Cold region solar energy integrated electricity and heat combined supply system and control method

Abstract

The invention discloses a cold region solar energy integrated electricity and heat combined supply system and a control method. A cold region solar integrated electricity and heat combined supply system comprises a solar photoelectric system and a solar heat collection and supply system, the solar photoelectric system is used for converting solar energy into electric energy and transmitting the electric energy to an electric load, and the solar heat collection and supply system is used for converting solar energy into heat energy and transmitting the heat energy to a heat load; the system further comprises electricity storage equipment and heat storage equipment, the electricity storage equipment is connected with the solar photoelectric system so as to store redundant electric energy in the electricity storage equipment, and the heat storage equipment is connected with the solar photoelectric system and the solar heat collection and supply system so as to store the redundant electric energy in the electricity storage equipment. Redundant electric energy is converted into heat energy, the heat energy is stored in the heat storage equipment, and redundant heat energy is stored in the heat storage equipment; and the heat storage equipment is connected with the thermal load so as to supply heat to the thermal load. Electric energy and heat energy can be stored, and the energy conversion and utilization efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of solar energy utilization, and in particular relates to a cold-region solar integrated electric heat and power generation system and a control method. Background Art

[0002] For remote and cold areas at high altitudes, the heating network is difficult to cover effectively and the cost of using heat is high. The power grid can cover some areas, but the heat and electricity supply are often cut off due to power grid failures, which brings a lot of inconvenience to life.

[0003] In the related technology, solar energy is used for power and heat supply. However, the solar energy illumination time is limited, and the temperature difference between day and night is large in high-altitude and cold regions, which can easily lead to heat interruption. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] The inventors realized that when solar power supply and heating are two relatively independent operating systems, it is impossible to effectively coordinate the conversion of energy between the two. In the face of some extreme weather conditions, such as continuous rainy weather or low temperature weather for many days, heating and power supply cannot be achieved.

[0006] The inventors also realized that in the related art, when the power generation power of the solar photovoltaic module and the heat collection power of the solar thermal collection module are large, measures are often taken to limit the power generation of the photovoltaic module and the heat collection capacity of the thermal collection module to ensure the smooth operation of the system, and the operating efficiency of the photovoltaic module and the thermal collection module is low.

[0007] To this end, an embodiment of the present invention provides a cold-region solar integrated electric-heat cogeneration system with a high degree of integration of solar power supply and solar heat supply.

[0008] The embodiment of the present invention also provides a control method for a cold-region solar integrated electric-heat cogeneration system.

[0009] The cold-region solar integrated electric and thermal power generation system of the embodiment of the present invention comprises a solar photovoltaic system and a solar thermal collection and heating system, wherein the solar photovoltaic system is used to convert solar energy into electrical energy and transmit the electrical energy to an electrical load, and the solar thermal collection and heating system is used to convert solar energy into thermal energy and transmit the thermal energy to a thermal load;

[0010] Also includes:

[0011] An electric storage device and a heat storage device, wherein the electric storage device is connected to the solar photovoltaic system to store excess electric energy in the electric storage device, and the heat storage device is connected to the solar photovoltaic system and the solar thermal heating system to convert excess electric energy into heat energy and store it in the heat storage device, and to store excess heat energy in the heat storage device;

[0012] The heat storage device is connected to a thermal load to supply heat to the thermal load.

[0013] The cold-region solar integrated electric heat and power supply system of the embodiment of the present invention can store electric energy and thermal energy by configuring electric storage equipment and thermal storage equipment. At the same time, when the electric energy meets the power consumption of the power load and the electric storage equipment, it can be converted into thermal energy and stored in the thermal storage equipment, thereby ensuring the heat demand in the cold region, realizing continuous heating in the cold region throughout the day, optimizing solar energy heating and power supply, improving the integration between the two, and improving energy conversion and utilization efficiency.

[0014] In some embodiments, the solar photovoltaic system includes a photovoltaic module, a junction box, a photovoltaic storage integrated machine and a distribution box, wherein the photovoltaic module is used to convert solar energy into electrical energy, the junction box is connected between the photovoltaic storage integrated machine and the photovoltaic module, the junction box is used to collect the current generated by the photovoltaic module and transmit it to the photovoltaic storage integrated machine, and the photovoltaic storage integrated machine is connected to the power load through the distribution box;

[0015] The electricity storage device is connected to the integrated photovoltaic and thermal storage device, and the heat storage device is connected to the power distribution box.

[0016] In some embodiments, the power storage device is a cabin and a battery, the battery is arranged in the cabin, a heating coil is provided in the cabin, and the heating coil is connected to the solar thermal heating system or the heat storage device to heat the cabin and make the temperature in the cabin not less than a preset threshold.

[0017] In some embodiments, the integrated photovoltaic and storage device has an on-grid and off-grid switching cabinet;

[0018] And / or, it also includes a power grid, which is connected to the distribution box.

[0019] In some embodiments, the heat storage equipment includes a phase change heat storage device and an electric boiler, and the number of the phase change heat storage devices is multiple.

[0020] In some embodiments, the solar thermal heating system includes a collector assembly, a first heat exchanger and a hot water storage tank. The collector assembly and the hot water storage tank are both connected to the first heat exchanger so that the first working fluid in the collector assembly and the second working fluid in the hot water storage tank can exchange heat. The hot water storage tank is connected to a thermal load.

[0021] In some embodiments, the heat storage device is connected to the first heat exchanger so that the first working fluid in the collector assembly and the third working fluid in the heat storage device perform heat exchange in the first heat exchanger.

[0022] In some embodiments, it further comprises a heat exchange coil, wherein the heat exchange coil is arranged in the heat storage tank and / or the heat storage device, one end of the heat exchange coil is connected to the domestic water source, and the other end is connected to the domestic hot water end;

[0023] And / or, it also includes a measurement and control system, which is connected to the solar photovoltaic system and the solar thermal heating system;

[0024] And / or, further comprising a detection component, the number of the detection components is multiple, and the detection component is used to detect the temperatures of multiple temperature measurement points in the solar thermal heating system and the heat storage device;

[0025] And / or, it also includes a heating belt, and the heating belt coil is arranged on at least a part of the working fluid pipeline in the solar thermal collection and heating system.

[0026] The control method of the cold-region solar integrated electric heat and power generation system of the embodiment of the present invention is used for any of the above-mentioned control methods of the cold-region solar integrated electric heat and power generation system, including:

[0027] The solar photovoltaic system converts solar energy into electrical energy and transmits it to the electrical load;

[0028] Determining whether the power generated by the solar photovoltaic system is greater than the power load;

[0029] If so, part of the electric energy generated by the solar photovoltaic system is transmitted to the electric storage device;

[0030] Determining whether the power generated by the solar photovoltaic system is greater than the sum of the power load and the charging power of the power storage device;

[0031] If so, part of the electric energy generated by the solar photovoltaic system is transmitted to the thermal storage device;

[0032] Determining whether the power generated by the solar photovoltaic system is less than the power load;

[0033] If so, the solar photovoltaic system and the power storage device are used to supply power to the power load simultaneously;

[0034] Determining whether the power generated by the solar photovoltaic system and the power supplied by the power storage device are less than the power load;

[0035] If so, the power grid is used to supply power to the power load;

[0036] The solar thermal collection and heating system converts solar energy into thermal energy and transmits it to the thermal load;

[0037] Determining whether the temperature in the hot water storage tank is greater than a first temperature threshold;

[0038] If so, part of the heat energy generated by the solar thermal heating system is stored in the heat storage device;

[0039] Determining whether the temperature in the hot water storage tank is less than a second temperature threshold, wherein the second temperature threshold is less than the first temperature threshold;

[0040] If yes, the heat energy in the heat storage device is transferred to the thermal load;

[0041] Determining whether the temperatures in the hot water storage tank and the heat storage device are both lower than a second temperature threshold;

[0042] If so, the working medium in the hot water storage tank is electrically heated, and the heat energy in the hot water storage tank is transferred to the thermal load.

[0043] In some embodiments, it also includes:

[0044] Determining whether the temperature of the first working fluid between the collector assembly and the first heat exchanger in the solar thermal heating system is less than a third temperature threshold;

[0045] If so, the heat energy in the heat storage device is transferred to the first heat exchanger, and the first working fluid between the first heat exchanger and the collector assembly is driven to circulate, so that the temperature of the first working fluid reaches a fourth temperature threshold, and the fourth temperature threshold is greater than the third temperature threshold;

[0046] Determine whether the temperature of the first working fluid between the collector assembly and the first heat exchanger in the solar thermal heating system is less than a third temperature threshold, and the temperature of the working fluid in the heat storage device is less than a fifth temperature threshold, and the fifth temperature threshold is greater than the fourth temperature threshold and less than the second temperature threshold;

[0047] If so, the heating tape is started to heat the first working fluid between the first heat exchanger and the collector assembly to a fourth temperature threshold. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is a structural schematic diagram of a cold-region solar integrated electric heat and power generation system according to an embodiment of the present invention.

[0049] Reference numerals:

[0050] 1. Solar photovoltaic system; 11. Photovoltaic module; 12. Combiner box; 13. Photovoltaic storage integrated machine; 14. Distribution box;

[0051] 2. Solar thermal collection heating system; 21. Collector assembly; 22. First heat exchanger; 23. Hot water storage tank;

[0052] 3. Power storage equipment;

[0053] 4. Heat storage equipment;

[0054] 5. Power load;

[0055] 6. Thermal load;

[0056] 7. Power grid. DETAILED DESCRIPTION

[0057] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0058] See also Figure 1 The cold-region solar integrated electric heat and power supply system of the embodiment of the present invention includes a solar photovoltaic system 1 and a solar thermal collection and heating system 2. The solar photovoltaic system 1 is used to convert solar energy into electrical energy and transmit the electrical energy to the power load 5, and the solar thermal collection and heating system 2 is used to convert solar energy into thermal energy and transmit the thermal energy to the thermal load 6.

[0059] The cold-region solar integrated electric heat and power supply system also includes an electric storage device 3 and a heat storage device 4. The electric storage device 3 is connected to the solar photovoltaic system 1 to store excess electric energy in the electric storage device 3. The heat storage device 4 is connected to the solar photovoltaic system 1 and the solar thermal collection heating system 2 to convert excess electric energy into thermal energy and store it in the heat storage device 4, and to store excess thermal energy in the heat storage device 4. The heat storage device 4 is connected to the thermal load 6 to supply heat to the thermal load 6.

[0060] The cold-region solar integrated electric and thermal power generation system of the embodiment of the present invention can store electric energy and thermal energy by configuring the electric storage device 3 and the thermal storage device 4. At the same time, when the electric energy meets the power consumption of the power load 5 and the electric storage device 3, it can be converted into thermal energy and stored in the thermal storage device 4, thereby ensuring the heat demand in the cold regions, realizing continuous heating in the cold regions throughout the day, optimizing solar energy heating and power supply, improving the integration between the two, and improving energy conversion and utilization efficiency.

[0061] The embodiment of the present invention enables the solar photovoltaic system 1 and the solar thermal heating system 2 to operate stably under sufficient sunlight, store electrical energy and thermal energy, improve the conversion efficiency of solar energy, ensure the electricity and heat demand when sunlight is insufficient, and extend the continuous supply time of thermal electricity.

[0062] Due to the high altitude, harsh climate and large temperature difference between day and night in high-cold areas, when there is continuous lack of light, it is easy to cause power outages and heat outages. Due to climatic reasons, this situation occurs frequently, bringing great inconvenience to life. The embodiments of the present invention improve the ability to cope with extreme weather and increase the power supply and heating time. Compared with the separately operated solar power supply and heating systems in related technologies, more efficient energy conversion and application can be achieved, and the power supply time, heating time and quality of thermal energy can be effectively extended.

[0063] In some embodiments, the solar photovoltaic system 1 includes a photovoltaic module 11, a junction box 12, a photovoltaic storage machine 13 and a distribution box 14. The photovoltaic module 11 is used to convert solar energy into electrical energy. The junction box 12 is connected between the photovoltaic storage machine 13 and the photovoltaic module 11. The junction box 12 is used to collect the current generated by the photovoltaic module 11 and transmit it to the photovoltaic storage machine 13. The photovoltaic storage machine 13 is connected to the power load through the distribution box 14; the power storage device 3 is connected to the photovoltaic storage machine 13, and the heat storage device 4 is connected to the distribution box 14.

[0064] The electric energy generated by the photovoltaic module 11 is supplied to the power load 5 first, and the excess electric energy can be stored in the power storage device 3. When there is sufficient sunlight, after meeting the power requirements of the power load 5 and the power storage device 3, if there is still excess electric energy, there is no need to shut down some of the photovoltaic modules 11. Instead, the excess electric energy is converted into heat energy and stored through the heat storage device 4 to ensure the heat demand and heat quality in high-altitude areas.

[0065] Furthermore, the photovoltaic and energy storage integrated machine 13 of the embodiment of the present invention has an on-grid and off-grid switching cabinet, and the distribution box 14 of the embodiment of the present invention is connected to the power grid 7, which can achieve grid connection without feeding into the grid. When the electric energy generated by the solar photovoltaic system 1 and the electric energy in the energy storage device 3 cannot meet the power load, the power grid 7 can be used for power supply.

[0066] In addition, the embodiments of the present invention can also store electricity according to the peak and valley periods of electricity consumption. When there is insufficient sunlight, the electric energy can be stored during the low-consumption period, or the electric energy can be converted into thermal energy and stored in the heat storage device 4, so as to ensure the normal operation of the power load 5 and the thermal load 6 in the cold area and reduce the cost of electricity and heat.

[0067] In some embodiments, the power storage device 3 is a cabin and a battery. The battery is arranged in the cabin. A heating coil is provided in the cabin. The heating coil is connected to the solar thermal heating system 2 or the heat storage device 4 to heat the cabin and make the temperature in the cabin not less than a preset threshold.

[0068] The performance of the battery in the power storage device 3 is greatly affected in low temperature weather, especially in high-altitude cold areas. When the ambient temperature of the battery is too low, the efficiency of electric energy utilization will be seriously affected, which can easily lead to misjudgment of the control system, resulting in a rapid drop in power and a power outage.

[0069] The embodiment of the present invention arranges a cabin, arranges the battery in the cabin, and uses a heating coil to heat the cabin, thereby ensuring that the environment in which the battery is located is at a relatively suitable temperature, thereby improving the conversion efficiency of the battery's energy storage and release.

[0070] In application, the heating coil can be connected to the solar thermal heating system 2, and the heat converted by the solar thermal system can be used to heat the heating coil. The heat in the heat storage device 4 can also be used, or part of the electrical energy can be directly used to maintain the temperature in the cabin.

[0071] Optionally, the preset threshold in the embodiment of the present invention is 15 degrees Celsius to 25 degrees Celsius. For example, the temperature in the cabin is set to 15 degrees Celsius, 18 degrees Celsius, 20 degrees Celsius, 22 degrees Celsius or 25 degrees Celsius.

[0072] The cabin can be a separate room or a box arranged in a room.

[0073] In some embodiments, the heat storage device 4 includes a phase change heat storage device and an electric boiler, and the number of the phase change heat storage devices is multiple.

[0074] The embodiment of the present invention uses phase change materials for heat storage, which can store a large amount of high-quality heat, and the temperature of the phase change material remains almost stable during the phase change process, which can provide stable heating capacity. Since the heat storage density of the phase change material is large, the required equipment volume is relatively small, which is convenient for transportation in high-altitude areas.

[0075] The electric boiler is used to convert the excess electric energy in the solar photovoltaic system 1 into thermal energy and store it through the phase change material of the phase change heat storage device.

[0076] There are multiple phase change heat storage devices, and the model, heat storage capacity and number of the phase change heat storage devices can be determined based on the heat demand, the power generation power of the photovoltaic component 11, the power load, the collection power of the collector component 21, etc., to ensure that the solar photovoltaic system 1 and the solar thermal heating system 2 can operate efficiently and stably.

[0077] In some embodiments, the solar thermal heating system 2 includes a collector assembly 21, a first heat exchanger 22 and a hot water storage tank 23. The collector assembly 21 and the hot water storage tank 23 are both connected to the first heat exchanger 22 so that the first working fluid in the collector assembly 21 and the second working fluid in the hot water storage tank 23 can exchange heat. The hot water storage tank 23 is connected to the thermal load 6.

[0078] The collector assembly 21 in the embodiment of the present invention is used to convert solar energy into thermal energy. The first working fluid in the collector assembly 21 uses antifreeze to prevent the first working fluid from freezing and improve the stability of the system. The first working fluid exchanges heat with the second working fluid in the hot water storage tank 23 to achieve thermal energy storage, and then the thermal energy is transported to the thermal load 6 through the circulation pipeline between the hot water storage tank 23 and the thermal load 6.

[0079] In the embodiment of the present invention, since a heat storage device 4 is arranged, the excess heat energy generated by the collector assembly 21 can be stored in the heat storage device 4, thereby reducing the volume of the hot water storage tank 23, avoiding the hot water storage tank 23 from bearing excessive heat storage capacity, and making the hot water storage tank 23 act as a heat energy transfer, which can more effectively play a coordinating role in the solar thermal collection and heating system 2.

[0080] The collector assembly 21 can transfer heat energy to the hot water storage tank 23 and the heat storage device 4 through heat exchange at the same time, or it can transfer heat energy through heat exchange separately, and the flow in different pipelines can be adjusted by control valves and flow meters to achieve flow control.

[0081] Therefore, the hot water storage tank 23 can be designed to be miniaturized to reduce heat loss and improve the thermal energy quality of the hot water storage tank 23. During the startup phase of the solar thermal heating system 2, it can achieve rapid startup, avoiding the problem of the hot water storage tank 23 being too large, resulting in a long startup time, and avoiding excessive waste of low-quality heat energy after the temperature of the hot water storage tank 23 drops to a certain temperature at night.

[0082] Optionally, the thermal load 6 may be floor heating pipes, radiators, fan coil units, etc.

[0083] Furthermore, the heat storage device 4 is connected to the first heat exchanger 22 so that the first working fluid in the collector assembly 21 and the third working fluid in the heat storage device 4 can perform heat exchange in the first heat exchanger 22 .

[0084] It should be understood that the collector assembly 21 is connected to the hot side of the first heat exchanger 22, the heat storage device 4 is connected to the cold side of the first heat exchanger 22, and the hot water storage tank 23 is also connected to the cold side of the first heat exchanger 22. When the thermal energy of the collector assembly 21 meets the needs of the hot water storage tank 23, the excess thermal energy can be stored in the heat storage device 4.

[0085] When the thermal energy generated by the collector assembly 21 is insufficient to meet the thermal load 6 , the thermal energy in the heat storage device 4 can be supplied to the thermal load 6 .

[0086] When the temperature of the first working medium in the heat collector assembly 21 is too low and there is a risk of freezing, the heat energy in the heat storage device 4 can be used to reversely heat the first working medium between the heat collector assembly 21 and the first heat exchanger 22. At the same time, the embodiment of the present invention can use the low-quality heat energy in the hot water storage tank 23 and the heat storage device 4 to heat the first working medium in the heat collector assembly 21, and maintain the first working medium at a safe temperature above the anti-freezing temperature, for example, to ensure that the first working medium is above 6 degrees Celsius to 12 degrees Celsius.

[0087] In some embodiments, the cold-region solar integrated electric heat and power generation system also includes a heat exchange coil, which is arranged in the hot water storage tank 23 and / or the heat storage device 4, one end of the heat exchange coil is connected to the domestic water source, and the other end is connected to the domestic hot water end.

[0088] The heat exchange coil is placed in the hot water storage tank 23 and / or the heat storage device 4 to heat domestic water, and can be separated from the working fluid in the hot water storage tank 23 and the heat storage device 4 to ensure the cleanliness of domestic water and prevent it from being contaminated by other working fluids. In high-altitude cold areas, it can provide a continuous and stable hot water supply and improve the quality of life.

[0089] Furthermore, the cold-region solar integrated electric heat and power generation system also includes a measurement and control system, which is connected to the solar photovoltaic system 1 and the solar thermal heating system 2, and is used to regulate the solar photovoltaic system 1 and the solar thermal heating system 2 to achieve centralized control and facilitate the arrangement and execution of different operation strategies.

[0090] Furthermore, the cold-region solar integrated electric heat and power generation system further includes a detection component, the number of which is multiple, and the detection component is used to detect the temperature of multiple temperature measurement points in the solar thermal collection heating system 2 and the heat storage device 4. The detection component is used to perform temperature detection on different temperature measurement points to facilitate the normal and orderly operation of the system.

[0091] Furthermore, the cold-region solar integrated electric heat and power generation system further includes a heating belt, and the heating belt coil is arranged on at least part of the working fluid pipeline in the solar thermal collection and heating system 2. The heating belt is used to heat the working fluid pipeline to prevent the working fluid pipeline from freezing or rupture.

[0092] The control method of the cold-region solar integrated electric heat and power generation system of the embodiment of the present invention is used for any of the above-mentioned control methods of the cold-region solar integrated electric heat and power generation system, including:

[0093] The solar photovoltaic system converts solar energy into electrical energy and transmits it to the power load; the current working condition is that there is sunlight during the day, the solar photovoltaic system operates normally, and the electrical energy converted from solar energy is supplied to the power load for operation.

[0094] Determine whether the power generated by the solar photovoltaic system is greater than the power load;

[0095] If yes, part of the electricity generated by the solar photovoltaic system is transmitted to the power storage device. The current working condition is the power storage mode. When the power generation of the solar photovoltaic system is greater than the power load, the excess electricity can be stored in the power storage device for use when there is insufficient sunlight or no sunlight.

[0096] Determine whether the power generated by the solar photovoltaic system is greater than the sum of the charging power of the power load and the power storage device;

[0097] If so, part of the electricity generated by the solar photovoltaic system is transmitted to the heat storage device. The current working condition is the heat storage mode of the solar photovoltaic system. When the sunlight is sufficient and the power generation of the solar photovoltaic system meets the power load and the power storage device, there is no need to limit the power generation of the photovoltaic module through the integrated photovoltaic storage device. Instead, the electrical energy is converted into heat energy and stored through the heat storage device to meet the heat demand in cold areas and solve the problem of high heat demand in cold areas.

[0098] The embodiments of the present invention ensure that the solar photovoltaic system as a whole is in a stable and efficient operating state, and can achieve higher energy conversion.

[0099] Determine whether the power generated by the solar photovoltaic system is less than the power load;

[0100] If so, the solar photovoltaic system and the power storage device are used to supply power to the power load at the same time. When the current working condition is insufficient sunlight or no sunlight, the electric energy stored in the power storage device is used to supplement the power supply to the power load.

[0101] Determine whether the power generation power of the solar photovoltaic system and the power supply power of the power storage device are less than the power load;

[0102] If so, the power grid is used to supply power to the power load. The current working condition is that when the power storage device is exhausted and there is insufficient or no sunlight, the power grid is used to supply power to solve the problem of insufficient solar power generation and power storage in extreme environments.

[0103] The solar thermal heating system converts solar energy into thermal energy and transmits it to the thermal load; when the current working condition is that there is sunlight during the day, the solar thermal heating system provides heating normally.

[0104] Determining whether the temperature in the hot water storage tank is greater than a first temperature threshold;

[0105] If so, part of the heat energy generated by the solar thermal heating system is stored in the heat storage device. When the temperature of the hot water storage tank under the current working condition is greater than the first temperature threshold and no more excess heat energy can be stored, the excess heat energy of the collector assembly can be stored in the heat storage device using phase change materials.

[0106] The first temperature threshold may be 60 to 80 degrees Celsius.

[0107] Determining whether the temperature in the hot water storage tank is less than a second temperature threshold, wherein the second temperature threshold is less than the first temperature threshold;

[0108] If yes, the heat energy in the heat storage device is transferred to the thermal load. If the current working condition is that the temperature in the hot water storage tank is too low, the light is insufficient or there is no light, and the collector assembly cannot provide sufficient heat energy for the thermal load, then the heat storage device needs to be used to supply heat to the thermal load.

[0109] The second temperature threshold may be 30 degrees Celsius to 40 degrees Celsius.

[0110] Determine whether the temperatures in the hot water storage tank and the heat storage device are both less than a second temperature threshold;

[0111] If so, the working fluid in the hot water storage tank is electrically heated, and the heat energy in the hot water storage tank is transferred to the thermal load. The current working condition is that the temperature in the hot water storage tank and the heat storage device is too low, the light is insufficient or there is no light, and the solar thermal heating system cannot provide heat for the thermal load, so electric heating is used for heating. At this time, since the volume of the hot water storage tank can be designed to be relatively small, the working fluid circulation efficiency and heat utilization rate between the hot water storage tank and the thermal load can be improved.

[0112] Furthermore, the control method of the cold region solar integrated electric heat and power generation system also includes:

[0113] Determining whether the temperature of the first working fluid between the collector assembly and the first heat exchanger in the solar thermal heating system is less than a third temperature threshold;

[0114] If so, the heat energy in the heat storage device is transported to the first heat exchanger, and the first working fluid is driven to circulate between the first heat exchanger and the collector assembly so that the temperature of the first working fluid reaches a fourth temperature threshold, which is greater than the third temperature threshold.

[0115] The current working condition is that the temperature of the first working fluid in some pipelines between the outdoor collector assembly and the first heat exchanger is too low, and there is a risk of freezing. At this time, the first working fluid needs to be heated, and the heat energy in the heat storage device can be used to reversely heat the first working fluid.

[0116] The third temperature threshold can be 6 degrees Celsius to 12 degrees Celsius, and the fourth temperature threshold can be 13 degrees Celsius to 15 degrees Celsius; for example, the third temperature threshold is 6 degrees Celsius, and the fourth temperature threshold is 13 degrees Celsius. For another example, the third temperature threshold is 12 degrees Celsius, and the fourth temperature threshold is 15 degrees Celsius.

[0117] Determine whether the temperature of the first working fluid between the collector assembly and the first heat exchanger in the solar thermal heating system is less than a third temperature threshold, and the temperature of the working fluid in the heat storage device is less than a fifth temperature threshold, and the fifth temperature threshold is greater than the fourth temperature threshold and less than the second temperature threshold;

[0118] If so, the heating tape is started to heat the first working fluid between the first heat exchanger and the collector assembly to a fourth temperature threshold.

[0119] The current operating condition is that the temperature of the first working fluid in some pipelines between the outdoor collector assembly and the first heat exchanger is too low, and there is a risk of freezing. The heat in the heat storage device cannot meet the heating demand for the first working fluid, so it is necessary to start electric heating and use the heating tape to heat the first working fluid in the pipeline.

[0120] The fifth temperature threshold may be 18 degrees Celsius to 30 degrees Celsius, at which point the quality of the thermal energy in the heat storage device is low and the first working fluid cannot be heated by heat exchange.

[0121] The embodiments of the present invention can automatically execute under different working conditions by formulating different strategies, thereby ensuring the stability of the system and greatly reducing the occurrence of power outages and heat failures.

[0122] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0123] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0124] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0125] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0126] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0127] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A cold-region solar integrated electric heat and power generation system, characterized in that: It includes a solar photovoltaic system and a solar thermal heating system. The solar photovoltaic system is used to convert solar energy into electrical energy and transmit the electrical energy to the electrical load, and the solar thermal heating system is used to convert solar energy into thermal energy and transmit the thermal energy to the thermal load; Also includes: An electric storage device and a heat storage device, wherein the electric storage device is connected to the solar photovoltaic system to store excess electric energy in the electric storage device, and the heat storage device is connected to the solar photovoltaic system and the solar thermal heating system to convert excess electric energy into heat energy and store it in the heat storage device, and to store excess heat energy in the heat storage device; The heat storage device is connected to a thermal load to supply heat to the thermal load.

2. The cold region solar integrated electric heat and power generation system according to claim 1 is characterized in that: The solar photovoltaic system includes a photovoltaic module, a junction box, a photovoltaic storage integrated machine and a distribution box. The photovoltaic module is used to convert solar energy into electrical energy. The junction box is connected between the photovoltaic storage integrated machine and the photovoltaic module. The junction box is used to collect the current generated by the photovoltaic module and transmit it to the photovoltaic storage integrated machine. The photovoltaic storage integrated machine is connected to the power load through the distribution box. The electricity storage device is connected to the integrated photovoltaic and thermal storage device, and the heat storage device is connected to the power distribution box.

3. The cold region solar integrated electric heat and power generation system according to claim 2 is characterized in that: The power storage device comprises a cabin and a battery, wherein the battery is arranged in the cabin, and a heating coil is provided in the cabin, wherein the heating coil is connected to the solar thermal heating system or the heat storage device to heat the cabin and make the temperature in the cabin not less than a preset threshold.

4. The cold region solar integrated electric heat and power generation system according to claim 2, characterized in that: The photovoltaic and storage integrated machine has an on-grid and off-grid switching cabinet; And / or, it also includes a power grid, which is connected to the distribution box.

5. The cold region solar integrated electric heat and power generation system according to claim 2, characterized in that: The heat storage equipment includes a phase change heat storage device and an electric boiler, and the number of the phase change heat storage devices is multiple.

6. The cold region solar integrated electric heat and power generation system according to claim 1, characterized in that: The solar thermal collection and heating system includes a collector assembly, a first heat exchanger and a hot water storage tank. The collector assembly and the hot water storage tank are both connected to the first heat exchanger so that a first working medium in the collector assembly and a second working medium in the hot water storage tank can exchange heat. The hot water storage tank is connected to a thermal load.

7. The cold region solar integrated electric heat and power generation system according to claim 6, characterized in that: The heat storage device is connected to the first heat exchanger so that the first working fluid in the collector assembly and the third working fluid in the heat storage device perform heat exchange in the first heat exchanger.

8. The cold region solar integrated electric heat and power generation system according to claim 6, characterized in that: It also includes a heat exchange coil, which is arranged in the hot water storage tank and / or the heat storage device, one end of the heat exchange coil is connected to the domestic water source, and the other end is connected to the domestic hot water end; And / or, it also includes a measurement and control system, which is connected to the solar photovoltaic system and the solar thermal heating system; And / or, further comprising a detection component, the number of the detection components is multiple, and the detection component is used to detect the temperatures of multiple temperature measurement points in the solar thermal heating system and the heat storage device; And / or, it also includes a heating belt, and the heating belt coil is arranged on at least a part of the working fluid pipeline in the solar thermal collection and heating system.

9. A control method for a cold-region solar integrated electric heat and power generation system, characterized in that: A control method for a cold-region solar integrated electric heat and power generation system according to any one of claims 1 to 8, comprising: The solar photovoltaic system converts solar energy into electrical energy and transmits it to the electrical load; Determining whether the power generated by the solar photovoltaic system is greater than the power load; If so, part of the electric energy generated by the solar photovoltaic system is transmitted to the electric storage device; Determining whether the power generated by the solar photovoltaic system is greater than the sum of the power load and the charging power of the power storage device; If so, part of the electric energy generated by the solar photovoltaic system is transmitted to the thermal storage device; Determining whether the power generated by the solar photovoltaic system is less than the power load; If so, the solar photovoltaic system and the power storage device are used to supply power to the power load simultaneously; Determining whether the power generated by the solar photovoltaic system and the power supplied by the power storage device are less than the power load; If so, the power grid is used to supply power to the power load; The solar thermal collection and heating system converts solar energy into thermal energy and transmits it to the thermal load; Determining whether the temperature in the hot water storage tank is greater than a first temperature threshold; If so, part of the heat energy generated by the solar thermal heating system is stored in the heat storage device; Determining whether the temperature in the hot water storage tank is less than a second temperature threshold, wherein the second temperature threshold is less than the first temperature threshold; If yes, the heat energy in the heat storage device is transferred to the thermal load; Determining whether the temperatures in the hot water storage tank and the heat storage device are both lower than a second temperature threshold; If so, the working medium in the hot water storage tank is electrically heated, and the heat energy in the hot water storage tank is transferred to the thermal load.

10. The control method of the cold region solar integrated electric heat and power generation system according to claim 9, characterized in that: Also includes: Determining whether the temperature of the first working fluid between the collector assembly and the first heat exchanger in the solar thermal heating system is less than a third temperature threshold; If so, the heat energy in the heat storage device is transferred to the first heat exchanger, and the first working fluid between the first heat exchanger and the collector assembly is driven to circulate, so that the temperature of the first working fluid reaches a fourth temperature threshold, and the fourth temperature threshold is greater than the third temperature threshold; Determine whether the temperature of the first working fluid between the collector assembly and the first heat exchanger in the solar thermal heating system is less than a third temperature threshold, and the temperature of the working fluid in the heat storage device is less than a fifth temperature threshold, and the fifth temperature threshold is greater than the fourth temperature threshold and less than the second temperature threshold; If so, the heating tape is started to heat the first working fluid between the first heat exchanger and the collector assembly to a fourth temperature threshold.

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