Comprehensive energy system integrating solar energy comprehensive utilization and electric heating energy storage

Abstract

The invention discloses a comprehensive energy system integrating solar energy comprehensive utilization and electric heating energy storage, and belongs to the technical field of comprehensive energy systems, the system comprises a solar thermal collector, a photovoltaic power generation system, an electric efficiency controller and a thermal efficiency controller, and the system further comprises a gas turbine which generates electric energy and thermal energy by combusting natural gas, wherein the electric energy is output to the electric efficiency controller, and waste heat is recovered and input to the heat efficiency controller; the phase change heat storage tank is connected with the heat efficiency controller and is used for storing the residual heat and releasing the residual heat at the heat load peak; the electrochemical energy storage system is connected with the electric efficiency controller and is used for storing redundant electric energy and releasing the redundant electric energy as required; the gas-fired boiler is connected with the heat efficiency controller and is only started under the peak regulation working condition; according to the method, the volatility problem caused by new energy power generation can be effectively solved, the multiple utilization value of energy can be improved, and bidirectional dispatching of electric power and heating power is achieved.

Description

Technical Field

[0001] The present invention relates to a comprehensive energy system integrating solar energy comprehensive utilization and electro-thermal energy storage, and belongs to the technical field of comprehensive energy systems. Background Art

[0002] Current technologies usually manage electricity and heat separately, resulting in low energy utilization efficiency. The system cannot flexibly adjust when dealing with load fluctuations and new energy power generation fluctuations, causing energy waste or insufficient supply. Especially when the new energy power generation fluctuates greatly, the traditional system cannot effectively adjust the output of electricity and heat, lacks the effective ability to absorb the volatility of new energy power generation, and further exacerbates energy waste and system instability. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a comprehensive energy system integrating solar energy comprehensive utilization and electro-thermal energy storage, which can not only effectively solve the volatility problem brought by new energy power generation, but also improve the multiple utilization value of energy and realize the two-way scheduling of electricity and heat.

[0004] To achieve the above purpose, the present invention is implemented by the following technical solutions:

[0005] In the first aspect, the present invention provides a comprehensive energy system integrating solar energy comprehensive utilization and electro-thermal energy storage, including a solar collector, a photovoltaic power generation system, an electric efficiency controller, and a thermal efficiency controller. The thermal energy generated by the solar collector is connected to the thermal efficiency controller for unified heat storage and release management, and the electric energy generated by the photovoltaic power generation system is connected to the electric efficiency controller for management. The system further includes:

[0006] A gas turbine that generates electric energy and thermal energy by burning natural gas, wherein the electric energy is output to the electric efficiency controller, and the waste heat is recovered and input to the thermal efficiency controller;

[0007] A phase change heat storage tank, connected to the thermal efficiency controller, for storing the remaining heat and releasing it during peak heat loads;

[0008] An electrochemical energy storage system, connected to the electric efficiency controller, for storing excess electric energy and releasing it as needed;

[0009] A gas boiler, connected to the thermal efficiency controller, and only enabled under peak shaving conditions.

[0010] Further, the system further includes: a ground source heat pump, the electric efficiency controller supplies power to the ground source heat pump, and the output end of the ground source heat pump is respectively connected to the thermal efficiency controller and the cold efficiency controller.

[0011] Further, the thermal efficiency controller is connected to the heat exchanger and the absorption chiller, and is used to supply heat to the user's heat load and provide cooling capacity through the absorption chiller.

[0012] Further, the electrical efficiency controller is bidirectionally connected to the power grid and supplies power to the electric chiller. The cooling capacity of the electric chiller is output to the cooling efficiency controller, and at the same time, the electrical efficiency controller directly supplies power to the user's electrical load.

[0013] Further, the cooling efficiency controller is directly connected to the user's cooling load and distributes the cooling capacity according to the demand.

[0014] Further, the management strategy of the thermal efficiency controller includes:

[0015] When the user's heat load is low, preferentially utilize the heat storage and release of the solar collector and the phase change heat storage tank to achieve the solar heating mode;

[0016] When the user's heat load is medium, operate the solar collector and the ground source heat pump in combination, and supplement with the heat storage and release of the phase change heat storage tank to form a combined solar heat pump heating mode;

[0017] When the user's heat load is high, supplement and enable the waste heat of the gas turbine, and supplement with the heat storage and release of the phase change heat storage tank, and switch to the gas turbine heating mode;

[0018] When the heat load fluctuates violently, enable the gas boiler for peak shaving heating.

[0019] Further, the management strategy of the electrical efficiency controller includes:

[0020] When the photovoltaic power generation meets the user's demand, it is powered by the photovoltaic power generation system and the electrochemical energy storage system;

[0021] When the photovoltaic power generation is insufficient, preferentially call the power generation of the gas turbine to make up the demand;

[0022] When the power generation of the gas turbine is still insufficient, purchase electricity from the power grid to supplement.

[0023] Further, the management strategy of the cooling efficiency controller includes:

[0024] When the user's cooling load is low, directly supply cooling by the ground source heat pump;

[0025] When the user's cooling load is medium, utilize the waste heat of the gas turbine to drive the absorption chiller for cooling;

[0026] When the user's cooling load is high, additionally start the electric chiller for electric cooling.

[0027] Further, the phase change heat storage tank and the electrochemical energy storage system store energy during off-peak electricity hours and release it during peak electricity hours according to the peak-valley electricity price strategy.

[0028] Beneficial effects achieved by the present invention compared with the prior art:

[0029] (1) Traditional energy systems rely on a single energy source, while integrated energy systems can utilize energy more efficiently by integrating multiple energy forms. Heat storage tanks and batteries can store excess electrical and thermal energy, avoiding waste and improving the energy efficiency of the system.

[0030] (2) Solar and wind energy are difficult to provide stable power supply due to their volatility. The integrated electro-thermal energy storage system balances supply and demand through energy storage technology, avoiding grid load imbalance caused by the fluctuations of new energy sources.

[0031] (3) The integrated energy system can adjust the supply of electricity, heat, and gas according to market, climate, and demand changes through flexible scheduling, enhancing the system's ability and efficiency to adapt to the fluctuations of new energy sources.

[0032] (4) The integrated energy system improves the consumption capacity of new energy power generation. By storing excess electricity and heat energy, it reduces the dependence on fossil energy and decreases the waste of renewable energy.

[0033] (5) The combined heat and power energy storage reduces fossil energy consumption and carbon emissions. Especially when using low-grade heat sources for energy storage, it significantly reduces the carbon footprint of the system. Description of the Drawings

[0034] Figure 1 is a schematic diagram of an integrated energy system for comprehensive utilization of solar energy and integrated electro-thermal energy storage;

[0035] In the figure: 1, geothermal energy; 2, natural gas; 3, solar energy; 4, power grid; 5, gas turbine; 6, solar collector; 7, photovoltaic power generation system; 8, phase change heat storage tank; 9, gas boiler; 10, ground source heat pump; 11, heat exchanger; 12, absorption chiller; 13, electric chiller; 14, electrochemical energy storage system; 15, electric efficiency controller; 16, heat efficiency controller; 17, cold efficiency controller; 18, user heat load; 19, user cold load; 20, user electric load. Detailed Embodiments

[0036] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and cannot be used to limit the protection scope of the present invention.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] Embodiment 1. This embodiment introduces a comprehensive energy system integrating solar energy comprehensive utilization and electro-thermal energy storage. The system aims to promote the deep integration of new energy power generation and electro-thermal energy storage through various energy complementary strategies, and build a green circular energy system covering power production, energy storage, heat energy conversion and distribution, and combined cooling, heating and power supply. By optimizing the consumption of new energy and the synergistic effect of thermoelectric energy storage technology, the system can significantly improve energy utilization efficiency, reduce energy waste, and effectively reduce carbon emissions. This comprehensive energy system not only improves the synchronous scheduling ability of electricity and heat energy, but also promotes the sustainable utilization of energy while achieving the goals of green and low carbon, and further promotes the transformation and optimization of the energy structure.

[0039] As Figure 1 shown, the present invention provides a comprehensive energy system integrating solar energy comprehensive utilization and electro-thermal energy storage, including a solar collector 6, a photovoltaic power generation system 7, a phase change heat storage tank 8, and an electrochemical energy storage system 14. The heat energy generated by the solar collector 6 is connected to a heat efficiency controller 16 for unified heat storage and release management, and the electric energy generated by the photovoltaic power generation system 7 is connected to an electric efficiency controller 15 for management. It is characterized by further including:

[0040] A gas turbine 5, which generates heat energy and electric energy by burning natural gas 2. The electric energy generated by the rotation of the first part of the steam turbine is connected to the electric efficiency controller 15, and the waste heat remaining during the operation of the second part is recovered and reused and connected to the heat efficiency controller 16;

[0041] A phase change heat storage tank 8, which is interconnected with the heat efficiency controller 16, is used to store the remaining heat and release heat when the heat load is large;

[0042] An electrochemical energy storage system 14, which is interconnected with the electric efficiency controller 15, is used to store excess electric energy and release it when needed;

[0043] A gas boiler 9, which is connected to the heat efficiency controller 16 and is only used for peak shaving.

[0044] Specifically, the system further includes: a ground source heat pump 10, an electrical efficiency controller 15 supplies power to the ground source heat pump 10, and the output end of the ground source heat pump 10 is respectively connected to a heat efficiency controller 16 and a cold efficiency controller 17.

[0045] Specifically, the heat efficiency controller 16 is connected to a heat exchanger 11 to provide heat for users, and the heat efficiency controller 16 is also connected to an absorption chiller 12.

[0046] Specifically, the electrical efficiency controller 15 is interconnected with the power grid 4, and the electrical efficiency controller 15 is also connected to an electric chiller 13 to supply electrical energy to it for refrigeration and send the refrigeration to the cold efficiency controller 17. The electrical efficiency controller 15 is connected to the user electrical load 20 to meet the electrical demands of users.

[0047] Specifically, the cold efficiency controller 17 is connected to the user cold load 19 to provide sufficient cooling capacity for users.

[0048] By integrating solar energy and electro-thermal energy storage technologies, the system constructs a green circular energy system covering power generation, energy storage, heat energy conversion and distribution, realizes the closed-loop of electricity - heat - cold - energy storage, and promotes combined cooling, heat and power generation. Optimizing energy dispatching and storage not only reduces carbon emissions, but also improves energy utilization efficiency, promotes the transformation of the energy structure, and provides a new solution for sustainable development.

[0049] Through efficient energy storage technologies, the system ensures the reliability of power supply. When solar energy is affected by weather or seasons, the heat storage tank and battery provide additional support to ensure stable power supply during peak power demands and avoid volatility impacts. At the same time, the electro-thermal energy storage system improves energy conversion efficiency, reduces energy losses, decreases the dependence on fossil fuels, and provides a green and clean energy solution.

[0050] Specifically, the management strategies of the heat efficiency controller 16 include:

[0051] The heat source of the heat efficiency controller 16 comes from the gas turbine 5, gas boiler 9, solar collector 6, ground source heat pump 10, and the phase change heat storage tank 8 outputs to the heat exchanger 11 and the absorption chiller 12;

[0052] When the user's heat load is small, the heat in the solar collector 6 is utilized alone, and the phase change heat storage tank 8 is assisted for heat storage and release to reduce costs. At this time, it is the solar heating mode;

[0053] When the user's heat load increases, the heat in the solar collector 6 and the ground source heat pump 10 is utilized, and the phase change heat storage tank 8 is assisted for heat storage and release to reduce costs. At this time, it is the combined solar and heat pump heating mode;

[0054] When the user's heat load is large, maintain the operation of the solar heat pump combined heating mode. Turn on the gas turbine 5 according to the insufficient heat, and assist with the phase change heat storage tank 8 for heat storage and release to reduce costs. At this time, it is the gas turbine heating mode;

[0055] When the user's heat load fluctuates greatly, turn on the gas boiler 9 while maintaining the operation of the gas turbine heating mode for peak shaving. At this time, it is the peak shaving heating mode.

[0056] Specifically, the management strategy of the electric efficiency controller includes:

[0057] When the power generation of the photovoltaic power generation system meets the user's electrical load, use the photovoltaic power generation system and the electrochemical energy storage system for power supply. At this time, it is the photovoltaic power supply mode;

[0058] When the power generation of the photovoltaic power generation system does not meet the user's demand, maintain the operation of the photovoltaic power supply mode and supplement it with the power generation of the gas turbine started due to the heat load. If the power demand can be met, it is the gas turbine power supply mode at this time;

[0059] When the gas turbine power supply mode still cannot meet the user's demand, power can be purchased from the power grid to meet the requirements.

[0060] Specifically, the management strategy of the cold efficiency controller includes:

[0061] When the user's cooling load is small, the ground source heat pump can be used for cooling. At this time, it is the direct cooling mode;

[0062] When the user's cooling load increases, if the gas turbine is started to meet the user's heat load, it can provide waste heat for the absorption chiller. At this time, it is the chiller cooling mode;

[0063] When the user's cooling load is large, turn on the electric chiller in the chiller cooling mode. At this time, it is the electric cooling mode.

[0064] Specifically, for the phase change heat storage tank and the electrochemical energy storage system, according to the peak-valley electricity price policy, the phase change heat storage tank and the electrochemical energy storage system should be fully charged during the night valley electricity period and used during the day peak price and high load periods.

[0065] The present invention demonstrates significant technical advantages and innovative effects, which can be specifically summarized as the following points:

[0066] (1) Multi-energy complementarity, green cycle: The present invention integrates solar energy and electro-thermal energy storage technologies, constructs a green cycle energy system, realizes the efficient closed-loop of electricity, energy storage, heat energy and cooling energy, and promotes the combined production of cooling, heat and power.

[0067] (2) Technological innovation, low-carbon leadership: By introducing electro-thermal energy storage technology, optimizing the traditional energy system, significantly improving energy conversion efficiency, promoting low-carbon operation and facilitating the development of new energy technologies.

[0068] (3) Efficient energy storage, flexible scheduling: The core lies in the efficient storage and flexible scheduling of electro-thermal energy storage technology. The intelligent management system conducts scheduling based on power generation fluctuations and energy storage demands to solve the problem of new energy fluctuations.

[0069] (4) Energy conservation, emission reduction, green and environmental protection: By reducing reliance on fossil fuels, promoting the application of clean energy, optimizing energy storage technology to reduce carbon emissions, and supporting green and low-carbon goals.

[0070] Compared with the existing technologies, the integrated energy system of new energy power generation and electro-thermal hybrid energy storage proposed by the present invention demonstrates remarkable technological advantages and innovative effects. By integrating different types of energy forms, this system can not only utilize each portion of energy more efficiently but also convert surplus electricity into heat for storage to avoid energy waste. The introduction of the thermoelectric hybrid energy storage technology can effectively balance the volatility of new energy power generation, absorb the excess new energy power, and flexibly release the stored energy during peak demand periods, thereby improving the energy utilization rate of the system.

[0071] In addition, through a flexible energy scheduling mechanism, this system can dynamically adjust the supply of electricity, heat, gas and other energies according to changes in the electricity market, climate conditions and energy demands. This highly flexible design can not only optimize the matching of different energy resources but also enhance the system's ability to cope with new energy fluctuations and load changes, reduce the reliance on traditional fossil energies, and effectively reduce the waste of renewable energies.

[0072] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can still be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An integrated energy system integrating solar energy comprehensive utilization and electric thermal energy storage, characterized in that: The system comprises a solar thermal collector (6), a photovoltaic power generation system (7), an electrical efficiency controller (15) and a thermal efficiency controller (16), wherein the thermal energy generated by the solar thermal collector (6) is connected to the thermal efficiency controller (16) for unified heat storage and release management, and the electrical energy generated by the photovoltaic power generation system (7) is connected to the electrical efficiency controller (15) for management, and is characterized in that the system further comprises: A gas turbine (5) generates electrical energy and thermal energy by burning natural gas (2), wherein the electrical energy is output to an electrical efficiency controller (15), and waste heat is recovered and input to a thermal efficiency controller (16); A phase-change heat storage tank (8) connected to a thermal efficiency controller (16) for storing excess heat and releasing it when the heat load reaches a peak; An electrochemical energy storage system (14), connected to an electrical efficiency controller (15), for storing excess electrical energy and releasing it on demand; The gas boiler (9) is connected to the thermal efficiency controller (16) and is enabled only under peak load conditions.

2. The integrated energy system integrating comprehensive utilization of solar energy and electric thermal energy storage according to claim 1 is characterized in that: The system further comprises: a ground source heat pump (10); the electric efficiency controller (15) supplies power to the ground source heat pump (10); and the output end of the ground source heat pump (10) is respectively connected to a heat efficiency controller (16) and a cold efficiency controller (17).

3. The integrated energy system integrating comprehensive utilization of solar energy and electric thermal energy storage according to claim 2 is characterized in that: The thermal efficiency controller (16) is connected to the heat exchanger (11) and the absorption refrigerator (12) and is used to supply heat to the user heat load (18) and provide cooling through the absorption refrigerator (12).

4. The integrated energy system integrating comprehensive utilization of solar energy and electric thermal energy storage according to claim 2 is characterized in that: The electric efficiency controller (15) is bidirectionally connected to the power grid (4) and supplies power to the electric refrigerator (13). The cooling capacity of the electric refrigerator (13) is output to the cooling efficiency controller (17). At the same time, the electric efficiency controller (15) directly supplies power to the user's electric load (20).

5. The integrated energy system integrating comprehensive utilization of solar energy and electric thermal energy storage according to claim 2 is characterized in that: The cooling efficiency controller (17) is directly connected to the user's cooling load (19) and distributes cooling capacity according to demand.

6. The integrated energy system integrating comprehensive utilization of solar energy and electric thermal energy storage according to claim 3 is characterized in that: The management strategy of the thermal efficiency controller (16) includes: When the user's heat load is low, the heat storage and release of the solar collector (6) and the phase change heat storage tank (8) are preferentially utilized to realize the solar heating mode; When the user's heat load is medium, the solar thermal collector (6) and the ground source heat pump (10) are operated in combination, and the heat storage and release of the phase change heat storage tank (8) are assisted to form a solar heat pump combined heating mode; When the user's heat load is high, the waste heat of the gas turbine (5) is supplemented and activated, and the heat stored and released by the phase change heat storage tank (8) is used to switch to the gas turbine heating mode; When the heat load fluctuates violently, the gas boiler (9) is activated to provide peak-load heating.

7. The comprehensive energy system integrating comprehensive utilization of solar energy and electric thermal energy storage according to claim 4 is characterized in that: The management strategy of the electrical efficiency controller (15) includes: When the photovoltaic power generation meets the user's demand, the photovoltaic power generation system (7) and the electrochemical energy storage system (14) supply power; When the photovoltaic power generation is insufficient, the power generation of the gas turbine (5) is used to meet the demand; When the power generation of the gas turbine (5) is still insufficient, electricity is purchased from the power grid (4) to supplement it.

8. The integrated energy system integrating comprehensive utilization of solar energy and electric thermal energy storage according to claim 5 is characterized in that: The management strategy of the cooling efficiency controller (17) includes: When the user's cooling load is low, the ground source heat pump (10) directly provides cooling; When the user's cooling load is medium, the waste heat of the gas turbine (5) is used to drive the absorption refrigerator (12) to provide cooling; When the user's cooling load is high, an additional electric refrigeration machine (13) is activated to provide electric cooling.

9. The comprehensive energy system integrating comprehensive utilization of solar energy and electric thermal energy storage according to claim 1 is characterized in that: The phase change heat storage tank (8) and the electrochemical energy storage system (14) store energy during valley power periods and release it during peak power periods according to the peak-valley electricity price strategy.

Images