Heat storage regulation and control system and method of photovoltaic heat storage type electric heating device

Abstract

The invention provides a heat storage regulation and control system and method for a photovoltaic heat storage type electric heating device, the heat storage regulation and control system comprises a heat storage assembly module and a regulation and control module, the photovoltaic heat storage type electric heating device can convert photovoltaic electric energy and power grid electric energy into heat energy to be stored, and heat is supplied to a heat using device; the regulation and control module comprises an energy cycle module, a historical data module, a prediction data module and an evaluation module; the energy period module sets a valley-light-peak period, the historical data module comprises historical energy data, and the prediction data module comprises a prediction energy module; the energy prediction module can predict energy prediction data generated in a future valley-light-peak period; the evaluation module is capable of determining whether heat of photovoltaic conversion in a future valley-light-peak period is sufficient to be supplied to the heat utilization device and whether pre-heat storage is required in a valley electricity period of the future valley-light-peak period. According to the invention, the energy utilization rate is improved, and the power consumption cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic electric heating regulation, and in particular to a thermal storage regulation system and method for a photovoltaic thermal storage type electric heating device. Background Art

[0002] Photovoltaic thermal storage electric heating device is a device that combines photovoltaic tracking and electric heat conversion. It can use the electricity of photovoltaic panels and convert it into heat energy for storage through electric heating elements. Photovoltaic thermal storage electric heating device is mainly composed of electric heating elements, heat storage medium and control system. It uses electric heating elements to convert photovoltaic panel electricity into heat energy and stores heat energy through heat storage medium (such as water, phase change material, etc.). When needed, the control system will release the heat energy stored in the heat storage medium for use by the heat-using device.

[0003] In order to maximize the use of photovoltaic energy, when photovoltaics supply power to self-use loads, the thermal storage electric heating device converts the unabsorbed photovoltaic electricity into thermal energy and stores it to provide heat for the heat-using device. This design can not only reduce the consumption of fossil fuels and carbon emissions, but also greatly reduce the cost of heat. However, due to the high dependence of photovoltaics on the environment and the change of self-use loads, the heat energy converted from photovoltaics is not stable. The thermal storage of the surplus photovoltaic electricity may not be enough to supply the heat demand of the heat-using device. Therefore, it is also necessary to consider supplementing sufficient thermal storage from the off-peak period when the electricity price is lower. For the above problems, a strategy is needed to fully convert photovoltaic electricity into heat and optimize the regulation of electrical energy. Summary of the invention

[0004] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0005] In order to solve the technical problem, the present application provides a heat storage component module and a control module;

[0006] The thermal storage component module includes photovoltaic, photovoltaic thermal storage type electric heating device and heat using device; wherein the photovoltaic thermal storage type electric heating device can convert photovoltaic electric energy and grid electric energy into thermal energy for storage, and provide heat for the heat using device;

[0007] The control module includes an energy cycle module, a historical data module, a prediction data module and an evaluation module;

[0008] The energy cycle module is provided with a valley-light-peak cycle, wherein the valley-light-peak cycle includes at least a valley power period, a peak power period and a photovoltaic operation period, wherein the valley power period is provided before the peak power period;

[0009] The historical data module includes historical energy data generated by historical valley-light-peak cycles, wherein the historical energy data includes the historical total heat demand of heat-using devices and the historical photovoltaic surplus remaining after photovoltaics supply loads;

[0010] The prediction data module includes a parameter module and a prediction energy module;

[0011] The parameter module includes the electric-heat conversion parameters of the photovoltaic thermal storage type electric heating device and the environmental parameters that cause energy changes due to changes in environmental conditions;

[0012] The predicted energy module can predict the predicted energy data generated in the future valley-light-peak cycle based on the historical energy data generated in the historical valley-light-peak cycle, the electric-heat conversion parameters and the environmental parameters; the predicted energy data includes the predicted total heat demand of the heat-using device and the predicted photovoltaic surplus remaining after the photovoltaic supply load;

[0013] The evaluation module can determine whether the heat converted from the predicted photovoltaic surplus in the future valley-light-peak cycle is sufficient to supply the heat-using device. When the judgment is no, the photovoltaic thermal storage electric heating device needs to pre-store heat during the valley electricity period of the future valley-light-peak cycle.

[0014] Preferably, the valley-light-peak cycle includes a plurality of valley electricity time periods, and the photovoltaic thermal storage type electric heating device can store heat in the plurality of valley electricity time periods respectively.

[0015] Preferably, the environmental parameters include temperature-heat demand coefficient k1 and light-photovoltaic power coefficient k2; the electric-thermal conversion parameters include photovoltaic electricity-thermal storage conversion rate η1 and grid electricity-thermal storage conversion rate η2;

[0016] Among them, k1 represents the rate of change of heat required to maintain heating demand when the unit temperature changes; k2 represents the rate of change of photovoltaic power generation when the unit light intensity changes; η1 represents the conversion rate of the photovoltaic thermal storage type electric heating device to convert photovoltaic electricity into heat; η2 represents the conversion rate of the photovoltaic thermal storage type electric heating device to convert grid electricity into heat.

[0017] Preferably, the thermal storage assembly module further includes a power detection device, which can obtain the remaining power after photovoltaic power supplies the self-use load.

[0018] The present application also provides a method for a thermal storage control system for a photovoltaic thermal storage type electric heating device as described above, comprising the following steps:

[0019] S1, setting the valley-light-peak cycle T, including the valley power period Tg, the photovoltaic working period Tu and the peak power period Tf;

[0020] S2, set the i-th valley-light-peak cycle T that has occurred i Including valley period Tg i , Photovoltaic working period Tu i and peak power period Tf i ;

[0021] Get the valley-light-peak period T i The average temperature of i And use heat device in T i The total historical heat demand EF i ;

[0022] Get the photovoltaic working period Tu i The average light intensity ω i And the historical photovoltaic surplus EG remaining after photovoltaic supplies the load i ;

[0023] Get the historical photovoltaic surplus EG i Heat gained from conversion η1EG i , where η1 is the photovoltaic electricity-heat storage conversion rate of the photovoltaic thermal storage electric heating device;

[0024] S3, set the i+1th valley-light-peak cycle T that has not occurred i+1 Including valley period Tg i+1 , Photovoltaic working period Tu i+1 and peak power period Tf i+1 ;

[0025] Get the valley-light-peak period T based on weather forecast i+1 The predicted average temperature θ i+1 and photovoltaic working period Tu i+1 The predicted light intensity ω i+1 ;

[0026] S4, according to the valley-light-peak cycle T i The total historical heat demand of the medium-use heat device EF i , get the i+1th valley-light-peak period T i+1 Forecast total heat demand EF of medium-use heat equipment i+1 = [1-k1(θ i+1 -θ i )]EF i, where k1 is the temperature-heat demand coefficient;

[0027] According to the valley-light-peak cycle T i The historical PV surplus EG i Get the valley-light-peak period T i+1 Prediction of PV surplus EG i+1 =[1+k2 (ω i+1 -ω i ) ]EG i , where k2 is the light-photovoltaic power coefficient;

[0028] Get the predicted photovoltaic surplus EG i+1 Heat that can be converted η1EG i+1 ;

[0029] S5, when η1EG i+1 ≥EF i+1 When the photovoltaic thermal storage type electric heating device converts all photovoltaic electricity and stores η1EG i+1 of calories;

[0030] When η1EG i+1 <EF i+1 When the photovoltaic thermal storage type electric heating device converts and stores η1EG through photovoltaic electricity i+1 The heat, and in the valley period Tg i+1 Obtain grid electricity for heat storage.

[0031] Among them, in step S5, when η1EG i+1 <EF i+1 When the valley-light-peak period T i+1 Valley power period Tg i+1 Obtained from the power grid (EF i+1 -η1EG i+1 ) / η2 of electricity, where η2 is the grid electricity-heat storage conversion rate.

[0032] Among them, the maximum conversion power of the photovoltaic thermal storage type electric heating device is set to Pe, and the remaining power after photovoltaic supply to the self-use load is Pu;

[0033] Set the valley-light-peak period T i+1 Valley power period Tg i+1 and photovoltaic working period Tu i+1 Have a common period TW;

[0034] When TW=0, the photovoltaic thermal storage type electric heating device is in the valley power period Tg i+1 Convert grid electricity to store heat at the maximum conversion power Pe;

[0035] When TW≠0,

[0036] During the common period, the photovoltaic thermal storage type electric heating device converts photovoltaic electricity with a power of Pu, and converts grid electricity with a power of Pe-Pu.

[0037] The beneficial effects achieved by this application are as follows:

[0038] This application uses a photovoltaic thermal storage electric heating device that combines the power grid and photovoltaics to convert excess photovoltaic electricity into thermal energy and store it for consumption. At the same time, when photovoltaic electricity is insufficient, valley electricity is used as a supplement, which can achieve the effect of storing energy when electricity prices are low and releasing heat when electricity prices are high. Through this application, all the photovoltaic electricity generated can be consumed in a timely manner, and the strategy of electricity conversion is optimized. While maximizing the use of photovoltaic electricity, it also greatly reduces the cost of heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For those skilled in the art, other drawings can also be obtained based on these drawings.

[0040] Figure 1 The photovoltaic thermal storage type electric heating device for this application is connected to the power grid and the photovoltaic state diagram. DETAILED DESCRIPTION

[0041] Below, in conjunction with the drawings in the embodiments of the present application, the technical solutions in the embodiments of the present application are clearly and completely described. 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 making creative work are within the scope of protection of the present application. It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0042] The present application provides a heat storage control system for a photovoltaic heat storage type electric heating device, comprising a heat storage component module and a control module.

[0043] Among them, the heat storage component module includes a photovoltaic connected to the power grid to supply self-use loads, a power detection device for obtaining the remaining power after the photovoltaic supplies the self-use loads, and a photovoltaic thermal storage type electric heating device connected to the photovoltaic and the power grid, and the photovoltaic thermal storage type electric heating device can convert electrical energy into thermal energy and store it. Among them, the photovoltaic thermal storage type electric heating device can convert photovoltaic electrical energy into thermal energy for storage, and can also convert power grid electrical energy into thermal energy for storage; the photovoltaic thermal storage type electric heating device is connected to the heat-using device.

[0044] The control module includes an energy cycle module, a historical data module, a prediction data module and an evaluation module;

[0045] In which, a valley-light-peak cycle T is set in the energy cycle module, and the valley-light-peak cycle includes at least one valley electricity period Tg, a peak electricity period Tf and a photovoltaic working period Tu, wherein the valley electricity period Tg is set before the peak electricity period Tf. In the specific setting, the duration of the valley-light-peak cycle can be adjusted according to specific needs, and the valley-light-peak cycle can also include multiple valley electricity periods.

[0046] The historical data module stores historical energy data generated during the historical valley-light-peak cycle; the historical energy data includes the historical total heat demand of the heat-using device during the valley-light-peak cycle and the historical photovoltaic surplus remaining after the photovoltaic supply load;

[0047] The prediction data module includes a parameter module and a prediction energy module, and the parameter module includes the electric heat conversion parameters in the thermal storage control system, and the environmental parameters that cause energy changes due to changes in environmental conditions. Specifically, in this embodiment, the environmental parameter k includes the temperature-heat demand coefficient k1 and the light-photovoltaic power coefficient k2, and the electric heat conversion parameter η includes the photovoltaic power-heat storage conversion rate η1 and the grid power-heat storage conversion rate η2; wherein k1 represents the rate of change of heat required to maintain heating demand when the unit temperature changes; k2 represents the rate of change of photovoltaic power generation when the unit light intensity changes; η1 represents the conversion rate of the photovoltaic thermal storage type electric heating device to convert photovoltaic electricity into heat; η2 represents the conversion rate of the photovoltaic thermal storage type electric heating device to convert grid power into heat.

[0048] The prediction energy module can predict the energy data required for the upcoming valley-light-peak cycle according to the historical energy data in the historical data module and the parameters in the parameter module, as the predicted energy data, wherein the predicted energy data includes the predicted total required heat of the heat-using device in the upcoming valley-light-peak cycle and the predicted photovoltaic surplus remaining after the photovoltaic supply load;

[0049] The evaluation module can determine whether the heat stored by the predicted photovoltaic surplus conversion is sufficient to supply the heat-using device in the future valley-light-peak cycle through the predicted energy data obtained by the predicted energy module. If the judgment is not positive, it is necessary to pre-store heat during the valley electricity period of the future valley-light-peak cycle.

[0050] Specifically, in one embodiment of the present application, the valley-light-peak cycle T set in the energy cycle module includes a valley power period Tg, a photovoltaic working period Tu and a peak power period Tf.

[0051] Among them, the first valley-light-peak cycle T1 that has already occurred includes the valley electricity period Tg1, the photovoltaic working period Tu1 and the peak electricity period Tf1; the average temperature θ1 of the historical period T1 and the historical total heat demand EF1 of the heat-using device in T1, as well as the average light intensity ω1 of the photovoltaic working period Tu1 and the historical photovoltaic surplus EG1 remaining after the photovoltaic supply load can be obtained, and then according to the temperature-heat demand coefficient k1, the light-photovoltaic power coefficient k2, the photovoltaic electricity-heat storage conversion rate η1 and the grid electricity-heat storage conversion rate η2, through calculation, the predicted total heat demand EF2 in the upcoming second valley-light-peak cycle T2 and the predicted photovoltaic surplus EG2 remaining after the photovoltaic supply load can be obtained, and it can be judged whether the heat converted by the predicted photovoltaic surplus EG2 is sufficient to supply the heat-using device.

[0052] Among them, k1 represents the rate of change of heat required to maintain heat demand when the unit temperature changes; k2 represents the rate of change of photovoltaic power generation when the unit light intensity changes; η1 represents the conversion rate of the photovoltaic thermal storage type electric heating device to convert photovoltaic electricity into heat; η2 represents the conversion rate of the photovoltaic thermal storage type electric heating device to convert grid electricity into heat.

[0053] For example, in system operation, the valley-light-peak cycle T is set from 22:00 on the current day to 22:00 on the next day, where the valley power period Tg is from 22:00 on the current day to 8:00 on the next day, the photovoltaic working period Tu is from 8:00 to 16:00 on the next day, and the peak power period Tf is from 8:00 to 22:00 on the next day;

[0054] Obtain the average temperature θ1 of the historical valley-light-peak cycle T1 (22:00 on September 1 to 22:00 on September 2), the total heating demand EF1 of the heat-using device in the entire T1 cycle, the average light intensity ω1 of the photovoltaic working period Tu1 (8:00-16:00 on September 2), and the historical photovoltaic surplus EG1 remaining after the photovoltaic supply load;

[0055] According to the photovoltaic electricity-heat storage conversion rate η1 of the photovoltaic heat storage type electric heating device, the heat obtained by the photovoltaic heat storage type electric heating device converting the historical photovoltaic surplus EG1 is obtained as η1EG1.

[0056] In addition, based on the historical data related to heat-using devices and photovoltaics in the system, the temperature-heat demand coefficient k1 and the light-photovoltaic power coefficient k2 can be obtained. For example, when the unit temperature is set to 1°C, every time the temperature rises / falls by 1°C, the heat required to maintain the indoor temperature at 18°C ​​decreases / increases by 5%; when the light intensity rises / falls by 1 light intensity unit, the photovoltaic power generation increases / decreases by 10%;

[0057] The energy data of the second valley-light-peak period T2 in the future is predicted based on the above data. Specifically, the second valley-light-peak period T2 is set, wherein T2 = T1 + T, and T2 is from 22:00 on September 2 to 22:00 on September 3.

[0058] Among them, the future cycle T2 includes the valley power period Tg2 (22:00 on September 2 to 8:00 on September 3), the photovoltaic working period Tu2 (8:00 to 16:00 on September 3) and the peak power period Tf2 (8:00 to 22:00 on September 3);

[0059] According to the weather forecast, the predicted average temperature θ2 of T2 and the predicted light intensity ω2 of the photovoltaic working period Tu2 are obtained;

[0060] The heat change rate k1 of the heat demand for maintaining the heat demand when the unit temperature changes is known. According to the historical total heat demand EF1 of the heat-using device in the historical period T1, the predicted total heat demand EF2 in the future period T2 is obtained = [1-k1 (θ2-θ1) ]EF1;

[0061] The photovoltaic power generation rate of change k2 when the unit light intensity changes is known, and the predicted photovoltaic surplus EG2=[1+k2 (ω2-ω1)]EG1 of the future period T2 is obtained. Then, according to the photovoltaic electricity-heat storage conversion rate η1 of the photovoltaic thermal storage electric heating device, the heat that can be converted by the predicted photovoltaic surplus EG2 is η1EG2.

[0062] When η1EG2 ≥ EF2, it means that the PV surplus obtained in the future period T2 is sufficient to supply the heating demand of the heat-using device;

[0063] When η1EG2 <EF2, it means that the photovoltaic surplus obtained in the future cycle T2 is not enough to meet the full heating demand of the heating device, and it is necessary to obtain electricity from the grid during the valley power period Tg2 in the future cycle T2 for pre-heat storage.

[0064] According to the conversion rate η2 of the photovoltaic thermal storage electric heating device to convert the power of the grid into heat, it is calculated that the power required from the grid during the valley period Tg2 of the future cycle T2 (EF i+1 -η1EG i+1 ) / η2 of electricity and then stops storing heat.

[0065] When preheat storage is required, considering that the valley power period Tg2 and the photovoltaic working period Tu2 may overlap in time, the photovoltaic thermal storage type electric heating device may need to simultaneously perform photovoltaic electricity-heat conversion and grid electricity-heat conversion during the overlapping time period. At this time, in order to ensure the maximum utilization of photovoltaic power generation, it is necessary to give priority to ensuring that all photovoltaic surplus can be converted into heat.

[0066] Specifically, the power Pu remaining after the photovoltaic power supply self-use load is obtained through the power detection device, and the maximum conversion power of the photovoltaic thermal storage type electric heating device is known to be Pe, and the valley power period Tg2 of the future cycle T2 and the photovoltaic working period Tu2 are set to have a common period TW;

[0067] During the non-common time period, the photovoltaic thermal storage type electric heating device converts grid electricity at the maximum conversion power Pe.

[0068] During the common period, the photovoltaic thermal storage type electric heating device converts photovoltaic electricity with a power of Pu and converts grid electricity with a power of Pe-Pu.

[0069] Specifically, in this embodiment, since the valley power period Tg2 (22:00 on September 2 to 8:00 on September 3) and the photovoltaic working period Tu2 (8:00 to 16:00 on September 3) do not overlap with each other in the upcoming second valley-light-peak cycle T2, and are always in non-common time periods, according to this strategy, during the valley power period Tg2 (22:00 on September 2 to 8:00 on September 3), the photovoltaic thermal storage electric heating device will convert grid electricity at the maximum conversion power Pe.

[0070] In addition, in another embodiment, in the upcoming second valley-light-peak cycle T2', the valley electricity period Tg2' is from 22:00 on September 2 to 10:00 on September 3; the photovoltaic working period Tu2' is from 8:00 to 16:00 on September 3, and the two include a common period (8:00-10:00 on September 3). Then, during the common period (8:00-10:00 on September 3), the photovoltaic thermal storage type electric heating device is arranged to convert photovoltaic electricity into heat with the power of Pu, and convert grid electricity into heat with the power of Pe-Pu, until the accumulated heat storage amount converted from grid electricity reaches (EF2-η1EG2) / η2.

[0071] During the non-common period of the valley electricity period Tg2' (22:00 on September 2 to 8:00 on September 3), the grid electricity is converted at the maximum conversion power Pe until the heat storage capacity of the photovoltaic thermal storage electric heating device reaches (EF2-η1EG2) / η2.

[0072] Furthermore, the present invention also provides a computer-readable storage medium, wherein the computer-readable storage medium includes a stored program, wherein the program executes the method described in the above method embodiment when it is run.

[0073] Furthermore, the present invention also provides an electronic device, including a memory and a processor, wherein the memory stores a computer program, and the processor is configured to execute the method described in the above method embodiment through the computer program.

[0074] Further, it should be understood that since the setting of each module is only for illustrating the functional units of the device of the present invention, the physical devices corresponding to these modules may be the processor itself, or a part of the software in the processor, a part of the hardware, or a part of the combination of software and hardware. Therefore, the number of each module in the figure is only schematic.

[0075] It is understood by those skilled in the art that all or part of the processes in the method for implementing the above-mentioned embodiments of the present invention can also be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of each of the above-mentioned method embodiments can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form, etc. The computer-readable storage medium may include: any entity or device, medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory, random access memory, electric carrier signal, telecommunication signal and software distribution medium, etc., which can carry the computer program code.

[0076] The computer device may be a terminal, and the computer device includes a processor, a memory, a communication interface, a display screen and an input device connected via a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface network of the computer device, NFC (near field communication) or other technical implementations. The display screen of the computer device may be a liquid crystal display or an electronic ink display screen, and the input device of the computer device may be a touch layer covering the display screen, or a button, trackball or touchpad provided on the housing of the computer device, or an external keyboard, touchpad or mouse, etc.

[0077] Those skilled in the art will appreciate that the various modules in the device may be adaptively split or merged, and such splitting or merging of specific modules will not cause the technical solution to deviate from the principles of the present invention. Therefore, the technical solutions after splitting or merging will fall within the protection scope of the present invention.

Claims

1. A heat storage control system for a photovoltaic heat storage electric heating device, characterized in that: It includes a heat storage component module and a control module; The thermal storage component module includes photovoltaic, photovoltaic thermal storage type electric heating device and heat using device; wherein the photovoltaic thermal storage type electric heating device can convert photovoltaic electric energy and grid electric energy into thermal energy for storage, and provide heat for the heat using device; The control module includes an energy cycle module, a historical data module, a prediction data module and an evaluation module; The energy cycle module is provided with a valley-light-peak cycle, wherein the valley-light-peak cycle includes at least a valley power period, a peak power period and a photovoltaic operation period, wherein the valley power period is provided before the peak power period; The historical data module includes historical energy data generated by historical valley-light-peak cycles, wherein the historical energy data includes the historical total heat demand of heat-using devices and the historical photovoltaic surplus remaining after photovoltaics supply loads; The prediction data module includes a parameter module and a prediction energy module; The parameter module includes the electric-heat conversion parameters of the photovoltaic thermal storage type electric heating device and the environmental parameters that cause energy changes due to changes in environmental conditions; The predicted energy module can predict the predicted energy data generated in the future valley-light-peak cycle based on the historical energy data generated in the historical valley-light-peak cycle, the electric-heat conversion parameters and the environmental parameters; the predicted energy data includes the predicted total heat demand of the heat-using device and the predicted photovoltaic surplus remaining after the photovoltaic supply load; The evaluation module can determine whether the heat converted from the predicted photovoltaic surplus in the future valley-light-peak cycle is sufficient to supply the heat-using device. When the judgment is no, the photovoltaic thermal storage electric heating device needs to pre-store heat during the valley electricity period of the future valley-light-peak cycle.

2. The heat storage control system for a photovoltaic thermal storage type electric heating device according to claim 1, characterized in that: The valley-light-peak cycle includes a plurality of valley electricity time periods, and the photovoltaic thermal storage type electric heating device can store heat in the plurality of valley electricity time periods respectively.

3. The heat storage control system for a photovoltaic thermal storage electric heating device according to claim 1, characterized in that: The environmental parameters include temperature-heat demand coefficient k1 and light-photovoltaic power coefficient k2; the electric-thermal conversion parameters include photovoltaic electricity-thermal storage conversion rate η1 and grid electricity-thermal storage conversion rate η2; Among them, k1 represents the rate of change of heat required to maintain heating demand when the unit temperature changes; k2 represents the rate of change of photovoltaic power generation when the unit light intensity changes; η1 represents the conversion rate of the photovoltaic thermal storage type electric heating device to convert photovoltaic electricity into heat; η2 represents the conversion rate of the photovoltaic thermal storage type electric heating device to convert grid electricity into heat.

4. The heat storage control system for a photovoltaic thermal storage type electric heating device according to claim 1, characterized in that: The thermal storage assembly module also includes a power detection device, which can obtain the remaining power after the photovoltaic power supplies the self-use load.

5. A method for using the heat storage control system for a photovoltaic thermal storage type electric heating device according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1, setting the valley-light-peak cycle T, including the valley power period Tg, the photovoltaic working period Tu and the peak power period Tf; S2, set the i-th valley-light-peak cycle T that has occurred i Including valley period Tg i , Photovoltaic working period Tu i and peak power period Tf i ; Get the valley-light-peak period T i The average temperature of i And use heat device in T i The total historical heat demand EF i ; Get the photovoltaic working period Tu i The average light intensity ω i And the historical photovoltaic surplus EG remaining after photovoltaic supplies the load i ; Get the historical photovoltaic surplus EG i Heat gained from conversion η1EG i , where η1 is the photovoltaic electricity-heat storage conversion rate of the photovoltaic heat storage type electric heating device; S3, set the i+1th valley-light-peak cycle T that has not occurred i+1 Including valley period Tg i+1 , Photovoltaic working period Tu i+1 and peak power period Tf i+1 ; Get the valley-light-peak period T based on weather forecast i+1 The predicted average temperature θ i+1 and photovoltaic working period Tu i+1 The predicted light intensity ω i+1 ; S4, according to the valley-light-peak cycle T i The total historical heat demand of the medium-use heat device EF i , get the i+1th valley-light-peak period T i+1 Forecast total heat demand EF of medium-use heat equipment i+1 = [1-k1(θ i+1 -θ i )]EF i , where k1 is the temperature-heat demand coefficient; According to the valley-light-peak cycle T i The historical PV surplus EG i Get the valley-light-peak period T i+1 Predicted PV surplus EG i+1 =[1+k2 (ω i+1 -ω i ) ]EG i , where k2 is the light-photovoltaic power coefficient; Get the predicted photovoltaic surplus EG i+1 Heat that can be converted η1EG i+1 ; S5, when η1EG i+1 ≥EF i+1 When the photovoltaic thermal storage type electric heating device converts all photovoltaic electricity and stores η1EG i+1 Calories When η1EG i+1 <EF i+1 When the photovoltaic thermal storage type electric heating device converts and stores η1EG through photovoltaic electricity i+1 The heat, and in the valley period Tg i+1 Obtain grid electricity for heat storage.

6. The method for the heat storage control system for a photovoltaic thermal storage type electric heating device according to claim 5, characterized in that: In step S5, when η1EG i+1 <EF i+1 When the valley-light-peak period T i+1 Valley power period Tg i+1 Obtained from the power grid (EF i+1 -η1EG i+1 ) / η2 of electricity, where η2 is the grid electricity-heat storage conversion rate.

7. The method for the heat storage control system for a photovoltaic thermal storage type electric heating device according to claim 6, characterized in that: The maximum conversion power of the photovoltaic thermal storage type electric heating device is set to Pe, and the remaining power after photovoltaic power supplies the self-use load is Pu; Set the valley-light-peak cycle T i+1 Valley power period Tg i+1 and photovoltaic working period Tu i+1 Have a common period TW; When TW=0, the photovoltaic thermal storage type electric heating device is in the valley power period Tg i+1 Convert grid electricity to store heat at the maximum conversion power Pe; When TW≠0, During the common period, the photovoltaic thermal storage type electric heating device converts photovoltaic electricity with a power of Pu, and converts grid electricity with a power of Pe-Pu.

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