Wind-solar driven cooling heating and power integrated energy system and operation method thereof

Abstract

The invention discloses a wind-solar-driven cooling, heating and power comprehensive energy system and an operation method thereof, and aims to solve the problems that in the prior art, the comprehensive utilization rate of solar energy and wind energy is low, waste heat is not effectively utilized, and multi-energy complementation is lacked. According to the invention, a Carnot cell system and energy storage equipment are combined, efficient conversion from solar energy and wind energy to heat energy and electric energy is realized by utilizing a photovoltaic and photo-thermal integrated plate and a wind turbine, and waste heat is deeply coupled with a charging and discharging process; in the charging stage, off-peak electricity is used for driving a compressor to heat waste heat, the waste heat is stored in the heat storage unit and the heat supply unit after being heated, and meanwhile cold energy is released to the cold storage unit; in the discharging stage, the working medium absorbs heat to drive power generation equipment to supply power and absorbs cold energy from the cold storage unit, cold, heat and electricity multi-energy complementation is achieved, the recycling efficiency of waste heat and the cold energy and the comprehensive utilization rate of renewable energy sources are improved, the power grid load is balanced, the operation cost is reduced, and development and wide application of green energy sources are promoted; and a new scheme is provided for efficient utilization of renewable energy sources.

Description

Technical Field

[0001] The present invention relates to the field of thermal power and renewable energy utilization technology, and in particular to a wind-solar-driven cold, heat and electricity integrated energy system and an operation method thereof. Background Art

[0002] Energy conservation, emission reduction and efficient use of renewable energy have become the core driving force for the development of the energy sector. As renewable energy sources with huge reserves and no pollution, the development and utilization of solar energy and wind energy are of great significance to promoting the optimization of energy structure and sustainable development.

[0003] At present, the utilization of solar energy is mainly through photovoltaic modules to convert light energy into electrical energy, or through photothermal technology to convert it into thermal energy. Photothermal technology has become one of the mainstream ways of utilizing solar energy due to its maturity and wide application. Photothermal technology has shown unique advantages in the fields of thermal energy supply and hot water preparation. In terms of wind energy, wind turbines, as key equipment for wind energy conversion, use wind power to drive the turbine to rotate, thereby driving the generator to generate electricity. With the advancement of technology, wind turbines are developing in the direction of large capacity and high efficiency.

[0004] In terms of the comprehensive utilization of renewable energy, a variety of technical solutions have been proposed and applied in practice. For example, CN114508869B discloses a solar-wind coupled cooling-power cogeneration energy system, which achieves the initial coupling of solar energy and wind energy in cooling-power cogeneration by integrating components such as solar photovoltaic panels, wind turbines, and cooling-power cogeneration devices. However, the system still needs to be improved in terms of heat recovery and utilization, the flexibility of multi-energy complementarity, and the overall energy efficiency of the system.

[0005] In addition, CN109764576A proposes a multi-energy complementary integrated energy system for combined cooling, heating and power and its operation method. The system further expands the means of absorbing renewable energy through the deep complementary coupling of solar energy and gas trigeneration systems, and photovoltaic power generation drives heat pumps as another heat source. While ensuring the stability and reliability of energy supply in the four major links of power generation, refrigeration, heating and domestic hot water, the system also demonstrates the potential of multi-energy complementary integrated energy systems in improving the overall energy efficiency of the system. However, the system still has certain limitations in the deep utilization of wind energy, especially the recovery and utilization of wind energy waste heat.

[0006] Meanwhile, CN116451954A discloses a combined cooling, heating and power complementary integrated energy management system, which realizes the integrated management and optimal scheduling of three kinds of energy, namely cooling, heating and electricity, through centralized multi-energy interconnection and regulation. This system performs excellently in improving energy utilization efficiency, reducing energy costs and carbon emissions, but there is still room for improvement in the immediate response, dynamic adjustment of renewable energy and its deep integration with other energy forms.

[0007] Although certain progress has been made in the utilization of wind energy and solar energy and the multi-energy complementary integrated energy system in the prior art, there are still many deficiencies: (1) Lack of deep coupling and system integration: Most of the existing systems focus on the realization of a single energy form or function, lacking the deep coupling and system integration among wind energy, solar energy and other energy forms. This results in low energy utilization efficiency and inability to meet the immediate response of users' diversified energy demands.

[0008] (2) Insufficient utilization of wind energy waste heat: As wind turbines develop towards large-capacity, the internal mechanical friction heat generated during their operation becomes a problem that cannot be ignored. However, most of the prior art does not consider the effective utilization of this part of low-grade heat energy, restricting the comprehensive utilization efficiency of wind energy.

[0009] (3) Lack of flexibility and synergy in multi-energy complementarity: When the existing systems realize multi-energy complementarity of cooling, heating and power, they often lack sufficient flexibility and synergy. The system is difficult to dynamically adjust the energy supply strategy according to external environmental changes and user demands, leading to energy waste and low efficiency.

[0010] (4) Limited intelligent control and optimal scheduling capabilities: Although some systems introduce intelligent control technologies, their optimal scheduling capabilities are still insufficient when facing complex and changing energy supply and demand environments and user demands. This restricts the improvement of the overall energy efficiency of the system and the maximum utilization of renewable energy.

[0011] (5) Cost and economic problems: Some multi-energy complementary integrated energy systems face high costs and economic challenges during construction and operation. The high investment costs and operating expenses limit the wide application and promotion of these systems.

[0012] In summary, although certain achievements have been made in the utilization of wind energy and solar energy and the multi-energy complementary integrated energy system in the prior art, there are still obvious deficiencies in aspects such as the comprehensive utilization of energy, heat energy recovery, flexibility and synergy of multi-energy complementarity, intelligent control and optimal scheduling capabilities, and cost and economy. Therefore, there is an urgent need for an innovative technical solution to solve the problems existing in the prior art, improve the comprehensive utilization rate of renewable energy, and promote the optimization and sustainable development of the energy structure. Summary of the Invention

[0013] The technical problem to be solved by the present invention is to provide a combined cooling, heating and power integrated energy system driven by wind and light and its operation method, and solve the core problems existing in the utilization of renewable energy such as solar energy and wind energy, including low comprehensive utilization rate, serious waste of wind energy waste heat, and insufficient multi-energy complementary utilization. Specifically, at present, solar energy and wind energy occupy an important position in the field of renewable energy, but there are still many challenges in the efficient coordination of multiple links such as power generation, energy storage and heat recovery. Most of the existing technologies focus on the realization of a single energy form or function, lacking the deep coupling and system integration between wind energy, solar energy and other energy forms, resulting in low energy utilization efficiency and inability to meet the immediate response of users' diversified energy demands. At the same time, as low-grade heat energy, the effective utilization of wind energy waste heat has not been properly solved, further restricting the comprehensive utilization efficiency of wind energy.

[0014] To solve the above technical problems, the technical solution adopted by the present invention is: a combined cooling, heating and power integrated energy system driven by wind and light, including a waste heat unit for collecting the waste heat generated during the operation of a photovoltaic-thermal integrated panel and a wind turbine, a cold storage unit for releasing heat and absorbing cold in the charging stage and releasing cold in the discharging stage, a heat storage unit for absorbing, transferring and storing heat in the charging stage and releasing heat in the discharging stage, and a power supply unit for converting thermal energy into electrical energy in the discharging stage. They are connected through a charging circuit and a discharging circuit. In the charging stage, the compressor is driven by off-peak electricity to heat up the waste heat of the waste heat unit, and part of the heat is stored in the heat storage unit, and part of the heat is used for heating by the heating unit, and at the same time, cold is released to the cold storage unit; in the discharging stage, the working medium absorbs heat to drive the generator to supply power and absorbs cold from the cold storage unit.

[0015] In a preferred embodiment, the waste heat unit includes a first circulation pump and a second circulation pump, which are respectively connected to a heat exchanger and a photovoltaic-thermal integrated panel. The heat-carrying fluid is divided into two paths at the four-way valve. One path enters the heat exchanger through the first circulation pump to absorb frictional heat from the wind turbine, and the other path is transported to the photovoltaic-thermal integrated panel through the second circulation pump to absorb waste heat. The two fluids converge at the four-way valve to provide heat support for the subsequent process. The four-way valve is used to control the diversion and convergence of the heat-carrying fluid.

[0016] In a preferred embodiment, the direct current generated by the photovoltaic-thermal integrated panel is converted into alternating current through an inverter and connected to the municipal power grid, and the wind power generated by the wind turbine is directly connected to the municipal power grid.

[0017] In a preferred embodiment, the cold energy storage unit includes a high-parameter cold storage tank and a low-parameter cold storage tank. During the charging process, the low-temperature water in the high-parameter cold storage tank is transported by a high-parameter cold water pump to the preheater to release heat and absorb the cold energy released by the circulating working fluid in the charging circuit, and then flows into the low-parameter cold storage tank for storage. During the discharging process, the cold water in the low-parameter cold storage tank is transported by a low-parameter cold water pump to the condenser to transfer cold energy, and then is transported back to the high-parameter cold storage tank for storage.

[0018] In a preferred embodiment, the heat storage unit includes a low-temperature water tank and a high-temperature water tank. During the charging process, the low-temperature water in the low-temperature water tank is transported by a low-temperature water pump to the cooler on the water tank side to absorb heat, and then flows into the high-temperature water tank for storage. During the discharging process, the high-temperature water in the high-temperature water tank is transported by a high-temperature water pump to the heater on the water tank side to transfer heat, and then is transported back to the low-temperature water tank for storage.

[0019] In a preferred embodiment, the heat supply unit includes a return water tank and a hot water tank. During the charging process, the normal-temperature water in the return water tank is transported by a normal-temperature water pump to the cooler on the water tank side to absorb heat, and then flows into the hot water tank for storage. When there is a demand for domestic hot water from users, the hot water in the hot water tank is transported by a hot water pump to the users. The return water with reduced temperature after being used by the users is transported back to the return water tank for storage.

[0020] In a preferred embodiment, the charging circuit includes a first waste heat side heater, a compressor, a cooler on the water tank side, a cooler on the water tank side, a first turbine, and a preheater. They are sequentially connected by pipelines to form a closed loop. During the low electricity consumption period, the circulating working fluid flows through the preheater to exchange heat with the low-temperature water in the high-parameter cold storage tank, then enters the first waste heat side heater to absorb waste heat, then enters the compressor to be compressed into a high-temperature and high-pressure working fluid, and then sequentially flows through the cooler on the water tank side and the cooler on the water tank side to exchange heat, and finally enters the first turbine to expand and do work to drive the first generator to generate electric energy. The compressor is connected to an electric motor.

[0021] In a preferred embodiment, the discharging circuit includes a heater on the water tank side, a second turbine, a generator, a condenser, a liquid storage tank, a working fluid pump, and a second waste heat side heater. They are sequentially connected by pipelines to form a closed loop. During the high electricity consumption period, the circulating working fluid is driven by the working fluid pump. First, it enters the second waste heat side heater to absorb waste heat, then flows into the heater on the water tank side to absorb the heat of the high-temperature water, then enters the second turbine to expand and do work to drive the second generator to generate electric energy. The expanded working fluid enters the condenser to release the remaining heat and complete condensation. The condensed working fluid is stored in the liquid storage tank for the next cycle.

[0022] An operation method of a wind-solar-driven integrated cooling, heating, and power energy system is a method for operating the above-mentioned wind-solar-driven integrated cooling, heating, and power energy system, including the following steps: Step1: During the charging stage, the compressor is driven to operate using off-peak electricity. Step2: The waste heat generated during the operation of the photovoltaic-thermal integrated panel and the wind turbine is transferred to the preheater through the heat-carrying fluid to preheat the working medium. Step3: The preheated working medium enters the compressor, where it is compressed and heated up. Step4: The heated working medium successively passes through the cooler on the water tank side and the cooler on the water tank side, transferring part of the heat to the low-temperature water tank and the hot water tank respectively. At the same time, the cold quantity is released into the high-parameter cold tank of the cold energy storage unit. Step5: The water in the low-temperature water tank absorbs heat, heats up, and is transported to the high-temperature water tank for storage. Step6: During the peak electricity consumption period, the discharge stage is started. The working medium successively passes through the second waste heat side heater, the water tank side heater, and the second turbine, absorbing waste heat and stored heat to drive the second generator to supply power. Step7: During the discharge process, the working medium absorbs cold quantity from the low-parameter cold tank of the cold energy storage unit to maintain the temperature balance within the system. Step8: After the working medium drives the second generator to supply power, the remaining heat is released through the condenser and re-transferred to the cold energy storage unit to achieve the recycling of cold quantity.

[0023] In a preferred embodiment, the method further includes the steps of starting the charging stage during the off-peak electricity consumption period to charge the system, and starting the discharge stage during the peak electricity consumption period to supply power to the outside using the system discharge. The charging and discharging processes are combined with the grid load conditions to achieve flexible storage and release of electric energy, so as to balance the grid load.

[0024] In a preferred embodiment, the charging process in the charging stage of Step1 adopts the reverse Brayton cycle, and the circulating working medium adopts nitrogen or carbon dioxide.

[0025] In a preferred embodiment, in Step2, the preheater preheats the working medium to a temperature suitable for the operation of the compressor. The heat-carrying fluid adopts water or heat-conducting oil to improve the heat conduction efficiency.

[0026] In a preferred embodiment, in Step4, the cooler on the water tank side transfers the heat of the working medium to the water in the hot water tank, and the heated hot water is transported to the user through the hot water pump.

[0027] In a preferred embodiment, the discharge process in Step7 adopts the Rankine cycle or the Brayton cycle, and the circulating working medium adopts organic working medium or carbon dioxide.

[0028] A cold, heat, and power integrated energy system driven by wind and light and its operation method provided by the present invention have the following beneficial effects: 1. The present invention significantly improves the comprehensive utilization rate of solar energy and wind energy by deeply coupling a photovoltaic-thermal integrated panel and a wind turbine, combining a Carnot battery system and an energy storage device, solves the core problems in the utilization of renewable energy in the prior art, such as low comprehensive utilization rate, serious waste of wind energy waste heat, and insufficient multi-energy complementary utilization, and promotes the development and wide application of green energy.

[0029] 2. The present invention constructs a comprehensive energy system with multi-energy complementarity of cold, heat, and electricity. Through the collaborative optimization design of the photovoltaic-thermal integrated panel and the wind turbine, it realizes the efficient conversion of solar energy and wind energy into electric energy and heat energy, significantly improves the system operation efficiency, and meets the immediate response of users to diversified energy demands.

[0030] 3. During the charging stage, the present invention uses off-peak electricity to heat up and store the waste heat generated by the photovoltaic-thermal integrated panel and the wind turbine, and during the peak electricity consumption period, it converts the waste heat and the stored heat energy into electric energy output through a discharge circuit, realizing the flexible storage and release of energy; at the same time, through a flexible charge-discharge strategy, the system stores excess electric energy and heat energy during off-peak electricity consumption and releases electric energy and heat energy during peak electricity consumption, effectively balancing the power grid load distribution and reducing the impact of the peak-valley difference on the power grid stability.

[0031] 4. The design of the cold storage unit, heat storage unit, and heat supply unit in the system of the present invention further improves the recovery and utilization efficiency of waste heat and cold quantity, solves the problem of waste of wind energy waste heat in the prior art, and improves the comprehensive utilization efficiency of wind energy.

[0032] 5. By making full use of off-peak electricity and waste heat resources, the present invention reduces the system operation cost and external energy consumption, meets the requirements of energy conservation, emission reduction, and sustainable development in modern energy development, and has significant economic value and environmental benefits.

[0033] 6. Through new technical means, the present invention realizes the efficient collaboration of solar energy and wind energy in multiple links such as power generation, energy storage, and heat energy recovery, constructs a cold-heat-electricity integrated energy system driven by wind and light, and provides a new solution for the efficient utilization of renewable energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present invention will be further described below in conjunction with the drawings and embodiments: Figure 1 It is a schematic diagram of the basic layout of the comprehensive energy system of the present invention; Figure 2 It is a schematic diagram of the structure of the comprehensive energy system of the present invention; In the figure: a first circulation pump 1, a heat exchanger 2, a wind turbine 3, a second circulation pump 4, a photovoltaic thermal integrated panel 5, an inverter 6, a first waste heat side heater 7, a compressor 8, a motor 9, a water tank side cooler 10, a water tank side cooler 11, a first turbine 12, a first generator 13, a preheater 14, a high parameter cold tank 15, a high parameter cold water pump 16, a low parameter cold tank 17, a low parameter cold water pump 18, a low temperature water tank 19, a low temperature water pump 20, a high temperature water tank 21, a high temperature water pump 22, a water tank side heater 23, a return water tank 24, a normal temperature water pump 25, a hot water tank 26, a hot water pump 27, a user 28, a second turbine 29, a second generator 30, a condenser 31, a liquid Storage tank 32 , working fluid pump 33 , second waste heat side heater 34 . DETAILED DESCRIPTION

[0035] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments: Example 1 like Figures 1 to 2 As shown, this embodiment describes a wind-solar-driven cold, heat and power integrated energy system and its operation method of the present invention from two aspects: the basic layout of the system and the operation process.

[0036] 1. System composition The present invention proposes a wind-solar-driven cold-heat-electricity integrated energy system. Figure 1 As shown, it mainly includes a waste heat unit, a cold storage unit, a charging circuit, a heat storage unit, a heating unit and a discharge circuit.

[0037] 1. Waste heat unit: It includes a circulation pump 1, a heat exchanger 2, a wind turbine 3, a circulation pump 4, a photovoltaic-thermal integrated panel 5 and an inverter 6; The heat-carrying fluid (such as water or heat-conducting oil) is divided into two paths at the four-way valve: one path enters the heat exchanger 2 through the circulation pump 1, exchanges heat with the high-temperature components in the wind turbine 3, and absorbs the friction heat generated by them; the other path is transported to the photovoltaic thermal integrated panel 5 by the circulation pump 4, and absorbs the residual heat generated by the light on its surface; the two paths of fluid converge at the four-way valve to form a high-temperature fluid, which provides heat support for the subsequent process; The direct current generated by the photovoltaic-thermal integrated panel 5 is converted into alternating current through the inverter 6 and connected to the municipal power grid for power supply; the wind power generated by the wind turbine 3 is also directly connected to the municipal power grid.

[0038] 2. Cold storage unit: It includes a high-parameter cold tank 15, a high-parameter cold water pump 16, a low-parameter cold tank 17 and a low-parameter cold water pump 18; During the charging process, the low-temperature water (such as water close to the ambient temperature) in the high-parameter cold tank 15 is transported by the high-parameter cold water pump 16 to the preheater 14, where it exchanges heat with the circulating working fluid, releases heat and absorbs the cold of the working fluid, and then flows into the low-parameter cold tank 17 for low-temperature storage; During the discharging process, the cold water in the low-parameter cold tank 17 is transported by the low-parameter cold water pump 18 to the condenser 31, where it exchanges heat with the expanded working fluid. After absorbing the cold of the working fluid, the cold water with reduced temperature is transported back to the high-parameter cold tank 15 for recirculation.

[0039] 3. Heat storage unit: It includes a low-temperature water tank 19, a low-temperature water pump 20, a high-temperature water tank 21, and a high-temperature water pump 22; During the charging process, the low-temperature water in the low-temperature water tank 19 is transported by the low-temperature water pump 20 to the water tank side cooler 10, where it exchanges heat with the circulating working fluid. After absorbing the heat of the working fluid, the water with increased temperature flows into the high-temperature water tank 21 for high-temperature storage; During the discharging process, the high-temperature water in the high-temperature water tank 21 is transported by the high-temperature water pump 22 to the water tank side heater 23, where it exchanges heat with the circulating working fluid. After releasing heat, the water with reduced temperature is transported back to the low-temperature water tank 19 for recirculation.

[0040] 4. Heat supply unit: It includes a return water tank 24, a normal temperature water pump 25, a hot water tank 26, a hot water pump 27, and a user water pipeline 28; During the charging process, the normal temperature water in the return water tank 24 is transported by the normal temperature water pump 25 to the water tank side cooler 11, where it exchanges heat with the circulating working fluid. After absorbing the heat of the working fluid, the water with increased temperature flows into the hot water tank 26 for storage; when the user needs domestic hot water, the hot water in the hot water tank 26 is transported by the hot water pump 27 through the user water pipeline 28 to the user. The return water with reduced temperature after the user uses it is transported back to the return water tank 24 for recirculation.

[0041] 5. Charging circuit: It includes a preheater 14, a first waste heat side heater 7, a compressor 8, a motor 9, a water tank side cooler 10, a water tank side cooler 11, a first turbine 12, and a first generator 13; During the low electricity consumption period, the circulating working fluid (such as nitrogen or carbon dioxide) first flows through the preheater 14 and exchanges heat with the low-temperature water in the high-parameter cold tank 15, being preheated to a temperature suitable for the operation of the compressor 8; subsequently, the working fluid enters the first waste heat side heater 7, absorbs the waste heat from the photovoltaic-thermal integrated panel 5 and the wind turbine 3, and its temperature is further increased; then, the working fluid enters the compressor 8 and is compressed by the motor 9 to form a high-temperature and high-pressure working fluid; the compressed working fluid flows through the water tank side cooler 10 and the water tank side cooler 11 in sequence, and exchanges heat with the water in the low-temperature water tank 19 and the hot water tank 26 respectively, releasing part of the heat and reducing the temperature; finally, the working fluid enters the first turbine 12 to expand and do work, driving the first generator 13 to generate electric energy and completing the charging cycle.

[0042] 6. Discharge circuit: It includes the water tank side heater 23, the second turbine 29, the second generator 30, the condenser 31, the liquid CO2 storage tank 32, the working fluid pump 33 and the second waste heat side heater 34; During the high electricity consumption period, the circulating working fluid is driven by the working fluid pump 33 and first enters the second waste heat side heater 34 to absorb the waste heat from the photovoltaic-thermal integrated panel 5 and the wind turbine 3; subsequently, the working fluid flows into the water tank side heater 23 to further absorb the heat of the high-temperature water in the high-temperature water tank 21, and its temperature is significantly increased; then, the high-temperature and high-pressure working fluid enters the second turbine 29 to expand and do work, driving the second generator 30 to generate electric energy and output; the expanded working fluid enters the condenser 31 and exchanges heat with the cold water in the low-parameter cold tank 17, releasing the remaining heat and completing the condensation; the condensed working fluid is stored in the liquid CO2 storage tank 32 and is redriven by the working fluid pump 33 during the next cycle.

[0043] II. Operating process 1. Charging stage: During the low valley electricity period, the system starts the charging mode. After being preheated in the preheater 14, the circulating working fluid enters the first waste heat side heater 7 to absorb waste heat, and its temperature is increased to about 300°C. Subsequently, the working fluid enters the compressor 8 for compression to form a high-temperature and high-pressure working fluid with a pressure of about 10 MPa and a temperature of about 400°C.

[0044] The high-temperature and high-pressure working fluid flows through the water tank side cooler 10 and the water tank side cooler 11 in sequence, and exchanges heat with the water in the low-temperature water tank 19 and the hot water tank 26 respectively. In the water tank side cooler 10, the working fluid releases about 150°C of heat to the water in the low-temperature water tank 19, raising the water temperature to about 90°C; in the water tank side cooler 11, the working fluid releases the remaining heat to the water in the hot water tank 26, raising the water temperature to about 60°C, and at the same time the temperature of the working fluid itself is reduced to about 100°C.

[0045] The cooled working fluid enters the first turbine 12 to expand and do work, driving the first generator 13 to generate electric energy. The temperature of the working fluid at the turbine outlet is about 50°C, and the pressure drops to near atmospheric pressure. Subsequently, it enters the condenser for recirculation or discharge.

[0046] 2. Discharge stage: During peak electricity hours, the system starts the discharge mode. The circulating working fluid is driven by the working fluid pump 33 and first enters the second waste heat side heater 34 to absorb waste heat, and the temperature is raised to about 250°C. Subsequently, the working fluid flows into the water tank side heater 23 to further absorb the heat of the hot water at about 150°C in the high-temperature water tank 21, and the temperature is raised to about 400°C.

[0047] The high-temperature and high-pressure working fluid enters the second turbine 29 to expand and do work, driving the second generator 30 to generate and output electric energy. The temperature of the working fluid at the turbine outlet drops to about 100°C, and the pressure drops to near atmospheric pressure.

[0048] The expanded working fluid enters the condenser 31, exchanges heat with the cold water at about 10°C in the low-parameter cold tank 17, releases the remaining heat and completes condensation. The temperature of the condensed working fluid drops to about 20°C and is stored in the liquid CO2 storage tank 32 for the next cycle. At the same time, after the cold water in the low-parameter cold tank 17 absorbs the cold released by the working fluid, the temperature drops to about 5°C, and then it is transported back to the high-parameter cold tank 15 for recirculation.

[0049] Embodiment 2 In another preferred embodiment, on the basis of Embodiment 1, this embodiment optimizes the design of a cold, heat and power integrated energy system driven by wind and light to improve performance.

[0050] I. System optimization design 1. Optimization of heat exchanger 2: Adopt an efficient heat exchanger 2 to improve the heat exchange efficiency. For example, plate fin heat exchangers 2 are used in the water tank side cooler 10 and the water tank side cooler 11 to increase the heat exchange area and heat transfer coefficient, and improve the heat exchange efficiency between the working fluid and water.

[0051] Optimize the layout of heat exchanger 2 to reduce heat loss. For example, install heat exchanger 2 in a closed space with good heat insulation to reduce heat exchange with the external environment.

[0052] 2. Optimization of compressor 8 and turbine: Adopt an efficient compressor 8 and turbine to improve the energy conversion efficiency. For example, select a centrifugal compressor 8 and a turbine with high isentropic efficiency to reduce energy loss.

[0053] Optimize the operating parameters of compressor 8 and turbine, such as rotational speed, intake pressure, etc., to adapt to the energy conversion requirements under different working conditions.

[0054] 3. Optimization of working medium and cycle mode: Select appropriate working medium and cycle mode according to system requirements. For example, during the charging process, the reverse Brayton cycle and nitrogen are used as the working medium to improve the compression efficiency and heat exchange efficiency; during the discharging process, the Rankine cycle and organic working medium are used as the working medium to improve the expansion efficiency and power generation efficiency.

[0055] Optimize the charging and discharging process of the working medium to reduce energy loss and temperature rise. For example, adopt the method of multi-stage compression and intercooling to reduce the exhaust temperature and power consumption of the compressor.

[0056] II. Performance improvement 1. Improvement of energy utilization efficiency: Improve the energy utilization efficiency by optimizing the system structure and operating parameters. For example, adopt high-efficiency heat exchangers 2 and compressors 8 to improve the heat exchange and compression efficiency; adopt appropriate working medium and cycle mode to improve the expansion and power generation efficiency.

[0057] Recover and utilize the waste heat and cold energy generated in the system to reduce energy waste. For example, use the waste heat generated by the photovoltaic-thermal integrated panel 5 and the wind turbine 3 to heat the circulating working medium and supply hot water; store the cold energy generated during the charging process in the cold storage unit for use during the discharging process.

[0058] 2. Improvement of economy and environmental protection: Use off-peak electricity for charging operations to reduce the system operation cost. For example, start the charging mode at night or during off-peak electricity consumption periods to store and convert energy using cheap off-peak electricity.

[0059] Reduce the use of fossil energy and carbon emissions. For example, by increasing the utilization rate of renewable energy and energy utilization efficiency, reduce the dependence on traditional fossil energy and carbon emissions.

[0060] Embodiment 3 In another preferred embodiment, based on Embodiments 1 and 2, this embodiment describes the flexible application of a wind-solar-driven integrated cooling, heating and power energy system of the present invention under different working conditions and different user requirements.

[0061] I. Applications under different seasonal working conditions 1. Summer working condition: During high-temperature periods in summer, the system can make more use of the cold energy in the cold storage unit for refrigeration or cooling services. For example, cool the cold water in the low-parameter cold tank 17 through a refrigeration unit or air-conditioning system and supply it to the user 28; or directly transport the cold water to the equipment or space that needs to be cooled for temperature reduction.

[0062] Meanwhile, the system can continue to generate electricity and provide hot water services by utilizing the waste heat generated by the photovoltaic-thermal integrated panel 5 and the wind turbine 3. For example, during the daytime with sufficient sunlight, the photovoltaic-thermal integrated panel 5 is activated to generate electricity and provide hot water; during the period with strong wind, the wind turbine 3 is activated to generate electricity.

[0063] 2. Winter condition: During the low-temperature period in winter, the system can make more use of the hot water in the heating unit for heating services. For example, the hot water in the hot water tank 26 is transported through the heating pipeline to the indoor of user 28 for heating; or the hot water is used to heat the water in places such as swimming pools and bathrooms.

[0064] Meanwhile, the system can continue to utilize the waste heat generated by the photovoltaic-thermal integrated panel 5 and the wind turbine 3 to generate electricity and store heat. For example, during the daytime with sufficient sunlight, the photovoltaic-thermal integrated panel 5 is activated to generate electricity and store heat; during the period with strong wind, the wind turbine 3 is activated to generate electricity and store it in the battery for nighttime use.

[0065] II. Applications under the demands of different users 28 1. Residential users 28: For residential users 28, the system can provide domestic hot water, heating, and cooling services. For example, in summer, cold water is transported to residential homes for cooling; in winter, hot water is transported to residential homes for heating; and domestic hot water services are provided throughout the year.

[0066] The system can also perform flexible charge and discharge operations according to the electricity demand of residential users. For example, during the peak period of residential electricity consumption, the discharge mode is activated to provide power support for residential users; during the low valley period of residential electricity consumption, the charging mode is activated to store energy.

[0067] 2. Industrial users 28: For industrial users 28, the system can provide electricity, steam, and cold water services. For example, when steam is required during the industrial production process, the high-temperature water in the high-temperature water tank 21 is transported to the steam generator to generate steam for industrial production; when cooling equipment or products is needed, the cold water in the low-parameter cold tank 17 is transported to the cooling equipment for cooling.

[0068] Meanwhile, the system can also perform flexible charge and discharge operations according to the electricity demand and load changes of industrial users. For example, during the peak period of industrial production, the discharge mode is activated to provide power support for industrial users; during the low valley period of industrial production, the charging mode is activated to store energy for future use.

[0069] Example 4 In another preferred embodiment, based on Embodiments 1, 2, and 3, in order to verify the technical effects and practicality of the present invention, an experimental device for a combined cooling, heating, and power integrated energy system driven by wind and light is built. The experimental device mainly includes parts such as a waste heat unit, a cold storage unit, a charging circuit, a heat storage unit, a heating unit, and a discharging circuit, and is connected and debugged according to the actual operation process of Embodiment 1.

[0070] I. Experimental Process and Data Analysis 1. Charging Process Experiment: Start the charging mode during off-peak electricity hours, and record the temperature and pressure changes of the circulating working fluid in the preheater 2, the first waste heat side heater 7, the compressor 8, the water tank side cooler 10, and the water tank side cooler 11; Analyze the energy conversion efficiency and heat transfer efficiency of the circulating working fluid during the charging process, and calculate the overall energy utilization efficiency of the system; Optimize the energy conversion efficiency and energy utilization efficiency of the charging process by adjusting parameters such as the rotational speed and intake pressure of the compressor 8.

[0071] 2. Discharging Process Experiment: Start the discharging mode during peak electricity hours, and record the temperature and pressure changes of the circulating working fluid in the second waste heat side heater 34, the water tank side heater 23, the second turbine 29, and the condenser 31; Analyze the energy conversion efficiency and power generation efficiency of the circulating working fluid during the discharging process, and calculate the overall energy output efficiency of the system; Optimize the energy conversion efficiency and power generation efficiency of the discharging process by adjusting parameters such as the rotational speed and intake pressure of the second turbine 29.

[0072] 3. Experiments under Different Conditions: Conduct experiments in summer and winter respectively, and record the operation parameters and performance indicators of the system under different seasonal conditions; Analyze the influence of seasonal changes on the system operation performance and energy utilization efficiency, and propose corresponding optimization measures and improvement plans; Conduct experiments according to the different demands of residential users 28 and industrial users 28, and record the operation parameters and performance indicators of the system under different user demands; Analyze the influence of the change in user 28 demands on the system operation performance and energy utilization efficiency, and propose corresponding customized service plans and optimization suggestions.

[0073] II. System Performance Verification: Verify the rationality of the system design and the feasibility of the technical effects by comparing and analyzing the experimental data with the theoretical calculation results; improve and optimize the problems and deficiencies found in the experiment to enhance the stability and reliability of the system. Summarize the experimental experience and lessons to provide strong support for the practical application and promotion of the system.

[0074] Through the implementation of the above embodiments and their experimental verification and analysis, we have proved that a wind-solar-driven integrated cooling, heating and power energy system proposed by the present invention has the characteristics of high efficiency, flexibility and reliability, can significantly improve the utilization rate of renewable energy and energy utilization efficiency, reduce the dependence on traditional fossil energy and carbon emissions, and has broad application prospects and promotion value.

[0075] Embodiment 5 In another preferred embodiment, on the basis of Embodiments 1 to 7, this embodiment further elaborates on the operation method of a wind-solar-driven integrated cooling, heating and power energy system of the present invention.

[0076] I. Charging process 1. Working medium preheating During the low electricity consumption period, the charging circuit starts to operate, and the circulating working medium (such as nitrogen or carbon dioxide) flows out of the storage tank and first flows through the preheater 14; In the preheater 14, the circulating working medium exchanges heat with the low-temperature water in the high-parameter cold tank 15; this process is achieved through heat conduction, making the temperature of the circulating working medium gradually increase and preheating it to a temperature range suitable for the operation of the compressor 8; While releasing heat, the temperature of the low-temperature water in the high-parameter cold tank 15 decreases, and then this part of the low-temperature water flows into the low-parameter cold tank 17 for storage, to be used in the subsequent discharging process.

[0077] 2. Working medium compression and temperature rise The preheated circulating working medium enters the compressor 8; The compressor 8 is driven by the motor 9 to compress the circulating working medium; during this process, the pressure and temperature of the circulating working medium both increase significantly, forming a high-temperature and high-pressure working medium.

[0078] 3. Heat transfer and storage The high-temperature and high-pressure working medium first flows through the water tank side cooler 10; In the water tank side cooler 10, the high-temperature and high-pressure working medium exchanges heat with the low-temperature water in the low-temperature water tank 19; this process transfers part of the heat of the circulating working medium to the low-temperature water tank 19, making the temperature of the low-temperature water gradually increase and be stored for subsequent use; Subsequently, the working medium flows through the water tank side cooler 11; In the water tank side cooler 11, the working fluid exchanges heat with the normal temperature water in the return water tank 24, transferring the remaining heat to the hot water tank 26; the heated hot water is stored in the hot water tank 26 for user use (such as domestic hot water). Meanwhile, during the heat transfer process, the working fluid gradually cools down and releases cold energy; this part of the cold energy is absorbed by the low-temperature water in the high-parameter cold tank 15, and then the low-temperature water flows into the low-parameter cold tank 17 for storage.

[0079] 4. Electric energy generation The cooled low-temperature and high-pressure working fluid enters the first turbine 12; In the first turbine 12, the working fluid expands and does work, driving the first generator 13 to rotate and generate electric energy; The generated electric energy can be stored in the battery pack or directly incorporated into the power grid to complete the charging cycle.

[0080] II. Discharge process 1. Working fluid preheating and heating During the peak electricity consumption period, the discharge circuit starts to operate, and the circulating working fluid is driven by the working fluid pump 33 to start the discharge cycle; The circulating working fluid first enters the second waste heat side heater 34 to absorb the waste heat generated by the photovoltaic-thermal integrated panel 5 and the wind turbine 3, completing the preliminary preheating; Subsequently, the working fluid flows into the water tank side heater 23 to further absorb the heat of the high-temperature water in the high-temperature water tank 21; this process significantly increases the temperature of the working fluid, forming a high-temperature and high-pressure working fluid.

[0081] 2. Electric energy generation The high-temperature and high-pressure working fluid enters the second turbine 29; In the second turbine 29, the working fluid expands and does work, driving the second generator 30 to rotate and generate electric energy and output it to the power grid or load.

[0082] 3. Cold energy absorption and heat release The expanded working fluid enters the condenser 31; In the condenser 31, the working fluid exchanges heat with the cold water in the low-parameter cold tank 17, releasing the remaining heat and completing the condensation process. The condensed working fluid becomes liquid, and the temperature decreases significantly; The condensed working fluid is stored in the liquid CO2 storage tank 32 for use in the next cycle; Meanwhile, the cold water in the low-parameter cold tank 17 decreases in temperature after absorbing the cold energy released by the working fluid; subsequently, this part of the cold water is transported back to the high-parameter cold tank 15 for storage for the next cycle. This process realizes the recycling of cold energy and the efficient management of energy.

[0083] Through the above detailed workflow, a combined cooling, heating and power energy system driven by wind and light proposed by the present invention realizes multi-energy complementarity of cooling, heating and power and efficient conversion and utilization of energy.

[0084] In a preferred embodiment, the waste heat unit includes a first circulation pump 1 and a second circulation pump 4, which are respectively connected to a heat exchanger 2 and a photovoltaic-thermal integrated panel 5. The heat-carrying fluid is divided into two paths at the four-way valve. One path enters the heat exchanger 2 through the first circulation pump 1 to absorb the frictional heat from the wind turbine 3, and the other path is transported to the photovoltaic-thermal integrated panel 5 through the second circulation pump 4 to absorb the waste heat. The two paths of fluid converge at the four-way valve to provide heat support for the subsequent process. The four-way valve is used to control the diversion and convergence of the heat-carrying fluid. The above settings not only improve the energy utilization efficiency but also realize the multi-source integration of wind energy, solar energy and waste heat. The first circulation pump 1 strengthens the heat recovery of the wind turbine, and the second circulation pump 4 promotes the photovoltaic-thermal conversion. The precise regulation of the four-way valve ensures the flexibility and stability of the system operation. The overall design optimizes the energy management system.

[0085] In a preferred embodiment, the direct current generated by the photovoltaic-thermal integrated panel 5 is converted into alternating current through an inverter 6 and connected to the municipal power grid, and the wind power generated by the wind turbine 3 is directly connected to the municipal power grid. The above settings achieve the maximum utilization of clean energy. At the same time, the intelligent energy storage device 7 equipped in the system can store electric energy when the power is excessive, ensuring the stability and self-sufficiency of the energy supply.

[0086] In a preferred embodiment, the cold storage unit includes a high-parameter cold storage tank 15 and a low-parameter cold storage tank 17. During the charging process, the low-temperature water in the high-parameter cold storage tank 15 is transported by a high-parameter cold water pump 16 to the preheater 14 to release heat and absorb the cold released by the circulating working fluid in the charging loop, and then flows into the low-parameter cold storage tank 17 for storage. During the discharging process, the cold water in the low-parameter cold storage tank 17 is transported by a low-parameter cold water pump 18 to the condenser 31 to transfer cold, and then transported back to the high-parameter cold storage tank 15 for storage. The above settings realize the efficient cascade storage and release of cold through the cooperation of the high-parameter cold storage tank 15 and the low-parameter cold storage tank 17 and the optimization of the pumping system, improve the system energy efficiency, enhance the system stability and reliability, and at the same time reduce the operating cost, which is in line with the development trend of green energy.

[0087] In a preferred embodiment, the heat storage unit includes a low-temperature water tank 19 and a high-temperature water tank 21. During the charging process, the low-temperature water in the low-temperature water tank 19 is pumped by a low-temperature water pump 20 to the water tank side cooler 10 to absorb heat, and then flows into the high-temperature water tank 21 for storage. During the discharging process, the high-temperature water in the high-temperature water tank 21 is pumped by a high-temperature water pump 22 to the water tank side heater 23 to transfer heat, and then is pumped back to the low-temperature water tank 19 for storage. The above settings achieve the effective storage and release of thermal energy, improving the thermal energy utilization efficiency of the system. At the same time, by controlling the flow rates of the low-temperature water pump 20 and the high-temperature water pump 22, the heat transfer rate can be accurately adjusted to meet different charging and discharging requirements.

[0088] In a preferred embodiment, the heat supply unit includes a return water tank 24 and a hot water tank 26. During the charging process, the normal-temperature water in the return water tank 24 is pumped by a normal-temperature water pump 25 to the water tank side cooler 11 to absorb heat, and then flows into the hot water tank 26 for storage. When the user 28 has a demand for domestic hot water, the hot water in the hot water tank 26 is pumped by a hot water pump 27 to the user 28. The return water with a reduced temperature after use by the user 28 is pumped back to the return water tank 24 for storage. The above settings achieve the recycling of thermal energy, effectively improving the energy utilization efficiency. At the same time, the system is also equipped with an intelligent temperature control device, which can automatically adjust the output power of the hot water pump 27 according to the water temperature set by the user 28 to ensure that the user 28 always obtains domestic hot water at a suitable temperature, enhancing the user 28 experience.

[0089] In a preferred embodiment, the charging circuit includes a first waste heat side heater 7, a compressor 8, a water tank side cooler 10, a water tank side cooler 11, a first turbine 12, and a preheater 14. They are connected in sequence through pipelines to form a closed loop. During the low electricity consumption period, the circulating working fluid flows through the preheater 14 to exchange heat with the low-temperature water in the high-parameter cold tank 15, then enters the first waste heat side heater 7 to absorb waste heat, then enters the compressor 8 to be compressed into a high-temperature and high-pressure working fluid, and then flows through the water tank side cooler 10 and the water tank side cooler 11 in sequence for heat exchange, and finally enters the first turbine 12 to expand and do work to drive the first generator 13 to generate electricity. The compressor 9 is connected to a motor 9. The above settings achieve the energy storage and efficient utilization during the low electricity consumption period. The motor 9 drives the compressor 8 to work, which not only improves the flexibility of the system but also ensures that the circulating working fluid can stably flow through each component to complete the heat exchange and work process, providing stable power support for the power grid.

[0090] In a preferred embodiment, the discharging circuit includes a water tank side heater 23, a second turbine 29, a generator 30, a condenser 31, a liquid The storage tank 32, the working fluid pump 33, and the second waste heat side heater 34 are sequentially connected by pipelines to form a closed loop; during peak electricity consumption periods, the circulating working fluid is driven by the working fluid pump 33 and first enters the second waste heat side heater 34 to absorb waste heat, then flows into the water tank side heater 23 to absorb the heat of the high-temperature water, and then enters the second turbine 29 to expand and do work to drive the second generator 30 to generate electric energy. The expanded working fluid enters the condenser 31 to release the remaining heat and complete condensation. The condensed working fluid is stored in the liquid storage tank 32 for the next round of circulation; the above settings ensure the efficient operation of the system during high-demand periods, not only making full use of waste heat resources, but also improving the energy conversion efficiency of the working fluid through multi-stage heating, providing stable and reliable power support for the power grid, and at the same time achieving the maximum utilization of energy and the friendly protection of the environment.

[0091] In a preferred embodiment, the method further includes a charging stage started during low electricity consumption periods to charge the system, and a discharging stage started during peak electricity consumption periods to supply power to the outside using the system's discharge. The charging and discharging processes are combined with the grid load conditions to achieve flexible storage and release of electric energy to balance the grid load; the above settings effectively relieve the grid pressure and improve the utilization efficiency of power resources; at the same time, by predicting the grid load trend through intelligent algorithms and dynamically adjusting the charging and discharging strategies, the stable operation of the grid is ensured, providing a more reliable power supply for users.

[0092] In a preferred embodiment, the charging process in the charging stage of Step1 adopts an inverse Brayton cycle, and the circulating working fluid is nitrogen or carbon dioxide; the above settings can make full use of low-temperature heat energy for efficient charging, while reducing environmental pollution, and releasing energy through the expansion of the working fluid to achieve stable and continuous power output.

[0093] In a preferred embodiment, in Step2, the preheater 14 preheats the working fluid to a temperature suitable for the operation of the compressor 8, and the heat-carrying fluid is water or thermal oil to improve the heat conduction efficiency; the above settings ensure the stability of the working fluid at the inlet of the compressor 8, reduce energy consumption and extend the equipment life; at the same time, by precisely controlling the temperature of the heat-carrying fluid, the thermal efficiency and operation reliability of the entire system are further optimized.

[0094] In a preferred embodiment, in Step4, the water tank side cooler 11 transfers the heat of the working fluid to the water in the hot water tank 26, and the heated hot water is transported to the user 28 through the hot water pump 27; the above settings not only achieve the effective utilization of heat, but also improve the energy efficiency of the entire system; at the same time, the precise control of the hot water pump 27 ensures that the user 28 obtains a stable and suitable hot water supply, enhancing the practicability and comfort of the system.

[0095] In a preferred embodiment, the discharge process in Step 7 adopts a Rankine cycle or a Brayton cycle, and the circulating working fluid is an organic working fluid or carbon dioxide. The above settings are aimed at improving the energy conversion efficiency and reducing the system complexity. By precisely controlling the cycle parameters such as pressure and temperature, the energy output is further optimized while ensuring the stability and reliability of the system operation.

[0096] A cold, heat and power integrated energy system driven by wind and light and its operation method proposed by the present invention aims at the core problems existing in the current renewable energy utilization process, such as low comprehensive utilization rate, serious waste of wind energy waste heat and insufficient multi-energy complementary utilization, and proposes a solution. Specifically: First of all, the system innovatively combines the efficient utilization of solar energy and wind energy with a Carnot battery system to construct an integrated energy system with multi-energy complementarity of cold, heat and power. By integrating a photovoltaic-thermal integrated panel 5, a wind turbine 3, a Carnot battery system, a heat storage unit, a cold storage unit and a power supply unit, the system breaks the traditional single-energy utilization mode and realizes the efficient conversion and storage of three kinds of energies of cold, heat and power. This integrated design not only improves the comprehensive utilization rate of energy, but also enhances the flexibility and adaptability of the system, enabling it to better meet the changes in different working conditions and energy demands.

[0097] Secondly, the system innovatively utilizes the waste heat generated during the operation of the photovoltaic-thermal integrated panel 5 and the wind turbine 3. Through the heat exchange between the waste heat unit and the circulating working fluid, the wind energy waste heat originally regarded as low-grade heat energy is converted into high-grade heat energy for storage and utilization. This innovative waste heat recovery technology effectively solves the problem of wind energy waste heat waste, significantly improves the comprehensive utilization efficiency of wind energy, and at the same time provides an additional heat energy source for the system, enhancing the overall energy efficiency of the system.

[0098] Furthermore, the system flexibly adjusts the charge and discharge strategy according to the grid load condition and the energy supply situation. During the low electricity consumption period, the system uses the low-valley electricity to drive the compressor 8 for charging, converting the waste heat and the stored heat energy into electric energy. While during the high electricity consumption period, the system converts the stored heat energy into electric energy output through the discharge circuit, effectively balancing the grid load distribution and alleviating the grid pressure. This flexible charge and discharge strategy not only improves the comprehensive utilization rate of energy, but also provides reliable support for the grid peak shaving.

[0099] In addition, the system adopts high-efficiency energy conversion mechanisms such as the reverse Brayton cycle and the Rankine cycle (or the Brayton cycle). By optimizing the working fluid selection and the cycle mode, the system significantly improves the energy conversion efficiency and reduces the system operation cost. At the same time, these high-efficiency energy conversion mechanisms also provide a strong guarantee for the stable operation of the system.

[0100] In summary, the proposed integrated cooling, heating and power energy system driven by wind and light and its operation method have achieved innovations in energy utilization methods, energy conversion mechanisms and system structures; through the integration of various energy utilization technologies and efficient energy conversion mechanisms, the system realizes the multi-energy complementarity and efficient collaborative utilization of cooling, heating and power; such a design not only improves the comprehensive energy utilization rate and the overall energy efficiency of the system, but also provides strong technical support for the efficient development and application of renewable energy; at the same time, the system also has high flexibility and scalability, can adapt to changes in different working conditions and energy demands, and provides a broad prospect for the future sustainable development of energy.

Claims

1. A wind-solar-driven integrated cooling, heating and power energy system, characterized in that: It includes a waste heat unit for collecting the waste heat generated during the operation of the photovoltaic-thermal integrated panel (5) and the wind turbine (3), a cold storage unit for releasing heat and absorbing cold during the charging stage and releasing cold during the discharging stage, a heat storage unit for absorbing, transferring and storing heat during the charging stage and releasing heat during the discharging stage, and a power supply unit for converting thermal energy into electrical energy during the discharging stage. They are connected through a charging circuit and a discharging circuit. During the charging stage, the waste heat of the waste heat unit is heated by driving the compressor (8) with off-peak electricity, part of the heat is stored in the heat storage unit, part of the heat is used for heating by the heating unit, and at the same time, cold is released to the cold storage unit; during the discharging stage, the working fluid absorbs heat to drive the generator to supply power and absorbs cold from the cold storage unit.

2. The integrated cooling, heating and power energy system driven by wind and light according to claim 1, characterized in that: The waste heat unit includes a first circulation pump (1) and a second circulation pump (4), which are respectively connected to the heat exchanger (2) and the photovoltaic-thermal integrated panel (5). The heat-carrying fluid is divided into two paths at the four-way valve. One path enters the heat exchanger (2) through the first circulation pump (1) to absorb frictional heat from the wind turbine (3), and the other path is transported to the photovoltaic-thermal integrated panel (5) through the second circulation pump (4) to absorb waste heat. The two paths of fluid converge at the four-way valve to provide heat support for the subsequent process. The four-way valve is used to control the diversion and convergence of the heat-carrying fluid.

3. The integrated cooling, heating and power energy system driven by wind and light according to claim 2, wherein: The direct current generated by the photovoltaic-thermal integrated panel (5) is converted into alternating current by the inverter (6) and connected to the municipal power grid, and the wind power generated by the wind turbine (3) is directly connected to the municipal power grid.

4. The integrated cooling, heating and power energy system driven by wind and light according to claim 3, characterized in that: The cold storage unit includes a high-parameter cold tank (15) and a low-parameter cold tank (17). During the charging process, the low-temperature water in the high-parameter cold tank (15) is transported by the high-parameter cold water pump (16) to the preheater (14) to release heat and absorb the cold released by the circulating working fluid in the charging circuit, and then flows into the low-parameter cold tank (17) for storage; during the discharging process, the cold water in the low-parameter cold tank (17) is transported by the low-parameter cold water pump (18) to the condenser (31) to transfer cold, and then transported back to the high-parameter cold tank (15) for storage.

5. A combined cooling, heating and power integrated energy system driven by wind and light, characterized in that: The heat storage unit includes a low-temperature water tank (19) and a high-temperature water tank (21). During the charging process, the low-temperature water in the low-temperature water tank (19) is transported by the low-temperature water pump (20) to the water tank side cooler (10) to absorb heat, and then flows into the high-temperature water tank (21) for storage; during the discharging process, the high-temperature water in the high-temperature water tank (21) is transported by the high-temperature water pump (22) to the water tank side heater (23) to transfer heat, and then transported back to the low-temperature water tank (19) for storage.

6. The integrated cooling, heating and power energy system driven by wind and light according to claim 5, wherein: The heating unit includes a return water tank (24) and a hot water tank (26). During the charging process, the normal temperature water in the return water tank (24) is transported by the normal temperature water pump (25) to the water tank side cooler (11) to absorb heat, and then flows into the hot water tank (26) for storage; when the user (28) has a demand for domestic hot water, the hot water in the hot water tank (26) is transported by the hot water pump (27) to the user (28). The return water with a reduced temperature after the user (28) uses it is transported back to the return water tank (24) for storage.

7. A combined cooling, heating and power integrated energy system driven by wind and light, characterized in that: The charging circuit includes a first waste heat side heater (7), a compressor (8), a water tank side cooler (10), a water tank side cooler (11), a first turbine (12) and a preheater (14), which are sequentially connected by pipelines to form a closed loop; during the low electricity consumption period, the circulating working fluid flows through the preheater (14) to exchange heat with the low-temperature water in the high-parameter cold tank (15), and then enters the first waste heat side heater (7) to absorb waste heat, and then enters the compressor (8) to be compressed into a high-temperature and high-pressure working fluid, and then sequentially flows through the water tank side cooler (10) and the water tank side cooler (11) for heat exchange, and finally enters the first turbine (12) to expand and do work to drive the first generator (13) to generate electric energy. The compressor (9) is connected to a motor (9).

8. The integrated cooling, heating and power energy system driven by wind and light according to claim 7, characterized in that: The discharge circuit includes a water tank side heater (23), a second turbine (29), a generator (30), a condenser (31), a liquid storage tank (32), a working fluid pump (33) and a second waste heat side heater (34), which are sequentially connected by pipelines to form a closed loop; during peak electricity consumption periods, the circulating working fluid is driven by the working fluid pump (33), first enters the second waste heat side heater (34) to absorb waste heat, then flows into the water tank side heater (23) to absorb the heat of high-temperature water, and then enters the second turbine (29) to expand and do work to drive the second generator (30) to generate electric energy. The expanded working fluid enters the condenser (31) to release the remaining heat and complete condensation. The condensed working fluid is stored in the liquid storage tank (32) for the next round of circulation.

9. A method for operating a wind-solar-driven integrated cooling, heating and power energy system is a method for operating a wind-solar-driven integrated cooling, heating and power energy system as claimed in claim 8, characterized in that, It includes the following steps: Step1: During the charging stage, use low-valley electricity to drive the compressor (8) to operate; Step2: Transfer the waste heat generated during the operation of the photovoltaic-thermal integrated panel (5) and the wind turbine (3) to the preheater (14) through the heat-carrying fluid to preheat the working fluid; Step3: The preheated working fluid enters the compressor (8) to be compressed and heated up; Step4: The heated working fluid sequentially passes through the water tank side cooler (10) and the water tank side cooler (11), and transfers part of the heat to the water in the low-temperature water tank (19) and the hot water tank (26) respectively. At the same time, release the cold energy to the high-parameter cold tank (15) of the cold energy storage unit; Step6: The water in the low-temperature water tank (19) absorbs heat and is heated up, and is transported to the high-temperature water tank (21) for storage; Step7: During the peak electricity consumption period, start the discharging stage. The working fluid sequentially passes through the second waste heat side heater (34), the water tank side heater (23) and the second turbine (29), absorbs the waste heat and the stored heat, and drives the second generator (30) to supply power; Step8: During the discharging process, the working fluid absorbs cold energy from the low-parameter cold tank (17) of the cold energy storage unit to maintain the temperature balance in the system; Step9: After the working fluid drives the second generator (30) to supply power, the remaining heat is released through the condenser (31) and re-transferred to the cold energy storage unit to realize the recycling of cold energy.

10. The operation method of a combined cooling, heating and power integrated energy system driven by wind and light according to claim 9, characterized in that: The method also includes the steps of starting the charging stage during the low electricity consumption period to charge the system, and starting the discharging stage during the peak electricity consumption period to supply power to the outside by using the system discharge. The charging and discharging processes are combined with the grid load conditions to realize the flexible storage and release of electric energy to balance the grid load.

11. The operation method of a combined cooling, heating and power integrated energy system driven by wind and light according to claim 9, characterized in that: The charging process in the charging stage of Step1 adopts the reverse Brayton cycle, and the circulating working fluid adopts nitrogen or carbon dioxide.

12. The operating method of a combined cooling, heating and power integrated energy system driven by wind and light according to claim 9, characterized in that: In Step2, the preheater (14) preheats the working fluid to a temperature suitable for the operation of the compressor (8), and the heat-carrying fluid adopts water or heat-conducting oil to improve the heat conduction efficiency.

13. The operation method of a combined cooling, heating and power integrated energy system driven by wind and light according to claim 9, characterized in that: In Step4, the water tank side cooler (11) transfers the heat of the working fluid to the water in the hot water tank (26), and the heated hot water is transported to the user (28) through the hot water pump (27).

14. The operating method of a combined cooling, heating and power integrated energy system driven by wind and light according to claim 9, characterized in that: The discharging process in Step7 adopts the Rankine cycle or the Brayton cycle, and the circulating working fluid adopts an organic working fluid or carbon dioxide.

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