Electro-thermal film heating system based on light storage direct-flexible heating and control method of electro-thermal film heating system

Abstract

The invention provides an electro-thermal film heating system based on light storage direct flexibility and a control method thereof.The electro-thermal film heating system based on light storage direct flexibility comprises a direct-current bus, and the direct-current bus is connected with an electro-thermal film heating system, an alternating-current power source, a photovoltaic module and an electrochemical energy storage battery cabinet; the alternating current power supply is connected with the direct current bus through an alternating current-direct current bidirectional converter; the photovoltaic module is connected with the direct current bus through a photovoltaic direct current-direct current converter; the electrochemical energy storage battery cabinet is connected with the direct current bus through an energy storage direct current-direct current bidirectional converter; the electric heating film heating system comprises an electric heating film phase change heat storage floor, an electric heating film control device and a direct-current power cable, and the electric heating film control device is connected with the direct-current bus through the direct-current power cable. The method is simple, reliable, green and low-carbon, and the energy utilization rate can be increased.

Description

Technical Field

[0001] The present invention belongs to the technical field of renewable energy utilization, and specifically relates to an electric heating film heating system based on light storage and direct flexibility and a control method thereof. Background Art

[0002] The energy consumption of building operation accounts for about 20% of the total energy consumption in the country. Under the background of dual carbon, building energy conservation has attracted more and more social attention. Since the perceived temperature of radiant heating is 2 to 3°C higher than that of radiator heating or air-conditioning heating at the same room temperature, and the room temperature of radiant heating can be 2 to 3°C lower than that of air-conditioning heating, radiant heating can consume more than 30% less energy than air-conditioning or radiator heating. At the same time, radiant heating has the characteristics of uniform temperature, low wind speed, and high comfort. In recent years, radiant heating has been used more and more. Compared with hot water radiant heating, electric heating film radiant heating has the advantages of small initial investment, simple control, and less space occupied, so it is widely used in areas without centralized heating.

[0003] However, the current application of electric heating film radiation heating system has the following problems:

[0004] 1) Complex system control: The system integrates renewable energy generation such as solar energy and wind power, city electricity, energy storage and electric film heating system. It is necessary to set up an energy management system to achieve a balance between power generation, power consumption and power storage through communication and control between power electronic devices;

[0005] 2) Low reliability: The control system is complex and relies on the communication system. When the communication system is interrupted or fails, the system cannot operate normally. When a large amount of battery energy storage is configured, when the battery fails, the normal operation of the system cannot be guaranteed.

[0006] 3) Low energy efficiency: Before renewable energy is effectively used, it goes through multiple links such as battery charging, discharging, and inversion, resulting in high energy loss and low energy efficiency;

[0007] 4) High investment: In order to ensure the normal operation of the system, multiple inverters, communication equipment, communication cables and controllers are configured, which increases the system investment; in order not to use AC power during peak and flat power periods, large-capacity energy storage devices are required, which requires high investment.

[0008] Therefore, it is necessary to design a simple, reliable, green, low-carbon, energy-efficient electric heating system based on solar storage and direct flexible heating and its control method to solve the current technical problems. Summary of the invention

[0009] In view of the deficiencies in the prior art, the present invention provides a simple, reliable, green, low-carbon, energy-efficient electric heating film system based on solar energy storage and direct-flexible heating, and a control method thereof.

[0010] The technical solution of the present invention is: an electrothermal film heating system based on photovoltaic storage and direct-flexible, comprising a DC bus, to which the electrothermal film heating system, an AC power supply, a photovoltaic module, and an electrochemical energy storage battery cabinet are connected;

[0011] The AC power supply is connected to the DC bus through an AC-DC bidirectional converter;

[0012] The photovoltaic assembly is connected to the DC bus via a photovoltaic DC-DC converter;

[0013] The electrochemical energy storage battery cabinet is connected to the DC bus via an energy storage DC-DC bidirectional converter;

[0014] The electric heating film heating system includes an electric heating film phase change heat storage floor, an electric heating film control device and a DC power cable. The electric heating film control device is connected to the DC bus through the DC power cable.

[0015] The electrothermal film heating system also includes a phase change wall and / or a phase change ceiling.

[0016] The phase change wall comprises a wall finishing layer, a wall rigid phase change energy storage layer, a wall thermal insulation layer and a wall, which are arranged in sequence from the inside to the outside.

[0017] The phase-change ceiling comprises a ceiling finishing layer, a ceiling rigid phase-change energy storage layer, and a ceiling thermal insulation layer which are sequentially arranged from the inside to the outside.

[0018] The electric heating film phase change heat storage floor comprises a floor finishing layer, a heat-spreading layer, an electric heating film, a floor rigid phase change energy storage layer, a floor heat-insulating layer, and a floor, which are arranged in sequence from top to bottom.

[0019] The electric heating film control device includes a shell, on which an input power interface and an output power interface are provided; a multi-channel DC-DC converter and a controller are provided inside the shell, an input DC circuit breaker is connected between the input end of the multi-channel DC-DC converter and the input power interface, and an output DC circuit breaker is connected between the output end of the multi-channel DC-DC converter and the output power interface; a temperature sensor and a DC voltage sensor are connected to the controller, and the DC voltage sensor is used to detect the voltage value of the DC bus.

[0020] A housing front door is arranged on the front side of the housing.

[0021] An information interaction screen is arranged on the front door of the shell.

[0022] The control method of the electric heating film heating system based on light storage direct flexible includes the following steps:

[0023] In the electric heating film control device, the indoor set temperature value T is presetn ;

[0024] Detect the DC bus voltage value U and the indoor temperature value T;

[0025] When U0≤U≤U2, the bus voltage deviates from the reference voltage by ΔU 20 The electric heating film control device adjusts its output voltage, and the output voltage deviates from the working reference voltage of the electric heating film by ΔU r =k×ΔU 20 , where k is the proportionality coefficient; when T n <T<T n +ΔT2, the electric heating film control device is controlled to output voltage to the electric heating film phase change heat storage floor to maintain the indoor temperature at the set temperature value T n ; The photovoltaic DC-DC converter operates in the maximum power point tracking control mode, and the energy storage DC-DC bidirectional converter and AC-DC bidirectional converter are in a dormant state;

[0026] When U1≤U≤U0, the bus voltage deviates from the reference voltage by ΔU 10 The electric heating film control device adjusts its output voltage, and the output voltage deviates from the working reference voltage of the electric heating film by ΔU r =k×ΔU 10 , where k is the proportionality coefficient; when T n -ΔT1<T<T n When the electric heating film control device is controlled to output voltage to the electric heating film phase change heat storage floor, the indoor temperature is maintained at the set temperature value T n ; The photovoltaic DC-DC converter operates in the maximum power point tracking control mode, and the energy storage DC-DC bidirectional converter and AC-DC bidirectional converter are in a dormant state;

[0027] When U2≤U≤U4, the energy storage DC-DC bidirectional converter controls the electrochemical energy storage battery cabinet to put it in charging mode until the electrochemical energy storage battery cabinet is charged to the maximum SOC, where the charging power is proportional to the value of the bus voltage U deviating from the voltage U2; the photovoltaic DC-DC converter operates in the maximum power point tracking control mode, the AC-DC bidirectional converter is in a dormant state, and the electric heating film control device outputs a voltage to the electric heating film phase change heat storage floor to maintain the indoor temperature at the set temperature value T n ;

[0028] When U3≤U≤U1, the energy storage DC-DC bidirectional converter controls the electrochemical energy storage battery cabinet to put it in discharge mode until the electrochemical energy storage battery cabinet is discharged to the minimum SOC, where the discharge power is proportional to the value of the bus voltage U deviating from the voltage U1; the photovoltaic DC-DC converter operates in the maximum power point tracking control mode, the AC-DC bidirectional converter is in a dormant state, and the electric heating film control device outputs a voltage to the electric heating film phase change heat storage floor to maintain the indoor temperature at the set temperature value T n ;

[0029] When U4≤U≤U5, the AC-DC bidirectional converter is in the inverter state, and the surplus photovoltaic power generation is output to the AC power supply for use by other electrical equipment. The output power is proportional to the value of the bus voltage U deviating from the voltage U1; the photovoltaic DC-DC converter operates in the maximum power point tracking control mode, and the energy storage DC-DC bidirectional converter controls the electrochemical energy storage battery cabinet to put it in the charging mode until the electrochemical energy storage battery cabinet is charged to the maximum SOC. The electric heating film control device outputs voltage to the electric heating film phase change heat storage floor to maintain the indoor temperature at the set temperature value T n ;

[0030] When U6≤U≤U3, the AC-DC bidirectional converter is in a rectifying state, and the AC power supply is used to supplement the power consumption. The output power is proportional to the value of the bus voltage U deviating from the voltage U3. The photovoltaic DC-DC converter operates in the maximum power point tracking control mode. The energy storage DC-DC bidirectional converter controls the electrochemical energy storage battery cabinet to put it in a discharge mode until the electrochemical energy storage battery cabinet is discharged to the minimum SOC. The electric heating film control device outputs a voltage to the electric heating film phase change heat storage floor to maintain the indoor temperature at the set temperature value T n ;

[0031] When U5≤U≤U7, the photovoltaic DC-DC converter operates in the limited power operation mode, the AC-DC bidirectional converter is in the maximum power inverter state, the energy storage DC-DC bidirectional converter controls the electrochemical energy storage battery cabinet to put it in the charging mode until the electrochemical energy storage battery cabinet is charged to the maximum SOC, and the electric heating film control device outputs voltage to the electric heating film phase change thermal storage floor to maintain the indoor temperature at the set temperature value T n ;

[0032] When U<U6, the photovoltaic DC-DC converter operates in the maximum power point tracking control mode, the AC-DC bidirectional converter is in the maximum power rectification state, the energy storage DC-DC bidirectional converter controls the electrochemical energy storage battery cabinet to put it in the discharge mode until the electrochemical energy storage battery cabinet is discharged to the minimum SOC, and controls the output DC circuit breakers inside the electric heating film control device to be disconnected one by one, so that the bus voltage U is restored to be greater than the voltage U6;

[0033] When U7<U, the system stops working.

[0034] The electric heating film control device 12 controls its output voltage through a proportional integral control mode so that the indoor temperature is maintained at a set temperature value T n .

[0035] Through the control method of the above-mentioned electrothermal film heating system based on photo-storage direct-flexible, when the solar photovoltaic power generation is sufficient at noon, the DC bus voltage increases, the electrothermal film heating system controller increases the output voltage, the heating power increases, and the heat is stored through the phase change material; when the indoor temperature rises significantly and exceeds the set temperature, the electrochemical energy storage cabinet begins to store electricity; when the electrochemical energy storage cabinet is fully charged, the photovoltaic power generation is supplied to other electrical equipment in the building through a bidirectional AC-DC converter.

[0036] At night, when there is no photovoltaic power generation, the DC bus voltage decreases, the electric heating film heating system controller reduces the output voltage, the heating power is reduced, and the room temperature is maintained by releasing the heat stored in the phase change material; when the bus voltage is further reduced, the electrochemical energy storage cabinet discharges to supply the electric heating film to maintain the room temperature; when the bus voltage is further reduced, the mains power is rectified by a bidirectional AC-DC converter to supply power to the electric heating film for heating.

[0037] Beneficial effects of the present invention:

[0038] (1) Simple and reliable, using non-communication control with bus voltage as signal, by setting up an electric heating film phase change thermal storage floor, using the phase change material in the electric heating film phase change thermal storage floor to store heat, without setting up a large number of batteries for energy storage, simple implementation, low investment, and reliable operation;

[0039] (2) Green and low-carbon, using the DC bus voltage as a signal, the electric heating film phase change heat storage floor gives priority to consuming photovoltaic power generation, reducing the power conversion link, and has high energy utilization efficiency. It reduces the power conversion link through DC distribution, reduces energy loss, and improves energy utilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the structure of the electric heating film heating system based on light storage and direct flexibility in the present invention.

[0041] Figure 2 It is a schematic structural diagram of the electric heating film phase change heat storage floor in the present invention.

[0042] Figure 3 It is a structural schematic diagram of the phase change wall in the present invention.

[0043] Figure 4 It is a structural schematic diagram of the phase change ceiling in the present invention.

[0044] Figure 5It is the principle diagram of the electric heating film control device in the present invention.

[0045] Figure 6 It is a schematic diagram of the structure of the front door of the housing of the electric heating film control device in the present invention.

[0046] Figure 7 It is a schematic diagram of the control method of the electric heating film heating system based on light storage and direct flexibility in the present invention. DETAILED DESCRIPTION

[0047] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present invention and its application or use. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present invention thorough and complete and to fully express the scope of the present invention to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, rather than as limitations.

[0048] The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprise" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0049] like Figure 1As shown, the electrothermal film heating system based on photoelectric storage and direct-flexible heating comprises a DC bus 2, to which an electrothermal film heating system 1, an AC power supply 7, a photovoltaic module 3, and an electrochemical energy storage battery cabinet 5 are connected; the AC power supply 7 is connected to the DC bus 2 via an AC-DC bidirectional converter 8; the photovoltaic module 3 is connected to the DC bus 2 via a photovoltaic DC-DC converter 4; the electrochemical energy storage battery cabinet 5 is connected to the DC bus 2 via an energy storage DC-DC bidirectional converter 6; the electrothermal film heating system 1 comprises an electrothermal film phase change heat storage floor 11, an electrothermal film control device 12 and a DC power cable 9, the electric The thermal film control device 12 is connected to the DC bus 2 through a DC power cable 9; in this embodiment, it is simple and reliable, and adopts non-communication control with the bus voltage as a signal. By setting the electric heating film phase change heat storage floor 11, the phase change material in the electric heating film phase change heat storage floor 11 is used to store heat. There is no need to set up a large number of batteries for energy storage, and the implementation is simple, the investment is small, and the operation is reliable; green and low-carbon, with the DC bus 1 voltage as a signal, the electric heating film phase change heat storage floor 11 is operated to give priority to the consumption of photovoltaic power generation, reduce the power conversion link, and have high energy utilization efficiency. The power conversion link is reduced through the DC power distribution method, which reduces energy loss and improves energy utilization efficiency.

[0050] In some embodiments, the electric film heating system 1 further includes a phase change wall 13 and / or a phase change ceiling 14. By providing the phase change wall 13 and the phase change ceiling 14, the amount of phase change material can be increased, further improving the indoor heat storage capacity.

[0051] In some embodiments, as a specific implementation of the phase change wall 13, Figure 3 As shown, the phase change wall includes a wall finishing layer 131, a wall rigid phase change energy storage layer 132, a wall insulation layer 133, and a wall 134, which are arranged in sequence from the inside to the outside; wherein the wall 134 serves as the main supporting structure of the phase change wall 13; the wall insulation layer 133 is used to reduce heat loss to the outside; the wall rigid phase change energy storage layer 132 is used for heat storage; and the wall finishing layer 131 is used to improve the appearance of the phase change wall 13 and play a decorative role.

[0052] In some embodiments, as a specific implementation of the phase change ceiling 14, Figure 4 As shown, the phase change ceiling includes a ceiling finishing layer 141, a ceiling rigid phase change energy storage layer 142, and a ceiling insulation layer 143 which are arranged in sequence from the inside to the outside; wherein the ceiling insulation layer 143 is used to reduce heat loss to the outside; the ceiling rigid phase change energy storage layer 142 is used to store heat; and the ceiling finishing layer 141 is used to improve the appearance of the phase change ceiling 14 and play a decorative role.

[0053] In some embodiments, as a specific implementation of the electric heating film phase change thermal storage floor 11, Figure 2As shown, the electric heating film phase change heat storage floor 11 has a floor finishing layer 111, a heat-averaging layer 112, an electric heating film 113, a floor rigid phase change energy storage layer 114, a floor insulation layer 115, and a floor 116 arranged in sequence from top to bottom; wherein the floor insulation layer 115 is used to reduce heat loss to the outside; the floor rigid phase change energy storage layer 114 is used to store heat; the electric heating film 113 generates heat to increase the indoor temperature after being energized; the heat-averaging layer 112 is used to evenly transfer heat and improve comfort; the floor finishing layer 111 is used to improve the appearance of the electric heating film phase change heat storage floor 11 and play a decorative role.

[0054] In some embodiments, Figure 5 As shown, the electrothermal film control device 12 includes a shell 121, on which an input power interface 122 and an output power interface 128 are provided; a multi-channel DC-DC converter 124 and a controller are provided inside the shell 121, an input DC circuit breaker 123 is connected between the input end of the multi-channel DC-DC converter 124 and the input power interface 122, and an output DC circuit breaker 127 is connected between the output end of the multi-channel DC-DC converter 124 and the output power interface 128; a temperature sensor 120 and a DC voltage sensor 125 are connected to the controller 126, and the DC voltage sensor 125 is used to detect the voltage value of the DC bus 2; specifically, multiple output ends of the multi-channel DC-DC converter 124 are respectively connected to the output DC circuit breaker 127, so that the electrothermal film control device 12 has a one-way input and multiple-way output form, so that multiple groups of electrothermal film phase change heat storage floors 11 can be controlled.

[0055] In some embodiments, Figure 6 As shown, a shell front door 129 is provided on the front side of the shell 121; further, an information interaction screen 1291 is provided on the shell front door 129, and the information interaction screen 1291 is used to display operating parameters such as the DC bus 2 voltage and the indoor temperature value, and to set parameters such as the indoor set temperature value.

[0056] In some embodiments, Figure 7 As shown, a control method for a light-storage direct-flexible electric heating film heating system is disclosed, comprising the following steps:

[0057] The indoor set temperature value T is preset in the electric heating film control device 12. n ;

[0058] Detect the DC bus voltage 2 value U and the indoor temperature value T;

[0059] When U0≤U≤U2, the bus voltage 2 deviates from the reference voltage by ΔU 20The electric heating film control device 12 adjusts its output voltage, and the output voltage deviates from the electric heating film working reference voltage by ΔU r =k×ΔU 20 , where k is the proportionality coefficient; when T n <T<T n +ΔT2 (ΔT2 is the indoor temperature rise value that the indoor personnel considers acceptable for the comfort change within a short period of time, which can be 4°C), the electric heating film control device 12 is controlled to output voltage to the electric heating film phase change heat storage floor 11 to maintain the indoor temperature at the set temperature value T n ; The photovoltaic DC-DC converter 4 operates in a maximum power point tracking control mode, and the energy storage DC-DC bidirectional converter 6 and the AC-DC bidirectional converter 8 are in a dormant state;

[0060] When U1≤U≤U0, the bus voltage 2 deviates from the reference voltage by ΔU 10 The electric heating film control device 12 adjusts its output voltage, and the output voltage deviates from the electric heating film working reference voltage by ΔU r =k×ΔU 10 , where k is the proportionality coefficient; when T n -ΔT1<T<T n When (ΔT1 is the indoor temperature drop value that the indoor personnel considers the comfort change acceptable within a short period of time, which can be 3°C), the electric heating film control device 12 is controlled to output voltage to the electric heating film phase change heat storage floor 11 to maintain the indoor temperature at the set temperature value T n ; The photovoltaic DC-DC converter 4 operates in a maximum power point tracking control mode, and the energy storage DC-DC bidirectional converter 6 and the AC-DC bidirectional converter 8 are in a dormant state;

[0061] When U2≤U≤U4, the energy storage DC-DC bidirectional converter 6 controls the electrochemical energy storage battery cabinet 5 to be in charging mode until the electrochemical energy storage battery cabinet 5 is charged to the maximum SOC, wherein the charging power is proportional to the value of the bus voltage U deviating from the voltage U2; the photovoltaic DC-DC converter 8 operates in the maximum power point tracking control mode, the AC-DC bidirectional converter 8 is in a dormant state, and the electric heating film control device 12 outputs a voltage to the electric heating film phase change heat storage floor 11 to maintain the indoor temperature at the set temperature value T n ;

[0062] When U3≤U≤U1, the energy storage DC-DC bidirectional converter 6 controls the electrochemical energy storage battery cabinet 5 to be in the discharge mode until the electrochemical energy storage battery cabinet 5 is discharged to the minimum SOC, wherein the discharge power is proportional to the value of the bus voltage U deviating from the voltage U1; the photovoltaic DC-DC converter 8 operates in the maximum power point tracking control mode, the AC-DC bidirectional converter 8 is in the dormant state, and the electric heating film control device 12 outputs a voltage to the electric heating film phase change heat storage floor 11 to maintain the indoor temperature at the set temperature value T n ;

[0063] When U4≤U≤U5, the AC-DC bidirectional converter 8 is in the inverter state, and the surplus photovoltaic power generation is output to the AC power supply 7 for use by other electrical equipment. The output power is proportional to the value of the bus voltage U deviating from the voltage U1; the photovoltaic DC-DC converter 3 operates in the maximum power point tracking control mode, and the energy storage DC-DC bidirectional converter 6 controls the electrochemical energy storage battery cabinet 5 to put it in the charging mode until the electrochemical energy storage battery cabinet 5 is charged to the maximum SOC. The electric heating film control device 12 outputs a voltage to the electric heating film phase change heat storage floor 11 to maintain the indoor temperature at the set temperature value T n ;

[0064] When U6≤U≤U3, the AC-DC bidirectional converter 8 is in a rectifying state, and the AC power supply 7 supplements the power consumption. The output power is proportional to the value of the bus voltage U deviating from the voltage U3. The photovoltaic DC-DC converter 4 operates in a maximum power point tracking control mode. The energy storage DC-DC bidirectional converter 6 controls the electrochemical energy storage battery cabinet 7 to put it in a discharge mode until the electrochemical energy storage battery cabinet 7 is discharged to the minimum SOC. The electric heating film control device 12 outputs a voltage to the electric heating film phase change heat storage floor 11 to maintain the indoor temperature at the set temperature value T n ;

[0065] When U5≤U≤U7, the photovoltaic DC-DC converter 3 operates in the limited power operation mode, the AC-DC bidirectional converter 8 is in the maximum power inversion state, the energy storage DC-DC bidirectional converter 6 controls the electrochemical energy storage battery cabinet 5 to put it in the charging mode until the electrochemical energy storage battery cabinet 5 is charged to the maximum SOC, and the electric heating film control device 12 outputs a voltage to the electric heating film phase change heat storage floor 11 to maintain the indoor temperature at the set temperature value T n ;

[0066] When U<U6, the photovoltaic DC-DC converter 3 operates in the maximum power point tracking control mode, the AC-DC bidirectional converter 8 is in the maximum power rectification state, the energy storage DC-DC bidirectional converter 6 controls the electrochemical energy storage battery cabinet 5 to put it in the discharge mode until the electrochemical energy storage battery cabinet 5 is discharged to the minimum SOC, and controls the output DC circuit breakers 127 inside the electric heating film control device 12 to be disconnected one by one, so that the bus voltage U is restored to be greater than the voltage U6;

[0067] When U7<U, the system stops working.

[0068] In the above embodiment, the electric heating film control device 12 controls its output voltage through a proportional-integral control mode.

[0069] By means of the control method of the electrothermal film heating system based on light storage and direct flexibility, when the solar photovoltaic assembly 3 generates sufficient electricity at noon, the voltage of the DC bus 2 increases, the controller 126 of the electrothermal film heating system 1 increases the output voltage, the heating power increases, and heat is stored through the phase change materials in the ground, walls, and ceilings; when the indoor temperature increases significantly and exceeds the set temperature, the electrochemical energy storage battery cabinet 5 starts to store electricity; when the electrochemical energy storage battery cabinet 5 is fully charged, the photovoltaic power generation is supplied to other electrical equipment in the building through the AC-DC bidirectional converter 8; at night, when there is no photovoltaic power generation, the voltage of the DC bus 2 decreases, the controller 126 of the electrothermal film heating system 1 decreases the output voltage, the heating power decreases, and the room temperature is maintained by releasing the heat stored in the phase change material; when the bus voltage 2 further decreases, the electrochemical energy storage battery cabinet 5 discharges and supplies the electrothermal film heating system 1 for use to maintain the room temperature; when the bus voltage 2 further decreases, the city power is rectified through the AC-DC bidirectional converter 8 to supply power to the electrothermal film heating system 1 for heating.

[0070] So far, various embodiments of the present invention have been described in detail. In order to avoid obscuring the concept of the present invention, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0071] The above-mentioned embodiments only express some implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A solar-storage direct-flexible electric heating film heating system, characterized in that: It includes a DC bus, to which an electric film heating system, an AC power supply, a photovoltaic module, and an electrochemical energy storage battery cabinet are connected; The AC power supply is connected to the DC bus through an AC-DC bidirectional converter; The photovoltaic assembly is connected to the DC bus via a photovoltaic DC-DC converter; The electrochemical energy storage battery cabinet is connected to the DC bus via an energy storage DC-DC bidirectional converter; The electric heating film heating system includes an electric heating film phase change heat storage floor, an electric heating film control device and a DC power cable. The electric heating film control device is connected to the DC bus through the DC power cable.

2. The light-storage direct-flexible electric heating film heating system according to claim 1 is characterized in that: The electrothermal film heating system also includes a phase change wall and / or a phase change ceiling.

3. The light-storage direct-flexible electric heating film heating system according to claim 2 is characterized in that: The phase change wall comprises a wall finishing layer, a wall rigid phase change energy storage layer, a wall thermal insulation layer and a wall, which are arranged in sequence from the inside to the outside.

4. The light-storage direct-flexible electric heating film heating system according to claim 2 is characterized in that: The phase-change ceiling comprises a ceiling finishing layer, a ceiling rigid phase-change energy storage layer, and a ceiling thermal insulation layer which are sequentially arranged from the inside to the outside.

5. The light-storage direct-flexible electric heating film heating system according to claim 1 is characterized in that: The electric heating film phase change heat storage floor comprises a floor finishing layer, a heat-spreading layer, an electric heating film, a floor rigid phase change energy storage layer, a floor heat-insulating layer, and a floor, which are arranged in sequence from top to bottom.

6. The light-storage direct-flexible electric heating film heating system according to claim 1 is characterized in that: The electric heating film control device comprises a housing, and the housing is provided with an input power interface and an output power interface; A multi-channel DC-DC converter and a controller are arranged inside the housing, an input DC circuit breaker is connected between the input end of the multi-channel DC-DC converter and the input power interface, and an output DC circuit breaker is connected between the output end of the multi-channel DC-DC converter and the output power interface; The controller is connected to a temperature sensor and a DC voltage sensor, and the DC voltage sensor is used to detect the voltage value of the DC bus.

7. The light-storage direct-flexible electric heating film heating system according to claim 6 is characterized in that: A housing front door is arranged on the front side of the housing.

8. The light-storage direct-flexible electric heating film heating system according to claim 7 is characterized in that: An information interaction screen is arranged on the front door of the shell.

9. A control method for a light-storage direct-flexible electric heating film heating system, characterized in that: The following steps are involved: In the electric heating film control device, the indoor set temperature value T is preset n ; Detect the DC bus voltage value U and the indoor temperature value T; When U0≤U≤U2, the bus voltage deviates from the reference voltage by ΔU 20 The electric heating film control device adjusts its output voltage, and the output voltage deviates from the working reference voltage of the electric heating film by ΔU r =k×ΔU 20 , where k is the proportionality coefficient; when T n <T<T n +ΔT2, the electric heating film control device is controlled to output voltage to the electric heating film phase change heat storage floor to maintain the indoor temperature at the set temperature value T n ; The photovoltaic DC-DC converter operates in the maximum power point tracking control mode, and the energy storage DC-DC bidirectional converter and AC-DC bidirectional converter are in a dormant state; When U1≤U≤U0, the bus voltage deviates from the reference voltage by ΔU 10 The electric heating film control device adjusts its output voltage, and the output voltage deviates from the working reference voltage of the electric heating film by ΔU r =k×ΔU 10 , where k is the proportionality coefficient; when T n -ΔT1<T<T n When the electric heating film control device is controlled to output voltage to the electric heating film phase change heat storage floor, the indoor temperature is maintained at the set temperature value T n ; The photovoltaic DC-DC converter operates in the maximum power point tracking control mode, and the energy storage DC-DC bidirectional converter and AC-DC bidirectional converter are in a dormant state; When U2≤U≤U4, the energy storage DC-DC bidirectional converter controls the electrochemical energy storage battery cabinet to put it in charging mode until the electrochemical energy storage battery cabinet is charged to the maximum SOC, where the charging power is proportional to the value of the bus voltage U deviating from the voltage U2; the photovoltaic DC-DC converter operates in the maximum power point tracking control mode, the AC-DC bidirectional converter is in a dormant state, and the electric heating film control device outputs a voltage to the electric heating film phase change heat storage floor to maintain the indoor temperature at the set temperature value T n ; When U3≤U≤U1, the energy storage DC-DC bidirectional converter controls the electrochemical energy storage battery cabinet to put it in discharge mode until the electrochemical energy storage battery cabinet is discharged to the minimum SOC, where the discharge power is proportional to the value of the bus voltage U deviating from the voltage U1; the photovoltaic DC-DC converter operates in the maximum power point tracking control mode, the AC-DC bidirectional converter is in a dormant state, and the electric heating film control device outputs a voltage to the electric heating film phase change heat storage floor to maintain the indoor temperature at the set temperature value T n ; When U4≤U≤U5, the AC-DC bidirectional converter is in the inverter state, and the surplus photovoltaic power generation is output to the AC power supply for use by other electrical equipment. The output power is proportional to the value of the bus voltage U deviating from the voltage U1; the photovoltaic DC-DC converter operates in the maximum power point tracking control mode, and the energy storage DC-DC bidirectional converter controls the electrochemical energy storage battery cabinet to put it in the charging mode until the electrochemical energy storage battery cabinet is charged to the maximum SOC. The electric heating film control device outputs voltage to the electric heating film phase change heat storage floor to maintain the indoor temperature at the set temperature value T n ; When U6≤U≤U3, the AC-DC bidirectional converter is in a rectifying state, and the AC power supply is used to supplement the power consumption. The output power is proportional to the value of the bus voltage U deviating from the voltage U3. The photovoltaic DC-DC converter operates in the maximum power point tracking control mode. The energy storage DC-DC bidirectional converter controls the electrochemical energy storage battery cabinet to put it in a discharge mode until the electrochemical energy storage battery cabinet is discharged to the minimum SOC. The electric heating film control device outputs a voltage to the electric heating film phase change heat storage floor to maintain the indoor temperature at the set temperature value T n ; When U5≤U≤U7, the photovoltaic DC-DC converter operates in the limited power operation mode, the AC-DC bidirectional converter is in the maximum power inverter state, the energy storage DC-DC bidirectional converter controls the electrochemical energy storage battery cabinet to put it in the charging mode until the electrochemical energy storage battery cabinet is charged to the maximum SOC, and the electric heating film control device outputs voltage to the electric heating film phase change thermal storage floor to maintain the indoor temperature at the set temperature value T n ; When U<U6, the photovoltaic DC-DC converter operates in the maximum power point tracking control mode, the AC-DC bidirectional converter is in the maximum power rectification state, the energy storage DC-DC bidirectional converter controls the electrochemical energy storage battery cabinet to put it in the discharge mode until the electrochemical energy storage battery cabinet is discharged to the minimum SOC, and controls the output DC circuit breakers inside the electric heating film control device to be disconnected one by one, so that the bus voltage U is restored to be greater than the voltage U6; When U7<U, the system stops working.

10. The control method of the light-storage direct-flexible electric heating film heating system according to claim 9 is characterized in that: The electric heating film control device controls its output voltage through a proportional integral control mode to maintain the indoor temperature at a set temperature value T n .

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