Multi-combined supply system and method integrating Carnot battery energy storage and liquid hydrogen cold energyTechnical Field
The invention relates to the technical field of energy storage systems and liquid hydrogen cold energy utilization, in particular to a multi-combined supply system and method for integrating carnot battery energy storage and liquid hydrogen cold energy.
Background
Currently, renewable energy sources are required to seek efficient ways of storing electric energy due to their instability and intermittence in order to balance energy supply and demand. The application of the energy storage system can realize peak clipping and valley filling of electric power, solve the problem of instability of renewable energy power generation, be favorable for reducing dependence on fossil energy and ensure safety and stability of the energy system. In terms of pushing energy transformation, energy storage systems play an important role.
Pumped storage and compressed air storage are currently a means of enabling large scale commercial use. Compared with the two systems, the Carnot battery energy storage system is not limited by geographical conditions, has low initial cost and can meet the requirements of large energy storage, high density and the like under the condition of flexible application. Therefore, it is important to the development of energy storage technology in China.
For example, chinese patent publication No. CN 115095402A discloses a carnot battery energy storage system and a method of use, the carnot battery energy storage system includes an energy storage working unit, the energy storage working unit includes a first passage for circulating an energy storage working medium, the first passage includes an evaporator, a compressor unit, a heat storage device and a pressure reducing device connected in sequence, the energy release working unit includes a second passage for circulating an energy release working medium, the second passage includes a preheater connected to one end of the heat storage device, and an expansion unit, an energy release regenerator, a condenser, a pressure boosting device and a three-way valve connected in sequence to the other end of the heat storage device, the three-way valve is connected to the energy release regenerator through a first pipe, the energy release regenerator is connected to the heat storage device, the three-way valve is connected to the preheater through a second pipe, and the evaporator and the preheater are arranged in series in a flow passage of industrial waste heat medium. The Chinese patent document with the publication number of CN 113824139A discloses a method and a device for reforming the energy storage of a Carnot battery of a thermal power plant, wherein the method comprises a charging mode, a discharging mode and a discharging mode, wherein electric energy output by a thermal power unit or a renewable energy source is stored in an energy storage system in a heat energy form through a charging system, and the discharging mode comprises the step of converting heat energy in the energy storage system into electric energy through a discharging system.
Finding ways to replace fossil energy is becoming increasingly important. Hydrogen is used as a clean energy carrier and has important application in the fields of industry, steel, chemical industry, traffic, power generation and the like. The transportation and storage modes of the hydrogen comprise high-pressure gas transportation, pipeline transportation and liquid storage transportation. Liquid hydrogen storage is one of the important ways to improve hydrogen storage and transport efficiency. Currently, the development rate of global liquid hydrogen addition stations is rapid. However, the liquid hydrogen storage requires extremely low temperatures, and the hydrogen is gasified from-252.8 ℃ to 25 ℃ during the use process, which consumes a great deal of energy, and the part of cold energy is not fully utilized at present.
At present, few researches are carried out to combine a Carnot battery technology and a liquid hydrogen cold energy utilization technology, so that how to effectively utilize cold energy in a liquid hydrogen gasification process and establish a safe, economical and stable energy storage system is a problem to be solved by a person skilled in the art.
Disclosure of Invention
The invention provides a multi-combined supply system and a method for integrating the energy storage and the liquid hydrogen cold energy of a Carnot battery, which not only can utilize the cold energy in the liquid hydrogen gasification process, but also provides an economical, safe and efficient energy storage mode.
The technical scheme of the invention is as follows:
a multi-combined supply system integrating carnot battery energy storage and liquid hydrogen cold energy comprises a charging system, a discharging system, a low-temperature energy storage system, a high-temperature energy storage system, a liquid hydrogen cold energy utilization system, a fuel battery waste heat utilization system and a liquid hydrogen pipeline;
the charging system comprises a first compressor, a first condenser, a second compressor, a second condenser, a first throttle valve and a first evaporator which are communicated and circulated in sequence, wherein the charging system exchanges heat with a liquid hydrogen pipeline through the first condenser and the second condenser, and exchanges heat with the low-temperature energy storage system through the first evaporator;
The discharge system is in heat exchange with the high-temperature energy storage system through the second evaporator and the third evaporator, and is in heat exchange with the low-temperature energy storage system through the third condenser;
the low-temperature energy storage system comprises a high-temperature cold storage tank and a low-temperature cold storage tank, wherein a cold storage passage is formed between an outlet of the high-temperature cold storage tank and an inlet of the low-temperature cold storage tank, cold energy is absorbed by a first evaporator, a cold release passage is formed between an inlet of the high-temperature cold storage tank and an outlet of the low-temperature cold storage tank, and cold energy is released by a third condenser;
The high-temperature energy storage system comprises a high-temperature heat storage tank and a low-temperature heat storage tank, wherein a heat release passage is formed between an outlet of the high-temperature heat storage tank and an inlet of the low-temperature heat storage tank, heat is released through a second evaporator and a third evaporator, a heat storage passage is formed between an inlet of the high-temperature heat storage tank and an outlet of the low-temperature heat storage tank, and heat is absorbed through a fourth heat exchanger;
the liquid hydrogen cold energy utilization system comprises a power generation circulation system, and generates power by utilizing cold energy of a liquid hydrogen pipeline;
and the fuel cell waste heat utilization system is used for circularly absorbing waste heat of the fuel cell reactor through the vapor compression heat pump to provide heat energy for the discharge system.
In the charging system, a heating medium inlet side and an outlet side of a first condenser are respectively communicated with a first compressor outlet and a second compressor inlet, a heating medium inlet side and an outlet side of the second condenser are respectively communicated with a second compressor outlet and a first throttle valve inlet, a first throttle valve outlet is communicated with a first evaporator refrigerant inlet side, and a first evaporator refrigerant outlet side is communicated with the first compressor inlet.
In the discharge system, a refrigerant side inlet and an outlet of a second evaporator are respectively communicated with a first working medium pump outlet and a first expander inlet, a refrigerant side inlet and an outlet of a third evaporator are respectively communicated with a first expander outlet and a second expander inlet, an outlet of the second expander is communicated with a third condenser heating medium side inlet, and a third condenser heating medium outlet side is communicated with a first working medium pump inlet side.
The low-temperature energy storage system comprises a high-temperature cold storage tank, a third working medium pump, a low-temperature cold storage tank, a second mixer and a second shunt which are communicated and circulated in sequence, wherein the inlet side of the low-temperature cold storage tank is communicated with the outlet of the heat medium side of the first evaporator, the outlet of the low-temperature cold storage tank is communicated with the inlet of the second shunt, the inlet side of the second mixer is respectively communicated with the outlet of the refrigerant side of the heat exchanger exchanging heat with a cold user and the outlet of the third condenser, the inlet side of the high-temperature cold storage tank is communicated with the outlet of the second mixer, the outlet side of the high-temperature cold storage tank is respectively communicated with the inlet side of the refrigerant side of the heat exchanger exchanging heat with the cold user and the inlet side of the third condenser, and the outlet side of the third working medium pump is communicated with the inlet side of the heat medium side of the first evaporator.
The high-temperature energy storage system comprises a low-temperature heat storage tank, a second working medium pump, a fourth heat exchanger, a high-temperature heat storage tank, a first mixer and a first flow divider which are communicated and circulated in sequence, wherein the inlet side of the high-temperature heat storage tank is communicated with the refrigerant outlet side of the fourth heat exchanger, the outlet side of the high-temperature heat storage tank is communicated with the inlet side of the first flow divider, the outlet of the first flow divider is divided into two paths, one path is communicated with the heat exchanger heat medium inlet side exchanging heat with a heat user, the other path is communicated with the heat medium inlet of the third evaporator and the heat medium outlet of the second evaporator in sequence, the inlet side of the first mixer is communicated with the heat exchanger heat medium outlet of the heat user and the heat medium outlet of the second evaporator, the inlet side of the low-temperature heat storage tank is communicated with the inlet side of the second working medium pump, and the outlet side of the second working medium pump is communicated with the refrigerant inlet of the fourth heat exchanger.
The liquid hydrogen cold energy utilization system comprises a Brayton cycle power generation system, a Rankine power generation cycle system and an intermediate cold-carrying cycle system which are sequentially arranged along a liquid hydrogen pipeline.
The Brayton cycle power generation system comprises a third compressor, a first seawater heat exchanger, a third expander and a first heat exchanger which are communicated and circulated in sequence, wherein the first seawater heat exchanger exchanges heat with seawater, and the first heat exchanger exchanges heat with a liquid hydrogen pipeline.
The Brayton cycle power generation system takes helium as a working medium, the power generation process is as follows, the helium enters a first seawater heat exchanger after being pressurized by a third compressor, exchanges heat with seawater, enters a third expander for power generation after heating, the expanded helium enters the first heat exchanger and a liquid hydrogen pipeline for heat exchange, liquid hydrogen is gasified into a gaseous state, and the cooled helium enters the third compressor again to complete a closed Brayton power generation cycle.
The Rankine cycle power generation system comprises a fourth working medium pump, a second seawater heat exchanger, a fourth expander and a second heat exchanger which are communicated and circulated in sequence, wherein the second seawater heat exchanger exchanges heat with seawater, and the second heat exchanger exchanges heat with a liquid hydrogen pipeline.
The Rankine cycle power generation system uses propane as working medium, and the power generation process comprises the steps that liquid propane is pressurized by a fourth working medium pump and then is sent into a second seawater heat exchanger to exchange heat with seawater, then gasified, gaseous propane enters a fourth expander to generate power, the expanded gaseous propane enters the second heat exchanger to exchange heat with hydrogen and then is cooled into liquid propane, and the liquid propane enters the fourth working medium pump again to complete the closed Rankine cycle power generation.
The intermediate cold-carrying circulation system comprises a third heat exchanger and a sixth heat exchanger which are communicated and circulated, and the third heat exchanger is used for absorbing the cold energy of the liquid hydrogen pipeline, releasing the cold energy at the sixth heat exchanger and cooling the data center machine room.
The intermediate cold-carrying circulation system takes glycol aqueous solution as working medium, the working medium of the secondary refrigerant absorbs residual cold energy of hydrogen in the third heat exchanger, and releases cold energy in the sixth heat exchanger to cool the data center machine room.
The fuel cell waste heat utilization system comprises a fourth compressor, a second throttle valve and a fifth heat exchanger which are sequentially communicated, wherein the waste heat of the fuel cell reactor is absorbed by a passage between an outlet of the second throttle valve and an inlet of the fourth compressor through the fifth heat exchanger, and the heat energy is provided for the high-temperature energy storage system by a passage between the outlet of the fourth compressor and the inlet of the second throttle valve through the fourth heat exchanger.
The working process of the fuel cell waste heat utilization system is that the temperature of the gaseous working medium is increased after being pressurized by the fourth compressor, the gaseous working medium enters the fourth heat exchanger for liquefaction, heat is released to the working medium of the high-temperature energy storage system, the liquid working medium enters the second throttle valve for throttling and cooling, the liquid working medium enters the fifth heat exchanger after the pressure is reduced, the liquid working medium is heated and gasified by the waste heat of the fuel cell reactor, and the gaseous working medium enters the fourth compressor again to complete the vapor compression heat pump cycle.
Preferably, the working medium of the charging system is a mixture of argon and ethane, and the cycle is a vapor compression refrigeration cycle.
Preferably, the working medium of the discharge system is a mixture of argon and ethane, and the cycle is a Rankine cycle.
Preferably, the heat storage medium of the high-temperature energy storage system is n-pentane, and the cold storage medium of the low-temperature energy storage system is propane.
The invention also provides a multi-combined supply method based on the multi-combined supply system, and the operation strategy is as follows:
in the electricity consumption low-valley period, a charging system, a liquid hydrogen cold energy utilization system and a fuel cell waste heat utilization system are operated, electric energy of redundant electric power of a power grid, electric energy of the liquid hydrogen cold energy utilization system and electric energy of a fuel cell reactor are input into a compressor, the electric energy is converted into cold energy to be stored in a low-temperature energy storage system, and the waste heat of the fuel cell reactor is stored in a high-temperature energy storage system after being upgraded by a vapor compression heat pump;
The discharge system is operated in the electricity peak period to convert the stored cold energy and heat energy into electric energy for users to use;
In a cooling season, the flow proportion of a low-temperature energy storage system diverter is regulated according to the requirements of users, and partial cooling capacity is supplied to cold users;
In the heating season, the flow proportion of the high-temperature energy storage system diverter is regulated according to the demands of users, and partial heat is supplied to the hot users.
Compared with the prior art, the invention has the beneficial effects that:
(1) The charging process converts redundant electric energy of the power grid, electric energy generated by utilizing liquid hydrogen cold energy and electric energy generated by the fuel cell into cold energy to be stored, and converts the stored cold energy into electric energy again in the discharging process, so that the effective conversion of the electric energy and the cold energy is realized.
(2) The invention realizes the energy storage of the Carnot cell, and simultaneously utilizes a large amount of cold energy generated in the liquid hydrogen gasification process and a large amount of heat energy released by the end user fuel cell when generating electric energy, thereby reducing energy waste and avoiding environmental pollution.
(3) The invention realizes the gasification of liquid hydrogen, satisfies the supply of hydrogen to downstream users, realizes the power generation through the heat exchanger by using cold energy in the liquid hydrogen gasification process, avoids the waste of cold energy and improves the energy utilization efficiency by using the cold energy with high, medium and low grades in the liquid hydrogen gasification process.
(4) The high-temperature energy storage system and the low-temperature energy storage system can adjust supply according to the cold and hot energy requirements of users in the charging and discharging processes, and a cold-heat-power combined comprehensive energy system is constructed.
Drawings
Fig. 1 is a schematic structural diagram of a multi-combined supply system of integrated carnot battery energy storage and liquid hydrogen cold energy provided in an embodiment of the present invention;
Reference numerals illustrate 1, a first compressor; 2, a first condenser; 3, a second compressor; the heat-storage system comprises a first condenser, a second condenser, a first throttle valve, a first evaporator, a first working medium pump, a second evaporator, a first expander, a second expander, a third evaporator, a fourth working medium pump, a fifth working medium pump, a fourth working medium pump, a heat-storage device, a third working medium pump, a fourth working medium pump, a fifth working medium pump, a third working medium, a fifth working medium, a first heat, a fifth working medium, a second working medium, a second, a third, a high second storage, a high a high 2.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a multi-combined supply system and method for integrating the energy storage of a Carnot battery and the liquid hydrogen cold energy, which not only can realize efficient, stable, economic and safe energy storage, but also can utilize the cold energy in the liquid hydrogen gasification process, thereby effectively reducing energy waste.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Referring to fig. 1, the embodiment provides a multi-combined supply system integrating carnot battery energy storage and liquid hydrogen cold energy, which comprises a charging process, a discharging process, a high-temperature energy storage system, a low-temperature energy storage system, a liquid hydrogen cold energy utilization system and a fuel cell waste heat utilization system.
In the specific use process, the charging process comprises a first compressor 1, a first condenser 2 exchanging heat with liquid hydrogen cold energy, a second compressor 3, a second condenser 4 exchanging heat with liquid hydrogen cold energy, a first throttle valve 5 and a first evaporator 6 exchanging heat with a cold storage side, wherein the heat medium inlet side and the heat medium outlet side of the first condenser 2 are respectively communicated with the inlet of the first compressor 1 and the inlet of the second compressor 3, the heat medium inlet side and the heat medium outlet side of the second condenser 4 are respectively communicated with the outlet of the second compressor 3 and the inlet of the first throttle valve 5 so as to exchange heat with working media by utilizing cold energy in the liquid hydrogen gasification process, the outlet of the first throttle valve 5 is communicated with the refrigerant inlet side of the first evaporator 6 so as to exchange heat with the cold energy of the liquid working media in the charging process and the working media in the low-temperature energy storage process, and the refrigerant outlet side of the first evaporator 6 is communicated with the inlet of the first compressor 1.
In this embodiment, specifically, when the charging process is running, the electric energy generated by cold power generation in the low-load power grid, the electric energy generated by power generation in the liquid hydrogen gasification process and the electric energy generated by power generation of the fuel cell drive the first compressor 1 and the second compressor 3, the first compressor 1 compresses the working medium, so that the temperature and the pressure of the working medium are increased, the high-temperature high-pressure gaseous working medium enters the first condenser 2 and the liquid hydrogen gasification pipeline for heat exchange, the low-temperature high-pressure gaseous working medium enters the second compressor 3 after the temperature is reduced, the high-temperature high-pressure gaseous working medium enters the second condenser 4 and the liquid hydrogen gasification pipeline for heat exchange, the cold energy liquefies the gaseous working medium, the liquid working medium enters the first throttle valve 5 for further throttling and cooling, the supercooling degree of the working medium is increased, the low-temperature low-pressure liquid working medium enters the first evaporator 6 and the working medium in the low-temperature energy storage process for heat exchange, the cold energy is transferred to the low-temperature energy storage working medium, and then enters the first compressor 1 again after the gasification, and the vapor compression refrigeration cycle of the charging process is completed.
In this embodiment, specifically, the discharging process includes a first working medium pump 7, a first expander 9, a second expander 11, a third condenser 12 exchanging heat with the cold storage side, a second evaporator 8 exchanging heat with the heat storage side, and a third evaporator 10, wherein the inlet and outlet of the refrigerant side of the second evaporator 8 are respectively communicated with the outlet of the first working medium pump 7 and the inlet of the first expander 9, the inlet and outlet of the refrigerant side of the third evaporator 10 are respectively communicated with the outlet of the first expander 9 and the inlet of the second expander 11, the outlet of the second expander 11 is communicated with the inlet of the heat medium side of the third condenser 12, and the outlet side of the heat medium of the third condenser 12 is communicated with the inlet side of the first working medium pump 7.
In this embodiment, specifically, during the discharging process, the gaseous working medium in the discharging process is cooled and liquefied by the working medium stored at low temperature through the third condenser 12, the liquid working medium is pressurized by the first working medium pump 7 and then enters the second evaporator 8, the liquid working medium is heated and gasified in the second evaporator 8 by the working medium in the high-temperature energy storage process, the gaseous working medium enters the first expander 9 to generate electricity, the low-temperature working medium coming out of the first expander 9 enters the third evaporator 10 to generate electricity after being heated by the third evaporator 10, the cold energy is converted into electric energy, the low-temperature low-pressure working medium after the electricity generation enters the third condenser 12, and the rankine cycle of the discharging process is completed.
In this embodiment, specifically, the high temperature energy storage system includes a high temperature heat storage tank 17, a low temperature heat storage tank 14, a second working medium pump 15, a first mixer 13 and a first diverter 18, where an inlet side of the high temperature heat storage tank 17 is connected to a refrigerant outlet side of the vapor compression heat pump heat release side fourth heat exchanger 16, an outlet of the high temperature heat storage tank 17 is connected to an inlet of the first diverter 18, an outlet of the first diverter 18 is connected to a heat medium side inlet of the heat consumer heat exchanger 19 and a heat medium side inlet of the discharge process third evaporator 10, an inlet side of the first mixer 13 is connected to an outlet of the heat consumer heat exchanger 19 and a heat medium side outlet of the discharge process second evaporator 8, and an inlet side of the low temperature heat storage tank 14 is connected to an outlet of the first mixer 13 and an inlet side of the second working medium pump 15, respectively, and an outlet side of the second working medium pump 15 is connected to a refrigerant side inlet of the vapor compression heat pump heat release side fourth heat exchanger 16.
In this embodiment, specifically, the high-temperature heat storage working medium in the high-temperature heat storage tank 17 enters the first flow divider 18, so that the flow ratio flowing to the heat exchanger 19 of the heat consumer and the third evaporator 10 in the discharging process can be adjusted according to the energy consumption requirement of the heat consumer to release heat, thereby meeting the heat supply requirement of the heat consumer. The heat released enters the first mixer 13 and flows to the low-temperature heat storage tank 14, the heat storage medium in the low-temperature heat storage tank 14 is pressurized by the second working medium pump 15 and then enters the fourth heat exchanger 16, the heat of the fuel cell waste heat after the grade is improved by the vapor compression heat pump is absorbed, and then the heat enters the high-temperature heat storage tank 17 for heat storage.
In this embodiment, specifically, the low temperature energy storage system includes a high temperature heat-storage tank 35, a low temperature heat-storage tank 37, a third working medium pump 36, a second mixer 40, and a second splitter 38, the inlet side and the outlet side of the low temperature heat-storage tank 37 are respectively connected to the heat-medium side outlet of the charging process first evaporator 6 and the inlet side of the second splitter 38, the outlet side of the second splitter 38 is connected to the cool-medium side inlet of the cold-user heat exchanger 39 and the cool-medium side inlet of the discharging process third condenser 12, the inlet side of the second mixer 40 is connected to the cool-medium side outlet of the cold-user heat exchanger 39 and the cool-medium side outlet of the discharging process third condenser 12, and the inlet side and the outlet side of the high temperature heat-storage tank 35 are respectively connected to the outlet side of the second mixer 40 and the inlet side of the third working medium pump 36, and the outlet side of the third working medium pump 36 is connected to the heat-medium side inlet side of the charging process first evaporator 6.
In this embodiment, specifically, the low-temperature cold storage medium in the low-temperature cold storage tank 37 enters the second current divider 38, and the flow ratio of the heat exchanger flowing to the heat exchange with the cold user and the third condenser 12 in the discharging process can be adjusted according to the energy consumption requirement of the cold user to release the cold energy, so as to meet the cold supply requirement of the cold user. The cold energy released enters the second mixer 40 to flow to the high temperature heat-storage tank 35, and the heat-storage medium in the high temperature heat-storage tank 35 is pressurized by the third working medium pump 36, enters the first evaporator 6 of the charging process to absorb the cold energy from the charging process, and then enters the low temperature heat-storage tank 37 to store the cold.
In the embodiment, the liquid hydrogen cold energy utilization system comprises a Brayton power generation cycle, a Rankine power generation cycle, a data center cooling cycle, a first condenser 2 and a second condenser 4 in a charging process exchange heat with a liquid hydrogen pipeline to provide cold energy for the charging process, and the liquid hydrogen cold energy utilization system comprises the Brayton cycle power generation process taking helium as a working medium, wherein the helium sequentially passes through a third compressor 28 to be pressurized and then enters a first seawater heat exchanger 29 to exchange heat with seawater, enters a third expander 30 to generate power after heating, the helium after expansion power generation enters the first heat exchanger 24 to exchange heat with liquid hydrogen, the liquid hydrogen is gasified into a gaseous state, and the cooled helium enters the third compressor 28 again to complete the closed Brayton power generation cycle. The Rankine cycle power generation process using propane as working medium comprises the steps of pressurizing liquid propane by a fourth working medium pump 31, sending the liquid propane into a second seawater heat exchanger 32, exchanging heat with seawater, gasifying the liquid propane, sending the gaseous propane into a fourth expander 33 for power generation, sending the gaseous propane after power generation into the second heat exchanger 25, exchanging heat with hydrogen to be cooled into liquid propane, sending the liquid propane into the fourth working medium pump 31 again to complete a closed Rankine cycle power generation process, and cooling a data center by using glycol aqueous solution as working medium.
In this embodiment, specifically, the heater 27 is used for adjusting the temperature of the hydrogen, so as to adjust the temperature of the outlet hydrogen according to different terminal requirements, thereby realizing flexible air supply.
In this embodiment, specifically, the fuel cell waste heat utilization system includes a fuel cell reactor 41, the vapor compression heat pump cycle provides heat energy for the discharging process, the gaseous working medium is pressurized by a fourth compressor 22 and then is heated, enters a fourth heat exchanger 16 for liquefaction, releases heat to the working medium of the high-temperature energy storage system, the liquid working medium enters a second throttle valve 20 for throttling and cooling, enters a fifth heat exchanger 21 after the pressure is reduced, is heated and gasified by the fuel cell waste heat, and the gaseous working medium enters the fourth compressor 22 again to complete the vapor compression heat pump cycle, so that the grade of the fuel cell waste heat is improved.
In this embodiment, specifically, the working medium in the charging process is a mixture of argon and ethane, and the cycle is a vapor compression refrigeration cycle.
In this embodiment, specifically, the working medium in the discharging process is a mixture of argon and ethane, and the cycle is a rankine cycle.
In this embodiment, specifically, the heat storage medium of the high-temperature energy storage system is n-pentane, and the cold storage medium of the low-temperature energy storage system is propane.
In this embodiment, specifically, the multi-combination method of integrating the carnot battery energy storage and the liquid hydrogen cold energy includes charging, discharging, heating and cooling, and specific operation strategies are as follows:
in the electricity consumption valley period, a charging process, a liquid hydrogen cold energy utilization system and a fuel cell waste heat utilization system are operated, the charging process inputs redundant electric power of a power grid, electric energy generated by the liquid hydrogen cold energy and electric energy generated by the fuel cell into a compressor, the electric energy is converted into cold energy to be stored in a low-temperature energy storage system, and the waste heat of the fuel cell is stored in a high-temperature energy storage system after being upgraded by a vapor compression heat pump;
the electricity consumption peak period is used for running a discharging process, and the stored cold energy and heat energy are converted into electric energy for users to use;
In a cooling season, the flow proportion of a low-temperature energy storage system diverter is regulated according to the requirements of users, and partial cooling capacity is supplied to cold users;
In the heating season, the flow proportion of the high-temperature energy storage system diverter is regulated according to the demands of users, and partial heat is supplied to the hot users.
The foregoing embodiments have described the technical solutions and advantages of the present invention in detail, and it should be understood that the foregoing embodiments are merely illustrative of the present invention and are not intended to limit the invention, and any modifications, additions, substitutions and the like that fall within the principles of the present invention should be included in the scope of the invention.