Heat supply system and control method of heat supply system

Abstract

The invention relates to a heat supply system and a control method of the heat supply system.In the heat supply system, the first surface of a photovoltaic photo-thermal plate is a photovoltaic plate, and the second surface of the photovoltaic photo-thermal plate is a photo-thermal plate; when the heat supply system starts a photovoltaic power supply heat pump mode, the photovoltaic panel outputs electric energy to the electric power storage system, and when heat is supplied to the user side equipment, the electric power storage system supplies power to the heat pump water heater, and the heat pump water heater heats a heat-conducting medium and conveys the heat-conducting medium to the user side equipment through the buffer water tank. When the heat supply system starts the photo-thermal heat collection mode, the solar water pump is started, the photo-thermal plate heats the low-temperature heat-conducting medium in the cold water pipeline through collected heat, the heated high-temperature heat-conducting medium is conveyed to the buffer water tank, and when heat is supplied to the user side equipment, the high-temperature heat-conducting medium in the buffer water tank is conveyed to the user side equipment. The photovoltaic system or the photo-thermal system is selected to collect solar energy according to actual needs, and the solar energy utilization rate is increased.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of photovoltaic and photo-thermal systems, and in particular to a heating system and a control method of the heating system. BACKGROUND

[0002] The existing photovoltaic and photo-thermal systems have significant limitations in the field of home heating. The photovoltaic system has a reduced power generation efficiency due to high temperature (single crystal silicon panel reduces 0.3% to 0.5% in efficiency per 1°C rise), and is difficult to coexist with the photo-thermal collector of the photo-thermal system due to the limitation of roof space, forcing users to choose between "photovoltaic power generation" and "photo-thermal heating", resulting in waste of resources. Although the photo-thermal system is mature in technology, the collector area is limited, and the heat loss rate can reach 15% to 20%, and the electric heating or gas auxiliary is needed at night or on cloudy days, increasing the operation cost.

[0003] The existing heat pump system (such as heat pump water heater) can improve the heating efficiency, but lacks collaborative control with the photovoltaic and photo-thermal systems, and cannot dynamically optimize energy distribution according to real-time illumination, temperature and heat load, resulting in low overall energy efficiency. SUMMARY

[0004] In order to solve the technical problem that the physical size and installation requirements of the photovoltaic panel and the photo-thermal collector conflict, forcing users to choose between photovoltaic power generation and photo-thermal heating, resulting in insufficient utilization of solar energy resources, the present application provides a heating system and a control method of the heating system.

[0005] In a first aspect, the present application provides a heating system, comprising: a photovoltaic photo-thermal panel, an electricity storage system, a heat pump water heater, a solar water pump and a buffer water tank, wherein a first surface of the photovoltaic photo-thermal panel is a photovoltaic panel, and a second surface of the photovoltaic photo-thermal panel is a photo-thermal panel; The photovoltaic panel, the electricity storage system and the heat pump water heater are electrically connected, the heat pump water heater is in communication with the buffer water tank through a first hot water pipeline and a second cold water pipeline, the photo-thermal panel is in communication with the buffer water tank through a third hot water pipeline and a third cold water pipeline, the solar water pump is arranged on the third hot water pipeline or the third cold water pipeline, and the buffer water tank is in communication with a user-side heating device through a second hot water pipeline and a second cold water pipeline. When the heat supply system starts the photovoltaic power supply heat pump mode, the photovoltaic panel outputs electric energy to the power storage system, the power storage system supplies power for the heat pump water heater when supplying heat to the user side equipment, the heat pump water heater heats the heat conducting medium, and the heat conducting medium is delivered to the user side equipment through the buffer water tank; when the heat supply system starts the light heat collection mode, the solar water pump is started, the light heat panel heats the low-temperature heat conducting medium in the cold water pipeline by using the collected heat, and the high-temperature heat conducting medium after being heated is delivered to the buffer water tank, and the high-temperature heat conducting medium in the buffer water tank is delivered to the user side equipment when supplying heat to the user side equipment.

[0006] Optionally, the back surface of the light heat panel is provided with a medium flow channel laid in a serpentine shape, an input end of the medium flow channel is in communication with the third cold water pipeline, and an output end of the medium flow channel is in communication with the third hot water pipeline.

[0007] Optionally, the heat supply system further comprises a light source tracking support. The photovoltaic light heat panel is fixed to the light source tracking support, and the light source tracking support is used for adjusting the pitch angle and the azimuth angle of the photovoltaic light heat panel according to the angle adjustment instruction.

[0008] In a second aspect, the present application provides a control method of a heat supply system, comprising: acquiring the photovoltaic panel temperature of the surface of the photovoltaic panel in the photovoltaic light heat panel and the current light intensity; determining the photovoltaic heating amount according to the photovoltaic panel temperature and the current light intensity; determining the light heat collection amount according to the current light intensity; determining the target heat supply mode of the heat supply system according to the photovoltaic heating amount and the light heat collection amount; controlling the heat supply system to operate in the target heat supply mode.

[0009] Optionally, determining the photovoltaic heating amount according to the photovoltaic panel temperature and the current light intensity comprises: acquiring the heat pump energy efficiency ratio corresponding to the ambient temperature in the power consumption period; determining the actual photovoltaic efficiency according to the photovoltaic panel temperature; determining the photovoltaic power generation power according to the actual photovoltaic efficiency and the current light intensity; calculating the energy storage battery charging power according to the photovoltaic power generation power; calculating the photovoltaic heating amount according to the energy storage battery charging efficiency and the heat pump energy efficiency ratio.

[0010] Optionally, determining the light heat collection amount according to the current light intensity comprises: determining the light heat collection power according to the current light intensity, the preset light heat efficiency and the area of the light heat panel. determine the attenuation coefficient according to the ambient temperature of the power consumption period, the water tank heat loss coefficient and the time difference between the current time and the power consumption period; determine the light-thermal heat collection amount according to the light-thermal heat collection power and the attenuation coefficient.

[0011] Optionally, determining a target heating mode of a heating system according to the photovoltaic heating amount and the light-thermal heat collection amount, comprising: determining whether the photovoltaic heating amount is greater than the light-thermal heat collection amount; if the photovoltaic heating amount is greater than the light-thermal heat collection amount, determining a photovoltaic power supply heat pump mode as the target heating mode of the heating system; if the photovoltaic heating amount is less than or equal to the light-thermal heat collection amount, determining a light-thermal heat collection mode as the target heating mode of the heating system.

[0012] Optionally, controlling the heating system to operate according to the target heating mode, comprising: if the target heating mode is the photovoltaic power supply heat pump mode, generating an angle adjustment instruction, the angle adjustment instruction being used to instruct a photovoltaic panel in a photovoltaic light-thermal panel to face the light source direction; starting an inverter rectifier device electrically connected to the photovoltaic panel, and transmitting the current output by the photovoltaic panel to an electricity storage system after inverter rectifier processing.

[0013] Optionally, controlling the heating system to operate according to the target heating mode, comprising: if the target heating mode is the light-thermal heat collection mode, generating an angle adjustment instruction, the angle adjustment instruction being used to instruct a light-thermal panel in a photovoltaic light-thermal panel to face the light source direction; starting a solar water pump, heating the low-temperature heat-conducting medium in the third cold water pipeline by the light-thermal panel using the collected heat, and conveying the high-temperature heat-conducting medium after heating to the buffer water tank through the third hot water pipeline.

[0014] Optionally, generating the angle adjustment instruction, comprising: obtaining the elevation angle and the azimuth angle of the light source; determining a target pitch angle of the photovoltaic light-thermal panel according to the elevation angle; determining a target rotation angle of the photovoltaic light-thermal panel according to the azimuth angle; generating the angle adjustment instruction according to the target pitch angle and the target rotation angle.

[0015] The above technical solutions provided by the embodiments of the present application have the following advantages compared with the prior art: The embodiment of the present application can realize the spatial coexistence of the photovoltaic panel and the photothermal panel, break the double bottleneck of the spatial coexistence and dynamic collaborative control of the photovoltaic and photothermal system, realize the full-time efficient utilization of solar energy resources, and users do not need to install between the photovoltaic system and the photothermal system; by setting the photovoltaic power supply heat pump mode and the photothermal heat collection mode, the switching of the photovoltaic system and the photothermal system can be realized, so as to select the photovoltaic system or the photothermal system to collect solar energy according to actual needs, improve the solar energy utilization rate, effectively solve the defects of resource waste and control lag, and provide an economic and efficient clean energy heating solution for users. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings incorporated into the specification and constituting a part of the specification show embodiments consistent with the present application and, together with the specification, serve to explain the principles of the present application.

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiment or prior art description will be briefly introduced as follows, and obviously, other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1 A structural diagram of a heating system provided by the embodiment of the present application; Figure 2 A schematic diagram of a back serpentine laid medium flow channel of a photothermal panel provided by the embodiment of the present application; Figure 3 A structural diagram of a light source tracking support provided by the embodiment of the present application; Figure 4 A schematic diagram of a light source tracking support tracking a light source provided by the embodiment of the present application; Figure 5 A flowchart of a control method of a heating system provided by the embodiment of the present application; Figure 6 A flowchart of a control method of a heating system in actual application provided by the embodiment of the present application. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0020] Although the existing heat pump system (such as a heat pump water heater) can improve the heating efficiency, it lacks collaborative control with a photovoltaic and photothermal system, and cannot dynamically optimize energy distribution according to real-time illumination, temperature and heat load, resulting in low overall energy efficiency. Embodiments of the present application provide a heating system and a control method thereof.

[0021] Embodiments of the present application provide a heating system, as shown in Figure 1 including a photovoltaic and photothermal panel 11, an electricity storage system 12, a heat pump water heater 13, a solar water pump 14 and a buffer water tank 15. The first surface of the photovoltaic and photothermal panel 11 is a photovoltaic panel, and the second surface of the photovoltaic and photothermal panel 11 is a photothermal panel. The photovoltaic and photothermal panel is a photovoltaic and photothermal integrated panel. The front surface of the photovoltaic and photothermal panel can be a photovoltaic panel, and the back surface can be a photothermal panel. The front surface of the photovoltaic and photothermal panel can also be a photothermal panel, and the back surface can also be a photovoltaic panel. The photovoltaic panel can be a monocrystalline silicon photovoltaic cell panel, which is used for power generation. The surface of the photothermal panel has a high-absorption coating. A metal runner plate is arranged between the photovoltaic panel and the photothermal panel. The metal runner plate is attached to the back surface of the photothermal panel to serve as a photothermal collector. A heat insulation layer is arranged between the collector and the photothermal panel to reduce heat transfer between the photovoltaic panel and the photothermal panel.

[0022] As shown in Figure 2 The back surface of the photothermal panel is provided with a medium runner 111 laid in a serpentine shape. That is, the medium runner 111 is located between the photothermal panel and the photothermal collector. The input end of the medium runner 111 is in communication with the third cold water pipeline, and the output end of the medium runner 111 is in communication with the third hot water pipeline. In this way, the low-temperature heat-conducting medium is heated after flowing through the medium runner on the back surface of the photothermal panel, and collects heat while cooling the photothermal panel. The heat-conducting medium can be water.

[0023] The heating system further includes a light source tracking support 16. The photovoltaic and photothermal panel 11 is fixed to the light source tracking support 16. The light source tracking support 16 is used to adjust the pitch angle and azimuth angle of the photovoltaic and photothermal panel 11 according to an angle adjustment instruction.

[0024] The solar tracking support adopts a double-axis adjustment structure, which includes a pitch adjustment mechanism and an azimuth adjustment mechanism. The pitch adjustment mechanism is used to control the included angle θ1 between the photovoltaic and photothermal panel 11 and the horizontal plane, and the azimuth adjustment mechanism is used to control the rotation angle θ2 of the photovoltaic and photothermal panel 11. Both the pitch adjustment mechanism and the azimuth adjustment mechanism are driven by a servo motor. According to the geographical position and local time, the angles are adjusted in real time to make the normal direction of the panel surface always align with the direction of the sun's incidence, so as to maximize the equivalent radiation area.

[0025] Specifically, as shown in Figure 3As shown, the light source tracking bracket 16 comprises: a transmission device 161, a first servo motor 162, a bracket 163, a rotatable base 164 and a second servo motor 165; The fixed shaft of the photovoltaic and photo-thermal plate 11 is in transmission connection with the first servo motor 162 through the transmission device 161, the two ends of the fixed shaft are rotatably connected with the bracket 163, the first servo motor 162 is fixed with the bracket 163, when the output shaft of the first servo motor 162 rotates, it drives the transmission device 161 to rotate, and then drives the fixed shaft of the photovoltaic and photo-thermal plate 11 to rotate, and then drives the photovoltaic and photo-thermal plate 11 to rotate, thus the pitch angle of the photovoltaic and photo-thermal plate 11 can be adjusted by the rotation of the first servo motor 162. The bracket 163 is fixed on the upper surface of the rotatable base 164, the center of the rotatable base 164 is fixedly connected with the output shaft of the second servo motor 165, when the output shaft of the second servo motor 165 rotates, it can drive the rotatable base 164 to rotate, and then drive the photovoltaic and photo-thermal plate 11 to rotate circumferentially through the bracket 163, so as to adjust the azimuth angle of the photovoltaic and photo-thermal plate 11.

[0026] Through the light source tracking bracket, the pitch angle and the azimuth angle of the photovoltaic and photo-thermal plate can be automatically adjusted according to the angle adjustment instruction, without manual adjustment, and the accuracy and efficiency of adjusting the pitch angle and the azimuth angle of the photovoltaic and photo-thermal plate are improved.

[0027] The angle adjustment instruction can be determined according to the change of the position of the sun, according to the built-in clock and the preset geographical coordinates of the system, the sun elevation angle a and the azimuth angle y of the current time are calculated, the pitch angle θ1 and the azimuth angle θ2 are calculated according to the sun elevation angle a and the azimuth angle y, and the angle adjustment instruction is generated, and then the servo motor drives the bracket to adjust the pitch angle θ1 and the azimuth angle θ2, so that the plate surface always faces the sun. Figure 4 As shown, a is the sun elevation angle, that is, the angle between the sun and the horizon; y is the sun azimuth angle, that is, the angle between the sun projection and the south. By adjusting θ1=90°-a and θ2=y, the normal direction of the plate surface is parallel to the direction of the sun incidence, so that the solar energy utilization rate is maximized. By generating the angle adjustment instruction according to the change of the position of the sun, the photovoltaic and photo-thermal plate can always face the position of the sun, so that the equivalent area of the plate surface of the photovoltaic and photo-thermal plate is maximized, and the solar energy is maximized.

[0028] The power storage system 12 comprises: a photovoltaic inverter and an energy storage battery, the photovoltaic inverter is used for inverting and rectifying the current output by the photovoltaic plate, the energy storage battery is used for storing the electrical energy after the inverting and rectifying, and providing electrical energy support when the user-side equipment is heated and the heat pump water heater is operated. Exemplarily, the user-side equipment can be a heating equipment such as a radiator and a floor heating which can input a heat-conducting medium.

[0029] The heat pump water heater 13 is used for heating the low-temperature heat conducting medium in the second cold water pipeline of the buffer water tank 15, and then delivering the high-temperature heat conducting medium to the buffer water tank 15 through the second hot water pipeline, so that the buffer water tank 15 provides heat for the user-side equipment to meet the heating demand.

[0030] The buffer water tank 15 is a water tank with a good heat preservation layer and has a heat exchange coil inside. The buffer water tank 15 is used for storing heat energy and increasing the water capacity of the system to balance the instantaneous heat load fluctuation and prevent the heat pump from frequently starting and stopping to damage the compressor.

[0031] The solar water pump 14 is used for delivering the heat absorbed by the photothermal plate to the buffer water tank through the heat conducting medium to realize heat energy transfer.

[0032] The photovoltaic panel, the power storage system 12 and the heat pump water heater 13 are electrically connected, the heat pump water heater 13 is communicated with the buffer water tank 15 through the first hot water pipeline and the second cold water pipeline, the photothermal plate is communicated with the buffer water tank 15 through the third hot water pipeline and the third cold water pipeline, the solar water pump 14 is arranged on the third hot water pipeline or the third cold water pipeline, and the buffer water tank 15 is communicated with the user-side heating equipment through the second hot water pipeline and the second cold water pipeline. When the photovoltaic power supply heat pump mode of the heating system is started, the photovoltaic panel outputs electric energy to the power storage system 12, when the user-side equipment is heated, the power storage system 12 supplies power to the heat pump water heater 13, the heat pump water heater 13 heats the heat conducting medium, and the heat conducting medium is delivered to the user-side equipment through the buffer water tank 15; when the photothermal heat collection mode of the heating system is started, the solar water pump 14 is started, the photothermal plate heats the low-temperature heat conducting medium in the cold water pipeline by using the collected heat, and the high-temperature heat conducting medium after being heated is delivered to the buffer water tank 15, and when the user-side equipment is heated, the high-temperature heat conducting medium in the buffer water tank 15 is delivered to the user-side equipment.

[0033] The embodiment of the present application can realize the spatial coexistence of the photovoltaic panel and the photothermal plate by arranging the photovoltaic panel on the first surface of the photovoltaic photothermal plate and arranging the photothermal plate on the second surface of the photovoltaic photothermal plate, break through the double bottlenecks of the spatial coexistence and dynamic collaborative control of the photovoltaic system and the photothermal system, realize the full-time efficient utilization of solar energy resources, and enable the user to not need to install the photovoltaic system or the photothermal system; the photovoltaic power supply heat pump mode and the photothermal heat collection mode are arranged, the switching of the photovoltaic system and the photothermal system can be realized, so that the photovoltaic system or the photothermal system can be selected according to the actual needs to collect solar energy, the solar energy utilization rate is improved, the defects of resource waste and control lag are effectively solved, and an economic and efficient clean energy heating solution is provided for the user.

[0034] In the prior art, the equivalent heating capacity of photovoltaic power supply heat pump and photothermal heat collection cannot be scientifically quantified and compared, and there is a lack of dynamic decision mechanism based on illumination intensity, environmental temperature and heat load attenuation characteristics, resulting in low efficiency of energy distribution and low efficiency of the whole system. Therefore, in another embodiment of the present application, a control method of a heating system is also provided, which can be applied to a controller of the heating system, as shown in Figure 5 The control method can include the following steps: Step S101, obtaining the photovoltaic panel temperature of the photovoltaic panel surface in the photovoltaic-photothermal panel and the current illumination intensity; In the embodiment of the present application, the photovoltaic panel temperature can refer to the real-time temperature of the photovoltaic panel, that is, the temperature at the current time, which can be detected by the temperature sensor arranged on the surface of the photovoltaic panel. The current illumination intensity can refer to the illumination intensity of the photovoltaic panel surface at the current time, that is, the solar radiation intensity, which can be detected by the light intensity sensor arranged on the surface of the photovoltaic panel.

[0035] In this step, the photovoltaic panel temperature output by the temperature sensor and the current illumination intensity output by the light intensity sensor can be obtained.

[0036] Step S102, determining the photovoltaic heating amount according to the photovoltaic panel temperature and the current illumination intensity; In this step, the specific value of the conversion of solar energy into heat energy by the photovoltaic panel under the working condition can be calculated according to the collected photovoltaic panel temperature and current illumination intensity.

[0037] Specifically, the photovoltaic panel temperature and the current illumination intensity can be brought into the preset photovoltaic heating amount calculation formula group to obtain the photovoltaic heating amount, which is used to indicate the equivalent heating capacity of the photovoltaic panel.

[0038] Step S103, determining the photothermal heat collection amount according to the current illumination intensity; In this step, the total amount of solar energy absorbed and converted into heat energy by the photothermal panel can be calculated in combination with the real-time collected current illumination intensity.

[0039] The current illumination intensity can be brought into the preset photothermal heat collection amount calculation formula group to obtain the photothermal heat collection amount, which is used to indicate the equivalent heating capacity of the photothermal panel.

[0040] Step S104, determining the target heating mode of the heating system according to the photovoltaic heating amount and the photothermal heat collection amount; In this step, the size relationship between the photovoltaic heating amount and the photothermal heat collection amount can be compared, and the heating operation mode meeting the actual demand can be selected.

[0041] Specifically, the photovoltaic heating amount and the light-heat heat collection amount can be compared, and the heating mode corresponding to the larger one is selected as the target heating mode to be switched, and the target heating mode is one of the photovoltaic power supply heat pump mode and the light-heat heat collection mode.

[0042] In step S105, the heating system is controlled to operate according to the target heating mode.

[0043] In this step, according to the determined target heating mode, control instructions can be sent to the actuators of the heating system (such as one or more of the light source tracking support 16, the power storage system 12, the heat pump water heater 13, the solar water pump 14, and the buffer water tank 15), and the system operating parameters are adjusted to enable the corresponding components of the heating system to operate stably according to the target heating mode.

[0044] In actual application, the controller can periodically execute steps S101 to S105 at preset time intervals (such as every 15 minutes), determine the target heating mode in the previous preset time interval, and control the heating system to heat the user-side equipment according to the target heating mode in the next preset time interval.

[0045] The embodiments of the present application convert the electric energy converted by the photovoltaic panel into photovoltaic heating amount, convert the heat energy converted by the light-heat panel into light-heat heat collection amount, and then determine the target heating mode according to the photovoltaic heating amount and the light-heat heat collection amount in the photovoltaic panel and the heat collection panel, that is, the electric energy and the heat energy are converted into equivalent heating amount, the mode with higher equivalent heating amount is determined as the target heating mode, and the heating system is controlled to operate according to the target heating mode, the overall energy efficiency of the system is significantly improved, the solar energy utilization rate is greatly improved, the defects of resource waste and control lag are effectively solved, and an economic and efficient clean energy heating solution is provided for users.

[0046] In another embodiment of the present application, step S102 determines the photovoltaic heating amount according to the photovoltaic panel temperature and the current light intensity, comprising: In step S201, the heating pump energy efficiency ratio corresponding to the environment temperature in the electricity consumption period is obtained. In the embodiments of the present application, the electricity consumption period can be a heating peak period, or an arbitrary period specified by the user, or a default period, etc., which can be set according to actual needs, and the present application does not make any limitation.

[0047] In this step, the actual temperature of the environment in the set electricity consumption period can be collected, and then the heating pump energy efficiency ratio corresponding to the environment temperature can be determined through a preset corresponding relationship.

[0048] Specifically, the heating pump energy efficiency ratio COP corresponding to the environment temperature T env-future The corresponding heating pump energy efficiency ratio COP is obtained from the ambient temperature and water temperature database.

[0049] Exemplarily, the ambient temperature during the power consumption period (e.g., 14:00-16:00) is 28℃, and the corresponding heat pump energy efficiency ratio is determined to be 3.5 through the preset corresponding relationship.

[0050] In step S202, the actual photovoltaic efficiency is determined according to the photovoltaic panel temperature. In this step, the real-time surface temperature of the photovoltaic panel can be obtained, and the actual power generation efficiency of the photovoltaic panel at the photovoltaic panel temperature can be obtained according to the characteristic curve or calculation formula of the photovoltaic panel efficiency changing with temperature. In an embodiment of the present application, the difference between the photovoltaic panel temperature and the preset reference temperature can be calculated to obtain a temperature change amount; the product of the preset temperature coefficient and the temperature change amount can be calculated to obtain a corrected temperature change amount; the difference between 1 and the corrected temperature change amount can be calculated to obtain a photovoltaic efficiency change amount; and the product of the photovoltaic efficiency change amount and the preset reference photovoltaic efficiency can be calculated to obtain the actual photovoltaic efficiency.

[0051] Exemplarily, the actual photovoltaic efficiency can be calculated by the following formula: η pv (T pv )=η pv0 ×[1 β×(T pv T ref )] Wherein, T pv is the photovoltaic panel temperature, η pv0 is the preset reference photovoltaic efficiency, β is the temperature coefficient, and Tref is the preset reference temperature.

[0052] In an embodiment of the present application, the photovoltaic panel temperature can be obtained, and the actual photovoltaic efficiency corresponding thereto can be obtained in the photovoltaic panel temperature-efficiency characteristic curve.

[0053] Exemplarily, if the photovoltaic panel temperature is 50℃, the actual photovoltaic efficiency is obtained to be 18% according to the photovoltaic panel temperature-efficiency characteristic curve.

[0054] In step S203, the photovoltaic power generation power is determined according to the actual photovoltaic efficiency and the current light intensity. In this step, the actual photovoltaic efficiency and the current light intensity data obtained can be combined, and the photovoltaic panel current power generation power can be calculated through the power calculation formula.

[0055] Specifically, the area of the photovoltaic panel can be obtained; and the product of the actual photovoltaic efficiency, the current light intensity and the area of the photovoltaic panel is determined as the photovoltaic power generation power.

[0056] Specifically, the photovoltaic power generation power can be calculated by the following formula: P pv =η pv (T pv )×G×A pv Wherein, G is the real-time light intensity, A pv is the photovoltaic panel area.

[0057] For example, if the current light intensity is 900 W / m2, the photovoltaic panel area is 20 m2, and the actual photovoltaic efficiency is 18%, the photovoltaic power generation power is calculated by the formula to be 900*20*18%=3240 W.

[0058] Step S204, calculating the energy storage battery charging power according to the photovoltaic power generation power; In this step, the energy storage battery charging power can be obtained according to the preset correlation calculation rule of photovoltaic power generation power and energy storage battery charging power, on the basis of considering line loss, charging controller conversion efficiency and other factors.

[0059] Specifically, the product of the photovoltaic power generation power and the preset inverter efficiency and the preset battery charging efficiency can be determined as the energy storage battery charging power.

[0060] Specifically, the energy storage battery charging power can be calculated by the following formula: P batt =P pv ×η inv ×η batt Wherein, η inv is the inverter efficiency, and η batt is the battery charging efficiency.

[0061] Step S205, calculating the photovoltaic heating capacity according to the energy storage battery charging efficiency and the heat pump energy efficiency ratio.

[0062] In this step, the product of the heat pump energy efficiency ratio and the energy storage battery charging efficiency can be determined as the photovoltaic heating capacity.

[0063] Specifically, the photovoltaic heating capacity can be calculated by the following formula: P epv =P batt ×COP Wherein, COP is the heat pump energy efficiency ratio.

[0064] The application embodiment can calculate the photovoltaic heating amount according to the photovoltaic panel temperature and the current light intensity, convert the electric energy converted by the photovoltaic panel into equivalent heating amount, and then determine the mode with higher equivalent heating amount as the target heating mode, dynamically calculate various parameters according to the actual environmental conditions and equipment characteristics, ensure the accuracy of the photovoltaic heating amount calculation result, and provide a reliable basis for subsequent heat scheduling and operation control of the system. Meanwhile, the photovoltaic energy utilization efficiency is improved, and energy waste is reduced by effectively combining the energy storage battery charging efficiency and the heat pump energy efficiency ratio.

[0065] In another embodiment of the application, step S103 determines the light-heat heat collection amount according to the current light intensity, comprising: Step S301, determining the light-heat heat collection power according to the current light intensity, the preset light-heat efficiency and the light-heat panel area; In this step, the current light intensity can be obtained first, the preset light-heat efficiency of the light-heat panel and the actual heat collection area of the light-heat panel in the system are retrieved, and then the light-heat heat collection power of the light-heat panel is calculated through the light-heat heat collection power calculation formula.

[0066] Specifically, the light-heat heat collection power can be calculated by the following formula: P st =η st ×G×A st Wherein, η st is the light-heat efficiency, A st is the light-heat panel area, and G is the real-time light intensity.

[0067] For example, if the current light intensity collected is 850W / ㎡, the system preset light-heat efficiency is 80%, and the light-heat panel area is 15㎡, the light-heat heat collection power = 50×80%×15 = 10200W is obtained through the calculation formula.

[0068] Step S302, determining the attenuation coefficient according to the ambient temperature of the electricity consumption period, the water tank heat loss coefficient and the time difference between the current time and the electricity consumption period; In this step, the ambient temperature of the electricity consumption period can be collected, the water tank heat loss coefficient of the water tank itself can be obtained, and the time difference between the current time and the set electricity consumption period can be calculated. Then, the attenuation coefficient of the heat in the transmission and storage process due to the time lapse, the ambient temperature and the water tank characteristics is determined according to the correlation model or calculation rule of the three parameters and the attenuation coefficient. Specifically, the attenuation coefficient can be calculated by the following formula: ε=g(T env-future ,Δt) Wherein, g is the heat loss function, and the typical form is ε=e k·Δt, k is the water tank heat loss coefficient, At is the time difference from the current time to the peak period, T env-future is the ambient temperature of the power consumption period.

[0069] For example, it is known that the ambient temperature of the power consumption period is 25℃, the water tank heat loss coefficient is 0.02 W / (℃ h), the time difference between the current time and the power consumption period is 2h, and the decay coefficient is determined to be 0.92 according to the correlation calculation rule.

[0070] Step S303, determining the light-heat heat collection amount according to the light-heat heat collection power and the decay coefficient.

[0071] In this step, the light-heat heat collection power calculated in step S301 can be multiplied by the decay coefficient determined in step S302, and finally the actual light-heat heat collection amount that can be provided by the light-heat system is calculated.

[0072] Specifically, the equivalent heat collection capacity can be calculated by the following formula: P est =P st ×ε The embodiment of the application can calculate the light-heat heat collection amount according to the current light intensity, convert the heat energy of the light-heat plate into equivalent heating capacity, and then determine the mode with higher equivalent heating capacity as the target heating mode. The light-heat heat collection power is accurately calculated by combining the current light intensity, the preset light-heat efficiency and other parameters, ensuring the accuracy of the initial heat collection capacity calculation of the light-heat system. The decay coefficient is determined by comprehensively considering the ambient temperature of the power consumption period, the water tank heat loss coefficient and the time difference, fully considering the loss factors in the heat transfer and storage process, and making the decay coefficient more in line with the actual situation. Finally, the light-heat heat collection amount is determined according to the light-heat heat collection power and the decay coefficient, which improves the reliability of the light-heat heat collection amount calculation result and provides accurate data support for the heat scheduling and selection of the target heating mode of the light-heat system.

[0073] In another embodiment of the application, step S104 determines the target heating mode of the heating system according to the photovoltaic heating capacity and the light-heat heat collection amount, comprising: Step S401, determining whether the photovoltaic heating capacity is greater than the light-heat heat collection amount; In this step, the photovoltaic heating capacity value and the light-heat heat collection amount value calculated in the foregoing embodiments can be obtained, and then the two values are compared in size to determine the size relationship between the two values.

[0074] Step S402, if the photovoltaic heating capacity is greater than the light-heat heat collection amount, the photovoltaic power supply heat pump mode is determined as the target heating mode of the heating system; When the comparison result of step S401 is that the photovoltaic heating amount is higher than the thermal collection amount, according to the preset mode selection rule of the system, the photovoltaic heating pump mode driven by the photovoltaic power supply is set as the target heating mode of the heating system in the next preset time interval.

[0075] In step S403, if the photovoltaic heating amount is less than or equal to the thermal collection amount, the thermal collection mode is determined as the target heating mode of the heating system.

[0076] When the comparison result of step S401 is that the photovoltaic heating amount is lower than the thermal collection amount, according to the preset mode selection rule of the system, the thermal collection mode of the thermal collection device is determined as the target heating mode of the heating system in the next preset time interval.

[0077] In the embodiment, if P epv >P est , the photovoltaic heating pump mode is determined as the target heating mode of the heating system, otherwise, the thermal collection mode is determined as the target heating mode of the heating system.

[0078] For example, when the photovoltaic and thermal combined heating system is running, the photovoltaic heating amount is 4500W and the thermal collection amount is 3800W. The photovoltaic heating amount is compared with the thermal collection amount, and the result is that the photovoltaic heating amount is greater than the thermal collection amount. Based on the result, the photovoltaic heating pump mode is determined as the target heating mode of the heating system according to the system rule, and then the photovoltaic power supply module is started to drive the heat pump to run to meet the heating demand. If another running scenario is that the photovoltaic heating amount is 3200W and the thermal collection amount is 3500W, the comparison result is that the photovoltaic heating amount is less than the thermal collection amount, and the thermal collection mode is determined as the target heating mode, and the system is switched to the heating operation state dominated by the thermal collection device.

[0079] In the embodiment, the photovoltaic heating amount is compared with the thermal collection amount, the mode with the highest equivalent heating amount is determined as the target heating mode, the target heating mode is selected by directly comparing the numerical relationship between the photovoltaic heating amount and the thermal collection amount, without complex multi-parameter calculation, the mode selection process is simplified, and the response speed of the heating system is improved. According to the actual numerical value of the two kinds of heat, the target heating mode is selected, which can ensure that the heating system always works in the mode with the highest equivalent heating amount, improves the utilization efficiency of solar energy, and at the same time, the clear mode switching rule can avoid the randomness of the heating mode selection, ensures the stability of the heating system operation, ensures that the system can meet the heating demand in a more efficient way under different heat supply conditions, and considers the economy and reliability of the system operation.

[0080] In yet another embodiment of the present application, step S105 controls the heating system to operate according to the target heating mode, including: Step S501, if the target heating mode is the photovoltaic heating pump mode, an angle adjustment instruction is generated, which is used to instruct the photovoltaic panel in the photovoltaic-thermal panel to face the light source direction; When the heating system determines that the target heating mode is the photovoltaic heating pump mode relying on photovoltaic power supply to drive the heat pump to operate, the system automatically generates an angle adjustment instruction for adjusting the angle of the photovoltaic panel in the photovoltaic-thermal panel assembly. The instruction is used to control the angle or orientation of the photovoltaic panel so that it can be more accurately aligned with the light source (usually the sun) to improve the light absorption efficiency of the photovoltaic panel.

[0081] Step S502, start the inverter rectifier device electrically connected to the photovoltaic panel, and transmit the current output by the photovoltaic panel after inverter rectification to the power storage system.

[0082] After the angle adjustment of the photovoltaic panel is completed, the system starts the inverter rectifier device connected to the photovoltaic panel through the circuit. The device first rectifies and stabilizes the direct current generated by the photovoltaic panel, then converts the processed power into a current that meets the input requirements of the power storage system, and finally transmits the processed current to the power storage system for storage.

[0083] For example, in the operation of a certain photovoltaic-thermal combined heating system, the target heating mode is determined to be the photovoltaic heating pump mode through preliminary judgment, at this time step S501 is entered, the system generates an angle adjustment instruction according to the real-time direction of the current light source (sun), the instruction controls the photovoltaic panel in the photovoltaic-thermal panel to adjust from the initial 30° inclination angle to 45° inclination angle, so that the front of the photovoltaic panel faces the direction of the sun; After completing the angle adjustment, step S502 is entered, the system starts the inverter rectifier device electrically connected to the photovoltaic panel, the photovoltaic panel outputs a direct current voltage of 36V at this time, the inverter rectifier device first rectifies the direct current to a stable 48V direct current, and then inverts it to 220V alternating current, and then transmits the processed 220V alternating current to the power storage system of the system. After receiving the current, the power storage system starts to store the power to provide power support for the subsequent operation of the heat pump.

[0084] The embodiment of the present application can start the inverter rectification for battery energy storage after determining that the photovoltaic power supply heat pump mode is a target heating mode with higher equivalent heating capacity, for use in the period when the user needs heating. The embodiment of the present application can generate an angle adjustment instruction to make the photovoltaic panel face the light source direction when determining that the target heating mode is the photovoltaic power supply heat pump mode, which can significantly improve the light absorption amount of the photovoltaic panel, and further improve the power generation efficiency of the photovoltaic panel, thereby providing more sufficient power for the heat pump operation. The embodiment of the present application can process the output current of the photovoltaic panel through the start-up of the inverter rectification device and deliver it to the energy storage system, which can ensure that the current output by the photovoltaic panel meets the input requirements of the energy storage system, avoid equipment damage or power waste caused by mismatched current parameters, and at the same time realize the effective storage of electric energy, thereby ensuring the stability and continuity of the heating system in the photovoltaic power supply mode, and further improving the energy utilization efficiency and operation reliability of the entire system.

[0085] In another embodiment of the present application, step S105 controls the heating system to work according to the target heating mode, including: Step S601, if the target heating mode is a light-heat collection mode, an angle adjustment instruction is generated, and the angle adjustment instruction is used to indicate the light-heat panel in the photovoltaic light-heat panel to face the light source direction. When the heating system determines that the target heating mode is a light-heat collection mode that relies on the light-heat panel to collect heat, the system automatically generates an angle adjustment instruction for adjusting the position of the light-heat panel in the photovoltaic light-heat panel assembly. The function of the instruction is to control the angle or direction of the light-heat panel, so as to accurately align the light-heat panel with the light source (usually the sun), so as to maximize the light absorption efficiency of the light-heat panel and increase the heat collection amount.

[0086] Step S602, start the solar water pump, use the collected heat of the light-heat panel to heat the low-temperature heat-conducting medium in the third cold water pipeline, and deliver the high-temperature heat-conducting medium after heating to the buffer water tank through the third hot water pipeline.

[0087] After the angle adjustment of the light-heat panel is completed, the system starts the matching solar water pump. The low-temperature heat-conducting medium (such as water) in the cold water pipeline flows through the light-heat panel under the driving of the water pump. The light-heat panel transmits the heat collected from the light energy to the heat-conducting medium to increase the temperature of the heat-conducting medium. Then, the solar water pump delivers the heat-conducting medium with increased temperature after heating to the buffer water tank, thereby completing the transfer and storage of heat.

[0088] For example, a certain photovoltaic and photo-thermal combined heating system determines through preliminary judgment that the target heating mode is a photo-thermal heat collection mode, at which time step S601 is entered, the system generates an angle adjustment instruction according to the real-time orientation of the current sun (for example, at noon, the sun is located in the south direction), the instruction controls the photo-thermal panel in the photovoltaic and photo-thermal panel to adjust from an initial 25° inclination angle to a 35° inclination angle, so that the light-receiving surface of the photo-thermal panel is completely directed towards the sun direction; after the angle adjustment is completed, step S602 is entered, the system starts the solar water pump, and the heat-conducting medium with an initial temperature of 15℃ in the cold water pipeline flows into the photo-thermal panel under the action of the water pump, the photo-thermal panel absorbs solar energy and transfers the heat to the heat-conducting medium, so that the temperature of the heat-conducting medium is increased to 55℃, and then the solar water pump transports the heat-conducting medium with a high temperature of 55℃ to the buffer water tank, and the buffer water tank receives the heat-conducting medium with a high temperature, and stores the heat through the internal heat exchange structure, so as to prepare for subsequent user-side heating.

[0089] After determining that the photo-thermal heat collection mode is the target heating mode with higher equivalent heating capacity, the photovoltaic power supply is turned off, and the solar water pump is started to transport the heat to the buffer water tank for use during the period when the user needs heating. In the embodiment, when the target heating mode is the photo-thermal heat collection mode, the photo-thermal panel is directed towards the light source direction by generating an angle adjustment instruction, which can effectively improve the absorption efficiency of the photo-thermal panel to solar energy, increase the heat collection amount per unit time, and provide sufficient heat source for subsequent heating. By starting the solar water pump to drive the circulation of the heat-conducting medium, efficient transfer and storage of the heat collected by the photo-thermal panel to the buffer water tank are realized, heat accumulation at the photo-thermal panel is avoided, and waste of heat is avoided. At the same time, the heat storage function of the buffer water tank can balance the fluctuation of heating demand and ensure the stability of user-side heating. The whole process makes full use of solar energy resources, reduces the dependence on traditional energy, reduces system operation energy consumption and carbon emissions, and takes into account economy and environmental protection, and is suitable for various photo-thermal heating scenarios.

[0090] The traditional system lacks real-time sun tracking capability and cannot dynamically adjust the panel angle according to the sun elevation angle and azimuth angle, resulting in a decrease in the equivalent heat collection or power generation area over time. In another embodiment of the present application, the angle adjustment instruction generated in step S501 or step S601 includes: Step S701, obtaining the elevation angle and azimuth angle of the light source; In this step, the elevation angle (i.e. the angle between the light source and the horizon) and the azimuth angle (i.e. the angle of the light source relative to the south direction in the horizontal plane) of the light source (usually the sun) relative to the ground at the current time can be obtained by a light sensor or an astronomical algorithm, obtaining two key angle parameters for determining the direction of the photovoltaic and photo-thermal panel.

[0091] In the embodiment of the present application, the current sun elevation angle a and azimuth angle y can be calculated according to the built-in clock and the system preset geographical coordinates (latitude and longitude).

[0092] Step S702, determining a target pitch angle of the photovoltaic and photo-thermal panel according to the elevation angle; In this step, the obtained elevation angle can be converted into a target pitch angle of the photovoltaic and photo-thermal panel to be adjusted (i.e. the angle of the photovoltaic and photo-thermal panel rotating up and down around the horizontal axis) according to the adaptive relationship between the elevation angle of the light source and the pitch angle of the photovoltaic and photo-thermal panel (e.g. the smaller the elevation angle, the larger the pitch angle needs to be to ensure the light-receiving area of the photovoltaic and photo-thermal panel) through a pre-designed calculation model or a lookup table.

[0093] Step S703, determining a target rotation angle of the photovoltaic and photo-thermal panel according to the azimuth angle; In this step, the obtained azimuth angle can be converted into a target rotation angle of the photovoltaic and photo-thermal panel to be adjusted (i.e. the angle of the photovoltaic and photo-thermal panel rotating left and right around the vertical axis) according to the corresponding rule between the azimuth angle of the light source and the rotation angle of the photovoltaic and photo-thermal panel (e.g. the azimuth angle is eastward, the rotation angle needs to be adjusted eastward to align with the light source) combined with the azimuth compensation parameter preset by the system.

[0094] Step S704, generating the angle adjustment instruction according to the target pitch angle and the target rotation angle.

[0095] In this step, the target pitch angle determined in step S702 and the target rotation angle determined in step S703 can be integrated into a control instruction containing specific angle parameters, which is used to instruct the solar tracking support to complete the angle adjustment.

[0096] The angle of the photovoltaic and photo-thermal panel is adjusted in real time by the solar tracking support according to the solar elevation angle and the azimuth angle, so that the normal line of the panel surface is aligned with the incident direction of the sun. The target pitch angle θ1=90° α, the target rotation angle θ2=γ, which can ensure that the equivalent heat-collecting / generating area is maximized.

[0097] For example, when a certain photovoltaic and photo-thermal combined heating system is running, it enters step S701, and the light monitoring module collects the current elevation angle of the light source (the sun) as 40° and the azimuth angle as 15° eastward; it enters step S702, and according to the system preset elevation angle-pitch angle lookup table, the target pitch angle corresponding to the 40° elevation angle is 50°, so the target pitch angle of the photovoltaic and photo-thermal panel is determined as 50°; it enters step S703, and according to the azimuth angle-rotation angle conversion rule, the 15° eastward azimuth angle needs to correspond to a 15° eastward rotation to align with the light source, so the target rotation angle of the photovoltaic and photo-thermal panel is determined as 15° eastward; it enters step S704, and the system integrates the target pitch angle 50° and the target rotation angle 15° eastward to generate an angle adjustment instruction containing the pitch angle 50° and the rotation angle 15° eastward parameters, which is then sent to the solar tracking support.

[0098] The embodiment provides accurate basic data for photovoltaic and photo-thermal plate angle adjustment by accurately obtaining the altitude angle and azimuth angle of the light source, avoids angle adjustment failure caused by light source position judgment deviation, realizes fine adjustment of the photovoltaic and photo-thermal plate angle by respectively determining the target pitch angle and the target rotation angle according to the altitude angle and the azimuth angle, ensures that the photo-thermal plate always aligns with the light source at the optimal angle, maximizes the light energy absorption efficiency, and directly guides the solar tracking support to perform adjustment operation based on the angle adjustment instructions generated based on the two target angles, simplifies the adjustment process, reduces the adjustment time, and improves the overall operation efficiency of the photovoltaic and photo-thermal system, thereby providing better light conditions for subsequent heat collection or power generation.

[0099] In summary, as shown in Figure 6 At each time interval, the photovoltaic panel temperature Tpv is detected first, the current power generation Ppv is calculated according to the current solar radiation intensity G, and the energy storage power Pbatt is calculated in combination with the energy storage battery charging efficiency; at the same time, the system extracts the corresponding heat pump energy efficiency ratio COP from the ambient temperature and water temperature database according to the predicted environment temperature Tenv-future of the heating peak period, and finally determines the equivalent heating capacity Pepv. In the photo-thermal mode, the system calculates the photo-thermal collector heat power Pst, combines the time decay to determine the heat storage decay coefficient ε, and obtains the equivalent photo-thermal collector capacity Pest at the heating peak period. When Pepv>Pest, the system switches to the photovoltaic power supply heat pump mode, starts the inverter rectifier device to store energy for the battery, and drives the heat pump water heater to generate heat; otherwise, the system switches to the photo-thermal collector mode, closes the photovoltaic power supply, and starts the solar water pump to deliver the heat collection heat to the buffer water tank for heat storage.

[0100] It should be noted that, in this document, relational terms such as“first” and“second”, and the like, are used solely to distinguish one entity or action from another entity or action, without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms“comprises”,“comprising”, or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by“comprises a...” does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0101] The foregoing is considered as illustrative only of the principles of the application. Numerous modifications and changes will readily occur to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Therefore, the scope of the application is indicated by the appended claims rather than by the foregoing description, and all changes that come within the meaning and range of equivalents are intended to be embraced therein.

Claims

1. A heating system, characterized in that The application relates to a photovoltaic-thermal panel, an electricity storage system, a heat pump water heater, a solar water pump and a buffer water tank. The photovoltaic panel, the electricity storage system and the heat pump water heater are electrically connected, the heat pump water heater is communicated with the buffer water tank through a first hot water pipeline and a second cold water pipeline, the photothermal panel is communicated with the buffer water tank through a third hot water pipeline and a third cold water pipeline, the solar water pump is arranged on the third hot water pipeline or the third cold water pipeline, and the buffer water tank is communicated with user-side heating equipment through a second hot water pipeline and a second cold water pipeline. When the heating system starts a photovoltaic power supply heat pump mode, the photovoltaic panel outputs electric energy to the electricity storage system; when the heating system starts a photothermal heat collection mode, the solar water pump is started, the photothermal panel heats low-temperature heat conducting medium in the cold water pipeline by collecting heat, and the high-temperature heat conducting medium after being heated is delivered to the buffer water tank. The back surface of the photothermal panel is provided with a medium flow channel laid in a serpentine shape, the input end of the medium flow channel is communicated with the third cold water pipeline, and the output end of the medium flow channel is communicated with the third hot water pipeline.

2. The heating system according to claim 1, characterized in that The application further relates to a light source tracking support.

3. The heating system according to claim 1, characterized in that The photovoltaic-thermal panel is fixed to the light source tracking support, and the light source tracking support is used for adjusting the pitch angle and the azimuth angle of the photovoltaic-thermal panel according to an angle adjusting instruction. The application relates to a photovoltaic-thermal panel, an electricity storage system, a heat pump water heater, a solar water pump and a buffer water tank. The photovoltaic panel, the electricity storage system and the heat pump water heater are electrically connected, the heat pump water heater is communicated with the buffer water tank through a first hot water pipeline and a second cold water pipeline, the photothermal panel is communicated with the buffer water tank through a third hot water pipeline and a third cold water pipeline, the solar water pump is arranged on the third hot water pipeline or the third cold water pipeline, and the buffer water tank is communicated with user-side heating equipment through a second hot water pipeline and a second cold water pipeline.

4. A control method of a heating system, characterized by, When the heating system starts a photovoltaic power supply heat pump mode, the photovoltaic panel outputs electric energy to the electricity storage system; when the heating system starts a photothermal heat collection mode, the solar water pump is started, the photothermal panel heats low-temperature heat conducting medium in the cold water pipeline by collecting heat, and the high-temperature heat conducting medium after being heated is delivered to the buffer water tank. The back surface of the photothermal panel is provided with a medium flow channel laid in a serpentine shape, the input end of the medium flow channel is communicated with the third cold water pipeline, and the output end of the medium flow channel is communicated with the third hot water pipeline. The application further relates to a light source tracking support. The photovoltaic-thermal panel is fixed to the light source tracking support, and the light source tracking support is used for adjusting the pitch angle and the azimuth angle of the photovoltaic-thermal panel according to an angle adjusting instruction. The application relates to a photovoltaic-thermal panel, an electricity storage system, a heat pump water heater, a solar water pump and a buffer water tank. The photovoltaic panel, the electricity storage system and the heat pump water heater are electrically connected, the heat pump water heater is communicated with the buffer water tank through a first hot water pipeline and a second cold water pipeline, the photothermal panel is communicated with the buffer water tank through a third hot water pipeline and a third cold water pipeline, the solar water pump is arranged on the third hot water pipeline or the third cold water pipeline, and the buffer water tank is communicated with user-side heating equipment through a second hot water pipeline and a second cold water pipeline.

5. The control method of a heating system according to claim 4, characterized by, When the heating system starts a photovoltaic power supply heat pump mode, the photovoltaic panel outputs electric energy to the electricity storage system; when the heating system starts a photothermal heat collection mode, the solar water pump is started, the photothermal panel heats low-temperature heat conducting medium in the cold water pipeline by collecting heat, and the high-temperature heat conducting medium after being heated is delivered to the buffer water tank. The back surface of the photothermal panel is provided with a medium flow channel laid in a serpentine shape, the input end of the medium flow channel is communicated with the third cold water pipeline, and the output end of the medium flow channel is communicated with the third hot water pipeline. The application further relates to a light source tracking support. The photovoltaic-thermal panel is fixed to the light source tracking support, and the light source tracking support is used for adjusting the pitch angle and the azimuth angle of the photovoltaic-thermal panel according to an angle adjusting instruction. The application relates to a photovoltaic-thermal panel, an electricity storage system, a heat pump water heater, a solar water pump and a buffer water tank. The photovoltaic panel, the electricity storage system and the heat pump water heater are electrically connected, the heat pump water heater is communicated with the buffer water tank through a first hot water pipeline and a second cold water pipeline, the photothermal panel is communicated with the buffer water tank through a third hot water pipeline and a third cold water pipeline, the solar water pump is arranged on the third hot water pipeline or the third cold water pipeline, and the buffer water tank is communicated with user-side heating equipment through a second hot water pipeline and a second cold water pipeline.

6. The control method of a heating system according to claim 4, characterized by, When the heating system starts a photovoltaic power supply heat pump mode, the photovoltaic panel outputs electric energy to the electricity storage system; when the heating system starts a photothermal heat collection mode, the solar water pump is started, the photothermal panel heats low-temperature heat conducting medium in the cold water pipeline by collecting heat, and the high-temperature heat conducting medium after being heated is delivered to the buffer water tank. The back surface of the photothermal panel is provided with a medium flow channel laid in a serpentine shape, the input end of the medium flow channel is communicated with the third cold water pipeline, and the output end of the medium flow channel is communicated with the third hot water pipeline. The application further relates to a light source tracking support. The photovoltaic-thermal panel is fixed to the light source tracking support, and the light source tracking support is used for adjusting the pitch angle and the azimuth angle of the photovoltaic-thermal panel according to an angle adjusting instruction.

7. The control method of a heating system according to claim 4, characterized by, ​ determining whether the photovoltaic heat generation amount is greater than the photo-thermal heat collection amount; if the photovoltaic heat generation amount is greater than the photo-thermal heat collection amount, determining the photovoltaic heat pump mode as the target heat supply mode of the heat supply system; if the photovoltaic heat generation amount is less than or equal to the photo-thermal heat collection amount, determining the photo-thermal heat collection mode as the target heat supply mode of the heat supply system.

8. The control method of a heating system according to claim 4, characterized by, controlling the heat supply system to operate according to the target heat supply mode, including: if the target heat supply mode is the photovoltaic heat pump mode, generating an angle adjustment instruction, the angle adjustment instruction being used to instruct the photovoltaic panel in the photovoltaic photo-thermal panel to face the light source direction; starting the inverter rectifier device electrically connected to the photovoltaic panel to perform inverter rectification processing on the current output by the photovoltaic panel and then deliver the current to the power storage system.

9. The control method of a heating system according to claim 4, characterized by, controlling the heat supply system to operate according to the target heat supply mode, including: if the target heat supply mode is the photo-thermal heat collection mode, generating an angle adjustment instruction, the angle adjustment instruction being used to instruct the photo-thermal panel in the photovoltaic photo-thermal panel to face the light source direction; starting the solar water pump to heat the low-temperature heat-conducting medium in the third cold water pipeline using the heat collected by the photo-thermal panel and deliver the high-temperature heat-conducting medium after heating to the buffer water tank through the third hot water pipeline.

10. The control method of a heating system according to claim 8 or 9, characterized in that, generating the angle adjustment instruction, including: obtaining the elevation angle and the azimuth angle of the light source; determining the target pitch angle of the photovoltaic photo-thermal panel according to the elevation angle; determining the target rotation angle of the photovoltaic photo-thermal panel according to the azimuth angle; generating the angle adjustment instruction according to the target pitch angle and the target rotation angle.

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