Compressed air energy storage power station electrical wiring system with phase modifier function

Abstract

The invention discloses a compressed air energy storage power station electrical wiring system with a phase modifier function, and belongs to the field of compressed air energy storage. Comprising a motor generator with a phase modifier function, a generator outlet circuit breaker connected with the motor generator, a main transformer of which one end is connected with the generator outlet circuit breaker, a high-voltage plant transformer connected with the main transformer, and a high-voltage plant bus section connected with the high-voltage plant transformer, the static starting device is connected with the high-voltage station bus section, the static starting switching device is connected with the static starting device, the compressor bus section is connected with the static starting switching device, the compressor motors are arranged in parallel with the compressor bus section, and one end of each compressor transformer is connected with one compressor motor. The other ends of the main transformer and the compressor transformer are connected to a power grid; and the static starting switching device is connected with the motor generator. According to the invention, efficient and low-cost energy storage can be realized, and the reliability of a large compressed air energy storage power station is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of compressed air energy storage, and in particular to an electrical wiring system for a compressed air energy storage power station with a phase regulator function. Background Art

[0002] The compressed air energy storage system uses high-pressure air as a form of energy storage and generates electricity by expanding the high-pressure air when needed. It has a series of advantages such as high safety, large energy storage capacity, long discharge time, comprehensive utilization of cold, heat and electricity, and long service life. It has gradually become another technology suitable for large-scale energy storage after pumped storage.

[0003] In current engineering practices for large-capacity compressed air energy storage power stations, the compressor drive unit and the expansion generator generally adopt a discrete, independent configuration. Research has shown that this configuration model will lead to two prominent problems: first, each power device needs to be purchased independently and equipped with a dedicated installation space, significantly increasing the system's footprint; second, the redundant configuration of ancillary facilities (including but not limited to infrastructure, control systems, and auxiliary equipment) will lead to increased project investment costs. It is worth noting that as the power grid's demand for dynamic reactive power compensation increases, the possibility of introducing phase-shifting units will further exacerbate the dual pressures of space and cost, posing a severe challenge to the economic viability of the power station. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an electrical wiring system for a compressed air energy storage power station with phase-shifting function, which adapts to and meets the operating needs of various systems in large-scale compressed air energy storage power stations, achieves energy storage goals efficiently and at low cost, and improves the reliability of large-scale compressed air energy storage power stations.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] An electrical wiring system for a compressed air energy storage power station with a phase regulator function includes an electric generator with a phase regulator function, a generator outlet circuit breaker connected to the electric generator, a main transformer connected to the generator outlet circuit breaker at one end, a high-voltage plant transformer connected to the main transformer, a high-voltage plant bus section connected to the high-voltage plant transformer, a static starting device connected to the high-voltage plant bus section, a static starting switching device connected to the static starting device, a compressor bus section connected to the static starting switching device, a plurality of compressor motors arranged in parallel with the compressor bus section, and a compressor transformer connected to one of the compressor motors at one end; the other ends of the main transformer and the compressor transformer are connected to the power grid; and the static starting switching device is connected to the electric generator.

[0007] A further improvement of the technical solution of the present invention is that the design and manufacture of the electric generator respectively meet the technical parameters of the motor, generator and phase regulator; the design and manufacture of the electric generator excitation system respectively meet the operating requirements of the motor, generator and phase regulator.

[0008] A further improvement of the technical solution of the present invention is that: in the large-capacity compressor configuration scheme in the compressed air energy storage power station, one compression line is set up, and a total of three compressors are configured; among them, the #1 compressor is not configured with a separate electric motor, but shares an electric generator with the expansion unit; the #2 compressor is equipped with the #2 compressor motor; and the #3 compressor is equipped with the #3 compressor motor.

[0009] A further improvement of the technical solution of the present invention is that the electric generator, the #2 compressor motor and the #3 compressor motor share a set of static starting devices, which are connected to the electric generator outlet and the compressor bus section through a static starting switching device. By switching between switches, the electric generator connected to the #1 compressor, the #2 compressor motor and the #3 compressor motor are started in turn, and finally the #3 compressor motor is driven for variable frequency operation.

[0010] A further improvement of the technical solution of the present invention is that the electric generator adopts a double-axle synchronous motor, the #1 compressor, the electric generator and the expander are coaxially arranged, a first clutch is set between the electric generator and the #1 compressor, and a second clutch is set between the electric generator and the expander.

[0011] A further improvement of the technical solution of the present invention is that: a first switch is provided in the static starting device, and the first switch is connected to the static starting switching device; a second switch is provided between the electric generator and the static starting switching device; a third switch is provided in the static starting switching device, and a fourth switch is provided between the static starting switching device and the compressor bus section, and the third switch is connected to the fourth switch; a fifth switch is provided between the compressor bus section and the #2 compressor motor; a seventh switch is provided between the compressor bus section and the #3 compressor motor; and a sixth switch is provided between the #2 compressor motor and the compressor transformer.

[0012] A further improvement of the technical solution of the present invention is that: in the compressed air energy storage power station energy storage mode, the electric generator switches to the motor mode to drive the #1 compressor to work, and the power supply of the unit is connected after the high-voltage plant bus section is stepped down through the main transformer and the high-voltage plant transformer;

[0013] Under the energy release condition of the compressed air energy storage power station, the electric generator switches to generator operation. The unit is connected to the high-voltage plant transformer after being boosted by the main transformer through the generator output circuit breaker, and then connected to the high-voltage plant bus section. The outgoing line from the high-voltage plant bus section is connected to the power grid, realizing energy storage and sending electricity to the power grid; the electric generator can be disconnected from the expander for long-term phase adjustment operation, thereby improving the unit's ability to regulate the stability of the power grid and the quality of power.

[0014] A further improvement of the technical solution of the present invention is that: in the energy storage mode of the compressed air energy storage power station, the electric generator switches to the motor mode, and the starting method and starting process of the electric generator in the motor mode are as follows:

[0015] Starting method: A static starting device based on IGCT / IGBT modules is used to build an AC-DC-AC three-level converter. The first and second switches are closed, and the output frequency is increased from 0Hz to 50Hz in stages to achieve soft starting.

[0016] The startup process is divided into three stages:

[0017] (1) Initial stage - pre-excitation establishment: Apply low-frequency voltage to gradually build up the rotor magnetic field, with the excitation current fluctuation range ≤3%;

[0018] (2) Acceleration phase - torque ramp-up: The frequency is increased according to the exponential acceleration curve, and the V / f ratio and torque compensation are adjusted synchronously to ensure that the electromagnetic torque matches the compressor load curve;

[0019] (3) Grid-connected stage - Quasi-synchronous switching: The phase-locked loop is triggered to synchronize the terminal voltage with the grid phase. During the switching process, the DC bus voltage ripple is suppressed within ±1%;

[0020] During the overall starting process, the starting current is limited to 1.2 times the rated current.

[0021] The further improvement of the technical solution of the present invention is:

[0022] The speed when pre-excitation is established is 0-5% of the rated speed;

[0023] The frequency when applying low-frequency voltage is 0.3-0.5 Hz;

[0024] The speed during torque ramp-up is 5-90% of the rated speed;

[0025] In the exponential acceleration curve, a=k(1-e -tτ ),τ=15s;

[0026] The speed during quasi-synchronous switching is 90-100% of the rated speed;

[0027] When the phase-locked loop is triggered to synchronize the terminal voltage with the grid phase, Δθ is less than 2°.

[0028] A further improvement of the technical solution of the present invention is that: under the energy release condition of the compressed air energy storage power station, the electric generator switches to the generator mode. The starting method and starting process of the electric generator in the generator mode are as follows:

[0029] (1) Mode switch confirmation: Confirm that the unit has switched from motor mode to generator mode;

[0030] (2) Control system settings: complete the self-test and parameter settings of the power generation control unit;

[0031] (3) Start the expander auxiliary system: Start the expander auxiliary system;

[0032] (4) Speed ​​increase: the unit speed increases gradually from 0 to 3000 rpm;

[0033] (5) Preparation for grid connection: After reaching the rated speed, the synchronization test will be automatically performed.

[0034] Due to the adoption of the above technical solution, the technical advancements achieved by the present invention are:

[0035] 1. The electrical wiring system of the compressed air energy storage power station with phase-shifting function provided by the present invention adopts an electric generator with phase-shifting function, which improves the equipment integration, shares some auxiliary equipment such as the cooling system, reduces the equipment cost, saves floor space, optimizes operation and maintenance costs, can adapt to and meet the operation needs of various systems of large-scale compressed air energy storage power stations, achieves energy storage goals efficiently and at low cost, and improves the reliability of large-scale compressed air energy storage power stations.

[0036] 2. The present invention adopts an electric generator with phase-shifting function. The compressed air energy storage power station can participate in power market transactions in the peak regulation field (capacity market), voltage regulation field (ancillary services) and spare capacity field (capacity reserve market), innovatively realize the "one machine, three domains" compound profit model, and improve the profit level of the power station.

[0037] 3. The present invention innovatively adopts the coaxial topology structure of "#1 compressor-motor generator-expander". Compared with the coaxial topology structure of "#3 compressor-#2 compressor-#1 compressor-motor generator-expander", it shortens the unit shaft system length, reduces the vibration amplitude, and effectively improves the rotor dynamics stability.

[0038] 4. In the present invention, the #2 compressor motor, the #3 compressor motor and the #1 compressor share a static starting device (SFC), which saves engineering costs while meeting process operation requirements.

[0039] 5. The present invention optimizes the electrical design to the maximum extent, and has the advantages of simple system design, compact design, and small footprint.

[0040] 6. The present invention not only improves the reliability of power station operation, the convenience of construction and installation, and equipment overhaul and maintenance, but also saves project costs and facilitates engineering application and promotion.

[0041] 7. The present invention can be widely used in the fields of power generation, transmission and distribution of large-scale compressed air energy storage power stations. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive efforts.

[0043] Figure 1 This is a schematic diagram of an electrical wiring system for a compressed air energy storage power station with a phase regulator function provided in an embodiment of the present invention;

[0044] Among them, 1. Electric generator; 2. Generator output circuit breaker; 3. Main transformer; 4. High-voltage plant transformer; 5. High-voltage plant bus section; 6. Static starting device; 7. Static starting switching device; 8. Compressor transformer; 9. #2 compressor motor; 10. #3 compressor motor; 11. Compressor bus section; S1, first switch; S2, second switch; S3, third switch; S4, fourth switch; S5, fifth switch; S6, sixth switch; S7, seventh switch. DETAILED DESCRIPTION

[0045] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products or apparatuses.

[0046] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "several" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0048] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0049] like Figure 1 As shown, an electrical wiring system for a compressed air energy storage power station with a phase regulator function includes an electric generator 1 with a phase regulator function, a generator outlet circuit breaker 2 connected to the electric generator 1, a main transformer 3 connected to the generator outlet circuit breaker 2 (GCB) at one end, a high-voltage plant transformer 4 connected to the main transformer 3, a high-voltage plant bus section 5 connected to the high-voltage plant transformer 4, a static starting device 6 (SFC) connected to the high-voltage plant bus section 5, a static starting switching device 7 connected to the static starting device 6, a compressor bus section 11 connected to the static starting switching device 7, a plurality of compressor motors arranged in parallel with the compressor bus section 11, and a compressor transformer 8 connected to one compressor motor at one end; the other ends of the main transformer 3 and the compressor transformer 8 are connected to the power grid; and the static starting switching device 7 is connected to the electric generator 1.

[0050] Furthermore, the motor generator 1 is designed and manufactured to meet the technical parameters of the motor, generator and phase regulator, and the motor generator excitation system is designed and manufactured to meet the operating requirements of the motor, generator and phase regulator. The entire system is equipped with one motor generator 1.

[0051] Furthermore, the high-capacity compressor configuration within the compressed air energy storage power station features a single compression line with three compressors. The first compressor (compressor #1) does not have its own motor, but instead shares a motor-generator (MG) 1 with the expander, saving construction costs. Compressor #2 is equipped with compressor motor 9, and compressor #3 is equipped with compressor motor 10.

[0052] Furthermore, the electric generator 1, the #2 compressor motor 9 and the #3 compressor motor 10 share a set of static starting devices 6 (SFC), which are connected to the outlet of the electric generator 1 and the compressor bus section 11 through the static starting switching device 7. By switching between the switches, the electric generator 1, the #2 compressor motor 9 and the #3 compressor motor 10 connected to the #1 compressor are started in turn, and finally the #3 compressor motor 10 is driven to operate with variable frequency to meet the process operation requirements.

[0053] Furthermore, the motor generator 1 adopts a double-axle synchronous motor, the #1 compressor, the motor generator 1 and the expander are coaxially arranged, a first clutch is set between the motor generator 1 and the #1 compressor, and a second clutch is set between the motor generator 1 and the expander.

[0054] Furthermore, a first switch S1 is provided in the static starting device 6 (SFC), and the first switch S1 is connected to the static starting switching device 7; a second switch S2 is provided between the electric generator 1 and the static starting switching device 7; a third switch S3 is provided in the static starting switching device 7, and a fourth switch S4 is provided between the static starting switching device 7 and the compressor bus section 11, and the third switch S3 is connected to the fourth switch S4; a fifth switch S5 is provided between the compressor bus section 11 and the #2 compressor motor 9; a seventh switch S7 is provided between the compressor bus section 11 and the #3 compressor motor 10; and a sixth switch S6 is provided between the #2 compressor motor 9 and the compressor transformer 8.

[0055] Furthermore, in the compressed air energy storage power station energy storage mode, the electric generator 1 switches to the motor mode to drive the #1 compressor to work, and the unit power supply is connected from the high-voltage plant bus section 5 after being stepped down by the main transformer 3 and the high-voltage plant transformer 4;

[0056] Under the energy release condition of the compressed air energy storage power station, the electric generator 1 switches to generator operation. The unit is stepped up by the main transformer 3 through the generator output circuit breaker 2 (GCB) and then connected to the high-voltage plant transformer 4, and then connected to the high-voltage plant bus section 5. The outgoing line from the high-voltage plant bus section 5 is connected to the power grid, realizing the energy storage and power generation to be sent to the power grid; the electric generator 1 can be disconnected from the expander and operate in phase adjustment for a long time, improving the unit's ability to regulate the stability of the power grid and the quality of power.

[0057] It should be noted that the unit here refers to a complete set of units, that is, an electric generator set. When storing energy, it runs under the motor working condition and is generally no longer called an electric generator set. Similarly, when releasing energy, it runs under the generator working condition and is generally no longer called an electric generator set. When it is disconnected from the expander and runs under the phase-shifting condition, it is no longer called an electric generator set. They are collectively referred to as units.

[0058] Furthermore, in the energy storage mode of the compressed air energy storage power station, the electric generator 1 switches to the motor mode. The starting method and starting process of the electric generator 1 in the motor mode are as follows:

[0059] Starting method: A static starting device 6 of an AC-DC-AC three-level converter based on IGCT / IGBT modules is used. The first switch S1 and the second switch S2 are closed, and the output frequency is increased from 0 Hz to 50 Hz in stages to achieve soft starting.

[0060] The startup process is divided into the following three stages:

[0061] (1) Initial stage - pre-excitation establishment (0-5% rated speed): Apply low-frequency voltage (0.3-0.5 Hz) to gradually establish the rotor magnetic field, and the excitation current fluctuation range is ≤3%.

[0062] (2) Acceleration stage - torque ramp-up (5-90% rated speed): According to the exponential acceleration curve (a = k (1-e -tτ ),τ=15s) to increase the frequency and adjust the V / f ratio and torque compensation synchronously to ensure that the electromagnetic torque matches the compressor load curve.

[0063] (3) Grid-connected stage - quasi-synchronous switching (90-100% rated speed): The phase-locked loop (PLL) is triggered to synchronize the terminal voltage with the grid phase (Δθ < 2°). During the switching process, the DC bus voltage ripple is suppressed within ±1%.

[0064] During the overall startup process, the starting current is limited to 1.2 times the rated current, significantly reducing the demand for the grid's short-circuit capacity.

[0065] Furthermore, the motors of the three compressors (including: the motor generator 1 connected to the #1 compressor, the #2 compressor motor 9, and the #3 compressor motor 10) share a set of static starting devices 6 (SFC), which are connected to the motor generator 1 outlet and the compressor bus section 11 through the static starting switching device 7. After the motor of the #1 compressor is started according to the above-mentioned starting method and starting process, the second switch S2 is opened, and the third switch S3, the fourth switch S4, and the fifth switch S5 are closed. The #2 compressor motor 9 is also started. The fifth switch S5 and the sixth switch S6 are switched in parallel. After synchronization is detected, the fifth switch S5 is opened, and the #2 compressor motor 9 is switched to be powered by the compressor transformer 8; then the seventh switch S7 is closed, and the static starting device 6 (SFC) drives the #3 compressor motor 10 to operate at a variable frequency to meet the process operation requirements.

[0066] Furthermore, under the energy release condition of the compressed air energy storage power station, the motor generator 1 switches to the generator mode. The starting method and starting process of the motor generator 1 in the generator mode are as follows:

[0067] (1) Mode switch confirmation: Confirm that the unit has switched from motor mode to generator mode;

[0068] (2) Control system settings: complete the self-test and parameter settings of the power generation control unit;

[0069] (3) Start the expander auxiliary system: Start the expander auxiliary system;

[0070] (4) Speed ​​increase: the unit speed increases gradually from 0 to 3000 rpm;

[0071] (5) Preparation for grid connection: After reaching the rated speed, the synchronization test will be automatically performed.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above 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 invention.

Claims

1. An electrical wiring system for a compressed air energy storage power station with phase-shifting function, characterized by: The invention comprises an electric generator (1) having a phase-shifting function, a generator outlet circuit breaker (2) connected to the electric generator (1), a main transformer (3) connected to the generator outlet circuit breaker (2) at one end, a high-voltage plant transformer (4) connected to the main transformer (3), a high-voltage plant bus section (5) connected to the high-voltage plant transformer (4), a static starting device (6) connected to the high-voltage plant bus section (5), a static starting switching device (7) connected to the static starting device (6), a compressor bus section (11) connected to the static starting switching device (7), a plurality of compressor motors arranged in parallel with the compressor bus section (11), and a compressor transformer (8) connected to one compressor motor at one end; the other ends of the main transformer (3) and the compressor transformer (8) are connected to a power grid; and the static starting switching device (7) is connected to the electric generator (1).

2. The electrical wiring system for a compressed air energy storage power station with phase modulator function according to claim 1, characterized in that: The motor generator (1) is designed and manufactured to meet the technical parameters of the motor, generator and phase regulator respectively; the motor generator excitation system is designed and manufactured to meet the operating requirements of the motor, generator and phase regulator respectively.

3. The electrical wiring system for a compressed air energy storage power station with phase modulator function according to claim 1, characterized in that: The large-capacity compressor configuration scheme in the compressed air energy storage power station sets up one compression line with a total of three compressors; The #1 compressor is not equipped with a separate motor, but shares a motor generator (1) with the expansion unit; the #2 compressor is equipped with a #2 compressor motor (9); and the #3 compressor is equipped with a #3 compressor motor (10).

4. The electrical wiring system for a compressed air energy storage power station with phase modulator function according to claim 3, characterized in that: The electric generator (1), the #2 compressor motor (9) and the #3 compressor motor (10) share a set of static starting devices (6), which are connected to the outlet of the electric generator (1) and the compressor bus section (11) through a static starting switching device (7). By switching between the switches, the electric generator (1) connected to the #1 compressor, the #2 compressor motor (9) and the #3 compressor motor (10) are started in sequence, and finally the #3 compressor motor (10) is driven to operate with variable frequency.

5. The electrical wiring system for a compressed air energy storage power station with phase modulator function according to claim 3, characterized in that: The motor generator (1) adopts a double-axle synchronous motor, the #1 compressor, the motor generator (1) and the expander are coaxially arranged, a first clutch is provided between the motor generator (1) and the #1 compressor, and a second clutch is provided between the motor generator (1) and the expander.

6. The electrical wiring system for a compressed air energy storage power station with phase modulator function according to claim 3, characterized in that: A first switch (S1) is provided in the static starting device (6), and the first switch (S1) is connected to the static starting switching device (7); a second switch (S2) is provided between the electric generator (1) and the static starting switching device (7); a third switch (S3) is provided in the static starting switching device (7), and a fourth switch (S4) is provided between the static starting switching device (7) and the compressor bus section (11), and the third switch (S3) is connected to the fourth switch (S4); a fifth switch (S5) is provided between the compressor bus section (11) and the #2 compressor motor (9); a seventh switch (S7) is provided between the compressor bus section (11) and the #3 compressor motor (10); and a sixth switch (S6) is provided between the #2 compressor motor (9) and the compressor transformer (8).

7. The electrical wiring system for a compressed air energy storage power station with phase modulator function according to claim 1, characterized in that: In the energy storage mode of the compressed air energy storage power station, the electric generator (1) switches to the motor mode to drive the #1 compressor to work, and the power supply of the unit is connected after the voltage is reduced by the high-voltage plant bus section (5) through the main transformer (3) and the high-voltage plant transformer (4); Under the energy release condition of the compressed air energy storage power station, the electric generator (1) switches to generator operation, the unit is stepped up by the main transformer (3) through the generator outlet circuit breaker (2), and then connected to the high-voltage plant transformer (4), and then connected to the high-voltage plant bus section (5), and the outgoing line from the high-voltage plant bus section (5) is connected to the power grid, so that the energy storage and the generated electric energy are sent to the power grid; the electric generator (1) can be disconnected from the expander and operate in phase adjustment for a long time, thereby improving the unit's control capability for the stability of the power grid and the quality of electric energy.

8. The electrical wiring system for a compressed air energy storage power station with phase modulator function according to claim 7, characterized in that: In the energy storage mode of the compressed air energy storage power station, the electric generator (1) switches to the motor mode. The starting method and starting process of the electric generator (1) in the motor mode are as follows: Starting method: using a static starting device (6) of an AC-DC-AC three-level converter based on an IGCT / IGBT module, closing a first switch (S1) and a second switch (S2), and increasing the output frequency from 0 Hz to 50 Hz in stages to achieve soft starting; The startup process is divided into three stages: (1) Initial stage - pre-excitation establishment: Apply low-frequency voltage to gradually build up the rotor magnetic field, with the excitation current fluctuation range ≤3%; (2) Acceleration phase - torque ramp-up: The frequency is increased according to the exponential acceleration curve, and the V / f ratio and torque compensation are adjusted synchronously to ensure that the electromagnetic torque matches the compressor load curve; (3) Grid-connected stage - Quasi-synchronous switching: The phase-locked loop is triggered to synchronize the terminal voltage with the grid phase. During the switching process, the DC bus voltage ripple is suppressed within ±1%; During the overall starting process, the starting current is limited to 1.2 times the rated current.

9. The electrical wiring system for a compressed air energy storage power station with phase modulator function according to claim 8, characterized in that: The speed when pre-excitation is established is 0-5% of the rated speed; The frequency when applying low-frequency voltage is 0.3-0.5 Hz; The speed during torque ramp-up is 5-90% of the rated speed; In the exponential acceleration curve, a=k(1-e -tτ ),τ=15s; The speed during quasi-synchronous switching is 90-100% of the rated speed; When the phase-locked loop is triggered to synchronize the terminal voltage with the grid phase, Δθ is less than 2°.

10. The electrical wiring system for a compressed air energy storage power station with phase modulator function according to claim 7, characterized in that: Under the energy release condition of the compressed air energy storage power station, the electric generator (1) switches to the generator condition. The starting method and starting process of the electric generator (1) under the generator mode are as follows: (1) Mode switch confirmation: Confirm that the unit has switched from motor mode to generator mode; (2) Control system settings: complete the self-test and parameter settings of the power generation control unit; (3) Start the expander auxiliary system: Start the expander auxiliary system; (4) Speed ​​increase: the unit speed increases gradually from 0 to 3000 rpm; (5) Preparation for grid connection: After reaching the rated speed, the synchronization test will be automatically performed.

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