Multi-energy coupling system and control method thereof

Abstract

The invention relates to a multi-energy coupling system and a control method thereof. The system comprises a wind and light energy supply system, an energy storage system, a refrigeration system and an energy release system, the energy storage system is connected with the wind and light energy supply system, the refrigeration system and the energy release system, and the energy release system is connected with the wind and light energy supply system and the refrigeration system; the energy storage system converts electric energy output by the wind and light energy supply system into heat energy of the heat storage tank, cold energy of the cold storage tank, heat energy of the hot water tank and heat energy of the hot water tank, and temperature adjustment and energy recovery are conducted through the hot water tank. The refrigerating system converts heat energy in the heat storage tank into cold energy in the chilled water tank, and meanwhile the hot water tank is used for cooling and heat recovery. The energy release system converts heat energy in the heat storage tank and cold energy in the cold storage tank into mechanical energy of the second compressor and the second turbine to generate power, meanwhile, the hot water tank is used for energy recovery and temperature adjustment, in other words, all energy sources come from renewable energy sources, the energy sources are mutually converted, and zero-carbon energy supply is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of energy conservation and environmental protection, and in particular to a multi-energy coupling system and a control method thereof. Background Art

[0002] With the popularization of new energy production and utilization forms such as photovoltaic, solar thermal, wind power and combined heat and power systems, multi-energy coupling systems characterized by "multi-energy coupling and complementarity, and energy cascade utilization" have become the main development trend of current energy utilization models with their unique economic, environmental and energy-saving advantages.

[0003] A typical multi-energy coupling system is the Combined Cooling, Heating and Power (CCHP) system. However, the energy of existing CCHP systems mostly comes from primary energy (gas) or direct electric drive, which still requires additional energy consumption and cannot achieve zero-carbon energy supply. Summary of the Invention

[0004] Based on this, it is necessary to provide a multi-energy coupling system and its control method that can achieve zero-carbon energy supply to address the above technical problems.

[0005] In a first aspect, the present application provides a multi-energy coupling system, which includes a wind-solar energy supply system, an energy storage system, a refrigeration system, and an energy release system. The energy storage system is respectively connected to the wind-solar energy supply system, the refrigeration system, and the energy release system. The energy release system is respectively connected to the wind-solar energy supply system and the refrigeration system.

[0006] The energy storage system includes a first compressor, a first turbine, a heat storage tank, a cold storage tank, a hot water tank, and an energy storage heat exchanger. The wind and solar energy supply systems are connected to the first compressor and the first turbine, respectively. The gas working fluid in the first compressor circulates with the gas working fluid in the first turbine through the energy storage heat exchanger. The energy storage heat exchanger exchanges heat with the heat storage tank, the cold storage tank, and the hot water tank, respectively.

[0007] The refrigeration system includes a generator, a condenser, an evaporator, an absorber, a chilled water tank, a refrigeration heat exchanger and a throttle valve. The generator is connected to the heat storage tank, and the liquid working medium in the generator exchanges heat with the heat storage working medium in the heat storage tank. The liquid working medium in the generator is vaporized into a gas working medium and converted into liquid through the condenser. It then passes through the throttle valve and the evaporator in sequence and is converted into gas. It then passes through the absorber and the refrigeration heat exchanger in sequence and returns to the generator. The liquid in the generator exchanges heat with the liquid at the absorber outlet through the refrigeration heat exchanger and then returns to the absorber. The evaporator exchanges heat with the chilled water tank, and the condenser and the absorber exchange heat with the hot water tank respectively.

[0008] The energy release system includes a second compressor, a second turbine and an energy release heat exchanger, wherein the gas working fluid in the second compressor circulates with the gas working fluid in the second turbine through the energy release heat exchanger, and the energy release heat exchanger exchanges heat with the heat storage tank, the cold storage tank and the hot water tank respectively.

[0009] In one embodiment, the heat storage tank includes a first heat storage tank and a second heat storage tank, wherein the temperature range corresponding to the heat storage medium in the first heat storage tank is greater than the temperature range corresponding to the heat storage medium in the second heat storage tank; the energy storage heat exchanger includes a first heat exchanger, a second heat exchanger, a third heat exchanger, a fourth heat exchanger, a fifth heat exchanger, and a sixth heat exchanger;

[0010] The gaseous working medium in the first compressor is sequentially transmitted to the first turbine through the first heat exchanger, the second heat exchanger, the third heat exchanger and the fourth heat exchanger. The gaseous working medium in the first turbine is sequentially transmitted to the first compressor through the fifth heat exchanger, the sixth heat exchanger and the third heat exchanger. The first heat exchanger exchanges heat with the first heat storage tank, the second heat exchanger exchanges heat with the second heat storage tank, the third heat exchanger exchanges heat with the first compressor and the first turbine respectively, the fourth heat exchanger exchanges heat with the hot water tank, the fifth heat exchanger exchanges heat with the cold storage tank, and the sixth heat exchanger exchanges heat with the hot water tank.

[0011] In one embodiment, the energy storage system further includes a first flow regulating valve and a second flow regulating valve;

[0012] The first flow regulating valve is connected between the fourth heat exchanger and the hot water tank; the second flow regulating valve is connected between the sixth heat exchanger and the hot water tank.

[0013] In one embodiment, the refrigeration heat exchanger includes a seventh heat exchanger;

[0014] The liquid working medium in the generator exchanges heat with the heat storage working medium in the second heat storage tank. The liquid working medium in the generator is vaporized into gaseous working medium and returns to the generator through the condenser, throttle valve, evaporator, absorber and seventh heat exchanger in sequence. The liquid in the generator exchanges heat with the liquid at the absorber outlet through the seventh heat exchanger and then returns to the absorber.

[0015] In one embodiment, the refrigeration system further includes a throttle valve connected between the condenser and the evaporator.

[0016] In one embodiment, the energy-releasing heat exchanger includes an eighth heat exchanger, a ninth heat exchanger, a tenth heat exchanger, an eleventh heat exchanger, a twelfth heat exchanger, and a thirteenth heat exchanger;

[0017] The gaseous working medium in the second compressor is sequentially transmitted to the second turbine through the eighth heat exchanger, the ninth heat exchanger, the tenth heat exchanger and the eleventh heat exchanger. The gaseous working medium in the second turbine is sequentially transmitted to the second compressor through the tenth heat exchanger, the twelfth heat exchanger and the thirteenth heat exchanger. The eighth heat exchanger exchanges heat with the hot water tank, the ninth heat exchanger exchanges heat with the second heat storage tank, the tenth heat exchanger exchanges heat with the second compressor and the second turbine respectively, the eleventh heat exchanger exchanges heat with the first heat storage tank, the twelfth heat exchanger exchanges heat with the hot water tank, and the thirteenth heat exchanger exchanges heat with the cold storage tank.

[0018] In one embodiment, the energy release system further includes a third flow regulating valve, a fourth flow regulating valve and a fifth flow regulating valve;

[0019] The third flow regulating valve is connected between the eighth heat exchanger and the hot water tank; the fourth flow regulating valve is connected between the twelfth heat exchanger and the hot water tank; the fifth flow regulating valve is connected between the second turbine and the eleventh heat exchanger.

[0020] In one embodiment, the wind-solar energy supply system includes a photovoltaic mirror field, a wind farm, and a solar thermal mirror field;

[0021] The photovoltaic mirror field and the wind farm are both connected to the busbar, and the first compressor and the first turbine are respectively connected to the busbar;

[0022] The photothermal mirror field is connected to the hot water tank.

[0023] In a second aspect, the present application further provides a control method for a multi-energy coupling system. The control method is applied to the multi-energy coupling system as described above, and the method includes:

[0024] When a reduction in the power load is detected, controlling the first compressor and the first turbine to enter an operating state;

[0025] When an increase in the electric load is detected, the second compressor and the second turbine are controlled to enter an operating state.

[0026] In a third aspect, the present application further provides a computer device comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the above method when executing the computer program.

[0027] The above-mentioned multi-energy coupling system and its control method, the multi-energy coupling system includes a wind-solar energy supply system, an energy storage system, a refrigeration system and an energy release system, the energy storage system is respectively connected to the wind-solar energy supply system, the refrigeration system and the energy release system, and the energy release system is respectively connected to the wind-solar energy supply system and the refrigeration system; wherein, the energy storage system converts the electric energy output by the wind-solar energy supply system into the heat energy of the heat storage tank, the cold energy of the cold storage tank, and the heat energy of the hot water tank, and uses the hot water tank for temperature regulation and energy recovery; the refrigeration system converts the heat energy in the heat storage tank into the cold energy in the chilled water tank, and uses the hot water tank for cooling and heat recovery; the energy release system converts the heat energy in the heat storage tank and the cold energy in the cold storage tank into mechanical energy of the second compressor and the second turbine to generate electricity, and uses the hot water tank for energy recovery and temperature regulation; this application is provided with a wind-solar energy supply system, a heat storage tank, a cold storage tank, a chilled water tank, a hot water tank and multiple heat exchangers, and all energy comes from renewable energy and the energy is converted into each other, thereby achieving zero-carbon energy supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments of the present application or related technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 is a structural block diagram of a multi-energy coupling system in one embodiment;

[0030] Figure 2 A structural block diagram of a multi-energy coupling system in another embodiment;

[0031] Figure 3 1 is a flow chart of a control method for a multi-energy coupling system according to an embodiment;

[0032] Figure 4 FIG. 1 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0034] It should be noted that the terms "first", "second", etc. used in this application may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from the second element. The terms "including" and "having" used in this application and any variations thereof are intended to cover non-exclusive inclusions. The term "plurality" used in this application refers to two or more. The term "and / or" used in this application refers to one of the solutions or any combination of multiple solutions.

[0035] Existing trigeneration systems, which mostly rely on natural gas, fossil fuels, or direct electricity, still require additional energy, resulting in high carbon emissions and failing to meet carbon neutrality goals (zero-carbon energy supply). Furthermore, renewable energy sources (photovoltaic and wind power) are highly volatile, making it difficult to ensure stable energy supply to the park when used alone. Existing energy storage systems, which mostly rely on single-use electricity storage, lack coordinated scheduling of cooling and heating storage, requiring further improvement in energy quality and overall energy efficiency.

[0036] The multi-energy coupling system provided in the embodiment of the present application includes a wind-solar energy supply system, an energy storage system, a refrigeration system and an energy release system. The energy storage system is respectively connected to the wind-solar energy supply system, the refrigeration system and the energy release system, and the energy release system is respectively connected to the wind-solar energy supply system and the refrigeration system; wherein the energy storage system converts the electric energy output by the wind-solar energy supply system into the heat energy of the heat storage tank, the cold energy of the cold storage tank and the heat energy of the hot water tank, and uses the water temperature of different height areas in the hot water tank to achieve temperature regulation and energy recovery; the refrigeration system converts the heat energy in the heat storage tank into the cold energy in the chilled water tank, and uses the hot water tank for cooling and heat recovery; the energy release system converts the heat energy in the heat storage tank and the cold energy in the cold storage tank into mechanical energy of the second compressor and the second turbine to generate electricity, and uses the hot water tank for energy recovery and temperature regulation. All energy comes from renewable energy and the energy sources are converted into each other, realizing zero-carbon energy supply.

[0037] In an exemplary embodiment, Figure 1 As shown, a multi-energy coupling system is provided, which includes a wind-solar energy supply system 100, an energy storage system 200, a refrigeration system 300 and an energy release system 400. The energy storage system 200 is respectively connected to the wind-solar energy supply system 100, the refrigeration system 300 and the energy release system 400, and the energy release system 400 is respectively connected to the wind-solar energy supply system 100 and the refrigeration system 300.

[0038] The energy storage system 200 includes a first compressor 210, a first turbine 220, a heat storage tank 230, a cold storage tank 240, a hot water tank 250, and an energy storage heat exchanger 260. The wind-solar energy supply system 100 is connected to the first compressor 210 and the first turbine 220, respectively. The gas working fluid in the first compressor 210 circulates with the gas working fluid in the first turbine 220 through the energy storage heat exchanger 260. The energy storage heat exchanger 260 exchanges heat with the heat storage tank 230, the cold storage tank 240, and the hot water tank 250, respectively.

[0039] The refrigeration system 300 includes a generator 310, a condenser 320, an evaporator 330, an absorber 340, a chilled water tank 350, a refrigeration heat exchanger 360 and a throttle valve 370, wherein the generator 310 is connected to the heat storage tank 230, and the liquid working medium in the generator 310 exchanges heat with the heat storage working medium in the heat storage tank 230. The liquid working medium in the generator 310 is vaporized into a gas working medium and converted into liquid through the condenser 320, and then sequentially passes through the throttle valve 370 and the evaporator 330 to be converted into gas, and then sequentially passes through the absorber 340 and the refrigeration heat exchanger 360 to return to the generator 310. The liquid in the generator 310 exchanges heat with the liquid at the outlet of the absorber 340 through the refrigeration heat exchanger 360 and then returns to the absorber 340. The evaporator 330 exchanges heat with the chilled water tank 350, and the condenser 320 and the absorber 340 exchange heat with the hot water tank 250 respectively.

[0040] The energy release system 400 includes a second compressor 410, a second turbine 420 and an energy release heat exchanger 430, wherein the gas working medium in the second compressor 410 circulates with the gas working medium in the second turbine 420 through the energy release heat exchanger 430, and the energy release heat exchanger 430 exchanges heat with the heat storage tank 230, the cold storage tank 240 and the hot water tank 250 respectively.

[0041] The devices included in the wind-solar energy supply system 100 can be set according to actual conditions, as long as they can meet the function of generating electricity using wind and light (renewable resources).

[0042] Specifically, if Figure 1As shown, the wind-solar energy supply system 100 outputs electrical energy to the first compressor 210 and the first turbine 220. The gas working medium circulating in the first compressor 210 and the first turbine 220 is air or carbon dioxide. The gas working medium passes through the compressor, increases in temperature and pressure, passes through the energy storage heat exchanger 260, exchanges heat with the heat storage working medium in the heat storage tank 230, and stores the heat in the heat storage tank 230. After the temperature of the gas working medium decreases, it enters the first turbine 220. After passing through the first turbine 220, the gas working medium cools down and reduces in pressure. , re-enters the energy storage heat exchanger 260, exchanges heat with the cold storage working medium in the cold storage tank 240, and exchanges heat with the water in the hot water tank 250. After the gas working medium is heated, it exchanges heat with the gas at the outlet of the first compressor 210, and the temperature is further increased. Then it enters the first compressor 210 to be heated and pressurized, completing an energy storage cycle. The energy storage cycle converts electrical energy into heat energy of the heat storage tank 230 and cold energy of the cold storage tank 240 in sequence, and realizes temperature regulation and energy recovery through the hot water tank 250.

[0043] When thermal energy is stored in the thermal storage tank 230, a pump at the top of the thermal storage tank 230 delivers the stored thermal fluid to the generator 310 for heat exchange, heating the liquid fluid (lithium bromide solution) in the generator 310 before returning it to the bottom of the thermal storage tank 230. After the liquid fluid in the generator 310 is heated, it evaporates and enters the condenser 320. Inside the condenser 320, it is cooled by cold water from the bottom of the hot water tank 250, condensing into a liquid. The liquid passes through the throttle valve 370, reducing its pressure, and then flows to the evaporator 330. The hot chilled water in the evaporator 330 enters the evaporator 330 from the top of the chilled water tank 350, where it is vaporized into water vapor, which then enters the absorber 340. The hot chilled water releases heat and cools down to become chilled water at 3-7 degrees Celsius, which is then stored at the bottom of the chilled water tank 350. After entering absorber 340, the water vapor mixes with the liquid working medium (concentrated lithium bromide solution) from the bottom of generator 310 and is cooled by cold water from hot water tank 250. The cold liquid working medium then enters generator 310, where it exchanges temperature with the hot liquid working medium (concentrated lithium bromide solution) from generator 310 through refrigeration heat exchanger 360, raising its temperature. The liquid working medium (concentrated lithium bromide solution) is heated within generator 310, increasing its temperature and solubility. Simultaneously, the water evaporates into water vapor, completing a refrigeration cycle. This refrigeration cycle converts heat from thermal storage tank 230 into cold energy for chilled water tank 350, while also utilizing hot water tank 250 for cooling and heat recovery.

[0044] When the electrical load increases, the energy release system is required to release energy. The gaseous fluid from the second compressor 410 enters the energy release heat exchanger 430, where it exchanges heat with the hot water at the top of the hot water tank 250, raising its temperature. The hot water cools down after the heat exchange and returns to the bottom of the hot water tank 250. After being heated in the energy release heat exchanger 430, the gaseous fluid exchanges heat with the thermal fluid from the heat storage tank 230, absorbing the thermal energy from the heat storage tank 230 and raising its temperature. The gaseous fluid then exchanges heat with the outlet gaseous fluid from the second turbine 420, raising its temperature. The gaseous fluid then enters the energy release heat exchanger 430, where it exchanges heat with the thermal fluid from the heat storage tank 230, absorbing the thermal energy from the heat storage tank 230 and raising its temperature. The gaseous fluid then enters the second turbine 420 to generate electricity. The second turbine 420 is coaxially connected to the second compressor 410, driving the compressor's rotation. After working in the second turbine 420, the temperature and pressure of the gaseous fluid decreases. It then enters the energy-discharging heat exchanger 430, where it exchanges heat with the outlet gaseous fluid from the second compressor 410, lowering its temperature. It also exchanges heat with the cold water in the hot water tank 250, which then returns to the hot side of the hot water tank 250. After cooling in the energy-discharging heat exchanger 430, the gaseous fluid exchanges heat with the cold storage fluid in the cold storage tank 240, absorbing cold energy and lowering its temperature. The cold storage fluid then absorbs heat and returns to the top of the cold storage tank 240. The gaseous fluid then enters the second compressor 410, where it is heated and pressured, before entering the energy-discharging heat exchanger 430, completing the energy-discharging cycle. This energy-discharging cycle converts the heat energy in the heat storage tank 230 and the cold energy in the cold storage tank 240 into mechanical energy for the turbine-compressor unit (second compressor 410 and second turbine 420) to generate electricity. The water in the hot water tank 250 is also used for energy recovery and temperature regulation.

[0045] The above-mentioned multi-energy coupling system includes a wind-solar energy supply system, an energy storage system, a refrigeration system and an energy release system. The energy storage system is respectively connected to the wind-solar energy supply system, the refrigeration system and the energy release system, and the energy release system is respectively connected to the wind-solar energy supply system and the refrigeration system. Among them, the energy storage system converts the electric energy output by the wind-solar energy supply system into the heat energy of the heat storage tank, the cold energy of the cold storage tank and the heat energy of the hot water tank, and uses the hot water tank for temperature regulation and energy recovery; the refrigeration system converts the heat energy in the heat storage tank into the cold energy in the chilled water tank, and uses the hot water tank for cooling and heat recovery; the energy release system converts the heat energy in the heat storage tank and the cold energy in the cold storage tank into mechanical energy of the second compressor and the second turbine to generate electricity, and uses the hot water tank for energy recovery and temperature regulation. All energy comes from renewable energy and the energies are converted into each other, realizing zero-carbon energy supply.

[0046] In one embodiment, Figure 2As shown, the heat storage tank includes a first heat storage tank and a second heat storage tank, wherein the temperature range corresponding to the heat storage medium in the first heat storage tank is greater than the temperature range corresponding to the heat storage medium in the second heat storage tank; the energy storage heat exchanger includes a first heat exchanger, a second heat exchanger, a third heat exchanger, a fourth heat exchanger, a fifth heat exchanger and a sixth heat exchanger;

[0047] The gaseous working medium in the first compressor is sequentially transmitted to the first turbine through the first heat exchanger, the second heat exchanger, the third heat exchanger and the fourth heat exchanger. The gaseous working medium in the first turbine is sequentially transmitted to the first compressor through the fifth heat exchanger, the sixth heat exchanger and the third heat exchanger. The first heat exchanger exchanges heat with the first heat storage tank, the second heat exchanger exchanges heat with the second heat storage tank, the third heat exchanger exchanges heat with the first compressor and the first turbine respectively, the fourth heat exchanger exchanges heat with the hot water tank, the fifth heat exchanger exchanges heat with the cold storage tank, and the sixth heat exchanger exchanges heat with the hot water tank.

[0048] It should be noted that Figure 2 1, 2, ..., 12, and 13 represent the first heat exchanger, the second heat exchanger, ..., the twelfth heat exchanger, and the thirteenth heat exchanger, respectively; Figure 2 A1 represents the cold side of the hot water tank, A2 represents the hot side of the hot water tank, B1 represents the cold side of the cold storage tank, and B2 represents the hot side of the cold storage tank; the first heat storage tank corresponds to Figure 2 The high temperature heat storage tank in the second heat storage tank corresponds to Figure 2 The medium temperature heat storage tank and cold storage tank correspond to Figure 2 The low temperature cold storage tank in the first compressor corresponds to Figure 2 Compressor 1, the second compressor corresponds to Figure 2 Compressor 2 in the first turbine corresponds to Figure 2 Turbine 1 in the second turbine corresponds to Figure 2 Turbine 2 in Figure 2 The overlapping lines in the .

[0049] Among them, the heat storage medium in the high-temperature heat storage tank can be molten salt or other media with a working temperature between 300-500 degrees; the heat storage medium in the medium-temperature heat storage tank can be thermal oil or other media with a working temperature between 120-250 degrees; the cold storage medium in the low-temperature cold storage tank can be ethylene glycol or other working temperature between -100-0 degrees, which is not limited in the embodiments of this application.

[0050] Specifically, if Figure 2As shown, when the multi-energy coupling system is in the off-peak period (power load reduction), the switch on the left side of the motor M is closed, and the multi-energy coupling system starts the energy storage mode. The motor drives the compressor 1 and the turbine to rotate. The compressor 1 and the turbine 1 are coaxially connected. The circulating gas working medium passes through the compressor 1, increases in temperature and pressure, passes through the heat exchanger 1, exchanges heat with the medium in the high-temperature heat storage tank, and stores the high-temperature heat in the high-temperature heat storage tank. Then, it passes through the heat exchanger 2 and exchanges heat with the heat storage medium in the medium-temperature heat storage tank, and stores the heat in the medium-temperature heat storage tank. Then, it enters the heat exchanger 3 and exchanges heat with the gas working medium flowing out of the turbine 1, and the temperature is further reduced. Finally, it passes through the heat exchanger 4 and exchanges heat with the gas working medium from the heat exchanger 4. The cold water at the bottom of the hot water tank undergoes heat exchange. Heat exchanger 4 is provided to regulate the temperature at the inlet of turbine 1. After exiting heat exchanger 4, the gas medium enters turbine 1 for rotation, saving some compression work. After passing through turbine 1, the gas cools down and its pressure drops, entering heat exchanger 5 to exchange heat with the cold working medium in the low-temperature cold storage tank. After releasing its cold energy, the gas temperature rises and enters heat exchanger 6 to exchange heat with the hot water sent from the top of the hot water tank. After the heat exchange, the hot water is pumped back to the middle and lower area of ​​the hot water tank. After the gas temperature rises, it enters heat exchanger 3 to exchange heat with the gas at the outlet of compressor 1, further increasing its temperature. It then enters compressor 1 to be heated and pressurized, completing a storage cycle.

[0051] In the embodiment of the present application, by providing a first heat storage tank, a second heat storage tank, a cold storage tank and multiple energy storage heat exchangers, the electric energy generated by the wind and solar energy supply system is converted into heat energy of the first heat storage tank, heat energy of the second heat storage tank, and cold energy of the heat storage tank in sequence, and temperature regulation and energy recovery are achieved through the water temperature of different height areas in the hot water tank, which facilitates the subsequent realization of zero-carbon energy supply.

[0052] In one embodiment, Figure 2 As shown, the energy storage system further includes a first flow regulating valve and a second flow regulating valve;

[0053] The first flow regulating valve is connected between the fourth heat exchanger and the hot water tank; the second flow regulating valve is connected between the sixth heat exchanger and the hot water tank.

[0054] Specifically, if Figure 2 As shown, a first flow regulating valve should be installed on the cold water inlet pipe of the heat exchanger 4 to adjust the cooling water flow according to the feedback of the turbine 1 inlet temperature signal. After the cooling water is heated, it is pumped back to the upper hot side of the hot water tank through the water pump. After the gas medium comes out of the fourth heat exchanger, it enters the turbine 1 for rotation, thereby adjusting the temperature of the turbine 1 inlet, which can save some compression work.

[0055] A second flow regulating valve is provided on the hot water inlet pipe of the heat exchanger 6 to control the outlet temperature of the gas working medium by adjusting the flow rate, so that the temperature of the gas working medium matches the design temperature of the heat exchanger 3. At the same time, the temperature of the gas working medium flowing into the compressor 1 through the heat exchanger 3 is ensured to be stable at the design value, thereby improving the operating stability of the multi-energy coupling system.

[0056] It should be noted that the dispatching center can read the turbine 1 inlet temperature, make a difference between it and the design temperature, and then enter the PID control adjustment module to adjust the cold water valve position; if the temperature is too high, increase the valve position to increase the cold water flow, and if the temperature is too low, reduce the valve position to reduce the cold water flow; the benefit of the adjustment is to keep the turbine 1 inlet temperature stable at the design operating conditions. Similarly, the dispatching center can also read the gas temperature in the heat exchanger 6, make a difference between it and the design temperature, and then enter the PID control adjustment module to adjust the cold water valve position; if the temperature is too high, increase the valve position to increase the cold water flow, and if the temperature is too low, reduce the valve position to reduce the cold water flow; the benefit of the adjustment is to ensure that the temperature of the gas working medium flowing into the compressor 1 through the heat exchanger 3 is stable at the design value, thereby improving the operating stability of the multi-energy coupling system.

[0057] In the embodiment of the present application, a first flow regulating valve and a second flow regulating valve are provided to respectively adjust the inlet temperature of the first turbine and the inlet temperature of the first compressor, thereby improving the operating stability of the multi-energy coupling system.

[0058] In one embodiment, the refrigeration heat exchanger includes a seventh heat exchanger;

[0059] The liquid working medium in the generator exchanges heat with the heat storage working medium in the second heat storage tank. The liquid working medium in the generator is vaporized into gaseous working medium and returns to the generator through the condenser, throttle valve, evaporator, absorber and seventh heat exchanger in sequence. The liquid in the generator exchanges heat with the liquid at the absorber outlet through the seventh heat exchanger and then returns to the absorber.

[0060] Specifically, if Figure 2As shown, with thermal energy stored in the medium-temperature thermal storage tank, a pump at the top of the tank delivers heat medium to the generator for heat exchange, heating the lithium bromide solution in the generator before returning it to the bottom of the medium-temperature thermal storage tank. After the lithium bromide solution in the generator is heated, water evaporates and enters the condenser, where it is cooled by cold water from the bottom of the hot water tank. After being reduced in pressure by a throttle valve, it flows to the evaporator. Hot chilled water in the evaporator enters the evaporator from the top of the chilled water tank, converting the low-pressure water into steam. The steam then enters the absorber, where it releases heat and cools down to 3-7°C chilled water, which is then stored at the bottom of the chilled water tank. After entering the absorber, the water vapor mixes with the concentrated lithium bromide solution from the bottom of the generator, becoming a dilute lithium bromide solution, which is also cooled by cold water from the hot water tank. The cold lithium bromide dilute solution is pumped to the generator by the working fluid pump, during which it exchanges temperature with the hot lithium bromide concentrated solution from the generator through the heat exchanger 7, thereby raising the temperature; the lithium bromide dilute solution is heated in the generator, the temperature rises, the solubility increases, and at the same time, the water is evaporated into water vapor, completing a refrigeration cycle.

[0061] In the embodiment of the present application, the refrigeration cycle converts the heat of the second heat storage tank into cold energy in the chilled water tank, and at the same time uses the hot water tank for cooling and heat recovery for air conditioning and refrigeration, thereby achieving zero-carbon energy supply.

[0062] In one embodiment, the refrigeration system further includes a throttle valve connected between the condenser and the evaporator.

[0063] Specifically, a throttle valve is provided between the condenser and the evaporator to reduce the pressure, thereby facilitating the subsequent vaporization of low-pressure water into water vapor and entering the absorber.

[0064] In one embodiment, Figure 2 As shown, the energy-releasing heat exchanger includes an eighth heat exchanger, a ninth heat exchanger, a tenth heat exchanger, an eleventh heat exchanger, a twelfth heat exchanger, and a thirteenth heat exchanger;

[0065] The gaseous working medium in the second compressor is sequentially transmitted to the second turbine through the eighth heat exchanger, the ninth heat exchanger, the tenth heat exchanger and the eleventh heat exchanger. The gaseous working medium in the second turbine is sequentially transmitted to the second compressor through the tenth heat exchanger, the twelfth heat exchanger and the thirteenth heat exchanger. The eighth heat exchanger exchanges heat with the hot water tank, the ninth heat exchanger exchanges heat with the second heat storage tank, the tenth heat exchanger exchanges heat with the second compressor and the second turbine respectively, the eleventh heat exchanger exchanges heat with the first heat storage tank, the twelfth heat exchanger exchanges heat with the hot water tank, and the thirteenth heat exchanger exchanges heat with the cold storage tank.

[0066] Specifically, if Figure 2As shown, when the power load increases, the switch on the left side of generator G closes, the switch on the left side of motor M opens, and the multi-energy coupling system enters discharge mode. Simultaneously, the valves on the energy storage side of the high-temperature heat storage tank, medium-temperature heat storage tank, low-temperature cold storage tank, and hot water tank close, while the valves on the energy release side open. The gas at the outlet of compressor 2 enters heat exchanger 8, where it exchanges heat with hot water from the top of the hot water tank, increasing its temperature. The hot water cools down after the heat exchange and is returned to the bottom of the hot water tank. After being heated by heat exchanger 8, the gas enters heat exchanger 9, where it exchanges heat with the heat storage medium from the medium-temperature heat storage tank, absorbing heat energy from the medium-temperature heat storage tank, raising its temperature. The gas then enters heat exchanger 10, where it exchanges heat with the gas at the outlet of turbine 2, increasing its temperature. It then enters heat exchanger 11, where it exchanges heat with the working medium in the high-temperature heat storage tank, absorbing heat energy from the high-temperature heat storage tank, increasing its temperature. The gas then enters turbine 2 to generate electricity. Turbine 2 is coaxially connected to compressor 2, driving compressor 2 to rotate. After turbine 2 performs work, the gas temperature and pressure decrease. It then enters heat exchanger 10, where it exchanges heat with the outlet gas from compressor 2, lowering its temperature. It then enters heat exchanger 12, where it exchanges heat with the cold water in the hot water tank. After exchanging heat with the cold water, the gas returns to the hot side of the hot water tank. After cooling in heat exchanger 12, the gas enters heat exchanger 13, where it exchanges heat with the working fluid in the low-temperature cold storage tank, absorbing cold energy and lowering its temperature. The cold storage fluid then absorbs heat and returns to the top of the cold storage tank. After passing through heat exchanger 13, the gas enters compressor 2, where it is heated and pressurized by compressor 2 before entering heat exchanger 8, completing the energy release cycle.

[0067] In the embodiment of the present application, the heat energy of the first heat storage tank, the heat energy of the second heat storage tank, and the cold energy of the cold storage tank are converted into mechanical energy of the second compressor and the second turbine to generate electricity. At the same time, the water in the hot water tank is energy recovered and the temperature is adjusted. All energy comes from renewable energy and the energy is converted into each other, thereby achieving zero-carbon energy supply.

[0068] In one embodiment, the energy release system further includes a third flow regulating valve, a fourth flow regulating valve and a fifth flow regulating valve;

[0069] The third flow regulating valve is connected between the eighth heat exchanger and the hot water tank; the fourth flow regulating valve is connected between the twelfth heat exchanger and the hot water tank; the fifth flow regulating valve is connected between the second turbine and the eleventh heat exchanger.

[0070] Specifically, a third flow regulating valve is provided on the hot water pipe between the heat exchanger 8 and the hot water tank to adjust the gas outlet temperature of the heat exchanger 8. A fourth flow regulating valve is provided on the cold water pipe between the heat exchanger 12 and the hot water tank to adjust the gas outlet temperature of the heat exchanger 12. A fifth flow regulating valve is provided on the pipe between the turbine 2 and the heat exchanger 11 (the inlet pipe of the turbine 2) to adjust the gas inlet temperature of the turbine 2, so that the temperature is stabilized at the designed operating conditions, thereby ensuring the operating efficiency, safety and stability of the multi-energy coupling system.

[0071] In one embodiment, Figure 2 As shown, the wind and solar energy supply system includes photovoltaic mirror fields, wind farms and solar thermal mirror fields;

[0072] The photovoltaic mirror field and the wind farm are both connected to the busbar, and the first compressor and the first turbine are respectively connected to the busbar;

[0073] The photothermal mirror field is connected to the hot water tank.

[0074] Specifically, if Figure 2 As shown, the photovoltaic mirror field converts solar energy into electrical energy, converts direct current into alternating current through the converter, then boosts the voltage through the transformer, and then sends the electricity to the segmented bus through the switch.

[0075] The electricity generated by the wind turbines in the wind farm is boosted by the transformer and then sent to the segmented bus through the switch.

[0076] In a solar thermal field, solar energy is converted into thermal energy, which is then heated and stored in a hot water tank. Cold water flows from the bottom of the hot water tank, passes through a water pump, and reaches the solar thermal field. After absorbing solar energy and heating it, it returns to the hot water tank from the top. Besides water, the heat storage medium can also be a medium with an operating temperature range of 0-100 degrees Celsius.

[0077] It should be noted that the hot water tank, high-temperature heat storage tank, medium-temperature heat storage tank, low-temperature cold storage tank, and chilled water tank described above all use single tanks. Utilizing the physical phenomenon that medium density decreases with increasing temperature, the high-temperature medium is distributed at the top of the tank and the low-temperature medium at the bottom, forming a temperature gradient between the high and low temperatures. Dual tanks, one high-temperature and one low-temperature, can also be used. The campus power supply is connected to the busbar via a switch. The high-temperature heat storage tank provides heat energy at 300-500°C and exchanges heat with the steam generator to produce high-temperature steam for industrial use within the campus. The medium-temperature heat storage tank provides heat energy at 150-250°C and exchanges heat with the steam generator to produce medium- and low-temperature steam for industrial use within the campus. The hot water tank provides heat energy at 60-100°C and can be used for campus heating or low-temperature water heating. The chilled water tank provides chilled water at 3-7°C for campus air conditioning and cooling. The low-temperature cold storage tank provides cold energy at -100-0°C for the campus cold chain and other low-temperature scenarios.

[0078] In an exemplary embodiment, Figure 3 As shown, a control method for a multi-energy coupling system is provided. The control method is applied to the multi-energy coupling system as described above, and the method includes:

[0079] S302: When it is detected that the power load is reduced, the first compressor and the first turbine are controlled to enter the operating state.

[0080] S304: When it is detected that the power load increases, the second compressor and the second turbine are controlled to enter an operating state.

[0081] Specifically, the multi-energy coupling system can be controlled by a dispatching center. If connected to the main grid, the load is determined by dispatching instructions from the dispatching center. If the microgrid is operating in an isolated network, the load is determined by the load of the devices currently connected to the grid. The load changes in real time with the number of connected devices. There are peak and valley periods in electricity consumption every day. When the power load is lower than the average value for a certain period, it is considered a valley period (low power load); when the power load is higher than the average value for a certain period, it is considered a peak period (high power load).

[0082] For example, upon detecting a decrease in power load, the dispatch center adjusts the speed of the electric motor on the first compressor side according to the load reduction and peak shaving instructions issued by the power grid to match the power load to be absorbed. Upon detecting an increase in power load, the dispatch center controls the second compressor and the second turbine to enter operation and, based on the load call instructions issued by the power grid, adjusts the fifth flow control valve at the inlet of the second turbine to adjust the inlet gas flow of the second turbine, thereby adjusting the power generation to match the load instruction.

[0083] It should be noted that the pumps in the multi-energy coupling system all utilize variable frequency pumps. Their speed is adjusted based on the flow rate of the working fluid through the first compressor, first turbine, second compressor, and second turbine, maintaining the system's operating temperature within a reasonable range despite load fluctuations. The flow control valves in the system regulate the flow rates of the heat storage tank, cold storage tank, and hot water tank based on the flow rate of the working fluid through the first compressor, first turbine, second compressor, and second turbine, maintaining the system's operating temperature within a reasonable range.

[0084] It should be understood that, although the various steps in the flowcharts involved in the various embodiments described above are displayed in sequence according to the instructions of the arrows, these steps are not necessarily performed in sequence in the order indicated by the arrows. Unless clearly stated herein, the execution of these steps is not strictly limited in order, and these steps can be performed in other orders. Moreover, at least a portion of the steps in the flowcharts involved in the various embodiments described above may include multiple steps or multiple stages, and these steps or stages are not necessarily performed at the same time, but can be performed at different times, and the execution order of these steps or stages is not necessarily performed in sequence, but can be performed in turn or alternately with at least a portion of the steps or stages in other steps or other steps. It is understandable that the various steps in different embodiments can be freely combined as needed, and the various non-contradictory schemes formed by the combination all fall within the scope of protection of this application.

[0085] Based on the same inventive concept, embodiments of the present application also provide a control device for a multi-energy coupling system for implementing the aforementioned control method for a multi-energy coupling system. The solution provided by this device is similar to the solution described in the aforementioned method. Therefore, the specific limitations of one or more embodiments of the control device for a multi-energy coupling system provided below can be found in the aforementioned limitations of the control method for a multi-energy coupling system, and will not be further elaborated here.

[0086] In an exemplary embodiment, a control device for a multi-energy coupling system is provided, comprising:

[0087] a first control module, configured to control the first compressor and the first turbine to enter an operating state when a reduction in power load is detected;

[0088] The second control module is configured to control the second compressor and the second turbine to enter an operating state when an increase in the electric load is detected.

[0089] Each module in the control device of the multi-energy coupling system can be implemented in whole or in part through software, hardware, or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in the computer device in the form of software, so that the processor can call and execute the corresponding operations of each module.

[0090] In an exemplary embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as shown in FIG. Figure 4 As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, abbreviated as I / O) and a communication interface. The processor, memory and input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and computer program in the non-volatile storage medium. The database of the computer device is used to store power load data for each time period. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a control method for a multi-energy coupling system is implemented.

[0091] Those skilled in the art will understand that Figure 4The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0092] In an exemplary embodiment, a computer device is provided, including a memory and a processor. The memory stores a computer program, and the processor implements the control method of the multi-energy coupling system when executing the computer program.

[0093] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the control method of the multi-energy coupling system is implemented.

[0094] In one embodiment, a computer program product is provided, comprising a computer program, which implements the control method of the multi-energy coupling system when executed by a processor.

[0095] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0096] Those skilled in the art will understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. In particular, any reference to memory, database, or other media used in the embodiments provided in this application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The databases involved in the various embodiments provided herein may include at least one of a relational database and a non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the various embodiments provided herein may be, but are not limited to, general-purpose processors, central processing units (CPUs), graphics processing units (GPUs), digital signal processors (DSPs), programmable logic devices (PLDs), quantum computing-based data processing logic devices, artificial intelligence (AI) processors, and the like.

[0097] The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0098] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A multi-energy coupling system, characterized in that: The system includes a wind-solar energy supply system, an energy storage system, a refrigeration system and an energy release system, wherein the energy storage system is respectively connected to the wind-solar energy supply system, the refrigeration system and the energy release system, and the energy release system is respectively connected to the wind-solar energy supply system and the refrigeration system; The energy storage system includes a first compressor, a first turbine, a heat storage tank, a cold storage tank, a hot water tank, and an energy storage heat exchanger, wherein the wind-solar energy supply system is connected to the first compressor and the first turbine respectively, the gas working medium in the first compressor circulates with the gas working medium in the first turbine through the energy storage heat exchanger, and the energy storage heat exchanger exchanges heat with the heat storage tank, the cold storage tank, and the hot water tank respectively; The refrigeration system includes a generator, a condenser, an evaporator, an absorber, a chilled water tank, a refrigeration heat exchanger and a throttle valve, wherein the generator is connected to the heat storage tank, the liquid working medium in the generator exchanges heat with the heat storage working medium in the heat storage tank, the liquid working medium in the generator is vaporized into a gas working medium, and is converted into a liquid through the condenser, and then sequentially passes through the throttle valve and the evaporator to be converted into a gas, and then sequentially passes through the absorber and the refrigeration heat exchanger to return to the generator, the liquid in the generator passes through the refrigeration heat exchanger to exchange heat with the liquid at the absorber outlet and then returns to the absorber, the evaporator exchanges heat with the chilled water tank, and the condenser and the absorber exchange heat with the hot water tank respectively; The energy release system includes a second compressor, a second turbine and an energy release heat exchanger, wherein the gaseous working medium in the second compressor circulates with the gaseous working medium in the second turbine through the energy release heat exchanger, and the energy release heat exchanger exchanges heat with the heat storage tank, the cold storage tank and the hot water tank respectively.

2. The system according to claim 1, wherein: The heat storage tank includes a first heat storage tank and a second heat storage tank, wherein the temperature range corresponding to the heat storage medium in the first heat storage tank is greater than the temperature range corresponding to the heat storage medium in the second heat storage tank; the energy storage heat exchanger includes a first heat exchanger, a second heat exchanger, a third heat exchanger, a fourth heat exchanger, a fifth heat exchanger and a sixth heat exchanger; The gaseous working medium in the first compressor is sequentially transferred to the first turbine through the first heat exchanger, the second heat exchanger, the third heat exchanger, and the fourth heat exchanger. The gaseous working medium in the first turbine is sequentially transferred to the first compressor through the fifth heat exchanger, the sixth heat exchanger, and the third heat exchanger. The first heat exchanger exchanges heat with the first heat storage tank, the second heat exchanger exchanges heat with the second heat storage tank, the third heat exchanger exchanges heat with the first compressor and the first turbine respectively, the fourth heat exchanger exchanges heat with the hot water tank, the fifth heat exchanger exchanges heat with the cold storage tank, and the sixth heat exchanger exchanges heat with the hot water tank.

3. The system according to claim 2, characterized in that The energy storage system further includes a first flow regulating valve and a second flow regulating valve; The first flow regulating valve is connected between the fourth heat exchanger and the hot water tank; the second flow regulating valve is connected between the sixth heat exchanger and the hot water tank.

4. The system according to claim 2, wherein: The refrigeration heat exchanger includes a seventh heat exchanger; The liquid working medium in the generator exchanges heat with the heat storage working medium in the second heat storage tank. The liquid working medium in the generator is vaporized into a gaseous working medium and returns to the generator through the condenser, the throttle valve, the evaporator, the absorber and the seventh heat exchanger in sequence. The liquid in the generator exchanges heat with the liquid at the absorber outlet through the seventh heat exchanger and then returns to the absorber.

5. The system according to claim 4, characterized in that The refrigeration system further includes a throttle valve connected between the condenser and the evaporator.

6. The system according to claim 2, wherein: The energy-releasing heat exchanger includes an eighth heat exchanger, a ninth heat exchanger, a tenth heat exchanger, an eleventh heat exchanger, a twelfth heat exchanger, and a thirteenth heat exchanger; The gaseous working medium in the second compressor is sequentially transferred to the second turbine through the eighth heat exchanger, the ninth heat exchanger, the tenth heat exchanger and the eleventh heat exchanger, and the gaseous working medium in the second turbine is sequentially transferred to the second compressor through the tenth heat exchanger, the twelfth heat exchanger and the thirteenth heat exchanger. The eighth heat exchanger exchanges heat with the hot water tank, the ninth heat exchanger exchanges heat with the second heat storage tank, the tenth heat exchanger exchanges heat with the second compressor and the second turbine respectively, the eleventh heat exchanger exchanges heat with the first heat storage tank, the twelfth heat exchanger exchanges heat with the hot water tank, and the thirteenth heat exchanger exchanges heat with the cold storage tank.

7. The system according to claim 6, characterized in that The energy release system further includes a third flow regulating valve, a fourth flow regulating valve and a fifth flow regulating valve; The third flow regulating valve is connected between the eighth heat exchanger and the hot water tank; the fourth flow regulating valve is connected between the twelfth heat exchanger and the hot water tank; and the fifth flow regulating valve is connected between the second turbine and the eleventh heat exchanger.

8. The system according to any one of claims 1 to 7, characterized in that The wind and solar energy supply system includes a photovoltaic mirror field, a wind farm and a solar thermal mirror field; The photovoltaic mirror field and the wind farm are both connected to a busbar, and the first compressor and the first turbine are respectively connected to the busbar; The photothermal mirror field is connected to the hot water tank.

9. A control method for a multi-energy coupling system, characterized in that: The control method is applied to the multi-energy coupling system according to any one of claims 1 to 7, and the method includes: When a reduction in power load is detected, controlling the first compressor and the first turbine to enter an operating state; When an increase in the electric load is detected, the second compressor and the second turbine are controlled to enter an operating state.

10. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to claim 9 are implemented.

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