Verification device and method for variable-speed water pumping and compressed air hybrid energy storage test

Abstract

The invention relates to a variable-speed water pumping and compressed air hybrid energy storage test verification device and method, and belongs to the technical field of energy storage. Comprising a pool tank assembly, a common-capacity tank assembly, a pumped storage unit and a compressor which are sequentially connected, the pumped storage unit is a variable-speed pumped storage unit, and the compressor is a variable-frequency compressor. The test device provided by the invention is reasonable in design and low in cost, can be extremely flexibly operated in working conditions of pressure prefabrication, energy storage, power generation, enhanced heat exchange and near-constant water head operation, and can be used for comprehensively verifying key indexes so as to determine the feasibility of the test device.

Description

Technical Field

[0001] The invention relates to a water-pumping and air-compressing mixed energy storage verification device and method, belonging to the technical field of energy storage. Background Art

[0002] The continuous consumption of fossil energy has led to the increasing depletion of energy and environmental pollution, and has promoted the global demand for clean, efficient and renewable energy. In recent years, renewable energy such as wind, light, and tides have developed rapidly. However, wind power output is affected by wind speed, and photovoltaic output is affected by radiation intensity and temperature, which are intermittent and uncertain. Therefore, with the continuous development of wind and solar energy, the load regulation capacity of the power grid has been greatly challenged. In this context, energy storage equipment has received widespread attention for its ability to regulate twice the installed capacity. Among them, pumped storage technology and compressed air energy storage have been widely developed as large-scale and long-term energy storage technologies.

[0003] Based on the complementary thinking, researchers combined pumped storage and compressed air energy storage technologies and proposed a pumped-air hybrid energy storage technology. For example: the publication number is CN116429464A, and the name of the invention is a model test device and method for simulating pumped storage and compressed air energy storage systems. Its technical solution proposes a pumped-air hybrid energy storage system with separate water pumps and turbines; the publication number is CN117335455A, and the name of the invention is a variable-speed pumped-air hybrid energy storage device and its operation method. Its technical solution proposes a multi-stage variable-speed pumped-air hybrid energy storage system that can be developed on a large scale, and provides the operation of the energy storage and power generation process. However, the pumped-air hybrid energy storage technology is still in the theoretical research stage and has not yet been implemented in engineering demonstrations. Therefore, it is still necessary to build a test bench to verify the various safety performances of the pumped-air hybrid energy storage system and verify the technical feasibility to ensure personal and property safety and subsequent reliable operation.

[0004] Therefore, it is urgent to propose a variable speed pumping water compressed air hybrid energy storage test verification device and method to solve the above technical problems. Summary of the invention

[0005] In order to solve the above problems, a variable speed pumping water pressure gas hybrid energy storage test verification device and method are provided. A brief overview of the invention is given below to provide a basic understanding of certain aspects of the invention. It should be understood that this overview is not an exhaustive overview of the invention. It is not intended to identify the key or important parts of the invention, nor is it intended to limit the scope of the invention.

[0006] The technical solution of the present invention:

[0007] A variable speed pumped water compressed air hybrid energy storage test verification device comprises a water tank assembly, a common containment tank assembly, a pumped storage unit and a compressor. The water tank tank assembly, the pumped storage unit, the common containment tank assembly and the compressor are connected in sequence. The pumped storage unit is a variable speed pumped storage unit, and the compressor is a variable frequency compressor.

[0008] Preferably: the water tank assembly includes a first water tank, a second water tank, a ninth control valve and a tenth control valve, a lower opening of the first water tank is connected to one end of the ninth control valve, a lower opening of the second water tank is connected to one end of the tenth control valve, the other end of the ninth control valve is connected to the other end of the tenth control valve and then connected together to one end of the pumped storage unit.

[0009] Preferably: the common containment tank assembly includes a first water-gas common containment tank, a second water-gas common containment tank, a metal tube bundle, an eleventh control valve, a twelfth control valve, a fifteenth control valve and a sixteenth control valve, an upper opening of the first water-gas common containment tank is connected to one end of the fifteenth control valve, a metal tube bundle for heat exchange is arranged in the second water-gas common containment tank, an upper opening of the second water-gas common containment tank is connected to one end of the sixteenth control valve, the other end of the fifteenth control valve is connected to the other end of the sixteenth control valve and then connected to the compressor together, a lower opening of the first water-gas common containment tank is connected to one end of the eleventh control valve, a lower opening of the second water-gas common containment tank is connected to one end of the twelfth control valve, the other end of the eleventh control valve is connected to the other end of the twelfth control valve and then connected to the other end of the pumped-storage unit.

[0010] Preferably: it also includes a second electric valve and a third electric valve, the compressor is connected to the fifteenth control valve and the sixteenth control valve through the second electric valve, and the pumped storage unit is connected to the eleventh control valve and the twelfth control valve through the third electric valve.

[0011] Preferably: the water pool tank assembly further comprises a first control valve, a second control valve, a fifth control valve, a sixth control valve, a thirteenth control valve, a fourteenth control valve, a first safety valve and a second safety valve; another lower opening of the first water pool is connected to the first control valve, another lower opening of the second water pool is connected to the second control valve, the fifth control valve and the first safety valve are both connected to another upper opening of the first water pool, the sixth control valve and the second safety valve are both connected to another upper opening of the second water pool; the thirteenth control valve, the fourteenth control valve, the fifteenth control valve and the sixteenth control valve are connected in parallel to the second electric valve;

[0012] The common containment tank assembly includes a third control valve, a fourth control valve, a seventh control valve, an eighth control valve, a third safety valve and a fourth safety valve. The other lower opening of the first water-vapor common containment tank is connected to the third control valve, the other lower opening of the second water-vapor common containment tank is connected to the fourth control valve, the seventh control valve and the third safety valve are both connected to the other upper opening of the first water-vapor common containment tank, and the eighth control valve and the fourth safety valve are both connected to the other upper opening of the second water-vapor common containment tank.

[0013] Preferably: the water tank assembly further comprises a first pressure sensor, a second pressure sensor, a fifth pressure sensor, a sixth pressure sensor, a first temperature sensor, a second temperature sensor, a fifth temperature sensor, a sixth temperature sensor, a first liquid level gauge and a second liquid level gauge; the first pressure sensor and the first temperature sensor are arranged at the upper part of the first water tank, the first liquid level gauge is arranged at the middle part of the first water tank, the fifth pressure sensor and the fifth temperature sensor are arranged at the lower part of the first water tank, the second pressure sensor and the second temperature sensor are arranged at the upper part of the second water tank, the second liquid level gauge is arranged at the middle part of the second water tank, and the sixth pressure sensor and the sixth temperature sensor are arranged at the lower part of the second water tank;

[0014] The common containment tank assembly includes a third pressure sensor, a fourth pressure sensor, a seventh pressure sensor, an eighth pressure sensor, a third temperature sensor, a fourth temperature sensor, a seventh temperature sensor, an eighth temperature sensor, a third liquid level gauge and a fourth liquid level gauge. The third pressure sensor and the third temperature sensor are arranged at the upper part of the first water-gas common containment tank, the third liquid level gauge is arranged in the middle part of the first water-gas common containment tank, the seventh pressure sensor and the seventh temperature sensor are arranged in the lower part of the first water-gas common containment tank, the fourth pressure sensor and the fourth temperature sensor are arranged at the upper part of the second water-gas common containment tank, the fourth liquid level gauge is arranged in the middle part of the second water-gas common containment tank, and the eighth pressure sensor and the eighth temperature sensor are arranged in the lower part of the second water-gas common containment tank.

[0015] Preferably: it also includes a fifth safety valve, a first electric valve and a flow meter, one end of the first electric valve is connected to the compressor, the other end of the first electric valve is connected to the fifth safety valve, and the flow meter is arranged between the third electric valve and the common tank assembly.

[0016] Preferably: it also includes a power supply, a load device and a control cabinet, the shaft end of the pumped-storage unit is connected to the load device, the power supply 8 is electrically connected to the variable-speed pumped-storage unit and the variable-frequency compressor, the power supply is used to supply power, the control cabinet is electrically connected to the power supply, and the control cabinet is electrically connected to the temperature sensor, electric valve, control valve, safety valve, pressure sensor, liquid level meter, flow meter, variable-frequency compressor, and variable-speed pumped-storage unit.

[0017] A variable speed water pumping compressed air mixed energy storage test verification method adopts a variable speed water pumping compressed air mixed energy storage test verification device, including pressure prefabrication test, energy storage test, power generation test, energy storage-enhanced heat exchange test, power generation-enhanced heat exchange test and near-constant head power generation test.

[0018] Preferably: comprising the following steps:

[0019] The pressure prefabrication test includes the following steps:

[0020] The second electric valve, the fifteenth control valve and the sixteenth control valve are opened, the variable frequency compressor is started, and pressurized gas is preformed into the first water-gas common container and the second water-gas common container; when the average value of the air pressure measured by the third pressure sensor in the first water-gas common container and the fourth pressure sensor in the second water-gas common container reaches the set pressure p1, the pressure preformation process ends;

[0021] The energy storage test includes the following steps:

[0022] When storing energy, the control software of the control cabinet starts the energy storage program, the ninth control valve, the eleventh control valve and the third electric valve are opened, the control software sets the speed of the variable-speed pumped storage unit, and the electric energy drives the variable-speed pumped storage unit to pump water, and the water in the first water tank is pumped into the first water-gas co-container tank to store compressed air; when the air pressure measured by the third pressure sensor in the first water-gas co-container tank reaches the set pressure p2, the energy storage process ends;

[0023] The power generation test includes the following steps:

[0024] When generating electricity, the control software starts the power generation program, the ninth control valve, the eleventh control valve and the third electric valve are opened, the compressed air in the first water-gas co-containment tank expands, and the water at the bottom of the first water-gas co-containment tank is squeezed out to the variable-speed pumped-storage unit to generate electricity, and the water after power generation returns to the first water tank; when the air pressure measured by the third pressure sensor in the first water-gas co-containment tank drops to the set pressure p1, the power generation process ends; the electric energy produced by the variable-speed pumped-storage unit is transmitted to the load device for consumption;

[0025] The energy storage-enhanced heat transfer test includes the following steps:

[0026] The control software starts the energy storage program, and the power source drives the variable speed pumped storage unit to extract the water in the first water tank and enter the compressed air in the first water-gas co-container tank to store energy. When the air pressure measured by the third pressure sensor reaches the set pressure p2, the energy storage process ends;

[0027] The control software starts the energy storage-enhanced heat exchange program, the tenth control valve, the twelfth control valve and the third electric valve are opened, the control software sets the speed of the variable-speed pumped storage unit, and the electric energy drives the variable-speed pumped storage unit to pump water, and the water in the second water tank is pumped into the second water-gas co-container tank to store compressed air; when the air pressure measured by the fourth pressure sensor in the second water-gas co-container tank reaches the set pressure p2, the energy storage-enhanced heat exchange process ends;

[0028] During the two energy storage processes, the air temperature changes measured by the third temperature sensor and the fourth temperature sensor are compared and analyzed to clarify the enhanced heat exchange effect of the metal tube bundle in the second water-gas co-container during the energy storage process;

[0029] The power generation-enhanced heat transfer test includes the following steps:

[0030] The control software starts the power generation program, and the compressed air in the first water-gas co-containment tank expands, squeezing the water at the bottom of the first water-gas co-containment tank to the variable-speed pumped storage unit to generate power, and the water after power generation returns to the first water tank; when the air pressure measured by the third pressure sensor in the first water-gas co-containment tank drops to the set pressure p1, the power generation process ends;

[0031] The control software starts the power generation-enhanced heat exchange program, the tenth control valve, the twelfth control valve and the third electric valve are opened, the high-pressure air in the second water-gas co-containment tank expands, and the water at the bottom of the second water-gas co-containment tank is discharged to the variable-speed pumped storage unit to generate power, and the water after power generation is returned to the second water tank 12; when the air pressure measured by the fourth pressure sensor in the second water-gas co-containment tank reaches the set pressure p1, the power generation-enhanced heat exchange test ends;

[0032] In these two power generation processes, the air temperature changes measured by the third temperature sensor and the fourth temperature sensor are compared and analyzed to clarify the enhanced heat exchange effect of the metal tube bundle in the second water-gas co-container during the power generation process;

[0033] The near-constant water head electrification test includes the following steps:

[0034] Under the near-constant water head power generation test, the control software starts the near-constant water head power generation program, the ninth control valve, the eleventh control valve and the third electric valve are opened, the compressed air in the first water-gas co-containment tank expands, and the water at the bottom of the first water-gas co-containment tank is squeezed out to the variable-speed pumped-storage unit to generate power; the air pressure in the first water-gas co-containment tank drops, and the operating head of the variable-speed pumped-storage unit decreases; when generating electricity, the variable-frequency compressor is started to fill the first water-gas co-containment tank with pressurized gas to supplement the air pressure in the first water-gas co-containment tank, thereby realizing the near-constant water head power generation operation of the variable-speed pumped-storage unit; the electric energy generated by the variable-speed pumped-storage unit is transmitted to the load equipment for consumption.

[0035] The present invention has the following beneficial effects:

[0036] The test device proposed in the present invention is reasonably designed and low in cost. It can operate extremely flexibly in pressure prefabrication, energy storage, power generation, enhanced heat exchange and near-constant head operating conditions. It can conduct comprehensive verification of key indicators to determine their feasibility, which not only ensures the safety of life and property, but also provides complete verification data support for the subsequent reliable operation of the device, which is convenient for repair and maintenance.

[0037] The test device proposed in the present invention can compare and verify the enhanced heat exchange effect of using metal tube bundles in the process of air compression and expansion; the reserved expansion interface can be used to add other heat exchange measures such as spray or spiral tube bundles.

[0038] The present invention adopts a variable speed pumped storage unit to realize the process of pumping water and generating electricity, which reduces equipment redundancy and system construction cost compared with the method of separately arranging water pumps and water turbines.

[0039] The variable speed pumped storage unit of the present invention has the advantages of variable speed operation, strong adaptability to variable water head and wide operating load range. Its use in a pumped water compressed air hybrid energy storage system can effectively improve the variable water head and variable load adaptability of hydraulic machinery.

[0040] The variable speed water pumping and air compression system verified by the present invention uses water and air as working media and can operate safely; the use of a variable speed pumped storage unit improves the operating stability and efficiency of the equipment, and after large-scale expansion, it can achieve a round-trip efficiency of more than 70%. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic diagram of a variable speed water pumping and air compression mixed energy storage test verification device described in a specific implementation mode of the present invention.

[0042] Figure 2 It is a flow chart of a variable speed water pumping and air pressure mixed energy storage test verification device in a pressure prefabrication test according to the present invention.

[0043] Figure 3 It is a flow chart of a variable speed water pumping and air pressure mixed energy storage test verification device in an energy storage test according to the present invention.

[0044] Figure 4 It is a flow chart of a variable speed water pumping and air compression mixed energy storage test verification device in a power generation test according to the present invention.

[0045] Figure 5 It is a flow chart of a variable speed water pumping and air compression mixed energy storage test verification device in an energy storage-enhanced heat exchange test.

[0046] Figure 6It is a flow chart of a variable speed water pumping and air compression hybrid energy storage test verification device in a power generation-enhanced heat exchange test.

[0047] Figure 7 It is a flow chart of a variable speed water pumping compressed air mixed energy storage test verification device described in the present invention in a near constant water head power generation test.

[0048] In the figure: 11-first water tank, 12-second water tank, 13-first water-gas common containment tank, 14-second water-gas common containment tank, 21-pumped storage unit, 31-compressor, 401-first electric valve, 402-second electric valve, 403-third electric valve, 411-first control valve, 412-second control valve, 413-third control valve, 414-fourth control valve, 415-fifth control valve, 416-sixth control valve, 417-seventh control valve, 418-eighth control valve, 419-ninth control valve, 420-tenth control valve, 421-eleventh control valve, 422-twelfth control valve, 423-thirteenth control valve, 424-fourteenth control valve, 425-fifteenth control valve, 426-sixteenth control valve, 431-first safety valve, 432-second safety valve, 433-third safety valve, 4 34-the fourth safety valve, 435-the fifth safety valve, 501-the first pressure sensor, 502-the second pressure sensor, 503-the third pressure sensor, 504-the fourth pressure sensor, 505-the fifth pressure sensor, 506-the sixth pressure sensor, 507-the seventh pressure sensor, 508-the eighth pressure sensor, 511-the first temperature sensor, 512-the second temperature sensor, 513-the third temperature sensor, 514-the fourth temperature sensor, 515-the fifth temperature sensor, 516-the sixth temperature sensor, 517-the seventh temperature sensor, 518-the eighth temperature sensor, 521-the first liquid level gauge, 522-the second liquid level gauge, 523-the third liquid level gauge, 524-the fourth liquid level gauge, 531-the flow meter, 6-the control cabinet, 71-the metal tube bundle, 8-the power supply, 9-the load device. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0050] Specific implementation method 1: Combination Figure 1The present embodiment is described. A variable speed pumped water compressed air hybrid energy storage test verification device of the present embodiment comprises a water tank assembly, a common containment tank assembly, a pumped storage unit 21 and a compressor 31. The water tank assembly, the pumped storage unit 21, the common containment tank assembly and the compressor 31 are connected in sequence. The pumped storage unit 21 is a variable speed pumped storage unit, and the compressor 31 is a variable frequency compressor.

[0051] The water tank assembly includes a first water tank 11, a second water tank 12, a ninth control valve 419 and a tenth control valve 420, a lower opening of the first water tank 11 is connected to one end of the ninth control valve 419, a lower opening of the second water tank 12 is connected to one end of the tenth control valve 420, and the other end of the ninth control valve 419 is connected to the other end of the tenth control valve 420 and then connected to one end of the pumped storage unit 21;

[0052] The common containment tank assembly includes a first water-gas common containment tank 13, a second water-gas common containment tank 14, a metal tube bundle 71, an eleventh control valve 421, a twelfth control valve 422, a fifteenth control valve 425 and a sixteenth control valve 426. An upper opening of the first water-gas common containment tank 13 is connected to one end of the fifteenth control valve 425. The second water-gas common containment tank 14 is provided with a metal tube bundle 71 for heat exchange. An upper opening of the second water-gas common containment tank 14 is connected to one end of the sixteenth control valve 426. The other end of the fifteenth control valve 425 is connected to the other end of the sixteenth control valve 426 and then connected to the compressor 31. A lower opening of the first water-gas common containment tank 13 is connected to one end of the eleventh control valve 421. A lower opening of the second water-gas common containment tank 14 is connected to one end of the twelfth control valve 422. The other end of the eleventh control valve 421 is connected to the other end of the twelfth control valve 422 and then connected to the other end of the pumped storage unit 21.

[0053] It also includes a second electric valve 402 and a third electric valve 403, the compressor 31 is connected to the fifteenth control valve 425 and the sixteenth control valve 426 through the second electric valve 402, and the pumped storage unit 21 is connected to the eleventh control valve 421 and the twelfth control valve 422 through the third electric valve 403;

[0054] The water pool tank assembly further includes a first control valve 411, a second control valve 412, a fifth control valve 415, a sixth control valve 416, a thirteenth control valve 423, a fourteenth control valve 424, a first safety valve 431 and a second safety valve 432. Another lower opening of the first water pool 11 is connected to the first control valve 411, another lower opening of the second water pool 12 is connected to the second control valve 412, the fifth control valve 415 and the first safety valve 431 are both connected to another upper opening of the first water pool 11, and the sixth control valve 416 and the second safety valve 432 are both connected to another upper opening of the second water pool 12; the thirteenth control valve 423, the fourteenth control valve 424, the fifteenth control valve 425 and the sixteenth control valve 426 are connected in parallel to the second electric valve 402;

[0055] The common containment tank assembly includes a third control valve 413, a fourth control valve 414, a seventh control valve 417, an eighth control valve 418, a third safety valve 433 and a fourth safety valve 434. Another lower opening of the first water-gas common containment tank 13 is connected to the third control valve 413, another lower opening of the second water-gas common containment tank 14 is connected to the fourth control valve 414, the seventh control valve 417 and the third safety valve 433 are both connected to another upper opening of the first water-gas common containment tank 13, and the eighth control valve 418 and the fourth safety valve 434 are both connected to another upper opening of the second water-gas common containment tank 14;

[0056] The water pool tank assembly further includes a first pressure sensor 501, a second pressure sensor 502, a fifth pressure sensor 505, a sixth pressure sensor 506, a first temperature sensor 511, a second temperature sensor 512, a fifth temperature sensor 515, a sixth temperature sensor 516, a first liquid level gauge 521 and a second liquid level gauge 522. The first water pool 11 is provided with the first pressure sensor 501 and the first temperature sensor 511 at the upper part, the first water pool 11 is provided with the first liquid level gauge 521 at the middle part, the first water pool 11 is provided with the fifth pressure sensor 505 and the fifth temperature sensor 515 at the lower part, the second water pool 12 is provided with the second pressure sensor 502 and the second temperature sensor 512 at the upper part, the second water pool 12 is provided with the second liquid level gauge 522 at the middle part, and the second water pool 12 is provided with the sixth pressure sensor 506 and the sixth temperature sensor 516 at the lower part;

[0057] The common containment tank assembly includes a third pressure sensor 503, a fourth pressure sensor 504, a seventh pressure sensor 507, an eighth pressure sensor 508, a third temperature sensor 513, a fourth temperature sensor 514, a seventh temperature sensor 517, an eighth temperature sensor 518, a third liquid level gauge 523 and a fourth liquid level gauge 524. The third pressure sensor 503 and the third temperature sensor 513 are arranged at the upper part of the first water-gas common containment tank 13, the third liquid level gauge 523 is arranged at the middle part of the first water-gas common containment tank 13, the seventh pressure sensor 507 and the seventh temperature sensor 517 are arranged at the lower part of the first water-gas common containment tank 13, the fourth pressure sensor 504 and the fourth temperature sensor 514 are arranged at the upper part of the second water-gas common containment tank 14, the fourth liquid level gauge 524 is arranged at the middle part of the second water-gas common containment tank 14, and the eighth pressure sensor 508 and the eighth temperature sensor 518 are arranged at the lower part of the second water-gas common containment tank 14; it is convenient to detect the pressure, liquid level and temperature conditions in real time;

[0058] It also includes a fifth safety valve 435, a first electric valve 401 and a flow meter 531. One end of the first electric valve 401 and the second electric valve 402 are connected to one end of the compressor 31, and the other end of the first electric valve 401 is connected to the fifth safety valve 435. The flow meter 531 is arranged between the third electric valve 403 and the common container assembly;

[0059] It also includes a power supply 8, a load device 9 and a control cabinet 6. The shaft end of the pumped-storage unit 21 is connected to the load device 9. The power supply 8 is electrically connected to the variable-speed pumped-storage unit 21 and the variable-frequency compressor 31. The power supply 8 is used for power supply. The control cabinet 6 is electrically connected to the power supply 8. The control cabinet 6 is electrically connected to the temperature sensor 511-518, the electric valve 401-403, the control valve 411-426, the safety valve 431-435, the pressure sensor 501-508, the liquid level meter 521-524, the flow meter 531, the variable-frequency compressor 31, and the variable-speed pumped-storage unit 21. The load 9 can be a load device.

[0060] Specific implementation method 2: Combination Figure 1-7The present embodiment is described. A variable speed pumping and compressed air mixed energy storage test verification method of the present embodiment adopts the variable speed pumping and compressed air mixed energy storage test verification device. The first water tank 11 and the second water tank 12 are connected below by a water pipe and at the top by a gas pipe. The variable speed pumped storage unit 21 is connected to the first water tank 11 and the second water tank 12 respectively through a bifurcated pipe, and the variable speed pumped storage unit 21 is connected to the power supply 8. The first water-gas common containment tank 13 and the second water-gas common containment tank 14 are connected to the variable speed pumped storage unit 21 after being collected through a pipe. The variable frequency compressor 31 is connected to the first water tank 11, the second water tank 12, the first water-gas common containment tank 13 and the second water-gas common containment tank 14 respectively, and is used to inject air into the first water tank 11, the second water tank 12, the first water-gas common containment tank 13 and the second water-gas common containment tank 14, and the variable frequency compressor is connected to the power supply 8.

[0061] When storing energy, the electric energy in the power source 8 drives the variable speed pumped storage unit 21 to pump water into the first water-gas co-container tank 13 and the second water-gas co-container tank 14 to store compressed air; when generating electricity, the air in the first water-gas co-container tank 13 and the second water-gas co-container tank 14 expands, squeezing the water in the first water-gas co-container tank 13 and the second water-gas co-container tank 14 to the variable speed pumped storage unit to generate electricity;

[0062] The first water pool 11 and the second water pool 12 are connected at the bottom by a water pipe, and at the top by a gas pipeline; the first water-gas co-container tank 13 and the second water-gas co-container tank 14 are connected at the bottom by a water pipe, and at the top by a gas pipeline;

[0063] The downstream end of the variable speed pumped storage unit 21 is connected to the water pipes below the first water tank 11 and the second water tank 12 through a water pipe; the upstream end of the variable speed pumped storage unit 21 is connected to the water pipes below the first water-gas co-containment tank 13 and the second water-gas co-containment tank 14 through a water pipe;

[0064] The variable frequency compressor 31 is connected to the first water tank 11, the second water tank 12, the first water-gas co-container tank 13 and the second water-gas co-container tank 14 through a gas pipeline. A thirteenth control valve 423 is installed between the first water tank 11 and the gas pipeline, a fourteenth control valve 424 is installed between the second water tank 12 and the gas pipeline, a fifteenth control valve 425 is installed between the first water-gas co-container tank 13 and the gas pipeline, and a sixteenth control valve 426 is installed between the second water-gas co-container tank 14 and the gas pipeline. A second electric valve 402 is installed at the outlet of the variable frequency compressor 31 to flexibly control the on-off of the gas pipeline;

[0065] A three-way pipe is installed on the top of the first water tank 11, which is respectively connected to the first safety valve 431 and the fifth control valve 415; a three-way pipe is installed on the top of the second water tank 12, which is respectively connected to the second safety valve 432 and the sixth control valve 416; a three-way pipe is installed on the top of the first water-gas co-containment tank 13, which is respectively connected to the third safety valve 433 and the seventh control valve 417; a three-way pipe is installed on the top of the second water-gas co-containment tank 14, which is respectively connected to the fourth safety valve 434 and the eighth control valve 418; the safety valve can ensure the safe operation of the tank body during air compression, and the pipeline where the control valve is located is an expansion interface, which can be used to expand the spare needs;

[0066] A first pressure sensor 501 is installed at the top of the first water pool 11, a second pressure sensor 502 is installed at the top of the second water pool 12, a third pressure sensor 503 is installed at the top of the first water-gas co-containment tank 13, and a fourth pressure sensor 504 is installed at the top of the second water-gas co-containment tank 14; a fifth pressure sensor 505 is installed at the bottom of the first water pool 11, a sixth pressure sensor 506 is installed at the bottom of the second water pool 12, a seventh pressure sensor 507 is installed at the bottom of the first water-gas co-containment tank 13, and an eighth pressure sensor 508 is installed at the bottom of the second water-gas co-containment tank 14; a first temperature sensor 511 is installed at the top of the first water pool 11, and a second temperature sensor 512 is installed at the top of the second water pool 12. 2. A third temperature sensor 513 is installed on the top of the first water-gas co-containment tank 13, and a fourth temperature sensor 514 is installed on the top of the second water-gas co-containment tank 14; a fifth temperature sensor 515 is installed on the bottom of the first water pool 11, a sixth temperature sensor 516 is installed on the bottom of the second water pool 12, a seventh temperature sensor 517 is installed on the bottom of the first water-gas co-containment tank 13, and an eighth temperature sensor 518 is installed on the bottom of the second water-gas co-containment tank 14; a first liquid level gauge 521 is installed on the side of the first water pool 11, a second liquid level gauge 522 is installed on the side of the second water pool 12, a third liquid level gauge 523 is installed on the side of the first water-gas co-containment tank 13, and a fourth liquid level gauge 524 is installed on the side of the second water-gas co-containment tank 14;

[0067] Some steel pipes are installed in the second water-gas co-container 13 to enhance the heat transfer process during air compression and expansion and to achieve air temperature amplitude control;

[0068] The method includes a pressure prefabrication test, an energy storage test, a power generation test, an energy storage-enhanced heat exchange test, a power generation-enhanced heat exchange test and a near-constant water head power generation test;

[0069] The following steps are involved:

[0070] ①Pressure prefabrication test includes the following steps:

[0071] The second electric valve 402, the fifteenth control valve 425 and the sixteenth control valve 426 are opened, the variable frequency compressor is started, and pressurized gas is preformed into the first water-gas common containment tank 13 and the second water-gas common containment tank 14; when the average value of the air pressure measured by the third pressure sensor 503 in the first water-gas common containment tank 13 and the fourth pressure sensor 504 in the second water-gas common containment tank 14 reaches the set pressure p1, the pressure preformation process ends;

[0072] ②The energy storage test includes the following steps:

[0073] When storing energy, the control software of the control cabinet 6 starts the energy storage program, the ninth control valve 419, the eleventh control valve 421 and the third electric valve 403 are opened, the control software sets the speed of the variable-speed pumped storage unit 21, and the electric energy drives the variable-speed pumped storage unit 21 to pump water, and the water in the first water tank 11 is pumped into the first water-gas co-containment tank 13 to store compressed air; when the air pressure measured by the third pressure sensor 503 in the first water-gas co-containment tank 13 reaches the set pressure p2, the energy storage process ends;

[0074] ③The power generation test includes the following steps:

[0075] When generating electricity, the control software starts the power generation program, the ninth control valve 419, the eleventh control valve 421 and the third electric valve 403 are opened, and the compressed air in the first water-gas co-containment tank 13 expands, squeezing the water at the bottom of the first water-gas co-containment tank 13 to the variable-speed pumped-storage unit 21 to generate electricity, and the water after power generation returns to the first water tank 11; when the air pressure measured by the third pressure sensor 503 in the first water-gas co-containment tank 13 drops to the set pressure p1, the power generation process ends; the electric energy produced by the variable-speed pumped-storage unit is transmitted to the load device 9 for consumption;

[0076] ④ The energy storage-enhanced heat exchange test includes the following steps:

[0077] The control software starts the energy storage program, and the power supply 8 drives the variable speed pumped storage unit to extract the water in the first water tank 11 into the compressed air in the first water-gas co-container 13 to store energy. When the air pressure measured by the third pressure sensor 503 reaches the set pressure p2, the energy storage process ends;

[0078] Then, the control software starts the energy storage-enhanced heat exchange program, the tenth control valve 420, the twelfth control valve 422 and the third electric valve 403 are opened, the control software sets the speed of the variable-speed pumped storage unit 21, and the electric energy drives the variable-speed pumped storage unit 21 to pump water, and the water in the second water tank 12 is pumped into the second water-gas co-containment tank 14 to store compressed air; when the air pressure measured by the fourth pressure sensor 504 in the second water-gas co-containment tank 14 reaches the set pressure p2, the energy storage-enhanced heat exchange process ends;

[0079] By comparison, the air temperature change process measured by the third temperature sensor 511 and the fourth temperature sensor 514 during the two energy storage processes is used to clarify the enhanced heat exchange effect of the metal tube bundle 71 in the second water-gas co-container tank 14 during the energy storage process;

[0080] ⑤The power generation-enhanced heat exchange test includes the following steps:

[0081] The control software starts the power generation program, and the compressed air in the first water-gas co-containment tank 13 expands, squeezing the water at the bottom of the first water-gas co-containment tank 13 to the variable-speed pumped storage unit 21 to generate power, and the water after power generation returns to the first water tank 11; when the air pressure measured by the third pressure sensor 503 in the first water-gas co-containment tank 13 drops to the set pressure p1, the power generation process ends;

[0082] Then, the control software starts the power generation-enhanced heat exchange program, the tenth control valve 420, the twelfth control valve 422 and the third electric valve 403 are opened, the high-pressure air in the second water-gas co-containment tank 14 expands, and the water at the bottom of the second water-gas co-containment tank 14 is discharged to the variable-speed pumped storage unit 21 to generate power, and the water after power generation is returned to the second water tank 12; when the air pressure measured by the fourth pressure sensor 504 in the second water-gas co-containment tank 14 reaches the set pressure p1, the power generation-enhanced heat exchange test ends;

[0083] By comparing the air temperature changes measured by the third temperature sensor 513 and the fourth temperature sensor 514 during the two power generation processes, the enhanced heat exchange effect of the metal tube bundle 71 in the second water-gas co-container tank 14 during the power generation process is clarified;

[0084] ⑥ The near-constant water head electrification test includes the following steps:

[0085] Under the near-constant water head power generation test, the control software starts the near-constant water head power generation program, the ninth control valve 419, the eleventh control valve 421 and the third electric valve 403 are opened, and the compressed air in the first water-gas co-containment tank 13 expands, squeezing the water at the bottom of the first water-gas co-containment tank 13 to the variable-speed pumped-storage unit 21 to generate power; the air pressure in the first water-gas co-containment tank 13 drops, and the operating head of the variable-speed pumped-storage unit 21 decreases; when generating electricity, the variable-frequency compressor 31 is started to fill the first water-gas co-containment tank 13 with pressurized gas to supplement the air pressure in the first water-gas co-containment tank 13, thereby realizing the near-constant water head power generation operation of the variable-speed pumped-storage unit 21; the electric energy generated by the variable-speed pumped-storage unit 21 is transmitted to the load device 9 for consumption.

[0086] It should be noted that in the above embodiments, as long as the technical solutions are not contradictory, they can be arranged and combined, and those skilled in the art can exhaust all possibilities based on the mathematical knowledge of arrangement and combination. Therefore, the present invention will no longer describe the technical solutions after arrangement and combination one by one, but it should be understood that the technical solutions after arrangement and combination have been disclosed by the present invention.

[0087] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A variable speed pumping water pressure gas mixed energy storage test verification device, characterized in that: The invention comprises a water tank assembly, a common tank assembly, a pumped storage unit (21) and a compressor (31). The water tank assembly, the pumped storage unit (21), the common tank assembly and the compressor (31) are connected in sequence. The pumped storage unit (21) is a variable speed pumped storage unit, and the compressor (31) is a variable frequency compressor.

2. A variable speed pumping water pressure gas mixed energy storage test verification device according to claim 1, characterized in that: The water tank assembly comprises a first water tank (11), a second water tank (12), a ninth control valve (419) and a tenth control valve (420); a lower opening of the first water tank (11) is connected to one end of the ninth control valve (419); a lower opening of the second water tank (12) is connected to one end of the tenth control valve (420); the other end of the ninth control valve (419) is connected to the other end of the tenth control valve (420) and then connected to one end of the pumped storage unit (21).

3. A variable speed pumping water pressure gas mixed energy storage test verification device according to claim 2, characterized in that: The common containment tank assembly comprises a first water-gas common containment tank (13), a second water-gas common containment tank (14), a metal tube bundle (71), an eleventh control valve (421), a twelfth control valve (422), a fifteenth control valve (425) and a sixteenth control valve (426); an upper opening of the first water-gas common containment tank (13) is connected to one end of the fifteenth control valve (425); a metal tube bundle (71) is arranged in the second water-gas common containment tank (14); an upper opening of the second water-gas common containment tank (14) is connected to one end of the sixteenth control valve (426); The first water-gas co-container tank (13) is connected to one end of the first control valve (426), the other end of the fifteenth control valve (425) is connected to the other end of the sixteenth control valve (426) and then connected to the compressor (31), a lower opening of the first water-gas co-container tank (13) is connected to one end of the eleventh control valve (421), a lower opening of the second water-gas co-container tank (14) is connected to one end of the twelfth control valve (422), and the other end of the eleventh control valve (421) is connected to the other end of the twelfth control valve (422) and then connected to the other end of the pumped storage unit (21).

4. A variable speed pumping water pressure gas mixed energy storage test verification device according to claim 3, characterized in that: The invention also includes a second electric valve (402) and a third electric valve (403); the compressor (31) is connected to a fifteenth control valve (425) and a sixteenth control valve (426) via the second electric valve (402); and the pumped storage unit (21) is connected to an eleventh control valve (421) and a twelfth control valve (422) via the third electric valve (403).

5. A variable speed pumping water pressure gas mixed energy storage test verification device according to claim 4, characterized in that: The water pool tank assembly further comprises a first control valve (411), a second control valve (412), a fifth control valve (415), a sixth control valve (416), a thirteenth control valve (423), a fourteenth control valve (424), a first safety valve (431) and a second safety valve (432); another lower opening of the first water pool (11) is connected to the first control valve (411), another lower opening of the second water pool (12) is connected to the second control valve (412); the fifth control valve (415) and the first safety valve (431) are both connected to another upper opening of the first water pool (11), and the sixth control valve (416) and the second safety valve (432) are both connected to another upper opening of the second water pool (12); the thirteenth control valve (423), the fourteenth control valve (424), the fifteenth control valve (425) and the sixteenth control valve (426) are connected in parallel to the second electric valve (402); The common containment tank assembly comprises a third control valve (413), a fourth control valve (414), a seventh control valve (417), an eighth control valve (418), a third safety valve (433) and a fourth safety valve (434); another lower opening of the first water-gas common containment tank (13) is connected to the third control valve (413); another lower opening of the second water-gas common containment tank (14) is connected to the fourth control valve (414); the seventh control valve (417) and the third safety valve (433) are both connected to another upper opening of the first water-gas common containment tank (13); and the eighth control valve (418) and the fourth safety valve (434) are both connected to another upper opening of the second water-gas common containment tank (14).

6. A variable speed pumping water pressure gas mixed energy storage test verification device according to claim 5, characterized in that: The water pool tank assembly further comprises a first pressure sensor (501), a second pressure sensor (502), a fifth pressure sensor (505), a sixth pressure sensor (506), a first temperature sensor (511), a second temperature sensor (512), a fifth temperature sensor (515), a sixth temperature sensor (516), a first liquid level gauge (521) and a second liquid level gauge (522); the first water pool (11) is provided with the first pressure sensor (501) and the first temperature sensor (511) at the top, the first water pool (11) is provided with the first liquid level gauge (521) at the middle, the first water pool (11) is provided with the fifth pressure sensor (505) and the fifth temperature sensor (515) at the bottom, the second water pool (12) is provided with the second pressure sensor (502) and the second temperature sensor (512) at the top, the second water pool (12) is provided with the second liquid level gauge (522) at the middle, and the second water pool (12) is provided with the sixth pressure sensor (506) and the sixth temperature sensor (516) at the bottom; The common containment tank assembly comprises a third pressure sensor (503), a fourth pressure sensor (504), a seventh pressure sensor (507), an eighth pressure sensor (508), a third temperature sensor (513), a fourth temperature sensor (514), a seventh temperature sensor (517), an eighth temperature sensor (518), a third liquid level gauge (523) and a fourth liquid level gauge (524). The third pressure sensor (503), the third temperature sensor (513) and the eighth pressure sensor (508) are arranged on the upper part of the first water-gas common containment tank (13). A third liquid level gauge (523) is arranged in the middle of a water-gas co-containment tank (13), a seventh pressure sensor (507) and a seventh temperature sensor (517) are arranged in the lower part of the first water-gas co-containment tank (13), a fourth pressure sensor (504) and a fourth temperature sensor (514) are arranged in the upper part of the second water-gas co-containment tank (14), a fourth liquid level gauge (524) is arranged in the middle of the second water-gas co-containment tank (14), and an eighth pressure sensor (508) and an eighth temperature sensor (518) are arranged in the lower part of the second water-gas co-containment tank (14).

7. A variable speed pumping water pressure gas mixed energy storage test verification device according to claim 6, characterized in that: The invention also includes a fifth safety valve (435), a first electric valve (401) and a flow meter (531), wherein one end of the first electric valve (401) is connected to the compressor (31), and the other end of the first electric valve (401) is connected to the fifth safety valve (435), and the flow meter (531) is arranged between the third electric valve (403) and the common container assembly.

8. The variable speed pumping water pressure gas mixed energy storage test verification device according to claim 7 is characterized by: The invention also comprises a power supply (8), a load device (9) and a control cabinet (6); the shaft end of the pumped storage unit (21) is connected to the load device (9); the power supply (8) is electrically connected to the variable speed pumped storage unit (21) and the variable frequency compressor (31); the control cabinet (6) is electrically connected to the temperature sensor (511-518), the electric valve (401-403), the control valve (411-426), the safety valve (431-435), the pressure sensor (501-508), the liquid level meter (521-524), the flow meter (531), the variable frequency compressor and the variable speed pumped storage unit.

9. A variable speed pumping water pressure gas mixed energy storage test verification method, characterized in that: A variable speed pumping compressed air mixed energy storage test verification device as described in any one of claims 1 to 8 is used, and the method includes pressure prefabrication test, energy storage test, power generation test, energy storage-enhanced heat exchange test, power generation-enhanced heat exchange test and near-constant head power generation test.

10. A variable speed pumping water pressure gas mixed energy storage test verification device according to claim 9, characterized in that: The following steps are involved: ①Pressure prefabrication test includes the following steps: The second electric valve (402), the fifteenth control valve (425) and the sixteenth control valve (426) are opened, the variable frequency compressor is started, and pressurized gas is pre-prepared into the first water-gas common containment tank (13) and the second water-gas common containment tank (14); when the average value of the air pressure measured by the third pressure sensor (503) in the first water-gas common containment tank (13) and the fourth pressure sensor (504) in the second water-gas common containment tank (14) reaches the set pressure p1, the pressure pre-preparation process ends; ②The energy storage test includes the following steps: When storing energy, the control software of the control cabinet (6) starts the energy storage program, the ninth control valve (419), the eleventh control valve (421) and the third electric valve (403) are opened, the control software sets a speed of the variable speed pumped storage unit (21), and the electric energy drives the variable speed pumped storage unit (21) to pump water, and the water in the first water tank (11) is pumped into the first water-gas co-container tank (13) to store compressed air; when the air pressure measured by the third pressure sensor (503) in the first water-gas co-container tank (13) reaches the set pressure p2, the energy storage process ends; ③The power generation test includes the following steps: When generating electricity, the control software starts the power generation program, the ninth control valve (419), the eleventh control valve (421) and the third electric valve (403) are opened, the compressed air in the first water-gas co-containment tank (13) expands, and the water at the bottom of the first water-gas co-containment tank (13) is squeezed out to the variable speed pumped storage unit (21) to generate electricity, and the water after power generation is returned to the first water tank (11); when the air pressure measured by the third pressure sensor (503) in the first water-gas co-containment tank (13) drops to the set pressure p1, the power generation process ends; the electric energy generated by the variable speed pumped storage unit is transmitted to the load device (9) for consumption; ④ The energy storage-enhanced heat exchange test includes the following steps: The control software starts the energy storage program, and the power supply (8) drives the variable speed pumped storage unit to extract the water in the first water tank (11) and enter the compressed air in the first water-gas co-container tank (13) to store energy. When the air pressure measured by the third pressure sensor (503) reaches the set pressure p2, the energy storage process ends; The control software starts the energy storage-enhanced heat exchange program, the tenth control valve (420), the twelfth control valve (422) and the third electric valve (403) are opened, the control software sets a speed of the variable speed pumped storage unit (21), and the electric energy drives the variable speed pumped storage unit (21) to pump water, and the water in the second water tank (12) is pumped into the second water-gas co-containment tank (14) to store compressed air; when the air pressure measured by the fourth pressure sensor (504) in the second water-gas co-containment tank (14) reaches the set pressure p2, the energy storage-enhanced heat exchange process ends; During the two energy storage processes, the air temperature change processes measured by the third temperature sensor (513) and the fourth temperature sensor (514) are compared and analyzed to clarify the enhanced heat exchange effect of the metal tube bundle (71) in the second water-gas co-container tank (14) during the energy storage process; ⑤The power generation-enhanced heat exchange test includes the following steps: The control software starts the power generation program, the compressed air in the first water-gas co-containment tank (13) expands, and the water at the bottom of the first water-gas co-containment tank (13) is squeezed out to the variable speed pumped storage unit (21) to generate power, and the water after power generation is returned to the first water tank (11); when the air pressure measured by the third pressure sensor (503) in the first water-gas co-containment tank (13) drops to the set pressure p1, the power generation process ends; The control software starts the power generation-enhanced heat exchange program, the tenth control valve (420), the twelfth control valve (422) and the third electric valve (403) are opened, the high-pressure air in the second water-gas co-containment tank (14) expands, and the water at the bottom of the second water-gas co-containment tank (14) is discharged to the variable-speed pumped storage unit (21) to generate power, and the water after power generation is returned to the second water tank 12; when the air pressure measured by the fourth pressure sensor (504) in the second water-gas co-containment tank (14) reaches the set pressure p1, the power generation-enhanced heat exchange test ends; In the two power generation processes, the air temperature change process measured by the third temperature sensor (513) and the fourth temperature sensor (514) is compared and analyzed to clarify the enhanced heat exchange effect of the metal tube bundle (71) in the second water-gas co-container tank (14) during the power generation process; ⑥ The near-constant water head electrification test includes the following steps: In the near-constant water head power generation test, the control software starts the near-constant water head power generation program, the ninth control valve (419), the eleventh control valve (421) and the third electric valve (403) are opened, the compressed air in the first water-gas co-containment tank (13) expands, and the water at the bottom of the first water-gas co-containment tank (13) is squeezed out to the variable speed pumped storage unit (21) to perform work and generate electricity; the air pressure in the first water-gas co-containment tank (13) decreases, and the operating head of the variable speed pumped storage unit (21) decreases; when generating electricity, the variable frequency compressor (31) is started to fill the first water-gas co-containment tank (13) with pressurized gas to supplement the air pressure in the first water-gas co-containment tank (13), thereby realizing the near-constant water head power generation operation of the variable speed pumped storage unit (21); the electric energy generated by the variable speed pumped storage unit (21) is transmitted to the load device (9) for consumption.

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