阅读说明：本技术 一种以二氧化碳为工质的调峰储能装置及其控制方法 (Peak-shaving energy storage device using carbon dioxide as working medium and control method thereof ) 是由 谢永慧 孙磊 张荻 于 2019-09-30 设计创作，主要内容包括：本发明公开了一种以二氧化碳为工质的调峰储能装置及其控制方法,包括：储能系统和释能系统；储能系统包括二氧化碳储能循环子系统、第一储能子系统和第二储能子系统；其中,二氧化碳储能循环子系统用于实现二氧化碳的储能热力循环；第一储能子系统用于实现冷热量的基础储能；第二储能子系统用于实现能量的多级存储；释能系统包括二氧化碳释能循环子系统、第一释能子系统和第二释能子系统；其中,二氧化碳释能循环子系统用于实现二氧化碳的释能热力循环；第一释能子系统用于实现冷热量的基础释能；第二释能子系统用于实现能量的多级释放。本发明能够实现多级能量存储与释放,灵活地进行移峰填谷。(The invention discloses a peak regulation energy storage device taking carbon dioxide as a working medium and a control method thereof, wherein the peak regulation energy storage device comprises the following steps: an energy storage system and an energy release system; the energy storage system comprises a carbon dioxide energy storage circulation subsystem, a first energy storage subsystem and a second energy storage subsystem; the carbon dioxide energy storage circulation subsystem is used for realizing energy storage thermodynamic circulation of carbon dioxide; the first energy storage subsystem is used for realizing basic energy storage of cold and heat; the second energy storage subsystem is used for realizing multi-stage energy storage; the energy release system comprises a carbon dioxide energy release circulation subsystem, a first energy release subsystem and a second energy release subsystem; the carbon dioxide energy release circulation subsystem is used for realizing the energy release thermodynamic circulation of the carbon dioxide; the first energy release subsystem is used for realizing basic energy release of cold and heat; the second energy release subsystem is used for realizing multi-stage release of energy. The invention can realize multi-level energy storage and release and flexibly carry out peak shifting and valley filling.)

1. A peak regulation energy storage device taking carbon dioxide as working medium is characterized by comprising: an energy storage system and an energy release system;

the energy storage system comprises a carbon dioxide energy storage circulation subsystem, a first energy storage subsystem and a second energy storage subsystem; the carbon dioxide energy storage circulation subsystem comprises a first energy storage turbine (1), a second energy storage turbine (2), a first energy storage heat exchanger (3), a second energy storage heat exchanger (4), a first energy storage compressor (5), a second energy storage compressor (6), a third energy storage heat exchanger (7) and a fourth energy storage heat exchanger (8) and is used for realizing energy storage thermodynamic circulation of carbon dioxide; the first energy storage subsystem comprises a first energy storage heat exchanger (3), a third energy storage heat exchanger (7), a second low-temperature storage tank (11), a second high-temperature storage tank (12), a first ice-water mixed storage tank (15) and a second ice-water mixed storage tank (16) and is used for realizing basic energy storage of cold and heat; the second energy storage subsystem comprises a fourth energy storage heat exchanger (8), a first low-temperature storage tank (9), a first high-temperature storage tank (10), a high-pressure carbon dioxide storage tank (13) and a low-pressure carbon dioxide storage tank (14) and is used for realizing multi-stage storage of energy;

the energy release system comprises a carbon dioxide energy release circulation subsystem, a first energy release subsystem and a second energy release subsystem; the carbon dioxide energy release circulation subsystem comprises a first energy release turbine (17), a second energy release turbine (18), a first energy release heat exchanger (19), a second energy release heat exchanger (20), a first energy release compressor (21), a second energy release compressor (22), a third energy release heat exchanger (23), a fourth energy release heat exchanger (24) and an external heat source (25), and is used for realizing energy release thermodynamic circulation of carbon dioxide; the first energy release subsystem comprises a second energy release heat exchanger (20), a third energy release heat exchanger (23), a second low-temperature storage tank (11), a second high-temperature storage tank (12), a first ice-water mixed storage tank (15) and a second ice-water mixed storage tank (16) and is used for realizing basic energy release of cold and heat; the second energy release subsystem comprises a fourth energy release heat exchanger (24), an external heat source (25), a first low-temperature storage tank (9), a first high-temperature storage tank (10), a high-pressure carbon dioxide storage tank (13) and a low-pressure carbon dioxide storage tank (14) and is used for realizing multi-stage energy release.

2. The peak-shaving energy storage device taking carbon dioxide as working medium according to claim 1, wherein the energy storage system specifically comprises:

the inlet of the second energy storage turbine (2) is communicated with the outlet of the first energy storage turbine (1); the outlet of the second energy storage turbine (2) is communicated with the first inlet of the first energy storage heat exchanger (3); an outlet of the first ice-water mixed storage tank (15) is communicated with a second inlet of the first energy storage heat exchanger (3) through a first pipeline; an inlet of the second ice-water mixed storage tank (16) is communicated with a second outlet of the first energy storage heat exchanger (3); a first outlet of the first energy storage heat exchanger (3) is communicated with a first inlet of the second energy storage heat exchanger (4); a first outlet of the second energy storage heat exchanger (4) is communicated with an inlet of the low-pressure carbon dioxide storage tank (14) through a second pipeline; an inlet of the first energy storage compressor (5) is communicated with a first outlet of the second energy storage heat exchanger (4); a first outlet of the first energy storage compressor (5) is communicated with a first inlet of a fourth energy storage heat exchanger (8) through a third pipeline, and a first outlet of the fourth energy storage heat exchanger (8) is communicated with an inlet of the second energy storage turbine (2); an outlet of the first cryogenic storage tank (9) is communicated with a second inlet of the fourth energy storage heat exchanger (8) through a fourth pipeline; an inlet of the first high-temperature storage tank (10) is communicated with a second outlet of the fourth energy storage heat exchanger (8); the inlet of the second energy storage compressor (6) is communicated with the outlet of the first energy storage compressor (5); the outlet of the second energy storage compressor (6) is communicated with the first inlet of the third energy storage heat exchanger (7); a first outlet of the third energy storage heat exchanger (7) is communicated with a second inlet of the second energy storage heat exchanger (4), and a second outlet of the second energy storage heat exchanger (4) is communicated with an inlet of the first energy storage turbine (1); a first outlet of the third energy storage heat exchanger (7) is communicated with an inlet of the high-pressure carbon dioxide storage tank (13) through a fifth pipeline; an outlet of the second cryogenic storage tank (11) is communicated with a second inlet of the third energy storage heat exchanger (7) through a sixth pipeline; and the inlet of the second high-temperature storage tank (12) is communicated with the second outlet of the third energy storage heat exchanger (7).

3. The peak-shaving energy storage device taking carbon dioxide as working medium according to claim 2, wherein a fifth control valve (105) is arranged on the first pipeline; a fourth control valve (104) is arranged on the second pipeline; a first control valve (101) is arranged on the third pipeline; a second control valve (102) is arranged on the fourth pipeline; a third control valve (103) is arranged on the fifth pipeline; and a sixth control valve (106) is arranged on the sixth pipeline.

4. The peak-shaving energy storage device taking carbon dioxide as working medium according to claim 1, wherein the energy release system specifically comprises:

the inlet of the second energy release turbine (18) is communicated with the outlet of the first energy release turbine (17); the outlet of the second energy release turbine (18) is communicated with the first inlet of the first energy release heat exchanger (19); a first outlet of the first energy releasing heat exchanger (19) is communicated with a first inlet of the second energy releasing heat exchanger (20); an outlet of the second ice water mixed storage tank (16) is communicated with a second inlet of the second energy-releasing heat exchanger (20) through a seventh pipeline, and a second outlet of the second energy-releasing heat exchanger (20) is communicated with the first ice water mixed storage tank (15); the inlet of the first energy releasing compressor (21) is communicated with the first outlet of the second energy releasing heat exchanger (20); the low-pressure carbon dioxide storage tank (14) is communicated with an inlet of the first energy release compressor (21) through an eighth pipeline; a first outlet of the first energy releasing compressor (21) is communicated with a first inlet of a fourth energy releasing heat exchanger (24) through a ninth pipeline, and a first outlet of the fourth energy releasing heat exchanger (24) is communicated with an inlet of a second energy releasing turbine (18); an outlet of the first high-temperature storage tank (10) is communicated with a second inlet of a fourth energy release heat exchanger (24) through a tenth pipeline, and a second outlet of the fourth energy release heat exchanger (24) is communicated with an inlet of the first low-temperature storage tank (9); the inlet of the second energy-releasing compressor (22) is communicated with the second outlet of the first energy-releasing compressor (21); the outlet of the second energy-releasing compressor (22) is communicated with the second inlet of the first energy-releasing heat exchanger (19); the high-pressure carbon dioxide storage tank (13) is communicated with a second inlet of the first energy-releasing heat exchanger (19) through an eleventh pipeline; the second outlet of the first energy releasing heat exchanger (19) is communicated with the first inlet of the third energy releasing heat exchanger (23); a first outlet of the third energy-releasing heat exchanger (23) is communicated with a first inlet of the first energy-releasing turbine (17) through a twelfth pipeline; an outlet of the second high-temperature storage tank (12) is communicated with a second inlet of a third energy-releasing heat exchanger (23) through a thirteenth pipeline, and a second outlet of the third energy-releasing heat exchanger (23) is communicated with an inlet of the second low-temperature storage tank (11); an inlet of the external heat source (25) is communicated with the first outlet of the third energy-releasing heat exchanger (23) through a fourteenth pipeline.

5. The peak-shaving energy storage device taking carbon dioxide as working medium according to claim 4, wherein a thirteenth control valve (207) is arranged on the seventh pipeline; a twelfth control valve (206) is arranged on the eighth pipeline; a seventh control valve (201) is arranged on the ninth pipeline; an eighth control valve (202) is arranged on the tenth pipeline; an eleventh control valve (205) is arranged on the eleventh pipeline; a ninth control valve (203) is arranged on the twelfth pipeline; a fourteenth control valve (208) is arranged on the thirteenth pipeline; a tenth control valve (204) is arranged on the fourteenth pipeline.

6. The peak-shaving energy storage device taking carbon dioxide as a working medium according to claim 1, wherein the second energy storage turbine (2) is coaxially connected with the first energy storage compressor (5) and externally connected with a motor; the first energy storage turbine (1) is coaxially connected with the first energy storage compressor (6) and is externally connected with an electric motor.

7. The peak-shaving energy storage device taking carbon dioxide as a working medium according to claim 1, wherein a first energy-releasing compressor (21) is coaxially connected with a second energy-releasing turbine (18) and externally connected with a generator; the second energy release compressor (22) is coaxially connected with the first energy release turbine (17) and externally connected with a generator.

8. A peak regulation energy storage device taking carbon dioxide as working medium is characterized by comprising:

a first energy storage turbine (1);

the inlet of the second energy storage turbine (2) is communicated with the outlet of the first energy storage turbine (1);

the outlet of the second energy storage turbine (2) is communicated with the first inlet of the first energy storage heat exchanger (3);

the outlet of the first ice-water mixed storage tank (15) is communicated with the second inlet of the first energy storage heat exchanger (3) through a first pipeline; a fifth control valve (105) is arranged on the first pipeline;

the inlet of the second ice-water mixed storage tank (16) is communicated with the second outlet of the first energy storage heat exchanger (3);

the first outlet of the first energy storage heat exchanger (3) is communicated with the first inlet of the second energy storage heat exchanger (4);

a first outlet of the second energy storage heat exchanger (4) is communicated with an inlet of the low-pressure carbon dioxide storage tank (14) through a second pipeline; a fourth control valve (104) is arranged on the second pipeline;

the inlet of the first energy storage compressor (5) is communicated with the first outlet of the second energy storage heat exchanger (4);

a first outlet of the first energy storage compressor (5) is communicated with a first inlet of the fourth energy storage heat exchanger (8) through a third pipeline, and a first outlet of the fourth energy storage heat exchanger (8) is communicated with an inlet of the second energy storage turbine (2); a first control valve (101) is arranged on the third pipeline;

the outlet of the first cryogenic storage tank (9) is communicated with the second inlet of the fourth energy storage heat exchanger (8) through a fourth pipeline; a second control valve (102) is arranged on the fourth pipeline;

the inlet of the first high-temperature storage tank (10) is communicated with the second outlet of the fourth energy storage heat exchanger (8);

the inlet of the second energy storage compressor (6) is communicated with the second outlet of the first energy storage compressor (5);

the outlet of the second energy storage compressor (6) is communicated with the first inlet of the third energy storage heat exchanger (7); a first outlet of the third energy storage heat exchanger (7) is communicated with a second inlet of the second energy storage heat exchanger (4), and a second outlet of the second energy storage heat exchanger (4) is communicated with an inlet of the first energy storage turbine (1);

a first outlet of the third energy storage heat exchanger (7) is communicated with an inlet of the high-pressure carbon dioxide storage tank (13) through a fifth pipeline; a third control valve (103) is arranged on the fifth pipeline;

an outlet of the second cryogenic storage tank (11) is communicated with a second inlet of the third energy storage heat exchanger (7) through a sixth pipeline; a sixth control valve (106) is arranged on the sixth pipeline;

an inlet of the second high-temperature storage tank (12) is communicated with a second outlet of the third energy storage heat exchanger (7);

a first energy release turbine (17);

a second energy release turbine (18), the inlet of the second energy release turbine (18) being in communication with the outlet of the first energy release turbine (17);

the outlet of the second energy release turbine (18) is communicated with the first inlet of the first energy release heat exchanger (19);

a second energy releasing heat exchanger (20), wherein a first outlet of the first energy releasing heat exchanger (19) is communicated with a first inlet of the second energy releasing heat exchanger (20); an outlet of the second ice water mixed storage tank (16) is communicated with a second inlet of the second energy-releasing heat exchanger (20) through a seventh pipeline, and a second outlet of the second energy-releasing heat exchanger (20) is communicated with the first ice water mixed storage tank (15); a thirteenth control valve (207) is arranged on the seventh pipeline;

the inlet of the first energy releasing compressor (21) is communicated with the first outlet of the second energy releasing heat exchanger (20);

the low-pressure carbon dioxide storage tank (14), the low-pressure carbon dioxide storage tank (14) is communicated with the inlet of the first energy release compressor (21) through an eighth pipeline; a twelfth control valve (206) is arranged on the eighth pipeline;

a fourth energy releasing heat exchanger (24), wherein a first outlet of the first energy releasing compressor (21) is communicated with a first inlet of the fourth energy releasing heat exchanger (24) through a ninth pipeline, and a first outlet of the fourth energy releasing heat exchanger (24) is communicated with an inlet of the second energy releasing turbine (18); a seventh control valve (201) is arranged on the ninth pipeline; an outlet of the first high-temperature storage tank (10) is communicated with a second inlet of a fourth energy release heat exchanger (24) through a tenth pipeline, and a second outlet of the fourth energy release heat exchanger (24) is communicated with an inlet of the first low-temperature storage tank (9); an eighth control valve (202) is arranged on the tenth pipeline;

a second energy-releasing compressor (22), wherein the inlet of the second energy-releasing compressor (22) is communicated with the second outlet of the first energy-releasing compressor (21); the outlet of the second energy-releasing compressor (22) is communicated with the second inlet of the first energy-releasing heat exchanger (19); the high-pressure carbon dioxide storage tank (13) is communicated with a second inlet of the first energy-releasing heat exchanger (19) through an eleventh pipeline; an eleventh control valve (205) is arranged on the eleventh pipeline;

the second outlet of the first energy releasing heat exchanger (19) is communicated with the first inlet of the third energy releasing heat exchanger (23); a first outlet of the third energy-releasing heat exchanger (23) is communicated with a first inlet of the first energy-releasing turbine (17) through a twelfth pipeline; a ninth control valve (203) is arranged on the twelfth pipeline;

an outlet of the second high-temperature storage tank (12) is communicated with a second inlet of a third energy-releasing heat exchanger (23) through a thirteenth pipeline, and a second outlet of the third energy-releasing heat exchanger (23) is communicated with an inlet of the second low-temperature storage tank (11); a fourteenth control valve (208) is arranged on the thirteenth pipeline;

an inlet of the external heat source (25) is communicated with a first outlet of the third energy-releasing heat exchanger (23) through a fourteenth pipeline, and an outlet of the external heat source (25) is communicated with an inlet of the first energy-releasing turbine (17); a tenth control valve (204) is arranged on the fourteenth pipeline.

9. The method for controlling the peak shaving energy storage device using the carbon dioxide as the working medium is characterized by comprising the following steps of:

when the user is in the power consumption low ebb, energy storage system carries out work, and seventh to fourteenth control valve close, only adjusts first to sixth control valve, includes: when the surplus power is less, opening the fifth control valve and the sixth control valve, and closing the first control valve, the second control valve and the fourth control valve;

when surplus power rises, opening the first control valve and the second control valve; the carbon dioxide heat exchanger is used for shunting the carbon dioxide flowing out of the first energy storage compressor to the fourth energy storage heat exchanger, transferring heat to the heat storage medium in the first low-temperature storage tank, and storing the heat in the first high-temperature storage tank to increase heat storage;

when the surplus power further rises, opening the third control valve and the fourth control valve; the high-pressure carbon dioxide storage tank is used for storing the cooled high-pressure carbon dioxide and low-pressure carbon dioxide to the high-pressure carbon dioxide storage tank and the low-pressure carbon dioxide storage tank for energy release.

10. The method for controlling the peak shaving energy storage device using the carbon dioxide as the working medium is characterized by comprising the following steps of:

when the user is in a power utilization peak, the energy release system works, the first control valve, the second control valve, the third control valve, the fourth control valve, the fifth control valve and the sixth control valve are closed, and only the seventh control valve, the fourteenth control valve and the fourteenth control valve are adjusted: when the demand of the user power is not high, opening the seventh control valve, the thirteenth control valve and the fourteenth control valve, and closing the eighth control valve to the twelfth control valve;

when the demand of the user power rises, opening the fifth control valve and the sixth control valve; the second energy release turbine is used for shunting the carbon dioxide flowing out of the first energy release compressor to the fourth energy release heat exchanger, absorbing the heat in the first high-temperature storage tank, entering the second energy release turbine for power generation and increasing the energy supply;

when the power demand of the user further rises, opening the ninth control valve and the tenth control valve; for increasing the supply of cycle energy using carbon dioxide stored in the high-pressure carbon dioxide storage tank and the low-pressure carbon dioxide storage tank;

when the power demand of the user further increases, closing the seventh control valve and opening the eighth control valve; the device is used for heating working media by utilizing an external heat source and increasing circulating energy supply.

Technical Field

The invention belongs to the technical field of peak-shaving energy storage devices and control thereof, and particularly relates to a peak-shaving energy storage device taking carbon dioxide as a working medium and a control method thereof.

Background

The traditional energy is increasingly deficient, the environmental protection pressure is getting more serious, new energy is more emphasized, the challenge is provided for the safe and stable operation of a power grid, and the energy storage technology can solve the problems of peak load shifting and valley load filling to a greater extent.

At present, the traditional energy storage technology comprises pumped storage, compressed air energy storage and electrochemical energy storage, wherein the pumped storage technology depends on specific geological conditions and needs enough water source; compressed air is used for storing energy, so that the energy storage efficiency is low and the energy density is low; electrochemical energy storage and the like have the limitations of scale and the like. The carbon dioxide has good stability and rich stock due to the relatively moderate critical pressure (7.38MPa, 31 ℃); compared with the common inert gas, the carbon dioxide gas has the advantage of high density in a supercritical state, and the size of equipment in a power cycle can be effectively reduced; has better stability and physical property, shows the property of inert gas in a certain temperature range, has the characteristics of no toxicity, rich reserves, natural existence and the like, and has great prospect when being applied to the field of energy storage.

However, the currently adopted energy storage system using carbon dioxide as a working medium has the problems that the energy storage scale is not flexible, a plurality of systems need to be arranged when the user demand changes, the cost is increased, and the like. For an electrothermal energy storage system (201610872927.3), because the components of an energy storage unit and an energy release unit of the system are single, the scales of energy storage and supply are fixed, the fluctuation range of the regulation by the flow is small, the flexibility is low, and the change of the user demand cannot be adapted.

Therefore, it is urgently needed to develop a peak-shaving energy storage device using carbon dioxide as a working medium and a control method thereof, so as to realize multi-level energy storage and release and flexibly perform peak shifting and valley filling.

Disclosure of Invention

The invention aims to provide a peak regulation energy storage device using carbon dioxide as a working medium and a control method thereof, which aim to solve the problems that the fluctuation range is small and the flexibility is low only by adjusting the flow rate, and the peak regulation energy storage device cannot adapt to the change of user requirements. The invention can realize multi-level energy storage and release and flexibly carry out peak shifting and valley filling.

In order to achieve the purpose, the invention adopts the following technical scheme:

the invention relates to a peak regulation energy storage device taking carbon dioxide as a working medium, which comprises: an energy storage system and an energy release system;

the energy storage system comprises a carbon dioxide energy storage circulation subsystem, a first energy storage subsystem and a second energy storage subsystem; the carbon dioxide energy storage and circulation subsystem comprises a first energy storage turbine, a second energy storage turbine, a first energy storage heat exchanger, a second energy storage heat exchanger, a first energy storage compressor, a second energy storage compressor, a third energy storage heat exchanger and a fourth energy storage heat exchanger and is used for realizing energy storage thermodynamic circulation of carbon dioxide; the first energy storage subsystem comprises a first energy storage heat exchanger, a third energy storage heat exchanger, a second low-temperature storage tank, a second high-temperature storage tank, a first ice-water mixed storage tank and a second ice-water mixed storage tank and is used for realizing basic energy storage of cold and heat; the second energy storage subsystem comprises a fourth energy storage heat exchanger, a first low-temperature storage tank, a first high-temperature storage tank, a high-pressure carbon dioxide storage tank and a low-pressure carbon dioxide storage tank and is used for realizing multi-stage storage of energy;

the energy release system comprises a carbon dioxide energy release circulation subsystem, a first energy release subsystem and a second energy release subsystem; the carbon dioxide energy release circulation subsystem comprises a first energy release turbine, a second energy release turbine, a first energy release heat exchanger, a second energy release heat exchanger, a first energy release compressor, a second energy release compressor, a third energy release heat exchanger, a fourth energy release heat exchanger and an external heat source and is used for realizing energy release thermodynamic circulation of carbon dioxide; the first energy release subsystem comprises a second energy release heat exchanger, a third energy release heat exchanger, a second low-temperature storage tank, a second high-temperature storage tank, a first ice-water mixed storage tank and a second ice-water mixed storage tank and is used for realizing basic energy release of cold and heat; the second energy release subsystem comprises a fourth energy release heat exchanger, an external heat source, a first low-temperature storage tank, a first high-temperature storage tank, a high-pressure carbon dioxide storage tank and a low-pressure carbon dioxide storage tank and is used for achieving multi-stage energy release.

A further improvement of the invention consists in that the energy storage system comprises in particular:

the inlet of the second energy storage turbine is communicated with the outlet of the first energy storage turbine; the outlet of the second energy storage turbine is communicated with the first inlet of the first energy storage heat exchanger; an outlet of the first ice-water mixed storage tank is communicated with a second inlet of the first energy storage heat exchanger through a first pipeline; an inlet of the second ice-water mixed storage tank is communicated with a second outlet of the first energy storage heat exchanger; the first outlet of the first energy storage heat exchanger is communicated with the first inlet of the second energy storage heat exchanger; a first outlet of the second energy storage heat exchanger is communicated with an inlet of the low-pressure carbon dioxide storage tank through a second pipeline; an inlet of the first energy storage compressor is communicated with a first outlet of the second energy storage heat exchanger; a first outlet of the first energy storage compressor is communicated with a first inlet of a fourth energy storage heat exchanger through a third pipeline, and a first outlet of the fourth energy storage heat exchanger is communicated with an inlet of a second energy storage turbine; an outlet of the first cryogenic storage tank is communicated with a second inlet of the fourth energy storage heat exchanger through a fourth pipeline; an inlet of the first high-temperature storage tank is communicated with a second outlet of the fourth energy storage heat exchanger; the inlet of the second energy storage compressor is communicated with the outlet of the first energy storage compressor; the outlet of the second energy storage compressor is communicated with the first inlet of the third energy storage heat exchanger; a first outlet of the third energy storage heat exchanger is communicated with a second inlet of the second energy storage heat exchanger, and a second outlet of the second energy storage heat exchanger is communicated with an inlet of the first energy storage turbine; a first outlet of the third energy storage heat exchanger is communicated with an inlet of the high-pressure carbon dioxide storage tank through a fifth pipeline; an outlet of the second low-temperature storage tank is communicated with a second inlet of the third energy storage heat exchanger through a sixth pipeline; and an inlet of the second high-temperature storage tank is communicated with a second outlet of the third energy storage heat exchanger.

The invention is further improved in that a fifth control valve is arranged on the first pipeline; a fourth control valve is arranged on the second pipeline; a first control valve is arranged on the third pipeline; a second control valve is arranged on the fourth pipeline; a third control valve is arranged on the fifth pipeline; and a sixth control valve is arranged on the sixth pipeline.

A further improvement of the invention is that the energy release system comprises in particular:

the inlet of the second energy release turbine is communicated with the outlet of the first energy release turbine; the outlet of the second energy release turbine is communicated with the first inlet of the first energy release heat exchanger; a first outlet of the first energy-releasing heat exchanger is communicated with a first inlet of the second energy-releasing heat exchanger; an outlet of the second ice water mixed storage tank is communicated with a second inlet of the second energy-releasing heat exchanger through a seventh pipeline, and a second outlet of the second energy-releasing heat exchanger is communicated with the first ice water mixed storage tank; an inlet of the first energy releasing compressor is communicated with a first outlet of the second energy releasing heat exchanger; the low-pressure carbon dioxide storage tank is communicated with an inlet of the first energy release compressor through an eighth pipeline; a first outlet of the first energy releasing compressor is communicated with a first inlet of a fourth energy releasing heat exchanger through a ninth pipeline, and a first outlet of the fourth energy releasing heat exchanger is communicated with an inlet of a second energy releasing turbine; an outlet of the first high-temperature storage tank is communicated with a second inlet of the fourth energy-releasing heat exchanger through a tenth pipeline, and a second outlet of the fourth energy-releasing heat exchanger is communicated with an inlet of the first low-temperature storage tank; the inlet of the second energy-releasing compressor is communicated with the second outlet of the first energy-releasing compressor; the outlet of the second energy-releasing compressor is communicated with the second inlet of the first energy-releasing heat exchanger; the high-pressure carbon dioxide storage tank is communicated with a second inlet of the first energy-releasing heat exchanger through an eleventh pipeline; the second outlet of the first energy-releasing heat exchanger is communicated with the first inlet of the third energy-releasing heat exchanger; a first outlet of the third energy-releasing heat exchanger is communicated with a first inlet of the first energy-releasing turbine through a twelfth pipeline; an outlet of the second high-temperature storage tank is communicated with a second inlet of a third energy-releasing heat exchanger through a thirteenth pipeline, and a second outlet of the third energy-releasing heat exchanger is communicated with an inlet of the second low-temperature storage tank; and an inlet of the external heat source is communicated with a first outlet of the third energy-releasing heat exchanger through a fourteenth pipeline.

The invention is further improved in that a thirteenth control valve is arranged on the seventh pipeline; a twelfth control valve is arranged on the eighth pipeline; a seventh control valve is arranged on the ninth pipeline; an eighth control valve is arranged on the tenth pipeline; an eleventh control valve is arranged on the eleventh pipeline; a ninth control valve is arranged on the twelfth pipeline; a fourteenth control valve is arranged on the thirteenth pipeline; a tenth control valve is arranged on the fourteenth pipeline.

The invention is further improved in that the second energy storage turbine is coaxially connected with the first energy storage compressor and is externally connected with a motor; the first energy storage turbine is coaxially connected with the first energy storage compressor and externally connected with a motor.

The invention is further improved in that the first energy release compressor is coaxially connected with the second energy release turbine and externally connected with a generator; the second energy releasing compressor is coaxially connected with the first energy releasing turbine and externally connected with a generator.

The invention relates to a peak regulation energy storage device taking carbon dioxide as a working medium, which comprises:

a first energy storage turbine; the inlet of the second energy storage turbine is communicated with the outlet of the first energy storage turbine; the outlet of the second energy storage turbine is communicated with the first inlet of the first energy storage heat exchanger; the outlet of the first ice-water mixed storage tank is communicated with the second inlet of the first energy storage heat exchanger through a first pipeline; a fifth control valve is arranged on the first pipeline; an inlet of the second ice-water mixed storage tank is communicated with a second outlet of the first energy storage heat exchanger; the first outlet of the first energy storage heat exchanger is communicated with the first inlet of the second energy storage heat exchanger; a first outlet of the second energy storage heat exchanger is communicated with an inlet of the low-pressure carbon dioxide storage tank through a second pipeline; a fourth control valve is arranged on the second pipeline; the inlet of the first energy storage compressor is communicated with the first outlet of the second energy storage heat exchanger; the first outlet of the first energy storage compressor is communicated with the first inlet of the fourth energy storage heat exchanger through a third pipeline, and the first outlet of the fourth energy storage heat exchanger is communicated with the inlet of the second energy storage turbine; a first control valve is arranged on the third pipeline; an outlet of the first cryogenic storage tank is communicated with a second inlet of the fourth energy storage heat exchanger through a fourth pipeline; a second control valve is arranged on the fourth pipeline; an inlet of the first high-temperature storage tank is communicated with a second outlet of the fourth energy storage heat exchanger; the inlet of the second energy storage compressor is communicated with the second outlet of the first energy storage compressor; the outlet of the second energy storage compressor is communicated with the first inlet of the third energy storage heat exchanger; a first outlet of the third energy storage heat exchanger is communicated with a second inlet of the second energy storage heat exchanger, and a second outlet of the second energy storage heat exchanger is communicated with an inlet of the first energy storage turbine; a first outlet of the third energy storage heat exchanger is communicated with an inlet of the high-pressure carbon dioxide storage tank through a fifth pipeline; a third control valve is arranged on the fifth pipeline; an outlet of the second cryogenic storage tank is communicated with a second inlet of the third energy storage heat exchanger through a sixth pipeline; a sixth control valve is arranged on the sixth pipeline; an inlet of the second high-temperature storage tank is communicated with a second outlet of the third energy storage heat exchanger; a first energy release turbine; the inlet of the second energy release turbine is communicated with the outlet of the first energy release turbine; the outlet of the second energy release turbine is communicated with the first inlet of the first energy release heat exchanger;

the first outlet of the first energy releasing heat exchanger is communicated with the first inlet of the second energy releasing heat exchanger; an outlet of the second ice water mixed storage tank is communicated with a second inlet of the second energy-releasing heat exchanger through a seventh pipeline, and a second outlet of the second energy-releasing heat exchanger is communicated with the first ice water mixed storage tank; a thirteenth control valve is arranged on the seventh pipeline;

the inlet of the first energy releasing compressor is communicated with the first outlet of the second energy releasing heat exchanger;

the low-pressure carbon dioxide storage tank is communicated with an inlet of the first energy release compressor through an eighth pipeline; a twelfth control valve is arranged on the eighth pipeline;

a first outlet of the first energy releasing compressor is communicated with a first inlet of the first energy releasing heat exchanger through a first pipeline; a seventh control valve is arranged on the ninth pipeline; an outlet of the first high-temperature storage tank is communicated with a second inlet of the fourth energy-releasing heat exchanger through a tenth pipeline, and a second outlet of the fourth energy-releasing heat exchanger is communicated with an inlet of the first low-temperature storage tank; an eighth control valve is arranged on the tenth pipeline;

the inlet of the second energy-releasing compressor is communicated with the second outlet of the first energy-releasing compressor; the outlet of the second energy-releasing compressor is communicated with the second inlet of the first energy-releasing heat exchanger; the high-pressure carbon dioxide storage tank is communicated with a second inlet of the first energy-releasing heat exchanger through an eleventh pipeline; an eleventh control valve is arranged on the eleventh pipeline;

the second outlet of the first energy-releasing heat exchanger is communicated with the first inlet of the third energy-releasing heat exchanger; a first outlet of the third energy-releasing heat exchanger is communicated with a first inlet of the first energy-releasing turbine through a twelfth pipeline; a ninth control valve is arranged on the twelfth pipeline; an outlet of the second high-temperature storage tank is communicated with a second inlet of a third energy-releasing heat exchanger through a thirteenth pipeline, and a second outlet of the third energy-releasing heat exchanger is communicated with an inlet of the second low-temperature storage tank; a fourteenth control valve is arranged on the thirteenth pipeline; an inlet of the external heat source is communicated with a first outlet of the third energy-releasing heat exchanger through a fourteenth pipeline, and an outlet of the external heat source is communicated with an inlet of the first energy-releasing turbine; a tenth control valve is arranged on the fourteenth pipeline.

The invention discloses a control method of a peak-shaving energy storage device taking carbon dioxide as a working medium, which comprises the following steps:

when the user is in the power consumption low ebb, energy storage system carries out work, and seventh to fourteenth control valve close, only adjusts first to sixth control valve, includes: when the surplus power is less, opening the fifth control valve and the sixth control valve, and closing the first control valve, the second control valve and the fourth control valve;

when surplus power rises, opening the first control valve and the second control valve; the carbon dioxide heat exchanger is used for shunting the carbon dioxide flowing out of the first energy storage compressor to the fourth energy storage heat exchanger, transferring heat to the heat storage medium in the first low-temperature storage tank, and storing the heat in the first high-temperature storage tank to increase heat storage;

when the surplus power further rises, opening the third control valve and the fourth control valve; the high-pressure carbon dioxide storage tank is used for storing the cooled high-pressure carbon dioxide and low-pressure carbon dioxide to the high-pressure carbon dioxide storage tank and the low-pressure carbon dioxide storage tank for energy release.

The invention discloses a control method of a peak-shaving energy storage device taking carbon dioxide as a working medium, which comprises the following steps:

when the user is in a power utilization peak, the energy release system works, the first control valve, the second control valve, the third control valve, the fourth control valve, the fifth control valve and the sixth control valve are closed, and only the seventh control valve, the fourteenth control valve and the fourteenth control valve are adjusted: when the demand of the user power is not high, opening the seventh control valve, the thirteenth control valve and the fourteenth control valve, and closing the eighth control valve to the twelfth control valve;

when the demand of the user power rises, opening the fifth control valve and the sixth control valve; the second energy release turbine is used for shunting the carbon dioxide flowing out of the first energy release compressor to the fourth energy release heat exchanger, absorbing the heat in the first high-temperature storage tank, entering the second energy release turbine for power generation and increasing the energy supply;

when the power demand of the user further rises, opening the ninth control valve and the tenth control valve; for increasing the supply of cycle energy using carbon dioxide stored in the high-pressure carbon dioxide storage tank and the low-pressure carbon dioxide storage tank;

when the power demand of the user further increases, closing the seventh control valve and opening the eighth control valve; the device is used for heating working media by utilizing an external heat source and increasing circulating energy supply.

Compared with the prior art, the invention has the following beneficial effects:

the invention can effectively realize peak load shifting of electric power and improve the flexibility and efficiency of energy utilization of users based on carbon dioxide energy storage and release circulation. The invention has simple and flexible application, is provided with a plurality of cold and heat and pressure storage tanks, can realize the energy storage and release functions of various grades, and can meet the energy storage application in a wider range. Specifically, the existing carbon dioxide energy storage technology can only depend on flow regulation, energy is stored and released in a gradient mode through variable working condition operation of components, the regulation range is small, and the damage to the components caused by long-time variable working condition operation is large.

According to the invention, the second energy storage turbine is coaxially connected with the first energy storage compressor and is simultaneously connected with the motor, and the first energy storage turbine is coaxially connected with the first energy storage compressor and is simultaneously connected with the motor so as to balance axial thrust and improve the compactness of the device.

In the invention, the first energy release compressor is coaxially connected with the second energy release turbine and is simultaneously connected with the generator, and the second energy release compressor is coaxially connected with the first energy release turbine and is simultaneously connected with the generator so as to balance axial thrust and improve the compactness of the device.

The control method can realize multi-level energy storage and release and flexibly carry out peak shifting and valley filling.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art are briefly introduced below; it is obvious that the drawings in the following description are some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

FIG. 1 is a schematic diagram of an energy storage portion of a peak shaving energy storage device using carbon dioxide as a working medium according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of an energy release part of a peak shaving energy storage device using carbon dioxide as a working medium according to an embodiment of the present invention;

in fig. 1 and 2, 1, a first energy storage turbine; 2. a second energy storage turbine; 3. a first energy storage heat exchanger; 4. a second energy storage heat exchanger; 5. a first energy storing compressor; 6. a second energy storing compressor; 7. a third energy storage heat exchanger; 8. a fourth energy storage heat exchanger; 9. a first cryogenic storage tank; 10. a first high temperature storage tank; 11. a second cryogenic storage tank; 12. a second high temperature storage tank; 13 a high pressure carbon dioxide storage tank; 14. a low pressure carbon dioxide storage tank; 15. a first ice-water mixed storage tank; 16. a second ice-water mixed storage tank; 17. a first energy release turbine; 18. a second energy release turbine; 19. a first energy releasing heat exchanger; 20. a second energy releasing heat exchanger; 21. a first energy releasing compressor; 22. a second energy releasing compressor; 23. a third energy releasing heat exchanger; 24. a fourth energy releasing heat exchanger; 25. an external heat source;

101. a first control valve; 102. a second control valve; 103. a third control valve; 104. a fourth control valve; 105. a fifth control valve; 106. a sixth control valve; 201. a seventh control valve; 202. an eighth control valve; 203. a ninth control valve; 204. a tenth control valve; 205. an eleventh control valve; 206. a twelfth control valve; 207. a thirteenth control valve; 208. a fourteenth control valve.

Detailed Description

In order to make the purpose, technical effect and technical solution of the embodiments of the present invention clearer, the following clearly and completely describes the technical solution of the embodiments of the present invention with reference to the drawings in the embodiments of the present invention; it is to be understood that the described embodiments are only some of the embodiments of the present invention. Other embodiments, which can be derived by one of ordinary skill in the art from the disclosed embodiments without inventive faculty, are intended to be within the scope of the invention.

The peak-shaving energy storage device with carbon dioxide as a working medium comprises an energy storage part and an energy release part.

Referring to fig. 1, the energy storage portion includes: the system comprises a first energy storage turbine 1, a second energy storage turbine 2, a first energy storage heat exchanger 3, a second energy storage heat exchanger 4, a first energy storage compressor 5, a second energy storage compressor 6, a third energy storage heat exchanger 7, a fourth energy storage heat exchanger 8, a first low-temperature storage tank 9, a first high-temperature storage tank 10, a second low-temperature storage tank 11, a second high-temperature storage tank 12, a high-pressure carbon dioxide storage tank 13, a low-pressure carbon dioxide storage tank 14, a first ice and water mixed storage tank 15, a second ice and water mixed storage tank 16, a first control valve 101, a second control valve 102, a third control valve 103, a fourth control valve 104, a fifth control valve 105 and a sixth control valve 106.

The first energy storage turbine 1 is connected with the second energy storage turbine 2 and then connected to a first inlet of the first energy storage heat exchanger 3, a first outlet of the first energy storage heat exchanger 3 is connected to a first inlet of the second energy storage heat exchanger 4, a first outlet of the second energy storage heat exchanger 4 is connected to the first energy storage compressor 5, the first energy storage compressor 5 is connected with the second energy storage compressor 6 and then connected to a first inlet of the third energy storage heat exchanger 7, a first outlet of the third energy storage heat exchanger 7 is connected to a second inlet of the second energy storage heat exchanger 4, and a second outlet of the second energy storage heat exchanger 4 is connected with the first energy storage turbine 1; the second low-temperature storage tank 11 is connected to a second inlet of the third energy-storage heat exchanger 7, and a second outlet of the third energy-storage heat exchanger 7 is connected to the second high-temperature storage tank 12, so that heat storage is realized; the ice-water mixed storage tank 15 is connected to a second inlet of the first energy storage heat exchanger 3, and a second outlet of the first energy storage heat exchanger 3 is connected to the ice-water mixed storage tank 16, so that cold storage is realized. The above components constitute a basic energy storage portion.

A first outlet of the second energy-storing heat exchanger 4 is connected to the low-pressure carbon dioxide storage tank 14 via a control valve 104; a first outlet of the third energy-storing heat exchanger 7 is connected to the high-pressure carbon dioxide storage tank 13 via a control valve 103 for increasing the energy-storing capacity.

The first energy storage compressor 5 is connected to a first inlet of the fourth energy storage heat exchanger 8 through a control valve 101 in a shunting manner, a first outlet of the fourth energy storage heat exchanger 8 is connected to the second energy storage turbine 2, the first low-temperature storage tank 9 is connected to a second inlet of the fourth energy storage heat exchanger 8 through a control valve 102, and a second outlet of the fourth energy storage heat exchanger 8 is connected with the first high-temperature storage tank 10 to improve the energy storage capacity.

The second energy storage turbine 2 is coaxially connected to the first energy storage compressor 5 and is also connected to the electric motor, and the first energy storage turbine 1 is coaxially connected to the first energy storage compressor 6 and is also connected to the electric motor, so as to balance the axial thrust and improve the compactness of the device.

Referring to fig. 2, the energy release portion includes: the system comprises a first low-temperature storage tank 9, a first high-temperature storage tank 10, a second low-temperature storage tank 11, a second high-temperature storage tank 12, a high-pressure carbon dioxide storage tank 13, a low-pressure carbon dioxide storage tank 14, a first ice-water mixed storage tank 15, a second ice-water mixed storage tank 16, a first energy release turbine 17, a second energy release turbine 18, a first energy release heat exchanger 19, a second energy release heat exchanger 20, a first energy release compressor 21, a second energy release compressor 22, a third energy release heat exchanger 23, a fourth energy release heat exchanger 24, an external heat source 25, a seventh control valve 201, an eighth control valve 202, a ninth control valve 203, a tenth control valve 204, an eleventh control valve 205, a twelfth control valve 206, a thirteenth control valve 207 and a fourteenth control valve 208.

The first energy releasing turbine 17 is connected with the second energy releasing turbine 18 and then connected to a first inlet of the first energy releasing heat exchanger 19, a first outlet of the first energy releasing heat exchanger 19 is connected to a first inlet of the second energy releasing heat exchanger 20, a first outlet of the second energy releasing heat exchanger 20 is connected to a first energy releasing compressor 21, the first energy releasing compressor 21 is connected with a second energy releasing compressor 22 and then connected to a second inlet of the first energy releasing heat exchanger 19, a second outlet of the first energy releasing heat exchanger 19 is connected to a first inlet of a third energy releasing heat exchanger 23, a second outlet of the third energy releasing heat exchanger 23 is connected with the first energy releasing turbine 17 through a control valve 203, and is simultaneously connected with an external heat source 25 through a control valve 204 and then connected with the first energy releasing turbine 17; the second high-temperature storage tank 12 is connected to a second inlet of the third energy releasing heat exchanger 23, and a second outlet of the third energy releasing heat exchanger 23 is connected to the second low-temperature storage tank 11 to realize heat storage; the ice-water mixing storage tank 16 is connected to a second inlet of the second energy-releasing heat exchanger 20, and a second outlet of the second energy-releasing heat exchanger 20 is connected to the ice-water mixing storage tank 15, so that cold storage is realized. The above components constitute a basic energy storage portion.

The high-pressure carbon dioxide storage tank 13 is connected to the second inlet of the first energy-releasing heat exchanger 19 via a control valve 205, and the low-pressure carbon dioxide storage tank 14 is connected to the first energy-releasing compressor 21 via a control valve 206 for increasing the energy-releasing capacity.

The first energy releasing compressor 21 is connected to a first inlet of a fourth energy releasing heat exchanger 24 through a control valve 201 in a branched manner, a first outlet of the fourth energy releasing heat exchanger 24 is connected to the second energy releasing turbine 18, the first high temperature storage tank 10 is connected to a second inlet of the fourth energy releasing heat exchanger 24 through a control valve 102, and a second outlet of the fourth energy releasing heat exchanger 24 is connected to the first low temperature storage tank 9 to improve the energy releasing capacity.

The first energy-releasing compressor 21 is coaxially connected to the second energy-releasing turbine 18 and is also connected to the generator, and the second energy-releasing compressor 22 is coaxially connected to the first energy-releasing turbine 17 and is also connected to the generator, so as to balance the axial thrust and improve the compactness of the device.

The control method of the peak-shaving energy storage device with carbon dioxide as the working medium comprises the following steps:

when a user is in a low valley of electricity, the energy storage part of the peak shaving energy storage device works, the seventh control valve, the fourteenth control valve and the sixth control valve are closed, and only the first control valve, the second control valve and the third control valve are adjusted: when the surplus power is small, the fifth control valve 105 and the sixth control valve 106 are opened, and the first to fourth control valves are closed; the carbon dioxide enters the first energy storage turbine 1 and the second energy storage turbine 2 to expand, enters the first energy storage heat exchanger 3 after expansion, absorbs heat of the first ice-water mixed storage tank 15, stores cold energy into the second ice-water mixed storage tank 16, enters the second energy storage heat exchanger 4 to absorb heat, enters the first energy storage compressor 5 and the second energy storage compressor 6 to complete carbon dioxide compression and temperature rise, enters the third energy storage heat exchanger 7 to transfer heat to a heat storage medium in the second low-temperature storage tank 11, stores the heat in the second high-temperature storage tank 12, and enters the first energy storage turbine 1 through the second energy storage heat exchanger 4 to complete circulation after cold and heat storage; in this case, the second turbo machine 2 and the first turbo machine 5 are coaxially driven by the electric motor, and the second turbo machine 6 and the first turbo machine 1 are coaxially driven by the electric motor.

When surplus electric power rises, the first control valve 101 and the second control valve 102 are opened, carbon dioxide flowing out of the first energy storage compressor 5 is shunted to the fourth energy storage heat exchanger 8, heat is transferred to the heat storage medium in the first low-temperature storage tank 9, and meanwhile, the heat is stored in the first high-temperature storage tank 10, and heat storage is increased.

When the surplus power further rises, the third control valve 103 and the fourth control valve 104 are opened, and the cooled high-pressure carbon dioxide and low-pressure carbon dioxide are stored in the high-pressure carbon dioxide storage tank 13 and the low-pressure carbon dioxide storage tank 14 for use in the energy release stage.

When a user is in a peak of electricity utilization, the energy releasing part of the peak shaving energy storage device works, the first control valve, the second control valve, the third control valve, the fourth control valve, the fifth control valve and the sixth control valve are closed, and only the seventh control valve, the fourteenth control valve and the sixth control valve are adjusted: when the power demand of a user is not high, a seventh control valve 203, a thirteenth control valve 207 and a fourteenth control valve 208 are opened, the eighth to twelfth control valves are closed, carbon dioxide enters a first energy release turbine 17 and a second energy release turbine 18 to expand, work and power generation are completed, energy output is realized, then the carbon dioxide flows through a first energy release heat exchanger 19 to provide heat, then enters a second energy release heat exchanger 20, is stored by a second ice-water mixed storage tank 16 to obtain cold energy for cooling, the cooled carbon dioxide enters a first energy release compressor 21 and a second energy release compressor 22 to complete compression, then enters the first energy release heat exchanger 19 to absorb heat, then enters a third energy release heat exchanger 23 to absorb heat in a second high-temperature storage tank 12, and enters the first energy release turbine 17 to complete circulation after the temperature is raised; at this time, the second energy release turbine 18 and the first energy release compressor 21 are coaxial and drive the generator to generate electricity, and the first energy release turbine 17 and the second energy release compressor 22 are coaxial and drive the generator to generate electricity.

When the power demand of the user rises, the fifth control valve 201 and the sixth control valve 202 are opened, the carbon dioxide flowing out of the first energy release compressor 21 is branched to the fourth energy release heat exchanger 24, and the heat in the first high-temperature storage tank 10 is absorbed and enters the second energy release turbine 18 to generate power, so that the energy supply is increased.

When the consumer demand for electricity further rises, the ninth control valve 205 and the tenth control valve 206 are opened to increase the circulation energy supply using the carbon dioxide stored in the high-pressure carbon dioxide storage tank 13 and the low-pressure carbon dioxide storage tank 14.

When the user demand further increases, the seventh control valve 203 can be closed, the eighth control valve 204 can be opened, the working medium is heated by the external heat source 25, and the circulating energy supply is increased.

And when the user's electric power demand is not big, each heat storage jar and cold volume storage jar also can directly take and use work such as heating, cooling.

The method of the invention can realize that: the energy storage device absorbs off-peak power during the off-peak period of power utilization, stores energy and releases energy during the on-peak period of power utilization, so that peak shifting and valley filling of power are realized, the power cost of a user can be well reduced, and the capacity of the user for receiving intermittent energy is improved. The concrete advantages include: (1) the device based on the invention can realize energy storage in the electricity utilization valley, has flexible storage capacity and can be changed according to the actual condition; (2) the device can realize energy release during peak electricity utilization, has flexible energy supply capacity use, and can be adjusted according to user requirements; (3) the device and the control method thereof can better realize energy storage and release, are less limited by terrain and the like, have small size and flexible arrangement of carbon dioxide circulating parts, and ensure the adaptability of the device. In summary, the invention provides a peak regulation energy storage device using carbon dioxide as a working medium and a control method thereof, which can realize energy storage and energy release for users and reduce the power cost for users.

Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can make modifications and equivalents to the embodiments of the present invention without departing from the spirit and scope of the present invention, which is set forth in the claims of the present application.