An integrated regulating power station based on compressed air energy storage technology

Abstract

This invention discloses an integrated regulating power station based on compressed air energy storage technology, belonging to the field of energy storage technology. The power station includes: a compressor unit, an expansion generator unit, a heat exchanger unit, a thermal storage unit, an air storage unit, and a reuse generator unit. The air turbine of the regulating power station is connected to the reuse generator via a clutch. The reuse generator is connected to the external 220kV power grid via a first switch, and to the external 10kV power grid via a second switch. The power station operates in three modes: phase-shifting mode, parallel energy storage and phase-shifting mode, and power generation mode. This invention provides three operating modes: power generation, phase shifting, and parallel energy storage and phase shifting, expanding the traditional compressed air energy storage's limited energy storage and power generation modes. It enables 24-hour uninterrupted use of the generator unit, increases the frequency of power station equipment use, improves the stability support capability of the power grid, and simultaneously increases the operating time of the reuse generator, reducing equipment idle rate and effectively solving the problem of reduced equipment lifespan caused by equipment start-up and shutdown.

Description

Technical Field

[0001] This invention belongs to the field of energy storage technology, and in particular relates to an integrated regulating power station based on compressed air energy storage technology. Background Technology

[0002] With the increasing penetration rate of new energy sources, the power system will exhibit "dual high" characteristics—a high proportion of renewable energy and a high proportion of power electronic equipment connected. This "dual high" phenomenon leads to both temporal and spatial imbalances in power supply. Traditional power generation and consumption require real-time balance, while wind and solar power generation is intermittent, fluctuating, and random, resulting in temporal imbalances. Furthermore, my country's northern and central regions are rich in wind and solar resources, while load centers are mainly located in the central and eastern regions, leading to spatial mismatches. On the other hand, the increased proportion of DC power in the system also reduces the system inertia and short-circuit capacity of the synchronous AC grid, weakening its disturbance rejection capability and making fault characteristics and cascading reactions more complex, posing challenges to the safe operation of the system.

[0003] With the increasingly prominent "high-energy-consuming and high-polluting" characteristics of the new power system, the demand for new energy storage technologies with long lifespan, high security, and physical rotational inertia is becoming increasingly urgent. Compressed air energy storage (CASS) possesses characteristics such as rapid start-up and shutdown, power ramping, and wide-range active and reactive power regulation, making it a potential source of flexible incremental power regulation. It can also serve as a regulating power source for "wind and solar green power transmission," facilitating the transmission of clean and low-carbon electricity from the "Three Norths" region to the central and eastern regions. Furthermore, CASS power stations, equipped with air turbines and synchronous generator sets, are important future sources of rotational inertia. Like thermal power plants, they are synchronous generators with consistent reactive power response characteristics, enhancing the system's short-circuit capacity. Therefore, as a long-term physical energy storage method, CASS power stations are designed and developed into integrated regulating power stations based on CASS technology. These integrated regulating power stations provide both inertia support and reactive power response to the system, effectively addressing the "high-energy-consuming and high-polluting" problems in the power system. Summary of the Invention

[0004] In view of the above-mentioned problems, the present invention discloses an integrated regulating power station based on compressed air energy storage technology.

[0005] The present invention adopts the following technical solution:

[0006] An integrated regulating power station based on compressed air energy storage technology, the power station comprising: a compressor unit, an expander generator unit, a heat exchanger unit, a thermal storage unit, an air storage unit, and a reuse generator unit;

[0007] The compressor unit includes a compressor and an electric motor, and the compressor unit is used for compressed air energy storage.

[0008] The expander generator set includes an air turbine, and the expander generator set is used to generate electricity through the air turbine;

[0009] The heat exchange unit includes a heat exchanger and a reheater. The heat exchanger is used to cool the compressed air, and the reheater heats the compressed air for expansion and power generation.

[0010] The thermal storage unit includes a hot water storage tank, a hot water pump, a cold water storage tank, and a cold water pump. The thermal storage unit is used for cooling and heating the heat exchange unit.

[0011] The gas storage unit includes a gas storage tank, a gas storage tank inlet regulating valve, and a gas storage tank outlet regulating valve. The gas storage unit is used to store compressed air.

[0012] The reused generator set includes a reused motor, a clutch, a first switch and a second switch, and is used for switching the power plant's operating mode.

[0013] The air turbine is connected to the multiplex motor via the clutch. The multiplex motor is connected to the external 220kV power grid via the first switch. The multiplex motor is connected to the external 10kV power grid via the second switch.

[0014] The power plant operates in the following modes: phase-regulation mode, energy storage and phase-regulation parallel mode, and power generation mode.

[0015] Furthermore, the compressor is connected to the electric motor, the compressor outlet is connected to the heat exchanger air inlet, the heat exchanger air outlet is connected to the gas storage tank inlet regulating valve, the gas storage tank inlet regulating valve is connected to the gas storage tank, the gas storage tank is connected to the gas storage tank outlet regulating valve, the gas storage tank outlet regulating valve is connected to the reheater air inlet, and the reheater air outlet is connected to the air turbine.

[0016] The outlet of the cold water storage tank is connected to the cold water pump, the outlet of the cold water pump is connected to the water-side inlet of the heat exchanger, and the water-side outlet of the heat exchanger is connected to the hot water storage tank; the outlet of the hot water storage tank is connected to the hot water pump, the outlet of the hot water pump is connected to the water-side inlet of the reheater, and the water-side outlet of the reheater is connected to the cold water storage tank.

[0017] Furthermore, the phase-shifting operating mode includes: in the phase-shifting operating mode, the compressor and air turbine are in a stopped state, the gas storage inlet regulating valve and the gas storage outlet regulating valve are both in a closed state, the clutch between the air turbine and the reuse motor is in a disengaged state, and the reuse motor operates in a phase-shifting state; the reuse motor draws power from the grid to drive the reuse motor to work, and controls the excitation magnitude to control the reactive power magnitude.

[0018] Furthermore, the parallel operation mode of energy storage and phase adjustment includes: in the energy storage plus phase adjustment operation mode, the air turbine is in a stopped state, the outlet regulating valve of the gas storage tank is closed, the compressor is in a running state, the inlet regulating valve of the gas storage tank is open, the clutch between the air turbine and the reuse motor is in a disengaged state, and the reuse motor is in a phase adjustment state.

[0019] Furthermore, the parallel operation mode of energy storage and phase regulation includes: the multiplexing motor draws power from the grid to drive the multiplexing motor to work, and controls the excitation magnitude to control the reactive power magnitude.

[0020] Furthermore, the power generation operating mode includes: in the power generation operating mode, the compressor is in a stopped state, the gas storage inlet regulating valve is closed, the air turbine is in a running state, the gas storage outlet regulating valve is open, the clutch between the air turbine and the reuse motor is in a coupled state, and the reuse motor is operating in a full-power power generation state.

[0021] Furthermore, the power generation mode includes: controlling the hot water flow rate by controlling the speed of the hot water pump, controlling the air flow rate by controlling the opening of the gas storage outlet regulating valve, and thus controlling the output of active power; and outputting a small reactive power by controlling the excitation magnitude of the excitation control system.

[0022] Furthermore, the method for switching from the phase-adjustment mode to the power generation mode includes: upon receiving a switching command, the operator opens the outlet regulating valve of the gas storage tank, allowing compressed air from the gas storage tank to flow into the air turbine. Driven by the compressed air, the air turbine's speed gradually increases to the rated speed. Simultaneously, the first circuit breaker remains closed, adjusting the reused motor to an unloaded state, and the clutch coupling connects it to the external 220kV power grid for grid connection. Subsequently, the active power output of the reused motor is gradually increased until the rated power generation is achieved.

[0023] Furthermore, the method for switching from the power generation mode to the phase-shifting mode includes: upon receiving a switching command, the operator gradually reduces the opening of the gas storage outlet regulating valve until it is closed; by reducing the opening of the gas storage outlet regulating valve, the amount of gas supplied to the air turbine from the gas storage is reduced, the air turbine speed gradually decreases, and the load on the reused motor decreases; the first circuit breaker between the external 220kV power grid and the reused motor is disconnected, and the clutch disengages; the second circuit breaker between the external 10kV power grid and the reused motor is closed, and the reused motor draws power from the external 10kV power grid to drive its operation; after the reused motor meets the conditions for reconnection to the external 220kV power grid, the second circuit breaker is disconnected, and the first circuit breaker is closed again, thus enabling the reused motor to be connected to the external 220kV power grid and enter the phase-shifting mode.

[0024] Furthermore, the method for switching from the power generation mode to the parallel operation mode of energy storage and phase regulation includes: upon receiving the switching command, the operator gradually reduces the opening of the gas storage outlet regulating valve until it closes. By reducing the opening of the gas storage outlet regulating valve, the amount of gas supplied to the air turbine in the gas storage is reduced, the air turbine speed gradually decreases, and the load on the reused motor decreases. The first circuit breaker between the external 220kV power grid and the reused motor is disconnected, and the clutch disengages. The second circuit breaker between the external 10kV power grid and the reused motor is closed, and the reused motor draws power from the external 10kV power grid to drive its operation. After the reused motor meets the conditions for reconnection to the external 220kV power grid, the second circuit breaker is disconnected, and the first circuit breaker is closed again, so that the reused motor is connected to the external 220kV power grid and operates in phase regulation mode. At the same time, the gas storage inlet regulating valve is opened, the compressor runs, and high-pressure air is injected into the gas storage.

[0025] Beneficial effects:

[0026] (1) The integrated regulating power station of the present invention realizes the integrated function of energy storage and phase regulation through system configuration optimization and transformation, and realizes the four-quadrant regulation of active and reactive power. While realizing the "peak shaving and valley filling" of electrical energy, it provides a large moment of rotational inertia and dynamic reactive power support, maintains the stability of the synchronous AC system, and effectively solves the contradiction between power imbalance and system imbalance in the new power system.

[0027] (2) The integrated regulating power station of the present invention can maintain a continuous 24-hour rotating operation, provide uninterrupted rotational inertia and voltage support in real time, and realize active mode switching as needed.

[0028] (3) The integrated regulating power station of the present invention provides three working conditions: power generation, phase regulation, energy storage and parallel phase regulation. It expands the traditional compressed air energy storage's only energy storage and power generation working conditions, realizes the uninterrupted use of the generator set for 24 hours, increases the frequency of use of the power station equipment, and improves the stability support capability of the power grid.

[0029] (4) The present invention provides a driving scheme for a multiplexed motor. Through the power-driven scheme, the multiplexed motor operates in a phase-shifting state and is driven by power from the grid. It can consume less reactive power and generate more reactive power.

[0030] (5) The integrated regulating power station disclosed in this invention greatly improves the running time of the reused motor, reduces the idle rate of the equipment, and avoids the problem of reduced equipment life caused by equipment start-up and shutdown. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the power generation operation of an integrated regulating power station based on compressed air energy storage technology according to the present invention;

[0033] Figure 2 This is a schematic diagram of the phase-regulating operation mode and the parallel operation mode of energy storage and phase regulation of an integrated regulating power station based on compressed air energy storage technology according to the present invention.

[0034] Figure 3 This is a schematic diagram of the operating conditions of an integrated regulating system based on compressed air energy storage power station according to the present invention.

[0035] Diagram description: Compressor-1, Heat exchanger-2, Reheater-3, Air turbine-4, Electric motor-5, Recycled motor-6, Hot water storage tank-7, Cold water storage tank-8, Gas storage tank-9, Gas storage tank inlet regulating valve-10, Gas storage tank outlet regulating valve-11, Hot water pump-12, Cold water pump-13, External 220kV power grid-14, Clutch-15, External 10kV power grid-16, Second switch-17, First switch-18. Detailed Implementation

[0036] To better understand the technical solution of the present invention, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0037] It should be understood that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0038] Example 1

[0039] like Figure 1 As shown, an integrated regulating power station based on compressed air energy storage technology includes: a compressor unit, an expander generator unit, a heat exchanger unit, a thermal storage unit, an air storage unit, and a reuse generator unit.

[0040] The compressor unit includes a compressor 1 and an electric motor 5, and the compressor unit is used for compressed air energy storage.

[0041] The expander generator set includes an air turbine 4, which is used to generate electricity through the air turbine 4.

[0042] The heat exchange unit includes a heat exchanger 2 and a reheater 3. The heat exchanger 2 is used to cool the compressed air, and the reheater 3 heats the compressed air for expansion and power generation.

[0043] The thermal storage unit includes a hot water storage tank 7, a hot water pump 12, a cold water storage tank 8, and a cold water pump 13. The thermal storage unit is used for cooling and heating the heat exchange unit.

[0044] The gas storage unit includes a gas storage tank 9, a gas storage tank inlet regulating valve 10, and a gas storage tank outlet regulating valve 11. The gas storage unit is used to store compressed air.

[0045] The reused generator set includes a reused motor 6, a clutch 15, a first power switch 18 and a second power switch 17. The reused generator set is used for switching the power station's operating mode.

[0046] The air turbine is connected to the multiplex motor 6 via the clutch 15. The multiplex motor 6 is connected to the external 220kV power grid 14 via the first switch 18. The multiplex motor 6 is connected to the external 10kV power grid 16 via the second switch 17.

[0047] The power plant operates in the following modes: phase-regulation mode, energy storage and phase-regulation parallel mode, and power generation mode.

[0048] Furthermore, the compressor 1 is connected to the motor 5, the outlet of the compressor 1 is connected to the air inlet of the heat exchanger 2, the air outlet of the heat exchanger 2 is connected to the inlet regulating valve 10 of the gas storage tank, the inlet regulating valve 10 of the gas storage tank is connected to the gas storage tank 9, the gas storage tank 9 is connected to the outlet regulating valve 11 of the gas storage tank, the outlet regulating valve 11 of the gas storage tank is connected to the air inlet of the reheater 3, and the air outlet of the reheater 3 is connected to the air turbine 4.

[0049] The outlet of the cold water storage tank 8 is connected to the cold water pump 13, the outlet of the cold water pump 13 is connected to the water-side inlet of the heat exchanger 2, and the water-side outlet of the heat exchanger 2 is connected to the hot water storage tank 7; the outlet of the hot water storage tank 7 is connected to the hot water pump 12, the outlet of the hot water pump 12 is connected to the water-side inlet of the reheater 3, and the water-side outlet of the reheater 3 is connected to the cold water storage tank 8.

[0050] Furthermore, the phase-shifting operating mode includes: in the phase-shifting operating mode, the compressor 1 and the air turbine 4 are in a stopped state, the gas storage inlet regulating valve 10 and the gas storage outlet regulating valve 11 are both in a closed state, the clutch 15 between the air turbine 4 and the multiplex motor 6 is in a disengaged state, and the multiplex motor 6 operates in a phase-shifting state; the multiplex motor 6 draws power from the grid to drive the multiplex motor 6 to work, and controls the excitation magnitude to control the reactive power magnitude.

[0051] Furthermore, the parallel operation mode of energy storage and phase adjustment includes: in the energy storage plus phase adjustment operation mode, the air turbine 4 is in a stopped state, the gas storage outlet regulating valve 11 is closed, the compressor 1 is in a running state, the gas storage inlet regulating valve 10 is open, the clutch 15 between the air turbine 4 and the reuse motor 6 is in a disengaged state, and the reuse motor 6 is in a phase adjustment state.

[0052] Furthermore, the parallel operation mode of energy storage and phase regulation includes: the multiplexing motor 6 draws power from the grid to drive the multiplexing motor 6 to work, and controls the excitation magnitude to control the reactive power magnitude.

[0053] Furthermore, the power generation mode includes: in the power generation mode, the compressor 1 is in a stopped state, the gas storage inlet regulating valve 10 is closed, the air turbine 4 is in a running state, the gas storage outlet regulating valve 11 is open, the clutch 15 between the air turbine 4 and the reuse motor 6 is in a coupled state, and the reuse motor 6 is operating at full power generation.

[0054] Furthermore, the power generation mode includes: controlling the hot water flow rate by controlling the speed of the hot water pump 12, controlling the air flow rate by controlling the opening of the gas storage outlet regulating valve 11, and thus controlling the output of active power; and outputting a small reactive power by controlling the excitation magnitude of the excitation control system.

[0055] Furthermore, the method for switching from the phase-adjustment mode to the power generation mode includes: upon receiving a switching command, the operator opens the outlet regulating valve 11 of the gas storage tank, allowing compressed air from the gas storage tank 9 to flow into the air turbine 4. Under the drive of the compressed air, the speed of the air turbine 4 gradually increases to the rated speed. Simultaneously, the first circuit breaker 18 remains closed, adjusting the reuse motor 6 to an unloaded state, and the clutch 15 couples with the external 220kV power grid to achieve grid connection. Subsequently, the active power output of the reuse motor 6 is gradually increased until the rated power generation is achieved.

[0056] Furthermore, the method for switching from the power generation mode to the phase-shifting mode includes: upon receiving a switching command, the operator gradually reduces the opening of the gas storage outlet regulating valve 11 until it is closed; by reducing the opening of the gas storage outlet regulating valve 11, the amount of gas supplied to the air turbine 4 from the gas storage 9 is reduced, the speed of the air turbine 4 gradually decreases, and the load on the reused motor 6 decreases; the first circuit breaker 18 between the external 220kV power grid 14 and the reused motor 6 is disconnected, and the clutch 15 is disengaged; the second circuit breaker 17 between the external 10kV power grid 16 and the reused motor 6 is closed, and the reused motor 6 draws power from the external 10kV power grid 16 to drive its operation; after the reused motor 6 meets the conditions for reconnection to the external 220kV power grid 14, the second circuit breaker 17 is disconnected, and the first circuit breaker 18 is closed, thereby connecting the reused motor 6 to the external 220kV power grid 14 and entering the phase-shifting mode.

[0057] Furthermore, the method for switching from the power generation mode to the parallel operation mode of energy storage and phase regulation includes: upon receiving the switching command, the operator gradually reduces the opening of the gas storage outlet regulating valve 11 until it closes; by reducing the opening of the gas storage outlet regulating valve 11, the amount of gas supplied to the air turbine 4 from the gas storage 9 is reduced, the speed of the air turbine 4 gradually decreases, and the load on the reused motor 6 decreases; the first circuit breaker 18 between the external 220kV power grid 14 and the reused motor 6 is disconnected, and the clutch 15 is disengaged; The second switch 17 between the 10kV power grid 16 and the reused motor 6 is closed, and the reused motor 6 draws power from the external 10kV power grid 16 to drive the reused motor 6 to work; after the reused motor 6 meets the conditions for reconnection to the external 220kV power grid 14, the second switch 17 is opened, and the first switch 18 is closed, so that the reused motor 6 is connected to the external 220kV power grid and operates in phase-changing mode; at the same time, the gas storage inlet regulating valve 10 is opened, the compressor 1 runs, and high-pressure air is injected into the gas storage 9.

[0058] Example 2

[0059] An integrated regulating power station based on compressed air energy storage technology, the integrated regulating power station comprising a compressor unit, an expansion generator unit, a heat exchanger unit, a thermal storage unit, an air storage unit, and a reuse generator unit.

[0060] The compressor unit includes a compressor 1 and an electric motor 5.

[0061] The expansion generator set includes an air turbine 4, a clutch 15, a multiplex motor 6, a first switch 18, and a second switch 17.

[0062] The heat exchange unit includes a heat exchanger 2 and a reheater 3.

[0063] The thermal storage unit includes a hot water storage tank 7, a hot water pump 12, a cold water storage tank 8, and a cold water pump 13.

[0064] The gas storage unit includes a gas storage tank 9, a gas storage tank inlet regulating valve 10, and a gas storage tank outlet regulating valve 11.

[0065] The integrated regulating power station includes a compressed air flow line and a demineralized water medium flow line.

[0066] The reused generator set includes a reused motor 6, a clutch 15, a first power switch 18, and a second power switch 17. The reused generator set is used for switching the power station's operating mode.

[0067] The air turbine is connected to the multiplex motor 6 via the clutch 15. The multiplex motor 6 is connected to the external 220kV power grid 14 via the first switch 18. The multiplex motor 6 is connected to the external 10kV power grid 16 via the second switch 17.

[0068] like Figure 1 , 2 As shown, the airflow circuit connection is as follows: the compressor 1 is connected to the motor 5; the outlet of the compressor 1 is connected to the air inlet of the heat exchanger 2; the air outlet of the heat exchanger 2 is connected to the inlet regulating valve 10 of the gas storage tank; the inlet regulating valve 10 of the gas storage tank is connected to the gas storage tank 9; the gas storage tank 9 is connected to the outlet regulating valve 11 of the gas storage tank; the outlet regulating valve 11 of the gas storage tank is connected to the air inlet of the reheater 3; the air outlet of the reheater 3 is connected to the air turbine 4; the air turbine 4 is connected to the reuse motor 6 via a clutch 15; the reuse motor 6 is connected to the external 220kV power grid 14 via a first switch 18; and the reuse motor 6 is connected to the external 10kV power grid 16 via a second switch 17.

[0069] The water medium flow path is connected as follows: the cold water storage tank 8 is pipe-connected to the cold water pump 13, the cold water pump 13 is connected to the water-side inlet of the heat exchanger 2, and the water-side outlet of the heat exchanger 2 is connected to the hot water storage tank 7. The hot water storage tank 7 is connected to the hot water pump 12, the hot water pump 12 is connected to the water-side inlet of the reheater 3, and the water-side outlet of the reheater 3 is connected to the cold water storage tank 8.

[0070] like Figure 3 The diagram shows an integrated regulating power plant operation method based on compressed air energy storage technology. The system operation method includes phase regulation mode, parallel operation of energy storage and phase regulation, and power generation mode.

[0071] like Figure 2 and Figure 3As shown, in the phase-shifting operation, compressor 1 is stopped, air turbine 4 is also stopped, the gas storage inlet regulating valve 10 and the gas storage outlet regulating valve 11 are both closed, the clutch 15 between air turbine 4 and multiplex motor 6 is disengaged, and multiplex motor 6 operates in phase-shifting mode. Power is drawn from the external 220kV power grid 14 to drive multiplex motor 6. The external 220kV power grid 14 consumes relatively small active power and outputs relatively large reactive power. The reactive power is generated through the excitation control system, which controls the excitation magnitude and thus the reactive power magnitude.

[0072] like Figure 2 and Figure 3 As shown, in the parallel operation of energy storage and phase regulation, the air turbine 4 is in a stopped state, and the gas storage outlet regulating valve 11 is closed. The compressor 1 is in a running state, and the gas storage inlet regulating valve 10 is open. The clutch 15 between the air turbine 4 and the multiplex motor 6 is disengaged, and the multiplex motor 6 operates in phase regulation mode. It draws power from the external 220kV power grid 14 to drive the multiplex motor 6, consuming relatively small active power and outputting relatively large reactive power through the power grid. The reactive power is generated through the excitation control system, which controls the excitation magnitude and thus the reactive power magnitude.

[0073] like Figure 1 and Figure 3 As shown, in the power generation mode, compressor 1 is stopped, gas storage inlet regulating valve 10 is closed, air turbine 4 is running, gas storage outlet regulating valve 11 is open, clutch 15 between air turbine 4 and multiplex motor 6 is coupled, and multiplex motor 6 is operating in power generation mode, generating electricity at full power. The hot water flow and air flow are controlled by adjusting the speed of hot water pump 12 and the opening degree of gas storage outlet regulating valve 11, thereby controlling the active power output. Simultaneously, a smaller reactive power output is generated by adjusting the excitation level of the excitation control system.

[0074] A method for switching between different modes in an integrated regulating power station based on compressed air energy storage technology:

[0075] The method for switching from phase modulation mode to power generation mode involves the operator receiving a switching command and opening the outlet regulating valve 11 of the gas storage tank 9. High-pressure air from the gas storage tank 9 is injected into the air turbine 4, which, driven by the air, increases its speed to the rated speed. Simultaneously, the first circuit breaker 18 between the external 220kV power grid 14 and the reused motor 6 remains closed, modulating the reused motor 6 into an unloaded state. The clutch 15 couples with the external 220kV power grid 14 to achieve grid connection. Subsequently, the active power output of the reused motor 6 is gradually increased according to system scheduling needs until the rated power generation is achieved.

[0076] The method for switching from power generation mode to phase modulation mode involves the operator receiving a switching command and adjusting the opening of the gas storage outlet regulating valve 11 until it closes. Adjusting the opening of the gas storage outlet regulating valve 11 adjusts the amount of gas supplied to the air turbine from the gas storage 9, gradually reducing the speed of the air turbine 4 and decreasing the load on the reused motor 6. The first circuit breaker 18 between the external 220kV power grid 14 and the reused motor 6 is disconnected, and the clutch 15 disengages. The second circuit breaker 17 between the external 10kV power grid 16 and the reused motor 6 is closed, allowing the reused motor 6 to draw power from the external 10kV power grid 16 and operate. Once the reused motor 6 meets the conditions for reconnection to the external 220kV power grid 14, the second circuit breaker 17 is sequentially opened and the first circuit breaker 18 is closed, allowing the reused motor 6 to connect to the external 220kV power grid 14 and operate in phase modulation mode.

[0077] The method for switching from power generation mode to parallel energy storage and phase regulation mode involves the operator receiving a switching command and adjusting the opening of the gas storage outlet regulating valve 11 until it closes. By adjusting the opening of the gas storage outlet regulating valve 11, the amount of gas supplied to the air turbine from the gas storage 9 is adjusted, gradually reducing the speed of the air turbine 4 and decreasing the load on the reused motor 6. The first circuit breaker 18 between the external 220kV power grid 14 and the reused motor 6 is disconnected, and the clutch 15 is disengaged. The second circuit breaker 17 between the external 10kV power grid 16 and the reused motor 6 is closed, allowing the reused motor 6 to draw power from the external 10kV power grid 16 and operate. Once the reused motor 6 meets the conditions for reconnection to the external 220kV power grid 14, the second circuit breaker 17 is opened and the first circuit breaker 18 is closed sequentially, enabling the reused motor 6 to connect to the external 220kV power grid 14 and operate in phase regulation mode. At the same time, valve 10 at the gas storage inlet is opened, compressor 2 runs, and high-pressure air is continuously injected into gas storage 9.

[0078] The embodiments of the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. An integrated regulating power station based on compressed air energy storage technology, characterized in that, The power station includes: a compressor unit, an expansion generator unit, a heat exchanger unit, a thermal storage unit, a gas storage unit, and a reuse generator unit; The compressor unit includes a compressor and an electric motor, and the compressor unit is used for compressed air energy storage. The expander generator set includes an air turbine, and the expander generator set is used to generate electricity through the air turbine; The heat exchange unit includes a heat exchanger and a reheater. The heat exchanger is used to cool the compressed air, and the reheater heats the compressed air for expansion and power generation. The thermal storage unit includes a hot water storage tank, a hot water pump, a cold water storage tank, and a cold water pump. The thermal storage unit is used for cooling and heating the heat exchange unit. The gas storage unit includes a gas storage tank, a gas storage tank inlet regulating valve, and a gas storage tank outlet regulating valve. The gas storage unit is used to store compressed air. The reused generator set includes a reused motor, a clutch, a first switch and a second switch, and is used for switching the power plant's operating mode. The air turbine is connected to the multiplex motor via the clutch. The multiplex motor is connected to the external 220kV power grid via the first switch. The multiplex motor is connected to the external 10kV power grid via the second switch. The power plant operation modes include: phase-regulation mode, energy storage and phase-regulation parallel mode, and power generation mode; The compressor is connected to the electric motor, the compressor outlet is connected to the heat exchanger air inlet, the heat exchanger air outlet is connected to the gas storage tank inlet regulating valve, the gas storage tank inlet regulating valve is connected to the gas storage tank, the gas storage tank is connected to the gas storage tank outlet regulating valve, the gas storage tank outlet regulating valve is connected to the reheater air inlet, and the reheater air outlet is connected to the air turbine. The outlet of the cold water storage tank is connected to the cold water pump, the outlet of the cold water pump is connected to the water-side inlet of the heat exchanger, and the water-side outlet of the heat exchanger is connected to the hot water storage tank; the outlet of the hot water storage tank is connected to the hot water pump, the outlet of the hot water pump is connected to the water-side inlet of the reheater, and the water-side outlet of the reheater is connected to the cold water storage tank. The method for switching from the power generation mode to the parallel operation mode of energy storage and phase regulation includes: upon receiving the switching command, the operator gradually reduces the opening of the gas storage outlet regulating valve until it closes. By reducing the opening of the gas storage outlet regulating valve, the amount of gas supplied to the air turbine in the gas storage is reduced, the air turbine speed gradually decreases, and the load on the reused motor decreases. The first circuit breaker between the external 220kV power grid and the reused motor is disconnected, and the clutch disengages. The second circuit breaker between the external 10kV power grid and the reused motor is closed, and the reused motor draws power from the external 10kV power grid to drive its operation. After the reused motor meets the conditions for reconnection to the external 220kV power grid, the second circuit breaker is disconnected, and the first circuit breaker is closed, so that the reused motor is connected to the external 220kV power grid and operates in phase regulation mode. At the same time, the gas storage inlet regulating valve is opened, the compressor runs, and high-pressure air is injected into the gas storage.

2. The integrated regulating power station according to claim 1, characterized in that, The phase-shifting operating mode includes: in the phase-shifting operating mode, the compressor and air turbine are in a stopped state, the gas storage inlet regulating valve and the gas storage outlet regulating valve are both in a closed state, the clutch between the air turbine and the reuse motor is in a disengaged state, and the reuse motor operates in a phase-shifting state; the reuse motor is driven to work by drawing power from the grid, and the excitation magnitude is controlled to control the reactive power magnitude.

3. The integrated regulating power station according to claim 1, characterized in that, The parallel operation mode of energy storage and phase adjustment includes: in the energy storage plus phase adjustment operation mode, the air turbine is in a stopped state, the outlet regulating valve of the gas storage tank is closed, the compressor is in a running state, the inlet regulating valve of the gas storage tank is open, the clutch between the air turbine and the reuse motor is in a disengaged state, and the reuse motor is in a phase adjustment state.

4. The integrated regulating power station according to claim 3, characterized in that, The parallel operation mode of energy storage and phase regulation includes: the reused motor draws power from the grid to drive the reused motor to work, and controls the excitation magnitude to control the reactive power magnitude.

5. The integrated regulating power station according to claim 1, characterized in that, The power generation operating mode includes the following: in the power generation operating mode, the compressor is in a stopped state, the gas storage inlet regulating valve is closed, the air turbine is in a running state, the gas storage outlet regulating valve is open, the clutch between the air turbine and the reuse motor is in a coupled state, and the reuse motor is operating in a full-power power generation state.

6. The integrated regulating power station according to claim 5, characterized in that, The power generation mode includes: controlling the hot water flow rate by controlling the speed of the hot water pump, controlling the air flow rate by controlling the opening of the gas storage outlet regulating valve, and thus controlling the output of active power; and outputting a small amount of reactive power by controlling the excitation magnitude of the excitation control system.

7. The integrated regulating power station according to claim 1, characterized in that, The method for switching from the phase-shifting mode to the power generation mode includes: upon receiving a switching command, the operator opens the outlet regulating valve of the gas storage tank, allowing compressed air to flow into the air turbine. Driven by the compressed air, the air turbine gradually increases its speed to the rated speed. Simultaneously, the first circuit breaker remains closed, adjusting the reused motor to an unloaded state, and the clutch coupling connects it to the external 220kV power grid for grid connection. Subsequently, the active power output of the reused motor is gradually increased until the rated power generation is achieved.

8. The integrated regulating power station according to claim 1, characterized in that, The method for switching from the power generation mode to the phase-shifting mode includes: upon receiving the switching command, the operator gradually reduces the opening of the gas storage outlet regulating valve until it is closed; by reducing the opening of the gas storage outlet regulating valve, the amount of gas supplied to the air turbine from the gas storage is reduced, the air turbine speed gradually decreases, and the load on the reused motor decreases; the first circuit breaker between the external 220kV power grid and the reused motor is disconnected, and the clutch disengages; the second circuit breaker between the external 10kV power grid and the reused motor is closed, and the reused motor draws power from the external 10kV power grid to drive its operation; after the reused motor meets the conditions for reconnection to the external 220kV power grid, the second circuit breaker is disconnected, and the first circuit breaker is closed again, thus connecting the reused motor to the external 220kV power grid and entering the phase-shifting mode.

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