Novel multi-energy coupling combined cooling heating and power supply system and control method thereof

Abstract

The invention relates to the technical field of new energy, in particular to a novel multi-energy coupling combined cooling heating and power supply system and a control method thereof, and the system comprises a photovoltaic module, a mains supply, an energy storage battery, an inverter, a charging pile, a heat pump coupling water tank subsystem and a centralized controller. Various new energy technologies such as photovoltaic power generation, heat pump cooling / heating, water tank and battery energy storage and residual light charging are combined, and the frequency of a heat pump compressor, the return water temperature and the charging power of a charging pile are regulated and controlled by judging the output power of a photovoltaic module, the start and stop conditions of the heat pump compressor, the electric quantity of an energy storage battery and the energy of an energy storage water tank; and the system stability can be guaranteed while the system economy and the photovoltaic absorption rate can be remarkably improved.

Description

Technical Field

[0001] The present invention relates to the field of new energy technology, and in particular to a novel multi-energy coupled cooling, heating and power cogeneration system and a control method thereof. Background Art

[0002] At present, the most widely used household heating and cooling system in China is the heat pump unit. However, traditional heat pump units mainly use city electricity, cannot effectively utilize solar energy, and have no energy storage means, making it difficult to balance the matching relationship between building energy demand and supply. The most common energy storage device on the market is the battery, but the battery is expensive, and as the number of charge and discharge times increases, the energy storage performance gradually decreases. Summary of the invention

[0003] In view of the shortcomings of the prior art and to solve the problems raised in the above background technology, the present invention provides a new multi-energy coupled cooling, heating and power cogeneration system and its control method which adopts a water tank energy storage with low price and stable energy storage performance, integrates "photovoltaic and heat pump coupled energy storage (battery and water tank)", improves the photovoltaic absorption rate by regulating the operation mode of the heat pump and the charging pile, and is superior to the traditional control logic.

[0004] A novel multi-energy coupled cooling, heating and power cogeneration system and control method thereof, comprising photovoltaic modules, inverters, mains power, centralized controllers, energy storage batteries, heat pump coupled water tank systems and charging piles; the photovoltaic modules and mains power are electrically connected to the energy storage batteries, heat pump coupled water tank systems and charging piles through inverters, respectively, wherein the energy storage batteries are connected to the inverter alone, and the heat pump coupled water tank system and the charging piles are connected to the inverter in parallel; the power provided by the photovoltaic modules can be used for the charging piles or stored in batteries through the inverter, and can also be converted into the power required by the heat pump system through the inverter, and the heating and cooling are stored in the water tank, so as to achieve flexible energy management and optimize energy use under different demand conditions.

[0005] The centralized controller is respectively connected to the inverter, the energy storage battery, the heat pump coupled water tank system, and the charging pile for communication.

[0006] By using photovoltaic modules and inverters to extract energy from solar energy and replace mains electricity with photovoltaic electricity, the vast majority of household buildings' electricity needs throughout the year can be met, greatly improving the system's economic efficiency and reducing the local power grid's electricity burden. At the same time, it reduces dependence on traditional fossil fuels, reduces carbon emissions, and meets the environmental protection requirements of sustainable development.

[0007] By replacing traditional refrigeration equipment or heating equipment with a heat pump system and absorbing heat or cold from the air, it is possible to achieve the function of heating household buildings in winter or cooling them in summer, thereby improving the thermal comfort of the building while reducing power consumption.

[0008] By adding energy storage batteries and energy storage water tanks, the excess heat and cold generated by photovoltaic electricity and heat pumps can be jointly stored, which improves the system's photovoltaic absorption rate and stability while greatly reducing the system's energy storage costs.

[0009] By adding charging piles, the charging needs of household electric vehicles can be met while further improving the system's photovoltaic absorption rate.

[0010] As a further solution of the present invention, the heat pump coupled water tank system includes a heat pump circuit, one end of the heat pump circuit is provided with a terminal water supply side, the other end of the heat pump circuit is provided with a terminal water return side, the heat pump circuit from the terminal water return side to the terminal water supply side is provided with a water tank, a water pump and a heat pump unit in sequence, a bypass pipeline is provided between the terminal water return side and the terminal water supply side, a pressure differential bypass valve is provided on the bypass pipeline, and a safety valve is provided on the water tank. The provision of the bypass pipe and the pressure differential bypass valve helps to balance the pressure and flow inside the system, prevent system failure or performance degradation caused by pressure fluctuations, and improve the stability and reliability of the system.

[0011] As a further solution of the present invention, a control method for a novel multi-energy coupled cooling, heating and power cogeneration system is provided. The heat pump coupled water tank system includes controlling the inverter energy storage battery, the heat pump coupled water tank system and the charging pile through the centralized controller to realize the operation of the system in winter heating mode and summer cooling mode. The winter heating mode and summer cooling mode are to control the heat pump compressor frequency, return water temperature and charging pile charging power in real time by judging the output power of the photovoltaic module, the start and stop status of the heat pump compressor, the power of the energy storage battery and the energy of the energy storage water tank. By replacing the traditional cooling / heating equipment with the heat pump system and absorbing heat / coldness from the air, the functions of winter heating / summer cooling for household buildings can be realized, improving the thermal comfort of the building while reducing power consumption.

[0012] As a further solution of the present invention, the winter heating mode:

[0013] Insufficient radiation during the day: When the battery power is low, the heat pump system switches to ECO mode, the heating set temperature is lowered, and the charging pile is set to non-rechargeable; when the battery power is high and the compressor is operating normally, the heat pump system switches to standard mode, the heating set temperature is increased, and the charging pile is set to non-rechargeable; when the battery power is high and the compressor stops running, the heat pump system switches to standard mode, the heating set temperature is increased, and the charging pile is set to low-power charging; ECO mode and standard mode adjust the working mode of the heat pump to avoid excessive power consumption when the radiation is insufficient and the battery power is low, thereby reducing unnecessary energy consumption. When the radiation is insufficient and the battery power is low, the system will automatically switch to ECO mode and lower the set temperature to reduce energy consumption; when the radiation is insufficient and the battery power is sufficient, it will switch to standard or BOOST mode to optimize heating efficiency.

[0014] When there is sufficient radiation during the day: the battery is low, the heat pump system switches to standard mode, the heating set temperature is increased, and the charging pile is set to non-charging; when the battery is high and the compressor is operating normally, the heat pump system switches to BOOST mode, the heating set temperature is increased, and the charging pile is set to low-power charging; when the battery is high and the compressor stops running, the heat pump system switches to BOOST mode, the heating set temperature is increased, and the charging pile is set to high-power charging; the BOOST mode will provide accelerated heating when there is sufficient radiation during the day and the battery is high, quickly raising the indoor temperature and providing users with a fast and comfortable temperature control experience.

[0015] At night: The heat pump system switches to ECO mode, the heating setting temperature is lowered, and the charging station is set to non-charging; the system automatically lowers the temperature to ensure warmth without wasting electricity.

[0016] In the periodic control process, if the state of the new multi-energy coupling system does not meet the judgment conditions, the settings of the previous cycle will continue to be maintained. According to the change of battery power, the power setting of the charging pile is also adjusted accordingly. When the battery power is low, the charging pile is set to non-charging to avoid affecting the heating system; when the battery power is high and the radiation is good, it is set to low power or high power charging to ensure that the battery is charged in time and does not affect the heating.

[0017] As a further solution of the present invention, the summer cooling mode:

[0018] Insufficient radiation during the day: When the battery is low, the heat pump system switches to ECO mode, the cooling set temperature is increased, and the charging pile is set to non-charging; reduce the energy consumption of the compressor and heat pump system to prevent excessive energy consumption. This adjustment helps to extend the battery life and avoid excessive battery discharge. When the battery is high and the compressor is operating normally, the heat pump system switches to standard mode, the cooling set temperature is lowered, and the charging pile is set to non-charging; when the battery is high and the compressor stops running, the heat pump system switches to standard mode, the cooling set temperature is lowered, and the charging pile is set to low-power charging. Ensure that the system can use as much power as possible while meeting the cooling needs.

[0019] Sufficient radiation during the day: When the battery is low, the heat pump system switches to standard mode, the cooling set temperature is lowered, and the charging pile is set to non-charging; when the battery is high and the compressor is operating normally, the heat pump system switches to BOOST mode, the cooling set temperature is lowered, and the charging pile is set to low-power charging; when the battery is high and the compressor stops running, the heat pump system switches to BOOST mode, the cooling set temperature is lowered, and the charging pile is set to high-power charging; ensure that the system can use as much electricity as possible while meeting the cooling needs.

[0020] At night: when the battery power is high, the heat pump system switches to ECO mode, the refrigeration setting temperature is increased, and the charging pile is set to non-rechargeable; when the battery power is low and the cooling capacity is high, the heat pump is shut down, and the charging pile is set to non-rechargeable; when the battery power is low and the cooling capacity is low, the system is shut down, and the charging pile is set to non-rechargeable; increase the set temperature appropriately to ensure comfort and energy saving; when the battery power is low, the system will stop running to avoid excessive energy consumption.

[0021] In the periodic control process, if the state of the new multi-energy coupling system does not meet the judgment conditions, the settings of the previous cycle will continue to be maintained. This avoids frequent system switching due to environmental fluctuations or emergencies, and improves the stability and reliability of the system. The system's automatic adjustment and self-protection functions ensure that the system can operate efficiently and stably under any battery power or environmental conditions.

[0022] As a further solution of the present invention, the heat pump coupled water tank system also includes heat storage conditions, heat release conditions, direct supply and heat storage conditions, cold storage conditions, cold release conditions, and direct supply and cold storage conditions that are automatically switched according to actual conditions. The winter heating mode and the summer cooling mode automatically select different conditions for operation. The heat pump coupled water tank system automatically switches between different conditions such as heat storage, heat release, cold storage, and cold release, so that the system can automatically adjust the operating state according to seasonal needs and environmental conditions, and has significant advantages, including improving system adaptability and flexibility, optimizing energy utilization efficiency, enhancing system stability, realizing intelligent control, and improving user experience.

[0023] As a further solution of the present invention, the winter heating mode includes a heat storage condition, a heat release condition, and a direct supply and heat storage condition;

[0024] Heat storage working condition: the indoor temperature reaches the set temperature, the heat pump does not reach the heating set temperature, the water pump and the heat pump system are turned on, and the terminal is closed; the cold water in the upper layer of the water tank is pumped into the heat pump system through the water pump, and after being heated, it flows back to the lower layer of the water tank through the pressure difference bypass valve to complete the cycle;

[0025] Heat release condition: the indoor temperature has not reached the set temperature, and the heat pump has reached the heating set temperature. The water pump and the terminal are turned on, and the heat pump system is turned off; the water pump sends the hot water from the upper layer of the water tank to the terminal, and after completing the heat exchange with the building, it flows back to the lower layer of the water tank, completing the cycle;

[0026] Direct supply and heat storage working conditions: the indoor temperature has not reached the set temperature, and the heat pump has not reached the heating set temperature; the water pump, heat pump system and terminal are turned on; the water pump sends the cold water from the upper layer of the water tank into the heat pump system, which enters the terminal after heating, completes the heat exchange with the building, and flows back to the lower layer of the water tank to complete the cycle.

[0027] As a further solution of the present invention, the summer refrigeration mode includes a cold storage condition, a cold release condition, and a direct supply and cold storage condition;

[0028] Cold storage condition: the indoor temperature reaches the set temperature, the heat pump does not reach the cooling set temperature, the water pump and the heat pump system are turned on, the end is closed, and the hot water on the upper layer of the water tank is pumped into the heat pump system through the water pump. After cooling, it flows back to the lower layer of the water tank through the pressure differential bypass valve to complete the cycle.

[0029] Cooling release condition: the indoor temperature has not reached the set temperature, the heat pump reaches the cooling set temperature, the water pump and the terminal are turned on, the heat pump system is turned off, and the water pump sends the cold water from the upper layer of the water tank to the terminal, which flows back to the lower layer of the water tank after completing the cold exchange with the building, completing the cycle.

[0030] Direct supply and cold storage working conditions: the indoor temperature has not reached the set temperature, the heat pump has not reached the cooling set temperature, the water pump, the heat pump system and the terminal are turned on, the water pump sends the hot water from the upper layer of the water tank into the heat pump system, and after cooling, it enters the terminal, and after completing the cold exchange with the building, it flows back to the lower layer of the water tank to complete the cycle.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. This system extracts energy from solar energy through photovoltaic modules and inverters, and uses photovoltaic electricity instead of city electricity, which can meet most of the electricity demand of household buildings throughout the year, greatly improving the economy of the system and reducing the electricity burden of the local power grid.

[0033] 2. This system replaces traditional refrigeration equipment or heating equipment with a heat pump system to absorb heat or cold from the air, which can achieve the function of heating household buildings in winter or cooling in summer, improving the thermal comfort of the building while reducing power consumption.

[0034] 3. This system uses energy storage batteries and energy storage water tanks to jointly store the excess heat and cold generated by photovoltaic electricity and heat pumps, thereby improving the system's photovoltaic absorption rate and stability while greatly reducing the system's energy storage costs.

[0035] 4. This system adds charging piles to meet the charging needs of household electric vehicles while further improving the system's photovoltaic absorption rate.

[0036] 5. This system has the functions of power supply, cooling, heating, electricity storage, cold storage, and heating storage, which can basically meet the building's cold, heat, and electricity loads throughout the year. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the system principle of the present invention;

[0038] Figure 2 A schematic diagram of the control logic of the winter heating mode of the present invention;

[0039] Figure 3 This is a control logic diagram of the summer cooling mode of the present invention.

[0040] In the figure: 1- photovoltaic module, 2- inverter, 3- mains power, 4- centralized controller, 5- energy storage battery, 6- heat pump + water tank system, 7- charging pile, 8- heat pump system, 9- water pump, 10- water tank, 11- safety valve, 12- differential pressure bypass valve. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0042] The serial numbers of the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0043] In the present invention, unless otherwise clearly specified and limited, a first feature is “on” a second feature.

[0044] "Below" means that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, "above", "above" and "above" the first feature of the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "below" and "below" the first feature of the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0045] Example 1

[0046] like Figure 1 As shown, a novel multi-energy coupled cooling, heating and power cogeneration system includes a photovoltaic module 1, an inverter 2, a mains electricity 3, a centralized controller 4, an energy storage battery 5, a heat pump coupled water tank system 6 and a charging pile 7;

[0047] The photovoltaic module 1 and the mains electricity 3 are electrically connected to the energy storage battery 5, the heat pump coupled water tank system 6, and the charging pile 7 through the inverter 2, wherein the energy storage battery 5 is connected to the inverter 2 alone, and the heat pump coupled water tank system 6 and the charging pile 7 are connected to the inverter 2 in parallel;

[0048] The centralized controller 4 is communicatively connected with the inverter 2 , the energy storage battery 5 , the heat pump coupled water tank system 6 , and the charging pile 7 , respectively.

[0049] The heat pump coupled water tank system 6 includes a heat pump circuit, one end of the heat pump circuit is provided with a terminal water supply side, the other end of the heat pump circuit is provided with a terminal water return side, a water tank 10, a water pump 9 and a heat pump unit 8 are sequentially provided on the heat pump circuit from the terminal water return side to the terminal water supply side, a bypass pipeline is provided between the terminal water return side and the terminal water supply side, a pressure differential bypass valve 12 is provided on the bypass pipeline, and a safety valve 11 is provided on the water tank 10.

[0050] Example 2

[0051] The heat pump coupled water tank system 6 includes controlling the inverter energy storage battery 5, the heat pump coupled water tank system 6 and the charging pile through the linkage of the centralized controller to realize the operation of the system in winter heating mode and summer cooling mode. The winter heating mode and summer cooling mode are adjusted in real time by judging the output power of the photovoltaic module, the start and stop status of the heat pump compressor, the power of the energy storage battery and the energy of the energy storage water tank to adjust the heat pump compressor frequency, return water temperature and charging power of the charging pile.

[0052] like Figure 3 As shown, the winter heating mode:

[0053] Insufficient radiation during the day: When the battery power is low and the power is between 0% and 80% of the total power, the heat pump system switches to ECO mode, the heating setting temperature is lowered, and the charging pile is set to non-rechargeable; when the battery power is high and the power is between 80% and 100% of the total power, when the compressor is operating normally, the heat pump system switches to standard mode, the heating setting temperature is raised within the range of 35℃ to 50℃, and the charging pile is set to non-rechargeable; when the battery power is high and the power is between 80% and 100% of the total power, when the compressor stops running, the heat pump system switches to standard mode, the heating setting temperature is raised within the range of 35℃ to 50℃, and the charging pile is set to low-power charging;

[0054] Sufficient radiation during the day: When the battery power is low and the power is between 0% and 80% of the total power, the heat pump system switches to standard mode, the heating setting temperature is increased within the range of 35℃ to 50℃, and the charging pile is set to non-charging; when the battery power is high and the power is between 80% and 100% of the total power, when the compressor is operating normally, the heat pump system switches to BOOST mode, the heating setting temperature is increased within the range of 35℃ to 50℃, and the charging pile is set to low-power charging; when the battery power is high and the power is between 80% and 100% of the total power, when the compressor stops running, the heat pump system switches to BOOST mode, the heating setting temperature is increased within the range of 35℃ to 50℃, and the charging pile is set to high-power charging;

[0055] At night: the heat pump system switches to ECO mode, the heating setting temperature is lowered within the range of 35℃~50℃, and the charging pile is set to non-charging; the ECO mode adopted is the economic mode, the main purpose of which is to reduce energy consumption and improve energy utilization efficiency by optimizing the operating parameters of the equipment, thereby achieving energy saving. In the heat pump, the ECO mode reduces power consumption while maintaining a certain degree of comfort and functionality.

[0056] In the periodic control process, if the state of the new multi-energy coupling system does not meet the judgment conditions, the settings of the previous cycle will continue to be maintained.

[0057] Example 3

[0058] like Figure 2 As shown, the summer cooling mode:

[0059] Insufficient radiation during the day: When the battery power is low and the power is between 0% and 80% of the total power, the heat pump system switches to ECO mode, the refrigeration setting temperature is increased within the range of 8℃ to 12℃, and the charging pile is set to non-rechargeable; when the battery power is high and the power is between 80% and 100% of the total power, when the compressor is operating normally, the heat pump system switches to standard mode, the refrigeration setting temperature is lowered within the range of 8℃ to 12℃, and the charging pile is set to non-rechargeable; when the battery power is high and the power is between 80% and 100% of the total power, when the compressor stops running, the heat pump system switches to standard mode, the refrigeration setting temperature is lowered within the range of 8℃ to 12℃, and the charging pile is set to low-power charging.

[0060] Sufficient radiation during the day: When the battery power is low and the power is between 0% and 80% of the total power, the heat pump system switches to standard mode, the cooling set temperature is lowered within the range of 8℃ to 12℃, and the charging pile is set to non-charging; when the battery power is high and the power is between 80% and 100% of the total power, when the compressor is operating normally, the heat pump system switches to BOOST mode, the cooling set temperature is lowered within the range of 8℃ to 12℃, and the charging pile is set to low-power charging; when the battery power is high and the power is between 80% and 100% of the total power, when the compressor stops running, the heat pump system switches to BOOST mode, the cooling set temperature is lowered within the range of 8℃ to 12℃, and the charging pile is set to high-power charging;

[0061] Among them, BOOST mode is acceleration mode. Acceleration mode provides maximum power or heating / cooling capacity in a short period of time to quickly reach the preset temperature or conditions. BOOST mode increases the system's output power or accelerates the workflow, helping users achieve a comfortable environment faster when rapid temperature control is required.

[0062] Nighttime: When the battery power is high, between 80% and 100% of the total power, the heat pump system switches to ECO mode, the cooling setting temperature is raised within the range of 8°C to 12°C, and the charging pile is set to non-charging;

[0063] The battery is low and the cooling capacity is high, the heat pump is turned off, and the charging pile is set to non-charging; the battery is low and the cooling capacity is low, the system is turned off, and the charging pile is set to non-charging;

[0064] In the periodic control process, if the state of the new multi-energy coupling system does not meet the judgment conditions, the settings of the previous cycle will continue to be maintained.

[0065] Example 4

[0066] The heat pump coupled water tank system also includes heat storage conditions, heat release conditions, direct supply and heat storage conditions, cold storage conditions, cold release conditions, and direct supply and cold storage conditions that are automatically switched according to actual conditions. The winter heating mode and the summer cooling mode automatically select different conditions for operation.

[0067] The winter heating mode includes heat storage mode, heat release mode and direct supply and heat storage mode;

[0068] Heat storage working condition: the indoor temperature reaches the set temperature. The indoor set temperature in winter is 18℃-30℃. The set temperature is adjusted according to the human body feeling of the indoor users. The heating set temperature of the heat pump in winter is 35℃-50℃. When the heat pump return water temperature reaches a certain value in this range, the heat pump will shut down. At the same time, the specific value of the heating set temperature varies according to the photovoltaic power and battery power. The heat pump has not reached the heating set temperature (35℃-50℃), the water pump and the heat pump system are turned on, and the end is closed; the cold water in the upper layer of the water tank is pumped into the heat pump system through the water pump, and after heating, it flows back to the lower layer of the water tank through the pressure differential bypass valve to complete the cycle;

[0069] Heat release condition: the indoor temperature has not reached the set temperature (18℃-30℃), and the heat pump has reached the heating set temperature (35℃-50℃). The water pump and the terminal are turned on, and the heat pump system is turned off; the water pump sends the hot water from the upper layer of the water tank to the terminal, and after completing the heat exchange with the building, it flows back to the lower layer of the water tank, completing the cycle;

[0070] Direct supply and heat storage working conditions: the indoor temperature does not reach the set temperature (18℃-30℃), and the heat pump does not reach the heating set temperature (35℃-50℃); the water pump, heat pump system and terminal are turned on; the water pump sends the cold water from the upper layer of the water tank into the heat pump system, which enters the terminal after heating, completes the heat exchange with the building, and flows back to the lower layer of the water tank to complete the cycle.

[0071] Example 5

[0072] The summer cooling mode includes a cold storage condition, a cold release condition, and a direct supply and cold storage condition;

[0073] Cold storage working condition: the indoor temperature reaches the set temperature (18℃-30℃). The indoor set temperature in summer is 18℃-30℃. The set temperature is adjusted according to the human body feeling of the indoor users. The cooling set temperature of the heat pump in summer is 8℃-12℃. When the heat pump return water temperature reaches a certain value in this range, the heat pump will shut down. At the same time, the specific value of the cooling set temperature varies according to the photovoltaic power and battery power. The heat pump has not reached the cooling set temperature (8℃-12℃), the water pump and the heat pump system are turned on, and the end is closed. The hot water on the upper layer of the water tank is pumped into the heat pump system through the water pump. After cooling, it flows back to the lower layer of the water tank through the pressure differential bypass valve to complete the cycle;

[0074] Cooling condition: the indoor temperature does not reach the set temperature (18℃-30℃), the heat pump reaches the cooling set temperature (8℃-12℃), the water pump and the terminal are turned on, the heat pump system is turned off, and the water pump sends the cold water from the upper layer of the water tank to the terminal, and after the cold water is exchanged with the building, it flows back to the lower layer of the water tank to complete the cycle;

[0075] Direct supply and cold storage working conditions: the indoor temperature does not reach the set temperature (18℃-30℃), the heat pump does not reach the cooling set temperature (8℃-12℃), the water pump, heat pump system and terminal are turned on, and the water pump sends the hot water from the upper layer of the water tank into the heat pump system. After cooling, it enters the terminal, completes the cold exchange with the building, and flows back to the lower layer of the water tank to complete the cycle.

[0076] In the periodic control process, if the state of the solar thermal storage charging system does not meet the judgment conditions, the settings of the previous cycle will continue to be maintained.

[0077] The electrical components mentioned in this article are all connected to an external main controller and 380V commercial power, and the main controller can be a conventional known device for control such as a computer.

[0078] In the description of this specification, the terms "connect", "install", "fix", "set", etc. are understood in a broad sense. For example, "connection" is a fixed connection or an indirect connection through an intermediate component without affecting the relationship between components and technical effects. It is also an integral connection or a partial connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention or invention can be understood according to specific circumstances. The above is only a preferred specific implementation of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, shall make equivalent replacements or changes according to the technical solution and inventive concept of the present invention, which shall be covered within the protection scope of the present invention.

Claims

1. A new type of multi-energy coupled cooling, heating and power system, characterized by: It includes a photovoltaic module (1), an inverter (2), a mains power supply (3), a centralized controller (4), an energy storage battery (5), a heat pump coupled water tank system (6) and a charging pile (7); The photovoltaic assembly (1) and the mains electricity (3) are electrically connected to the energy storage battery (5), the heat pump coupled water tank system (6), and the charging pile (7) through the inverter (2), respectively, wherein the energy storage battery (5) is connected to the inverter (2) alone, and the heat pump coupled water tank system (6) and the charging pile (7) are connected to the inverter (2) in parallel. The centralized controller (4) is respectively connected to the inverter (2), the energy storage battery (5), the heat pump coupled water tank system (6), and the charging pile (7) for communication.

2. According to claim 1, a novel multi-energy coupled cooling, heating and power cogeneration system is characterized by: The heat pump coupled water tank system (6) comprises a heat pump circuit, wherein one end of the heat pump circuit is provided with a terminal water supply side, and the other end of the heat pump circuit is provided with a terminal water return side. A water tank (10), a water pump (9) and a heat pump unit (8) are sequentially provided on the heat pump circuit from the terminal water return side to the terminal water supply side. A bypass pipeline is provided between the terminal water return side and the terminal water supply side, and a pressure differential bypass valve (12) is provided on the bypass pipeline. A safety valve (11) is provided on the water tank (10).

3. A control method for a novel multi-energy coupled cooling, heating and power cogeneration system, using the novel multi-energy coupled cooling, heating and power cogeneration system according to claim 2, characterized in that: The heat pump coupled water tank system (6) includes controlling the inverter energy storage battery (5), the heat pump coupled water tank system (6) and the charging pile through the linkage of the centralized controller to realize the operation of the system in the winter heating mode and the summer cooling mode. The winter heating mode and the summer cooling mode are adjusted in real time by judging the output power of the photovoltaic module, the start and stop status of the heat pump compressor, the power of the energy storage battery and the energy of the energy storage water tank to adjust the heat pump compressor frequency, the return water temperature and the charging power of the charging pile.

4. The control method of a novel multi-energy coupled cooling, heating and power system according to claim 3 is characterized by: The winter heating mode: Insufficient radiation during the day: When the battery power is low, the heat pump system switches to ECO mode, the heating setting temperature is lowered, and the charging pile is set to non-charging; when the battery power is high and the compressor is operating normally, the heat pump system switches to standard mode, the heating setting temperature is increased, and the charging pile is set to non-charging; when the battery power is high and the compressor stops running, the heat pump system switches to standard mode, the heating setting temperature is increased, and the charging pile is set to low-power charging; When the daytime radiation is sufficient: the battery power is low, the heat pump system switches to standard mode, the heating setting temperature is increased, and the charging pile is set to non-charging; when the battery power is high and the compressor is operating normally, the heat pump system switches to BOOST mode, the heating setting temperature is increased, and the charging pile is set to low-power charging; when the battery power is high and the compressor stops running, the heat pump system switches to BOOST mode, the heating setting temperature is increased, and the charging pile is set to high-power charging; At night: the heat pump system switches to ECO mode, the heating setting temperature is lowered, and the charging station is set to non-charging; In the periodic control process, if the state of the new multi-energy coupling system does not meet the judgment conditions, the settings of the previous cycle will continue to be maintained.

5. The control method of a novel multi-energy coupled cooling, heating and power system according to claim 3 is characterized by: The summer cooling mode: Insufficient radiation during the day: When the battery power is low, the heat pump system switches to ECO mode, the refrigeration setting temperature is increased, and the charging pile is set to non-rechargeable; when the battery power is high and the compressor is operating normally, the heat pump system switches to standard mode, the refrigeration setting temperature is lowered, and the charging pile is set to non-rechargeable; when the battery power is high and the compressor stops running, the heat pump system switches to standard mode, the refrigeration setting temperature is lowered, and the charging pile is set to low-power charging. When the daytime radiation is sufficient: the battery power is low, the heat pump system switches to standard mode, the cooling setting temperature is lowered, and the charging pile is set to non-charging; when the battery power is high and the compressor is operating normally, the heat pump system switches to BOOST mode, the cooling setting temperature is lowered, and the charging pile is set to low-power charging; when the battery power is high and the compressor stops running, the heat pump system switches to BOOST mode, the cooling setting temperature is lowered, and the charging pile is set to high-power charging; Nighttime: When the battery power is high, the heat pump system switches to ECO mode, the cooling setting temperature is increased, and the charging pile is set to non-rechargeable; When the battery power is low and the cooling capacity is high, the heat pump is turned off, and the charging pile is set to non-rechargeable; When the battery power is low and the cooling capacity is low, the system is turned off, and the charging pile is set to non-rechargeable; In the periodic control process, if the state of the new multi-energy coupling system does not meet the judgment conditions, the settings of the previous cycle will continue to be maintained.

6. A control method for a novel multi-energy coupled cooling, heating and power cogeneration system according to claim 4 or 5, characterized in that: The heat pump coupled water tank system also includes heat storage conditions, heat release conditions, direct supply and heat storage conditions, cold storage conditions, cold release conditions, and direct supply and cold storage conditions that are automatically switched according to actual conditions. The winter heating mode and the summer cooling mode automatically select different conditions for operation according to the judgment conditions.

7. The control method of a novel multi-energy coupled cooling, heating and power system according to claim 6 is characterized by: The winter heating mode includes heat storage mode, heat release mode and direct supply and heat storage mode; Heat storage working condition: the indoor temperature reaches the set temperature, the heat pump does not reach the heating set temperature, the water pump and the heat pump system are turned on, and the terminal is closed; the cold water in the upper layer of the water tank is pumped into the heat pump system through the water pump, and after being heated, it flows back to the lower layer of the water tank through the pressure difference bypass valve to complete the cycle; Heat release condition: the indoor temperature has not reached the set temperature, and the heat pump has reached the heating set temperature. The water pump and the terminal are turned on, and the heat pump system is turned off; the water pump sends the hot water from the upper layer of the water tank to the terminal, and after completing the heat exchange with the building, it flows back to the lower layer of the water tank, completing the cycle; Direct supply and heat storage working conditions: the indoor temperature has not reached the set temperature, and the heat pump has not reached the heating set temperature; the water pump, heat pump system and terminal are turned on; the water pump sends the cold water from the upper layer of the water tank into the heat pump system, which enters the terminal after heating, completes the heat exchange with the building, and flows back to the lower layer of the water tank to complete the cycle.

8. The control method of a novel multi-energy coupled cooling, heating and power system according to claim 6 is characterized by: The summer cooling mode includes a cold storage condition, a cold release condition, and a direct supply and cold storage condition; Cold storage working condition: the indoor temperature reaches the set temperature, the heat pump does not reach the cooling set temperature, the water pump and the heat pump system are turned on, the terminal is closed, and the hot water on the upper layer of the water tank is pumped into the heat pump system through the water pump. After cooling, it flows back to the lower layer of the water tank through the pressure differential bypass valve to complete the cycle; Cooling release condition: the indoor temperature has not reached the set temperature, the heat pump reaches the cooling set temperature, the water pump and the terminal are turned on, the heat pump system is turned off, and the water pump sends the cold water from the upper layer of the water tank to the terminal, and after the cold exchange with the building is completed, it flows back to the lower layer of the water tank to complete the cycle; Direct supply and cold storage working conditions: the indoor temperature has not reached the set temperature, the heat pump has not reached the cooling set temperature, the water pump, the heat pump system and the terminal are turned on, the water pump sends the hot water from the upper layer of the water tank into the heat pump system, and after cooling, it enters the terminal, and after completing the cold exchange with the building, it flows back to the lower layer of the water tank to complete the cycle.

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