Air turbine starting system and method for large compressed air energy storage power station

Abstract

The invention relates to a large compressed air energy storage power station air turbine starting system and method. The system comprises a high-pressure cylinder, the high-pressure cylinder is connected to a high-pressure main air valve through a first high-pressure adjusting valve and a second high-pressure adjusting valve, the high-pressure main air valve is connected to a high-pressure cylinder inlet heat exchanger, and the high-pressure cylinder inlet heat exchanger is connected to a salt cavern outlet; the medium-pressure cylinder is connected to a medium-pressure main air valve through a medium-pressure starting adjusting valve, a first medium-pressure adjusting valve and a second medium-pressure adjusting valve, the medium-pressure main air valve is connected to a medium-pressure cylinder inlet heat exchanger, and the medium-pressure cylinder inlet heat exchanger is connected to a high-pressure cylinder outlet. The low-pressure cylinder is connected to a low-pressure cylinder inlet heat exchanger through a low-pressure main air valve, and the low-pressure cylinder inlet heat exchanger is connected to an intermediate-pressure cylinder outlet; and a high-pressure bypass valve is arranged between the outlet of the high-pressure cylinder inlet heat exchanger and the high-pressure cylinder outlet. The large compressed air energy storage air turbine can be rapidly and frequently started, the dynamic deviation and the steady-state deviation are small in the starting process, and the peak regulation requirement of a power grid can be met.

Description

Technical Field

[0001] The present application relates to the field of air energy storage technology, and in particular to an air turbine starting system and method for a large-scale compressed air energy storage power station. Background Art

[0002] Compressed air energy storage is an advanced technology that stores energy through compressed air. It has the advantages of large capacity and long service life. As an efficient and sustainable energy storage method, it has broad application prospects in renewable energy utilization and grid peak regulation.

[0003] Large-scale compressed air energy storage power stations have the characteristics of large system capacity, oversized air intake pipes, and poor control accuracy of medium and low pressure regulating valves. The currently commonly used high-pressure cylinder starting method has problems such as high high-pressure cylinder intake pressure and residual pressure due to large system capacity, which leads to large speed and load fluctuations and low control accuracy during the air turbine starting process. It is difficult to meet the grid's demand for frequent and rapid peak regulation of large-scale compressed air energy storage power stations. In order to meet the requirements of rapid and frequent start and stop of large-scale compressed air energy storage power stations and improve the control accuracy during the air turbine starting process, it is of great practical significance to carry out research on the air turbine starting method of large-scale compressed air energy storage power stations. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide an air turbine starting system and method for a large-scale compressed air energy storage power station, which can accurately control the air intake of the medium-pressure cylinder only by adjusting the high-precision medium-pressure starting regulating valve; it can achieve rapid and frequent starting of large-scale compressed air energy storage air turbines, and the dynamic deviation and steady-state deviation during the starting process are both small, which can meet the peak-shaving needs of the power grid.

[0005] To achieve the above objectives, this application provides the following technical solutions:

[0006] In a first aspect, the present application provides an air turbine starting system for a large compressed air energy storage power station, including a salt cavern, a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder, a high-pressure cylinder inlet heat exchanger, a medium-pressure cylinder inlet heat exchanger, a low-pressure cylinder inlet heat exchanger, a high-pressure heat exchange system temperature regulating valve, a medium-pressure heat exchange system temperature regulating valve, a low-pressure heat exchange system temperature regulating valve, a high-pressure main air valve, a high-pressure regulating valve 1, a high-pressure regulating valve 2, a medium-pressure main air valve, a medium-pressure starting regulating valve, a medium-pressure regulating valve 1, a medium-pressure regulating valve 2, a low-pressure main air valve, and a high-pressure bypass valve;

[0007] The high-pressure cylinder is connected to the high-pressure main gas valve through the high-pressure regulating valve 1 and the high-pressure regulating valve 2, the high-pressure main gas valve is connected to the high-pressure cylinder inlet heat exchanger, and the high-pressure cylinder inlet heat exchanger is connected to the salt cavern outlet;

[0008] The medium-pressure cylinder is connected to the medium-pressure main gas valve through the medium-pressure starting regulating valve, the medium-pressure regulating valve 1 and the medium-pressure regulating valve 2. The medium-pressure main gas valve is connected to the medium-pressure cylinder inlet heat exchanger. The medium-pressure cylinder inlet heat exchanger is connected to the high-pressure cylinder outlet.

[0009] The low-pressure cylinder is connected to the low-pressure cylinder inlet heat exchanger through a low-pressure main air valve, and the low-pressure cylinder inlet heat exchanger is connected to the medium-pressure cylinder outlet;

[0010] A high-pressure bypass valve is provided between the outlet of the high-pressure cylinder inlet heat exchanger and the outlet of the high-pressure cylinder.

[0011] In a second aspect, the present application provides a method for starting an air turbine of a large-scale compressed air energy storage power station, using the system as described above, comprising the following steps:

[0012] (1) High-pressure cylinder reverse warming: open the high-pressure bypass valve to 5%, pre-heat air into the high-pressure cylinder, and keep it for 30 minutes; adjust the high-pressure bypass valve to increase the air pressure in the high-pressure cylinder to 0.39-0.49MPa, and the cylinder temperature rise rate <50℃ / h; after reaching 120℃, close the high-pressure bypass valve to suffocate the cylinder, and keep it for 30 minutes; during the high-pressure cylinder reverse warming process, simultaneously adjust the opening of the high-pressure heat exchange system temperature regulating valve, the medium-pressure heat exchange system temperature regulating valve, and the low-pressure heat exchange system temperature regulating valve to ensure that the intake temperature of the high-pressure cylinder, the medium-pressure cylinder, and the low-pressure cylinder is within the required range;

[0013] (2) Locking: Select "medium pressure cylinder start", lock the air turbine, check that the high-pressure main air valve, medium-pressure main air valve, and low-pressure main air valve are fully open, the high-pressure bypass valve is in automatic mode, and the pressure before the medium-pressure main air valve is controlled at 0.2-0.3 MPa;

[0014] (3) Friction check: The target speed for friction check is 500r / min, the speed increase rate is 150r / min / min, and the medium-pressure start regulating valve is slowly opened; when the air turbine speed reaches 500r / min, start the friction check, check that all valves are closed, and the speed gradually decreases. Listen carefully on the spot to see if the sound inside the air turbine is normal, and check if the axial displacement is normal; during the friction check, do not let the air turbine speed drop to zero;

[0015] (4) Rush start: There are three cases according to the air turbine downtime. The first case is that if the air turbine downtime is ≥ 72 hours, the target speed is set to 3000 r / min and the speed increase rate is 1000 r / min / min, and the speed increase starts, and the medium-pressure start regulating valve continues to control the speed increase. The second case is that if the air turbine downtime is 10 hours ≤ the air turbine downtime < 72 hours, the target speed is set to 3000 r / min and the speed increase rate is 1200 r / min / min, and the speed increase starts, and the medium-pressure start regulating valve continues to control the speed increase. The third case is that if the air turbine downtime is < 10 hours, the target speed is set to 3000 r / min and the speed increase rate is 1500 r / min / min, and the speed increase starts, and the medium-pressure start regulating valve continues to control the speed increase.

[0016] (5) Grid-connected with initial load: After the DEH receives the synchronization request from the electrical generator, the air turbine speed is automatically controlled by the electrical synchronization gain; after grid connection, the unit carries an initial load of 15-20MW;

[0017] (6) Cylinder reversal: Set the load target value to 70MW and the load increase rate to 50MW / min. The load begins to increase. As the load increases, the medium-pressure start-up regulating valve and the high-pressure bypass valve are gradually closed, and the high-pressure regulating valve 1, high-pressure regulating valve 2, medium-pressure regulating valve 1, and medium-pressure regulating valve 2 are gradually opened. The unit load continues to increase until it reaches 70MW. The high-pressure regulating valve 1 and high-pressure regulating valve 2 are slightly opened, and the medium-pressure regulating valve 1 and medium-pressure regulating valve 2 are fully opened. Confirm that the medium-pressure start-up regulating valve and the high-pressure bypass valve are fully closed. After the load increase is completed, the medium-pressure cylinder intake mode has been reversed to the high-pressure cylinder and the medium-pressure cylinder intake mode.

[0018] (7) Load increase: At this time, since the intake pressure and temperature are close to the rated parameters, the "load increase rate" is selected as 150MW / min and the load is increased to the target load.

[0019] The medium-pressure cylinder starting method is adopted. The high-pressure cylinder does not take in air, and only the medium-pressure cylinder and the low-pressure cylinder take in air. The pressure before the medium-pressure main air valve is controlled at 0.2~0.3MPa through the high-pressure bypass valve.

[0020] A small-diameter medium-pressure starting regulating valve is used to control the air intake flow of the medium-pressure cylinder. The air intake volume of the medium-pressure cylinder can be accurately controlled by only adjusting the high-precision medium-pressure starting regulating valve.

[0021] After the air turbine is connected to the grid and carries load, the cylinder inversion method is adopted, and the medium-pressure cylinder air intake method is reversed to the high-pressure cylinder and medium-pressure cylinder joint air intake method, so as to realize the rapid increase and decrease of load.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: during the starting process, the high-pressure cylinder does not take in air, only the medium-pressure cylinder and the low-pressure cylinder take in air; the pressure before the medium-pressure main air valve is controlled at a relatively low pressure, about 0.2-0.3MPa, through the high-pressure bypass valve; at the same time, a small-diameter medium-pressure starting regulating valve is used to control the air intake flow of the medium-pressure cylinder, and the air intake amount of the medium-pressure cylinder is accurately controlled only by adjusting the high-precision medium-pressure starting regulating valve; it is beneficial to the stability of the speed and load during the starting process of the air turbine, and reduces the dynamic deviation and steady-state deviation during the starting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a schematic diagram of the system structure of this application.

[0025] Figure 2 It is a schematic diagram of the simulation results of this application.

[0026] Figure 1 Middle: 1-salt cave, 2-high-pressure heat exchange system, 3-high-pressure main air valve, 4-low-pressure heat exchange system temperature regulating valve, 5-low-pressure cylinder inlet heat exchanger, 6-high-pressure heat exchange system temperature regulating valve, 7-high-pressure cylinder, 8-high-pressure regulating valve one, 9-high-pressure regulating valve two, 10-low-pressure main air valve, 11-low-pressure cylinder, 12-high-pressure bypass valve, 13-medium-pressure regulating valve one, 14-medium-pressure regulating valve two, 15-medium-pressure start regulating valve, 16-medium-pressure cylinder, 17-medium-pressure heat exchange system temperature regulating valve, 18-medium-pressure cylinder inlet heat exchanger, 19-medium-pressure main air valve. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0028] The terms "comprises," "comprising," or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0029] The terms "first", "second", etc. are only used to distinguish one entity or operation from another entity or operation, and should not be understood as indicating or implying relative importance, nor should they be understood as requiring or implying any such actual relationship or order between these entities or operations.

[0030] Large-scale compressed air energy storage power stations have the characteristics of large system capacity, oversized air intake pipelines, and poor control accuracy of medium and low pressure regulating valves. The currently commonly used high-pressure cylinder starting method has problems such as high high-pressure cylinder intake pressure and residual pressure due to large system capacity, which leads to large speed and load fluctuations and low control accuracy during the air turbine starting process, making it difficult to meet the grid's demand for frequent and rapid peak regulation of large-scale compressed air energy storage power stations.

[0031] like Figure 1 As shown, the present invention proposes a method and system for starting an air turbine in a large-scale compressed air energy storage power station based on the shortcomings of the existing design. During the starting process, the high-pressure cylinder 7 does not take in air, and only the medium-pressure cylinder 16 and the low-pressure cylinder 11 take in air. The pressure before the medium-pressure main air valve 19 is controlled at a relatively low pressure of about 0.2-0.3MPa through the high-pressure bypass valve 12. At the same time, a small-diameter medium-pressure starting regulating valve 15 is used to control the air intake flow of the medium-pressure cylinder 16. Only by adjusting the high-precision medium-pressure starting regulating valve 15, the air intake amount of the medium-pressure cylinder 16 can be accurately controlled. This is beneficial to the stability of the speed and load during the starting process of the air turbine, and reduces the dynamic deviation and steady-state deviation during the starting process.

[0032] The present application provides an air turbine starting system for a large compressed air energy storage power station, comprising a salt cavern 1, a high-pressure cylinder 7, a medium-pressure cylinder 16, a low-pressure cylinder 11, a high-pressure cylinder inlet heat exchanger 2, a medium-pressure cylinder inlet heat exchanger 18, a low-pressure cylinder inlet heat exchanger 5, a high-pressure heat exchange system temperature regulating valve 6, a medium-pressure heat exchange system temperature regulating valve 17, a low-pressure heat exchange system temperature regulating valve 4, a high-pressure main air valve 3, a high-pressure regulating valve 1 8, a high-pressure regulating valve 2 9, a medium-pressure main air valve 19, a medium-pressure starting regulating valve 15, a medium-pressure regulating valve 1 13, a medium-pressure regulating valve 2 14, a low-pressure main air valve 10, and a high-pressure bypass valve 12;

[0033] The high-pressure cylinder 7 is connected to the high-pressure main gas valve 3 through the high-pressure regulating valve 1 8 and the high-pressure regulating valve 2 9, the high-pressure main gas valve 3 is connected to the high-pressure cylinder inlet heat exchanger 2, and the high-pressure cylinder inlet heat exchanger 2 is connected to the salt cavern 1 outlet;

[0034] The medium-pressure cylinder 16 is connected to the medium-pressure main air valve 19 through the medium-pressure start regulating valve 15, the medium-pressure regulating valve 1 13, and the medium-pressure regulating valve 2 14. The medium-pressure main air valve 19 is connected to the medium-pressure cylinder inlet heat exchanger 18, and the medium-pressure cylinder inlet heat exchanger 18 is connected to the outlet of the high-pressure cylinder 7;

[0035] The low-pressure cylinder 11 is connected to the low-pressure cylinder inlet heat exchanger 5 through the low-pressure main air valve 10, and the low-pressure cylinder inlet heat exchanger 5 is connected to the outlet of the medium-pressure cylinder 16;

[0036] A high-pressure bypass valve 12 is provided between the outlet of the high-pressure cylinder inlet heat exchanger 2 and the outlet of the high-pressure cylinder 7 .

[0037] The present application provides a method for starting an air turbine of a large-scale compressed air energy storage power station, using the system as described above, including the following steps:

[0038] (1) Reverse warming of high-pressure cylinder 7: open high-pressure bypass valve 12 to 5%, pre-warmed air enters high-pressure cylinder 7, and maintains for 30 minutes; adjust high-pressure bypass valve 12 to increase the air pressure in high-pressure cylinder 7 to 0.39-0.49MPa, and the cylinder temperature rise rate is less than 50℃ / h; after reaching 120℃, close high-pressure bypass valve 7 to suffocate the cylinder, and maintain for 30 minutes; during the reverse warming process of high-pressure cylinder 7, simultaneously adjust the opening of high-pressure heat exchange system temperature regulating valve 6, medium-pressure heat exchange system temperature regulating valve 17, and low-pressure heat exchange system temperature regulating valve 4 to ensure that the intake temperature of high-pressure cylinder 7, medium-pressure cylinder 16, and low-pressure cylinder 11 is within the required range;

[0039] (2) Locking: Select "medium pressure cylinder start", lock the air turbine, check that the high-pressure main air valve 3, the medium-pressure main air valve 19, and the low-pressure main air valve 10 are fully open, the high-pressure bypass valve 12 is automatically turned on, and the pressure before the medium-pressure main air valve 19 is controlled at 0.2-0.3MPa;

[0040] (3) Friction check: The target speed for friction check is 500r / min, the speed increase rate is 150r / min / min, and the medium-pressure start regulating valve 15 is slowly opened; when the air turbine speed reaches 500r / min, start the friction check, check that all valves are closed, the speed gradually decreases, listen carefully on the spot to see if the sound inside the air turbine is normal, and check if the axial displacement is normal; during the friction check, do not let the air turbine speed drop to zero;

[0041] (4) Rush start: There are three cases according to the air turbine shutdown time. The first case is that if the air turbine shutdown time is ≥ 72 hours, the target speed is set to 3000 r / min and the speed increase rate is 1000 r / min / min, and the speed increase starts, and the medium-pressure start regulating valve 15 continues to control the speed increase. The second case is that if the air turbine shutdown time is 10 hours ≤ the air turbine shutdown time < 72 hours, the target speed is set to 3000 r / min and the speed increase rate is 1200 r / min / min, and the speed increase starts, and the medium-pressure start regulating valve 15 continues to control the speed increase. The third case is that if the air turbine shutdown time is < 10 hours, the target speed is set to 3000 r / min and the speed increase rate is 1500 r / min / min, and the speed increase starts, and the medium-pressure start regulating valve 15 continues to control the speed increase.

[0042] (5) Grid-connected with initial load: After the DEH receives the synchronization request from the electrical generator, the air turbine speed is automatically controlled by the electrical synchronization gain; after grid connection, the unit carries an initial load of 15-20MW;

[0043] (6) Cylinder reversal: Set the load target value to 70MW, set the load increase rate to 50MW / min, and the load begins to increase. As the load increases, the medium-pressure start-up regulating valve 15 and the high-pressure bypass valve 12 are gradually closed, and the high-pressure regulating valves 1-8, 2-9, medium-pressure regulating valves 1-13, and 2-14 are gradually opened. The unit load continues to increase until it reaches 70MW, the high-pressure regulating valves 1-8 and 2-9 are slightly opened, and the medium-pressure regulating valves 1-13 and 2-14 are fully opened. Confirm that the medium-pressure start-up regulating valve 15 and the high-pressure bypass valve 12 are fully closed. After the load increase is completed, the air intake mode of the medium-pressure cylinder 16 has been reversed to the common air intake mode of the high-pressure cylinder 7 and the medium-pressure cylinder 16.

[0044] (7) Load increase: At this time, since the intake pressure and temperature are close to the rated parameters, the "load increase rate" is selected as 150MW / min and the load is increased to the target load.

[0045] The medium-pressure cylinder 16 starting method is adopted. The high-pressure cylinder 7 does not take in air, and only the medium-pressure cylinder 16 and the low-pressure cylinder 11 take in air. The pressure before the medium-pressure main air valve 19 is controlled at a relatively low pressure of about 0.2 to 0.3 MPa through the high-pressure bypass valve 12, which is beneficial to reducing the dynamic deviation and steady-state deviation of the speed during the starting process of the air turbine.

[0046] A small-diameter medium-pressure starting regulating valve 15 is used to control the air intake flow of the medium-pressure cylinder 16. The air intake of the medium-pressure cylinder 16 can be accurately controlled only by adjusting the high-precision medium-pressure starting regulating valve 15, which is beneficial to the speed and load stability during the start-up of the air turbine, and solves the problem of low adjustment accuracy of large-diameter medium-pressure regulating valves 1-13 and medium-pressure regulating valves 2-14 in large-scale compressed air energy storage power stations.

[0047] After the air turbine is connected to the grid and carries the load, the cylinder inversion method is adopted, and the air intake method of the medium-pressure cylinder 16 is inverted into the common air intake method of the high-pressure cylinder 7 and the medium-pressure cylinder 16, so as to realize the rapid rise and fall of the load.

[0048] like Figure 2 As shown in FIG. 1 , a schematic diagram of the simulation results of the speed and power relative values ​​of the air turbine startup process of a large-scale compressed air energy storage power station of the present application is shown. Figure 2 It can be known that in the present application, the high-pressure cylinder does not take in air during the starting process, and only the medium-pressure cylinder and the low-pressure cylinder take in air; only the high-precision medium-pressure starting regulating valve is adjusted, and the cylinder is reversed, etc., so that the speed and load during the starting process of the air turbine can be quickly stabilized, and the dynamic deviation and steady-state deviation during the starting process are both small.

[0049] The above description is only an embodiment of the present application and is not intended to limit the protection scope of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A large-scale compressed air energy storage power station air turbine starting system, characterized in that: Including salt cavern, high-pressure cylinder, medium-pressure cylinder, low-pressure cylinder, high-pressure cylinder inlet heat exchanger, medium-pressure cylinder inlet heat exchanger, low-pressure cylinder inlet heat exchanger, high-pressure heat exchange system temperature regulating valve, medium-pressure heat exchange system temperature regulating valve, low-pressure heat exchange system temperature regulating valve, high-pressure main air valve, high-pressure regulating valve 1, high-pressure regulating valve 2, medium-pressure main air valve, medium-pressure starting regulating valve, medium-pressure regulating valve 1, medium-pressure regulating valve 2, low-pressure main air valve, high-pressure bypass valve; The high-pressure cylinder is connected to the high-pressure main gas valve through the high-pressure regulating valve 1 and the high-pressure regulating valve 2, the high-pressure main gas valve is connected to the high-pressure cylinder inlet heat exchanger, and the high-pressure cylinder inlet heat exchanger is connected to the salt cavern outlet; The medium-pressure cylinder is connected to the medium-pressure main gas valve through the medium-pressure starting regulating valve, the medium-pressure regulating valve 1 and the medium-pressure regulating valve 2. The medium-pressure main gas valve is connected to the medium-pressure cylinder inlet heat exchanger. The medium-pressure cylinder inlet heat exchanger is connected to the high-pressure cylinder outlet. The low-pressure cylinder is connected to the low-pressure cylinder inlet heat exchanger through a low-pressure main air valve, and the low-pressure cylinder inlet heat exchanger is connected to the medium-pressure cylinder outlet; A high-pressure bypass valve is provided between the outlet of the high-pressure cylinder inlet heat exchanger and the outlet of the high-pressure cylinder.

2. A method for starting an air turbine in a large compressed air energy storage power station, using the system as claimed in claim 1, characterized in that: The steps include: (1) High-pressure cylinder reverse warming: open the high-pressure bypass valve to 5%, pre-heat air into the high-pressure cylinder, and keep it for 30 minutes; adjust the high-pressure bypass valve to increase the air pressure in the high-pressure cylinder to 0.39-0.49MPa, and the cylinder temperature rise rate <50℃ / h; after reaching 120℃, close the high-pressure bypass valve to suffocate the cylinder, and keep it for 30 minutes; during the high-pressure cylinder reverse warming process, simultaneously adjust the opening of the high-pressure heat exchange system temperature regulating valve, the medium-pressure heat exchange system temperature regulating valve, and the low-pressure heat exchange system temperature regulating valve to ensure that the intake temperature of the high-pressure cylinder, the medium-pressure cylinder, and the low-pressure cylinder is within the required range; (2) Locking: Select "medium pressure cylinder start", lock the air turbine, check that the high-pressure main air valve, medium-pressure main air valve, and low-pressure main air valve are fully open, the high-pressure bypass valve is in automatic mode, and the pressure before the medium-pressure main air valve is controlled at 0.2-0.3 MPa; (3) Friction check: The target speed for friction check is 500 r / min, the speed increase rate is 150 r / min / min, and the medium-pressure start regulating valve is slowly opened; when the air turbine speed reaches 500 r / min, start the friction check, check that all valves are closed, and the speed gradually decreases. Listen carefully on the spot to see if the sound inside the air turbine is normal, and check if the axial displacement is normal; During the friction check, do not allow the air turbine speed to drop to zero; (4) Rush start: There are three cases according to the air turbine downtime. The first case is that if the air turbine downtime is ≥ 72 hours, the target speed is set to 3000 r / min and the speed increase rate is 1000 r / min / min, and the speed increase starts, and the medium-pressure start regulating valve continues to control the speed increase. The second case is that if the air turbine downtime is 10 hours ≤ the air turbine downtime < 72 hours, the target speed is set to 3000 r / min and the speed increase rate is 1200 r / min / min, and the speed increase starts, and the medium-pressure start regulating valve continues to control the speed increase. The third case is that if the air turbine downtime is < 10 hours, the target speed is set to 3000 r / min and the speed increase rate is 1500 r / min / min, and the speed increase starts, and the medium-pressure start regulating valve continues to control the speed increase. (5) Grid-connected with initial load: After the DEH receives the synchronization request from the electrical generator, the air turbine speed is automatically controlled by the electrical synchronization gain; after grid connection, the unit carries an initial load of 15-20MW; (6) Cylinder reversal: Set the load target value to 70MW and the load increase rate to 50MW / min. The load begins to increase. As the load increases, the medium-pressure start-up regulating valve and the high-pressure bypass valve are gradually closed, and the high-pressure regulating valve 1, high-pressure regulating valve 2, medium-pressure regulating valve 1, and medium-pressure regulating valve 2 are gradually opened. The unit load continues to increase until it reaches 70MW. The high-pressure regulating valve 1 and high-pressure regulating valve 2 are slightly opened, and the medium-pressure regulating valve 1 and medium-pressure regulating valve 2 are fully opened. Confirm that the medium-pressure start-up regulating valve and the high-pressure bypass valve are fully closed. After the load increase is completed, the medium-pressure cylinder intake mode has been reversed to the high-pressure cylinder and the medium-pressure cylinder intake mode. (7) Load increase: At this time, since the intake pressure and temperature are close to the rated parameters, the "load increase rate" is selected as 150MW / min and the load is increased to the target load.

3. A method for starting an air turbine in a large-scale compressed air energy storage power station according to claim 2, characterized in that: The medium-pressure cylinder starting method is adopted. The high-pressure cylinder does not take in air, and only the medium-pressure cylinder and the low-pressure cylinder take in air. The pressure before the medium-pressure main air valve is controlled at 0.2~0.3MPa through the high-pressure bypass valve.

4. A large-scale compressed air energy storage power station air turbine starting method according to claim 2, characterized in that: A small-diameter medium-pressure starting regulating valve is used to control the air intake flow of the medium-pressure cylinder. The air intake volume of the medium-pressure cylinder can be accurately controlled by only adjusting the high-precision medium-pressure starting regulating valve.

5. The air turbine starting method of a large-scale compressed air energy storage power station according to claim 2, characterized in that: After the air turbine is connected to the grid and carries load, the cylinder inversion method is adopted, and the medium-pressure cylinder air intake method is reversed to the high-pressure cylinder and medium-pressure cylinder joint air intake method, so as to realize the rapid increase and decrease of load.

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