Household light heat storage and charging system and control method thereof

Abstract

The invention discloses a household optical heat storage charging system and a control method thereof. The household optical heat storage charging system comprises a photovoltaic module, an inverter, an energy storage battery, a load and a mains supply interface, the load comprises a heat pump, a charging pile, a wireless router, an intelligent screen and other loads; the photovoltaic module, the energy storage battery, the load, the mains supply interface, the wireless router and the smart screen are electrically connected to the inverter; the inverter, the heat pump, the charging pile and the smart screen are all provided with wireless communication modules, and are accessed to a local area network created by the wireless router in a wireless communication mode to realize data transmission; by integrating photovoltaic, energy storage, heat pump and charging technologies, efficient conversion, storage and multi-scene application of solar energy are achieved, an effective power distribution method is provided for a light storage and heat charging system, the photovoltaic consumption rate is increased, and green transformation of an energy structure is promoted.

Description

Technical Field

[0001] The present invention relates to the field of photovoltaic energy storage technology, and in particular to a household photovoltaic heat storage charging system and a control method thereof. Background Art

[0002] At a time when the world is paying more and more attention to clean energy and energy conservation and emission reduction, household solar thermal storage charging technology has emerged. At present, the mainstream solar thermal storage charging application mode in the industry focuses on the strategy of "self-generation and self-use, surplus power to the grid", that is, the photovoltaic system's self-generated power is used to supply local loads first, and the shortfall is supplemented by the city power. However, under the above mode, the matching of photovoltaic power generation, energy storage battery state of charge (SOC) and load power demand is still insufficient, and the system operation cost is high. Summary of the invention

[0003] The technical problem to be solved by the present invention is to address the deficiencies of the prior art and propose a household solar thermal storage charging system and control method that fully utilizes photovoltaic power generation and reduces system operating costs. The technical problem to be solved by the present invention is achieved through the following technical solutions. A household solar thermal storage charging system is characterized by: Including photovoltaic modules, inverters, energy storage batteries, loads, and mains interfaces; The loads include heat pumps, charging piles, wireless routers, smart screens and other loads; The photovoltaic modules, energy storage batteries, loads, mains interfaces, wireless routers and smart screens are electrically connected to the inverter; The inverter, heat pump, charging pile, and smart screen are all equipped with wireless communication modules, which are connected to the local area network created by the wireless router through wireless communication and realize data transmission; The smart screen is responsible for collecting data related to the inverter, heat pump, and charging pile, and controlling the inverter, heat pump, and charging pile; The heat pump uses a variable frequency compressor. When the heat pump is running the cooling and heating functions, it has three modes: energy saving, standard, and strong, and the power consumption increases in turn; when the heat pump is running the hot water function, it has two modes: standard and fast heating. In the fast heating mode, the heat pump starts electric heating on the basis of running in the standard mode; The charging power of the charging pile can be adjusted through the smart screen.

[0004] The technical problem to be solved by the present invention can be further achieved by the following technical solution: when the heat pump has a hot water function, a hot water tank is provided, an electric heating device is installed in the hot water tank, and the heat pump is uniformly controlled.

[0005] A control method using the above household solar thermal storage charging system is characterized by: The smart screen obtains the real-time power generation power P1 of the photovoltaic module, the real-time power consumption P2 of the load, and the state of charge (SOC) of the energy storage battery through the inverter. The maximum input power of the heat pump in the strong mode of cooling is P11, the maximum input power of the heat pump in the standard mode of cooling is P12, the maximum input power of the heat pump in the strong mode of heating is P13, the maximum input power of the heat pump in the standard mode of heating is P14, and the maximum input power of the heat pump in the fast heating mode of heating water is P15; The household solar heat storage and charging system has intelligent mode and standard mode, and the mode is set through the smart screen; in intelligent mode, photovoltaic power generation is used first, and the load is powered by the inverter. If photovoltaic power generation is insufficient, the energy storage battery is used to supplement it. If the energy storage battery is insufficient, the mains electricity is used to supplement it; in intelligent mode, the charging pile charges the electric vehicle with variable power; in standard mode, the inverter operates according to the mode set by the smart screen. When the heat pump operates the cooling, heating and hot water functions, the heat pump operates according to the mode set by the smart screen, and the charging pile charges the electric vehicle according to the power set by the smart screen.

[0006] The technical problem to be solved by the present invention can be further achieved by the following technical solutions: When the heat pump and the charging pile stop running, the real-time power consumption P2 of the load at a certain moment is recorded as the load power consumption P2', and the load power consumption P2' remains unchanged before the heat pump and the charging pile are switched from the running state to the stopped state next time; In the intelligent mode, when the heat pump runs the cooling function, when P1≥P2'+P11, the heat pump runs in the strong mode. If the charging pile has a charging demand, the charging power of the charging pile is adjusted to P1-P2'-P11; when P1≥P2'+P12 and P1<P2'+P11, the heat pump runs in the standard mode. If the charging pile has a charging demand, the charging power of the charging pile is adjusted to P1-P2'-P12; when P1<P2'+P12 and the energy storage battery SOC≥the set value a, the heat pump runs in the standard mode, and the charging pile stops charging the electric vehicle; when P1<P2'+P12 and the energy storage battery SOC<the set value a, the heat pump runs in the energy-saving mode, and the charging pile stops charging the electric vehicle; In the intelligent mode, when the heat pump runs the heating function, when P1≥P2'+P13, the heat pump runs in the strong mode. If the charging pile has a charging demand, the charging power of the charging pile is adjusted to P1-P2'-P13; when P1≥P2'+P14 and P1<P2'+P13, the heat pump runs in the standard mode. If the charging pile has a charging demand, the charging power of the charging pile is adjusted to P1-P2'-P14; when P1<P2'+P14 and the energy storage battery SOC≥the set value a, the heat pump runs in the standard mode, and the charging pile stops charging the electric vehicle; when P1<P2'+P14 and the energy storage battery SOC<the set value a, the heat pump runs in the energy-saving mode, and the charging pile stops charging the electric vehicle; In intelligent mode, when the heat pump runs the hot water function, when P1≥P2'+P15, the heat pump runs in rapid heating mode. If the charging pile has charging demand, the charging power of the charging pile is adjusted to P1-P2'-P15; when P1<P2'+P15, the heat pump runs in standard mode and the charging pile stops charging the electric vehicle.

[0007] Compared with the prior art, the present invention provides a household solar heat storage and charging system based on wireless LAN communication to ensure the security of data transmission, and at the same time proposes a control method for the household solar heat storage and charging system to make full use of photovoltaic power generation, reduce the use of photovoltaic power generation grid-connected and city electricity, and reduce the system operation cost. The technology of the present invention integrates photovoltaic, energy storage, heat pump and charging technology to achieve efficient conversion, storage and multi-scenario application of solar energy. The present invention matches the power consumption of heat pumps and charging piles according to the difference between the real-time photovoltaic power generation power and the load power consumption in the previous period, and more accurately adjusts the heat pump operation mode and the charging power of the charging pile, providing an effective power distribution method for the solar heat storage and charging system, and improving the photovoltaic absorption rate. It promotes the green transformation of the energy structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a block diagram of the household solar thermal storage system; Figure 2 This is the system operation principle diagram when the heat pump is cooling in intelligent mode; Figure 3 This is the system operation principle diagram when the heat pump is heating in intelligent mode; Figure 4 This is the system operation schematic diagram when the heat pump is producing hot water in intelligent mode. DETAILED DESCRIPTION

[0009] The specific technical solutions of the present invention are further described below. To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer and to facilitate those skilled in the art to further understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them, and do not constitute a limitation on the rights thereof. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0010] A household solar thermal storage charging system, comprising: a photovoltaic module, an inverter, an energy storage battery, a load, and a mains interface; The loads include heat pumps, charging piles, wireless routers, smart screens and other loads; the charging piles can be electric vehicle charging piles, electric bicycle charging piles and other devices used for charging.

[0011] The photovoltaic modules, energy storage batteries, loads, mains interfaces, wireless routers and smart screens are electrically connected to the inverter; The inverter, heat pump, charging pile, and smart screen are equipped with wireless communication modules, which access the local area network created by the wireless router through wireless communication and realize data transmission; The smart screen is responsible for collecting data related to the inverter, heat pump, and charging pile, and controlling the inverter, heat pump, and charging pile; Heat pumps can have three functions: cooling, heating, and hot water, or some of the three functions; When the heat pump uses the hot water function, it is equipped with a hot water tank, which is electrically heated and controlled uniformly by the heat pump. The heat pump uses a variable frequency compressor. When the heat pump is running the cooling and heating functions, it has three modes: energy saving, standard, and strong, and the power consumption increases in turn; when the heat pump is running the hot water function, it has two modes: standard and fast heating. In the fast heating mode, the heat pump starts electric heating on the basis of running in the standard mode; The charging power of the charging pile can be adjusted through the smart screen; A control method for a household solar thermal storage charging system, applied to a household solar thermal storage charging system: The smart screen obtains the real-time power generation power P1 of the photovoltaic module, the real-time power consumption P2 of the load, and the state of charge (SOC) of the energy storage battery through the inverter. The maximum input power of the heat pump in the strong mode of cooling is P11, the maximum input power of the heat pump in the standard mode of cooling is P12, the maximum input power of the heat pump in the strong mode of heating is P13, the maximum input power of the heat pump in the standard mode of heating is P14, and the maximum input power of the heat pump in the fast heating mode of heating water is P15; The household solar heat storage and charging system has intelligent mode and standard mode, and the mode can be set through the smart screen; in intelligent mode, photovoltaic power generation is used first, and the load is powered by the inverter. If photovoltaic power generation is insufficient, the energy storage battery is used to supplement it. If the energy storage battery is insufficient, the mains electricity is used to supplement it; in intelligent mode, the charging pile charges the electric vehicle with variable power; in standard mode, the inverter operates according to the mode set by the smart screen. When the heat pump operates the cooling, heating, and hot water functions, the heat pump operates according to the mode set by the smart screen, and the charging pile charges the electric vehicle according to the power set by the smart screen.

[0012] A control method for a household solar thermal storage charging system, applied to a household solar thermal storage charging system: When the heat pump and the charging pile stop running, the real-time power consumption P2 of the load at a certain moment is recorded as the load power consumption P2', and the load power consumption P2' remains unchanged before the heat pump and the charging pile are switched from the running state to the stopped state next time; In the intelligent mode, when the heat pump is running the cooling function, when P1≥P2'+P11, the heat pump runs in the strong mode. If the charging pile has a charging demand, the charging power of the charging pile is adjusted to a value close to P1-P2'-P11; when P1≥P2'+P12 and P1<P2'+P11, the heat pump runs in the standard mode. If the charging pile has a charging demand, the charging power of the charging pile is adjusted to a value close to P1-P2'-P12; when P1<P2'+P12 and the energy storage battery SOC≥the set value a, the heat pump runs in the standard mode, and the charging pile stops charging the electric vehicle; when P1<P2'+P12 and the energy storage battery SOC<the set value a, the heat pump runs in the energy-saving mode, and the charging pile stops charging the electric vehicle; In the intelligent mode, when the heat pump is running the heating function, when P1≥P2'+P13, the heat pump runs in the strong mode. If the charging pile has a charging demand, the charging power of the charging pile is adjusted to a value close to P1-P2'-P13; when P1≥P2'+P14 and P1<P2'+P13, the heat pump runs in the standard mode. If the charging pile has a charging demand, the charging power of the charging pile is adjusted to a value close to P1-P2'-P14; when P1<P2'+P14 and the energy storage battery SOC≥the set value a, the heat pump runs in the standard mode, and the charging pile stops charging the electric vehicle; when P1<P2'+P14 and the energy storage battery SOC<the set value a, the heat pump runs in the energy-saving mode, and the charging pile stops charging the electric vehicle; In intelligent mode, when the heat pump runs the hot water function, when P1≥P2'+P15, the heat pump runs in rapid heating mode. If the charging pile has charging demand, the charging power of the charging pile is adjusted to a value close to P1-P2'-P15; when P1<P2'+P15, the heat pump runs in standard mode and the charging pile stops charging the electric vehicle.

Claims

1. A household solar thermal storage charging system, characterized by: Including photovoltaic modules, inverters, energy storage batteries, loads, and mains interfaces; The loads include heat pumps, charging piles, wireless routers, smart screens and other loads; The photovoltaic modules, energy storage batteries, loads, mains interfaces, wireless routers and smart screens are electrically connected to the inverter; The inverter, heat pump, charging pile, and smart screen are all equipped with wireless communication modules, which are connected to the local area network created by the wireless router through wireless communication and realize data transmission; The smart screen is responsible for collecting data related to the inverter, heat pump, and charging pile, and controlling the inverter, heat pump, and charging pile; The heat pump uses a variable frequency compressor. When the heat pump is running the cooling and heating functions, it has three modes: energy saving, standard, and strong, and the power consumption increases in turn; when the heat pump is running the hot water function, it has two modes: standard and fast heating. In the fast heating mode, the heat pump starts electric heating on the basis of running in the standard mode; The charging power of the charging pile can be adjusted through the smart screen.

2. The household solar thermal storage charging system according to claim 1 is characterized in that: When the heat pump has a hot water function, a hot water tank is provided, in which an electric heating device is installed, which is centrally controlled by the heat pump.

3. A control method using the household solar thermal storage charging system according to claim 1, characterized in that: The smart screen obtains the real-time power generation power P1 of the photovoltaic module, the real-time power consumption P2 of the load, and the state of charge (SOC) of the energy storage battery through the inverter. The maximum input power of the heat pump in the strong mode of cooling is P11, the maximum input power of the heat pump in the standard mode of cooling is P12, the maximum input power of the heat pump in the strong mode of heating is P13, the maximum input power of the heat pump in the standard mode of heating is P14, and the maximum input power of the heat pump in the fast heating mode of heating water is P15; The household solar heat storage and charging system has intelligent mode and standard mode, and the mode is set through the smart screen; in intelligent mode, photovoltaic power generation is used first, and the load is powered by the inverter. If photovoltaic power generation is insufficient, the energy storage battery is used to supplement it. If the energy storage battery is insufficient, the mains electricity is used to supplement it; in intelligent mode, the charging pile charges the electric vehicle with variable power; in standard mode, the inverter operates according to the mode set by the smart screen. When the heat pump operates the cooling, heating and hot water functions, the heat pump operates according to the mode set by the smart screen, and the charging pile charges the electric vehicle according to the power set by the smart screen.

4. The control method of the household solar thermal storage charging system according to claim 3 is characterized in that: When the heat pump and the charging pile stop running, the real-time power consumption P2 of the load at a certain moment is recorded as the load power consumption P2', and the load power consumption P2' remains unchanged before the heat pump and the charging pile are switched from the running state to the stopped state next time; In the intelligent mode, when the heat pump runs the cooling function, when P1≥P2'+P11, the heat pump runs in the strong mode. If the charging pile has a charging demand, the charging power of the charging pile is adjusted to P1-P2'-P11; when P1≥P2'+P12 and P1<P2'+P11, the heat pump runs in the standard mode. If the charging pile has a charging demand, the charging power of the charging pile is adjusted to P1-P2'-P12; when P1<P2'+P12 and the energy storage battery SOC≥the set value a, the heat pump runs in the standard mode, and the charging pile stops charging the electric vehicle; when P1<P2'+P12 and the energy storage battery SOC<the set value a, the heat pump runs in the energy-saving mode, and the charging pile stops charging the electric vehicle; In the intelligent mode, when the heat pump runs the heating function, when P1≥P2'+P13, the heat pump runs in the strong mode. If the charging pile has a charging demand, the charging power of the charging pile is adjusted to P1-P2'-P13; when P1≥P2'+P14 and P1<P2'+P13, the heat pump runs in the standard mode. If the charging pile has a charging demand, the charging power of the charging pile is adjusted to P1-P2'-P14; when P1<P2'+P14 and the energy storage battery SOC≥the set value a, the heat pump runs in the standard mode, and the charging pile stops charging the electric vehicle; when P1<P2'+P14 and the energy storage battery SOC<the set value a, the heat pump runs in the energy-saving mode, and the charging pile stops charging the electric vehicle; In intelligent mode, when the heat pump runs the hot water function, when P1≥P2'+P15, the heat pump runs in rapid heating mode. If the charging pile has charging demand, the charging power of the charging pile is adjusted to P1-P2'-P15; when P1<P2'+P15, the heat pump runs in standard mode and the charging pile stops charging the electric vehicle.

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