Heat pump heat storage system and control method thereof

Abstract

The invention discloses a heat pump heat storage system and a control method thereof, and the heat pump heat storage system comprises a heat pump system which comprises a compressor, a condenser, a throttling device and an evaporator which are connected in sequence; one end of the heat storage device is connected with the condenser, the other end of the heat storage device is connected with a user side, and the heat storage device is used for storing heat released by the condenser and supplying heat to the user side; and the wind power device is connected with the compressor and used for driving the compressor, storing redundant heat energy generated by the heat pump system in the heat storage device in the state of sufficient wind power, and adopting the heat storage device to supply heat to the user side in the state of insufficient wind power. The problems that in the prior art, wind power resources are unstable and difficult to apply are solved, effective matching of supply and demand of wind energy and heat energy is achieved, and the energy utilization efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of wind power technology, and in particular to a heat pump heat storage system and a control method thereof. Background Art

[0002] As the world is eager to pursue the goal of carbon neutrality, the scale of renewable electricity continues to expand. However, the volatility and intermittency of renewable resources such as wind energy, as well as the resulting peak-valley price difference of electricity, are becoming increasingly apparent. Traditional water heat sources are often affected by seasonality, region, and water source temperature fluctuations, which makes it difficult for high-temperature heat pump systems to maintain high-efficiency operation all year round and around the clock. Especially in industrial applications with high heat load requirements, regional and seasonal changes can easily cause unstable heat source temperatures, affecting the heat extraction efficiency and output stability of the heat pump.

[0003] In this context, the combination of heat pump and thermal storage technology has become an innovative solution to improve energy efficiency, stabilize grid operation and reduce heating costs. During off-peak electricity price periods, heat pumps driven by excess renewable energy are used to heat the environment, and heat energy is stored in thermal storage devices, such as molten salt thermal storage tanks or phase change materials, for release during peak hours or when demand increases, thereby shaving peaks and filling valleys, alleviating the contradiction between electricity supply and demand. Building envelopes and indoor furniture can also be used as passive thermal storage elements to naturally store and release heat and improve living comfort. The integration of heat pump and thermal storage technology not only optimizes the supply of electricity and heat energy, but also puts higher requirements on key technologies such as heat pump system efficiency, intelligent control algorithms, and cost-benefit analysis. Through continuous technological innovation and system integration optimization, this technical path has demonstrated great potential in achieving efficient energy utilization, reducing carbon emissions and promoting sustainable development, and has become a key component in building a smarter, greener and more economical future energy system.

[0004] As a renewable energy source, wind power generation provides additional power supply for high-temperature heat pumps. However, wind power generation relies on changes in wind speed, resulting in unstable power output, and traditional heat pump systems cannot adapt to the volatility of this power supply. In addition, thermal energy demand is cyclical and volatile, and between peak and trough periods of wind power generation, thermal energy supply may be excessive or insufficient, resulting in energy waste or supply interruption. At the same time, traditional thermal storage technology has efficiency problems in storing high-grade thermal energy and quickly converting thermal energy to respond to demand, and it is difficult to meet the stability and efficiency requirements of industrial or residential high-grade thermal energy applications.

[0005] There is currently no effective solution to the problem of unstable wind resources and difficulty in application in related technologies. Summary of the invention

[0006] The present invention provides a heat pump heat storage system and a control method thereof, so as to at least solve the problem that wind power resources are unstable and difficult to apply in the prior art.

[0007] To solve the above technical problems, according to one aspect of an embodiment of the present invention, a heat pump heat storage system is provided, comprising: a heat pump system, comprising a compressor, a condenser, a throttling device and an evaporator connected in sequence; a heat storage device, one end of which is connected to the condenser, and the other end is connected to the user end, for storing heat using the heat released by the condenser and providing heat to the user end; a wind power device, connected to the compressor, for driving the compressor, storing excess heat energy generated by the heat pump system in the heat storage device when wind is sufficient, and using the heat storage device to provide heat to the user end when wind is insufficient.

[0008] Furthermore, the heat storage device is a molten salt heat storage device; the condenser is also connected to the user end, and is used to use the heat released by the condenser to provide heat to the user end.

[0009] Furthermore, it also includes: an energy-saving tank, one end of which is connected to the heat storage device and the condenser, and the other end is connected to the user end. The energy-saving tank contains a preheating fluid, which is used to use the heat energy of the heat storage device and the condenser to heat the preheating fluid to a preset temperature for user use.

[0010] Furthermore, the compressor is a two-stage compression system, including a first-stage compressor and a second-stage compressor; the wind power device includes: a wind turbine; a mechanical energy transmission device, one end of which is connected to the wind turbine and the other end is connected to the first-stage compressor, for providing mechanical energy to the first-stage compressor and driving the first-stage compressor to operate; a wind power generation device, one end of which is connected to the wind turbine and the other end is connected to the first-stage compressor and the second-stage compressor, for providing electrical energy to the first-stage compressor and the second-stage compressor and driving the first-stage compressor and the second-stage compressor to operate.

[0011] Furthermore, the wind power generation device includes: a power electronic converter connected to the wind turbine and used to convert the three-phase AC power output by the wind into DC power; a frequency converter, one end of which is connected to the power electronic converter and the other end is connected to the first-stage compressor, and is used to convert DC power into AC power required by the first-stage compressor.

[0012] Furthermore, the mechanical energy transmission device includes: a main transmission shaft and a gear box, one end of the main transmission shaft is connected to the wind turbine, and the other end is connected to the gear box, and the gear box is connected to the impeller shaft of the first-stage compressor, and is used to convert the rotation of the wind turbine into the rotation speed required by the first-stage compressor to drive the first-stage compressor to operate.

[0013] Furthermore, the mechanical energy transmission device also includes: a flywheel energy storage device, located between the main drive shaft and the gear box, for storing mechanical energy when the wind is sufficient and releasing it when the wind is insufficient, so as to provide power for the first-stage compressor; a coupling, the coupling including a plurality of couplings, respectively located between the wind turbine and the main drive shaft, between the main drive shaft and the flywheel energy storage device, between the flywheel energy storage device and the gear box, and between the gear box and the impeller shaft of the first-stage compressor, for smoothly transmitting power.

[0014] According to another aspect of an embodiment of the present invention, a heat pump thermal storage system control method is provided, which is applied to a heat pump thermal storage system as described above, the method comprising: detecting current wind force parameters, and determining whether there is wind according to the current wind force parameters; when there is no wind, controlling the operation of the heat pump thermal storage system according to the heat storage amount of the thermal storage device; when there is wind, controlling the operation of the heat pump thermal storage system according to the current wind force parameters.

[0015] Furthermore, the operation of the heat pump heat storage system is controlled according to the heat storage amount of the heat storage device, including: determining whether the heat storage amount of the heat storage device is greater than a first preset value; if so, controlling the heat storage device to release heat to provide heating for the user end; otherwise, starting the backup power supply mode to power the first-stage compressor.

[0016] Furthermore, the starting backup power supply mode supplies power to the first-stage compressor, including: detecting whether a backup power supply exists; if the backup power supply exists, detecting whether the backup power supply is sufficient, and when the backup power supply is sufficient, using the backup power supply to power the first-stage compressor; if the backup power supply does not exist or the backup power supply is insufficient, controlling the flywheel energy storage device to release mechanical energy to provide power for the first-stage compressor, and when the mechanical energy of the flywheel energy storage device is insufficient to drive the first-stage compressor, controlling the heat pump thermal storage system to shut down unnecessary loads.

[0017] Furthermore, the current wind parameters include at least wind speed and wind direction; the operation of the heat pump thermal storage system is controlled according to the current wind parameters, including: when the wind speed reaches a preset wind speed and the wind direction is stable, controlling the wind turbine to provide mechanical energy to the first-stage compressor through a mechanical energy transmission device to drive the first-stage compressor to operate; when the wind speed does not reach the preset wind speed or the wind direction is unstable, controlling the heat storage device to release heat to provide heating for the user end.

[0018] Further, after driving the first-stage compressor to operate, it also includes: detecting whether the output power of the wind turbine is greater than the rated power of the first-stage compressor, if so, storing the excess mechanical energy in the flywheel energy storage device, otherwise, maintaining the wind turbine to provide mechanical energy to the first-stage compressor through the mechanical energy transmission device; detecting whether the heat provided by the heat pump system meets user needs, if so, storing the excess heat in the heat storage device, otherwise, maintaining the heat pump system to provide heating to the user end; detecting whether the heat storage capacity of the heat storage device is less than a second preset value, if so, controlling the wind turbine to power the second-stage compressor through the wind power generation device, otherwise, maintaining the wind turbine to provide mechanical energy to the first-stage compressor through the mechanical energy transmission device.

[0019] Furthermore, after controlling the operation of the heat pump thermal storage system according to the current wind parameters, it also includes: detecting whether the heat storage amount of the thermal storage device is less than a third preset value; if so, controlling the wind turbine to power the first-stage compressor through the wind power generation device, and when the heat provided by the heat pump system meets user needs, storing excess heat in the thermal storage device, and when the heat provided by the heat pump system cannot meet user needs, providing mechanical energy to the first-stage compressor through the flywheel energy storage device; otherwise, maintaining the current operating state.

[0020] Furthermore, after providing mechanical energy to the first-stage compressor through the flywheel energy storage device, it also includes: detecting whether the heat storage capacity of the heat storage device is less than a fourth preset value; if so, controlling the wind turbine to power the second-stage compressor through the wind power generation device, and when the heat provided by the heat pump system meets user needs, storing excess heat in the heat storage device; otherwise, maintaining the current operating state.

[0021] According to another aspect of an embodiment of the present invention, a storage medium containing computer executable instructions is provided. When the computer executable instructions are executed by a computer processor, the computer executable instructions are used to execute the heat pump thermal storage system control method as described above.

[0022] In the present invention, a heat pump heat storage system integrating wind power is provided, including a heat pump system, a heat storage device connected to the heat pump system, and used to use the heat released by the condenser to store heat and provide heating to the user end. In addition, it also includes a wind device connected to the compressor of the heat pump system, which is used to drive the compressor, store the excess heat energy generated by the heat pump system in the heat storage device when the wind is sufficient, and use the heat storage device to provide heating to the user end when the wind is insufficient. The above scheme integrates wind energy conversion, high-efficiency heat pumps, and high-density heat storage technologies into one, and realizes the effective matching of wind energy and heat energy supply and demand by optimizing the energy conversion and storage process, especially in an environment with abundant wind resources. This provides a clean and renewable energy option for the high-temperature heat pump system, and avoids the impact of fluctuations in water heat sources on the system energy stability. With the help of efficient heat storage devices, electrical energy can be converted into thermal energy and stored when wind power generation is sufficient, and the stored thermal energy can be released when wind power generation is low or there is insufficient electricity at night, maintaining the stable operation of the high-temperature heat pump system, improving energy utilization efficiency, reducing system energy consumption, and reducing system operating costs, achieving significant environmental and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is an optional structural schematic diagram of a heat pump thermal storage system according to an embodiment of the present invention;

[0024] Figure 2 is an optional flow chart of a heat pump thermal storage system control method according to an embodiment of the present invention;

[0025] Figure 3 is another optional flow chart of a heat pump thermal storage system control method according to an embodiment of the present invention.

[0026] Description of reference numerals:

[0027] 1. Evaporator; 2. First-stage compressor; 3. Second-stage compressor; 4. Condenser; 5. Flasher; 6. First-stage throttling device; 7. Second-stage throttling device; 8. Wind turbine; 9. Power electronic converter; 10. Frequency converter; 11. Electric valve 1; 12. Electric valve 2; 13. Molten salt heat storage device; 14. Energy-saving tank; 15. Wind speed and direction sensor; 16. Temperature sensor; 17. Coupling 1; 18. Main drive shaft; 19. Coupling 2; 20. Flywheel energy storage device; 21. Coupling 3; 22. Gearbox; 23. Coupling 4. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two.

[0030] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0031] It should be understood that although the terms first, second, third, etc. may be used to describe controllers in embodiments of the present invention, these controllers should not be limited to these terms. These terms are only used to distinguish controllers connected to different devices. For example, without departing from the scope of embodiments of the present invention, a first controller may also be referred to as a second controller, and similarly, a second controller may also be referred to as a first controller.

[0032] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0033] It should also be noted that the term "includes", "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, so that a commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the commodity or device including the elements.

[0034] The optional embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0035] Example 1

[0036] In a preferred embodiment 1 of the present invention, a heat pump thermal storage system is provided. Specifically, Figure 1 An optional structural schematic diagram of the heat pump thermal storage system is shown in FIG. Figure 1 As shown, the heat pump thermal storage system includes:

[0037] The heat pump system comprises a compressor, a condenser 4, a throttling device and an evaporator 1 connected in sequence;

[0038] A heat storage device, one end of which is connected to the condenser 4 and the other end of which is connected to the user end, is used to store heat using the heat released by the condenser 4 and to provide heat to the user end;

[0039] The wind device is connected to the compressor and is used to drive the compressor. When the wind is sufficient, the excess heat energy generated by the heat pump system is stored in the heat storage device, and when the wind is insufficient, the heat storage device is used to provide heating to the user end.

[0040] In the above embodiment, a heat pump heat storage system integrating wind power is provided, including a heat pump system, a heat storage device connected to the heat pump system, and used to use the heat released by the condenser to store heat and provide heating to the user end. In addition, it also includes a wind device connected to the compressor of the heat pump system, which is used to drive the compressor, store the excess heat energy generated by the heat pump system in the heat storage device when the wind is sufficient, and use the heat storage device to provide heating to the user end when the wind is insufficient. The above scheme integrates wind energy conversion, high-efficiency heat pumps, and high-density heat storage technologies. By optimizing the energy conversion and storage process, it realizes the effective matching of wind energy and heat energy supply and demand, especially in an environment with abundant wind resources. This provides a clean and renewable energy option for high-temperature heat pump systems and avoids the impact of fluctuations in water heat sources on the system energy stability. With the help of efficient heat storage devices, electrical energy can be converted into thermal energy and stored when wind power generation is sufficient, and the stored thermal energy can be released when wind power generation is low or there is insufficient electricity at night, maintaining the stable operation of the high-temperature heat pump system, improving energy utilization efficiency, reducing system energy consumption, and reducing system operating costs, achieving significant environmental and economic benefits.

[0041] In a preferred embodiment of the present invention, the heat storage device is a molten salt heat storage device 13; existing technologies mainly rely on water heat storage or phase change material heat storage, which have certain limitations in terms of thermal energy storage density, temperature range, service life and dynamic response capability. The high heat storage density and wide temperature range of the molten salt heat storage device 13 of the present invention make the storage and release of thermal energy more efficient, reduce energy loss, and improve the thermal energy utilization efficiency of the system. The chemical stability and thermal stability of the molten salt ensure the long service life and high reliability of the heat storage device, achieve a dynamic balance between thermal energy supply and demand, and improve the overall efficiency of the system.

[0042] The condenser 4 is also connected to the user end, and is used to provide heat to the user end using the heat released by the condenser 4. In the present invention, the user's heat energy demand can be supplied in a variety of ways, such as the condenser 4 is directly connected to the user end to provide heat to the user. Alternatively, the user end is heated by a heat storage device.

[0043] In order to improve the efficiency of energy utilization, it also includes: an energy-saving tank 14, one end of which is connected to the heat storage device and the condenser 4, and the other end is connected to the user end. The energy-saving tank 14 contains a preheating fluid, which is used to use the heat energy of the heat storage device and the condenser 4 to heat the preheating fluid to a preset temperature for use by the user. Before the heat energy is released to the user device, the heat energy first passes through the energy-saving tank 14, and the fluid inside the energy-saving tank 14 is preheated to a temperature close to the heat energy user's demand, realizing the preliminary distribution of heat energy, reducing the burden on the final heating equipment, and improving energy utilization efficiency.

[0044] In another preferred embodiment of the present invention, the compressor is a two-stage compression system, including a first-stage compressor 2 and a second-stage compressor 3; the wind power device includes: a wind turbine 8; a mechanical energy transmission device, one end of which is connected to the wind turbine 8 and the other end is connected to the first-stage compressor 2, for providing mechanical energy to the first-stage compressor 2 and driving the first-stage compressor 2 to operate; a wind power generation device, one end of which is connected to the wind turbine 8 and the other end of which is connected to the first-stage compressor 2 and the second-stage compressor 3, for providing electrical energy to the first-stage compressor 2 and the second-stage compressor 3 and driving the first-stage compressor 2 and the second-stage compressor 3 to operate. In this system, when the wind turbine 8 captures wind energy and converts it into mechanical energy, it is designed as a dual output, a part of the mechanical energy is directly transmitted to the first-stage compressor 2 through the mechanical transmission system, and the other part converts the mechanical energy into alternating current through the generator therein. The electricity provided by wind power generation can be used to enhance the operating stability and efficiency of the high-temperature heat pump system, or to provide energy for auxiliary heat energy conversion equipment to ensure that the system can still maintain efficient operation when the temperature of the water heat source fluctuates.

[0045] Preferably, the wind power generation device includes: a power electronic converter 9 connected to the wind turbine 8, used to convert the three-phase AC power output by the wind into DC power; a frequency converter 10, one end of which is connected to the power electronic converter 9, and the other end is connected to the first-stage compressor 2, used to convert the DC power into the AC power required by the first-stage compressor 2. Due to the volatility of wind power, the generated AC power is unstable and discontinuous. At this time, the power electronic converter 9 first uses a rectifier bridge (three-phase full-bridge or half-bridge circuit) to convert the three-phase AC power generated by the wind turbine 8 into pulsating DC power. Subsequently, the pulsating DC power is filtered through an electrolytic capacitor to convert the pulsating DC power into smooth DC power. The frequency converter 10 adopts an inverter technology to convert DC power into AC power with adjustable frequency and voltage through power electronic components, and realizes free adjustment of the output AC power frequency and voltage by accurately controlling the switch of the inverter circuit. Through the regulation of the inverter 10, the power quality can be optimized to ensure compatibility with the power grid. At the same time, the output power can be adjusted according to changes in wind speed to achieve efficient conversion and stable supply of power, meeting the needs of grid access and heat pump systems for stable power.

[0046] The mechanical energy transmission device includes: a main transmission shaft 18 and a gear box 22. One end of the main transmission shaft 18 is connected to the wind turbine 8, and the other end is connected to the gear box 22. The gear box 22 is connected to the impeller shaft of the first-stage compressor 2, and is used to convert the rotation of the wind turbine 8 into the required rotation speed of the first-stage compressor 2 to drive the first-stage compressor 2 to operate. In addition, the mechanical energy transmission device also includes: a flywheel energy storage device 20, which is located between the main transmission shaft 18 and the gear box 22, and is used to store mechanical energy when the wind is sufficient, and release it when the wind is insufficient, so as to provide power for the first-stage compressor 2; a coupling, which includes a plurality of couplings, which are respectively located between the wind turbine 8 and the main transmission shaft 18, between the main transmission shaft 18 and the flywheel energy storage device 20, between the flywheel energy storage device 20 and the gear box 22, and between the gear box 22 and the impeller shaft of the first-stage compressor 2, and are used to smoothly transmit power.

[0047] A portion of the output shaft of the wind turbine 8 is connected to a main drive shaft 18 through a coupling 1 to concentrate the output of mechanical energy. The flywheel energy storage device 20 is connected to the main drive shaft 18 through a coupling 2. The flywheel energy storage device 20 ensures that mechanical energy can continue to be provided when the wind is insufficient. Select a suitable gearbox 22 and adjust the speed ratio to convert the high speed of the turbine into the speed required by the compressor. Use a coupling 3 to connect the flywheel energy storage device 20 to the gearbox 22 to ensure effective transmission of energy. The output shaft of the gearbox 22 is connected to the impeller shaft of the first-stage compressor 2 through a coupling 4 to ensure smooth transmission of power.

[0048] Wind power generation relies on changes in wind speed, resulting in unstable power output, and traditional heat pump systems cannot adapt to this volatility of power supply. In addition, thermal energy demand is cyclical and volatile, and between peak and trough periods of wind power generation, thermal energy supply may be excessive or insufficient, resulting in energy waste or supply interruption. At the same time, traditional thermal storage technology has efficiency issues in storing high-grade thermal energy and quickly converting thermal energy to respond to demand, making it difficult to meet the stability and efficiency requirements of industrial or residential high-grade thermal energy applications.

[0049] In response to the above problems, the present invention proposes a heat pump thermal storage system driven by wind energy, and combines mechanical energy storage to ensure the stability and efficiency of the system. In an environment with abundant wind resources, this provides a clean and renewable energy option for the power demand of the high-temperature heat pump system, avoiding the impact of water heat source fluctuations on the system energy stability. The electricity provided by wind power generation can be used to enhance the operating stability and efficiency of the high-temperature heat pump system, or to provide energy for auxiliary heat energy conversion equipment to ensure that the system can still maintain efficient operation when the water heat source temperature fluctuates. At the same time, the excess mechanical energy is stored in the flywheel energy storage device 20, and the mechanical energy is released when the wind is insufficient to ensure the continuous operation of the system.

[0050] With the help of efficient heat storage devices, mechanical energy and electrical energy can be converted into thermal energy and stored when there is sufficient wind, and the stored thermal energy and mechanical energy can be released when there is insufficient wind, maintaining the stable operation of the high-temperature heat pump system, reducing dependence on immediate heat source demand, and improving the overall efficiency and economy of energy utilization.

[0051] Example 2

[0052] In the preferred embodiment 2 of the present invention, a heat pump thermal storage system control method is provided, which is applied to the heat pump thermal storage system in the above embodiment 1. The unit collects information such as the operating status of the wind turbine, the heat pump system parameters, the status of the molten salt thermal storage device and the environmental conditions through sensors, and uses algorithm analysis and prediction to generate operating instructions for the power converter, the heat pump and the molten salt thermal storage device, control the electric valve 1 and the electric valve 2, effectively coordinate the operation of each component in the system, maximize energy efficiency and economic benefits, and achieve effective coordination of wind drive and thermal energy storage.

[0053] Specifically, Figure 2 An optional flow chart of the method is shown as follows: Figure 2 As shown, the method includes the following steps S202-S206:

[0054] S202: Detect current wind force parameters, and determine whether there is wind according to the current wind force parameters;

[0055] S204: When there is no wind, controlling the operation of the heat pump heat storage system according to the heat storage amount of the heat storage device;

[0056] S206: When there is wind, the operation of the heat pump thermal storage system is controlled according to the current wind force parameters.

[0057] In the above embodiment, a heat pump heat storage system integrating wind power is provided, including a heat pump system, a heat storage device connected to the heat pump system, and used to use the heat released by the condenser to store heat and provide heating to the user end. In addition, it also includes a wind device connected to the compressor of the heat pump system, which is used to drive the compressor, store the excess heat energy generated by the heat pump system in the heat storage device when the wind is sufficient, and use the heat storage device to provide heating to the user end when the wind is insufficient. The above scheme integrates wind energy conversion, high-efficiency heat pumps, and high-density heat storage technologies. By optimizing the energy conversion and storage process, it realizes the effective matching of wind energy and heat energy supply and demand, especially in an environment with abundant wind resources. This provides a clean and renewable energy option for high-temperature heat pump systems and avoids the impact of fluctuations in water heat sources on the system energy stability. With the help of efficient heat storage devices, electrical energy can be converted into thermal energy and stored when wind power generation is sufficient, and the stored thermal energy can be released when wind power generation is low or there is insufficient electricity at night, maintaining the stable operation of the high-temperature heat pump system, improving energy utilization efficiency, reducing system energy consumption, and reducing system operating costs, achieving significant environmental and economic benefits.

[0058] In a preferred embodiment of the present invention, the operation of the heat pump heat storage system is controlled according to the heat storage amount of the heat storage device, including: judging whether the heat storage amount of the heat storage device is greater than a first preset value; if so, controlling the heat storage device to release heat to provide heating for the user end; otherwise, starting the backup power supply mode to power the first-stage compressor 2. Under windless conditions, the system first checks the thermal energy storage capacity of the molten salt heat storage device 13. If the thermal energy storage capacity is greater than 30%, the system focuses on maximizing the utilization of the stored thermal energy, and the molten salt heat storage device 13 becomes the main source of thermal energy supply. The wind-driven system stops running, the electric valve 1 is closed, and the molten salt heat storage device 13 releases the thermal energy stored in the state of sufficient wind power, which is transmitted to the final thermal energy demand end through the fluid in the energy-saving tank 14. The high-temperature thermal energy of the molten salt is gradually transferred to the fluid in the energy-saving tank 14 through heat exchange, realizing a smooth transition from high-temperature thermal energy to preheating fluid, and ensuring the continuous supply of thermal energy. The preheated fluid in the energy-saving tank 14 further adjusts the matching of the heat release rate and the change in heat demand, so that the dynamic balance between heat supply and user demand can be maintained, which not only avoids overheating waste, but also ensures the stability and continuity of heat supply and demand, and improves the efficiency and economy of heat utilization. If the heat storage capacity is less than 30%, the system starts the first-stage compressor 2, uses the backup power supply, ensures the stability of the power supply, drives the first-stage compressor 2, and replenishes the heat storage as soon as possible.

[0059] Further, the backup power supply mode is started to supply power to the first-stage compressor, including: detecting whether there is a backup power supply; if there is a backup power supply, detecting whether the backup power supply is sufficient, and when the backup power supply is sufficient, using the backup power supply to supply power to the first-stage compressor; if there is no backup power supply or the backup power supply is insufficient, controlling the flywheel energy storage device to release mechanical energy to provide power for the first-stage compressor, and when the mechanical energy of the flywheel energy storage device is insufficient to drive the first-stage compressor, controlling the heat pump thermal storage system to shut down unnecessary loads. If there is no backup power supply or the backup power supply is insufficient, the system uses the mechanical energy released by the flywheel energy storage device 20 to directly drive the first-stage compressor 2 through the gear box 22 and the coupling 4. If the mechanical energy stored in the flywheel energy storage device 20 is insufficient to drive the first-stage compressor 2, the system determines whether the power demand of non-critical loads can be reduced. By reducing the power demand of non-critical loads, the normal operation of key equipment is prioritized. Adjust the system operation mode to ensure that the generation and storage of thermal energy are maximized under limited energy input.

[0060] In another preferred embodiment of the present invention, the current wind parameters include at least wind speed and wind direction; the operation of the heat pump thermal storage system is controlled according to the current wind parameters, including: when the wind speed reaches a preset wind speed and the wind direction is stable, controlling the wind turbine to provide mechanical energy to the first-stage compressor through a mechanical energy transmission device to drive the first-stage compressor to operate; when the wind speed does not reach the preset wind speed or the wind direction is unstable, controlling the thermal storage device to release heat to provide heating to the user end.

[0061] High-precision wind speed sensors and wind direction sensors are used to collect wind speed v and wind direction data in real time. For example, when the real-time wind speed v≥10m / s and the wind direction is stable, that is, when the wind is sufficient, the wind turbine 8 operates under strong wind conditions, and the system enters an efficient energy conversion and storage mode. The blades are driven by sufficient wind and rotate at a higher speed to generate more mechanical energy. When the output power of the wind turbine 8 is greater than the power required by the first-stage compressor 2, the mechanical energy is preferentially transferred to the first-stage compressor 2, and the mechanical energy is transferred to the impeller of the first-stage compressor 2 through the main drive shaft 18 and the gear box 22. The heat pump system operates in an efficient mode, absorbs low-grade heat energy from the ambient air, and preferentially starts the first-stage compressor 2. After starting the first-stage compressor 2, the working mode of the first-stage compressor 2 is an efficient heating mode, compressing the refrigerant to a high temperature and high pressure state, ensuring that the heat energy is quickly increased in the initial stage, the electric valve 2 is opened, and part of the heat energy directly serves industrial needs, ensuring the continuity and efficiency of industrial heat energy supply. The excess mechanical energy is transferred to the flywheel energy storage device 20 through the coupling 2 and stored in the flywheel. The remaining heat energy is stored in the molten salt heat storage device 13, which acts as an efficient heat storage device, and can store the heat energy converted from excess electric energy when the wind is strong, in preparation for subsequent use. Before the heat energy is released to the user device, the heat energy first passes through the energy-saving tank 14, and the fluid inside the energy-saving tank 14 is preheated to a temperature close to the heat energy user's demand, realizing the preliminary distribution of heat energy, reducing the burden on the final heating equipment, and improving energy utilization efficiency. When the wind is sufficient, there may be a difference between the heat energy release rate of the molten salt heat storage device 13 and the specific heat energy demand. Therefore, the energy-saving tank 14, as an energy buffer, plays a role in balancing the supply and demand of heat energy by storing preheated fluid, ensuring a smooth transition between heat energy release and utilization, and can improve the flexibility and stability of system operation.

[0062] When the real-time wind speed v is less than 10m / s or the wind direction is unstable, the wind energy captured by the wind turbine 8 is reduced, resulting in a decrease in the output mechanical energy and electrical energy, which may not be able to directly meet the energy demand required for the high heat production operation of the heat pump system. The power electronic converter 9 detects the decrease in electrical energy and works with the intelligent controller to adjust the heat pump operation strategy. The heat pump system reduces its dependence on the immediate generation of electrical energy, and preferentially releases the stored high-grade thermal energy from the molten salt thermal storage device 13 to meet the current heat demand. It changes from continuous operation to intermittent operation mode, or completely suspends operation, depending on the current level of thermal energy demand and the amount of stored thermal energy in the thermal storage device. In this case, the molten salt thermal storage device 13 maintains the continuity and stability of the thermal energy supply through the pre-stored thermal energy. At this time, the energy-saving tank 14 receives the thermal energy released by the molten salt thermal storage device 13 and heats it to a temperature close to the user's demand by preheating the fluid. After the fluid is preheated in the energy-saving tank 14, as a transition carrier of energy, it can quickly respond to changes in thermal energy demand, ensure the continuous supply of thermal energy, and reduce the energy consumption of the heat pump system to start heating again. The regulating function of the energy-saving tank 14 ensures a smooth transition between the supply and demand of thermal energy. Even when the wind weakens, the heat release rate can be dynamically adjusted to match the heat demand, thus avoiding interruption of heat supply and energy waste caused by overheating.

[0063] After driving the first-stage compressor to operate, it also includes: detecting whether the output power of the wind turbine is greater than the rated power of the first-stage compressor, if so, storing the excess mechanical energy in the flywheel energy storage device, otherwise, keeping the wind turbine to provide mechanical energy to the first-stage compressor through the mechanical energy transmission device; detecting whether the heat provided by the heat pump system meets the user's needs, if so, storing the excess heat in the heat storage device, otherwise, keeping the heat pump system to provide heating to the user end; detecting whether the heat storage capacity of the heat storage device is less than a second preset value, if so, controlling the wind turbine to power the second-stage compressor through the wind power generation device, otherwise, keeping the wind turbine to provide mechanical energy to the first-stage compressor through the mechanical energy transmission device.

[0064] The system monitors the thermal energy storage capacity of the molten salt thermal storage device 13 in real time through the temperature sensor 16, records the data in the system database, and determines whether the current thermal energy storage capacity is less than 30%. If the thermal energy storage capacity is less than 30%, the system will give priority to using wind power generation to drive the first-stage compressor 2 for heating, and the heat energy generated by the first-stage compressor 2 will be supplied to the current heat demand first. If the heat demand has been met, the remaining heat energy is stored in the molten salt thermal storage device 13. If the electrical energy input is insufficient, the system uses the mechanical energy released by the flywheel energy storage device 20 to directly drive the first-stage compressor 2 through the gear box 22 and the coupling 4. The system continuously monitors the thermal energy storage capacity of the molten salt thermal storage device 13.

[0065] If the thermal energy storage capacity has not yet reached 50% and the power input allows, the system is ready to start the second-stage compressor 3. The second-stage compressor 3 is driven by electric energy, receives the high-temperature and high-pressure refrigerant from the first-stage compressor 2, and further compresses the refrigerant to increase its temperature and pressure. The heat energy generated by the second-stage compressor 3 is also supplied to the current heat demand first. If the heat demand has been met, the remaining heat energy is stored in the molten salt thermal storage device 13. The system continuously monitors the wind speed and power input, and dynamically adjusts the operating status of the first-stage compressor 2 and the second-stage compressor 3 according to real-time data to ensure the overall efficiency and stability of the system.

[0066] Preferably, after controlling the operation of the heat pump thermal storage system according to the current wind parameters, it also includes: detecting whether the heat storage amount of the heat storage device is less than a third preset value; if so, controlling the wind turbine 8 to power the first-stage compressor 2 through the wind power generation device, and when the heat provided by the heat pump system meets the user's needs, storing the excess heat in the heat storage device, and when the heat provided by the heat pump system cannot meet the user's needs, providing mechanical energy to the first-stage compressor 2 through the flywheel energy storage device 20; otherwise, maintaining the current operating state.

[0067] If the thermal energy storage capacity is not less than 30%, the system maintains the current state, continues to monitor the thermal energy storage status, and adjusts the operating mode according to the operating status and needs of other systems to ensure the overall efficiency and stability of the system.

[0068] Further, after providing mechanical energy to the first-stage compressor through the flywheel energy storage device, it also includes: detecting whether the heat storage capacity of the heat storage device is less than the fourth preset value; if so, controlling the wind turbine to power the second-stage compressor through the wind power generation device, and storing the excess heat in the heat storage device when the heat provided by the heat pump system meets the user's needs; otherwise, maintaining the current operating state. The system will continue to detect the heat energy storage capacity of the molten salt heat storage device 13 in real time. If the heat energy storage capacity does not reach 80% and the electric energy provided by wind power generation is sufficient, the system is ready to start the second-stage compressor 3. The second-stage compressor 3 is driven by electric energy, and after stable conversion by the power electronic converter 9 and the frequency converter 10, the speed of the wind turbine 8 is adjusted to optimize the power generation efficiency, the electric valve 1 is opened, and the alternating current is supplied to the system. The second-stage compressor 3 receives the high-temperature and high-pressure refrigerant from the first-stage compressor 2, further compresses the refrigerant, and increases its temperature and pressure. The heat energy generated by the second-stage compressor 3 is also preferentially supplied to the current heat demand. If the heat demand has been met, the remaining heat energy is stored in the molten salt heat storage device 13.

[0069] The present invention intelligently integrates wind drive, heat pump technology and high-density heat storage mechanism, combined with intelligent prediction and scheduling algorithms, to achieve efficient conversion of wind energy and dynamic balance of heat supply and demand. Through the integration of high-temperature heat pump and molten salt thermal storage system, the thermal energy utilization rate and energy economic benefits of the system are significantly improved. The introduction of intelligent control strategy can adjust the system operation status in real time according to wind changes and heat demand fluctuations, realize peak shaving and valley filling of electricity and continuous supply of heat energy, solve the challenges brought by the instability of renewable energy, and provide innovative solutions for building intelligent, green and efficient energy systems.

[0070] Another heat pump thermal storage system control method is provided in a preferred embodiment 2 of the present invention. Specifically, Figure 3 An optional flow chart of the method is shown as follows: Figure 3 As shown, the method includes the following steps S301-S318:

[0071] S301: Start;

[0072] S302: Real-time detection of wind speed and direction. If the wind speed is high and the wind direction is stable, proceed to step S303; if the wind speed is low or the wind direction is unstable, proceed to step S307; if there is no wind, proceed to step S314;

[0073] S303: The wind turbine starts the full speed conversion mode;

[0074] S304: Highly efficient drive of mechanical and electrical energy;

[0075] S305: heat pump high heat production operation;

[0076] S306: high temperature thermal energy storage;

[0077] S307: Prioritize releasing stored thermal energy to meet thermal demand;

[0078] S308: Determine whether the current thermal energy storage capacity of the molten salt thermal storage device is less than 30%, if yes, proceed to step S309, otherwise proceed to step S313;

[0079] S309: Using wind power to drive the first stage compressor to generate heat and store it in a molten salt thermal storage device;

[0080] S310: Determine whether the current thermal energy storage capacity of the molten salt thermal storage device is less than 50%, if yes, proceed to step S311, otherwise proceed to step S312;

[0081] S311: using wind power to drive the second stage compressor to generate heat and store it in a molten salt thermal storage device;

[0082] S312: The system maintains the current state;

[0083] S313: The system maintains the current state;

[0084] S314: Determine whether the current thermal energy storage capacity of the molten salt thermal storage device is less than 30%, if yes, proceed to step S315, otherwise proceed to step S316;

[0085] S315: Using backup power or mechanical energy to drive the first stage compressor to generate heat;

[0086] S316: Turn on the heat storage system heat release mode;

[0087] S317: releasing stored energy;

[0088] S318: Meet heating needs.

[0089] The unit collects information such as the operating status of the wind turbine, heat pump system parameters, the status of the molten salt thermal storage device and environmental conditions through sensors, and uses algorithm analysis and prediction to generate operating instructions for the power converter, heat pump and molten salt thermal storage device, control electric valve 1 and electric valve 2, effectively coordinate the operation of various components in the system, maximize energy efficiency and economic benefits, and achieve effective coordination of wind drive and thermal energy storage.

[0090] Example 3

[0091] Based on the heat pump thermal storage system control method provided in the above-mentioned embodiment 2, a storage medium containing computer executable instructions is also provided in a preferred embodiment 3 of the present invention. When the computer executable instructions are executed by a computer processor, they are used to execute the heat pump thermal storage system control method as described above.

[0092] In the above embodiment, a heat pump heat storage system integrating wind power is provided, including a heat pump system, a heat storage device connected to the heat pump system, and used to use the heat released by the condenser to store heat and provide heating to the user end. In addition, it also includes a wind device connected to the compressor of the heat pump system, which is used to drive the compressor, store the excess heat energy generated by the heat pump system in the heat storage device when the wind is sufficient, and use the heat storage device to provide heating to the user end when the wind is insufficient. The above scheme integrates wind energy conversion, high-efficiency heat pumps, and high-density heat storage technologies. By optimizing the energy conversion and storage process, it realizes the effective matching of wind energy and heat energy supply and demand, especially in an environment with abundant wind resources. This provides a clean and renewable energy option for high-temperature heat pump systems and avoids the impact of fluctuations in water heat sources on the system energy stability. With the help of efficient heat storage devices, electrical energy can be converted into thermal energy and stored when wind power generation is sufficient, and the stored thermal energy can be released when wind power generation is low or there is insufficient electricity at night, maintaining the stable operation of the high-temperature heat pump system, improving energy utilization efficiency, reducing system energy consumption, and reducing system operating costs, achieving significant environmental and economic benefits.

[0093] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0094] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0095] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0096] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0097] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0098] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes.

[0099] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not invented by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0100] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A heat pump thermal storage system, characterized in that: include: A heat pump system, comprising a compressor, a condenser, a throttling device and an evaporator connected in sequence; A heat storage device, one end of which is connected to the condenser and the other end of which is connected to the user end, for storing heat using the heat released by the condenser and providing heat to the user end; A wind device is connected to the compressor and is used to drive the compressor. When the wind is sufficient, the excess heat energy generated by the heat pump system is stored in the heat storage device. When the wind is weak, the heat storage device is used to provide heat to the user end.

2. The heat pump thermal storage system according to claim 1, characterized in that: The heat storage device is a molten salt heat storage device; the condenser is also connected to the user end, and is used to use the heat released by the condenser to provide heat to the user end.

3. The heat pump thermal storage system according to claim 2, characterized in that: Also includes: An energy-saving tank is connected to the heat storage device and the condenser at one end and to the user end at the other end. The energy-saving tank contains a preheating fluid for heating the preheating fluid to a preset temperature using the heat energy of the heat storage device and the condenser for use by the user.

4. The heat pump thermal storage system according to claim 1, characterized in that: The compressor is a two-stage compression system, including a first-stage compressor and a second-stage compressor; the wind power device includes: Wind turbines; a mechanical energy transmission device, one end of which is connected to the wind turbine and the other end of which is connected to the first-stage compressor, for providing mechanical energy to the first-stage compressor to drive the first-stage compressor to operate; A wind power generation device is connected to the wind turbine at one end and connected to the first-stage compressor and the second-stage compressor at the other end, and is used to provide electrical energy to the first-stage compressor and the second-stage compressor to drive the first-stage compressor and the second-stage compressor to operate.

5. The heat pump thermal storage system according to claim 4, characterized in that: The wind power generation device comprises: A power electronic converter connected to the wind turbine and used for converting the three-phase alternating current output by wind power into direct current; A frequency converter, one end of which is connected to the power electronic converter, and the other end of which is connected to the first-stage compressor, is used to convert direct current into alternating current required by the first-stage compressor.

6. The heat pump thermal storage system according to claim 4, characterized in that: The mechanical energy transmission device includes: a main transmission shaft and a gear box, one end of the main transmission shaft is connected to the wind turbine, and the other end is connected to the gear box, and the gear box is connected to the impeller shaft of the first-stage compressor, and is used to convert the rotation of the wind turbine into the rotation speed required by the first-stage compressor to drive the first-stage compressor to operate.

7. The heat pump thermal storage system according to claim 6, characterized in that: The mechanical energy transmission device also includes: A flywheel energy storage device, located between the main transmission shaft and the gear box, is used to store mechanical energy when the wind is sufficient and release it when the wind is insufficient to provide power for the first stage compressor; The coupling includes a plurality of couplings, which are respectively located between the wind turbine and the main transmission shaft, between the main transmission shaft and the flywheel energy storage device, between the flywheel energy storage device and the gear box, and between the gear box and the impeller shaft of the first-stage compressor, for smoothly transmitting power.

8. A heat pump thermal storage system control method, applied to the heat pump thermal storage system according to any one of claims 1 to 7, characterized in that: The method comprises: Detecting current wind parameters, and determining whether there is wind according to the current wind parameters; When there is no wind, the operation of the heat pump heat storage system is controlled according to the heat storage amount of the heat storage device; When there is wind, the operation of the heat pump thermal storage system is controlled according to the current wind force parameter.

9. The method according to claim 8, characterized in that Controlling the operation of the heat pump heat storage system according to the heat storage amount of the heat storage device includes: Determining whether the heat storage amount of the heat storage device is greater than a first preset value; If yes, controlling the heat storage device to release heat to provide heating for the user end; Otherwise, the backup power supply mode is started to supply power to the first stage compressor.

10. The method according to claim 9, characterized in that The startup standby power supply mode supplies power to the first-stage compressor, including: Detecting the presence of backup power; If the backup power supply exists, detecting whether the backup power supply is sufficient, and if the backup power supply is sufficient, using the backup power supply to power the first-stage compressor; If the backup power supply does not exist or is insufficient, the flywheel energy storage device is controlled to release mechanical energy to provide power for the first-stage compressor, and when the mechanical energy of the flywheel energy storage device is insufficient to drive the first-stage compressor, the heat pump thermal storage system is controlled to shut down unnecessary loads.

11. The method according to claim 8, characterized in that The current wind force parameters include at least wind speed and wind direction; and controlling the operation of the heat pump thermal storage system according to the current wind force parameters includes: When the wind speed reaches a preset wind speed and the wind direction is stable, controlling the wind turbine to provide mechanical energy to the first-stage compressor through the mechanical energy transmission device to drive the first-stage compressor to operate; When the wind speed does not reach the preset wind speed or the wind direction is unstable, the heat storage device is controlled to release heat to provide heating for the user end.

12. The method according to claim 11, characterized in that After driving the first-stage compressor to operate, the method further comprises: Detecting whether the output power of the wind turbine is greater than the rated power of the first-stage compressor, and if so, storing the excess mechanical energy in a flywheel energy storage device, otherwise, keeping the wind turbine providing mechanical energy to the first-stage compressor through the mechanical energy transmission device; Detecting whether the heat provided by the heat pump system meets the user's needs, if so, storing the excess heat in the heat storage device, otherwise, keeping the heat pump system to provide heat to the user end; Detect whether the heat storage amount of the heat storage device is less than a second preset value. If so, control the wind turbine to supply power to the second-stage compressor through the wind power generation device; otherwise, keep the wind turbine to provide mechanical energy to the first-stage compressor through the mechanical energy transmission device.

13. The method according to claim 11, characterized in that After controlling the operation of the heat pump thermal storage system according to the current wind force parameter, the method further includes: Detecting whether the heat storage amount of the heat storage device is less than a third preset value; If yes, control the wind turbine to supply power to the first-stage compressor through the wind power generation device, and when the heat provided by the heat pump system meets the user's demand, store the excess heat in the heat storage device, and when the heat provided by the heat pump system cannot meet the user's demand, provide mechanical energy to the first-stage compressor through the flywheel energy storage device; Otherwise, keep the current running state.

14. The method according to claim 13, characterized in that After providing mechanical energy to the first-stage compressor through the flywheel energy storage device, the method further includes: Detecting whether the heat storage amount of the heat storage device is less than a fourth preset value; If yes, controlling the wind turbine to power the second-stage compressor through the wind power generation device, and storing excess heat in the heat storage device when the heat provided by the heat pump system meets user demand; Otherwise, keep the current running state.

15. A storage medium containing computer executable instructions, characterized in that: The computer executable instructions are used to execute the heat pump thermal storage system control method according to any one of claims 8 to 14 when executed by a computer processor.

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