Water pumping and air compressing energy storage device

Abstract

The invention relates to a water pumping and air compressing energy storage device, and belongs to the technical field of energy storage. The water pumping and air compressing energy storage device comprises a water pumping generator set, a water storage system and an elastic energy storage bag. The water pumping generator set is used for pumping water or generating electricity through water. The water storage system is provided with a water inlet and a water outlet, the water inlet and the water outlet are both communicated with the water pumping generator set, and the pressure of the water storage system is larger than the pressure needed by the water pumping generator set. The plurality of elastic energy storage bags are arranged on the water storage system, when the water pumping generator set pumps water, the elastic energy storage bags expand to store energy, and when the water pumping generator set generates power, the elastic energy storage bags elastically recover to release energy so as to provide pressure to push water to the water pumping generator set during power generation. Therefore, according to the water pumping and air compressing energy storage device, high-pressure air and water are stored through the multiple elastic energy storage bags, different electric power requirements can be met more flexibly by using different numbers of elastic energy storage bags, and adaptability is better.

Description

Technical Field

[0001] The invention belongs to the technical field of energy storage, and in particular relates to a water-pumped compressed air energy storage device. Background Art

[0002] Pumped storage is a type of energy storage technology that uses water as an energy carrier and achieves energy storage and utilization through the process of pumping and releasing water. Traditional pumped storage power stations are generally composed of an upper reservoir, a water transmission system, a plant, and a lower reservoir. Its working principle is to use excess electricity in the power grid to pump water from the lower reservoir to the upper reservoir during periods of low power load, and convert the electrical energy into the gravitational potential energy of water for storage; during peak power consumption periods, the stored gravitational potential energy is released to drive the turbine to generate electricity, and then the gravitational potential energy is converted into electrical energy. This technology can effectively regulate the supply and demand of the power system, achieve dynamic balance, and improve the operational safety and power supply quality of the power grid.

[0003] However, existing energy storage systems that use high-pressure gas to move water are usually designed as a single high-pressure gas storage tank. This fixed configuration makes the system lack adaptability when facing fluctuations in electricity demand or changes in long-term energy storage needs. Summary of the invention

[0004] The present invention provides a water-pumping compressed gas energy storage device, which is used to solve the technical problem that the current use of a single high-pressure gas storage tank lacks adaptability when facing fluctuations in electricity demand or changes in long-term energy storage demand.

[0005] The present invention is implemented through the following technical solutions: a pumping compressed air energy storage device, comprising: a pumping generator set, a water storage system and an elastic energy storage capsule, wherein the pumping generator set is used for pumping water or generating electricity using water; the water storage system has a water inlet and a water outlet, the water inlet and the water outlet are both connected to the pumping generator set, when the pumping generator set pumps water, the water storage system is used to store the water pumped by the pumping generator set; when the pumping generator set generates electricity, the water storage system is used to provide water for the pumping generator set to generate electricity, and the pressure of the water storage system is greater than the pressure required by the pumping generator set; a plurality of elastic energy storage capsules are provided, and a plurality of elastic energy storage capsules are arranged on the water storage system, when the pumping generator set pumps water, the elastic energy storage capsules expand to store energy, and when the pumping generator set generates electricity, the elastic energy storage capsules elastically recover and release energy, so as to provide pressure to push water to the pumping generator set during power generation.

[0006] Optionally, it also includes an air supply system, which is connected to the water storage system through an air supply pipe, and the air supply system is used to provide pressure for the air supply to the water storage system.

[0007] Optionally, it also includes a branch pipe, one end of which is connected to the air supply system, and the other end is connected to an end of the water storage system close to the water outlet, and the end of the air supply pipe away from the air supply system is connected between the water inlet and the water outlet.

[0008] Optionally, it also includes a water storage pipeline, one end of which is connected to the pumping generator set to store water after the pumping generator set generates electricity, and the other end of the water storage pipeline is connected to a water source.

[0009] Optionally, the water storage system includes a first water storage container and a second water storage container, the water inlet is arranged in the first water storage container, and the water inlet is connected to the water pumping generator set; the second water storage container is connected to the first water storage container, the water outlet is arranged in the second water storage container, and the water outlet is communicated with the water pumping generator set.

[0010] Optionally, the gas supply system includes a gas tank and an air compressor, the gas tank is used to store high-pressure gas, the gas supply pipe and the branch pipe are both connected to the gas tank; the air compressor is connected to the gas tank to fill the gas tank with gas.

[0011] Optionally, the water inlet is provided with a first valve, a second valve is provided between the first water storage container and the second water storage container, the water outlet is provided with a third valve, the air supply pipe is provided with a fourth valve, and fifth and sixth valves are provided at both ends of the branch pipe.

[0012] Optionally, a seventh valve and an eighth valve are respectively provided at both ends of the water storage pipeline.

[0013] Optionally, when the grid load is low, excess electricity is used to drive the pumping generator set to pump water to the water storage system for storage; when the grid load is peak, the elastic energy storage bag elastically recovers and releases energy to push the water in the water storage system to the pumping generator set to generate electricity for the grid.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] A water-pumping compressed air energy storage device provided by the present invention comprises a water-pumping generator set, a water storage system and an elastic energy storage capsule. The water-pumping generator set is used for pumping water or generating electricity using water. The water storage system has a water inlet and a water outlet, both of which are connected to the water-pumping generator set. When the water-pumping generator set pumps water, the water storage system is used to store the water pumped by the water-pumping generator set. When the water-pumping generator set generates electricity, the water storage system is used to provide water for the water-pumping generator set to generate electricity, and the pressure of the water storage system is greater than the pressure required by the water-pumping generator set. A plurality of elastic energy storage capsules are provided, and the plurality of elastic energy storage capsules are arranged on the water storage system. When the water-pumping generator set pumps water, the elastic energy storage capsules expand to store energy. When the water-pumping generator set generates electricity, the elastic energy storage capsules elastically recover and release energy, so as to provide pressure to push water to the water-pumping generator set during power generation.

[0016] Through the above structure, when the pumping and compressed air energy storage device provided by the present invention is storing energy, the pumping generator set pumps water into the water storage system for storage, and at the same time, multiple elastic energy storage capsules expand to store energy. When the pumping generator set generates electricity, the elastic energy storage capsules elastically recover and release energy to provide pressure to push water to the pumping generator set for power generation. Therefore, the pumping and compressed air energy storage device stores high-pressure gas and water through multiple elastic energy storage capsules. By using different numbers of elastic energy storage capsules, it can more flexibly adapt to different power needs and has better adaptability. At the same time, the use of multiple energy storage capsules can also improve the reliability of the energy storage device and ensure the stability of power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1-3 It is a structural schematic diagram of a water-pumping and air-compressing energy storage device provided by the present invention.

[0019] In the figure:

[0020] 1- pumping generator set; 2- water storage system; 21- first water storage container; 22- second water storage container; 3- elastic energy storage bag; 4- air supply system; 41- air storage tank; 42- air compressor; 5- air supply pipe; 6- branch pipe; 7- water storage pipeline; 8- first valve; 9- second valve; 10- third valve; 11- fourth valve; 12- fifth valve; 13- sixth valve; 14- seventh valve; 15- eighth valve; 16- ninth valve. DETAILED DESCRIPTION

[0021] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply 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 a limitation on the present application.

[0022] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0023] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0024] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0025] Example

[0026] The present invention provides a pumping compressed air energy storage device to solve the technical problem that the current use of a single high-pressure gas storage tank lacks adaptability when facing fluctuations in power demand or changes in long-term energy storage demand. The pumping compressed air energy storage device includes a pumping generator set 1, a water storage system 2, and an elastic energy storage capsule 3, wherein:

[0027] The pumping generator set 1 is used for pumping water or generating electricity using water. The pumping generator set 1 includes two working states: pumping water and generating electricity. When pumping water, the pumping generator set 1 consumes electric energy to pump water from a low-level water source to a high-level water storage tank. The unit consumes electric energy and converts the electric energy into the gravitational potential energy of water. When generating electricity, the unit uses the gravitational potential energy of water to drive the pumping generator set 1 and converts the water flow into electric energy output. The pumping generator set 1 realizes the regulation of the grid load through the conversion of the two processes of pumping energy storage and power generation.

[0028] The water storage system 2 has a water inlet and a water outlet, such as Figure 1 As shown, the water inlet and the water outlet of the water storage system 2 are both connected to the water storage system 2. Specifically, when the pumping generator set 1 is pumping water, the pumping generator set 1 pumps water into the water storage system 2 through the water inlet for storage. When the pumping generator set 1 is generating electricity, the water storage system 2 transports the stored water to the pumping generator set 1 through the water outlet. The pumping generator set 1 generates electricity using the water provided by the water storage system 2. The water pressure of the water storage system 2 is greater than the pressure required for the pumping generator set 1 to generate electricity. Specifically, the pumping generator set 1 can pump water from a low place to a high place for storage, and convert electrical energy into potential energy of water. When the pumping generator set 1 is generating electricity, the water in the water storage system 2 is released, and the water flow drives the turbine of the pumping generator set 1 to rotate and generate electricity, converting the potential energy of water into electrical energy for supply to the power grid. The pressure in the water storage system 2 can also be increased by injecting air, so that the pumping generator set 1 generates electricity using the water in the water storage system 2.

[0029] There are a plurality of elastic energy storage capsules 3, such as Figure 1As shown, multiple elastic energy storage capsules 3 are arranged on the water storage system 2. When the pumping generator set 1 pumps water, the elastic energy storage capsules 3 expand to store energy. When the pumping generator set 1 generates electricity, the elastic energy storage capsules 3 elastically recover and release the stored energy. Its elastic recovery force pushes the water to flow to the pumping generator set 1, providing additional pressure for the power generation process, which can not only improve the stability and continuity of the water flow, but also improve the output power and efficiency of the generator. The elastic recovery force of the elastic energy storage capsules 3 can balance and adjust the pressure fluctuation of the water flow, so that the pumping generator set 1 is more stable during the power generation process. The elastic energy storage capsules 3 can not only store more water, but also improve the water storage system by filling more air. 2, the gas or liquid in the elastic energy storage capsule 3 is compressed to form a certain energy storage state. Through multiple elastic energy storage capsules 3, by using different numbers of elastic energy storage capsules 3, different power demands can be more flexibly adapted. Specifically, when the power demand is large, more elastic energy storage capsules 3 can be used to increase the storage capacity of water and increase the pressure in the water storage system 2. At the same time, the elastic energy storage capsule 3 can provide greater pressure and reduce the dependence on geographical conditions. The use of multiple elastic energy storage capsules 3 can also improve the safety and reliability of the energy storage device. When a single elastic energy storage capsule 3 fails or is damaged, other elastic energy storage capsules 3 can still continue to work to ensure the stability of power supply.

[0030] Through the above structure, when the pumping and compressed air energy storage device provided by the present invention is storing energy, the pumping generator set 1 pumps water into the water storage system 2 for storage, and at the same time, multiple elastic energy storage capsules 3 expand to store energy. When the pumping generator set 1 generates electricity, the elastic energy storage capsules 3 elastically recover and release energy to provide pressure to push water to the pumping generator set 1 for power generation. Therefore, the pumping and compressed air energy storage device stores high-pressure gas and water through multiple elastic energy storage capsules 3. By using different numbers of elastic energy storage capsules 3, it can more flexibly adapt to different power needs and has better adaptability. At the same time, the use of multiple energy storage capsules can also improve the reliability of the energy storage device and ensure the stability of power supply.

[0031] An optional implementation of this embodiment is as follows: In order for the water storage system 2 to be able to more stably supply water to the pumping generator set 1, the pumping compressed air energy storage device also includes an air supply system 4, such as Figure 2As shown, the air supply system 4 is connected to the water storage system 2 through the air supply pipe 5. The air supply system 4 is used to provide pressure for the water storage system 2. The air supply system 4 fills the water storage system 2 with gas through the air supply pipe 5. During the inflation process, the water storage system 2 is in a sealed state to prevent gas leakage and water overflow. At this time, the high-pressure gas in the water storage system 2 and the elastic energy storage bag 3 act together on the water flow to provide it with stable pressure. The air supply system 4 enables the water storage system 2 to always maintain a stable pressure state, thereby ensuring that the pumping generator set 1 can obtain a stable water supply during the pumping and power generation process, thereby improving the stability of the pumped energy storage device.

[0032] An optional implementation of the present embodiment is as follows: In order to improve the air supply effect of the air supply system 4, the water pumping compressed air energy storage device also includes a branch pipe 6, one end of the branch pipe 6 is connected to the air supply system 4, and the other end is connected to an end of the water storage system 2 close to the water outlet, and the end of the air supply pipe 5 away from the air supply system 4 is connected between the water inlet and the water outlet. The branch pipe 6 can directly transport the high-pressure gas provided by the air supply system 4 to the water storage system 2. The branch pipe 6 and the air supply pipe 5 work together to increase the pressure in the water storage system 2 faster and more evenly, thereby ensuring that the pumping generator set 1 can obtain a stable water flow supply.

[0033] An optional implementation of this embodiment is as follows: it also includes a water storage pipeline 7, such as Figure 3 As shown, one end of the water storage pipe 7 is connected to the water outlet of the pumping generator set 1 for receiving water after power generation, and the other end is connected to the water source so as to replenish fresh water in time. During the pumping process, the pumping generator set 1 draws water from the water source and transports it to the water storage system 2 for storage. At the same time, part of the water will also flow into the water storage pipe 7 for subsequent use. During the power generation process, the water in the water storage system 2 flows into the pumping generator set 1 through the water outlet. After driving the generator to generate electricity, the water flows into the water storage pipe 7 again to form a cycle. When the amount of water in the water storage pipe 7 is insufficient, fresh water can be replenished from the water source. At the same time, in order to maintain the water quality and the cleanliness of the system, part of the water in the water storage pipe 7 can be regularly discharged to the water source. During the discharge process, it is necessary to ensure that the discharged water meets environmental protection standards to avoid pollution to the environment.

[0034] An optional implementation of this embodiment is as follows: the water storage system 2 includes a first water storage container 21 and a second water storage container 22, a water inlet is arranged on the first water storage container 21, the water inlet is connected to the pumping generator set 1, the second water storage container 22 is connected to the first water storage container 21, and a water outlet is arranged on the second water storage container 22, the water outlet is connected to the pumping generator set 1, when the pumping generator set 1 pumps water, firstly, water enters the first water storage container 21 from the water inlet through the pumping generator set 1, and then the water continues to flow to the second water storage container 22, when the pumping generator set 1 generates electricity, the water in the second water storage container 22 first generates electricity through the water outlet through the pumping generator set 1, and as the pumping generator set 1 During power generation, water in the first water storage container 21 gradually flows to the second water storage container 22, and finally flows to the pumping generator set 1 through the water outlet. One end of the air supply pipe 5 away from the air supply system 4 is connected between the first water storage container 21 and the second water storage container 22, and one end of the branch pipe 6 away from the air supply system 4 is connected to the second water storage container 22. The first water storage container 21 and the second water storage container 22 can be water tanks, or water pipes, water tanks or other containers capable of storing water. The first water storage container 21 and the second water storage container 22 are both provided with a plurality of elastic energy storage bags 3. It is worth noting that the first water storage container 21 and the second water storage container 22 need to remain sealed when the air supply system 4 increases the pressure.

[0035] An optional implementation of the present embodiment is as follows: the gas supply system 4 includes a gas tank 41 and an air compressor 42, the gas tank 41 is used to store high-pressure gas, the gas supply pipe 5 and the branch pipe 6 are connected to the gas tank 41, after the pumping generator set 1 completes pumping, the high-pressure gas in the gas tank 41 is filled into the water storage system 2 through the gas supply pipe 5 and the branch pipe 6, the air compressor 42 is connected to the gas tank 41, the air compressor 42 is used to replenish the high-pressure gas into the gas tank 41, a ninth valve 16 is provided between the gas tank 41 and the air compressor 42, the ninth valve 16 is used to control the process of the air compressor 42 replenishing the gas into the gas tank 41, when the air compressor 42 has finished replenishing the gas into the gas tank 41, the ninth valve 16 is opened to allow the gas to smoothly enter the gas tank 41, after the inflation is completed, the ninth valve 16 is closed to prevent gas leakage and waste.

[0036] An optional implementation of the present embodiment is as follows: a first valve 8 is provided at the water inlet, a second valve 9 is provided between the first water storage container 21 and the second water storage container 22, a third valve 10 is provided at the water outlet, a fourth valve 11 is provided at the air supply pipe 5, and a fifth valve 12 and a sixth valve 13 are provided at both ends of the branch pipe 6. When the pumping generator set 1 pumps water, the first valve 8 and the second valve 9 are opened, and the third valve 10, the fourth valve 11, the fifth valve 12 and the sixth valve 13 are all closed to store water in the water storage system 2 through the first valve 8. After the pumping is completed, the first valve 8 and the third valve 10 are closed to seal the water storage system 2. At the same time, the fourth valve 11, the fifth valve 12 and the sixth valve 13 are opened to charge high-pressure gas into the water storage system 2 through the gas tank 41 to increase the pressure in the water storage system 2. After the gas is charged, the fourth valve 11, the fifth valve 12 and the sixth valve 13 are closed. When the water in the water storage system 2 is used to generate electricity, the third valve 10 is opened to discharge the water in the water storage system 2.

[0037] An optional implementation of this embodiment is as follows: a seventh valve 14 and an eighth valve 15 are respectively provided at both ends of the water storage pipeline 7, the seventh valve 14 is located at one end of the water storage pipeline 7 close to the pumping generator set 1, and the eighth valve 15 is located at one end of the water storage pipeline 7 close to the water source. When it is necessary to add water to the water storage pipeline 7, the seventh valve 14 and the eighth valve 15 are opened, and the pumping generator set 1 pumps water from the water source through the water storage pipeline 7 to the water storage system 2. When the pumping generator set 1 generates electricity, the seventh valve 14 can be opened and the eighth valve 15 can be closed to store water in the water storage pipeline 7, and the water can be recycled or discharged to the water source.

[0038] An optional implementation of this embodiment is as follows: when the grid load is low, the excess electricity is used to drive the pumping generator set 1 to pump water to the water storage system 2 for storage; when the grid load is peak, the elastic energy storage capsule 3 elastically recovers and releases energy to push the water in the water storage system 2 to the pumping generator set 1 to generate electricity for the grid.

[0039] In summary, when the water-pumping compressed air energy storage device is storing energy, the first valve 8, the second valve 9, the seventh valve 14 and the eighth valve 15 are opened, the water-pumping generator set 1 draws water from the water source, the water enters the first water storage container 21 from the water inlet through the water-pumping generator set 1, and then the water continues to flow to the second water storage container 22, the ninth valve 16 is opened, and the air compressor 42 replenishes the gas into the gas storage tank 41. After the inflation is completed, the ninth valve 16 is closed to prevent gas leakage and waste; after the water is pumped, the first valve 8 and the third valve 10 are closed to seal the water storage system 2, and at the same time the fourth valve 11, the fifth valve 12 and the eighth valve 15 are closed. The six valves 13 are opened, and the gas tank 41 fills the water storage system 2 with high-pressure gas through the gas supply pipe 5 and the branch pipe 6 to increase the pressure in the water storage system 2. At the same time, the multiple elastic energy storage capsules 3 expand and store energy; after the gas filling is completed, the fourth valve 11, the fifth valve 12 and the sixth valve 13 are closed; when the water in the water storage system 2 is used to generate electricity, the third valve 10 is opened, the seventh valve 14 is opened, and the eighth valve 15 is closed, and the elastic energy storage capsule 3 elastically recovers and releases energy to provide pressure to push the water to the pumping generator set 1 for power generation, and the water discharged from the water storage system 2 is stored in the water storage pipeline 7, and the water is recycled. Therefore, the pumping compressed gas energy storage device stores high-pressure gas and water through multiple elastic energy storage capsules 3. By using different numbers of elastic energy storage capsules 3, it can more flexibly adapt to different power needs and has better adaptability. At the same time, the use of multiple energy storage capsules can also improve the reliability of the energy storage device and ensure the stability of power supply.

[0040] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A pumped water compressed air energy storage device, characterized in that: include: Pumped-water generator sets are used to pump water or generate electricity using water; A water storage system having a water inlet and a water outlet, wherein the water inlet and the water outlet are both connected to the pumping generator set. When the pumping generator set is pumping water, the water storage system is used to store the water pumped by the pumping generator set. When the pumping generator set is generating electricity, the water storage system is used to provide water for the pumping generator set to generate electricity, and the pressure of the water storage system is greater than the pressure required by the pumping generator set. A plurality of elastic energy storage bags are arranged on the water storage system. When the pumping generator set pumps water, the elastic energy storage bags expand to store energy. When the pumping generator set generates electricity, the elastic energy storage bags elastically recover and release energy to provide pressure to push water to the pumping generator set during electricity generation.

2. A pumped water compressed air energy storage device according to claim 1, characterized in that: Also includes: An air supply system is connected to the water storage system through an air supply pipe, and the air supply system is used to provide pressure for the air supply to the water storage system.

3. A pumped water compressed air energy storage device according to claim 2, characterized in that: Also includes: A branch pipe has one end connected to the air supply system and the other end connected to an end of the water storage system close to the water outlet. An end of the air supply pipe away from the air supply system is connected between the water inlet and the water outlet.

4. A pumped water compressed air energy storage device according to claim 1, characterized in that: Also includes: A water storage pipeline has one end connected to the pumping generator set to store water after the pumping generator set generates electricity, and the other end of the water storage pipeline is connected to a water source.

5. The pumped water compressed air energy storage device according to claim 1, characterized in that: The water storage system comprises: A first water storage container, wherein the water inlet is provided in the first water storage container, and the water inlet is connected to the pumping generator set; The second water storage container is connected to the first water storage container, the water outlet is arranged in the second water storage container, and the water outlet is communicated with the pumping generator set.

6. A pumped water compressed air energy storage device according to claim 2, characterized in that: The gas supply system comprises: A gas storage tank, used to store high-pressure gas, the gas supply pipe and the branch pipe are both connected to the gas storage tank; An air compressor is connected to the gas storage tank and is used to fill the gas storage tank with gas.

7. The pumped water compressed air energy storage device according to claim 3, characterized in that: The water inlet is provided with a first valve, a second valve is provided between the first water storage container and the second water storage container, the water outlet is provided with a third valve, the air supply pipe is provided with a fourth valve, and both ends of the branch pipe are provided with a fifth valve and a sixth valve.

8. The pumped water compressed air energy storage device according to claim 4, characterized in that: A seventh valve and an eighth valve are respectively provided at both ends of the water storage pipeline.

9. The pumped water compressed air energy storage device according to claim 1, characterized in that: When the grid load is low, the excess electricity is used to drive the pumping generator set to pump water to the water storage system for storage; when the grid load is peak, the elastic energy storage bag elastically recovers and releases energy to push the water in the water storage system to the pumping generator set to generate electricity for the grid.

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