Data center combined cooling and power system based on low-temperature liquid medium energy storage

Abstract

The present application relates to a data center combined cooling and power supply system based on low-temperature liquid medium energy storage, and relates to the field of renewable energy consumption technology. The system comprises a renewable energy power generation system, a liquefied natural gas receiving station, a liquefied air energy storage subsystem, a liquefied hydrogen energy storage subsystem, a liquefied air energy release subsystem, a liquefied hydrogen energy release subsystem and a data center refrigerant circulation subsystem. The liquefied air energy release subsystem comprises an expansion generator, the liquefied hydrogen energy release subsystem comprises a fuel cell, and the data center comprises a data center cold energy load and a data center electric energy load. The cold energy released by the liquefied natural gas, the electric energy generated by the renewable energy and the cold energy and electric energy load required by the data center are optimally matched, and appropriate energy management strategies are selected according to different working conditions, so that the comprehensive utilization efficiency of the liquefied natural gas and the renewable energy can be improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of renewable energy consumption, and particularly relates to a data center combined cooling and power supply system based on low-temperature liquid medium energy storage. BACKGROUND

[0002] The liquefied natural gas receiving station in the coastal area needs to gasify the low-temperature liquefied natural gas medium into normal-temperature gaseous natural gas, and then deliver the gaseous natural gas to the user area through the natural gas pipeline. In the regasification process, the liquefied natural gas will release about 830 kJ / kg of cold energy. Due to the instability of gas consumption, the cold energy released by the natural gas vaporization is also unstable, which further leads to the difficulty in recycling the cold energy of the natural gas. The power generation of renewable energy such as photovoltaic and wind power in the coastal area is increasing, but due to the instability of renewable energy generation and the limited on-grid capacity of external power transmission, a large-capacity energy storage device is urgently needed for stable regulation and control of electric energy.

[0003] The high-density integration of server equipment in the data center machine room generates a large amount of heat accumulation in the daily operation process, resulting in a large amount of electric energy consumed by the data center refrigeration operation. According to statistics, the power consumption of the data center refrigeration system accounts for 30%-50%, and energy saving is urgently needed. Utilizing the gasification cold energy of liquefied natural gas is one of the effective solutions to effectively reduce the energy consumption of the data center refrigeration system. However, how to match the smooth cold energy and power supply required by the data center with the fluctuating cold energy and power output provided by the liquefied natural gas and renewable energy is a major problem that limits the efficient use of liquefied natural gas resources and renewable energy in the coastal area.

[0004] Therefore, at the present stage, a data center combined cooling and power supply system based on low-temperature liquid medium energy storage needs to be designed to solve the above problems. SUMMARY

[0005] The application aims to provide a data center combined cooling and power supply system based on low-temperature liquid medium energy storage, which solves the technical problems existing in the prior art, that is, how to match the smooth cold energy and power supply required by the data center with the fluctuating cold energy and power output provided by the liquefied natural gas and renewable energy, which is a major problem that limits the efficient use of liquefied natural gas resources and renewable energy in the coastal area.

[0006] To achieve the above-mentioned purpose, the technical scheme of the application is:

[0007] The application discloses a data center combined cooling and power supply system based on low-temperature liquid medium energy storage, which comprises a renewable energy power generation system, a liquefied natural gas receiving station, a liquefied air energy storage subsystem, a liquefied hydrogen energy storage subsystem, a liquefied air energy release subsystem, a liquefied hydrogen energy release subsystem and a data center refrigerant circulation subsystem, wherein the liquefied air energy release subsystem comprises an expansion generator, the liquefied hydrogen energy release subsystem comprises a fuel cell, and the data center comprises a data center cold energy load and a data center electric energy load.

[0008] The data center refrigerant circulation subsystem is installed on the data center cold energy load, and is used for cooling the data center cold energy load.

[0009] The renewable energy power generation system is connected to the data center electric energy load, and is used for providing normal electric energy supply for the data center electric energy load.

[0010] The liquefied natural gas receiving station is connected to the data center cold energy load, and is used for providing normal cold energy supply for the data center cold energy load.

[0011] The liquefied hydrogen energy storage subsystem is connected to the renewable energy power generation system and the liquefied natural gas receiving station, and is used for absorbing surplus electric energy of the renewable energy power generation system and surplus cold energy of the liquefied natural gas receiving station.

[0012] The liquefied air energy storage subsystem is connected to the renewable energy power generation system and the liquefied natural gas receiving station, and is used for absorbing surplus electric energy of the renewable energy power generation system and surplus cold energy of the liquefied natural gas receiving station.

[0013] The liquefied hydrogen energy release subsystem, the fuel cell and the data center electric energy load are sequentially connected, the liquefied hydrogen energy release subsystem provides emergency electric energy supply for the data center electric energy load through the fuel cell.

[0014] The liquefied air energy release subsystem, the expansion generator and the data center electric energy load are sequentially connected, the liquefied air energy release subsystem provides emergency electric energy supply for the data center electric energy load through the expansion generator, and the liquefied air energy release subsystem provides emergency cold energy supply for the data center cold energy load through the data center refrigerant circulation subsystem.

[0015] The liquefied air energy release subsystem and the liquefied hydrogen energy release subsystem provide emergency cold energy supply for the data center cold energy load through the data center refrigerant circulation subsystem, and the liquefied hydrogen energy release subsystem provides emergency cold energy supply for the data center cold energy load through the data center refrigerant circulation subsystem.

[0016] In an optional embodiment, the data center refrigerant circulation subsystem comprises a circulation pump, wherein the circulation pump, the first heat exchange channel of the first heat exchanger, the first heat exchange channel of the second heat exchanger, the first heat exchange channel of the third heat exchanger, and the data center are sequentially and end-to-end connected to form a refrigerant circulation loop, and the refrigerant circulation loop circulates refrigerant.

[0017] In an optional embodiment, the liquefied air energy storage subsystem comprises a first compressor, a first pressure reducing valve, and a liquefied air storage tank, wherein the first heat exchange channel of the fourth heat exchanger, the first compressor, the first heat exchange channel of the fifth heat exchanger, the first pressure reducing valve, and the liquefied air storage tank are sequentially connected.

[0018] In an optional embodiment, the liquefied air energy storage subsystem further comprises a cryogenic pump, wherein the liquefied air storage tank, the cryogenic pump, the second heat exchange channel of the first heat exchanger, and the expansion generator are sequentially connected, and the liquefied air storage tank is further connected to the first heat exchange channel of the seventh heat exchanger.

[0019] In an optional embodiment, the liquefied hydrogen energy storage subsystem comprises an electrolytic cell, a second compressor, a second pressure reducing valve, and a liquefied hydrogen storage tank, wherein the electrolytic cell, the first heat exchange channel of the sixth heat exchanger, the second compressor, the second heat exchange channel of the seventh heat exchanger, the second pressure reducing valve, the liquefied hydrogen storage tank, the second heat exchange channel of the second heat exchanger, and the fuel cell are sequentially connected.

[0020] In an optional embodiment, the liquefied natural gas receiving station comprises five output ports; wherein the first output port is connected to the inlet of the second channel of the third heat exchanger, the second output port is connected to the inlet of the second channel of the fourth heat exchanger, the third output port is connected to the inlet of the second channel of the fifth heat exchanger, the fourth output port is connected to the inlet of the second channel of the sixth heat exchanger, and the fifth output port is connected to the inlet of the third channel of the seventh heat exchanger.

[0021] In an optional embodiment, the output electric energy of the renewable energy power generation system, the expansion generator, and the fuel cell is collected to a power supply bus, the power supply bus is connected to the data center, the electrolytic cell, the first compressor, the second compressor, the circulation pump, and the cryogenic pump, and the power supply bus provides electric energy supply.

[0022] In an optional embodiment, the system further comprises a controller for executing the system energy management method, the method comprising the following steps:

[0023] The ratio R1 between the electric energy power output by the renewable energy power generation system and the electric energy load power of the data center, and the ratio R2 between the cold energy power output by the liquefied natural gas receiving station and the cold energy load power of the data center are collected;

[0024] In the case of R1 < 1 and R2 >= 1, the excess cold energy power is input to the liquefied air energy storage subsystem to store the liquefied air for standby, and the insufficient electric energy power is compensated to the rated power by the liquefied hydrogen energy release subsystem consuming the liquefied hydrogen;

[0025] In the case of R1 >= 1 and R2 < 1, the excess electric energy power is input to the liquefied hydrogen energy storage subsystem to store the liquefied hydrogen for standby, and the insufficient cold energy power is compensated to the rated power by the liquefied air energy release subsystem consuming the liquefied air.

[0026] In an optional embodiment, the method further comprises the following steps:

[0027] In the case of R1 >= 1, R2 >= 1 and R1 >= R2, the excess electric energy power and the excess cold energy power are input to the liquefied hydrogen energy storage subsystem to store the liquefied hydrogen for standby;

[0028] In the case of R1 >= 1, R2 >= 1 and R1 < R2, the excess electric energy power and the excess cold energy power are input to the liquefied air energy storage subsystem to store the liquefied air for standby;

[0029] In the case of R1 < 1, R2 < 1 and R1 < R2, the liquefied hydrogen energy release subsystem is controlled to consume the liquefied hydrogen to compensate for the insufficient electric energy power and the insufficient cold energy power.

[0030] In the case of R1 < 1, R2 < 1 and R1 >= R2, the liquefied air energy release subsystem is controlled to consume the liquefied air to compensate for the insufficient electric energy power and the insufficient cold energy power.

[0031] Compared with the prior art, the application has the beneficial effects that:

[0032] One of the beneficial effects of the present application is that 1, the cold energy of liquefied natural gas can be directly used for cooling in a data center, which can greatly reduce the energy consumption of refrigeration;

[0033] 2, in the liquefied hydrogen energy storage process, a part of the liquefied air is used to pre-cool the hydrogen, which can effectively improve the liquefaction rate of the hydrogen and reduce the energy consumption of the hydrogen liquefaction process;

[0034] 3, the cold energy released by liquefied natural gas and the electric energy generated by renewable energy are optimized and matched with the cold energy and electric energy load required by the data center, and appropriate energy management strategies are selected according to different working conditions, which can improve the comprehensive utilization efficiency of liquefied natural gas and renewable energy. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 The composition block diagram of the data center cold and power cogeneration system based on low-temperature liquid medium energy storage provided by the embodiment of the application.

[0036] Figure 2 Schematic diagram of data center cold energy supply.

[0037] Figure 3 Schematic diagram of data center electric energy supply.

[0038] Figure 4 Flow chart of system energy management method. DETAILED DESCRIPTION

[0039] For the purpose of the present application, the technical solutions and advantages are more clear and explicit, the following will be combined with the drawings and examples, the present application is further detailed. It should be understood that the specific examples described herein are only used to explain the present application, and are not used to limit the present application, that is, the described examples are only a part of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application. It should be noted that the relationship terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations.

[0041] Moreover, the term "comprising", "containing" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent in such process, method, article or device. Without more limitations, the element defined by the sentence "including a…" does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0042] Please refer to Figure 1 The embodiment provides a data center combined cooling and power supply system based on low-temperature liquid medium energy storage (hereinafter referred to as system).

[0043] The system comprises a renewable energy power generation system, a liquefied natural gas receiving station, a liquefied air energy storage subsystem, a liquefied hydrogen energy storage subsystem, a liquefied air release subsystem, a liquefied hydrogen release subsystem and a data center refrigerant circulation subsystem, wherein the liquefied air release subsystem comprises an expansion generator, the liquefied hydrogen release subsystem comprises a fuel cell, and the data center comprises a data center cold energy load and a data center electric energy load.

[0044] The data center refrigerant circulation subsystem is installed at the data center cold energy load, and the data center refrigerant circulation subsystem is used for cooling the data center cold energy load.

[0045] The renewable energy power generation system is connected to the data center electric energy load, and the renewable energy power generation system is used for providing normal electric energy supply for the data center electric energy load.

[0046] The liquefied natural gas receiving station is connected to the data center cold energy load, and the liquefied natural gas receiving station is used for providing normal cold energy supply for the data center cold energy load.

[0047] The liquefied hydrogen energy storage subsystem is connected to the renewable energy power generation system and the liquefied natural gas receiving station, and the liquefied hydrogen energy storage subsystem is used for absorbing surplus electric energy of the renewable energy power generation system and surplus cold energy of the liquefied natural gas receiving station.

[0048] The liquefied air energy storage subsystem is connected to the renewable energy power generation system and the liquefied natural gas receiving station, and the liquefied air energy storage subsystem is used for absorbing surplus electric energy of the renewable energy power generation system and surplus cold energy of the liquefied natural gas receiving station.

[0049] The liquefied hydrogen release subsystem, the fuel cell and the data center electric energy load are connected in sequence, and the liquefied hydrogen release subsystem provides emergency electric energy supply for the data center electric energy load through the fuel cell.

[0050] The liquefied air release subsystem, the expansion generator and the data center electric energy load are connected in sequence, and the liquefied air release subsystem provides emergency electric energy supply for the data center electric energy load through the expansion generator; and the liquefied air release subsystem provides emergency cold energy supply for the data center cold energy load through the data center refrigerant circulation subsystem.

[0051] The liquefied air release subsystem and the liquefied hydrogen release subsystem provide emergency cold energy supply for the data center cold energy load through the data center refrigerant circulation subsystem. The liquefied hydrogen release subsystem provides emergency cold energy supply for the data center cold energy load through the data center refrigerant circulation subsystem.

[0052] Please refer to Figure 2 , the system further comprises a first heat exchanger, a second heat exchanger, a third heat exchanger, a fourth heat exchanger, a fifth heat exchanger, a sixth heat exchanger and a seventh heat exchanger.

[0053] The data center refrigerant circulation subsystem comprises a circulation pump, wherein the circulation pump, the first heat exchange channel of the first heat exchanger, the first heat exchange channel of the second heat exchanger, the first heat exchange channel of the third heat exchanger and the data center are sequentially and circularly connected to form a refrigerant circulation loop, and the refrigerant circulation loop circulates refrigerant.

[0054] Specifically, the high-temperature refrigerant output by the data center is connected to the inlet of the circulation pump, and after being pressurized by the circulation pump, the high-temperature refrigerant is connected to the inlet of the first heat exchange channel of the first heat exchanger through the outlet of the circulation pump. The outlet of the first heat exchange channel of the first heat exchanger is connected to the inlet of the first heat exchange channel of the second heat exchanger, and the outlet of the first heat exchange channel of the second heat exchanger is connected to the inlet of the first heat exchange channel of the third heat exchanger. After the high-temperature refrigerant is subjected to three-stage heat exchange operation of the first heat exchanger, the second heat exchanger and the third heat exchanger, the low-temperature refrigerant is output from the outlet of the first heat exchange channel of the third heat exchanger to the data center, thereby forming a refrigerant circulation loop and providing continuous cold energy supply for the data center.

[0055] The liquefied air energy storage subsystem comprises a first compressor, a first pressure reducing valve and a liquefied air storage tank. The first heat exchange channel of the fourth heat exchanger, the first compressor, the first heat exchange channel of the fifth heat exchanger, the first pressure reducing valve and the liquefied air storage tank are sequentially connected.

[0056] Specifically, the normal-temperature and normal-pressure air from the outside is connected to the inlet of the first heat exchange channel of the fourth heat exchanger. The outlet of the first heat exchange channel of the fourth heat exchanger is connected to the inlet of the first compressor. The outlet of the first compressor is connected to the inlet of the first heat exchange channel of the fifth heat exchanger. After the normal-temperature and normal-pressure air is subjected to three-stage operation of heat exchange, pressurization and heat exchange of the fourth heat exchanger, the first compressor and the fifth heat exchanger, the low-temperature and high-pressure air is output from the first heat exchange channel of the fifth heat exchanger and connected to the inlet of the first pressure reducing valve. After the low-temperature and high-pressure air is subjected to pressure reduction operation of the first pressure reducing valve, the low-temperature and normal-pressure liquefied air is generated and output from the outlet of the first pressure reducing valve to the liquefied air storage tank for storage.

[0057] The liquefied air energy release subsystem further comprises a low-temperature pump. The liquefied air storage tank, the low-temperature pump, the second heat exchange channel of the first heat exchanger and the expansion generator are sequentially connected. The liquefied air storage tank is further connected to the first heat exchange channel of the seventh heat exchanger.

[0058] Specifically, the liquefied air storage tank comprises two outlets. One of the two outlets is connected to the inlet of the low-temperature pump. After being pressurized by the low-temperature pump, the outlet of the low-temperature pump is connected to the inlet of the second heat exchange channel of the first heat exchanger. After the high-pressure and low-temperature liquefied air output by the low-temperature pump exchanges heat with the high-temperature refrigerant in the first heat exchange channel of the first heat exchanger, the high-pressure and low-temperature liquefied air becomes high-pressure and normal-temperature air and is input to the expansion generator for power generation operation.

[0059] Another outlet of the liquefied air storage tank is connected with an inlet of the first heat exchange channel of the seventh heat exchanger, and the normal-pressure low-temperature liquefied air output by the liquefied air storage tank is changed into normal-temperature air output to the external environment after heat exchange with the high-pressure normal-temperature hydrogen in the first heat exchange channel of the seventh heat exchanger.

[0060] The liquefied hydrogen storage subsystem includes an electrolytic cell, a second compressor, a second pressure-reducing valve and a liquefied hydrogen storage tank. The electrolytic cell, the first heat exchange channel of the sixth heat exchanger, the second compressor, the second heat exchange channel of the seventh heat exchanger, the second pressure-reducing valve, the liquefied hydrogen storage tank, the second heat exchange channel of the second heat exchanger and the fuel cell are connected in sequence.

[0061] Specifically, an outlet of the liquefied hydrogen storage tank is connected with an inlet of the second heat exchange channel of the second heat exchanger, and the low-temperature liquefied hydrogen output by the liquefied hydrogen storage tank is changed into normal-temperature hydrogen input to the fuel cell for power generation operation after heat exchange with the high-temperature coolant in the first heat exchange channel of the second heat exchanger.

[0062] The liquefied natural gas receiving station includes five output ports; the first output port is connected with an inlet of the second channel of the third heat exchanger, the second output port is connected with an inlet of the second channel of the fourth heat exchanger, the third output port is connected with an inlet of the second channel of the fifth heat exchanger, the fourth output port is connected with an inlet of the second channel of the sixth heat exchanger, and the fifth output port is connected with an inlet of the third channel of the seventh heat exchanger. In this way, the low-temperature liquefied natural gas output by the liquefied natural gas receiving station is changed into normal-temperature natural gas output to the natural gas pipeline of the external environment after heat exchange with the media in the remaining heat exchange channels of the third heat exchanger, the fourth heat exchanger, the fifth heat exchanger, the sixth heat exchanger and the seventh heat exchanger.

[0063] Please refer to Figure 3 The output electric energy of the renewable energy power generation system, the expansion generator and the fuel cell is collected to a power supply bus, the power supply bus is connected with the data center, the electrolytic cell, the first compressor, the second compressor, the circulating pump and the low-temperature pump, and the power supply bus provides stable electric energy supply.

[0064] Please refer to Figure 4 The system further includes a controller (not shown in the figure), which is used to execute the system energy management method, and the method includes the following steps:

[0065] S1: Collecting a ratio R1 between the electric energy power output by the renewable energy power generation system and the electric energy load power of the data center and a ratio R2 between the cold energy power output by the liquefied natural gas receiving station and the cold energy load power of the data center.

[0066] S2: Judging whether R1≥1.

[0067] In the case of R1≥1, S3 is executed.

[0068] S3: determine whether R2≥1.

[0069] In the case of R2≥1, S4 is executed.

[0070] S4: determine whether R1≥R2.

[0071] In the case of R1≥R2, S5 is executed.

[0072] S5: input the excess electric energy power and cold energy power to the liquefied hydrogen energy storage subsystem for preparing liquefied hydrogen storage standby. That is, the execution condition of S5 is: R1≥1, R2≥1 and R1≥R2.

[0073] In the case of R1<R2, S6 is executed.

[0074] S6: input the excess electric energy power and cold energy power to the liquefied air energy storage subsystem for preparing liquefied air storage standby. That is, the execution condition of S6 is: R1≥1, R2≥1 and R1<R2.

[0075] In the case of R1<1 in the determination result of S2, S7 is executed.

[0076] S7: determine whether R2≥1.

[0077] In the case of R2≥1, S8 is executed.

[0078] S8: input the excess cold energy power to the liquefied air energy storage subsystem for preparing liquefied air; and the insufficient electric energy power is compensated to the rated power by the liquefied hydrogen energy release subsystem consuming liquefied hydrogen. That is, the execution condition of S8 is: R1<1 and R2≥1.

[0079] In the case of R2<1 in the determination result of S7, S9 is executed.

[0080] S9: determine whether R1≥R2.

[0081] In the case of R1≥R2, S10 is executed.

[0082] S10: control the liquefied air energy release subsystem to consume liquefied air for compensating the insufficient electric energy power and cold energy power. That is, the execution condition of S10 is: R1<1, R2<1 and R1≥R2.

[0083] In the case of R1<R2, S11 is executed.

[0084] S11: control the liquefied hydrogen energy release subsystem to consume liquefied hydrogen for compensating the insufficient electric energy power and cold energy power. That is, the execution condition of S11 is: R1<1, R2<1 and R1<R2.

[0085] In the result of the judgment of S3, in the case of R2<1, S12 is executed.

[0086] S12: the excess electric energy power is input to the liquefied hydrogen energy storage subsystem to prepare liquefied hydrogen storage for standby, and the insufficient cold energy power is compensated to the rated power by the liquefied air energy release subsystem. That is, the execution condition of S12 is: R1≥1 and R2<1.

[0087] The above is the preferred embodiment of the present application, any change made according to the technical solution of the present application, as long as the function generated does not exceed the scope of the technical solution of the present application, belongs to the protection scope of the present application.

Claims

1. A data center combined cooling and power system based on low-temperature liquid medium energy storage, characterized in that, The system comprises a renewable energy power generation system, a liquefied natural gas receiving station, a liquefied air energy storage subsystem, a liquefied hydrogen energy storage subsystem, a liquefied air release subsystem, a liquefied hydrogen release subsystem and a data center refrigerant circulation subsystem, wherein the liquefied air release subsystem comprises an expansion generator, the liquefied hydrogen release subsystem comprises a fuel cell, and the data center comprises a data center cold energy load and a data center electric energy load; The data center refrigerant circulation subsystem is connected to the data center cold energy load and is used for cooling the data center cold energy load; The renewable energy power generation system is connected to the data center electric energy load and is used for providing normal electric energy supply for the data center electric energy load; The liquefied natural gas receiving station is connected to the data center cold energy load and is used for providing normal cold energy supply for the data center cold energy load; The liquefied hydrogen energy storage subsystem is connected to the renewable energy power generation system and the liquefied natural gas receiving station and is used for absorbing surplus electric energy of the renewable energy power generation system and surplus cold energy of the liquefied natural gas receiving station; The liquefied air energy storage subsystem is connected to the renewable energy power generation system and the liquefied natural gas receiving station and is used for absorbing surplus electric energy of the renewable energy power generation system and surplus cold energy of the liquefied natural gas receiving station; The liquefied hydrogen release subsystem, the fuel cell and the data center electric energy load are sequentially connected, and the liquefied hydrogen release subsystem provides emergency electric energy supply for the data center electric energy load through the fuel cell; The liquefied air release subsystem, the expansion generator and the data center electric energy load are sequentially connected, and the liquefied air release subsystem provides emergency electric energy supply for the data center electric energy load through the expansion generator; the liquefied air release subsystem provides emergency cold energy supply for the data center cold energy load through the data center refrigerant circulation subsystem; The liquefied air release subsystem and the liquefied hydrogen release subsystem provide emergency cold energy supply for the data center cold energy load through the data center refrigerant circulation subsystem; the liquefied hydrogen release subsystem provides emergency cold energy supply for the data center cold energy load through the data center refrigerant circulation subsystem; The system further comprises a controller used for executing a system energy management method, and the system energy management method comprises the following steps: Collecting a ratio R1 between electric energy power output by the renewable energy power generation system and data center electric energy load power and a ratio R2 between cold energy power output by the liquefied natural gas receiving station and data center cold energy load power; In the case of R1 < 1 and R2 ≥ 1, surplus cold energy power is input to the liquefied air energy storage subsystem for storage and preparation of liquefied air; and insufficient electric energy power is compensated to rated power by the liquefied hydrogen release subsystem consuming liquefied hydrogen; In the case of R1≥1 and R2<1, the excess electric energy power is input to the liquefied hydrogen energy storage subsystem to prepare liquefied hydrogen storage for standby, and the insufficient cold energy power is compensated to the rated power by the liquefied air energy release subsystem consuming liquefied air; The system energy management method further comprises the following steps: In the case of R1≥1, R2≥1 and R1≥R2, the excess electric energy power and the excess cold energy power are input to the liquefied hydrogen energy storage subsystem to prepare liquefied hydrogen storage for standby; In the case of R1≥1, R2≥1 and R1<R2, the excess electric energy power and the excess cold energy power are input to the liquefied air energy storage subsystem to prepare liquefied air storage for standby; In the case of R1<1, R2<1 and R1<R2, the liquefied hydrogen energy release subsystem is controlled to consume liquefied hydrogen to compensate for the insufficient electric energy power and the insufficient cold energy power; In the case of R1<1, R2<1 and R1≥R2, the liquefied air energy release subsystem is controlled to consume liquefied air to compensate for the insufficient electric energy power and the insufficient cold energy power.

2. The cryogenic liquid medium based energy storage data center CCHP system of claim 1, wherein, The data center refrigerant circulation subsystem comprises a circulation pump, wherein the circulation pump, the first heat exchange channel of the first heat exchanger, the first heat exchange channel of the second heat exchanger, the first heat exchange channel of the third heat exchanger and the data center are sequentially and circularly connected to form a refrigerant circulation loop, and the refrigerant circulation loop circulates refrigerant.

3. The cryogenic liquid medium based energy storage data center CCHP system of claim 2, wherein, The liquefied air energy storage subsystem comprises a first compressor, a first pressure reducing valve and a liquefied air storage tank, wherein the first heat exchange channel of the fourth heat exchanger, the first compressor, the first heat exchange channel of the fifth heat exchanger, the first pressure reducing valve and the liquefied air storage tank are sequentially connected.

4. The cryogenic liquid medium based energy storage data center CCHP system of claim 3, wherein, The liquefied air energy release subsystem further comprises a cryogenic pump, wherein the liquefied air storage tank, the cryogenic pump, the second heat exchange channel of the first heat exchanger and the expansion generator are sequentially connected, and the liquefied air storage tank is further connected to the first heat exchange channel of the seventh heat exchanger.

5. The cryogenic liquid medium based energy storage data center CCHP system of claim 4, wherein, The liquefied hydrogen energy storage subsystem comprises an electrolytic cell, a second compressor, a second pressure reducing valve and a liquefied hydrogen storage tank, wherein the electrolytic cell, the first heat exchange channel of the sixth heat exchanger, the second compressor, the second heat exchange channel of the seventh heat exchanger, the second pressure reducing valve, the liquefied hydrogen storage tank, the second heat exchange channel of the second heat exchanger and the fuel cell are sequentially connected.

6. The cryogenic liquid medium based energy storage data center CCHP system of claim 5, wherein, The liquefied natural gas receiving station comprises five output ports; wherein the first output port is connected to the inlet of the second channel of the third heat exchanger, the second output port is connected to the inlet of the second channel of the fourth heat exchanger, the third output port is connected to the inlet of the second channel of the fifth heat exchanger, the fourth output port is connected to the inlet of the second channel of the sixth heat exchanger, and the fifth output port is connected to the inlet of the third channel of the seventh heat exchanger.

7. The cryogenic liquid medium based energy storage data center CCHP system of claim 5, wherein, The output electric energy of the renewable energy power generation system, the expansion generator and the fuel cell is collected on a power supply bus, the power supply bus is connected to the data center, the electrolytic cell, the first compressor, the second compressor, the circulation pump and the cryogenic pump, and the power supply bus provides electric energy supply.

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