rotation speed corresponding to the current pressure is determined.

[0018] Optionally, also include:

[0019] When the liquid pump is running at the target speed, obtaining the pressure of the gas storage bottle, the liquid injection flow rate of the second liquid storage tank, the liquid pump torque and the system temperature;

[0020] Determining the current power of the liquid pump according to the pressure of the gas cylinder, the liquid injection flow rate of the second liquid storage tank, the liquid pump torque and the system temperature;

[0021] Whether the liquid pump reaches the rated power is determined based on the magnitude relationship between the current power of the liquid pump and the rated power.

[0022] Optionally, also include:

[0023] When the liquid pump reaches the rated power, determining a target speed of the liquid pump according to the rated power and the liquid pump torque;

[0024] The rotation speed of the liquid pump is limited according to the target rotation speed.

[0025] The second aspect of the present application provides a compressed air energy storage device, which is applied to a compressed air energy storage system. The system includes: a liquid pump, a first liquid storage tank, a second liquid storage tank, a gas storage bottle and a generator. The installation position of the first liquid storage tank is higher than the installation position of the second liquid storage tank. A liquid infusion pipeline is provided between the first liquid storage tank and the second liquid storage tank. The liquid pump is on the liquid infusion pipeline. A gas inlet and outlet of the second liquid storage tank and the gas inlet and outlet of the gas storage bottle are provided with a gas inlet and outlet. The device includes:

[0026] An acquisition module, used to acquire the rated power of the compressed air energy storage system;

[0027] a first energy storage module, configured to control the liquid pump to operate at an initial speed according to the rated power, and at the same time connect the liquid infusion pipeline between the first liquid storage tank and the second liquid storage tank, and connect the gas transmission pipeline, so that based on the liquid pump according to a first preset flow rate, the liquid in the first liquid storage tank is injected into the second liquid storage tank through the liquid infusion pipeline, and the gas in the second liquid storage tank enters the gas storage cylinder through the gas transmission pipeline;

[0028] A monitoring module, used for monitoring a system temperature change value of the compressed air energy storage system during the operation of the liquid pump at an initial speed;

[0029] a second energy storage module, configured to, when the temperature change value of the system reaches a preset threshold, inject the liquid in the first liquid storage tank into the second liquid storage tank through the liquid infusion pipeline based on the liquid pump at a second preset flow rate, wherein the second preset flow rate is less than the first preset flow rate, and at the same time, adjust the speed of the liquid pump according to the current pressure of the liquid pump until the liquid pump reaches the rated power;

[0030] The energy storage calling module is used to input the gas in the gas cylinder into the second liquid storage tank based on the gas transmission pipeline after the liquid pump reaches the rated power, if an energy storage calling instruction is received, so that the liquid in the second liquid storage tank is injected into the first liquid storage tank through the transmission pipeline, so that the liquid pump drives the generator to generate electricity based on the current power.

[0031] The third aspect of the present application provides a compressed air energy storage system, comprising: a liquid pump, a first liquid storage tank, a second liquid storage tank, a gas storage bottle, a generator, and a compressed air energy storage device as described in the second aspect above;

[0032] The installation position of the first liquid storage tank is higher than that of the second liquid storage tank, a liquid infusion pipeline is provided between the first liquid storage tank and the second liquid storage tank, the liquid pump is on the liquid infusion pipeline, and a gas inlet and outlet of the second liquid storage tank and the gas inlet and outlet of the gas storage bottle are provided with a gas inlet and outlet pipeline;

[0033] The compressed air energy storage device controls the compressed air energy storage system using the method described in the first aspect and various possible designs of the first aspect.

[0034] Optionally, the air inlet of the second gas storage cylinder is provided with an air inlet pipe, and the air inlet pipe is connected to the outside of the system and is used to fill the second gas storage cylinder with external gas.

[0035] A fourth aspect of the present application provides an electronic device, comprising: at least one processor and a memory;

[0036] The memory stores computer-executable instructions;

[0037] The at least one processor executes the computer-executable instructions stored in the memory, so that the at least one processor performs the method described in the first aspect and various possible designs of the first aspect.

[0038] A fifth aspect of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions. When a processor executes the computer-executable instructions, the method described in the first aspect and various possible designs of the first aspect are implemented.

[0039] The technical solution of this application has the following advantages:

[0040] The present application provides a compressed air energy storage method, device, system and electronic equipment, the method comprising: obtaining the rated power of the compressed air energy storage system; according to the rated power, controlling the liquid pump to operate at an initial speed, and at the same time connecting the liquid infusion pipeline between the first liquid storage tank and the second liquid storage tank, and connecting the gas transmission pipeline, so that based on the liquid pump according to a first preset flow rate, the liquid in the first liquid storage tank is injected into the second liquid storage tank through the liquid infusion pipeline, so that the gas in the second liquid storage tank enters the gas storage bottle through the gas transmission pipeline; monitoring the system temperature change value of the compressed air energy storage system during the operation of the liquid pump at the initial speed; when the system temperature change value reaches a preset threshold, based on the liquid pump according to a second preset flow rate, the liquid in the first liquid storage tank is injected into the second liquid storage tank through the liquid infusion pipeline, the second preset flow rate is less than the first preset flow rate, and at the same time, according to the current pressure of the liquid pump, the speed of the liquid pump is adjusted until the liquid pump reaches the rated power; after the liquid pump reaches the rated power, if an energy storage call instruction is received, based on the gas transmission pipeline, the gas in the gas storage bottle is input into the second liquid storage tank, so that the liquid in the second liquid storage tank is injected into the first liquid storage tank through the liquid infusion pipeline, so that the liquid pump drives the generator to generate electricity based on the current power. The method provided by the above scheme compresses the air in the gas cylinder, and when energy storage is called, based on the high-pressure gas output by the gas cylinder, the liquid in the second liquid storage tank is injected into the first liquid storage tank through the infusion pipeline, and the liquid pump is driven to rotate in the state of a hydraulic motor, thereby driving the generator connected to the liquid pump to generate electricity. The whole process not only does not require the consumption of fossil fuel energy, but also does not require human intervention, thereby reducing the cost demand of energy storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present application 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. Obviously, the drawings described below are some embodiments of the present application, and a person skilled in the art can also obtain other drawings based on these drawings.

[0042] Figure 1 A schematic diagram of the structure of the power system on which the embodiments of the present application are based;

[0043] Figure 2 A schematic diagram of a compressed air energy storage method according to an embodiment of the present application;

[0044] Figure 3 A schematic flow chart of an exemplary compressed air energy storage method provided in an embodiment of the present application;

[0045] Figure 4 A schematic flow chart of another exemplary compressed air energy storage method is provided for an embodiment of the present application;

[0046] Figure 5 A schematic diagram of the structure of a compressed air energy storage device provided in an embodiment of the present application;

[0047] Figure 6 A schematic diagram of the structure of a compressed air energy storage system provided in an embodiment of the present application;

[0048] Figure 7 A schematic structural diagram of an exemplary compressed air energy storage system provided in an embodiment of the present application;

[0049] Figure 8 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application.

[0050] The above drawings have shown clear embodiments of the present application, which will be described in more detail below. These drawings and text descriptions are not intended to limit the scope of the present disclosure in any way, but to illustrate the concepts of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0052] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the following embodiments, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0053] In the prior art, diesel generators or batteries are usually used as energy storage systems. However, diesel generators have the disadvantages of high risk of misoperation and are not environmentally friendly. At present, it is proposed to combine diesel generators and battery energy storage systems to achieve a composite emergency power supply system that can provide uninterrupted power supply and long-term power supply. However, the battery pack needs to be manually charged regularly, and there is an emergency situation in which the battery pack is completely discharged when the entire station suddenly loses power and other external power sources cannot quickly restore power. In addition, the capacity life of the battery pack is related to the commissioning time, that is, the longer the use time, the lower the capacity, which increases the demand for energy storage costs.

[0054] In view of the above problems, the compressed air energy storage method, device, system and electronic device provided in the embodiments of the present application obtain the rated power of the compressed air energy storage system; according to the rated power, control the liquid pump to run at an initial speed, and at the same time connect the liquid infusion pipeline between the first liquid storage tank and the second liquid storage tank, and connect the gas pipeline, so that based on the liquid pump according to the first preset flow rate, the liquid in the first liquid storage tank is injected into the second liquid storage tank through the liquid infusion pipeline, so that the gas in the second liquid storage tank enters the gas storage bottle through the gas pipeline; monitor the system temperature change of the compressed air energy storage system during the operation of the liquid pump at the initial speed value; when the system temperature change value reaches the preset threshold, based on the liquid pump according to the second preset flow rate, the liquid in the first liquid storage tank is injected into the second liquid storage tank through the infusion pipeline, the second preset flow rate is less than the first preset flow rate, and at the same time, according to the current pressure of the liquid pump, the speed of the liquid pump is adjusted until the liquid pump reaches the rated power; after the liquid pump reaches the rated power, if the energy storage call instruction is received, the gas in the gas cylinder is input into the second liquid storage tank based on the gas pipeline, so that the liquid in the second liquid storage tank is injected into the first liquid storage tank through the infusion pipeline, so that the liquid pump drives the generator to generate electricity based on the current power. The method provided by the above scheme compresses the air of the gas cylinder, and when the energy storage is called, based on the high-pressure gas output by the gas cylinder, the liquid in the second liquid storage tank is injected into the first liquid storage tank through the infusion pipeline, driving the liquid pump to rotate in the state of a hydraulic motor, and then driving the generator connected to the liquid pump to generate electricity. The whole process not only does not require the consumption of fossil fuel energy, but also does not require manual intervention, reducing the cost demand of energy storage.

[0055] The following specific embodiments may be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments. The embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0056] First, the structure of the power system on which this application is based is described:

[0057] The compressed air energy storage method, device, system and electronic equipment provided in the embodiments of the present application are suitable for providing electric energy to the power system. Figure 1 As shown, it is a schematic diagram of the structure of the power system based on the embodiment of the present application, which mainly includes power dispatching equipment, compressed air energy storage system, compressed air energy storage device and power-consuming equipment. Specifically, the power dispatching equipment can send power dispatching demand information to the compressed air energy storage device, and the device determines the rated power of the compressed air energy storage system according to the obtained power dispatching demand information, and then controls the compressed air energy storage system accordingly to generate electric energy and transmit the electric energy to the power-consuming equipment.

[0058] The embodiment of the present application provides a compressed air energy storage method, which is applied to a compressed air energy storage system, the system includes a liquid pump, a first liquid storage tank, a second liquid storage tank, a gas storage bottle and a generator, the installation position of the first liquid storage tank is higher than the installation position of the second liquid storage tank, a liquid infusion pipeline is provided between the first liquid storage tank and the second liquid storage tank, the liquid pump is on the liquid infusion pipeline, and a gas inlet and outlet of the second liquid storage tank and the gas inlet and outlet of the gas storage bottle are provided with a gas inlet and outlet, and the compressed air energy storage method provided in the embodiment of the present application is used to control the compressed air energy storage system to store energy in the form of compressed air. The executor of the embodiment of the present application is an electronic device, such as a server, a desktop computer, a laptop computer, a tablet computer and other electronic devices that can be used to control the compressed air energy storage system.

[0059] like Figure 2 FIG. 1 is a flow chart of a compressed air energy storage method provided in an embodiment of the present application, the method comprising:

[0060] Step 201, obtaining the rated power of the compressed air energy storage system.

[0061] Specifically, the power dispatching demand information issued by the power dispatching equipment in the power system can be obtained, and then the rated power that the compressed air energy storage system needs to achieve can be determined by analyzing the power dispatching demand information. Then, the operation of the compressed air energy storage system can be controlled with the rated power as the target.

[0062] Step 202, according to the rated power, controls the liquid pump to run at an initial speed, and at the same time connects the liquid infusion pipeline between the first liquid storage tank and the second liquid storage tank, and connects the gas pipeline, so that based on the liquid pump according to the first preset flow rate, the liquid in the first liquid storage tank is injected into the second liquid storage tank through the liquid infusion pipeline, and the gas in the second liquid storage tank enters the gas storage cylinder through the gas pipeline.

[0063] Specifically, in order to enable the power of the compressed air energy storage system to be quickly increased to the rated power, a higher initial speed can be pre-set so that the liquid pump runs at a higher initial speed. At this time, the compressed air energy storage system is in energy storage mode, so the liquid infusion pipeline between the first liquid storage tank and the second liquid storage tank can be connected, and the gas pipeline between the gas inlet and outlet of the second liquid storage tank and the gas inlet and outlet of the gas bottle can be connected. At this time, the first liquid storage tank is a normal pressure liquid storage tank, and the second liquid storage tank is a high-pressure liquid storage tank. Since the installation position of the first liquid storage tank is higher than the installation position of the second liquid storage tank, the liquid in the second liquid storage tank can be injected into the second liquid storage tank through the liquid infusion pipeline under the action of the liquid pump, and then the gas in the second liquid storage tank is compressed and input into the gas bottle through the gas pipeline to achieve primary energy storage.

[0064] Among them, since the liquid pump is running at the initial speed, the liquid pump can specifically inject the liquid in the first liquid storage tank into the second liquid storage tank through the infusion pipeline according to a higher first compression ratio and a higher first preset flow rate.

[0065] Step 203, monitoring the system temperature change value of the compressed air energy storage system when the liquid pump is running at the initial speed.

[0066] It should be noted that, since the power of the compressed air energy storage system is gradually increasing and has not reached the rated power value during the operation of the liquid pump at the initial speed, in the initial stage of compressed energy storage, the liquid pump injects the liquid in the first liquid storage tank into the second liquid storage tank through the infusion pipeline according to the first preset flow rate. As the compression energy storage process proceeds, heat accumulation causes the temperature of the compressed air energy storage system to rise.

[0067] Step 204, when the system temperature change value reaches a preset threshold, based on the liquid pump, the liquid in the first liquid storage tank is injected into the second liquid storage tank through the infusion pipeline according to a second preset flow rate, and the second preset flow rate is less than the first preset flow rate. At the same time, according to the current pressure of the liquid pump, the speed of the liquid pump is adjusted until the liquid pump reaches the rated power.

[0068] Specifically, the temperature change of the compressed air energy storage system can be monitored in real time. When the system temperature change value of the compressed air energy storage system within a fixed time period reaches a preset threshold, the compressed air energy storage system is controlled to enter the next stage of compressed energy storage.

[0069] Specifically, in the next stage of the compressed air energy storage system, the flow rate of the liquid injected from the first liquid storage tank to the second liquid storage tank can be reduced, that is, the liquid pump can inject the liquid in the first liquid storage tank into the second liquid storage tank through the liquid delivery pipeline according to the lower second compression ratio and the lower second preset flow rate. At the same time, the speed of the liquid pump can be adjusted according to the current pressure of the liquid pump based on the converter connected to the liquid pump.

[0070] Step 205, after the liquid pump reaches the rated power, if an energy storage call instruction is received, the gas in the gas cylinder is input into the second liquid storage tank based on the gas transmission pipeline, and the liquid in the second liquid storage tank is injected into the first liquid storage tank through the liquid transmission pipeline, so that the liquid pump drives the generator to generate electricity based on the current power.

[0071] It should be noted that steps 201-204 are the energy storage process of the compressed air energy storage system, and step 205 is the energy release process of the compressed air energy storage system.

[0072] Specifically, after receiving the energy storage call instruction, the compressed air energy storage system is controlled to enter the energy release state. In the energy release state, the gas pipeline between the gas storage bottle and the second liquid storage tank is connected, and the liquid infusion pipeline between the first liquid storage tank and the second liquid storage tank is connected. At this time, the high-pressure gas in the liquid storage bottle is input into the second liquid storage tank through the gas pipeline, so that the liquid in the second liquid storage tank is injected into the first liquid storage tank through the liquid infusion pipeline under the action of the high-pressure gas, thereby driving the liquid pump to enter the hydraulic motor state, driving the coaxial generator to generate electricity with the current power, and realizing one-time energy release.

[0073] For example, Figure 3 As shown, it is a schematic diagram of a flow chart of an exemplary compressed air energy storage method provided in an embodiment of the present application. First, an emergency power supply power instruction is input to indicate the rated power P N Then, the pressure of the gas cylinder is tested to see if it meets the standard. If it does, it indicates that the current energy storage is sufficient to respond to the emergency power supply power instruction. Otherwise, energy storage is required. If it meets the standard, it can monitor in real time whether the emergency power supply call instruction (energy storage call instruction) is input. If it is received, the corresponding energy release work is carried out, and the energy release time t is recorded at the same time. i+1 =t i +Δt, when the cumulative energy release time t i+1 ≥t T When t T Indicates the rated working time of the compression function energy storage system, t T Can be set according to emergency power call command.

[0074] Based on the above embodiment, as an implementable manner, in one embodiment, the speed of the liquid pump is adjusted according to the current pressure of the liquid pump, including:

[0075] Step 2041, obtaining a compression efficiency characteristic curve of the liquid pump and a current pressure of the liquid pump; wherein the compression efficiency characteristic curve represents a corresponding relationship among the liquid pump pressure, rotation speed and compression efficiency;

[0076] Step 2042, determining a target speed corresponding to the current pressure according to the compression efficiency characteristic curve;

[0077] Step 2043, adjusting the speed of the liquid pump according to the target speed.

[0078] It should be noted that during the compressed air energy storage process, the pressure of the liquid pump gradually increases and the power of the liquid pump gradually increases. Before reaching the rated power, in order to ensure that the pressure, speed and compression efficiency of the liquid pump match each other, the speed can be adjusted according to the current pressure of the liquid pump based on the efficiency characteristic curve of the liquid pump.

[0079] Specifically, in one embodiment, when the speed change value of the liquid pump within a preset time period does not exceed a preset threshold value, the speed correction direction of the liquid pump can be determined according to the compression work efficiency of the liquid pump at the current speed and current pressure represented by the compression work efficiency characteristic curve; according to the speed correction direction of the liquid pump, according to the preset speed correction scale, the target speed corresponding to the current pressure is determined.

[0080] Specifically, in one embodiment, the gas cylinder pressure, the liquid injection flow rate of the second liquid storage tank, the liquid pump torque and the system temperature can be obtained when the liquid pump is running at the target speed; the current power of the liquid pump is determined based on the gas cylinder pressure, the liquid injection flow rate of the second liquid storage tank, the liquid pump torque and the system temperature; and whether the liquid pump reaches the rated power is determined based on the relationship between the current power of the liquid pump and the rated power.

[0081] Furthermore, in one embodiment, when the liquid pump reaches the rated power, the target speed of the liquid pump can be determined according to the rated power and the torque of the liquid pump; and the speed of the liquid pump can be limited according to the target speed.

[0082] Specifically, Figure 4 As shown, another exemplary flow chart of the compressed air energy storage method is provided for the embodiment of the present application. When adjusting the speed of the liquid pump, the current speed N of the liquid pump is first obtained in real time. k and liquid pump efficiency (compression efficiency) η k , when the current speed of the liquid pump is N k Achieve the liquid pump efficiency η represented by the working efficiency characteristic curve k The corresponding target speed N ref After they are equal, collect the gas cylinder pressure p, the liquid injection flow rate (system flow rate) Q of the second liquid storage tank, and the liquid pump torque T p and system temperature t k Then, the liquid pump power P is calculated according to the pressure of the gas cylinder, the liquid injection flow rate of the second liquid storage tank, the liquid pump torque and the system temperature. N Before, determine the speed change value of the liquid pump within the preset time period |N k -N k-1 |Whether it exceeds the preset threshold e N If not, then further determine the current system temperature t k Is the relative initial system temperature (room temperature) t0 higher than the preset temperature difference Δt? If so, the liquid pump is set to the first compression ratio C r1 , the liquid in the first liquid storage tank is injected into the second liquid storage tank through the liquid infusion pipeline at a higher first preset flow rate, and vice versa, the liquid pump is made to flow at a second compression ratio C r2, the liquid in the first liquid storage tank is injected into the second liquid storage tank through the liquid infusion pipeline at a lower second preset flow rate. Then, according to the relationship between the compression efficiency under the current pressure and the current speed Determine whether the speed correction direction of the liquid pump is increasing or decreasing. If it is increasing, determine the target speed N ref =N rk +ΔN, if it decreases, then the target speed N is determined ref =N rk -ΔN, ΔN is the preset speed correction scale, Among them, the speed change value of the liquid pump within the preset time period |N k -N k-1 Exceeds the preset threshold N , then the current speed N k Determined as the target speed N ref , that is, no speed adjustment is performed.

[0083] When the liquid pump reaches the rated power, a preset maximum power point tracking control strategy can be used to limit the speed of the liquid pump to keep it at the maximum power point.

[0084] Specifically, the maximum power point tracking control strategy can be expressed as the following formula:

[0085]

[0086] It should be noted that, regardless of the energy storage process or the energy release process of the compressed air energy storage system, the liquid pump speed regulation method is the same. The above embodiment mainly takes the energy storage process as an example to describe the specific implementation method of the liquid pump speed regulation, and the energy release process will not be repeated.

[0087] The compressed air energy storage method provided in the embodiment of the present application obtains the rated power of the compressed air energy storage system; according to the rated power, controls the liquid pump to run at an initial speed, and at the same time connects the liquid infusion pipeline between the first liquid storage tank and the second liquid storage tank, and connects the gas transmission pipeline, so that based on the liquid pump according to the first preset flow rate, the liquid in the first liquid storage tank is injected into the second liquid storage tank through the liquid infusion pipeline, so that the gas in the second liquid storage tank enters the gas storage bottle through the gas transmission pipeline; monitors the system temperature change value of the compressed air energy storage system during the operation of the liquid pump at the initial speed; when the system temperature change value reaches a preset threshold, based on the liquid pump according to the second preset flow rate, the liquid in the first liquid storage tank is injected into the second liquid storage tank through the liquid infusion pipeline, the second preset flow rate is less than the first preset flow rate, and at the same time, according to the current pressure of the liquid pump, the speed of the liquid pump is adjusted until the liquid pump reaches the rated power; after the liquid pump reaches the rated power, if an energy storage call instruction is received, the gas in the gas storage bottle is input into the second liquid storage tank based on the gas transmission pipeline, so that the liquid in the second liquid storage tank is injected into the first liquid storage tank through the liquid infusion pipeline, so that the liquid pump drives the generator to generate electricity based on the current power. The method provided by the above scheme compresses the air in the gas cylinder, and when the energy storage is called, the liquid in the second liquid storage tank is injected into the first liquid storage tank through the infusion pipeline based on the high-pressure gas output by the gas cylinder, and the liquid pump is driven to rotate in the state of a hydraulic motor, and then the generator connected to the liquid pump is driven to generate electricity. The whole process does not only not require the consumption of fossil fuel energy, but also does not require human intervention, reducing the cost of energy storage. In addition, the application of micro-compressed air energy storage technology in hydropower stations can effectively solve the problem of hydropower consumption when there is excess electricity.

[0088] An embodiment of the present application provides a compressed air energy storage device for executing the compressed air energy storage method provided in the above embodiment.

[0089] like Figure 5 , which is a schematic diagram of the structure of a compressed air energy storage device provided in an embodiment of the present application. The compressed air energy storage device 50 comprises: an acquisition module 501 , a first energy storage module 502 , a monitoring module 503 , a second energy storage module 504 and an energy storage calling module 505 .

[0090] Among them, the acquisition module is used to obtain the rated power of the compressed air energy storage system; the first energy storage module is used to control the liquid pump to run at an initial speed according to the rated power, and at the same time connect the liquid infusion pipeline between the first liquid storage tank and the second liquid storage tank, and connect the gas pipeline, so that based on the liquid pump according to the first preset flow rate, the liquid in the first liquid storage tank is injected into the second liquid storage tank through the liquid infusion pipeline, so that the gas in the second liquid storage tank enters the gas storage cylinder through the gas pipeline; the monitoring module is used to monitor the system temperature change value of the compressed air energy storage system when the liquid pump runs at the initial speed; the second energy storage module is used when the system When the temperature change value reaches a preset threshold, the liquid in the first liquid storage tank is injected into the second liquid storage tank through the infusion pipeline based on the liquid pump according to the second preset flow rate, the second preset flow rate is less than the first preset flow rate, and the speed of the liquid pump is adjusted according to the current pressure of the liquid pump until the liquid pump reaches the rated power; the energy storage calling module is used to input the gas in the gas cylinder into the second liquid storage tank based on the gas pipeline after the liquid pump reaches the rated power if an energy storage calling instruction is received, so that the liquid in the second liquid storage tank is injected into the first liquid storage tank through the infusion pipeline, so that the liquid pump drives the generator to generate electricity based on the current power.

[0091] Regarding the compressed air energy storage device in this embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0092] The compressed air energy storage device provided in the embodiment of the present application is used to execute the compressed air energy storage method provided in the above embodiment. Its implementation method and principle are the same and will not be repeated here.

[0093] An embodiment of the present application provides a compressed air energy storage system for executing the compressed air energy storage method provided in the above embodiment.

[0094] like Figure 6 , which is a schematic diagram of the structure of the compressed air energy storage system provided in the embodiment of the present application. The compressed air energy storage system 60 comprises: a liquid pump 601, a first liquid storage tank 602, a second liquid storage tank 603, a gas storage bottle 604, a generator 605 and the compressed air energy storage device 50 provided in the above embodiment.

[0095] Among them, the installation position of the first liquid storage tank is higher than the installation position of the second liquid storage tank, a liquid infusion pipeline is provided between the first liquid storage tank and the second liquid storage tank, the liquid pump is on the liquid infusion pipeline, and a gas infusion pipeline is provided between the gas inlet and outlet of the second liquid storage tank and the gas inlet and outlet of the gas storage bottle; the compressed air energy storage device adopts the compressed air energy storage method provided in the above embodiment to control the compressed air energy storage system.

[0096] Specifically, in one embodiment, an air inlet of the second liquid storage tank is provided with an air inlet pipe, and the air inlet pipe is connected to the outside of the system for filling the second liquid storage tank with external gas.

[0097] Specifically, Figure 7 As shown, it is a structural schematic diagram of an exemplary compressed air energy storage system provided in an embodiment of the present application, which is used to provide electrical energy for a dam gate. The system also includes a turbine unit, a transmission, a transformer and a dam gate. The infusion pipeline provided between the first liquid storage tank and the second liquid storage tank is divided into a first infusion pipeline and a second infusion pipeline. The first infusion pipeline is used for liquid transportation from the first liquid storage tank to the second liquid storage tank, and the second infusion pipeline is used for liquid transportation from the second liquid storage tank to the first liquid storage tank. Switches S2 and S4 are located in the first infusion pipeline. When S2 and S4 are closed, the first infusion pipeline is connected. Switches S1 and S3 are located in the second infusion pipeline. When S1 and S3 are closed, the second infusion pipeline is connected. Switch S5 is located on the gas pipeline provided between the gas inlet and outlet of the second liquid storage tank and the gas inlet and outlet of the gas cylinder. When S5 is closed, the gas pipeline is connected. Switch S6 is located on the air intake pipeline of the second liquid storage tank. When S6 is closed, the air intake pipeline is connected.

[0098] Among them, for the energy storage stage of the compressed air energy storage system, when the turbine unit does not receive the energy storage call instruction, it drives the transmission to make the transmission drive the liquid pump. At this time, the working state of the liquid pump is a hydraulic pump. Specifically, switches S2, S4, and S5 can be controlled to be closed, and switches S1, S3, and S6 can be disconnected. At this time, the first liquid storage tank is a normal pressure liquid storage tank, and the second liquid storage tank is a high-pressure liquid storage tank. The liquid in the first liquid storage tank flows into the second liquid storage tank under the action of the hydraulic pump, thereby pressing the gas in the second liquid storage tank into the gas storage bottle to achieve primary energy storage. Switches S2, S4, and S5 are disconnected, and switches S1, S3, and S6 are closed. The liquid in the second liquid storage tank is pumped back into the first liquid storage tank under the action of the liquid pump. Since S6 is turned on, the second liquid storage tank is connected to the outside world, and can be refilled with air to restore the normal pressure state. Repeating this process can achieve continuous energy storage.

[0099] For the energy release stage of the compressed air energy storage system, the turbine unit is separated from the transmission when receiving the energy storage call instruction, and hydroelectric power generation is performed. At this time, if the instruction to start the emergency power supply of the dam gate is received, the high-pressure air in the gas cylinder expands and does work, driving the liquid pump to work. At this time, the working state of the liquid pump is a hydraulic motor, which in turn drives the generator to generate electricity. Specifically, switches S1, S3, and S5 can be controlled to be closed, and switches S2, S4, and S6 can be disconnected. The liquid in the second liquid storage tank flows into the first liquid storage tank under the action of the high-pressure gas in the gas storage tank, thereby driving the hydraulic motor to rotate and drive the coaxial generator to generate electricity, realizing a primary energy release. Switches S1, S3, and S5 are disconnected, and switches S2, S4, and S6 are closed. Both the first liquid storage tank and the second liquid storage tank are connected to the outside world. Since the installation position of the first liquid storage tank is higher than that of the second liquid storage tank, the liquid in the first liquid storage tank flows back to the second liquid storage tank based on gravity. Repeating this process can achieve continuous energy release.

[0100] The compressed air energy storage system provided in the embodiment of the present application is used to execute the compressed air energy storage method provided in the above embodiment. Its implementation method and principle are the same and will not be repeated here.

[0101] An embodiment of the present application provides an electronic device for executing the compressed air energy storage method provided in the above embodiment.

[0102] like Figure 8 FIG. 8 is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. The electronic device 80 includes: at least one processor 81 and a memory 82.

[0103] The memory stores computer-executable instructions; at least one processor executes the computer-executable instructions stored in the memory, so that the at least one processor executes the compressed air energy storage method provided in the above embodiment.

[0104] An electronic device provided in an embodiment of the present application is used to execute the compressed air energy storage method provided in the above embodiment. Its implementation method and principle are the same and will not be repeated here.

[0105] An embodiment of the present application provides a computer-readable storage medium, in which computer-executable instructions are stored. When a processor executes the computer-executable instructions, the compressed air energy storage method provided in any of the above embodiments is implemented.

[0106] The storage medium containing computer executable instructions in the embodiment of the present application can be used to store computer executable instructions of the compressed air energy storage method provided in the aforementioned embodiment. The implementation method and principle are the same and will not be repeated here.

[0107] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0108] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0109] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0110] The above-mentioned integrated unit implemented in the form of a software functional unit can be stored in a computer-readable storage medium. The above-mentioned software functional unit is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor to perform some steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk and other media that can store program code.

[0111] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example for illustration. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. The specific working process of the device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0112] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A compressed air energy storage method, applied to a compressed air energy storage system, the system comprising: A liquid pump, a first liquid storage tank, a second liquid storage tank, a gas storage bottle and a generator, wherein the installation position of the first liquid storage tank is higher than the installation position of the second liquid storage tank, a liquid infusion pipeline is provided between the first liquid storage tank and the second liquid storage tank, the liquid pump is on the liquid infusion pipeline, and a gas inlet and outlet of the second liquid storage tank and the gas inlet and outlet of the gas storage bottle are provided with a gas inlet and outlet, characterized in that the method comprises: Obtaining the rated power of the compressed air energy storage system; According to the rated power, the liquid pump is controlled to run at an initial speed, and at the same time, the liquid infusion pipeline between the first liquid storage tank and the second liquid storage tank is connected, and the gas transmission pipeline is connected, so that based on the liquid pump according to a first preset flow rate, the liquid in the first liquid storage tank is injected into the second liquid storage tank through the liquid infusion pipeline, and the gas in the second liquid storage tank enters the gas storage cylinder through the gas transmission pipeline; Monitor the system temperature change value of the compressed air energy storage system during the operation of the liquid pump at the initial speed; When the temperature change value of the system reaches a preset threshold, the liquid in the first liquid storage tank is injected into the second liquid storage tank through the liquid infusion pipeline based on the liquid pump at a second preset flow rate, the second preset flow rate is less than the first preset flow rate, and at the same time, the speed of the liquid pump is adjusted according to the current pressure of the liquid pump until the liquid pump reaches the rated power; After the liquid pump reaches the rated power, if an energy storage call instruction is received, the gas in the gas cylinder is input into the second liquid storage tank based on the gas transmission pipeline, so that the liquid in the second liquid storage tank is injected into the first liquid storage tank through the liquid transmission pipeline, so that the liquid pump drives the generator to generate electricity based on the current power; The method further comprises: When the liquid pump is running at the target speed, the pressure of the gas storage bottle, the liquid injection flow rate of the second liquid storage tank, the liquid pump torque and the system temperature are obtained; Determining the current power of the liquid pump according to the pressure of the gas cylinder, the liquid injection flow rate of the second liquid storage tank, the liquid pump torque and the system temperature; According to the magnitude relationship between the current power of the liquid pump and the rated power, determining whether the liquid pump reaches the rated power; When the liquid pump reaches the rated power, determining a target speed of the liquid pump according to the rated power and the liquid pump torque; According to the target speed, limiting the speed of the liquid pump; The target speed is calculated as follows: in, The target speed, Indicates the rated power, represents the liquid pump torque.

2. The method according to claim 1, characterized in that: The adjusting the speed of the liquid pump according to the current pressure of the liquid pump comprises: Obtaining a compression working efficiency characteristic curve of the liquid pump and a current pressure of the liquid pump; wherein the compression working efficiency characteristic curve represents a corresponding relationship among the liquid pump pressure, rotation speed and compression working efficiency; Determining a target speed corresponding to the current pressure according to the compression working efficiency characteristic curve; The rotation speed of the liquid pump is adjusted according to the target rotation speed.

3. The method according to claim 2, characterized in that The determining, according to the compression working efficiency characteristic curve, the target speed corresponding to the current pressure includes: When the speed change value of the liquid pump within a preset time period does not exceed a preset threshold, the speed correction direction of the liquid pump is determined according to the compression efficiency of the liquid pump at the current speed and current pressure represented by the compression efficiency characteristic curve; According to the rotation speed correction direction of the liquid pump and based on a preset rotation speed correction scale, the target rotation speed corresponding to the current pressure is determined.

4. A compressed air energy storage device, applied to a compressed air energy storage system, the system comprising: A liquid pump, a first liquid storage tank, a second liquid storage tank, a gas storage bottle and a generator, wherein the installation position of the first liquid storage tank is higher than the installation position of the second liquid storage tank, a liquid infusion pipeline is provided between the first liquid storage tank and the second liquid storage tank, the liquid pump is on the liquid infusion pipeline, and a gas inlet and outlet of the second liquid storage tank and the gas inlet and outlet of the gas storage bottle are provided with a gas inlet and outlet, characterized in that the device comprises: An acquisition module, used to acquire the rated power of the compressed air energy storage system; a first energy storage module, configured to control the liquid pump to operate at an initial speed according to the rated power, and at the same time connect the liquid infusion pipeline between the first liquid storage tank and the second liquid storage tank, and connect the gas transmission pipeline, so that based on the liquid pump according to a first preset flow rate, the liquid in the first liquid storage tank is injected into the second liquid storage tank through the liquid infusion pipeline, and the gas in the second liquid storage tank enters the gas storage cylinder through the gas transmission pipeline; A monitoring module, used for monitoring a system temperature change value of the compressed air energy storage system during the operation of the liquid pump at an initial speed; a second energy storage module, configured to, when the temperature change value of the system reaches a preset threshold, inject the liquid in the first liquid storage tank into the second liquid storage tank through the liquid infusion pipeline based on the liquid pump at a second preset flow rate, wherein the second preset flow rate is less than the first preset flow rate, and at the same time, adjust the speed of the liquid pump according to the current pressure of the liquid pump until the liquid pump reaches the rated power; an energy storage calling module, configured to input the gas in the gas cylinder into the second liquid storage tank based on the gas transmission pipeline after the liquid pump reaches the rated power, if an energy storage calling instruction is received, so that the liquid in the second liquid storage tank is injected into the first liquid storage tank through the liquid transmission pipeline, so that the liquid pump drives the generator to generate electricity based on the current power; The second energy storage module is further used for: When the liquid pump is running at the target speed, the pressure of the gas storage bottle, the liquid injection flow rate of the second liquid storage tank, the liquid pump torque and the system temperature are obtained; Determining the current power of the liquid pump according to the pressure of the gas cylinder, the liquid injection flow rate of the second liquid storage tank, the liquid pump torque and the system temperature; According to the magnitude relationship between the current power of the liquid pump and the rated power, determining whether the liquid pump reaches the rated power; When the liquid pump reaches the rated power, determining a target speed of the liquid pump according to the rated power and the liquid pump torque; According to the target speed, limiting the speed of the liquid pump; The target speed is calculated as follows: in, The target speed, Indicates the rated power, represents the liquid pump torque.

5. A compressed air energy storage system, characterized in that: include: A liquid pump, a first liquid storage tank, a second liquid storage tank, a gas storage bottle, a generator and the compressed air energy storage device according to claim 4; The installation position of the first liquid storage tank is higher than that of the second liquid storage tank, a liquid infusion pipeline is provided between the first liquid storage tank and the second liquid storage tank, the liquid pump is on the liquid infusion pipeline, and a gas inlet and outlet of the second liquid storage tank and the gas inlet and outlet of the gas storage bottle are provided with a gas inlet and outlet pipeline; The compressed air energy storage device adopts the compressed air energy storage method described in any one of claims 1-3 to control the compressed air energy storage system.

6. The system according to claim 5, characterized in that The air inlet of the gas storage cylinder is provided with an air inlet pipeline, which is connected to the outside of the system and is used to fill the gas storage cylinder with external gas.

7. An electronic device, characterized in that: include: at least one processor and memory; The memory stores computer-executable instructions; The at least one processor executes the computer-executable instructions stored in the memory, so that the at least one processor performs the method according to any one of claims 1 to 3.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, and when a processor executes the computer-executable instructions, the method according to any one of claims 1 to 3 is implemented.

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